Battery cover and battery

Abstract

The present invention relates to the field of battery technology, and discloses a battery top cover and a battery. The battery top cover includes a cover plate, a pole assembly and a lower plastic. The cover plate is provided with a first mounting hole, and the lower plastic is provided with a second mounting hole. The first mounting hole and the second mounting hole are arranged correspondingly. The pole assembly is arranged in the first mounting hole, and the lower end of the pole assembly extends into the second mounting hole; the pole assembly includes a support ring and a pole. The support ring is fixed in the first mounting hole; the pole includes a base, and the first end face of the base is provided with a first boss, and the diameter of the first boss is smaller than the diameter of the base; the base is arranged in the support ring, and the upper surface of the base is flush with the upper surface of the support ring, and the thickness of the pole along the axial direction is greater than the thickness of the support ring. The present invention omits the positive electrode riveting block and the negative electrode riveting block, reduces the number of parts, reduces the weight of the entire cover plate, reduces the cost of parts, and reduces the assembly process; the height of the pole is reduced, and the occupied space becomes smaller, which is conducive to improving the energy density of the battery.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery top cover and a battery. Background Art

[0002] As lithium-ion battery technology becomes increasingly mature, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the performance and safety of lithium-ion batteries are increasing.

[0003] The battery includes a shell and a top cover arranged on the top of the shell. As an accessory of the lithium-ion battery, the top cover has two functions. First, it isolates the electrode group from the external environment by welding with the shell, thereby playing a sealing role; second, it connects the internal and external circuits, and transmits the internal current of the battery to the outside through the pole of the top cover, thereby playing a guiding role.

[0004] The traditional battery top cover includes a cover plate (plain aluminum sheet), a positive riveted block, a negative riveted block, a positive electrode post, a negative electrode post, a positive upper plastic, a positive lower plastic, a negative upper plastic, a negative lower plastic, a sealing ring, an explosion-proof valve, an explosion-proof valve protective film and other components. The positive electrode post is fixed by the positive riveted block, and the negative electrode post is fixed by the negative riveted block. In this solution, the battery top cover has many structural parts, large mass, cumbersome assembly procedures, and high costs, which is not conducive to reducing the weight and cost of the battery. In addition, this riveted structure also leads to a large distance from the upper surface of the plain aluminum sheet to the upper surface of the riveted block, which is at least 3.2 mm, and the electrode is relatively high, which is not conducive to improving the battery volume and mass energy density. Summary of the invention

[0005] In view of this, the present invention provides a battery top cover and a battery to solve any one of the following technical problems: the battery top cover has many structural parts, large mass, many assembly processes and high cost; the pole is high and occupies a large space, which is not conducive to improving the energy density of the battery.

[0006] In the first aspect, the present invention provides a battery top cover, including a cover plate, a pole assembly and a lower plastic, wherein the cover plate is provided with a first mounting hole, the lower plastic is provided with a second mounting hole, the first mounting hole and the second mounting hole are arranged correspondingly, the pole assembly is arranged in the first mounting hole, and the lower end of the pole assembly extends into the second mounting hole; the pole assembly includes a support ring and a pole. The support ring is fixed in the first mounting hole; the pole includes a base, a first boss is provided on the first end face of the base, and the diameter of the first boss is smaller than the diameter of the base; the base is arranged in the support ring, the upper surface of the base is flush with the upper surface of the support ring, and the thickness of the pole along the axial direction is greater than the thickness of the support ring.

[0007] Beneficial effects: The battery top cover provided by this embodiment, in which the pole is composed of a pole assembly through a support ring, which is assembled in the first mounting hole of the cover plate and the second mounting hole of the lower plastic, eliminating the positive pole riveting block and the negative pole riveting block, reducing the number of parts, reducing the weight of the entire cover plate, reducing the cost of parts, and reducing the number of assembly steps; at the same time, since the positive pole riveting block and the negative pole riveting block are omitted, the height of the pole is reduced, the occupied space becomes smaller, which is beneficial to improving the energy density of the battery.

[0008] In an optional embodiment, the height of the first boss above the first end surface of the substrate is A1, A1≥0.2mm, the radius of the first boss is smaller than the radius of the substrate, and the difference between the radius of the first boss and the radius of the substrate is B1, B1≥0.5mm.

[0009] Beneficial effect: The height of the first boss above the first end face of the base is set to be greater than 0.2 mm. When the base and the cover of the pole are welded, the first end face of the first boss can be higher than the height of the weld between the pole and the cover, which is beneficial for welding the conductive bar and the pole when the battery is grouped, and is not affected by the height of the weld between the pole and the cover, ensuring that the conductive bar and the pole are firmly welded. The radius of the base is at least 0.5 mm larger than the radius of the first convex edge, which is convenient for welding and assembly.

[0010] In an optional embodiment, the support ring includes an annular support ring body, the inner wall of the support ring body is provided with a first radially extending convex edge, a first groove is formed between the first axial end face of the first convex edge and the support ring body, and the base is arranged in the first groove.

[0011] Beneficial effect: By arranging a first convex edge on the inner wall of the support ring body, a first groove is formed between the first convex edge and the support ring body, and the base of the pole is embedded in the first groove, forming a limit between the support ring and the pole, thereby improving the positioning accuracy between the support ring and the pole.

[0012] In an optional embodiment, the pole includes a second boss provided on the second end face of the base, the radius of the second boss is smaller than the radius of the base, the difference between the radius of the second boss and the radius of the base is B2, B2 ≥ 0.5 mm; the diameter of the second boss is equal to the inner diameter of the first flange, the thickness of the second boss is equal to the thickness of the first flange, and the thickness of the second boss is A3, A3 ≥ 0.5 mm.

[0013] Beneficial effect: With such an arrangement, while the base is disposed in the first groove, the side wall of the second boss is connected to the side wall of the first flange, and the end face of the second boss is flush with the second end face of the first flange, and the side wall of the second boss and the side wall of the first flange can be connected by threads or by full-circumferential seam welding.

[0014] In an optional embodiment, the first flange is arranged in the middle of the inner wall of the support ring body; the pole also includes a third boss arranged on the end face of the second boss, the radius of the third boss is smaller than the radius of the second boss, and the difference between the radius of the third boss and the radius of the second boss is B3, B3≥0.5mm; a third groove is formed between the support ring body, the first flange, the second boss and the third boss, and the depth of the third groove is C5, C5≥0.5mm; the battery top cover also includes a sealing ring, which is arranged in the third groove.

[0015] Beneficial effect: With this arrangement, a sealing ring can be arranged in the third groove, the first end face of the sealing ring abuts against the first convex edge and the end face of the second boss, and the second end face of the sealing ring abuts against the cover plate and the lower plastic, thereby playing a sealing role.

[0016] In an optional embodiment, the first mounting hole is a stepped hole, the first mounting hole includes a first hole segment and a second hole segment, the inner diameter of the first hole segment is larger than the inner diameter of the second hole segment, and a step surface is formed between the first hole segment and the second hole segment; the support ring is arranged in the first hole segment, the side wall of the support ring abuts against the inner wall of the first hole segment, and the second end face of the support ring abuts against the step surface.

[0017] Beneficial effect: With such an arrangement, the step surface between the first hole section and the second hole section of the first mounting hole constitutes a limiting structure, which can play a limiting role for the support ring. The support ring is arranged in the first hole section of the first mounting hole, and the outer wall of the support ring abuts against the inner wall of the first hole section, and the second end face of the support ring abuts against the step surface, thereby improving the positioning between the support ring and the cover plate.

[0018] In an optional embodiment, the diameter of the third boss is smaller than the inner diameter of the second hole segment; the lower plastic includes a lower plastic body, the second mounting hole is provided in the lower plastic body, and the inner wall of the second mounting hole of the lower plastic body is provided with an extension portion extending axially, and the extension portion is at least partially provided between the second hole segment of the first mounting hole and the third boss of the pole.

[0019] Beneficial effect: With this arrangement, the third boss of the pole, the extension of the lower plastic and the second hole section of the cover plate are in contact with each other in the radial direction, forming a limit in the radial direction. The support ring, the cover plate and the lower plastic are in contact with each other in the axial direction, forming a limit in the axial direction, thereby achieving a tight connection between the components of the battery top cover.

[0020] In an optional embodiment, along the radial direction, the contact width between the sealing ring and the cover plate is a, the contact width between the sealing ring and the extended portion of the lower plastic is b, and the width of the third groove is E, where E>(a+b).

[0021] Beneficial effect: With this arrangement, the width of the third groove is greater than the width of the sealing ring, and the excess space is a swelling space for the sealing ring, so that the sealing ring can be deformed when assembled in the third groove, filling the third groove to achieve compression sealing, and the sealing effect is good.

[0022] In an optional embodiment, the outer wall of the support ring body is provided with a second flange extending in the radial direction, the radius of the second flange is larger than the radius of the base, the difference between the radius of the second flange and the radius of the base is D1, and D1 ≥ 0.5 mm; the lower end surface of the second flange is flush with the lower end surface of the support ring body, the first mounting hole of the cover plate also includes a third hole section connected to the first hole section, the inner diameter of the third hole section is larger than the inner diameter of the first hole section, the second flange is arranged in the third hole section, and the first end surface of the second flange is flush with the first end surface of the cover plate.

[0023] Beneficial effect: With this arrangement, a limit fit is formed between the second flange and the third hole section of the cover plate, which is beneficial to improving assembly accuracy. The first end face of the second flange is flush with the first end face of the cover plate. When welding is adopted, seam welding of the pole assembly and the cover plate can be achieved. The laser welding head or the workpiece does not need to be tilted, which is convenient for improving production efficiency.

[0024] In a second aspect, the present invention further provides a battery, comprising a shell, a pole group and a battery top cover as described in any one of the above technical solutions, wherein the shell has a receiving cavity; the pole group is arranged in the receiving cavity; the battery top cover is arranged on the shell, and the pole column is conductively connected to the pole group.

[0025] Beneficial effects: Since the battery includes the above-mentioned battery top cover, it has all the beneficial effects of the battery top cover, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A front view of a support ring in a battery top cover according to an embodiment of the present invention;

[0028] Figure 2 A front view of a terminal in a battery top cover according to an embodiment of the present invention;

[0029] Figure 3 for Figure 1 The support ring and Figure 2 A front view of a pole assembly composed of poles shown;

[0030] Figure 4 A front view of another electrode in a battery top cover according to an embodiment of the present invention;

[0031] Figure 5 for Figure 4 Schematic diagram of the dimensions of the battery top cover shown;

[0032] Figure 6 A front view of a support ring in another battery top cover according to an embodiment of the present invention;

[0033] Figure 7 for Figure 6 Schematic diagram of various dimensions of the support ring shown;

[0034] Figure 8 for Figure 4 The poles and Figure 6 A front view of a pole assembly consisting of a support ring as shown;

[0035] Fig. 9 A schematic diagram of the partial structure of a cover plate in a battery top cover according to an embodiment of the present invention;

[0036] Fig.10 A schematic diagram of a partial structure of a battery top cover according to an embodiment of the present invention;

[0037] Fig.11 This is a front view of a support ring in another battery top cover according to an embodiment of the present invention.

[0038] Description of reference numerals:

[0039] 1. Cover plate; 11. First mounting hole; 111. First hole section; 112. Second hole section; 2. Lower plastic; 20. Lower plastic body; 21. Second mounting hole; 22. Extension; 3. Pole assembly; 31. Support ring; 310. Support ring body; 311. First flange; 312. Second flange; 32. Pole; 320. Base; 321. First boss; 322. Second boss; 323. Third boss; 4. Sealing ring. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0041] Combine the following Figures 1 to 11 , describing an embodiment of the present invention.

[0042] According to an embodiment of the present invention, on one hand, a battery top cover is provided, comprising a cover plate 1, a pole assembly 3 and a lower plastic 2, wherein a first mounting hole 11 is provided on the cover plate 1, and a second mounting hole 21 is provided on the lower plastic 2, wherein the first mounting hole 11 and the second mounting hole 21 are arranged correspondingly, and the pole assembly 3 is arranged in the first mounting hole 11, and the lower end of the pole assembly 3 extends into the second mounting hole 21; the pole assembly 3 comprises a support ring 31 and a pole 32. The support ring 31 is fixedly arranged in the first mounting hole 11; the pole 32 comprises a base 320, and a first boss 321 is provided on a first end surface of the base 320, and the diameter of the first boss 321 is smaller than the diameter of the base 320; the base 320 is arranged in the support ring 31, and the upper surface of the base 320 is flush with the upper surface of the support ring 31, and the thickness of the pole 32 along the axial direction is greater than the thickness of the support ring 31.

[0043] The battery top cover provided in this embodiment comprises a pole 32 which is connected to a support ring 31 to form a pole assembly 3, which is assembled in the first mounting hole 11 of the cover plate 1 and the second mounting hole 21 of the lower plastic 2, thereby eliminating the positive pole riveting block and the negative pole riveting block, reducing the number of parts, reducing the weight of the entire cover plate 1, reducing the cost of parts, and reducing the number of assembly steps; at the same time, since the positive pole riveting block and the negative pole riveting block are eliminated, the height of the pole 32 is reduced, and the space occupied becomes smaller, which is beneficial to improving the energy density of the battery.

[0044] Reference Figures 1 to 3 , the thickness of the support ring 31 is H1≥0.5mm, H2≥0.5mm, so that the support ring 31 is easy to assemble with the cover plate 1, the lower plastic 2 and the pole 32, and at the same time, the support ring 31 can provide support and facilitate welding. The thickness of the base 320 of the pole 32 is H3, H3≥1.5mm. After the pole 32 and the support ring 31 are assembled, the first end face of the pole 32 is flush with the first end face of the support ring 31 by means of the assembly tool, that is, Figure 3 In the illustrated position, the upper surface of the base 320 of the pole 32 is flush with the upper surface of the support ring 31. The second end surface of the base 320 of the pole 32 protrudes from the second end surface of the support ring 31, that is, Figure 3 In the embodiment, the lower end surface of the pole 32 protrudes from the lower end surface of the support ring 31 , and the base 320 of the pole 32 of the protruding portion is used to be installed in the first installation hole 11 of the cover plate 1 .

[0045] Since the pole 32 and the support ring 31 are assembled and connected to form the pole assembly 3, the pole assembly 3 is easy to assemble and produce with welding, which can greatly improve the assembly production efficiency. Specifically, the support ring 31 and the pole 32 can be welded or threaded. When welding is used, the support ring 31 is an insulating weldable material. When threaded connection is used, the support ring 31 is an insulating material.

[0046] After the pole assembly 3 is assembled with the cover plate 1, there are two assembly methods according to the thickness of the support ring 31: when the first end surface of the support ring 31 is flush with the first end surface of the cover plate 1, the support ring 31 and the cover plate 1 are assembled by butt welding. When the first end surface of the support ring 31 is higher than the first end surface of the cover plate 1, the support ring 31 and the cover plate 1 are assembled by fillet welding.

[0047] In one embodiment, the height of the first boss 321 above the first end surface of the base 320 is A1, A1≥0.2mm, the radius of the first boss 321 is smaller than the radius of the base 320, and the difference between the radius of the first boss 321 and the radius of the base 320 is B1, B1≥0.5mm.

[0048] The height of the first boss 321 above the first end face of the base 320 is set to be greater than 0.2 mm. When the base 320 of the pole 32 and the cover plate 1 are welded, the first end face of the first boss 321 can be higher than the height of the weld between the pole 32 and the cover plate 1, which is beneficial for welding the conductive bar and the pole 32 when the battery is grouped, and is not affected by the height of the weld between the pole 32 and the cover plate 1, ensuring that the conductive bar and the pole 32 are firmly welded. The radius of the base 320 is at least 0.5 mm larger than the radius of the first convex edge 311, which is convenient for welding and assembly.

[0049] Reference Figures 4 to 10 In one embodiment, the thickness of the base 320 of the pole 32 is A2, A2 ≥ 0.5 mm. The distance between the first end face of the first convex edge 311 and the first end face of the support ring body 310 is C4, C4 = A2, that is, the thickness of the base 320 is equal to the depth of the first groove. In this way, the first end face of the base 320 is flush with the first end face of the support ring 31, and the base 320 and the support ring 31 can be connected by threads or by full circumferential seam welding.

[0050] In one embodiment, the support ring 31 includes an annular support ring body 310, the inner wall of the support ring body 310 is provided with a first flange 311 extending radially, a first groove is formed between the first axial end surface of the first flange 311 and the support ring body 310, and the base 320 is arranged in the first groove.

[0051] By setting a first protrusion 311 on the inner wall of the support ring body 310, a first groove is formed between the first protrusion 311 and the support ring body 310, and the base 320 of the pole 32 is embedded in the first groove to form a limit between the support ring 31 and the pole 32, thereby improving the positioning accuracy between the support ring 31 and the pole 32.

[0052] In one embodiment, the pole 32 includes a second boss 322 provided on the second end face of the base 320, the radius of the second boss 322 is smaller than the radius of the base 320, the difference between the radius of the second boss 322 and the radius of the base 320 is B2, B2 ≥ 0.5 mm; the diameter of the second boss 322 is equal to the inner diameter of the first flange 311, the thickness of the second boss 322 is equal to the thickness of the first flange 311, and the thickness of the second boss 322 is A3, A3 ≥ 0.5 mm.

[0053] In this way, when the base 320 is arranged in the first groove, the side wall of the second boss 322 is connected to the side wall of the first flange 311, and the end face of the second boss 322 is flush with the second end face of the first flange 311, and the side wall of the second boss 322 and the side wall of the first flange 311 can be connected by threads or by full-circle seam welding.

[0054] Specifically, the thickness of the first protruding edge 311 is C3=A3; the width of the first protruding edge 311 extending in the radial direction is C2, and C2=B2.

[0055] The axial thickness of the support ring body 310 is H1, H1 ≥ 0.5 mm. This arrangement facilitates the assembly and welding of the support ring 31.

[0056] The support ring 31 and the cover plate 1 , the support ring body 310 and the base 320 , and the first protrusion 311 and the second boss 322 are threadedly connected or welded.

[0057] In one embodiment, the first flange 311 is arranged in the middle of the inner wall of the support ring body 310; the pole 32 also includes a third boss 323 arranged on the end face of the second boss 322, the radius of the third boss 323 is smaller than the radius of the second boss 322, and the difference between the radius of the third boss 323 and the radius of the second boss 322 is B3, B3 ≥ 0.5mm; a third groove is formed between the support ring body 310, the first flange 311, the second boss 322 and the third boss 323, and the depth of the third groove is C5, C5 ≥ 0.5mm; the battery top cover also includes a sealing ring 4, and the sealing ring 4 is arranged in the third groove.

[0058] In this way, a sealing ring 4 can be arranged in the third groove, and the first end surface of the sealing ring 4 abuts against the end surfaces of the first convex edge 311 and the second boss 322, and the second end surface of the sealing ring 4 abuts against the cover plate 1 and the lower plastic 2 to play a sealing role.

[0059] In one embodiment, the first mounting hole 11 is a stepped hole, and the first mounting hole 11 includes a first hole section 111 and a second hole section 112. The inner diameter of the first hole section 111 is larger than the inner diameter of the second hole section 112, and a step surface is formed between the first hole section 111 and the second hole section 112; the support ring 31 is arranged in the first hole section 111, the side wall of the support ring 31 abuts against the inner wall of the first hole section 111, and the second end face of the support ring 31 abuts against the step surface.

[0060] In this way, the step surface between the first hole section 111 and the second hole section 112 of the first mounting hole 11 constitutes a limiting structure, which can play a limiting role for the support ring 31. The support ring 31 is arranged in the first hole section 111 of the first mounting hole 11, and the outer wall of the support ring 31 abuts against the inner wall of the first hole section 111, and the second end face of the support ring 31 abuts against the step surface, thereby improving the positioning between the support ring 31 and the cover plate 1.

[0061] In one embodiment, the diameter of the third boss 323 is smaller than the inner diameter of the second hole section 112; the lower plastic 2 includes a lower plastic body 20, the second mounting hole 21 is provided in the lower plastic body 20, and the inner wall of the second mounting hole 21 of the lower plastic body 20 is provided with an extension portion 22 extending axially, and the extension portion 22 is at least partially provided between the second hole section 112 of the first mounting hole 11 and the third boss 323 of the pole 32.

[0062] In this way, in the radial direction, the third boss 323 of the pole 32, the extension 22 of the lower plastic 2 and the second hole section 112 of the cover plate 1 are abutted in sequence to form a radial limit. In the axial direction, the support ring 31, the cover plate 1 and the lower plastic 2 are abutted in sequence to form an axial limit, thereby achieving a tight connection between the components of the battery top cover.

[0063] In one embodiment, along the radial direction, the contact width between the sealing ring 4 and the cover plate 1 is a, the contact width between the sealing ring 4 and the extension 22 of the lower plastic 2 is b, and the width of the third groove is E, E>(a+b).

[0064] In this arrangement, the width of the third groove is greater than the width of the sealing ring 4, and the excess space is a swelling space for the sealing ring 4, so that the sealing ring 4 can be deformed when assembled in the third groove, filling the third groove to achieve compression sealing, with good sealing effect.

[0065] Reference Fig.11In one embodiment, the outer wall of the support ring body 310 is provided with a second flange 312 extending in the radial direction, the radius of the second flange 312 is greater than the radius of the base 320, and the difference between the radius of the second flange 312 and the radius of the base 320 is D1, and D1 ≥ 0.5 mm; the lower end surface of the second flange 312 is flush with the lower end surface of the support ring body 310, and the first mounting hole 11 of the cover plate 1 also includes a third hole section connected to the first hole section 111, and the inner diameter of the third hole section is greater than the inner diameter of the first hole section 111. The second flange 312 is arranged in the third hole section, and the first end surface of the second flange 312 is flush with the first end surface of the cover plate 1.

[0066] With this arrangement, a limiting fit is formed between the second flange 312 and the third hole section of the cover plate 1, which is beneficial to improving assembly accuracy. The first end face of the second flange 312 is flush with the first end face of the cover plate 1. When welding is adopted, seam welding of the pole assembly 3 and the cover plate 1 can be achieved, and the laser welding head or the workpiece does not need to be tilted, which is convenient for improving production efficiency.

[0067] Specifically, the depth of the third hole section of the first mounting hole 11 of the cover plate 1 along the axial direction is equal to the thickness of the second flange 312. The thickness of the second flange 312 is D2, and D2≥0.5 mm.

[0068] Compared with the previous design, the battery top cover provided in this embodiment has a pole assembly 3 consisting of a support ring 31 and a pole 32, and the component composition is reduced, which reduces the weight of the entire cover 1, reduces the cost of parts, and effectively improves the mass energy density of the battery; the height of the pole 32 can be reduced, which can effectively increase the effective space inside the battery, greatly improving the volume energy density of the battery.

[0069] According to an embodiment of the present invention, on the other hand, a battery is further provided, comprising a shell, a pole group and a battery top cover as described in any one of the above technical solutions, wherein the shell has a receiving cavity; the pole group is arranged in the receiving cavity; the battery top cover is arranged on the shell, and the pole 32 is conductively connected to the pole group.

[0070] Since the battery includes the above-mentioned battery top cover, it has all the beneficial effects of the battery top cover, which will not be described in detail here.

[0071] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery top cover, characterized in that: The invention comprises a cover plate (1), a pole assembly (3) and a lower plastic (2), wherein the cover plate (1) is provided with a first mounting hole (11), the lower plastic (2) is provided with a second mounting hole (21), the first mounting hole (11) and the second mounting hole (21) are arranged correspondingly, the pole assembly (3) is arranged in the first mounting hole (11), and the lower end of the pole assembly (3) extends into the second mounting hole (21); The pole assembly (3) comprises: A support ring (31), the support ring (31) being fixedly disposed in the first mounting hole (11); A pole (32), the pole (32) comprising a base (320), a first end surface of the base (320) being provided with a first boss (321), the diameter of the first boss (321) being smaller than the diameter of the base (320); the base (320) being arranged in the support ring (31), the upper surface of the base (320) being flush with the upper surface of the support ring (31), and the thickness of the pole (32) along the axial direction being greater than the thickness of the support ring (31); The support ring (31) comprises an annular support ring body (310), the inner wall of the support ring body (310) is provided with a first convex edge (311) extending in the radial direction, a first groove is formed between a first end surface of the first convex edge (311) in the axial direction and the support ring body (310), and the base (320) is arranged in the first groove; The pole (32) includes a second boss (322) provided on the second end surface of the base (320), the radius of the second boss (322) is smaller than the radius of the base (320), the pole (32) also includes a third boss (323) provided on the end surface of the second boss (322), the radius of the third boss (323) is smaller than the radius of the second boss (322), and a third groove is formed between the support ring body (310), the first convex edge (311), the second boss (322) and the third boss (323); The battery top cover also includes a sealing ring (4), and the sealing ring (4) is arranged in the third groove; The support ring (31) and the cover plate (1), or the support ring body (310) and the base (320), or the first flange (311) and the second boss (322) are connected by thread or welding.

2. The battery top cover according to claim 1, characterized in that: The height of the first boss (321) above the first end surface of the base (320) is A1, A1≥0.2mm, the radius of the first boss (321) is smaller than the radius of the base (320), and the difference between the radius of the first boss (321) and the radius of the base (320) is B1, B1≥0.5mm.

3. The battery top cover according to claim 1, characterized in that: The difference between the radius of the second boss (322) and the radius of the base (320) is B2, and B2 is ≥ 0.5 mm; the diameter of the second boss (322) is equal to the inner diameter of the first flange (311), the protruding thickness of the second boss (322) is equal to the thickness of the first flange (311), and the thickness of the second boss (322) is A3, and A3 is ≥ 0.5 mm.

4. The battery top cover according to claim 3, characterized in that: The first convex edge (311) is arranged in the middle of the inner wall of the support ring body (310); the difference between the radius of the third boss (323) and the radius of the second boss (322) is B3, B3≥0.5mm; the depth of the third groove is C5, C5≥0.5mm.

5. The battery top cover according to claim 4, characterized in that: The first mounting hole (11) is a stepped hole, comprising a first hole section (111) and a second hole section (112), the inner diameter of the first hole section (111) being greater than the inner diameter of the second hole section (112), and a step surface being formed between the first hole section (111) and the second hole section (112); the support ring (31) is arranged in the first hole section (111), the side wall of the support ring (31) abuts against the inner wall of the first hole section (111), and the second end face of the support ring (31) abuts against the step surface.

6. The battery top cover according to claim 5, characterized in that: The diameter of the third boss (323) is smaller than the inner diameter of the second hole section (112); the lower plastic (2) comprises a lower plastic body (20); the second mounting hole (21) is arranged in the lower plastic body (20); the inner wall of the second mounting hole (21) of the lower plastic body (20) is provided with an extension portion (22) extending in the axial direction; the extension portion (22) is at least partially arranged between the second hole section (112) of the first mounting hole (11) and the third boss (323) of the pole (32).

7. The battery top cover according to claim 1, characterized in that: The first end surface of the sealing ring (4) abuts against the end surfaces of the first convex edge (311) and the second boss (322), and the second end surface of the sealing ring (4) abuts against the cover plate (1) and the lower plastic (2).

8. The battery top cover according to claim 4, characterized in that: In the radial direction, the contact width between the sealing ring (4) and the cover plate (1) is a, the contact width between the sealing ring (4) and the extension (22) of the lower plastic (2) is b, and the width of the third groove is E, where E>(a+b).

9. The battery top cover according to claim 5, characterized in that: The outer wall of the support ring body (310) is provided with a second protrusion (312) extending in the radial direction, the radius of the second protrusion (312) is greater than the radius of the base (320), the difference between the radius of the second protrusion (312) and the radius of the base (320) is D1, and D1 is ≥ 0.5 mm; the lower end surface of the second protrusion (312) is flush with the lower end surface of the support ring body (310), the first mounting hole (11) of the cover plate (1) also includes a third hole section connected to the first hole section (111), the inner diameter of the third hole section is greater than the inner diameter of the first hole section (111), the second protrusion (312) is arranged in the third hole section, and the first end surface of the second protrusion (312) is flush with the first end surface of the cover plate (1).

10. A battery, characterized in that: include: A housing having a receiving cavity; A pole group, the pole group is arranged in the accommodating cavity; The battery top cover according to any one of claims 1 to 8, wherein the battery top cover is arranged on the shell, and the pole (32) is conductively connected to the pole group.

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