Explosion-proof valve, battery pack and electric equipment with battery pack

Abstract

The utility model discloses an explosion-proof valve, a battery pack and electric equipment with the explosion-proof valve, the explosion-proof valve is used for the battery pack and comprises a base, the base is suitable for being arranged on a shell of the battery pack and is provided with a through hole so as to communicate the inside and the outside of the shell; the valve is positioned on one side of the base and is opposite to the through hole; and at least part of the driving assembly is located on the side, away from the valve, of the base and connected with the valve, and the driving assembly is used for driving the valve to move in the direction away from the base and towards the base so as to open or close the through hole. According to the anti-explosion valve, the driving assembly drives the valve body to move in the direction away from the base and towards the base so as to open or close the through hole, active valve opening of the anti-explosion valve can be achieved, passive valve opening in the prior art is avoided, the anti-explosion valve can be opened in time after a battery pack is subjected to thermal runaway, and the safety of the battery pack is improved. The internal heat of the battery pack is quickly led out, heat accumulation during thermal runaway is avoided, the situation of thermal runaway spreading is avoided, and the safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an explosion-proof valve, a battery pack and electrical equipment having the same. Background Art

[0002] With the development of society, the demand for new energy vehicles is increasing, and the safety performance of battery packs is becoming more and more important. In related technologies, when thermal runaway occurs in the battery pack, a large amount of gas will be generated in a short period of time, which may easily cause the battery pack to catch fire or even explode, endangering the safety of passengers. Therefore, it is urgent to develop an explosion-proof valve that can continuously and quickly release pressure. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes an explosion-proof valve, which can realize active valve opening, can open the explosion-proof valve in time, realize the rapid discharge of heat inside the battery pack, avoid heat accumulation during thermal runaway, avoid the spread of thermal runaway, and improve safety.

[0004] The utility model also provides a battery pack, which includes the above-mentioned explosion-proof valve.

[0005] The utility model also provides an electrical device, which includes the above-mentioned battery pack.

[0006] The explosion-proof valve according to the embodiment of the utility model is used for a battery pack and includes: a base, which is suitable for being arranged on the shell of the battery pack and has a through hole to connect the inside and the outside of the shell; a valve, which is located on one side of the base and is arranged opposite to the through hole; and a drive assembly, at least a part of which is located on the side of the base away from the valve and is connected to the valve, and is used to drive the valve to move in a direction away from the base and toward the base to open or close the through hole.

[0007] According to the explosion-proof valve of the embodiment of the utility model, a through hole connecting the inside and the outside of the battery pack shell is provided on the base, the valve is located on one side of the base and arranged opposite to the through hole, at least a part of the drive assembly is located on the side of the base away from the valve and is connected to the valve, and is used to drive the valve to move in a direction away from the base and toward the base to open or close the through hole. The active opening of the explosion-proof valve can be achieved, avoiding the passive opening of the valve in the prior art, and the explosion-proof valve can be opened in time after thermal runaway occurs in the battery pack, so as to realize the rapid extraction of heat from the inside of the battery pack, avoid heat accumulation during thermal runaway, avoid the spread of thermal runaway, and improve safety.

[0008] In addition, the explosion-proof valve according to the utility model may also have the following additional technical features:

[0009] In some embodiments, the driving assembly includes: a coil assembly located on a side of the base away from the valve and fixed relative to the base; a guide rod movably penetrating through the coil assembly in the axial direction of the coil assembly, with one end of the guide rod fixedly connected to the valve; a first magnetic attracting member fixed to an axial end of the guide rod and located within the coil assembly; a second magnetic attracting member fixed to a side of the base away from the valve and sleeved on the guide rod loosely; and an elastic member sleeved on the guide rod and located between the first magnetic attracting member and the second magnetic attracting member for driving the first magnetic attracting member to move in a direction away from the second magnetic attracting member.

[0010] In some embodiments, the explosion-proof valve further includes: a protective shell connected to the base and jointly defining a first installation space with the base, with the coil assembly, the first magnetic attracting member, the second magnetic attracting member, and a part of the guide rod disposed within the first installation space, and an outlet hole for the coil assembly to lead out wires provided on an end face of the protective shell away from the base.

[0011] In some embodiments, a first ventilation hole is provided on the guide rod, the first ventilation hole penetrates through the guide rod along the length direction of the guide rod, and a second ventilation hole is provided on the valve, and the second ventilation hole is communicated with the first ventilation hole.

[0012] In some embodiments, a waterproof and breathable film is provided on a side of the valve away from the base, and the waterproof and breathable film is disposed opposite to the second ventilation hole.

[0013] In some embodiments, a first groove is provided on an end face of the valve away from the base, the second ventilation hole penetrates through the bottom wall of the first groove, and the waterproof and breathable film is spaced apart from the bottom wall of the first groove.

[0014] In some embodiments, a second groove is further provided on an end face of the valve away from the base, the first groove is provided on the bottom wall of the second groove, and the waterproof and breathable film is disposed within the second groove.

[0015] In some embodiments, the explosion-proof valve further includes: a pressing piece fixedly disposed within the second groove, the pressing piece extending in a circumferential direction of the first groove to form a ring shape, and the waterproof and breathable film is located between the pressing piece and the bottom wall of the second groove.

[0016] In some embodiments, a first protrusion is provided on a side of the valve facing away from the base. The first protrusion extends in a ring shape along the edge of the valve. The first protrusion has a first notch. The explosion-proof valve further includes: an upper cover, which is disposed on the side of the valve facing away from the base. A second protrusion is provided on a side of the upper cover facing the valve. The second protrusion extends in a ring shape along the edge of the upper cover. The second protrusion is located outside the first protrusion and cooperates with the outer peripheral wall of the first protrusion. The upper cover and the valve jointly define a second installation space. The second protrusion has a second notch, and the second notch is disposed opposite to the first notch.

[0017] In some embodiments, the first notches are multiple and are spaced at intervals in the circumferential direction of the first protrusion, and the second notches are multiple and correspond to the multiple first notches one by one.

[0018] In some embodiments, the guide rod is threadedly connected to the valve; and / or, the guide rod is threadedly connected to the first magnetic attraction member.

[0019] In some embodiments, the base and the housing are connected by fasteners; or, the base and the housing are threadedly connected.

[0020] In some embodiments, a first sealing groove is provided on an end face of the base facing away from the valve. The first sealing groove surrounds the driving assembly. A first sealing ring is provided in the first sealing groove, and the first sealing ring is adapted to abut against the housing.

[0021] In some embodiments, a second sealing ring is provided between the base and the valve. The second sealing ring surrounds the through hole. A second sealing groove for accommodating the second sealing ring is provided on an end face of the base facing the valve.

[0022] The present utility model also provides a battery pack having the above embodiments.

[0023] According to the battery pack of the embodiments of the present utility model, by providing the above explosion-proof valve, with a through hole provided on the base for communicating the inside and outside of the battery pack housing, the valve is located on one side of the base and is disposed opposite to the through hole, and at least a part of the driving assembly is located on the side of the base facing away from the valve and is connected to the valve, and is used to drive the valve to move in a direction away from the base and towards the base to open or close the through hole, the active opening of the explosion-proof valve can be realized, avoiding the passive opening in the prior art, and being able to open the explosion-proof valve in time after the battery pack has a thermal runaway, realizing the rapid export of the heat inside the battery pack, avoiding the heat accumulation during the thermal runaway, avoiding the spread of the thermal runaway, and improving the safety.

[0024] The present utility model also provides an electrical device having the above embodiments.

[0025] According to the electrical equipment of the embodiment of the utility model, the above-mentioned battery pack is provided, and a through hole connecting the inside and the outside of the battery pack shell is provided on the base. The valve is located on one side of the base and arranged opposite to the through hole. At least a part of the drive assembly is located on the side of the base away from the valve and is connected to the valve, and is used to drive the valve to move in a direction away from the base and toward the base to open or close the through hole. The active opening of the explosion-proof valve can be achieved, avoiding the passive opening of the valve in the prior art, and the explosion-proof valve can be opened in time after thermal runaway occurs in the battery pack, so as to realize the rapid extraction of heat from the battery pack, avoid heat accumulation during thermal runaway, avoid the spread of thermal runaway, and improve safety.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0028] Figure 1 This is an exploded view of the explosion-proof valve according to the first angle of the embodiment of the utility model;

[0029] Figure 2 is an exploded view of the explosion-proof valve according to the embodiment of the utility model from a second angle;

[0030] Figure 3 is an exploded view of the explosion-proof valve according to the embodiment of the utility model from a third angle;

[0031] Figure 4 is an exploded cross-sectional view of an explosion-proof valve according to an embodiment of the utility model;

[0032] Figure 5 is a front view of an explosion-proof valve according to an embodiment of the utility model, wherein the valve closes the through hole;

[0033] Figure 6 is a cross-sectional view of an explosion-proof valve according to an embodiment of the utility model, wherein the valve closes the through hole;

[0034] Figure 7 is a front view of an explosion-proof valve according to an embodiment of the utility model, wherein the valve opens the through hole;

[0035] Figure 8 It is a cross-sectional view of an explosion-proof valve according to an embodiment of the utility model, wherein the valve opens a through hole.

[0036] Reference numerals:

[0037] 100, explosion-proof valve;

[0038] 1. Base; 11. Through hole; 12. First sealing groove; 13. First sealing ring; 14. Second sealing ring; 15. Second sealing groove; 16. Mounting hole;

[0039] 2. Valve; 21. Second ventilation hole; 22. Waterproof and breathable membrane; 23. First groove; 24. Second groove; 25. First protrusion; 251. First notch;

[0040] 3. Driving component; 31. Coil component; 311. Coil base; 312. Coil; 313. Lead wire; 32. Guide rod; 321. First ventilation hole; 33. First magnetic part; 34. Second magnetic part; 35. Elastic part;

[0041] 4. Protective shell; 41. Wire outlet hole; 42. Third ventilation hole;

[0042] 5. Pressing piece;

[0043] 6. Upper cover; 61. Second protrusion; 611. Second notch. Detailed implementation manners

[0044] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0045] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0046] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality" means two or more unless otherwise specifically defined.

[0047] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] The explosion-proof valve 100 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0049] like Figure 1 , Figure 2 and Figure 3 As shown, the explosion-proof valve 100 according to an embodiment of the present invention is used for a battery pack and includes a base 1, a valve 2 and a drive assembly 3.

[0050] Specifically, refer to the attached Figure 1 and attached Figure 2 As shown, the base 1 is suitable for being arranged on the shell of the battery pack and has a through hole 11 to connect the inside and outside of the shell. Specifically, when the base 1 is installed on the shell of the battery pack, one axial end of the through hole 11 is opposite to and connected to the exhaust hole on the shell, and the other axial end is connected to the external environment. When the through hole 11 is opened, the gas in the shell can flow to the external environment through the exhaust hole and the through hole 11 in sequence. When the through hole 11 is closed, the battery pack forms a closed space. Further, refer to the attached Figure 2 and attached Figure 4 As shown, the valve 2 is located on one side of the base 1 and is arranged opposite to the through hole 11, and at least a part of the drive assembly 3 is located on the side of the base 1 away from the valve 2 and is connected to the valve 2, for driving the valve 2 to move in a direction away from the base 1 and toward the base 1 to open or close the through hole 11.

[0051] It is understandable that when the air pressure sensor in the battery pack detects a sharp increase in the air pressure in the battery pack, or when the BMS (battery management system) detects thermal runaway inside the battery pack, the BMS sends a thermal runaway signal, and the drive component 3 drives the valve 2 to move away from the base 1, opening the through hole 11, connecting the inside and outside of the shell, so that the high-temperature and high-pressure gas inside the battery pack is discharged from the through hole 11, until the high-temperature and high-pressure gas in the battery pack is completely discharged or meets the emission requirements, the BMS sends a pressure relief signal, and the drive component 3 drives the valve 2 to move toward the base 1 and close the through hole 11. Among them, BMS refers to the battery management system, which is a mature technology, so it is not described in detail. The explosion-proof valve 100 can cooperate with the BMS thermal runaway detection to achieve the fastest response and avoid heat accumulation.

[0052] It can be understood that the utility model can realize active opening of the explosion-proof valve 100 by driving the valve 2 to open the through hole 11 through the driving component 3, avoiding the passive valve opening in the prior art (waiting until the pressure in the battery pack accumulates to a certain level before the valve is opened), and can open the explosion-proof valve 100 in time after thermal runaway occurs in the battery pack, so as to realize rapid heat extraction inside the battery pack, avoid heat accumulation during thermal runaway, avoid the spread of thermal runaway, and improve safety. In addition, the valve 2 can be reset under the drive of the driving component 3 to close the through hole 11, so as to realize the sustainable use of the explosion-proof valve 100, extend the service life of the explosion-proof valve 100, and reduce the maintenance and replacement frequency of the explosion-proof valve 100.

[0053] It should be noted that the reference Figure 6 and attached Figure 8 As shown, at least part of the drive assembly 3 is located on the side of the base 1 away from the valve 2 , which can facilitate the electrical connection between the drive assembly 3 and the BMS and reduce the difficulty of the BMS sending signals to the drive assembly 3 .

[0054] According to the explosion-proof valve 100 of the embodiment of the utility model, a through hole 11 connecting the inside and the outside of the battery pack shell is provided on the base 1, the valve 2 is located on one side of the base 1 and is arranged opposite to the through hole 11, and at least a part of the driving component 3 is located on the side of the base 1 away from the valve 2 and is connected to the valve 2, and is used to drive the valve 2 to move in a direction away from the base 1 and toward the base 1 to open or close the through hole 11. The active opening of the explosion-proof valve 100 can be achieved, avoiding the passive opening of the valve in the prior art, and the explosion-proof valve 100 can be opened in time after thermal runaway occurs in the battery pack, so as to realize the rapid extraction of heat from the inside of the battery pack, avoid heat accumulation during thermal runaway, avoid the spread of thermal runaway, and improve safety.

[0055] In some embodiments of the present invention, refer to the attached Figure 1 , Attachment Figure 3 and attached Figure 4 As shown, the driving assembly 3 includes a coil assembly 31, a guide rod 32, a first magnetic member 33, a second magnetic member 34 and an elastic member 35. The coil assembly 31 is located on the side of the base 1 away from the valve 2 and is fixed relative to the base 1. Specifically, the coil assembly 31 includes a coil base 311 and a coil 312. The coil base 311 is arranged along the axial direction of the base 1 (see attached Figure 4 The coil 312 is wound around the coil base 311.

[0056] Further, see Attachment Figure 6 and attached Figure 8 As shown, the guide rod 32 is arranged along the axial direction of the coil assembly 31 (see the attached Figure 6The a direction shown) is movably disposed within the coil base 311 of the coil assembly 31. One end of the guide rod 32 is fixedly connected to the valve 2. The first magnetic member 33 is fixed to one axial end of the guide rod 32 and is located within the coil base 311 of the coil assembly 31. The first magnetic member 33 is connected to the end of the guide rod 32 facing away from the valve 2. The second magnetic member 34 is fixed to the side of the base 1 facing away from the valve 2 and is sleeved on the guide rod 32. The elastic member 35 is sleeved on the guide rod 32 and is located between the first magnetic member 33 and the second magnetic member 34. The two ends of the elastic member 35 in the length direction (refer to the attached Figure 6 shown a direction) respectively abut against the first magnetic member 33 and the second magnetic member 34, and are used to drive the first magnetic member 33 to move in a direction away from the second magnetic member 34, which can drive the guide rod 32 to move, and further drive the valve 2 to move towards the direction close to the base 1, ensuring the seal between the valve 2 and the base 1 and ensuring the effectiveness of the explosion-proof valve 100.

[0057] For example, when the battery pack is applied to a vehicle, during the driving of the vehicle, the explosion-proof valve 100 may open abnormally due to mechanical vibration and other reasons. The setting of the elastic member 35 can prevent the seal between the valve 2 and the base 1 from failing and ensure the sealing reliability of the explosion-proof valve 100. It should be noted that when the battery pack is in a normal state, the elastic member 35 is in a compressed state.

[0058] It can be understood that the driving assembly 3 forms an electromagnet structure. When the coil 312 is energized, refer to the attached Figure 8 shown, the coil assembly 31 generates a magnetic field, causing the first magnetic member 33 and the second magnetic member 34 to attract each other. Since the second magnetic member 34 is fixed to the side of the base 1 facing away from the valve 2, the first magnetic member 33 moves towards the direction close to the second magnetic member 34, compressing the elastic member 35. Since the first magnetic member 33 is connected to the guide rod 32, the first magnetic member 33 drives the guide rod 32 to move together. Since one end of the guide rod 32 facing away from the first magnetic member 33 is fixedly connected to the valve 2, the valve 2 is driven to move away from the base 1 to open the through hole 11; after the coil 312 is powered off, refer to the attached Figure 6 shown, the coil assembly 31 loses its magnetism, and the elastic member 35 drives the first magnetic member 33 to move in a direction away from the second magnetic member 34, and then drives the guide rod 32 to move together, realizing that the guide rod 32 drives the valve 2 to move towards the direction close to the base 1 to close the through hole 11. It should be noted that when the coil 312 is energized, the first magnetic member 33 overcomes the compression force of the elastic member 35 and can always maintain the opening of the valve 2 of the explosion-proof valve 100 at the maximum, ensuring the exhaust rate of the explosion-proof valve 100.

[0059] Optionally, the second magnetic component 34 and the base 1 can be connected by adhesive, which has a simple process, low cost, good sealing and chemical stability, and can ensure the connection between the second magnetic component 34 and the base 1; the second magnetic component 34 and the base 1 can also be connected by welding, which can improve the stability and reliability of the connection between the second magnetic component 34 and the base 1 and improve the sealing performance; the end face of the base 1 facing the second magnetic component 34 has a first sinker, the second magnetic component 34 is arranged in the first sinker, and the outer peripheral wall of the second magnetic component 34 is interference fit with the inner peripheral wall of the first sinker, with a simple structure, good centering, strong bearing capacity, good impact resistance, and can improve the assembly efficiency of the explosion-proof valve 100.

[0060] In a further embodiment of the present invention, refer to the attached Figure 6 and attached Figure 8 As shown, combined with reference Figure 5 and Figure 7 The explosion-proof valve 100 also includes a protective shell 4, which is connected to the base 1 and defines a first installation space together with the base 1. Parts of the coil assembly 31, the first magnetic member 33, the second magnetic member 34 and the guide rod 32 are arranged in the first installation space. The protective shell 4 can protect and fix the coil assembly 31, the first magnetic member 33, the second magnetic member 34 and the guide rod 32 to prevent the coil assembly 31, the first magnetic member 33, the second magnetic member 34 and the guide rod 32 from colliding with the components inside the battery pack, thereby protecting the safety and stability of the explosion-proof valve 100.

[0061] Further, see Attachment Figure 1 As shown, the protective shell 4 has a wire outlet hole 41 for the coil assembly 31 to be used for outlet wires on the end surface facing away from the base 1. The lead wire 313 of the coil 312 can pass through the wire outlet hole 41 and be connected to the BMS system in the battery pack.

[0062] Optionally, the protective shell 4 and the base 1 can be connected by adhesive, which has a simple process, low cost, good sealing and chemical stability, and can ensure the connection between the protective shell 4 and the base 1; the protective shell 4 and the base 1 can also be connected by welding, which can improve the stability and reliability of the connection between the protective shell 4 and the base 1 and enhance the sealing performance; the end face of the base 1 facing the protective shell 4 has a second sinker, the protective shell 4 is arranged in the second sinker, and the outer peripheral wall of the protective shell 4 and the inner peripheral wall of the second sinker are interference fit, with a simple structure, good centering, strong bearing capacity, good impact resistance, and can improve the assembly efficiency of the explosion-proof valve 100.

[0063] In a further embodiment of the present invention, refer to the attached Figure 6 and attached Figure 8 As shown, the guide rod 32 has a first vent hole 321, and the first vent hole 321 is along the length direction of the guide rod 32 (see the attached Figure 6The a direction shown) passes through the guide rod 32. The valve 2 is provided with a second ventilation hole 21, and the second ventilation hole 21 communicates with the first ventilation hole 321. It can be understood that when the battery pack is in a normal state, due to changes in temperature and altitude inside the battery pack, there is a pressure difference between the inside and outside of the battery pack, and gas exchange is required. The settings of the first ventilation hole 321 and the second ventilation hole 21 can play the role of a ventilation channel, enabling the gas inside and outside the battery pack to be exchanged through the explosion-proof valve 100, improving the safety of the battery pack. It should be noted that the third ventilation hole 42 is provided on the end face of the protective case 4 facing away from the base 1, and the third ventilation hole 42 is opposite to and communicates with the first ventilation hole 321. The gas inside the battery pack can enter the first ventilation hole 321 through the third ventilation hole 42.

[0064] In a further embodiment of the present utility model, referring to the attached Figure 1 and the attached Figure 2 As shown, a waterproof and breathable film 22 is provided on the side of the valve 2 facing away from the base 1. The waterproof and breathable film 22 is disposed opposite to the second ventilation hole 21. With a simple structure and low cost, it is possible to achieve the exchange and balance of the air pressure inside and outside the battery pack through the waterproof and breathable film 22 without opening the explosion-proof valve 100, avoiding the risk of water ingress and failure when the explosion-proof valve 100 is opened. Preferably, the waterproof and breathable film 22 is an expanded polytetrafluoroethylene (E-PTFE) part. Expanded polytetrafluoroethylene is a porous, low-density and highly tough material made from polytetrafluoroethylene (PTFE) resin through a special processing technology, which can ensure the waterproof and breathable functions of the waterproof and breathable film 22.

[0065] In a further embodiment of the present utility model, referring to the attached Figure 2 As shown, a first groove 23 is provided on the end face of the valve 2 facing away from the base 1. The second ventilation hole 21 penetrates the bottom wall of the first groove 23. The waterproof and breathable film 22 is spaced apart from the bottom wall of the first groove 23, so that after the air flow inside the battery pack flows out from the second ventilation hole 21, it first enters the space defined by the first groove 23 and the waterproof and breathable film 22, and then flows to the outside of the battery pack through the waterproof and breathable film 22, which can increase the breathable area of the waterproof and breathable film 22, improve the breathable effect of the waterproof and breathable film 22, and improve the exhaust rate of the explosion-proof valve 100.

[0066] In a further embodiment of the present utility model, referring to the attached Figure 2As shown, a second groove 24 is further provided on the end face of the valve 2 facing away from the base 1. The first groove 23 is provided on the bottom wall of the second groove 24. The waterproof and breathable membrane 22 is provided in the second groove 24. The setting of the second groove 24 can position the waterproof and breathable membrane 22, preventing the waterproof and breathable membrane 22 from shifting in the direction perpendicular to the axis of the base 1, ensuring that the waterproof and breathable membrane 22 is opposite to the second ventilation hole 21 and the first groove 23, further improving the ventilation effect of the waterproof and breathable membrane 22 and increasing the exhaust rate of the explosion-proof valve 100.

[0067] In a further embodiment of the present utility model, referring to the attached Figure 2 As shown, the explosion-proof valve 100 further includes a pressing piece 5. The pressing piece 5 is fixedly provided in the second groove 24. The pressing piece 5 extends circumferentially along the first groove 23 into a ring shape. The waterproof and breathable membrane 22 is located between the pressing piece 5 and the bottom wall of the second groove 24. The setting of the pressing piece 5 can fix the waterproof and breathable membrane 22 to the bottom wall of the second groove 24, preventing the waterproof and breathable membrane 22 from coming out of the second groove 24, ensuring the ventilation effect of the waterproof and breathable membrane 22 and increasing the exhaust rate of the explosion-proof valve 100. It should be noted that the outer peripheral wall of the pressing piece 5 is in interference fit with the inner peripheral wall of the second groove 24, which can ensure the reliability of the fixation of the pressing piece 5, and thus ensure the fixing effect of the pressing piece 5 on the waterproof and breathable membrane 22.

[0068] In a further embodiment of the present utility model, in combination with referring to the attached Figure 1 and the attached Figure 2 , a first protrusion 25 is provided on the side of the valve 2 facing away from the base 1. The first protrusion 25 extends circumferentially along the edge of the valve 2 into a ring shape. The explosion-proof valve 100 further includes an upper cover 6. The upper cover 6 is covered on the side of the valve 2 facing away from the base 1. The setting of the upper cover 6 can protect the waterproof and breathable membrane 22. A second protrusion 61 is provided on the side of the upper cover 6 facing the valve 2. The second protrusion 61 extends circumferentially along the edge of the upper cover 6 into a ring shape. The second protrusion 61 is located outside the first protrusion 25 and cooperates with the outer peripheral wall of the first protrusion 25. The upper cover 6 and the valve 2 jointly define a second installation space. Through the cooperation of the first protrusion 25 and the second protrusion 61, it is possible to prevent the upper cover 6 from being misaligned or having a step during assembly, ensuring the accuracy and stability of the assembly of the upper cover 6 and the valve 2, and can also prevent dust or other impurities from entering the interior of the second installation space to a certain extent. Preferably, the outer peripheral wall of the first protrusion 25 is in interference fit with the inner peripheral wall of the second protrusion 61, which can ensure the reliability of the assembly of the upper cover 6, and thus ensure the protection effect of the upper cover 6 on the waterproof and breathable membrane 22.

[0069] Further, in combination with referring to the attached Figure 1 and the attached Figure 2As shown, the first protrusion 25 has a first notch 251, and the second protrusion 61 has a second notch 611. The second notch 611 is disposed opposite to the first notch 251. The airflow entering the second installation space through the second ventilation hole 21 can flow out of the explosion-proof valve 100 through the gap between the first notch 251 and the second notch 611, enabling the gas inside and outside the battery pack to be exchanged through the explosion-proof valve 100 and improving the safety of the battery pack.

[0070] In a specific example, as Figure 4 shown, the airflow inside the battery pack first enters the first installation space through the third ventilation hole 42 on the protective case 4, then sequentially passes through the first ventilation hole 321 and the second ventilation hole 21, enters the second installation space, and after passing through the waterproof and breathable membrane 22, flows out of the explosion-proof valve 100 through the gap between the first notch 251 and the second notch 611.

[0071] In a further embodiment of the present utility model, referring to the attached Figure 1 and the attached Figure 2 shown, the first notch 251 is a plurality of notches spaced along the circumferential direction of the first protrusion 25, and the second notch 611 is a plurality of notches corresponding one-to-one to the plurality of first notches 251. A plurality of ventilation channels can be provided in the circumferential direction of the valve 2, expanding the cross-sectional area of the ventilation channels, increasing the flow rate of the airflow in the second installation space, improving the efficiency of gas exchange between the inside and outside of the battery pack, and further enhancing the safety of the battery pack.

[0072] In a specific example, referring to the attached Figure 1 and the attached Figure 2 shown, the first notch 251 is four notches spaced along the circumferential direction of the first protrusion 25, and the second notch 611 is four notches corresponding one-to-one to the four first notches 251. Four ventilation channels can be provided in the circumferential direction of the valve 2, further expanding the cross-sectional area of the ventilation channels, increasing the flow rate of the airflow in the second installation space, improving the efficiency of gas exchange between the inside and outside of the battery pack, and further enhancing the safety of the battery pack.

[0073] In a further embodiment of the present utility model, referring to the attached Figure 1 and the attached Figure 2 shown, the guide rod 32 is threadedly connected to the valve 2. Among them, the guide rod 32 has an external thread, and the second ventilation hole 21 of the valve 2 has an internal thread. Through the rotational cooperation of the internal thread and the external thread, by using the friction force, tension, and the action of the thread slope, the fastening and fixing effects are achieved, ensuring the connection between the guide rod 32 and the valve 2, realizing the detachable connection between the guide rod 32 and the valve 2, reducing the assembly difficulty and disassembly difficulty between the guide rod 32 and the valve 2, and improving the flexibility, sealing performance, and load-bearing capacity of the connection between the guide rod 32 and the valve 2.

[0074] Furthermore, referring to the attachedFigure 1 and the attached Figure 2 As shown, the guide rod 32 is threadedly connected to the first magnetic member 33. Among them, the guide rod 32 has an external thread, and the first magnetic member 33 has an internal thread. Through the rotational cooperation of the internal thread and the external thread, by using the functions of friction, tension, and the thread inclined plane, the fastening and fixing effects are achieved, ensuring the connection between the guide rod 32 and the first magnetic member 33, realizing the detachable connection between the guide rod 32 and the first magnetic member 33, reducing the assembly difficulty and disassembly difficulty between the guide rod 32 and the first magnetic member 33, and improving the flexibility, sealing performance, and load-bearing capacity of the connection between the guide rod 32 and the first magnetic member 33.

[0075] In some embodiments of the present utility model, referring to the attached Figure 1 As shown, the base 1 and the housing are connected by fasteners. The structure is simple, which is convenient to fix the base 1 on the housing or disassemble it from the housing, can reduce the disassembly and assembly difficulty of the explosion-proof valve 100, and at the same time can ensure the reliability of the connection between the base 1 and the housing, and improve the stability of the connection between the explosion-proof valve 100 and the housing. Further, there can be multiple fasteners, and the multiple fasteners are arranged at intervals along the circumferential direction of the base 1. Each fastener is used to connect the base 1 and the housing, which can improve the reliability of the connection between the base 1 and the housing and further ensure the stability of the connection between the explosion-proof valve 100 and the housing.

[0076] In a specific example, referring to the attached Figure 1 As shown, the fasteners are bolts. Four mounting holes 16 are provided on the base 1, and the four mounting holes 16 are arranged at intervals along the circumferential direction of the base 1. Each mounting hole 16 has an internal thread, and the four bolts respectively correspond to the four mounting holes 16 one by one, which can enable each bolt to pass through the housing and the mounting hole 16 and be fixed on the base 1, or enable each bolt to pass through the mounting hole 16 and the housing and be fixed on the housing.

[0077] In some other embodiments of the present utility model, the base 1 is threadedly connected to the housing. One of the base 1 and the housing has an external thread, and the other has an internal thread. Through the rotational cooperation of the internal thread and the external thread, by using the functions of friction, tension, and the thread inclined plane, the fastening and fixing effects are achieved, ensuring the connection between the base 1 and the housing, realizing the detachable connection between the base 1 and the housing, reducing the assembly difficulty and disassembly difficulty between the base 1 and the housing, and improving the flexibility, sealing performance, and load-bearing capacity of the connection between the guide rod 32 and the first magnetic member 33.

[0078] In some embodiments of the present utility model, referring to the attached Figure 1As shown, the end face of the base 1 facing away from the valve 2 is provided with a first sealing groove 12, the first sealing groove 12 is arranged around the driving assembly 3, a first sealing ring 13 is arranged in the first sealing groove 12, the first sealing ring 13 is suitable for abutting against the shell, and the first sealing groove 12 can play a positioning role for the first sealing ring 13, prevent the first sealing ring 13 from moving in a direction perpendicular to the axis of the base 1, ensure the sealing effect of the first sealing ring 13, ensure the sealing performance between the base 1 and the shell, prevent the airflow in the battery pack from flowing out from the gap between the base 1 and the shell, and ensure that the gas in the battery pack flows out from the through hole 11. It should be noted that the base 1 and the shell are connected by bolts, and the tightening force of the bolts can make the base 1 fit with the shell, which can further compress the first sealing ring 13 and improve the sealing effect between the base 1 and the shell.

[0079] In some embodiments of the present invention, refer to the attached Figure 2 As shown, a second sealing ring 14 is provided between the base 1 and the valve 2, and the second sealing ring 14 is arranged around the through hole 11. A second sealing groove 15 for accommodating the second sealing ring 14 is provided on one end surface of the base 1 facing the valve 2. The second sealing groove 15 can play a positioning role for the second sealing ring 14, and prevent the second sealing ring 14 from moving in a direction perpendicular to the axis of the base 1, thereby ensuring the sealing effect of the second sealing ring 14, ensuring the sealing performance between the base 1 and the valve 2, and preventing the airflow in the battery pack from flowing out from the gap between the base 1 and the valve 2, thereby avoiding affecting the blocking effect of the valve 2 on the through hole 11.

[0080] The present invention also provides a battery pack having the explosion-proof valve 100 of the above embodiment.

[0081] According to the battery pack of the embodiment of the utility model, the above-mentioned explosion-proof valve 100 is provided, and a through hole 11 connecting the inside and the outside of the battery pack shell is provided on the base 1. The valve 2 is located on one side of the base 1 and is arranged opposite to the through hole 11. At least a part of the drive component 3 is located on the side of the base 1 away from the valve 2 and is connected to the valve 2, and is used to drive the valve 2 to move in a direction away from the base 1 and toward the base 1 to open or close the through hole 11. The active opening of the explosion-proof valve 100 can be achieved, avoiding the passive opening of the valve in the prior art, and the explosion-proof valve 100 can be opened in time after thermal runaway occurs in the battery pack, so as to realize the rapid extraction of heat from the inside of the battery pack, avoid heat accumulation during thermal runaway, avoid the spread of thermal runaway, and improve safety.

[0082] The utility model also provides an electrical device having the battery pack of the above embodiment.

[0083] Optionally, the electrical equipment may be a vehicle, an aircraft, an energy storage device, a computer, etc. By applying the battery pack of the above-mentioned embodiments to electrical equipment such as a vehicle, an aircraft, an energy storage device, a computer, etc., the safety performance of the vehicle, aircraft, energy storage device, computer, etc. can be improved, the safety of the user can be guaranteed, and the user experience can be improved.

[0084] According to the electrical equipment of the embodiment of the utility model, the above-mentioned battery pack is provided, and a through hole 11 connecting the inside and the outside of the battery pack shell is provided on the base 1. The valve 2 is located on one side of the base 1 and is arranged opposite to the through hole 11. At least part of the driving component 3 is located on the side of the base 1 away from the valve 2 and is connected to the valve 2, and is used to drive the valve 2 to move in a direction away from the base 1 and toward the base 1 to open or close the through hole 11. The active opening of the explosion-proof valve 100 can be achieved, avoiding the passive opening of the valve in the prior art, and the explosion-proof valve 100 can be opened in time after thermal runaway occurs in the battery pack, so as to realize the rapid extraction of heat from the battery pack, avoid heat accumulation during thermal runaway, avoid the spread of thermal runaway, and improve safety.

[0085] The explosion-proof valve 100, the battery pack and other structures and operations of the electrical equipment according to the embodiment of the utility model are known to ordinary technicians in the field and will not be described in detail here.

[0086] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. 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 utility model. In this specification, the schematic representations of the above terms do 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. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0087] Although the embodiments of the present invention 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 invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An explosion-proof valve, characterized in that: For battery packs and including: A base (1), the base (1) being suitable for being arranged on a shell of the battery pack and having a through hole (11) for connecting the inside and the outside of the shell; a valve (2), the valve (2) being located on one side of the base (1) and arranged opposite to the through hole (11); A drive assembly (3), at least part of which is located on a side of the base (1) away from the valve (2) and connected to the valve (2), and is used to drive the valve (2) to move in a direction away from the base (1) and towards the base (1) to open or close the through hole (11).

2. The explosion-proof valve according to claim 1, characterized in that: The driving assembly (3) comprises: a coil assembly (31), the coil assembly (31) being located on a side of the base (1) facing away from the valve (2) and being fixed relative to the base (1); A guide rod (32), the guide rod (32) being movably arranged in the coil assembly (31) along the axial direction of the coil assembly (31), and one end of the guide rod (32) being fixedly connected to the valve (2); A first magnetic attraction member (33), the first magnetic attraction member (33) being fixed to one axial end of the guide rod (32) and being located inside the coil assembly (31); A second magnetic attraction member (34), the second magnetic attraction member (34) being fixed to a side of the base (1) facing away from the valve (2) and being loosely sleeved on the guide rod (32); An elastic member (35), wherein the elastic member (35) is sleeved on the guide rod (32) and is located between the first magnetic member (33) and the second magnetic member (34), and is used for driving the first magnetic member (33) to move in a direction away from the second magnetic member (34).

3. The explosion-proof valve according to claim 2, characterized in that: The explosion-proof valve (100) further comprises: A protective shell (4), the protective shell (4) being connected to the base (1) and defining a first installation space together with the base (1), the coil assembly (31), the first magnetic attraction member (33), the second magnetic attraction member (34) and part of the guide rod (32) being arranged in the first installation space, and a wire outlet hole (41) for outlet wires of the coil assembly (31) being provided on an end face of the protective shell (4) facing away from the base (1).

4. The explosion-proof valve according to claim 2, characterized in that: The guide rod (32) is provided with a first vent hole (321), the first vent hole (321) penetrating the guide rod (32) along the length direction of the guide rod (32), and the valve (2) is provided with a second vent hole (21), the second vent hole (21) being in communication with the first vent hole (321).

5. The explosion-proof valve according to claim 4, characterized in that: A waterproof and breathable membrane (22) is provided on the side of the valve (2) facing away from the base (1), and the waterproof and breathable membrane (22) is arranged opposite to the second vent hole (21).

6. The explosion-proof valve according to claim 5, characterized in that: A first groove (23) is provided on the end surface of the valve (2) facing away from the base (1), the second vent hole (21) penetrates the bottom wall of the first groove (23), and the waterproof breathable membrane (22) is spaced apart from the bottom wall of the first groove (23).

7. The explosion-proof valve according to claim 6, characterized in that: A second groove (24) is also provided on the end surface of the valve (2) facing away from the base (1); the first groove (23) is provided on the bottom wall of the second groove (24); and the waterproof breathable membrane (22) is provided in the second groove (24).

8. The explosion-proof valve according to claim 7, characterized in that: The explosion-proof valve (100) further comprises: A pressing sheet (5), the pressing sheet (5) is fixedly arranged in the second groove (24), the pressing sheet (5) extends in a ring shape along the circumferential direction of the first groove (23), and the waterproof breathable membrane (22) is located between the pressing sheet (5) and the bottom wall of the second groove (24).

9. The explosion-proof valve according to claim 4, characterized in that: A first protrusion (25) is provided on a side of the valve (2) facing away from the base (1), the first protrusion (25) extending in a ring shape along the edge of the valve (2), the first protrusion (25) having a first notch (251), and the explosion-proof valve (100) further comprising: An upper cover (6), the upper cover (6) being arranged on a side of the valve (2) facing away from the base (1), the upper cover (6) being provided with a second protrusion (61) on a side facing the valve (2), the second protrusion (61) extending in a ring shape along an edge of the upper cover (6), the second protrusion (61) being located on the outer side of the first protrusion (25) and cooperating with an outer peripheral wall of the first protrusion (25), the upper cover (6) and the valve (2) jointly defining a second installation space, the second protrusion (61) having a second notch (611), the second notch (611) being arranged opposite to the first notch (251).

10. The explosion-proof valve according to claim 9, characterized in that: The first notches (251) are multiple and are arranged at intervals along the circumferential direction of the first protrusion (25), and the second notches (611) are multiple and correspond one-to-one to the multiple first notches (251).

11. The explosion-proof valve according to claim 2, characterized in that: The guide rod (32) is threadedly connected to the valve (2); And / or, the guide rod (32) is threadedly connected to the first magnetic attraction member (33).

12. The explosion-proof valve according to claim 1, characterized in that: The base (1) is connected to the shell via a fastener; Alternatively, the base (1) is threadedly connected to the shell.

13. The explosion-proof valve according to claim 1, characterized in that: A first sealing groove (12) is provided on the end surface of the base (1) facing away from the valve (2). The first sealing groove (12) is arranged around the drive assembly (3). A first sealing ring (13) is provided in the first sealing groove (12). The first sealing ring (13) is suitable for abutting against the shell.

14. The explosion-proof valve according to claim 1, characterized in that: A second sealing ring (14) is provided between the base (1) and the valve (2); the second sealing ring (14) is arranged around the through hole (11); and a second sealing groove (15) for accommodating the second sealing ring (14) is provided on an end surface of the base (1) facing the valve (2).

15. A battery pack, characterized in that: It comprises an explosion-proof valve (100) according to any one of claims 1-14.

16. An electrical equipment, characterized in that: Includes the battery pack as claimed in claim 15.

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