Battery connection structure and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a battery connecting structure and a battery, the battery connecting structure comprises a connecting block riveted with a cover body, and an insulating piece arranged between the connecting block and the cover body; the connecting block comprises a first base table and a pipe body part, the first base table is sunken to form a first welding part, the inner side circumferential wall of the pipe body part is enclosed to form a containing cavity, and one end of the containing cavity is sealed by the first welding part; the connecting assembly comprises a connecting piece and a connecting column, the connecting piece and the connecting block are oppositely arranged in the first direction, and the connecting piece is suitable for being welded to a pole lug of the pole group; one end of the connecting column is fixedly arranged on the side, close to the connecting block, of the connecting piece in the first direction, and the other end penetrates through the containing cavity and is welded to the first welding part. According to the battery connecting structure provided by the utility model, the assembly process of the battery is simplified, the complexity of battery assembly is reduced, the internal space of the battery is saved, and the volume energy density of the battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery connection structure and a battery. Background Art

[0002] In the existing cell structure, the pole column and the tab of the pole group are usually connected by a connecting piece, and the pole column and the riveting block are first riveted and then welded and fixed, so the assembly process is more and the assembly is complex. Summary of the Utility Model

[0003] In view of this, the utility model provides a battery connection structure and a battery to solve the problems of more assembly processes and complex assembly of the existing cell structure.

[0004] In a first aspect, the utility model provides a battery connection structure, including:

[0005] A connection block, riveted to the cover body, an insulating part is arranged between the connection block and the cover body, and the insulating part is suitable for insulating and sealing between the connection block and the cover body; the connection block includes a first base platform and a tube body part extending from one side of the first base platform along a first direction, a first welding part is recessed on the first base platform, and the inner peripheral wall of the tube body part encloses to form a receiving cavity, and one end of the receiving cavity is closed by the first welding part;

[0006] A connection assembly, including a connecting piece and a connecting column, the connecting piece and the connection block are arranged opposite to each other along the first direction, and the connecting piece is suitable for welding with the tab of the pole group; one end of the connecting column is fixedly arranged on the side of the connecting piece close to the connection block along the first direction, and the other end is suitable for passing through the receiving cavity and welding with the first welding part.

[0007] Beneficial effects: The battery connection structure provided by the utility model mainly includes a connection block and a connection assembly, wherein the connection assembly includes a connecting piece and a connecting column; in the manufacturing process, before the pole group enters the shell, the connecting piece and the connecting column are welded and fixed to form an integral connection assembly, and then the connecting piece is welded with the tab of the pole group to realize the electrical connection between the connection assembly and the tab of the pole group. During the process of the pole group entering the shell, the connecting column passes through the receiving cavity and cooperates with the first welding part, and then the end of the connecting column far from the connecting piece along the first direction is welded with the first welding part to realize the electrical connection between the connection assembly and the connection block, so as to lead out the electric quantity inside the battery to the outside. In this way, the assembly process of the battery is simplified, the complexity of battery assembly is reduced, which is beneficial to improving production efficiency. At the same time, by passing the column body part through the receiving cavity and welding with the first welding part, it is beneficial to save the internal space of the battery and improve the volume energy density of the battery.

[0008] In an optional embodiment, a second welding part is formed at one end of the connecting column close to the connection block along the first direction, and the second welding part and the first welding part are penetration welded.

[0009] Beneficial effects: During the manufacturing process, when the connecting column is inserted into the accommodating cavity and when the second welding part reaches a specified position relative to the first welding part, penetration welding is performed, enabling the laser to penetrate the first welding part and causing the first welding part and the second welding part to melt and connect, thereby achieving the purpose of electrical connection.

[0010] In an alternative embodiment, the thickness of the second welding part is greater than or equal to the thickness of the first welding part.

[0011] Beneficial effects: Thus, the thickness of the penetration welding surface is reduced, the welding power is lowered, the generation of pores is avoided, and the welding reliability is improved.

[0012] In an alternative embodiment, the connecting piece includes:

[0013] A first connecting part adapted to be welded to the tab;

[0014] A second connecting part disposed on one side of the first connecting part along the second direction, and the second connecting part is adapted to be welded to the connecting column;

[0015] A third connecting part formed between the first connecting part and the second connecting part by bending the connecting piece. The distance between the second connecting part and the electrode group is less than the distance between the first connecting part and the electrode group; the third connecting part is adapted to jointly form a first accommodating space with the side of the second connecting part close to the connecting column along the first direction, and at least part of the connecting column is adapted to be accommodated in the first accommodating space.

[0016] Beneficial effects: The third connecting part and the side of the second connecting part close to the connecting column along the first direction jointly form a first accommodating space. After the battery is assembled, at least part of the connecting column is accommodated through the first accommodating space, thereby reducing the space occupied by the connecting component inside the battery, which is beneficial to improving the volumetric energy density of the battery.

[0017] In an alternative embodiment, a positioning hole is formed in the second connecting part;

[0018] One end of the connecting column close to the connecting piece along the first direction forms a first step part and a second step part. The second step part is adapted to be inserted into the positioning hole, and one side of the first step part along the first direction is adapted to abut against the second connecting part.

[0019] Beneficial effects: By inserting the second step part into the positioning hole and making one side of the first step part along the first direction abut against the second connecting part, and welding the first step part and the second connecting part, the connecting piece and the connecting column are connected to form an integral connecting component, which is beneficial to simplifying the battery assembly process, reducing the complexity of battery assembly, and improving production efficiency.

[0020] In an alternative embodiment, the tab includes a first extension portion and a second extension portion. The first extension portion extends from one side of the electrode group in a first direction. The second extension portion is arranged at an angle with the first extension portion. The side of the second extension portion along the first direction close to the electrode group and one side of the first extension portion together form a second accommodation space;

[0021] The first connecting portion is disposed inside the second accommodation space. The first connecting portion is attached to the side of the second extension portion along the first direction close to the electrode group, and the first connecting portion is welded to the second extension portion.

[0022] Beneficial effects: Compared with the tab of the "S"-shaped structure in the related art, it not only reduces the bending difficulty, but also helps to save the space occupied inside the battery; the side of the second extension portion along the first direction close to the electrode group and one side of the first extension portion together form a second accommodation space. During assembly, by disposing the first connecting portion inside the second accommodation space and welding the first connecting portion to the second extension portion, the space occupied by the connecting piece and the tab inside the battery is further saved, thereby helping to improve the volumetric energy density of the battery.

[0023] In an alternative embodiment, a riveting portion is provided at one end of the tube body portion along the first direction away from the first welding portion. The riveting portion extends from the peripheral edge of the tube body portion in a direction away from the central axis of the tube body portion. The riveting portion and the first base are adapted to rivet and seal the connection block with the insulating member and the cover;

[0024] A first guiding portion is formed between the tube body portion and the riveting portion. The first guiding portion is adapted to guide the connecting column into the accommodation cavity.

[0025] Beneficial effects: By providing a riveting portion on the connection block and cooperating with the first base through the riveting portion, the insulating member is clamped between the connection block and the cover, thereby realizing the riveting and sealing between the connection block and the cover; by providing a first guiding portion on the connection block, it is convenient to easily insert the connecting column into the accommodation cavity through the guiding of the first guiding portion during the assembly process, thereby improving the assembly efficiency.

[0026] In an alternative embodiment, a second guiding portion is further provided at one end of the connecting column along the first direction close to the connection block. The second guiding portion is formed at the junction of the end face of the second welding portion and the side peripheral wall of the second welding portion. The second guiding portion is adapted to guide the connecting column into the accommodation cavity.

[0027] Beneficial effects: By providing a second guiding portion on the connecting column, it is convenient to guide the connecting column into the accommodation cavity through the cooperation of the second guiding portion and the first guiding portion during the assembly process, thereby improving the assembly efficiency.

[0028] In an alternative embodiment, a counterbore is formed in the first base. The counterbore is located on the side of the first welding portion away from the accommodation cavity along the first direction, and the counterbore serves as the welding area.

[0029] Beneficial effects: This prevents the welding mark from protruding from the end face of the first base, avoiding affecting the subsequent assembly of the battery.

[0030] In a second aspect, the present utility model further provides a battery, including: a battery body, and the battery connection structure as described above.

[0031] Beneficial effects: The battery in the second aspect includes the battery connection structure in the first aspect. Therefore, the battery in the second aspect includes all the beneficial effects of the battery connection structure in the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0033] Figure 1 It is a schematic assembly diagram of a battery connection structure, a cover body, and a pole group according to an embodiment of the present utility model;

[0034] Figure 2 It is a schematic cross-sectional structure diagram of a connection block of a battery connection structure according to an embodiment of the present utility model;

[0035] Figure 3 It is a schematic three-dimensional structure diagram of a connection assembly of a battery connection structure according to an embodiment of the present utility model;

[0036] Figure 4 It is a schematic assembly principle diagram of a connection assembly of a battery connection structure according to an embodiment of the present utility model;

[0037] Figure 5 It is a schematic three-dimensional structure diagram of a connection assembly of a battery connection structure and a pole group after completion of assembly according to an embodiment of the present utility model;

[0038] Figure 6 It is Figure 5 a partial enlarged schematic diagram at Q in

[0039] Figure 7 It is Figure 6 a schematic diagram of the structure after hiding the connection assembly in

[0040] Description of the reference numerals:

[0041] 10. Connection block; 11. First base; 12. Tube body part; 13. First welding part; 14. Accommodation cavity; 15. Riveting part; 16. First guiding part; 17. Counterbore

[0042] 20. Connection assembly; 21. Connection piece; 211. First connection part; 212. Second connection part; 213. Third connection part; 214. First accommodation space; 215. Positioning hole; 22. Connection column; 221. Second welding part; 222. First step part; 223. Second step part; 224. Second guiding part

[0043] 30. Insulating part

[0044] 40. Electrode group; 41. Electrode tab; 411. First extension part; 412. Second extension part; 413. Second accommodation space

[0045] 50. Cover body Detailed implementation mode

[0046] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0047] The following combines Figures 1 to 7 , to describe the embodiments of the present utility model.

[0048] According to an embodiment of the present utility model, on the one hand, a battery connection structure is provided, including:

[0049] A connection block 10, which is riveted to the cover body 50. An insulating part 30 is arranged between the connection block 10 and the cover body 50. The insulating part 30 is adapted to insulate and seal between the connection block 10 and the cover body 50. The connection block 10 includes a first base 11 and a tube body part 12 extending along a first direction from one side of the first base 11. A first welding part 13 is recessed on the first base 11. The inner peripheral wall of the tube body part 12 encloses to form an accommodation cavity 14. One end of the accommodation cavity 14 is closed by the first welding part 13.

[0050] A connection assembly 20, including a connection piece 21 and a connection column 22 that are fixedly connected to each other. The connection piece 21 and the connection block 10 are arranged opposite to each other along the first direction. The connection piece 21 is adapted to be welded to the electrode tab 41 of the electrode group 40. One end of the connection column 22 is fixedly arranged on the side of the connection piece 21 close to the connection block 10 along the first direction, and the other end is adapted to pass through the accommodation cavity 14 and be welded to the first welding part 13.

[0051] Further, one end of the first welding part 13 and the connecting column 22 can be electrically connected by penetration welding.

[0052] The battery connection structure provided by the present utility model mainly includes a connection block 10 and a connection assembly 20. Among them, the connection assembly 20 includes a connection piece 21 and a connecting column 22. During the manufacturing process, before the electrode group is put into the shell, the connection piece 21 and the connecting column 22 are welded and fixed to form an integral connection assembly 20, and then the connection piece 21 is welded to the electrode tab of the electrode group to realize the electrical connection between the connection assembly 20 and the electrode tab of the electrode group. During the process of putting the electrode group into the shell, the connecting column 22 passes through the accommodating cavity 14 and cooperates with the first welding part 13, and then the end of the connecting column 22 far from the connection piece 21 along the first direction is welded to the first welding part 13 to realize the electrical connection between the connection assembly 20 and the connection block 10, thereby leading the electric quantity inside the battery to the outside. In this way, the assembly process of the battery is simplified, the complexity of battery assembly is reduced, which is beneficial to improving production efficiency. At the same time, by passing the connecting column 22 through the accommodating cavity 14 and welding it to the first welding part 13, it is beneficial to save the internal space of the battery and improve the volume energy density of the battery.

[0053] In some embodiments, please refer to Figure 4 As shown, one end of the connecting column 22 close to the connection block 10 along the first direction forms a second welding part 221. Please also refer to Figure 1 As shown, the second welding part 221 and the first welding part 13 are penetration welded.

[0054] It should be noted that during the manufacturing process, when the connecting column 22 is inserted into the accommodating cavity 14 and when the second welding part 221 reaches the specified position relative to the first welding part 13, penetration welding is used for welding, so that the laser penetrates the first welding part 13, and the first welding part 13 and the second welding part 221 are melted and connected, thereby achieving the purpose of electrical connection.

[0055] In some embodiments, the thickness of the second welding part 221 is greater than or equal to the thickness of the first welding part 13.

[0056] It should be noted that if the thickness of the first welding part 13 is too large, it is easy to cause too high laser energy, resulting in the gas accumulated in the middle of the first welding part 13 being unable to be discharged in time, generating pores and affecting the reliability of welding.

[0057] In this embodiment, the thickness of the second welding part 221 is greater than or equal to the thickness of the first welding part 13, thereby reducing the thickness of the penetration welding surface, reducing the welding power, avoiding the generation of pores, and improving the reliability of welding.

[0058] In some embodiments, please also refer to Figure 4 and Figure 4As shown, the connecting piece 21 includes:

[0059] A first connecting portion 211 adapted to be welded to the tab 41;

[0060] A second connecting portion 212 disposed on one side of the first connecting portion 211 along the second direction, and the second connecting portion 212 is adapted to be welded to the connecting post 22;

[0061] A third connecting portion 213 formed between the first connecting portion 211 and the second connecting portion 212 by bending the connecting piece 21. The distance between the second connecting portion 212 and the electrode group 40 is less than the distance between the first connecting portion 211 and the electrode group 40; the third connecting portion 213 is adapted to jointly form a first accommodating space 214 with the side of the second connecting portion 212 close to the connecting post 22 along the first direction, and at least part of the connecting post 22 is adapted to be accommodated in the first accommodating space 214.

[0062] In this embodiment, the connecting piece 21 mainly includes a first connecting portion 211, a second connecting portion 212, and a third connecting portion 213. The third connecting portion 213 and the side of the second connecting portion 212 close to the connecting post 22 along the first direction jointly form a first accommodating space 214. After the battery is assembled, at least part of the connecting post 22 is accommodated through the first accommodating space 214, thereby reducing the space occupied by the connecting assembly 20 inside the battery and being beneficial to improving the volume energy density of the battery.

[0063] In some embodiments, please refer to Figure 4 As shown, a positioning hole 215 is formed on the second connecting portion 212;

[0064] One end of the connecting post 22 close to the connecting piece 21 along the first direction forms a first step portion 222 and a second step portion 223. The second step portion 223 is adapted to be inserted into the positioning hole 215, and one side of the first step portion 222 along the first direction is adapted to abut against the second connecting portion 212.

[0065] Further, the first step portion 222 and the second connecting portion 212 can be connected and fixed by penetration welding.

[0066] In this embodiment, by inserting the second step portion 223 into the positioning hole 215, making one side of the first step portion 222 along the first direction abut against the second connecting portion 212, and welding the first step portion 222 and the second connecting portion 212, the connecting piece 21 and the connecting post 22 are connected to form an integral connecting assembly 20, which is beneficial to simplifying the battery assembly process, reducing the complexity of battery assembly, and being beneficial to improving production efficiency.

[0067] In some embodiments, please refer to Figure 7As shown, the tab 41 includes a first extension portion 411 and a second extension portion 412. The first extension portion 411 extends from one side of the electrode assembly 40 in a first direction. The second extension portion 412 is disposed at an angle to the first extension portion 411. The side of the second extension portion 412 along the first direction close to the electrode assembly 40 and one side of the first extension portion 411 together form a second accommodation space 413.

[0068] Please also refer to Figure 6 As shown, the first connection portion 211 is disposed inside the second accommodation space 413. The first connection portion 211 is disposed in contact with the side of the second extension portion 412 along the first direction close to the electrode assembly 40, and the first connection portion 211 is welded to the second extension portion 412.

[0069] Furthermore, penetration welding can be used between the first connection portion 211 and the second extension portion 412 to achieve the purpose of electrical connection.

[0070] It should be noted that, please refer to Figure 7 As shown, in this embodiment, the tab 41 extends from the electrode assembly 40 and forms an "L" - shaped structure through bending, thereby forming the first extension portion 411 and the second extension portion 412. Compared with the tab of the "S" - shaped structure in the related art, it not only reduces the bending difficulty but also is beneficial to saving the space occupied inside the battery. The side of the second extension portion 412 along the first direction close to the electrode assembly 40 and one side of the first extension portion 411 together form the second accommodation space 413. During assembly, by disposing the first connection portion 211 inside the second accommodation space 413 and welding the first connection portion 211 to the second extension portion 412, the space occupied by the connection piece 21 and the tab 41 inside the battery is further saved, which is beneficial to improving the volume energy density of the battery.

[0071] In some embodiments, please refer to Figure 2 As shown, at one end of the tube body portion 12 along the first direction away from the first welding portion 13, a riveting portion 15 is provided. The riveting portion 15 extends from the circumferential edge of the tube body portion 12 in a direction away from the central axis of the tube body portion 12. Please also refer to Figure 1 As shown, the riveting portion 15 and the first base 11 are adapted to rivet and seal - fix the connection block 10 with the insulating member 30 and the cover body 50.

[0072] A first guiding portion 16 is formed between the tube body portion 12 and the riveting portion 15. The first guiding portion 16 is adapted to guide the connection post 22 into the accommodation cavity 14.

[0073] It should be noted that the insulating member 30 may include an upper plastic, a lower plastic, and / or a sealing ring. The insulating member 30 is disposed between the connecting block 10 and the cover body 50, and the insulating member 30 is adapted to insulate and seal between the connecting block 10 and the cover body 50; the specific structure of the insulating member 30 is not specifically limited herein. The first base 11 is disposed on a side of the cover body 50 away from the electrode group 40 along its own thickness direction, and the riveting portion 15 is disposed on a side of the cover body 50 close to the electrode group 40 along its own thickness direction. The first base 11 and the riveting portion 15 are adapted to snap the insulating member 30 between the connecting block 10 and the cover body 50.

[0074] In this embodiment, by providing the riveting portion 15 on the connecting block 10 and cooperating with the first base 11 through the riveting portion 15, the insulating member 30 is snapped between the connecting block 10 and the cover body 50, thereby realizing the riveting and sealing between the connecting block 10 and the cover body 50; by providing the first guiding portion 16 on the connecting block 10, it is convenient to easily insert the connecting column 22 into the accommodating cavity 14 through the guiding of the first guiding portion 16 during the assembly process, thereby improving the assembly efficiency.

[0075] In some embodiments, please also refer to Figure 3 and Figure 4 As shown, a second guiding portion 224 is further provided at one end of the connecting column 22 close to the connecting block 10 along the first direction. The second guiding portion 224 is formed at the junction of the end face of the second welding portion 221 and the side peripheral wall of the second welding portion 221, and the second guiding portion 224 is adapted to guide the connecting column 22 into the accommodating cavity 14.

[0076] In this embodiment, by providing the second guiding portion 224 on the connecting column 22, it is convenient to guide through the cooperation of the second guiding portion 224 and the first guiding portion 16 during the assembly process, and easily insert the connecting column 22 into the accommodating cavity 14, thereby improving the assembly efficiency.

[0077] In some embodiments, a counterbore 17 is formed on the first base 11. The counterbore 17 is located on a side of the first welding portion 13 away from the accommodating cavity 14 along the first direction. The counterbore 17 is a welding area, thereby preventing the welding mark from protruding from the end face of the first base 11 and avoiding affecting the subsequent assembly of the battery.

[0078] Furthermore, the counterbore 17 may be circular.

[0079] According to an embodiment of the present invention, on the other hand, a battery is further provided, including: a battery body, and the battery connection structure as described above.

[0080] The battery in this embodiment includes the above-mentioned battery connection structure. Therefore, the battery in this embodiment includes all the beneficial effects of the above-mentioned battery connection structure.

[0081] Although embodiments of the present utility model have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A battery connection structure, characterized in that: include: A connecting block is riveted to the cover body, an insulating member is provided between the connecting block and the cover body, and the insulating member is suitable for insulating and sealing the connecting block and the cover body; The connecting block comprises a first base and a tube body portion extending from one side of the first base along a first direction, the first base is recessed to form a first welding portion, the inner peripheral wall of the tube body portion encloses a receiving cavity, and one end of the receiving cavity is closed by the first welding portion; A connecting assembly comprises a connecting piece and a connecting column, wherein the connecting piece and the connecting block are arranged opposite to each other along a first direction, and the connecting piece is suitable for being welded to the pole ear of the pole group; one end of the connecting column is fixedly arranged on one side of the connecting piece close to the connecting block along the first direction, and the other end is suitable for passing through the accommodating cavity and being welded to the first welding portion.

2. The battery connection structure according to claim 1, characterized in that: A second welding portion is formed at one end of the connecting column close to the connecting block along the first direction, and the second welding portion is penetrated and welded with the first welding portion.

3. The battery connection structure according to claim 2, characterized in that: The thickness of the second welding portion is greater than or equal to the thickness of the first welding portion.

4. The battery connection structure according to claim 1, characterized in that: The connecting piece comprises: A first connecting portion, suitable for welding with a tab; A second connecting portion, disposed on one side of the first connecting portion along the second direction, the second connecting portion being suitable for being welded to the connecting column; The third connecting part is formed by bending the connecting sheet between the first connecting part and the second connecting part, and the distance between the second connecting part and the pole group is smaller than the distance between the first connecting part and the pole group; the third connecting part is suitable for forming a first accommodating space together with the second connecting part along the first direction close to the side of the connecting column, and the first accommodating space is suitable for accommodating at least part of the connecting column.

5. The battery connection structure according to claim 4, characterized in that: A positioning hole is formed on the second connecting portion; The connecting column forms a first step portion and a second step portion at one end close to the connecting piece along the first direction, the second step portion is suitable for being inserted into the positioning hole, and one side of the first step portion in the first direction is suitable for abutting against the second connecting portion.

6. The battery connection structure according to claim 4, characterized in that: The pole lug includes a first extension portion and a second extension portion, wherein the first extension portion extends from one side of the pole group along a first direction, the second extension portion is arranged at an angle to the first extension portion, and a side of the second extension portion close to the pole group along the first direction and a side of the first extension portion together form a second accommodation space; The first connection portion is built into the second accommodation space, the first connection portion and the second extension portion are arranged in contact with each other along a first direction close to a side of the pole group, and the first connection portion and the second extension portion are welded.

7. The battery connection structure according to claim 1, characterized in that: A rivet portion is provided at one end of the tube body portion away from the first welding portion along a first direction, the rivet portion is formed by extending from the peripheral edge of the tube body portion along a direction away from the central axis of the tube body portion, and the rivet portion and the first base are suitable for riveting and sealing the connection block with the insulating member and the cover body; A first guide portion is formed between the tube body portion and the riveting portion, and the first guide portion is suitable for guiding the connecting column into the accommodating cavity.

8. The battery connection structure according to claim 2, characterized in that: A second guide portion is also provided at one end of the connecting column close to the connecting block along the first direction. The second guide portion is formed at the intersection of the end surface of the second welding portion and the side wall of the second welding portion. The second guide portion is suitable for guiding the connecting column into the accommodating cavity.

9. The battery connection structure according to any one of claims 1 to 8, characterized in that: A sinking platform is formed on the first base, and the sinking platform is located on a side of the first welding portion away from the accommodating cavity along the first direction, and the sinking platform is a welding area.

10. A battery, characterized in that: include: A battery body, and a battery connection structure as claimed in any one of claims 1 to 9.

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