Battery cover plate assembly and power battery

Abstract

A battery cover plate assembly and a power battery. The battery cover plate assembly comprises a cover plate piece (1), a conductive piece (2) and a terminal (3). The cover plate piece (1) is provided with a first connecting hole (11); the conductive piece (2) is provided with a second connecting hole (21); the conductive piece (2) is mounted on the outer side of the cover plate piece (1), and the conductive piece (2) is configured such that a busbar (7) is welded thereto; a first end of the terminal (3) is folded outwards to form a first flange (31); a connecting wall (32) having a preset wall thickness is provided at a second end of the terminal (3), the inner side of the connecting wall (32) being configured to be welded to a current collector disc (8); a second flange (33) is provided on the outer edge of the connecting wall (32); after the second end of the terminal (3) successively passes through the first connecting hole (11) and the second connecting hole (21) from the inner side of the cover plate piece (1), the first flange (31) abuts against the inner wall of the cover plate piece (1); and the second flange (33) is folded outwards so as to be riveted to the side of the conductive piece (2) away from the cover plate piece (1).

Description

Battery cover assembly and power battery

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on January 3, 2024, with application number 202420011148.4. The entire contents of the above application are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, for example, to a battery cover assembly and a power battery. Background Art

[0003] Currently, batteries are equipped with poles. The poles on the inner side of the battery need to be welded to the current collector plate, and the poles on the outer side of the battery need to be connected to the conductive bar via a conductive sheet. The poles also need to have a certain structural strength in the cover plate. In related technologies, the conductive sheet and pole are integrally formed, which can only be achieved through upsetting. However, upsetting leads to large dimensional errors in the poles, poor stability after welding the poles to the current collector plate, and low yield rate.

[0004] Summary of the Invention

[0005] The present application provides a battery cover assembly and a power battery, which can improve the consistency and stability of the welding of the pole and the collecting plate, thereby improving the yield of the battery packaging and the stability of the battery.

[0006] In one aspect, the present application provides a battery cover assembly, comprising:

[0007] a cover plate, wherein the cover plate is provided with a first connecting hole;

[0008] A conductive sheet, wherein the conductive sheet is provided with a second connection hole, the conductive sheet is mounted on the outer side of the cover sheet, and the conductive sheet is configured as a welded guide bar;

[0009] A pole, wherein the first end of the pole is folded outward to form a first flange, the second end of the pole is provided with a connecting wall of a preset wall thickness, the inner side of the connecting wall is configured to be welded to the collecting plate, and the outer edge of the connecting wall is provided with a second flange, after the second end of the pole is passed through the inner side of the cover plate and sequentially passed through the first connecting hole and the second connecting hole, the first flange abuts against the inner wall of the cover plate; and the second flange is folded outward to rivet the side of the conductive sheet away from the cover plate.

[0010] Optionally, the outer wall of the pole is stepped, the pole includes a large diameter section and a small diameter section, a stepped surface is provided between the large diameter section and the small diameter section, the first flange is provided at an end of the large diameter section away from the small diameter section, the connecting wall is provided at an end of the small diameter section away from the large diameter section, the large diameter section is passed through the first connecting hole, the small diameter section is passed through the second connecting hole, and the conductive sheet is partially overlapped on the stepped surface.

[0011] Optionally, a sealing ring is provided between at least one of the large-diameter section and the inner wall of the first connecting hole or between the first flange and the inner wall of the cover plate.

[0012] Optionally, a rivet groove is provided at one end of the second connecting hole away from the first connecting hole, and the second flange is folded outward and embedded in the rivet groove.

[0013] Optionally, the second flange is connected to the conductive sheet by welding.

[0014] Optionally, a first insulating ring is provided between the conductive sheet and the cover sheet.

[0015] Optionally, a positioning groove is provided on a side of the first insulating ring facing away from the cover plate, and the conductive sheet is embedded in the positioning groove.

[0016] Optionally, a second insulating ring is provided between the first flange and the cover plate.

[0017] Optionally, the pole is a stamped structure.

[0018] On the other hand, the present application provides a power battery, comprising a guide bar, a current collecting plate and a battery cover assembly as described in any of the above schemes, wherein the guide bar is welded to the conductive sheet, and the current collecting plate is welded to the inner side of the connecting wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following is a brief introduction to the drawings required for describing the embodiments of this application.

[0020] FIG1 is a cross-sectional view of a battery cover assembly according to a specific embodiment of the present application;

[0021] FIG2 is a cross-sectional view of a pole provided in a specific embodiment of the present application;

[0022] FIG3 is an exploded view of the structure of a battery cover assembly provided in a specific embodiment of the present application;

[0023] FIG4 is a schematic diagram of a guide bar provided in a specific embodiment of the present application;

[0024] FIG5 is a schematic diagram of a current collecting plate provided in a specific embodiment of the present application.

[0025] The following are marked in the figure:

[0026] 1. Cover plate; 11. First connecting hole;

[0027] 2. Conductive sheet; 21. Second connection hole; 22. Riveting groove;

[0028] 3. Pole; 31. First flange; 32. Connecting wall; 33. Second flange; 34. Large diameter section; 35. Small diameter section; 36. Step surface;

[0029] 4. Sealing ring;

[0030] 5. First insulating ring; 51. Positioning groove;

[0031] 6. Second insulating ring;

[0032] 7. Diversion row;

[0033] 8. Collecting plate. DETAILED DESCRIPTION

[0034] The present application will be described below with reference to the accompanying drawings and embodiments. It will be understood that the specific embodiments described herein are intended only to illustrate the present application and are not intended to limit the present application. In addition, for ease of description, only portions of the present application, not all structures, are shown in the accompanying drawings.

[0035] In the description of this application, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0036] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0037] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., regarding orientations or positions, are based on the orientations or positions shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0038] As shown in Figures 1 and 2, this embodiment provides a battery cover assembly, which includes a cover plate 1, a conductive plate 2, and a pole 3. The cover plate 1 is provided with a first connection hole 11; the conductive plate 2 is provided with a second connection hole 21. The conductive plate 2 is mounted on the outside of the cover plate 1 and is configured to be welded to the current guide bar 7; the first end of the pole 3 is folded outward to form a first flange 31, and the second end of the pole 3 is provided with a connecting wall 32 of preset wall thickness. The inner side of the connecting wall 32 is configured to be welded to the current collecting plate 8, and the outer edge of the connecting wall 32 is provided with a second flange 33. After the second end of the pole 3 passes through the inner side of the cover plate 1 and is sequentially passed through the first connection hole 11 and the second connection hole 21, the first flange 31 abuts against the inner wall of the cover plate 1; and the second flange 33 is folded outward to rivet the conductive plate 2 away from the cover plate 1.

[0039] During assembly, the second end of the pole 3 is passed through the inner side of the cover plate 1 and is sequentially passed through the first connection hole 11 and the second connection hole 21. At this time, the first flange 31 abuts against the inner wall of the cover plate 1; then the second flange 33 is folded outward to rivet the side of the conductive sheet 2 away from the cover plate 1, and at this time, the cover plate 1, the conductive sheet 2 and the pole 3 are fixedly connected; then, the guide bar 7 is welded to the conductive sheet 2, thereby fixing the guide bar 7 and electrically connecting the guide bar 7 to the conductive sheet 2. The inner side of the connecting wall 32 is welded to the collecting plate 8. One end of the pole 3 is electrically connected to the guide bar 7 through the conductive sheet 2, and the other end is electrically connected to the collecting plate 8, thereby realizing the electrical connection between the collecting plate 8 and the guide bar 7. The conductive sheet 2 and the pole 3 in the battery cover assembly are split structures, which reduces the processing difficulty of the pole 3. For example, the pole 3 can be stamped to make the dimensional accuracy of the connecting wall 32 higher. The connecting wall 32 with a preset wall thickness will not be affected by the assembly process and subsequent processes, which is particularly beneficial for the welding connection between the collecting plate 8 and the pole 3, and can improve the consistency and stability of the welding, thereby improving the yield of the battery packaging and the stability of the battery.

[0040] In this embodiment, the pole 3 is a stamping structure, which improves the dimensional accuracy of the pole 3 compared to upsetting. In this embodiment, the pole 3 is in the shape of a Chinese character "X".

[0041] In this embodiment, the outer wall of the pole 3 is stepped, and the pole 3 includes a large diameter section 34 and a small diameter section 35. A stepped surface 36 is provided between the large diameter section 34 and the small diameter section 35. The first flange 31 is provided at the end of the large diameter section 34 away from the small diameter section 35, and the connecting wall 32 is provided at the end of the small diameter section 35 away from the large diameter section 34. The large diameter section 34 is passed through the first connecting hole 11, and the small diameter section 35 is passed through the second connecting hole 21. The conductive sheet 2 is partially overlapped on the stepped surface 36. After the second flange 33 is riveted to the conductive sheet 2, the second flange 33 and the stepped surface 36 clamp the conductive sheet 2, thereby achieving a fixed connection between the conductive sheet 2 and the pole 3.

[0042] Optionally, a sealing ring 4 is provided between the large-diameter section 34 and the inner wall of the first connection hole 11 and / or between the first flange 31 and the inner wall of the cover plate 1. In this embodiment, a sealing ring 4 is provided between the large-diameter section 34 and the inner wall of the first connection hole 11, and between the first flange 31 and the inner wall of the cover plate 1. When the terminal 3 and the cover plate 1 are assembled, the terminal 3 and the cover plate 1 compress the sealing ring 4, thereby ensuring that the sealing performance inside the battery meets the requirements.

[0043] Optionally, as shown in Figures 1 to 3, a rivet groove 22 is provided at one end of the second connecting hole 21 away from the first connecting hole 11, and the second flange 33 is folded outward and embedded in the rivet groove 22. After the second flange 33 is embedded in the rivet groove 22, the flatness of the outer side of the battery cover assembly can be ensured, the contact area between the guide bar 7 and the conductive sheet 2 is increased, and the connection strength is improved.

[0044] Optionally, the second flange 33 is welded to the conductive sheet 2 , which, on the one hand, increases the connection strength between the conductive sheet 2 and the pole 3 ; on the other hand, improves the reliability of the electrical connection between the conductive sheet 2 and the pole 3 .

[0045] In this embodiment, a first insulating ring 5 is provided between the conductive sheet 2 and the cover plate 1 to provide insulation between the conductive sheet 2 and the cover plate 1. Optionally, a positioning groove 51 is provided on the side of the first insulating ring 5 facing away from the cover plate 1. The conductive sheet 2 is embedded in the positioning groove 51, which improves the installation accuracy of the conductive sheet 2 and facilitates riveting or welding of the conductive sheet 2 to the pole 3.

[0046] In this embodiment, a second insulating ring 6 is provided between the first flange 31 and the cover plate 1 to achieve insulation between the pole 3 and the cover plate 1 .

[0047] This embodiment also provides a power battery, as shown in Figures 4 and 5, including a guide bar 7, a collecting plate 8 and the above-mentioned battery cover assembly, the guide bar 7 is welded to the conductive sheet 2, and the inner side of the connecting wall 32 is welded to the collecting plate 8.

Claims

1. A battery cover assembly, comprising: A cover plate piece (1), the cover plate piece (1) being provided with a first connection hole (11); A conductive piece (2), the conductive piece (2) being provided with a second connection hole (21), the conductive piece (2) being installed on the outer side of the cover plate piece (1), and the conductive piece (2) being configured as a welding current collector row (7); A pole column (3), a first flanging (31) being turned outwards at the first end of the pole column (3), a connection wall (32) with a preset wall thickness being provided at the second end of the pole column (3), the inner side of the connection wall (32) being configured to be welded to a current collector plate (8), a second flanging (33) being provided at the outer edge of the connection wall (32), after the second end of the pole column (3) passes through the inside of the cover plate piece (1) and sequentially passes through the first connection hole (11) and the second connection hole (21), the first flanging (31) abuts against the inner wall of the cover plate piece (1); and the second flanging (33) is turned outwards to rivet the side of the conductive piece (2) away from the cover plate piece (1).

2. The battery cover assembly according to claim 1, wherein, The outer wall of the pole column (3) is stepped, the pole column (3) includes a large-diameter section (34) and a small-diameter section (35), a stepped surface (36) is provided between the large-diameter section (34) and the small-diameter section (35), the first flanging (31) is provided at one end of the large-diameter section (34) away from the small-diameter section (35), the connection wall (32) is provided at one end of the small-diameter section (35) away from the large-diameter section (34), the large-diameter section (34) passes through the first connection hole (11), the small-diameter section (35) passes through the second connection hole (21), and a part of the conductive piece (2) overlaps on the stepped surface (36).

3. The battery cover assembly according to claim 2, wherein, A sealing ring (4) is provided between at least one of the inner wall of the large-diameter section (34) and the first connection hole (11) or between the first flanging (31) and the inner wall of the cover plate piece (1).

4. The battery cover assembly according to claim 1, wherein, A riveting groove (22) is provided at one end of the second connection hole (21) away from the first connection hole (11), and after the second flanging (33) is turned outwards, it is embedded in the riveting groove (22).

5. The battery cover assembly according to claim 1, wherein, The second flanging (33) is welded and connected to the conductive piece (2).

6. The battery cover assembly according to claim 1, wherein, A first insulating ring (5) is provided between the conductive piece (2) and the cover plate piece (1).

7. The battery cover assembly according to claim 6, wherein, A positioning groove (51) is provided on the side of the first insulating ring (5) facing away from the cover plate piece (1), and the conductive piece (2) is embedded in the positioning groove (51).

8. The battery cover assembly according to claim 1, wherein, A second insulating ring (6) is provided between the first flanging (31) and the cover plate piece (1).

9. The battery cover assembly according to any one of claims 1-8, wherein, The pole column (3) is a stamping structure.

10. A power battery, comprising a current collector row (7), a current collector plate (8) and the battery cover assembly according to any one of claims 1-9, the current collector row (7) being welded and connected to the conductive piece (2), and the current collector plate (8) being welded and connected to the inner side of the connection wall (32).

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