Assembly method for battery top cover

Abstract

The present application relates to the technical field of battery top covers. Disclosed is an assembly method for a battery top cover. The assembly method comprises the following assembly steps: providing a connecting piece, wherein the connecting piece is provided with an electrode column, a through center hole is provided in the middle of the electrode column, and a mounting hole is provided in a top cover piece; passing the electrode column through a lower plastic member, a sealing ring and the mounting hole, wherein a mounting groove is provided on an upper end face of the top cover piece, an upper plastic member is mounted on the mounting groove, an electrode block is mounted on the upper plastic member, and a stamping section is provided on an upper portion of the electrode column; performing vertical clamping by means of a mold, a fixture, a tooling or a jig; inserting a sealing member into the center hole from top to bottom, wherein under the pressing of an expansion portion, the stamping section is flanged radially outwards to form an outward expansion portion, with the bottom of the external expansion portion abutting against the electrode block; and finally, performing fixing by means of welding, thereby forming a battery top cover. The sealing member is embedded into the center hole, and the pressing causes the electrode column to be flanged outwards, thereby ensuring that the sealing ring achieves a certain compression amount; and then assemblies are mutually fixed by means of welding; therefore, a good sealing effect is achieved.

Description

How to assemble the battery top cover

[0001] This application claims priority to Chinese patent application CN202311149161.2, filed on September 7, 2023, with the invention name “Assembly method of battery top cover”. The entire contents of the above Chinese patent application are incorporated into this application by reference. Technical Field

[0002] This patent application relates to the technical field of battery top covers, and specifically, to an assembly method of a battery top cover. Background Art

[0003] The battery includes a battery top cover, a shell and a battery cell, wherein the battery top cover includes a top cover plate and a pole arranged on the top cover plate. Among them, the pole is one of the important components of the battery. The quality of its connection will directly affect the use effect and service life of the battery, so the assembly between the top cover plate and the pole is particularly important. Technical issues

[0004] In the prior art, the battery top cover assembly process typically involves first encapsulating the terminal post and welding ring into an integral form, then welding the welding ring to the top cover to secure the terminal post. Simultaneously, the sealing ring is clamped between the terminal post and the top cover to ensure a certain degree of compression. However, when using the welding ring to secure the terminal post, poor welding between the welding ring and the terminal post can easily lead to an unstable overall structure, significantly compromising its sealing performance and causing poor sealing performance. Technical Solutions

[0005] The purpose of this application is to provide a method for assembling a battery top cover, aiming to solve the problems in the prior art.

[0006] The present application is implemented as follows: a method for assembling a battery top cover includes the following assembly steps:

[0007] 1) Provide a connecting piece, the connecting piece including a first connecting plate with a pole and a second connecting plate connected to the battery cell, the first connecting plate having an upwardly arranged connecting surface with a pole protruding upwardly on the connecting surface, the second connecting plate connected to one end of the first connecting plate and bent downward away from the pole; the middle of the pole has a central hole extending vertically therethrough, the central hole extending from top to bottom through the pole and the first connecting plate;

[0008] Providing a top cover sheet with a mounting hole extending vertically therethrough; passing the pole through the lower plastic part, the sealing ring, and the mounting hole, respectively; the lower plastic part and the sealing ring are arranged around the outer circumference of the pole;

[0009] 2) The upper end surface of the top cover has a downwardly recessed mounting groove, which is arranged around the outer periphery of the mounting hole and is in communication with the mounting hole; the upper plastic part is installed on the mounting groove from top to bottom, and the upper plastic part is arranged around the outer periphery of the pole, and the upper part of the pole passes through the upper plastic part;

[0010] Providing a pole block, and installing the pole block on the upper plastic part, wherein the pole block is pressed against the upper plastic part from top to bottom, and the upper part of the pole column has a stamping section located above the pole block;

[0011] When the pole piece is pressed steadily against the upper plastic part, a top cover assembly to be pressed is formed;

[0012] 3) Clamp the top cover assembly to be pressed up and down using a mold or fixture, tooling, or jig;

[0013] 4) Providing a cylindrical sealing member, wherein the upper portion of the sealing member radially expands outward to form an expansion portion, and the axial length of the sealing member is less than the axial length of the central hole; inserting the sealing member into the central hole from top to bottom until the top of the expansion portion is flush with the top of the pole piece and the bottom of the sealing member is flush with the bottom of the first connecting plate; under the pressure of the expansion portion, the stamping section radially turns outward to form an outward expansion portion, and the bottom of the outward expansion portion presses against the pole piece;

[0014] 5) Welding and fixing; by welding, respectively, the outer periphery of the top of the seal is fixed to the outward expansion portion, the outer periphery of the bottom of the seal is fixed to the first connecting plate to ensure overcurrent, and the outer periphery of the outward expansion portion is fixed to the pole block to ensure overcurrent; forming the battery top cover.

[0015] Optionally, the pole, the first connecting plate and the second connecting plate are integrally formed.

[0016] Optionally, the middle portion of the pole block has a through hole for the upper portion of the pole to pass through, and the top of the through hole has an outwardly recessed radially outwardly expanding groove; in step 4), under the pressure of the expansion portion, the stamped section is turned outward until the outer periphery of the stamped section presses against the side wall of the outwardly expanding groove, thereby forming the outwardly expanding portion;

[0017] The top of the outwardly expanding portion is flush with the top of the pole piece, and the bottom of the outwardly expanding portion is pressed against the outwardly expanding groove.

[0018] Optionally, in step 1), the sealing ring wraps around the outer circumference of the pole and the bottom of the sealing ring presses against the connecting piece, a sealing gap is formed between the connecting surface and the lower surface of the top cover piece, and the sealing ring is clamped and fixed in the sealing gap;

[0019] The lower plastic part is also arranged in the sealing interval and is arranged around the outer circumference of the sealing ring.

[0020] Optionally, the top cover sheet has a surrounding mounting wall, the mounting wall encloses the mounting hole, and an annular gap is formed between the outer periphery of the pole and the mounting hole; the top of the sealing ring extends upward to form an upper ring, and the upper ring is arranged around the inner periphery of the sealing ring;

[0021] In step 1), the upper ring is inserted into the annular space from bottom to top, and the upper ring is clamped and fixed in the annular space.

[0022] Optionally, the upper surface of the lower plastic part presses against the lower surface of the top cover from bottom to top, the upper surface of the lower plastic part has an upper positioning post protruding upward, and the lower surface of the top cover has an upper positioning hole recessed upward; in step 1), the upper positioning post is embedded in the upper positioning hole;

[0023] The connecting surface abuts against the lower surface of the lower plastic part from bottom to top. The lower surface of the lower plastic part has a lower positioning column protruding downward. The first connecting surface has a lower positioning hole formed by a downward depression. In step 1), the lower positioning column is embedded in the lower positioning hole.

[0024] Optionally, the outer periphery of the upper plastic part extends upward to form an upper extension ring, and the upper extension ring is arranged along the circumference of the upper plastic part, and the upper extension ring surrounds and forms a mounting area;

[0025] In step 2), the bottom of the pole block presses against the upper end surface of the upper extension ring from top to bottom, and the bottom of the pole block has a lower protrusion extending downward and embedded in the installation area. The lower protrusion is completely embedded in the installation area, and the pole block is installed and matched with the upper plastic part.

[0026] Optionally, in step 4), before forming the outwardly flared portion, the top of the stamping segment has an annular trend wall, and along a bottom-up direction, the trend wall extends radially outward in an arc shape;

[0027] Under the extrusion action of the expansion portion, the trend wall is radially turned outward until the outward expansion portion is formed.

[0028] Optionally, in step 4), the pole includes an annular raised ring, the top of the raised ring abuts against the bottom of the flared portion, the raised ring has an annular sidewall disposed toward the seal, and the outer periphery of the seal has an abutment wall abutting against the annular sidewall; from top to bottom, the annular sidewall extends radially inwardly and obliquely, and the abutment wall extends radially inwardly and obliquely;

[0029] In step 5), when the seal, pole and pole block are made of the same material, full-circle welding is used to achieve welding fixation; when the seal, pole and pole block are made of different materials, brazing is used to achieve welding fixation.

[0030] Optionally, the outer peripheral fixing sleeve of the abutting wall is provided with a plurality of rubber rings, the rubber rings are arranged around the outer periphery of the sealing member, the plurality of rubber rings are arranged at intervals along the axial direction of the sealing member, the inner peripheries of the rubber rings are embedded in the sealing member, and the outer peripheries of the rubber rings are exposed;

[0031] The annular side wall has a plurality of radially outwardly recessed positioning ring grooves, the positioning ring grooves are arranged around the circumference of the annular side wall, and the plurality of positioning ring grooves are arranged at intervals along the axial direction of the raised ring of the seal, and the cross section of the positioning ring grooves is arc-shaped;

[0032] In step 4), during the process of embedding the seal into the center hole from top to bottom, the rubber ring is elastically deformed under the clamping force of the abutment wall and the annular side wall until the rubber ring is embedded into the positioning ring groove and rebounds. Beneficial effects

[0033] Compared with the prior art, the assembly method of the battery top cover provided in the present application is to install the connecting plate with the pole, the sealing ring, the lower plastic part, the top cover plate, the upper plastic part and the pole block in the mounting hole in sequence, and then embed the sealing part in the center hole, so that the top of the pole is turned outward and the multiple components are compactly connected, while ensuring that the sealing ring reaches a certain compression amount, and then through welding, a battery top cover with a compact and stable overall structure is formed, and the sealing is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] FIG1 is a perspective schematic diagram of a battery top cover provided in the present application;

[0035] FIG2 is an enlarged schematic diagram of point A in FIG1 provided by the present application;

[0036] FIG3 is a schematic cross-sectional view of a battery top cover provided in the present application;

[0037] FIG4 is an enlarged schematic diagram of point B in FIG3 provided by the present application;

[0038] FIG5 is a perspective schematic diagram of a sealing ring provided in the present application;

[0039] FIG6 is a perspective schematic diagram of the lower plastic part provided by the present application;

[0040] FIG7 is a bottom view of the top cover sheet provided in the present application;

[0041] FIG8 is a cross-sectional schematic diagram of the connecting piece provided by the present application before being embedded in the sealing member;

[0042] FIG9 is a cross-sectional schematic diagram of the connecting piece provided by the present application after being embedded in the sealing member;

[0043] FIG10 is an assembly diagram of step 4) provided in this application;

[0044] FIG11 is a schematic cross-sectional view of the battery top cover provided in the present application. Modes for Carrying Out the Invention

[0045] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0046] The implementation of this application is described in detail below with reference to specific embodiments.

[0047] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0048] 1-11 , which are preferred embodiments of the present application.

[0049] The assembly method of the battery top cover provided in this application includes the following assembly steps:

[0050] 1) Provide a connecting piece 200, which includes a first connecting plate 201 with a pole 210 and a second connecting plate 202 connected to the battery cell. The first connecting plate 201 has an upwardly arranged connecting surface with an upwardly protruding pole 210 on the connecting surface. The second connecting plate 202 is connected to one end of the first connecting plate 201 and bends downward away from the pole 210. The middle of the pole 210 has a central hole that passes through the pole 210 and the first connecting plate 201 from top to bottom.

[0051] Provide a top cover sheet 100 having a mounting hole 10 extending therethrough; insert the pole 210 through the lower plastic part 700, the sealing ring 300, and the mounting hole 10, respectively; and arrange the lower plastic part 700 and the sealing ring 300 around the periphery of the pole 210;

[0052] 2) The upper end surface of the top cover 100 has a downwardly recessed mounting groove 101. The mounting groove 101 surrounds the outer periphery of the mounting hole 10 and is in communication with the mounting hole 10. The upper plastic part 500 is installed on the mounting groove 101 from top to bottom. The upper plastic part 500 surrounds the outer periphery of the pole 210, and the upper portion of the pole 210 passes through the upper plastic part 500.

[0053] Provide a pole block 400, and install the pole block 400 on the upper plastic part 500, with the pole block 400 pressing against the upper plastic part 500 from top to bottom. The upper portion of the pole post 210 has a stamping section located above the pole block 400;

[0054] When the pole piece 400 is pressed steadily against the upper plastic part 500, a top cover assembly to be pressed is formed;

[0055] 3) Use molds or fixtures, tooling, and jigs to clamp the top cover assembly up and down;

[0056] 4) Provide a cylindrical seal 600, with the upper portion of the seal 600 radially extending outward to form an extension portion 601. The axial length of the seal 600 is less than the axial length of the center hole. Insert the seal 600 into the center hole from top to bottom until the top of the extension portion 601 is flush with the top of the pole piece 400 and the bottom of the seal 600 is flush with the bottom of the first connecting plate 201. Under the pressure of the extension portion 601, the stamping section radially turns outward to form an outward expansion portion 212. The bottom of the outward expansion portion 212 presses against the pole piece 400.

[0057] 5) Welding and fixing; by welding, respectively, the outer periphery of the top of the seal 600 is welded to the outer expansion portion 212, and the outer periphery of the bottom of the seal 600 is welded to the first connecting plate 201 to ensure overcurrent, and the outer periphery of the outer expansion portion 212 is welded to the pole block 400 to ensure overcurrent; forming the battery top cover.

[0058] The assembly method of the battery top cover provided above is to install the connecting piece 200 with the pole 210, the sealing ring 300, the lower plastic part 700, the top cover piece 100, the upper plastic part 500 and the pole block 400 in the mounting hole 10 in sequence, and then embed the sealing member 600 in the center hole, so that the top of the pole 210 is turned outward and the multiple components are compactly connected. At the same time, it is ensured that the sealing ring 300 reaches a certain amount of compression, and then by welding, a battery top cover with a compact and stable overall structure is formed with better sealing.

[0059] Specifically, the pole 210, the first connecting plate 201 and the second connecting plate 202 are integrally formed, so that the overall structure is stable, the installation process is reduced, and the cost is reduced.

[0060] Specifically, the middle portion of the pole block 400 has a through hole for the upper portion of the pole post 210 to pass through, and the top of the through hole has an outwardly recessed radially outwardly extending groove 401. In step 4), under the pressure of the expansion portion 601, the stamped section is turned outward until the outer periphery of the stamped section presses against the sidewall of the outwardly extending groove 401, forming the outwardly extending portion 212.

[0061] The top of the outwardly expanded portion 212 is flush with the top of the pole piece 400, and the bottom of the outwardly expanded portion 212 presses against the outwardly expanded slot 401. In this way, by adapting the pole piece 400 having the outwardly expanded slot 401, the space formed by the outwardly expanded portion 212 is reserved, which plays a role in shaping the outwardly expanded portion 212, making the connection between the pole piece 400 and the pole post 210 tighter and more stable after welding.

[0062] In step 1), the sealing ring 300 wraps around the outer periphery of the pole 210 and the bottom of the sealing ring 300 presses against the connecting piece 200. A sealing gap is formed between the connecting surface and the lower surface of the top cover piece 100, and the sealing ring 300 is clamped and fixed in the sealing gap.

[0063] A lower plastic part 700 is also arranged in the sealing interval, and the lower plastic part 700 is arranged around the outer periphery of the sealing ring 300. In this way, through the action of the lower plastic part 700 and the sealing ring 300, the connecting piece 200 and the top cover piece 100 are effectively isolated to avoid short circuit.

[0064] The top cover 100 has a surrounding mounting wall that encloses a mounting hole 10. An annular gap is formed between the outer periphery of the pole 210 and the mounting hole 10. The top of the sealing ring 300 extends upward to form an upper ring 310. The upper ring 310 is arranged around the inner periphery of the sealing ring 300.

[0065] In step 1), upper ring 310 is inserted into the annular spacer from bottom to top, where it is clamped and secured. This design effectively prevents contact between the mounting wall and the pole 210, preventing short circuits. It also secures the sealing ring 300, ensuring a secure seal.

[0066] The upper surface of the lower plastic part 700 is pressed against the lower surface of the top cover 100 from bottom to top. The upper surface of the lower plastic part 700 has an upwardly protruding upper positioning post 720, and the lower surface of the top cover 100 has an upwardly recessed upper positioning hole 20. In step 1), the upper positioning post 720 is embedded in the upper positioning hole 20.

[0067] The connecting surface abuts against the lower surface of the lower plastic part 700 from bottom to top. The lower surface of the lower plastic part 700 has a lower positioning column 710 protruding downward, and the first connecting surface has a lower positioning hole 2000 recessed downward. In step 1), the lower positioning column 710 is embedded in the lower positioning hole 2000.

[0068] By embedding the upper positioning post 720 into the upper positioning hole 20 and the lower positioning post 710 into the lower positioning hole 2000 , the connecting piece 200 and the lower plastic component 700 are positioned and installed on the lower surface of the top cover piece 100 .

[0069] The outer periphery of the upper plastic part 500 extends upward to form an upper extension ring 510. The upper extension ring 510 is arranged around the circumference of the upper plastic part 500 to surround and form a mounting area.

[0070] In step 2), the bottom of pole piece 400 presses downward against the upper end surface of upper extension ring 510. The bottom of pole piece 400 has a downwardly extending protrusion 410 that embeds into the mounting area. This protrusion 410 is fully embedded in the mounting area, and pole piece 400 is assembled and mated with upper plastic component 500. This mating relationship between upper extension ring 510 and protrusion 410 secures pole piece 400 to upper plastic component 500, resulting in a compact overall structure and a more stable connection.

[0071] In this embodiment, in step 4), before the outward expansion portion 212 is formed, the top of the stamping section has an annular trend wall 2100 , and along the bottom-up direction, the trend wall 2100 extends radially outward in an arc shape;

[0072] Under the pressure of the expansion portion 601, the trend wall 2100 is radially turned outward until it forms the outward expansion portion 212. In this way, the trend wall 2100 can be formed on, but is not limited to, the top side wall of the center hole as shown in the figure. When the seal 600 is pressed, the trend wall 2100 is turned outward along the arc extending outward, playing a guiding role.

[0073] In this embodiment, in step 4), the pole 210 includes an annular raised ring 211, the top of which abuts the bottom of the flared portion 212. The raised ring 211 has an annular sidewall facing the seal 600, and the outer periphery of the seal 600 has an abutment wall that abuts the annular sidewall. From top to bottom, the annular sidewall extends radially inward and tilts, while the abutment wall extends radially inward and tilts. The design of the inclined annular sidewall and abutment wall significantly increases the contact area and the force-bearing area compared to a longitudinal extension. It also utilizes the gravity of the seal 600 itself, making the overall connection more compact and more stable.

[0074] In step 5), when the seal 600, the pole 210 and the pole block 400 are made of the same material, full-circle welding is used to achieve welding fixation; when the seal 600, the pole 210 and the pole block 400 are made of different materials, brazing is used to achieve welding fixation.

[0075] In this embodiment, a plurality of rubber rings 800 are fixedly mounted on the outer periphery of the abutting wall. The rubber rings 800 are arranged around the outer periphery of the sealing member 600 and are spaced apart along the axial direction of the sealing member 600. The inner peripheries of the rubber rings 800 are embedded in the sealing member 600, and the outer peripheries of the rubber rings 800 are exposed.

[0076] The annular sidewall has a plurality of radially outwardly recessed positioning grooves 2110. The positioning grooves 2110 are arranged circumferentially along the annular sidewall. The plurality of positioning grooves 2110 are spaced apart axially along the raised ring 211 of the seal 600. The cross-section of the positioning grooves 2110 is arc-shaped.

[0077] In step 4), as the seal 600 is inserted into the center hole from top to bottom, the rubber ring 800 elastically deforms under the clamping force of the abutment wall and the annular sidewall until the rubber ring 800 is embedded in the positioning ring groove 2110, at which point the rubber ring 800 rebounds. In this way, the rubber ring 800's elasticity allows it to be embedded within the inner periphery of the seal 600, securing the outer periphery of the seal 600 with the rubber ring 800. This also acts as a downward pressure on the rubber ring 800, and the elastic force of the rubber ring 800 strengthens the connection between the seal 600 and the terminal 210.

[0078] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A method for assembling a battery top cover, characterized in that: The assembly steps include: 1) Provide a connecting piece, the connecting piece includes a first connecting plate with a pole and a second connecting plate connected to the battery cell, the first connecting plate has an upwardly arranged connecting surface, the connecting surface is provided with a pole protruding upward, the second connecting plate is connected to one end of the first connecting plate and is bent downward away from the pole; the middle of the pole has a central hole penetrating from top to bottom, and the central hole penetrates the pole and the first connecting plate from top to bottom; Provide a top cover sheet, the top cover sheet has a mounting hole penetrating from top to bottom; pass the pole through the lower plastic part, the sealing ring and the mounting hole respectively, and the lower plastic part and the sealing ring are arranged around the outer circumference of the pole; 2) The upper end surface of the top cover sheet has a mounting groove formed by a downward depression, the mounting groove is arranged around the outer periphery of the mounting hole and is connected to the mounting hole; the upper plastic part is installed on the mounting groove from top to bottom, the upper plastic part is arranged around the outer periphery of the pole, and the upper part of the pole passes through the upper plastic part; Providing a pole block, installing the pole block on the upper plastic part, the pole block is pressed against the upper plastic part from top to bottom, and the upper part of the pole column has a stamping section located above the pole block; When the pole block is stably pressed against the upper plastic part, a cover assembly to be pressed is formed; 3) Clamp the top cover assembly to be pressed up and down using a mold or a fixture, a tooling, or a jig; 4) Provide a cylindrical seal, the upper part of which is radially expanded outward to form an expansion part, and the axial length of the seal is less than the axial length of the center hole; insert the seal into the center hole from top to bottom until the top of the expansion part is flush with the top of the pole block and the bottom of the seal is flush with the bottom of the first connecting plate; under the pressure of the expansion part, the stamping section is radially turned outward to form an outward expansion part, and the bottom of the outward expansion part is pressed against the pole block; 5) Welding and fixing; by welding, the top of the seal is fixed to the pole, the outer periphery of the bottom of the seal is fixed to the first connecting plate to ensure the flow of current, and the outer periphery of the outer expansion part is fixed to the pole block to ensure the flow of current; the battery top cover is formed.

2. The method for assembling a battery top cover according to claim 1, characterized in that: The pole, the first connecting plate and the second connecting plate are integrally formed.

3. The method for assembling a battery top cover according to claim 1, characterized in that: The middle part of the pole block has a through hole for the upper part of the pole to pass through, and the top of the through hole has an outward expansion groove that is radially concave outward; in the step 4), under the extrusion of the expansion part, the stamping section is turned outward until the outer periphery of the stamping section presses against the side wall of the outward expansion groove to form the outward expansion part; The top of the outward expansion portion is flush with the top of the pole block, and the bottom of the outward expansion portion is pressed against the outward expansion groove.

4. The method for assembling a battery top cover according to claim 1, characterized in that: In step 1), the sealing ring wraps around the outer circumference of the pole and the bottom of the sealing ring presses against the connecting sheet, a sealing gap is formed between the connecting surface and the lower surface of the top cover sheet, and the sealing ring is clamped and fixed in the sealing gap; The lower plastic part is also arranged in the sealing interval, and the lower plastic part is arranged around the outer circumference of the sealing ring.

5. The method for assembling a battery top cover according to claim 4, characterized in that: The top cover sheet has a surrounding mounting wall, the mounting wall encloses the mounting hole, and an annular gap is provided between the outer periphery of the pole and the mounting hole; the top of the sealing ring extends upward to form an upper ring, and the upper ring is arranged around the inner periphery of the sealing ring; In the step 1), the upper ring is inserted into the annular space from bottom to top, and the upper ring is clamped and fixed in the annular space.

6. The method for assembling a battery top cover according to claim 1, characterized in that: The upper surface of the lower plastic part is pressed against the lower surface of the top cover sheet from bottom to top, the upper surface of the lower plastic part has an upper positioning column protruding upward, and the lower surface of the top cover sheet has an upper positioning hole formed by being recessed upward; in step 1), the upper positioning column is embedded in the upper positioning hole; The connecting surface abuts against the lower surface of the lower plastic part from bottom to top, the lower surface of the lower plastic part has a lower positioning column protruding downward, and the connecting surface has a lower positioning hole formed by a downward depression; in step 1), the lower positioning column is embedded in the lower positioning hole.

7. The method for assembling a battery top cover according to claim 1, characterized in that: The outer circumference of the upper plastic part extends upward to form an upper extension ring, and the upper extension ring is arranged around the circumference of the upper plastic part, and the upper extension ring surrounds and forms a mounting area; In step 2), the bottom of the pole block presses against the upper end surface of the upper extension ring from top to bottom, and the bottom of the pole block has a lower protrusion extending downward and embedded in the installation area, the lower protrusion is completely embedded in the installation area, and the pole block is installed and matched with the upper plastic part.

8. The method for assembling a battery top cover according to claim 1, characterized in that: In the step 4), before the outward expansion portion is formed, the top of the punching section has an annular trend wall, and along the direction from bottom to top, the trend wall extends radially outward in an arc shape; Under the extrusion effect of the expansion portion, the trend wall is radially turned outward until the outward expansion portion is formed.

9. The method for assembling a battery top cover according to any one of claims 1 to 8, characterized in that: In step 4), the pole comprises an annular raised ring, the top of the raised ring is butted against the bottom of the outwardly expanded portion, the raised ring has an annular side wall arranged toward the seal, and the outer periphery of the seal has an abutment wall abutting against the annular side wall; along the top-to-bottom direction, the annular side wall is arranged to extend radially inwardly and tilted, and the abutment wall is arranged to extend radially inwardly and tilted; In step 5), when the seal, pole and pole block are made of the same material, full-circle welding is used to achieve welding fixation; when the seal, pole and pole block are made of different materials, brazing is used to achieve welding fixation.

10. The method for assembling a battery top cover according to claim 9, characterized in that: The outer peripheral fixed sleeve of the abutting wall is provided with a plurality of rubber rings, the rubber rings are arranged around the outer periphery of the sealing member, the plurality of rubber rings are arranged at intervals along the axial direction of the sealing member, the inner periphery of the rubber rings is embedded in the sealing member, and the outer periphery of the rubber rings is exposed; The annular side wall has a plurality of radially outwardly recessed positioning ring grooves, the positioning ring grooves are arranged around the circumference of the annular side wall, and the plurality of positioning ring grooves are arranged at intervals along the axial direction of the raised ring of the seal, and the cross section of the positioning ring groove is in an arc shape; In step 4), during the process of embedding the seal into the center hole from top to bottom, the rubber ring is elastically deformed under the clamping force of the abutment wall and the annular side wall until the rubber ring is embedded into the positioning ring groove and the rubber ring rebounds.

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