Battery top cover and battery

Abstract

A battery top cover and a battery, relating to the technical field of batteries. The battery top cover comprises a cover plate (1), a post assembly (3) and a lower plastic piece (2). The cover plate (1) is provided with a first mounting hole (11). The lower plastic piece (2) is provided with a second mounting hole (21). The first mounting hole (11) and the second mounting hole (21) are correspondingly arranged. The post assembly (3) is arranged in the first mounting hole (11), and the lower end of the post assembly (3) extends into the second mounting hole (21). The post assembly (3) comprises a support ring (31) and a post (32). The support ring (31) is fixedly provided in the first mounting hole (11). The post (32) comprises a substrate (320). A first end face of the substrate (320) is provided with a first boss (321). The diameter of the first boss (321) is smaller than the diameter of the substrate (320). The substrate (320) is arranged in the support ring (31). The upper surface of the substrate (320) is flush with the upper surface of the support ring (31). The thickness of the post (32) in the axial direction is greater than the thickness of the support ring (31). By means of the described structure, a positive electrode riveting block and a negative electrode riveting block are omitted, and the number of parts is reduced, such that the weight of the whole cover plate is reduced. The component cost is reduced, and the assembly process is simplified. The height of the post (32) is reduced, the occupied space is reduced, and the energy density of the battery can be improved.

Description

Battery cover and battery

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application number CN202311284950.7, entitled “Battery Top Cover and Battery,” filed with the Patent Office of China on September 28, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery top cover and a battery. Background Art

[0004] 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.

[0005] The battery includes a shell and a top cover on 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, thus 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 poles of the top cover, thus playing a current diversion role.

[0006] The traditional battery top cover includes a cover plate (plain aluminum sheet), a positive electrode riveted block, a negative electrode riveted block, a positive electrode post, a negative electrode post, a positive electrode upper plastic, a positive electrode lower plastic, a negative electrode upper plastic, a negative electrode 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 electrode riveted block, and the negative electrode post is fixed by the negative electrode riveted block. In this solution, the battery top cover has many structural parts, large mass, cumbersome assembly process, and high cost, 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 post is relatively high, which is not conducive to improving the battery volume and mass energy density.

[0007] Application Contents

[0008] In view of this, the present application 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 height is large, occupies a large space, which is not conducive to improving the energy density of the battery.

[0009] In a first aspect, the present application provides a battery top cover, comprising a cover plate, a terminal 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 being arranged correspondingly. The terminal assembly is disposed within the first mounting hole, and the lower end of the terminal assembly extends into the second mounting hole. The terminal assembly comprises a support ring and a terminal. The support ring is fixedly disposed within the first mounting hole. The terminal comprises a base, a first boss being provided on a first end surface of the base, the diameter of the first boss being smaller than the diameter of the base. The base is disposed within the support ring, the upper surface of the base is flush with the upper surface of the support ring, and the axial thickness of the terminal is greater than the thickness of the support ring.

[0010] Beneficial effects: The pole is composed of a pole assembly through a support ring and is assembled in the first mounting hole of the cover and the second mounting hole of the lower plastic, eliminating the positive and negative pole riveting blocks, reducing the number of parts, reducing the weight of the entire cover, reducing the cost of parts, and reducing the assembly process; at the same time, since the positive and negative pole riveting blocks are eliminated, the height of the pole is reduced, the space occupied is reduced, and it is beneficial to improve the energy density of the battery.

[0011] In an optional embodiment, the height of the first boss above the first end surface of the base is A1, A1≥0.2mm, the radius of the first boss is smaller than the radius of the base, and the difference between the radius of the first boss and the radius of the base is B1, B1≥0.5mm.

[0012] Beneficial Effects: The height of the first protrusion above the first end surface of the base is set to be greater than 0.2 mm. When the base of the terminal and the cover plate are welded, the first end surface of the first protrusion can be higher than the height of the weld between the terminal and the cover plate. This facilitates welding of the conductive bar to the terminal when the battery is assembled, and is not affected by the height of the weld between the terminal and the cover plate, ensuring a strong weld between the conductive bar and the terminal. The radius of the base is at least 0.5 mm larger than the radius of the first protrusion, which facilitates welding and assembly.

[0013] 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 protrusion extending radially, a first groove is formed between the first axial end face of the first protrusion and the support ring body, and the base is arranged in the first groove.

[0014] 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.

[0015] 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.

[0016] Beneficial effect: With this arrangement, when the base is arranged 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. 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.

[0017] In an optional embodiment, the first protrusion 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 ≥ 0.5 mm; a third groove is formed between the support ring body, the first protrusion, the second boss and the third boss, and the depth of the third groove is C5, C5 ≥ 0.5 mm; the battery top cover also includes a sealing ring, which is arranged in the third groove.

[0018] Beneficial effect: With this arrangement, a sealing ring can be set 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.

[0019] In an optional embodiment, the first mounting hole is a stepped hole, the first mounting hole includes a first hole section and a second hole section, the inner diameter of the first hole section is larger than the inner diameter of the second hole section, and a step surface is formed between the first hole section and the second hole section; the support ring is arranged in the first hole section, the side 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.

[0020] Beneficial effect: With this 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 limit 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 the inner wall of the first hole section, and the second end face of the support ring abuts the step surface, thereby improving the positioning between the support ring and the cover plate.

[0021] 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.

[0022] Beneficial Effect: With this arrangement, radially, the third boss of the terminal, the extension of the lower plastic, and the second hole section of the cover plate sequentially abut against each other, forming a radial limit. Axially, the support ring, the cover plate, and the lower plastic sequentially abut against each other, forming an axial limit, thereby achieving a tight connection between the various components of the battery top cover.

[0023] 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 extension of the lower plastic is b, and the width of the third groove is E, where E>(a+b).

[0024] 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 the expansion space of 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.

[0025] In an optional embodiment, the outer wall of the support ring body is provided with a second protrusion extending in the radial direction, the radius of the second protrusion is larger than the radius of the base, the difference between the radius of the second protrusion and the radius of the base is D1, D1 ≥ 0.5 mm; the lower end face of the second protrusion is flush with the lower end face 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 protrusion is arranged in the third hole section, and the first end face of the second protrusion is flush with the first end face of the cover plate.

[0026] Beneficial effect: With this arrangement, a limiting fit is formed between the second protrusion and the third hole section of the cover plate, which is beneficial to improving the assembly accuracy. The first end face of the second protrusion is flush with the first end face of the cover plate. When welding is adopted, the pole assembly and the cover plate can be seam welded. The laser welding head or the workpiece does not need to be tilted, which is convenient for improving production efficiency.

[0027] In a second aspect, the present application also provides a battery, comprising a shell, an electrode group, and a battery top cover according to any one of the above technical solutions, wherein the shell has a receiving cavity; the electrode group is arranged in the receiving cavity; the battery top cover is arranged on the shell, and the electrode column is conductively connected to the electrode group.

[0028] 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 described here. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0030] FIG1 is a front view of a support ring in a battery top cover according to an embodiment of the present application;

[0031] FIG2 is a front view of a terminal in a battery top cover according to an embodiment of the present application;

[0032] FIG3 is a front view of a pole assembly consisting of the support ring shown in FIG1 and the pole shown in FIG2 ;

[0033] FIG4 is a front view of a terminal in another battery top cover according to an embodiment of the present application;

[0034] FIG5 is a schematic diagram of various dimensions of the battery top cover shown in FIG4 ;

[0035] FIG6 is a front view of a support ring in another battery top cover according to an embodiment of the present application;

[0036] FIG7 is a schematic diagram of various dimensions of the support ring shown in FIG6 ;

[0037] FIG8 is a front view of a pole assembly consisting of the pole shown in FIG4 and the support ring shown in FIG6;

[0038] FIG9 is a schematic diagram of a partial structure of a cover plate in a battery top cover according to an embodiment of the present application;

[0039] FIG10 is a schematic diagram of a partial structure of a battery top cover according to an embodiment of the present application;

[0040] FIG11 is a front view of a support ring in another battery top cover according to an embodiment of the present application.

[0041] Description of reference numerals:

[0042] 1-cover plate; 11-first mounting hole; 111-first hole section; 112-second hole section;

[0043] 2-lower plastic; 20-lower plastic body; 21-second mounting hole; 22-extension portion;

[0044] 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;

[0045] 4-Sealing ring. DETAILED DESCRIPTION

[0046] To make the purpose, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of this application.

[0047] The following describes an embodiment of the present application with reference to FIG1 to FIG11.

[0048] According to an embodiment of the present application, on the one hand, a battery top cover is provided, comprising a cover plate 1, a terminal assembly 3, and a lower plastic 2. The cover plate 1 is provided with a first mounting hole 11, and 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 terminal assembly 3 is arranged in the first mounting hole 11, and the lower end of the terminal assembly 3 extends into the second mounting hole 21. The terminal assembly 3 includes a support ring 31 and a terminal 32. The support ring 31 is fixedly arranged in the first mounting hole 11. The terminal 32 includes a base 320, and a first boss 321 is provided on a first end surface of the base 320. 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. The upper surface of the base 320 is flush with the upper surface of the support ring 31. The thickness of the terminal 32 along the axial direction is greater than the thickness of the support ring 31.

[0049] The battery top cover provided in this embodiment comprises a pole 32 which is formed into a pole assembly 3 through a support ring 31 and 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 and negative pole riveting blocks, reducing the number of parts, the weight of the entire cover plate 1, the parts cost, and the number of assembly steps. At the same time, since the positive and negative pole riveting blocks are eliminated, the height of the pole 32 is reduced, the space occupied is reduced, and this is conducive to improving the energy density of the battery.

[0050] Referring to Figures 1 to 3 , the thickness of the support ring 31 is H1 ≥ 0.5 mm, and H2 ≥ 0.5 mm. This facilitates assembly of the support ring 31 with the cover plate 1, lower plastic 2, and pole 32. Furthermore, the support ring 31 provides support and facilitates welding. The base 320 of the pole 32 has a thickness of H3, H3 ≥ 1.5 mm. After the pole 32 and support ring 31 are assembled, the assembly tool is used to align the first end face of the pole 32 with the first end face of the support ring 31. That is, in the orientation shown in Figure 3 , the upper surface of the base 320 of the pole 32 is flush with the upper surface of the support ring 31.

[0051] The second end face of the base 320 of the pole 32 protrudes from the second end face of the support ring 31, that is, in Figure 3, the lower end face of the pole 32 protrudes from the lower end face of the support ring 31, and the protruding part of the base 320 of the pole 32 is used to be installed in the first mounting hole 11 of the cover plate 1.

[0052] Because the pole 32 and support ring 31 are assembled and connected to form the pole assembly 3, welding facilitates assembly and production, significantly improving assembly efficiency. Specifically, the support ring 31 and pole 32 can be connected by welding or threading. When welding, the support ring 31 should be made of an insulating, weldable material. When threading, the support ring 31 should be made of an insulating material.

[0053] After the pole assembly 3 and the cover plate 1 are assembled, there are two assembly methods depending on the thickness of the support ring 31:

[0054] 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.

[0055] In one embodiment, the height of the first boss 321 above the first end surface of the base 320 is A1, A1 ≥ 0.2 mm, 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 ≥ 0.5 mm.

[0056] The height of the first protrusion 321 above the first end surface of the base 320 is set to be greater than 0.2 mm. When the base 320 of the electrode 32 is welded to the cover plate 1, the first end surface of the first protrusion 321 can be higher than the height of the weld between the electrode 32 and the cover plate 1. This facilitates welding of the conductive bar to the electrode 32 when the battery is assembled, and is not affected by the height of the weld between the electrode 32 and the cover plate 1, ensuring a secure weld between the conductive bar and the electrode 32. The radius of the base 320 is at least 0.5 mm larger than the radius of the first ridge 311, which facilitates welding and assembly.

[0057] Referring to Figures 4 to 10 , in one embodiment, the base 320 of the pole 32 has a thickness A2, where A2 ≥ 0.5 mm. The distance between the first end face of the first flange 311 and the first end face of the support ring body 310 is C4, where C4 = A2. That is, the thickness of the base 320 is equal to the depth of the first groove. This arrangement allows the first end face of the base 320 to be flush with the first end face of the support ring 31. The base 320 and support ring 31 can be connected by threads or a full-circumference seam weld.

[0058] 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 protrusion 311 extending radially, a first groove is formed between the first axial end surface of the first protrusion 311 and the support ring body 310, and the base 320 is arranged in the first groove.

[0059] 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, forming 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.

[0060] 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, and 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 protrusion 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.

[0061] In this arrangement, 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. 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-circumferential seam welding.

[0062] 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.

[0063] The axial thickness of the support ring body 310 is H1, where H1 is ≥ 0.5 mm. This configuration facilitates assembly and welding of the support ring 31.

[0064] 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.

[0065] In one embodiment, the first protrusion 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 ≥ 0.5 mm; a third groove is formed between the support ring body 310, the first protrusion 311, the second boss 322 and the third boss 323, and the depth of the third groove is C5, C5 ≥ 0.5 mm; the battery top cover also includes a sealing ring 4, which is arranged in the third groove.

[0066] In this way, a sealing ring 4 can be set in the third groove, and the first end surface of the sealing ring 4 abuts against the end surface 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.

[0067] 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.

[0068] 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 limit 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 the inner wall of the first hole section 111, and the second end face of the support ring 31 abuts the step surface, thereby improving the positioning between the support ring 31 and the cover plate 1.

[0069] 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, and the second mounting hole 21 is provided 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 axially extending extension portion 22, 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.

[0070] With this arrangement, radially, the third boss 323 of the terminal 32, the extension 22 of the lower plastic 2, and the second hole section 112 of the cover plate 1 sequentially abut against each other, forming a radial limit. Axially, the support ring 31, the cover plate 1, and the lower plastic 2 sequentially abut against each other, forming an axial limit, thereby achieving a tight connection between the various components of the battery top cover.

[0071] 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, where E>(a+b).

[0072] In this arrangement, the width of the third groove is greater than the width of the sealing ring 4, and the excess space is the expansion space of 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 and good sealing effect.

[0073] Referring to Figure 11, in one embodiment, 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, and the difference between the radius of the second protrusion 312 and the radius of the base 320 is D1, D1 ≥ 0.5mm; 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 provided 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.

[0074] With this arrangement, a limiting fit is formed between the second protrusion 312 and the third hole section of the cover plate 1, which is conducive to improving assembly accuracy. The first end face of the second protrusion 312 is flush with the first end face of the cover plate 1. When welding is adopted, the pole assembly 3 and the cover plate 1 can be seam-welded. The laser welding head or the workpiece does not need to be tilted, which is convenient for improving production efficiency.

[0075] Specifically, the axial depth of the third hole section of the first mounting hole 11 of the cover plate 1 is equal to the thickness of the second protrusion 312. The thickness of the second protrusion 312 is D2, and D2 is ≥ 0.5 mm.

[0076] Compared with previous designs, the battery top cover provided in this embodiment has a pole assembly 3 consisting of a support ring 31 and a pole 32. The component composition is reduced, the weight of the entire cover 1 is reduced, the component cost is reduced, and the mass energy density of the battery is effectively improved; the height of the pole 32 can be reduced, which can effectively increase the effective space inside the battery and greatly improve the battery volume energy density.

[0077] According to an embodiment of the present application, on the other hand, a battery is further provided, comprising a shell, a pole group, and a battery top cover according to 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.

[0078] 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.

[0079] Although the embodiments of the present application have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations shall fall within the scope defined by the appended claims. Industrial Applicability

[0080] The battery top cover provided by the present application comprises a pole assembly composed of a support ring and assembled in the first mounting hole of the cover and the second mounting hole of the lower plastic, thereby eliminating the positive and negative pole riveting blocks, reducing the number of parts, the weight of the entire cover, the cost of parts, and the number of assembly steps. At the same time, since the positive and negative pole riveting blocks are eliminated, the height of the pole is reduced, the space occupied is reduced, and this is beneficial to improving the energy density of the battery.

Claims

1. A battery top cover, characterized in that: It includes 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 comprises: A support ring, wherein the support ring is fixedly disposed in the first mounting hole; A pole, the pole comprising a base, a first end face of the base being provided with a first boss, the diameter of the first boss being smaller than the diameter of the base; the base being arranged in the support ring, the upper surface of the base being flush with the upper surface of the support ring, and the thickness of the pole along the axial direction being greater than the thickness of the support ring.

2. The battery top cover according to claim 1, characterized in that: 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.

3. The battery top cover according to claim 1 or 2, characterized in that: The support ring comprises an annular support ring body, the inner wall of the support ring body is provided with a first convex edge extending in the radial direction, a first groove is formed between the first axial end surface of the first convex edge and the support ring body, and the base is arranged in the first groove.

4. The battery top cover according to claim 3, characterized in that: The pole includes a second boss arranged 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≥0.5mm; 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≥0.5mm.

5. The battery top cover according to claim 4, characterized in that: The first convex edge is arranged in the middle part 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 convex edge, 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, and the sealing ring is arranged in the third groove.

6. The battery top cover according to claim 5, characterized in that: The first mounting hole is a stepped hole, comprising a first hole section and a second hole section, the inner diameter of the first hole section being greater than the inner diameter of the second hole section, and a step surface being formed between the first hole section and the second hole section; the support ring is disposed in the first hole section, the side 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.

7. The battery top cover according to claim 6, characterized in that: 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 arranged 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 along the axial direction, and the extension portion is at least partially arranged between the second hole segment of the first mounting hole and the third boss of the pole.

8. The battery top cover according to claim 5, characterized in that: In 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, the width of the third groove is E, and E>(a+b).

9. The battery top cover according to claim 6, characterized in that: 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, D1 ≥ 0.5mm; 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.

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 9, wherein the battery top cover is arranged on the housing, The pole is electrically connected to the pole group.

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