Battery top cover and battery shell

Abstract

The utility model relates to the technical field of batteries, in particular to a battery top cover and a battery shell. The battery top cover comprises a cover plate with a first mounting hole, a pole arranged in the first mounting hole, a pressing plate which is arranged on the upper side surface of the cover plate and is used for pressing the pole, an upper separator for separating the pressing plate from the cover plate, and a sealing ring which is arranged in the first mounting hole and annularly sleeves the periphery of the pole, the lower isolation piece and the switching piece are arranged on the lower side surface of the cover plate and are used for isolating the pole from the cover plate; the pole comprises a pole body, a disc coaxially arranged at the lower end of the pole body and a boss coaxially arranged on the lower side surface of the disc; a second mounting hole is formed in the adapter plate; and the boss is arranged in the second mounting hole in a penetrating manner and is welded with the adapter plate.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery top cover and battery casing. Background Technology

[0002] With the rapid development of industries such as electric vehicles and energy storage equipment, rechargeable batteries have become a major energy storage device. Due to dwindling global oil resources and increasing environmental pressure, the development of green and environmentally friendly new energy storage equipment has become a hot topic in green industrial technology transformation. Rechargeable batteries, due to their high energy density and portability, have been successfully applied in fields such as 3C consumer electronics, new energy vehicles, and photovoltaic energy storage.

[0003] Most secondary batteries consist of a casing, battery cells housed within the casing, and a battery top cover assembly located on the upper side of the casing. The battery top cover assembly is a core component ensuring the safety and sealing of the secondary battery, playing a crucial role in current conduction and explosion-proof safety. The battery top cover typically includes a cover plate, terminals, sealing rings, upper separators, and lower separators. In existing technologies, terminals typically include a terminal body and a rectangular base integrally formed on the lower end face of the terminal body. The rectangular base is welded to an adapter plate for connection with the tabs. During the terminal manufacturing process, the rectangular base and terminal body need to be formed sequentially through cold forging and machining processes. In the welding process between the rectangular base and the adapter plate, due to the large contact area, ultrasonic welding is often required. Ultrasonic welding involves high pressure, which can easily deform the adapter plate, leading to gaps between the rectangular base and the adapter plate, reducing conductivity. Furthermore, the eccentric arrangement between the terminal body and the rectangular base results in high material waste, low material utilization, and increased product costs. Utility Model Content

[0004] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is to provide a battery top cover and a battery casing.

[0005] To solve the above-mentioned technical problems, the present invention provides a battery top cover, comprising a cover plate having a first mounting hole, a terminal post disposed in the first mounting hole, a pressure plate disposed on the upper side of the cover plate and pressing the terminal post, an upper isolation member for isolating the pressure plate and the cover plate, a sealing ring disposed in the first mounting hole and surrounding the outer periphery of the terminal post, a lower isolation member disposed on the lower side of the cover plate and for isolating the terminal post and the cover plate, and an adapter plate. The terminal post includes a terminal post body, a disk coaxially disposed at the lower end of the terminal post body, and a boss coaxially disposed on the lower side of the disk. The adapter plate is provided with a second mounting hole, and the boss passes through the second mounting hole and is welded to the adapter plate.

[0006] Furthermore, the boss and the second mounting hole are welded together using a laser welding process.

[0007] Furthermore, the adapter includes a horizontally distributed first adapter and a vertically distributed second adapter connected to the edge of the first adapter. The first adapter has a second mounting hole at a position corresponding to the boss, and the second adapter is used to connect to the electrode tab.

[0008] Furthermore, the pole body has a first section with a diameter smaller than that of the first mounting hole and a riveting section coaxially formed at the upper end of the first section. The riveting section has a second section with a diameter smaller than that of the first section and a third section formed at the upper end of the second section with a diameter larger than that of the second section. The first section passes through the first mounting hole and its upper end face abuts against the lower side of the pressure plate. The pressure plate is coaxially provided with stepped riveting holes, which surround the outer periphery of the second section and the third section.

[0009] Furthermore, the upper side of the cover plate has a first press-fit ring groove surrounding the outer periphery of the first mounting hole, and the bottom surface of the first press-fit ring groove is lower than the upper side of the cover plate; the upper spacer has a surrounding wall surrounding the outer periphery of the pressure plate, a bottom wall formed between the lower side of the pressure plate and the upper side of the cover plate, a first through hole formed on the bottom wall and coaxial with the first mounting hole, and a press-fit protrusion extending downward from the bottom wall to the bottom surface of the first press-fit ring groove, the press-fit protrusion coaxially surrounding the outer periphery of the first through hole.

[0010] Furthermore, the diameter of the first perforation is adapted to the diameter of the first section, the inner diameter of the press-fitting protrusion is adapted to the diameter of the first mounting hole, and both the inner diameter of the press-fitting protrusion and the diameter of the first mounting hole are larger than the diameter of the first section and are adapted to the diameter of the sealing ring.

[0011] Furthermore, a first groove is provided on the cover plate at the position corresponding to the pressure plate, the planar dimensions of the first groove are adapted to the planar dimensions of the upper isolation member, and the bottom wall of the upper isolation member is accommodated in the first groove; the first press-fit ring groove and the first mounting hole are both provided on the bottom surface of the first groove.

[0012] Furthermore, the outer surface of the pressure plate is configured as a first concave-convex mating surface, and the inner surface of the enclosure is configured as a second concave-convex mating surface that mates with the first concave-convex mating surface; or

[0013] The outer side of the upper section of the pressure plate protrudes outward from the outer side of its lower section, forming a first step between the two; the inner side of the upper section of the enclosure wall is recessed outward from the inner side of its lower section, forming a second step that matches the first step between the two.

[0014] Furthermore, the lower isolator is provided with a second through hole coaxial with the first mounting hole at the position corresponding to the pole post. The diameter of the second through hole is larger than the diameter of the first mounting hole and smaller than the diameter of the disk. The sealing ring is sleeved around the outer periphery of the pole post body. The sealing ring has a first sealing ring pressed between the upper side of the disk and the lower side of the lower isolator, a second sealing ring protruding from the upper side of the first sealing ring and having an outer diameter smaller than the first sealing ring, and a third sealing ring protruding from the upper side of the second sealing ring and having an outer diameter smaller than the second sealing ring. The upper side of the second sealing ring is tightly fitted with the lower side of the cover plate. The third sealing ring passes through the first mounting hole and the press-fitting protrusion ring, and its upper side is tightly fitted with the lower side of the upper isolator.

[0015] To solve the above-mentioned technical problems, the present invention provides a battery casing, including the battery top cover mentioned above.

[0016] In summary, the battery top cover and battery casing have at least the following beneficial effects: The terminal block base is designed as a coaxial disc structure, which can be made into a columnar structure with the same diameter as the disc during blanking. The shape is then machined to obtain the terminal block structure, reducing the need for cold forging of rectangular base terminal blocks, optimizing the terminal block manufacturing process, saving raw materials, and reducing costs. The single-piece weight of the disc terminal block is lighter than that of the rectangular base terminal block, resulting in significant weight reduction; the overall strength of the disc terminal block is also higher. A boss is coaxially provided on the lower side of the terminal block base, passing through the adapter plate. Based on this structure, the traditional ultrasonic welding process is changed to a laser welding process, reducing the holding force on the adapter plate, lowering the probability of damage to the adapter plate, and improving the conductive connection performance between the terminal block and the adapter plate. Furthermore, the height of the boss is the same as the height of the adapter plate, and it passes through the second mounting hole of the adapter plate, which reduces the overall height compared to the traditional ultrasonic welding connection method. The adapter plate is configured in an L-shape, allowing the electrode tabs to be welded to the vertically distributed second adapter plate, which helps improve the space utilization and energy density of the cell. The outer surface of the pressure plate is configured with a concave-convex surface, and the upper isolator is correspondingly configured with a concave-convex surface, which can increase the bonding performance between the pressure plate and the upper isolator. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of the battery top cover of this utility model.

[0019] Figure 2 yes Figure 1 Exploded view.

[0020] Figure 3 This is a schematic diagram of the structure of the electrode post in one embodiment of the battery top cover of this utility model.

[0021] Figure 4 This is a longitudinal sectional view of an embodiment of the battery top cover of this utility model.

[0022] Figure 5 This is a longitudinal sectional view of an embodiment of the battery top cover of this utility model, in which the sealing ring structure is hidden.

[0023] Figure 6 yes Figure 5 A magnified schematic diagram of part A in the middle.

[0024] The diagrams in the instruction manual are labeled as follows:

[0025] Cover plate 100; First groove 110; First mounting hole 101; First press-fit ring groove 120;

[0026] Pole post 200; Pole post body 210; First section 211; Second section 212; Third section 213; Disk 220; Boss 230; First gap J1; Second gap J2;

[0027] Pressure plate 300; Step rivet hole 310; Upper outer side 320; Lower outer side 330;

[0028] Upper isolation element 400; bottom wall 410; enclosure wall 420; upper inner side 421; lower inner side 422; accommodating space 430; first perforation 440; press-fitting protrusion ring 450;

[0029] Sealing ring 500; First sealing ring 510; Second sealing ring 520; Third sealing ring 530;

[0030] Lower isolation element 600; second perforation 610; second press-fit ring groove 620; second groove 630;

[0031] Adapter piece 700; second mounting hole 701; first adapter piece 710; second adapter piece 720. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0035] Please see Figure 1 and Figure 2 In the illustrated embodiment, the battery top cover includes a cover plate 100 having a first mounting hole 101, a terminal post 200 mounted in the first mounting hole 101, a pressure plate 300 disposed on the upper side of the cover plate 100 and pressing the terminal post 200 thereon, an upper spacer 400 for isolating the pressure plate 300 from the cover plate 100, a sealing ring 500 for sealing the gap between the terminal post 200 and the cover plate 100, a lower spacer 600 disposed on the lower side of the cover plate 100 and for isolating the terminal post 200 from the cover plate 100, and an adapter piece 700 disposed on the lower side of the cover plate 100 and connected to the terminal post 200. The adapter piece 700 connects to a tab (not shown). The terminal post 200 can be configured as one terminal post 200, for example, one negative terminal post 200, or as two terminal posts 200, for example, two negative terminal posts 200. When configured with two pole posts 200, there are two corresponding sealing rings 500, which are respectively wrapped around the outer periphery of the two pole posts 200.

[0036] Please see Figure 3 The pole post 200 has a pole post body 210, a disk 220 coaxially disposed at the lower end of the pole post body 210, and a boss 230 coaxially disposed on the lower side of the disk 220. The diameter of the pole post body 210 is smaller than the diameter of the first mounting hole 101 so that it can be movably inserted into the first mounting hole 101, and the diameter of the disk 220 is larger than the diameter of the pole post 200 so that it is blocked by the first mounting hole 101 on the lower side of the cover plate 100.

[0037] The upper end of the pole body 210 is riveted to the pressure plate 300. The pole body 210 can be configured as a first section 211 distributed sequentially from bottom to top and a riveting section coaxially disposed on the upper end of the first section 211. The diameter of the first section 211 is smaller than the diameter of the first mounting hole 101. The riveting section has a second section 212 coaxially disposed on the upper end of the first section 211 and having a diameter smaller than that of the first section 211, and a third section 213 coaxially disposed on the upper end of the second section 212 and having a diameter larger than that of the second section 212. The diameter of the third section 213 can be the same as the diameter of the first section 211, or the diameter of the third section 213 can be smaller than that of the first section 211. The diameter of the disk 220 is larger than the diameter of the first mounting hole 101, and the diameter of the boss 230 is smaller than the diameter of the disk 220. For example, the diameter of the boss 230 can be the same as the diameter of the pole body 210 (the same as the diameter of the first section 211).

[0038] Please see Figure 4 and Figure 5 When the pole post 200 is installed in the first mounting hole 101, a first gap J1 is formed between the upper side of the disc 220 and the lower side of the cover plate 100. The first gap J1 allows the corresponding part of the lower isolator 600 and the corresponding part of the sealing ring 500 to be tightly fitted within it. When the pole post 200 is installed in the first mounting hole 101, the first section 211 passes through the first mounting hole 101, and a second gap J2 is formed between the first section 211 and the first mounting hole 101. The second gap J2 is annular, and the sealing ring 500 is tightly fitted within the second gap J2, with the upper side of the sealing ring 500 tightly fitted with the lower side of the upper isolator 400. When the pole post 200 is installed in the first mounting hole 101, the upper end of the first section 211 abuts against the lower side of the pressure plate 300, and the riveting section is riveted to the pressure plate 300.

[0039] Please continue reading Figure 2 A first groove 110 is provided on the cover plate 100 at a position corresponding to the pressure plate 300. The planar dimensions of the first groove 110 are adapted to the planar dimensions of the upper spacer 400 to accommodate and limit the upper spacer 400. A first mounting hole 101 is provided at the first groove 110 and extends downward through the cover plate 100 from the bottom surface of the first groove 110.

[0040] Please see Figure 6To facilitate the assembly of the sealing ring 500 and enhance the bonding force and sealing effect with it, a first press-fitting ring groove 120 is formed on the upper side of the cover plate (e.g., the bottom surface of the first groove 110) surrounding the outer periphery of the first mounting hole 101. The bottom surface of the first press-fitting ring groove 120 is lower than the upper side of the cover plate 100 (e.g., the bottom surface of the first groove 110). The outer diameter of the first press-fitting ring groove 120 is larger than the diameter of the first mounting hole 101, and the diameter of the first mounting hole 101 is larger than the diameter of the first section 211 and is adapted to the outer diameter of the sealing ring 500.

[0041] Please continue reading Figure 2 The pressure plate 300 is coaxially provided with stepped riveting holes 310 at a position corresponding to the pole body 210. The stepped riveting holes 310 surround the outer periphery of the second section 212 and the third section 213 of the pole body 210. To enhance the bonding force between the outer periphery of the pressure plate 300 and the upper spacer 400, the outer surface of the pressure plate 300 is configured as a first concave-convex mating surface. For example, the upper outer surface 320 of the pressure plate 300 protrudes outward from its lower outer surface 330, forming a first step between the two.

[0042] The upper isolating member 400 includes a bottom wall 410 and a surrounding wall 420 arranged around the bottom wall 410. The surrounding wall 420 and the bottom wall 410 enclose a receiving space 430 for accommodating the pressure plate 300. The bottom wall 410 is located between the lower side of the pressure plate 300 and the upper side of the cover plate 100 (the bottom surface of the first groove 110). The surrounding wall 420 surrounds the outer periphery of the pressure plate 300. Corresponding to the first concave-convex mating surface of the pressure plate 300, the inner side of the surrounding wall 420 is configured as a second concave-convex mating surface that mates with the first concave-convex mating surface. For example, the upper inner side 421 of the surrounding wall 420 is recessed outwardly into its lower inner side 422, forming a second step that matches the first step.

[0043] Please continue reading Figure 6The bottom wall 410 has a first through hole 440 coaxially arranged with the first mounting hole 101. The first through hole 440 is used for the pole body 210, for example, the first section 211, to pass through. The diameter of the first through hole 440 must be adapted to the diameter of the first section 211. After the first section 211 passes through the first through hole 440, it abuts against the lower side of the pressure plate 300. The lower side of the bottom wall 410 also has a press-fitting protrusion ring 450 extending downward. The press-fitting protrusion ring 450 is coaxially surrounded around the outer periphery of the first through hole 440, and the inner diameter of the press-fitting protrusion ring 450 is the same as the inner diameter of the first mounting hole 101. They are both larger than the diameter of the first section 211 and are adapted to the diameter of the sealing ring 500. The press-fitting protrusion ring 450 and the first press-fitting ring groove 120 form a second gap J2 with the first section 211, so that the sealing ring 500 can be tightly fitted inside.

[0044] When the pressure plate 300, upper isolator 400, pole post 200 and cover plate 100 are assembled together, the pressure plate 300 is located in the receiving space 430 of the upper isolator 400; the bottom wall 410 of the upper isolator 400 is received in the first groove 110, the press-fitting protrusion 450 on the lower side of the upper isolator 400 is press-fitted in the first press-fitting ring groove 120, and the press-fitting protrusion 450 abuts against the bottom surface of the first press-fitting ring groove 120; the first section 211 of the pole post body 210 passes through the first mounting hole 101 and the first through hole 440 in sequence and abuts against the lower side of the pressure plate 300, and the riveting section of the pole post body 210 is riveted together with the stepped riveting hole 310 of the pressure plate 300; the disc 220 is located on the lower side of the cover plate 100.

[0045] The lower isolator 600 has a second through hole 610 coaxially disposed at a position corresponding to the pole body 210. The diameter of the second through hole 610 is larger than the diameter of the first mounting hole 101 and smaller than the diameter of the disc 220. When the lower isolator 600 is assembled on the lower side of the cover plate 100, the lower side of the cover plate 100 has an annular surface exposed in the second through hole 610. The annular surface and the hole wall of the second through hole 610 enclose a second press-fitting annular groove 620. The lower side of the lower isolator 600 has a second groove 630 coaxial with the second through hole 610 and surrounding the outer periphery of the second through hole 610. The second groove 630 is an annular groove with its bottom facing upward and its opening facing downward. The pole body 210 is inserted upward through the second through hole 610, the disc 220 is accommodated in the second groove 630, and a pressing space 640 is formed between its upper side and the bottom surface of the second groove 630 for pressing the outer periphery of the sealing ring 500 into it.

[0046] Please continue reading Figure 2 and Figure 4 The height of the sealing ring 500 is adapted to the height of the first section 211 of the pole body 210. The sealing ring 500 has a first sealing ring 510 arranged in a ring shape from bottom to top, a second sealing ring 520 protruding from the upper side of the first sealing ring 510 and having an outer diameter smaller than the first sealing ring 510, and a third sealing ring 530 protruding from the upper side of the second sealing ring 520 and having an outer diameter smaller than the second sealing ring 520. The first sealing ring 510 has a first outer peripheral edge extending radially beyond the second sealing ring 520, and is press-fitted into the press-fitting space 640. The second sealing ring 520 has a second outer peripheral edge extending radially beyond the third sealing ring 530, and the second outer peripheral edge is press-fitted into the second press-fitting ring groove 620, that is, the upper side of the second outer peripheral edge of the sealing ring 500 is tightly fitted with the bottom surface of the groove of the second press-fitting ring groove 620. The third sealing ring 530 is press-fitted into the second gap J2, that is, the third sealing ring 530 passes through the first mounting hole 101 and the press-fitting protrusion 450, and its upper side is tightly fitted with the lower side of the upper spacer 400. The first sealing ring 510, the second sealing ring 520 and the third sealing ring 530 are all sleeved on the outer periphery of the first section 211.

[0047] The adapter piece 700 is disposed on the lower side of the lower isolator 600. The adapter piece 700 has a second mounting hole 701. The boss 230 of the pole post 200 passes through the second mounting hole 701 and is welded to the adapter piece 700. Preferably, the boss 230 is welded to the second mounting hole 701 using a laser welding process. The adapter piece 700 includes a horizontally distributed first adapter piece 710 and a vertically distributed second adapter piece 720 connected to the edge of the first adapter piece 710. The first adapter piece 710 has the second mounting hole 701 at a position corresponding to the boss 230. The second adapter piece 720 is used to connect to the electrode tab.

[0048] This utility model also discloses a battery casing, which includes the battery top cover described above.

[0049] Based on the above embodiments, the battery top cover and battery casing have at least the following beneficial effects: The terminal post 200 chassis is designed as a coaxial disc 220 structure. During blanking, it can be made into a columnar structure with the same diameter as the disc 220, and then its shape is machined to obtain the terminal post 200 structure. This reduces the need for cold heading steps required for rectangular chassis terminal posts 200, optimizes the terminal post 200 manufacturing process, saves raw materials, and reduces costs. The single piece weight of the disc terminal post is lighter than that of the rectangular chassis terminal post 200, which can significantly reduce weight; the overall strength of the disc terminal post is higher. A boss 230 is coaxially disposed on the lower side of the electrode post 200 chassis, passing through the adapter piece 700. Based on this structure, the traditional ultrasonic welding process is changed to a laser welding process, reducing the holding force on the adapter piece 700, reducing the probability of damage to the adapter piece 700, and improving the conductive connection performance between the electrode post 200 and the adapter piece 700. In addition, the height of the boss 230 is the same as the height of the adapter piece 700, and it passes through the second mounting hole 701 of the adapter piece 700. Compared with the traditional ultrasonic welding connection method, the overall height can be reduced. The adapter piece 700 is configured with an L-shaped structure, which allows the electrode tab to be welded to the vertically distributed second adapter piece 720, which is beneficial to improving the space utilization and energy density of the battery cell. The outer surface of the pressure plate 300 is configured with a concave-convex surface, and the upper isolator 400 is correspondingly configured with a concave-convex surface, which can increase the bonding performance between the pressure plate 300 and the upper isolator 400.

[0050] The above embodiments only illustrate preferred implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A battery top cover, comprising a cover plate having a first mounting hole, an electrode post disposed in the first mounting hole, a pressure plate disposed on the upper side of the cover plate and pressing the electrode post thereon, an upper spacer for isolating the pressure plate and the cover plate, a sealing ring disposed in the first mounting hole and surrounding the outer periphery of the electrode post, a lower spacer disposed on the lower side of the cover plate and for isolating the electrode post and the cover plate, and an adapter piece, characterized in that: The pole includes a pole body, a disk coaxially disposed at the lower end of the pole body, and a boss coaxially disposed on the lower side of the disk; the adapter plate is provided with a second mounting hole, and the boss passes through the second mounting hole and is welded to the adapter plate.

2. The battery top cover as described in claim 1, characterized in that: The boss and the second mounting hole are welded together using laser welding.

3. The battery top cover as described in claim 1, characterized in that: The adapter includes a horizontally distributed first adapter and a vertically distributed second adapter connected to the edge of the first adapter. The first adapter has a second mounting hole at a position corresponding to the boss. The second adapter is used to connect to the electrode tab.

4. The battery top cover as described in claim 1, characterized in that: The pole body has a first section with a diameter smaller than that of the first mounting hole and a riveting section coaxially formed at the upper end of the first section. The riveting section has a second section with a diameter smaller than that of the first section and a third section formed at the upper end of the second section with a diameter larger than that of the second section. The first section passes through the first mounting hole and its upper end face abuts against the lower side of the pressure plate. The pressure plate is coaxially provided with stepped riveting holes, which surround the outer periphery of the second section and the third section.

5. The battery top cover as described in claim 4, characterized in that: The upper side of the cover plate has a first press-fitting ring groove surrounding the outer periphery of the first mounting hole, and the bottom surface of the first press-fitting ring groove is lower than the upper side of the cover plate; the upper partition has a surrounding wall surrounding the outer periphery of the pressure plate, a bottom wall formed between the lower side of the pressure plate and the upper side of the cover plate, a first through hole formed on the bottom wall and coaxial with the first mounting hole, and a press-fitting protrusion extending downward from the bottom wall to the bottom surface of the first press-fitting ring groove, and the press-fitting protrusion coaxially surrounding the outer periphery of the first through hole.

6. The battery top cover as described in claim 5, characterized in that: The diameter of the first perforation is adapted to the diameter of the first section, the inner diameter of the press-fitting convex ring is adapted to the diameter of the first mounting hole, and both the inner diameter of the press-fitting convex ring and the diameter of the first mounting hole are larger than the diameter of the first section and are adapted to the diameter of the sealing ring.

7. The battery top cover as described in claim 5, characterized in that: A first groove is provided on the cover plate at the position corresponding to the pressure plate. The planar dimensions of the first groove are adapted to the planar dimensions of the upper isolation member, and the bottom wall of the upper isolation member is accommodated in the first groove. The first press-fit ring groove and the first mounting hole are both located on the bottom surface of the first groove.

8. The battery top cover as described in claim 5, characterized in that: The outer surface of the pressure plate is configured as a first concave-convex mating surface, and the inner surface of the enclosure is configured as a second concave-convex mating surface that mates with the first concave-convex mating surface; or The outer side of the upper section of the pressure plate protrudes outward from the outer side of its lower section, forming a first step between the two; the inner side of the upper section of the enclosure wall is recessed outward from the inner side of its lower section, forming a second step that matches the first step between the two.

9. The battery top cover as described in claim 5, characterized in that: The lower isolator has a second through hole coaxial with the first mounting hole at the position corresponding to the pole body. The diameter of the second through hole is larger than the diameter of the first mounting hole and smaller than the diameter of the disk. The sealing ring is sleeved around the outer periphery of the pole body. The sealing ring has a first sealing ring pressed between the upper side of the disk and the lower side of the lower isolator, a second sealing ring protruding from the upper side of the first sealing ring and having an outer diameter smaller than the first sealing ring, and a third sealing ring protruding from the upper side of the second sealing ring and having an outer diameter smaller than the second sealing ring. The upper side of the second sealing ring is tightly fitted with the lower side of the cover plate. The third sealing ring passes through the first mounting hole and the press-fitting protrusion, and its upper side is tightly fitted with the lower side of the upper isolator.

10. A battery casing, characterized in that: Includes the battery top cover as described in any one of claims 1 to 9.

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