Explosion-proof valve, cover plate assembly, battery pack and electric equipment

Abstract

The utility model discloses an anti-explosion valve, a cover plate assembly, a battery pack and electric equipment. The anti-explosion valve comprises a valve body, an elastic assembly and a second sealing piece, the valve body is provided with an inner cavity which is communicated with the battery pack and the external environment. The elastic assembly comprises an elastic piece and a first sealing piece, the elastic piece is connected with the first sealing piece, and the first sealing piece is arranged in the inner cavity. The first sealing piece is in sealing fit with the opening, facing the battery pack, of the inner cavity, the elastic piece deforms due to the fact that the pressure difference between the inner cavity and the battery pack reaches a first threshold value, and a gap is formed between the first sealing piece and the opening, facing the battery pack, of the inner cavity, so that the battery pack is communicated with the inner cavity. The second sealing piece is arranged in the inner cavity, the second sealing piece is in sealing fit with the opening, facing the external environment, of the inner cavity, and the second sealing piece deforms due to the fact that the pressure difference between the inner cavity and the external environment reaches a second threshold value, so that the inner cavity is communicated with the external environment. When the elastic piece of the anti-explosion valve is opened accidentally, impurities in the external environment are blocked through the first sealing piece, so that the elastic piece can be reset.

Description

Technical Field

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

[0002] With the rapid development of new energy today, new energy battery systems have increasingly higher requirements for thermal runaway. In order to ensure rapid pressure relief and exhaust when thermal runaway occurs, battery packs are generally equipped with explosion-proof valves.

[0003] In the related art, for a spring-type explosion-proof valve, after the explosion-proof valve is opened, it is easy for foreign matter to enter the opening position, causing it to get stuck and unable to be reset, resulting in sealing failure. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide an explosion-proof valve, a cover plate assembly, a battery pack and an electrical device, in which when the elastic member of the explosion-proof valve is accidentally opened, impurities in the external environment are blocked by a first sealing member, so that the elastic member can be reset to avoid sealing failure.

[0005] An explosion-proof valve according to an embodiment of the first aspect of the utility model includes: a valve body, an elastic component and a second sealing member.

[0006] The valve body has an inner cavity, and the inner cavity is used to connect the battery pack with the external environment.

[0007] The elastic component includes an elastic member and a first sealing member, the elastic member is connected to the first sealing member, the first sealing member is arranged in the inner cavity, and the first sealing member is sealed with an opening of the inner cavity toward the battery pack, wherein the elastic member is deformed due to the pressure difference between the inner cavity and the battery pack reaching a first threshold value, and a gap is formed between the first sealing member and the opening of the inner cavity toward the battery pack, so that the battery pack is connected to the inner cavity.

[0008] The second seal is arranged in the inner cavity, and the second seal is sealed with the opening of the inner cavity toward the external environment, wherein the second seal is deformed when the pressure difference between the inner cavity and the external environment reaches a second threshold value, so that the inner cavity is connected with the external environment.

[0009] In this embodiment, when the electrical equipment (for example, an electric vehicle) is subjected to an unexpected impact, collision, etc., the elastic member of the elastic assembly is deformed, thereby causing a first gap to be formed between the first sealing member and the opening of the inner cavity toward the battery pack, so that the battery pack is connected to the inner cavity. At that moment, the battery pack is in a normal working state, the air pressure in the inner cavity of the valve body is lower than the air pressure of the external environment, and the second sealing member and the second opening are still sealed. In this way, the gas from the external environment is inhibited from entering the inner cavity of the valve body through the second opening, thereby preventing impurities in the external environment from entering the inner cavity of the valve body, and fundamentally avoiding the inability of the elastic member to reset due to impurities adhering to the first opening.

[0010] According to some embodiments of the present invention, the position where the second sealing member contacts the cavity wall of the inner cavity is higher than the middle portion of the second sealing member.

[0011] According to some embodiments of the present invention, the thickness of the second sealing member at the position where the second sealing member contacts the cavity wall of the inner cavity is smaller than the thickness of the middle portion of the second sealing member.

[0012] According to some embodiments of the present invention, an air intake path and an exhaust path are provided.

[0013] According to some embodiments of the present invention, a third sealing member is further included which is arranged in the inner cavity.

[0014] The third sealing member is located between the second sealing member and the first sealing member,

[0015] The second sealing member is provided with a through hole, and the third sealing member is in sealing cooperation with the through hole, wherein the third sealing member is deformed when the pressure difference between the inner cavity and the external environment reaches a third threshold value, so that the inner cavity is connected with the external environment.

[0016] The elastic component is provided with a communicating air path connecting the inner cavity and the battery pack.

[0017] According to some embodiments of the present invention, a support portion is provided on the inner surface of the cavity wall of the inner cavity, and a through hole is provided on the support portion.

[0018] The second sealing member is connected to the surface of the support portion facing the external environment, and the through hole is communicated with the through hole. The third sealing member is connected to the surface of the support portion facing the battery pack.

[0019] According to some embodiments of the utility model, the support portion is further provided with a groove, the support portion is sunken on the surface facing the battery pack to form the groove, and the groove is communicated with the through hole.

[0020] According to some embodiments of the present invention, a breathable membrane is further included, and the breathable membrane is arranged in the inner cavity and / or the communicating air path.

[0021] According to some embodiments of the utility model, a protective cover is further included, wherein air holes are provided on the side wall of the protective cover, the area of ​​the air holes is S1, the area of ​​the side wall of the protective cover is S2, and 0≤S1≤10%S2.

[0022] A cover plate assembly according to an embodiment of the second aspect of the utility model comprises a cover plate and the explosion-proof valve in the first aspect.

[0023] The cover plate is provided with a cover plate through hole; the explosion-proof valve is connected to the cover plate and blocks the cover plate through hole.

[0024] A battery pack according to an embodiment of the third aspect of the utility model includes the cover plate assembly described in the second aspect.

[0025] An electrical device according to an embodiment of the fourth aspect of the utility model comprises the battery pack described in the third aspect.

[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 Schematic diagram of explosion of explosion-proof valve according to the embodiment of the utility model Figure 1 ;

[0029] Figure 2 Schematic diagram of explosion of explosion-proof valve according to the embodiment of the utility model Figure 2 ;

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

[0031] Figure 4 yes Figure 3 BB direction cross section Figure 1 ;

[0032] Figure 5 yes Figure 3 AA direction cross-sectional view;

[0033] Figure 6 yes Figure 3 BB direction cross section Figure 2 ;

[0034] Protective cover 10, air hole 11;

[0035] Pressing plate 20;

[0036] A second sealing member 31, a through hole 311, a third sealing member 32, a fourth sealing member 33, a fifth sealing member 34, and a sixth sealing member 35;

[0037] Valve cylinder 40, support plate 41, through hole 411, groove 412, support arm 42;

[0038] Breathable membrane 50, valve seat 60, first communication hole 61, hollow area 62;

[0039] Elastic component 70 , lower sealing cover 71 , elastic member 72 , guide rod 73 , long hole 731 , upper sealing cover 74 , second communication hole 741 . DETAILED DESCRIPTION

[0040] The embodiments of the present invention are 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 invention, and cannot be understood as limiting the present invention.

[0041] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the utility model. In addition, the utility model can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the applicability of other processes and / or the use of other materials.

[0042] In practical applications, the electrical equipment includes a battery pack, and the electrical equipment may be a battery car, an electric motorcycle, an electric toy car, and the like.

[0043] The battery pack includes a shell, an end cap assembly and a battery cell. The end cap assembly is arranged at the opening of the shell, and the battery cell is arranged inside the shell and covered by the end cap assembly. A large amount of gas and heat is generated inside the battery cell due to a fault, and a large amount of gas and heat cannot be diffused or discharged to the external environment in time, which leads to the explosion of the battery pack and safety problems of the battery pack.

[0044] Based on this, the battery pack is equipped with an explosion-proof valve to avoid safety problems with the battery pack. The explosion-proof valve is set on the end cover assembly of the battery pack, and the explosion-proof valve is connected to the inside of the battery pack. When a battery pack fails, a large amount of gas and heat is generated inside the battery pack. At this moment, the explosion-proof valve is opened. The explosion-proof valve diffuses or discharges the gas and heat to the external environment as soon as possible, thereby avoiding safety problems with the battery pack. Among them, after the explosion-proof valve is opened, the explosion-proof valve is equivalent to connecting the inside of the battery pack with the external environment.

[0045] The explosion-proof valve of this embodiment is a spring-type. In the related art, for the spring-type explosion-proof valve, after the explosion-proof valve is opened, foreign matter easily enters the opening position, causing it to get stuck and unable to reset, resulting in sealing failure.

[0046] Based on this, Figure 1-Figure 6 As shown, a first aspect of this embodiment provides an explosion-proof valve, including: a valve body, an elastic component 70 and a second sealing member 31 .

[0047] The valve body has an inner cavity, and the inner cavity is used to connect the battery pack with the external environment.

[0048] The elastic component 70 is installed in the inner cavity, and the elastic component 70 has an elastic member 72 and a first seal, and the elastic member 72 is connected to the first seal, and the first seal is sealed with the opening of the inner cavity toward the battery pack. The elastic member 72 is deformed when the pressure difference between the inner cavity and the battery pack reaches a first threshold, and a gap is formed between the first seal and the opening of the inner cavity toward the battery pack, so that the battery pack is connected to the inner cavity.

[0049] The second seal 31 is installed in the inner cavity, and the second seal 31 is sealed with the opening of the inner cavity toward the external environment. The second seal 31 is deformed when the pressure difference between the inner cavity and the external environment reaches a second threshold, so that the inner cavity is connected with the external environment.

[0050] It should be noted that the opening of the inner cavity of the valve body facing the battery pack is defined as the first opening, and the opening of the inner cavity of the valve body facing the external environment is defined as the second opening.

[0051] In practical applications, such as Figure 1 and Figure 2 As shown, the elastic component 70 may include an elastic member 72, a first sealing member and a guide rod 73. The elastic member 72 may be a spring, such as a tension spring. The first sealing member may be made of rubber, plastic material, etc., or other materials, which is not limited in this embodiment.

[0052] The first sealing member is movably connected to one end of the guide rod 73, for example, the first sealing member is sleeved on one end of the guide rod 73, and the first sealing member can move along the extension direction of the guide rod 73. The elastic member 72 is sleeved on the guide rod 73, one end of the elastic member 72 is connected to the first sealing member, and the other end is connected to the other end of the guide rod 73, so that the elastic member 72 is press-fitted.

[0053] Of course, it is understandable that the elastic component 70 may not include the guide rod 73. For example, the elastic component 70 includes an elastic member 72 and a first sealing member, one end of the elastic member 72 is connected to the first sealing member, and the other end may be connected to the cover plate component. This embodiment does not limit this.

[0054] The second sealing member 31 has good elasticity and plasticity, and can be a second rubber sealing member, a second plastic sealing member, or a second sealing member 31 made of other suitable materials.

[0055] Normal working principle of explosion-proof valve:

[0056] like Figure 4 As shown, when the battery pack fails, a large amount of gas or heat is generated inside the battery pack. The air pressure inside the battery pack increases, and at the current moment, the air pressure inside the battery pack is greater than the air pressure in the inner cavity of the valve body. Then, the elastic member 72 of the elastic component 70 is deformed, and the seal between the first seal and the opening of the inner cavity toward the battery pack fails, forming a first gap between the two. The large amount of gas or heat mentioned above can be diffused or discharged into the inner cavity of the valve body through the first gap.

[0057] When the large amount of gas or heat mentioned above enters the inner cavity of the valve body, the air pressure in the inner cavity of the valve body increases, and at the current moment, the air pressure in the inner cavity is greater than the air pressure of the external environment. Then, the second seal 31 is deformed because the pressure difference between the inner cavity and the external environment reaches the second threshold, and the seal between the second seal 31 and the second opening fails, and a second gap is formed between the two. The large amount of gas or heat mentioned above can be diffused or discharged into the external environment through the second gap. In this way, the explosion-proof valve generates a large amount of gas and heat inside the battery pack, and the explosion-proof valve can diffuse or discharge the gas and heat to the external environment in the first time, thereby avoiding safety problems in the battery pack.

[0058] The gas in the battery pack is basically diffused or discharged to the inner cavity of the valve body. When the gas pressure of the battery pack is lower than the gas pressure of the inner cavity of the valve body, the elastic member 72 returns to its initial state, and the first seal is again sealed with the first opening. The gas in the inner cavity of the valve body is basically diffused or discharged to the external environment. When the gas pressure of the cavity of the valve body is lower than the gas pressure of the external environment, the second seal 31 returns to its initial shape, and the second seal is again sealed with the second opening.

[0059] When an electrical device (for example, an electric vehicle) is subjected to an unexpected impact or collision, the elastic member 72 of the elastic assembly 70 will deform due to inertia, thereby forming a first gap between the first seal and the opening of the inner cavity toward the battery pack, so that the battery pack is connected to the inner cavity. At that moment, the battery pack is in a normal working state, the air pressure in the inner cavity of the valve body is lower than the air pressure of the external environment, and the second seal 31 and the second opening are still sealed. This inhibits the gas from the external environment from entering the inner cavity of the valve body through the second opening, thereby preventing impurities in the external environment from entering the inner cavity of the valve body, and fundamentally avoiding the inability of the elastic member 72 to reset due to impurities adhering to the first opening.

[0060] In summary, when thermal runaway occurs in the battery pack, the battery pack is in the first working mode, such as Figure 4 shown.

[0061] The air pressure in the battery pack increases, and at this moment the air pressure in the battery pack is greater than the air pressure in the inner cavity of the valve body. Then the elastic member 72 of the elastic component 70 is deformed, and the seal between the first seal and the opening of the inner cavity toward the battery pack fails, and a first gap is formed between the two. The above-mentioned large amount of gas or heat enters the inner cavity of the valve body, and the air pressure in the inner cavity of the valve body increases. At this moment, the air pressure in the inner cavity is greater than the air pressure of the external environment. Then the second seal 31 is deformed because the pressure difference between the inner cavity and the external environment reaches the second threshold, and the seal between the second seal 31 and the second opening fails, and a second gap is formed between the two. The above-mentioned large amount of gas or heat can be diffused or discharged to the external environment through the second gap. In this way, the explosion-proof valve generates a large amount of gas and heat inside the battery pack, and the explosion-proof valve can diffuse or discharge the gas and heat to the external environment in the first time, thereby avoiding safety problems in the battery pack.

[0062] In addition, when the electrical equipment (for example, an electric vehicle) is subjected to an unexpected impact, collision, etc., the elastic member of the elastic assembly is deformed. This causes a first gap to be formed between the first seal and the opening of the inner cavity toward the battery pack. At that moment, the battery pack is in a normal working state, the air pressure in the inner cavity of the valve body is lower than the air pressure of the external environment, and the second seal 31 and the second opening are still sealed. This inhibits the gas from the external environment from entering the inner cavity of the valve body through the second opening, thereby preventing impurities in the external environment from entering the inner cavity of the valve body, and fundamentally avoiding the inability of the elastic member 72 to reset due to impurities adhering to the first opening.

[0063] In some embodiments of the present invention, the position where the second sealing member 31 contacts the cavity wall of the inner cavity is higher than the middle portion of the second sealing member 31 .

[0064] In a specific embodiment, Figure 1-Figure 6As shown, the valve body includes a valve seat 60 and a valve cylinder 40, and the valve seat 60 and the valve cylinder 40 are connected as one body by a threaded connection (or an insert connection, a snap connection, etc.). The valve seat 60 is provided with a first communication hole 61 and a plurality of hollow areas 62, and the plurality of hollow areas 62 are arranged around the first communication hole 61, and the first communication hole 61 allows the guide rod 73 to pass through. The first sealing member is in sealing cooperation with the first opening, that is, the first sealing member is in sealing cooperation with each hollow area 62, and the plurality of hollow areas 62 constitute the above-mentioned first opening.

[0065] A plurality of support arms 42 and a support plate 41 are provided in the valve cylinder 40. The support plate 41 is located in the middle of the valve cylinder 40 and close to the opening of the valve cylinder 40 facing away from the valve seat 60. The plurality of support arms 42 are arranged around the support plate 41 at equal intervals, and each support arm 42 is connected to the cylinder wall of the valve cylinder 40 and the support plate 41. The second sealing member 31 is connected to the support plate 41, and the second sealing member 31 is sealed with the opening of the valve cylinder 40 facing away from the valve seat 60. Among them, the opening of the valve cylinder 40 facing away from the valve seat 60 is the above-mentioned second opening.

[0066] like Figure 4-Figure 6 As shown, the position where the second sealing member 31 contacts the inner surface of the valve cylinder 40 is higher than the middle of the second sealing member 31. In this way, the air pressure in the inner cavity of the valve body is slightly greater than the air pressure of the external environment, and the second sealing member 31 can be deformed due to the slight pressure difference, which helps the gas and heat in the valve body to diffuse or discharge to the external environment in the first time.

[0067] Alternatively, if Figure 4-Figure 6 As shown, the thickness of the second sealing member 31 at the position where it contacts the cavity wall of the inner cavity is smaller than the thickness of the middle portion of the second sealing member 31 .

[0068] It can be understood that the thickness of the second sealing member 31 at the position where it contacts the inner surface of the valve cylinder 40 is smaller than the thickness of the middle portion of the second sealing member 31 .

[0069] In this way, the air pressure in the inner cavity of the valve body is slightly greater than the air pressure of the external environment, and the edge of the second sealing member 31 can be deformed due to the slight pressure difference, which helps the gas and heat in the valve body to diffuse or be discharged to the external environment in the first time.

[0070] In some embodiments of the present invention, Figure 5 As shown, the explosion-proof valve is provided with an air intake path a and an exhaust path b.

[0071] It should be noted that in actual applications, if the battery pack is fully sealed, the internal pressure will be too high, resulting in a pressure difference and causing failure. Based on this, the explosion-proof valve is equipped with an air intake channel and an exhaust channel to keep the internal and external pressure difference of the battery pack balanced at all times.

[0072] In a specific embodiment, Figure 5As shown, the first sealing member includes an upper sealing cover 74 and a lower sealing cover 71, wherein the upper sealing cover 74 has an upper cavity, and the lower sealing cover 71 has a lower cavity. The upper sealing cover 74 is connected to the lower sealing cover 71, and the upper cavity and the lower cavity form a connecting cavity. Among them, the lower sealing cover 71 is movably connected to the guide rod 73, and a long hole 731 is provided inside the guide rod 73, and the long hole 731 makes the connecting cavity communicate with the interior of the battery pack. A plurality of second connecting holes 741 are provided on the side wall of the upper sealing cover 74, and the second connecting holes 741 connect the inner cavity of the valve body with the connecting cavity. The second connecting holes 741, the connecting cavity and the long hole 731 are defined as a connecting air path, and the elastic component 70 is provided with the connecting air path.

[0073] The second sealing member 31 is provided with a through hole 311 communicating with the external environment and a first connecting hole. The number of the through hole 311 may be one, two, three, ... .

[0074] like Figure 5 As shown, the explosion-proof valve further includes a third sealing member 32, which is disposed in the inner cavity of the valve body and is located between the second sealing member 31 and the first sealing member. The third sealing member 32 is sealed with the through hole 311. The third sealing member 32 is formed when the pressure difference between the inner cavity and the external environment reaches a third threshold value, so as to connect the inner cavity with the external environment.

[0075] In detail, Figure 5 As shown, a through hole 411 and a second connecting hole are provided on the support plate 41, and the through hole 411 corresponds to the through hole 311 one by one. The second seal 31 is connected to the surface of the support plate 41 facing the external environment, and each through hole 411 corresponds to a through hole 311, so that the two are connected to each other. The third seal 32 is connected to the surface of the support plate 41 facing the battery pack, and the third seal 32 is sealed with the through hole 411. Among them, the third seal 32 is provided with a third connecting hole, and the fastener passes through the third connecting hole, the second connecting hole, and the first connecting hole in sequence, and is connected to the pressing plate 20. The pressing plate 20 is pressed on the first seal 31, so that the second seal 31 and the third seal 32 are connected to the support plate 41. A support portion is provided on the inner surface of the cavity wall of the inner cavity, and the support portion is the above-mentioned support plate 41.

[0076] Usually, the deformation pressure of the second sealing member 31 and the third sealing member 32 is less than about 50% of the bursting pressure relief pressure.

[0077] Therefore, the intake path a: Figure 5 As shown, the gas from the external environment passes through the through hole 311 of the second seal 31 and the through hole 411 of the support plate 41 in sequence to the third seal 32. When the air pressure of the external environment is greater than the air pressure of the inner cavity of the valve body, the third seal 32 is deformed to achieve communication between the inner cavity and the external environment. The inner cavity of the valve body is connected to the interior of the battery pack through the connecting air path of the elastic component 70.

[0078] Exhaust path b: Figure 5 As shown, the interior of the battery pack is connected to the inner cavity of the valve body through the connecting air path of the elastic component 70. When the pressure of the inner cavity is greater than the pressure of the external environment, the second sealing member 31 is deformed to achieve communication between the inner cavity and the external environment.

[0079] Alternatively, if Figure 5 As shown, a groove 412 is provided on the surface of the support plate 41 facing the battery pack, and the groove 412 is connected to the through hole 411. The groove 412 can store gas from the outside. In the air intake path a, the groove 412 gathers more gas, which helps to deform the third sealing member 32.

[0080] Optionally, a breathable membrane 50 is provided on the communicating air path of the elastic component 70 .

[0081] In a specific embodiment, Figure 1-Figure 5 As shown, the breathable membrane 50 is installed between the upper sealing cover 74 and the lower sealing cover 71, and the breathable membrane 50 separates the upper cavity of the upper sealing cover 74 and the lower cavity of the lower sealing cover 71. When the gas from the external environment reaches the breathable membrane 50, the breathable membrane 50 can block impurities carried by the gas from the external environment and prevent them from entering the interior of the battery pack.

[0082] Optionally, the breathable membrane 50 is disposed in the inner cavity of the valve body. Similarly, the breathable membrane 50 can block impurities carried by gas from the external environment from entering the interior of the battery pack.

[0083] In summary, when the battery pack is working normally, the battery pack is in the second working mode, such as Figure 5 At this moment, the gas from the external environment passes through the through hole 311 of the second seal 31 and the through hole 411 of the support plate 41 in sequence to the third seal 32. When the air pressure of the external environment is greater than the air pressure of the inner cavity of the valve body, the third seal 32 is deformed, allowing the gas from the external environment to enter the interior of the battery pack.

[0084] The internal gas of the battery pack passes through the long hole 731 of the guide rod 73 and the second connecting hole 741 of the upper sealing cover 74 in turn, and enters the inner cavity of the valve body. When the pressure of the inner cavity is greater than the pressure of the external environment, the second sealing member 31 is deformed, so that the gas inside the battery pack can enter the external environment. In this way, the explosion-proof valve can balance the internal and external pressures of the battery pack and realize its own ventilation function.

[0085] In some embodiments of the present invention, the explosion-proof valve further comprises a protective cover 10. An air hole 11 is provided on the protective cover 10, and the protective cover 10 covers the opening of the inner cavity of the valve body facing the external environment.

[0086] In a specific embodiment, Figure 1or Figure 2 As shown, the protective cover 10 is disposed on the opening of the valve cylinder 40 facing away from the valve seat 60, and the two can be snap-connected, threaded, inserted, etc.

[0087] A plurality of air holes 11 are provided on the side wall of the protective cover 10, and the area of ​​the air holes 11 is S1. The area of ​​the side wall of the protective cover 10 is S2, and 0≤S1≤10%S2. On the premise of ensuring that the inner cavity of the valve body is connected to the external environment, the protective cover 10 protects the second sealing member 31 to prevent the second sealing member 31 from being accidentally hit.

[0088] In some embodiments of the present invention, Figure 5 As shown, the explosion-proof valve further includes a fourth sealing member 33 , a fifth sealing member 34 and a sixth sealing member 35 .

[0089] In a specific embodiment, a fourth seal 33 is provided between the lower sealing cover 71 and the valve seat 60; a fifth seal 34 is provided between the valve seat 60 and the valve cylinder 40; and a sixth seal 35 is provided between the valve seat 60 and the cover assembly of the battery pack.

[0090] A second aspect of the present embodiment provides a cover plate assembly, comprising a cover plate and the explosion-proof valve of the first aspect.

[0091] The cover plate is provided with a cover plate through hole 311; the explosion-proof valve is connected to the cover plate and blocks the cover plate through hole 311. The cover plate assembly has the advantages of the explosion-proof valve, so it is not described in detail.

[0092] A third aspect of the present embodiment provides a battery pack, comprising the cover plate assembly of the second aspect.

[0093] The battery pack has the advantage of an explosion-proof valve, so it will not be described in detail.

[0094] A fourth aspect of this embodiment provides an electrical device, comprising the battery pack in the third aspect.

[0095] This electrical equipment has the advantages of explosion-proof valves, so I will not go into details.

[0096] In the description of the present invention, 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 invention 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 invention.

[0097] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0098] In the description of the present invention, "plurality" means two or more.

[0099] In the description of the present invention, a first feature being “above” or “below” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact but are in contact with each other via another feature therebetween.

[0100] In the description of the present invention, a first feature “above”, “over” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0101] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", "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 representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0102] 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: include: A valve body, wherein the valve body has an inner cavity, and the inner cavity is used to connect the battery pack with the external environment; An elastic component (70), the elastic component (70) comprising an elastic member (72) and a first sealing member, the elastic member (72) being connected to the first sealing member, the first sealing member being arranged in the inner cavity, the first sealing member being in sealing cooperation with an opening of the inner cavity toward the battery pack, wherein the elastic member (72) is deformed due to a pressure difference between the inner cavity and the battery pack reaching a first threshold value, and a gap is formed between the first sealing member and the opening of the inner cavity toward the battery pack, so that the battery pack is connected to the inner cavity; A second sealing member (31), wherein the second sealing member (31) is arranged in the inner cavity, and the second sealing member (31) is sealedly matched with an opening of the inner cavity toward the external environment, wherein the second sealing member (31) is deformed when the pressure difference between the inner cavity and the external environment reaches a second threshold value, so that the inner cavity is connected with the external environment.

2. The explosion-proof valve according to claim 1, characterized in that: The position where the second sealing member (31) contacts the cavity wall of the inner cavity is higher than the middle portion of the second sealing member (31).

3. The explosion-proof valve according to claim 1, characterized in that: The thickness of the second sealing member (31) at a position where it contacts the cavity wall of the inner cavity is smaller than the thickness of the middle portion of the second sealing member (31).

4. The explosion-proof valve according to claim 1, characterized in that: An air intake path and an exhaust path are provided.

5. The explosion-proof valve according to claim 4, characterized in that: It also includes a third sealing member (32) disposed in the inner cavity, The third sealing member (32) is located between the second sealing member (31) and the first sealing member, The second sealing member (31) is provided with a through hole (311), and the third sealing member (32) is in sealing cooperation with the through hole (311), wherein the third sealing member (32) is deformed when the pressure difference between the inner cavity and the external environment reaches a third threshold value, so that the inner cavity is connected with the external environment. The elastic component (70) is provided with a communicating air path connecting the inner cavity and the battery pack.

6. The explosion-proof valve according to claim 5, characterized in that: A support portion is provided on the inner surface of the cavity wall of the inner cavity, and a through hole (411) is provided on the support portion. The second sealing member (31) is connected to the surface of the support portion facing the external environment, and the through hole (311) is connected to the through hole (411), and the third sealing member (32) is connected to the surface of the support portion facing the battery pack.

7. The explosion-proof valve according to claim 6, characterized in that: The support portion is also provided with a groove (412), the support portion is recessed on the surface facing the battery pack to form the groove (412), and the groove (412) is communicated with the through hole (411).

8. The explosion-proof valve according to claim 5, characterized in that: It also comprises a breathable membrane (50), wherein the breathable membrane (50) is arranged in the inner cavity and / or the communicating air path.

9. The explosion-proof valve according to claim 1, characterized in that: It also comprises a protective cover (10), wherein an air hole (11) is provided on the cover side wall of the protective cover (10), the area of ​​the air hole (11) is S1, the area of ​​the cover side wall of the protective cover (10) is S2, and 0≤S1≤10%S2.

10. A cover plate assembly, characterized in that: comprising a cover plate and an explosion-proof valve as described in any one of claims 1 to 9, The cover plate is provided with a cover plate through hole; the explosion-proof valve is connected to the cover plate and blocks the cover plate through hole.

11. A battery pack, characterized in that: The invention comprises the cover plate assembly as claimed in claim 10.

12. An electrical device, characterized in that: A battery pack comprising the battery pack of claim 11.

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