Negative pole structure, battery cover plate assembly and single battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a negative pole structure, a battery cover plate assembly and a single battery. The negative pole structure comprises a copper piece and an aluminum piece, the aluminum piece comprises a body part and a connecting part, the connecting part is arranged on the side, facing the copper piece, of the body part and is in welded connection with the copper piece, and the area of the side face, facing the copper piece, of the connecting part is larger than that of the cross section of the body part. The area of at least one side face of the copper piece close to the aluminum piece is not smaller than that of one side face of the connecting part towards the copper piece. According to the negative pole structure, the contact area of the welding connection surface between the aluminum piece and the copper piece is increased, so that the welding combination area of the aluminum piece and the copper piece is increased, the stability of the aluminum piece and the copper piece after welding is improved, and the processing reliability of the negative pole structure is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a negative pole post structure, battery cover plate subassembly and single cell battery. BACKGROUND

[0002] With the rapid development of new energy vehicles, power battery as the power source of new energy vehicles is one of the key components of new energy vehicles, and the battery cover plate subassembly is the core component of safety and sealing, and its performance stability is crucial to the power battery.

[0003] The battery cover plate subassembly currently applied in the market usually comprises a cover plate body and a pole, and in general cases, the positive pole is usually an aluminum structure or an aluminum-aluminum composite structure, and the negative pole is a copper-aluminum composite structure, for the negative pole, friction welding is usually adopted for the welding connection of the aluminum part and the copper part, but for the battery cover plate subassembly with a small pole, the bonding surface of the copper part and the aluminum part is too small, causing poor bonding effect of the copper part and the aluminum part after friction welding, and the problem of easy fracture occurs.

[0004] Therefore, a new negative pole post structure is urgently needed to solve the above technical problems. UTILITY MODEL CONTENTS

[0005] One purpose of the utility model is to provide a negative pole post structure, which can increase the bonding surface area of the copper part and the aluminum part, improve the connection stability of the two, and thus improve the processing reliability of the negative pole post structure.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The negative pole post structure comprises a copper part and an aluminum part, the aluminum part comprises a body part and a connecting part, the connecting part is arranged on the side of the body part facing the copper part, the connecting part is welded to the copper part, the area of the side of the connecting part facing the copper part is greater than the cross-sectional area of the body part, and the area of at least one side of the copper part close to the aluminum part is not less than the area of the side of the connecting part facing the copper part.

[0008] Optionally, the outer circumferential surface diameter of the connecting part is the same in the direction from the body part to the copper part, and the outer diameter of the connecting part is greater than the outer diameter of the body part.

[0009] Optionally, the diameter of the outer circumferential surface of the connecting part increases in the direction from the body part to the copper part.

[0010] Optionally, the cross-sectional area of the copper part is not less than the area of the side of the connecting part facing the copper part.

[0011] Optionally, the copper piece includes a protruding portion, the protruding portion is welded to the connecting portion, and a cross-sectional area of the protruding portion is not less than an area of a side surface of the connecting portion facing the copper piece.

[0012] Optionally, the connecting portion and the body portion are connected to form a stepped portion, and the stepped portion is used for limiting connection with the cover body.

[0013] Optionally, the copper piece is provided with a welding hole, the aluminum piece is provided with a welding column, and the welding column is assembled in the welding hole.

[0014] Another purpose of the utility model is to provide a battery cover plate assembly, which can increase the bonding surface area of the copper piece and the aluminum piece, improve the connection stability of the two, and thus improve the processing reliability of the battery cover plate assembly.

[0015] To achieve the purpose, the utility model adopts the following technical scheme:

[0016] The battery cover plate assembly comprises the negative pole post structure.

[0017] Optionally, the battery cover plate assembly further comprises a cover body and a fixing block, the negative pole post structure is sealingly and insulatingly arranged on the cover body, the fixing block is insulatingly arranged on a side of the cover body away from the copper piece, and the fixing block is fixedly connected with the aluminum piece.

[0018] Another purpose of the utility model is to provide a single battery, which can increase the bonding surface area of the copper piece and the aluminum piece, improve the connection stability of the two, and thus improve the processing reliability of the single battery.

[0019] To achieve the purpose, the utility model adopts the following technical scheme:

[0020] The single battery comprises the battery cover plate assembly.

[0021] The utility model has the beneficial effects of:

[0022] The utility model provides a kind of negative pole post structure, battery cover plate assembly and single cell, by aluminium piece is divided into body part and connecting part, body part is used to external electrical connection, connecting part is used to be welded with copper piece, and the area of the side surface of connecting part towards copper piece is greater than the area of the cross section of body part, simultaneously, the area of the side surface of copper piece close to aluminium piece is not less than the area of the side surface of connecting part towards copper piece, such setting increases the contact area of the welding connection surface between aluminium piece and copper piece, to improve the area of welding combination of two, and further improve the stability after welding of two, to improve the processing reliability of negative pole post structure.Simultaneously, such setting also improves the adaptability of the negative pole post structure, so that no matter how small the negative pole post structure is, copper piece and aluminium piece can be stably connected by welding directly, to realize the forming of negative pole post structure. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is the axonometric view of the negative pole post structure provided by the utility model embodiment;

[0024] Figure 2 is the front view of the battery cover plate assembly provided by the utility model embodiment;

[0025] Figure 3 is Figure 2 sectional view of A-A in Fig.

[0026] Figure 4 is Figure 3 local enlarged view of B in Fig.

[0027] in the figure:

[0028] 10, copper piece;

[0029] 20, aluminium piece; 21, body part; 22, connecting part; 23, step part;

[0030] 100, negative pole post structure; 200, cover plate body; 300, fixed block; 400, upper plastic piece; 500, lower plastic piece. DETAILED DESCRIPTION

[0031] The utility model will be further described in detail in combination with the drawings and examples.It can be understood that the specific examples described herein are only used to explain the utility model, and not limited to the utility model.In addition, it needs to be explained that, for the convenience of description, only part of the structure related to the utility model is shown in the drawings, not all structures.

[0032] In the description of the utility model, unless another definite provision and limitation, the term "link", "connect", "fix" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be direct connection, also can be indirectly connected through the intermediate medium, can be two elements inside the communication or two elements of the interaction relationship.For the ordinary skilled in the art, the above-mentioned terms can be understood in the specific meaning of the utility model according to the specific circumstances.

[0033] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the first and second features direct contact, also can include the first and second features are not direct contact but contact through the additional features between them.Moreover, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or just indicates that the horizontal height of the first feature is higher than the second feature.The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or just indicates that the horizontal height of the first feature is less than the second feature.

[0034] In the description of the embodiment, the terms "on", "under", "left", "right", etc. Orientation or position relationship is based on the orientation or position relationship shown in the drawing, only for the convenience of description and simplification operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model.In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0035] The embodiment provides a negative pole structure 100, which comprises a copper piece 10 and an aluminum piece 20, the aluminum piece 20 comprises a body part 21 and a connecting part 22, the connecting part 22 is arranged on the side of the body part 21 towards the copper piece 10, the connecting part 22 is welded with the copper piece 10, the area of the side surface of the connecting part 22 towards the copper piece 10 is greater than the cross-sectional area of the body part 21, and the area of the side of the copper piece 10 close to the aluminum piece 20 is not less than the area of the side surface of the connecting part 22 towards the copper piece 10.

[0036] The negative pole post structure 100 in the embodiment, by dividing the aluminum piece 20 into the body part 21 and the connecting part 22, the body part 21 is used for external electrical connection, the connecting part 22 is used for welding with the copper piece 10, and the area of the side surface of the connecting part 22 facing the copper piece 10 is greater than the cross-sectional area of the body part 21. At the same time, the area of the side surface of the copper piece 10 close to the aluminum piece 20 is not less than the area of the side surface of the connecting part 22 facing the copper piece 10. The setting increases the contact area of the welding connection surface between the aluminum piece 20 and the copper piece 10, thereby improving the welding area of the two, and further improving the stability after welding, thereby improving the processing reliability of the negative pole post structure 100. At the same time, the setting also improves the adaptability of the negative pole post structure 100, so that no matter how small the size of the negative pole post structure 100 is, the copper piece 10 and the aluminum piece 20 can be stably connected through welding, thereby realizing the forming of the negative pole post structure 100.

[0037] It can be understood that the specific welding connection mode between the aluminum piece 20 and the copper piece 10 in the embodiment is friction welding, which is mature in manufacturing process, convenient to manufacture, does not need to replace the existing welding equipment, and has low modification cost. In other embodiments, the specific welding connection mode between the aluminum piece 20 and the copper piece 10 can also be other forms, which is not limited here.

[0038] In some optional embodiments, the outer circumferential surface diameter of the connecting part 22 is the same, and the outer diameter of the connecting part 22 is greater than the outer diameter of the body part 21, that is, along the direction from the body part 21 to the copper piece 10, the diameters of the outer circumferential surfaces of the connecting part 22 are the same, so that the area of the side surface of the connecting part 22 facing the copper piece 10 is greater than the cross-sectional area of the body part 21.

[0039] In some optional embodiments, along the direction from the body part 21 to the copper piece 10, the diameters of the outer circumferential surfaces of the connecting part 22 increase, that is, the area of the side surface of the connecting part 22 facing the copper piece 10 is greater than the cross-sectional area of the body part 21.

[0040] In some embodiments, the connecting part 22 and the body part 21 are connected to form a stepped part 23, which is used for limiting connection with the cover body 200, so that when the negative pole post structure 100 is connected with the cover body 200 in the battery cover assembly, a limiting step can be added, thereby better realizing the installation of the negative pole post structure 100.

[0041] In some optional embodiments, the cross-sectional area of the copper piece 10 is not less than the area of the side surface of the connecting part 22 facing the copper piece 10, that is, at least the area of the side surface of the copper piece 10 close to the aluminum piece 20 is not less than the area of the side surface of the connecting part 22 facing the copper piece 10.

[0042] In some alternative embodiments, the copper piece 10 comprises a protruding part welded to the connecting part 22, and the cross-sectional area of the protruding part is not less than the area of the side surface of the connecting part 22 facing the copper piece 10, so that the area of the side surface of the copper piece 10 close to the aluminum piece 20 is not less than the area of the side surface of the connecting part 22 facing the copper piece 10, and the protruding part is used as a connecting end, without the need to make the whole copper piece 10 into a large-area structure, avoiding the problem of resource waste caused by the need to set a large size when the copper piece 10 does not need to be too large.

[0043] In some embodiments, the copper piece 10 is provided with a welding hole, and the aluminum piece 20 is provided with a welding column which is assembled in the welding hole, further improving the fixed connection effect of the two, increasing the welding area of the two, and thus improving the stability of the connection between the two.

[0044] The embodiment also provides a battery cover plate assembly comprising the negative pole post structure 100 of any of the above-mentioned schemes. By using the negative pole post structure 100, the bonding surface area of the copper piece 10 and the aluminum piece 20 is increased, and the connection stability of the two is improved, thereby improving the processing reliability of the battery cover plate assembly.

[0045] It can be understood that the battery cover plate assembly can be a single-pole post cover plate or a double-pole post cover plate, and when it is a double-pole post cover plate, the battery cover plate assembly further comprises a positive pole post structure, which is not limited here.

[0046] In some embodiments, the battery cover plate assembly further comprises a cover plate body 200, and the negative pole post structure 100 is sealingly and insulatingly arranged on the cover plate body 200, so as to realize the connection of the battery cover plate assembly and the shell of the single battery.

[0047] In some embodiments, the battery cover plate assembly further comprises a fixing block 300, which is insulatingly arranged on the side of the cover plate body 200 away from the copper piece 10, and the fixing block 300 is fixedly connected with the aluminum piece 20, so as to further fix the negative pole post structure 100 and increase the connection area of the external connection surface.

[0048] In some embodiments, the battery cover plate assembly further comprises an upper plastic piece 400 arranged between the fixing block 300 and the cover plate body 200 to realize the insulating arrangement between the fixing block 300 and the cover plate body 200.

[0049] In some embodiments, the battery cover plate assembly further comprises a lower plastic piece 500 arranged on the side of the cover plate body 200 away from the fixing block 300 to realize the insulating arrangement of the cover plate body 200 and the copper piece 10 and other structures of the pole post.

[0050] The embodiment also provides a single battery comprising the battery cover plate assembly according to any one of the above solutions.

[0051] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not a limitation on the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the utility model. Here, all the embodiments need not and cannot be exhausted. Any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A negative pole post structure, characterized by, The copper piece (10) and the aluminum piece (20) are included, the aluminum piece (20) includes a body part (21) and a connecting part (22), the connecting part (22) is arranged on the side of the body part (21) towards the copper piece (10), the connecting part (22) is welded with the copper piece (10), the area of the side of the connecting part (22) towards the copper piece (10) is greater than the cross-sectional area of the body part (21), and the area of the side of at least the copper piece (10) close to the aluminum piece (20) is not less than the area of the side of the connecting part (22) towards the copper piece (10).

2. The negative pole post structure according to claim 1, characterized by Along the direction from the body part (21) to the copper piece (10), the outer peripheral surface diameter of the connecting part (22) is the same, and the outer diameter of the connecting part (22) is greater than the outer diameter of the body part (21).

3. The negative pole post structure according to claim 1, characterized by Along the direction from the body part (21) to the copper piece (10), the diameter of the outer peripheral surface of the connecting part (22) is increased.

4. The negative pole post structure according to any one of claims 1 to 3, characterized by, The cross-sectional area of the copper piece (10) is not less than the area of the side of the connecting part (22) towards the copper piece (10).

5. The negative pole post structure according to any one of claims 1 to 3, characterized by, The copper piece (10) includes a protruding part, the protruding part is welded with the connecting part (22), and the cross-sectional area of the protruding part is not less than the area of the side of the connecting part (22) towards the copper piece (10).

6. The negative pole post structure according to any one of claims 1 to 3, characterized by, The connecting part (22) and the body part (21) are connected to form a stepped part (23) for limiting connection with a cover body (200).

7. The negative pole post structure according to any one of claims 1 to 3, characterized by, The copper piece (10) is provided with a welding hole, and the aluminum piece (20) is provided with a welding column which is assembled in the welding hole.

8. A battery cover plate assembly characterized by, The negative pole post structure (100) as claimed in any one of claims 1-7 is included.

9. The battery cover plate assembly of claim 8, wherein, The battery cover assembly further includes a cover body (200) and a fixing block (300), the negative pole post structure (100) is sealingly and insulatingly arranged on the cover body (200), the fixing block (300) is insulatingly arranged on the side of the cover body (200) away from the copper piece (10), and the fixing block (300) is fixedly connected with the aluminum piece (20).

10. A single cell characterized by The battery cover assembly as claimed in claim 8 or 9 is included.

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