Explosion-proof valves, battery devices, energy storage devices and electrical devices

Abstract

The embodiments of the present application provide an explosion-proof valve, a battery device, an energy storage device and an electrical device, which belong to the field of battery technology. The explosion-proof valve includes: a valve body, which forms a pressure relief channel and a pressure relief port; a valve cover, which is installed on the valve body; a sealing membrane, which is installed on the valve body, used to separate the pressure relief channel and the pressure relief port, and includes a first section, a second section and a sealing section connected in sequence, the first section is connected to the valve body, and a cavity connected to the pressure relief port is formed between the second section and the valve body, and the sealing section is used to seal with the valve body; a piston is arranged in the valve body, facing the pressure relief channel, and the sealing section is clamped between the piston and the valve body; an elastic member abuts the valve cover, which is used to press the sealing section toward the valve body by pressing the piston. The use of this structure realizes the one-way ventilation function of the explosion-proof valve, optimizes the sealing performance of the explosion-proof valve in the natural state, improves the reliability of the battery device, reduces the shaking and displacement of the sealing membrane in the sealed state, and improves the accuracy of the sealing membrane reset.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to an explosion-proof valve, a battery device, an energy storage device, and an electrical device. Background Art

[0002] With the update and iteration of large batteries in the energy storage industry, safety issues have become a focus. The explosion-proof valve is a core component that balances the internal pressure of the battery device, protecting the battery device from overcharge or over discharge, and avoiding battery explosion accidents. However, the existing explosion-proof valves have problems such as insufficient sealing performance and easy leakage in the natural state, resulting in frequent gas exchange between the battery device and the external environment, reducing the reliability of the battery device, thereby reducing the reliability of the energy storage device. Summary of the invention

[0003] The present application provides an explosion-proof valve, a battery device, an energy storage device and an electrical device to realize the one-way ventilation function of the explosion-proof valve.

[0004] In a first aspect, an embodiment of the present application provides a battery device, including:

[0005] Box;

[0006] At least one battery cell assembly is contained in the box;

[0007] An explosion-proof valve is installed on the box; wherein the explosion-proof valve comprises:

[0008] The valve body forms a pressure relief passage and a pressure relief port;

[0009] A valve cover, mounted on the valve body;

[0010] a sealing membrane, mounted on the valve body, used to separate the pressure relief channel and the pressure relief port, and comprising a first section, a second section and a sealing section connected in sequence, wherein the first section is connected to the valve body, a cavity communicating with the pressure relief port is formed between the second section and the valve body, and the sealing section is used to seal with the valve body;

[0011] A piston is disposed in the valve body, and the sealing section is clamped between the piston and the valve body;

[0012] An elastic member, one end of which abuts against the valve cover, and the other end of which presses the sealing section toward the valve body by pressing the piston.

[0013] In the above technical scheme, through the cooperation between the above elastic parts, piston and sealing film, on the one hand, the box can release pressure from the inside to the outside through the explosion-proof valve, and air cannot enter from the outside to the inside, thereby realizing the one-way ventilation function of the explosion-proof valve. On the other hand, the piston and the sealing film are closely cooperated to seal the pressure relief channel, thereby optimizing the sealing performance of the explosion-proof valve in a natural state, greatly reducing the frequency and total amount of gas exchange between the inside of the box and the outside, and reducing the generation of condensed water inside the box, thereby improving the reliability of the battery device, and then improving the reliability of the energy storage device. On the other hand, through the connection between the first section and the valve body, the shaking and deviation of the sealing film in the sealed state are reduced, and the accuracy of the sealing film resetting after the explosion pressure relief is improved, thereby comprehensively improving the stability of the sealing film. On the other hand, by setting the cavity, the pressure relief process is made smoother and more controllable, reducing the impact force and destructive force caused by the sudden release of gas.

[0014] In some embodiments, the sealing section includes a main body section and at least one rib connected to a side of the main body section facing away from the valve cover, and the rib is arranged around the outlet of the pressure relief channel and stops at the valve body.

[0015] In some embodiments, in a natural state, the inner diameter of the rib gradually increases from the end connected to the main body section to the end abutting the valve body, and the angle between the inner wall of the rib and the main body section is an obtuse angle, and the angle between the outer wall of the rib and the main body section is an acute angle.

[0016] In some embodiments, the sealing segment includes a plurality of ribs disposed at intervals, and the plurality of ribs are concentrically disposed.

[0017] In some embodiments, the first section is closer to the valve cover than the sealing section, and the second section is inclined.

[0018] In some embodiments, the second section forms an opening, and a width of the opening gradually increases from an end close to the pressure relief channel to an end away from the pressure relief channel.

[0019] In some embodiments, the vertical cross-section of the second segment includes a plurality of arc segments, and the centers of curvature of two adjacent arc segments are respectively located on two sides of the second segment.

[0020] In some embodiments, a first mounting groove is defined on a side of the valve body close to the valve cover, and the first section is mounted in the first mounting groove and elastically compressed between the valve cover and the valve body.

[0021] In some embodiments, the sealing membrane further includes a limiting boss, the limiting boss protrudes from the sealing section toward the valve cover, and a limiting groove is defined between the limiting boss and the sealing section, and at least a portion of the piston is installed in the limiting groove.

[0022] In some embodiments, the sealing film further includes an extension portion, and the extension portion extends from the limiting boss toward the center of the valve body so that the extension portion, the limiting boss and the sealing segment wrap around the edge of the piston.

[0023] In some embodiments, the elastic member is elastically compressed between the valve cover and the extension portion.

[0024] In some embodiments, the piston includes a protrusion protruding toward the direction close to the valve cover, a second mounting groove is formed between the protrusion, the limiting boss and the extension portion, and one end of the elastic member facing away from the valve cover abuts against the bottom wall of the second mounting groove.

[0025] In some embodiments, the valve cover is provided with a plurality of clips spaced apart and distributed along the circumferential direction, and the valve body is provided with a plurality of slots corresponding one-to-one to the plurality of clips and snap-fitting with the plurality of clips.

[0026] In some embodiments, the explosion-proof valve further comprises:

[0027] A nut and a first seal, wherein the nut is threadedly connected to the outer surface of the valve body, the valve body defines a third installation groove for installing the first seal, the third installation groove faces the nut, and a gap is formed between the nut and the first seal for clamping the box body.

[0028] In some embodiments, the explosion-proof valve further comprises:

[0029] A second sealing member, a fourth mounting groove is formed on the outer periphery of the valve body, and the second sealing member is mounted in the fourth mounting groove.

[0030] In some embodiments, the valve body, the valve cover, the sealing membrane and the piston are all plastic parts.

[0031] In a second aspect, an embodiment of the present application provides an explosion-proof valve, comprising:

[0032] The valve body forms a pressure relief passage and a pressure relief port;

[0033] A valve cover, mounted on the valve body;

[0034] A sealing membrane is installed between the valve body and the valve cover, and is used to separate the pressure relief channel and the pressure relief port, and comprises a first section, a second section and a sealing section which are connected in sequence, wherein the first section is connected to the valve body, a cavity communicating with the pressure relief port is formed between the second section and the valve body, and the sealing section is used to seal with the valve body;

[0035] A piston is disposed in the valve body, the sealing section is clamped between the piston and the valve body, and the piston faces the pressure relief passage;

[0036] An elastic member, one end of which abuts against the valve cover, and the other end of which presses the sealing section toward the valve body by pressing the piston.

[0037] In the above technical scheme, through the cooperation between the above elastic parts, piston and sealing film, on the one hand, the box can release pressure from the inside to the outside through the explosion-proof valve, and air cannot enter from the outside to the inside, thereby realizing the one-way ventilation function of the explosion-proof valve. On the other hand, the piston and the sealing film are closely cooperated to seal the pressure relief channel, thereby optimizing the sealing performance of the explosion-proof valve in a natural state, greatly reducing the frequency and total amount of gas exchange between the inside of the box and the outside, and reducing the generation of condensed water inside the box, thereby improving the reliability of the battery device, and then improving the reliability of the energy storage device. On the other hand, through the connection between the first section and the valve body, the shaking and deviation of the sealing film in the sealed state are reduced, and the accuracy of the sealing film resetting after the explosion pressure relief is improved, thereby comprehensively improving the stability of the sealing film. On the other hand, by setting the cavity, the pressure relief process is made smoother and more controllable, reducing the impact force and destructive force caused by the sudden release of gas.

[0038] In a third aspect, an embodiment of the present application provides an energy storage device, comprising:

[0039] A battery device as described above.

[0040] In the above technical scheme, through the setting of the above battery device, on the one hand, the box can release pressure from the inside to the outside through the explosion-proof valve, and air cannot enter from the outside to the inside, thereby realizing the one-way ventilation function of the explosion-proof valve. On the other hand, the piston and the sealing membrane are closely cooperated to seal the pressure relief channel, thereby optimizing the sealing performance of the explosion-proof valve in a natural state, greatly reducing the frequency and total amount of gas exchange between the inside of the box and the outside, and reducing the generation of condensed water inside the box, thereby improving the reliability of the battery device, and then improving the reliability of the energy storage device. On the other hand, through the connection between the first section and the valve body, the shaking and deviation of the sealing membrane in the sealed state are reduced, and the accuracy of the sealing membrane resetting after the explosion pressure relief is improved, thereby comprehensively improving the stability of the sealing membrane. On the other hand, by setting the cavity, the pressure relief process is made smoother and more controllable, reducing the impact force and destructive force caused by the sudden release of gas.

[0041] In a fourth aspect, an embodiment of the present application provides an electrical device, including:

[0042] A battery device as described above.

[0043] In the above technical scheme, through the setting of the above battery device, on the one hand, the box can release pressure from the inside to the outside through the explosion-proof valve, and air cannot enter from the outside to the inside, thereby realizing the one-way ventilation function of the explosion-proof valve. On the other hand, the piston and the sealing membrane are closely cooperated to seal the pressure relief channel, thereby optimizing the sealing performance of the explosion-proof valve in a natural state, greatly reducing the frequency and total amount of gas exchange between the inside of the box and the outside, and reducing the generation of condensed water inside the box, thereby improving the reliability of the battery device, and then improving the reliability of the energy storage device. On the other hand, through the connection between the first section and the valve body, the shaking and deviation of the sealing membrane in the sealed state are reduced, and the accuracy of the sealing membrane resetting after the explosion pressure relief is improved, thereby comprehensively improving the stability of the sealing membrane. On the other hand, by setting the cavity, the pressure relief process is made smoother and more controllable, reducing the impact force and destructive force caused by the sudden release of gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1 A schematic diagram of the structure of an energy storage device provided in some embodiments of the present application;

[0046] Figure 2 An exploded view of the structure of an explosion-proof valve provided in some embodiments of the present application;

[0047] Figure 3 A schematic diagram of the structure of an explosion-proof valve provided in some embodiments of the present application;

[0048] Figure 4 A cross-sectional view of an explosion-proof valve and a box provided in some embodiments of the present application;

[0049] Figure 5 A cross-sectional view of an explosion-proof valve, a box body and a plug provided in some embodiments of the present application;

[0050] Figure 6 A cross-sectional view of a valve body and a sealing membrane provided for some embodiments of the present application;

[0051] Figure 7 One of the cross-sectional views of the sealing film provided in some embodiments of the present application;

[0052] Figure 8 A second cross-sectional view of a sealing film provided in some embodiments of the present application;

[0053] Fig. 9A third cross-sectional view of the sealing film provided in some embodiments of the present application.

[0054] Reference numerals:

[0055] Energy storage device 1, cabinet 2, battery cluster 3;

[0056] Plug 4;

[0057] Explosion-proof valve 10, cavity 101;

[0058] Valve body 11, pressure relief channel 111, pressure relief port 112, first mounting groove 113, third mounting groove 114, fourth mounting groove 115, clamping groove 116;

[0059] Valve cover 12, buckle 121;

[0060] Sealing membrane 13, first section 131, second section 132, opening 1321, sealing section 133, main section 1331, ribs 1332, limiting boss 134, limiting groove 135, extension portion 136;

[0061] Piston 14, protrusion 141, plug head 142, positioning groove 1421, plug core 143;

[0062] A second mounting groove 15, an elastic member 16, a nut 17, a first sealing member 18, and a second sealing member 19;

[0063] Box body 20. DETAILED DESCRIPTION

[0064] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0065] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0066] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0067] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0068] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0069] The term "multiple" as used in the present application refers to more than two (including two). Similarly, the term "multiple groups" refers to more than two groups (including two groups), and the term "multiple sheets" refers to more than two sheets (including two sheets).

[0070] The battery cells mentioned in the embodiments of the present application may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., which are not limited in the embodiments of the present application. The battery cells may be cylindrical, flat, rectangular or other shapes, etc., which are not limited in the embodiments of the present application. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, which are not limited in the embodiments of the present application.

[0071] The battery cell includes a shell, an electrode assembly and an electrolyte, and the shell is used to contain the electrode assembly and the electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as a positive electrode ear. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer. The negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that a large current passes without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together.

[0072] The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a winding structure or a stacked structure, but the embodiments of the present application are not limited thereto.

[0073] In recent years, with the rapid development of energy storage devices, battery devices, as the core components of energy storage devices, have attracted increasing attention for the reliability of batteries. During the use of battery devices, if the pressure inside and outside the battery device is unbalanced, the explosion-proof valve (also called a balancing valve) on the battery device can be used to reduce the pressure difference between the inside and outside of the battery device to improve the reliability of the battery device. Traditional explosion-proof valves are usually composed of valve bodies, valve covers, valve discs, springs and other components. A channel is provided inside the valve body to allow gas or liquid to flow under normal circumstances, and the valve disc is maintained in a certain position by the action of elastic elements such as springs to control the opening and closing of the channel. When the pressure inside the box of the battery device rises to a preset safety threshold, the pressure will act on the valve disc, overcome the elastic force of the spring, and move the valve disc upward, thereby opening the channel and allowing the internal pressure to be quickly released to the external environment. Since the design of the valve disc allows it to move in both directions under pressure, the explosion-proof valve can release pressure outward when the internal pressure is too high, and may also allow external gas or liquid to enter the interior when the external pressure is greater than the internal pressure. However, in actual applications, the above-mentioned explosion-proof valve allows external gas to enter the interior under specific conditions, which increases the risk of external water vapor entering the battery device. Especially in an environment with high humidity, water vapor is particularly likely to enter the battery device through the explosion-proof valve, forming condensed water, causing corrosion and damage to the internal components of the battery device.

[0074] Based on the above considerations, in order to solve the problem that the two-way ventilation of the explosion-proof valve affects the reliability of the battery device, the inventor has designed a battery device after in-depth research, including: a box body, an explosion-proof valve and at least one battery cell assembly, the battery cell assembly is contained in the box body; the explosion-proof valve is installed on the box body; wherein the explosion-proof valve includes: a valve body, a valve cover, a sealing film, a piston and an elastic member. The valve body forms a pressure relief channel and a pressure relief port; the valve cover is installed on the valve body; the sealing film is installed on the valve body, which is used to separate the pressure relief channel and the pressure relief port, and includes a first section, a second section and a sealing section connected in sequence, the first section is connected to the valve body, and a cavity connected to the pressure relief port is formed between the second section and the valve body, and the sealing section is used to seal with the valve body; the piston is arranged in the valve body, and the sealing section is clamped between the piston and the valve body, and the piston faces the pressure relief channel; one end of the elastic member abuts the valve cover, and the other end of the elastic member presses the sealing section toward the valve body by pressing the piston.

[0075] In an explosion-proof valve of this structure, an elastic member is used to compress the piston and the sealing membrane to isolate the pressure relief channel and the pressure relief port. This structure, on the one hand, realizes the one-way ventilation function of the explosion-proof valve, optimizes the sealing performance of the explosion-proof valve in a natural state, greatly reduces the frequency and total amount of gas exchange between the battery and the outside world, and reduces the amount of condensed water generated inside the battery, thereby improving the reliability of the battery device, and then improving the reliability of the energy storage device. On the other hand, through the connection between the first section and the valve body, the shaking and deviation of the sealing membrane in a sealed state are reduced, and the accuracy of the sealing membrane resetting after the explosion and pressure relief is improved, thereby comprehensively improving the stability of the sealing membrane. On the other hand, by setting the cavity, the pressure relief process is made smoother and more controllable, reducing the impact force and destructive force caused by the sudden release of gas.

[0076] The battery device disclosed in the embodiment of the present application can be used in an energy storage device, which includes one or more battery clusters to increase the voltage and capacity of the energy storage device. The battery cluster may include multiple battery devices, and the multiple battery devices are connected in series through a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0077] The energy storage device can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems or temporary power supply systems. The energy storage device can store electrical energy as needed and output electrical energy at an appropriate time. For example, the energy storage device can store electrical energy during low power consumption and provide electrical energy to relevant users or electrical equipment during peak power consumption. The energy storage system provided in the embodiment of the present application can be any power system that requires the use of an energy storage device.

[0078] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0079] In some embodiments, reference Figure 1 The energy storage device 1 may include a cabinet 2 and a battery cluster 3 , wherein the battery cluster 3 is accommodated in the cabinet 2 .

[0080] The battery device disclosed in the embodiments of the present application can also be used in various electrical devices that use battery cells, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0081] The battery apparatus 1 mentioned in the embodiment of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, in parallel or in mixed connection through a busbar component.

[0082] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.

[0083] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0084] In some embodiments, the battery device may be a battery pack, which includes a case 20 and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case 20 .

[0085] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box body 20 by fixing the battery module in the box body 20 .

[0086] As an example, the battery cell assembly may also be accommodated in the case 20 by directly fixing a plurality of battery cells to the case 20 .

[0087] As an example, the box 20 may include a first box and a second box. The first box and the second box are buckled together to form a closed space inside the box 20 to accommodate the battery cell assembly. The closed space here means covering or closing, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0088] As an example, the box body 20 may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body 20 to accommodate the battery cell assembly.

[0089] In some embodiments, the box 20 can be used as a part of the chassis structure of the vehicle. For example, part of the box 20 can become at least a part of the floor of the vehicle, or part of the box can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0090] According to some embodiments of the present application, referring to Figure 2 , and please refer to Figure 4The present application provides a battery device, which includes: a box body 20, an explosion-proof valve 10 and at least one battery cell assembly. The battery cell assembly is accommodated in the box body 20; the explosion-proof valve 10 is installed in the box body 20. The explosion-proof valve 10 includes: a valve body 11, a valve cover 12, a sealing membrane 13, a piston 14 and an elastic member 16. The valve body 11 forms a pressure relief channel 111 and a pressure relief port 112; the valve cover 12 is installed on the valve body 11; the sealing membrane 13 is installed between the valve body 11 and the valve cover 12, the sealing membrane 13 is used to separate the pressure relief channel 111 and the pressure relief port 112, and the sealing membrane 13 includes a first section 131, a second section 132 and a sealing section 133 connected in sequence, the first section 131 is connected to the valve body 11, and a cavity 101 connected to the pressure relief port 112 is formed between the second section 132 and the valve body 11, and the sealing section 133 is used to seal with the valve body 11; the sealing section 133 is clamped between the piston 14 and the valve body 11, and the piston 14 faces the pressure relief channel 111; the elastic member 16 abuts the valve cover 12, and the elastic member 16 is used to press the sealing section 133 toward the valve body 11 through the piston 14.

[0091] The valve body 11 can be made of metal or plastic, and the valve cover 12 can be made of metal or plastic.

[0092] Exemplarily, the valve body 11 and the valve cover 12 are both made of plastic material, such as polyetheretherketone, polytetrafluoroethylene or polyvinylidene fluoride.

[0093] Exemplarily, the valve body 11 and the valve cover 12 are both made of metal materials, such as cast iron, carbon steel or stainless steel.

[0094] like Figure 2-Figure 6 As shown, the valve body 11 serves as the main structure of the explosion-proof valve 10. A pressure relief channel 111 and a pressure relief port 112 are designed inside the valve body 11. The pressure relief channel 111 is the path through which the pressure medium needs to be guided to release under abnormally high pressure conditions, and the pressure relief port 112 is the outlet through which the pressure medium is finally released to the external environment. This design ensures that the pressure can be safely released within a controllable range. On the one hand, the design of the valve body 11 is more robust and can withstand higher pressure shocks. The pressure relief port 112 is arranged on the valve body 11, which helps to maintain the overall structural stability of the explosion-proof valve 10 and reduce deformation or damage of the valve cover 12 caused by pressure fluctuations. On the other hand, the pressure relief path is greatly shortened, making the pressure relief process simple and efficient, and achieving faster and more efficient explosion pressure relief. The valve cover 12 is installed on the valve body 11 to seal and protect the internal structure.

[0095] The number of the pressure relief ports 112 may be one or more, where more means two or more.

[0096] For example, in some embodiments, the number of the pressure relief ports 112 is set to 6.

[0097] like Figure 4-Figure 9 As shown, the sealing film 13 is a key component for the explosion-proof valve 10 to achieve pressure control, wherein the first section 131 can be connected to the valve body 11 by interference fit, bonding or clamping. Through the connection between the first section and the valve body 11, the shaking and displacement of the sealing film 13 in the sealed state are reduced, and the accuracy of the sealing film 13 resetting after the explosion pressure relief is improved, thereby comprehensively improving the stability of the sealing film 13. The high-pressure gas in the pressure relief channel 111 can first enter the cavity 101 formed between the second section 132 and the valve body 11, and then be discharged through the pressure relief port 112. The existence of the cavity 101 is equivalent to a pressure buffer zone, which can alleviate the impact force of the high-pressure gas to a certain extent, making the pressure relief process more stable and controllable, and reducing the impact force and destructive force caused by the sudden release of gas. The sealing section 133 is used to fit tightly with the valve body 11 to form an effective seal, thereby isolating the pressure relief channel 111 and the pressure relief port 112, and preventing the leakage of the medium under normal pressure. At the same time, the sealing film 13 also needs to be flexible enough to respond to pressure changes by deformation.

[0098] The sealing film 13 is usually made of elastic material, such as rubber, silicone or fluororubber.

[0099] For example, in some embodiments, the sealing membrane 13 is made of rubber.

[0100] like Figure 2 and Figure 4-Figure 5 As shown, the piston 14 cooperates with the sealing section 133 of the sealing membrane 13, and the sealing state of the sealing membrane 13 is affected by the change in the position of the piston 14. When the internal pressure of the system exceeds the set value, the piston 14 will move under the pressure, thereby changing the sealing effect of the sealing membrane 13 and allowing the pressure medium to be released through the pressure relief channel 111 and the pressure relief port 112; the elastic member 16 abuts between the valve cover 12 and the piston 14, providing the piston 14 with a force to press the sealing section 133 in the direction of the pressure relief channel 111. The selection of the elastic member 16 needs to consider the matching of its elastic force and the system working pressure to ensure that the sealing membrane 13 can maintain good sealing performance under normal working pressure; and when the pressure rises abnormally, the piston 14 can be allowed to overcome the elastic force and move to achieve timely pressure relief.

[0101] Specifically, the elastic member 16 may include but is not limited to a spring, an elastic rubber sleeve or an elastic air cushion, etc., which is not limited here.

[0102] For example, in some embodiments, Figure 2 and Figure 4-Figure 5 As shown, the elastic member 16 is a spring.

[0103] In some embodiments, the main body portion of the piston 14 may be cylindrical.

[0104] The piston 14 can be made of plastic or metal.

[0105] Exemplarily, the piston 14 is made of a plastic material, such as polytetrafluoroethylene, nitrile rubber or fluororubber.

[0106] Exemplarily, the piston 14 is made of metal material, such as aluminum alloy, cast iron or steel alloy.

[0107] In the related art, although some explosion-proof valves can also achieve the function of one-way ventilation, most of them only rely on pistons for sealing. The contact surface quality between the piston and the valve body is relatively average, and the piston is severely worn after long-term use, resulting in poor sealing performance of the explosion-proof valve, so that the one-way ventilation effect does not meet expectations.

[0108] In actual implementation, Figure 4-Figure 5 As shown, when the gas pressure inside the box body 20 is less than the opening pressure value set by the explosion-proof valve 10, the explosion-proof valve 10 is in a normal working state. In the normal working state, the elastic member 16 is elastically compressed between the valve cover 12 and the piston 14, so that the piston 14 presses the sealing film 13 toward the pressure relief channel 111 under the action of the elastic force, and the sealing film 13 fits tightly with the valve body 11. The gas in the pressure relief channel 111 cannot be discharged to the external environment due to the blocking effect of the sealing film 13 and the piston 14; when the gas pressure inside the box body 20 is greater than or equal to the opening pressure value set by the explosion-proof valve 10, the explosion-proof valve 10 is in an explosion pressure relief state. In the explosion pressure relief state, the high-pressure gas is discharged outward. The sealing section 133 and the piston 14 are squeezed, the sealing membrane 13 is deformed, and the piston 14 moves toward the valve cover 12, further compressing the elastic member 16 to shrink its length. At this time, a gap appears between the sealing membrane 13 and the valve body 11, so that the pressure relief channel 111 and the cavity 101 are connected, and the high-pressure gas then enters the cavity 101 through the above gap, and is finally discharged to the outside through the pressure relief port 112 connected to the cavity 101. As the gas is continuously released, the pressure inside the battery device gradually decreases until it reaches equilibrium with the external environment. At this time, the piston 14 begins to reset under the action of the elastic member 16, and the sealing membrane 13 fits with the valve body 11 again, restoring the sealing state under normal conditions.

[0109] It should be noted that the size of the pressure relief channel 111 can be designed according to the scale of the battery device and actual conditions, thereby determining the flow rate during the gas release.

[0110] The battery device provided in the embodiment of the present application, through the cooperation between the above-mentioned elastic member 16, the piston 14 and the sealing film 13, on the one hand, the box body 20 can release pressure from the inside to the outside through the explosion-proof valve 10, and air cannot enter from the outside to the inside, thereby realizing the one-way ventilation function of the explosion-proof valve 10; on the other hand, the piston 14 and the sealing film 13 are closely cooperated to seal the pressure relief channel 111, thereby optimizing the sealing performance of the explosion-proof valve in a natural state, greatly reducing the frequency and total amount of gas exchange between the inside of the box body 20 and the outside, and reducing the generation of condensed water inside the box body 20, thereby improving the reliability of the battery device, and then improving the reliability of the energy storage device; on the other hand, through the connection between the first section and the valve body 11, the shaking and deviation of the sealing film 13 in the sealed state are reduced, and the accuracy of the sealing film 13 resetting after the explosion pressure relief is improved, thereby comprehensively improving the stability of the sealing film 13; on the other hand, by setting the cavity 101, the pressure relief process is made smoother and more controllable, and the impact force and destructive force caused by the sudden release of gas are reduced.

[0111] According to some embodiments of the present application, Figure 4 and Figure 7-Figure 9 As shown, the sealing section 133 includes a main section 1331 and at least one rib 1332 connected to a side of the main section 1331 facing away from the valve cover 12 . The rib 1332 is arranged around the outlet of the pressure relief channel 111 , and the rib 1332 stops at the valve body 11 .

[0112] For example, in some embodiments, Figure 7-Figure 8 As shown, the sealing section 133 includes a rib 1332 .

[0113] For example, in some other embodiments, Fig. 9 As shown, the sealing segment 133 includes two ribs 1332 .

[0114] like Figure 4 and Figure 7-Figure 9 As shown, the radial thickness of the rib 1332 gradually decreases from the end connected to the main section 1331 to the end abutting the valve body 11, and the rib 1332 is arranged in a circular ring around the outlet of the pressure relief channel 111, and when the explosion-proof valve 10 is assembled, the rib 1332 is arranged in a compressed state between the main section 1331 and the valve body 11 to achieve circumferential sealing of the outlet of the pressure relief channel 111.

[0115] The battery device provided in the embodiment of the present application is configured to include a main body section 1331 and at least one rib 1332 through the above-mentioned configuration of the sealing section 133. On the one hand, the configuration of the rib 1332 strengthens the structure of the sealing section 133, so that the sealing section 133 can better resist the gas pressure and reduce the risk of leakage caused by pressure. On the other hand, the rib 1332 is configured to surround the outlet of the pressure relief channel 111 and abut against the valve body 11, forming a tighter sealing surface, further reducing the amount of condensed water generated inside the battery device, thereby improving the reliability of the battery device. On the other hand, the presence of the rib 1332 can reduce the direct contact area between the main body section 1331 and the valve body 11, thereby reducing friction and wear and extending the service life of the sealing membrane 13.

[0116] According to some embodiments of the present application, Figure 7 As shown, in the natural state, the inner diameter of the rib 1332 gradually increases from the end connected to the main section 1331 to the end abutting the valve body 11, and the angle between the inner wall of the rib 1332 and the main section 1331 is an obtuse angle, and the angle between the outer wall of the rib 1332 and the main section 1331 is an acute angle.

[0117] In this embodiment, if Figure 7 As shown, taking the plane on the side of the main body section 1331 away from the valve cover 12 as the projection plane, the positive projection of the end of the rib 1332 away from the main body section 1331 on the projection plane surrounds the outside of the center line of the other end of the rib 1332, that is, the rib 1332 can be tilted outward in a trumpet shape. Specifically, the inclination angle of the rib 1332 can be 30°, 45°, 60° or other acute angles, etc., which is not limited here.

[0118] It should be noted that the natural state is a state in which the sealing film 13 has no visible deformation. In other words, after the sealing film 13 is removed from the explosion-proof valve 10, the sealing film 13 recovers to a state in which it no longer deforms, which is the natural state.

[0119] The battery device provided in the embodiment of the present application, through the shape design of the above-mentioned rib 1332, the trumpet-shaped design enables the rib 1332 to form a wider and tighter contact surface when contacting the valve body 11. On the one hand, this contact surface not only increases the sealing area, but also improves the uniformity of the seal, thereby reducing the risk of leakage and further optimizing the sealing effect. On the other hand, it enhances the overall supporting effect of the sealing section 133, so that it can better resist the influence of external pressure and vibration, which helps to maintain the sealing effect while extending the service life of the sealing membrane 13.

[0120] According to some embodiments of the present application, Fig. 9 As shown, the sealing segment 133 includes a plurality of ribs 1332 disposed at intervals, and the plurality of ribs 1332 are concentrically disposed.

[0121] For example, in some embodiments, the sealing section 133 includes two ribs 1332 disposed at intervals, and the two ribs 1332 are both in a circular ring shape, wherein one rib 1332 surrounds the outside of the other rib 1332, and the centers of curvature of the two ribs 1332 coincide.

[0122] For example, in some other embodiments, the sealing segment 133 includes three ribs 1332 that are spaced apart from each other, and the three ribs 1332 are concentrically arranged.

[0123] The battery device provided in the embodiment of the present application has a structural design in which the above-mentioned multiple ribs 1332 are concentrically arranged. On the one hand, the multiple ribs 1332 form a multi-layer protection structure. When a layer of ribs 1332 is subjected to pressure or wear, the other ribs 1332 can still maintain the sealing effect, thereby improving the reliability and durability of the overall seal; on the other hand, the multiple ribs 1332 arranged concentrically can more effectively block the path of gas leakage. Even if a small leakage occurs at a certain point, it will be blocked by other ribs 1332, thereby reducing the risk of leakage; on the other hand, the multiple ribs 1332 are arranged at intervals to disperse the pressure acting on the sealing section 133 to each rib 1332, thereby reducing the pressure load borne by a single rib 1332 and improving the strength of the overall structure.

[0124] According to some embodiments of the present application, Figure 7-Figure 9 As shown, the first section 131 is closer to the valve cover 12 than the sealing section 133 , and the second section 132 is arranged inclined.

[0125] In this embodiment, if Figure 7-Figure 9 As shown, the first section 131 is folded relative to the second section 132 toward the direction close to the pressure relief channel 111, and the lower surface of the first section 131 is arc-shaped to facilitate installation on the valve body 11; the second section 132 is inclined from the inside to the outside toward the direction close to the valve cover 12, and the thickness of the second section 132 is much smaller than that of the first section 131, thereby providing a larger deformation space; the sealing section 133, as an important part of the sealing membrane 13, plays the role of sealing the pressure relief channel 111.

[0126] In some embodiments, the second section 132 is tilted toward the valve cover 12 at the same inclination angle from the inner end to the outer end.

[0127] In other embodiments, the second section 132 extends obliquely from the inner end to the outer end in a direction close to the valve cover 12 as a whole, but may have other extension directions or different inclination angles locally, for example, a local upper part of the area may extend radially, or different areas may have different inclination angles.

[0128] The battery device provided in the embodiment of the present application has the structural design of the first section 131, the second section 132 and the sealing section 133. On the one hand, the inclined design of the second section 132 enables the second section 132 to deform more easily when subjected to pressure, thereby absorbing and dispersing the pressure, protecting the sealing film 13 from excessive stress, thereby improving the durability and stability of the sealing film 13; on the other hand, the sealing section 133, as the core part of the sealing film 13, is directly involved in the process of sealing the pressure relief channel 111, and can maintain the reliability and durability of the seal under normal conditions, thereby reducing gas leakage.

[0129] According to some embodiments of the present application, Figure 7-Figure 9 As shown, the second section 132 forms an opening 1321 , and the width of the opening 1321 gradually increases from an end close to the pressure relief channel 111 to an end away from the pressure relief channel 111 .

[0130] In this embodiment, if Figure 7-Figure 9 As shown, the second section 132 is designed to be umbrella-shaped, and the opening 1321 is designed to be trumpet-shaped. Specifically, the expanded part of the opening 1321 is arranged close to the valve cover 12, and the closed part of the opening 1321 is arranged close to the pressure relief channel 111. When the space of the opening 1321 is sufficient for pressure relief, the sealing membrane 13 is fully deformed, thereby guiding the formation of a gap between the sealing membrane 13 and the valve body 11.

[0131] In other embodiments, the width of the opening 1321 remains constant from one end close to the pressure relief channel 111 to one end away from the pressure relief channel 111 .

[0132] The battery device provided in the embodiment of the present application provides a larger deformation space for the sealing membrane 13 by designing the opening 1321 formed by the second section 132 to be in the shape of a trumpet. In the explosion pressure relief state, the sealing membrane 13 can be deformed more easily to adapt to the pressure change, thereby reducing the self-stress of the sealing membrane 13 and further extending the service life of the sealing membrane 13.

[0133] According to some embodiments of the present application, Figure 7-Figure 9 As shown, the vertical cross-section of the second section 132 includes a plurality of arc segments, and the centers of curvature of two adjacent arc segments are located on two sides of the second section 132 respectively.

[0134] It is understandable that if Figure 7-Figure 9 As shown, the vertical cross-section of the second section 132 is designed to be wavy. This design makes the expansion area of ​​the second section 132 larger. Under the blasting pressure relief state, the sealing membrane 13 will deform upward, and the second section 132 with a larger expansion area greatly increases the space for upward deformation, which accelerates the gas discharge speed under the blasting pressure relief state and can better disperse and resist the gas impact force, thereby improving the overall stiffness and stability of the sealing membrane 13.

[0135] The battery device provided in the embodiment of the present application increases the expansion area of ​​the second section 132 by designing the vertical cross-section of the second section 132 to be wavy, leaving a larger margin for upward deformation for the sealing membrane 13, thereby accelerating the gas discharge speed under the explosion pressure relief state and better dispersing and resisting the gas impact force, thereby improving the overall stiffness and stability of the sealing membrane 13.

[0136] According to some embodiments of the present application, Figure 2 , Figure 4-Figure 5 and Figure 7-Figure 9 As shown, a first installation groove 113 is defined on one side of the valve body 11 close to the valve cover 12 , the first section 131 is installed in the first installation groove 113 , and the first section 131 is elastically compressed between the valve cover 12 and the valve body 11 .

[0137] In this embodiment, if Figure 2 , Figure 4-Figure 5 and Figure 7-Figure 9 As shown, the slot of the first mounting slot 113 faces the valve cover 12, and the height of the outer wall of the first mounting slot 113 is higher than the height of the inner wall of the first mounting slot 113 to avoid the portion of the second section 132 connected to the first section 131, and the first section 131 is installed in the first mounting slot 113 in a compressed state.

[0138] The battery device provided in the embodiment of the present application, through the setting of the above-mentioned first installation groove 113, on the one hand, provides clear positioning and guidance for the installation of the first section 131, making the installation process of the sealing membrane 13 simpler and faster, and on the other hand, the first section 131 is elastically compressed between the valve cover 12 and the valve body 11, and can form a tight sealing interface, effectively reducing gas leakage. When the explosion-proof valve 10 is closed, the gas cannot flow out through the gap between the valve cover 12 and the valve body 11.

[0139] According to some embodiments of the present application, Figure 2 , Figure 4 and Figure 6-Figure 9 As shown, the sealing membrane 13 further includes a limiting boss 134 , a limiting groove 135 is defined between the limiting boss 134 and the sealing section 133 , and at least a portion of the piston 14 is installed in the limiting groove 135 .

[0140] In this embodiment, if Figure 2 and Figure 4As shown, the limiting boss 134 is in the shape of a ring, and the axial direction of the limiting boss 134 is parallel to the vertical direction. The limiting boss 134 surrounds the sealing section 133 to form a limiting groove 135. The peripheral portion of the piston 14 can be installed in the limiting groove 135, and the sealing section 133 is also in the shape of a ring, and the axial direction of the sealing section 133 is also parallel to the vertical direction. In other words, the hollow area of ​​the sealing section 133 cooperates with at least part of the piston 14. Specifically, the piston 14 includes a connected plug head 142 and a plug core 143. The plug core 143 protrudes toward the pressure relief channel 111 relative to the plug head 142. The plug core 143 fills the hollow area of ​​the sealing section 133, so that a tight fit is formed between the sealing membrane 13 and the piston 14, thereby reducing the gas leaking out from the gap between the sealing membrane 13 and the piston 14.

[0141] The battery device provided in the embodiment of the present application, through the arrangement of the above-mentioned limiting boss 134 and the limiting groove 135, on the one hand, the limiting groove 135 jointly formed by the limiting boss 134 and the sealing section 133 provides a precise installation position for the piston 14, reducing the displacement and shaking of the piston 14 in the horizontal direction, thereby improving the reliability of the seal, and on the other hand, the contact between the sealing membrane 13 and the piston 14 is closer, reducing the risk of leakage caused by excessive gap. When the piston 14 needs to be replaced or repaired, due to the guiding effect of the limiting boss 134 and the limiting groove 135, the piston 14 can be more easily removed from the sealing membrane 13 or installed in place, reducing the complexity and cost of maintenance, and on the other hand, reducing the friction and wear between the piston 14 and the sealing membrane 13. The design of the limiting boss 134 and the limiting groove 135 helps to extend the service life of the sealing membrane 13 and the piston 14.

[0142] According to some embodiments of the present application, Figure 4 As shown, a positioning groove 1421 is provided on the wall surface of the plug head 142 facing away from the plug core 143 .

[0143] The shape of the positioning groove 1421 may include but is not limited to a circle, a square or other polygons, etc., which is not limited here.

[0144] Exemplarily, the positioning groove 1421 is circular and is located in the middle area of ​​the wall surface of the plug head 142 on the side facing away from the plug core 143 .

[0145] It can be understood that, on the one hand, the positioning groove 1421 allows specific tools to cooperate with the piston 14 to provide better torque transmission and precise control; on the other hand, the positioning groove 1421 can serve as a visual indicator to help users identify the direction or state of the piston 14; on the other hand, the positioning groove 1421 helps to reduce stress concentration points and extend the service life of the piston 14; on the other hand, the positioning groove 1421 can increase the friction coefficient of the surface of the plug head 142, making it less likely to slip when twisting.

[0146] According to some embodiments of the present application, Figure 4 As shown, the surface on the piston 14 for abutting against the sealing segment 133 and one of the surfaces on the sealing segment 133 for abutting against the piston 14 are serrated.

[0147] In some embodiments, the surface of the piston 14 for contacting with the sealing segment 133 is serrated.

[0148] In other embodiments, the surface of the sealing segment 133 for contacting the piston 14 is serrated.

[0149] It can be understood that the serrated contact surface forms a labyrinth sealing structure between the piston 14 and the sealing section 133. The principle of labyrinth sealing is to consume the energy of the fluid and reduce leakage through complex channels and tortuous paths. Therefore, this structure can increase the resistance and path length of the gas passing through, thereby significantly improving the sealing performance; the serrated contact surface design can increase the contact area and contact point between the piston 14 and the sealing section 133, making the contact between the piston 14 and the sealing section 133 closer and more stable. This close contact helps to reduce the risk of leakage caused by excessive gaps; the serrated contact surface design can disperse the contact stress between the piston 14 and the sealing section 133 and reduce the pressure load per unit area. This stress dispersion effect helps to reduce the wear rate of the contact surface and extend the service life of the sealing membrane 13 and the piston 14.

[0150] The battery device provided in the embodiment of the present application designs the contact surface between the piston 14 and the sealing section 133 to be serrated, which can increase the resistance and path length of gas passing through, thereby significantly improving the sealing performance, and on the other hand, increase the contact area and contact points between the piston 14 and the sealing section 133, so that the contact between the piston 14 and the sealing section 133 is tighter and more stable, thereby helping to reduce the risk of leakage caused by excessive gap, and on the other hand, disperse the contact stress between the piston 14 and the sealing section 133, reducing the pressure load per unit area, thereby helping to reduce the wear rate of the contact surface, thereby extending the service life of the sealing film 13 and the piston 14.

[0151] According to some embodiments of the present application, Figure 2 , Figure 4 and Figure 6 As shown, the sealing membrane 13 further includes an extension portion 136 , which extends from the limiting boss 134 toward the center of the valve body 11 so that the extension portion 136 , the limiting boss 134 and the sealing section 133 wrap around the edge of the piston 14 .

[0152] In this embodiment, if Figure 2 , Figure 4 and Figure 6As shown, the extension portion 136 is in a circular shape, the outer peripheral wall of the extension portion 136 is connected to the inner peripheral wall of the limiting boss 134, and the extension portion 136 and the limiting boss 134 are substantially at a right angle, the limiting boss 134 and the sealing section 133 are substantially at a right angle, the extension portion 136 and the sealing section 133 are spaced apart and distributed in the vertical direction, and when the sealing membrane 13 is assembled, the extension portion 136 is attached to the wall surface of the sealing membrane 13 on the side away from the pressure relief channel 111, the limiting boss 134 is attached to the outer peripheral wall of the sealing membrane 13, and the sealing section 133 is attached to the wall surface of the sealing membrane 13 on the side close to the pressure relief channel 111.

[0153] The battery device provided in the embodiment of the present application, through the arrangement of the above-mentioned extension portion 136, realizes that the extension portion 136, the limiting boss 134 and the sealing section 133 wrap the edge of the piston 14. On the one hand, the extension portion 136 can assist the elastic member 16 to further limit the displacement and shaking of the piston 14 in the vertical direction, thereby maximizing the reliability of the seal. On the other hand, it helps to reduce the friction and wear between the piston 14 and the sealing membrane 13, thereby extending the service life of the sealing membrane 13 and the piston 14.

[0154] According to some embodiments of the present application, Figure 4-Figure 5 As shown, the elastic member 16 is elastically compressed between the valve cover 12 and the extension portion 136 .

[0155] In actual implementation, Figure 4-Figure 5 As shown, under normal working conditions, the elastic member 16 is installed in a compressed state between the valve cover 12 and the sealing membrane 13, that is, the elastic member 16 applies downward pressure to the sealing membrane 13 for a long time. Specifically, based on the end of the elastic member 16 facing away from the valve cover 12, it stops at the limiting boss 134, and the elastic member 16 applies downward pressure to the extension portion 136, so that at least part of the piston 14 installed in the limiting groove 135 also presses the sealing section 133 downward when subjected to this pressure. Therefore, under the action of the elastic force, the extension portion 136, the peripheral portion of the piston 14 and the sealing section 133 are tightly pressed together in the vertical direction, and the sealing section 133 is in a compressed state and presses against the edge of the outlet of the pressure relief channel 111, thereby improving the sealing of the outlet of the pressure relief channel 111 by the sealing section 133.

[0156] It should be noted that the elastic force of the elastic member 16 can adjust parameters according to different working conditions and adjust the elastic force according to the internal pressure to meet various needs. Specifically, taking the elastic member 16 as a spring as an example, springs with different stiffness coefficients can be selected according to the opening pressure value set by the explosion-proof valve 10.

[0157] The battery device provided in the embodiment of the present application sets the elastic member 16 to abut against the extension portion 136. On the one hand, compared with the design of abutting against the piston 14, the area of ​​action of the elastic force is concentrated on the peripheral portion of the piston 14, thereby reducing the probability of the piston 14 blocking the pressure relief channel 111, thereby improving the safety performance of the explosion-proof valve 10. On the other hand, the elastic member 16 provides pressure for the sealing membrane 13 to enhance the sealing effect, which helps to reduce the accidental opening and cause the explosion of the explosion-proof valve 10. On the other hand, the elastic force of the elastic member 16 can adjust parameters according to different working conditions and adjust the elastic force according to the internal pressure to adapt to various needs, thereby increasing the diversity and flexibility of the explosion-proof valve 10.

[0158] According to some embodiments of the present application, Figure 2 , Figure 4 and Figure 6 As shown, the piston 14 includes a protrusion 141 protruding toward the direction close to the valve cover 12, and a second installation groove 15 is formed between the protrusion 141, the limiting boss 134 and the extension portion 136. The end of the elastic member 16 facing away from the valve cover 12 abuts against the bottom wall of the second installation groove 15.

[0159] In this embodiment, if Figure 4 As shown, the protrusion 141 can be annular, the above-mentioned first mounting groove 113 surrounds the outer side of the second mounting groove 15, and the extension portion 136 and the protrusion 141 can be concentrically arranged, the top surface height of the extension portion 136 can be greater than the top surface height of the protrusion 141, the extension portion 136 and the protrusion 141 are spaced apart and distributed in the horizontal direction, the limiting boss 134 can be arranged between the extension portion 136 and the protrusion 141 to form the second mounting groove 15, the end of the elastic member 16 away from the valve cover 12 is installed in the second mounting groove 15, and the first mounting groove 113 is located on the side of the second mounting groove 15 away from the pressure relief channel 111, and the middle part of the valve cover 12 can be recessed inward to form a short column structure, the short column structure is separated from the extension portion 136 and the protrusion 141, and the end of the elastic member 16 close to the valve cover 12 can be sleeved on the short column structure.

[0160] The battery device provided in the embodiment of the present application, through the arrangement of the above-mentioned protrusion 141 and the second mounting groove 15, on the one hand, the second mounting groove 15 provides a precise mounting position for the elastic member 16, ensuring that the elastic member 16 can accurately abut against the limiting boss 134, thereby maintaining a stable sealing effect, and on the other hand, in conjunction with the guiding effect of the short column structure on the valve cover 12, the deformation direction of the elastic member 16 is limited, reducing the probability of displacement or falling off of the elastic member 16, thereby improving the overall stability and reliability of the explosion-proof valve 10, and on the other hand, by changing the depth of the second mounting groove 15, the compression stroke of the elastic member 16 can be limited, which helps to reduce damage or failure of the elastic member 16 caused by excessive compression, thereby protecting the entire sealing system and extending the service life of the explosion-proof valve 10. According to some embodiments of the present application, such as Figure 2-Figure 4 and Figure 6 As shown, the valve cover 12 is provided with a plurality of buckles 121 spaced apart and distributed along the circumferential direction, and the valve body 11 is provided with a plurality of slots 116 corresponding to and engaging with the plurality of buckles 121 one by one.

[0161] A plurality means two or more than two. For example, in some embodiments, the valve cover 12 is provided with four clips 121 spaced apart along the circumferential direction, and the valve body 11 is provided with four slots 116 corresponding to and snap-fitting with the multiple clips 121 one by one.

[0162] like Figure 2-Figure 4 and Figure 6 As shown, the buckle 121 is protruding downward, and the slot 116 is located between two adjacent pressure relief ports 112, that is, multiple slots 116 and multiple pressure relief ports 112 are staggered along the circumferential direction. The buckle 121 and the slot 116 are snap-connected and fixed to achieve assembly and fixation between the valve body 11 and the valve cover 12, so that the bonding force between the valve body 11 and the valve cover 12 is sufficient to withstand the elastic force of the elastic member 16.

[0163] The battery device provided in the embodiment of the present application, through the arrangement of the above-mentioned multiple buckles 121 and multiple slots 116, on the one hand, forms a stable connection structure between the valve cover 12 and the valve body 11, which can withstand greater pressure and vibration and maintain the normal operation of the explosion-proof valve 10, and the valve cover 12 and the valve body 11 can be accurately positioned when connected, so that the relative position between the two is accurate. On the other hand, the installation process of the valve cover 12 becomes simple and quick, without the need for complicated tools and a large number of fasteners, thereby reducing the difficulty and cost of installation. When the valve cover 12 needs to be repaired or replaced, it is only necessary to simply detach the buckle 121 from the slot 116, thereby improving the convenience of maintenance.

[0164] According to some embodiments of the present application, Figure 2-Figure 5 As shown, the explosion-proof valve 10 further includes a nut 17 and a first sealing member 18 .

[0165] like Figure 5-Figure 6As shown, the nut 17 is threadedly connected to the outer surface of the valve body 11 , and the valve body 11 defines a third installation groove 114 for installing the first seal 18 , the third installation groove 114 faces the nut 17 , and a gap for clamping the box body 20 is formed between the nut 17 and the first seal 18 .

[0166] In this embodiment, if Figure 5 As shown, when the explosion-proof valve 10 is assembled in the box body 20, the first seal 18 is installed in the third installation groove 114 in a compressed state. Specifically, the first seal 18 is elastically compressed between the valve body 11 and the box body 20, and the first seal 18 and the box body 20 are clamped between the valve body 11 and the nut 17. The nut 17 is sleeved on the outer surface of the valve body 11, and the nut 17 is located inside the box body 20. The nut 17 abuts against the inner wall surface of the box body 20 as a fastener.

[0167] The battery device provided in the embodiment of the present application, through the arrangement of the above-mentioned nut 17 and the first seal 18, on the one hand, the nut 17 is threadedly connected to the outer surface of the valve body 11, so that the first seal 18 can be tightly clamped between the valve body 11 and the box body 20 of the battery device to form a sealed interface. This clamping effect can effectively reduce the leakage of gas from the gap between the box body 20 and the valve body 11, thereby improving the overall sealing performance. On the other hand, the third installation groove 114 specially set on the valve body 11 faces the nut 17, which not only provides a clear position and direction for the installation of the first seal 18, but also enables the first seal 18 to be more evenly stressed when being pressed by the nut 17, thereby further improving the sealing effect.

[0168] According to some embodiments of the present application, Figure 2-Figure 5 As shown, the explosion-proof valve 10 further includes a second sealing member 19 .

[0169] like Figure 5-Figure 6 As shown, a fourth mounting groove 115 is formed on the outer periphery of the valve body 11 , and the second sealing member 19 is mounted in the fourth mounting groove 115 .

[0170] In actual implementation, when testing the air tightness of the box body 20, place the plug 4 at the corresponding position of the box body 20 so that the plug 4 corresponds to the second seal 19, pay attention to the direction and position of the plug 4, ensure that it can be correctly inserted and form a seal with the second seal 19, use appropriate tooling to apply a certain pressure to the plug 4 so that it is in close contact with the second seal 19 and form an effective sealing interface, while applying pressure, pay attention to whether there is gas or liquid leaking from the sealing interface. If there is leakage, stop applying pressure immediately and check the installation of the second seal 19 and the plug 4. After the plug 4 is assembled, connect the airtightness tester to the corresponding interface on the box 20 to ensure that there is no leakage at the connection. Turn on the power switch of the airtightness tester, and set the inflation time, pressure holding time and other parameters according to the test requirements. Start the airtightness tester for testing. The tester will fill a certain amount of detection gas into the box 20 and monitor the changes in the gas pressure inside the box 20. During the test, pay attention to the display screen or indicator light of the airtightness tester and other indication information to understand the test results in time, and judge whether the airtightness of the box 20 meets the requirements based on the test results of the airtightness tester. If the test results show that the gas pressure inside the box 20 remains stable within the specified time and no leakage occurs, it means that the airtightness of the box 20 is good. Otherwise, it means that there is a leakage problem and it needs to be repaired or replaced.

[0171] The battery device provided in the embodiment of the present application, through the arrangement of the above-mentioned second seal 19, on the one hand, the second seal 19 is installed in the fourth installation groove 115 of the valve body 11, and is specially designed for air-tightness testing. When it is necessary to perform an air-tightness test on the box body 20, it is only necessary to match the plug 4 with the second seal 19 to quickly and easily establish a closed test environment. On the other hand, through the special sealing structure and matching method, the risk of leakage during the air-tightness test can be more effectively reduced, thereby improving the accuracy and reliability of the air-tightness test.

[0172] According to some embodiments of the present application, the valve body 11 , the valve cover 12 , the sealing membrane 13 and the piston 14 are all plastic parts.

[0173] In the battery device provided in the embodiment of the present application, except for the elastic member 16 which is made of metal material, the valve body 11, the valve cover 12, the sealing membrane 13 and the piston 14 are all made of plastic material. On the one hand, under the premise of maintaining the functions and performances, the cost of plastic materials is lower than that of metal materials, and plastic parts can be mass-produced through efficient production processes such as injection molding, which helps to reduce material costs and processing costs, and is conducive to promotion and mass production. On the other hand, plastic materials are lighter in weight than traditional metal materials, thereby achieving the overall lightweight of the explosion-proof valve 10.

[0174] According to some embodiments of the present application, the present application further provides an explosion-proof valve 10 , including: a valve body 11 , a valve cover 12 , a sealing membrane 13 , a piston 14 and an elastic member 16 .

[0175] The valve body 11 forms a pressure relief channel 111 and a pressure relief port 112; the valve cover 12 is installed on the valve body 11; the sealing membrane 13 is installed between the valve body 11 and the valve cover 12, and is used to separate the pressure relief channel 111 and the pressure relief port 112, and the sealing membrane 13 includes a first section 131, a second section 132 and a sealing section 133 connected in sequence, the first section 131 is connected to the valve body 11, and a cavity 101 connected to the pressure relief port 112 is formed between the second section 132 and the valve body 11, and the sealing section 133 is used to seal with the valve body 11; the piston 14 is arranged in the valve body 11, and the sealing section 133 is clamped between the piston 14 and the valve body 11, and the piston 14 faces the pressure relief channel 111; one end of the elastic member 16 abuts against the valve cover 12, and the other end of the elastic member 16 presses the sealing section toward the valve body 11 by pressing the piston 14.

[0176] The explosion-proof valve 10 provided in the embodiment of the present application, through the cooperation between the elastic member 16, the piston 14 and the sealing membrane 13, on the one hand, the box body 20 can release pressure from the inside to the outside through the explosion-proof valve 10, and air cannot enter from the outside to the inside, thereby realizing the one-way ventilation function of the explosion-proof valve 10; on the other hand, the piston 14 and the sealing membrane 13 are closely cooperated to seal the pressure relief channel 111, thereby optimizing the sealing performance of the explosion-proof valve in a natural state, greatly reducing the frequency and total amount of gas exchange between the inside of the box body 20 and the outside, and reducing the generation of condensed water inside the box body 20, thereby improving the reliability of the battery device, and then improving the reliability of the energy storage device; on the other hand, through the connection between the first section and the valve body 11, the shaking and deviation of the sealing membrane 13 in the sealed state are reduced, and the accuracy of the resetting of the sealing membrane 13 after the explosion pressure relief is improved, thereby comprehensively improving the stability of the sealing membrane 13; on the other hand, by setting the cavity 101, the pressure relief process is made smoother and more controllable, and the impact force and destructive force caused by the sudden release of gas are reduced.

[0177] According to some embodiments of the present application, the present application also provides an energy storage device, including: any one of the battery devices described above.

[0178] The energy storage device provided in the embodiment of the present application, through the arrangement of the above-mentioned battery device, on the one hand, the box body 20 can release pressure from the inside to the outside through the explosion-proof valve 10, and air cannot enter from the outside to the inside, thereby realizing the one-way ventilation function of the explosion-proof valve 10; on the other hand, the piston 14 and the sealing film 13 are closely matched to seal the pressure relief channel 111, thereby optimizing the sealing performance of the explosion-proof valve in a natural state, greatly reducing the frequency and total amount of gas exchange between the inside of the box body 20 and the outside, and reducing the generation of condensed water inside the box body 20, thereby improving the reliability of the battery device, and then improving the reliability of the energy storage device; on the other hand, through the connection between the first section and the valve body 11, the shaking and deviation of the sealing film 13 in the sealed state are reduced, and the accuracy of the resetting of the sealing film 13 after the explosion pressure relief is improved, thereby comprehensively improving the stability of the sealing film 13; on the other hand, by setting the cavity 101, the pressure relief process is made smoother and more controllable, and the impact force and destructive force caused by the sudden release of gas are reduced.

[0179] According to some embodiments of the present application, the present application further provides an electrical device, including: a battery device as described above.

[0180] The electrical device provided in the embodiment of the present application, through the setting of the above-mentioned battery device, on the one hand, the box body 20 can release pressure from the inside to the outside through the explosion-proof valve 10, and air cannot enter from the outside to the inside, thereby realizing the one-way ventilation function of the explosion-proof valve 10; on the other hand, the piston 14 and the sealing membrane 13 are closely matched to seal the pressure relief channel 111, thereby optimizing the sealing performance of the explosion-proof valve in a natural state, greatly reducing the frequency and total amount of gas exchange between the inside of the box body 20 and the outside, and reducing the generation of condensed water inside the box body 20, thereby improving the reliability of the battery device, and then improving the reliability of the energy storage device; on the other hand, through the connection between the first section and the valve body 11, the shaking and deviation of the sealing membrane 13 in the sealed state are reduced, and the accuracy of the resetting of the sealing membrane 13 after the explosion pressure relief is improved, thereby comprehensively improving the stability of the sealing membrane 13; on the other hand, by setting the cavity 101, the pressure relief process is made smoother and more controllable, and the impact force and destructive force caused by the sudden release of gas are reduced.

[0181] According to some embodiments of the present application, see Figure 2-Figure 9As shown, the present application provides a battery device, comprising: a box body 20, an explosion-proof valve 10 and at least one battery cell assembly, the battery cell assembly is accommodated in the box body 20; the explosion-proof valve 10 is installed in the box body 20, wherein the explosion-proof valve 10 comprises: a valve body 11, a valve cover 12, a sealing membrane 13, a piston 14 and an elastic member 16. The valve body 11 forms a pressure relief channel 111 and a pressure relief port 112; the valve cover 12 is installed on the valve body 11; the sealing membrane 13 is installed on the valve body 11, and is used to separate the pressure relief channel 111 and the pressure relief port 112, and the sealing membrane 13 includes a first section 131, a second section 132 and a sealing section 133 which are connected in sequence, the first section 131 is connected to the valve body 11, and a cavity 101 which is connected to the pressure relief port 112 is formed between the second section 132 and the valve body 11, and the sealing section 133 is used to seal with the valve body 11; the piston 14 is arranged in the valve body 11, and the sealing section 133 is clamped between the piston 14 and the valve body 11; one end of the elastic member 16 abuts against the valve cover 12, and the other end of the elastic member 16 presses the sealing section 133 toward the valve body 11 by pressing the piston 14. The sealing section 133 includes a main section 1331 and at least one rib 1332 connected to the side of the main section 1331 away from the valve cover 12. The rib 1332 is arranged around the outlet of the pressure relief channel 111 and stops at the valve body 11. In a natural state, the inner diameter of the rib 1332 gradually increases from the end connected to the main section 1331 to the end abutting against the valve body 11, and the angle between the inner side wall of the rib 1332 and the main section 1331 is an obtuse angle, and the angle between the outer side wall of the rib 1332 and the main section 1331 is an acute angle. The sealing section 133 includes a plurality of ribs 1332 arranged at intervals, and the plurality of ribs 1332 are arranged concentrically. The first section 131 is closer to the valve cover 12 than the sealing section 133, and the second section 132 is arranged obliquely. The second section 132 forms an opening 1321, and the width of the opening 1321 gradually increases from one end close to the pressure relief channel 111 to the end away from the pressure relief channel 111. The vertical cross-section of the second section 132 includes a plurality of arc segments, and the centers of curvature of two adjacent arc segments are respectively located on both sides of the second section 132. The first installation groove 113 is defined on one side of the valve body 11 close to the valve cover 12, and the first section 131 is installed in the first installation groove 113 and elastically compressed between the valve cover 12 and the valve body 11. The sealing membrane 13 also includes a limiting boss 134, which protrudes from the sealing section 133 toward the valve cover 12, and a limiting groove 135 is defined between the limiting boss 134 and the sealing section 133, and at least part of the piston 14 is installed in the limiting groove 135. The sealing membrane 13 further includes an extension portion 136, which extends from the limiting boss 134 toward the center of the valve body 11 so that the extension portion 136, the limiting boss 134 and the sealing section 133 wrap the edge of the piston 14. The elastic member 16 is elastically compressed between the valve cover 12 and the extension portion 136.The piston 14 includes a protrusion 141 protruding toward the direction close to the valve cover 12, and a second installation groove 15 is formed between the protrusion 141, the limiting boss 134 and the extension 136. The end of the elastic member 16 facing away from the valve cover 12 abuts against the bottom wall of the second installation groove 15. The valve cover 12 is provided with a plurality of buckles 121 spaced apart and distributed along the circumferential direction, and the valve body 11 is provided with a plurality of snap grooves 116 corresponding to and engaging with the plurality of buckles 121. The explosion-proof valve 10 also includes: a nut 17 and a first sealing member 18, the nut 17 is threadedly connected to the outer surface of the valve body 11, and the valve body 11 defines a third installation groove 114 for installing the first sealing member 18, the third installation groove 114 faces the nut 17, and a gap for clamping the box body 20 is formed between the nut 17 and the first sealing member 18. The explosion-proof valve 10 also includes: a second sealing member 19, and a fourth installation groove 115 is formed on the outer periphery of the valve body 11, and the second sealing member 19 is installed in the fourth installation groove 115. The valve body 11, the valve cover 12, the sealing membrane 13 and the piston 14 are all plastic parts.

[0182] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0183] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery device, characterized in that: include: Box; At least one battery cell assembly is contained in the box; An explosion-proof valve is installed on the box; wherein the explosion-proof valve comprises: The valve body forms a pressure relief passage and a pressure relief port; A valve cover, mounted on the valve body; A sealing membrane is installed on the valve body, used to separate the pressure relief channel and the pressure relief port, and includes a first section, a second section and a sealing section connected in sequence, the first section is connected to the valve body, a cavity connected to the pressure relief port is formed between the second section and the valve body, the first section is closer to the valve cover than the sealing section, the second section is inclined, and the sealing section is used to seal with the valve body; A piston is disposed in the valve body, and the sealing section is clamped between the piston and the valve body; an elastic member, one end of which abuts against the valve cover, and the other end of which presses the sealing section toward the valve body by pressing the piston; When the gas pressure inside the box is greater than or equal to the opening pressure value set for the explosion-proof valve, the piston moves toward the valve cover and the sealing film is deformed.

2. The battery device according to claim 1, characterized in that: The sealing section includes a main body section and at least one rib connected to a side of the main body section away from the valve cover, and the rib is arranged around the outlet of the pressure relief channel and stops at the valve body.

3. The battery device according to claim 2, characterized in that: In a natural state, the inner diameter of the rib gradually increases from the end connected to the main section to the end abutting the valve body, and the angle between the inner wall of the rib and the main section is an obtuse angle, while the angle between the outer wall of the rib and the main section is an acute angle.

4. The battery device according to claim 2, characterized in that: The sealing section includes a plurality of ribs arranged at intervals, and the plurality of ribs are arranged concentrically.

5. The battery device according to claim 1, characterized in that: The second section forms an opening, and the width of the opening gradually increases from an end close to the pressure relief channel to an end away from the pressure relief channel.

6. The battery device according to claim 1, characterized in that: The vertical cross-section of the second section includes a plurality of arc segments, and the centers of curvature of two adjacent arc segments are respectively located on two sides of the second section.

7. The battery device according to claim 1, characterized in that: A first mounting groove is defined on one side of the valve body close to the valve cover, and the first section is mounted in the first mounting groove and elastically compressed between the valve cover and the valve body.

8. The battery device according to claim 1, characterized in that: The sealing film further comprises a limiting boss, the limiting boss protrudes from the sealing section toward the valve cover, and a limiting groove is defined between the limiting boss and the sealing section, and at least a part of the piston is installed in the limiting groove.

9. The battery device according to claim 8, characterized in that: The sealing film further comprises an extension portion, and the extension portion extends from the limiting boss toward the center of the valve body so that the extension portion, the limiting boss and the sealing section wrap around the edge of the piston.

10. The battery device according to claim 9, characterized in that: The elastic member is elastically compressed between the valve cover and the extending portion.

11. The battery device according to claim 10, characterized in that: The piston comprises a protrusion protruding in a direction close to the valve cover, a second mounting groove is formed between the protrusion, the limiting boss and the extension portion, and one end of the elastic member facing away from the valve cover abuts against a bottom wall of the second mounting groove.

12. The battery device according to any one of claims 1 to 11, characterized in that: The valve cover is provided with a plurality of buckles which are spaced apart and distributed along the circumferential direction, and the valve body is provided with a plurality of clamping grooves which correspond to the plurality of buckles one by one and are clamped and matched.

13. The battery device according to any one of claims 1 to 11, characterized in that: The explosion-proof valve also includes: A nut and a first seal, wherein the nut is threadedly connected to the outer surface of the valve body, the valve body defines a third installation groove for installing the first seal, the third installation groove faces the nut, and a gap is formed between the nut and the first seal for clamping the box body.

14. The battery device according to any one of claims 1 to 11, characterized in that: The explosion-proof valve also includes: A second sealing member, a fourth mounting groove is formed on the outer periphery of the valve body, and the second sealing member is mounted in the fourth mounting groove.

15. The battery device according to any one of claims 1 to 11, characterized in that: The valve body, the valve cover, the sealing membrane and the piston are all plastic parts.

16. An explosion-proof valve, characterized in that: include: The valve body forms a pressure relief passage and a pressure relief port; A valve cover, mounted on the valve body; A sealing membrane is installed between the valve body and the valve cover, used to separate the pressure relief channel and the pressure relief port, and includes a first section, a second section and a sealing section connected in sequence, the first section is connected to the valve body, a cavity connected to the pressure relief port is formed between the second section and the valve body, the first section is closer to the valve cover than the sealing section, the second section is inclined, and the sealing section is used to seal with the valve body; A piston is disposed in the valve body, the sealing section is clamped between the piston and the valve body, and the piston faces the pressure relief passage; an elastic member, one end of which abuts against the valve cover, and the other end of which presses the sealing section toward the valve body by pressing the piston; When the gas pressure inside the box is greater than or equal to the opening pressure value set for the explosion-proof valve, the piston moves toward the valve cover and the sealing film is deformed.

17. An energy storage device, characterized in that: include: A battery device as claimed in any one of claims 1 to 15.

18. An electrical device, characterized in that: include: A battery device as claimed in any one of claims 1 to 15.

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