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

Abstract

A battery pack explosion-proof valve, a battery pack, and an electrical device. The battery pack explosion-proof valve comprises a valve body, an isolation film, and a rupture pin assembly. The valve body is formed with a cavity and provided with a first locking member. The isolation film is connected to the valve body and used for closing the cavity. The rupture pin assembly is slidably arranged in the cavity in a first direction. The rupture pin assembly comprises a rupture pin and a connecting base connected to each other. A second locking member is provided on the connecting base, and the second locking member is used for being matched and locked with the first locking member.

Description

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

[0001] Cross-reference to related applications

[0002] The present disclosure claims priority to the Chinese patent application No. 202411383911.7, filed on September 27, 2024, and entitled "Battery pack explosion-proof valve, battery pack and electric equipment", the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of battery explosion-proof valves, in particular to a battery pack explosion-proof valve, a battery pack and an electric equipment. BACKGROUND

[0004] 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, resulting in that the gas in the battery pack cannot be completely exhausted. SUMMARY

[0005] The purpose of the present disclosure is to provide a battery pack explosion-proof valve which can completely exhaust the gas in the battery pack and is beneficial to quickly depressurize the battery pack.

[0006] In order to achieve the above purpose, according to a first aspect of the embodiments of the present disclosure, a battery pack explosion-proof valve is provided, which comprises: a valve body, the valve body is formed with a cavity, and the valve body is provided with a first locking piece; an isolation membrane, the isolation membrane is connected to the valve body, and the isolation membrane is used to close the cavity; and 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, and the second locking piece is used to lock and cooperate with the first locking piece, so that the needle is kept at a position of piercing the isolation membrane.

[0007] 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, and 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, and the other of the first locking piece and the second locking piece is connected to the mounting groove through the actuating piece, and the actuating piece is used to make 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 and cooperate with the locking groove.

[0008] 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, the actuating member 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 member.

[0009] Optionally, the cavity has a first opening and a second opening arranged oppositely in the first direction, the isolation film is arranged at the first opening, and the isolation film is used to close the first opening.

[0010] Optionally, the top needle assembly has a first position, in which the second locking member is retracted into the mounting groove, the connecting seat is in sealed 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.

[0011] Optionally, the top needle assembly has a second position, in which the actuating member causes the second locking member to protrude out of the mounting groove to enable the second locking member to be locked with the first locking member, the connecting seat and the cavity wall of the valve body form a gap therebetween, and the top needle pierces the isolation film.

[0012] Optionally, the cavity includes a small-diameter portion and a large-diameter portion connected in sequence, the second opening is formed in the small-diameter portion, the small-diameter portion is configured as an equal-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 sealed 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.

[0013] Optionally, the top needle includes a body and a sharp portion, the body is connected to the connecting seat, the sharp portion is connected to one end of the body away from the connecting seat, and a stepped surface is formed between the sharp portion and the body, the valve body includes a mounting seat arranged in the cavity, the mounting seat is formed with a mounting through hole and a stop flange, the stop flange is arranged on one side of the mounting through hole toward the connecting seat and extends inward in the radial direction of the mounting through hole, the top needle is arranged in the mounting through hole, and the stepped surface is used to abut against the stop flange.

[0014] 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.

[0015] Optionally, the elastic member is configured as a second spring.

[0016] Optionally, the connecting seat is provided with a plug hole, the body is plugged into the plug hole, and the body is fixedly connected with the plug hole.

[0017] Optionally, the thimble is provided with a gas collecting hole extending from an end face of the body away from the sharp portion towards the sharp portion.

[0018] According to a second aspect of the embodiments of the present disclosure, a battery pack is provided, the battery pack comprising a pack body, the battery pack further comprising the battery pack explosion-proof valve described above, the battery pack explosion-proof valve being mounted to the pack body, and the battery pack explosion-proof valve comprising a cavity and a separation membrane, the separation membrane being arranged in the cavity for separating an internal space of the pack body from an external environment.

[0019] According to a third aspect of the embodiments of the present disclosure, a power consumption device is provided, the power consumption device comprising the battery pack described above.

[0020] Through the above technical solution, in the battery pack explosion-proof valve provided by the present disclosure, the valve body, the separation membrane and the thimble assembly are provided, the first locking member is arranged on the valve body, the thimble assembly comprises the thimble 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 to the valve body through the locking cooperation of the second locking member and the first locking member, and then the thimble assembly is locked to the valve body, so that the thimble is kept at the position of piercing the separation membrane, 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. In addition, through the locking cooperation of the second locking member and the first locking member, the battery pack explosion-proof valve can keep a stable exhaust capacity, which is beneficial to rapid pressure relief.

[0021] Other features and advantages of the present disclosure will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0022] 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:

[0023] Fig. 1 is a schematic view of the closed valve state of the battery pack explosion-proof valve provided by the exemplary embodiments of the present disclosure;

[0024] Fig. 2 is a schematic view of the open valve state of the battery pack explosion-proof valve provided by the exemplary embodiments of the present disclosure;

[0025] Fig. 3 is a schematic view of the state when the connecting seat of the battery pack explosion-proof valve provided by the exemplary embodiments of the present disclosure abuts and seals with the valve body.

[0026] FIG. 4 is a schematic view of the installation of the mounting seat of the battery pack explosion-proof valve and the needle according to an example embodiment of the present disclosure;

[0027] FIG. 5 is a schematic view of the relationship between the battery pack explosion-proof valve, the battery pack and the electrical equipment according to an example embodiment of the present disclosure. DETAILED DESCRIPTION

[0028] The specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present disclosure, and are not intended to limit the present disclosure.

[0029] In the present disclosure, the orientation words such as "first direction, second direction" are used with reference to FIG. 1, where the L1 direction refers to the first direction, and the L2 direction refers to the second direction. In addition, "inner, outer" refers to "inner, outer" with respect to the outline of the corresponding component itself. In addition, the terms "first", "second" and the like used in the present disclosure are used to distinguish one element from another element, and do not have sequential and important meanings. In addition, in the following description, when referring to the drawings, the same reference numerals in different drawings represent the same or similar elements, unless otherwise explained. The above definitions are only used to explain and illustrate the present disclosure, and should not be understood as limiting the present disclosure.

[0030] According to the specific embodiments of the present disclosure, referring to FIGS. 1-4, 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 the valve body 11 is provided with a first locking member 15; a separation membrane 13 connected to the valve body 11, and the separation membrane 13 is used to close the cavity 111; and a needle assembly 12 arranged in the cavity 111 along the first direction, the needle assembly 12 includes a needle 121 and a connecting seat 122 connected thereto, the connecting seat 122 is provided with a second locking member 14, and the second locking member 14 is used to lock and cooperate with the first locking member 15, so that the needle 121 is kept at the position of piercing the separation membrane 13.

[0031] 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 2 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.

[0032] 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 2 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 realize opening of the valve, after the separation film 13 is pierced, the gas in the battery pack 2 can be quickly discharged from the cavity 111 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.

[0033] In the exemplary embodiment provided by the present disclosure, referring to FIGS. 1 to 3, the battery pack explosion-proof valve 1 further comprises an actuating piece 16, one of the valve body 11 and the connecting seat 122 is provided with a locking groove 151, and the other is provided with a mounting groove 1221, one of the first locking piece 15 and the second locking piece 14 serves as the locking groove 151, and the other of the first locking piece 15 and the second locking piece 14 is connected to the mounting groove 1221 through the actuating piece 16, and the actuating piece 16 is used for causing the one of the first locking piece 15 and the second locking piece 14 connected to the mounting groove 1221 to extend out of the mounting groove 1221 to lock cooperate with the locking groove 151. In the above technical scheme, one of the first locking piece 15 and the second locking piece 14 is located in the mounting groove 1221, when the actuating piece 16 acts, the one of the first locking piece 15 and the second locking piece 14 located in the mounting groove 1221 extends out of the mounting groove 1221 to lock cooperate with the first locking piece 15, so that the first locking piece 15 and the second locking piece 14 can be timely locked and cooperated.

[0034] In the example embodiment provided in the present disclosure, referring to FIGS. 1-3, the valve body 11 is provided with a locking groove 151, the connecting seat 122 is provided with a mounting groove 1221, the locking groove 151 is recessed from the cavity wall of the cavity 111 in the second direction away from the connecting seat 122, 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 piece 16 is configured as a first spring, one end of the first spring is connected to the groove wall 1220 of the mounting groove 1221, and the other end of the first spring is connected to the second locking piece 14. In the above technical solution, the first spring has elasticity, when the mounting groove 1221 is opposite to the locking groove 151, the second locking piece 14 is extended from the mounting groove 1221 under the elastic force of the first spring and inserted into the locking groove 151 to be locked with the locking groove 151, thus, the automatic locking of the second locking piece 14 and the first locking piece 15 is realized.

[0035] In the example embodiment provided in the present disclosure, referring to FIGS. 1 and 2, the cavity 111 can have a first opening 110 and a second opening 120 arranged oppositely in the first direction, the isolation film 13 is arranged at the first opening 110, and the isolation film 13 is 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 2.

[0036] In the example embodiment provided in the present disclosure, referring to FIG. 1, the thimble assembly 12 has a first position, in which the second locking piece 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 thimble 121 has a spacing 101 with the isolation film 13, when in the first position, the valve is in a closed state (please refer to FIG. 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 a closed space is formed between the end of the connecting seat 122 close to the second opening 120 and the valve body 11 when the battery pack explosion-proof valve is not opened, so that when the internal gas pressure of the battery pack 2 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, the movement of the connecting seat 122 drives the thimble 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.

[0037] In the exemplary embodiment provided in the present disclosure, referring to FIG. 2, the top pin assembly 12 has a second position, in which the actuating member 16 causes the second locking member 14 to protrude from the mounting groove 1221 to form a locking fit with the first locking member 15, a gap 102 is formed between the connecting seat 122 and the cavity wall of the valve body 11, and the top pin 121 pierces the isolation film 13. In the second position, i.e., when the valve is open (see FIG. 2), because the gap 102 is formed between the connecting seat 122 and the cavity wall of the valve body 11, the gas can pass through the gap 102 to the first opening 110 and be discharged through the first opening 110. Here, because in the second position, the actuating member 16 causes the second locking member 14 to protrude from the mounting groove 1221 to form a locking fit with the first locking member 15, in the second position, the top pin assembly 12 is locked to the valve body 11, and the gap 102 is always maintained between the connecting seat 122 and the cavity wall of the valve body 11, so the gas can continue to be discharged, ensuring that all the gas in the battery pack 2 is discharged, and facilitating rapid pressure relief of the battery pack 2.

[0038] It should be noted that because when the valve is not open, i.e., when the valve is closed, the connecting seat 122 is in sealing contact with the cavity wall of the valve body 11 to form a sealed space, and the sealed space is in communication with the inside of the battery pack 2, therefore, the isolation film 13 can be a waterproof and breathable film, which has good waterproof and breathable properties, can prevent liquid from entering the cavity, and can also achieve the discharge of the gas in the cavity 111. In this way, after the valve is opened, part of the gas can be directly discharged to the outside through the waterproof and breathable film, improving the discharge efficiency. The isolation film 13 can be connected to the valve body 11 in any suitable manner, as an exemplary embodiment, the isolation film 13 can be welded to the valve body 11, and the present disclosure does not make specific limitations thereto.

[0039] In the example embodiment provided in the present disclosure, referring to FIG. 1 and FIG. 2, the cavity 111 can include a small-diameter portion 1110 and a large-diameter portion 1120 connected in sequence, the second opening 120 is formed in the small-diameter portion 1110, the small-diameter portion 1110 is configured as a constant-diameter hole, the hole diameter of the large-diameter portion 1120 gradually increases from the small-diameter portion 1110 towards the first opening 110, at the first position, the connecting seat 122 is in sealing contact with the cavity wall of the small-diameter portion 1110, at the second position, a gap 102 is formed between the connecting seat 122 and the large-diameter portion 1120. By such arrangement, the connecting seat 122 is in sealing contact with the small-diameter portion 1110, forming a closed space, when the internal gas pressure of the battery pack 2 reaches the explosion pressure of the battery pack explosion valve, the pressure of the gas pushes the connecting seat 122 to drive the ejector pin 121 to move towards the first opening 110, due to the gradually increasing hole diameter of the large-diameter portion 1120 from the small-diameter portion 1110 towards the first opening 110, as the connecting seat 122 moves, the gap 102 gradually increases, the exhaust volume increases, which is beneficial 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 beneficial to the smooth pushing of the connecting seat 122 by the gas, thereby further improving the efficiency of exhaust and pressure relief.

[0040] In the present disclosure, the small-diameter portion 1110 is configured as a constant-diameter hole, which is beneficial to the connection of the small-diameter portion 1110 with the battery pack 2.

[0041] In another example embodiment provided in the present disclosure, the first locking member 15 and the second locking member 14 can be configured as magnetic bodies with opposite magnetic properties, the first locking member 15 is installed 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 1220 of the mounting groove 1221, the other end is connected to the second locking member 14, during the movement of the connecting seat 122 towards the second position, the second locking member 14 is stretched out of the mounting groove 1221 under the elastic force of the first spring, and is in contact with the hole wall of the large-diameter portion 1120, when the first locking member 15 is reached, the second locking member 14 is attracted to the first locking member 15 with opposite magnetic properties, so as 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 in other structures capable of achieving locking cooperation, and the present disclosure does not make specific limitations in this regard.

[0042] In the example embodiment provided in the present disclosure, referring to FIG. 3 and FIG. 4, the top pin 121 comprises a body 123 and a spike 124, the body 123 is connected to the connecting base 122, the spike 124 is connected to one end of the body 123 away from the connecting base 122, and a stepped surface 126 is formed between the spike 124 and the body 123, the valve body 11 comprises a mounting base 112 arranged in the cavity 111, and the mounting base 112 is 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 base 122, and the stop flange 125 extends inwardly along the radial direction of the mounting through hole 127, the top pin 121 is arranged in the mounting through hole 127, and the stepped surface 126 is used to abut against the stop flange 125. By arranging the stepped surface 126 and the stop flange 125, and abutting the stepped surface 126 against the stop flange 125, the spike 124 is limited in the connecting base 122, and the stability of the top pin 121 during movement is improved, and the spike 124 can smoothly pierce the isolation film 13 when the valve is opened.

[0043] In the example embodiment provided in the present disclosure, referring to FIG. 1 and FIG. 2, the battery pack explosion-proof valve 1 further comprises an elastic member 17, the elastic member 17 is sleeved on the body 123, one end of the elastic member 17 abuts against the connecting base 122, and the other end of the elastic member 17 abuts against the stop flange 125. By arranging the elastic member 17, when the top pin 121 moves towards the isolation film 13 (i.e. when the top pin 121 moves towards the second position), the damping force exerted by the elastic member 17 is applied to the top pin 121, thereby improving the stability of the top pin 121 during movement, and in addition, by arranging the elastic member 17, sufficient space is reserved between the top pin 121 and the isolation film 13, thereby avoiding the problem of false opening of the valve due to accidental piercing of the isolation film 13 by the top pin 121.

[0044] In the example embodiment provided in the present disclosure, referring to FIG. 1 to FIG. 3, the elastic member 17 is configured as a second spring, of course, the elastic member 17 can also be configured as other structures with high elasticity, such as an elastic rubber sleeve, and the present disclosure does not make specific limitations in this regard.

[0045] In the example embodiment provided in the present disclosure, referring to FIG. 3, the connecting base 122 can be provided with a plug hole 1222, the body 123 is plugged into the plug hole 1222, and the body 123 is 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, and in addition, the reliability of the connection between the body 123 and the connecting base 122 is ensured.

[0046] In the example embodiment provided in the present disclosure, referring to FIG. 1 and FIG. 2, the top needle 121 is provided with a gas gathering hole 1211 extending from the end face of the body 123 away from the piercing part 124 towards the piercing part 124. By providing the gas gathering hole 1211, when the valve is opened, the gas in the battery pack 2 can enter the gas gathering hole 1211, a large amount of gas gathers in the gas gathering hole 1211, and the top needle 121 is pushed to drive the connecting seat 122 to move, which facilitates better driving of the movement of the top needle assembly 12.

[0047] In a second aspect of the present disclosure, referring to FIG. 5, a battery pack is also provided. The battery pack 2 comprises a pack body, and further comprises the battery pack explosion-proof valve 1 described above. The battery pack explosion-proof valve 1 is installed on the pack body, and comprises the cavity 111 and the isolation film 13 arranged in the cavity 111 for isolating the internal space of the pack body from the external environment. The battery pack 2 also has all the advantages of the battery pack explosion-proof valve 1 described above, which will not be repeated here.

[0048] In a third aspect of the present disclosure, a use electric device 3 is also provided, which comprises the battery pack 2 described above. The use electric device 3 can be a vehicle, an energy storage cabinet, an aircraft, etc., and the present disclosure does not make specific limitations thereto.

[0049] Referring to FIG. 1 to FIG. 4, the use process of the battery pack explosion-proof valve provided in the present disclosure will be described in detail below.

[0050] When the valve is not opened, the top needle assembly 12 is located at the first position (i.e., the state shown in FIG. 1), at this time, 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 101 between the top needle 121 and the isolation film 13. When the internal pressure of the battery pack 2 reaches the explosion pressure of the battery pack explosion-proof valve, that is, the closed space and the gas gathering 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, and when the connecting seat 122 moves to the second position (i.e., the state shown in FIG. 2), the actuator 16 causes the second locking member 14 to extend out of the mounting groove 1221 to lock with the first locking member 15, thereby locking the connecting seat 122 to the valve body 11. At this time, the top needle 121 has pierced the isolation film 13, and a gap 102 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 2 continuously passes through the gap 102 to the first opening 110 and is discharged to the outside from the first opening 110, thereby achieving rapid pressure relief of the battery pack 2.

[0051] The preferred embodiments of the present disclosure are described in detail above with reference to the drawings, but the present disclosure is not limited to the specific details in the above-described embodiments. Various simple modifications can be made to the technical solutions of the present disclosure within the technical concept of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0052] 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, various possible combinations are not described again in the present disclosure.

[0053] 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 in the present disclosure.

Claims

1. A battery pack explosion relief valve, characterized by, The battery pack explosion-proof valve (1) comprises: a valve body (11) formed with a cavity (111), and provided with a first locking piece (15); a separation film (13) connected to the valve body (11) and used for closing the cavity (111); and a thimble assembly (12) slidingly arranged in the cavity (111) along a first direction, comprising a thimble (121) and a connecting seat (122) connected thereto, the connecting seat (122) being provided with a second locking piece (14) used for locking cooperation with the first locking piece (15) to keep the thimble (121) at a position of piercing the separation film (13).

2. The battery pack explosion relief valve of claim 1, wherein, The battery pack explosion-proof valve (1) further comprises an actuating piece (16), one of the valve body (11) and the connecting seat (122) is provided with a locking groove (151), the other is provided with a mounting groove (1221), one of the first locking piece (15) and the second locking piece (14) serves as the locking groove (151), the other of the first locking piece (15) and the second locking piece (14) is connected to the mounting groove (1221) through the actuating piece (16), and the actuating piece (16) is used for causing the one of the first locking piece (15) and the second locking piece (14) connected to the mounting groove (1221) to protrude out of the mounting groove (1221) to lock cooperate with the locking groove (151).

3. The battery pack explosion relief valve of claim 2, wherein, The valve body (11) is provided with the locking groove (151), the connecting seat (122) is provided with the mounting groove (1221), the locking groove (151) is recessed from a cavity wall of the cavity (111) in a second direction away from the connecting seat (122), the mounting groove (1221) is recessed from a surface of the connecting seat (122) in the second direction away from the valve body (11), and the actuating piece (16) is configured as a first spring, one end of the first spring is connected to a groove wall (1220) of the mounting groove (1221), and the other end of the first spring is connected to the second locking piece (14).

4. The battery pack explosion relief valve of any one of claims 1-3, wherein, The cavity (111) has a first opening (110) and a second opening (120) oppositely arranged in the first direction, the separation film (13) is arranged at the first opening (110) and used for closing the first opening (110).

5. The battery pack explosion relief valve of claim 4, wherein, The thimble assembly (12) has a first position, in which the second locking piece (14) is retracted into the mounting groove (1221), the connecting seat (122) is in sealing contact with a cavity wall of the valve body (11) to seal the second opening (120), and the thimble (121) has a spacing (101) with the separation film (13).

6. The battery pack explosion relief valve of claim 5, wherein, The ejector pin assembly (12) has a second position, in which the actuating member (16) causes the second locking member (14) to protrude from the mounting groove (1221) to lock with the first locking member (15), a gap (102) is formed between the connecting seat (122) and the cavity wall of the valve body (11), and the ejector pin (121) pierces the isolation film (13).

7. The battery pack explosion relief valve of claim 6, wherein, The cavity (111) comprises a small-diameter portion (1110) and a large-diameter portion (1120) connected in sequence, the second opening (120) is formed in the small-diameter portion (1110), the small-diameter portion (1110) is configured as a constant-diameter hole, and the hole diameter of the large-diameter portion (1120) gradually increases 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), and in the second position, the gap (102) is formed between the connecting seat (122) and the large-diameter portion (1120).

8. The battery pack explosion relief valve of any of claims 1-7, wherein, The ejector pin (121) comprises a body (123) and a piercing portion (124), the body (123) is connected to the connecting seat (122), the piercing portion (124) is connected to one end of the body (123) away from the connecting seat (122), and a stepped surface (126) is formed between the piercing portion (124) and the body (123), The valve body (11) comprises a mounting seat (112) arranged in the cavity (111), and the mounting seat (112) is formed with a mounting through hole (127) and a stop flange (125), the stop flange (125) is arranged on one side of the mounting through hole (127) toward the connecting seat (122), and the stop flange (125) extends inwardly along the radial direction of the mounting through hole (127), The ejector pin (121) penetrates the mounting through hole (127), and the stepped surface (126) is used to abut against the stop flange (125).

9. The battery pack explosion relief valve of claim 8, wherein, The battery pack explosion-proof valve (1) further comprises an elastic member (17), the elastic member (17) is sleeved on the body (123), one end of the elastic member (17) abuts against the connecting seat (122), and the other end of the elastic member (17) abuts against the stop flange (125).

10. The battery pack explosion relief valve of claim 9, wherein, The elastic member (17) is configured as a second spring.

11. The battery pack explosion relief valve of any of claims 8-10, wherein, The connecting seat (122) is provided with a plug hole (1222), the body (123) is plugged into the plug hole (1222), and the body (123) is fixedly connected with the plug hole (1222).

12. The battery pack explosion relief valve of any of claims 8-10, wherein, The ejector pin (121) is provided with a gas collecting hole (1211) extending from the end surface of the body (123) away from the piercing portion (124) toward the piercing portion (124).

13. A battery pack, the battery pack (2) comprising a pack body, characterized in that The battery pack (2) further comprises a battery pack explosion relief valve (1) according to any one of claims 1 to 12, which is installed to the pack body, and which comprises a cavity (111) and a separation membrane (13) arranged in the cavity (111) for separating the internal space of the pack body from the external environment.

14. An electrical device, characterized by The power consuming device (3) comprises a battery pack (2) according to claim 13.

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