Battery pack explosion-proof valve, battery pack and electric device

Abstract

The present disclosure relates to a battery pack explosion-proof valve, a battery pack and an electric device. The battery pack explosion-proof valve comprises a valve body, the valve body is formed with a cavity and is provided with a first locking piece; a separation film, the separation film is connected to the valve body and is used for closing the cavity; a needle assembly, the needle assembly is slidingly arranged in the cavity along a first direction, the needle assembly comprises a needle and a connecting seat connected with each other, the connecting seat is provided with a second locking piece, and the second locking piece is used for locking cooperation with the first locking piece, so that the needle is kept at a position of piercing the separation film. The battery pack explosion-proof valve provided by the present disclosure can discharge all the gas in the battery pack and is beneficial to rapid pressure relief of the battery pack.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of battery explosion-proof valve, in particular to a battery pack explosion-proof valve, a battery pack and an electric device. BACKGROUND

[0002] In the related art, when the battery explosion-proof valve is opened, the exhaust gap will decrease with the decrease of the gas pressure in the battery pack, and even be closed in advance, so that the gas in the battery pack cannot be completely discharged. SUMMARY

[0003] The purpose of the present disclosure is to provide a battery pack explosion-proof valve which can completely discharge the gas in the battery pack and is beneficial to rapid pressure relief of the battery pack.

[0004] In order to achieve the above-mentioned purpose, according to a first aspect of an embodiment of the present disclosure, a battery pack explosion-proof valve is provided, comprising: a valve body, the valve body is formed with a cavity and is provided with a first locking piece; an isolation membrane, the isolation membrane is connected to the valve body and is used for closing the cavity; a needle assembly, the needle assembly is arranged in the cavity in a sliding manner along a first direction, the needle assembly comprises a needle and a connecting seat connected with each other, the connecting seat is provided with a second locking piece, the second locking piece is used for locking cooperation with the first locking piece, so that the needle is kept at a position of piercing the isolation membrane.

[0005] Optionally, the battery pack explosion-proof valve further comprises an actuating piece, one of the valve body and the connecting seat is provided with a locking groove, the other is provided with a mounting groove, one of the first locking piece and the second locking piece is used as the locking groove, the other of the first locking piece and the second locking piece is connected to the mounting groove through the actuating piece, the actuating piece is used for causing the one of the first locking piece and the second locking piece connected to the mounting groove to protrude out of the mounting groove to lock with the locking groove.

[0006] Optionally, the valve body is provided with the locking groove, the connecting seat is provided with the mounting groove, the locking groove is recessed from the cavity wall of the cavity in a second direction away from the connecting seat, the mounting groove is recessed from the surface of the connecting seat in the second direction away from the valve body, and the actuating piece is configured as a first spring, one end of the first spring is connected to the groove wall of the mounting groove, and the other end of the first spring is connected to the second locking piece.

[0007] Optionally, the cavity has a first opening and a second opening arranged oppositely in the first direction, and the isolation membrane is arranged at the first opening and is used for closing the first opening.

[0008] Optionally, the needle assembly has a first position in which the second locking member is retracted into the mounting slot, the connecting seat is in sealing contact with the cavity wall of the valve body to seal the second opening, and a gap is formed between the connecting seat and the cavity wall of the valve body.

[0009] Optionally, the needle assembly has a second position in which the actuating member causes the second locking member to extend out of the mounting slot to lockingly engage with the first locking member, the connecting seat is spaced apart from the cavity wall of the valve body, and the needle pierces the isolation membrane.

[0010] Optionally, the cavity includes a small-diameter portion and a large-diameter portion connected in series, the second opening is formed in the small-diameter portion, the small-diameter portion is configured as a constant-diameter hole, and the hole diameter of the large-diameter portion gradually increases from the small-diameter portion toward the first opening, in the first position, the connecting seat is in sealing contact with the cavity wall of the small-diameter portion, and in the second position, the gap is formed between the connecting seat and the large-diameter portion.

[0011] Optionally, the needle includes a body and a piercing portion, the body is connected to the connecting seat, the piercing portion is connected to one end of the body away from the connecting seat, and a stepped surface is formed between the piercing portion and the body, the valve body includes a mounting seat arranged in the cavity and formed with a mounting through hole and a stop flange, the stop flange is arranged on one side of the mounting through hole facing the connecting seat and extends inwardly along the radial direction of the mounting through hole, the needle is arranged in the mounting through hole, and the stepped surface is used to abut against the stop flange.

[0012] Optionally, the battery pack explosion-proof valve further includes an elastic member, the elastic member is sleeved on the body, one end of the elastic member abuts against the connecting seat, and the other end of the elastic member abuts against the stop flange.

[0013] Optionally, the elastic member is configured as a second spring.

[0014] Optionally, the connecting seat is provided with a plug hole, the body is plugged into the plug hole and fixedly connected with the plug hole.

[0015] Optionally, the needle is provided with a gas gathering hole extending from the end surface of the body away from the piercing portion toward the piercing portion.

[0016] According to a second aspect of the embodiments of the present disclosure, a battery pack is provided, including a pack body, and further including the battery pack explosion-proof valve described above, the battery pack explosion-proof valve is mounted on the pack body and includes a cavity and an isolation membrane, the isolation membrane is arranged in the cavity to isolate the internal space of the pack body from the external environment.

[0017] According to a third aspect of the embodiments of the present disclosure, a battery pack is provided.

[0018] By the above technical solution, in the battery pack explosion valve provided by the present disclosure, the valve body, the isolation film and the needle assembly are arranged, the first locking member is arranged on the valve body, the needle assembly includes the needle and the connecting seat, the second locking member is arranged on the connecting seat, and the second locking member is used for locking cooperation with the first locking member. By such arrangement, when the valve is opened, the connecting seat can be locked on the valve body through the locking cooperation of the second locking member and the first locking member, and then the needle assembly is locked on the valve body, so that the needle is kept at the position of piercing the isolation film, that is, the battery pack explosion valve is kept in the open valve state, so as to ensure that the gas in the battery pack can be completely discharged. In addition, through the locking cooperation of the second locking member and the first locking member, the battery pack explosion valve can keep stable exhaust capacity, which is beneficial to rapid pressure relief.

[0019] Other features and advantages of the present disclosure will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, and are used together with the following specific embodiments to explain the present disclosure, but do not constitute a limitation on the present disclosure. In the drawings:

[0021] Figure 1 is a valve closing state schematic diagram of the battery pack explosion valve provided by the exemplary embodiments of the present disclosure;

[0022] Figure 2 is a valve opening state schematic diagram of the battery pack explosion valve provided by the exemplary embodiments of the present disclosure;

[0023] Figure 3 is a state schematic diagram of the connecting seat and the valve body abutting and sealing of the battery pack explosion valve provided by the exemplary embodiments of the present disclosure;

[0024] Figure 4 is an installation schematic diagram of the mounting seat and the needle of the battery pack explosion valve provided by the exemplary embodiments of the present disclosure.

[0025] BRIEF DESCRIPTION OF DRAWINGS

[0026] 1- battery pack explosion-proof valve; 11- valve body; 110- first opening; 111- cavity; 1110- small diameter portion; 112- mounting seat; 1120- large diameter portion; 12- ejector pin assembly; 120- second opening; 121- ejector pin; 1211- gas gathering hole; 122- connecting seat; 1221- mounting groove; 1222- plug-in hole; 123- main body; 124- spike portion; 125- stop flange; 126- step surface; 127- mounting through hole; 13- isolation membrane; 14- second locking member; 15- first locking member; 16- actuator; 17- elastic member. DETAILED DESCRIPTION

[0027] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0028] In the present disclosure, unless otherwise stated, directional words such as "first direction, second direction" refer to the attached Figure 1 In the following description, when referring to the drawings, unless otherwise indicated, the same reference numerals in different drawings represent the same or similar elements. The above definitions are used only to explain and illustrate the present disclosure and should not be construed as limiting the present disclosure.

[0029] According to the specific embodiment of the present disclosure, Figures 1 to 4 As shown in the figure, a battery pack explosion-proof valve is provided, which includes: a valve body 11, the valve body 11 is formed with a cavity 111 and is provided with a first locking piece 15; an isolation membrane 13, the isolation membrane 13 is connected to the valve body 11 and is used to close the cavity 111; the ejector assembly 12 is arranged in the cavity 111 for sliding along a first direction, the ejector assembly 12 includes a connected ejector 121 and a connecting seat 122, and the connecting seat 122 is provided with a second locking piece 14, the second locking piece 14 is used to lock and cooperate with the first locking piece 15, so that the ejector 121 remains in a position to puncture the isolation membrane 13.

[0030] According to the technical scheme, the battery pack explosion-proof valve provided by the present disclosure is provided with a valve body 11, a separation film 13 and a needle assembly 12, the valve body 11 is provided with a first locking piece 15, the needle assembly 12 comprises a needle 121 and a connecting seat 122, the connecting seat 122 is provided with a second locking piece 14, the second locking piece 14 is used for locking cooperation with the first locking piece 15, and through such arrangement, when the valve is opened, the connecting seat 122 can be locked on the valve body 11 through the locking cooperation of the second locking piece 14 and the first locking piece 15, and then the needle assembly 12 is locked on the valve body 11, so that the needle 121 is kept at the position of piercing the separation film 13, that is, the battery pack explosion-proof valve is kept in the open valve state, so as to ensure that the gas in the battery pack can be completely discharged, and in addition, the battery pack explosion-proof valve can keep a stable exhaust capacity through the locking cooperation of the second locking piece 14 and the first locking piece 15, which is beneficial to rapid pressure relief.

[0031] In the battery pack explosion-proof valve provided by the present disclosure, when the valve is not opened, that is, in the closed valve state, the separation film 13 has sufficient distance with the needle 121, so that the phenomenon of mistaken opening of the valve caused by too short distance between the needle 121 and the separation film 13 and collapse of the separation film 13 itself can be avoided, when the gas pressure in the battery pack gradually increases, the increased gas pressure will push the needle assembly 12 to move, so that the needle 121 pierces the separation film 13 to open the valve, after the separation film 13 is pierced, the gas in the battery pack can be quickly discharged from the cavity 111, so as to achieve the purpose of rapid pressure relief. In the present disclosure, the distance between the needle 121 and the separation film 13 can be set according to the use requirement, so as to ensure that the needle 121 and the separation film 13 have a large moving distance, and avoid the problem of mistaken opening of the valve caused by accidental piercing of the separation film 13.

[0032] In the exemplary embodiments provided by the present disclosure, as shown in FIG. 1, Figures 1 to 3 In the exemplary embodiments provided by the present disclosure, as shown in FIG. 1,

[0033] In the example embodiments provided in the present disclosure, reference is made to Figures 1 to 3 As shown in Figs. 1-3, the valve body 11 is provided with a locking groove, and the connecting seat 122 is provided with a mounting groove 1221, the locking groove is recessed from the cavity wall of the cavity 111 in the second direction away from the connecting seat 122, and the mounting groove 1221 is recessed from the surface of the connecting seat 122 in the second direction away from the valve body 11, and the actuating member 16 is configured as a first spring, one end of the first spring is connected to the groove wall of the mounting groove 1221, and the other end is connected to the second locking member 14. In the above technical solution, the first spring has elasticity, when the mounting groove 1221 is opposite to the locking groove, the second locking member 14 is extended from the mounting groove 1221 under the elastic force of the first spring and inserted into the locking groove to lock with the locking groove, thus, the automatic locking of the second locking member 14 and the first locking member 15 is realized.

[0034] In the example embodiments provided in the present disclosure, reference is made to Figure 1 and Figure 2 As shown in Figs. 1-3, the cavity 111 can have a first opening 110 and a second opening 120 arranged oppositely in the first direction, and the isolation film 13 is arranged at the first opening 110 and used to close the first opening 110. Here, the isolation film 13 is used to prevent dust, water stains, etc. from entering the cavity 111, and the second opening 120 is used to communicate with the internal space of the battery pack.

[0035] In the example embodiments provided in the present disclosure, reference is made to Figure 1 As shown in Figs. 1-3, the top pin assembly 12 has a first position, in which the second locking member 14 is retracted into the mounting groove 1221, the connecting seat 122 is in sealing contact with the cavity wall of the valve body 11 to seal the second opening 120, and the top pin 121 has a gap with the isolation film 13, and when in the first position, the valve is in a closed state (please refer to Figure 1 ), that is, the connecting seat 122 is in sealing contact with the cavity wall of the valve body 11 to seal the second opening 120, and the end of the connecting seat 122 close to the second opening 120 forms a closed space with the valve body 11, so that when the internal gas pressure of the battery pack reaches the explosion pressure of the battery pack explosion-proof valve, the gas pressure increases rapidly to quickly push the connecting seat 122 to move, and the movement of the connecting seat 122 drives the top pin 121 to pierce the isolation film 13, thereby facilitating the timely triggering of the valve opening action and improving the valve opening efficiency of the battery pack explosion-proof valve.

[0036] In the example embodiments provided in the present disclosure, reference is made to Figure 2 As shown in Figs. 1-3, the top pin assembly 12 has a second position, in which the actuating member 16 causes the second locking member 14 to extend from the mounting groove 1221 to lock with the first locking member 15, and the connecting seat 122 forms a gap with the cavity wall of the valve body 11, and the top pin 121 pierces the isolation film 13. When in the second position, that is, when the valve is open (please refer toFigure 2 ), since a gap is formed between the connecting seat 122 and the cavity wall of the valve body 11, the gas can reach the first opening 110 through the gap and be discharged through the first opening 110. Here, since in the second position, the actuator 16 causes the second locking member 14 to extend from the mounting groove 1221 to lock and cooperate with the first locking member 15, therefore, in the second position, the ejector assembly 12 is locked to the valve body 11 and a gap is always maintained between the connecting seat 122 and the cavity wall of the valve body 11, the gas can be continuously discharged, ensuring that the gas in the battery pack is completely discharged, and facilitating rapid pressure relief of the battery pack.

[0037] It should be noted that, when the valve is not opened, that is, when the valve is closed, the connection seat 122 is in sealed contact with the cavity wall of the valve body 11 to form a closed space, and the closed space is connected to the interior of the battery pack. Therefore, the isolation membrane 13 can be a waterproof and breathable membrane. The waterproof and breathable membrane has excellent waterproof and breathable properties, which can not only prevent liquid from entering the cavity, but also enable the gas in the cavity 111 to be discharged. In this way, when the valve is opened, some gas can be discharged directly to the outside through the waterproof and breathable membrane, thereby improving the exhaust efficiency. The isolation membrane 13 can be connected to the valve body 11 by any suitable installation method, such as welding, and the present disclosure does not impose specific restrictions on this.

[0038] In the exemplary embodiments provided in the present disclosure, reference is made to Figure 1 and Figure 2 As shown in the figure, the cavity 111 may include a connected small diameter portion 1110 and a large diameter portion 1120, the second opening 120 is formed in the small diameter portion 1110, the small diameter portion 1110 is constructed as an equal diameter hole, and the aperture of the large diameter portion 1120 gradually expands from the small diameter portion 1110 toward the first opening 110. In the first position, the connecting seat 122 is in sealing contact with the cavity wall of the small diameter portion 1110. In the second position, a gap is formed between the connecting seat 122 and the large diameter portion 1120. Through such arrangement, the connecting seat 122 is in sealed contact with the small-diameter portion 1110 to form an enclosed space. When the internal air pressure of the battery pack reaches the detonation pressure of the battery pack explosion-proof valve, the pressure of the gas pushes the connecting seat 122 to drive the ejector pin 121 to move toward the first opening 110. Since the aperture of the large-diameter portion 1120 gradually expands from the small-diameter portion 1110 toward the first opening 110, as the connecting seat 122 moves, the gap gradually increases, and the exhaust volume increases, which is conducive to rapid exhaust and pressure relief, and improves the pressure relief efficiency. In addition, as the connecting seat 122 moves, the friction between the connecting seat 122 and the cavity 111 decreases, which is conducive to the gas pushing the connecting seat 122 smoothly, thereby further improving the efficiency of exhaust and pressure relief.

[0039] In the present disclosure, the small-diameter portion 1110 is configured as a hole of equal diameter, which facilitates connecting the small-diameter portion 1110 to the battery pack.

[0040] In another exemplary embodiment provided by the present disclosure, the first locking member 15 and the second locking member 14 can be configured as magnetic opposite magnets, the first locking member 15 is mounted on the cavity wall of the cavity 111, the mounting groove 1221 is recessed from the surface of the connecting seat 122 in the second direction away from the valve body 11, the actuating member 16 is configured as a first spring, one end of the first spring is connected to the groove wall of the mounting groove 1221, the other end is connected to the second locking member 14, in the process of moving towards the second position, the second locking member 14 is stretched out of the mounting groove 1221 by the elastic force of the first spring and contacts the hole wall of the large diameter portion 1120, when reaching the first locking member 15, the second locking member 14 is attracted to the first locking member 15 to lock the connecting seat 122 to the valve body 11. Of course, the first locking member 15 and the second locking member 14 can also be provided as other structures capable of achieving locking cooperation, and the present disclosure does not make specific limitations thereto.

[0041] In the exemplary embodiments provided by the present disclosure, with reference to Figure 3 and Figure 4 The thimble 121 includes a body 123 and a spike portion 124, the body 123 is connected to the connecting seat 122, the spike portion 124 is connected to one end of the body 123 away from the connecting seat 122, and a step surface 126 is formed between the spike portion 124 and the body 123, the valve body 11 includes a mounting seat 112 arranged in the cavity 111 and formed with a mounting through hole 127 and a stop flange 125, the stop flange 125 is arranged on the side of the mounting through hole 127 towards the connecting seat 122 and extends inwardly along the radial direction of the mounting through hole 127, the thimble 121 is arranged in the mounting through hole 127 and the step surface 126 is used to abut against the stop flange 125. By arranging the step surface 126 and the stop flange 125 and making the step surface 126 abut against the stop flange 125, the spike portion 124 is limited in the connecting seat 122, ensuring that the thimble 121 is in a relatively stable state when the valve is not opened, wherein the mounting through hole 127 plays a guiding role, improving the stability of the thimble 121 during movement and ensuring that the thimble 121 can smoothly pierce the isolation film 13 when the valve is opened.

[0042] In the exemplary embodiments provided by the present disclosure, with reference to Figure 1 and Figure 2As shown in FIG. 1, the battery pack explosion-proof valve 1 further comprises an elastic member 17, the elastic member 17 is sleeved on the body 123, and one end of the elastic member 17 abuts against the connecting seat 122 and the other end abuts against the stop flange 125. By arranging the elastic member 17, when the ejector pin 121 moves towards the isolation film 13 (i.e. when the ejector pin 121 moves to the second position), the ejector pin 121 is subjected to a damping force applied by the elastic member 17, thereby improving the stability of the ejector pin 121 during movement. In addition, by arranging the elastic member 17, sufficient spacing is reserved between the ejector pin 121 and the isolation film 13, thereby avoiding the problem of accidental opening of the valve due to accidental puncture of the isolation film 13 by the ejector pin 121.

[0043] In the example embodiments provided by the present disclosure, reference is made to Figures 1 to 3 As shown in FIG. 1, the elastic member 17 is configured as a second spring. Of course, the elastic member 17 can also be configured as other structures with higher elasticity, such as an elastic rubber sleeve, and the present disclosure does not make specific limitations in this regard.

[0044] In the example embodiments provided by the present disclosure, reference is made to Figure 3 As shown in FIG. 1, the connecting seat 122 can be provided with a plug hole 1222, and the body 123 is plugged into the plug hole 1222 and fixedly connected with the plug hole 1222. By such arrangement, the processing is facilitated, and the assembly of the battery pack explosion-proof valve 1 is facilitated. In addition, the reliability of the connection between the body 123 and the connecting seat 122 is ensured.

[0045] In the example embodiments provided by the present disclosure, reference is made to Figure 1 and Figure 2 As shown in FIG. 1, the ejector pin 121 is provided with a gas gathering hole 1211 extending from the end face of the body 123 away from the piercing portion 124 towards the piercing portion 124. By arranging the gas gathering hole 1211, when the valve is opened, the gas in the battery pack can enter the gas gathering hole 1211, a large amount of gas is gathered in the gas gathering hole 1211 and pushes the ejector pin 121 to drive the connecting seat 122 to move, thereby facilitating the movement of the ejector pin assembly 12.

[0046] The second aspect of the present disclosure further provides a battery pack comprising a pack body and further comprising the above-mentioned battery pack explosion-proof valve 1, the battery pack explosion-proof valve 1 being installed on the pack body and comprising the cavity 111 and the isolation film 13, the isolation film 13 being arranged in the cavity 111 for isolating the internal space of the pack body from the external environment. The battery pack also has all the advantages of the above-mentioned battery pack explosion-proof valve 1, which will not be repeated here.

[0047] The third aspect of the present disclosure further provides a power consumption device comprising the above-mentioned battery pack. The power consumption device can be a vehicle, an energy storage cabinet, an aircraft, etc., and the present disclosure does not make specific limitations in this regard.

[0048] Reference is made to Figures 1 to 4The use process of the battery pack explosion-proof valve provided by the present disclosure will be described in detail below.

[0049] When the valve is not opened, the ejector assembly 12 is in the first position (i.e. Figure 1 In the state shown in the figure, the connecting seat 122 is in sealing contact with the cavity wall of the valve body 11 to seal the second opening 120, and at the same time, the second locking member 14 is retracted into the mounting groove 1221, and there is a gap between the ejector 121 and the isolation film 13. When the internal pressure of the battery pack reaches the explosion pressure of the battery pack explosion-proof valve, that is, the closed space and the gas collecting hole 1211 are filled with gas, the valve opening action is started, that is, the connecting seat 122 moves to the second position under the action of the gas pressure. When the connecting seat 122 moves to the second position (i.e. Figure 2 In the state shown in the figure), the actuator 16 causes the second locking member 14 to extend from the mounting groove 1221 to lock with the first locking member 15, so as to lock the connecting seat 122 to the valve body 11. At this time, the ejector 121 has pierced the isolation film 13, and a gap is formed between the connecting seat 122 and the cavity wall of the valve body 11, so that the gas flowing out from the inside of the battery pack continues to pass through the gap to the first opening 110, and is discharged from the first opening 110 to the outside, realizing the rapid pressure relief of the battery pack.

[0050] The preferred embodiments of the present disclosure are described in detail above in combination with the drawings, but the present disclosure is not limited to the specific details in the above-described embodiments. Within the technical concept range of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all belong to the protection range of the present disclosure.

[0051] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combination manners.

[0052] In addition, various different embodiments of the present disclosure can also be combined in any manner, as long as they do not deviate from the idea of the present disclosure, and they should also be considered as disclosed by the present disclosure.

Claims

1. A battery pack explosion-proof valve, characterized in that: The battery pack explosion-proof valve includes: a valve body, the valve body forming a cavity and provided with a first locking member; an isolation diaphragm connected to the valve body and used to close the cavity; an ejector assembly, the ejector assembly being slidably arranged in the cavity along a first direction, the ejector assembly comprising an ejector and a connecting seat connected to each other, the connecting seat being provided with a second locking member, the second locking member being configured to lock and cooperate with the first locking member to maintain the ejector in a position for puncturing the isolation membrane; The battery pack explosion-proof valve further includes an actuating member, wherein one of the valve body and the connecting seat is provided with a locking groove, and the other is provided with a mounting groove; The ejector pin assembly has a first position, in which the second locking member is retracted into the mounting groove, the connecting seat is in sealing contact with the cavity wall of the valve body to seal the second opening, and a gap is formed between the ejector pin and the isolation diaphragm; The ejector assembly has a second position. In the second position, the actuator causes the second locking member to extend from the mounting groove to lock with the first locking member, a gap is formed between the connecting seat and the cavity wall of the valve body, and the ejector pierces the isolation membrane. The cavity has a first opening and a second opening arranged opposite to each other in the first direction. The isolation membrane is arranged at the first opening and is used to close the first opening. The cavity includes a small-diameter portion and a large-diameter portion connected to each other. The second opening is formed in the small-diameter portion. The small-diameter portion is configured as a constant-diameter hole. The aperture of the large-diameter portion gradually increases from the small-diameter portion toward the first opening. In the first position, the connection seat is in sealing contact with the cavity wall of the small-diameter portion, and in the second position, the gap is formed between the connection seat and the large-diameter portion.

2. The battery pack explosion-proof valve according to claim 1, characterized in that: One of the first locking member and the second locking member is used as the locking groove, and the other of the first locking member and the second locking member is connected to the mounting groove via the actuating member, and the actuating member is used to cause the one of the first locking member and the second locking member connected to the mounting groove to extend out of the mounting groove to lock with the locking groove.

3. The battery pack explosion-proof valve according to claim 2, characterized in that: The valve body is provided with the locking groove, and the connecting seat is provided with the mounting groove. The locking groove is recessed from the cavity wall of the cavity along the second direction away from the connecting seat, and the mounting groove is recessed from the surface of the connecting seat along the second direction away from the valve body. The actuating member is constructed as a first spring, one end of the first spring is connected to the groove wall of the mounting groove, and the other end is connected to the second locking member.

4. The battery pack explosion-proof valve according to claim 1, characterized in that: The ejector pin includes a body and a spike portion, wherein the body is connected to the connecting seat, the spike portion is connected to one end of the body away from the connecting seat, and a step surface is formed between the spike portion and the body. The valve body includes a mounting seat, which is arranged in the cavity and is formed with a mounting through hole and a stop flange, wherein the stop flange is provided on a side of the mounting through hole facing the connecting seat and extends radially inwardly along the mounting through hole. The ejector pin is passed through the mounting through hole and the step surface is used to abut against the stop flange.

5. The battery pack explosion-proof valve according to claim 4, characterized in that: The battery pack explosion-proof valve further includes an elastic member, which is sleeved on the body and has one end abutting against the connecting seat and the other end abutting against the stop flange.

6. The battery pack explosion-proof valve according to claim 5, characterized in that: The elastic member is configured as a second spring.

7. The battery pack explosion-proof valve according to claim 4, characterized in that: The connecting seat is provided with a plug-in hole, and the body is plugged into the plug-in hole and fixedly connected to the plug-in hole.

8. The battery pack explosion-proof valve according to claim 4, characterized in that: The ejector pin is provided with an air gathering hole, and the air gathering hole extends from the end surface of the body away from the spike portion toward the spike portion.

9. A battery pack, comprising a pack body, characterized in that: It also includes a battery pack explosion-proof valve according to any one of claims 1 to 8, wherein the battery pack explosion-proof valve is installed on the package body and includes a cavity and an isolation membrane, and the isolation membrane is arranged in the cavity to isolate the internal space of the package body from the external environment.

10. An electrical device, characterized in that: Comprising the battery pack according to claim 9.

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