Shell assembly for power battery and power battery

Abstract

The invention discloses a shell assembly for a power battery and the power battery. The shell assembly comprises a shell, a sealing nail, a sealing piece and a fixing ring, a sealing nail groove is formed in the upper surface of the shell, and a pressure relief through hole is eccentrically formed in the bottom wall of the sealing nail groove; the sealing nail is rotatably arranged in the sealing nail groove, an exhaust through hole is formed in the sealing nail, a sealing piece groove is concavely formed in the bottom wall of the sealing nail, and the top wall of the sealing piece groove comprises a first area and a second area; the sealing element is assembled in the sealing element groove, the part, corresponding to the first area, of the sealing element has a first compression ratio, the part, corresponding to the second area, of the sealing element has a second compression ratio, and the first compression ratio is smaller than the second compression ratio; rotation of the sealing nail enables the part, with the first compression ratio, of the sealing piece to move to cover the pressure relief through hole, the sealing piece allows pressure relief gas to flow from the pressure relief through hole to the exhaust through hole and enables the part, with the second compression ratio, of the sealing piece to move to cover the pressure relief through hole. According to the invention, switching of pressure relief and pressure stop of the power battery is realized.

Description

Technical Field

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

[0002] At present, lithium-ion / sodium-ion cylindrical power batteries have gradually become the mainstream products in the new energy industry due to their high energy density, good capacity consistency, and ability to support high-rate charging and discharging. With the popularization of new energy vehicles, people have put forward higher requirements for fast charging travel (i.e., high-rate fast charging of power batteries). At the same time, more and more manufacturers have begun to explore the shell bottom penetration welding process to solve the demand for fast charging travel. However, there are the following common problems:

[0003] 1. During the cyclic charge and discharge process of cylindrical power batteries, the positive / negative electrode material system will gradually produce gas, or the internal pressure will gradually increase under high-rate charge and discharge / high-temperature conditions, causing deformation of the battery appearance or posing safety risks to the battery, ultimately affecting the battery life.

[0004] 2. As people's demand for long-lasting power batteries emerges, many battery manufacturers have begun to explore / introduce positive / negative electrode material systems with higher gas production but higher energy density. However, the greater the gas production of the battery, the more new safety risks will arise.

[0005] 3. The existing structural design of cylindrical power batteries, if directly introduced into the existing pressure relief structure to exhaust and relieve pressure, due to leakage, the internal pressure cannot be increased, resulting in the inability to open the explosion-proof valve. Summary of the invention

[0006] The purpose of the present application is to provide a housing for a power battery and a power battery, which can solve at least one technical problem in the above background.

[0007] In order to achieve the above-mentioned purpose, the present application provides a shell assembly for a power battery, the shell assembly includes a shell, a rotatable sealing pin, a seal and a fixing ring, the upper surface of the shell is provided with a sealing pin groove, the bottom wall of the sealing pin groove is eccentrically provided with a pressure relief through hole; the sealing pin is rotatably arranged in the sealing pin groove, the sealing pin is provided with an exhaust through hole penetrating up and down, the bottom wall of the sealing pin is recessed upwardly with a sealing groove, the top wall of the sealing groove includes a first area and a second area, the first area is higher than the second area; the seal is assembled in the sealing groove and is crimped between the top wall of the sealing groove and the bottom wall of the sealing pin groove. The portion of the seal corresponding to the first area has a first compression rate, and the portion of the seal corresponding to the second area has a second compression rate, and the first compression rate is less than the second compression rate; the outer side of the fixing ring is fixedly connected to the side wall of the sealing pin groove, and the inner side of the fixing ring limits the sealing pin in the up and down directions and radial directions and allows the sealing pin to rotate along it, and the rotation of the sealing pin can make the portion of the seal with the first compression rate move to cover the pressure relief through hole, and the seal allows the pressure relief gas to flow from the pressure relief through hole to the exhaust through hole, and makes the portion of the seal with the second compression rate move to cover the pressure relief through hole.

[0008] Optionally, the top wall of the sealing groove is divided into the first area, the second area and a third area smoothly connected between the first area and the second area, the first area and the second area are planes parallel to the bottom wall of the sealing nail groove, and the third area is a smooth curved surface.

[0009] Optionally, the sealing member is a sealing ring, an anti-rotation limiting protrusion is formed in the middle of the sealing member groove, the sealing ring is tightly sleeved on the anti-rotation limiting protrusion, and the exhaust through hole is formed at the anti-rotation limiting protrusion.

[0010] Optionally, a circular sliding protrusion is protruding downward from the outer periphery of the bottom of the sealing pin, and the bottom of the sliding protrusion is in smooth contact with the bottom wall of the sealing pin groove.

[0011] Optionally, the sliding protrusion is in linear contact with the bottom wall of the sealing pin groove.

[0012] Optionally, a pointer mark is provided on the upper surface of the sealing pin, and a first state mark and a second state mark are provided on the upper surface of the shell at a position close to the sealing pin groove, the first state mark and the second state mark are located at different positions in the rotation direction of the sealing pin, and when the sealing pin is rotated until the pointer mark is aligned with the first state mark, the part of the seal with the first compression rate moves to cover the pressure relief through hole and the seal allows the pressure relief gas to flow from the pressure relief through hole to the exhaust through hole, and when the sealing pin is rotated until the pointer mark is aligned with the second state mark, the part of the seal with the second compression rate moves to cover the pressure relief through hole.

[0013] Optionally, the side wall of the sealing pin forms a first inverted cone surface, and the inner side wall of the fixing ring forms a second inverted cone surface matched with the first inverted cone surface, the first inverted cone surface has a plurality of first hemispherical grooves distributed along its circumference, the first inverted cone surface has a plurality of hemispherical grooves distributed along its circumference, and hard spheres are respectively fitted and installed in the plurality of hemispherical grooves, and the second inverted cone surface is provided with an annular groove with a semicircular cross-section matched with the hard sphere, and when the fixing ring is assembled in the sealing pin groove, the plurality of hard spheres and the annular groove are fitted and installed, the plurality of hard spheres crimp and limit the sealing pin, and the compression rate of the seal is locked.

[0014] Optionally, a circle of bosses is protruded upward from the outer edge of the bottom wall of the sealing nail groove, and the lower surface of the fixing ring is attached to the bosses.

[0015] Optionally, the side wall of the sealing pin groove and the outer side wall of the fixing ring are matching conical surfaces.

[0016] In order to achieve the above-mentioned objectives, the present application also provides a power battery, including the shell assembly for the power battery as described above.

[0017] When the housing assembly of the embodiment of the present application is used in a power battery, when the power battery is circulated for a long time and the internal gas production is large, resulting in a high internal air pressure, the portion of the seal with a first compression rate can be driven to move to cover the pressure relief through hole by rotating the sealing nail. At this time, the seal allows the pressure relief gas in the power battery to flow from the pressure relief through hole to the exhaust through hole. After the pressure relief is completed, the portion of the seal with a second compression rate can be driven to move to cover the pressure relief through hole by rotating the sealing nail, so as to stop the pressure of the power battery, that is, to re-achieve the sealing with a high compression rate. The present application can effectively eliminate the problem of increased internal pressure caused by slow gas production of the power battery, can realize the switching between pressure relief and pressure stopping of the power battery, can extend the life of the power battery and improve the safety of the power battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1It is a schematic diagram of the three-dimensional structure of the power battery of an embodiment of the present application.

[0019] Figure 2 yes Figure 1 Enlarged view of part A in the middle.

[0020] Figure 3 It is a cross-sectional schematic diagram of the local structure of the power battery of an embodiment of the present application.

[0021] Figure 4 It is a schematic diagram of the cross-sectional structure of the power battery of an embodiment of the present application from another perspective.

[0022] Figure 5 yes Figure 4 Enlarged view of part B in the middle.

[0023] Figure 6 It is a schematic diagram of the partial structure of the shell of the embodiment of the present application.

[0024] Figure 7 It is a cross-sectional schematic diagram of the local structure of the shell of the embodiment of the present application.

[0025] Figure 8 It is a schematic diagram of the three-dimensional structure of the sealing nail according to the embodiment of the present application.

[0026] Fig. 9 It is a schematic diagram of the three-dimensional structure of the sealing nail in another perspective of the embodiment of the present application.

[0027] Fig.10 It is a schematic diagram of the three-dimensional structure of the sealing ring of the embodiment of the present application when it is in a compressed state.

[0028] Fig.11 It is a schematic diagram of the three-dimensional structure of the fixing ring of the embodiment of the present application.

[0029] Fig.12 It is a schematic diagram of the cross-sectional structure of the fixing ring of the embodiment of the present application. DETAILED DESCRIPTION

[0030] 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.

[0031] 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.

[0032] See also Figures 1 to 12The embodiment of the present application discloses a housing assembly for a power battery, the housing assembly comprising a housing 10, a rotatable sealing pin 20, a sealing member 30 and a fixing ring 40, a sealing pin groove 11 is provided on the upper surface of the housing 10, and a pressure relief through hole 12 is eccentrically provided on the bottom wall of the sealing pin groove 11; the sealing pin 20 is rotatably arranged in the sealing pin groove 11, and an exhaust through hole 21 penetrating from top to bottom is provided on the sealing pin 20, a sealing member groove 22 is concavely provided on the bottom wall of the sealing pin 20, and the top wall of the sealing member groove 22 comprises a first area 221 and a second area 222, and the first area 221 is higher than the second area 222; the sealing member 30 is assembled in the sealing member groove 22 and is crimped to the top wall of the sealing member groove 22 and the bottom wall of the sealing member groove 11 The portion of the seal 30 corresponding to the first area 221 has a first compression rate, and the portion of the seal 30 corresponding to the second area 222 has a second compression rate, and the first compression rate is less than the second compression rate; the outer side of the fixing ring 40 is fixedly connected to the side wall of the sealing pin groove 11, and the inner side of the fixing ring 40 limits the sealing pin 20 in the up and down directions and radial directions and allows the sealing pin 20 to rotate along it, and the rotation of the sealing pin 20 can make the portion of the seal 30 with the first compression rate (corresponding to the first area 221) move to cover the pressure relief hole 12 and the seal 30 allows the pressure relief gas to flow from the pressure relief hole 12 to the exhaust hole 21 and makes the portion of the seal 30 with the second compression rate (corresponding to the second area 222) move to cover the pressure relief hole 12.

[0033] It is understandable that when the portion with the first compression rate covers the pressure relief hole 12, it can prevent external air from entering the power battery, that is, it can block the free flow of normal pressure air. The approximate data of the first compression rate and the second compression rate can be set as needed by setting the height of the first area 221 and the second area 222, the thickness of the seal 30, etc. For example, the first compression rate can be that after the air pressure accumulated inside the power battery reaches a certain value, it can break through the obstruction of the portion of the seal 30 with the first compression rate and flow out to the exhaust hole 21. As for the second compression rate, it is understandable that it needs to be large enough to reliably prevent the high-pressure gas after the power battery is cycled for a long time. The pressure relief gas can be a gas with a pressure exceeding a certain value.

[0034] Combination Figure 1 Specifically, the thickness of the portion of the seal 30 corresponding to the first region 221 after compression is T, and the compression rate is preferably 3% to 9%. The thickness of the portion of the seal 30 corresponding to the second region 222 after compression is t, and the compression rate is preferably 25% to 35%.

[0035] When the housing assembly of the embodiment of the present application is used in a power battery, when the power battery is circulated for a long time and the internal gas production is large, resulting in a high internal air pressure, the sealing nail 20 can be rotated to drive the portion of the seal 30 with the first compression rate to move to cover the pressure relief through hole 12. At this time, the seal 30 allows the pressure relief gas in the power battery to flow from the pressure relief through hole 12 to the exhaust through hole 21. After the pressure relief is completed, the sealing nail 20 can be rotated to drive the portion of the seal 30 with the second compression rate to move to cover the pressure relief through hole 12, so as to stop the pressure of the power battery, that is, to re-achieve the sealing of the high compression rate. The present application can effectively eliminate the problem of increased internal pressure caused by the slow gas production of the power battery, can realize the switching of pressure relief and pressure stop of the power battery (to prevent the explosion-proof valve from being unable to open), can extend the life of the power battery and improve the safety of the power battery.

[0036] In some embodiments, the top wall of the sealing groove 22 is divided into a first area 221, a second area 222 and a third area 223 smoothly connected between the first area 221 and the second area 222. The first area 221 and the second area 222 are planes parallel to the bottom wall of the sealing nail groove 11, and the third area 223 is a smooth curved surface. Based on this technical means, it is conducive to reliably realizing the above-mentioned manual pressure relief and pressure stopping structure. Of course, it is not limited to this.

[0037] In some embodiments, the seal 30 is a sealing ring 30 .

[0038] Specifically, an anti-rotation limiting convex portion 23 is formed in the middle of the sealing groove 22, the sealing ring 30 is tightly sleeved on the anti-rotation limiting convex portion 23, and the exhaust through hole 21 is formed at the anti-rotation limiting convex portion 23. Through the cooperation between the anti-rotation limiting convex portion 23 and the sealing ring 30, relative rotation between the sealing ring 30 and the sealing nail 20 can be prevented during rotation, thereby ensuring reliability.

[0039] Specifically, the anti-rotation limiting protrusion 23 is square, but not limited to this.

[0040] In some embodiments, the outer circumference of the bottom of the sealing pin 20 is provided with an annular sliding protrusion 24 protruding downward, and the bottom of the sliding protrusion 24 is in smooth contact with the bottom wall of the sealing pin groove 11. Since the bottom of the sealing pin 20 is formed with an annular sliding protrusion 24 and the sliding protrusion 24 is in smooth contact with the bottom wall of the sealing pin groove 11, the sealing pin 20 is slidably and rotatably arranged on the bottom wall of the sealing pin groove 11 through the sliding protrusion 24, which is conducive to the reliable assembly of the sealing pin 20 and can also reduce the difficulty of rotating the sealing pin 20.

[0041] Specifically, the sliding protrusion 24 is in linear contact with the bottom wall of the sealing pin groove 11 , which is beneficial for the sealing pin 20 to rotate on the bottom wall of the sealing pin groove 11 .

[0042] In a specific example, the cross section of the surface of the sliding protrusion 24 in the radial direction is in the shape of an arc.

[0043] In some embodiments, a pointer mark 25 is provided on the upper surface of the sealing pin 20, and a first state mark 13 and a second state mark 14 are provided on the upper surface of the shell 10 near the sealing pin groove 11. The first state mark 13 and the second state mark 14 are located at different positions in the rotation direction of the sealing pin 20. When the sealing pin 20 is rotated until the pointer mark 25 is aligned with the first state mark 13, the portion of the seal 30 with the first compression rate moves to cover the pressure relief hole 12 and the seal 30 allows the pressure relief gas to flow from the pressure relief hole 12 to the exhaust hole 21. When the sealing pin 20 is rotated until the pointer mark 25 is aligned with the second state mark 14, the portion of the seal 30 with the second compression rate moves to cover the pressure relief hole 12. By setting the pointer mark 25 and the first state mark 13 and the second state mark 14, when the sealing nail 20 is rotated until the pointer mark 25 is aligned with the first state mark 13, it can be determined that the portion of the seal 30 with the first compression rate moves to cover the pressure relief hole 12, and the internal gas can flow from the pressure relief hole 12 to the exhaust hole 21 and be discharged outward through the exhaust hole 21. After the pressure relief is completed, when the sealing nail 20 is rotated until the pointer mark 25 is aligned with the second state mark 14, it can be determined that the portion of the seal 30 with the second compression rate moves to cover the pressure relief hole 12, so that the pressure inside the power battery can be stopped and a strong seal can be achieved.

[0044] Specifically, the pointer mark 25 can be in the form of a notched groove, but is not limited thereto. In order to facilitate identification, the pointer mark 25 can be colored.

[0045] Specifically, the first state mark 13 and the second state mark 14 can be set in the form of concave dots, but are not limited thereto. For easy identification, the first state mark 13 and the second state mark 14 can be colored, for example, the first state mark 13 is set in red, and the second state mark 14 is set in blue.

[0046] Specifically, the first state mark 13 and the second state mark 14 are substantially arranged opposite to each other, but the present invention is not limited thereto.

[0047] In some embodiments, the side wall of the sealing pin 20 forms a first inverted cone 26, and the inner wall of the fixing ring 40 forms a second inverted cone 41 that matches the first inverted cone 26. The first inverted cone 26 has a plurality of hemispherical grooves 261 distributed along its circumference, and hard spheres 60 are respectively fitted in the plurality of hemispherical grooves 261. The second inverted cone 41 is provided with an annular groove 411 with a semicircular cross-section that matches the hard sphere 60. When the fixing ring 40 is assembled in the sealing pin groove 11, the plurality of hard spheres 60 and the annular groove 411 are fitted and installed, and the plurality of hard spheres 60 crimp and limit the sealing pin 20, and the compression rate of the seal 30 is locked. By means of the second inverted cone surface 41 of the fixing ring 40, the first inverted cone surface 26 of the sealing pin 20 and the arrangement of a plurality of hard spheres 60, the sealing pin 20 can be limited in the up-down direction and in the radial direction (i.e., it cannot move in the up-down direction and in the radial direction), the sealing pin 20 can be rotated along the second inverted cone surface 41, and the compression rate of the seal 30 can be locked.

[0048] Specifically, the hard sphere 60 can be a ceramic ball, a metal ball, etc., and the present application does not impose any specific limitation on this.

[0049] Specifically, a circle of bosses 111 protrude upward from the outer edge of the bottom wall of the sealing nail groove 11 , and the lower surface of the fixing ring 40 is attached to the bosses 111 , that is, after the fixing ring 40 is assembled, the fixing ring 40 is supported on the bosses 111 .

[0050] Specifically, the upper surface of the fixing ring 40 is a horizontal plane flush with or slightly lower than the upper surface of the shell 10, that is, after the fixing ring 40 is assembled, the upper surface of the fixing ring 40 is flush with or slightly lower than the upper surface of the shell 10, but of course it is not limited to this.

[0051] Specifically, the side wall of the sealing pin groove 11 and the outer side wall of the fixing ring 40 are matched conical surfaces, but this is certainly not limited to this.

[0052] Specifically, the outer wall of the fixing ring 40 and the outer wall of the sealing pin groove 11 are fixed by laser welding.

[0053] In some embodiments, the sealing pin 20 may be made of aluminum or steel, but is not limited thereto.

[0054] In some embodiments, the sealing pin 20 may be formed by integral stamping / stretching, but is not limited thereto.

[0055] In some embodiments, the material of the fixing ring 40 can be aluminum or steel, but is not limited thereto.

[0056] In some embodiments, the fixing ring 40 may be formed by integral stamping / stretching, but is not limited thereto.

[0057] In the example shown in the drawings, the housing 10 is the outer shell of the power battery, which is used to be sleeved on the outside of the winding core 70, and includes a housing side wall 101 and a housing bottom 102, wherein the upper surface of the housing 10 refers to the upper surface (outer surface) of the housing bottom 102. Of course, the housing 10 is not limited to being an outer shell, but can also be a cover of a power battery, in which case the upper surface of the housing 10 is the upper surface (outer surface) of the cover.

[0058] In order to facilitate the understanding of the present application, the assembly process of the housing assembly is described below in conjunction with the examples shown in the accompanying drawings, which should not be regarded as limiting the present application.

[0059] First, the sealing ring 30 is installed and fixed in the sealing groove 22 at the bottom of the sealing pin 20 .

[0060] Next, the sealing pin 20 is placed into the sealing pin groove 11 , the sealing ring 30 is crimped onto the bottom wall of the sealing pin groove 11 , and the hard sphere 60 is placed into the hemispherical groove 261 circumferentially distributed on the sealing pin 20 .

[0061] Next, assemble the fixing ring 40, and the annular groove 411 on the second inverted cone 41 is adapted to the exposed part of the hard sphere 60. The fixing ring 40 presses down the sealing pin 20 through the hard sphere 60 and adaptively adjusts the position of the sealing pin 20. When the lower surface of the fixing ring 40 is attached to the boss 111, the sealing pin 20 is limited in the up and down directions and radial directions, so that the sealing ring 30 is compressed downward into place, and the sliding protrusion 24 forms a linear contact with the bottom wall of the sealing pin groove 11.

[0062] Next, the outer side wall of the fixing ring 40 and the side wall of the sealing pin groove 11 are welded and fixed by laser welding.

[0063] Please combine Figures 1 to 12 , an embodiment of the present application also discloses a power battery, including a shell assembly for a power battery as described above.

[0064] When the power battery of the embodiment of the present application is circulated for a long time and the internal gas production is large, resulting in a high internal air pressure, the sealing nail 20 can be rotated to drive the portion of the seal 30 with the first compression rate to move to cover the pressure relief through hole 12. At this time, the seal 30 allows the gas in the power battery to flow from the pressure relief through hole 12 to the exhaust through hole 21. After the pressure relief is completed, the sealing nail 20 can be rotated to drive the portion of the seal 30 with the second compression rate to move to cover the pressure relief through hole 12, so as to stop the pressure of the power battery, that is, to re-achieve the sealing with a high compression rate. The present application can effectively eliminate the problem of increased internal pressure caused by slow gas production of the power battery, realize the switching of pressure relief and pressure stopping of the power battery, and prolong the life of the power battery and improve the safety of the power battery.

[0065] 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 housing assembly for a power battery, characterized in that: The housing assembly comprises a housing, a rotatable sealing pin, a sealing member and a fixing ring, the upper surface of the housing is provided with a sealing pin groove, the bottom wall of the sealing pin groove is eccentrically provided with a pressure relief through hole; the sealing pin is rotatably arranged in the sealing pin groove, the sealing pin is provided with an exhaust through hole penetrating up and down, the bottom wall of the sealing pin is concavely provided with a sealing member groove upward, the top wall of the sealing member groove comprises a first area and a second area, the first area is higher than the second area; the sealing member is assembled in the sealing member groove and is pressed between the top wall of the sealing member groove and the bottom wall of the sealing member groove, the sealing member corresponds to the first area The portion of the domain has a first compression rate, and the portion of the seal corresponding to the second region has a second compression rate, and the first compression rate is less than the second compression rate; the outer side of the fixing ring is fixedly connected to the side wall of the sealing pin groove, and the inner side of the fixing ring limits the sealing pin in the up and down directions and radial directions and allows the sealing pin to rotate along it, and the rotation of the sealing pin can make the portion of the seal with the first compression rate move to cover the pressure relief through hole and the seal allows the pressure relief gas to flow from the pressure relief through hole to the exhaust through hole and makes the portion of the seal with the second compression rate move to cover the pressure relief through hole.

2. The housing assembly for a power battery according to claim 1, characterized in that: The top wall of the sealing groove is divided into the first area, the second area and a third area smoothly connected between the first area and the second area, the first area and the second area are planes parallel to the bottom wall of the sealing nail groove, and the third area is a smooth curved surface.

3. The housing assembly for a power battery according to claim 1, characterized in that: The sealing member is a sealing ring, an anti-rotation limiting convex portion is formed in the middle of the sealing member groove, the sealing ring is tightly sleeved on the anti-rotation limiting convex portion, and the exhaust through hole is formed at the anti-rotation limiting convex portion.

4. The housing assembly for a power battery according to claim 1, characterized in that: An annular sliding protrusion is protruded downwardly from the outer periphery of the bottom of the sealing pin, and the bottom of the sliding protrusion is in smooth contact with the bottom wall of the sealing pin groove.

5. The housing assembly for a power battery according to claim 4, characterized in that: The sliding protrusion is in line contact with the bottom wall of the sealing pin groove.

6. The housing assembly for a power battery according to claim 1, characterized in that: A pointer mark is provided on the upper surface of the sealing pin, and a first state mark and a second state mark are provided on the upper surface of the shell at a position close to the sealing pin groove. The first state mark and the second state mark are located at different positions in the rotation direction of the sealing pin. When the sealing pin is rotated until the pointer mark is aligned with the first state mark, the part of the seal having the first compression rate moves to cover the pressure relief through hole and the seal allows the pressure relief gas to flow from the pressure relief through hole to the exhaust through hole. When the sealing pin is rotated until the pointer mark is aligned with the second state mark, the part of the seal having the second compression rate moves to cover the pressure relief through hole.

7. The housing assembly for a power battery according to claim 1, characterized in that: The side wall of the sealing pin forms a first inverted cone surface, and the inner side wall of the fixing ring forms a second inverted cone surface adapted to the first inverted cone surface, the first inverted cone surface has a plurality of first hemispherical grooves distributed along its circumference, the first inverted cone surface has a plurality of hemispherical grooves distributed along its circumference, and hard spheres are respectively adapted to be installed in the plurality of hemispherical grooves, the second inverted cone surface is provided with an annular groove with a semicircular cross-section adapted to the hard sphere, when the fixing ring is assembled in the sealing pin groove, the plurality of hard spheres and the annular groove are adapted to be installed, the plurality of hard spheres crimp and limit the sealing pin, and the compression rate of the seal is locked.

8. The housing assembly for a power battery according to claim 7, characterized in that: A circle of bosses is protruded upwards from the outer edge of the bottom wall of the sealing nail groove, and the lower surface of the fixing ring is attached to the bosses.

9. The housing assembly for a power battery according to claim 7 or 8, characterized in that: The side wall of the sealing pin groove and the outer side wall of the fixing ring are matched conical surfaces.

10. A power battery, characterized in that: Comprising a housing assembly for a power battery as described in any one of claims 1 to 9.

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