Battery top cover, assembling method, and power battery

Abstract

A battery top cover, comprising a cover plate (10) provided with a post terminal hole (11) and a post terminal assembly (20) assembled in the post terminal hole (11). The post terminal hole (11) comprises a through hole (112), a bottom wall (114) formed on the circumferential edge of the through hole (112), and a side wall (113) formed by protruding upwards from the circumferential edge of the bottom wall (114). The post terminal assembly (20) comprises a post terminal (21), a seal member (24) attached to the lower side of the post terminal (21), and a lower case (23) and an upper case (22), which enclose the post terminal (21) and the seal member (24) therein. The post terminal (21) comprises a fixing ring (211) and a connecting portion (213) formed by protruding upwards from the middle of the fixing ring (211). The upper case (22) covers the upper surface of the fixing ring (211), and the lower case (23) comprises an annular main body (231) and an internally-protruded ring (235) protruding radially to the inside from the bottom side of the annular main body (231). The edge of the seal member (24) is limited and supported on the internally-protruded ring (235). When the post terminal assembly (20) is mounted into the post terminal hole (11), the side wall (113) is folded inwards so as to form a flange (116) which presses the upper case (22), and the seal member (24) is clamped between the lower surface of the fixing ring (211) and the bottom wall (114). Further provided are an assembling method for the battery top cover, and a power battery which comprises said battery top cover, a battery case and a battery cell packaged in the battery case.

Description

Battery top cover, assembly method and power battery Technical Field

[0001] The present application relates to the field of power batteries, and in particular to a battery top cover, an assembly method, and a power battery. Background Art

[0002] Battery technology is widely used in electric motorcycles, creating huge economic benefits for society, while also being environmentally friendly and reducing emissions. The most important performance characteristics for automotive batteries include safety, energy density, and impact resistance. The power battery includes a number of battery cells, each of which is connected in series and parallel to form a powerful automotive battery pack. Each battery cell includes a battery casing, a battery cell encapsulated in the battery casing, an electrolyte, and a battery top cover that seals the battery casing. Battery cells come in a variety of forms, and the most commonly used ones on the market include cylindrical batteries, square batteries, and blade batteries. Although the battery shapes are diverse, the product component composition principles are consistent, and all include components such as a casing and a top cover.

[0003] Patent application No. 201911418867.8 of the People's Republic of China discloses a power battery top cover structure, which includes a cover plate with a pole hole, a pole, and a rubber coating formed on the periphery of the pole. The pole hole is formed on the cover plate, and the pole hole is formed with a lower step and a vertical wall that is not vertical in the initial state. The pole includes a convex ring, and the rubber coating extends to the periphery of the lower surface of the convex ring. The bottom edge of the convex ring contacts the lower step through the rubber coating, and the rubber coating also covers the upper surface of the convex ring. After the pole is installed in the pole hole, the upper side of the vertical wall is riveted, so that the upper end of the vertical wall is bent inward to form a flange that presses the upper surface of the convex ring, thereby fixing the pole. While the reference document simplifies the product structure, the process for forming the terminal hole in the cover plate is difficult. The overmolding process is in-mold with the terminal, resulting in high injection molding costs. Furthermore, to achieve a seal, the overmolding must be made of a flexible material such as silicone. This means both the upper and lower sides of the terminal are crimped with flexible materials, which can lead to stability issues and high material costs. The overmolding process is integral with the terminal, making it less versatile.

[0004] Summary of the Invention

[0005] In view of this, it is necessary to provide a battery top cover, an assembly method and a power battery with high versatility and simple structure.

[0006] In order to solve the above technical problems, the present application provides a battery top cover, comprising a cover plate provided with a pole hole and a pole assembly assembled in the pole hole, the pole hole comprising a through-hole, a bottom wall formed at the periphery of the through-hole and a side wall protruding upward from the periphery of the bottom wall, the pole assembly comprising a pole, a sealing member attached to the lower side of the pole, and a lower shell and an upper shell wrapping the pole and the seal therein, the pole comprising a fixing ring and a connecting portion protruding upward from the middle of the fixing ring, the upper shell covering the upper surface of the fixing ring, the lower shell comprising an annular main body and an inner convex ring protruding radially inwardly from the bottom side of the annular main body, the edge of the seal being limitedly supported on the inner convex ring, after the pole assembly is installed in the pole hole, the side wall folds inwardly to form a flange pressed on the upper shell, and the seal is clamped between the lower surface of the fixing ring and the bottom wall.

[0007] In order to solve the above technical problems, the present application also provides a power battery, including the aforementioned battery top cover, a battery shell and a battery cell encapsulated in the battery shell, the battery top cover is installed on the battery shell and seals the battery cell in the battery shell, the battery cell is connected to the lower surface of the pole through an adapter plate, and the adapter plate is welded to the bottom surface of the pole through the through hole.

[0008] Compared with traditional technologies, the battery top cover, assembly method and power battery of this application are independent injection-molded components in that the upper shell, lower shell and seal are independent components, which do not require in-mold injection molding, and can reduce manufacturing costs. The upper shell and lower shell are set separately to avoid the problem of high material costs caused by the traditional integrated structure requiring the use of conductive plastic materials. At the same time, the various components of the pole assembly of this application are independent and can be standardized through simple assembly. When developing different product types, the pole assembly can be universalized and the specifications of the cover plate of different types can be redeveloped. Reduce the redundancy of the entire industry, increase the speed of product development, and reduce inventory costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0010] Example 1

[0011] FIG1 is a perspective view of a battery top cover according to an embodiment of the present invention;

[0012] FIG2 is an exploded perspective view of the battery top cover of Example 1;

[0013] FIG3 is a cross-sectional view of the cover plate of the battery top cover according to the first embodiment along the dotted line CC shown in FIG2 ;

[0014] FIG4 is a perspective view of a pole assembly according to the first embodiment;

[0015] FIG5 is a three-dimensional combined view of the pole assembly of the first embodiment from another angle;

[0016] FIG6 is an exploded perspective view of a pole assembly according to the first embodiment;

[0017] FIG7 is a perspective exploded view of the pole assembly of the first embodiment from another angle;

[0018] FIG8 is a cross-sectional view taken along the dotted line DD shown in FIG6;

[0019] FIG9 is a cross-sectional view taken along the dotted line JJ shown in FIG4 ;

[0020] FIG10 is a cross-sectional view taken along the dotted line AA shown in FIG1;

[0021] FIG11 is a cross-sectional view taken along the dotted line BB shown in FIG1 .

[0022] Example 2

[0023] FIG12 is a cross-sectional view of the battery top cover of Example 2.

[0024] Example 3

[0025] FIG13 is an exploded perspective view of the battery top cover of Example 3;

[0026] FIG14 is a cross-sectional view taken along the dotted line XX shown in FIG13;

[0027] Figure 15 is a cross-sectional view of the battery cover of Example 3 in an assembled state;

[0028] Example 4

[0029] FIG16 is an exploded perspective view of the battery top cover of Example 4;

[0030] FIG17 is a cross-sectional view taken along the dotted line YY shown in FIG16;

[0031] FIG18 is a cross-sectional view of the battery top cover of the fourth embodiment in an assembled state.

[0032] Example 5

[0033] FIG19 is a cross-sectional view of the battery top cover of Example 5;

[0034] Example 6

[0035] FIG20 is a cross-sectional view of the battery top cover of Example 6;

[0036] Example 7

[0037] FIG21 is a cross-sectional view of the battery top cover of Example 7;

[0038] Example 8

[0039] FIG22 is a cross-sectional view of the battery top cover of Example 8;

[0040] Embodiment 9

[0041] FIG23 is a schematic diagram showing changes in the metal sheet structure in the roof sheet forming method of Example 5;

[0042] FIG24 is a diagram showing the structural changes of the metal sheet and the coordination of the stamping die in the roof cover sheet forming method according to the fifth embodiment;

[0043] FIG25 is a cross-sectional view taken along the dotted line EE shown in FIG23;

[0044] FIG26 is a cross-sectional view taken along the dotted line FF shown in FIG24.

[0045] Example 10

[0046] FIG27 is a schematic diagram showing changes in the metal plate structure in the roof sheet forming method according to the sixth embodiment;

[0047] FIG28 is a diagram showing the structural changes of the metal sheet and the coordination of the stamping die in the roof cover sheet forming method according to the sixth embodiment;

[0048] FIG29 is a cross-sectional view taken along the dotted line GG shown in FIG27;

[0049] FIG30 is a cross-sectional view taken along the dotted line HH shown in FIG28;

[0050] Explanation of Reference Numerals: Cover plate 10; Pole hole 11; Through hole 112; Side wall 113; Bottom wall 114; Bottom wall intermediate body 114'; Anti-rotation groove 115; Flanged edge 116; Plate body 12; Explosion-proof opening 13; Protruding edge 131; Filling port 14; Pole assembly 20; Pole 21; Fixing ring 211; Step 212; Connecting portion 213; Anti-rotation planes 214, 224; Slot 215; Lower protrusion 216; Riveted protruding ring 217; Upper shell 22; Covering body 221; Isolation protrusion 222; Anti-rotation mating surfaces 223, 233; Snap structure 225; Lower shell 23; Ring body 231; Anti-rotation block 232; Snap structure 234; Inner convex ring 235; Restricting step 236; Seals 24, 25; Clamping ring 241; Restricting convex edge 242; Extended cylinder 243; Gasket 26; Receiving groove 261; Explosion-proof assembly 30; Explosion-proof disk 31; Welding edge 311; Explosion-proof area 312 ; Score-313; Protective cover-32; Insulation plate-40; Insulation plate body-41; Hot melt column-42; Connection hole-43; Annular boss-431; Adapter-50; Rivet holes-51, 53; Connection convex bump-52; Metal plate-S; Claw mark-111; Stamping die-91; Positioning die-911; Stamping punch-912; Punching die-92; Upper fixing sleeve-921; Lower fixing sleeve-922; Punching punch-923; Deburring die-93; Flanging die-94; Upper die sleeve-9 41; flanging punch-942; positioning head-943; round head-944; shaping die-95; flanging die-96; upper die base-961, 971; flanging punch-962; punch extrusion part-964; lower supporting die-963, 973; dividing die-97; dividing punch-972; inner groove-974; pier extrusion die-81; upper die sleeve-811, 821; lower die base-812, 822; pier extrusion punch-813; dividing trough-814; shaping die-82; shaping punch-823. DETAILED DESCRIPTION

[0051] To make the purpose, technical solutions and advantages of this application more clear, the technical solutions of this application will be described clearly and completely below in conjunction with the specific embodiments of this application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of this application, not all of them.

[0052] In this application, the X direction shown in FIG. 1 is the horizontal direction, the Y direction is the longitudinal direction, and the Z direction is the vertical direction.

[0053] Example 1

[0054] 1 to 11 are schematic structural diagrams of the pole assembly and the battery top cover of the first embodiment.

[0055] 1 to 3 , a battery top cover of the first embodiment includes a cover plate 10 having a terminal hole 11 and an explosion-proof opening 13 , a terminal assembly 20 inserted into the terminal hole 11 , an explosion-proof assembly 30 welded to the explosion-proof opening 13 , and an insulating plate 60 fixed to the lower side of the cover plate 10 .

[0056] The cover plate includes a plate body 12 . The pole hole 11 and the explosion-proof opening 13 vertically penetrate the plate body 12 . A liquid injection port 14 is also formed through the plate body 12 .

[0057] The terminal hole 11 includes a through-hole 112 extending vertically through the plate 12, a bottom wall 114 extending from the plate 12 along the through-hole, a sidewall 113 extending upward from the plate 12 along the periphery of the bottom wall 114, and a flange 116 extending from the top of the sidewall 113 above the bottom wall 114. The inner surface of the sidewall 113 is provided with at least one anti-rotation groove 115. The thickness of the bottom wall 114 is no more than half the thickness of the plate 12, and the bottom surface of the bottom wall 114 protrudes downward from the bottom surface of the plate 12. The vertical wall 113 extends upward from the upper surface of the plate 12 and is riveted radially inward at its top to form the flange 116 above the bottom wall 114. The space between the bottom wall 114 and the flange 116 is used to mount and secure the terminal assembly 20. The inner diameter of the through-hole 112 in the bottom wall 114 is smaller than the inner diameter of the through-hole 112 in the flange 116. The thickness of the plate body 12 located on the upper side of the bottom wall 114 serves as a portion of the side wall 113 .

[0058] The surface periphery of the explosion-proof vent 13 protrudes upward to form a ridge 131, and the ridge 131 is a non-planar structure. The explosion-proof assembly 30 includes an explosion-proof disc 31 and a protective cover 32. The explosion-proof disc 31 includes a welded edge 311, an explosion-proof region 312 formed within the welded edge 311, and notches 313 formed on the explosion-proof region 312. The thickness of the explosion-proof region 312 is less than that of the welded edge 311. The notches are formed on the explosion-proof region 312 in a certain pattern so that the explosion-proof region 312 explodes and releases pressure when subjected to a predetermined pressure. The explosion-proof disc 31 is welded to the bottom edge of the explosion-proof vent 13 via the welded edge 311. The protective cover 32 is attached to the ridge 131 of the explosion-proof vent 13. The non-planar structure of the ridge 131 ensures that the explosion-proof vent 13 within the protective cover 32 remains connected to the outside world. The explosion-proof disc 32 can be a protective film.

[0059] The insulating plate 40 includes an insulating plate body 41 covering the lower surface of the plate body 12, a plurality of heat-seal posts 42 protruding upward from the top of the insulating plate body 41, and connection holes 43 extending through the corresponding terminal holes 11. The edges of the connection holes 43 protrude upward to form an annular boss 431. Several blind holes (not shown) are formed on the lower surface of the plate body 12 corresponding to the heat-seal posts 42. The insulating plate 40 is fixed by heat-seal by inserting the heat-seal posts 42 into these blind holes.

[0060] Please continue to refer to FIG. 4 to FIG. 9 , and the structural principle of the pole assembly 20 of the first embodiment will be described in detail below.

[0061] The pole assembly 20 of the first embodiment includes a lower shell 23, an upper shell 22, a pole 21 and a seal 24 clamped between the lower shell 23 and the upper shell. The seal 24 is attached to the lower surface of the pole 21.

[0062] The pole 21 includes a fixing ring 211, a stepped portion 212 protruding upward from the center of the fixing ring 211, and a connecting portion 213 protruding upward from the stepped portion 212. The pole 21 has a segmented cylindrical structure. The outer diameter of the fixing ring 211 is larger than that of the stepped portion 212, which in turn is larger than that of the connecting portion 213. The bottom center of the fixing ring 211 protrudes downward and is surrounded by a retaining groove 215.

[0063] Figure 10 shows a cross-sectional view of a positive electrode column assembly, and Figure 11 shows a cross-sectional view of a negative electrode column assembly. The positive electrode column 21 is made of aluminum, while the negative electrode column 21 is made of a copper-aluminum composite material. That is, the bottom layer of the negative electrode column 21 is made of the same material, and the upper layer is made of aluminum, and they are fixed together by pressing or other methods. In one embodiment, if the electrode column 21 is a negative electrode column, the fixing ring 211 includes a copper layer and an aluminum layer.

[0064] The seal 24 includes a clamping ring 241 attached to the outer edge of the lower surface of the fixing ring 211, an extension cylinder 243 extending downward from the inner edge of the clamping ring 241, and a limiting flange 242 protruding upward from the outer edge of the clamping ring 241. The seal 24 is preferably made of fluororubber to improve heat and corrosion resistance.

[0065] The lower housing 23 comprises an annular body 231, an inner convex ring 235 extending from the bottom of the annular body 231 toward the center, and at least one anti-rotation block 232 extending from the outer periphery of the annular body 231. The inner wall of the annular body 231 is provided with at least one anti-rotation flat surface 233. The inner wall of the annular body 231 is a circular arc surface, and the anti-rotation flat surface 233 protrudes from the arc surface to form a flat structure. A snap-fit ​​structure 234 is provided above the anti-rotation flat surface 233. The snap-fit ​​structure 234 is formed in the form of a slot or a block. A stop step 236 is provided on the inner wall of the annular body 231, above the inner convex ring 235. The end of the fixing ring 211 of the pole 21 is positioned on the stop step 236 to distinguish the position of the seal 24 from the pole 21. This prevents excessive compression of the seal 24 during riveting and extrusion of the pole assembly 20, protecting the seal 24.

[0066] The upper shell 22 includes a covering body 221 covering the upper surface of the fixing ring 211 of the pole 21, and an isolation protrusion 222 protruding upward from the inner edge of the covering body 221. The upper surface of the isolation protrusion 222 is not lower than the surface of the step portion 212 of the pole 21, and it is preferred that the two are flush. The inner wall surface of the upper shell 22 is provided with an anti-rotation mating surface 223. An anti-rotation plane 224 is provided on the outer edge of the covering body 221 corresponding to the anti-rotation mating surface 233 of the lower shell 23. The anti-rotation mating surface 233 of the covering body 221 cooperates with the anti-rotation plane 224 to prevent rotation between the two. A snap-fit ​​structure 225 is also provided on the anti-rotation mating surface 223 of the covering body 221. The snap-fit ​​structure is a hook or a slot. The snap-fit ​​structure 225 is snap-fitted with the snap-fitting structure 234 of the lower shell 23 to achieve pre-fixation of the two.

[0067] In one embodiment, the upper shell 22 further includes an extended covering portion (uncovered) that protrudes inwardly from the isolation protrusion 222 and covers the step portion 212 .

[0068] The pole assembly 20 of the first embodiment can be preassembled into a whole and then installed into the pole hole 11 of the cover plate 10 .

[0069] Specifically, the seal 24 is first installed into the lower housing 23 from above, with the edge of the retaining ring 241 of the seal 24 restrained on the inner convex ring 235. The pole 21 is then installed into the lower housing 23 from above, with the lower surface of the retaining ring 211 of the pole 21 abutting against the upper surface of the retaining ring 241 of the seal 24. The retaining groove 215 radially outwardly restrains the retaining convex edge 242 of the seal 24, preventing the seal 24 from deforming and sliding inward. Alternatively, the seal 24 can be first abutted against the lower surface of the pole 21 before being installed together into the lower housing 23 to prevent displacement and deformation of the seal 24.

[0070] Finally, the upper shell 22 is pressed into the lower shell 23 from above. At this time, the covering body 221 covers the upper surface of the fixing ring 211, and the snap structure 225 of the upper shell 22 is pre-fixed with the snap fitting structure 235 of the lower shell 23.

[0071] After the pole assembly 20 is assembled, the anti-rotation flat surface 214 on the fixing ring 211 of the pole 21 cooperates with the anti-rotation mating surface 223 in the lower shell 23 to prevent the pole 21 from rotating within the lower shell 23. The anti-rotation flat surface 214 outside the step 212 of the pole 21 cooperates with the anti-rotation mating surface 223 in the upper shell 22 to prevent rotation between the upper shell 22 and the pole 21. The anti-rotation flat surface 224 outside the covering body 221 of the upper shell 22 cooperates with the anti-rotation mating surface 233 in the lower shell 23 to prevent rotation between the lower shell 23 and the upper shell 22.

[0072] The upper shell 22 is made of a conductive plastic material, such as conductive PPS, while the lower shell 23 is made of an insulating plastic. The conductive plastic material of the upper shell 22 has a resistance between 1 and 10,000 ohms. By using a conductive plastic material, the upper shell 22 can effectively reduce the potential difference between the cover plate 10 and the pole 21, preventing electrical corrosion of the cover plate 10 and the pole, thereby increasing the service life of the pole 21 and the cover plate 10. However, the price of conductive plastic material is two to three times that of insulating plastic material. This embodiment divides the housing into an upper shell 22 and a lower shell 23. The upper shell 22 serves as a covering material, significantly reducing its volume and material requirements, while the lower shell 23 serves as a container, requiring a relatively larger volume and material requirements. Compared to conventional solutions that use both conductive plastic materials, this significantly reduces material costs. The upper shell 22 and lower shell 23 can save 60%-70% of the cost of conductive plastic materials, effectively enhancing the product's market competitiveness.

[0073] At the same time, compared to traditional poles, the lower side of the pole 21 of this embodiment 1 does not need to protrude downward, which greatly reduces the thickness of the pole 21. The material cost of the pole 21 can be reduced by 55%-70%. The pole 21 has a simple structure and can be manufactured using a stamping process, eliminating the need for expensive CNC machining technology, which can further reduce manufacturing costs. At the same time, space utilization is improved, which can increase the product energy density per unit volume. The upper shell 22, lower shell 23, and seal 24 of this embodiment 1 are all independently injection molded, that is, the pole assembly 20 does not require an in-mold injection molding process, which can reduce manufacturing costs.

[0074] Most importantly, the pole assembly 20 of the first embodiment is independent and requires simple assembly. This allows for standardization. When developing different product types, the pole assembly can be universalized, and different specifications of the cover plate 10 can be newly developed. This reduces redundancy across the industry, speeds up product development, and reduces inventory costs.

[0075] Example 2

[0076] Please continue to refer to FIG. 12 . As an alternative structure of the first embodiment, the second embodiment differs in that the lower shell 23 is eliminated and a sealing member 25 is used to integrate the functions of the original sealing member 24 and the lower shell 23 .

[0077] Specifically, the structures of the pole 21 and upper shell 22 remain unchanged. The seal 25 includes a covering body 211 that covers the lower surface of the fixing ring 211 of the pole 21, an extending cylindrical portion 243 that extends downward from the inner edge of the covering body 241, and an annular body 231 that extends upward from the outer edge of the covering body 211 and covers the outer edge of the fixing ring 211. The top of the annular body 231 extends beyond the upper surface of the fixing ring 211 but does not exceed the upper surface of the step 212.

[0078] During assembly, the seal 25 wraps upwardly around the pole 21, and the thickness of the annular body 231 is greater than the distance between the retaining ring 211 of the pole 21 and the sidewall 113 of the pole hole 11, thereby achieving an interference fit seal after installation. The inner edge of the annular body 231 can also extend toward the center of the circle to form an extended edge that covers a portion of the surface of the cover body 221 of the upper shell 22. During assembly, the upper shell 22 is first inserted into the outer surface of the pole 21, and then the seal 25 is wrapped from bottom to top around the outer surface of the pole 21 and partially wrapped around the surface of the upper shell 22 to achieve pre-fixation.

[0079] The slot 215 on the lower surface of the pole 21 and the limiting ridge 242 on the edge of the main body 241 of the seal 25 can be retained to prevent the seal 25 from collapsing or shifting during the extrusion process. The upper shell 22 is made of the same conductive plastic as in the first embodiment.

[0080] Compared with the first embodiment, the second embodiment reduces one lower shell 23 component and has a simpler structure. However, the outer periphery of the fixing ring 211 of the pole 21 lacks hard material support, which may cause a risk of slight movement.

[0081] Example 3

[0082] Please continue with Figures 13 to 15, which are drawings of the three-pole assembly 20 and the battery top cover of the embodiment of the present application. The structural principle of the third embodiment of the present application will be introduced in detail below.

[0083] Embodiment 3 is an alternative to Embodiment 1. The difference lies in that some functional structures of the lower shell 23 are integrated into the upper shell 22, so that the upper shell 22 and the lower shell 23 form a single unit. Because this component is inserted from above the pole 21, it is still referred to as the upper shell 22 in this embodiment.

[0084] Specifically, the upper shell 22 of the pole assembly 20 of this embodiment includes a covering body 221 that covers the upper surface of the fixing ring 211 of the pole 21, an isolation protrusion 222 that extends upward from the inner edge of the covering body 221, and an annular body 231 that extends downward from the outer edge of the covering body 221 and wraps around the outer surface of the fixing ring 211. The downward extension length of the annular body 231 exceeds the lower surface of the fixing ring 211. The edge of the clamping ring 241 of the seal 24 is located on the inner side of the annular body 231.

[0085] In one implementation of this embodiment, the slot 215 at the bottom of the pole 21 and the limiting convex edge 242 of the seal 24 can still be retained to limit the position of the seal 24 to prevent it from collapsing inward after being squeezed.

[0086] Compared to the first embodiment, this embodiment eliminates the lower shell 23 and integrates some of its functions into the upper shell 22, simplifying the structure. During assembly, the pole 21 is first pressed into the upper shell 22 with an interference fit, and then the seal 24 is installed within the annular body 231 of the upper shell 22 and fits against the bottom surface of the fixing ring 211 of the pole 21. However, a disadvantage is that it increases the use of conductive plastic material, raising product material costs. Similarly, this embodiment can also be promoted as an industry standard, allowing for universal use of all components.

[0087] In this embodiment, the annular body 231, the cover body 221, and the inner wall surfaces of the isolation protrusion 222 of the upper shell 22 still retain anti-rotation mating surfaces 223, 233 to cooperate with the anti-rotation flat surface 214 on the pole 21 to prevent rotation between the upper shell 22 and the pole 21. The annular body 231 retains an anti-rotation block 232 to cooperate with the anti-rotation groove 115 in the pole hole 11 to prevent the pole assembly 20 from rotating within the pole hole 11.

[0088] Example 4

[0089] Please continue to refer to Figures 16 to 18, which are drawings of the fourth pole assembly 20 and the battery top cover of the embodiment of the present application. The structural principle of the fourth embodiment of the present application will be described in detail below.

[0090] The fourth embodiment improves upon the technical solution of the third embodiment, differing in that a gasket 26 is added. The outer edge of the gasket 26 is recessed to form a receiving groove 261. The bottom of the annular body 231 of the upper shell 22 is received within the receiving groove 261. The downward extension of the annular body 231 is correspondingly shortened, and the bottom edge of the fixing ring 211 of the pole 21 is pressed against the upper surface of the gasket 26.

[0091] When the gasket 26 rivets the flange 116 of the pole hole 11 and presses the upper shell 22 downward, it can prevent the annular body 231 of the upper shell 22 from collapsing and squeezing the seal 24 inward, thereby preventing the seal 24 from shifting.

[0092] With particular reference to Figures 10 and 11, the pole assembly 20 described in Examples 1 to 4 is ultimately installed in the pole hole 11 of the cover plate 10, with the seal 24 clamped between the pole 21 fixing ring 211 and the bottom wall 114 of the pole hole 11. The extension tube 243 extends downwardly on the inner wall surface of the through-hole 112 at the bottom wall 114, and abuts downwardly against the annular boss 431 of the connection hole 43 of the insulating plate body 40. The annular boss 431 provides a certain degree of support for the seal 24, preventing the seal 24 from being squeezed, deformed, and extending downward. In one embodiment, the limiting boss 431 can be designed to be inclined toward the center of the circle, so that the extension tube 243 of the seal 24 is located between the limiting boss 431 and the inner wall surface of the through-hole 112.

[0093] Subsequently, the top of the sidewall 113 of the pole hole 11 is riveted toward the center of the circle to form a flange 116 that presses downward against the covering body 221 of the upper shell 22. This compresses and seals the clamping body 241 of the seal 24 between the retaining ring 211 and the bottom wall 114. In vertical projection, the outer edge of the retaining ring 211 at least partially overlaps the flange 116. The flange 116 and the isolation protrusion 222 are flush with the surface of the step 212.

[0094] After the pole assembly 20 of the first and second embodiments is inserted into the pole hole 11 and riveted, the limiting convex edge 242 of the seal 24 is limited radially outward by the groove 215 at the bottom of the fixing ring 211 to prevent the seal 24 from collapsing toward the center of the circle.

[0095] It should be noted that the pole assembly 20 of Examples 1 to 4 can also be applied to a cover plate 10 using a welding ring, such as the patent application number 202110666517.4 previously filed by the applicant, which can also be used in the same. This can greatly increase the versatility of the pole assembly 20 of the present application and make it a universal standard.

[0096] The battery cover of this application is used for a power battery, which also includes a battery housing, a battery cell encapsulated in the battery housing, a battery cover that seals the battery cell in the battery housing, and an adapter that connects the terminal 21 to the battery cell. Specifically, the adapter is welded to the lower surface of the middle portion of the fixing ring 211 of the terminal 21 through the connection hole 43 of the insulating plate 40 below the battery cover.

[0097] The pole assemblies 20 in the embodiments of the present application are all cylindrical in structure. In other embodiments, square poles are still within the protection scope of the present application.

[0098] Example 5

[0099] As shown in FIG. 19 , the top cover of the fifth secondary battery in this embodiment further includes a connecting piece 50 electrically connected to the terminal 21 , compared to the first embodiment.

[0100] The pole 21 of this embodiment also includes a lower protrusion 216 that protrudes downward from the bottom surface of the fixing ring 211. The bottom surface of the lower protrusion 216 extends downward until it is flush with the lower surface of the insulating plate 40. When the pole 21 is used as a negative pole, the pole 21 includes an aluminum layer 2101 and a copper layer 2102 located below and integral with the aluminum layer 2101. The copper layer 2102 can be a portion of the lower protrusion 216, or the entire lower protrusion 216 and a portion of the lower layer of the fixing ring 211 can be the copper layer 2102. There is a gap between the outer periphery of the lower protrusion 216 and the seal 24, and they are not in contact. There is no contact between the connection hole 43 of the insulating plate 40 and the lower protrusion 216.

[0101] The adapter plate 50 is attached to the lower surface of the insulating plate 40 and welded to the bottom surface of the lower protrusion 216 of the pole 21. The lower surface of the adapter plate 50 is electrically connected to the battery cell, that is, the battery cell is electrically connected to the pole 21 through the adapter plate 50.

[0102] Example 6

[0103] As shown in Figure 20 , this embodiment differs from the fifth embodiment in that the adapter plate 50 has a rivet hole 51 at the location corresponding to the lower protrusion 216 of the pole 21. The lower protrusion 216 extends downward to form a riveted protrusion 217 that extends beyond the lower surface of the insulating plate 40. The rivet hole 51 of the adapter plate 50 is riveted into the outer periphery of the riveted protrusion 217, and then laser spot welding is performed around the joint between the two. This provides a more effective fixation of the adapter plate 50.

[0104] Example 7

[0105] 21 , in this embodiment, the adapter plate 50 is punched upward at the position corresponding to the pole 21 to form a connecting bump 52 that passes through the connecting hole 43 of the insulating plate 40 and the pole hole 11. The connecting bump 52 contacts the lower surface of the fixing ring 211 of the pole 21 and is welded together.

[0106] Example 8

[0107] As shown in Figure 22, compared to the seventh embodiment, the eighth embodiment has a rivet hole 53 formed on the connection protrusion 51 of the adapter plate 50. The bottom surface of the fixing ring 211 of the pole 21 is formed with a rivet protrusion 217 that is riveted into the rivet hole 53. After the rivet protrusion 217 is riveted into the rivet protrusion 217, laser welding is used to weld the rivet protrusion 217 and the rivet hole 53 together at the junction, ensuring a tight and conductive connection between the two. The downward extension depth of the rivet protrusion 217 does not exceed the lower surface of the pole hole 11.

[0108] Examples 5 through 8 provide various methods for connecting the adapter plate 50 to the pole 21. Examples 5 and 6 extend the lower surface of the pole 21 to be flush with the bottom surface of the insulating plate 40, facilitating direct welding of the flat adapter plate 50 thereto. Examples 7 and 8 achieve connection by stamping the adapter plate 50 upward to form a connecting bump 52, which reduces the material used for the pole 21 and reduces manufacturing costs.

[0109] Embodiment 9

[0110] Please continue to refer to FIG. 23 to FIG. 26 , in which the ninth embodiment mainly introduces the forming process of the pole hole 11 of the cover plate 10 .

[0111] In this embodiment, the Y direction shown in FIG. 23 is the longitudinal direction, the X direction is the transverse direction, and the Z direction is the upper vertical direction.

[0112] The cover plate forming method of this embodiment mainly includes the following steps:

[0113] S101, providing a metal plate S, and punching out circular claw marks 111 at predetermined positions on the metal plate S;

[0114] This step is optional. In different embodiments, the claw mark in this step may not be punched. The claw mark 111 serves to increase the bonding strength with the molded plastic in some in-mold injection molding solutions.

[0115] The claw marks 111 are stamped on both sides of the metal plate S in the transverse direction, corresponding to the positive and negative poles of the terminal hole 11. In some embodiments, such as blade batteries, only one annular claw mark 11 needs to be formed in the transverse direction of the metal plate S.

[0116] This step is achieved using a stamping die 91, which includes a cylindrical positioning die 911 that is pressed against the surface of the metal sheet S, and a stamping punch 912 that strikes the metal sheet S downward from a plurality of holes formed in the positioning die 911 to form the claw marks. Specifically, the positioning die 911 is provided with a plurality of annular holes around its periphery, and the stamping punch 912 punches downward from these holes to form the claw marks.

[0117] S102, punching a hole 112 in the middle of the claw mark 111 of the metal plate S;

[0118] In this step, a punching die 92 is used to punch a through-hole 112 in the middle of the annular claw mark 111 . The through-hole 112 and the annular claw mark 111 are co-centered, and there is a certain distance between the edge of the through-hole 112 and the claw mark 111 .

[0119] The punching die 92 includes a lower fixing sleeve 922 that is hollow and supported on the lower surface of the metal sheet S, an upper fixing sleeve 921 that corresponds to the lower fixing sleeve 922 and is hollow and pressed against the upper surface of the metal sheet S, and a punch 923 that is sleeved within the upper fixing sleeve 921. The punch 923 punches downward to remove a portion of the metal sheet S at a predetermined position and form the perforation 112.

[0120] S103, performing a deburring operation on the punched holes;

[0121] This step is mainly to remove the burrs formed during the punching process of step S102. This step is optional and can be omitted depending on product quality, stamping process improvement, etc. In this step, a deburring die 93 is used to remove burrs and other substances to avoid subsequent short circuits.

[0122] S104, flanging the metal plate S around the perforation 112 upward to form an upwardly extending side wall 113;

[0123] The amount of flanging in this step is determined by the product size specifications. The flanging operation in this step is performed using a flanging die 94. Specifically, the flanging die 94 includes a hollow upper die sleeve 941, a positioning head 943 mounted within the upper die sleeve 941, and a flanging punch 942 that bends the periphery of the perforation 112 upward from the bottom side of the metal sheet S. Initially, the bottom center of the positioning head 943 protrudes downward to form a head 945 that extends into the perforation 112. The head 945 helps protect the edge of the perforation 112. The top edge of the flanging punch 942 is a circular arc structure to prevent damage to the metal sheet S during upward flanging.

[0124] During the flanging operation, the head 945 of the positioning head 943 is inserted downward into the perforation 112 to protect the edge of the perforation 112, and the flanging punch 942 presses the metal sheet S upward. The flanging punch 942 and the perforation 112 are cocentric. There is a gap between the outer surface of the flanging punch 942 and the inner wall surface of the upper die sleeve 941 to accommodate the upwardly bent side wall 113. When the flanging punch 942 moves upward, it first contacts the head 945 of the positioning head 943 and pushes the positioning head 943 upward. Then, it begins to press the metal sheet S upward until the metal sheet S around the periphery of the perforation 112 is pressed upward to form the side wall 113. At this time, the side wall 113 preferably has a certain inclination angle. Specifically, the side wall 113 is inclined at a small angle toward the center of the circle.

[0125] S105, shaping the side wall 113 around the through hole 112;

[0126] This step primarily reshapes the side walls 113 into a vertical position. This is primarily accomplished using a shaping die 95, which uses a positioning sleeve (not numbered) surrounding the side walls 113 to limit the outer position of the side walls 113. A shaping head (not numbered) is then inserted between the side walls 113 to press the side walls 113 outwards, forcing them into a 90-degree vertical position.

[0127] S106, shaping and edge-shaving the side wall 113 so that the side wall 113 reaches a predetermined shape;

[0128] This step mainly involves shaping the flatness of the top surface of the side wall 113 and the thickness at each location, so that the side wall 113 reaches a predetermined shape and structure. Specifically, the process of this step is carried out using a trimming die 96, which includes a hollow upper die base 961, a trimming punch 962 inserted into the upper die base 961, and a lower support die 963. The middle portion of the bottom surface of the trimming punch 962 protrudes downward to form a punch extrusion portion 964. A gap is formed between the outer periphery of the punch extrusion portion 964 and the inner wall surface of the upper die base 961 to accommodate the side wall 113. The height of the gap is the predetermined height of the side wall 113.

[0129] During the edge beating, the edge beating punch 962 is used to press downwards, so that the metal on the side wall 113 flows and is made uniform, and the height at each position is kept consistent.

[0130] S107, dividing the side wall 113 to form a horizontal bottom wall 114;

[0131] In this step, a portion of the inner wall thickness of the side wall 113 is extruded downward to form the horizontal bottom wall 114. After this step, the thickness of the side wall 113 is reduced by more than half, that is, more than half of the material on the inner side of the side wall 113 is extruded to form the bottom wall 114. At the same time, the thickness of the bottom wall 114 is greater than that of the side wall 113.

[0132] This step utilizes a splitter die 97, which comprises a hollow upper die base 971, a lower die base 973, and a splitter punch 972 inserted into the upper die base 971. The center portion of the top surface of the lower die base 973 is recessed downward by a certain distance. This recess is located outside the splitter position of the side wall 113, but does not extend beyond the outer surface of the side wall 113. This causes the bottom wall 114 to protrude downward a certain distance, forming a protruding surface T. An inner groove 974 is formed on the lower outer edge of the splitter punch 972. The distance between this inner groove 974 and the inner surface of the upper die base 971 is the thickness of the side wall 113 after the splitter is formed.

[0133] In another embodiment, the material dividing die 97 of the present application is improved to form a complete perforation 112 while dividing the material. At this time, according to the inner diameter of the perforation 112, mutually matching holes and boss structures are respectively set on the bottom surface of the lower die base 973 and the material dividing punch 972, so that the metal material squeezed downward is limited to the periphery of the boss. The boss is set to an inclined surface so that it can be easily inserted into the hole. Preferably, the boss is set on the bottom surface of the material dividing punch 972, and the hole is set in the lower die base 972. Of course, the positions of the boss and the hole can be interchanged. At this time, by controlling the thickness of the material dividing, a complete bottom wall 114 and perforation 112 can be formed by stamping in one time.

[0134] S108, cutting the metal plate S into a plurality of cover plate units in a transverse direction;

[0135] This step involves cutting the plurality of continuously stamped pole holes 11 from the metal sheet S into a plurality of independent cover plate 10 units. In this embodiment, each cover plate 10 unit includes two pole holes 11 distributed longitudinally. Specifically, the metal sheet S is cut into the plurality of cover plate 10 units along the dashed line C shown in FIG23 .

[0136] In the ninth embodiment, the pole hole 11 of the cover plate 10 is formed by stamping, and the side wall 113 is then riveted and bent to fix the pole assembly 20. This avoids the need to use a separately formed welding ring to weld and fix the pole assembly 20 in the prior art, greatly reducing costs, and has a simple structure and easy assembly.

[0137] Example 10

[0138] Please continue to refer to FIG. 27 to FIG. 30 . The tenth embodiment mainly introduces another molding process of the pole hole 11 of the cover plate 10 .

[0139] The cover plate forming method of this embodiment mainly includes the following steps:

[0140] S201, providing a metal sheet S, and extruding a predetermined area of ​​the metal sheet S to thin the area and force excess metal to flow upward to form a side wall 113, while also forming a thinned bottom wall 114;

[0141] In this step, the operation is achieved through an irritation die 81 . Specifically, the irritation die 81 includes a lower die base 812 with a flat surface, a hollow upper die sleeve 811 , and an irritation punch 813 inserted into the upper die sleeve 811 .

[0142] The lower die base 812 is supported on the bottom surface of the metal sheet S at a corresponding position. The upper die sleeve 811 is hollow and pressed against the upper surface of the metal sheet S at a corresponding position. The lower side of the hollow cavity of the upper die sleeve 811 is recessed radially outward to form a material distribution groove 814. The height of the material distribution groove 814 is greater than the required height of the side wall 113. The center of the ram punch 813 protrudes downward, and the outer diameter of the protruding portion is no greater than the inner diameter of the through hole 112.

[0143] In this step, the thickness of the side wall 113 in the vertical direction does not necessarily have to be uniform, and can be designed to be thicker at the bottom and thinner at the top.

[0144] In another embodiment, the material dividing groove 814 can also be arranged on the outer periphery of the lower side of the extrusion punch 813, while the hollow inner wall surface of the upper die base 811 remains flat; or the material dividing groove 814 is formed by combining the upper die base 811 and the extrusion punch 813.

[0145] During the extrusion process of this step, the middle protruding part of the extrusion punch 813 first presses the predetermined position of the metal plate S downward, causing the metal at this position to flow radially outward and become thinner, and continues to extrude downward. The lower surface of the extrusion punch 813 completely extrudes the metal plate S at the corresponding position. At this time, the metal at this position flows radially outward and finally grows along the distribution groove 814 to form the side wall 113 and the bottom wall 114 at the same time. The middle of the bottom wall 114 corresponding to the protruding part of the extrusion punch 813 forms a bottom wall intermediate 114' that is thinner than the bottom wall 114.

[0146] S202, shaping the bottom wall 114 and the side wall 113;

[0147] In this step, the irregular positions of the bottom wall 114 and the side wall 113 are shaped to achieve a predetermined thickness and shape.

[0148] This step is performed by the shaping die 82, which includes a lower die base 822, an upper die sleeve 822, and a shaping punch 823 inserted into the upper die sleeve 823. Similar to the piercing die 81, the upper die sleeve 822 and the shaping punch 823 are formed with a shaping groove 824 at the position corresponding to the side wall 113. The shaping groove 824 is formed by the outer surface of the hollow cavity of the upper die sleeve 821 being concave outward and the outer surface of the shaping punch 823 being concave inward. This design can avoid the side wall 113 from being divided again when the shaping punch 823 is pressed downward to shape the side wall 113. The side wall 113 being thicker at the bottom and thinner at the top in step S201 is also to reduce this risk. The middle part of the bottom surface of the shaping punch 823 also protrudes downward to form a protruding part to further make the thickness of the bottom wall 114 reach the predetermined thickness and ensure the flatness of the bottom wall 114. The height of the shaping groove 824 is consistent with the predetermined height of the side wall 113. After this step, the surface of the side wall 113 will be shaped and leveled and the thickness of the side wall 113 will be kept consistent.

[0149] A recessed space is formed in the middle of the lower mold base 822 corresponding to the side wall 113 , so that the bottom wall 114 slightly bulges downward to form a convex surface T.

[0150] S203, cutting off the middle portion of the bottom wall 114 to form a through hole 112;

[0151] This step can be achieved by a simple stamping die, and the corresponding die structure is not shown in the figure. Specifically, the bottom wall intermediate body 114 ′ is cut to form the through hole 112 .

[0152] S204, cutting the metal plate S into a plurality of cover plate units in a transverse direction;

[0153] This step is to cut the several pole holes 11 continuously punched from the metal sheet S into several independent cover plate 10 units. In this embodiment, each cover plate 10 unit includes two pole holes 11 distributed in the longitudinal direction. That is, the metal sheet S is cut into multiple cover plate 10 units along the dotted line C shown in Figure 27. The cutting equipment is relatively simple and is not shown in the figure. The cutting step can be set up in a continuous stamping equipment together with the aforementioned operation process. Through continuous operation, each stamping process can be completed in one stamping action, which can effectively improve the stamping efficiency.

[0154] In the tenth embodiment, the pole hole 11 of the cover plate 10 is formed by stamping, and the side wall 113 is then fixed to the pole assembly 20 by integrally riveting and bending. This avoids the need to weld and fix the pole assembly 20 using a separately formed welding ring as in the prior art, significantly reducing costs, and providing a simple structure and assembly. Compared to the forming method of the ninth embodiment, this embodiment has simpler steps and a more concise stamping equipment, effectively improving efficiency and reducing costs.

[0155] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0156] The above embodiments merely represent preferred embodiments of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A battery top cover, characterized in that: The invention comprises a cover plate provided with a pole hole and a pole assembly assembled in the pole hole, the pole hole comprising a through hole, a bottom wall formed at the periphery of the through hole and a side wall protruding upward from the periphery of the bottom wall, the pole assembly comprising a pole, a sealing member attached to the lower side of the pole, and a lower shell and an upper shell wrapping the pole and the sealing member therein, the pole comprising a fixing ring and a connecting portion protruding upward from the middle of the fixing ring, the upper shell covers the upper surface of the fixing ring, the lower shell comprises an annular main body and an inner convex ring protruding radially inward from the bottom side of the annular main body, the edge of the seal is limitedly supported on the inner convex ring, after the pole assembly is installed in the pole hole, the side wall is folded inward to form a flange pressed on the upper shell, and the seal is clamped between the lower surface of the fixing ring and the bottom wall.

2. The battery top cover according to claim 1, characterized in that: The upper shell is made of conductive plastic material, and the lower shell is made of insulating plastic. The resistance of the conductive plastic is between 1-10000 ohms.

3. The battery top cover according to claim 2, characterized in that: The pole also includes a step portion located between the connecting portion and the fixing ring, the outer diameter of the step portion is larger than the outer diameter of the connecting portion and smaller than the outer diameter of the fixing ring, the upper shell includes a covering body covering the upper surface of the fixing ring and an isolation protrusion extending upward from the inner edge of the covering body to cover the radial outer side surface of the step portion, the upper surface of the isolation protrusion is flush with the upper surface of the step portion, and the flange is pressed on the upper side of the covering body and the upper surface does not exceed the isolation protrusion.

4. The battery top cover according to claim 3, characterized in that: The isolation protrusion of the upper shell separates the pole and the cover plate, and the isolation protrusion is exposed to the outside world. The conductive property of the upper shell helps to reduce the potential difference between the pole and the cover plate, reduce the risk of electrical corrosion of the two, and improve the service life.

5. The battery top cover according to claim 3, characterized in that: A buckle structure is provided on the edge of the covering body of the upper shell, and a buckle matching structure that locks with the buckle structure is provided at a corresponding position on the inner wall surface of the annular body of the lower shell.

6. The battery top cover as claimed in claim 3, characterized in that: The sealing component includes a clamping ring body clamped between the bottom surface of the fixing ring and the bottom wall, a limiting convex edge protruding upward from the outer edge of the clamping ring body, and an extending cylinder portion extending downward from the outer edge of the clamping ring body, wherein the extending cylinder portion extends to the inner wall surface of the through hole, and the outer edge of the bottom surface of the fixing ring of the pole is recessed upward to form a groove, the limiting convex edge is received in the groove and the lower side of the limiting convex edge is supported by the inner convex ring, thereby limiting the limiting convex edge in the up and down directions and the radial direction.

7. The battery top cover according to claim 6, characterized in that: The fixing ring of the pole and the radial outer surface of the step portion are provided with an anti-rotation plane, the inner wall surface of the lower shell and the inner wall surface of the upper shell are provided with an anti-rotation mating surface matching the anti-rotation plane to prevent rotation between them, the outer side surface of the covering body of the upper shell is provided with an anti-rotation plane matching the anti-rotation mating surface of the lower shell, the snap-fit ​​structure is provided on the anti-rotation plane of the lower shell, and the snap-fitting structure of the lower shell is provided on the upper side of the anti-rotation mating surface.

8. The battery top cover according to claim 1, characterized in that: An anti-rotation groove is provided on the side wall of the pole hole, and an anti-rotation block is formed on the outer side of the lower shell protruding outwards. The anti-rotation block is inserted into the anti-rotation groove to be placed and rotated.

9. The battery top cover according to claim 1, characterized in that: The upper surface of the bottom wall is lower than the surface of the cover plate, the side wall is formed by extruding the material on the upper side of the bottom wall, the flange is formed by bending the upper part of the side wall through a rotary riveting process after the pole assembly is installed, and a predetermined pressing force is applied to the pole assembly during rotary riveting to extrude the seal and achieve sealing.

10. The battery top cover according to claim 1, characterized in that: The pole also includes a riveted protruding ring protruding downward from the lower side of the fixing ring and an adapter plate riveted and fixedly connected to the riveted protruding ring; or, the pole also includes a lower protruding portion protruding downward from the fixing ring and an adapter plate fixed to the lower protruding portion by spot welding.

11. A battery top cover, characterized in that: It includes a cover plate provided with a pole hole and a pole assembly assembled in the pole hole, the pole hole includes a through hole, a bottom wall formed at the periphery of the through hole and a side wall protruding upward from the periphery of the bottom wall, the pole assembly includes a pole, a lower shell and an upper shell that wrap the pole inside, and a seal located at the lower side of the pole, the pole includes a fixing ring and a connecting portion protruding upward from the middle of the fixing ring, the upper shell covers the upper surface of the fixing ring, the lower shell includes an annular body that accommodates the fixing ring inside and a limiting step protruding from the inner wall surface of the annular body to limit the fixing ring, the seal is clamped between the lower surface of the fixing ring and the bottom wall, the side wall is folded inward to form a flange pressed on the upper shell, and the seal is clamped between the lower surface of the fixing ring and the bottom wall.

12. The battery top cover according to claim 11, characterized in that: The upper shell is made of conductive plastic material, and the lower shell is made of insulating plastic. The resistance of the conductive plastic is between 1-10000 ohms.

13. The battery top cover according to claim 12, characterized in that: The pole also includes a step portion located between the connecting portion and the fixing ring, the outer diameter of the step portion is larger than the outer diameter of the connecting portion and smaller than the outer diameter of the fixing ring, the upper shell includes a covering body covering the upper surface of the fixing ring and an isolation protrusion extending upward from the inner edge of the covering body to cover the radial outer side surface of the step portion, the upper surface of the isolation protrusion is flush with the upper surface of the step portion, and the flange is pressed on the upper side of the covering body and the upper surface does not exceed the isolation protrusion.

14. The battery top cover according to claim 13, characterized in that: The isolation protrusion of the upper shell separates the pole and the cover plate, and the isolation protrusion is exposed to the outside world. The conductive property of the upper shell helps to reduce the potential difference between the pole and the cover plate, reduce the risk of electrical corrosion of the two, and improve the service life.

15. The battery top cover according to claim 13, characterized in that: A buckle structure is provided on the edge of the covering body of the upper shell, and a buckle matching structure that locks with the buckle structure is provided at a corresponding position on the inner wall surface of the annular body of the lower shell.

16. The battery top cover according to claim 13, characterized in that: The sealing member comprises a clamping ring body clamped between the bottom surface of the fixing ring and the bottom wall and an extending tube portion extending downward from the inner edge of the clamping ring body, wherein the extending tube portion extends to the inner wall surface of the through hole.

17. The battery top cover according to claim 16, characterized in that: The fixing ring of the pole and the radial outer surface of the step portion are provided with an anti-rotation plane, the inner wall surface of the lower shell and the inner wall surface of the upper shell are provided with an anti-rotation mating surface matching the anti-rotation plane to prevent rotation between them, the outer side surface of the covering body of the upper shell is provided with an anti-rotation plane matching the anti-rotation mating surface of the lower shell, the snap-fit ​​structure is provided on the anti-rotation plane of the lower shell, and the snap-fitting structure of the lower shell is provided on the upper side of the anti-rotation mating surface.

18. The battery top cover according to claim 17, characterized in that: An anti-rotation groove is provided on the side wall of the pole hole, and an anti-rotation block is formed on the outer side of the lower shell protruding outwards. The anti-rotation block is inserted into the anti-rotation groove to be placed and rotated.

19. A method for assembling a battery top cover as claimed in claim 1, characterized in that: The steps include: S101: Install the sealing member into the lower shell from top to bottom, and the edge of the sealing member is supported by the inner convex ring of the lower shell; S102: Press the pole into the lower shell from top to bottom, so that the lower surface of the fixing ring of the pole is in contact with and supported by the clamping ring of the seal; S103: Pressing the upper shell into the lower shell and pre-fastening it, the connecting portion of the pole extending upwards out of the upper shell; S104: installing the assembled pole assembly into the pole hole of the cover plate, with the lower surface of the clamping ring of the seal supported on the bottom wall surface; S105: The upper portion of the side wall is riveted radially inward to form a flange pressed on the upper shell, the flange applies sufficient pressing force downward to deform the seal to achieve sealing, and when viewed in the vertical projection direction, the flange at least partially overlaps with the fixing ring.

20. A power battery, characterized in that: It includes the battery top cover, battery shell and battery cells encapsulated in the battery shell as described in claim 1, the battery top cover is installed on the battery shell and the battery cells are enclosed in the battery shell, the battery cells are connected to the lower surface of the pole through an adapter, and the adapter passes through the through hole and is welded to the bottom surface of the pole.

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