Sealing rings for power batteries, assembly methods for power batteries, and power batteries

Abstract

This application discloses a sealing ring for a power battery, a power battery assembly method, and a power battery. The sealing ring includes an upper vertical edge, the bottom end of which bends inward to extend into a compression platform, the inner end of which bends downward to extend into a first connecting edge, the bottom end of which bends outward to extend into a support platform, and the outer end of which bends downward to extend into a lower vertical edge. The lower vertical edge is disposed between the side wall of the housing and the side wall of the core. The support platform and the compression platform abut against the inner protrusion of the housing extending between the support platform and the compression platform. The support platform is pressed against the current collector. The upper vertical edge is bent inward to clamp the outer edge of the top cover between the upper vertical edge and the compression platform, and is pressed downward by the edge portion formed at the top of the side wall of the housing. In this application, the sealing ring can replace an insulating gasket and a ring of insulating tape, simplifying the battery assembly structure, optimizing the battery assembly process, and facilitating the simplification of automated production line equipment and smooth production.

Description

Technical Field

[0001] This application relates to the field of power battery technology, and in particular to a sealing ring for a power battery, a power battery assembly method, and a power battery. Background Technology

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

[0003] To reduce costs and increase production capacity, more and more manufacturers are choosing mechanical (grooving) sealing structures for cylindrical batteries. However, the following technical problems exist:

[0004] (1) For cylindrical power battery mechanical (grooving) sealing structure, an insulating pad is generally required at the current collector position at the top of the core, and a ring of tape is attached around it for insulation. Due to the large number of structural components, the automated assembly line equipment is more complex.

[0005] (2) When the current collector and the insulating pad are covered with a strip of tape, the insulating pad is prone to lifting, resulting in poor tape application. When the current collector and the core are covered with a strip of tape first, and then the insulating pad is placed in, the edge of the pad is easily stuck by the tape, causing the insulating pad to be accidentally misaligned or poorly applied, which requires the automatic line equipment to be frequently stopped for adjustment / rework. Summary of the Invention

[0006] The purpose of this application is to provide a sealing ring for a power battery, a method for assembling a power battery, and a power battery, which can solve at least some of the technical problems existing in the background art.

[0007] To achieve the above objectives, this application provides a sealing ring for a power battery. The sealing ring is configured to be disposed at the top of the power battery. The power battery further includes a core, a current collector disposed at the top of the core, a housing covering the core, and a top cover. The sealing ring includes an annular upper vertical edge. The bottom end of the upper vertical edge bends inward to extend into a compression platform. The inner end of the compression platform bends downward to extend into a first connecting edge. The bottom end of the first connecting edge bends outward to extend into a support platform. The outer end of the support platform bends downward to extend into a lower vertical edge. The lower vertical edge is configured to be disposed between the side wall of the housing and the side wall of the core. The support platform and the compression platform are configured to abut against the inner protrusion of the housing extending between the support platform and the compression platform. The support platform is also configured to press against the current collector. The upper vertical edge is configured to be bent inward 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 portion formed at the top of the side wall of the housing.

[0008] In this embodiment, when the sealing ring is assembled to the power battery, the lower vertical edge is positioned between the side wall of the housing and the side wall of the core. The support platform and the compression platform abut against the inner protrusion on the side wall of the housing that extends between the support platform and the compression platform. The support platform is pressed against the current collector. The upper vertical edge is bent inward to clamp the outer edge of the top cover between the upper vertical edge and the compression platform and is pressed downward by the edge formed at the top of the side wall of the housing. Thus, the sealing ring can separate and insulate the current collector from the housing. Moreover, by the abutment of the support platform and the compression platform against the inner protrusion, and by the inward bending of the upper vertical edge to clamp the outer edge of the top cover between the upper vertical edge and the compression platform and being pressed downward by the edge formed at the top of the side wall of the housing, it is possible to reliably press the support platform against the current collector and reliably press the compression platform between the inner protrusion and the top cover, thereby locking the compression ratio of the compression platform. At the same time, the top cover can also be reliably clamped between the bent portion of the upper vertical edge and the compression platform. Therefore, the sealing ring of this application embodiment can replace the insulating gasket and a ring of insulating tape, simplifying the battery assembly structure, optimizing the battery assembly process, and facilitating the smooth operation of automated production lines. It also completely avoids the risk of frequent downtime for adjustment / rework caused by poor adhesive application on the top of the core or improper placement of the insulating gasket.

[0009] Optionally, the bottom end of the first connecting edge is bent inward and extends outward to the limiting platform, which is configured to press against the collector plate.

[0010] Optionally, the bottom end of the first connecting edge bends outward to extend 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 attached 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 collection plate.

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

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

[0013] Optionally, the second connecting edge is a sloping edge that slopes downwards from the inside out.

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

[0015] To achieve the above objectives, this application also provides a method for assembling a power battery, comprising the following steps:

[0016] The core is placed into the housing, the opening of the housing extends upward beyond the core, and a collector plate is welded to the top of the core;

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

[0018] An inner protrusion is machined on the side wall of the housing. The inner protrusion extends into the space between the compression platform and the support platform and supports the compression platform upward and downward, restricting the support platform from pressing against the manifold.

[0019] The top cover is assembled to the shell opening, and the outer edge of the top cover is pressed against the compression platform;

[0020] The top of the side wall of the housing is bent inward to form a edging portion, and the upper part of the upper vertical edge is bent to form a bent portion that is pressed downward by the edging portion. The outer edge of the top cover is sandwiched between the bent portion and the compression platform.

[0021] Based on the power battery assembly method of this application embodiment, the sealing ring can separate and insulate the current collector from the housing. Furthermore, by the contact between the support platform and the compression platform and the inner protrusion, 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 pressed downward by the edge portion formed on the top of the side wall of the housing. This ensures that the support platform is reliably pressed onto the current collector, and that the compression platform is reliably pressed between the inner protrusion and the top cover, achieving compression ratio locking of the compression platform. Simultaneously, the top cover can also be reliably clamped between the bent portion of the upper vertical edge and the compression platform. Therefore, the sealing ring of this application embodiment can replace the insulating gasket and a ring of insulating tape, simplifying the battery assembly structure, optimizing the battery assembly process, and facilitating the smooth operation of automated production lines. It completely avoids the risk of frequent downtime for adjustment / rework caused by poor adhesive application on the top of the core or improper placement of the insulating gasket.

[0022] To achieve the above objectives, this application also provides a method for assembling a power battery, comprising the following steps:

[0023] The core is placed into the housing, the opening of the housing extends upward beyond the core, and a collector plate is welded to the top of the core;

[0024] The sealing ring as described above is placed into the shell opening, wherein the lower vertical edge is inserted into the gap between the side wall of the shell and the core, the support platform and the limiting platform face the collecting plate, and the upper vertical edge is located inside the side wall of the shell;

[0025] An inner protrusion is machined on the side wall of the housing. The inner protrusion extends into the space between the compression platform and the support platform and supports the compression platform upward and downward, restricting the support platform from pressing against the manifold.

[0026] The top cover is assembled to the shell opening, and the outer edge of the top cover is pressed against the compression platform;

[0027] The top of the side wall of the housing is bent inward to form a edging portion. The upper part of the upper vertical edge is bent to form a bent portion that is pressed downward by the edging portion. The outer edge of the top cover is sandwiched between the bent portion and the compression platform. The sealing ring adaptively deforms so that both the limiting platform and the supporting platform are pressed onto the collector plate.

[0028] Based on the power battery assembly method of this application embodiment, the sealing ring can separate and insulate the current collector from the housing. Furthermore, through the contact between the support platform and the compression platform and the inner protrusion, the upper vertical edge is bent inward to clamp the outer edge of the top cover between the upper vertical edge and the compression platform, and is pressed downward by the edge portion formed on the top of the side wall of the housing. The adaptive deformation of the sealing ring ensures that the support platform and the limiting platform are reliably pressed onto the current collector, and that the compression platform is reliably pressed between the inner protrusion and the top cover, achieving compression ratio locking of the compression platform. Simultaneously, the top cover can also be reliably clamped between the bent portion of the upper vertical edge and the compression platform. Therefore, the sealing ring of this application embodiment can replace the insulating gasket and a ring of insulating tape, simplifying the battery assembly structure, optimizing the battery assembly process, and facilitating the smooth operation of automated production lines. It completely avoids the risk of frequent downtime for adjustment / rework caused by poor adhesive application on the top of the core or improper placement of the insulating gasket.

[0029] To achieve the above objectives, this application also provides a power battery, which is assembled using the assembly method described above.

[0030] In this application embodiment, the sealing ring of the power battery can replace the insulating gasket and a ring of insulating tape, simplifying the battery assembly structure, optimizing the battery assembly process, and facilitating the smooth operation of automated production lines. It also completely avoids the risk of frequent downtime for adjustment / rework caused by poor adhesive application on the top of the core or improper placement of the insulating gasket. Attached Figure Description

[0031] Figure 1 This is a three-dimensional structural diagram of a sealing ring used in a power battery according to an embodiment of this application.

[0032] Figure 2 This is a cross-sectional structural diagram of a sealing ring used in a power battery according to an embodiment of this application.

[0033] Figure 3 This is a cross-sectional structural schematic diagram of the sealing ring used for power batteries according to an embodiment of this application from another perspective.

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

[0035] Figure 5 This is a three-dimensional structural diagram of the power battery before it is sealed, according to an embodiment of this application.

[0036] Figure 6 yes Figure 5 A cross-sectional structural diagram of a power battery.

[0037] Figure 7 This is a three-dimensional structural diagram of a sealed power battery according to an embodiment of this application. Detailed Implementation

[0038] To illustrate the technical content, structural features, and effects of this application in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0039] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0040] Example 1

[0041] Please see Figures 1 to 7 This application discloses a sealing ring 10 for a power battery. The sealing ring 10 is configured to be disposed at the top of the power battery, which also includes a core 20, a current collector 30 disposed at the top of the core 20, a housing 40 covering the 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. The lower vertical edge 15 is configured to be disposed between the side wall 41 of the housing 40 and the side wall of the 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 housing 40 that extends between the support platform 14 and the compression platform 12. The support platform 14 is also configured to be pressed against the manifold 30. 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 is pressed downward by the edge portion 412 formed at the top of the side wall 41 of the housing 40.

[0043] In this embodiment, when the sealing ring 10 is assembled to the power battery, the lower vertical edge 15 is disposed between the side wall 41 of the housing 40 and the side wall of the core 20. The support platform 14 and the compression platform 12 abut against the inner protrusion 411 on the side wall 41 of the housing 40 that extends between the support platform 14 and the compression platform 12. The support platform 14 is pressed onto the collector plate 30. 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 pressed downward by the edge portion 412 formed at the top of the side wall 41 of the housing 40. Furthermore, the sealing ring 10 can separate and insulate the manifold 30 from the housing 40. Moreover, through the contact between the support platform 14 and the compression platform 12 and the inner protrusion 411, and the inward bending of the upper vertical edge 11, the outer edge of the top cover 50 is clamped between the upper vertical edge 11 and the compression platform 12 and pressed downward by the edge portion 412 formed at the top of the side wall 41 of the housing 40. This not only ensures that the support platform 14 is reliably pressed onto the manifold 30, but also that the compression platform 12 can be reliably pressed between the inner protrusion 411 and the top cover 50, thereby locking the compression ratio of the compression platform 12. At the same time, the top cover 50 can also be reliably clamped between the bent portion 111 of the upper vertical edge 11 and the compression platform 12. Therefore, the sealing ring 10 of this application embodiment can replace the insulating gasket and a ring of insulating tape, simplifying the battery assembly structure, optimizing the battery assembly process, and facilitating the smooth operation of automated production lines. It also completely avoids the risk of frequent downtime for adjustment / rework caused by poor adhesive application on the top of the core 20 or improper 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 inward and extends outward to the limiting platform 16, which is configured to press against the manifold 30. Since both the supporting platform 14 and the limiting platform 16 are pressed against the manifold 30, it is beneficial to achieve more reliable assembly of the sealing ring 10 and to achieve a better sealing effect.

[0047] Specifically, the bottom end of the first connecting edge 13 bends outward to extend 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 fitted to the outer edge of the top cover 50, the first connecting edge 13 and the second connecting edge 17 can adaptively deform, so that both the limiting platform 16 and the support platform 14 are pressed onto the collecting tray 30. By means of the adaptive deformation of the first connecting edge 13 and the second connecting edge 17 when the upper vertical edge 11 is bent and fitted to the outer edge of the top cover 50, it is ensured that both the limiting platform 16 and the support platform 14 are pressed onto the collecting tray 30 when the assembly is completed.

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

[0049] In a specific example, the included 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 hypotenuse that slopes downwards from the inside out. Of course, it is not limited to this.

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

[0052] In some embodiments, the sealing ring 10 is made of plastic materials such as PBT or PP. However, this is not a limitation.

[0053] In some embodiments, the power battery is a cylindrical power battery, wherein the core 20 is a cylindrical core and the casing 40 is a cylindrical casing. However, this is not a limitation.

[0054] Example 2

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

[0056] S11, the core 20 is placed into the housing 40, the opening of the housing 40 extends upward beyond the core 20 (that is, the side wall 41 of the housing 40 has a top end that extends upward beyond the core 20), and a collector plate 30 is welded to the top of the core 20.

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

[0058] S12, the sealing ring 10 is placed into the shell opening, wherein the lower vertical edge 15 is inserted into the gap between the side wall 41 of the shell 40 and the core 20 (around the top of the core 20 and the collector plate 30), the support platform 14 faces (at least partially faces) the collector plate 30, and the upper vertical edge 11 is located inside the side wall 41 of the shell 40.

[0059] Specifically, the upper vertical edge 11 is attached to the side wall 41 of the shell 40.

[0060] S13, an inner protrusion 411 is machined on the side wall 41 of the housing 40. The inner protrusion 411 extends into the space between the compression platform 12 and the support platform 14 and supports the compression platform 12 upward and the support platform 14 downward, restricting the support platform 14 to be pressed against the manifold 30.

[0061] Specifically, the inner protrusion 411 is formed by grooving.

[0062] Specifically, the inner convex part 411 is in the shape of a reclining U, with its upper and lower branches supporting the compression platform 12 upwards and the support platform 14 downwards, respectively.

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

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

[0065] Specifically, the upper part of the upper vertical edge 11 is passively bent when it bends inward at the top of the side wall 41 of the housing 40, but is not limited to this.

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

[0067] Based on the power battery assembly method of this application embodiment, the sealing ring 10 can separate and insulate the current collector 30 from the housing 40. Moreover, by the contact between the support platform 14 and the compression platform 12 and the inner protrusion 411, and the inward bending of the upper vertical edge 11, the outer edge of the top cover 50 is clamped between the upper vertical edge 11 and the compression platform 12 and pressed downward by the edge portion 412 formed on the top of the side wall 41 of the housing 40. This not only ensures that the support platform 14 is reliably pressed onto the current collector 30, but also that the compression platform 12 can be reliably pressed between the inner protrusion 411 and the top cover 50, thereby locking the compression ratio of the compression platform 12. At the same time, the top cover 50 can also be reliably clamped between the bent portion 111 of the upper vertical edge 11 and the compression platform 12. Therefore, the sealing ring 10 of this application embodiment can replace the insulating gasket and a ring of insulating tape, simplifying the battery assembly structure, optimizing the battery assembly process, and facilitating the smooth operation of automated production lines. It also completely avoids the risk of frequent downtime for adjustment / rework caused by poor adhesive application on the top of the core 20 or improper placement of the insulating gasket.

[0068] Example 3

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

[0070] S21, the core 20 is placed into the housing 40, the opening of the housing 40 extends upward beyond the core 20, and a collector plate 30 is welded to the top of the core 20.

[0071] S22, the sealing ring 10 is placed into the shell opening, wherein the lower vertical edge 15 is inserted into the gap between the side wall 41 of the shell 40 and the core 20, the support platform 14 and the limiting platform 16 face the collector plate 30, and the upper vertical edge 11 is located inside the side wall 41 of the shell 40.

[0072] S23, an inner protrusion 411 is machined on the side wall 41 of the housing 40. The inner protrusion 411 extends into the space between the compression platform 12 and the support platform 14 and supports the compression platform 12 upward and the support platform 14 downward, restricting the support platform 14 to be pressed against the collector plate 30.

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

[0074] S25, the top of the side wall 41 of the housing 40 is bent inward to form a edging portion 412, the upper part of the upper vertical edge 11 is bent to form a bent portion 111 that is pressed downward by the edging portion 412, the outer edge of the top cover 50 is sandwiched between the bent portion 111 and the compression platform 12, and the sealing ring 10 adapts to deformation so that the limiting platform 16 and the support platform 14 are both pressed onto the collector plate 30.

[0075] In a specific example, when the upper part of the upper vertical edge 11 is bent to form a bent part 111 that is pressed downward by the edge 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 support platform 14 are both pressed onto the collector plate 30.

[0076] Based on the power battery assembly method of this application embodiment, the sealing ring 10 can separate and insulate the current collector 30 from the housing 40. Moreover, through the contact between the support platform 14 and the compression platform 12 and the inner protrusion 411, the upper vertical edge 11 bends inward to clamp the outer edge of the top cover 50 between the upper vertical edge 11 and the compression platform 12 and is pressed downward by the edge portion 412 formed on the top of the side wall 41 of the housing 40, and the adaptive deformation of the sealing ring 10, it is possible to reliably press the support platform 14 and the limiting platform 16 onto the current collector 30, and also to reliably press the compression platform 12 between the inner protrusion 411 and the top cover 50, thereby achieving compression ratio locking of the compression platform 12. At the same time, the top cover 50 can also be reliably clamped between the bent portion 111 of the upper vertical edge 11 and the compression platform 12. Therefore, the sealing ring 10 of this application embodiment can replace the insulating gasket and a ring of insulating tape, simplifying the battery assembly structure, optimizing the battery assembly process, and facilitating the smooth operation of automated production lines. It also completely avoids the risk of frequent downtime for adjustment / rework caused by poor adhesive application on the top of the core 20 or improper placement of the insulating gasket.

[0077] Example 4

[0078] Please combine Figures 1 to 7 This application discloses a power battery. This power battery can be assembled using the assembly methods of Embodiment 2 or Embodiment 3.

[0079] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0080] The above-disclosed examples are merely preferred embodiments of this application, intended to facilitate understanding and implementation by those skilled in the art. They should not be construed as limiting the scope of this application. Therefore, any equivalent variations made in accordance with the scope of this application are still within the scope of this application.

Claims

1. A sealing ring for a power battery, the sealing ring being configured to be disposed at the top of the power battery, the power battery further comprising a winding core, a current collector disposed at the top of the winding core, a housing covering the winding core, and a top cover, characterized in that, The sealing ring includes an annular upper vertical edge, the bottom end of which bends inward to extend into a compression platform, the inner end of which bends downward to extend into a first connecting edge, the bottom end of which bends outward to extend into a support platform, and the outer end of which bends downward to extend into a lower vertical edge; wherein, the lower vertical edge is configured to be disposed between the side wall of the housing and the side wall of the core, the support platform and the compression platform are configured to abut against an inner protrusion on the side wall of the housing extending between the support platform and the compression platform, the support platform is further configured to press against the manifold, and the upper vertical edge is configured to be bent inward to clamp the outer edge of the top cover between the upper vertical edge and the compression platform and be pressed downward by the edging portion formed at the top of the side wall of the housing; The bottom end of the first connecting edge bends inward and extends outward to the limiting platform, which is configured to press against the collector plate; The bottom end of the first connecting edge bends outward to extend 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 attached 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 collection plate.

2. The sealing ring for a power battery according to claim 1, characterized in that, The first connecting edge is a sloping edge that slopes inward from top to bottom.

3. The sealing ring for a power battery according to claim 2, characterized in that, The included angle between the first connecting edge and the compression platform is between 91° and 135°.

4. The sealing ring for a power battery according to claim 2 or 3, characterized in that, The second connecting edge is a sloping edge that slopes downwards from the inside out.

5. The sealing ring for a power battery according to claim 4, characterized in that, The included angle between the second connecting edge and the supporting platform is between 20° and 50°.

6. A method for assembling a power battery, characterized in that, Includes the following steps: The core is placed into the housing, the opening of the housing extends upward beyond the core, and a collector plate is welded to the top of the core; The sealing ring according to any one of claims 1 to 5 is placed at the opening of the shell, wherein the lower vertical edge is inserted into the gap between the side wall of the shell and the core, the support platform and the limiting platform face the collecting plate, and the upper vertical edge is located inside the side wall of the shell; An inner protrusion is machined on the side wall of the housing. The inner protrusion extends into the space between the compression platform and the support platform and supports the compression platform upward and downward, restricting the support platform from pressing against the manifold. The top cover is assembled to the shell opening, and the outer edge of the top cover is pressed against the compression platform; The top of the side wall of the housing is bent inward to form a edging portion. The upper part of the upper vertical edge is bent to form a bent portion that is pressed downward by the edging portion. The outer edge of the top cover is sandwiched between the bent portion and the compression platform. The sealing ring adaptively deforms so that both the limiting platform and the supporting platform are pressed onto the collector plate.

7. A power battery, characterized in that, The power battery is assembled using the assembly method described in claim 6.

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