Sealing ring for power battery, assembly method of power battery and power battery

Abstract

The invention discloses a sealing ring for a power battery, an assembling method of the power battery and the power battery. The sealing ring comprises an upper vertical edge, the bottom end of the upper vertical edge is bent inwards and extends to form a compression platform, the inner end of the compression platform is bent downwards and extends to form a first connecting edge, the bottom end of the first connecting edge is bent outwards and extends to form a supporting platform, and the outer end of the supporting platform is bent downwards and extends to form a lower vertical edge; wherein the lower vertical edge is arranged between the side wall of the shell and the side wall of the roll core, the supporting platform and the compression platform abut against an inner protruding part of the shell extending into the position between the supporting platform and the compression platform, and the supporting platform is connected to the flow collecting disc in a pressing mode. The upper vertical edge is bent inwards so that the outer edge of the top cover can be clamped between the upper vertical edge and the compression platform, and the outer edge of the top cover is pressed downwards by an edge covering part formed at the top end of the side wall of the shell. In the application, the sealing ring can replace an insulating spacer and a circle of insulating tape, so that the battery assembly structure is simplified, the battery assembly process is optimized, and the simplification of automatic line equipment and smooth production are facilitated.

Description

Technical Field

[0001] The present application relates to the technical field of power batteries, and in particular to a sealing ring for a power battery, an assembly method for a power battery, and a power battery. Background Art

[0002] At present, lithium-ion / sodium-ion power batteries are gradually becoming the mainstream products in the new energy industry due to their high energy density, good capacity consistency, and support for high-rate charging and discharging.

[0003] In order to reduce costs and increase production capacity, more and more manufacturers are beginning to choose cylindrical battery mechanical (rolling groove) sealing structure. However, there are the following technical problems:

[0004] (1) Mechanical (groove rolling) sealing structure of cylindrical power batteries. Generally, an insulating gasket needs to be installed at the collector plate position on the top of the winding core, and a circle of tape is pasted around it for insulation. Due to the large number of structural parts, the automated assembly line equipment is more complicated.

[0005] (2) When the collector plate and the insulating gasket are taped together, the insulating gasket is prone to warping, resulting in poor gluing. When the winding core and the collector plate are taped together first and then the insulating gasket is placed, the edge of the gasket is easily adhered by the tape, resulting in accidental misalignment of the insulating gasket or poor gluing, which requires the automatic line equipment to be frequently shut down for adjustment / repair. Summary of the invention

[0006] The purpose of the present application is to provide a sealing ring for a power battery, an assembly method for a power battery and a power battery, which can solve at least part of the technical problems existing in the background technology.

[0007] In order to achieve the above-mentioned purpose, the present application provides a sealing ring for a power battery, the sealing ring is configured to be arranged at the top of the power battery, the power battery also includes a winding core, a current collecting disk arranged on the top of the winding core, a shell on which the winding core is sleeved, and a top cover, the sealing ring includes an annular upper vertical edge, the bottom end of the upper vertical edge is bent inwardly to extend a compression platform, the inner end of the compression platform is bent downwardly to extend a first connecting edge, the bottom end of the first connecting edge is bent outwardly to extend a support platform, and the outer end of the support platform is bent downwardly to extend a lower vertical edge; wherein, the lower vertical edge is configured to be arranged between the side wall of the shell and the side wall of the winding core, the support platform and the compression platform are configured to abut against the inner convex portion of the shell extending between the support platform and the compression platform, the support platform is also configured to be crimped onto the current collecting disk, the upper vertical edge is configured to be bent inwardly to clamp the outer edge of the top cover between the upper vertical edge and the compression platform and be crimped downward by the edging portion formed at the top end of the side wall of the shell.

[0008] When the sealing ring in the embodiment of the present application is assembled to the power battery, the lower vertical edge is arranged between the side wall of the shell and the side wall of the winding core, the support platform and the compression platform are in contact with the inner convex part on the side wall of the shell extending between the support platform and the compression platform, the support platform is pressed on the collector plate, and the upper vertical edge is bent inwardly to clamp the outer edge of the top cover between the upper vertical edge and the compression platform and is pressed downward by the edging part formed at the top of the side wall of the shell. Furthermore, the sealing ring can play the role of separating and insulating the collector plate from the shell, and by the abutment of the support platform and the compression platform with the inner convex part and the inward bending of the upper vertical edge, the outer edge of the top cover is clamped between the upper vertical edge and the compression platform and is pressed downward by the edging part formed at the top of the side wall of the shell, so that the support platform is reliably pressed on the collector plate, and the compression platform can be reliably pressed between the inner convex part and the top cover, so that the compression rate of the compression platform can be locked, and the top cover can also be reliably clamped between the bending part of the upper vertical edge and the compression platform. It can be seen that the sealing ring of the embodiment of the present application can replace the insulating gasket and a circle of insulating tape, simplify the battery assembly structure, optimize the battery assembly process, which is conducive to simplifying the automatic line equipment and the smooth progress of production, and completely avoids the risk of frequent shutdown adjustment / repair of the automatic line equipment due to poor gluing on the top of the core or poor placement of the insulating gasket.

[0009] Optionally, the bottom end of the first connecting edge is bent inwardly and extends out of a limiting platform, and the limiting platform is configured to be pressed onto the collecting plate.

[0010] Optionally, the bottom end of the first connecting edge is bent outward to extend outward to the second connecting edge, and the support platform extends outward from the end of the second connecting edge; when the upper vertical edge is bent and fitted to the outer edge of the top cover, the first connecting edge and the second connecting edge can adaptively deform so that the limiting platform and the support platform are both pressed onto the collecting plate.

[0011] Optionally, the first connecting edge is a beveled edge that slopes inward from top to bottom.

[0012] Optionally, the angle between the first connecting edge and the compression platform is between 91° and 135°.

[0013] Optionally, the second connecting edge is a beveled edge sloping downward from the inside to the outside.

[0014] Optionally, the angle between the second connecting edge and the supporting platform is between 20° and 50°.

[0015] In order to achieve the above object, the present application also provides a method for assembling a power battery, comprising the following steps:

[0016] Put the winding core into the shell, the shell opening of the shell is upwardly beyond the winding core, and a current collecting plate is welded on the top of the winding core;

[0017] Put the sealing ring as described above into the shell opening, wherein the lower vertical edge is inserted into the gap between the side wall of the shell and the winding core, the support platform faces the collecting plate, and the upper vertical edge is located on the inner side of the side wall of the shell;

[0018] An inner convex portion is processed on the side wall of the shell, the inner convex portion extends into the space between the compression platform and the support platform and supports the compression platform upward and supports the support platform downward, limiting the support platform from being pressed onto the collecting plate;

[0019] Assembling the top cover to the shell opening, with the outer edge of the top cover being crimped onto the compression platform;

[0020] The top end of the side wall of the shell is bent inward to form a rim portion, the upper portion of the upper vertical side is bent to form a bent portion pressed downward by the rim portion, and the outer edge of the top cover is clamped between the bent portion and the compression platform.

[0021] Based on the assembly method of the power battery of the embodiment of the present application, the sealing ring can play the role of isolating and insulating the current collecting disk from the shell, and the outer edge of the top cover is clamped between the upper vertical edge and the compression platform by the abutment of the support platform and the compression platform with the inner convex part and the inward bending of the upper vertical side, and is pressed downward by the edging part formed at the top of the side wall of the shell, which not only realizes the reliable crimping of the support platform on the current collecting disk, but also enables the compression platform to be reliably crimped between the inner convex part and the top cover, and the compression rate of the compression platform can be locked. At the same time, the top cover can also be reliably clamped between the bent part of the upper vertical side and the compression platform. It can be seen that the sealing ring of the embodiment of the present application can replace the insulating gasket and a circle of insulating tape, simplify the battery assembly structure, optimize the battery assembly process, and is conducive to simplifying the automatic line equipment and the smooth progress of production, and completely avoiding the risk of frequent shutdown adjustment / repair of the automatic line equipment due to poor gluing on the top of the winding core or poor placement of the insulating gasket.

[0022] In order to achieve the above object, the present application also provides a method for assembling a power battery, comprising the following steps:

[0023] Put the winding core into the shell, the shell opening of the shell is upwardly beyond the winding core, and a current collecting plate is welded on the top of the winding core;

[0024] Put the sealing ring as described above into the shell opening, wherein the lower vertical edge is inserted into the gap between the side wall of the shell and the winding core, the supporting platform and the limiting platform face the collecting plate, and the upper vertical edge is located on the inner side of the side wall of the shell;

[0025] An inner convex portion is processed on the side wall of the shell, the inner convex portion extends into the space between the compression platform and the support platform and supports the compression platform upward and supports the support platform downward, limiting the support platform from being pressed onto the collecting plate;

[0026] Assembling the top cover to the shell opening, with the outer edge of the top cover being crimped onto the compression platform;

[0027] The top end of the side wall of the shell is bent inward to form a edging portion, the upper portion of the upper vertical side is bent to form a bent portion that is pressed downward by the edging portion, the outer edge of the top cover is clamped between the bent portion and the compression platform, and the sealing ring adaptively deforms so that the limit platform and the support platform are both pressed onto the collecting plate.

[0028] Based on the assembly method of the power battery of the embodiment of the present application, the sealing ring can play the role of isolating and insulating the current collecting disk from the shell, and by virtue of the contact between the support platform and the compression platform and the inner convex part, the upper vertical side is bent inward to clamp the outer edge of the top cover between the upper vertical side and the compression platform and is pressed downward by the edging part formed at the top of the side wall of the shell, and the adaptive deformation of the sealing ring, it is achieved that the support platform and the limit platform are reliably pressed on the current collecting disk, and the compression platform can be reliably pressed between the inner convex part and the top cover, and the compression rate of the compression platform can be locked, and the top cover can also be reliably clamped between the bent part of the upper vertical side and the compression platform. It can be seen that the sealing ring of the embodiment of the present application can replace the insulating gasket and a circle of insulating tape, simplify the battery assembly structure, optimize the battery assembly process, and is conducive to simplifying the automatic line equipment and the smooth progress of production, and completely avoiding the risk of frequent shutdown adjustment / repair of the automatic line equipment due to poor gluing on the top of the winding core or poor placement of the insulating gasket.

[0029] In order to achieve the above-mentioned purpose, the present application also provides a power battery, which is assembled by the assembly method as described above.

[0030] The sealing ring of the power battery in the embodiment of the present application can replace the insulating gasket and a circle of insulating tape, simplify the battery assembly structure, optimize the battery assembly process, and help simplify the automatic line equipment and the smooth progress of production, and completely avoid the risk of frequent shutdown adjustment / repair of the automatic line equipment due to poor gluing on the top of the core or poor placement of the insulating gasket. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the three-dimensional structure of a sealing ring used for a power battery in an embodiment of the present application.

[0032] Figure 2 It is a schematic diagram of the cross-sectional structure of a sealing ring used for a power battery in an embodiment of the present application.

[0033] Figure 3 It is a schematic diagram of the cross-sectional structure of the sealing ring used for the power battery in the embodiment of the present application from another perspective.

[0034] Figure 4 yes Figure 3 Enlarged view of part A in the middle.

[0035] Figure 5 It is a schematic diagram of the three-dimensional structure of the power battery that has not yet been sealed in the embodiment of the present application.

[0036] Figure 6 yes Figure 5 Schematic diagram of the cross-sectional structure of the power battery.

[0037] Figure 7 is a schematic diagram of the three-dimensional structure of a sealed power battery in an embodiment of the present application, DETAILED DESCRIPTION

[0038] In order to explain the technical content, structural features, and achieved effects of the present application in detail, the following is a detailed description in conjunction with the implementation methods and the accompanying drawings.

[0039] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0040] Embodiment 1

[0041] See also Figures 1 to 7 The present application discloses a sealing ring 10 for a power battery. The sealing ring 10 is configured to be arranged at the top of the power battery. The power battery also includes a winding core 20, a current collecting plate 30 arranged on the top of the winding core 20, a shell 40 sleeved with the winding core 20, and a top cover 50.

[0042] The sealing ring 10 includes an annular upper vertical edge 11, the bottom end of the upper vertical edge 11 is bent inward to extend a compression platform 12, the inner end of the compression platform 12 is bent downward to extend a first connecting edge 13, the bottom end of the first connecting edge 13 is bent outward to extend a support platform 14, and the outer end of the support platform 14 is bent downward to extend a lower vertical edge 15; wherein the lower vertical edge 15 is configured to be arranged between the side wall 41 of the shell 40 and the side wall of the winding core 20, the support platform 14 and the compression platform 12 are configured to abut against the inner protrusion 411 on the side wall 41 of the shell 40 extending between the support platform 14 and the compression platform 12, the support platform 14 is also configured to be crimped onto the collecting plate 30, and the upper vertical edge 11 is configured to be bent inward to clamp the outer edge of the top cover 50 between the upper vertical edge 11 and the compression platform 12 and be crimped downward by the edging portion 412 formed at the top end of the side wall 41 of the shell 40.

[0043] When the sealing ring 10 in the embodiment of the present application is assembled to the power battery, the lower vertical edge 15 is arranged between the side wall 41 of the shell 40 and the side wall of the winding core 20, the support platform 14 and the compression platform 12 are abutted against the inner protrusion 411 on the side wall 41 of the shell 40 extending between the support platform 14 and the compression platform 12, the support platform 14 is crimped on the collecting plate 30, and the upper vertical edge 11 is bent inward to clamp the outer edge of the top cover 50 between the upper vertical edge 11 and the compression platform 12 and is crimped downward by the edging portion 412 formed at the top end of the side wall 41 of the shell 40. Furthermore, the sealing ring 10 can serve to separate and insulate the collecting plate 30 from the shell 40, and the outer edge of the top cover 50 is clamped between the upper vertical edge 11 and the compression platform 12 by the abutment between the support platform 14 and the compression platform 12 and the inner protrusion 411 and the inward bending of the upper vertical side 11, and is pressed downward by the edging portion 412 formed at the top end of the side wall 41 of the shell 40, so that the support platform 14 can be reliably crimped on the collecting plate 30, and the compression platform 12 can be reliably crimped between the inner protrusion 411 and the top cover 50, so that the compression rate of the compression platform 12 can be locked, and at the same time, the top cover 50 can also be reliably clamped between the bending portion 111 of the upper vertical side 11 and the compression platform 12. It can be seen that the sealing ring 10 of the embodiment of the present application can replace the insulating gasket and a circle of insulating tape, simplify the battery assembly structure, optimize the battery assembly process, which is conducive to simplifying the automatic line equipment and the smooth progress of production, and completely avoids the risk of frequent shutdown adjustment / repair of the automatic line equipment due to poor gluing on the top of the winding core 20 or poor placement of the insulating gasket.

[0044] In some embodiments, the thickness T of the compression platform 12 is between 0.8 mm and 1.2 mm.

[0045] In some embodiments, the thickness W of the lower vertical edge 15 is between 0.15 mm and 0.6 mm.

[0046] In some embodiments, the bottom end of the first connecting edge 13 is bent inwardly to extend out of the limiting platform 16, and the limiting platform 16 is configured to be pressed on the current collecting plate 30. Since the supporting platform 14 and the limiting platform 16 are both pressed on the current collecting plate 30, it is conducive to more reliable assembly of the sealing ring 10 and better sealing ring 10 effect can be achieved.

[0047] Specifically, the bottom end of the first connecting edge 13 is bent outward to extend to the second connecting edge 17, and the support platform 14 extends outward from the end of the second connecting edge 17; when the upper vertical edge 11 is bent and attached to the outer edge of the top cover 50, the first connecting edge 13 and the second connecting edge 17 can be adaptively deformed, so that the limiting platform 16 and the support platform 14 are both pressed on the current collecting plate 30. When the upper vertical edge 11 is bent and attached to the outer edge of the top cover 50, the first connecting edge 13 and the second connecting edge 17 are adaptively deformed, ensuring that the limiting platform 16 and the support platform 14 are both pressed on the current collecting plate 30 when the assembly is completed.

[0048] Specifically, the first connecting edge 13 is a beveled edge that is inclined inward from top to bottom. Of course, this is not limited to this.

[0049] In a specific example, the angle r2 between the first connecting edge 13 and the compression platform 12 is between 91° and 135°.

[0050] Specifically, the second connecting edge 17 is a beveled edge that slopes downward from the inside to the outside. Of course, this is not limited to this.

[0051] In a specific example, the angle r1 between the second connecting edge 17 and the supporting platform 14 is between 20° and 50°.

[0052] In some embodiments, the sealing ring 10 is made of plastic materials such as PBT and PP, but is not limited thereto.

[0053] In some embodiments, the power battery is a cylindrical power battery, wherein the winding core 20 is a cylindrical winding core, and the shell 40 is a cylindrical shell, but this is not limited thereto.

[0054] Embodiment 2

[0055] Please combine Figures 1 to 7 The present application discloses a method for assembling a power battery, comprising the following steps:

[0056] S11, the winding core 20 is placed in the shell 40, the shell opening of the shell 40 extends upward beyond the winding core 20 (that is, the side wall 41 of the shell 40 has a top end extending upward beyond the winding core 20), and the collecting plate 30 is welded on the top of the winding core 20.

[0057] Specifically, a full-pole tab is formed on the top of the winding core 20 , and the current collecting plate 30 is welded on the full-pole tab.

[0058] S12, place the sealing ring 10 into the shell opening, with the lower vertical edge 15 inserted into the gap between the side wall 41 of the shell 40 and the winding core 20 (around the top of the winding core 20 and the collecting plate 30), the supporting platform 14 facing (at least partially facing) the collecting plate 30, and the upper vertical edge 11 located on the inner side of the side wall 41 of the shell 40.

[0059] Specifically, the upper vertical side 11 is in contact with the side wall 41 of the housing 40 .

[0060] S13, an inner convex portion 411 is processed on the side wall 41 of the shell 40, and the inner convex portion 411 extends into the space between the compression platform 12 and the support platform 14 and supports the compression platform 12 upward and supports the support platform 14 downward, limiting the support platform 14 from being crimped onto the collecting plate 30.

[0061] Specifically, the inner convex portion 411 is formed by rolling grooves.

[0062] Specifically, the inner convex portion 411 is in a lying U-shape, and its upper and lower branches support the compression platform 12 upward and the support platform 14 downward respectively.

[0063] S14, assembling the top cover 50 to the shell opening, and crimping the outer edge of the top cover 50 onto the compression platform 12.

[0064] S15, bend the top end of the side wall 41 of the shell 40 inward to form a edging portion 412, the upper portion of the upper vertical edge 11 is bent to form a bending portion 111 which is pressed downward by the edging portion 412, and the outer edge of the top cover 50 is clamped between the bending portion 111 and the compression platform 12.

[0065] Specifically, the upper portion of the upper vertical side 11 is passively bent when the top end of the side wall 41 of the housing 40 is bent inwardly, but the present invention is not limited thereto.

[0066] After this step is completed, the sealing of the power battery is completed.

[0067] Based on the assembly method of the power battery of the embodiment of the present application, the sealing ring 10 can separate and insulate the collecting plate 30 from the shell 40, and the outer edge of the top cover 50 is clamped between the upper vertical edge 11 and the compression platform 12 by the abutment between the support platform 14 and the compression platform 12 and the inner protrusion 411 and the inward bending of the upper vertical side 11, and is pressed downward by the edging portion 412 formed at the top end of the side wall 41 of the shell 40, so that the support platform 14 can be reliably pressed onto the collecting plate 30, and the compression platform 12 can be reliably pressed between the inner protrusion 411 and the top cover 50, so that the compression rate of the compression platform 12 can be locked, and at the same time, the top cover 50 can also be reliably clamped between the bending portion 111 of the upper vertical side 11 and the compression platform 12. It can be seen that the sealing ring 10 of the embodiment of the present application can replace the insulating gasket and a circle of insulating tape, simplify the battery assembly structure, optimize the battery assembly process, which is conducive to simplifying the automatic line equipment and the smooth progress of production, and completely avoids the risk of frequent shutdown adjustment / repair of the automatic line equipment due to poor gluing on the top of the winding core 20 or poor placement of the insulating gasket.

[0068] Embodiment 3

[0069] Please combine Figures 1 to 7 The present application discloses a method for assembling a power battery, comprising the following steps:

[0070] S21 , placing the winding core 20 into the shell 40 , with the shell opening of the shell 40 extending upward beyond the winding core 20 , and a current collecting plate 30 being welded on the top of the winding core 20 .

[0071] S22, place the sealing ring 10 into the shell opening, with the lower vertical edge 15 inserted into the gap between the side wall 41 of the shell 40 and the winding core 20, the supporting platform 14 and the limiting platform 16 facing the collecting plate 30, and the upper vertical edge 11 located on the inner side of the side wall 41 of the shell 40.

[0072] S23, an inner convex portion 411 is processed on the side wall 41 of the shell 40, and the inner convex portion 411 extends into the space between the compression platform 12 and the support platform 14 and supports the compression platform 12 upward and supports the support platform 14 downward, limiting the support platform 14 from being crimped onto the collecting plate 30.

[0073] S24, assembling the top cover 50 to the shell opening, and crimping the outer edge of the top cover 50 onto the compression platform 12.

[0074] S25, the top end of the side wall 41 of the shell 40 is bent inward to form a edging portion 412, the upper portion of the upper vertical edge 11 is bent to form a bending portion 111 which is pressed downward by the edging portion 412, the outer edge of the top cover 50 is clamped between the bending portion 111 and the compression platform 12, and the sealing ring 10 is adaptively deformed so that the limiting platform 16 and the supporting platform 14 are both pressed onto the collecting plate 30.

[0075] In a specific example, when the upper portion of the upper vertical edge 11 is bent to form a bent portion 111 that is pressed downward by the edging portion 412 , the first connecting edge 13 and the second connecting edge 17 of the sealing ring 10 adaptively deform so that the limiting platform 16 and the supporting platform 14 are both pressed onto the collecting plate 30 .

[0076] Based on the assembly method of the power battery of the embodiment of the present application, the sealing ring 10 can play the role of separating and insulating the collecting plate 30 from the shell 40, and through the abutment between the support platform 14 and the compression platform 12 and the inner protrusion 411, the upper vertical side 11 is bent inward to clamp the outer edge of the top cover 50 between the upper vertical side 11 and the compression platform 12 and is pressed downward by the edging portion 412 formed at the top end of the side wall 41 of the shell 40, as well as the adaptive deformation of the sealing ring 10, which not only realizes the reliable crimping of the support platform 14 and the limiting platform 16 on the collecting plate 30, but also enables the compression platform 12 to be reliably crimped between the inner protrusion 411 and the top cover 50, so that the compression rate of the compression platform 12 can be locked, and at the same time, the top cover 50 can also be reliably clamped between the bending portion 111 of the upper vertical side 11 and the compression platform 12. It can be seen that the sealing ring 10 of the embodiment of the present application can replace the insulating gasket and a circle of insulating tape, simplify the battery assembly structure, optimize the battery assembly process, which is conducive to simplifying the automatic line equipment and the smooth progress of production, and completely avoids the risk of frequent shutdown adjustment / repair of the automatic line equipment due to poor gluing on the top of the winding core 20 or poor placement of the insulating gasket.

[0077] Embodiment 4

[0078] Please combine Figures 1 to 7 The present application discloses a power battery. The power battery can be assembled by the assembly method of the second embodiment or the third embodiment.

[0079] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0080] The above disclosure is only a preferred example of the present application, and its role is to facilitate the technical personnel in this field to understand and implement it. Of course, it cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made according to the scope of the patent application of the present application still fall within the scope covered by the present application.

Claims

1. A sealing ring for a power battery, the sealing ring being configured to be arranged at the top of the power battery, the power battery further comprising a winding core, a current collecting plate arranged at the top of the winding core, a shell sleeved with the winding core, and a top cover, characterized in that: The sealing ring includes an annular upper vertical edge, the bottom end of the upper vertical edge is bent inwardly to extend a compression platform, the inner end of the compression platform is bent downwardly to extend a first connecting edge, the bottom end of the first connecting edge is bent outwardly to extend a support platform, and the outer end of the support platform is bent downwardly to extend a lower vertical edge; wherein, the lower vertical edge is configured to be arranged between the side wall of the shell and the side wall of the winding core, the support platform and the compression platform are configured to abut against the inner protrusion on the side wall of the shell extending between the support platform and the compression platform, the support platform is also configured to be crimped onto the collecting plate, and the upper vertical edge is configured to be bent inwardly to clamp the outer edge of the top cover between the upper vertical edge and the compression platform and be crimped downward by the edging portion formed at the top end of the side wall of the shell.

2. The sealing ring for a power battery according to claim 1, characterized in that: The bottom end of the first connecting edge is bent inwardly to extend out of a limiting platform, and the limiting platform is configured to be pressed onto the current collecting plate.

3. The sealing ring for a power battery according to claim 2, characterized in that: The bottom end of the first connecting edge is bent outward to extend outward to form a second connecting edge, and the support platform extends outward from the end of the second connecting edge; when the upper vertical edge is bent and fitted to the outer edge of the top cover, the first connecting edge and the second connecting edge can adaptively deform so that the limiting platform and the support platform are both pressed onto the collecting plate.

4. The sealing ring for a power battery according to claim 3, characterized in that: The first connecting edge is a beveled edge that slopes inward from top to bottom.

5. The sealing ring for a power battery according to claim 4, characterized in that: The included angle between the first connecting edge and the compression platform is between 91° and 135°.

6. The sealing ring for a power battery according to claim 4 or 5, characterized in that: The second connecting edge is a beveled edge that slopes downward from the inside to the outside.

7. The sealing ring for a power battery according to claim 6, characterized in that: The included angle between the second connecting edge and the supporting platform is between 20° and 50°.

8. A method for assembling a power battery, characterized in that: The steps include: Put the winding core into the shell, the shell opening of the shell is upwardly beyond the winding core, and a current collecting plate is welded on the top of the winding core; Place the sealing ring according to any one of claims 1 to 7 into the shell opening, wherein the lower vertical edge is inserted into the gap between the side wall of the shell and the winding core, the support platform faces the collecting plate, and the upper vertical edge is located on the inner side of the side wall of the shell; An inner convex portion is processed on the side wall of the shell, the inner convex portion extends into the space between the compression platform and the support platform and supports the compression platform upward and supports the support platform downward, limiting the support platform from being pressed onto the collecting plate; Assembling the top cover to the shell opening, with the outer edge of the top cover being crimped onto the compression platform; The top end of the side wall of the shell is bent inward to form a rim portion, the upper portion of the upper vertical side is bent to form a bent portion pressed downward by the rim portion, and the outer edge of the top cover is clamped between the bent portion and the compression platform.

9. A method for assembling a power battery, characterized in that: The steps include: Put the winding core into the shell, the shell opening of the shell is upwardly beyond the winding core, and a current collecting plate is welded on the top of the winding core; Place the sealing ring according to any one of claims 2 to 7 into the shell opening, wherein the lower vertical edge is inserted into the gap between the side wall of the shell and the winding core, the supporting platform and the limiting platform face the collecting plate, and the upper vertical edge is located on the inner side of the side wall of the shell; An inner convex portion is processed on the side wall of the shell, the inner convex portion extends into the space between the compression platform and the support platform and supports the compression platform upward and supports the support platform downward, limiting the support platform from being pressed onto the collecting plate; Assembling the top cover to the shell opening, with the outer edge of the top cover being crimped onto the compression platform; The top end of the side wall of the shell is bent inward to form a edging portion, the upper portion of the upper vertical side is bent to form a bent portion that is pressed downward by the edging portion, the outer edge of the top cover is clamped between the bent portion and the compression platform, and the sealing ring adaptively deforms so that the limit platform and the support platform are both pressed onto the collecting plate.

10. A power battery, characterized in that: The power battery is assembled by the assembly method as described in claim 8 or 9.

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