Explosion-proof valve, battery pack and vehicle

Abstract

The embodiment of the invention provides an anti-explosion valve, a battery pack and a vehicle. The anti-explosion valve comprises a valve body, a valve rod and a valve rod, wherein the valve body is provided with an axially-through vent hole; the valve element assembly is movably connected to the valve body so that the valve element assembly can be switched between a first position and a second position. The locking assembly is connected between the valve body and the valve element assembly; wherein under the condition that the vent hole has jet airflow, the jet airflow drives the valve element assembly to move to the second position where blocking of the vent hole can be relieved, the locking assembly is used for locking the valve element assembly to the second position, and under the condition that jet airflow of the vent hole is jetted, the valve element assembly is locked to the second position. And the locking assembly unlocks the valve element assembly, so that the valve element assembly is reset to the first position where the vent hole can be blocked. The anti-explosion valve provided by the embodiment of the invention can reduce the maintenance cost and improve the safety.

Description

Technical Field

[0001] The present application belongs to the field of vehicle technology, and specifically relates to an explosion-proof valve, a battery pack and a vehicle. Background Art

[0002] During the use of the battery pack, internal thermal runaway events may cause gas accumulation, resulting in increased internal pressure, and even threatening safety, posing a risk of explosion. Usually, an explosion-proof valve is configured on the battery pack. When gas accumulates inside the battery pack, the explosion-proof valve opens to release the gas inside the battery pack and reduce the pressure inside the battery pack.

[0003] The explosion-proof valve disclosed in the related art cannot be used again after it is opened, which makes the maintenance cost of the explosion-proof valve high and poses a safety hazard. Summary of the invention

[0004] The present application aims to provide an explosion-proof valve, a battery pack and a vehicle to solve the problems of high maintenance costs and potential safety hazards of existing explosion-proof valves.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, the present application discloses an explosion-proof valve, the explosion-proof valve comprising:

[0007] A valve body, wherein the valve body is provided with an axially penetrating vent hole;

[0008] A valve core assembly, the valve core assembly being movably connected to the valve body to switch between a first position and a second position;

[0009] and a locking assembly, wherein the locking assembly is connected between the valve body and the valve core assembly;

[0010] Wherein, when the air vent has a jet of air, the jet of air drives the valve core assembly to move to the second position for unblocking the air vent, and the locking assembly is used to lock the valve core assembly in the second position. When the jet of air from the air vent is completed, the locking assembly releases the lock on the valve core assembly to reset the valve core assembly to the first position for blocking the air vent.

[0011] Optionally, a check groove is provided on the valve core assembly, and the locking assembly includes a holding body and a reset arm connected to the holding body; when the valve core assembly moves to the second position, the holding body is engaged in the check groove to lock the valve core assembly in the second position, and the reset arm is used to release the engagement between the holding body and the check groove to release the lock on the valve core assembly.

[0012] Optionally, the locking assembly includes a locking cover and a locking member;

[0013] The locking cover is fixedly connected to the valve body and encloses the valve body to form a receiving cavity;

[0014] The locking member is movably connected to the valve core assembly, and the locking member is movable in the radial direction of the valve body in the accommodating cavity. The locking member is provided with the holding body on one side close to the valve core assembly, and the holding body is located in the accommodating cavity. The reset arm at least partially extends out of the accommodating cavity.

[0015] Optionally, a mounting groove is provided on a side of the holding body away from the valve core assembly, and a first elastic member is installed in the mounting groove. The first elastic member is used to provide elastic force for the locking member to move radially along the valve body.

[0016] Optionally, the first elastic member is formed by bending a metal wire, and a cross-sectional shape thereof is adapted to a shape of the mounting groove.

[0017] Optionally, the portion of the reset arm extending out of the accommodating cavity is curved.

[0018] Optionally, the locking member includes at least a first locking member and a second locking member, the first locking member and the second locking member are both provided with a clamping body and the reset arm, and the first locking member and the second locking member are connected to two sides of the valve core assembly.

[0019] Optionally, there are multiple reset arms, and the multiple reset arms are arranged at intervals on the holding body.

[0020] Optionally, the valve body is provided with a penetrating center hole, the valve body is provided with a clamping portion at the upper end of the center hole, the locking cover is provided with a buckle at a position corresponding to the clamping portion, and the buckle is connected to the clamping portion to fix the locking cover to the valve body.

[0021] Optionally, the valve core assembly includes a valve cover and a valve column;

[0022] The valve column is inserted into the center hole and connected to the valve cover. The valve cover is arranged on the first end face of the valve body along the axial direction to block the air hole or unblock the air hole. The periphery of the valve column is provided with an annular check groove. The locking piece is connected to the valve column, and the holding body is an annular holding body.

[0023] Optionally, a protective sleeve is fixedly connected to the lower end of the valve body along the axial direction, and the protective sleeve is also sleeved on the periphery of the valve column.

[0024] Optionally, the valve core assembly further includes a second elastic member, which is sleeved on the valve column and located between the protective sleeve and the valve column, and the second elastic member is used to provide elastic force for resetting the valve core assembly to the first position.

[0025] In a second aspect, the present application also discloses a battery pack, comprising: an explosion-proof valve as described in any one of the above items.

[0026] In a third aspect, the present application further discloses a vehicle, comprising: the vehicle described in any one of the above items.

[0027] In the embodiment of the present application, when there is a jet airflow in the battery pack, the locking assembly locks the valve core in the second position, so that the vent hole can be kept open, so that the jet airflow continues to flow to the outside through the vent hole. When the jet airflow is ejected, the locking assembly releases the lock on the valve core assembly, so that the valve core assembly closes the vent hole, and the valve core assembly is reset, so that the explosion-proof valve can be reused, reducing the maintenance cost of the explosion-proof valve. In addition, because the locking assembly can reset the valve core assembly, it can be used to detect the pressure required for the explosion of the explosion-proof valve before leaving the factory, confirming that the explosion-proof valve can be used normally, avoiding the situation where the explosion-proof valve cannot explode and release pressure normally when the battery pack fails due to thermal failure, eliminating safety hazards, and improving the safety of the explosion-proof valve.

[0028] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0030] Figure 1 It is a structural schematic diagram of an explosion-proof valve described in an embodiment of the present application;

[0031] Figure 2 This is a schematic structural diagram of an explosion-proof valve according to an embodiment of the present application from another angle;

[0032] Figure 3 is a cross-sectional view of an explosion-proof valve according to an embodiment of the present application when it is in a second position;

[0033] Figure 4 is a cross-sectional view of an explosion-proof valve according to an embodiment of the present application when it is in a first position;

[0034] Figure 5 It is a structural schematic diagram of a valve core assembly and a locking assembly of an explosion-proof valve shown in an embodiment of the present application;

[0035] Figure 6It is a structural schematic diagram of a valve body and a locking assembly of an explosion-proof valve shown in an embodiment of the present application;

[0036] Figure 7 It is a structural schematic diagram of a valve body and a locking assembly of an explosion-proof valve shown in an embodiment of the present application from another perspective;

[0037] Figure 8 It is a structural schematic diagram of a locking assembly of an explosion-proof valve shown in an embodiment of the present application;

[0038] Fig. 9 It is a structural schematic diagram of a locking member and a first elastic member of an explosion-proof valve shown in an embodiment of the present application;

[0039] Fig.10 It is a structural schematic diagram of a locking member of an explosion-proof valve shown in an embodiment of the present application;

[0040] Fig.11 It is a schematic diagram of the structure of a battery pack shown in an embodiment of the present application.

[0041] Fig.12 is a cross-sectional schematic diagram of a battery pack shown in an embodiment of the present application

[0042] Figure numerals: 1-explosion-proof valve; 10-valve body; 101-vent; 102-center hole; 103-clamping part; 20-valve core assembly; 201-check groove; 202-valve cover; 203-valve column; 30-locking assembly; 301-clamping body; 3011-installation groove; 302-reset arm; 303-locking cover; 3031-buckle; 304-locking member; 3041-first locking member; 3042-second locking member; 305-first elastic member; 40-protective sleeve; 50-second elastic member; 60-protective cover. DETAILED DESCRIPTION

[0043] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0044] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this application, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0045] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0046] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] The embodiment of the present application provides an explosion-proof valve 1, and specifically, the explosion-proof valve 1 is used in a battery pack. In practical applications, the battery pack can be used in a vehicle.

[0048] Reference Figure 1-Figure 10, the embodiment of the present application provides an explosion-proof valve 1, the explosion-proof valve 1 comprises: a valve body 10, the valve body 10 is provided with an axially through-going air vent 101; a valve core assembly 20, the valve core assembly 20 is movably connected to the valve body 10 to switch between a first position and a second position; and a locking assembly 30, the locking assembly 30 is connected between the valve body 10 and the valve core assembly 20; wherein, when the air vent 101 has a jet airflow, the jet airflow drives the valve core assembly 20 to move to the second position that can unblock the air vent 101, the locking assembly 30 is used to lock the valve core assembly 20 in the second position, and when the jet airflow of the air vent 101 is ejected, the locking assembly 30 releases the lock on the valve core assembly 20, so that the valve core assembly 20 is reset to the first position that can block the air vent 101.

[0049] Specifically, the valve body 10 is used to be installed on the housing of the battery pack. For example, the valve body 10 can be installed on the housing of the battery pack. Figure 1 The mounting holes shown are secured to the battery pack by fasteners.

[0050] The valve body 10 has a first end face and a second end face along the axial direction. The second end face is used to connect with the outer surface of the battery pack shell. In order to improve the sealing performance between the valve body 10 and the battery pack shell, a sealing ring can be provided between the second end face and the battery pack shell.

[0051] The valve body 10 is provided with a plurality of axially penetrating vent holes 101. The valve core assembly 20 is arranged on the first side where the first end surface is located, and is movably connected to the valve body 10, and has a first position and a second position. Figure 4 As shown, in the first position, the valve core assembly 20 is attached to the first end surface to block the vent hole 101 on the first side. Figure 3 As shown, in the second position, there is a spacing distance between the valve core assembly 20 and the first end surface, so that the vent hole 101 is in communication with the external environment from the first side.

[0052] According to some embodiments, reference Figure 2 and Figure 6 As shown in , the vent hole 101 can be roughly polygonal, so as to increase the cross-sectional area of ​​the vent hole 101 as much as possible, thereby improving the air permeability rate of the explosion-proof valve 1, and at the same time reducing the weight of the explosion-proof valve 1 and improving the capacity density of the battery pack.

[0053] In the embodiment of the present application, when thermal failure occurs inside the battery pack, a high-pressure jet airflow will be generated inside. When the pressure of the high-pressure jet airflow exceeds the preset pressure of the explosion-proof valve 1, the jet airflow will act on the valve core assembly 20 through the vent 101, driving the valve core assembly 20 to move to the second position. At this time, the locking assembly 30 locks the valve core assembly 20 in the second position, so that the valve core assembly 20 continues to remain in the second position, thereby enabling the valve body 10 to continuously release the pressure inside the shell at a certain rate. When the jet airflow of the vent 101 is ejected, there is no need to release the pressure at this time. The locking assembly 30 is used to release the lock on the valve core assembly 20, so that the valve core assembly 20 is reset to the first position and the vent 101 is re-blocked. In this way, the explosion-proof valve 1 can be reused, reducing the maintenance cost of the explosion-proof valve 1. In addition, the locking assembly 30 can be reset and can be used for factory detection of the pressure required for the explosion-proof valve 1 to explode, confirming that the explosion-proof valve 1 can be used normally, avoiding the situation where the explosion-proof valve 1 cannot explode and release pressure normally when the battery pack fails due to thermal failure, eliminating safety hazards, and improving the safety of the explosion-proof valve 1.

[0054] Optionally, a check groove 201 is provided on the valve core assembly 20, and the locking assembly 30 includes a holding body 301 and a reset arm 302 connected to the holding body 301; when the valve core assembly 20 moves to the second position, the holding body 301 is engaged in the check groove 201 to lock the valve core assembly 20 in the second position, and the reset arm 302 is used to release the engagement between the holding body 301 and the check groove 201 to release the lock on the valve core assembly 20.

[0055] Specifically, the valve core assembly 20 is provided with a check groove 201 distributed along the axial direction on the periphery, and the width, depth, angle, density and other external dimension characteristics of the check groove 201 can be specifically set according to actual product requirements, and the embodiment of the present application does not specifically limit this;

[0056] Specifically, the locking assembly 30 is connected to the valve core assembly 20, the holding body 301 extends radially along the valve body 10, and the non-return groove 201 is recessed on the valve core assembly 20 along the radial direction of the valve body 10. When the valve core assembly 20 moves to the second position under the action of the jet airflow, the holding body 301 is engaged in the non-return groove 201, so that the locking assembly 30 locks the valve core assembly 20 in the second position. In specific applications, through the cooperation of the holding body 301 and the non-return groove 201, the vent 101 can be kept open continuously, so that the high-pressure gas inside the battery pack can be discharged smoothly, effectively reducing the pressure inside the battery pack, thereby ensuring the safety of the battery pack. And the structure is simple and easy to implement.

[0057] Specifically, when the jet flow gradually weakens and eventually stops, the reset arm 302 can release the clamping connection between the clamping body 301 and the check groove 201 through a certain mechanical mechanism or external force, thereby releasing the lock of the valve core assembly 20. Subsequently, the valve core assembly 20 can be reset to the first position under the action of its own gravity or a reset mechanism such as a spring, and the vent hole 101 is resealed. This greatly improves the reusability of the explosion-proof valve 1. Compared with the traditional design of the explosion-proof valve 1, the maintenance cost of the explosion-proof valve 1 is reduced, and the overall safety and reliability of the battery pack are also improved.

[0058] Optionally, the locking assembly 30 includes a locking cover 303 and a locking member 304; the locking cover 303 is fixedly connected to the valve body 10, and is enclosed with the valve body 10 to form an accommodating cavity; the locking member 304 is movably connected to the valve core assembly 20, and the locking member 304 is movable in the radial direction of the valve body 10 in the accommodating cavity, and the locking member 304 is provided with the holding body 301 on the side of the locking member 304 close to the valve core assembly 20, the holding body 301 is located in the accommodating cavity, and the reset arm 302 at least partially extends out of the accommodating cavity.

[0059] Specifically, if Figures 6 to 8 As shown, the locking cover 303 is fixedly connected to the valve body 10 and encloses the valve body 10 to form a receiving cavity, and the locking member 304 is movably connected to the valve core assembly 20 and can freely move in the receiving cavity along the radial direction of the valve body 10. In practical applications, the receiving cavity provides a stable activity space for the locking member 304, preventing the locking member 304 from following the valve core assembly 20 to move axially to the second position, thereby ensuring the stability and reliability of the locking member 304 during operation.

[0060] A clamping body 301 is provided on one side of the locking member 304 close to the valve core assembly 20. The clamping body 301 is located in the accommodating cavity and is used to clamp with the check groove 201 on the valve core assembly 20 when the valve core assembly 20 moves to the second position, thereby realizing the locking function.

[0061] The reset arm 302 at least partially extends out of the accommodating cavity. In practical applications, it is not only convenient to connect and operate the reset arm 302 with an external mechanism, but also enables the reset arm 302 to release the clamping connection between the clamping body 301 and the check groove 201 more quickly when needed, thereby resetting the valve core assembly 20.

[0062] Optionally, a mounting groove 3011 is provided on a side of the holding body 301 away from the valve core assembly 20 , and a first elastic member 305 is installed in the mounting groove 3011 , and the first elastic member 305 is used to provide elastic force for the radial movement of the locking member 304 along the valve body 10 .

[0063] Specifically, if Fig. 9 and Fig.10 As shown, the holding body 301 is provided with a mounting groove 3011, and the mounting groove 3011 is used to install the first elastic member 305. The first elastic member 305 is used to provide elastic force for the locking member 304 to move radially along the valve body 10. In the first position, since the holding body 301 is connected to the valve core assembly 20, the valve core assembly 20 will open the holding body 301, and then the first elastic member 305 installed on the holding body 301 is also opened, storing elastic potential energy. When the jet airflow drives the valve core assembly 20 to move to the second position, the first elastic member 305 drives the locking member 304 to move radially by using the elastic potential energy, thereby causing the holding body 301 to shrink and engage with the check groove 201. In this embodiment, by providing the first elastic member 305, the elastic force of the first elastic member 305 is used to assist in the movement of the locking member 304, thereby improving the response speed and stability of the explosion-proof valve 1.

[0064] Optionally, the first elastic member 305 is formed by bending a metal wire, and a cross-sectional shape thereof is adapted to a shape of the mounting groove 3011 .

[0065] Specifically, the first elastic member 305 is bent into a preset shape by a metal wire, and the preset shape is adapted to the specific shape of the installation groove 3011. Fig. 9 In practical applications, since the metal wire has high elasticity and durability, the elasticity and durability of the first elastic member 305 are improved, and the manufacturing and assembly process thereof is made simpler and more economical.

[0066] The cross-sectional shape of the first elastic member 305 formed by bending the metal wire is adapted to the shape of the mounting groove 3011. The first elastic member 305 can be stably and firmly installed in the mounting groove 3011, and is not easy to loosen or fall off. At the same time, due to the adaptability of the cross-sectional shape, the first elastic member 305 can better exert its elastic effect in the mounting groove 3011, providing a stable and reliable elastic force for the locking member 304 to move along the radial direction of the valve body 10.

[0067] In addition, the first elastic member 305 formed by bending the metal wire also has certain flexibility and plasticity, and can adapt to installation grooves 3011 of different shapes and sizes. This flexibility enables the first elastic member 305 to be more widely used in different types of explosion-proof valves 1, improving its versatility and adaptability.

[0068] Furthermore, the elastic member is provided with a notch. By precisely controlling the shape, size and position of the notch, the first elastic member 305 can produce a more precise and controllable deformation when subjected to an external force, thereby providing a more stable and reliable elastic force for the locking member 304 .

[0069] Optionally, the portion of the reset arm 302 extending out of the accommodating cavity is curved.

[0070] Specifically, refer to Fig.10 The part of the reset arm 302 extending out of the accommodating cavity is set to be curved, and the direction of the curve can be specifically set according to the actual situation. The embodiment of the present application does not make a specific setting for this. The curved reset arm 302 can better adapt to the action of the external mechanism or external force, so that when the lock needs to be released, the external mechanism can more easily contact the reset arm 302 and push it to move. This design reduces the difficulty of operation and improves the response speed of the explosion-proof valve 1.

[0071] Optionally, the locking member 304 includes at least a first locking member 3041 and a second locking member 3042 , and the first locking member 3041 and the second locking member 3042 are both provided with a clamping body 301 and the reset arm 302 , and the first locking member 3041 and the second locking member 3042 are connected to both sides of the valve core assembly 20 .

[0072] Specifically, refer to Fig. 9 and Fig.10 The first locking member 3041 and the second locking member 3042 are connected to the two sides of the valve core assembly 20 along the radial direction of the valve body 10, and can then be clamped with the check groove 201 on the valve core assembly 20 through the clamping body 301 on both sides. In actual applications, since the first locking member 3041 and the second locking member 3042 are respectively located on both sides of the valve core assembly 20, they can be clamped with the check groove 201 on the valve core assembly 20 at the same time, thereby achieving a double locking effect and improving the stability and safety of the explosion-proof valve 1 during high-pressure gas injection.

[0073] In other embodiments, the first locking member 3041 and the second locking member 3042 may also be an integrally formed member, and the locking member may further include three or four locking members, which may be flexibly selected according to specific circumstances.

[0074] Optionally, there are multiple reset arms 302 , and the multiple reset arms 302 are arranged at intervals on the holding body 301 .

[0075] Specifically, a plurality of reset arms 302 are arranged on the holding body 301 at intervals along the circumference of the valve core, and each of the reset arms 302 extends out of the accommodating cavity. In a specific application, through the arrangement of a plurality of reset arms 302, when the lock needs to be released, an external mechanism can choose to push any one or more reset arms 302 to adapt to different operating requirements and conditions. This design enables the explosion-proof valve 1 to respond more flexibly and effectively when dealing with various abnormal situations. In addition, the arrangement of a plurality of reset arms 302 also helps to disperse the force, reducing the risk of a single reset arm 302 being damaged due to excessive force. This design improves the durability and reliability of the reset arm 302.

[0076] Optionally, the valve body 10 is provided with a penetrating center hole 102, and the valve body 10 is provided with a clamping portion 103 at the upper end of the center hole 102, and the locking cover 303 is provided with a buckle 3031 at a position corresponding to the clamping portion 103, and the buckle 3031 is connected to the clamping portion 103 to fix the locking cover 303 to the valve body 10.

[0077] Specifically, if Figure 6-Figure 8 As shown, the center hole 102 on the valve body 10 is used to install and fix the valve core assembly 20, and a clamping portion 103 is provided at the upper end of the center hole 102, and a buckle 3031 is provided at a position corresponding to the clamping portion 103 on the locking cover 303. This buckle 3031 can be clamped with the clamping portion 103 on the valve body 10. When the locking cover 303 is placed on the valve body 10, the buckle 3031 will be clamped into the clamping portion 103, thereby realizing a fixed connection between the locking cover 303 and the valve body 10. The number of the clamping portion 103 and the buckle 3031 is adapted, and can be multiple, so as to further improve the stability of the installation of the locking cover 303 and the valve body 10.

[0078] In practical applications, the connection between the locking cover 303 and the valve body 10 is simpler, faster and more reliable by the buckle 3031 and the clamping portion 103. Compared with the traditional connection method, the connection between the buckle 3031 and the clamping portion 103 does not require additional fasteners or tools, thus greatly simplifying the installation and removal process. At the same time, due to the close fit between the buckle 3031 and the clamping portion 103, this connection method can also provide sufficient stability and strength to ensure that the locking cover 303 is firmly fixed on the valve body 10.

[0079] Optionally, the valve core assembly 20 includes a valve cover 202 and a valve column 203; the valve column 203 is inserted into the center hole 102 and connected to the valve cover 202, the valve cover 202 is arranged on the first end face of the valve body 10 along the axial direction to block the air hole 101 or unblock the air hole 101, the outer periphery of the valve column 203 is provided with an annular check groove 201, the locking member is connected to the valve column 203, and the holding body 301 is an annular holding body 301.

[0080] Specifically, Figures 5 to 10 As shown, the valve column 203 is passed through the center hole 102 and is connected to the valve cover 202. Under the action of the jet airflow, the valve column 203 moves between the first position and the second position along the axial direction of the valve cover 202 in the center hole 102 to drive the valve cover 202 to move between the first position and the second position. The valve cover 202 is arranged on the first end face of the valve body 10 along the axial direction. In the first position, the valve cover 202 is fitted with the first end face to block the vent 101 on the first side. In the second position, there is a spacing distance between the valve cover 202 and the first end face so that the vent 101 is connected to the external environment from the first side.

[0081] The valve column 203 is a cylindrical structure, and the corresponding check groove 201 arranged on the valve column 203 is annular. The locking piece is movably connected to the valve column 203, and the corresponding holding body 301 is annular. The holding body 301 is also annular. In actual application, the annular setting of the check groove 201 and the holding body 301 can make the locking piece more stably and reliably connected to the valve column 203, thereby improving the response speed and stability of the explosion-proof valve 1.

[0082] Optionally, a protective sleeve 40 is fixedly connected to the lower end of the valve body 10 along the axial direction, and the protective sleeve 40 is also sleeved on the periphery of the valve column 203 .

[0083] Specifically, the protective sleeve 40 is a columnar structure, and the protective sleeve 40 with a columnar structure can be sleeved on the periphery of the valve column 203 to prevent foreign matter from entering the interior of the valve column 203, and is used to protect the valve column 203 and guide its movement.

[0084] Optionally, the valve core assembly 20 further includes a second elastic member 50, which is sleeved on the valve column 203 and located between the protective sleeve 40 and the valve column 203, and the second elastic member 50 is used to provide elastic force for resetting the valve core assembly 20 to the first position.

[0085] Specifically, the second elastic member 50 is a spring, which is sleeved on the lower end of the valve column 203 in the axial direction and is located between the valve column 203 and the protective sleeve 40. When the valve column 203 moves to the second position, the second elastic member 50 is used to move on the valve column 203 and be compressed, and has elastic potential energy. When the lock of the valve core assembly 20 is released by the reset arm 302, the valve column 203 can be reset to the first position under the action of the elastic potential energy to re-block the vent 101. On the other hand, the setting of the second elastic member 50 can make the explosion-proof valve 1 have a preset opening pressure to avoid the explosion-proof valve 1 from opening at non-preset pressures, thereby improving the safety of the explosion-proof valve 1.

[0086] Furthermore, the explosion-proof valve 1 may further include a protective cover 60 , and the protective cover 60 is disposed on the valve body 10 and the valve core assembly 20 to protect the valve core assembly 20 .

[0087] It should be noted that, in addition to the above-mentioned components, other components may be provided in the explosion-proof valve described in the embodiment of the present application, which may be selected according to actual conditions, such as Figure 3 and 4 For other components not marked in the figure, the embodiments of the present application are not limited to this.

[0088] In summary, the explosion-proof valve 1 described in the embodiment of the present application may at least include the following advantages:

[0089] In the embodiment of the present application, when thermal failure occurs inside the battery pack, a high-pressure jet airflow will be generated inside. When the pressure of the high-pressure jet airflow exceeds the preset pressure of the explosion-proof valve 1, the jet airflow will act on the valve core assembly 20 through the vent 101, driving the valve core assembly 20 to move to the second position. At this time, the locking assembly 30 locks the valve core assembly 20 in the second position, so that the valve core assembly 20 continues to remain in the second position, thereby enabling the valve body 10 to continuously release the pressure inside the shell at a certain rate. When the jet airflow of the vent 101 is ejected, there is no need to release the pressure at this time. The locking member is used to release the lock on the valve core assembly 20, so that the valve core assembly 20 is reset to the first position and the vent 101 is re-blocked. In this way, the explosion-proof valve 1 can be reused, reducing the maintenance cost of the explosion-proof valve 1. In addition, the locking assembly 30 can be reset and can be used for factory detection of the pressure required for the explosion-proof valve 1 to explode, confirming that the explosion-proof valve 1 can be used normally, avoiding the situation where the explosion-proof valve 1 cannot explode and release pressure normally when the battery pack fails due to thermal failure, eliminating safety hazards, and improving the safety of the explosion-proof valve 1.

[0090] The embodiment of the present application further provides a battery pack, which may specifically include the explosion-proof valve 1 described in any of the above embodiments;

[0091] Specifically, refer to Figure 11-Figure 12The valve body 10 of the explosion-proof valve 1 is fixed at a predetermined position on the battery pack shell by a threaded connection or a snap-on 3031 connection. At this time, the vent hole 101 is connected to the interior of the battery pack shell. A high-temperature resistant sealing ring can be used at the connection between the explosion-proof valve 1 and the battery pack to ensure the sealing effect. The valve core assembly 20 partially extends into the interior of the battery pack. When thermal failure occurs inside the battery pack and a jet airflow is generated, the jet airflow drives the valve core assembly 20 to move, so that the valve core assembly 20 is away from the valve body 10, allowing the jet airflow to flow out, thereby releasing the pressure inside the battery pack and improving the safety of the battery pack.

[0092] It should be noted that in the embodiment of the present application, the structure of the explosion-proof valve is the same as the structure of the explosion-proof valve in any of the above embodiments, and its beneficial effects are also similar, which will not be described in detail here.

[0093] An embodiment of the present application also provides a vehicle, which may specifically include the battery pack described in any of the above embodiments.

[0094] It should be noted that in the embodiment of the present application, the structure of the explosion-proof valve is the same as the structure of the explosion-proof valve in any of the above embodiments, and its beneficial effects are also similar, which will not be described in detail here.

[0095] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0096] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. An explosion-proof valve, characterized in that: The explosion-proof valve comprises: A valve body, wherein the valve body is provided with an axially penetrating vent hole; A valve core assembly, the valve core assembly being movably connected to the valve body to switch between a first position and a second position; and a locking assembly, wherein the locking assembly is connected between the valve body and the valve core assembly; Wherein, when the air vent has a jet of air, the jet of air drives the valve core assembly to move to the second position for unblocking the air vent, and the locking assembly is used to lock the valve core assembly in the second position. When the jet of air from the air vent is completed, the locking assembly releases the lock on the valve core assembly to reset the valve core assembly to the first position for blocking the air vent.

2. The explosion-proof valve according to claim 1, characterized in that: The valve core assembly is provided with a check groove, and the locking assembly includes a holding body and a reset arm connected to the holding body; when the valve core assembly moves to the second position, the holding body is engaged in the check groove to lock the valve core assembly in the second position, and the reset arm is used to release the engagement between the holding body and the check groove to release the lock on the valve core assembly.

3. The explosion-proof valve according to claim 2, characterized in that: The locking assembly comprises a locking cover and a locking member; The locking cover is fixedly connected to the valve body and encloses the valve body to form a receiving cavity; The locking member is movably connected to the valve core assembly, and the locking member is movable in the radial direction of the valve body in the accommodating cavity. The locking member is provided with the holding body on one side close to the valve core assembly, and the holding body is located in the accommodating cavity. The reset arm at least partially extends out of the accommodating cavity.

4. The explosion-proof valve according to claim 3, characterized in that: A mounting groove is provided on a side of the holding body away from the valve core assembly, and a first elastic member is installed in the mounting groove. The first elastic member is used to provide elastic force for the locking member to move along the radial direction of the valve body.

5. The explosion-proof valve according to claim 4, characterized in that: The first elastic member is formed by bending a metal wire, and its cross-sectional shape is adapted to the shape of the mounting groove.

6. The explosion-proof valve according to claim 3, characterized in that: The portion of the reset arm extending out of the accommodating cavity is curved.

7. The explosion-proof valve according to claim 3, characterized in that: The locking member at least includes a first locking member and a second locking member, wherein the first locking member and the second locking member are both provided with a clamping body and the reset arm, and the first locking member and the second locking member are connected to two sides of the valve core assembly.

8. The explosion-proof valve according to any one of claims 2 to 7, characterized in that: There are a plurality of reset arms, and the plurality of reset arms are arranged on the holding body at intervals.

9. The explosion-proof valve according to claim 8, characterized in that: The valve body is provided with a central hole extending therethrough, a clamping portion is provided at the upper end of the central hole, a buckle is provided at a position of the locking cover corresponding to the clamping portion, and the buckle is connected to the clamping portion to fix the locking cover to the valve body.

10. The explosion-proof valve according to claim 9, characterized in that: The valve core assembly includes a valve cover and a valve column; The valve column is inserted into the center hole and connected to the valve cover. The valve cover is arranged on the first end face of the valve body along the axial direction to block the air hole or unblock the air hole. The periphery of the valve column is provided with an annular check groove. The locking piece is connected to the valve column, and the holding body is an annular holding body.

11. The explosion-proof valve according to claim 10, characterized in that: A protective sleeve is fixedly connected to the lower end of the valve body along the axial direction, and the protective sleeve is also sleeved on the periphery of the valve column.

12. The explosion-proof valve according to claim 11, characterized in that: The valve core assembly also includes a second elastic member, which is sleeved on the valve column and located between the protective sleeve and the valve column. The second elastic member is used to provide elastic force for resetting the valve core assembly to the first position.

13. A battery pack, characterized in that: include: The explosion-proof valve according to any one of claims 1 to 12 above.

14. A vehicle, characterized in that: include: The battery pack as claimed in claim 13.

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