Explosion-proof valve and battery pack

Abstract

The utility model discloses a kind of explosion-proof valve and battery pack, explosion-proof valve includes: valve body, with the first passage for airflow to flow through;Membrane paper, set in the valve body, and located in one end of the first passage, the membrane paper is configured to be able to arch towards the first passage;Thimble, set in the first passage, for puncturing the membrane paper;Fixed seat and guide piece, the fixed seat is set in the valve body and located in the first passage, the guide piece is connected the fixed seat, configured to be able to be pushed by the membrane paper to move relative to the fixed seat, the thimble is connected the guide piece, configured to move towards the membrane paper side under the drive of the moving guide piece.The explosion-proof valve and battery pack of the utility model can realize rapid pressure relief.

Description

Technical Field

[0001] This utility model relates to the field of battery component technology, and in particular to an explosion-proof valve and a battery pack. Background Technology

[0002] Explosion-proof valves are used to release high-pressure gases inside sealed enclosures such as battery packs to prevent explosions caused by excessive internal pressure. Taking a needle-type explosion-proof valve as an example, it has a waterproof and breathable membrane that exchanges air with the outside. When the pressure inside the battery pack reaches a certain level, the waterproof and breathable membrane expands and arches, approaching the needle until it punctures, thus releasing pressure. However, this puncture action takes a long time and cannot achieve rapid explosion. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes an explosion-proof valve capable of quickly puncturing the membrane paper to release pressure.

[0004] This utility model also proposes a battery pack having the above-mentioned explosion-proof valve.

[0005] The explosion-proof valve according to a first aspect embodiment of the present invention includes:

[0006] The valve body has a primary channel for airflow.

[0007] A membrane paper is disposed on the valve body and located at one end of the first channel, the membrane paper being configured to arch toward the first channel;

[0008] A pin, positioned within the first channel, is used to puncture the membrane paper;

[0009] A fixed seat and a guide are provided, the fixed seat being disposed in the valve body and located within the first channel, the guide being connected to the fixed seat and configured to be pushed by the membrane paper to move relative to the fixed seat, and the ejector pin being connected to the guide and configured to move toward the membrane paper side under the drive of the moving guide.

[0010] The explosion-proof valve according to the embodiment of this utility model has at least the following beneficial effects: the ejector pin is disposed in the first channel. When the membrane paper arches towards the first channel under high pressure, that is, when the membrane paper moves towards the ejector pin, the arched membrane paper will push the guide member to move relative to the fixed member. The moving guide member drives the ejector pin to move towards the membrane paper, thereby making the membrane paper and the ejector pin move relative to each other. This can reduce the time to puncture the membrane paper, quickly depressurize the battery pack, reduce its internal air pressure, and achieve pressure balance inside and outside the battery pack.

[0011] According to some embodiments of the present invention, the guide includes a guide seat and a slider. The guide seat is movable relative to the fixed seat in a first direction under the push of the film paper. The slider is configured to be driven to move toward a second direction when the guide seat moves in the first direction. The first direction intersects with the second direction.

[0012] The ejector pin is configured to be driven to move toward a third direction when the slider moves toward the second direction, the first direction being opposite to the third direction.

[0013] According to some embodiments of the present invention, the guide seat and the fixed seat surround a receiving cavity, and the slider and the ejector pin are disposed within the receiving cavity;

[0014] The guide seat includes a guide seat body and a first protrusion disposed on the guide seat body and protruding inward. The first protrusion has a first guide surface that is inclined to the first direction. The slider has a second guide surface. The guide seat, which moves along the first direction, cooperates with the second guide surface through the first guide surface to drive the slider to move along the second direction.

[0015] According to some embodiments of the present invention, the guide seat includes a second protrusion disposed on the guide seat body and protruding inward, the second protrusion having a fifth guide surface inclined to the first direction, the fifth guide surface being parallel to the first guide surface;

[0016] The second guide surface is located at one end of the slider, and the slider has a sixth guide surface at the other end for cooperating with the fifth guide surface.

[0017] According to some embodiments of the present invention, the slider includes a first segment, a second segment, and a third segment connecting the first segment and the second segment. The first segment is parallel to the second segment and both intersect with the third segment.

[0018] The first segment and the second segment are used to cooperate with the guide seat, and the third segment is used to cooperate with the ejector pin.

[0019] According to some embodiments of the present invention, the guide seat and the fixed seat surround a receiving cavity, and the slider and the ejector pin are disposed within the receiving cavity;

[0020] The guide seat has a through hole for the ejector pin to extend out, and the explosion-proof valve also includes an elastic element, which provides elastic force to prevent the ejector pin from extending out of the through hole.

[0021] According to some embodiments of the present invention, the fixing seat has a boss in the middle of the side facing the guide portion, a sliding groove is formed on the boss, the sliding groove extends in a second direction, the slider passes through the sliding groove and can move along the sliding groove.

[0022] According to some embodiments of the present invention, one of the outer wall of the guide member and the inner wall of the fixing seat is provided with a slot, and the other is provided with a plug. The plug cooperates with the slot to position the fixing seat and the guide member in the circumferential direction.

[0023] According to some embodiments of the present invention, the explosion-proof valve includes two protective covers, which are disposed on the valve body and respectively located at one end of the first channel. The membrane paper is located between the two protective covers. The valve body has a first support ring, and the guide member is supported on the first support ring along the first direction at one end away from the fixed seat. The fixed seat is supported on the protective cover at one end away from the guide member.

[0024] According to some embodiments of the present invention, the guide member includes a guide seat, the guide seat includes a guide seat body and a second support ring disposed on the guide seat body and protruding radially outward, a portion of the guide seat body is disposed within the first support ring, and the second support ring abuts against the first support ring along the first direction.

[0025] A battery pack according to a second aspect of the present invention includes an explosion-proof valve and a housing, wherein the explosion-proof valve is mounted on the housing.

[0026] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0028] Figure 1 This is a schematic diagram of the structure of the explosion-proof valve according to an embodiment of the present utility model;

[0029] Figure 2 This is a front view of an embodiment of the present utility model;

[0030] Figure 3 for Figure 2 AA section view;

[0031] Figure 4 for Figure 3 A magnified view of part B;

[0032] Figure 5This is an explosion diagram of the explosion-proof valve according to an embodiment of the present invention.

[0033] Figure label:

[0034] 100. Valve body; 100a. First channel; 110. First support ring;

[0035] 200. Film paper;

[0036] 300, ejector pin; 310, annular retaining ring; 300a, fourth guide surface;

[0037] 400, Fixing base; 410, Boss; 410a, Slide groove; 410b, Slot; 410c, Guide groove;

[0038] 500. Guide components;

[0039] 510. Guide seat; 511. Guide seat body; 512. First protrusion; 512a. First guide surface; 513. Second protrusion; 513a. Fifth guide surface; 511a. Through hole; 514. Insert block; 515. Second support ring; 520. Slider; 520a. Second guide surface; 520b. Sixth guide surface; 521. First segment; 522. Second segment; 523. Third segment;

[0040] 600, elastic element; 700, protective cover; 800, first sealing ring; 20, second sealing ring. Detailed Implementation

[0041] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0042] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, 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 this utility model.

[0043] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0044] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0045] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0046] Please refer to Figures 1-5 This application provides an explosion-proof valve suitable for battery packs, which releases pressure when the battery pack is under high pressure. The explosion-proof valve includes a valve body 100, a diaphragm 200, a pin 300, a fixing seat 400, and a guide 500. The valve body 100 has a first channel 100a for airflow. During pressure relief, the high-pressure airflow inside the battery pack flows out through the first channel 100a to the outside.

[0047] Please refer to Figures 3-5 The ejector pin 300 is set in the first channel 100a and is used to puncture the membrane paper 200.

[0048] The membrane paper 200 is disposed on the valve body 100 and located at one end of the first channel 100a. The membrane paper 200 can arch towards the first channel 100a. It can be understood that when the membrane paper 200 arches towards the first channel 100a, that is, towards the ejector pin 300, the gap between the membrane paper 200 and the ejector pin 300 decreases until the arching is high enough, at which point the ejector pin 300 punctures the arched membrane paper 200.

[0049] It should be noted that the membrane paper 200 is a waterproof and breathable membrane paper 200. When the internal air pressure of the battery pack is lower than the preset value, gas can pass through the membrane paper 200 to the outside, achieving a balance between the internal pressure of the battery pack and the external air pressure. When the internal air pressure of the battery pack is higher than the preset value, the membrane paper 200 arches towards the pin 300.

[0050] The fixed seat 400 is disposed in the valve body 100 and located in the first channel 100a. The guide 500 is connected to the fixed seat 400 and is configured to be pushed by the arched membrane paper 200 toward the first channel 100a to move relative to the fixed seat 400. The ejector pin 300 is connected to the guide 500 and is configured to move toward the membrane paper 200 side under the drive of the moving guide 500.

[0051] In the above embodiment, the ejector pin 300 is disposed in the first channel 100a. When the membrane paper 200 arches towards the first channel 100a under high pressure, that is, when the membrane paper 200 moves towards the ejector pin 300, the arched membrane paper 200 will push the guide member 500 to move relative to the fixed member. The moving guide member 500 drives the ejector pin 300 to move towards the side of the membrane paper 200, thereby making the membrane paper 200 and the ejector pin 300 move relative to each other. This can reduce the time to puncture the membrane paper 200, quickly depressurize the battery pack, reduce its internal air pressure, and achieve pressure balance inside and outside the battery pack.

[0052] It is understandable that the guide 500 can drive the ejector pin 300 to move in any way.

[0053] In some embodiments, the guide 500 includes a guide seat 510 and a slider 520. The guide seat 510 is movable relative to the fixed seat 400 along a first direction, wherein the first direction is substantially the same as the arching direction of the film 200, or in other words, the first direction is substantially coincident with the extension direction of the first channel 100a.

[0054] The slider 520 is configured to be driven by the guide seat 510 to move toward a second direction as the guide seat 510 moves along a first direction, wherein the first direction intersects the second direction. In some embodiments, the first direction is perpendicular to the second direction.

[0055] The ejector pin 300 is configured to move in a third direction when the slider 520 moves in the second direction. The first direction is opposite to the third direction; that is, the ejector pin 300 is driven to move in the opposite direction to the arching direction of the film paper 200, thus enabling the ejector pin 300 to quickly pierce the film paper 200. By using the slider 520 as a motion transmission element between the guide seat 510 and the ejector pin 300, reverse motion transmission can be achieved, and the spatial layout is relatively more flexible and stable.

[0056] It is understood that the method by which the guide seat 510 drives the slider 520 to move is not limited. In some embodiments, the guide seat 510 and the fixed seat 400 enclose a receiving cavity, and the slider 520 and the ejector pin 300 are disposed within the receiving cavity. The guide seat 510 includes a base plate and a sidewall surrounding the base plate. The base plate is circular, and the base plate and the sidewall together enclose a first opening. The base plate and the sidewall of the fixed seat 400 enclose a second opening, and the guide seat 510 is partially inserted into the second opening to enclose the receiving cavity with the fixed seat 400.

[0057] The guide seat 510 includes a guide seat body 511 and a first protrusion 512 disposed on the guide seat body 511 and protruding inward. The first protrusion 512 has a first guide surface 512a inclined in a first direction, located on the upward-facing surface of the first protrusion 512. The slider 520 has a second guide surface 520a located on the surface of the slider 520 facing the film material. The guide seat 510, moving along the first direction, drives the slider 520 to move along the second direction through the engagement of the first guide surface 512a and the second guide surface 520a. In other words, the transmission and reversal of movement between the guide seat 510 and the slider 520 are achieved through the engagement of two guide surfaces inclined in the first direction.

[0058] It is understood that the way the slider 520 drives the ejector pin 300 to move is not limited. In some embodiments, the slider 520 has a third guide surface that is inclined to the first direction and is located on the downward surface of the slider 520. The ejector pin 300 has a fourth guide surface 300a that cooperates with the third guide surface and the fourth guide surface 300a is the top surface of the ejector pin 300.

[0059] In some specific embodiments, the fixed base 400 has a boss 410 in the middle of the side facing the guide base 510. A guide groove 410c is formed on the boss 410, extending along the direction of the first channel 100a. One end of the top surface of the ejector pin 300 extends into the guide groove 410c. A sliding groove 410a is formed on the boss 410, extending along the second direction. The sliding groove 410a laterally penetrates the boss 410 and connects to the guide groove 410c. The slider 520 passes through the sliding groove 410a and can move along the sliding groove 410a. The third guide surface of the slider 520 is aligned with the fourth guide surface 300a of the ejector pin 300. The sliding groove 410a constrains the movement direction of the slider 520, thereby keeping it aligned with the first guide surface 512a and preventing offset. The guide groove 410c constrains the movement direction of the ejector pin 300, thereby limiting its relative position with the slider 520 and transmitting motion.

[0060] The ejector pin 300 has an annular retaining ring 310, which can abut against the boss 410, thereby limiting the depth of the ejector pin 300 into the guide groove 410c. It also includes an elastic element 600, which acts on the annular retaining ring 310 to keep the annular retaining ring 310 in contact with the boss 410.

[0061] The slider 520, moving along the second direction, engages with the fourth guide surface 300a via the third guide surface, driving the ejector pin 300 to move along the third direction, thereby piercing the membrane material. It can be understood that the transmission and reversal of movement between the slider 520 and the ejector pin 300 are achieved through the engagement of two guide surfaces inclined in the first direction. Specifically, the second guide surface 520a of the slider 520 intersects with the third guide surface.

[0062] In some embodiments, the guide seat 510 includes a second protrusion 513 disposed on the guide seat body 511 and protruding inward. The second protrusion 513 has a fifth guide surface 513a inclined in a first direction, and the fifth guide surface 513a is parallel to the first guide surface 512a. It should be noted that, since the fifth guide surface 513a is parallel to the first guide surface 512a, when the slider 520 is displaced relative to the guide seat 510, the sliding distance between the first guide surface 512a and the second guide surface 520a is the same as the sliding distance between the fifth guide surface 513a and the sixth guide surface 520b.

[0063] The second guide surface 520a is located at one end of the slider 520, and the slider 520 has a sixth guide surface 520b at the other end for engaging with the fifth guide surface 513a. Thus, the position of one end of the slider 520 can be constrained by the first guide surface 512a and the second guide surface 520a, and the position of the other end of the slider 520 can be constrained by the fifth guide surface 513a and the sixth guide surface 520b, thereby providing a more stable constraint on the position of the slider 520 along the second direction.

[0064] In some embodiments, the slider 520 includes a first segment 521, a second segment 522, and a third segment 523 connecting the first segment 521 and the second segment 522. The first segment 521 is parallel to the second segment 522 and both intersect with the third segment 523. The first segment 521 and the second segment 522 are used to cooperate with the guide seat 510, and the third segment 523 is used to cooperate with the ejector pin 300.

[0065] Furthermore, the surface of the first segment 521 facing the membrane paper 200 is the second guide surface 520a, and the first guide surface 512a, which mates with the second guide surface 520a, is the surface of the first protrusion 512 facing the fixed base 400. When the two are engaged, the first guide surface 512a can provide support. The surface of the second segment 522 facing away from the membrane paper 200 is the sixth guide surface 520b, and the fifth guide surface 513a, which mates with the sixth guide surface 520b, is the surface of the second protrusion 513 facing the membrane paper 200, thereby limiting the second segment 522 of the slider 520 from moving away from the membrane paper 200. The surface of the second segment 522 facing the membrane paper 200 is the third guide surface, and the top surface of the ejector pin 300 constitutes the fourth guide surface 300a. The two work together to drive the ejector pin 300.

[0066] In some embodiments, the guide seat 510 has a through hole 511a for the ejector pin 300 to extend out. The explosion-proof valve also includes an elastic element 600, which provides elastic force to prevent the ejector pin 300 from extending out of the through hole 511a and puncturing the membrane material. It is understood that the pointed end of the ejector pin 300 faces the membrane material, and the elastic element 600 provides elastic force to maintain a safe distance between the ejector pin 300 and the membrane material, avoiding the risk of accidental puncture of the membrane material due to vibration or other factors, thereby improving the service life and reliability of the explosion-proof valve in the working environment.

[0067] For example, the elastic element 600 is a spring, which is in a pre-compressed state to provide elastic force to keep the ejector pin 300 in contact with the slider 520. Specifically, one end of the spring is connected to the ejector pin 300, and the other end of the spring is connected to the guide seat 510, and the other end of the spring surrounds the through hole 511a, with one pointed end of the ejector pin 300 inside the spring.

[0068] To facilitate the circumferential positioning of the guide 500 and the fixed base 400, in some embodiments, one of the outer wall of the guide 500 and the inner wall of the fixed base 400 is provided with a slot 410b, and the other is provided with a plug 514. The plug 514 cooperates with the slot 410b to position the circumferential position of the fixed base 400 and the guide 500.

[0069] In some specific embodiments, the outer wall of the guide seat 510 has an outwardly protruding insert 514, and the inner wall of the fixed seat 400 has a slot 410b, which can radially penetrate the inner wall of the fixed seat 400. The insert 514 of the guide seat 510 is aligned with and inserted into the slot 410b of the fixed seat 400, so that part of the guide seat 510 can be inserted into the fixed seat 400. The two are positioned by the mating slot 410b and insert 514. This facilitates the positioning and movement transmission of the slider 520 provided at the slide groove 410a of the fixed seat 400 and the guide seat 510.

[0070] In some embodiments, the explosion-proof valve includes two protective covers 700, each with a plurality of vent holes. A valve body 100 is mounted on each of the two protective covers 700 and is located at one end of a first channel 100a. A membrane 200 is located between the two protective covers 700. A first sealing ring 800 is provided between the membrane 200 and one of the protective covers 700, and the first sealing ring 800 is sandwiched between the two.

[0071] The valve body 100 has a first support ring 110. Along the first direction, the guide 500 is supported on the first support ring 110 at one end away from the fixed seat 400, and the fixed seat 400 is supported on the protective cover 700 at one end away from the guide 500, thereby realizing the installation of the guide 500 and the fixed seat 400.

[0072] The elastic element 600 provides elastic force, keeping the fixed seat 400 abutting against the protective cover 700 and the guide seat 510 abutting against the support ring. In some specific embodiments, the elastic force of the elastic element 600 acts on the ejector pin 300 and is transmitted through the ejector pin 300 to the boss 410 of the fixed seat 400, thereby causing the fixed seat 400 to tend to move away from the guide seat 510. This tendency causes the fixed seat 400 to be abutted against the protective cover 700. The elastic force of the elastic element 600 also acts on the guide seat 510, thereby providing a tendency for the elastic seat to move away from the fixed seat 400, thus realizing the installation of the guide element 500 and the fixed seat 400.

[0073] In some embodiments, the guide seat 510 includes a guide seat body 511 and a second support ring 515 disposed on the guide seat body 511 and protruding radially outward. The guide seat body 511 is disposed within the first support ring 110, and the second support ring 515 abuts against the first support ring 110 along a first direction. It is understood that the first support ring 110 can position and constrain the guide seat body 511 located on the inner side, preventing it from moving in any direction perpendicular to the first direction.

[0074] This application also provides a battery pack, including an explosion-proof valve and a housing, with the explosion-proof valve mounted on the housing. In some specific embodiments, the housing has an inner cavity and a threaded groove communicating with the inner cavity, and the outer wall of the valve body 100 is threaded, with the valve body 100 being installed through the engagement of the thread and the threaded groove. A second sealing ring 20 is provided between the housing and the explosion-proof valve.

[0075] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. An explosion-proof valve, characterized in that, include: The valve body has a primary passage for airflow. A membrane paper is disposed on the valve body and located at one end of the first channel, the membrane paper being configured to arch toward the first channel; A pin, positioned within the first channel, is used to puncture the membrane paper; A fixed seat and a guide are provided, the fixed seat being disposed in the valve body and located within the first channel, the guide being connected to the fixed seat and configured to be pushed by the membrane paper to move relative to the fixed seat, and the ejector pin being connected to the guide and configured to move toward the membrane paper side under the drive of the moving guide.

2. The explosion-proof valve according to claim 1, characterized in that, The guide includes a guide seat and a slider. The guide seat is movable relative to the fixed seat in a first direction under the push of the film paper. The slider is configured to be driven to move toward a second direction when the guide seat moves in the first direction. The first direction intersects the second direction. The ejector pin is configured to be driven to move toward a third direction when the slider moves toward the second direction, the first direction being opposite to the third direction.

3. The explosion-proof valve according to claim 2, characterized in that, The guide seat and the fixed seat enclose a receiving cavity, and the slider and the ejector pin are disposed within the receiving cavity; The guide seat includes a guide seat body and a first protrusion disposed on the guide seat body and protruding inward. The first protrusion has a first guide surface that is inclined to the first direction. The slider has a second guide surface. The guide seat, which moves along the first direction, cooperates with the second guide surface through the first guide surface to drive the slider to move along the second direction.

4. The explosion-proof valve according to claim 3, characterized in that, The guide seat includes a second protrusion disposed on the guide seat body and protruding inward, the second protrusion having a fifth guide surface inclined to the first direction, the fifth guide surface being parallel to the first guide surface; The second guide surface is located at one end of the slider, and the slider has a sixth guide surface at the other end for cooperating with the fifth guide surface.

5. The explosion-proof valve according to claim 2, characterized in that, The slider comprises a first segment, a second segment, and a third segment connecting the first segment and the second segment. The first segment is parallel to the second segment and both intersect with the third segment. The first segment and the second segment are used to cooperate with the guide seat, and the third segment is used to cooperate with the ejector pin.

6. The explosion-proof valve according to claim 2, characterized in that, The guide seat and the fixed seat enclose a receiving cavity, and the slider and the ejector pin are disposed within the receiving cavity; The guide seat has a through hole for the ejector pin to extend out, and the explosion-proof valve also includes an elastic element, which provides elastic force to prevent the ejector pin from extending out of the through hole.

7. The explosion-proof valve according to claim 2, characterized in that, The fixed base has a boss in the middle of the side facing the guide seat, and a groove is formed on the boss. The groove extends in a second direction, and the slider passes through the groove and can move along the groove.

8. The explosion-proof valve according to claim 7, characterized in that, One of the outer wall of the guide member and the inner wall of the fixing seat is provided with a slot, and the other is provided with a plug. The plug cooperates with the slot to position the fixing seat and the guide member in the circumferential direction.

9. The explosion-proof valve according to claim 2, characterized in that, The explosion-proof valve includes two protective covers, which are disposed on the valve body and respectively located at one end of the first channel. The membrane paper is located between the two protective covers. The valve body has a first support ring. The guide member is supported on the first support ring along the first direction at one end away from the fixed seat, and the fixed seat is supported on the protective cover at one end away from the guide member. And / or, The guide member includes a guide seat, the guide seat includes a guide seat body and a second support ring disposed on the guide seat body and protruding radially outward, a portion of the guide seat body is disposed within the first support ring, and the second support ring abuts against the first support ring along the first direction.

10. A battery pack, characterized in that, It includes the explosion-proof valve as described in any one of claims 1-9 and the housing, wherein the explosion-proof valve is mounted on the housing.

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