CN222995406U - A battery cell pole piece, battery cell, battery, battery pack and electrical equipment - Google Patents

A battery cell pole piece, battery cell, battery, battery pack and electrical equipment Download PDF

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Publication number
CN222995406U
CN222995406U CN202421540815.4U CN202421540815U CN222995406U CN 222995406 U CN222995406 U CN 222995406U CN 202421540815 U CN202421540815 U CN 202421540815U CN 222995406 U CN222995406 U CN 222995406U
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China
Prior art keywords
pole piece
tab
battery
battery cell
region
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Active
Application number
CN202421540815.4U
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Chinese (zh)
Inventor
苏汉卿
刘舜尧
邢文清
刘猛
张彦雄
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BYD Co Ltd
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BYD Co Ltd
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Priority to CN202421540815.4U priority Critical patent/CN222995406U/en
Priority to PCT/CN2025/087831 priority patent/WO2026007488A1/en
Application granted granted Critical
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

本申请公开了一种电芯极片、电芯、电池、电池包及用电设备，该电芯极片包括：基材，包括极耳区域和涂敷区域，其中，极耳区域沿第一方向位于涂敷区域的一侧；嫁接件，自电芯极片的沿第一方向的端部朝向所述涂敷区域覆盖极耳区域的至少一个表面的至少部分区域。本申请的方案中的嫁接件自电芯极片的沿第一方向的端部朝向涂敷区域覆盖极耳区域的至少一个表面的至少部分区域，并与极耳区域构成极耳，能够增加极耳的过流面积，进而能够降低极耳的内阻并提高极耳的过流能力，有效改善了极耳在快充时的温升过高的问题。

The present application discloses a battery cell pole piece, a battery cell, a battery, a battery pack and an electrical device, wherein the battery cell pole piece comprises: a substrate, including a pole lug region and a coating region, wherein the pole lug region is located on one side of the coating region along a first direction; a grafting member, covering at least a portion of at least one surface of the pole lug region from the end of the battery cell pole piece along the first direction toward the coating region. The grafting member in the scheme of the present application covers at least a portion of at least one surface of the pole lug region from the end of the battery cell pole piece along the first direction toward the coating region, and forms a pole lug with the pole lug region, which can increase the current flow area of the pole lug, thereby reducing the internal resistance of the pole lug and improving the current flow capacity of the pole lug, effectively improving the problem of excessive temperature rise of the pole lug during fast charging.

Description

Battery cell pole piece, battery cell, battery pack and electric equipment
Technical Field
The application relates to the technical field of batteries, in particular to a battery core pole piece, a battery core, a battery pack and electric equipment.
Background
With the continuous acceleration of life pace, it is expected that electronic products can be charged in a shorter time to obtain a higher frequency of use and better practical experience, which puts higher demands on the quick-charging performance of batteries.
However, the tab of the battery cell pole piece in the related art is generally a single-layer foil, the thickness is thinner, the overcurrent area of the tab is smaller, the temperature rise of the tab is too high when the battery is quickly charged, the quick charging performance of the battery cannot meet the market demand, and the service life and the safety performance of the battery can be influenced.
Disclosure of utility model
In the summary, a series of concepts in a simplified form are introduced, which will be further described in detail in the detailed description. The summary of the utility model is not intended to define the key features and essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
In view of the problems existing at present, an aspect of the present utility model provides an electrical core pole piece, including:
A substrate comprising a tab region and a coating region, wherein the tab region is located on one side of the coating region along a first direction;
And the grafting piece covers at least part of the surface of the tab area from the end part of the battery cell pole piece along the first direction to the coating area.
Illustratively, the graft is welded to the tab region.
Illustratively, the graft covers at least a portion of one surface of the tab region and is welded to the tab region by at least one weld, or
The grafting piece is integrally in a U-shaped structure, covers at least part of the end part of the battery cell pole piece along the first direction and two surfaces of the tab area, and is welded with the tab area through at least one welding seam;
wherein the weld extends along a second direction, the second direction being perpendicular to the first direction.
The grafting piece is welded with the tab area through a plurality of welding seams which are arranged at intervals along the first direction.
Illustratively, the width of the weld along the first direction is greater than or equal to 1mm.
Illustratively, the weld is made by an ultrasonic roll welding process.
Illustratively, a coating is also included that covers at least one surface of the coated area of the substrate.
Illustratively, the thickness of the graft on the surface of the tab region is less than or equal to the thickness of the coating on the surface of the same side as the coating region.
The battery cell pole piece is an anode pole piece, the base material is a smooth aluminum foil, the coating is an anode active material coating, or
The battery cell pole piece is a negative pole piece, the base material is a smooth copper foil, and the coating is a negative active material coating.
Illustratively, when the battery cell electrode sheet is the positive electrode sheet, the grafting piece is a polished aluminum foil;
When the electrode plate is the negative electrode plate, the grafting piece is a smooth copper foil.
The application further provides an electric core, which comprises a positive electrode plate, a negative electrode plate and an isolation layer, wherein the isolation layer is arranged between the positive electrode plate and the negative electrode plate, and at least one of the positive electrode plate and the negative electrode plate comprises the electric core plate.
The positive pole piece, the negative pole piece and the isolating layer are wound to form a wound cell, or
The positive pole piece, the negative pole piece and the isolation layer are laminated to form a laminated cell.
The application further provides a battery, which comprises a shell, a cover plate and the battery cell, wherein the shell and the cover plate enclose an accommodating space, and the battery cell is accommodated in the accommodating space.
Another aspect of the present application provides a battery pack including the above battery.
Another aspect of the application provides an electrical device comprising the battery described above, or comprising the battery pack described above.
According to the battery cell pole piece, the battery cell, the battery pack and the electric equipment, the grafting piece in the battery cell pole piece covers at least part of the surface of the tab area from the end part of the battery cell pole piece along the first direction towards the coating area and forms the tab with the tab area, so that the internal resistance of the tab can be reduced, the overcurrent capacity of the tab can be improved, and the problem of overhigh temperature rise of the tab during quick charge can be effectively solved.
Drawings
The above and other objects, features and advantages of the present application will become more apparent by describing embodiments of the present application in more detail with reference to the attached drawings. The accompanying drawings are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate the application and together with the embodiments of the application, and not constitute a limitation to the application. In the drawings, like reference numerals generally refer to like parts or steps.
Fig. 1A shows a schematic structural diagram of a related art battery cell;
Fig. 1B shows a schematic structure of a related art battery cell wound with a wound battery cell;
FIG. 2 is a schematic diagram of a cell pole piece according to an embodiment of the present application;
FIG. 3 illustrates a view of the cell pole piece of FIG. 2 along the A-A direction in accordance with an embodiment of the present application;
FIG. 4 shows an enlarged schematic view of the area of FIG. 3 in accordance with an embodiment of the application;
Fig. 5 shows a schematic structural diagram of a core electrode sheet according to another embodiment of the present application;
FIG. 6 shows a view of the cell pole piece of FIG. 5 along the A-A direction in accordance with an embodiment of the present application;
FIG. 7 shows an enlarged view of the area of FIG. 6 in accordance with an embodiment of the present application
Fig. 8 is a schematic diagram showing a structure of a wound battery cell in which a battery cell pole piece according to an embodiment of the present application is wound.
Reference numerals:
110-substrate, 120-coating, 210-substrate;
220-grafting pieces, 230-coating layers and 240-welding seams.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the application may be practiced without one or more of these details. In other instances, well-known features have not been described in detail in order to avoid obscuring the application.
It should be understood that the present application may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art. In the drawings, the size of layers and regions, as well as the relative sizes, may be exaggerated for clarity. Like numbers refer to like elements throughout.
It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present application.
Spatially relative terms, such as "under," "below," "beneath," "under," "above," "over," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use and operation in addition to the orientation depicted in the figures.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of the associated listed items.
In the related art, as shown in fig. 1A and 1B, the electrode tab in the battery generally includes a substrate 110 and a coating layer 120, the substrate 110 includes a coating region and a tab region, the tab region is located at one side of the coating region along the first direction, the coating layer 120 covers two surfaces of the coating region of the substrate, the tab region is just used as the tab of the electrode tab, which is equivalent to the tab of the electrode tab in the related art, which is a single-layer substrate, and has a thinner thickness, and the overcurrent area of the tab is smaller, so that the temperature rise of the tab is too high when the battery is quickly charged, further, the quick charging performance of the battery cannot meet the market demand, and the service life and the safety performance of the battery can be affected.
It should be noted that, although the tab region is located on both sides of the coating region in the first direction in the battery cell sheet shown in fig. 1A and 1B, this is an intermediate product produced for improving the production efficiency, and in the battery cell sheet actually used in the battery, the tab region is located on one side of the coating region in the first direction. Taking the example of winding the battery cell pole piece into a winding type battery cell shown in fig. 1B, the battery cell pole piece is wound into a winding type battery cell along a direction perpendicular to the first direction, after winding is completed, the winding type battery cell is cut to form two battery cells symmetrically arranged along the first direction, and a tab area of the battery cell pole piece in each battery cell is located at one side of the coating area along the first direction.
In view of the above technical problems, the utility model provides a battery cell pole piece, a battery cell, a battery pack and electric equipment to solve the above problems.
An exemplary embodiment of a battery cell according to the present application will be described with reference to fig. 2 to 7. As shown in fig. 2 to 7, the battery cell electrode sheet of the present application includes a base material (may also be referred to as a current collector) 210 and a graft 220, wherein the base material 210 includes a tab region and a coating region, the tab region is located at one side of the coating region in a first direction, and the graft 220 covers at least a partial region of at least one surface of the tab region from an end of the battery cell electrode sheet in the first direction toward the coating region. The tab region of the substrate 210 and the grafting piece 220 together form a tab of the electrode tab. Illustratively, the first direction may be a length direction or a width direction of the cell pole piece, which is not limited by the present application.
It should be noted that, although the structure of the electrode tab shown in fig. 2 and 5 is such that the tab region is located at both sides of the coating region along the first direction, this is an intermediate product produced for improving the production efficiency, and in the electrode tab actually used for the battery, the tab region is located at one side of the coating region along the first direction, which corresponds to two electrode tabs symmetrical in the first direction after manufacturing the electrode tab shown in fig. 2 and 5, the tab region in each electrode tab is located at one side of the coating region along the first direction, or after manufacturing the wound electrode tab shown in fig. 8, the tab region in each electrode tab is located at one side of the coating region along the first direction.
In the above scheme, the tab of the battery cell electrode plate is equivalent to the tab area of the base material, the grafting piece is additionally arranged on the tab area of the base material, the outer end part of the tab along the first direction is connected with the cover plate of the battery to realize current circulation, and the grafting piece covers at least part of the area of at least one surface of the tab area from the end part of the battery cell electrode plate along the first direction towards the coating area, so that the contact area connected with the cover plate can be increased on the basis of the original tab area, namely the overcurrent area of the tab can be increased, the internal resistance of the tab can be reduced, the overcurrent capacity of the tab can be improved, and the problem of overhigh temperature rise of the tab during quick charging can be effectively solved.
In one example, as shown in fig. 2-7, the battery cell pole piece of the present application further includes a coating 230, the coating 230 covering at least one surface of the coated area of the substrate 210. Preferably, the coating 230 covers both surfaces of the coated area.
In one example, the cell electrode sheet may be a positive electrode sheet or a negative electrode sheet, where the substrate 210 is a glossy aluminum foil and the coating 230 is a positive active material coating, and where the cell electrode sheet is a negative electrode sheet, the substrate 210 is a bright copper foil and the coating 230 is a negative active material coating. Illustratively, the substrate 210 may be any other suitable material, which is not limited in this regard by the present application.
Specifically, the material of the positive electrode active material coating layer may be lithium-containing phosphate of olivine structure, lithium transition metal oxide and their respective modified compounds. The olivine structured lithium-containing phosphate may include, but is not limited to, at least one of lithium iron phosphate (e.g., liFePO 4 (which may also be referred to simply as LFP)), a composite of lithium iron phosphate and carbon, lithium manganese phosphate (e.g., liMnPO 4), a composite of lithium manganese phosphate and carbon, lithium manganese phosphate, a composite of lithium manganese phosphate and carbon, but is not limited to the above examples. The material of the anode active material coating may be at least one of artificial graphite, natural graphite, mesophase carbon microspheres, hard carbon, soft carbon, silicon oxygen, silicon carbon, and silicon alloy, but is not limited to the above examples.
In one example, when the battery pole piece is a positive pole piece, the grafting piece 220 is a smooth aluminum foil, and when the battery pole piece is a negative pole piece, the grafting piece 220 is a smooth copper foil. Preferably, the grafting piece 220 is made of the same material as the base material of the electrode plate. Illustratively, the grafting material may be any other suitable material, which is not limited in the present application.
In one example, the grafting 220 is welded to the tab area.
In one example, as shown in fig. 2 to 4, the grafting 220 covers an end of the battery cell pole piece in the first direction and covers at least a partial region of both surfaces of the tab region in a U-shaped structure as a whole, and is welded to the tab region by at least one weld 240. Illustratively, the graft 220 should cover at least a partial region of each of the two surfaces of the tab region. Illustratively, since the grafting piece 220 is integrally formed in a U-shaped structure, the grafting piece is naturally and firmly connected with the end of the electrode tab, so that at least one welding seam is required to firmly weld the grafting piece 220 with the tab region. Illustratively, the weld should be near the end of the U-shaped structure graft 220 that is distal from the end of the cell pole piece.
In another example, as shown in fig. 5 to 7, the grafting 220 covers at least a partial region of one surface of the tab region and is welded to the tab region by at least one weld 240. Illustratively, the graft 220 covers at least a partial area of one surface of the tab region from the end of the cell pole piece in the first direction toward the coating region.
In one example, grafting piece 220 is welded to the tab area by a plurality of welds 240 spaced apart along the first direction. When the grafting piece 220 covers at least a part of one surface of the tab area, since the grafting piece 220 covers only at least a part of one surface of the tab area, the grafting piece 220 is not naturally fastened to the end of the battery cell pole piece, and if only one welding seam 240 is provided, the area of the grafting piece 220 far away from the welding seam 240 is liable to have curling, wrinkling, etc. problems, and preferably a plurality of welding seams 240 are required to firmly weld the grafting piece 220 to the tab area when the grafting piece 220 covers at least a part of one surface of the tab area.
In one example, whether the grafting piece 220 only covers at least part of one surface of the tab area, or at least part of two surfaces of the tab area is covered by the grafting piece 220, the grafting piece 220 extends from the end part of the electrode plate along the first direction towards the coating area to cover the tab area, in the battery where the electrode plate is located, the end part of the electrode plate, along the first direction, where the tab area is formed, is connected with an external circuit, and the grafting piece 220 is welded and connected at the end part to form the tab, so that the contact area of the end part of the tab connected with the external circuit can be effectively increased, the internal resistance of the tab can be reduced, the overcurrent area of the tab is increased, and the problem that the temperature rise of the tab is too high when the battery is charged quickly is effectively solved.
In one example, the welds 240 described above each extend in a second direction that is perpendicular to the first direction. For example, if the first direction is the length direction of the battery cell pole piece, the second direction is the width direction of the battery cell pole piece, and if the first direction is the width direction of the battery cell pole piece, the second direction is the length direction of the battery cell pole piece.
In one example, the width of the weld 240 in the first direction described above is greater than or equal to 1mm, e.g., the width of the weld 240 in the first direction may be 1mm, 2mm, 4mm, 5.5mm, etc. Preferably, the width of weld 240 in the first direction ranges from 2mm to 5mm, e.g., 2mm, 3mm, 3.5mm, 4mm, 5mm, etc.
In one example, weld 240 described above is made by an ultrasonic roll welding process. In other embodiments, weld 240 may also be made by various welding processes conventional in the art, as the application is not limited in this regard.
In one example, the thickness of the graft 220 on the surface of the tab region should be less than or equal to the thickness of the coating 230 on the surface of the same side as the coating region to prevent the battery cell from being fabricated into a battery cell, such as being wound into a wound battery cell, due to the graft 220 having a thickness greater than the coating 230.
The description of the structure of the battery cell pole piece is completed, and the complete battery cell pole piece may also comprise other composition structures, which are not described in detail herein.
In summary, the grafting piece in the battery cell pole piece covers at least part of the surface of the tab area from the end part of the battery cell pole piece along the first direction towards the coating area, and forms the tab with the tab area, so that the internal resistance of the tab can be reduced, the overcurrent capacity of the tab can be improved, the problem of overhigh temperature rise of the tab during quick charge can be effectively solved, the safety of the battery where the battery cell pole piece is positioned can be improved, and the service life of the battery can be prolonged.
The embodiment of the application also provides a battery cell, which comprises the positive electrode plate, the negative electrode plate and the isolation layer, wherein at least one of the positive electrode plate and the negative electrode plate comprises the battery cell plate. The isolating layer is arranged between the positive pole piece and the negative pole piece and is used for preventing the positive pole piece and the negative pole piece from being in direct contact to cause short circuit. Illustratively, pores for movement of ions are formed in the separator layer, the coating of the positive electrode sheet, and the coating of the negative electrode sheet.
In one example, as shown in fig. 8, the positive electrode tab, the negative electrode tab, and the separator are wound as a wound cell, more specifically, the positive electrode tab, the negative electrode tab, and the separator are wound as a wound cell in a direction perpendicular to the first direction, or the positive electrode tab, the negative electrode tab, and the separator are laminated as a laminated cell. It should be noted that fig. 8 shows an intermediate product of a wound cell formed for improving efficiency, and after the wound cell shown in fig. 8 is manufactured, the cell electrode sheet is further cut into two cells symmetrical along the first direction, and the tab region in the cell electrode sheet of each cell is located at one side of the coating region along the first direction. The tabs of the positive pole piece and the tabs of the negative pole piece in the wound cell and the laminated cell are located on the same side. Illustratively, before the positive pole piece, the negative pole piece and the isolating layer are wound or laminated, the method further comprises the step of die cutting the tab of the positive pole piece and the tab of the negative pole piece to remove part of the tab so that the shape of the tab meets the requirement. Illustratively, the method further comprises the step of slitting the positive electrode sheet, the negative electrode sheet and the separator before winding or laminating the positive electrode sheet, the negative electrode sheet and the separator.
In one example, taking the winding of the positive electrode plate, the negative electrode plate and the isolation layer as winding type battery cells, and taking the negative electrode plate as the battery cell electrode plate, in the manufacturing process, firstly providing a conventional negative electrode plate, namely providing the negative electrode plate only comprising a base material and a coating, simultaneously providing a grafting piece, then welding the grafting piece with the tab area of the base material, and finally winding or laminating the welded negative electrode plate, the positive electrode plate and the isolation layer.
In one example, the shape of the cell may be a short cell or a long cell with a thin thickness, or may be a rectangular block cell with a slightly thick thickness, and the rectangular block cell may be a square aluminum case cell, for example. The shape of the cell can also be a cylindrical cell.
The description of the structure of the battery cell of the present utility model is completed, and the complete battery cell may also include other constituent structures, which are not described in detail herein.
In summary, at least one of the positive electrode plate and the negative electrode plate of the battery cell comprises the battery cell electrode plate, the grafting piece in the battery cell electrode plate covers at least part of the surface of the tab area from the end part of the battery cell electrode plate along the first direction towards the coating area and forms the tab with the tab area, so that the internal resistance of the tab can be reduced, the overcurrent capacity of the tab can be improved, the problem of overhigh temperature rise of the tab during quick charge can be effectively solved, the safety of the battery where the battery cell is positioned can be improved, and the service life of the battery can be prolonged.
The embodiment of the application also provides a battery, which comprises the battery core, and the shell and the cover plate, wherein the shell and the cover plate enclose an accommodating space, and the battery core is accommodated in the accommodating space.
In one example, the tab in the battery core pole piece is generally connected with the cover plate to realize electric connection with an external circuit, but the tab in the battery core pole piece is formed by the tab area of the original base material and the grafting piece welded and connected together, so that the contact area of the tab and the cover plate can be effectively increased, the internal resistance of the tab can be further reduced, the overcurrent capacity of the tab can be improved, the problem of overhigh temperature rise of the tab during quick charge can be effectively solved, the safety of the battery can be improved, and the service life of the battery can be prolonged.
In one example, multiple layers of cells are provided in a battery, with exhaust channels provided between cells of any adjacent layer. Illustratively, the vent channels can be used to prevent gas from accumulating inside the cell between the cells, thereby avoiding safety issues such as swelling, cracking, or even explosion of the cell. The vent channels are illustratively disposed within a cross or stringer between the cells of adjacent layers.
In one example, a cold plate is further arranged at the top and/or bottom of the battery cell, and the cold plate is adhered to the battery cell through the heat conducting structural adhesive and used for controlling the temperature of the battery cell.
The description of the structure of the battery of the present utility model is completed, and the complete battery may further include other constituent structures, which are not described in detail herein.
The embodiment of the application also provides a battery pack comprising the battery. For example, the complete battery pack may further include other constituent structures, which are not described in detail herein.
The embodiment of the utility model also provides electric equipment, which comprises the battery or the battery pack. The electric equipment comprises electric vehicles, hybrid electric vehicles, industrial equipment and the like, and the electric equipment is within the protection scope of the utility model.
Although the illustrative embodiments have been described herein with reference to the accompanying drawings, it is to be understood that the above illustrative embodiments are merely illustrative and are not intended to limit the scope of the present application thereto. Various changes and modifications may be made therein by one of ordinary skill in the art without departing from the scope and spirit of the application. All such changes and modifications are intended to be included within the scope of the present application as set forth in the appended claims.
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the application may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in order to streamline the utility model and aid in understanding one or more of the various inventive aspects, various features of the utility model are sometimes grouped together in a single embodiment, figure, or description thereof in the description of exemplary embodiments of the utility model. This method of disclosure, however, is not to be interpreted as reflecting an intention that the claimed utility model requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this utility model.
It will be understood by those skilled in the art that all of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or units of any method or apparatus so disclosed, may be combined in any combination, except combinations where the features are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.
It should be noted that the above-mentioned embodiments illustrate rather than limit the application, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims.

Claims (15)

1. An electrical core pole piece, comprising:
A substrate comprising a tab region and a coating region, wherein the tab region is located on one side of the coating region along a first direction;
And the grafting piece covers at least part of the surface of the tab area from the end part of the battery cell pole piece along the first direction to the coating area.
2. The battery cell pole piece of claim 1, wherein the grafting piece is welded to the tab region.
3. The electrode tab of claim 2 wherein the graft covers at least a portion of one surface of the tab region and is welded to the tab region by at least one weld, or
The grafting piece is integrally in a U-shaped structure, covers at least part of the end part of the battery cell pole piece along the first direction and two surfaces of the tab area, and is welded with the tab area through at least one welding seam;
wherein the weld extends along a second direction, the second direction being perpendicular to the first direction.
4. The battery cell sheet of claim 3 wherein the graft is welded to the tab region by a plurality of welds spaced apart along the first direction.
5. The cell pole piece of claim 3, wherein the width of the weld along the first direction is greater than or equal to 1mm.
6. The cell pole piece of claim 3, wherein the weld is made by an ultrasonic roll welding process.
7. The battery cell pole piece of claim 1, further comprising a coating covering at least one surface of the coated region of the substrate.
8. The battery cell pole piece of claim 7, wherein the thickness of the graft on the surface of the tab region is less than or equal to the thickness of the coating on the surface of the same side as the coating region.
9. The cell pole piece of claim 7, wherein the electrode is formed from a material selected from the group consisting of,
The electrode sheet is a positive electrode sheet, the base material is a smooth aluminum foil, and the coating is a positive electrode active material coating, or
The battery cell pole piece is a negative pole piece, the base material is a smooth copper foil, and the coating is a negative active material coating.
10. The battery cell pole piece of claim 9, wherein when the battery cell pole piece is the positive pole piece, the grafting piece is a polished aluminum foil;
When the electrode plate is the negative electrode plate, the grafting piece is a smooth copper foil.
11. An electrical core, comprising a positive electrode sheet, a negative electrode sheet and an isolation layer, wherein the isolation layer is disposed between the positive electrode sheet and the negative electrode sheet, and wherein at least one of the positive electrode sheet and the negative electrode sheet comprises the electrical core sheet of any one of claims 1-10.
12. The cell of claim 11, wherein the positive electrode sheet, the negative electrode sheet, and the separator are wound as a wound cell, or
The positive pole piece, the negative pole piece and the isolation layer are laminated to form a laminated cell.
13. A battery comprising a housing, a cover plate and the cell of any one of claims 11-12, wherein the housing and the cover plate enclose an accommodation space, and the cell is disposed in the accommodation space.
14. A battery pack comprising the battery of claim 13.
15. A powered device comprising the battery of claim 13 or comprising the battery pack of claim 14.
CN202421540815.4U 2024-07-01 2024-07-01 A battery cell pole piece, battery cell, battery, battery pack and electrical equipment Active CN222995406U (en)

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CN202421540815.4U CN222995406U (en) 2024-07-01 2024-07-01 A battery cell pole piece, battery cell, battery, battery pack and electrical equipment
PCT/CN2025/087831 WO2026007488A1 (en) 2024-07-01 2025-04-08 Battery cell electrode sheet, battery cell, battery, battery pack, and electric device

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JP5358380B2 (en) * 2009-09-30 2013-12-04 日立ビークルエナジー株式会社 Flat rechargeable secondary battery
CN107671414B (en) * 2017-09-04 2020-09-15 中航锂电（洛阳）有限公司 Ultrasonic welding method and welding protection method for lithium ion battery tab
JP2020166973A (en) * 2019-03-28 2020-10-08 Fdk株式会社 Power storage device and manufacturing method of power storage device
CN112952034B (en) * 2021-03-03 2023-06-02 珠海冠宇动力电池有限公司 Lithium ion battery core and lithium ion battery adopting same
CN214848701U (en) * 2021-03-26 2021-11-23 厦门海辰新能源科技有限公司 Pole piece and cylindrical battery roll core structure
CN114171718B (en) * 2021-11-01 2024-03-19 浙江锋锂新能源科技有限公司 A method for preparing pole pieces of composite foil current collectors, pole pieces and soft pack batteries
CN116137315A (en) * 2021-11-17 2023-05-19 北京小米移动软件有限公司 Cell pole pieces, winding cells and batteries
CN217062165U (en) * 2022-03-21 2022-07-26 珠海冠宇电池股份有限公司 Pole piece and battery
CN217903384U (en) * 2022-08-11 2022-11-25 楚能新能源股份有限公司 Lithium ion battery tab
CN116031588A (en) * 2022-12-30 2023-04-28 上海空间电源研究所 A welding method for a flexible current collector

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