Top cover plate and battery

Abstract

A top cover plate, comprising a polished aluminum sheet (1), a terminal post (2), a pressing block (3), upper plastic (4) and a sealing member (5), wherein the terminal post (2) sequentially passes through through-holes in the polished aluminum sheet (1), the upper plastic (4) and the pressing block (3); the upper plastic (4) is sandwiched between the polished aluminum sheet (1) and the pressing block (3); the sealing member (5) is sleeved on the terminal post (2); and the sealing member (5) comprises a tubular portion (51), a cutting ring (511) being annularly provided at a first end of the tubular portion (51) in an axial direction of the tubular portion, the cutting ring (511) being arranged between the first end of the tubular portion (51) and the pressing block (3), the hardness of the cutting ring (511) being greater than the hardness of other structures of the tubular portion (51), the cutting ring (511) abutting against the pressing block (3), and the tubular portion (51) being partially sandwiched between the terminal post (2) and an inner wall of the through-hole in the upper plastic (4), and being partially sandwiched between the terminal post (2) and an inner wall of the through-hole in the polished aluminum sheet (1).

Description

Top cover and battery

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 20, 2023, with application number 202323484950.X, the entire contents of which are incorporated by reference into this application. Technical Field

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

[0003] In related art, the top cover of a battery is equipped with a pole, a pressure block, and a bare aluminum sheet. The bare aluminum sheet must be insulated from both the pole and the pressure block. Grooves are machined into the sides of the pole, leaving residual metal wire on the pole. During subsequent assembly, the metal wire may become trapped between the pole, pressure block, and bare aluminum sheet. The other end of the metal wire on the pole may even pass through the gap and contact the bare aluminum sheet, causing poor insulation on the cover. Summary of the Invention

[0004] The present application provides a top cover plate and a battery, which can prevent the metal wire remaining on the pole from contacting the bare aluminum sheet, thereby preventing the problem of poor insulation.

[0005] The present application provides a top cover plate, comprising a bare aluminum sheet, a pole and a pressing block, the top cover plate further comprising an upper plastic and a seal, the pole passing through the bare aluminum sheet, the upper plastic and the through-holes on the pressing block in sequence, the upper plastic being clamped between the bare aluminum sheet and the pressing block, the seal being sleeved on the pole, the seal comprising a tubular portion, the tubular portion being provided with a cutting ring around its first end along its own axial direction, the cutting ring being arranged between the first end of the tubular portion and the pressing block, the hardness of the cutting ring being greater than the hardness of the remaining structure of the tubular portion, the cutting ring being in contact with the pressing block, the tubular portion being partially clamped between the pole and the inner wall of the through-hole of the upper plastic, and the tubular portion being partially clamped between the pole and the inner wall of the through-hole of the bare aluminum sheet.

[0006] In some embodiments, the inner wall of the through hole of the upper plastic abuts against the side surface of the tubular portion.

[0007] In some embodiments, the cross-section of the seal is an L-shaped structure, and the seal further includes a sealing ring connected to the second end of the tubular portion along its own axial direction, and the inner wall of the sealing ring and the inner wall of the tubular portion are on the same curved surface.

[0008] In some embodiments, a surface of the sealing ring facing the pressing block abuts against a surface of the plain aluminum sheet facing away from the pressing block.

[0009] In some embodiments, the top cover plate further includes a lower plastic, the seal further includes a sealing ring, the pole portion is passed through the through hole of the lower plastic, and the inner wall of the through hole of the lower plastic is circumferentially connected to the outer ring of the sealing ring.

[0010] In some embodiments, the pole includes an external connecting portion and an internal connecting portion connected along its own axial direction, the diameter of the internal connecting portion is larger than the maximum diameter of the external connecting portion, the external connecting portion is inserted into the through holes of the bare aluminum sheet, the upper plastic, the pressure block and the lower plastic, and the surface of the internal connecting portion facing the pressure block contacts the surface of the lower plastic facing away from the pressure block.

[0011] In some embodiments, an end of the cutting ring away from the first end of the tubular portion has an acute cutting angle.

[0012] In some embodiments, the cutting ring includes a first frustum surface and a cylindrical surface that are coaxially arranged, the cylindrical surface is arranged close to the pole, and the angle between the first frustum surface and the cylindrical surface is the acute cutting angle.

[0013] In some embodiments, the inner wall of the through hole of the upper plastic is a second frustum surface, and the second frustum surface is sealed with the first frustum surface.

[0014] The present application also provides a battery, comprising a shell and the above-mentioned top cover plate, wherein the top cover plate is arranged at the opening of the shell to enclose and form a sealed inner cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIG1 is a schematic structural diagram of a top cover plate provided in an embodiment of the present application;

[0016] FIG2 is a partial cross-sectional view of a top cover provided in an embodiment of the present application;

[0017] FIG3 is another partial cross-sectional view of the top cover provided in an embodiment of the present application;

[0018] FIG4 is a partial cross-sectional enlarged view of the top cover provided in an embodiment of the present application;

[0019] FIG5 is a schematic structural diagram of a battery provided in an embodiment of the present application.

[0020] In the picture:

[0021] 1. Plain aluminum sheet;

[0022] 2. Pole; 21. External connection; 22. Internal connection;

[0023] 3. Briquetting;

[0024] 4. Apply plastic; 41. Second cone surface;

[0025] 5. Sealing member; 51. Tubular portion; 511. Cutting ring; 5111. First frustum surface; 5112. Cylindrical surface; 52. Sealing ring;

[0026] 6. Remove plastic;

[0027] 7. Shell;

[0028] 8. Battery cell. DETAILED DESCRIPTION

[0029] In the description of this application, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed or detachable connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this application as appropriate.

[0030] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. 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.

[0031] As shown in Figures 1 to 3, the top cover plate of this embodiment includes a bare aluminum sheet 1, a pole 2 and a pressing block 3. The top cover plate also includes an upper plastic 4 and a seal 5. The pole 2 passes through the through holes on the bare aluminum sheet 1, the upper plastic 4 and the pressing block 3 in sequence. The upper plastic 4 is clamped between the bare aluminum sheet 1 and the pressing block 3. The seal 5 is sleeved on the pole 2. The seal 5 includes a tubular portion 51. The tubular portion 51 is provided with a cutting ring 511 along the first end of its own axial direction. The cutting ring 511 is arranged between the first end of the tubular portion 51 and the pressing block 3. The hardness of the cutting ring 511 is greater than the hardness of the remaining structure of the tubular portion 51. The cutting ring 511 abuts against the pressing block 3. Part of the tubular portion 51 is clamped between the pole 2 and the inner wall of the through hole of the upper plastic 4, and part is clamped between the pole 2 and the inner wall of the through hole of the bare aluminum sheet 1.

[0032] As shown in Figure 4, the metal wire on the pole 2 needs to pass through the gap between the pole 2 and the tubular portion 51, bypass the gap between the tubular portion 51 and the pressing block 3, and then pass through the gap between the tubular portion 51 and the upper plastic 4 before it can contact the bare aluminum sheet 1. This longer travel distance prevents insufficiently long metal wire from contacting the bare aluminum sheet 1. In addition, the cutting ring 511 on the tubular portion 51 has a greater hardness than the rest of the tubular portion 51. Because one end of the cutting ring 511 is flush with the surface of the pressing block 3, the portion of the metal wire squeezed between the cutting ring 511 and the pressing block 3 is cut off. Even if one end of the severed metal wire contacts the bare aluminum sheet 1, it will not be able to connect electrically. Therefore, the top cover plate can prevent the remaining metal wire on the pole 2 from contacting the bare aluminum sheet 1, thereby preventing poor insulation.

[0033] Continuing to refer to Figures 1 to 3, optionally, the inner wall of the through hole of the upper plastic 4 abuts against the side of the tubular portion 51. Minimizing the distance between the inner wall of the through hole of the upper plastic 4 and the side of the tubular portion 51 as much as possible can avoid the metal wire from passing there. The abutment between the two can isolate the pressing block 3 from the bare aluminum sheet 1.

[0034] Optionally, the seal 5 has an L-shaped cross-section and further includes a sealing ring 52 connected to the second axial end of the tubular portion 51. The inner wall of the sealing ring 52 is coplanar with the inner wall of the tubular portion 51. Optionally, the surface of the sealing ring 52 facing the pressing block 3 abuts against the surface of the bare aluminum sheet 1 facing away from the pressing block 3. The sealing ring 52 may wrap around a portion of the bare aluminum sheet 1 below the bare aluminum sheet 1.

[0035] Optionally, the top cover plate also includes a lower plastic 6, the seal 5 also includes a sealing ring 52, the pole 2 is partially passed through the through hole of the lower plastic 6, the inner wall of the through hole of the lower plastic 6 is circumferentially connected to the outer ring of the sealing ring 52, and the lower plastic 6 is attached to the surface of the smooth aluminum sheet 1 facing away from the pressing block 3.

[0036] Optionally, the pole 2 includes an outer connecting portion 21 and an inner connecting portion 22 connected along its axial direction. The diameter of the inner connecting portion 22 is larger than the maximum diameter of the outer connecting portion 21. The outer connecting portion 21 is inserted into the through-holes of the bare aluminum sheet 1, the upper plastic 4, the pressing block 3, and the lower plastic 6. The surface of the inner connecting portion 22 facing the pressing block 3 contacts the surface of the lower plastic 6 facing away from the pressing block 3. The surface of the inner connecting portion 22 facing the pressing block 3 also contacts the surface of the sealing ring 52 facing away from the pressing block 3. The inner wall of the through-hole of the lower plastic 6 is circumferentially connected to the outer ring of the sealing ring 52 to prevent the bare aluminum sheet 1 from contacting the inner connecting portion 22 of the pole 2.

[0037] As shown in FIG3 , in order to improve the cutting ability of the cutting ring 511 , optionally, one end of the cutting ring 511 away from the first end of the tubular portion 51 has an acute cutting angle, which can improve the cutting ability of the metal wire.

[0038] Optionally, the cutting ring 511 includes a coaxially arranged first conical surface 5111 and a cylindrical surface 5112. The cylindrical surface 5112 is positioned adjacent to the pole 2, and the angle between the first conical surface 5111 and the cylindrical surface 5112 is an acute cutting angle. Optionally, the inner wall of the through-hole in the upper plastic 4 forms a second conical surface 41. The contact surface between the second conical surface 41 and the first conical surface 5111 is sealed to prevent any uncut wire from passing through the gap between the inner wall of the through-hole in the upper plastic 4 and the first conical surface 5111.

[0039] The present application also provides a battery comprising a housing and the aforementioned top cover plate, wherein the top cover plate is disposed at the opening of the housing to enclose and form a sealed inner cavity. The battery can prevent residual metal wire on the pole 2 from contacting the bare aluminum sheet 1, thereby preventing poor insulation.

[0040] As shown in Figure 5, in some embodiments, the battery may include a shell 7, a battery cell 8 and the above-mentioned top cover plate, and the top cover plate is arranged at the opening of the shell 7 to form a sealed inner cavity with the shell 7; the battery cell 8 is arranged in the sealed inner cavity and connected to the pole 2 on the top cover plate.

Claims

1. A top cover plate, comprising a plain aluminum sheet (1), a pole (2), a pressing block (3), an upper plastic (4) and a sealing member (5), The pole (2) passes through the through holes on the bare aluminum sheet (1), the upper plastic (4) and the pressing block (3) in sequence; the upper plastic (4) is sandwiched between the bare aluminum sheet (1) and the pressing block (3); the sealing member (5) is sleeved on the pole (2); the sealing member (5) comprises a tubular portion (51); a cutting ring (511) is provided along the first end of the tubular portion (51) along its axial direction; the cutting ring (511) is arranged at Between the first end of the tubular portion (51) and the pressing block (3), the hardness of the cutting ring (511) is greater than the hardness of the remaining structure of the tubular portion (51), the cutting ring (511) is in contact with the pressing block (3), the tubular portion (51) is partially sandwiched between the pole (2) and the inner wall of the through hole of the upper plastic (4), and the tubular portion (51) is partially sandwiched between the pole (2) and the inner wall of the through hole of the bare aluminum sheet (1).

2. The top cover plate according to claim 1, wherein: The inner wall of the through hole of the upper plastic (4) abuts against the side surface of the tubular portion (51).

3. The top cover plate according to claim 1, wherein: The cross section of the sealing member (5) is an L-shaped structure. The sealing member (5) further comprises a sealing ring (52). The sealing ring (52) is connected to the second end of the tubular portion (51) along its own axial direction. The inner wall of the sealing ring (52) and the inner wall of the tubular portion (51) are on the same curved surface.

4. The top cover plate according to claim 3, wherein: The surface of the sealing ring (52) facing the pressing block (3) abuts against the surface of the smooth aluminum sheet (1) facing away from the pressing block (3).

5. The top cover plate according to any one of claims 3-4, further comprising a lower plastic (6), wherein the pole (2) portion is penetrated through a through hole of the lower plastic (6), and an inner wall of the through hole of the lower plastic (6) is circumferentially connected to an outer ring of the sealing ring (52).

6. The top cover plate according to claim 5, wherein: The pole (2) comprises an outer connecting portion (21) and an inner connecting portion (22) connected along its own axial direction, the diameter of the inner connecting portion (22) is larger than the maximum diameter of the outer connecting portion (21), the outer connecting portion (21) is inserted into the through holes of the bare aluminum sheet (1), the upper plastic (4), the pressing block (3) and the lower plastic (6), and the surface of the inner connecting portion (22) facing the pressing block (3) contacts the surface of the lower plastic (6) facing away from the pressing block (3).

7. The top cover plate according to any one of claims 1 to 6, wherein: An end of the cutting ring (511) away from the first end of the tubular portion (51) has an acute cutting angle.

8. The top cover plate according to claim 7, wherein: The cutting ring (511) comprises a first frustum surface (5111) and a cylindrical surface (5112) which are coaxially arranged, the cylindrical surface (5112) being arranged close to the pole (2), and the angle between the first frustum surface (5111) and the cylindrical surface (5112) being the acute cutting angle.

9. The top cover plate according to claim 8, wherein: The inner wall of the through hole of the upper plastic (4) is a second frustum surface (41), and the contact surface between the second frustum surface (41) and the first frustum surface (5111) is sealed.

10. A battery, comprising a shell (7), a battery cell (8) and a top cover plate as claimed in any one of claims 1 to 9, wherein the top cover plate is arranged at the opening of the shell (1) to form a sealed inner cavity together with the shell (7); the battery cell (8) is arranged in the sealed inner cavity and connected to the pole (2) on the top cover plate.

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