Method for assembling battery top cover assembly

Abstract

Disclosed in the present application is a method for assembling a battery top cover assembly. The method comprises the following assembly steps: an upper hole being provided in the middle of an electrode block, a plurality of upper strip-shaped grooves being provided in the bottom of the electrode block, an electrode column being inserted downwards and passing through the upper hole, and the electrode column being fixed to the electrode block; a lower hole being provided in the middle of an upper plastic member, the upper plastic member being provided with upwards protruding strips and downwards protruding strips, and the electrode column being inserted downwards and passing through the lower hole until the upwards protruding strips fit with the upper strip-shaped grooves; a mounting hole being provided in a top cover piece, a mounting groove being provided on an upper surface of the top cover piece, lower strip-shaped grooves being provided on the mounting groove, and the electrode column being inserted downwards and passing through the mounting hole until the downwards protruding strips fit with the lower strip-shaped grooves; a sealing ring and a lower plastic member being mounted; and a connecting hole being provided in a connecting piece, the electrode column being inserted downwards into the connecting hole, upward pressing and downward pressing being then performed synchronously until a bottom surface of the electrode column is flush with a lower surface of the connecting piece, and then the electrode column being welded and fixed to the connecting piece, thereby forming a stably connected battery top cover. The operation is simple.

Description

Assembly method of battery top cover assembly Technical Field

[0001] The present application relates to the technical field of battery top covers, and in particular to an assembly method of a battery top cover assembly. Background Art

[0002] With the development of modern society and the enhancement of people's environmental awareness, more and more devices choose lithium batteries as power sources, such as mobile phones, laptops, power tools and electric vehicles, etc., which provides broad space for the application and development of lithium batteries.

[0003] The battery top cover includes the pole, pole block, upper plastic part, top cover sheet, lower plastic part, sealing ring, connecting piece, etc. The upper plastic part is clamped between the pole block and the top cover sheet to avoid short circuit caused by direct contact. Technical issues

[0004] In the prior art, the pole passes through the top cover sheet, and then a clamping member is used to ensure that the top cover sheet and the pole are fixed. An upper plastic member is sleeved through the outer periphery of the upper part of the pole and fixed. Then, the pole block is installed on the outer periphery of the top of the pole and pressed against the upper plastic member. The pole block is fixed by welding and other processes. However, there is a lack of an assembly structure for reinforcing the connection between the upper plastic member and the top cover sheet, and there is a lack of an assembly structure for reinforcing the connection between the upper plastic member and the pole block, resulting in the problem that the connection between the pole block, the upper plastic member and the top cover sheet is not stable enough. In addition, the upper plastic member and the pole block are easily dislocated during assembly, and the overall operation is complicated. Technical Solutions

[0005] The purpose of this application is to provide an assembly method for a battery top cover assembly, aiming to solve the problem in the prior art that the connection between the upper plastic part and the top cover sheet is not stable enough, and the upper plastic part and the pole block are easily dislocated during assembly, making the overall operation complicated.

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

[0007] 1) Providing a pole block, wherein the middle portion of the pole block has an upper hole extending vertically therethrough, and the bottom portion of the pole block has a plurality of upper strip grooves formed by upward depressions, wherein the plurality of upper strip grooves are arranged at intervals around the periphery of the upper hole; providing a pole column, inserting the pole column downward and passing through the upper hole until the top surface of the pole column is flush with the top surface of the pole block, and then welding the pole column to the pole block to form a first assembly;

[0008] 2) Provide an upper plastic part, wherein the middle portion of the upper plastic part has a lower hole extending therethrough, the upper surface of the upper plastic part having a plurality of upper convex strips protruding upward, and the lower surface of the upper plastic part having a plurality of lower convex strips protruding downward, the lower convex strips being arranged in correspondence with the upper convex strips, and the plurality of upper convex strips and lower convex strips being arranged at intervals around the periphery of the lower hole; insert the pole in the first component downward through the lower hole until the plurality of upper convex strips are respectively embedded in the plurality of upper strip grooves, and the upper convex strips and the upper strip grooves are fixed together to form a second component;

[0009] 3) Provide a top cover sheet, wherein the top cover sheet is provided with a mounting hole extending vertically therethrough, and the upper surface of the top cover sheet is provided with a mounting groove formed by a downward depression, the mounting groove being arranged around the periphery of the mounting hole and being in communication with the mounting hole; the mounting groove is provided with a plurality of lower strip grooves formed by downward depressions, the plurality of lower strip grooves being arranged at intervals around the periphery of the mounting hole; insert the pole in the second assembly downward through the mounting hole until the plurality of lower ridges are respectively embedded in the plurality of lower strip grooves, the lower ridges and the lower strip grooves are fixedly engaged with each other to form a third assembly; the lower portion of the pole is exposed below the top cover sheet;

[0010] 4) Provide a sealing ring and a lower plastic part, and respectively sleeve the sealing ring and the lower plastic part on the outer periphery of the lower part of the pole to form a fourth component;

[0011] 5) Provide a connecting piece, which has an upwardly arranged connecting surface and a connecting hole extending vertically therethrough. Insert the pole in the fourth component into the connecting hole and press it up and down simultaneously until the bottom surface of the pole is flush with the lower surface of the connecting piece. Then, weld the pole and the connecting piece to form a battery top cover.

[0012] Optionally, the pole is columnar, and along the direction from top to bottom, the pole includes an upper section that expands radially outward, a middle section, and a lower section that contracts radially inward;

[0013] The upper section is exposed above the top cover, the middle section passes through the mounting hole, and the lower section is exposed in the direction of the top cover. Along the axial direction, there is a step between the upper section and the middle section, and there is a step between the middle section and the lower section.

[0014] The upper portion of the upper hole is radially recessed outward to form an upper step groove, which is arranged in a circular shape. In step 1), when the lower portion of the pole is inserted into the upper hole, the upper section is embedded in the upper step groove and fits in with each other.

[0015] Optionally, in step 2) and step 3), the middle section passes through the lower hole and the mounting hole from top to bottom, and in step 4), the sealing ring is fixedly sleeved on the outer periphery of the middle section.

[0016] Optionally, the upper portion of the connecting hole is radially recessed outward to form a lower step groove, and the lower step groove is arranged in a circular shape; in step 5), the bottom of the middle section is embedded in the lower step groove, and the lower section is embedded in the lower portion of the connecting hole.

[0017] Optionally, in step 5), a sealing gap is provided between the connecting surface and the top cover sheet, the sealing ring is arranged in the sealing gap, and the sealing ring is clamped and fixed in the sealing gap; a lower plastic part is also arranged in the sealing gap, and the lower plastic part is arranged around the outer circumference of the sealing ring.

[0018] Optionally, the top cover sheet has a circumferential mounting wall, which encloses the mounting hole, and an annular space is provided between the outer periphery of the pole and the mounting wall, and the top of the sealing ring extends toward the annular space to form an upper ring; in step 4), the upper ring is embedded in the annular space and is clamped and fixed between the pole and the top cover sheet.

[0019] 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 4), the upper positioning post is embedded in the upper positioning hole;

[0020] 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.

[0021] Optionally, in step 1), after the top surface of the pole is flush with the top surface of the pole block, welding is performed along the entire circumference of the top of the pole to securely connect the pole and the pole block;

[0022] In step 5), after the bottom surface of the pole is flush with the lower surface of the connecting piece, welding is performed along the entire circumference of the bottom of the pole to securely connect the pole and the connecting piece.

[0023] Optionally, the outer periphery of the upper plastic part extends upward to form an upper extension ring, which is arranged along the circumference of the upper plastic part and surrounds the mounting area. The bottom of the pole piece has a lower protrusion that protrudes downward and is embedded in the mounting area. The upper strip groove is formed on the bottom of the lower protrusion. The upper convex strip is formed in the surrounding area.

[0024] In step 2), the bottom of the pole block is pressed from top to bottom on the upper extension ring, and the lower protrusion is embedded in the installation area. The lower protrusion is fitted in the installation area until the upper protrusion is completely embedded in the upper strip groove.

[0025] Optionally, the upper extension ring has an annular wall arranged toward the installation area, the annular wall is provided with an elastic ring extending toward the installation area, and the elastic ring is arranged around the circumference of the annular wall; the outer periphery of the lower convex portion has an outer peripheral wall in an annular shape, the outer peripheral wall is provided with an annular groove formed by radially inward concavity, and the annular groove is arranged around the circumference of the outer peripheral wall;

[0026] In the step 2), during the process of embedding the lower convex portion into the installation area, the outer peripheral wall of the elastic ring expands radially outward under the squeezing action, and the lower convex portion continues to embed downward until the upper convex strip is completely embedded in the upper strip groove. The elastic ring and the annular groove are aligned, and the elastic ring is elastically reset under the action of elastic force. The elastic ring is embedded in the annular groove to prevent the pole piece from being disconnected under the action of axial force. Beneficial effects

[0027] Implementing the embodiments of this application will have the following beneficial effects:

[0028] Compared with the prior art, the assembly method of the battery top cover assembly provided by the present application is to first weld the pole and the pole block into one, then install multiple components of the battery top cover in sequence, and finally press to make the bottom surface of the pole flush with the bottom surface of the connecting piece, so as to ensure that the overall multiple components are clamped and fixed between the connecting piece and the pole block, the overall connection is stable, and the sealing ring reaches a certain compression amount; at the same time, a lower strip groove is provided in the installation groove, an upper strip groove is provided on the pole block, and upper and lower strips corresponding to each other are provided on the upper plastic part. The upper strip groove is embedded in the upper strip groove, and the lower strip groove is embedded in the lower strip groove, so that a stable connection is formed between the pole block, the upper plastic part and the top cover piece, and at the same time, the assembly between the upper plastic part, the top cover piece and the pole block is facilitated, thereby avoiding displacement during the assembly process and effectively preventing loosening under external force environment to cause safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0030] in:

[0031] FIG1 is a schematic cross-sectional view of a battery top cover provided in the present application;

[0032] Figure 2 is an enlarged schematic diagram of point A provided in this application;

[0033] FIG3 is a perspective schematic diagram of a pole provided by the present application;

[0034] FIG4 is a perspective schematic diagram of a pole block provided by the present application;

[0035] FIG5 is a perspective schematic diagram of a pole block provided by the present application;

[0036] FIG6 is a perspective schematic diagram of the upper plastic part provided by the present application;

[0037] FIG7 is a perspective schematic diagram of the upper plastic part provided by the present application;

[0038] FIG8 is a perspective schematic diagram of the top cover sheet provided in the present application;

[0039] FIG9 is a perspective schematic diagram of a top cover sheet provided in the present application;

[0040] FIG10 is a perspective schematic diagram of a sealing ring provided in the present application;

[0041] FIG11 is a perspective schematic diagram of a connecting piece provided by the present application;

[0042] FIG12 is a perspective schematic diagram of a connecting piece provided by the present application;

[0043] FIG13 is a perspective schematic diagram of the lower plastic part provided by the present application;

[0044] FIG14 is a schematic cross-sectional view of a portion of the battery top cover provided in the present application. Modes for Carrying Out the Invention

[0045] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0046] 1-14 , which are preferred embodiments provided by the present application.

[0047] The assembly method of the battery top cover assembly provided in this application includes the following assembly steps:

[0048] 1) Providing a pole block 300, wherein the pole block 300 has an upper hole 301 extending vertically through the middle thereof, and the bottom of the pole block 300 has a plurality of upper strip grooves 302 formed as an upward depression, wherein the plurality of upper strip grooves 302 are arranged at intervals around the outer periphery of the upper hole 301; providing a pole post 200, inserting the pole post 200 downwardly through the upper hole 301 until the top surface of the pole post 200 is flush with the top surface of the pole block 300, and then welding the pole post 200 to the pole block 300 to form a first assembly;

[0049] 2) Provide an upper plastic part 400, wherein the middle portion of the upper plastic part 400 has a lower hole 401 extending therethrough, and the upper surface of the upper plastic part 400 has a plurality of upwardly protruding upper ridges 402, and the lower surface of the upper plastic part 400 has a plurality of downwardly protruding lower ridges 403, wherein the lower ridges 403 and the upper ridges 402 are arranged in correspondence with each other, and the plurality of upper ridges 402 and the lower ridges 403 are arranged at intervals around the periphery of the lower hole 401; insert the pole 200 in the first component downwardly through the lower hole 401 until the plurality of upper ridges 402 are respectively embedded in the plurality of upper strip grooves 302, and the upper ridges 402 and the upper strip grooves 302 are fixed together to form a second component;

[0050] 3) Provide a top cover sheet 100, which is provided with a mounting hole 10 extending vertically therethrough. The top surface of the top cover sheet 100 has a mounting groove 101 formed as a downward depression. The mounting groove 101 is arranged around the periphery of the mounting hole 10 and is in communication with the mounting hole 10. The mounting groove 101 is provided with a plurality of lower strip grooves 102 formed as downward depressions. The plurality of lower strip grooves 102 are arranged at intervals around the periphery of the mounting hole 10. Insert the pole 200 in the second assembly downward through the mounting hole 10 until the plurality of lower ridges 403 are respectively embedded in the plurality of lower strip grooves 102. The lower ridges 403 and the lower strip grooves 102 cooperate and are fixed to each other to form a third assembly. The lower portion of the pole 200 is exposed below the top cover sheet 100.

[0051] 4) Provide a sealing ring 600 and a lower plastic part 700, and respectively sleeve the sealing ring 600 and the lower plastic part 700 on the outer periphery of the lower part of the pole 200 to form a fourth component;

[0052] 5) Provide a connecting piece 500 having an upwardly facing connecting surface and a connecting hole 501 extending vertically therethrough. Insert the pole 200 in the fourth component into the connecting hole 501 and simultaneously press it up and down until the bottom surface of the pole 200 is flush with the lower surface of the connecting piece 500. Then, weld the pole 200 and the connecting piece 500 to form a battery top cover.

[0053] The assembly method of the battery top cover assembly provided above is to weld the pole 200 and the pole block 300 into one piece first, then sequentially install multiple components of the battery top cover, and finally press the bottom surface of the pole 200 to be flush with the bottom surface of the connecting piece 500, so as to ensure that the multiple components are clamped and fixed between the connecting piece 500 and the pole block 300, the overall connection is stable, and the sealing ring 600 reaches a certain compression amount; at the same time, a lower strip groove 102 is provided in the installation groove 101, and an upper strip groove is provided on the pole block 300. 302, the upper plastic part 400 is provided with an upper ridge 402 and a lower ridge 403 corresponding to each other. The upper ridge 402 is embedded in the upper strip groove 302, and the lower ridge 403 is embedded in the lower strip groove 102, so that a stable connection is provided between the pole block 300, the upper plastic part 400 and the top cover sheet 100, and at the same time, the assembly between the upper plastic part 400, the top cover sheet 100 and the pole block 300 is facilitated, avoiding displacement during the assembly process, and effectively preventing loosening under external force environment to cause safety hazards.

[0054] The pole 200 is columnar, and from top to bottom, the pole 200 includes an upper section 201 that expands radially outward, a middle section 202, and a lower section 203 that contracts radially inward.

[0055] The upper section 201 is exposed above the top cover sheet 100, the middle section 202 passes through the mounting hole 10, and the lower section 203 is exposed in the direction of the top cover sheet 100. Along the axial direction, there is a step shape between the upper section 201 and the middle section 202, and there is a step shape between the middle section 202 and the lower section 203.

[0056] The upper portion of the upper hole 301 is radially recessed outward to form an upper stepped groove 3010, which is arranged in a circumferential pattern. In step 1), as the lower portion of the pole 200 is inserted into the upper hole 301, the upper section 201 fits into the upper stepped groove 3010, and the two fit together. This fit between the upper section 201 and the upper stepped groove 3010 ensures a well-positioned installation, effectively controlling the vertical relationship between the top of the upper section 201 and the top of the pole block 300.

[0057] Specifically, in step 2) and step 3), the middle section 202 passes through the lower hole 401 and the mounting hole 10 from top to bottom. In step 4), the sealing ring 600 is fixedly mounted on the outer periphery of the middle section 202 to ensure sealing performance.

[0058] The upper portion of the connecting hole 501 is radially recessed outward to form a lower step groove 5010 , which is arranged in a circular shape. In step 5), the bottom of the middle section 202 is embedded in the lower step groove 5010 , and the lower section 203 is embedded in the lower portion of the connecting hole 501 .

[0059] In this way, it plays a role in positioning and installation. When the upper and lower parts are pressed synchronously, after the bottom of the middle section 202 is pressed against the lower step groove 5010, the connecting piece 500 is abutted and cannot continue to move toward the top cover piece 100, thereby effectively controlling the compression amount of the sealing ring 600. At the same time, when welding between the bottom of the pole 200 and the connecting piece 500, it effectively protects the sealing ring 600, and the middle section 202 effectively prevents welding slag from falling onto the sealing ring 600 through the gap.

[0060] In step 5), a sealed gap is defined between the connecting surface and the top cover sheet 100. A sealing ring 600 is positioned within the sealed gap and clamped therein. A lower plastic member 700 is also positioned within the sealed gap, surrounding the outer periphery of the sealing ring 600. Lower plastic member 700 prevents contact between the top cover sheet 100 and the connecting sheet 500, preventing short circuits and making the overall structure more compact.

[0061] Specifically, the top cover plate 100 has a surrounding mounting wall that encloses the mounting hole 10. An annular gap is defined between the outer periphery of the pole 200 and the mounting wall. The top of the sealing ring 600 extends toward the annular gap to form an upper ring 610. In step 4), the upper ring 610 is embedded in the annular gap and clamped and fixed between the pole 200 and the top cover plate 100. This prevents contact between the pole 200 and the top cover plate 100, resulting in a more compact overall structure and improved sealing performance.

[0062] 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 4), the upper positioning post 720 is embedded in the upper positioning hole 20.

[0063] 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 downwardly protruding lower positioning column 710, and the connecting surface has a downwardly recessed lower positioning hole 502; in step 1), the lower positioning column 710 is embedded in the lower positioning hole 502.

[0064] 11 and 12 , the connecting piece 500 may be in a flat plate shape as shown in FIG. 11 , or may be bent, may be directly integrally formed by a mold as shown in FIG. 12 , or may be formed by two flat plates connected by a connecting structure.

[0065] The cooperation between the upper positioning post 720 and the upper positioning hole 20 plays the role of positioning the lower plastic part 700 on the top cover 100 , and the cooperation between the lower positioning post 710 and the lower positioning hole 502 plays the role of positioning the connecting piece 500 on the lower plastic part 700 .

[0066] In step 1), after the top surface of the pole 200 is flush with the top surface of the pole block 300, welding is performed along the entire circumference of the top of the pole 200 to securely connect the pole 200 and the pole block 300.

[0067] In step 5), after the bottom surface of the pole 200 is aligned with the lower surface of the connecting piece 500, welding is performed along the entire circumference of the bottom of the pole 200 to securely connect the pole 200 and the connecting piece 500. This ensures that the entire structure is fixed to each other and the sealing performance is guaranteed.

[0068] The outer periphery of the upper plastic part 400 extends upward to form an upper extension ring 410. The upper extension ring 410 is arranged along the circumference of the upper plastic part 400 to surround the mounting area. The bottom of the pole piece 300 has a lower protrusion 310 that protrudes downward and is embedded in the mounting area. The upper strip groove 302 is formed on the bottom of the lower protrusion 310. The upper protrusion 402 is formed in the surrounding area.

[0069] In step 2), the bottom of the pole piece 300 is pressed downwardly against the upper extension ring 410, and the lower protrusion 310 is embedded in the installation area. The lower protrusion 310 is installed in the installation area until the upper protrusion 402 is completely embedded in the upper strip groove 302. This ensures a more stable connection between the upper plastic component 400 and the pole piece 300, and a more stable overall structure.

[0070] In this embodiment, the upper extension ring 410 has an annular wall arranged toward the installation area, and an elastic ring 411 is provided on the annular wall and extends toward the installation area. The elastic ring 411 is arranged along the circumference of the annular wall. The outer periphery of the lower protrusion 310 has an outer peripheral wall in an annular shape, and an annular groove 311 is provided on the outer peripheral wall to form a radially inward depression. The annular groove 311 is arranged along the circumference of the outer peripheral wall.

[0071] In step 2), during the process of embedding the lower protrusion 310 into the installation area, the outer peripheral wall of the elastic ring 411 expands radially outward under the squeezing action, and the lower protrusion 310 continues to be embedded downward until the upper protrusion 402 is completely embedded in the upper strip groove 302. The elastic ring 411 is aligned with the annular groove 311, and the elastic ring 411 is elastically reset under the action of elastic force. The elastic ring 411 is embedded in the annular groove 311 to prevent the pole piece 300 from being disconnected under the action of axial force.

[0072] Through the design of the elastic ring 411, during the assembly process, it effectively prevents the stop block 300 from being displaced under the action of axial force. The cooperation between the upper protrusion 402 and the upper strip groove 302 prevents the lower pole block 300 from being displaced under the lateral force, making the assembly operation easier and the overall connection more compact and stable.

Claims

1. A method for assembling a battery top cover assembly, characterized in that: The assembly steps include: 1) Provide a pole block, wherein the middle of the pole block has an upper hole extending vertically therethrough, and the bottom of the pole block has a plurality of upper strip grooves recessed upward, wherein the plurality of upper strip grooves are arranged at intervals around the outer circumference of the upper hole; provide a pole column, insert the pole column downward and pass through the upper hole until the top surface of the pole column is flush with the top surface of the pole block, and then weld the pole column and the pole block to form a first assembly; 2) Provide an upper plastic part, wherein the middle part of the upper plastic part has a lower hole that passes through the upper and lower parts, the upper surface of the upper plastic part has a plurality of upper convex strips protruding upward, and the lower surface of the upper plastic part has a plurality of lower convex strips protruding downward, wherein the lower convex strips are arranged correspondingly to the upper convex strips, and the plurality of upper convex strips and lower convex strips are arranged at intervals around the outer periphery of the lower hole; insert the pole in the first component downward through the lower hole until the plurality of upper convex strips are respectively embedded in the plurality of upper strip grooves, and the upper convex strips and the upper strip grooves are fixedly matched with each other to form a second component; 3) Provide a top cover sheet, the top cover sheet is provided with a mounting hole penetrating from top to bottom, the upper surface of the top cover sheet is provided with a mounting groove formed by a downward depression, the mounting groove is arranged around the periphery of the mounting hole, and the mounting groove is connected to the mounting hole; the mounting groove is provided with a plurality of lower strip grooves formed by a downward depression, and the plurality of lower strip grooves are arranged at intervals around the periphery of the mounting hole; insert the pole in the second component downward through the mounting hole until the plurality of lower convex strips are respectively embedded in the plurality of lower strip grooves, the lower convex strips and the lower strip grooves are fixed with each other to form a third component; the lower part of the pole is exposed below the top cover sheet; 4) Provide a sealing ring and a lower plastic part, and respectively sleeve the sealing ring and the lower plastic part on the outer periphery of the lower part of the pole to form a fourth component; 5) Provide a connecting piece, the connecting piece has a connecting surface arranged upward, and the connecting surface is provided with a connecting hole penetrating from top to bottom. Insert the pole in the fourth component into the connecting hole and press it up and down simultaneously until the bottom surface of the pole is flush with the lower surface of the connecting piece, and then weld the pole and the connecting piece to form a battery top cover.

2. The method for assembling a battery top cover assembly according to claim 1, characterized in that: The pole is columnar, and along the direction from top to bottom, the pole includes an upper section that expands radially outward, a middle section, and a lower section that contracts radially inward; The upper section is exposed above the top cover sheet, the middle section passes through the mounting hole, and the lower section is exposed in the direction of the top cover sheet. Along the axial direction, there is a step shape between the upper section and the middle section, and there is a step shape between the middle section and the lower section; The upper portion of the upper hole is radially recessed outward to form an upper step groove, and the upper step groove is arranged in a circumferential shape; in the step 1), during the process of inserting the lower portion of the pole into the upper hole, the upper section is embedded in the upper step groove and cooperates with each other.

3. The method for assembling a battery top cover assembly according to claim 2, characterized in that: In step 2) and step 3), the middle section passes through the lower hole and the mounting hole from top to bottom, and in step 4), the sealing ring is fixedly sleeved on the outer periphery of the middle section.

4. The method for assembling a battery top cover assembly according to claim 3, characterized in that: The upper portion of the connecting hole is radially recessed outward to form a lower step groove, and the lower step groove is arranged in a circumferential shape; in the step 5), the bottom of the middle section is embedded in the lower step groove, and the lower section is embedded in the lower portion of the connecting hole.

5. The method for assembling a battery top cover assembly according to claim 1, characterized in that: In step 5), a sealing gap is provided between the connecting surface and the top cover sheet, the sealing ring is arranged in the sealing gap, and the sealing ring is clamped and fixed in the sealing gap; a lower plastic part is also arranged in the sealing gap, and the lower plastic part is arranged around the outer circumference of the sealing ring.

6. The method for assembling a battery top cover assembly according to claim 4, characterized in that: The top cover sheet has a surrounding mounting wall, the mounting wall encloses the mounting hole, an annular space is provided between the outer periphery of the pole and the mounting wall, the top of the sealing ring extends toward the annular space to form an upper ring; in step 4), the upper ring is embedded in the annular space and is clamped and fixed between the pole and the top cover sheet.

7. The method for assembling a battery top cover assembly 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 4), 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.

8. The method for assembling a battery top cover assembly according to claim 1, characterized in that: In the step 1), after the top surface of the pole is flush with the top surface of the pole block, welding is performed along the outer circumference of the top of the pole to fix the pole and the pole block; In the step 5), after the bottom surface of the pole is flush with the lower surface of the connecting piece, welding is performed along the outer circumference of the bottom of the pole to fix the pole and the connecting piece.

9. The method for assembling a battery top cover assembly according to any one of claims 1 to 8, 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 along the circumference of the upper plastic part, and the upper extension ring surrounds and forms a mounting area; the bottom of the pole block has a lower convex portion that protrudes downward and is embedded in the mounting area, the upper strip groove is formed on the bottom of the lower convex portion, and the upper convex strip is formed in the surrounding area; In step 2), the bottom of the pole block is pressed from top to bottom against the upper extension ring, the lower protrusion is embedded in the installation area, and the lower protrusion is cooperatively installed in the installation area until the upper protrusion is completely embedded in the upper strip groove.

10. The method for assembling a battery top cover assembly according to claim 9, characterized in that: The upper extension ring has an annular wall arranged toward the installation area, and an elastic ring extending toward the installation area is arranged on the annular wall, and the elastic ring is arranged around the circumference of the annular wall; the outer periphery of the lower convex portion has an outer peripheral wall in an encircling shape, and an annular groove formed by radially inward concave is arranged on the outer peripheral wall, and the annular groove is arranged around the circumference of the outer peripheral wall; In the step 2), during the process of embedding the lower convex portion into the installation area, the elastic ring expands radially outward under the squeezing action of the outer peripheral wall, and the lower convex portion continues to be embedded downward until the upper convex strip is completely embedded in the upper strip groove. The elastic ring is aligned with the annular groove, and the elastic ring is elastically reset under the action of elastic force. The elastic ring is embedded in the annular groove to prevent the pole block from being disconnected under the action of axial force.

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