CN120347364B

CN120347364B - Ultrasonic welding head and wear detection method, battery cell, battery device and power device

Info

Publication number: CN120347364B
Application number: CN202510842960.0A
Authority: CN
Inventors: 袁安; 黄忠宝; 吴凯
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2025-06-23
Filing date: 2025-06-23
Publication date: 2025-09-16
Anticipated expiration: 2045-06-23
Also published as: CN120347364A

Abstract

The present invention discloses an ultrasonic welding head and a wear detection method, a battery cell, a battery device and an electrical device, belonging to the field of battery technology. The ultrasonic welding head includes: a welding head body, a first welding tooth structure and a second welding tooth structure. The welding head body has a welding surface, the first welding tooth structure is protruding from the welding surface, the second welding tooth structure is protruding from the side of the first welding tooth structure away from the welding surface, and the second welding tooth structure includes at least one second welding tooth, and the second welding tooth extends in a long strip shape in the extension direction of the welding surface. According to an embodiment of the present invention, the ultrasonic welding head can perform multi-stage pressing on multi-layer foils by adding a second welding tooth structure on the side of the first welding tooth structure of the ultrasonic welding head away from the welding surface, thereby enhancing the compaction effect of the first welding tooth structure and the second welding tooth structure on the welding of the multi-layer foils, reducing the gap between the multi-layer foils, and helping to improve the welding quality of subsequent welding processes.

Description

Ultrasonic welding head, abrasion detection method, battery unit, battery device and power utilization device

Technical Field

The invention relates to the technical field of batteries, in particular to an ultrasonic welding head, a wear detection method, a battery cell, a battery device and an electricity utilization device.

Background

In the related art, in order to further increase the energy density of the battery cell, a transfer sheet for connecting the tab with the electrode terminal is omitted, and the tab of the electrode assembly is directly connected with the electrode terminal on the housing of the battery cell instead of through the transfer connection. The electrode assembly tab and electrode terminal are connected by pre-welding the multi-layer tab by ultrasonic wave to form an integral tab, and then connecting the tab and electrode terminal by laser welding.

However, in the related art, welding defects such as explosion points and collapse are easy to generate in the process of welding the tab and the electrode terminal by laser, and more welding defects such as cracks are easy to generate on the tab, so that the welding quality of a laser welding procedure is poor, and the service stability of the battery is affected. Therefore, how to improve the quality of laser welding of the tab and the electrode terminal and improve the service stability of the battery is a technical problem to be solved urgently.

Disclosure of Invention

The invention provides an ultrasonic welding head, a wear detection method, a battery unit, a battery device and an electric device, wherein when workpieces of multi-layer foil materials such as tabs and the like are welded by the ultrasonic welding head, the workpieces can be compacted, gaps among the multi-layer foil materials are reduced, and therefore welding quality of subsequent welding procedures is improved.

In a first aspect, the invention provides an ultrasonic welding head, which comprises a welding head main body, a first welding tooth structure and a second welding tooth structure, wherein the welding head main body is provided with a welding surface, the first welding tooth structure is convexly arranged on the welding surface, the second welding tooth structure is convexly arranged on one side, far away from the welding surface, of the first welding tooth structure, the second welding tooth structure comprises at least one second welding tooth, and the second welding tooth extends in a strip shape in the extending direction of the welding surface.

In the technical scheme, the second welding tooth structure is added on one side, far away from the welding surface, of the first welding tooth structure of the ultrasonic welding head, so that multistage pier pressing can be conducted on the multilayer foil, the compaction effect of the whole of the first welding tooth structure and the second welding tooth structure on the multilayer foil can be enhanced, gaps between the multilayer foil can be reduced, welding quality of a subsequent welding process can be improved, for example, when the subsequent welding process is a laser welding process, welding defect problems such as explosion points and collapse generated in the laser welding process can be reduced, welding cracks can be reduced, and due to the fact that gaps between the multilayer foil are reduced, the heat dissipation uniformity of a laser welding joint can be improved, the problem of foil cracking caused by overlarge local stress of the foil can be improved, and by setting the second welding tooth structure to be elongated extending in the extending direction of the welding surface, the contact length of the second welding tooth structure and the surface of the multilayer foil, the compaction effect on the multilayer foil can be further enhanced, the compaction effect between the multilayer foil can be further reduced, the gaps between the multilayer foil can be improved further, the welding quality of the multilayer foil can be improved, the welding terminal can be improved, the welding quality of the laser welding terminal can be improved, the corresponding to the welding quality of the laser welding terminal can be improved, the welding quality of the laser welding terminal can be improved, and the welding terminal can be better, and the welding quality of the welding terminal can be welded at the corresponding to the position of the electrode can be welded at the position of the laser welding terminal, and the welding terminal can be better, and the welding quality of the welding terminal can be better corresponding to the welding quality of the welding terminal, and the welding terminal can be welded.

In some embodiments, the two ends of the second welding tooth in the length direction extend to the two opposite ends of the welding surface respectively.

In the technical scheme, the two ends of the second welding tooth in the length direction are respectively extended to the two opposite ends of the welding surface, so that the length of the second welding tooth can be increased, when ultrasonic welding is carried out, the contact length between the second welding tooth structure and the surface of the multi-layer foil material is longer, the compaction effect of the second welding tooth structure on the multi-layer foil material is further enhanced, and the length of the second welding tooth is longer, so that when the welding position corresponding to the second welding tooth is subjected to laser welding in the subsequent welding process, the length of the laser welding is longer, the reliability and the stability of the subsequent welding connection are improved, for example, after the ultrasonic welding head is used for welding the multi-layer foil material of the electrode lug, when the subsequent welding process is the laser welding process, the laser welding seam between the electrode lug and the electrode terminal is longer, and the stability and the reliability of the welding connection of the electrode lug and the electrode terminal are facilitated to be improved.

In some embodiments, the second weld tooth extends along a length of the weld face.

In the above technical scheme, the second welding teeth extend along the length direction of the welding surface, so that the space in the length direction of the welding surface can be utilized, the length of the second welding teeth can be increased, the contact length between the second welding tooth structure and the surface of the multilayer foil material is longer when ultrasonic welding is performed, and the compaction effect of the second welding tooth structure on the multilayer foil material is enhanced.

In some embodiments, the second weld tooth extends in a width direction of the welding face.

In the above technical scheme, the second welding teeth extend along the width direction of the welding surface, so that the space in the width direction of the welding surface can be utilized, the arrangement quantity of the second welding teeth is increased, the contact area between the second welding tooth structure and the surface of the multilayer foil is large when ultrasonic welding is performed, and the compaction effect of the second welding tooth structure on the multilayer foil is enhanced.

In some embodiments, the second weld tooth extends along a straight line.

In the technical scheme, the second welding teeth extending along the straight line are arranged, so that the second welding teeth are simple in result and convenient to machine and shape, and the welding marks corresponding to the second welding teeth extending along the straight line also extend along the straight line basically, so that in the subsequent welding process, welding connection can be carried out along the straight line, and the subsequent welding process is simpler in design.

In some embodiments, the second welding teeth are a plurality of welding teeth arranged at intervals.

According to the technical scheme, the plurality of second welding teeth are arranged at intervals, and can compact a plurality of different positions of the plurality of multi-layer foil, so that gaps of the plurality of different positions of the multi-layer foil can be reduced, and the quality of a subsequent welding process is improved.

In some embodiments, a plurality of the second teeth are disposed side by side along a width direction of the second teeth.

In the above technical scheme, through setting up a plurality of second welding teeth side by side along the width direction of second welding teeth, can increase the area of contact of second welding tooth structure and multilayer foil surface, strengthen the compaction effect to between the multilayer foil to can make the clearance reduction in the different positions of the width direction of the second welding teeth of multilayer foil, help promoting follow-up welding process quality.

In some embodiments, the second welding teeth extend along the length direction of the welding surface, and the plurality of second welding teeth are arranged along the width direction of the welding surface.

In the above technical scheme, through extending the length direction of second welding tooth along the welding face, can make full use of the length direction's of welding face space for the extension length of second welding tooth is longer, and makes a plurality of second welding teeth arrange along the width direction of welding face, and the distribution of a plurality of second welding teeth is comparatively even, can increase the contact length and the area of contact of second welding tooth structure and work piece surface, makes second welding tooth structure and work piece surface contact comparatively even, makes the inside heat more evenly distributed of work piece, can strengthen the compaction effect to the work piece surface.

In some embodiments, in the arrangement direction of the plurality of second welding teeth, a distance between two adjacent second welding teeth is d1, and a maximum width of the second welding teeth is W2, wherein W2< d1.

In the above technical scheme, the maximum width W2 of the second welding teeth is smaller than the distance d1 between two adjacent second welding teeth, so that the width of the second welding teeth is smaller, and under a certain welding pressure, the second welding teeth can generate larger pressure to the multilayer foil, so that the compaction effect of the second welding teeth on the multilayer foil is further enhanced.

In some embodiments, the ratio of W2 to d1 ranges from 0.2 to 0.8.

In the above technical scheme, the ratio of the maximum width W2 of the second welding teeth to the distance d1 between two adjacent second welding teeth is set within the range of 0.2-0.8, so that the contact area between the second welding tooth structure and the surface of the multilayer foil is larger while larger pressure can be generated on the multilayer foil under a certain welding pressure, and the compaction effect on the multilayer foil is enhanced.

In some embodiments, in the arrangement direction of the plurality of second welding teeth, the minimum distance between the second welding teeth and the edge of the welding surface is d2, and the maximum width of the second welding teeth is W2, d2> W2.

In the above technical scheme, the minimum distance d2 between the second welding tooth and the edge of the welding surface is greater than the maximum width W2 of the second welding tooth, so that the second welding tooth has a certain distance from the edge of the welding surface, the second welding tooth can better compact the multi-layer foil, and the compacting effect on the multi-layer foil is enhanced.

In some embodiments, the cross-section of the second tooth is a second cross-section having a taper that extends to a side of the second tooth distal from the welding face, the taper decreasing in width in a direction from the welding face to the second tooth.

In the technical scheme, the width of the tapered part of the second welding tooth is gradually reduced in the direction from the welding surface to the second welding tooth, so that the second welding tooth has larger pressure on the multilayer foil under certain welding pressure, and the compaction effect of the second welding tooth on the multilayer foil is enhanced.

In some embodiments, at least a portion of the second weld teeth have the same cross-sectional area in the direction of extension of the second weld teeth.

In the technical scheme, at least part of the cross sectional areas of the second welding teeth in the extending direction are the same, so that the compaction of the second welding teeth on the multi-layer foil in the extending direction can be kept uniform, the compaction effect of the second welding teeth on the multi-layer foil is enhanced, the width dimension of the welding marks corresponding to the second welding teeth in the extending direction is uniform, and the welding connection operation of the subsequent welding process at the welding marks corresponding to the second welding teeth is facilitated.

In some embodiments, the second tooth is arcuate, circular or elliptical in cross-section.

In the technical scheme, the cross section of the second welding tooth is in the shape of an arc, a circle or an ellipse, and the like, so that the foil can not be scratched easily when the surface of the second welding tooth is contacted with the multilayer foil.

In some embodiments, the second weld tooth includes a tooth portion.

In the technical scheme, the second welding teeth comprise the tooth parts, so that the second welding teeth are simple in structure and convenient to machine and shape.

In some embodiments, the second welding tooth includes a plurality of teeth, a surface of the teeth far away from one side of the welding surface forms a tooth end surface, the plurality of teeth are respectively a first tooth to an mth tooth sequentially arranged along a protruding direction of the second welding tooth, the nth tooth is arranged on the tooth end surface of the (n-1) th tooth, and a projection of the nth tooth on the tooth end surface of the (n-1) th tooth is positioned in the tooth end surface of the (n-1) th tooth, wherein n is equal to or less than 2 and equal to m.

In the above technical solution, the second welding teeth are set to include a plurality of teeth, and the plurality of teeth are respectively a first tooth to an mth tooth which are sequentially set along the protruding direction of the second welding teeth, the nth tooth is disposed on the tooth end face of the (n-1) th tooth, the projection of the nth tooth on the tooth end face of the (n-1) th tooth is located in the tooth end face of the (n-1) th tooth, so that the part, on the side far away from the welding surface, of the (n-1) th tooth, of the tooth end face exceeds the nth tooth can be formed into a welding pier pressing surface, when the ultrasonic welding head welds the multilayer foil, each tooth can tamp and pier-press the multilayer foil, so as to realize multilayer pier pressing and ramming of the welding material on the welding material, further enhance the compacting effect between the multilayer foil, reduce the gap between the multilayer foil better, reduce the welding energy loss caused by overlarge interlayer gap of the multilayer foil, and facilitate the subsequent welding process, and improve the subsequent welding quality.

In some embodiments, the first tooth structure includes a first tooth, a side surface of the first tooth away from the welding surface forms a tooth end surface, the second tooth is disposed on the tooth end surface, and a projection of the second tooth on the tooth end surface is located in the tooth end surface.

In the technical scheme, the second welding teeth are arranged in the welding tooth end faces of the first welding teeth, so that obvious boundaries are formed between the second welding teeth and the first welding teeth, the first welding teeth and the second welding teeth are more favorable for forming a multi-stage welding tooth structure, the multi-stage upsetting is more favorable for realizing multi-stage upsetting on the multi-layer foil, and the compaction effect is better.

In some embodiments, in a protruding direction of the first welding tooth relative to the welding surface, a tooth height of the first welding tooth is h1, a tooth height of the second welding tooth is h2, and a ratio of h2 to h1 ranges from 0.3 to 0.8.

In the technical scheme, the ratio of the tooth height h2 of the second welding tooth to the tooth height h1 of the first welding tooth is not smaller than 0.3, so that the second welding tooth has higher tooth height, the second welding tooth has better compaction effect on the multilayer foil, and the ratio of the tooth height h2 of the second welding tooth to the tooth height h1 of the first welding tooth is not larger than 0.8, so that the welding effect of the first welding tooth cannot be influenced due to the higher tooth height of the second welding tooth, the contact of the first welding tooth with the multilayer foil can be better prevented from being influenced due to the higher tooth height of the second welding tooth, the multilayer foil can be welded by the ultrasonic welding head, the first welding tooth and the second welding tooth can be fully contacted with the multilayer foil, the contact area of the first welding tooth and the contact area of the second welding tooth with the multilayer foil are larger, and the compaction effect on the multilayer foil can be improved.

In some embodiments, in a protruding direction of the first welding tooth relative to the welding surface, a tooth height of the first welding tooth is h1, and a value range of h1 is 0.2 mm-0.6 mm.

In the technical scheme, the tooth height h2 of the second welding tooth is not smaller than 0.2mm, so that the second welding tooth has higher tooth height, the second welding tooth has better compaction effect on the multilayer foil, the tooth height h2 of the second welding tooth is not larger than 0.6mm, the welding effect of the first welding tooth cannot be influenced by the too high tooth height of the second welding tooth, the contact of the first welding tooth and the multilayer foil due to the too high tooth height of the second welding tooth can be better avoided, the multilayer foil is welded by the ultrasonic welding head, the first welding tooth and the second welding tooth can fully contact the multilayer foil, the contact area of the first welding tooth and the multilayer foil is larger, and the compaction effect on the multilayer foil can be improved.

In some embodiments, the tooth end face is planar.

In the technical scheme, the welding tooth end face of the first welding tooth is set to be a plane, so that the contact area between the first welding tooth and the multilayer foil can be increased, the compaction area of the multilayer foil is increased, and the compaction effect of the multilayer foil is improved.

In some embodiments, the first tooth structure includes a third tooth disposed between adjacent first teeth.

In the technical scheme, the third welding teeth are arranged between the adjacent first welding teeth, so that the part of the multi-layer foil positioned between the adjacent first welding teeth can be compacted by the third welding teeth, the multi-layer foil is compacted uniformly, and the welding quality of the subsequent welding process is improved.

In some embodiments, the first tooth structure includes a fourth tooth disposed between the first tooth and an edge of the welding face.

In the technical scheme, the fourth welding teeth are arranged on the edges of the first welding teeth and the welding surface, so that the compaction effect of the fourth welding teeth can be obtained on the parts of the multi-layer foil material positioned on the edges of the first welding teeth and the welding surface, the multi-layer foil material is compacted uniformly, the welding quality of the subsequent welding process is improved, and the fourth welding teeth can also reduce the occurrence of the situation that the edges of the first welding teeth scratch the multi-layer foil material.

In some embodiments, the first tooth includes a tooth body and a plurality of tooth branches, the tooth body extends in a strip shape in an extending direction of the welding surface, the plurality of tooth branches are connected to at least one side of the tooth body in a width direction, and the second tooth is disposed on the tooth body and is consistent with the extending direction of the tooth body.

In the above technical scheme, through setting up first tooth into including tooth main part and a plurality of tooth branch connection in at least one side of the width direction of tooth main part, can increase the area of contact of first tooth and multilayer foil, be favorable to reinforcing compaction homogeneity and compaction effect to the multilayer foil, through locating the second tooth main part and unanimous with the extending direction of tooth main part, increased the contact length on second tooth structure and multilayer foil surface, the compaction effect between the reinforcing second tooth to the multilayer foil.

In some embodiments, the width of the second tooth is W2, and the width of the tooth body is W1, W2. Ltoreq.W1.

In the above technical scheme, the width W2 of the second welding tooth is smaller than or equal to the width W1 of the welding tooth main body, so that the width of the welding tooth main body of the first welding tooth is larger, a sufficient supporting area can be provided for the second welding tooth, the contact area between the first welding tooth and the multilayer foil is larger, and the compaction effect of the second welding tooth on the multilayer foil can be further enhanced.

In some embodiments, the ratio of W2 to W1 ranges from 0.5 to 0.9.

In the above technical scheme, through the width W2 of second welding tooth and the width W1 of welding tooth main part not less than 0.5, can make the area of contact of second welding tooth and multilayer foil great, the compaction scope is great, compaction effect is better to make the width W2 of second welding tooth and the width W1 of welding tooth main part not more than 0.9, make between second welding tooth and the first welding tooth form multistage welding tooth structure better, be favorable to realizing multistage mound to multilayer foil more pressing, compaction effect is better.

In some embodiments, the first tooth structure includes a third tooth, a plurality of receiving grooves are defined between two adjacent first teeth, the plurality of receiving grooves are arranged at intervals along the extending direction of the tooth body, the tooth branches are located between two adjacent receiving grooves, and the third tooth is located in the receiving groove.

In the technical scheme, the plurality of containing grooves are defined between the two adjacent first welding teeth and are distributed at intervals along the extending direction of the welding tooth main body, and the third welding teeth are arranged in the containing grooves, so that the contact area between the first welding tooth structure and the multi-layer foil can be further increased, the compaction effect of the third welding teeth can be obtained at the part, located between the two adjacent first welding teeth, of the multi-layer foil, and the multi-layer foil is compacted uniformly, thereby being beneficial to improving the welding quality of the subsequent welding process.

In some embodiments, the third tooth is prismoid.

In the technical scheme, the third welding teeth are in the prismatic table shape, so that the third welding teeth and the multi-layer foil have larger contact area and better compaction effect, the contact surface of the third welding teeth and the multi-layer foil can be formed into a welding pier pressing surface, a larger heat transfer area is provided, and welding cracks caused by local stress concentration of the multi-layer foil are reduced. ‌ A

In some embodiments, the first tooth structure includes a fourth tooth, the fourth tooth is disposed between the first tooth and an edge of the welding surface, the fourth tooth is plural, and plural fourth teeth located on the same side of the first tooth are arranged at intervals along an extending direction of the tooth main body.

According to the technical scheme, the fourth welding teeth are arranged on the edges of the first welding teeth and the welding surface, so that the part of the multi-layer foil material located on the edges of the first welding teeth and the welding surface can be compacted by the fourth welding teeth, the multi-layer foil material is compacted uniformly, the welding quality of a subsequent welding process is improved, the fourth welding teeth can reduce the situation that the edges of the first welding teeth scratch the multi-layer foil material, and the fourth welding teeth are arranged at intervals along the extending direction of the welding teeth main body, so that the fourth welding teeth are uniform in compaction of the multi-layer foil material, and the compacting effect is better.

In a second aspect, the invention provides an ultrasonic welding device comprising an ultrasonic horn according to an embodiment of the first aspect.

In the technical proposal, by arranging the ultrasonic welding head and adding the second welding tooth structure on one side of the first welding tooth structure of the ultrasonic welding head far away from the welding surface, the multi-stage upsetting can be carried out on the multi-layer foil, the compaction effect of the whole of the first welding tooth structure and the second welding tooth structure on the multi-layer foil welding can be enhanced, the gaps between the multi-layer foils can be reduced, which is helpful for improving the welding quality of the subsequent welding process, for example, when the subsequent welding process is a laser welding process, can reduce the problems of welding defects such as explosion points, collapse and the like generated in the laser welding process, can also reduce welding cracks, and the gaps among the multiple layers of foil materials are reduced, which is beneficial to improving the heat dissipation uniformity of the laser welding joint, thereby being beneficial to improving the problem of foil cracking caused by overlarge local stress of the foil; in addition, the second welding teeth are arranged to extend in a strip shape in the extending direction of the welding surface, so that the contact length between the second welding tooth structure and the surface of the multilayer foil can be increased, the compaction effect on the multilayer foil is further enhanced, thereby further reducing the gap between the multi-layer foils and being more beneficial to improving the welding quality of the subsequent welding process, for example, when the subsequent welding process is a laser welding process, because the compaction between the multi-layer foil materials at the welding position corresponding to the second welding tooth is tighter and the gap is smaller, so that the laser welding can be performed at the welding position corresponding to the second welding tooth, the laser welding defect can be reduced better, the laser welding quality can be improved better, when the ultrasonic welding head is used for welding the multilayer foil of the tab, the laser welding quality of the subsequent tab and the electrode terminal is improved, and the service stability of the battery is improved.

In a third aspect, the present invention provides a method for detecting wear of an ultrasonic horn, the ultrasonic horn being an ultrasonic horn according to an embodiment of the first aspect, the method comprising:

performing ultrasonic pre-welding on a workpiece sample by using the ultrasonic welding head, wherein the welding marks corresponding to the second welding teeth on the workpiece sample are second welding marks;

Identifying the second weld formed on the workpiece sample;

Calculating the welding area of the single second welding mark;

and judging the abrasion condition of the ultrasonic welding head according to the welding area of the single second welding mark.

According to the technical scheme, the abrasion condition of the second welding teeth in the ultrasonic welding head can be intuitively and accurately judged by calculating the single welding area of the second welding marks corresponding to the second welding teeth formed on the workpiece sample, so that the ultrasonic welding head can be replaced or maintained in time, the conditions of poor welding and poor compaction effect of the multilayer foil caused by abrasion of the ultrasonic welding head are reduced, the subsequent welding process is influenced, and the compaction effect of the ultrasonic welding head on the multilayer foil is improved.

In some embodiments, identifying the second weld formed on the workpiece sample includes:

collecting a welding image of one side of the workpiece sample, on which welding is formed;

the second weld in the weld image is identified.

In the technical scheme, the second welding mark in the welding mark image is identified by collecting the welding mark image on the side, on which the welding mark is formed, of the workpiece sample, so that the second welding mark can be conveniently identified and found.

In some embodiments, calculating a solder print area of a single said second solder print comprises:

identifying the outer contour of the single second weld;

and calculating the pattern area surrounded by the outer contour of the second welding mark.

In the technical scheme, the welding area of the second welding mark can be conveniently calculated by the calculation method of identifying the outline of the single second welding mark and then calculating the pattern area surrounded by the outline of the second welding mark, and the calculation mode of the welding area is simple and the calculation result is accurate.

In some embodiments, determining the wear of the ultrasonic horn based on the weld area of the single second weld comprises:

And judging the abrasion condition of the ultrasonic welding head according to the ratio of the welding area of the single second welding mark to the design area of the single second welding mark.

In the technical scheme, the amount of reduction of the welding area of the current second welding mark relative to the design area of the second welding mark can be obtained according to the magnitude relation of the ratio of the welding area of the single second welding mark to the design area of the single second welding mark, the amount of reduction of the welding area of the second welding mark relative to the design area of the second welding mark can be intuitively reflected, and therefore the abrasion condition of an ultrasonic welding head can be reflected, and the accuracy of judging the abrasion condition of the ultrasonic welding head is facilitated.

In some embodiments, determining the wear condition of the ultrasonic horn according to the ratio of the welding area of the single second welding mark to the design area of the single second welding mark includes:

And the welding area of the single second welding mark is Sx, the design area of the single second welding mark is S0, and under the condition that the ratio of Sx to S0 is smaller than 0.2, the service life of the ultrasonic welding head is judged to be reached.

In the technical scheme, whether the service life of the ultrasonic welding head is reached or not is judged by judging whether the ratio of the welding area Sx of the single second welding mark to the design area S0 of the single second welding mark is smaller than 0.2, so that whether the ultrasonic welding head should be replaced or maintained can be judged simply and accurately.

In a fourth aspect, the invention provides a battery cell, which comprises a shell, an electrode assembly and a battery cell, wherein the shell is provided with an electrode terminal, the electrode assembly is arranged in the shell and comprises a tab, the tab is connected with the electrode terminal, the tab comprises a plurality of tab sheets which are arranged in a stacked mode and are welded and connected, a welding area is formed on the tab, the welding area is formed by welding an ultrasonic welding head according to the embodiment of the first aspect, the welding area comprises a first welding mark and a second welding mark, the first welding mark and the second welding mark are both formed into a groove structure, and the second welding mark is formed on the bottom wall of the first welding mark and extends in a strip shape.

According to the technical scheme, the first welding marks and the second welding marks which are of groove structures are formed on the multi-layer tab pieces of the tab, the multi-layer tab pieces can be compacted in the multi-layer tab piece welding process, air between the multi-layer tab pieces is discharged, gaps between the multi-layer tab pieces are reduced, the problems of explosion points, collapse, welding cracks, tab piece cracking and the like caused by the air between the multi-layer tab pieces in the subsequent welding process are reduced, the second welding marks are formed on the bottom wall of the first welding marks and extend in a strip shape, the second welding marks and the first welding marks can form a multi-stage welding mark structure, the length of the second welding marks is large, the compacting effect on the multi-layer tab pieces can be further enhanced in the multi-layer tab piece welding process, and therefore gaps between the multi-layer tab pieces can be further reduced, the welding quality of the subsequent welding process can be improved, for example, when the subsequent welding process is a laser welding process, the compacted tab pieces at the second welding position is more compact, the gaps between the second tab pieces can be reduced, the laser welding terminal quality can be better improved, the quality of the laser welding terminal can be better welded with the laser terminal can be better, and the quality of the laser terminal can be better welded.

In some embodiments, the first solder comprises a solder body and a plurality of solder branches, the solder body is in a strip shape, the plurality of solder branches are connected to at least one side of the solder body in the width direction, and the second solder is formed on the bottom wall of the solder body and is consistent with the extending direction of the solder body.

In the above technical scheme, through making the first welding seal on the utmost point ear including welding seal main part and a plurality of welding seal branch to make the welding seal main part be rectangular shape, can increase the welding seal area and the welding seal length of first welding seal, be favorable to reinforcing the compaction homogeneity and the compaction effect to multilayer utmost point ear piece, through forming the second welding seal at the diapire of welding seal main part and unanimous with the extending direction of welding seal main part, can increase the welding seal length and the welding seal area of second welding seal, be favorable to reinforcing the second welding seal to the compaction effect between the multilayer utmost point ear piece.

In some embodiments, the solder mask region includes a third solder mask located between adjacent ones of the first solder masks.

In the technical scheme, the third welding marks are arranged between the adjacent first welding marks, so that the welding mark area can be further increased, the part, located between the adjacent first welding marks, of the multi-layer tab can be compacted, the multi-layer tab is compacted uniformly, and the welding quality of the subsequent welding process is improved.

In some embodiments, the solder pad includes a fourth solder pad located between the first solder pad and an edge of the tab.

In the technical scheme, the fourth welding marks are printed in the welding mark area between the first welding marks of the electrode lugs and the edges of the electrode lugs, so that the parts of the multi-layer electrode lugs, which are positioned at the edges of the first welding marks and the electrode lugs, can be compacted, and the multi-layer electrode lugs are compacted uniformly, thereby being beneficial to improving the welding quality of the subsequent welding process.

In some embodiments, a plurality of layers of the tab pieces of the tab are connected by ultrasonic welding, the tab pieces are connected with the electrode terminals by laser welding and form laser welding seams, and the laser welding seams and the second welding seams are oppositely arranged in the stacking direction of the plurality of layers of tab pieces.

In the above technical scheme, through carrying out ultrasonic welding connection with the multilayer tab of tab, ultrasonic welding forms foretell welding mark district on the tab, and this welding mark district includes foretell first welding mark and second welding mark, can compact multilayer tab during ultrasonic welding, reduce the clearance between the multilayer tab, be convenient for tab and electrode terminal laser welding connection, the tab explodes the point, the production of the condition such as subsides when reducing laser welding, can improve the laser welding quality between tab and the electrode terminal, be favorable to improving the stability of service of battery.

In a fifth aspect, the invention provides a battery device comprising a case, and a battery cell according to the fourth aspect, disposed in the case.

According to the technical scheme, the battery monomer is arranged, the first welding marks and the second welding marks which are of groove structures are formed by welding on the multi-layer tab pieces of the tab, the multi-layer tab pieces can be compacted in the welding process of the multi-layer tab pieces, air between the multi-layer tab pieces is discharged, gaps between the multi-layer tab pieces are reduced, the problems of explosion points, collapse, welding cracks, tab piece cracking and the like caused by the air between the multi-layer tab pieces in the subsequent welding process are reduced, the second welding marks are formed on the bottom wall of the first welding marks and extend in a strip shape, the second welding marks and the first welding marks can be of a multi-stage welding mark structure, the length of the second welding marks is large, in the welding process of the multi-layer tab pieces, the compacting effect on the multi-layer tab pieces can be further enhanced, the gaps between the multi-layer tab pieces can be further reduced, the welding quality of the subsequent welding process is improved, for example, when the subsequent welding process is a laser welding process, the gaps between the second tab pieces at the position of the second welding position are more compact, the tab pieces at the position of the second welding process is better, the laser welding terminal quality can be better improved, the quality of the laser welding terminal can be better improved, and the quality of the laser welding terminal can be better welded, and the quality of the service of the laser terminal can be better improved.

In a sixth aspect, the present invention provides an electrical device comprising a battery device of the fifth aspect embodiment.

According to the technical scheme, through the battery device, the battery single body is arranged in the battery device, the first welding marks and the second welding marks which are of groove structures are formed by welding on the multi-layer tab pieces of the tab, the multi-layer tab pieces can be compacted in the welding process of the multi-layer tab pieces, air between the multi-layer tab pieces is discharged, gaps between the multi-layer tab pieces are reduced, the problems of explosion points, collapse, welding cracks, tab piece cracking and the like caused by air between the multi-layer tab pieces in a subsequent welding process are reduced, the second welding marks are formed on the bottom wall of the first welding marks and extend in a strip shape, the second welding marks and the first welding marks can form a multi-stage welding mark structure, the length of the second welding marks is larger, in the welding process of the multi-layer tab pieces, the compacting effect on the multi-layer tab pieces can be further enhanced, the gaps between the multi-layer tab pieces can be further reduced, the welding quality of the subsequent welding process can be better improved, for example, the welding quality of the subsequent welding process can be better improved, the laser welding process can be better, the laser welding terminal can be better in the welding process can be better improved, the laser welding terminal can be better in the laser welding process, the quality of the laser terminal can be better in the service of the laser terminal can be better welded, and the quality of the laser terminal can be better in the laser terminal welded.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic illustration of an ultrasonic horn according to some embodiments of the present invention;

FIG. 2 is a partial schematic view of the ultrasonic horn of FIG. 1;

FIG. 3 is a schematic view of the ultrasonic horn of FIG. 1 at another angle;

FIG. 4 is a side view of FIG. 1;

fig. 5 is an enlarged view at a in fig. 4;

FIG. 6 is a schematic illustration of an ultrasonic horn welding a tab of a battery cell according to some embodiments of the invention;

fig. 7 is an enlarged view at B in fig. 6;

FIG. 8 is a schematic illustration of a first weld and a second weld on a workpiece sample according to some embodiments of the invention;

fig. 9 is a schematic view of a battery cell according to some embodiments of the invention;

fig. 10 is a schematic view of a battery device according to some embodiments of the invention;

fig. 11 is a schematic diagram of an electrical device according to some embodiments of the invention.

Reference numerals:

100. an ultrasonic welding head;

10. welding head main body, 11, welding surface, 12, tooth end surface, 13, holding groove;

20. a first tooth structure; 21, first welding teeth, 211, a welding tooth main body, 212, welding tooth branches, 22, welding tooth end surfaces, 23, third welding teeth, 24 and fourth welding teeth;

30. A second tooth structure; 31, second welding teeth;

200. a battery device 201, a case;

40. a battery cell;

41. the electrode comprises a shell 401, electrode terminals 42, electrode lugs 43, welding areas 44, first welding marks 45, second welding marks 46 and electrode assemblies;

50. a sample workpiece;

300. 60 parts of electric device and a vehicle body.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, the terms used in the description of this invention in this application are for the purpose of describing particular embodiments only and are not intended to be limiting of the invention, and the terms "comprising" and "having" and any variations thereof in the description of this invention and the claims and the above description of the drawings are intended to cover non-exclusive inclusions. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "attached" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, directly connected, indirectly connected through an intermediary, or may be in communication with the interior of two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

The term "and/or" in the present invention is merely an association relation describing the association object, and indicates that three kinds of relations may exist, for example, a and/or B may indicate that a exists alone, while a and B exist together, and B exists alone. In the present invention, the character "/" generally indicates that the front and rear related objects are an or relationship.

In the embodiments of the present invention, the same reference numerals denote the same components, and detailed descriptions of the same components are omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width, etc. dimensions of the various components in the embodiments of the invention shown in the drawings, as well as the overall thickness, length, width, etc. dimensions of the integrated device, are merely illustrative and should not be construed as limiting the invention in any way.

The term "plurality" as used herein means two or more (including two).

In the examples of the present invention, all embodiments of the present invention and alternative embodiments may be combined with each other to form new technical solutions, unless specifically stated otherwise.

In the embodiments of the present invention, all technical features and optional technical features of the present invention may be combined with each other to form a new technical solution if not specifically described.

In embodiments of the invention, the battery device (Battery Apparatus) may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) may include a plurality of battery cells connected in series, parallel, or series-parallel by a bus bar. For example, the Battery cell assembly (Battery Cell Assembly) is typically formed by arranging a plurality of Battery cells, and the Battery cell assembly may be a Battery Module (Battery Module) formed by arranging and fixing a plurality of Battery cells to form an independent Module. As an example, the battery module may be formed by binding a plurality of battery cells by a tie.

The battery device may be a battery Pack (battery Pack) that includes a case and one or more battery cell assemblies that are housed in the case. The battery unit component can be a battery module and can be accommodated in the box body in a mode of fixing the battery module in the box body, and the battery unit component can also be accommodated in the box body in a mode of directly fixing a plurality of battery units in the box body.

In an embodiment of the present invention, the case may include a first case and a second case. The first box body and the second box body are buckled, so that a closed space is formed inside the box body to accommodate the battery cell assembly. The closing means covering or closing, and can be sealing or unsealing. The first housing may be a top cover or a bottom plate. For example, the case may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected with the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

In an embodiment of the invention, the tank may be part of the chassis structure of the vehicle. For example, a portion of the tank may become at least a portion of the floor of the vehicle, or a portion of the tank may become at least a portion of the cross member and the side member of the vehicle.

In the embodiment of the invention, the battery cell may be a secondary battery, and the secondary battery refers to a battery cell which can activate an active material in a charging manner to continue to use after the battery cell is discharged, and the battery cell may be a lithium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead storage battery and the like. The battery cell may be in a cylindrical shape, a flat shape, a rectangular parallelepiped shape, or other shapes, which is not limited in the embodiment of the present invention. The battery cells are generally classified into three types, i.e., a cylindrical battery cell, a prismatic battery cell, and a pouch battery cell, according to the packaging method, to which the embodiment of the present invention is not limited.

The battery cell, which is the smallest energy unit of the battery device, includes a case and an electrode assembly disposed in the case. The electrode assembly is a component in which electrochemical reactions occur in the battery cells. One or more electrode assemblies may be contained within the case. The electrode assembly is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The portions of the positive electrode sheet and the negative electrode sheet having the active material constitute the main body portion of the electrode assembly, and the portions of the positive electrode sheet and the negative electrode sheet having no active material constitute the tabs, respectively.

The positive electrode sheet may include a positive electrode current collector and a positive electrode film layer disposed on at least one surface of the positive electrode current collector, the positive electrode film layer including a positive electrode active material.

As an example, the positive electrode current collector has two surfaces opposing in its own thickness direction, and the positive electrode film layer is provided on either one or both of the two surfaces opposing the positive electrode current collector.

As an example, the positive electrode current collector may employ a metal foil or a composite current collector.

The negative electrode sheet may include a negative electrode current collector and a negative electrode film layer disposed on at least one surface of the negative electrode current collector, the negative electrode film layer including a negative electrode active material.

As an example, the anode current collector has two surfaces opposing in its own thickness direction, and the anode film layer is provided on either one or both of the two surfaces opposing the anode current collector.

As an example, the negative electrode current collector may employ a metal foil, a foam metal, or a composite current collector.

Currently, the more widely the battery is used in view of the development of market situation. The battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles and the like, and various fields such as aerospace and the like. With the continuous expansion of the application field of the power battery, the market demand of the power battery is also continuously expanding.

Based on this, the invention proposes an ultrasonic horn comprising a horn body, a first tooth structure and a second tooth structure. The welding head main body is provided with a welding surface, the first welding tooth structure is convexly arranged on the welding surface, the second welding tooth structure is convexly arranged on one side, far away from the welding surface, of the first welding tooth structure, the second welding tooth structure comprises at least one second welding tooth, and the second welding tooth extends in a strip shape in the extending direction of the welding surface.

In the ultrasonic welding head, the second welding tooth structure is added on one side, far away from the welding surface, of the first welding tooth structure of the ultrasonic welding head, so that multistage pier pressing can be conducted on the multilayer foil, the compaction effect of the whole of the first welding tooth structure and the second welding tooth structure on the multilayer foil can be enhanced, gaps between the multilayer foil can be reduced, welding quality of subsequent welding procedures can be improved, for example, when the subsequent welding procedures are laser welding procedures, welding defect problems such as explosion points and collapse generated in the laser welding process can be reduced, welding cracks can be reduced, and due to the fact that gaps between the multilayer foil are reduced, the heat dissipation uniformity of the laser welding joint can be improved, the problem of foil cracking caused by overlarge local stress of the foil can be improved, and by arranging the second welding tooth structure to extend in a strip shape in the extending direction of the welding surface, the contact length of the second welding tooth structure and the surface of the multilayer foil, the compaction effect on the multilayer foil can be further enhanced, the gap between the multilayer foil can be further reduced, the gaps between the multilayer foil can be improved, the welding quality of the laser welding terminal can be improved, the welding quality of the laser welding terminal can be improved, and the welding terminal can be welded to the corresponding to the electrode can be welded to the electrode in the welding position of the next welding procedure, and the welding terminal can be better, and the welding quality of the welding terminal can be better corresponding to the welding quality of the laser welding terminal can be improved, and the welding terminal.

The battery device disclosed by the embodiment of the invention can be used for electric equipment using the battery device as a power supply or various energy storage systems using the battery device as an energy storage element. The battery device may be used for, but not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, and the like, in addition to a vehicle. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.

The power utilization device disclosed by the embodiment of the invention can be a fuel oil automobile, a fuel gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range-extended automobile and the like. The interior of the vehicle is provided with a battery device, which may be provided at the bottom or at the head or at the tail of the vehicle. The battery device may be used for power supply of the vehicle, for example, the battery device may be used as an operating power source of the vehicle. The vehicle may also include a controller and a motor, the controller being configured to control the battery device to power the motor, for example, for operating power requirements during start-up, navigation and travel of the vehicle. In some embodiments of the invention, the battery device may be used not only as an operating power source for the vehicle, but also as a driving power source for the vehicle, instead of or in part instead of fuel oil or natural gas, to provide driving power for the vehicle.

An ultrasonic horn 100 according to an embodiment of the present invention is described below with reference to fig. 1-9.

Referring to fig. 1-3, in a first aspect, the present invention provides an ultrasonic horn 100 comprising a horn body 10, a first tooth structure 20, and a second tooth structure 30. The welding head body 10 has a welding surface 11, the first tooth structure 20 is protruded on the welding surface 11, the second tooth structure 30 is protruded on one side of the first tooth structure 20 away from the welding surface 11, the second tooth structure 30 includes at least one second tooth 31, and the second tooth 31 extends in a strip shape in the extending direction of the welding surface 11.

The ultrasonic horn 100 is a portion of the welding member of the ultrasonic welding apparatus that contacts the multi-layer foil during welding, and the high-frequency vibration energy generated by the transducer of the ultrasonic horn 100 is typically amplitude-adjusted by the horn and finally transferred to the ultrasonic horn 100, and the ultrasonic horn 100 concentrates the received vibration energy on the joint portion of the multi-layer foil, and under the condition of pressurization, the vibration energy is converted into heat energy by friction, so that the welding members are welded together. ‌ A

Wherein the welding head body 10 has a welding face 11, the welding face 11 may be a plane where the welding head body 10 contacts the multi-layered foil. For example, the horn body 10 may be made of a material having good heat conductivity and corrosion resistance, such as an aluminum alloy, a titanium alloy, or stainless steel.

The first tooth structure 20 is protruding from the welding surface 11, which means that the first tooth structure 20 is located on the welding surface 11 and protrudes relative to the welding surface 11.

The first tooth structure 20 is provided on the welding surface 11, and the first tooth structure 21 can efficiently transfer vibration energy to the welding portion while transferring pressure and amplitude, and under pressure, the welding members are welded together by being converted into heat energy by friction.

The second welding tooth structure 30 is arranged on one side, far away from the welding surface 11, of the first welding tooth structure in a protruding mode, the second welding tooth structure 30 compacts the multi-layer foil when the multi-layer foil is welded through ultrasonic waves, gaps among the multi-layer foil are reduced, and quality of a subsequent welding process is improved. If the multi-layer foil is still in a gap after ultrasonic welding, the problem of uneven heat dissipation in the subsequent welding process is caused, and the multi-layer foil is cracked due to overlarge local pressure.

For example, the direction in which the first tooth structure protrudes from the welding surface 11 may refer to the e3 direction in the drawing.

The second tooth structure 30 comprises at least one second tooth 31, either the second tooth structure 30 comprises one second tooth 31 or the second tooth structure 30 comprises a plurality of second teeth 31. By making the second welding tooth structure 30 include at least one second welding tooth 31, and making the second welding tooth 31 extend in a strip shape in the extending direction of the welding surface 11, the contact length between the second welding tooth structure 30 and the surface of the multilayer foil is longer, and the compacting effect of the second welding tooth structure 30 on the surface of the multilayer foil is enhanced.

In the above technical solution, by adding the second tooth structure 30 on the side of the first tooth structure 20 of the ultrasonic welding head 100 away from the welding surface 11, multi-stage upsetting can be performed on the multi-layer foil, the compaction effect of the whole of the first tooth structure 20 and the second tooth structure 30 on the multi-layer foil welding can be enhanced, the gap between the multi-layer foil can be reduced, the welding quality of the subsequent welding procedure can be improved, for example, when the subsequent welding procedure is a laser welding procedure, the welding defect problems such as explosion point, collapse and the like generated in the laser welding process can be reduced, the welding crack can be reduced, and the heat dissipation uniformity of the laser welding joint can be improved due to the reduced gap between the multi-layer foil, thereby being beneficial to improving the foil cracking problem caused by overlarge local stress of the foil; in addition, the second welding teeth 31 are arranged to extend in a strip shape in the extending direction of the welding surface 11, so that the contact length between the second welding tooth structure 30 and the surface of the multi-layer foil material can be increased, the compaction effect on the multi-layer foil material can be further enhanced, the gap between the multi-layer foil material can be further reduced, the welding quality of the subsequent welding process can be further improved, for example, when the subsequent welding process is a laser welding process, the compaction between the multi-layer foil material is tighter and the gap is smaller due to the welding position corresponding to the second welding teeth 31, the laser welding defect can be better reduced, the laser welding quality can be better improved, the laser welding quality of the subsequent electrode lug 42 and the electrode terminal 401 can be better improved when the ultrasonic welding head 100 is used for welding the multi-layer foil material of the electrode lug 42, is beneficial to improving the service stability of the battery.

Referring to fig. 1-5, in some embodiments, the second tooth 31 extends longitudinally to opposite ends of the weld face 11.

For example, both ends in the length direction of the second welding tooth 31 may extend to both ends in the length direction of the welding surface 11, respectively.

In the above technical solution, the two ends of the second welding tooth 31 in the length direction are respectively extended to the two opposite ends of the welding surface 11, so that the length of the second welding tooth 31 can be increased, when the ultrasonic welding is performed, the contact length between the second welding tooth structure 30 and the surface of the multi-layer foil is longer, the compacting effect of the second welding tooth structure 30 on the multi-layer foil is further enhanced, and because the length of the second welding tooth 31 is longer, the corresponding welding mark of the second welding tooth 31 is longer, when the corresponding welding mark position of the second welding tooth 31 is welded by laser in the subsequent welding process, the length of the laser welding is longer, which is beneficial to improving the reliability and stability of the subsequent welding connection, for example, when the ultrasonic welding head 100 is used for welding the multi-layer foil of the tab 42 and the electrode terminal 401, the laser welding seam between the tab 42 and the electrode terminal 401 is longer, which is beneficial to improving the stability and reliability of the connection of the tab 42 and the electrode terminal 401.

Referring to fig. 2-3, in some embodiments, the second tooth 31 extends along the length of the welding surface 11.

For example, the welding surface 11 may be rectangular.

For example, the longitudinal direction of the welding surface 11 may refer to the e1 direction in the drawing.

In the above-described technical solution, by extending the second welding teeth 31 along the longitudinal direction of the welding surface 11, the length of the second welding teeth 31 can be increased by utilizing the space in the longitudinal direction of the welding surface 11, and the contact length between the second welding tooth structure 30 and the surface of the multilayer foil material is longer when the ultrasonic welding is performed, so that the compacting effect of the second welding tooth structure 30 on the multilayer foil material is enhanced.

Referring to fig. 2-3, in some embodiments, the second tooth 31 extends along the width of the welding surface 11.

For example, the welding surface 11 may be rectangular.

For example, the width direction of the welding surface 11 may refer to the e2 direction in the drawing.

In the above technical solution, the second welding teeth 31 extend along the width direction of the welding surface 11, so that the space in the width direction of the welding surface 11 can be utilized, and the number of the second welding teeth 31 can be increased, so that the contact area between the second welding tooth structure 30 and the surface of the multilayer foil is larger when the ultrasonic welding is performed, and the compacting effect of the second welding tooth structure 30 on the multilayer foil is enhanced.

Referring to fig. 2-3, in some embodiments, the second wire 31 extends in a straight line.

In the technical scheme, the second welding teeth 31 extending along the straight line are arranged, so that the result of the second welding teeth 31 is simple, the processing and the forming are convenient, and the welding marks corresponding to the second welding teeth 31 extending along the straight line basically extend along the straight line, so that in the subsequent welding process, the welding connection can be carried out along the straight line, and the subsequent welding process is simpler in design.

Referring to fig. 2-3, in some embodiments, the second bond 31 is a plurality of spaced apart.

For example, the second welding teeth 31 may be two, three, four, etc. arranged at intervals.

In the above technical scheme, through setting up the second welding tooth 31 that a plurality of intervals set up, a plurality of second welding teeth 31 can compact a plurality of different positions of a plurality of multilayer foils to can make the clearance of a plurality of different positions of multilayer foils reduce, help promoting follow-up welding process quality.

Referring to fig. 2-3, in some embodiments, a plurality of second teeth 31 are disposed side-by-side along a width direction of the second teeth 31.

Wherein, the width direction of the second welding teeth 31 is perpendicular to the extending direction of the second welding teeth 31.

In the above technical solution, the contact area between the second welding tooth structure 30 and the surface of the multi-layer foil can be increased by arranging the plurality of second welding teeth 31 side by side along the width direction of the second welding teeth 31, so as to enhance the compacting effect on the multi-layer foil, and reduce the gaps at different positions of the second welding teeth 31 of the multi-layer foil in the width direction, thereby being beneficial to improving the quality of the subsequent welding process.

Referring to fig. 2-3, in some embodiments, the second weld teeth 31 extend along the length of the welding surface 11 and the plurality of second weld teeth 31 are arranged along the width of the welding surface 11.

In the above technical scheme, the second welding teeth 31 extend along the length direction of the welding surface 11, so that the space in the length direction of the welding surface 11 can be fully utilized, the extending length of the second welding teeth 31 is longer, the plurality of second welding teeth 31 are distributed along the width direction of the welding surface 11, the distribution of the plurality of second welding teeth 31 is more uniform, the contact length and the contact area between the second welding tooth structure 30 and the surface of the multilayer foil material can be increased, the contact between the second welding tooth structure 30 and the surface of the multilayer foil material is more uniform, the heat between the multilayer foil materials is more uniformly distributed, and the compacting effect on the multilayer foil material can be enhanced.

Referring to fig. 2, in some embodiments, in the arrangement direction of the plurality of second bonding wires 31, a distance between two adjacent second bonding wires 31 is d1, and a maximum width of the second bonding wires 31 is W2, W2< d1.

In the direction in which the second welding teeth 31 protrude from the welding surface 11, when the widths of the second welding teeth 31 are consistent, the width of the second welding teeth 31 is the maximum width of the second welding teeth 31. In the direction in which the second welding teeth 31 protrude from the welding surface 11, when the width of the second welding teeth 31 is changed, the width at the maximum width of the second welding teeth 31 is the maximum width of the second welding teeth 31.

In the above technical solution, the maximum width W2 of the second welding teeth 31 is smaller than the distance d1 between two adjacent second welding teeth 31, so that the width of the second welding teeth 31 is smaller, and under a certain welding pressure, the second welding teeth 31 can generate a larger pressure on the multi-layer foil, so as to further enhance the compaction effect of the second welding teeth 31 on the multi-layer foil.

Referring to FIG. 2, in some embodiments, the ratio of W2 to d1 ranges from 0.2 to 0.8.

For example, the ratio of the maximum width W2 of the second welding teeth 31 to the spacing d1 between adjacent two of the second welding teeth 31 may be 0.2, 0.4, 0.6, 0.8, or the like.

In the above technical solution, the ratio of the maximum width W2 of the second welding teeth 31 to the distance d1 between two adjacent second welding teeth 31 is set within the range of 0.2-0.8, so that a larger pressure can be generated on the multi-layer foil under a certain welding pressure, and meanwhile, the contact area between the second welding tooth structure 30 and the surface of the multi-layer foil is larger, so that the compaction effect on the multi-layer foil is enhanced.

Referring to fig. 2, in some embodiments, in the arrangement direction of the plurality of second welding teeth 31, the minimum distance between the second welding teeth 31 and the edge of the welding surface 11 is d2, and the width of the second welding teeth 31 is W2, d2> W2.

In the above technical solution, the minimum distance d2 between the second welding tooth 31 and the edge of the welding surface 11 is greater than the maximum width W2 of the second welding tooth 31, so that the second welding tooth 31 and the edge of the welding surface 11 have a certain distance, and the second welding tooth 31 can better compact the multi-layer foil, thereby enhancing the compacting effect between the multi-layer foil.

Referring to fig. 7, in some embodiments, the cross section of the second tooth 31 is a second cross section having a tapered portion that extends to a side of the second tooth 31 away from the welding face 11, the tapered portion gradually decreasing in width in a direction from the welding face 11 to the second tooth 31.

The cross section of the second welding tooth 31 obtained by cutting the second welding tooth 31 perpendicular to the plane of the length direction of the second welding tooth 31 is the cross section of the second welding tooth 31.

The width of the tapered portion refers to the dimension of the tapered portion in the width direction of the second welding tooth 31.

The second tooth 31 may be partially tapered, or the entire second tooth 31 may be tapered.

In the above technical solution, the width of the tapered portion of the second welding tooth 31 is gradually reduced in the direction from the welding surface 11 to the second welding tooth 31, so that the second welding tooth 31 has a larger pressure on the multi-layer foil under a certain welding pressure, thereby enhancing the compacting effect of the second welding tooth 31 on the multi-layer foil.

Referring to fig. 2-7, in some embodiments, at least a portion of the second wire 31 has the same cross-sectional area in the direction of extension of the second wire 31.

For example, the cross-sectional area of the second welding tooth 31 may be the same in the extending direction of the second welding tooth 31, or the cross-sectional areas of all the second welding teeth 31 may be the same.

In the above technical solution, by making the cross-sectional area of at least part of the second welding teeth 31 in the extending direction the same, it is possible to keep the compaction of the second welding teeth 31 on the multi-layer foil material in the extending direction relatively uniform, thereby enhancing the compaction effect of the second welding teeth 31 on the multi-layer foil material, and the width dimension of the welding marks corresponding to the second welding teeth 31 in the extending direction is relatively uniform, so that the welding connection operation of the subsequent welding process at the welding marks corresponding to the second welding teeth 31 is facilitated.

Referring to fig. 7, in some embodiments, the second tooth 31 is arcuate, circular, or elliptical in cross-section.

For example, the cross-section of the second tooth 31 may be one of arcuate, circular, or elliptical.

In the above-described technical solution, the cross section of the second welding tooth 31 is configured to be arcuate, circular, elliptical, or the like, so that the foil can be hardly scratched when the surface of the second welding tooth 31 contacts with the multi-layer foil.

Referring to fig. 2, in some embodiments, the second weld tooth 31 includes a tooth portion.

For example, the second tooth 31 includes a tooth portion, which may be a second tooth portion formed by the second tooth 31 itself.

In the above technical solution, the second welding tooth 31 includes a tooth portion, so that the structure of the second welding tooth 31 is simple and the processing and forming are convenient.

Referring to fig. 2-7, in some embodiments, the second welding tooth 31 includes a plurality of teeth, a surface of the tooth on a side far from the welding surface 11 forms a tooth end surface 12, the plurality of teeth are respectively a first tooth to an mth tooth sequentially arranged along a protruding direction of the second welding tooth 31, the nth tooth is arranged on the tooth end surface 12 of the (n-1) th tooth, and a projection of the nth tooth on the tooth end surface 12 of the (n-1) th tooth is positioned in the tooth end surface 12 of the (n-1) th tooth, wherein n is equal to or greater than 2 and equal to m.

For example, n may have a value of 2,3, 4, 5, etc., m may have a value of 2,3, 4, 5, etc., and 2≤n≤m is satisfied.

In the above technical solution, the second tooth 31 is set to include a plurality of teeth, and the plurality of teeth are respectively a first tooth to an mth tooth which are sequentially set along the protruding direction of the second tooth 31, the nth tooth is disposed on the tooth end face 12 of the (n-1) th tooth, the projection of the nth tooth on the tooth end face 12 of the (n-1) th tooth is disposed in the tooth end face 12 of the (n-1) th tooth, so that the portion of the tooth end face 12 of the (n-1) th tooth far from the welding face 11 side beyond the nth tooth can be formed into a welding pier surface, when the ultrasonic welding head 100 welds the welding materials, each tooth can tamp and pier the multilayer foil to realize the multilayer pier pressing and the tamping of the welding materials, further enhance the compacting effect between the multilayer foil, further reduce the gap between the multilayer foil, further reduce the easy-caused energy loss due to the too large gap between the multilayer foil and facilitate the subsequent welding process.

Referring to fig. 2-3, in some embodiments, the first tooth structure 20 includes a first tooth 21, a side surface of the first tooth 21 remote from the welding surface 11 forms a tooth end surface 22, a second tooth 31 is provided on the tooth end surface 22, and a projection of the second tooth 31 on the tooth end surface 22 is located in the tooth end surface 22.

In the above technical scheme, the second welding teeth 31 are arranged in the welding tooth end face 22 of the first welding teeth 21, so that an obvious boundary exists between the second welding teeth 31 and the first welding teeth 21, the first welding teeth 21 and the second welding teeth 31 are more favorable to form a multi-stage welding tooth structure, the multi-stage upsetting is more favorable to realize multi-stage upsetting on the multi-layer foil, and the compaction effect is better.

Referring to fig. 5, in some embodiments, in the protruding direction of the first welding tooth 21 relative to the welding surface 11, the tooth height of the first welding tooth 21 is h1, the tooth height of the second welding tooth 31 is h2, and the ratio of h2 to h1 ranges from 0.3 to 0.8.

The protruding direction of the first welding tooth 21 with respect to the welding surface 11 may be referred to as e3 direction in the drawing.

For example, the ratio of h2 to h1 may be 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, etc.

In the above technical solution, the ratio of the tooth height h2 of the second welding tooth 31 to the tooth height h1 of the first welding tooth 21 is not less than 0.3, so that the second welding tooth 31 has a higher tooth height, and therefore, the second welding tooth 31 has a better compaction effect on the multi-layer foil, and the ratio of the tooth height h2 of the second welding tooth 31 to the tooth height h1 of the first welding tooth 21 is not greater than 0.8, so that the welding effect of the first welding tooth 21 is not affected by the too high tooth height of the second welding tooth 31, and thus, the contact of the first welding tooth 21 with the multi-layer foil due to the too high tooth height of the second welding tooth 31 can be well avoided, and therefore, the multi-layer foil can be fully contacted by both the first welding tooth 21 and the second welding tooth 31 at the ultrasonic welding head 100, and the multi-layer foil compaction effect can be improved due to the larger contact area of the first welding tooth 21 and the second welding tooth 31 with the multi-layer foil.

Referring to fig. 5, in some embodiments, in a protruding direction of the first welding tooth 21 relative to the welding surface 11, the tooth height of the first welding tooth 21 is h1, and the range of the value of h1 is 0.2mm to 0.6mm.

For example, the tooth height h1 of the first welding tooth 21 may be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, or the like.

In the above technical solution, the tooth height h2 of the second welding tooth 31 is not smaller than 0.2mm, so that the second welding tooth 31 has a higher tooth height, and therefore, the second welding tooth 31 has a better compaction effect on the multi-layer foil, and the tooth height h2 of the second welding tooth 31 is not larger than 0.6mm, so that the second welding tooth 31 cannot influence the welding effect of the first welding tooth 21 due to the too high tooth height, and thus, the contact of the first welding tooth 21 with the multi-layer foil due to the too high tooth height of the second welding tooth 31 can be better avoided, the multi-layer foil can be fully contacted with both the first welding tooth 21 and the second welding tooth 31 at the ultrasonic welding head 100, and the compaction effect on the multi-layer foil can be improved.

Referring to fig. 2, in some embodiments, the tooth end face 22 is planar.

In the above technical solution, the contact area between the first welding tooth 21 and the multi-layer foil can be increased by setting the welding tooth end face 22 of the first welding tooth 21 to be a plane, so that the compaction area of the multi-layer foil is increased, and the compaction effect of the multi-layer foil is improved.

Referring to fig. 2-3, in some embodiments, the first tooth structure 20 includes a third tooth 23, the third tooth 23 being disposed between adjacent first teeth 21.

For example, the third welding teeth 23 are located between adjacent first welding teeth 21, and the third welding teeth 23 may be located in the middle of two adjacent first welding teeth 21.

In the above technical solution, the third welding teeth 23 are disposed between the adjacent first welding teeth 21, so that the portion of the multi-layer foil located between the adjacent first welding teeth 21 can obtain the compaction effect of the third welding teeth 23, so that the multi-layer foil is compacted uniformly, and the welding quality of the subsequent welding process is improved.

Referring to fig. 2-3, in some embodiments, the first tooth structure 20 includes a fourth tooth 24, the fourth tooth 24 being disposed between the first tooth 21 and an edge of the welding face 11.

For example, the fourth tooth 24 may be provided between the first tooth 21 and an edge of the welding face 11 extending in the length direction of the welding face 11.

In the above technical solution, the fourth welding teeth 24 are disposed at the edges of the first welding teeth 21 and the welding surface 11, so that the portion of the multi-layer foil located at the edges of the first welding teeth 21 and the welding surface 11 can obtain the compaction effect of the fourth welding teeth 24, so that the multi-layer foil is compacted uniformly, which is beneficial to improving the welding quality of the subsequent welding process, and the fourth welding teeth 24 can also reduce the occurrence of the situation that the edges of the first welding teeth 21 scratch the multi-layer foil.

Referring to fig. 2-3, in some embodiments, the first tooth 21 includes a tooth body 211 and a plurality of tooth branches 212, the tooth body 211 extends in a long shape in an extending direction of the welding face 11, the plurality of tooth branches 212 are connected to at least one side of the tooth body 211 in a width direction, and the second tooth 31 is provided on the tooth body 211 and coincides with the extending direction of the tooth body 211.

For example, the first tooth 21 may include two, three, four, five, etc. plurality of tooth branches 212.

The plurality of tooth branches 212 are connected to at least one side in the width direction of the tooth body 211, and the plurality of tooth branches 212 may be connected to one side in the width direction of the tooth body 211, or the plurality of tooth branches 212 may be connected to both sides in the width direction of the tooth body 211.

In the above technical solution, by arranging the first welding teeth 21 to include the welding tooth main body 211 and the plurality of welding tooth branches 212, and connecting the plurality of welding tooth branches 212 to at least one side of the width direction of the welding tooth main body 211, the contact area between the first welding teeth 21 and the multi-layer foil can be increased, which is beneficial to enhancing the compaction uniformity and the compaction effect on the multi-layer foil, and by arranging the second welding teeth 31 on the welding tooth main body 211 and consistent with the extending direction of the welding tooth main body 211, the contact length between the second welding tooth structure 30 and the surface of the multi-layer foil is increased, and the compaction effect of the second welding teeth 31 on the multi-layer foil is enhanced.

Referring to FIG. 2, in some embodiments, the second tooth 31 has a width W2, and the tooth body 211 has a width W1, W2. Ltoreq.W1.

For example, the width direction of the second tooth 31 and the width direction of the tooth body 211 may refer to the e2 direction in the drawing.

In the above technical solution, by making the width W2 of the second welding tooth 31 smaller than or equal to the width W1 of the welding tooth main body 211, the width of the welding tooth main body 211 of the first welding tooth 21 can be made larger, a sufficient supporting area can be provided for the second welding tooth 31, the contact area between the first welding tooth 21 and the multi-layer foil is made larger, and the compacting effect of the second welding tooth 31 on the multi-layer foil can be further enhanced.

Referring to FIG. 2, in some embodiments, the ratio of W2 to W1 ranges from 0.5 to 0.9.

For example, the ratio of the width W2 of the second tooth 31 to the width W1 of the tooth body 211 may be 0.5, 0.7, 0.9, etc.

In the above technical solution, the ratio of the width W2 of the second welding tooth 31 to the width W1 of the welding tooth main body 211 is not less than 0.5, so that the contact area of the second welding tooth 31 and the multi-layer foil is larger, the compaction range is larger, the compaction effect is better, and the ratio of the width W2 of the second welding tooth 31 to the width W1 of the welding tooth main body 211 is not greater than 0.9, so that a multi-stage welding tooth structure is better formed between the second welding tooth 31 and the first welding tooth 21, and the multi-stage upsetting is more facilitated to the multi-layer foil, and the compaction effect is better.

Referring to fig. 2-3, in some embodiments, the first tooth structure 20 includes a third tooth 23, a plurality of receiving grooves 13 are defined between two adjacent first teeth 21, the plurality of receiving grooves 13 are arranged at intervals along the extending direction of the tooth body 211, the tooth branches 212 are located between two adjacent receiving grooves 13, and the third tooth 23 is located in the receiving groove 13.

For example, the third welding teeth 23 may be accommodated in each accommodation groove 13, or the third welding teeth 23 may be accommodated in part of the accommodation grooves 13.

In the above technical solution, by defining the plurality of accommodating grooves 13 between two adjacent first welding teeth 21, the plurality of accommodating grooves 13 are arranged at intervals along the extending direction of the welding tooth main body 211, and the third welding teeth 23 are disposed in the accommodating grooves 13, the contact area between the first welding tooth structure 20 and the multi-layer foil can be further increased, so that the compaction effect of the third welding teeth 23 can be obtained at the part of the multi-layer foil between the adjacent first welding teeth 21, and the multi-layer foil is compacted uniformly, which is beneficial to improving the welding quality of the subsequent welding process.

Referring to fig. 2-3, in some embodiments, the third tooth 23 is prismoid.

In the above technical solution, the third welding teeth 23 are in a prismatic table shape, so that a larger contact area is formed between the third welding teeth 23 and the multi-layer foil and a better compaction effect is achieved, a welding pier pressing surface is formed on the contact surface of the third welding teeth 23 and the multi-layer foil, a larger heat transfer area is provided, and welding cracks caused by local stress concentration of the multi-layer foil are reduced. ‌ A

Referring to fig. 2-3, in some embodiments, the first tooth structure 20 includes a fourth tooth 24, the fourth tooth 24 is disposed between the first tooth 21 and an edge of the welding surface 11, the fourth tooth 24 is plural, and the fourth teeth 24 on the same side of the first tooth 21 are arranged at intervals along the extending direction of the tooth body 211.

In the above technical solution, the fourth welding teeth 24 are disposed at the edges of the first welding teeth 21 and the welding surface 11, so that the portion of the multi-layer foil located at the edges of the first welding teeth 21 and the welding surface 11 can obtain the compaction effect of the fourth welding teeth 24, so that the multi-layer foil is compacted uniformly, which is beneficial to improving the welding quality of the subsequent welding process, and the fourth welding teeth 24 can reduce the occurrence of the situation that the edges of the first welding teeth 21 scratch the multi-layer foil, and the fourth welding teeth 24 are arranged at intervals along the extending direction of the welding teeth main body 211, so that the compaction of the fourth welding teeth 24 on the multi-layer foil is uniform, and the compaction effect is better.

Referring to fig. 1-7, in a second aspect, the present invention provides an ultrasonic welding apparatus comprising an ultrasonic horn 100 according to an embodiment of the first aspect.

In the above technical solution, by arranging the ultrasonic welding head 100 and adding the second tooth structure 30 on the side of the first tooth structure 20 of the ultrasonic welding head 100 far from the welding surface 11, multi-stage upsetting can be performed on the multi-layer foil, the compaction effect of the whole of the first tooth structure 20 and the second tooth structure 30 on the multi-layer foil welding can be enhanced, the gap between the multi-layer foil can be reduced, the welding quality of the subsequent welding process can be improved, for example, when the subsequent welding process is a laser welding process, the problems of welding defects such as explosion points and collapse generated in the laser welding process can be reduced, welding cracks can be reduced, and the heat dissipation uniformity of the laser welding joint can be improved due to the reduction of the gap between the multi-layer foil, so that the problem of foil cracking caused by overlarge local stress of the foil can be improved; in addition, the second welding teeth 31 are arranged to extend in a strip shape in the extending direction of the welding surface 11, so that the contact length between the second welding tooth structure 30 and the surface of the multi-layer foil material can be increased, the compaction effect on the multi-layer foil material can be further enhanced, the gap between the multi-layer foil material can be further reduced, the welding quality of the subsequent welding process can be further improved, for example, when the subsequent welding process is a laser welding process, the compaction between the multi-layer foil material is tighter and the gap is smaller due to the welding position corresponding to the second welding teeth 31, the laser welding defect can be better reduced, the laser welding quality can be better improved, the laser welding quality of the subsequent electrode lug 42 and the electrode terminal 401 can be better improved when the ultrasonic welding head 100 is used for welding the multi-layer foil material of the electrode lug 42, is beneficial to improving the service stability of the battery.

Referring to fig. 8, in a third aspect, the present invention provides a method for detecting wear of an ultrasonic horn 100, the ultrasonic horn 100 being the ultrasonic horn 100 according to the embodiment of the first aspect, the method for detecting wear of the ultrasonic horn 100 comprising:

Performing ultrasonic pre-welding on a workpiece sample by using an ultrasonic welding head 100, wherein the welding marks corresponding to the second welding teeth 31 on the workpiece sample are second welding marks 45;

identifying a second weld 45 formed on the workpiece sample;

calculating the solder print area of the single second solder print 45;

The abrasion condition of the ultrasonic horn 100 is judged based on the land area of the single second land 45.

Wherein the workpiece sample may be a multi-layer foil.

The second solder marks 45 are solder marks on the workpiece sample corresponding to the second solder teeth 31, and the shape and the area of the second solder marks 45 depend on the shape and the size of the second solder teeth 31. The footprint area of second weld 45 may reflect the wear of second tooth 31 and, thus, of ultrasonic horn 100.

For example, the second weld 45 formed on the workpiece sample may be identified manually or by machine.

In the above technical solution, by calculating the single welding area of the second welding mark 45 formed on the workpiece sample and corresponding to the second welding tooth 31, the abrasion condition of the second welding tooth 31 in the ultrasonic welding head 100 can be intuitively and accurately judged, so that the ultrasonic welding head 100 can be replaced or the ultrasonic welding head 100 can be maintained in time, the conditions of poor welding and poor compacting effect of the multi-layer foil caused by abrasion of the ultrasonic welding head 100 are reduced, the subsequent welding process is influenced, and the compacting effect of the ultrasonic welding head 100 on the multi-layer foil is facilitated to be improved.

In some embodiments, identifying the second weld 45 formed on the workpiece sample includes:

collecting a welding image of one side of a workpiece sample on which welding is formed;

A second weld 45 in the weld image is identified.

For example, a solder print image of the side of the workpiece on which the solder print is formed may be captured by a camera. Wherein the camera may be a CCD camera.

For example, the camera may be calibrated using a calibration plate, the camera pixels converted to actual distances, and the second weld 45 in the weld image may be identified by a software find circle tool.

In the above technical solution, the second solder mark 45 in the solder mark image is identified by collecting the solder mark image on the side where the solder mark is formed on the workpiece sample, so that the second solder mark 45 can be conveniently identified and found.

In some embodiments, calculating the solder print area of a single second solder print 45 includes:

identifying the outer contour of the individual second welds 45;

the area of the pattern enclosed by the outer contour of the second weld 45 is calculated.

The pattern area surrounded by the outer contour of the second solder mark 45 is the solder mark area of the second solder mark 45.

For example, the software uses the distance_pp operator to calculate the area of the pattern enclosed by the outer contour of the second weld 45.

In the above technical solution, by identifying the outer contour of the single second solder mark 45 and then calculating the calculation method of the pattern area surrounded by the outer contour of the second solder mark 45, the solder mark area of the second solder mark 45 can be conveniently calculated, and the calculation mode of the solder mark area is simple and the calculation result is accurate.

In some embodiments, determining the wear of ultrasonic horn 100 based on the footprint area of a single second weld 45 includes:

the abrasion condition of the ultrasonic horn 100 is judged according to the ratio of the welding area of the single second welding mark 45 to the design area of the single second welding mark 45.

The design area of the single second welding mark 45 refers to the welding mark area formed by the second welding teeth 31 on the foil material when the ultrasonic welding head 100 is first tried, and the welding mark area can be obtained by adopting the calculation mode.

During the long-term use of the ultrasonic horn 100, the second welding teeth 31 will be worn gradually, and the welding area of the second welding marks 45 corresponding to the second welding teeth 31 will also be reduced gradually. According to the relation between the welding area of the single second welding mark 45 and the design area of the single second welding mark 45, the abrasion condition of the second welding teeth 31 can be accurately judged, and the abrasion degree of the ultrasonic welding head 100 can also be judged.

In the above technical solution, the amount of reduction of the welding area of the current second welding mark 45 relative to the design area of the second welding mark 45 can be obtained according to the magnitude relation of the ratio of the welding area of the single second welding mark 45 to the design area of the single second welding mark 45, and the amount of reduction of the welding area of the second welding mark 45 relative to the design area of the second welding mark 45 can intuitively reflect the wear condition of the second welding tooth 31, so that the wear condition of the ultrasonic welding head 100 can be reflected, and the accuracy of judging the wear condition of the ultrasonic welding head 100 is facilitated.

In some embodiments, determining the wear condition of ultrasonic horn 100 based on the ratio of the footprint area of the single second footprint 45 to the design area of the single second footprint 45 includes:

the soldering area of the single second soldering 45 is Sx, the design area of the single second soldering 45 is S0, and the lifetime of the ultrasonic horn 100 is judged to be reached when the ratio of Sx to S0 is less than 0.2.

For example, when the ratio of Sx to S0 is 0.3, it is determined that the lifetime of the ultrasonic horn 100 has not been reached, and the ultrasonic horn 100 can be used continuously, and when the ratio of Sx to S0 is 0.18, it is determined that the lifetime of the ultrasonic horn 100 has been reached, and the ultrasonic horn is stopped from being used continuously.

In the above technical solution, by determining whether the ratio of the welding area Sx of the single second welding mark 45 to the design area S0 of the single second welding mark 45 is less than 0.2, it is determined whether the lifetime of the ultrasonic horn 100 has arrived, and it can be simply and accurately determined whether the ultrasonic horn 100 should be replaced or maintained.

Referring to fig. 9, in a fourth aspect, the present invention provides a battery cell 40 including a case 41 and an electrode assembly 46. The case 41 is provided with an electrode terminal 401, the electrode assembly 46 is provided in the case 41 and includes a tab 42, the tab 42 is connected with the electrode terminal 401, the tab 42 includes a plurality of tabs which are stacked and welded, a welding area 43 is formed on the tab 42, the welding area 43 is formed by welding an ultrasonic horn 100 according to the embodiment of the first aspect, the welding area 43 includes a first welding mark 44 and a second welding mark 45, the first welding mark 44 and the second welding mark 45 are both formed into a groove structure, and the second welding mark 45 is formed on the bottom wall of the first welding mark 44 and extends in a long shape.

The housing 41 of the battery cell 40 is typically at least partially made of a metal material, for example, the housing 41 may be an aluminum case or a steel case.

For example, the plurality of tabs may be welded by ultrasonic welding.

The welding area 43 comprises a first welding mark 44 and a second welding mark 45, the first welding mark 44 and the second welding mark 45 are all formed into a groove structure, the second welding mark 45 is formed on the bottom wall of the first welding mark 44 and extends in a strip shape, the multi-layer tab can be compacted by forming the first welding mark 44 and the second welding mark 45, air between the multi-layer tab is discharged, gaps between the multi-layer tab are reduced, and connection between the subsequent tab 42 and the electrode terminal 401 is facilitated.

For example, the region of the weld 43 of the tab may be formed by welding a plurality of tabs by the ultrasonic horn 100 according to the embodiment of the first aspect of the present application, where the region of the weld 43 may correspond to the welding surface 11, the first weld 44 may correspond to the first tooth 21, the second weld 45 may correspond to the second tooth 31, that is, the first tooth 21 of the ultrasonic horn 100 may form the first weld 44 on the tab and the second tooth 31 of the ultrasonic horn 100 may form the second weld 45 on the tab during the welding process.

In the technical scheme, the first welding marks 44 and the second welding marks 45 which are of groove structures are formed on the multi-layer tab pieces of the tab 42 in a welding mode, the multi-layer tab pieces can be compacted in the welding process of the multi-layer tab pieces, air between the multi-layer tab pieces is discharged, gaps between the multi-layer tab pieces are reduced, the problems of explosion points, collapse, welding cracks, tab piece cracking and the like caused by the air between the multi-layer tab pieces in a subsequent welding process are reduced, the second welding marks 45 are formed on the bottom wall of the first welding marks 44 and extend in a strip shape, the second welding marks 45 and the first welding marks 44 can form a multi-stage welding mark structure, the length of the second welding marks 45 is large, in the welding process of the multi-layer tab pieces, the compacting effect on the multi-layer tab pieces can be further enhanced, and therefore the gaps between the multi-layer tab pieces can be further reduced, the welding quality of a subsequent welding process is better facilitated, for example, when the subsequent welding process is a laser welding process, the gaps between the second tab pieces at the position of the second welding marks 45 can be more compact, the laser welding terminal 45 can be better in the welding quality is better, the laser welding terminal is better improved, and the quality of the laser welding terminal is better in the welding quality is better, and the quality of the laser welding terminal is better in the service of the laser welding process is better.

In some embodiments, the first solder mark 44 includes a solder mark body having a long strip shape and a plurality of solder mark branches connected to at least one side of the solder mark body in a width direction, and the second solder mark 45 is formed at a bottom wall of the solder mark body and is consistent with an extending direction of the solder mark body.

For example, the plurality of solder branches may be connected to at least one side of the solder main body in the width direction, or the plurality of solder branches may be connected to both sides of the solder main body in the width direction.

In the above technical scheme, the first welding mark 44 on the tab comprises a welding mark main body and a plurality of welding mark branches, and the welding mark main body is in a strip shape, so that the welding mark area and the welding mark length of the first welding mark 44 can be increased, compaction uniformity and compaction effect on the multilayer tab can be enhanced, and the welding mark length and the welding mark area of the second welding mark 45 can be increased by forming the second welding mark 45 on the bottom wall of the welding mark main body and in accordance with the extending direction of the welding mark main body, so that the compaction effect of the second welding mark 45 on the multilayer tab can be enhanced.

Referring to fig. 7, in some embodiments, the land 43 includes a third bond pad positioned between adjacent first bonds 44.

For example, the third solder mark may be located between adjacent first solder marks 44, and the third solder mark may be located in the middle of two adjacent first solder marks 44.

In the above technical solution, by arranging the third solder marks between the adjacent first solder marks 44, the solder mark area can be further increased, so that the portion of the multi-layer tab located between the adjacent first solder marks 44 can obtain the compaction effect of the third solder marks, thereby enabling the multi-layer tab to be compacted uniformly, and being beneficial to improving the welding quality of the subsequent welding process.

Referring to fig. 7, in some embodiments, the bond pad 43 includes a fourth bond pad located between the first bond pad 44 and the edge of the tab 42.

For example, a fourth weld may be provided between the first weld 44 and the edges of the tab 42.

In the above technical solution, the fourth solder mark is printed on the solder mark area 43 between the first solder mark 44 of the tab 42 and the edge of the tab 42, so that the portion of the multi-layer tab located at the edge of the first solder mark 44 and the tab 42 can obtain the compaction effect of the fourth solder mark, so that the multi-layer tab is compacted uniformly, and the welding quality of the subsequent welding process is improved.

In some embodiments, the multi-layered tab of tab 42 is ultrasonically welded, tab 42 is laser welded to electrode terminal 401 and forms a laser weld, and the laser weld is disposed opposite second weld 45 in the stacking direction of the multi-layered tab.

The ‌ laser welding is a high-efficiency precise welding method for realizing workpiece connection by using a laser beam with high energy density as a heat source and melting materials. ‌ A

In the above technical scheme, the multi-layer tab of the tab 42 is connected by ultrasonic welding, the welding area 43 is formed on the tab 42 by ultrasonic welding, and the welding area 43 comprises the first welding area 44 and the second welding area 45, so that the multi-layer tab can be compacted during ultrasonic welding, the gap between the multi-layer tab is reduced, the tab 42 and the electrode terminal 401 are convenient to be connected by laser welding, the situations of tab explosion point, collapse and the like during laser welding are reduced, the laser welding quality between the tab 42 and the electrode terminal 401 can be improved, and the service stability of the battery is improved.

Referring to fig. 10, in a fifth aspect, the present invention provides a battery device 200, including a case 201 and a battery cell 40 according to the fourth aspect, the battery cell 40 being disposed in the case 201.

In the technical scheme, the battery monomer 40 is arranged, the first welding marks 44 and the second welding marks 45 which are of groove structures are formed by welding on the multi-layer tab pieces of the tab 42, the multi-layer tab pieces can be compacted in the welding process of the multi-layer tab pieces, air between the multi-layer tab pieces is discharged, gaps between the multi-layer tab pieces are reduced, the problems of explosion points, collapse, welding cracks, tab piece cracking and the like caused by the air between the multi-layer tab pieces in the subsequent welding process are reduced, the second welding marks 45 are formed on the bottom wall of the first welding marks 44 and extend in a strip shape, the second welding marks 45 and the first welding marks 44 can form a multi-stage welding mark structure, the length of the second welding marks 45 is larger, in the welding process of the multi-layer tab pieces, the compacting effect on the multi-layer tab pieces can be further enhanced, the gaps between the multi-layer tab pieces can be further reduced, the welding quality of the subsequent welding process can be better improved, for example, the welding quality of the subsequent welding process can be better improved, the laser welding process can be better improved, the laser welding process can be better provided, and the quality of the laser terminal can be better welded at the positions of the tab pieces 45 and the laser terminal can be better welded at the welding terminal, and the quality of the electrode can be better used for the welding.

Referring to fig. 11, in a sixth aspect, the present invention provides an electric device 300 including the battery device 200 of the embodiment of the fifth aspect.

For example, the power consumption device 300 may be a vehicle, and the battery device 200 may be mounted at the bottom of the vehicle body 60.

In the above technical scheme, through the arrangement of the battery device 200, the battery unit 40 arranged in the battery device 200 is welded on the multi-layer tab of the tab 42 to form the first welding mark 44 and the second welding mark 45 which are both of groove structures, in the welding process of the multi-layer tab, the multi-layer tab can be compacted, air between the multi-layer tab is discharged, gaps between the multi-layer tab are reduced, the problems of explosion points, collapse, welding cracks, tab cracking and the like caused by the air between the multi-layer tab in the subsequent welding process are reduced, the second welding mark 45 is formed on the bottom wall of the first welding mark 44 and extends in a strip shape, so that the second welding mark 45 and the first welding mark 44 can form a multi-stage welding mark structure, the length of the second welding mark 45 is larger, in the welding process of the multi-layer tab, the compacting effect on the multi-layer tab can be further enhanced, the gaps between the multi-layer tab can be further reduced, the subsequent welding process can be further improved, for example, the quality of the laser terminal can be better welded at the position of the post-layer tab 45, the laser terminal can be better welded at the position of the post-welding point 45, the laser terminal can be better, the quality of the laser terminal can be better welded at the post-welding point of the post-welding, the laser terminal can be better, and the quality of the laser terminal can be better welded at the post-welding point is better, and the laser terminal can be better welded at the post-welded at the position of the tab 45, and the post-welding point is better at the point.

Ultrasonic horn 100 according to some embodiments of the present invention is described below with reference to fig. 1-7.

In this embodiment, ultrasonic horn 100 includes a horn body 10, a first tooth structure 20, and a second tooth structure 30.

The welding head body 10 has a welding surface 11, the first tooth structure 20 is protruded on the welding surface 11, the second tooth structure 30 is protruded on one side of the first tooth structure far away from the welding surface 11, the second tooth structure 30 includes two second teeth 31 which are arranged at intervals and extend in a strip shape in the extending direction of the welding surface 11, the two second teeth 31 are arranged side by side along the width direction of the second teeth 31, and two ends of the second teeth 31 in the length direction extend to two opposite ends of the welding surface 11 respectively.

The first tooth structure 20 includes a first tooth 21, a third tooth 23 and a fourth tooth 24. Wherein the first teeth 21 include a tooth body 211 extending in an elongated shape in the extending direction of the welding face 11 and tooth branches 212 formed at both sides of the tooth body 211 in the width direction, the third teeth 23 are provided between adjacent first teeth 21, and the fourth teeth 24 are provided between the first teeth 21 and the edge of the welding face 11.

A plurality of accommodating grooves 13 are defined between two adjacent first welding teeth 21, the plurality of accommodating grooves 13 are arranged at intervals along the extending direction of the welding tooth main body 211, the welding tooth branches 212 are positioned between two adjacent accommodating grooves 13, and the third welding teeth 23 are positioned in the accommodating grooves 13 and are in a prismatic table shape.

The fourth welding teeth 24 are disposed between the first welding teeth 21 and the edge of the welding face 11, and the plurality of fourth welding teeth 24 are arranged at intervals along the extending direction of the welding tooth main body 211.

The surface of the first tooth 21, which is far from the welding surface 11, forms a planar tooth end surface 22, the second tooth 31 is disposed in the tooth end surface 22 and is consistent with the extending direction of the tooth main body 211, and the projection of the second tooth 31 on the tooth end surface 22 is disposed in the tooth end surface 22. The cross section of the second welding tooth 31 is a second cross section, the second cross section has a tapered portion, the tapered portion extends to one side of the second welding tooth 31 far away from the welding surface 11, the width of the tapered portion gradually decreases in the direction from the welding surface 11 to the second welding tooth 31, the cross section area of the second welding tooth 31 is the same in the extending direction of the second welding tooth 31, and the cross section of the second welding tooth 31 is arcuate.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.

Claims

1. An ultrasonic welding head, characterized by comprising:

A welding head body, wherein the welding head body has a welding surface;

a first welding tooth structure, the first welding tooth structure being protruding from the welding surface, the first welding tooth structure comprising a first welding tooth, a surface of the first welding tooth away from the welding surface constituting a welding tooth end face, the first welding tooth comprising a welding tooth body and a plurality of welding tooth branches, the welding tooth body extending in an elongated strip shape in the extending direction of the welding surface, the plurality of welding tooth branches being connected to at least one side of the welding tooth body in the width direction;

A second welding tooth structure, the second welding tooth structure is protruding on the side of the first welding tooth structure away from the welding surface, the second welding tooth structure includes at least one second welding tooth, the second welding tooth is arranged on the end face of the welding tooth, the projection of the second welding tooth on the end face of the welding tooth is located within the end face of the welding tooth, the second welding tooth extends in a long strip shape in the extension direction of the welding surface, the second welding tooth is arranged on the welding tooth body and is consistent with the extension direction of the welding tooth body.

2 . The ultrasonic horn according to claim 1 , wherein two ends of the second welding tooth in the length direction extend to opposite ends of the welding surface respectively.

3 . The ultrasonic horn according to claim 1 , wherein the second welding teeth extend along the length direction or the width direction of the welding surface.

The ultrasonic horn according to claim 1 , wherein the second welding teeth extend along a straight line.

The ultrasonic horn according to claim 1 , wherein the second welding teeth are multiple and spaced apart.

6 . The ultrasonic horn according to claim 5 , wherein a plurality of the second welding teeth are arranged side by side along a width direction of the second welding teeth.

7 . The ultrasonic horn according to claim 6 , wherein the second welding teeth extend along the length direction of the welding surface, and a plurality of the second welding teeth are arranged along the width direction of the welding surface.

8 . The ultrasonic welding head according to claim 6 , wherein in the arrangement direction of the plurality of second welding teeth, the interval between two adjacent second welding teeth is d1 , the maximum width of the second welding teeth is W2 , and W2 < d1 .

9 . The ultrasonic horn according to claim 8 , wherein the ratio of W2 to d1 is in the range of 0.2 to 0.8.

10 . The ultrasonic horn according to claim 6 , wherein, in the arrangement direction of the plurality of second welding teeth, the minimum distance between the second welding teeth and the edge of the welding surface is d2 , the maximum width of the second welding teeth is W2 , and d2 > W2 .

11. The ultrasonic welding head according to claim 1 is characterized in that the cross-section of the second welding tooth is a second cross-section, the second cross-section has a tapered portion, the tapered portion extends to the side of the second welding tooth away from the welding surface, and the width of the tapered portion gradually decreases in the direction from the welding surface to the second welding tooth.

12 . The ultrasonic horn according to claim 1 , wherein in the extension direction of the second welding teeth, at least part of the cross-sectional areas of the second welding teeth are the same.

13 . The ultrasonic horn according to claim 1 , wherein the cross section of the second welding tooth is arcuate, circular or elliptical.

14. The ultrasonic welding head according to any one of claims 1 to 13, characterized in that the second welding tooth includes a tooth portion; or the second welding tooth includes a plurality of tooth portions, the surface of the tooth portion away from the welding surface constitutes a tooth portion end face, the plurality of tooth portions are respectively the first tooth portion to the mth tooth portion arranged in sequence along the protruding direction of the second welding tooth, the nth tooth portion is arranged on the tooth portion end face of the (n-1)th tooth portion, the projection of the nth tooth portion on the tooth portion end face of the (n-1)th tooth portion is located within the tooth portion end face of the (n-1)th tooth portion, and 2≤n≤m.

15. The ultrasonic welding head according to claim 1, characterized in that, in the protruding direction of the first welding tooth relative to the welding surface, the tooth height of the first welding tooth is h1, the tooth height of the second welding tooth is h2, and the ratio of h2 to h1 ranges from 0.3 to 0.8.

16 . The ultrasonic welding head according to claim 1 , wherein in a protruding direction of the first welding tooth relative to the welding surface, the tooth height of the first welding tooth is h1 , and the value range of h1 is 0.2 mm to 0.6 mm.

17. The ultrasonic horn according to claim 1, wherein the end surface of the welding tooth is a plane.

18. The ultrasonic welding head according to claim 1 is characterized in that the first welding tooth structure includes a third welding tooth, and the third welding tooth is arranged between adjacent first welding teeth; and/or the first welding tooth structure includes a fourth welding tooth, and the fourth welding tooth is arranged between the first welding tooth and the edge of the welding surface.

19. The ultrasonic horn according to claim 1, wherein the width of the second welding tooth is W2, the width of the welding tooth body is W1, and W2≤W1.

20. The ultrasonic horn according to claim 1, wherein the ratio of W2 to W1 is in the range of 0.5 to 0.9.

21. The ultrasonic welding head according to claim 1 is characterized in that the first welding tooth structure includes a third welding tooth, and a plurality of accommodating grooves are defined between two adjacent first welding teeth, and the plurality of accommodating grooves are arranged at intervals along the extension direction of the welding tooth body, the welding tooth branch is located between two adjacent accommodating grooves, and the third welding tooth is located in the accommodating groove.

22. The ultrasonic horn according to claim 21, wherein the third welding teeth are in a prism shape.

23. The ultrasonic welding head according to claim 1 is characterized in that the first welding tooth structure includes a fourth welding tooth, the fourth welding tooth is arranged between the first welding tooth and the edge of the welding surface, and there are multiple fourth welding teeth, and the multiple fourth welding teeth located on the same side of the first welding tooth are arranged at intervals along the extension direction of the welding tooth body.

24. An ultrasonic welding device, comprising: an ultrasonic welding head according to any one of claims 1 to 23.

25. A battery cell, comprising:

a housing, wherein the housing is provided with electrode terminals;

An electrode assembly, wherein the electrode assembly is arranged in the shell and includes a tab, the tab is connected to the electrode terminal, the tab includes a plurality of tab sheets stacked and welded together, a weld mark area is formed on the tab, the weld mark area is formed by welding with an ultrasonic welding head according to any one of claims 1-23, the weld mark area includes a first weld mark and a second weld mark, the first weld mark and the second weld mark are both formed into a groove structure, and the second weld mark is formed on the bottom wall of the first weld mark and extends in a long strip shape.

26. The battery cell according to claim 25, characterized in that the first weld mark includes a weld mark main body and a plurality of weld mark branches, the weld mark main body is in an elongated strip shape, the plurality of weld mark branches are connected to at least one side of the weld mark main body in the width direction, and the second weld mark is formed on the bottom wall of the weld mark main body and is consistent with the extension direction of the weld mark main body.

27. The battery cell according to claim 25, characterized in that the weld mark area includes a third weld mark, and the third weld mark is located between adjacent first weld marks; and/or the weld mark area includes a fourth weld mark, and the fourth weld mark is located between the first weld mark and the edge of the tab.

28. The battery cell according to any one of claims 25-27, characterized in that the multiple layers of the tab sheets are connected by ultrasonic welding, the tab is connected to the electrode terminal by laser welding to form a laser weld, and the laser weld and the second weld mark are arranged opposite to each other in the stacking direction of the multiple layers of the tab sheets.

29. A battery device, comprising:

Box;

The battery cell according to any one of claims 25 to 28, wherein the battery cell is arranged in the box.

30. An electrical device, comprising the battery device according to claim 29.