Battery cover plate manufacturing method

Abstract

This invention relates to the technical field of battery cover plates and discloses a method for preparing a battery cover plate, including the following preparation steps: 1) stamping to form a top cover plate with terminal hole, explosion-proof hole and liquid injection hole; a surrounding ring is formed on the top of the top cover plate, and an annular platform is formed at the bottom of the terminal hole; 2) covering the explosion-proof hole with an explosion-proof valve; 3) providing a terminal including a lower section and an upper section, and injection molding an outer plastic ring on the outer periphery of the lower section; 4) placing a sealing ring on the annular platform and placing the terminal in the terminal hole; 5) forming a bent ring on the upper part of the surrounding ring and a longitudinal ring on the lower part; 6) forming an upper plastic ring on the top cover plate; 7) installing a lower plastic plate on the bottom of the top cover plate and attaching a film layer to the explosion-proof valve; in preparation step 5), a concave-convex locking structure is formed between the bottom of the sealing ring and the top of the annular platform; since the surrounding ring and the annular platform are formed in the same stamping process as the top cover plate, the preparation cost of the battery cover plate is reduced.

Description

Technical Field

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

[0002] As an important component of the battery, the battery cover plays multiple roles, including sealing and safety protection. The manufacturing process of the cover involves multiple steps such as stamping, injection molding, and riveting. The cover is assembled from multiple parts such as terminals, sealing rings, and explosion-proof valves. Due to the large number of parts and the long assembly process, the manufacturing cost of the cover accounts for a relatively high proportion of the battery casing cost.

[0003] In the fabrication of existing battery cover plates, the surrounding ring and annular platform around the terminal hole are key structures for the compression and positioning of the sealing ring.

[0004] However, in the existing technology, the surrounding ring and the annular platform are not formed in the same stamping process as the cover plate. After the cover plate is formed by stamping, the surrounding ring and the annular platform need to be formed or assembled separately through an additional process. Each additional forming or assembly process corresponds to an additional equipment occupation and manual operation, which increases the preparation time and equipment cost of the cover plate, resulting in a high preparation cost of the battery cover plate. Summary of the Invention

[0005] The purpose of this invention is to provide a method for preparing a battery cover, which aims to solve the problem of high manufacturing cost of battery cover in the prior art.

[0006] This invention is achieved through a battery cover preparation method, comprising the following preparation steps: 1) A top cover plate is formed by stamping. The top cover plate is provided with two vertically through pole holes, an explosion-proof hole and a liquid injection hole. A surrounding ring is formed on the top of the top cover plate. The surrounding ring is arranged around the pole holes in the circumference. A ring platform is formed at the bottom of the pole holes. 2) Cover the explosion-proof hole with an explosion-proof valve and weld the explosion-proof valve to the top cover plate; 3) Provide an electrode post, the electrode post including a lower section and an upper section formed on the lower section, the diameter of the lower section being larger than the diameter of the upper section, an outer plastic ring being injection molded on the outer periphery of the lower section, the outer plastic ring being arranged around the lower section in a circumferential direction; the outer plastic ring including an outer peripheral section formed on the outer periphery of the lower section and a top section formed on the top of the lower section, the top section and the outer peripheral section being bent to form a bent section; 4) Place a sealing ring on the annular platform, place the pole post in the pole post hole, press the bottom of the lower section against the sealing ring, and there is an outer peripheral gap between the outer peripheral section and the surrounding ring; 5) The upper part of the surrounding ring is riveted and bent downwards to form a bent ring. The bent ring is pressed against the top section, and a downward pressing pressure is applied to the top section so that the sealing ring is in an elastic compression deformation state. The lower part of the surrounding ring forms a longitudinally arranged longitudinal ring, the outer peripheral gap is formed between the longitudinal ring and the outer peripheral segment, and a bending interval is formed between the bending ring and the upper segment, the bending interval being arranged around the upper segment circumferentially. 6) An upper plastic ring is injection molded on the top cover sheet. The upper plastic ring has an inner section and an outer section. The inner section is embedded in the bending interval and fills the bending interval. The outer section covers the outer periphery of the surrounding ring, and the inner section and the outer section are integrally formed. 7) Install a plastic plate at the bottom of the top cover plate and attach a film layer to the explosion-proof valve; In the preparation step 5), after the sealing ring is compressed and deformed, a transversely fixed concave-convex locking structure is formed between the bottom of the sealing ring and the top of the annular platform. The concave-convex locking structure is arranged in a ring along the circumference of the pole post. During the process of elastic compression and deformation of the sealing ring, the concave-convex locking structure is simultaneously squeezed longitudinally, while the concave-convex locking structure remains laterally fixed, and the bottom of the sealing ring extends laterally elastically away from the concave-convex locking structure.

[0007] Furthermore, in preparation step 1), the top of the annular platform is recessed downwards to form a recessed retaining ring groove, which is arranged around the annular platform circumferentially; in preparation step 5), when the sealing ring is elastically compressed and deformed, the bottom of the sealing ring is embedded in the retaining ring groove to form a protrusion, which fills the retaining ring groove to form the concave-convex retaining structure.

[0008] Furthermore, in the preparation step 4), a rigid positioning ring is built into the sealing ring, and when the sealing ring is placed on the annular platform, the sealing ring is located above the retaining ring groove; In step 5 of the preparation process, after the sealing ring is compressed and elastically deformed, the positioning ring is embedded downward in the retaining ring groove so that the concave-convex retaining structure is laterally fixed and the positioning ring is wrapped in the protrusion.

[0009] Furthermore, in the preparation step 1), the top of the retaining ring groove is open to form a top opening, and the two sides of the top opening are respectively formed with bent top edges, and the two top edges are nested at intervals; in the preparation step 4), the bottom of the sealing ring is provided with two bottom ring grooves that are embedded at intervals, and the positioning ring is located between the two bottom ring grooves and is arranged at intervals with the two bottom ring grooves. In the preparation step 5), after the bottom of the sealing ring is embedded in the retaining ring groove to form a protrusion, the protrusion passes through the top opening and fills the retaining ring groove. The two top edges are embedded in the two bottom ring grooves so that the concave-convex retaining structure is fixed laterally.

[0010] Furthermore, in the preparation step 3), the top of the lower section is provided with a plurality of recessed internal notches, and the plurality of internal notches are arranged around the lower section at intervals along the circumference; after an outer plastic ring is formed on the outer periphery of the lower section, the top section is embedded to fill the internal notches, so that the outer plastic ring and the lower section are engaged and connected as one unit.

[0011] Furthermore, in the preparation step 3), the top segment is provided with multiple external notches, and the multiple external notches are arranged around the top segment at circumferential intervals. The external notches extend downward, pass through the bent segment, and extend to the outer peripheral segment. The outer peripheral gap communicates with the external notches. In the preparation step 6), after the upper plastic ring is formed by injection molding on the top cover sheet, the inner segment passes through the outer notch and extends into the outer peripheral gap, and the inner segment fills the outer notch.

[0012] Furthermore, in the preparation step 3), the top segment is provided with a plurality of external protrusions, which are arranged around the top segment at intervals in the circumferential direction; in the preparation step 5), after the upper part of the surrounding ring is riveted and bent downward to form a bent ring, the bent ring presses against the external protrusions so that the top of the bent segment and the external notch are arranged at intervals, and a top gap is formed between the bent segment and the top segment, which is arranged around the top segment at intervals in the circumferential direction. In step 6), after the upper plastic ring is formed by injection molding on the top cover sheet, the inner section passes through the top gap and fills the top gap.

[0013] Furthermore, in the preparation step 1), the annular platform is provided with a downwardly recessed stepped ring, which is arranged around the circumference of the annular platform; in the preparation step 7), the lower plastic plate is provided with a raised ring, which encloses to form a hollow area; the top of the raised ring is provided with an outwardly extending buckle ring, which is arranged around the circumference of the raised ring. The protruding ring is inserted into the electrode hole from bottom to top and is positioned below the electrode. The bottom of the electrode is exposed through the hollow area. The snap ring is embedded in the stepped ring and snapped together with the annular platform to fix the lower plastic plate to the bottom of the top cover.

[0014] Furthermore, in the preparation step 4), along the direction from bottom to top of the sealing ring, the sealing ring includes a bottom layer and a top layer covering the bottom layer. Along the direction from inside to outside of the bottom layer, the top of the bottom layer is arranged obliquely from bottom to top, and the bottom of the top layer covers and presses against the top of the bottom layer. A middle soft rubber strip is provided between the bottom of the top layer and the top of the bottom layer. The middle soft rubber strip is arranged in a ring along the circumference of the bottom layer. The middle soft rubber strip is connected to both the bottom layer and the top layer, so that the top layer and the bottom layer are connected as one unit. An outer ring is formed on the outer side of the top layer, the outer ring is covered with an outer soft rubber layer, the outer soft rubber layer extends downward and connects with the outer periphery of the bottom layer, so that the outer side of the top layer and the outer side of the bottom layer are connected as one; In step 5 of the preparation process, after the bending section applies downward pressure to the top section, the bottom layer and the top layer are elastically compressed and deformed respectively. The outer peripheral soft rubber layer is squeezed from bottom to top into the outer peripheral gap and fills the outer peripheral gap. During the elastic compression deformation of the top layer, the top layer is fixed in the middle soft rubber strip and undergoes lateral elastic compression deformation relative to the bottom layer. The top guide of the bottom layer extends upward in an inclined direction.

[0015] Furthermore, in the preparation step 4), an inner ring is formed on the inner side of the top layer, and the inner ring is covered with a rigid inner ring plate, while the inner side of the bottom layer is left empty and freely arranged; in the preparation step 5), during the elastic compression deformation of the bottom layer and the top layer respectively, the inner ring is in a laterally fixed state due to the restriction of the inner ring plate, so that the top layer is compressed and elastically deformed towards the outside.

[0016] Compared with the prior art, the battery cover preparation method provided by the present invention has the following advantages: 1) Since the surrounding ring and annular platform are formed in the same stamping process as the top cover, no additional process is required for separate forming or assembly, which reduces the stamping and assembly processes and thus lowers the manufacturing cost of the battery cover.

[0017] 2) The transversely fixed concave-convex locking structure ensures that the sealing ring remains transversely fixed during longitudinal compression, restricting lateral slippage and ensuring complete filling of the gap between the pole post and the pole post hole.

[0018] In addition, the bottom of the sealing ring extends laterally elastically away from the concave-convex locking structure, allowing the sealing ring to expand outward laterally, increasing the sealing contact area.

[0019] 3) Since the bending ring is formed by riveting and bending, it has a tendency to elastically rebound. Therefore, the outer section of the covering restricts the loosening of the bending ring under the elastic rebound tendency, so that the pressure of the bending ring on the sealing ring is maintained and the compression state of the sealing ring is stabilized. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the battery cover preparation method provided by the present invention; Figure 2 This is a three-dimensional schematic diagram of the top cover sheet provided by the present invention; Figure 3 This is a cross-sectional schematic diagram of the surrounding ring provided by the present invention; Figure 4 This is a cross-sectional schematic diagram of the surrounding ring provided by the present invention after being riveted and bent; Figure 5 This is a cross-sectional schematic diagram of the injection-molded upper plastic ring provided by the present invention; Figure 6 This is a three-dimensional schematic diagram of the lower plastic plate provided by the present invention; Figure 7 This is a three-dimensional schematic diagram of the outer plastic ring provided by the present invention; Figure 8 This is a three-dimensional schematic diagram of the pole provided by the present invention; Figure 9 This is a schematic diagram demonstrating the sealing ring compression ring platform provided by the present invention; Figure 10 This is a cross-sectional schematic diagram of the sealing ring provided by the present invention; In the diagram: top cover plate 100, pole hole 101, explosion-proof hole 102, liquid injection hole 103, lower plastic plate 104, raised ring 105, buckle ring 106, hollow area 107; Enclosing ring 200, bending ring 201, longitudinal ring 202, bending interval 203, inner section 204, outer section 205; Circular platform 300, retaining ring groove 301, top edge 302, stepped ring 303; 400 pole post, 401 lower section, 402 upper section, 403 internal notch, 404 outer plastic ring, 405 outer peripheral section, 406 top section, 407 bent section, 408 external notch, 409 external protrusion. Sealing ring 500, protrusion 501, positioning ring 502, bottom ring groove 503, bottom layer 504, top layer 505, middle soft rubber strip 506, outer ring 507, outer soft rubber layer 508, inner ring 509, inner ring piece 510. Detailed Implementation

[0021] 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.

[0022] The implementation of the present invention will be described in detail below with reference to specific embodiments.

[0023] 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.

[0024] Reference Figures 1-10 The image shows a preferred embodiment of the present invention.

[0025] A method for preparing a battery cover plate includes the following steps: 1) A top cover plate 100 is formed by stamping. The top cover plate 100 is provided with two vertically through pole post holes 101, an explosion-proof hole 102 and a liquid injection hole 103. A surrounding ring 200 is formed on the top of the top cover plate 100. The surrounding ring 200 is arranged around the pole post holes 101 in the circumference. An annular platform 300 is formed at the lower part of the pole post holes 101. 2) Cover the explosion-proof valve with the explosion-proof hole 102 and weld the explosion-proof valve to the top cover plate 100; 3) Provide an electrode post 400, which includes a lower section 401 and an upper section 402 formed on the lower section 401. The diameter of the lower section 401 is larger than the diameter of the upper section 402. An outer plastic ring 404 is injection molded on the outer periphery of the lower section 401. The outer plastic ring 404 is arranged around the lower section 401 in a circumferential direction. The outer plastic ring 404 includes an outer peripheral section 405 formed on the outer periphery of the lower section 401 and a top section 406 formed on the top of the lower section 401. The top section 406 and the outer peripheral section 405 are bent to form a bent section 407. 4) Place the sealing ring 500 on the annular platform 300, place the pole post 400 in the pole post hole 101, and press the bottom of the lower section 401 against the sealing ring 500. There is an outer peripheral gap between the outer peripheral section 405 and the surrounding ring 200. 5) Rivet and bend the upper part of the surrounding ring 200 downward to form a bent ring 201. The bent ring 201 presses against the top section 406 and applies downward pressing pressure to the top section 406 so that the sealing ring 500 is in an elastic compression deformation state. The lower part of the surrounding ring 200 forms a longitudinally arranged longitudinal ring 202, and an outer peripheral gap is formed between the longitudinal ring 202 and the outer peripheral segment 405. A bending interval 203 is formed between the bending ring 201 and the upper segment 402, and the bending interval 203 is arranged around the upper segment 402 in a circumferential direction. 6) An upper plastic ring is formed by injection molding on the top cover sheet 100. The upper plastic ring has an inner section 204 and an outer section 205. The inner section 204 is embedded in the bending interval 203 and fills the bending interval 203. The outer section 205 covers the outer periphery of the surrounding ring 200, and the inner section 204 and the outer section 205 are integrally formed. 7) Install the plastic sheet 104 at the bottom of the top cover 100 and attach a film layer to the explosion-proof valve; In preparation step 5), after the sealing ring 500 is compressed and deformed, a transversely fixed concave-convex locking structure is formed between the bottom of the sealing ring 500 and the top of the annular platform 300. The concave-convex locking structure is arranged in a ring along the circumference of the pole post 400. During the process of elastic compression and deformation of the sealing ring 500, the concave-convex locking structure is simultaneously squeezed longitudinally, while the concave-convex locking structure remains laterally fixed, and the bottom of the sealing ring 500 extends laterally elastically away from the concave-convex locking structure.

[0026] The battery cover preparation method provided above has the following advantages: 1) Since the surrounding ring 200 and the annular platform 300 are formed in the same stamping process as the top cover 100, no additional process is required for separate forming or assembly, which reduces the stamping and assembly processes and thus reduces the manufacturing cost of the battery cover.

[0027] 2) The transversely fixed concave-convex locking structure enables the sealing ring 500 to remain transversely fixed during longitudinal compression, restricting lateral sliding and ensuring that the gap between the pole post 400 and the pole post hole 101 is completely filled.

[0028] In addition, the bottom of the sealing ring 500 extends laterally elastically away from the concave-convex locking structure, allowing the sealing ring 500 to expand laterally outward, increasing the sealing contact area.

[0029] 3) Since the bending ring 201 is formed by riveting and bending, it has a tendency to elastically rebound. Therefore, the outer section 205 covers and restricts the loosening of the bending ring 201 under the elastic rebound tendency, so that the pressure of the bending ring 201 against the sealing ring 500 is maintained, and the compression state of the sealing ring 500 is stabilized.

[0030] As an extended embodiment, in preparation step 1), the top of the annular platform 300 is recessed downwards to form a recessed retaining ring groove 301, which is arranged around the circumference of the annular platform 300; in preparation step 5), when the sealing ring 500 is elastically compressed and deformed, the bottom of the sealing ring 500 is embedded in the retaining ring groove 301 to form a protrusion 501, which fills the retaining ring groove 301 to form a concave-convex retaining structure.

[0031] Since the protrusion 501 is constrained within the retaining ring groove 301, the bottom of the sealing ring 500 is limited laterally by the retaining ring groove 301, and therefore cannot slide laterally in all directions. The concave-convex locking structure remains laterally fixed during the longitudinal compression of the sealing ring 500, so that the gap between the pole post 400 and the pole post hole 101 is completely filled, thereby improving the sealing reliability of the battery cover.

[0032] As an extended embodiment, in preparation step 4), a rigid positioning ring 502 is built into the sealing ring 500. When the sealing ring 500 is placed on the annular platform 300, the sealing ring 500 is located above the retaining ring groove 301. In step 5), after the sealing ring 500 is compressed and elastically deformed, the positioning ring 502 is embedded downward in the retaining ring groove 301 so that the concave-convex retaining structure is horizontally fixed and the positioning ring 502 is wrapped in the protrusion 501.

[0033] When the positioning ring 502 is embedded in the retaining ring groove 301, since the positioning ring 502 is made of a hard material, its rigidity is higher than that of the elastic material of the sealing ring 500. Therefore, the positioning ring 502 can maintain its shape in the retaining ring groove 301 without lateral deformation, thereby providing internal support for the concave-convex retaining structure. The lateral fixed state of the concave-convex retaining structure is maintained by the rigidity of the positioning ring 502.

[0034] As an extended embodiment, in preparation step 1), the top of the retaining ring groove 301 is open to form a top opening, and the two sides of the top opening are respectively formed with bent top edges 302, and the two top edges 302 are nested at intervals; in preparation step 4), the bottom of the sealing ring 500 is provided with two bottom ring grooves 503 that are embedded at intervals, and the positioning ring 502 is located between the two bottom ring grooves 503 and is arranged at intervals with the two bottom ring grooves 503. In preparation step 5), after the bottom of the sealing ring 500 is embedded in the retaining ring groove 301 to form a protrusion 501, the protrusion 501 passes through the top opening and fills the retaining ring groove 301. The two top edges 302 are embedded in the two bottom ring grooves 503 so that the concave and convex retaining structure is fixed laterally.

[0035] The protrusion 501 fills the retaining ring groove 301 to form the first layer of lateral constraint, and the top edge 302 is embedded in the bottom ring groove 503 to form the second layer of lateral constraint. In this way, the concave and convex retaining structure maintains lateral fixation through double fitting, making the lateral positioning of the sealing ring 500 more reliable during longitudinal compression.

[0036] As an extended embodiment, in preparation step 3), the top of the lower segment 401 is provided with a plurality of recessed internal notches 403, which are arranged around the lower segment 401 at intervals in the circumference; after an outer plastic ring 404 is formed on the outer periphery of the lower segment 401, the top segment 406 is embedded and filled with the internal notches 403 so that the outer plastic ring 404 and the lower segment 401 are engaged and connected as one unit.

[0037] In this way, the circumferential position of the outer plastic ring 404 on the lower section 401 is limited by the internal notch 403, thereby preventing relative rotational displacement.

[0038] As an extended embodiment, in preparation step 3), the top segment 406 is provided with a plurality of external notches 408, the plurality of external notches 408 are arranged around the top segment 406 at circumferential intervals, the external notches 408 extend downward, pass through the bent segment 407, and extend to the outer peripheral segment 405, the outer peripheral gap is connected to the external notches 408. In step 6), after the upper plastic ring is formed by injection molding on the top cover plate 100, the inner section 204 passes through the outer notch 408 and extends into the outer peripheral gap, and the inner section 204 fills the outer notch 408.

[0039] In this way, the upper plastic ring and the outer plastic ring 404 are connected by filling the external notch 408, so that the two form a continuous integral injection molding structure inside the pole hole 101.

[0040] As an extended embodiment, in preparation step 3), a plurality of external protrusions 409 are provided on the top segment 406, and the plurality of external protrusions 409 are arranged around the top segment 406 at intervals in the circumferential direction; in preparation step 5), after the upper part of the surrounding ring 200 is riveted and bent downward to form a bent ring 201, the bent ring 201 presses against the external protrusions 409 so that the top of the bent segment 407 and the external notch 408 are arranged at intervals, and a top gap is formed between the bent segment 407 and the top segment 406, and the top gap is arranged around the top segment 406 at intervals in the circumferential direction; In step 6), after the upper plastic ring is formed by injection molding on the top cover plate 100, the inner section 204 passes through the top gap and fills the top gap.

[0041] In this way, the gap between the bending ring 201 and the top section 406 is filled, and the displacement of the bending ring 201 toward the top section 406 under the elastic rebound tendency is blocked by the inner section 204, maintaining the pressure of the bending ring 201 against the sealing ring 500, so that the compression state of the sealing ring 500 is stable.

[0042] As an extended embodiment, in preparation step 1), the annular platform 300 is provided with a downwardly recessed stepped ring 303, which is arranged around the circumference of the annular platform 300; in preparation step 7), the lower plastic plate 104 is provided with a protruding ring 105, which encloses and forms a hollow area 107; the top of the protruding ring 105 is provided with an outwardly extending buckle ring 106, which is arranged around the circumference of the protruding ring 105. The protruding ring 105 is inserted into the pole hole 101 from bottom to top and is positioned below the pole 400. The bottom of the pole 400 is exposed through the hollow area 107. The snap ring 106 is embedded in the stepped ring 303 and snapped together with the annular platform 300 so that the lower plastic plate 104 is fixed to the bottom of the top cover plate 100.

[0043] On the one hand, the hollow area 107 prevents the bottom of the pole post 400 from being obscured, and the state of the bottom of the pole post 400 can be observed through the hollow area 107.

[0044] On the other hand, the snap ring 106 is snapped into the step ring 303 so that the lower plastic plate 104 is fixed to the bottom of the top cover plate 100 by the snap engagement of the snap ring 106 and the step ring 303, thus eliminating the need for additional fasteners or adhesives.

[0045] As an extended embodiment, in preparation step 4), along the direction from bottom to top of the sealing ring 500, the sealing ring 500 includes a bottom layer 504 and a top layer 505 covering the bottom layer 504. Along the direction from inside to outside of the bottom layer 504, the top of the bottom layer 504 is arranged obliquely from bottom to top, and the bottom of the top layer 505 covers and presses against the top of the bottom layer 504. A middle soft rubber strip 506 is provided between the bottom of the top layer 505 and the top of the bottom layer 504. The middle soft rubber strip 506 is arranged in a ring along the circumference of the bottom layer 504. The middle soft rubber strip 506 is connected to the bottom layer 504 and the top layer 505 respectively, so that the top layer 505 and the bottom layer 504 are connected as one unit. An outer ring 507 is formed on the outer side of the top layer 505. The outer ring 507 is covered with an outer soft rubber layer 508. The outer soft rubber layer 508 extends downward and connects with the outer periphery of the bottom layer 504, so that the outer side of the top layer 505 and the outer side of the bottom layer 504 are connected as one. In preparation step 5), after the bending section 407 applies downward pressure to the top section 406, the bottom layer 504 and the top layer 505 are elastically compressed and deformed respectively. The outer soft rubber layer 508 is squeezed from bottom to top into the outer peripheral gap and fills the outer peripheral gap. During the elastic compression deformation of the top layer 505, the top layer 505 is fixed with the middle soft rubber strip 506 as the fixed position and undergoes transverse elastic compression deformation relative to the bottom layer 504. The top guide of the bottom layer 504 extends the top layer 505 upwards at an angle.

[0046] By filling the outer peripheral gap with the outer soft rubber layer 508, the channels for seepage and leakage in the outer peripheral gap are blocked, thus improving the reliability of the seal. Because the top of the bottom layer 504 is inclined upwards from bottom to top, the top layer 505 is compressed laterally and extends outwards and upwards along the inclined top surface of the bottom layer 504. The outer part of the top layer 505 is expanded laterally, thereby increasing the sealing contact area between the sealing ring 500 and the pole post 400 and the pole post hole 101.

[0047] As an extended embodiment, in preparation step 4), an inner ring 509 is formed on the inner side of the top layer 505, and the inner ring 509 is covered with a rigid inner ring plate 510, while the inner side of the bottom layer 504 is left empty and freely arranged; in preparation step 5), during the elastic compression deformation of the bottom layer 504 and the top layer 505 respectively, the inner ring 509 is in a laterally fixed state due to the restriction of the inner ring plate 510, so that the top layer 505 is compressed and elastically deformed towards the outside.

[0048] The inner ring plate 510 restricts the lateral deformation of the inner ring 509, keeping the inner ring 509 in a laterally fixed state. Therefore, the compressive deformation of the top layer 505 can only occur outward. Meanwhile, the top layer 505 is constrained by the lateral fixation of the inner ring 509 and the upward tilt of the bottom layer 504. When under pressure, it extends in the upward direction of the outer soft rubber layer 508. The outer part of the top layer 505 is elastically compressed and expanded, thereby increasing the outer sealing contact area of ​​the sealing ring 500.

[0049] The above description is merely 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 preparing a battery cover plate, characterized in that, The preparation steps include the following: 1) A top cover plate is formed by stamping. The top cover plate is provided with two vertically through pole holes, an explosion-proof hole and a liquid injection hole. A surrounding ring is formed on the top of the top cover plate. The surrounding ring is arranged around the pole holes in the circumference. A ring platform is formed at the bottom of the pole holes. 2) Cover the explosion-proof hole with an explosion-proof valve and weld the explosion-proof valve to the top cover plate; 3) Provide an electrode post, the electrode post including a lower section and an upper section formed on the lower section, the diameter of the lower section being larger than the diameter of the upper section, an outer plastic ring being injection molded on the outer periphery of the lower section, the outer plastic ring being arranged around the lower section in a circumferential direction; the outer plastic ring including an outer peripheral section formed on the outer periphery of the lower section and a top section formed on the top of the lower section, the top section and the outer peripheral section being bent to form a bent section; 4) Place a sealing ring on the annular platform, place the pole post in the pole post hole, press the bottom of the lower section against the sealing ring, and there is an outer peripheral gap between the outer peripheral section and the surrounding ring; 5) The upper part of the surrounding ring is riveted and bent downwards to form a bent ring. The bent ring is pressed against the top section, and a downward pressing pressure is applied to the top section so that the sealing ring is in an elastic compression deformation state. The lower part of the surrounding ring forms a longitudinally arranged longitudinal ring, the outer peripheral gap is formed between the longitudinal ring and the outer peripheral segment, and a bending interval is formed between the bending ring and the upper segment, the bending interval being arranged around the upper segment circumferentially. 6) An upper plastic ring is injection molded on the top cover sheet. The upper plastic ring has an inner section and an outer section. The inner section is embedded in the bending interval and fills the bending interval. The outer section covers the outer periphery of the surrounding ring, and the inner section and the outer section are integrally formed. 7) Install a plastic plate at the bottom of the top cover plate and attach a film layer to the explosion-proof valve; In the preparation step 5), after the sealing ring is compressed and deformed, a transversely fixed concave-convex locking structure is formed between the bottom of the sealing ring and the top of the annular platform. The concave-convex locking structure is arranged in a ring along the circumference of the pole post. During the process of elastic compression and deformation of the sealing ring, the concave-convex locking structure is simultaneously squeezed longitudinally, while the concave-convex locking structure remains laterally fixed, and the bottom of the sealing ring extends laterally elastically away from the concave-convex locking structure.

2. The method for preparing a battery cover plate as described in claim 1, characterized in that, In preparation step 1), the top of the annular platform is recessed downwards to form a recessed retaining ring groove, which is arranged around the circumference of the annular platform; in preparation step 5), when the sealing ring is elastically compressed and deformed, the bottom of the sealing ring is embedded in the retaining ring groove to form a protrusion, which fills the retaining ring groove to form the concave-convex retaining structure.

3. The method for preparing a battery cover plate as described in claim 1, characterized in that, In the preparation step 4), a rigid positioning ring is built into the sealing ring. When the sealing ring is placed on the annular platform, the sealing ring is located above the retaining ring groove. In step 5 of the preparation process, after the sealing ring is compressed and elastically deformed, the positioning ring is embedded downward in the retaining ring groove so that the concave-convex retaining structure is laterally fixed and the positioning ring is wrapped in the protrusion.

4. The method for preparing a battery cover plate as described in claim 3, characterized in that, In preparation step 1), the top of the retaining ring groove is open to form a top opening, and the two sides of the top opening are respectively formed with bent top edges, and the two top edges are nested at intervals; in preparation step 4), the bottom of the sealing ring is provided with two bottom ring grooves that are embedded at intervals, and the positioning ring is located between the two bottom ring grooves and is arranged at intervals with the two bottom ring grooves. In the preparation step 5), after the bottom of the sealing ring is embedded in the retaining ring groove to form a protrusion, the protrusion passes through the top opening and fills the retaining ring groove. The two top edges are embedded in the two bottom ring grooves so that the concave-convex retaining structure is fixed laterally.

5. The method for preparing a battery cover plate as described in claim 1, characterized in that, In the preparation step 3), the top of the lower section is provided with a plurality of recessed internal notches, and the plurality of internal notches are arranged around the lower section at intervals along the circumference; after an outer plastic ring is formed on the outer periphery of the lower section, the top section is embedded to fill the internal notches, so that the outer plastic ring and the lower section are engaged and connected as one.

6. The method for preparing a battery cover plate according to any one of claims 1-5, characterized in that, In the preparation step 3), the top section is provided with multiple external notches, and the multiple external notches are arranged around the top section at circumferential intervals. The external notches extend downward, pass through the bent section, and extend to the outer peripheral section. The outer peripheral gap is connected to the external notches. In the preparation step 6), after the upper plastic ring is formed by injection molding on the top cover sheet, the inner segment passes through the outer notch and extends into the outer peripheral gap, and the inner segment fills the outer notch.

7. The method for preparing a battery cover plate as described in claim 6, characterized in that, In preparation step 3), the top section is provided with a plurality of external protrusions, which are arranged around the top section at intervals in the circumference; in preparation step 5), after the upper part of the surrounding ring is riveted and bent downward to form a bent ring, the bent ring presses against the external protrusions so that the top of the bent section and the external notch are arranged at intervals, and a top gap is formed between the bent section and the top section, which is arranged around the top section at intervals in the circumference. In step 6), after the upper plastic ring is formed by injection molding on the top cover sheet, the inner section passes through the top gap and fills the top gap.

8. The method for preparing a battery cover plate according to any one of claims 1-5, characterized in that, In preparation step 1), the annular platform is provided with a downwardly recessed stepped ring, which is arranged around the circumference of the annular platform; in preparation step 7), the lower plastic plate is provided with a raised ring, which encloses to form a hollow area; the top of the raised ring is provided with an outwardly extending buckle ring, which is arranged around the circumference of the raised ring. The protruding ring is inserted into the electrode hole from bottom to top and is positioned below the electrode. The bottom of the electrode is exposed through the hollow area. The snap ring is embedded in the stepped ring and snapped together with the annular platform to fix the lower plastic plate to the bottom of the top cover.

9. The method for preparing a battery cover plate according to any one of claims 1-5, characterized in that, In the preparation step 4), along the direction of the sealing ring from bottom to top, the sealing ring includes a bottom layer and a top layer covering the bottom layer. Along the direction of the bottom layer from inside to outside, the top of the bottom layer is arranged obliquely from bottom to top, and the bottom of the top layer covers and presses against the top of the bottom layer. A middle soft rubber strip is provided between the bottom of the top layer and the top of the bottom layer. The middle soft rubber strip is arranged in a ring along the circumference of the bottom layer. The middle soft rubber strip is connected to both the bottom layer and the top layer, so that the top layer and the bottom layer are connected as one unit. An outer ring is formed on the outer side of the top layer, the outer ring is covered with an outer soft rubber layer, the outer soft rubber layer extends downward and connects with the outer periphery of the bottom layer, so that the outer side of the top layer and the outer side of the bottom layer are connected as one; In step 5 of the preparation process, after the bending section applies downward pressure to the top section, the bottom layer and the top layer are elastically compressed and deformed respectively. The outer peripheral soft rubber layer is squeezed from bottom to top into the outer peripheral gap and fills the outer peripheral gap. During the elastic compression deformation of the top layer, the top layer is fixed in the middle soft rubber strip and undergoes lateral elastic compression deformation relative to the bottom layer. The top guide of the bottom layer extends upward in an inclined direction.

10. The method for preparing a battery cover plate as described in claim 9, characterized in that, In preparation step 4), an inner ring is formed on the inner side of the top layer, and the inner ring is covered with a rigid inner ring plate. The inner side of the bottom layer is left empty and freely arranged. In preparation step 5), during the elastic compression deformation of the bottom layer and the top layer, the inner ring is restricted by the inner ring plate and is in a laterally fixed state so that the top layer is compressed and elastically deformed towards the outside.

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