Method of assembling a battery top cover assembly

Abstract

This invention relates to the technical field of battery top cover assembly, and discloses a method for assembling a battery top cover assembly, including the following assembly steps: 1) Providing a top cover sheet with mounting holes, mounting an upper fixing member on the upper surface of the top cover sheet, the upper fixing member having a lower extension extending into the mounting holes, and positioning a lower fixing member on the lower surface of the top cover sheet, the lower fixing member having an upper extension extending into the mounting holes; 2) Welding and fixing the upper fixing member and the lower fixing member to the top cover sheet respectively, and welding and fixing the lower extension to the upper extension to form a fixing assembly; the fixing assembly surrounds and forms an installation area; 3) Installing a sealing ring in the installation area; 4) Installing the terminal post into the installation area, pressing to achieve a set compression amount of the sealing ring; 5) Injecting glue into the installation area to form a glue injection ring, the glue injection ring fixing the terminal post and the fixing assembly relative to each other; 6) Installing a lower plastic part on the lower surface of the top cover sheet to form a battery top cover.

Description

Technical Field

[0001] This invention relates to the technical field of battery top cover assembly, and more specifically, to a method for assembling a battery top cover assembly. Background Technology

[0002] Batteries are energy storage sources with many useful and practical applications. The battery top cover is a key structure in the battery. It covers the casing and can be connected to the battery cells inside the casing, as well as to the outside.

[0003] The battery top cover includes the top cover plate and the terminals. As one of the important structural components of the battery, the quality of the connection of the terminals directly affects the battery's performance and lifespan. One end of the terminal is directly connected to the busbar, and the other end is connected to an external conductor. In battery production, terminals are commonly used conductors.

[0004] In the existing technology, during the assembly of the battery top cover, the top cover sheet needs to be stamped multiple times to form a stepped groove. At the same time, the terminal post and the fixing part are coated with rubber to form a coated part. The fixing part on the coated part is used to position and install the terminal post at the stepped groove. The sealing ring is installed between the side wall of the coated part and the side wall of the mounting hole. The sealing ring is squeezed by the side wall of the mounting hole and the coated part to achieve a certain compression. Then, the fixing part and the top cover sheet are fixedly connected by welding, so that the terminal post is assembled on the top cover. However, during the welding of the fixing part, the sealing ring is prone to displacement, and the overall assembly process is relatively complicated. Summary of the Invention

[0005] The purpose of this invention is to provide an assembly method for a battery top cover assembly, which aims to solve the problem that the battery top cover assembly process is relatively complex in the prior art.

[0006] This invention is implemented as follows: the assembly method of the battery top cover assembly includes the following assembly steps:

[0007] 1) A top cover plate is provided, wherein a through mounting hole is provided on the top cover plate, and a circumferential upper fixing member is positioned and installed on the upper surface of the top cover plate from top to bottom. The upper fixing member has a lower extension extending into the mounting hole, and the lower extension is arranged around the mounting hole in a circumferential direction. A circumferential lower fixing member is positioned and installed on the lower surface of the top cover plate from bottom to top. The lower fixing member has an upper extension extending into the mounting hole, and the upper extension is arranged around the mounting hole in a circumferential direction. The bottom of the lower extension is aligned vertically and presses against the top of the upper extension.

[0008] 2) The upper fixing member and the lower fixing member are welded and fixed to the top cover plate respectively, and the bottom of the lower extension section is welded and fixed to the top of the upper extension section. The upper fixing member and the lower fixing member are fixedly connected to form a fixing assembly. The fixing assembly is arranged in a ring shape and surrounds the installation area for the pole post to be installed.

[0009] 3) Provide a sealing ring; install the sealing ring in the installation area;

[0010] 4) Provide the electrode post; install the electrode post into the installation area, and use the mold to press the sealing ring to achieve the set compression amount;

[0011] 5) Apply adhesive to the installation area, where an adhesive injection ring is formed, which fixes the pole post and the fixing component relative to each other;

[0012] 6) Provide a lower plastic part; fix the lower plastic part on the lower surface of the top cover sheet to form a battery top cover.

[0013] Optionally, the upper fixing member is positioned and installed on the upper surface of the top cover plate by an upper positioning ring;

[0014] In assembly step 4), glue is injected into the glue injection interval until the glue injection ring completely fills the glue injection interval and covers the upper surface of the upper ring and the upper positioning ring, thus forming the glue injection ring.

[0015] Optionally, the lower surface of the top cover sheet is provided with a downwardly protruding mounting ring, and the upper surface of the lower plastic part is provided with a mounting groove for the mounting ring to be installed. The mounting ring and the mounting groove cooperate to fix the lower plastic part and the top cover sheet together.

[0016] In assembly step 6), the upper surface of the lower plastic part is pressed against the lower surface of the top cover plate, the lower plastic part is elastically deformed until the mounting ring is embedded in the mounting groove, the lower plastic part is elastically reset, and the mounting ring and the mounting groove cooperate to fix the top cover plate and the lower plastic part together.

[0017] Optionally, along the top-to-bottom direction, the upper end of the mounting ring is connected to the top cover plate, the lower part of the mounting ring is bent outwards and extended away from the blast hole, and the mounting groove is consistent with the contour of the mounting ring;

[0018] Along the extending direction of the mounting ring, the mounting ring has a lower extension section extending longitudinally downward, the lower extension section being arranged around the blast hole; the end of the lower extension section bends outward away from the blast hole to form a bent section, the bent section being arranged around the blast hole; the end of the bent section extends upward at an angle away from the blast hole to form an inclined section; under the action of the lower extension section, the bent section and the inclined section, the lower plastic part is fixedly hung below the top cover plate;

[0019] In assembly step 6), the upper surface of the lower plastic part is pressed against the lower surface of the top cover plate, the lower plastic part is elastically deformed, the bent section, the inclined section and the lower extension section are sequentially inserted into the mounting groove, the lower plastic part is elastically reset, the mounting ring cooperates with the mounting groove, and the top cover plate is fixedly connected to the lower plastic part.

[0020] Optionally, the lower fixing member has a circumferentially arranged outer peripheral surface, and the outer peripheral surface is provided with an outer peripheral ring that protrudes outward from the pole post, and the outer peripheral ring is arranged circumferentially along the circumferential direction of the outer peripheral surface;

[0021] The lower plastic part has a covering section covering the outer surface of the lower positioning ring and the outer surface of the lower ring. The covering section has an inwardly recessed embedding groove that is fitted to the outer circumferential ring. In assembly step 6), the outer circumferential ring is embedded into the embedding groove. Under the cooperation of the outer circumferential ring and the embedding groove, the fixing member and the lower plastic part are relatively fixed.

[0022] Optionally, the upper annular surface is provided with a downwardly protruding limiting ring, the limiting ring is arranged around the upper annular surface in the surrounding direction, and the upper surface of the top cover is provided with a downwardly recessed limiting groove, the limiting groove is arranged in a surrounding shape, and the limiting ring cooperates with the limiting groove.

[0023] In assembly step 1), the lower extension is inserted into the mounting hole from top to bottom, and the limiting ring is embedded into the limiting groove from top to bottom until the upper annular surface presses against the upper surface of the top cover plate.

[0024] Optionally, the upper annular surface is provided with an upwardly recessed sealing groove, the sealing groove is arranged around the upper annular surface in the circumferential direction, the sealing groove is spaced apart from the limiting ring, and the sealing groove is arranged between the limiting ring and the lower extension; an elastic water-stop layer is fixed on the bottom of the sealing groove, and in the natural state, the bottom of the water-stop layer is exposed below the upper annular surface.

[0025] In assembly step 1), the lower extension is inserted into the mounting hole from top to bottom, and the water-stop layer is pressed against the upper surface of the top cover plate. Under the action of gravity, the water-stop layer is compressed and deformed until the bottom of the water-stop layer is flush with the opening of the sealing groove.

[0026] Compared with the prior art, the battery top cover assembly method provided by the present invention first positions and installs the upper and lower fixing parts on the mounting holes during the assembly process, then welds the upper and lower fixing parts to form a fixing assembly, and then installs the terminal post and sealing ring into the mounting area and wraps them together to form a wrapped part, thus forming the battery top cover. This simplifies the assembly steps of the battery top cover and improves production efficiency. Attached Figure Description

[0027] Figure 1 This is a three-dimensional schematic diagram of the battery top cover provided by the present invention;

[0028] Figure 2 This is a cross-sectional schematic diagram of the battery top cover provided by the present invention;

[0029] Figure 3 This invention provides Figure 2 Enlarged view of point A in the middle;

[0030] Figure 4 This is a three-dimensional schematic diagram of the upper fixing member provided by the present invention;

[0031] Figure 5 This is a three-dimensional schematic diagram of the lower fixing member provided by the present invention;

[0032] Figure 6 This is a three-dimensional schematic diagram of the pole provided by the present invention;

[0033] Figure 7 This is a cross-sectional schematic diagram of the battery top cover provided by the present invention;

[0034] Figure 8 This is a cross-sectional schematic diagram of the battery top cover provided by the present invention;

[0035] Figure 9 This is a cross-sectional schematic diagram of the battery top cover provided by the present invention. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0037] The implementation of the present invention will be described in detail below with reference to specific embodiments.

[0038] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0039] Reference Figure 1-9 The image shown is a preferred embodiment of the present invention.

[0040] The assembly method for the battery top cover assembly provided by the present invention includes the following assembly steps:

[0041] 1) A top cover plate 100 is provided, and the top cover plate 100 has a through mounting hole. An upper fixing member 210 in a ring shape is positioned and installed on the upper surface of the top cover plate 100 from top to bottom. The upper fixing member 210 has a lower extension 211 extending into the mounting hole. The lower extension 211 is arranged around the mounting hole in a ring direction. A lower fixing member 220 in a ring shape is positioned and installed on the lower surface of the top cover plate 100 from bottom to top. The lower fixing member 220 has an upper extension 221 extending into the mounting hole. The upper extension 221 is arranged around the mounting hole in a ring direction. The bottom of the lower extension 211 is aligned vertically and presses against the top of the upper extension 221.

[0042] 2) The upper fixing member 210 and the lower fixing member 220 are welded and fixed to the top cover plate 100 respectively, and the bottom of the lower extension 211 and the top of the upper extension 221 are welded and fixed together. The upper fixing member 210 and the lower fixing member 220 are fixedly connected to form a fixing assembly. The fixing assembly is arranged in a ring shape and surrounds the installation area for the pole post 300 to be installed.

[0043] 3) Provide sealing ring 500; install sealing ring 500 in the installation area;

[0044] 4) Provide pole post 300; install pole post 300 into the installation area, and use the mold to press the sealing ring 500 to achieve the set compression amount;

[0045] 5) Apply adhesive to the installation area to form an adhesive injection ring 400, which fixes the pole post 300 relative to the fixing component.

[0046] 6) Provide a lower plastic part 600; fix the lower plastic part 600 on the lower surface of the top cover 100 to form a battery top cover.

[0047] The assembly method of the battery top cover assembly provided above involves first positioning and installing the upper fixing part 210 and the lower fixing part 220 on the mounting hole during the assembly process, then welding the upper and lower fixing parts 220 firmly to form a fixed assembly, and then installing the terminal post 300 and the sealing ring 500 into the installation area and wrapping them together to form a wrapped part, thus forming the battery top cover. This simplifies the assembly steps of the battery top cover and improves production efficiency.

[0048] The upper fixing member 210 is positioned and installed on the upper surface of the top cover plate 100 by the upper positioning ring 212. The outer periphery of the upper fixing member 210 extends outward to form the upper positioning ring 212, which is arranged in a ring shape. The upper positioning ring 212 has an upper annular surface arranged downward.

[0049] In step 1), the lower extension 211 is inserted into the mounting hole from top to bottom until the upper annular surface presses against the upper surface of the top cover plate 100 from top to bottom. In this way, the upper fixing member 210 can be positioned and installed on the upper surface of the top cover plate 100 by the upper positioning ring 212, and at the same time, it facilitates the subsequent fixing of the upper fixing ring by welding.

[0050] The lower fixing member 220 is positioned and installed on the lower surface of the top cover plate 100 by the lower positioning ring 222. The outer periphery of the lower fixing member 220 extends outward to form the lower positioning ring 222, which is arranged in a ring shape. The lower positioning ring 222 has an upward-facing lower annular surface.

[0051] In step 1), the upper extension 221 is inserted into the mounting hole from bottom to top until the lower annular surface presses against the lower surface of the top cover plate 100 from bottom to top. In this way, the lower fixing member 220 can be positioned and installed on the lower surface of the top cover plate 100 by the lower positioning ring 222, and at the same time, it facilitates the subsequent fixing of the lower fixing ring by welding.

[0052] In step 3), the bottom of the lower fixing member 220 in the fixing assembly has a lower ring 223 extending toward the mounting area, and the lower ring 223 is arranged around the lower fixing member 220 in the surrounding direction; a sealing ring 500 is installed on the lower ring 223, and the bottom of the sealing ring 500 abuts against the lower ring 223. In this way, a support ring for installing the sealing ring 500 is formed, and after the injection ring 400 is formed, the connection structure between the injection ring 400 and the fixing assembly is increased, making the structure more stable.

[0053] In step 4), the pole post 300 has an outwardly expanding expansion ring 310 at its center. The expansion ring 310 is arranged around the outer circumference ring 224 of the pole post 300. The pole post 300 is installed in the installation area, and the expansion ring 310 is pressed against the sealing ring 500. The sealing ring 500 is clamped between the expansion ring 310 and the lower ring 223. Then, the pole post 300 is pressed down using a mold until the sealing ring 500 reaches the set compression amount. The pole post 300 and the sealing ring 500 form the first assembly. In this way, the sealing ring 500 is compressed to the set compression amount by the action of the expansion ring 310 and the lower ring 223.

[0054] Specifically, in step 4), the installation area includes an adhesive injection interval. There is an annular adhesive injection interval between the outer periphery of the first component and the fixing component. Adhesive is injected into the adhesive injection interval to form an adhesive injection ring 400, which completely fills the adhesive injection interval.

[0055] Specifically, the top of the upper fastener 210 has an upper ring 213 extending toward the mounting area, and the upper ring 213 is arranged around the upper fastener 210 along the surrounding direction.

[0056] In step 4), adhesive is injected into the injection gap until the injection ring 400 completely fills the injection gap and covers the upper surface of the upper ring 213 and the upper positioning ring 212, forming the injection ring 400. This increases the connection structure between the injection ring 400 and the fixing component, making the overall structure more stable.

[0057] The lower surface of the top cover plate 100 is provided with a downward protruding mounting ring 110, and the upper surface of the lower plastic part 600 is provided with a mounting groove for mounting the mounting ring 110 to be installed. The mounting ring 110 and the mounting groove cooperate to fix the lower plastic part 600 and the top cover plate 100 in a fixed connection.

[0058] In step 6), the upper surface of the lower plastic part 600 is pressed against the lower surface of the top cover plate 100. The lower plastic part 600 elastically deforms until the mounting ring 110 is embedded in the mounting groove. The lower plastic part 600 then elastically returns to its original position. The mounting ring 110 and the mounting groove cooperate to fix the top cover plate 100 and the lower plastic part 600 together. This achieves a snap-fit ​​connection, simplifying the connection between the lower plastic part 600 and the top cover plate 100.

[0059] Along the top-to-bottom direction, the upper end of the mounting ring 110 is connected to the top cover plate 100, and the lower part of the mounting ring 110 is bent outwards and arranged away from the blast hole. The mounting groove is consistent with the outline of the mounting ring 110.

[0060] Along the extending direction of the mounting ring 110, the mounting ring 110 has a longitudinally downward extending lower extension 211, which surrounds the blast hole; the end of the lower extension 211 bends outward away from the blast hole to form a bent section, which surrounds the blast hole; the end of the bent section extends upward at an angle away from the blast hole to form an inclined section; under the action of the lower extension 211, the bent section and the inclined section, the lower plastic part 600 is fixedly hung below the top cover plate 100;

[0061] In step 6), the upper surface of the lower plastic part 600 is pressed against the lower surface of the top cover plate 100. The lower plastic part 600 elastically deforms, and the bent section, inclined section, and lower extension section 211 are sequentially inserted into the mounting groove. The lower plastic part 600 elastically returns to its original position, the mounting ring 110 mates with the mounting groove, and the top cover plate 100 and the lower plastic part 600 are fixedly connected. In this way, after the lower plastic part 600 elastically returns to its original position, the lower plastic part 600 can be stably attached to the lower surface of the top cover plate 100.

[0062] The lower fixing member 220 has a circumferentially arranged outer peripheral surface, and an outer peripheral ring 224 is provided on the outer peripheral surface, which is formed to protrude outward from the pole post 300. The outer peripheral ring 224 is arranged around the outer peripheral surface in the circumferential direction.

[0063] The lower plastic part 600 has a covering section that covers the outer surface of the lower positioning ring 222 and the outer surface of the lower ring 223. The covering section has an inwardly recessed groove that mates with the outer peripheral ring 224. In step 6), the outer peripheral ring 224 is inserted into the groove. Under the action of the outer peripheral ring 224 and the groove, the fixing member and the lower plastic part 600 are relatively fixed. In this way, the outer peripheral ring 224 is inserted into the groove by the elastic deformation of the lower plastic part 600 itself, so that they are fixed to each other, which facilitates the installation of the lower plastic part 600.

[0064] In this embodiment, a downward protruding limiting ring 2120 is provided on the upper annular surface. The limiting ring 2120 is arranged around the upper annular surface in the surrounding direction. A downward recessed limiting groove is provided on the upper surface of the top cover plate 100. The limiting groove is arranged in a surrounding shape. The limiting ring 2120 cooperates with the limiting groove.

[0065] In step 1), the lower extension 211 is inserted into the mounting hole from top to bottom, and the limiting ring 2120 is embedded into the limiting groove from top to bottom until the upper annular surface presses against the upper surface of the top cover plate 100. This strengthens the connection between the upper fixing member and the top cover plate 100, and at the same time improves the sealing performance, with the limiting ring 2120 preventing the ingress of air.

[0066] In this embodiment, a sealing groove 2121 is provided on the upper annular surface, which is recessed upwards. The sealing groove 2121 is arranged around the upper annular surface in the surrounding direction. The sealing groove 2121 and the limiting ring 2120 are arranged at intervals, and the sealing groove 2121 is arranged between the limiting ring 2120 and the lower extension 211. An elastic water-stopping layer is fixed on the bottom of the sealing groove 2121. In the natural state, the bottom of the water-stopping layer is exposed below the upper annular surface.

[0067] In step 1), the lower extension 211 is inserted into the mounting hole from top to bottom, and the water-stop layer presses against the upper surface of the top cover plate 100. Under the action of gravity, the water-stop layer is compressed and deformed until the bottom of the water-stop layer is flush with the opening of the sealing groove 2121. In this way, the design of the elastic water-stop layer effectively enhances the sealing performance and waterproof performance.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for assembling a battery top cover assembly, characterized in that, The assembly process includes the following steps: 1) A top cover plate is provided, wherein a through mounting hole is provided on the top cover plate, and a circumferential upper fixing member is positioned and installed on the upper surface of the top cover plate from top to bottom. The upper fixing member has a lower extension extending into the mounting hole, and the lower extension is arranged around the mounting hole in a circumferential direction. A circumferential lower fixing member is positioned and installed on the lower surface of the top cover plate from bottom to top. The lower fixing member has an upper extension extending into the mounting hole, and the upper extension is arranged around the mounting hole in a circumferential direction. The bottom of the lower extension is aligned vertically and presses against the top of the upper extension. 2) The upper fixing member and the lower fixing member are welded and fixed to the top cover plate respectively, and the bottom of the lower extension section is welded and fixed to the top of the upper extension section. The upper fixing member and the lower fixing member are fixedly connected to form a fixing assembly. The fixing assembly is arranged in a ring shape and surrounds the installation area for the pole post to be installed. 3) Provide a sealing ring; install the sealing ring in the installation area; 4) Provide the electrode post; install the electrode post into the installation area, and use the mold to press the sealing ring to achieve the set compression amount; 5) Apply adhesive to the installation area, where an adhesive injection ring is formed, which fixes the pole post and the fixing component relative to each other; 6) Provide a lower plastic part; fix the lower plastic part on the lower surface of the top cover sheet to form a battery top cover; In assembly step 3), the bottom of the lower fixing member in the fixing assembly has a lower ring extending toward the mounting area, and the lower ring is arranged around the lower fixing member in the surrounding direction; the sealing ring is installed on the lower ring, and the bottom of the sealing ring abuts against the lower ring. In assembly step 4), the pole post has an outwardly expanding expansion ring in the middle. The expansion ring is arranged around the outer periphery of the pole post. The pole post is installed in the installation area, and the expansion ring is pressed against the sealing ring. The sealing ring is clamped between the expansion ring and the lower ring. The pole post is then pressed down using a mold until the sealing ring reaches a set compression amount. The pole post and the sealing ring form the first component. In assembly step 4), the installation area includes an adhesive injection interval. The outer periphery of the first component and the fixing component have an annular adhesive injection interval. Adhesive is injected into the adhesive injection interval to form the adhesive injection ring, which completely fills the adhesive injection interval.

2. The assembly method of the battery top cover assembly as described in claim 1, characterized in that, The upper fixing member is positioned and installed on the upper surface of the top cover plate by the upper positioning ring. The outer periphery of the upper fixing member extends outward to form the upper positioning ring, which is arranged in a circumferential shape. The upper positioning ring has an upper annular surface that faces downward. In assembly step 1), the lower extension is inserted into the mounting hole from top to bottom until the upper annular surface presses against the upper surface of the top cover from top to bottom.

3. The assembly method of the battery top cover assembly as described in claim 2, characterized in that, The lower fixing member is positioned and installed on the lower surface of the top cover plate by a lower positioning ring. The outer periphery of the lower fixing member extends outward to form the lower positioning ring, which is arranged in a circumferential shape. The lower positioning ring has an upward-facing lower annular surface. In assembly step 1), the upper extension is inserted into the mounting hole from bottom to top until the lower annular surface presses against the lower surface of the top cover from bottom to top.

4. The assembly method of the battery top cover assembly as described in claim 3, characterized in that, The top of the upper fastener has an upper ring extending toward the mounting area, and the upper ring is arranged around the upper fastener along its surrounding direction. In assembly step 4), glue is injected into the glue injection interval until the glue injection ring completely fills the glue injection interval and covers the upper surface of the upper ring and the upper positioning ring, thus forming the glue injection ring.

5. The assembly method of the battery top cover assembly as described in claim 3, characterized in that, The lower surface of the top cover plate is provided with a downward protruding mounting ring, and the upper surface of the lower plastic part is provided with a mounting groove for the mounting ring to be installed. The mounting ring and the mounting groove cooperate to fix the lower plastic part and the top cover plate together. In assembly step 6), the upper surface of the lower plastic part is pressed against the lower surface of the top cover plate, the lower plastic part is elastically deformed until the mounting ring is embedded in the mounting groove, the lower plastic part is elastically reset, and the mounting ring and the mounting groove cooperate to fix the top cover plate and the lower plastic part together.

6. The assembly method of the battery top cover assembly as described in claim 5, characterized in that, Along the top-to-bottom direction, the upper end of the mounting ring is connected to the top cover plate, the lower part of the mounting ring is bent outwards and extended away from the blast hole, and the mounting groove is consistent with the outline of the mounting ring; Along the extending direction of the mounting ring, the mounting ring has a lower extension section extending longitudinally downward, the lower extension section being arranged around the blast hole; the end of the lower extension section bends outward away from the blast hole to form a bent section, the bent section being arranged around the blast hole; the end of the bent section extends upward at an angle away from the blast hole to form an inclined section; under the action of the lower extension section, the bent section and the inclined section, the lower plastic part is fixedly hung below the top cover plate; In assembly step 6), the upper surface of the lower plastic part is pressed against the lower surface of the top cover plate, the lower plastic part is elastically deformed, the bent section, the inclined section and the lower extension section are sequentially inserted into the mounting groove, the lower plastic part is elastically reset, the mounting ring cooperates with the mounting groove, and the top cover plate is fixedly connected to the lower plastic part.

7. The assembly method of the battery top cover assembly as described in claim 6, characterized in that, The lower fixing member has a circumferentially arranged outer peripheral surface, and an outer peripheral ring is formed on the outer peripheral surface that protrudes outward from the pole post. The outer peripheral ring is arranged circumferentially along the circumferential direction of the outer peripheral surface. The lower plastic part has a covering section covering the outer surface of the lower positioning ring and the outer surface of the lower ring. The covering section has an inwardly recessed embedding groove that is fitted to the outer circumferential ring. In assembly step 6), the outer circumferential ring is embedded into the embedding groove. Under the cooperation of the outer circumferential ring and the embedding groove, the fixing member and the lower plastic part are relatively fixed.

8. The assembly method of the battery top cover assembly as described in any one of claims 2 to 7, characterized in that, The upper annular surface is provided with a downward protruding limiting ring, which is arranged around the upper annular surface. The upper surface of the top cover is provided with a downward recessed limiting groove, which is arranged in a circumferential shape. The limiting ring cooperates with the limiting groove. In assembly step 1), the lower extension is inserted into the mounting hole from top to bottom, and the limiting ring is embedded into the limiting groove from top to bottom until the upper annular surface presses against the upper surface of the top cover plate.

9. The assembly method of the battery top cover assembly as described in claim 8, characterized in that, The upper annular surface is provided with an upwardly recessed sealing groove, which is arranged around the upper annular surface in the circumferential direction. The sealing groove is spaced apart from the limiting ring, and the sealing groove is arranged between the limiting ring and the lower extension. An elastic water-stop layer is fixed on the bottom of the sealing groove. In the natural state, the bottom of the water-stop layer is exposed below the upper annular surface. In assembly step 1), the lower extension is inserted into the mounting hole from top to bottom, and the water-stop layer is pressed against the upper surface of the top cover plate. Under the action of gravity, the water-stop layer is compressed and deformed until the bottom of the water-stop layer is flush with the opening of the sealing groove.

Images