An explosion-proof valve capable of preventing water vapor from entering and a battery pack having the same

Abstract

An explosion-proof valve capable of preventing water vapor from entering, comprising a main body base, a main body cover, a waterproof and breathable film, a sealing gasket, and a water absorption material, the main body base is used for being installed on a battery pack main body, the main body cover is arranged on the main body base, the main body base is provided with an exhaust port and an air inlet, the waterproof and breathable film is arranged on the air inlet, the sealing gasket is arranged on the exhaust port, the water absorption material is arranged on the main body cover, at least one of the main body cover and the main body base is provided with a vent hole, external gas can enter the inside of the battery pack main body through the vent hole and the air inlet, the water absorption material is located in the air inlet channel and absorbs water vapor in the external gas, and the gas in the inside of the battery pack main body can push away the sealing gasket when the pressure reaches a set exhaust threshold value and is discharged outward through the vent hole. The water absorption material can absorb water vapor in the external gas, prevent water vapor from entering the explosion-proof valve, and can be replaced and recycled after being filled with water, thereby reducing the cost.

Description

Technical Field

[0001] This invention relates to the field of power batteries, and in particular to an explosion-proof valve that prevents moisture from entering and a battery pack having the same. Background Technology

[0002] Explosion-proof valves are a crucial component of new energy power battery packs. They are used to balance the pressure difference between the inside and outside of the battery pack, ensuring that under normal operating conditions, changes in the external environment (such as temperature and altitude variations) will not cause the seal to fail due to the pressure difference exceeding its tolerance. Furthermore, when thermal runaway occurs in the battery pack and the internal pressure rises rapidly, the explosion-proof valve's vent port is opened to quickly and directionally release internal gas, preventing the battery pack from exploding.

[0003] Current explosion-proof valves cannot completely prevent moisture from entering during gas exchange. When the external gas pressure exceeds the valve's set pressure, gas will flow into the valve body, and moisture will enter the battery pack. However, moisture entering the battery pack can cause short circuits, leading to thermal runaway, fire, and other significant safety hazards. Summary of the Invention

[0004] In view of this, the object of the present invention is to provide an explosion-proof valve that can prevent moisture from entering and a battery pack having therein.

[0005] This invention provides an explosion-proof valve that prevents moisture from entering, comprising a main base, a main cover, a waterproof and breathable membrane, a sealing gasket, and a water-absorbing material. The main base is used to install onto a battery pack body, the main cover is disposed on the main base, and the main base has an exhaust port and an air inlet. The waterproof and breathable membrane is disposed on the air inlet, the sealing gasket is disposed on the exhaust port, and the water-absorbing material is disposed on the main cover. At least one of the main cover and the main base has a vent hole, allowing external gas to enter the interior of the battery pack body through the vent hole and the air inlet. The water-absorbing material is located in the air inlet channel and absorbs moisture from the external gas. When the pressure inside the battery pack body reaches a set exhaust threshold, the gas pushes open the sealing gasket and is discharged outward through the vent hole.

[0006] Furthermore, it also includes a snap cover, which is detachably connected to the main body cover, and the absorbent material is fixed to the snap cover.

[0007] Furthermore, the cover is fixed to the main body cover by screws.

[0008] Furthermore, the surface of the cover facing the absorbent material is provided with an annular flange, and the absorbent material is fixed inside the flange.

[0009] Furthermore, the main body base has a first cavity in the middle, a second cavity on the outside of the first cavity, an air inlet and an exhaust outlet located in the first cavity and the second cavity respectively, a third cavity in the middle of the main body cover, a fourth cavity on the outside of the third cavity, the third cavity and the fourth cavity communicating with the first cavity and the second cavity respectively, the absorbent material located in the third cavity, and the vent hole located on the side wall of the second cavity and / or the fourth cavity, communicating with the first cavity and the third cavity through a perforation on the side wall of the first cavity and / or the third cavity.

[0010] Furthermore, the main body base is provided with a first ring wall and a second ring wall, the air inlet is located inside the first ring wall, the exhaust port is located between the first ring wall and the second ring wall, the main body cover is provided with a third ring wall and a fourth ring wall respectively opposite to the first ring wall and the second ring wall, the perforation is provided in at least one of the first ring wall and the third ring wall, and the vent is provided in at least one of the second ring wall and the fourth ring wall.

[0011] Furthermore, the first ring wall includes an inner ring portion, an outer ring portion, and a connecting portion. The outer ring portion is located between the inner ring portion and the main body cover, and the diameter of the outer ring portion is larger than the diameter of the inner ring portion. The connecting portion connects the inner ring portion and the outer ring portion. The perforation is provided in the outer ring portion, and the vent is provided in the fourth ring wall. The position of the perforation is higher than the position of the vent. The external gas enters the battery pack body through the tortuous flow channel formed by the vent, the fourth cavity, the perforation, the third cavity, the first cavity, and the air inlet.

[0012] Furthermore, the bottom of the absorbent material is lower than the bottom of the perforation, and the absorbent material is provided with an air channel extending radially inward. After the external gas enters the third cavity through the perforation, it flows along the air channel to the middle of the absorbent material.

[0013] Furthermore, the portion of the sealing gasket near one of the first and second ring walls can be pushed open by the gas inside the battery pack body during exhaust. The air inside the battery pack body enters the second cavity through the part of the sealing gasket that is pushed open, and after being reversed by the inner ring and the connecting portion, it is discharged from the battery pack body through the vent.

[0014] Furthermore, the main body base also includes a spring plate, which is pressed on top of the sealing gasket. The portion of the spring plate near one of the first ring wall and the second ring wall is fixed to the main body base, and the portion of the spring plate near the other of the first ring wall and the second ring wall is pressed flat on the sealing gasket.

[0015] The present invention also provides a battery pack, including a battery pack body, wherein the battery pack body is provided with the aforementioned explosion-proof valve that prevents moisture from entering.

[0016] The explosion-proof valve of this invention is equipped with a water-absorbing material. When the external pressure exceeds a set air inlet threshold, external gas flows into the valve body through the vent hole in the main body base, comes into contact with the water-absorbing material, and removes moisture from the external gas, preventing moisture from entering the battery pack body. In some embodiments, the water-absorbing material can be replaced and recycled after reaching its moisture absorption capacity, reducing costs. Attached Figure Description

[0017] Figure 1 This is an exploded view of an explosion-proof valve that prevents moisture from entering, provided in an embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram of the assembly of an explosion-proof valve that prevents water vapor from entering, provided in an embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram of the assembly of the main base, sealing gasket, and spring plate in an embodiment of the present invention.

[0020] Figure 4 This is an exploded view of the main base, sealing gasket, and spring plate in an embodiment of the present invention.

[0021] Figure 5 and Figure 6 This is a schematic diagram of the main body cover in an embodiment of the present invention.

[0022] Figure 7 This is a schematic diagram of the cover in an embodiment of the present invention.

[0023] Figure 8 This is a schematic diagram of the water-absorbing material in an embodiment of the present invention.

[0024] Figure 9 This is a cross-sectional schematic diagram of an explosion-proof valve that prevents water vapor from entering, provided in an embodiment of the present invention, and the air intake direction is shown in the diagram.

[0025] Figure 10 This is a cross-sectional schematic diagram of an explosion-proof valve that prevents water vapor from entering, provided in an embodiment of the present invention, and the direction of air outlet is shown in the diagram.

[0026] The reference numerals and components involved in the accompanying drawings are shown below:

[0027] 10. Main body base; 11. Air inlet; 12. Exhaust outlet; 13. Base plate; 14. First ring wall; 141. Inner ring; 142. Outer ring; 143. Connecting part; 15. Second ring wall; 16. First cavity; 17. Second cavity; 18. First support part; 19. Second support part; 191. Groove;

[0028] 20. Main body cover; 201. Vent hole; 21. Top plate; 22. Third ring wall; 23. Fourth ring wall; 24. Third cavity; 25. Fourth cavity; 27. Top plate opening; 28. Cover receiving groove; 29. ​​Third support part;

[0029] 30. Waterproof and breathable membrane;

[0030] 40. Spring clip pressure plate; 41. Fixing part;

[0031] 50. Sealing gasket;

[0032] 60. Cover; 61. Flange;

[0033] 70. Absorbent material; 71. Airway;

[0034] 80. Sealing ring. Detailed Implementation

[0035] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. Based on the description of the present invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present invention.

[0036] In the description of this invention, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0037] The terms “upper,” “lower,” “left,” “right,” “front,” “back,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use. They are only for the convenience of description and simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0038] The terms “first,” “second,” “third,” etc., are used merely to distinguish elements with similar properties, not to indicate or imply relative importance or a specific order.

[0039] The terms “include,” “comprising,” or any other variation thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0040] like Figure 1-2 and Figure 9-10 As shown, the present invention provides an explosion-proof valve that can prevent moisture from entering, which includes a main body base 10, a main body cover 20, a waterproof and breathable membrane 30, a spring plate 40, a sealing gasket 50, a snap cover 60, and a water-absorbing material 70.

[0041] The main body base 10 is used to install onto the battery pack body, and a sealing ring 80 can be set between it and the battery pack body to ensure good sealing. The main body cover 20 is set on the main body base 10, and the main body base 10 is provided with an air inlet 11 and an exhaust outlet 12. A waterproof and breathable membrane 30 is set on the air inlet 11, a sealing gasket 50 and a spring plate 40 are set on the exhaust outlet 12, a water-absorbing material 70 is set on the main body cover 20, and a cover 60 is set on top of the water-absorbing material 70. At least one of the main body cover 20 and the main body base 10 is provided with at least one vent hole 21, and external gas can enter the interior of the battery pack body through the vent hole 21 and the air inlet 11. The water-absorbing material 70 is located in the air inlet channel and absorbs water vapor in the external gas. When the pressure inside the battery pack body reaches the set exhaust threshold, the gas can push open the sealing gasket 50 and be discharged outward through the vent hole 21.

[0042] Please see Figure 3-4 and Figure 9-10The main base 10 includes a base plate 13 and a first annular wall 14 and a second annular wall 15 disposed on the base plate 13. The first annular wall 14 extends upward from the middle of the base plate 13, forming a first cavity 16 between the first annular wall 14 and the base plate 13. The second annular wall 15 extends upward from the outer edge of the base plate 13, forming a second cavity 17 between the first annular wall 14, the second annular wall 15, and the base plate 13. An air inlet 11 is located on the base plate 13, and the air inlet 11 is located inside the first annular wall 14. An exhaust port 12 is located between the first annular wall 14 and the second annular wall 15, separated from the air inlet 11. The diameter of the air inlet 11 is smaller than the inner wall diameter of the first annular wall 14. A first support portion 18 is formed at the bottom of the first annular wall 14 to support the waterproof and breathable membrane 30, facilitating the fixing of the waterproof and breathable membrane 30 to the air inlet 11. The radial width of the exhaust port 12 along the main base 10 is less than the distance between the first ring wall 14 and the second ring wall 15. A second support portion 19 is formed between the first ring wall 14 and the second ring wall 15 to support the sealing gasket 50 and the spring plate 40, facilitating the sealing gasket 50 and the spring plate 40 to cover the exhaust port 12. Furthermore, the spring plate 40 has a fixing portion 41 on one side near either the first ring wall 14 or the second ring wall 15. The second support portion 19 has a groove 191 that mates with the fixing portion 41. The inner or outer end of the spring plate 40 is detachably fixed to the second support portion 19 through the engagement of the fixing portion 41 and the groove 191. The spring plate 40 presses flat against the sealing gasket 50 on the other side near either the first ring wall 14 or the second ring wall 15, providing a certain pressure to the sealing gasket 50 and ensuring that the exhaust port 12 is closed under normal conditions. However, when the gas pressure inside the battery pack reaches the set exhaust threshold, the non-fixed ends of the spring plate 40 and the sealing gasket 50 will be pushed open by the gas pressure inside the battery pack, allowing the gas inside the battery pack to be discharged through the exhaust port 12.

[0043] It should be noted that in this embodiment, the fixing part 41 is a spring sheet formed by bending and extending downward from the flat body of the spring sheet pressure plate 40. The spring sheet pressure plate 40 is fixed to the second support part 19 through the interference fit between the spring sheet and the groove 191. It is understood that the shape of the fixing part 41 is not limited to this. For example, the fixing part 41 can also be a spring sheet with barbs, and the shape of the groove 191 can match it. The spring sheet pressure plate 40 is fixed to the second support part 19 through the hook between the fixing part 41 and the groove 191. It is also understood that the form of cooperation between the spring sheet pressure plate 40 and the second support part 19 is not limited to detachable fixing. It can also be non-detachable fixing. For example, the spring sheet pressure plate 40 can be directly welded or bonded to the second support part 19. In the embodiment where the spring sheet pressure plate 40 is directly welded or bonded to the second support part 19, the spring sheet pressure plate 40 may not have a fixing part 41.

[0044] More specifically, the first annular wall 14 includes an inner ring portion 141, an outer ring portion 142, and a connecting portion 143. The outer ring portion 142 is axially located between the inner ring portion 141 and the main body cover 20, and its diameter is larger than that of the inner ring portion 141, such that it is radially located between the inner ring portion 141 and the second annular wall 15. The connecting portion 143 transversely connects the outer ring portion 142 and the inner ring portion 141. The height of the connecting portion 143 and the outer ring portion 142 is greater than the height of the second annular wall 15; that is, the distance between the bottom end of the connecting portion 143 and the top end of the outer ring portion 142 and the base plate 13 is greater than the distance between the top end of the second annular wall 15 and the base plate 13. The effect of this arrangement is described in the following paragraph.

[0045] like Figure 5-6 and Figure 9-10 As shown, the main body cover 20 includes a top plate 21, and a third ring wall 22 and a fourth ring wall 23 corresponding to the first ring wall 14 and the second ring wall 15, respectively. The third ring wall 22 and the fourth ring wall 23 extend downward from the middle and outer edges of the top plate 21, respectively. A third cavity 24 is formed on the inner side of the third ring wall 22, and a fourth cavity 25 is formed between the third ring wall 22, the fourth ring wall 23, and the top plate 21. The third cavity 24 is located above the first cavity 16 and communicates with the first cavity 16. The fourth cavity 25 is located above the second cavity 17 and communicates with the second cavity 17. The bottom of the fourth ring wall 23 is provided with a plurality of the aforementioned ventilation holes 201, and the top of the outer ring portion 142 of the first ring wall 14 is provided with a perforation (not shown) communicating with the ventilation holes 201. Understandably, the vent 201 can also be located on the second ring wall 15, or simultaneously on the second ring wall 15 and the fourth ring wall 23, and the perforation can also be located on the third ring wall 22, or simultaneously on the first ring wall 14 and the third ring wall 22. Since the height of the outer ring 142 is greater than the height of the second ring wall 15, the height of the perforation is greater than the height of the vent 201. Therefore, during the process of external gas entering the battery pack body, the gas entering through the vent 201 is redirected by the outer ring 142 before entering the perforation, thus increasing the gas's path length and flow rate. Furthermore, during the process of gas inside the battery pack body being discharged outwards through the sealing gasket 50, the gas discharged from the exhaust port 12 is redirected by the inner ring 141 and the connecting portion 143, and can then be more easily discharged outwards through the vent 201.

[0046] Furthermore, the main body cover 20 has a circular top plate opening 27 on the inner side of the first ring wall 14, and a circular cover receiving groove 28 on the upper outer surface of the top plate 21. The diameter of the cover receiving groove 28 is larger than the diameter of the top plate opening 27, forming a third support portion 29 on the top plate 21 of the main body cover 20. The cover 60 is disposed in the cover receiving groove 28 and is detachably connected to the main body cover 20. In this embodiment, the cover 60 and the top plate 21 are each provided with threaded holes, and the cover 60 is detachably fixed to the main body cover 20 by screws screwed into the threaded holes. It is understood that the cover 60 and the top plate 21 can also be detachably connected in other ways, such as by threaded connection or snap-fit ​​connection. Threaded connection refers to the cover 60 and the top plate 21 being connected together by internal and external threads provided on their contact surfaces. The specific methods of snap-fit ​​connection are common in the prior art and will not be described in detail here. It is also understandable that the cover 60 and the top plate 21 can be connected in a non-removable manner, such as by bonding, or the cover 60 and the top plate 21 can be directly processed into one piece.

[0047] Please see Figure 7 , Figure 9 and Figure 10 A ring-shaped flange 61 is located at the center of the lower surface of the cover 60. The absorbent material 70 is inserted into the flange 61 via an interference fit, and is detachably connected to the cover 60. It is understood that the absorbent material 70 and the cover 60 can also be detachably connected in other ways, such as by threaded connection or snap-fit ​​connection. It is also understood that the absorbent material 70 and the cover 60 can also be non-detachably connected, such as by adhesive bonding.

[0048] Please see Figure 8 , Figure 9 and Figure 10 The absorbent material 70 is provided with several radially extending air channels 71. The air channels 71 extend inward from the edge of the absorbent material 70 to a position near the middle of the absorbent material 70. The gas entering the third cavity 24 through the perforation is guided by the air channels 71 to reach a deeper position inside the absorbent material 70, making better contact with the absorbent material 70 and allowing the water vapor contained in the gas to be better absorbed. In addition, the bottom end of the absorbent material 70 is lower than the perforation in the height direction of the explosion-proof valve, and the perforation is higher than the vent 201 in the height direction of the explosion-proof valve. In this way, the vent 201, the fourth cavity 25, the perforation, the third cavity 24, the first cavity 16, and the air inlet 11 form a meandering air intake channel. This meandering air intake channel can increase the length of the external gas movement path and reduce the gas flow speed, so that the external gas can fully contact the absorbent material 70, remove the water vapor in it, and then enter the battery pack body through the waterproof and breathable membrane 30.

[0049] The present invention also provides a battery pack, including a battery pack body, wherein the battery pack body is provided with the aforementioned explosion-proof valve that prevents moisture from entering.

[0050] As described above, this invention, by incorporating a water-absorbing material 70 within the explosion-proof valve, ensures that the external pressure exceeds a set air intake threshold. As external gas flows through the vent 201 of the main body base 10 into the valve body's internal space, it comes into contact with the water-absorbing material 70, removing any moisture and preventing it from entering the explosion-proof valve. Furthermore, because the explosion-proof valve of this invention forms a meandering air intake channel, the gas travels a longer distance and flows at a slower speed, allowing for sufficient contact with the water-absorbing material 70 within the air intake channel. This ensures good water absorption before the gas passes through the waterproof and breathable membrane 30 and enters the battery pack body. In some embodiments of this invention, the water-absorbing material 70 can be replaced and reused once it reaches its moisture absorption capacity, reducing costs. When thermal runaway occurs in the battery pack body and the internal pressure rapidly increases, the internal gas can push the sealing gasket 50 and the spring plate 40 upwards, releasing it quickly outwards through the vent 201, preventing excessive pressure inside the battery pack body from causing an explosion.

[0051] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An explosion-proof valve that prevents moisture from entering, characterized in that: The battery pack includes a main base (10), a main cover (20), a waterproof and breathable membrane (30), a sealing gasket (50), and absorbent material (70). The main base (10) is used to install onto the battery pack body. The main cover (20) is located on the main base (10). The bottom of the main base (10) is provided with an exhaust port (12) and an air inlet (11). The waterproof and breathable membrane (30) is located on the air inlet (11), and the sealing gasket (50) is located on the exhaust port (12). The absorbent material (70) is located on the main base (10). 0) A vent (201) is provided on the main body cover (20), at least one of the bottom of the main body cover (20) and the top of the main body base (10) is provided, and external gas can enter the interior of the battery pack body through the vent (201) and the air inlet (11). The water-absorbing material (70) is located in the air inlet channel and absorbs water vapor in the external gas. When the pressure reaches the set exhaust threshold, the gas inside the battery pack body can push open the sealing gasket (50) and be discharged outward through the vent (201).

2. The explosion-proof valve for preventing moisture ingress as described in claim 1, characterized in that: It also includes a cover (60), which is detachably connected to the main body cover (20), and the absorbent material (70) is fixed on the cover (60).

3. The explosion-proof valve for preventing moisture ingress as described in claim 2, characterized in that: The cover (60) is fixed to the upper cover (20) of the main body by screws.

4. The explosion-proof valve for preventing moisture ingress as described in claim 2, characterized in that: The cover (60) has an annular flange (61) on the surface facing the absorbent material (70), and the absorbent material (70) is fixed inside the flange (61).

5. The explosion-proof valve for preventing moisture ingress as described in claim 1, characterized in that: The main body base (10) has a first cavity (16) in the middle and a second cavity (17) on the outside of the first cavity (16). The air inlet (11) and the exhaust outlet (12) are located in the first cavity (16) and the second cavity (17) respectively. The main body cover (20) has a third cavity (24) in the middle and a fourth cavity (25) on the outside of the third cavity (24). The third cavity (24) and the fourth cavity (25) are connected to the first cavity (16) and the second cavity (17) respectively. The absorbent material (70) is located in the third cavity (24). The vent (201) is located on the side wall of the second cavity (17) and / or the fourth cavity (25) and is connected to the first cavity (16) and the third cavity (24) through the perforation on the side wall of the first cavity (16) and / or the third cavity (24).

6. The explosion-proof valve for preventing moisture ingress as described in claim 5, characterized in that: The main body base (10) is provided with a first ring wall (14) and a second ring wall (15). The air inlet (11) is located inside the first ring wall (14). The exhaust port (12) is located between the first ring wall (14) and the second ring wall (15). The main body cover (20) is provided with a third ring wall (22) and a fourth ring wall (23) respectively opposite to the first ring wall (14) and the second ring wall (15). The perforation is provided in at least one of the first ring wall (14) and the third ring wall (22). The vent (201) is provided in at least one of the second ring wall (15) and the fourth ring wall (23).

7. The explosion-proof valve for preventing moisture ingress as described in claim 6, characterized in that: The first ring wall (14) includes an inner ring (141), an outer ring (142) and a connecting part (143). The outer ring (142) is located between the inner ring (141) and the main body cover (20), and the diameter of the outer ring (142) is larger than the diameter of the inner ring (141). The connecting part (143) connects the inner ring (141) and the outer ring (142). The perforation is provided in the outer ring (142). The vent (201) is provided in the fourth ring wall (23), and the position of the perforation is higher than the position of the vent (201). The external gas enters the battery pack body through the tortuous flow channel formed by the vent (201), the fourth cavity (25), the perforation, the third cavity (24), the first cavity (16) and the air inlet (11).

8. The explosion-proof valve for preventing moisture ingress as described in claim 7, characterized in that: The bottom of the absorbent material (70) is lower than the bottom of the perforation. The absorbent material (70) is provided with an air passage (71) extending radially inward. The external gas enters the third cavity (24) through the perforation and flows along the air passage (71) to the middle of the absorbent material (70).

9. The explosion-proof valve for preventing moisture ingress as described in claim 7, characterized in that: The portion of the sealing gasket (50) near one of the first ring wall (14) and the second ring wall (15) can be pushed open by the gas inside the battery pack body during exhaust. The air inside the battery pack body enters the second cavity (17) through the part of the sealing gasket (50) that is pushed open, and after being reversed by the inner ring (141) and the connecting part (143), it is discharged from the battery pack body through the vent (201).

10. The explosion-proof valve for preventing moisture ingress as described in claim 6, characterized in that: The main body base (10) also includes a spring plate (40), which is pressed on the sealing gasket (50). The portion of the spring plate (40) near one of the first ring wall (14) and the second ring wall (15) is fixed to the main body base (10), and the other portion of the spring plate (40) near the other of the first ring wall (14) and the second ring wall (15) is pressed flat on the sealing gasket (50).

11. A battery pack, comprising a battery pack body, characterized in that: The battery pack body is provided with an explosion-proof valve as described in any one of claims 1-10, which can prevent moisture from entering.

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