Method for assembling a battery cover plate

Abstract

The application relates to the technical field of a battery cover plate and discloses an assembling method of the battery cover plate, which comprises the following assembling steps: 1) a top cover sheet is provided with a pole hole and a flange wall, and a surrounding area is provided with an annular plate to form the pole hole; 2) the top cover sheet is welded with an explosion-proof sheet; 3) a pole is provided with an outer circumferential ring, and a plastic embedding ring is formed by injection molding on the outer circumferential ring; the pole has an upper section and a lower section; 4) a sealing ring is placed on the annular plate; 5) the lower section extends to below the top cover sheet, and the upper section extends to above the surrounding area; 6) the upper part of the flange wall forms a bending section and is pressed on the plastic embedding ring; 7) an upper plastic ring is formed by injection molding on the top cover sheet, and the pole is fixedly connected with the top cover sheet; 8) a lower plastic part is installed at the bottom of the top cover sheet, and the lower plastic part is fixedly connected with the top cover sheet; through cooperation of the bending section and the plastic embedding ring, the sealing effect is enhanced; and through injection molding of the upper plastic ring, the pole is firmly connected with the top cover sheet.

Description

Technical Field

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

[0002] With the development of technology, batteries have been applied to all aspects of our lives. In the development of modern high-performance batteries, the sealing performance of the battery cover has always been one of the key factors affecting the overall performance and safety of the battery.

[0003] Currently, the requirements for sealing performance of battery covers during assembly are becoming increasingly stringent. However, in existing technologies, on the one hand, traditional sealing rings have simple structures and lack targeted structural designs, making it difficult to achieve precise longitudinal compression and lateral expansion deformation during assembly. This results in unsatisfactory sealing effects and makes the battery prone to sealing failures such as electrolyte leakage during operation, affecting battery life and performance.

[0004] On the other hand, existing assembly methods fail to achieve an organic combination of pole fixing and sealing operations. Typically, the pole is fixed first, and then the sealing is handled separately, lacking synergy. This makes the battery cover prone to loosening during long-term use due to the unstable connection between the pole and the top cover, which in turn leads to sealing failure and fails to meet the market demand for high-performance battery covers. Summary of the Invention

[0005] The purpose of this invention is to provide a method for assembling a battery cover, which aims to solve the problem of poor sealing performance during battery cover assembly in the prior art.

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

[0007] 1) A molded top cover sheet, wherein the top cover sheet has a through pole hole extending vertically, and the top of the top cover sheet has a flanged wall arranged around the pole hole in the circumference; the flanged wall encloses to form an enclosed area, the enclosed area is located above the pole hole, and the bottom of the enclosed area has an annular plate, the annular plate enclosing to form the pole hole.

[0008] 2) Weld explosion-proof sheets onto the top cover plate;

[0009] 3) Provide an electrode post, wherein an outer peripheral ring is protruding from the outer periphery of the electrode post, the outer peripheral ring is arranged around the outer periphery of the electrode post, and a plastic insert ring is injection molded on the outer peripheral ring; the electrode post has an upper section located above the outer peripheral ring and a lower section located below the outer peripheral ring;

[0010] 4) Place a sealing ring on the annular plate;

[0011] 5) The lower section of the pole is passed through the pole hole, the lower section extends to the bottom of the top cover plate, the outer circumference is pressed against the sealing ring, and the upper section passes through the enclosing area and extends to the top of the enclosing area;

[0012] 6) The upper part of the flanged wall is bent toward the enclosing area to form a bent section. The bent section presses against the plastic insert ring so that the outer peripheral ring is longitudinally compressed and deformed against the sealing ring. The sealing ring seals the outer peripheral ring and the annular plate.

[0013] 7) An upper plastic ring is injection molded on the top cover plate. The upper plastic ring is arranged around the circumference of the flange wall. The upper plastic ring wraps around the outer periphery of the flange wall and the outer periphery of the upper section, thus fixing the pole post to the top cover plate.

[0014] 8) Install the lower plastic part at the bottom of the top cover plate and fix the lower plastic part to the top cover plate;

[0015] In assembly step 3), the sealing ring has two annularly arranged spring rings inside, which are arranged around the circumference of the sealing ring and are spaced vertically apart, with a compression gap between them; in assembly step 6), the bent section presses against the plastic insert ring, and during the longitudinal compression of the sealing ring, the two spring rings move towards each other to reduce the compression gap. The inner side of the sealing ring expands laterally toward the outer periphery of the lower section, and the outer side of the sealing ring expands laterally toward the inner wall of the enclosed area.

[0016] Furthermore, in assembly step 1), the top cover is integrally stamped and formed, and the top cover has explosion-proof holes arranged vertically through it. In assembly step 2), the explosion-proof sheet is sealed in the explosion-proof holes.

[0017] Furthermore, in the assembly step 3), the plastic insert ring is arranged in a curved manner, having a horizontal section and a longitudinal section. The longitudinal section wraps around the outer periphery of the outer ring, and the horizontal section abuts against the top of the outer ring.

[0018] In assembly step 6), the curved section presses against the horizontal section, and the longitudinal section abuts against the inner wall of the enclosed area.

[0019] Furthermore, in the assembly step 6), the longitudinal section presses against the sealing ring, and simultaneously presses against the sealing ring with the outer circumferential ring, so as to compress and deform the sealing ring longitudinally.

[0020] Furthermore, in assembly step 6), there is an end gap between the end of the upper section and the end of the curved section. In assembly step 7), the upper plastic ring includes an outer ring section and an inner ring section. The outer ring section wraps around the outer periphery of the flange wall, and the inner ring section is embedded in the end gap. The outer ring section wraps around the curved section, and the inner ring section wraps around the outer periphery of the upper section.

[0021] Furthermore, in assembly step 6), after the upper part of the flange wall is bent to form a bent section, a bent position is formed in the middle of the flange wall, the outer side of the plastic insert ring is arranged towards the bent position, and there is a bent interval between the insert ring and the bent position; in assembly step 7), the inner ring section extends into the bent interval and fills the bent interval.

[0022] Furthermore, in assembly step 3), the plastic insert ring is provided with multiple notch areas, and the multiple notch areas are arranged around the plastic insert ring at circumferential intervals; in assembly step 6), when the bent section presses against the plastic insert ring, the bent interval is connected to the end interval through the notch area; in assembly step 7), the inner ring section extends through the notch area into the bent interval, filling the bent interval and the notch area.

[0023] Furthermore, in the assembly step 8), the lower plastic part is fixed to the bottom of the top cover plate by laser welding.

[0024] Furthermore, in the assembly step 3), along the width direction of the spring ring, the middle part of the spring ring protrudes outward from the compression interval to form a middle protruding section, and the two ends of the middle protruding section extend outward to form end horizontal sections.

[0025] In the assembly step 6), the sealing ring is longitudinally compressed, and during the process of the compression interval shrinking, the middle protruding sections of the two spring rings elastically deform towards each other, and the two end horizontal sections guide the sealing rings to expand laterally on both sides.

[0026] Furthermore, in the assembly step 3), the central protruding section is provided with a plurality of hollow grooves arranged in a strip shape and extending through the central protruding section from top to bottom. The plurality of hollow grooves are arranged at intervals around the circumference of the spring ring, and the hollow grooves are arranged in a curved manner along the width direction of the central protruding section.

[0027] In assembly step 6), during the elastic deformation of the central protruding section, multiple hollowed-out grooves undergo synchronous elastic deformation.

[0028] Compared with the prior art, the battery cover assembly method provided by the present invention has the following main technical advantages:

[0029] 1) The combination of the curved section of the flange wall and the plastic insert ring ensures that the outer circumferential ring is compressed and deformed longitudinally against the sealing ring. This not only enhances the sealing effect, but also firmly connects the pole and the top cover plate through the injection molding of the upper plastic ring. Furthermore, the upper plastic ring is arranged around the circumference of the flange wall, wrapping around the outer circumference of the flange wall and the upper section, further enhancing the stability during assembly.

[0030] 2) First, two spaced spring rings are set inside the sealing ring. When the pole is inserted into the pole hole and the bent section presses against the plastic insert ring, the sealing ring is driven to compress longitudinally. The spring rings move towards each other, causing the inner side of the sealing ring to fit tightly against the outer periphery of the lower part of the pole, and the outer side to fit tightly against the inner wall of the enclosed area, thereby achieving efficient sealing.

[0031] 3) The injection molding of the upper plastic ring and the lower plastic part not only improves the sealing performance of the entire assembly process, but also enhances the overall structural stability of the battery cover. This integrated process ensures that the connection between the terminal and the top cover will not loosen during long-term use of the battery, thereby effectively avoiding sealing failure. Attached Figure Description

[0032] Figure 1 This is a flowchart illustrating the assembly method of the battery cover provided by the present invention;

[0033] Figure 2 This is a schematic diagram showing the assembled state of the battery cover plate provided by the present invention;

[0034] Figure 3 This is an exploded view of the battery cover provided by the present invention;

[0035] Figure 4 This is a cross-sectional schematic diagram of the battery cover plate provided by the present invention;

[0036] Figure 5 This invention provides Figure 4 A magnified view of the area marked "A" in the middle;

[0037] Figure 6 This is a cross-sectional view of the sealing ring provided by the present invention;

[0038] Figure 7 This is a top view of the spring ring provided by the present invention;

[0039] In the diagram: top cover plate 100, explosion-proof hole 101, explosion-proof plate 102, upper plastic ring 103, inner ring section 104, lower plastic part 105;

[0040] Flanged wall 200, curved section 201, annular plate 202, sealing ring 203, spring ring 204, central protruding section 205, end horizontal section 206, hollow groove 207, extrusion interval 208.

[0041] 300 pole post, 301 pole post hole, 302 outer peripheral ring, 303 plastic insert ring, 304 bending interval, 305 notch area. Detailed Implementation

[0042] 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.

[0043] The implementation of the present invention will be described in detail below with reference to specific embodiments.

[0044] 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 accompanying 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 accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0045] Reference Figure 1-7 The image shows a preferred embodiment of the present invention.

[0046] The assembly method for the battery cover includes the following assembly steps:

[0047] 1) A top cover plate 100 is formed, and the top cover plate 100 has a through pole hole 301. The top of the top cover plate 100 has a flange wall 200, which is arranged around the pole hole 301 in the circumference. The flange wall 200 encloses and forms an enclosed area, which is located above the pole hole 301. The bottom of the enclosed area has an annular plate 202, which encloses and forms the pole hole 301.

[0048] 2) Weld explosion-proof sheet 102 onto top cover plate 100;

[0049] 3) Provide an electrode post 300, with an outer peripheral ring 302 protruding from the outer periphery of the electrode post 300. The outer peripheral ring 302 is arranged around the outer peripheral ring 302 of the electrode post 300, and a plastic insert ring 303 is injection molded on the outer peripheral ring 302. The electrode post 300 has an upper section located above the outer peripheral ring 302 and a lower section located below the outer peripheral ring 302.

[0050] 4) Place the sealing ring 203 on the annular plate 202;

[0051] 5) Pass the lower section of the pole post 300 through the pole post hole 301, and extend the lower section to the bottom of the top cover plate 100. The outer circumferential ring 302 presses against the sealing ring 203, and the upper section passes through the enclosing area and extends to the top of the enclosing area.

[0052] 6) The upper part of the flange wall 200 is bent toward the enclosed area to form a bent section 201. The bent section 201 presses against the plastic insert ring 303 so that the outer peripheral ring 302 presses against the sealing ring 203 and is longitudinally compressed and deformed. The sealing ring 203 seals the outer peripheral ring 302 and the annular plate 202.

[0053] 7) An upper plastic ring 103 is injection molded on the top cover plate 100. The upper plastic ring 103 is arranged around the circumference of the flange wall 200. The upper plastic ring 103 wraps around the outer periphery of the flange wall 200 and the outer periphery of the upper section, thus fixing the pole post 300 to the top cover plate 100.

[0054] 8) Install the lower plastic part 105 at the bottom of the top cover plate 100 and fix the lower plastic part 105 to the top cover plate 100.

[0055] In assembly step 3), the sealing ring 203 has two spring rings 204 arranged in a ring shape inside. The spring rings 204 are arranged around the circumference of the sealing ring 203 and are arranged vertically spaced. There is a compression gap 208 between the two spring rings 204. In assembly step 6), the bent section 201 presses against the plastic insert ring 303 and drives the sealing ring 203 to compress longitudinally. During this process, the two spring rings 204 move towards each other to reduce the compression gap 208. The inner side of the sealing ring 203 expands and deforms laterally towards the outer periphery of the lower section, and the outer side of the sealing ring 203 expands and deforms laterally towards the inner wall of the enclosing area.

[0056] The battery cover assembly method described above has the following main technical advantages:

[0057] 1) The cooperation between the curved section 201 of the flange wall 200 and the plastic insert ring 303 ensures that the outer peripheral ring 302 presses against the sealing ring 203 in a longitudinal compression deformation. This not only enhances the sealing effect, but also firmly connects the pole post 300 and the top cover plate 100 through the injection molding of the upper plastic ring 103. Furthermore, the upper plastic ring 103 is arranged around the circumference of the flange wall 200, wrapping around the outer periphery of the flange wall 200 and the upper section, further enhancing the stability during assembly.

[0058] 2) First, two spaced spring rings 204 are set inside the sealing ring 203. When the pole post 300 is inserted into the pole post hole 301 and the bent section 201 presses against the plastic insert ring 303, the sealing ring 203 is driven to compress longitudinally, and the spring rings 204 move towards each other, so that the inner side of the sealing ring 203 is tightly attached to the outer periphery of the lower section of the pole post 300, and the outer side is tightly attached to the inner wall of the enclosing area, thereby achieving efficient sealing.

[0059] 3) Through the injection molding of the upper plastic ring 103 and the lower plastic part 105, the entire assembly process not only improves the sealing performance, but also enhances the overall structural stability of the battery cover. This integrated process ensures that the connection between the terminal post 300 and the top cover 100 will not loosen during long-term use of the battery, thereby effectively avoiding sealing failure.

[0060] The terminal 300 mentioned in this embodiment has a positive terminal and a negative terminal. The positive terminal is conductive to the top cover plate, while the negative terminal is insulated from the top cover plate 100.

[0061] In this embodiment, in assembly step 1), the top cover plate 100 is stamped and integrally formed, and the top cover plate 100 has explosion-proof holes 101 arranged vertically. In assembly step 2), the explosion-proof sheet 102 covers the explosion-proof holes 101.

[0062] The explosion-proof hole 101 can automatically release pressure when the internal pressure of the battery is abnormal, preventing the battery cover from cracking or exploding due to excessive pressure, effectively protecting the safety of the battery and the user.

[0063] For example, during rapid charging and discharging of the battery, the internal gas pressure may rise sharply. The explosion-proof hole 101 can release pressure in time to prevent the cover from breaking. At the same time, the explosion-proof sheet 102 ensures the sealing of the battery under normal operating conditions, further improving the safety and reliability of the battery cover.

[0064] In this embodiment, in assembly step 3), the plastic insert ring 303 is arranged in a curved manner, having a horizontal section and a longitudinal section. The longitudinal section wraps around the outer periphery of the outer peripheral ring 302, and the horizontal section abuts against the top of the outer peripheral ring 302.

[0065] In assembly step 6), the curved section 201 presses against the horizontal section, and the longitudinal section abuts against the inner wall of the enclosed area.

[0066] The plastic insert ring 303 includes a horizontal section and a longitudinal section arranged in a curved manner, providing precise support and positioning for the sealing ring 203. During assembly, the curved section 201 presses against the horizontal section, and the longitudinal section abuts against the inner wall of the enclosed area, ensuring that the sealing ring 203 will not shift or deform when the pole post 300 is inserted, thus improving the stability of the sealing ring 203 and ensuring that it can be evenly stressed during assembly, thereby achieving a better sealing effect.

[0067] In this embodiment, during assembly step 6), the longitudinal section presses against the sealing ring 203, and simultaneously presses against the sealing ring 203 with the outer circumferential ring 302, so as to compress and deform the sealing ring 203 longitudinally.

[0068] When the pole post 300 is inserted into the pole post hole 301, the outer peripheral ring 302 and the longitudinal section simultaneously apply pressure to the sealing ring 203, causing the sealing ring 203 to undergo longitudinal compression deformation. This dual pressure mechanism ensures that the sealing ring 203 can tightly fit the pole post 300 and the top cover plate 100, forming a good sealing effect.

[0069] In this way, even if the battery experiences temperature changes or vibrations during use, the tight fit of the sealing ring 203 can be maintained for a long time after the battery cover is assembled, ensuring the sealing performance of the battery cover.

[0070] In this embodiment, in assembly step 6), there is an end gap between the end of the upper section and the end of the curved section 201. In assembly step 7), the upper plastic ring 103 includes an outer ring section and an inner ring section 104. The outer ring section wraps around the outer periphery of the flange wall 200, and the inner ring section 104 is embedded in the end gap. The outer ring section wraps around the curved section 201, and the inner ring section 104 wraps around the outer periphery of the upper section.

[0071] The double wrapping of the outer ring section and the inner ring section 104 enhances the connection strength between the terminal post 300 and the top cover plate 100, which not only fixes the position of the bent section 201 and the upper section, but also further enhances the stability of the assembly. After the battery cover is assembled, even if the battery is subjected to certain vibration and impact during use, the double wrapping of the upper plastic ring 103 can still ensure that the connection between the terminal post 300 and the top cover plate 100 will not loosen, thereby improving the overall reliability of the battery cover.

[0072] In this embodiment, in assembly step 6), after the upper part of the flange wall 200 is bent to form a bent section 201, a bent position is formed in the middle part of the flange wall 200, the outer side of the plastic insert ring 303 is arranged towards the bent position, and there is a bent interval 304 between it and the bent position; in assembly step 7), the inner ring section 104 extends into the bent interval 304, filling the bent interval 304.

[0073] This allows the inner ring segment 104 to precisely fill the bending interval 304, further enhancing the connection strength between the pole post 300 and the top cover plate 100, while ensuring the stability and sealing effect of the sealing ring 203.

[0074] In this embodiment, in assembly step 3), the plastic insert ring 303 is provided with multiple notch areas 305, and the multiple notch areas 305 are arranged around the plastic insert ring 303 at circumferential intervals; in assembly step 6), when the bent segment 201 presses against the plastic insert ring 303, the bent interval 304 is connected to the end spacer through the notch area 305; in assembly step 7), the inner ring segment 104 extends through the notch area 305 into the bent interval 304, filling the bent interval 304 and the notch area 305.

[0075] This connection through the notch area 305 allows the inner ring section 104 to extend smoothly into the bending interval 304, further enhancing the connection strength between the pole post 300 and the top cover plate 100, while ensuring the stability and sealing effect of the sealing ring 203. Furthermore, the notch area 305 is arranged circumferentially to ensure that the inner ring section 104 can distribute stress evenly during the extension process, avoiding local stress concentration.

[0076] In this embodiment, in assembly step 8), the lower plastic part 105 is fixed to the bottom of the top cover plate 100 by laser welding; wherein, the lower plastic part 105 can prevent the cover plate from loosening due to vibration or impact during battery use, and also enhances the sealing performance of the battery cover plate.

[0077] Laser welding has advantages such as fast welding speed, small heat-affected zone and high welding quality, which can ensure a firm connection between the lower plastic part 105 and the top cover plate 100, and can still have reliability and safety even under complex working conditions.

[0078] In this embodiment, in assembly step 3), along the width direction of the spring ring 204, the middle part of the spring ring 204 protrudes outward from the compression interval 208 and bends to form a middle protruding section 205. The two ends of the middle protruding section 205 extend outward to form an end horizontal section 206.

[0079] In assembly step 6), the sealing ring 203 is longitudinally compressed, and during the process of the compression interval 208 shrinking, the middle protruding section 205 of the two spring rings 204 elastically deforms towards each other, and the two end horizontal sections 206 guide the sealing ring 203 to expand laterally on both sides.

[0080] When the sealing ring 203 is longitudinally compressed, the protruding sections 205 in the middle of the two spring rings 204 elastically deform towards each other, while the horizontal sections 206 at the ends guide the sealing ring 203 to expand laterally on both sides. This allows the sealing ring 203 to fit tightly against the pole post 300 and the top cover plate 100, forming a good sealing effect. Moreover, the elastic deformation of the spring rings 204 can adapt to different assembly conditions, ensuring that the sealing ring 203 can maintain good sealing performance under various working conditions.

[0081] In this embodiment, during assembly step 3), the central protruding section 205 is provided with multiple hollowed-out grooves 207 arranged in a strip shape and extending vertically through the central protruding section 205. The multiple hollowed-out grooves 207 are arranged around the circumferential space of the spring ring 204 at intervals, and the hollowed-out grooves 207 are arranged in a curved manner along the width direction of the central protruding section 205. This allows the central protruding section 205 to adapt more flexibly to different pressure conditions during elastic deformation.

[0082] In assembly step 6), during the elastic deformation of the central protruding section 205, multiple hollow grooves 207 undergo synchronous elastic deformation. This allows the central protruding section 205 to achieve better flexibility and adaptability during elastic deformation through the synchronous elastic deformation of the hollow grooves 207, further improving the sealing effect of the sealing ring 203.

[0083] 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 cover, characterized in that, The assembly process includes the following steps: 1) A molded top cover sheet, wherein the top cover sheet has a through pole hole extending vertically, and the top of the top cover sheet has a flanged wall arranged around the pole hole in the circumference; the flanged wall encloses to form an enclosed area, the enclosed area is located above the pole hole, and the bottom of the enclosed area has an annular plate, the annular plate enclosing to form the pole hole. 2) Weld explosion-proof sheets onto the top cover plate; 3) Provide an electrode post, wherein an outer peripheral ring is protruding from the outer periphery of the electrode post, the outer peripheral ring is arranged around the outer periphery of the electrode post, and a plastic insert ring is injection molded on the outer peripheral ring; the electrode post has an upper section located above the outer peripheral ring and a lower section located below the outer peripheral ring; 4) Place a sealing ring on the annular plate; 5) The lower section of the pole is passed through the pole hole, the lower section extends to the bottom of the top cover plate, the outer circumference is pressed against the sealing ring, and the upper section passes through the enclosing area and extends to the top of the enclosing area; 6) The upper part of the flanged wall is bent toward the enclosing area to form a bent section. The bent section presses against the plastic insert ring so that the outer peripheral ring is longitudinally compressed and deformed against the sealing ring. The sealing ring seals the outer peripheral ring and the annular plate. 7) An upper plastic ring is injection molded on the top cover plate. The upper plastic ring is arranged around the circumference of the flange wall. The upper plastic ring wraps around the outer periphery of the flange wall and the outer periphery of the upper section, thus fixing the pole post to the top cover plate. 8) Install the lower plastic part at the bottom of the top cover plate and fix the lower plastic part to the top cover plate; In assembly step 3), the sealing ring has two annularly arranged spring rings inside, which are arranged around the circumference of the sealing ring and are spaced vertically apart, with a compression gap between them; in assembly step 6), the bent section presses against the plastic insert ring, and during the longitudinal compression of the sealing ring, the two spring rings move towards each other to reduce the compression gap. The inner side of the sealing ring expands laterally toward the outer periphery of the lower section, and the outer side of the sealing ring expands laterally toward the inner wall of the enclosed area.

2. The assembly method of the battery cover as described in claim 1, characterized in that, In assembly step 1), the top cover is integrally formed by stamping, and the top cover has explosion-proof holes arranged vertically. In assembly step 2), the explosion-proof sheet is sealed in the explosion-proof holes.

3. The assembly method of the battery cover as described in claim 1, characterized in that, In the assembly step 3), the plastic insert ring is arranged in a curved manner, having a horizontal section and a longitudinal section. The longitudinal section wraps around the outer periphery of the outer ring, and the horizontal section abuts against the top of the outer ring. In assembly step 6), the curved section presses against the horizontal section, and the longitudinal section abuts against the inner wall of the enclosed area.

4. The assembly method of the battery cover as described in claim 3, characterized in that, In assembly step 6), the longitudinal section presses against the sealing ring, and simultaneously presses against the sealing ring with the outer circumferential ring, so as to compress and deform the sealing ring longitudinally.

5. The assembly method of the battery cover plate as described in any one of claims 1-4, characterized in that, In assembly step 6), there is an end gap between the end of the upper section and the end of the curved section. In assembly step 7), the upper plastic ring includes an outer ring section and an inner ring section. The outer ring section wraps around the outer periphery of the flange wall, and the inner ring section is embedded in the end gap. The outer ring section wraps around the curved section, and the inner ring section wraps around the outer periphery of the upper section.

6. The assembly method of the battery cover as described in claim 5, characterized in that, In assembly step 6), after the upper part of the flange wall is bent to form a curved section, a curved position is formed in the middle of the flange wall, and the outer side of the plastic insert ring is arranged towards the curved position and there is a curved interval between it and the curved position; in assembly step 7), the inner ring section extends into the curved interval and fills the curved interval.

7. The assembly method of the battery cover as described in claim 6, characterized in that, In assembly step 3), the plastic insert ring is provided with multiple notch areas, and the multiple notch areas are arranged around the plastic insert ring at circumferential intervals; in assembly step 6), when the bent section presses against the plastic insert ring, the bent interval is connected to the end interval through the notch area; in assembly step 7), the inner ring section extends through the notch area into the bent interval, filling the bent interval and the notch area.

8. The assembly method of the battery cover plate according to any one of claims 1-4, characterized in that, In assembly step 8), the lower plastic part is fixed to the bottom of the top cover plate by laser welding.

9. The assembly method of the battery cover plate according to any one of claims 1-4, characterized in that, In assembly step 3), along the width direction of the spring ring, the middle part of the spring ring protrudes outward from the compression interval to form a middle protruding section, and the two ends of the middle protruding section extend outward to form end horizontal sections. In the assembly step 6), the sealing ring is longitudinally compressed, and during the process of the compression interval shrinking, the middle protruding sections of the two spring rings elastically deform towards each other, and the two end horizontal sections guide the sealing rings to expand laterally on both sides.

10. The assembly method of the battery cover as described in claim 9, characterized in that, In the assembly step 3), the central protruding section is provided with a plurality of strip-shaped hollow grooves that run vertically through the central protruding section. The plurality of hollow grooves are arranged at intervals around the circumference of the spring ring, and the hollow grooves are arranged in a curved manner along the width direction of the central protruding section. In assembly step 6), during the elastic deformation of the central protruding section, multiple hollowed-out grooves undergo synchronous elastic deformation.

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