Explosion-proof valve and battery pack

Abstract

The utility model relates to the technical field of anti-explosion valves, in particular to an anti-explosion valve and a battery pack. The explosion-proof valve is applied to the battery pack, a mounting hole for mounting the explosion-proof valve is formed in a first end face of a box body of the battery pack, the explosion-proof valve comprises a valve body, a valve hole penetrating in the first direction is formed in the valve body, and the peripheral wall of the valve body is used for being connected with the inner wall of the mounting hole; the valve element comprises a valve rod and an element cover which are connected, the valve rod is arranged in the valve hole in a sliding mode, and a pressure relief channel is formed between the valve rod and the inner wall of the valve hole; the two ends of the elastic piece make contact with the valve body and the valve element respectively. The core cover is used for being in sealed connection with the box body to seal the pressure relief channel. According to the explosion-proof valve, gas flowing through the pressure relief channel and gas flowing through the gap between the valve body and the box body can be sealed at the same time through the sealing position between the core cover and the box body, and therefore the number of the sealing positions after the explosion-proof valve is assembled to the box body is reduced.

Description

TECHNICAL FIELD

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

[0002] The battery pack is the power source of an electric vehicle, and its safety performance is crucial. The battery pack may be caused by overcharging, short circuit or being punctured during use. The internal temperature and pressure of the battery pack rise sharply, and a large amount of high-temperature gas is generated. At this time, the gas needs to be discharged to the outside of the vehicle body through the explosion-proof valve to avoid the explosion of the battery pack due to excessive internal gas pressure.

[0003] However, the current explosion-proof valve has two seals after being assembled to the box of the battery pack, resulting in a complex sealing structure. CONTENT OF THE UTILITY MODEL

[0004] The present application discloses an explosion-proof valve and a battery pack, which can reduce the number of sealing places of the explosion-proof valve after being assembled to the box.

[0005] In order to achieve the above-mentioned purpose, in a first aspect, the present application discloses an explosion-proof valve applied to a battery pack, a first end surface of a box of the battery pack is provided with a mounting hole for mounting the explosion-proof valve, and the explosion-proof valve comprises:

[0006] a valve body, the valve body is provided with a valve hole penetrating in a first direction, and an outer peripheral wall of the valve body is used for connecting with an inner wall of the mounting hole;

[0007] a valve core, the valve core comprises a valve rod and a core cover connected with each other, the valve rod is slidably arranged in the valve hole, and a pressure relief channel is formed between the valve rod and the inner wall of the valve hole;

[0008] an elastic member, two ends of the elastic member are in contact with the valve body and the valve core respectively;

[0009] the core cover is used for sealing connection with the box to seal the pressure relief channel.

[0010] In an optional embodiment, the core cover has a part radially protruding from the outer peripheral wall of the valve body, and an end surface of the valve rod connected with the core cover is used for sealing cooperation with the box.

[0011] In an optional embodiment, the end surface of the valve rod connected with the core cover is provided with an annular groove arranged around the valve rod, and a sealing ring is arranged in the annular groove, and the sealing ring is used for sealing cooperation with the box.

[0012] In an optional embodiment, the outer peripheral wall of the valve body is provided with an external thread structure used for screwing connection with the mounting hole.

[0013] In an alternative embodiment, a rotation-stopping structure is arranged between the valve body and the valve core, and is configured to limit rotation of the valve core about a straight line along the first direction.

[0014] In an alternative embodiment, the outer peripheral wall of the valve body is provided with rotation-stopping protrusions, which are spaced apart from the external thread structure along the first direction, and the core cover is provided with rotation-stopping grooves, in which the rotation-stopping protrusions are located, and the rotation-stopping structure comprises the rotation-stopping protrusions and the rotation-stopping grooves.

[0015] In an alternative embodiment, along the circumferential direction of the valve body, a gap is formed between the rotation-stopping protrusions and the rotation-stopping grooves.

[0016] In an alternative embodiment, the core cover has a portion with a polygonal cross-sectional outer profile.

[0017] In an alternative embodiment, the elastic member is sleeved on the outer peripheral wall of the valve rod, two ends of the elastic member are distributed along the first direction, one end of the valve rod away from the core cover is provided with a first abutting portion, and one end of the valve body close to the core cover is provided with a second abutting portion, and the elastic member abuts between the first abutting portion and the second abutting portion.

[0018] In an alternative embodiment, the valve rod comprises a first rod portion and a second rod portion connected detachably, the first rod portion is connected with the core cover, and the first abutting portion is arranged at one end of the second rod portion away from the first rod portion.

[0019] In an alternative embodiment, a pressure relief hole is arranged in the core cover, the pressure relief hole has a first hole opening and a second hole opening, the first hole opening is directed towards the valve hole and communicates with the valve hole, and the second hole opening is arranged on the outer surface of the core cover.

[0020] In an alternative embodiment, the explosion-proof valve further comprises a waterproof and air-permeable membrane, which is arranged on the core cover and covers the second hole opening.

[0021] The explosion-proof valve further comprises a protective cover, which cooperates with the core cover to form a containing space, the waterproof and air-permeable membrane is arranged in the containing space, and an air-permeable hole is arranged between the protective cover and the core cover, and is configured to communicate the containing space with the external environment.

[0022] In a second aspect, the application provides a battery pack comprising the explosion-proof valve according to any one of the above embodiments, and the battery pack comprises a box body, a first end surface of the box body is provided with a mounting hole, and the outer peripheral wall of the valve body is connected with the inner wall of the mounting hole.

[0023] In an alternative embodiment, a sealing ring is arranged between the box and the core cover to seal the pressure relief channel.

[0024] In an alternative embodiment, the core cover has a portion radially protruding from the outer peripheral wall of the valve body, and the core cover is connected in sealing fit with the end face of the valve stem and the first end face.

[0025] Compared with the related art, the present application has the following advantages:

[0026] In the present application, the explosion-proof valve comprises a valve body and a valve core, the valve body is provided with a valve hole, the valve core comprises a valve stem and a core cover connected with each other, the valve stem is slidably arranged in the valve hole, and a pressure relief channel is formed between the valve stem and the inner wall of the valve hole. When the explosion-proof valve of the present application is applied to the box of a battery pack, the outer peripheral wall of the valve body can be connected with the inner wall of the mounting hole on the box, and the core cover is sealingly connected with the box. Therefore, the gas flowing through the pressure relief channel is sealed at the sealing part between the core cover and the box, and the gas flowing through the gap between the valve body and the box is also sealed at the sealing part between the core cover and the box. It can be seen that the present application can seal the gas flowing through the pressure relief channel and the gas flowing through the gap between the valve body and the box at the same sealing part between the core cover and the box. Therefore, it is not necessary to seal the gas flowing through the pressure relief channel and the gas flowing through the gap between the valve body and the box separately as in the related art, so that the number of sealing parts of the explosion-proof valve after being assembled to the box is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0028] Figure 1 A sectional view of the explosion-proof valve disclosed in the embodiments of the present application;

[0029] Figure 2 An assembly view of the explosion-proof valve and the box disclosed in the embodiments of the present application;

[0030] Figure 3 An exploded view of the explosion-proof valve disclosed in the embodiments of the present application;

[0031] Figure 4 A top view of the explosion-proof valve disclosed in the embodiments of the present application;

[0032] Figure 5 A gas flow schematic diagram of the explosion-proof valve disclosed in the embodiments of the present application in a state;

[0033] Figure 6A gas flow schematic view of the explosion-proof valve disclosed in the embodiments of the present application in another state.

[0034] Explanation of reference signs:

[0035] 100, valve body; 110, valve hole; 120, rotation-stopping protrusion; 130, second abutting portion; 200, valve core; 210, valve rod; 211, first rod portion; 212, second rod portion; 2121, first abutting portion; 220, core cover; 221, annular groove; 222, rotation-stopping groove; 223, pressure relief hole; 310, pressure relief channel; 320, waterproof air permeable film; 400, elastic member; 500, sealing ring; 600, protective cover; 700, box body; 701, first end face; 710, mounting hole. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present application.

[0037] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not intended to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0038] In addition, in addition to indicating the orientation or positional relationship, the above-mentioned part of the terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. Those of ordinary skill in the art can understand the specific meaning of these terms in the present application according to the specific situation.

[0039] In addition, the terms "mounting", "setting", "provided with", "connection", "connected" should be broadly understood. For example, it can be fixedly connected, detachably connected, or integrally constructed; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. Those of ordinary skill in the art can understand the specific meaning of the above terms in the present application according to the specific situation.

[0040] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0041] The battery pack is the power source of an electric vehicle, and its safety performance is of paramount importance. During use, the cells inside the battery pack may experience thermal runaway due to overcharging, short circuits, or punctures, causing a rapid increase in internal temperature and pressure, generating a large amount of high-temperature gas. In this situation, an explosion-proof valve is needed to promptly release the gas to the outside of the vehicle to prevent excessive internal pressure from causing an explosion.

[0042] The inventors discovered that current explosion-proof valves, such as the one in patent CN221170910U, include a valve body and a valve core. The valve core includes a core cover and a valve stem, with the valve stem slidably disposed within the valve body. A first sealing ring is provided between the valve body and the core cover to seal the contact surface between the core cover and the valve body. A second sealing ring is provided on the side of the valve body away from the core cover, surrounding the outer wall of the valve body. The second sealing ring is used to seal the mounting surface between the valve body and the battery pack housing.

[0043] As can be seen from the above analysis, when the current explosion-proof valve is assembled onto the battery pack housing, the pressure relief channel between the valve core and the valve body is sealed by the first sealing ring, and the gap between the valve body and the housing is sealed by the second sealing ring. In other words, there are two seals after the explosion-proof valve is assembled onto the battery pack housing, resulting in a complex sealing structure.

[0044] The explosion-proof valve and battery pack provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0045] Please see Figures 1 to 3 This application discloses an explosion-proof valve applied to a battery pack. The first end face 701 of the battery pack housing 700 is provided with a mounting hole 710 for installing the explosion-proof valve. The explosion-proof valve includes:

[0046] Valve body 100, the valve body 100 having a first direction ( Figure 1 The valve body 100 has a through-hole 110 (in the direction indicated by the x-arrow line) and its outer peripheral wall is used to connect with the inner wall of the mounting hole 710. For example, the outer peripheral wall of the valve body 100 can be connected to the inner wall of the mounting hole 710 by ultrasonic welding, threaded connection, snap-fit, or other methods.

[0047] The valve core 200 includes a valve stem 210 and a core cover 220 connected to each other, the valve stem 210 is slidably arranged in the valve hole 110, and a pressure relief channel 310 is formed between the valve stem 210 and the inner wall of the valve hole 110. Specifically, the core cover 220 is located on one side of the valve body 100 in the first direction.

[0048] The elastic member 400 has two ends respectively in contact with the valve body 100 and the valve core 200, so as to provide a restoring force of the valve core 200 from the core cover 220 to the valve stem 210, thereby driving the valve core 200 to move in the first direction towards the valve body 100. Optionally, the elastic member 400 can be configured to apply a force of the valve core 200 from the core cover 220 to the valve stem 210 when the explosion-proof valve is applied to the battery pack, so that the core cover 220 abuts against the box body 700. The elastic member 400 can be a spring, a spring sheet, an elastic sleeve, etc., and the specific structure of the elastic member 400 is not limited in the present application.

[0049] The core cover 220 is used for sealing connection with the box body 700 to seal the pressure relief channel 310.

[0050] In the present application, the explosion-proof valve includes a valve body 100 and a valve core 200, the valve body 100 is provided with a valve hole 110, the valve core 200 includes a valve stem 210 and a core cover 220 connected to each other, the valve stem 210 is slidably arranged in the valve hole 110, and a pressure relief channel 310 is formed between the valve stem 210 and the inner wall of the valve hole 110. When the explosion-proof valve is applied to the box body 700 of the battery pack, the outer peripheral wall of the valve body 100 can be connected to the inner wall of the mounting hole 710 on the box body 700, and the core cover 220 is sealingly connected to the box body 700, so that the gas flowing through the pressure relief channel 310 is sealed at the sealing position between the core cover 220 and the box body 700, and the gas flowing through the gap between the valve body 100 and the box body 700 is also sealed at the sealing position between the core cover 220 and the box body 700. It can be seen that the present application can seal the gas flowing through the pressure relief channel 310 and the gas flowing through the gap between the valve body 100 and the box body 700 at the same sealing position between the core cover 220 and the box body 700, so as to reduce the number of sealing positions of the explosion-proof valve after being assembled to the box body 700.

[0051] Please refer to Figure 2 and Figure 5When the explosion-proof valve of the present application is applied to a battery pack, the specific pressure relief process is as follows: when the gas pressure in the box 700 is too high, the force of the high-pressure gas acting on the core cover 220 is greater than the sum of the elastic force provided by the elastic member 400 and the gravity of the valve core 200 and other structures, the core cover 220 will slide in the first direction away from the valve body 100 under the action of the high-pressure gas to open the pressure relief passage 310, and the gas in the pressure relief passage 310 will diffuse outward from the gap between the core cover 220 and the box 700 to reduce the gas pressure in the box 700. In this process, the elastic member 400 is elastically deformed. When the gas pressure in the box 700 gradually decreases, the gas pressure difference between the inside and outside of the box 700 gradually decreases, so that the sliding speed of the core cover 220 in the first direction away from the valve body 100 decreases. When the force of the gas in the box 700 acting on the core cover 220 is less than the sum of the elastic force provided by the elastic member 400 and the gravity of the valve core 200 and other structures, the elastic member 400 restores the elastic deformation, and the core cover 220 will slide in the first direction towards the valve body 100 under the action of the elastic member 400 until the core cover 220 contacts the box 700 to shield the pressure relief passage 310.

[0052] In some embodiments, the orthographic projection of the core cover 220 in the first direction is within the orthographic projection of the area surrounded by the outer contour of the valve body 100, in which case the outer peripheral wall of the core cover 220 can be in sealing cooperation with the inner peripheral wall of the mounting hole 710 of the box 700. Thus, during the sliding process of the core cover 220 in the first direction, the sealing structure between the core cover 220 and the inner peripheral wall of the mounting hole 710 will move relative to the inner peripheral wall of the mounting hole 710 or the outer peripheral wall of the core cover 220, thereby generating a friction force in the first direction, which will affect the smoothness of the sliding of the core cover 220 in the first direction.

[0053] Please refer to Figure 1 In an alternative embodiment, the core cover 220 has a portion radially protruding from the outer peripheral wall of the valve body 100, and the end surface of the core cover 220 connected to the valve rod 210 is used for sealing cooperation with the box 700. It should be noted that the radial direction here is perpendicular to the first direction.

[0054] In order to improve the smoothness of the sliding of the core cover 220 along the first direction, the core cover 220 of the embodiment has a part radially protruding from the outer peripheral wall of the valve body 100, and the end surface of the core cover 220 connected with the valve rod 210 is used for sealing cooperation with the tank body 700, that is, the end surface of the part of the core cover 220 radially protruding from the outer peripheral wall of the valve body 100 connected with the valve rod 210 is sealingly cooperated with the tank body 700, so that the sealing structure between the core cover 220 and the tank body 700 of the embodiment is not located between the inner peripheral wall of the mounting hole 710 and the outer peripheral wall of the core cover 220, and the inner peripheral wall of the mounting hole 710 or the outer peripheral wall of the core cover 220 will not hinder the sliding of the sealing structure during the sliding of the core cover 220 along the first direction, so as to improve the smoothness of the sliding of the core cover 220 along the first direction, thereby ensuring the responsiveness of the explosion-proof valve.

[0055] Referring to Figure 1 and Figure 3 In an alternative embodiment, the end surface of the core cover 220 connected with the valve rod 210 is provided with an annular groove 221 arranged around the valve rod 210, and a sealing ring 500 is arranged in the annular groove 221, and the sealing ring 500 is used for sealing cooperation with the tank body 700, and the sealing ring 500 can be sealingly cooperated with the tank body 700 through elastic deformation of the sealing ring 500. Specifically, a part of the sealing ring 500 is located in the annular groove 221, and the other part protrudes from the annular groove 221.

[0056] In the embodiment, the end surface of the core cover 220 connected with the valve rod 210 is provided with the annular groove 221, and the sealing ring 500 is arranged in the annular groove 221, and the annular groove 221 can provide an installation reference for the installation of the sealing ring 500, so as to reduce the installation difficulty of the sealing ring 500; and the side wall of the annular groove 221 can limit the sealing ring 500, so as to prevent the sealing ring 500 from being disconnected with the core cover 220 under the action of an external force. Of course, the explosion-proof valve of the present application can also not include the sealing ring 500, and in this case, the sealing ring 500 can be arranged in the tank body 700.

[0057] Referring to Figure 3 In an alternative embodiment, the outer peripheral wall of the valve body 100 is provided with an external thread structure used for threadedly connecting with the mounting hole 710.

[0058] In the embodiment, the outer peripheral wall of the valve body 100 is provided with the external thread structure, and the external thread structure can be threadedly cooperated with the internal thread structure of the inner wall of the mounting hole 710, so that when the valve body 100 is installed, the valve body 100 can be connected with the tank body 700 by rotating the valve body 100, which can reduce the difficulty of connecting the valve body 100 with the tank body 700; and the threaded connection has sufficient strength and self-locking property, so as to ensure the stability and reliability of the connection between the valve body 100 and the tank body 700.

[0059] Since the core cover 220 of the valve core 200 is located at one side of the valve body 100, the core cover 220 will shield the valve body 100, and thus the arrangement of the core cover 220 will hinder the installer from rotating the valve body 100. In order to further reduce the difficulty of assembling the valve body 100 and the tank 700, in an alternative embodiment, a rotation-stopping structure is arranged between the valve body 100 and the valve core 200, and the rotation-stopping structure is used to limit the rotation of the valve core 200 around the straight line where the first direction is located, that is, when the valve core 200 is rotated, the valve body 100 will rotate along with the valve core 200.

[0060] In the embodiment, the rotation-stopping structure is arranged between the valve body 100 and the valve core 200, and when the valve body 100 needs to be installed into the mounting hole 710, the valve body 100 is aligned with the mounting hole 710, and the core cover 220 is rotated to drive the valve body 100 to rotate, so as to connect the valve body 100 and the tank 700. It can be seen that, after the structure of the embodiment is adopted, the valve body 100 can be connected with the mounting hole 710 by only rotating the core cover 220 without rotating the valve body 100, and the core cover 220 will not be shielded by other structures of the explosion-proof valve, which facilitates the installer to install the valve body 100 and reduces the difficulty of assembling the valve body 100 and the tank 700.

[0061] Please refer to Figure 3 and Figure 4 In an alternative embodiment, the outer peripheral wall of the valve body 100 is provided with a rotation-stopping protrusion 120, the rotation-stopping protrusion 120 is spaced apart from the external thread structure along the first direction, the core cover 220 is provided with a rotation-stopping groove 222, the rotation-stopping protrusion 120 is located in the rotation-stopping groove 222, and the rotation-stopping structure comprises the rotation-stopping protrusion 120 and the rotation-stopping groove 222.

[0062] Specific working process is as follows, when the core cover 220 is rotated, the rotation-stopping protrusion 120 on the valve core 200 will limit the cooperation with the inner wall of the rotation-stopping groove 222 along the circumferential direction of the valve body 100, so as to drive the valve body 100 to rotate, thereby connecting the valve body 100 and the mounting hole 710. And since the outer peripheral wall of the valve body 100 of the embodiment is provided with the rotation-stopping protrusion 120, the arrangement of the rotation-stopping protrusion 120 can increase the structural strength of the valve body 100, and ensure the connection stability between the valve body 100 and the tank 700. Of course, the rotation-stopping groove 222 can also be arranged on the valve body 100, and the rotation-stopping protrusion 120 can also be arranged on the core cover 220, which is not limited in the present application.

[0063] Please refer to Figure 4 In an alternative embodiment, the rotation-stopping protrusion 120 and the rotation-stopping groove 222 have a gap along the circumferential direction of the valve body 100.

[0064] In the embodiment, the stop protrusion 120 and the stop groove 222 have a gap along the circumference of the valve body 100, that is, the inner wall of the stop protrusion 120 and the stop groove 222 are not in contact along the circumference of the valve body 100, and the stop protrusion 120 and the stop groove 222 will not be in contact during the movement of the valve core 200 relative to the valve body 100 in the first direction, so as to avoid friction, thereby improving the smoothness of the movement of the valve core 200 relative to the valve body 100, and accelerating the response speed of the explosion-proof valve. Of course, the stop protrusion 120 can also be in close contact with the inner wall of the stop groove 222, which is not limited in the application.

[0065] Referring to Figure 3 In an alternative embodiment, the core cover 220 has a portion with a polygonal cross-sectional outer profile. For example, the outer circumferential wall of the core cover 220 can have a triangular, pentagonal, hexagonal, or the like cross-sectional shape, which is not limited in the application.

[0066] In the embodiment, the core cover 220 has a portion with a polygonal cross-sectional outer profile, and the edges and corners of the polygonal shape can provide uneven contact surfaces, which can limit the rotation of the object. Compared with a circular shape, the edges and corners of the polygonal shape can form more constraint points on the contact surface, thereby increasing the friction and constraint force to reduce the difficulty of rotating the core cover 220 by the installer. Of course, the cross-sectional outer profile of the core cover 220 can also have a circular shape, which is not limited in the application.

[0067] Referring to Figure 1 In an alternative embodiment, the elastic member 400 is sleeved on the outer circumferential wall of the valve rod 210, the two ends of the elastic member 400 are distributed in the first direction, the end of the valve rod 210 away from the core cover 220 has a first abutting portion 2121, the end of the valve body 100 close to the core cover 220 has a second abutting portion 130, and the elastic member 400 is abutted between the first abutting portion 2121 and the second abutting portion 130. For example, the first abutting portion 2121 can have a ring shape or an arc shape, or the first abutting portion 2121 can include a plurality of spaced protrusions, and the specific structure of the first abutting portion 2121 is not limited in the application; the second abutting portion 130 can have a ring shape or an arc shape, or the second abutting portion 130 can include a plurality of spaced protrusions, and the specific structure of the second abutting portion 130 is not limited in the application.

[0068] In the embodiment, the elastic member 400 is sleeved on the outer periphery of the valve rod 210, the valve rod 210 can provide stable support for the elastic member 400, ensure that the elastic member 400 maintains the correct installation position during operation, avoid the failure of the elastic member 400 due to deviation or deformation, and the valve rod 210 is a rigid structure as a whole, which can enhance the ability of the elastic member 400 to withstand lateral force; and one end of the elastic member 400 abuts against the first abutting portion 2121, and the other end of the elastic member 400 abuts against the second abutting portion 130, so that the two ends of the elastic member 400 do not need to be fixed with the valve rod 210 and the valve body 100, and the installation difficulty of the elastic member 400 is simplified. Of course, the two ends of the elastic member 400 can also be distributed in the radial direction, for example, the elastic member 400 is a spring leaf, and this distribution mode can be adopted, and the application does not limit this.

[0069] Please refer to Figure 1 In an alternative embodiment, the valve rod 210 includes a first rod portion 211 and a second rod portion 212 connected detachably, the first rod portion 211 is connected with the core cover 220, and the first abutting portion 2121 is arranged at one end of the second rod portion 212 away from the first rod portion 211. For example, the first rod portion 211 and the second rod portion 212 can be connected detachably by thread connection, clamping, screw connection and the like; for example, the end surface of the first rod portion 211 away from the core cover 220 is provided with a threaded hole, and the second rod portion 212 is threadedly connected with the threaded hole.

[0070] In the embodiment, the valve rod 210 includes a first rod portion 211 and a second rod portion 212 connected detachably, in the assembly of the elastic member 400, the first rod portion 211 and the second rod portion 212 can be separated first, then the elastic member 400 is sleeved on the outer periphery of the first rod portion 211, and then the second rod portion 212 is arranged in the elastic member 400, and the second rod portion 212 is connected with the first rod portion 211. Similarly, when the elastic member 400 needs to be disassembled, the first rod portion 211 and the second rod portion 212 can be separated, and the elastic member 400 can be removed. It can be seen that, after the structure of the embodiment is adopted, the assembly and disassembly of the elastic member 400 are more convenient.

[0071] Please refer to Figure 1 and Figure 3 In an alternative embodiment, the core cover 220 is provided with a pressure relief hole 223, the pressure relief hole 223 has a first hole and a second hole, the first hole is directed to the valve hole 110 and communicates with the valve hole 110, and the second hole is arranged on the outer surface of the core cover 220. For example, the second hole can be arranged on the end surface of the core cover 220 away from the valve rod 210, or on the peripheral wall of the core cover 220.

[0072] Please refer to Figure 6When the explosion-proof valve of the present embodiment is applied to the battery pack, if the gas pressure in the box 700 is slightly greater than the gas pressure of the external environment, and the force of the gas acting on the core cover 220 is less than the sum of the elastic force provided by the elastic member 400 and the gravity of the valve core 200 and other structures, the gas in the box 700 can be released to the external environment in time through the pressure relief hole 223 in the core cover 220, so as to balance the pressure of the internal and external environments of the box 700; only when the gas pressure in the box 700 is too large, the gas can rush through the gap between the core cover 220 and the box 700 and be discharged quickly. It can be seen that, after the structure of the present embodiment is adopted, as long as the pressure in the box 700 is greater than the pressure of the external environment, the gas in the box 700 can be discharged in time through the pressure relief hole 223 to release pressure.

[0073] In addition, when the temperature of the external environment of the battery pack is too high, or the temperature of the internal environment of the battery pack is too low, the pressure in the box 700 of the battery pack can be less than the pressure of the external environment, at which time the gas of the external environment can flow into the internal environment through the pressure relief hole 223, so as to balance the pressure of the internal and external environments of the box 700.

[0074] Please refer to Figure 3 In an alternative embodiment, the explosion-proof valve further comprises a waterproof and breathable membrane 320, which is arranged on the core cover 220 and covers the second aperture. For example, when the second aperture is provided with an end surface of the core cover 220 facing away from the valve rod 210, the waterproof and breathable membrane 320 can be arranged on the end surface of the core cover 220 facing away from the valve rod 210. It should be noted that the present embodiment can be implemented independently of the next embodiment.

[0075] In the present embodiment, the waterproof and breathable membrane 320 contains pores (not shown in the figure) inside, the spacing of the pores is greater than the particle size of the gas molecules, and less than the particle size of the liquid molecules and the particle size of the solid molecules, so that the waterproof and breathable membrane 320 can ensure the gas exchange effect on the two opposite sides, while blocking the liquid and solid impurities from passing through the waterproof and breathable membrane 320, so that the gas exchange on the two opposite sides of the waterproof and breathable membrane 320 can be realized, and the gas on the two opposite sides of the explosion-proof valve can be exchanged through the waterproof and breathable membrane 320, the pressure relief hole 223 and the pressure relief channel 310.

[0076] Since the waterproof and breathable membrane 320 is relatively thin and is easy to be scratched under the action of external force, in a further embodiment, the explosion-proof valve further comprises a protective cover 600, which cooperates with the core cover 220 to form a containing space, the waterproof and breathable membrane 320 is arranged in the containing space, and a breathable hole is arranged between the protective cover 600 and the core cover 220, which is used to communicate the containing space with the external environment. For example, the protective cover 600 can be connected with the core cover 220 by clamping, bonding or the like.

[0077] In the embodiment, the protective cover 600 cooperates with the core cover 220 to form a containing space, and the waterproof and breathable film 320 is arranged in the containing space. The protective cover 600 can block impurities with large mass in the external environment from entering the containing space, thereby reducing damage of impurities in the external environment to the waterproof and breathable film 320, and further ensuring the blocking effect of the waterproof and breathable film 320 on liquid and solid impurities and the permeation effect of the waterproof and breathable film 320 on gas.

[0078] In some embodiments, the end face of the core cover 220 away from the valve rod 210 is provided with a plurality of arc-shaped platforms, the plurality of arc-shaped platforms are spaced apart along the circumference of the core cover 220, and the protective cover 600 is arranged on the end face of the arc-shaped platform away from the core cover 220. The core cover 220, the plurality of arc-shaped platforms and the protective cover 600 jointly form the above-mentioned containing space, and the gap between adjacent two arc-shaped platforms is used to communicate the containing space and the external environment. Further, the arc-shaped platform is provided with a glue storage groove extending along the circumference of the core cover 220. The design of the glue storage groove can increase the amount of glue between the protective cover 600 and the core cover 220, and improve the connection stability of the two.

[0079] Please refer to Figure 2 The application further discloses a battery pack comprising the explosion-proof valve of any of the above-mentioned embodiments. The battery pack comprises a box body 700, and the first end face 701 of the box body 700 is provided with a mounting hole 710, and the outer peripheral wall of the valve body 100 is connected with the inner wall of the mounting hole 710. Since the battery pack comprises the explosion-proof valve of any of the above-mentioned embodiments, the battery pack has the beneficial effects of the explosion-proof valve, which will not be described herein again.

[0080] Please refer to Figure 2 In an alternative embodiment, a sealing ring 500 is arranged between the box body 700 and the core cover 220 to seal the pressure relief channel 310. The sealing ring 500 can be sealingly connected with the box body 700 through elastic deformation of the sealing ring 500. For example, the sealing ring 500 can be arranged on the box body 700 or the core cover 220.

[0081] Please refer to Figure 2 In an alternative embodiment, the core cover 220 has a portion radially protruding from the outer peripheral wall of the valve body 100, and the core cover 220 is sealingly connected with the end face of the valve rod 210 and the first end face 701.

[0082] In the embodiment, the core cover 220 is in sealing cooperation with the end surface of the valve stem 210 and the first end surface 701, that is, the sealing position between the core cover 220 and the box body 700 is located between the core cover 220 and the first end surface 701, and the box body 700 has no boss or other solid structure on the side of the first end surface 701. After the gas in the box body 700 is discharged from between the core cover 220 and the first end surface 701, the box body 700 does not hinder the flow of the gas, so that the ventilation capacity of the explosion-proof valve is increased and the response speed of the explosion-proof valve is accelerated. Of course, the end surface of the core cover 220 connected with the valve stem 210 can also not be in sealing cooperation with the first end surface 701, and at this time, the mounting hole 710 can be designed as a stepped hole, and the end surface of the core cover 220 connected with the valve stem 210 is in sealing cooperation with the stepped surface.

[0083] The above embodiments of the present application mainly describe the differences between the various embodiments, and the different optimization features between the various embodiments can be combined to form a more optimal embodiment without contradiction. In view of the brevity of the writing, the above will not be repeated. The embodiments of the present application are described above in combination with the drawings, but the present application is not limited to the above specific embodiments, and the above specific embodiments are only illustrative and not restrictive. Those skilled in the art can make many forms under the inspiration of the present application without departing from the scope of the present application, and all forms belong to the protection of the present application.

Claims

1. An explosion-proof valve applied to a battery pack, wherein the first end face (701) of the battery pack housing (700) is provided with a mounting hole (710) for installing the explosion-proof valve, characterized in that, The explosion-proof valve includes: A valve body (100) is provided with a valve hole (110) extending in a first direction, and the outer peripheral wall of the valve body (100) is used to connect with the inner wall of the mounting hole (710). The valve core (200) includes a valve stem (210) and a core cover (220) connected to each other. The valve stem (210) is slidably disposed in the valve hole (110). A pressure relief channel (310) is formed between the valve stem (210) and the inner wall of the valve hole (110). An elastic element (400) has two ends that are in contact with the valve body (100) and the valve core (200), respectively. The core cover (220) is used for a sealing connection with the housing (700) to seal the pressure relief channel (310).

2. The explosion-proof valve according to claim 1, characterized in that, The core cover (220) has a portion that protrudes radially from the outer peripheral wall of the valve body (100), and the end face of the core cover (220) connected to the valve stem (210) is used for sealing cooperation with the housing (700).

3. The explosion-proof valve according to claim 2, characterized in that, The end face of the core cover (220) connected to the valve stem (210) is provided with an annular groove (221) surrounding the valve stem (210), and a sealing ring (500) is provided in the annular groove (221), which is used to seal with the housing (700).

4. The explosion-proof valve according to claim 1, characterized in that, The outer peripheral wall of the valve body (100) is provided with an external thread structure for threaded connection with the mounting hole (710).

5. The explosion-proof valve according to claim 4, characterized in that, An anti-rotation structure is provided between the valve body (100) and the valve core (200), the anti-rotation structure being used to restrict the valve core (200) from rotating around the straight line containing the first direction.

6. The explosion-proof valve according to claim 5, characterized in that, The outer peripheral wall of the valve body (100) is provided with an anti-rotation protrusion (120), the anti-rotation protrusion (120) and the external thread structure are spaced apart along the first direction, the core cover (220) is provided with an anti-rotation groove (222), the anti-rotation protrusion (120) is located in the anti-rotation groove (222), and the anti-rotation structure includes the anti-rotation protrusion (120) and the anti-rotation groove (222).

7. The explosion-proof valve according to claim 6, characterized in that, Along the circumferential direction of the valve body (100), there is a gap between the anti-rotation protrusion (120) and the anti-rotation groove (222).

8. The explosion-proof valve according to claim 4, characterized in that, The core cover (220) has a portion with a polygonal outer profile in cross-section.

9. The explosion-proof valve according to claim 1, characterized in that, The elastic element (400) is sleeved on the outer peripheral wall of the valve stem (210). The two ends of the elastic element (400) are distributed along the first direction. The valve stem (210) has a first abutment portion (2121) at the end away from the core cover (220), and the valve body (100) has a second abutment portion (130) at the end near the core cover (220). The elastic element (400) abuts between the first abutment portion (2121) and the second abutment portion (130).

10. The explosion-proof valve according to claim 9, characterized in that, The valve stem (210) includes a first stem portion (211) and a second stem portion (212) that are detachably connected. The first stem portion (211) is connected to the core cover (220), and the first abutment portion (2121) is provided at the end of the second stem portion (212) opposite to the first stem portion (211).

11. The explosion-proof valve according to claim 1, characterized in that, The core cover (220) is provided with a pressure relief hole (223). The pressure relief hole (223) has a first opening and a second opening. The first opening faces the valve hole (110) and is connected to the valve hole (110). The second opening is located on the outer surface of the core cover (220).

12. The explosion-proof valve according to claim 11, characterized in that, The explosion-proof valve also includes a waterproof and breathable membrane (320), which is disposed on the core cover (220) and covers the second opening; The explosion-proof valve also includes a protective cover (600), which cooperates with the core cover (220) to form a receiving space. The waterproof and breathable membrane (320) is disposed in the receiving space, and a vent is provided between the protective cover (600) and the core cover (220). The vent is used to connect the receiving space with the external environment.

13. A battery pack, characterized in that, The battery pack includes an explosion-proof valve as described in any one of claims 1 to 12, wherein the battery pack includes a housing (700), a first end face (701) of the housing (700) is provided with a mounting hole (710), and the outer peripheral wall of the valve body (100) is connected to the inner wall of the mounting hole (710).

14. The battery pack according to claim 13, characterized in that, A sealing ring (500) is provided between the housing (700) and the core cover (220) to seal the pressure relief channel (310).

15. The battery pack according to claim 13, characterized in that, The core cover (220) has a portion that protrudes radially from the outer peripheral wall of the valve body (100), and the end face of the core cover (220) that connects to the valve stem (210) is in a sealing fit with the first end face (701).

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