CN222995751U

CN222995751U - Sodium cylindrical battery

Info

Publication number: CN222995751U
Application number: CN202421519733.1U
Authority: CN
Inventors: 杨维元; 王洪; 李荐; 许铁; 贾建民; 吴静; 黎同婕; 杨春兰
Original assignee: Shenzhen Jinna Technology Co ltd
Current assignee: Shenzhen Jinna Technology Co ltd; Yang Weiyuan
Priority date: 2024-06-28
Filing date: 2024-06-28
Publication date: 2025-06-17
Anticipated expiration: 2034-06-28

Abstract

The application provides a sodium cylindrical battery, and relates to the technical field of batteries. The sodium cylindrical battery comprises a shell, a first current collecting disc and a positive pole post are arranged at the first end part of the shell, a second current collecting disc and a negative pole post are arranged at the second end part of the shell, the first current collecting disc and the second current collecting disc comprise disc bodies, the disc bodies comprise a first end face and a second end face, a groove is arranged on the first end face, the concave direction of the groove faces to the second end face, a protrusion is formed on the second end face of the groove, the second end face is opposite to a lug in the shell, the protrusion is used for being attached to the lug, a plurality of disjoint welding areas are arranged in the groove, the welding areas are in a curve shape, the welding areas extend from the first side of the groove to the second side, and the welding areas are used for being connected with the lug in a welding mode. When welding is carried out in the groove, the occurrence of false welding can be effectively avoided, and the strength and the reliability of the connection between the disk body and the tab are ensured through a plurality of curved welding areas in the groove.

Description

Sodium cylindrical battery

Technical Field

The application relates to the technical field of batteries, in particular to a sodium cylindrical battery.

Background

The sodium cylindrical battery has the advantages of large capacity, long service life, no memory effect, environmental protection and the like.

The sodium cylindrical battery comprises a cylindrical shell and an inner core arranged in the shell, wherein a positive lug is arranged on a positive plate of the inner core, and a negative lug is arranged on a negative plate of the inner core. The positive lugs and the positive posts and the negative lugs and the negative posts are fixedly connected through the current collecting disc. When the current collecting plate is fixed, welding is generally performed along the outer edge of the current collecting plate, so that the current collecting plate is fixedly connected with the corresponding tab.

Due to assembly errors or dimensional errors of the collector plate, a certain gap exists between the outer edge of the collector plate and the tab. If the gap is large, a cold joint may occur, thereby affecting the strength and reliability of the connection between the current collecting plate and the tab.

Disclosure of utility model

The application aims to overcome the defects of the prior art and provides a sodium cylindrical battery which is used for solving the problems in the prior art.

In order to solve the problems, the embodiment of the application provides a sodium cylindrical battery, which comprises a shell, wherein the shell comprises a first end part and a second end part, the first end part is provided with a first current collecting disc and a positive pole post which are fixedly connected, and the second end part is provided with a second current collecting disc and a negative pole post which are fixedly connected;

The first current collecting disc and the second current collecting disc comprise disc bodies, wherein the disc bodies comprise a first end face and a second end face which are respectively arranged at two ends in the thickness direction of the disc bodies, a groove is formed in the first end face, the concave direction of the groove faces towards the second end face, a protrusion is formed on the second end face of the groove, the second end face is arranged opposite to a lug in the shell, and the protrusion is used for being attached to the lug;

the first side of the groove extends towards the center of the tray body, and the second side extends towards the outer edge of the tray body;

The groove is internally provided with a plurality of non-intersecting welding areas, the welding areas are curved, the welding areas extend from the first side to the second side of the groove, and the welding areas are used for being welded and connected with the pole lugs.

In one possible implementation manner, the disc body is provided with a central hole;

The disc body is provided with a plurality of grooves which are distributed in an annular array with respect to the central hole, wherein middle through holes are formed between two adjacent grooves, the number of the grooves is 4-10, and the welding areas are in wavy shapes.

In one possible embodiment, the positive electrode post comprises a first post and a first base which are connected, wherein the cross-sectional area of the first post is smaller than that of the first base, the first post is inserted into the central hole of the first current collecting disc, and the first post part penetrates through the central hole of the first current collecting disc;

The negative pole post comprises a second post body and a second base which are connected, wherein the cross section area of the second post body is smaller than that of the second base, the second post body is inserted into the central hole of the second current collecting disc, the second post body part penetrates through the central hole of the second current collecting disc, and the cross section area of the second base is larger than that of the central hole of the second current collecting disc.

In one possible implementation manner, the positive electrode post is provided with a liquid injection hole, and the liquid injection hole penetrates through the first column body and the first base.

In a possible embodiment, the peripheral surface of the first cylinder is welded with the inner wall or/and the outer edge of the central hole of the first collecting disc;

The peripheral surface of the second cylinder is welded with the inner wall or/and the outer edge of the central hole of the second collecting disc.

In one possible embodiment, the first collecting tray is covered with a first end cover, and the first end cover is fixedly connected with the shell;

the second collecting disc is covered with a second end cover which is fixedly connected with the shell;

The first end cover and the second end cover both comprise cover bodies, and the outer edges of the cover bodies are welded with the shell.

In one possible embodiment, an explosion-proof valve is disposed on each of the first end cap and the second end cap.

In one possible embodiment, the cover is provided with a mounting through hole;

the positive pole post part is inserted into the mounting through hole of the first end cover;

the negative pole post part is inserted into the mounting through hole of the second end cover.

In one possible embodiment, the peripheral surface of the positive electrode pole is welded with the inner wall or/and the outer edge of the mounting through hole of the first end cover;

The peripheral surface of the negative electrode pole column is welded with the inner wall or/and the outer edge of the mounting through hole of the second end cover.

In one possible implementation mode, the outer edge of the installation through hole is provided with a convex ring, the convex ring is arranged around the installation through hole, at least one side of the cover body is provided with the convex ring, and the inner diameter of the convex ring is identical to the inner diameter of the installation through hole.

The beneficial effects of the application include:

The first end face of the tray body is provided with a groove, wherein the concave direction of the groove faces the second end face, and the groove is provided with a protrusion on the second end face. When assembling, the second terminal surface sets up with the utmost point ear in the casing relatively, owing to bellied existence, even second terminal surface or utmost point ear are uneven, in certain error range, can both guarantee protruding and utmost point ear laminating mutually, and for this reason, when welding in the recess, can effectively avoid the appearance of rosin joint.

The groove is internally provided with a plurality of disjoint welding areas, the welding areas are in a curve shape, the welding areas extend from the first side of the groove to the second side, and the welding areas are used for being welded with the electrode lugs. Through the welding area of many curved, ensured intensity and reliability of being connected between disk body and the utmost point ear.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 shows a schematic diagram of a sodium cylindrical battery;

fig. 2 shows an exploded view of a sodium cylindrical battery;

FIG. 3 shows a schematic view of a tray;

FIG. 4 shows a second schematic view of the tray of FIG. 3;

FIG. 5 shows a front view of the tray of FIG. 3;

FIG. 6 shows a side view of FIG. 5;

FIG. 7 shows a schematic view of a positive electrode post;

FIG. 8 shows a schematic view of a negative electrode post;

fig. 9 shows a schematic view of a cover.

Description of main reference numerals:

100-a shell, 101-a first end part, 102-a second end part, 110-a lug, 210-a first current collecting disc, 220-a positive pole column, 221-a first column, 222-a first base, 223-a liquid injection hole, 310-a second current collecting disc, 320-a negative pole column, 321-a second column, 322-a second base, 400-a disc body, 401-a central hole, 410-a first end face, 411-a groove, 4111-a welding area, 420-a second end face, 421-a bulge, 430-a middle through hole, 510-a first end cover, 520-a second end cover, 530-a cover body, 531-a mounting through hole and 532-a convex ring.

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the application.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Welding as referred to herein includes laser welding and the like.

Examples

As shown in fig. 1 and 2, a sodium cylindrical battery is proposed, comprising a housing 100, the housing 100 comprising a first end 101 and a second end 102. The housing 100 is a hollow structure, the inside of which is used to fill the core.

The first end 101 is provided with a fixedly connected first current collecting disc 210 and positive electrode post 220, and the second end 102 is provided with a fixedly connected second current collecting disc 310 and negative electrode post 320.

The first current collecting tray 210 and the second current collecting tray 310 each include a tray body 400. In the present embodiment, the structures of both the first current collecting plate 210 and the second current collecting plate 310 are the same.

As shown in fig. 3 to 6, the tray 400 includes a first end surface 410 and a second end surface 420 which are disposed at both ends in the thickness direction thereof. The first end surface 410 is provided with a groove 411, wherein the concave direction of the groove 411 faces the second end surface 420, and the groove 411 is formed with a protrusion 421 on the second end surface 420. The recess 411 may be obtained by means of stamping or the like, wherein the protrusion 421 is formed in synchronization with the recess 411 when the stamping is performed.

The second end surface 420 is disposed opposite to the tab 110 in the housing 100, and the protrusion 421 is used for attaching to the tab 110. The protrusion 421 of the first current collecting plate 210 is attached to the tab 110 of the first end portion 101, and the protrusion 421 of the second current collecting plate 310 is attached to the tab 110 of the second end portion 102.

The tab 110 has a certain elasticity, and the protrusion 421 abuts against the tab 110 when the device is mounted. Under the action of pressure, the tab 110 deforms to be more tightly attached to the protrusion 421. It should be noted that only tab 110 of first end 101 is shown in the drawings.

The first side of the recess 411 extends toward the center of the tray 400 and the second side extends toward the outer edge of the tray 400. The recess 411 may be a kidney-shaped recess.

Referring to fig. 5, the groove 411 has a plurality of non-intersecting bonding pads 4111 therein, the bonding pads 4111 having a curved shape, the bonding pads 4111 extending from a first side of the groove 411 to a second side. The bonding pad 4111 is for bonding with the tab 110. Since the size of the recess 411 is limited, the number of the bonding pads 4111 may be 2 to 4.

The non-intersecting weld zones 4111 can increase the effective area of the weld.

The welding head performs a welding operation within the recess 411 along a curved trajectory, thereby forming a weld zone 4111.

In the present embodiment, a groove 411 is disposed on the first end surface 410 of the disc 400, wherein the concave direction of the groove 411 faces the second end surface 420, and the groove 411 is formed with a protrusion 421 on the second end surface 420. When assembling, the second end surface 420 is opposite to the tab 110 in the housing 100, and even if the second end surface 420 or the tab 110 is uneven due to the protrusion 421, the protrusion 421 and the tab 110 can be guaranteed to be attached to each other within a certain error range, so that when welding is performed in the groove 411, the occurrence of cold welding can be effectively avoided.

Further, the groove 411 has a plurality of non-intersecting welding areas 4111 therein, the welding areas 4111 are curved, the welding areas 4111 extend from the first side of the groove 411 to the second side, and the welding areas 4111 are used for welding with the tab 110. The strength and reliability of the connection between the disk body 400 and the tab 110 are ensured by the plurality of curved welding areas 4111.

In this embodiment, the disc 400 is provided with a central hole 401. The tray body 400 is provided with a plurality of grooves 411, and the grooves 411 are distributed in an annular array with respect to the central hole 401. Wherein, a middle through hole 430 is formed between two adjacent grooves 411, and the total weight of the tray 400 can be reduced by providing the middle through hole 430.

The number of the grooves 411 is 4 to 10. Too many grooves 411 may increase the processing difficulty and affect the structural strength of the disc 400, and too few grooves 411 may reduce the welding area, which is not beneficial to the connection strength between the disc 400 and the tab 110. In some embodiments, the number of grooves 411 may be 4, 5, 8, 9, etc.

The welding region 4111 has a wavy line shape, so that the welding area can be increased, thereby improving the connection strength between the disk 400 and the tab 110.

As shown in fig. 7, the positive electrode post 220 includes a first cylinder 221 and a first base 222 connected. The first column 221 and the first base 222 are both cylindrical, and are coaxially disposed. Wherein, the first column 221 and the first base 222 may be a unitary structure.

The cross-sectional area of the first cylinder 221 is smaller than that of the first base 222, wherein the first cylinder 221 is inserted into the central hole 401 of the first collecting tray 210, and the first cylinder 221 partially penetrates through the central hole 401 of the first collecting tray 210.

The cross-sectional area of first chassis 222 is greater than the cross-sectional area of central aperture 401 of first manifold plate 210, thereby preventing first chassis 222 from being inserted into central aperture 401 of first manifold plate 210. By providing the first base 222, the first column 221 can be provided with a mounting limit.

In this embodiment, the positive electrode post 220 is provided with a liquid injection hole 223, and the liquid injection hole 223 penetrates through the first column 221 and the first base 222.

As shown in fig. 8, the negative electrode tab 320 includes a second leg 321 and a second base 322 connected. The second cylinder 321 and the second base 322 are both cylindrical, and are coaxially arranged. Wherein, the second cylinder 321 and the second base 322 may be both of a unitary structure.

The cross-sectional area of the second post 321 is smaller than that of the second base 322, wherein the second post 321 is inserted into the central hole 401 of the second current collecting plate 310, and the second post 321 partially penetrates through the central hole 401 of the second current collecting plate 310.

The cross-sectional area of the second chassis 322 is larger than the cross-sectional area of the central hole 401 of the second collecting tray 310, thereby preventing the second chassis 322 from being inserted into the central hole 401 of the second collecting tray 310. By providing the second base 322, the second cylinder 321 can be provided with a mounting limit function.

In this embodiment, the circumferential surface of the first cylinder 221 is welded to the inner wall or/and the outer edge of the central hole 401 of the first current collecting plate 210, and the circumferential surface of the second cylinder 321 is welded to the inner wall or/and the outer edge of the central hole 401 of the second current collecting plate 310.

In this embodiment, the first current collecting plate 210 is covered with a first end cap 510, the first end cap 510 is fixedly connected to the housing 100, and the second current collecting plate 310 is covered with a second end cap 520, and the second end cap 520 is fixedly connected to the housing 100.

The first end cap 510 and the second end cap 520 each include a cap body 530, and an outer edge of the cap body 530 is welded to the case 100.

In this embodiment, the first end cap 510 and the second end cap 520 are both identical in structure.

Explosion-proof valves may be provided on both the first and second end caps 510 and 520, thereby improving the safety of use of the sodium cylindrical battery. The structure of the explosion-proof valve can refer to the existing design, and the description is omitted.

As shown in fig. 9, the cover 530 is provided with a mounting through hole 531.

After assembly, the positive electrode post 220 is partially inserted into the mounting through hole 531 of the first end cap 510, and the negative electrode post 320 is partially inserted into the mounting through hole 531 of the second end cap 520.

In this embodiment, the circumferential surface of the positive electrode post 220 is welded to the inner wall or/and the outer edge of the mounting through hole 531 of the first end cap 510, and the circumferential surface of the negative electrode post 320 is welded to the inner wall or/and the outer edge of the mounting through hole 531 of the second end cap 520.

Further, the outer edge of the mounting through hole 531 is provided with a convex ring 532, and the convex ring 532 is disposed around the mounting through hole 531. Wherein, at least one side of the cover 530 is provided with a convex ring 532. The inner diameter of the collar 532 is the same as the inner diameter of the mounting through hole 531.

By providing the convex ring 532, the contact area between the cap 530 and the post (instead of the positive post 220 and the negative post 320) can be increased, and the welding area between the cap 530 and the post can be increased when welding is performed, thereby improving the connection strength between the cap 530 and the post.

In the description of the present specification, a description referring to terms "one embodiment," "some 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 present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims

1. The sodium cylindrical battery is characterized by comprising a shell, wherein the shell comprises a first end part and a second end part, the first end part is provided with a first current collecting disc and a positive electrode post which are fixedly connected, and the second end part is provided with a second current collecting disc and a negative electrode post which are fixedly connected;

2. The sodium cylinder cell as in claim 1, wherein the tray body is provided with a central hole;

3. The sodium cylindrical battery of claim 2, wherein the positive electrode post comprises a first post and a first base connected, the first post having a cross-sectional area that is smaller than the cross-sectional area of the first base, wherein the first post is inserted into the central aperture of the first current collecting plate and the first post portion passes through the central aperture of the first current collecting plate;

4. The sodium cylindrical battery of claim 3, wherein the positive electrode post is provided with a liquid injection hole, and the liquid injection hole penetrates through the first post and the first base.

5. A sodium cylindrical battery according to claim 3, wherein the circumferential surface of the first cylinder is welded to the inner wall or/and the outer edge of the central hole of the first current collecting plate;

6. The sodium cylindrical battery according to any one of claims 1-5, wherein the first current collecting tray is covered with a first end cap, and the first end cap is fixedly connected with the housing;

7. The sodium cylinder cell as defined in claim 6, wherein the first end cap and the second end cap are each provided with an explosion-proof valve.

8. The sodium cylinder cell as set forth in claim 6, wherein the cover is provided with a mounting through hole;

9. The sodium cylindrical battery according to claim 8, wherein the peripheral surface of the positive electrode post is welded to the inner wall or/and the outer edge of the mounting through hole of the first end cap;

10. The sodium cylindrical battery as claimed in claim 8, wherein the outer edge of the mounting through hole is provided with a convex ring, the convex ring is arranged around the mounting through hole, wherein at least one side of the cover body is provided with the convex ring, and the inner diameter of the convex ring is identical to the inner diameter of the mounting through hole.