Explosion-proof valve, battery apparatus, energy storage device, and electric device

Abstract

A battery apparatus comprises: a case, an explosion-proof valve and at least one battery cell assembly. The explosion-proof valve comprises: a valve body defining a pressure relief channel and a pressure relief port; a valve cover mounted on the valve body; a sealing membrane mounted on the valve body, configured to isolate the pressure relief channel from the pressure relief port, and having a sealing section for sealing the valve body; a piston arranged in the valve body and facing the pressure relief channel, the sealing section being clamped between the piston and the valve body; and an elastic member abutting against the valve cover and configured to pressing the sealing section towards the valve body by pressing the piston. With the structure, the one-way ventilation function of the explosion-proof valve is realized, the sealing performance of the explosion-proof valve in a natural state is optimized, the frequency and the total amount of gas exchange between the interior of the case and the outside are reduced, condensed water generated inside the case is reduced, and the reliability of the battery apparatus is improved.

Description

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

[0001] Cross-reference to related applications

[0002] This application is based on and claims priority to Chinese Patent Application No. 202411183195.8, filed on August 27, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of battery technology, and more specifically, to an explosion-proof valve, a battery device, an energy storage device, and an electrical device. Background Technology

[0004] With the continuous upgrading of large-capacity battery cells, safety has become a key concern in the energy storage industry. Explosion-proof valves are crucial components for balancing the internal pressure of battery devices, protecting them from overcharging or over-discharging and preventing explosions. However, existing explosion-proof valves suffer from insufficient sealing performance and leakage under natural conditions, leading to frequent gas exchange between the battery device and the external environment. This reduces the reliability of the battery device and, consequently, the reliability of the energy storage system. Summary of the Invention

[0005] This 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.

[0006] In a first aspect, embodiments of this application provide a battery device, including:

[0007] Box;

[0008] At least one battery cell assembly is housed within the housing;

[0009] An explosion-proof valve, wherein the explosion-proof valve is installed in the enclosure; wherein the explosion-proof valve comprises:

[0010] The valve body forms a pressure relief channel and a pressure relief port;

[0011] Valve cover, installed on the valve body;

[0012] A sealing membrane, installed on the valve body, is used to isolate the pressure relief channel and the pressure relief port, and has a sealing section for sealing with the valve body;

[0013] A piston is disposed within the valve body, and the sealing section is sandwiched between the piston and the valve body;

[0014] An elastic element, 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.

[0015] In the above technical solution, through the cooperation between the elastic element, piston, and sealing membrane, on the one hand, the housing can release pressure from the inside to the outside through the explosion-proof valve, and prevent air from entering from the outside to the inside, thus realizing the one-way ventilation function of the explosion-proof valve. On the other hand, by using the piston and sealing membrane to seal the pressure relief channel in close cooperation, the sealing performance of the explosion-proof valve under natural conditions is optimized, which greatly reduces the frequency and total amount of gas exchange between the inside of the housing and the outside, reduces the generation of condensate inside the housing, thereby improving the reliability of the battery device and the reliability of the energy storage device. Furthermore, the reset function of the elastic element enables the explosion-proof valve to be reused, reducing the cost caused by damage or replacement after single use.

[0016] In some embodiments, a cavity is formed between the sealing membrane and the valve body, the pressure relief port communicates with the cavity, and the sealing section is used to isolate the pressure relief channel and the cavity.

[0017] In some embodiments, the piston is configured to move toward the valve cover when the gas pressure inside the housing is greater than or equal to the opening pressure value set by the explosion-proof valve, and the sealing membrane deforms.

[0018] In some embodiments, the sealing section includes a main body section and at least one rib connected to the side of the main body section opposite to the valve cover, the rib being disposed around the outlet of the pressure relief channel and abutting against the valve body.

[0019] In some embodiments, in the natural state, the inner diameter of the rib gradually increases from the end connected to the main body segment to the end abutting against the valve body, and the angle between the inner sidewall of the rib and the main body segment is an obtuse angle, while the angle between the outer sidewall of the rib and the main body segment is an acute angle.

[0020] In some embodiments, the sealing segment includes a plurality of spaced-apart ribs, the plurality of ribs being concentrically arranged.

[0021] In some embodiments, the sealing membrane includes a first segment, a second segment, and a sealing segment connected in sequence, the first segment being fixed to the valve body, the first segment being closer to the valve cover than the sealing segment, and the second segment being inclined.

[0022] In some embodiments, the second segment forms an opening, the width of which gradually increases from one end near the pressure relief channel to the end away from the pressure relief channel.

[0023] In some embodiments, the vertical cross-section of the second segment includes multiple arc segments, and the curvature centers of two adjacent arc segments are located on both sides of the second segment.

[0024] In some embodiments, a first mounting groove is defined on the side of the valve body near the valve cover, the first segment is mounted in the first mounting groove and is elastically compressed between the valve cover and the valve body.

[0025] In some embodiments, the sealing membrane further includes a limiting boss that protrudes from the sealing section toward the valve cover and defines a limiting groove between the limiting boss and the sealing section, wherein at least a portion of the piston is mounted in the limiting groove.

[0026] In some embodiments, the sealing membrane further includes an extension that extends from the limiting boss toward the center of the valve body such that the extension, the limiting boss, and the sealing section enclose the edge of the piston.

[0027] In some embodiments, the elastic element is elastically compressed between the valve cover and the extension.

[0028] In some embodiments, the piston includes a protrusion that protrudes toward the valve cover, a second mounting groove is formed between the protrusion, the limiting boss and the extension, and one end of the elastic member away from the valve cover abuts against the bottom wall of the second mounting groove.

[0029] In some embodiments, the valve cover is provided with a plurality of snaps spaced apart circumferentially, and the valve body is provided with a plurality of slots that correspond one-to-one with and engage with the plurality of snaps.

[0030] In some embodiments, the explosion-proof valve further includes:

[0031] A nut and a first seal are provided, the nut being threaded to the outer surface of the valve body, the valve body defining a third mounting groove for mounting the first seal, the third mounting groove facing the nut, and a gap being formed between the nut and the first seal for clamping the housing.

[0032] In some embodiments, the explosion-proof valve further includes:

[0033] The second seal is installed in the fourth mounting groove formed on the outer periphery of the valve body.

[0034] In some embodiments, the valve body, the valve cover, the sealing membrane, and the piston are all made of plastic.

[0035] Secondly, embodiments of this application provide an explosion-proof valve, comprising:

[0036] The valve body forms a pressure relief channel and a pressure relief port;

[0037] Valve cover, installed on the valve body;

[0038] A sealing membrane is installed between the valve body and the valve cover to isolate the pressure relief channel and the pressure relief port, and has a sealing section for sealing with the valve body;

[0039] A piston is disposed within the valve body, and the sealing section is sandwiched between the piston and the valve body, with the piston facing the pressure relief channel;

[0040] An elastic element, 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.

[0041] In the above technical solution, through the cooperation between the elastic element, piston, and sealing membrane, on the one hand, the housing can release pressure from the inside to the outside through the explosion-proof valve, and prevent air from entering from the outside to the inside, thus realizing the one-way ventilation function of the explosion-proof valve. On the other hand, by using the piston and sealing membrane to seal the pressure relief channel in close cooperation, the sealing performance of the explosion-proof valve under natural conditions is optimized, which greatly reduces the frequency and total amount of gas exchange between the inside of the housing and the outside, reduces the generation of condensate inside the housing, thereby improving the reliability of the battery device and the reliability of the energy storage device. Furthermore, the reset function of the elastic element enables the explosion-proof valve to be reused, reducing the cost caused by damage or replacement after single use.

[0042] Thirdly, embodiments of this application provide an energy storage device, including:

[0043] Battery devices such as any of the above.

[0044] In the above technical solution, through the configuration of the battery device, on the one hand, the box can release pressure from the inside to the outside through the explosion-proof valve, and prevent air from entering from the outside to the inside, thus realizing the one-way ventilation function of the explosion-proof valve. On the other hand, by using the piston and the sealing diaphragm to tightly cooperate to seal the pressure relief channel, the sealing performance of the explosion-proof valve under natural conditions is optimized, which greatly reduces the frequency and total amount of gas exchange between the inside of the box and the outside, reduces the generation of condensate inside the box, thereby improving the reliability of the battery device and thus improving the reliability of the energy storage device. Furthermore, the reset function of the elastic element enables the explosion-proof valve to be reused, reducing the cost caused by damage or replacement after single use.

[0045] Fourthly, embodiments of this application provide an electrical device, including:

[0046] Battery devices such as any of the above.

[0047] In the above technical solution, through the configuration of the battery device, on the one hand, the box can release pressure from the inside to the outside through the explosion-proof valve, and prevent air from entering from the outside to the inside, thus realizing the one-way ventilation function of the explosion-proof valve. On the other hand, by using the piston and the sealing diaphragm to tightly cooperate to seal the pressure relief channel, the sealing performance of the explosion-proof valve under natural conditions is optimized, which greatly reduces the frequency and total amount of gas exchange between the inside of the box and the outside, reduces the generation of condensate inside the box, thereby improving the reliability of the battery device and thus improving the reliability of the energy storage device. Furthermore, the reset function of the elastic element enables the explosion-proof valve to be reused, reducing the cost caused by damage or replacement after single use. Attached Figure Description

[0048] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0049] Figure 1 is a schematic diagram of the structure of an energy storage device provided in some embodiments of this application;

[0050] Figure 2 is an exploded view of the structure of an explosion-proof valve provided in some embodiments of this application;

[0051] Figure 3 is a schematic diagram of the structure of an explosion-proof valve provided in some embodiments of this application;

[0052] Figure 4 is a cross-sectional view of the explosion-proof valve and housing provided in some embodiments of this application;

[0053] Figure 5 is a cross-sectional view of an explosion-proof valve, housing, and plug provided in some embodiments of this application;

[0054] Figure 6 is a cross-sectional view of the valve body and sealing diaphragm provided in some embodiments of this application;

[0055] Figure 7 is one of the cross-sectional views of the sealing membrane provided in some embodiments of this application;

[0056] Figure 8 is a second cross-sectional view of the sealing membrane provided in some embodiments of this application;

[0057] Figure 9 is a third cross-sectional view of the sealing membrane provided in some embodiments of this application.

[0058] Reference numerals: Energy storage device 1, cabinet 2, battery cluster 3; plug 4; explosion-proof valve 10, cavity 101; valve body 11, pressure relief channel 111, pressure relief port 112, first mounting groove 113, third mounting groove 114, fourth mounting groove 115, slot 116; valve cover 12, buckle 121; sealing membrane 13, first section 131, second section 132, opening 1321, sealing section 133, main body section 1331, rib 1332, limiting boss 134, limiting groove 135, extension 136; piston 14, protrusion 141, plug 142, positioning groove 1421, plug core 143; second mounting groove 15, elastic element 16, nut 17, first sealing element 18, second sealing element 19; housing 20. Detailed Implementation

[0059] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0060] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0061] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0062] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0063] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0064] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0065] The battery cells mentioned in the embodiments of this 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., and the embodiments of this application are not limited to these. Battery cells may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited to these shapes either. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and the embodiments of this application are not limited to these types either.

[0066] A single battery cell includes a casing, electrode assembly, and electrolyte. The casing houses the electrode assembly and electrolyte. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode plates. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, while the uncoated positive current collector protrudes beyond the coated one, serving as the positive electrode tab. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the negative current collector without the negative active material layer protrudes from the one with the negative active material layer. The negative current collector without the negative active material layer serves as the negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. To ensure that a large current can be passed without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together.

[0067] The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.

[0068] In recent years, with the rapid development of energy storage devices, the reliability of batteries, as the core component of energy storage devices, has received increasing attention. During the use of battery devices, if an imbalance in pressure occurs inside and outside the battery, the pressure difference can be reduced by using an explosion-proof valve (also known as a balancing valve) on the battery device to improve its reliability. Traditional explosion-proof valves typically consist of a valve body, valve cover, valve disc, and spring. The valve body has an internal channel that allows gas or liquid to flow under normal conditions, while the valve disc is held in a certain position by elastic elements such as springs to control the opening and closing of the channel. When the internal pressure of the battery device rises to a preset safety threshold, the pressure acts on the valve disc, overcoming the spring force and causing the valve disc to move upward, thereby opening the channel and allowing the internal pressure to be quickly released to the external environment. Because the valve disc is designed to move bidirectionally 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 when the external pressure is greater than the internal pressure. However, in practical applications, the aforementioned explosion-proof valves allow external gases to enter the interior under certain conditions, increasing the risk of external water vapor entering the battery device. This is especially true in high-humidity environments, where water vapor is particularly prone to entering the battery device through the explosion-proof valve, forming condensate, and causing corrosion and damage to the internal components of the battery device.

[0069] Based on the above considerations, in order to solve the problem of the bidirectional venting of the explosion-proof valve affecting the reliability of the battery device, the inventors, after in-depth research, designed a battery device including: a housing, an explosion-proof valve, and at least one battery cell assembly, the battery cell assembly being housed within the housing; the explosion-proof valve being installed within the housing; wherein, the explosion-proof valve includes: a valve body, a valve cover, a sealing diaphragm, a piston, and an elastic element. The valve body forms a pressure relief channel and a pressure relief port; the valve cover is installed within the valve body; the sealing diaphragm is installed within the valve body to isolate the pressure relief channel and the pressure relief port, and has a sealing section for sealing with the valve body; the piston is disposed within the valve body, and the sealing section is clamped between the piston and the valve body, with the piston facing the pressure relief channel; one end of the elastic element abuts against the valve cover, and the other end of the elastic element presses the sealing section against the valve body by pressing the piston.

[0070] In this type of explosion-proof valve, the piston and sealing diaphragm are pressed together by an elastic element to isolate the pressure relief channel and pressure relief port. This structure realizes the one-way ventilation function of the explosion-proof valve, optimizes the sealing performance of the explosion-proof valve under natural conditions, greatly reduces the frequency and total amount of gas exchange between the battery and the outside world, reduces the amount of condensate generated inside the battery, thereby improving the reliability of the battery device and thus improving the reliability of the energy storage device.

[0071] The battery device disclosed in this 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. A battery cluster may include multiple battery devices, which are connected in series via 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.

[0072] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, an energy storage device can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. The energy storage system provided in this application embodiment can be any power system that requires energy storage devices.

[0073] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0074] In some embodiments, referring to FIG1, the energy storage device 1 may include a cabinet 2 and a battery cluster 3, wherein the battery cluster 3 is housed in the cabinet 2.

[0075] The battery device disclosed in this application can also be used in various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0076] The battery device 1 mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0077] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0078] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0079] In some embodiments, the battery device may be a battery pack, which includes a housing 20 and one or more individual battery cells housed within the housing 20.

[0080] As an example, the battery cell assembly can be a battery module, which can be housed in the housing 20 by fixing the battery module in the housing 20.

[0081] As an example, the battery cell assembly can also be housed in the housing 20 by directly fixing multiple battery cells to the housing 20.

[0082] As an example, the housing 20 may include a first housing and a second housing. The first housing and the second housing are fastened together to form a closed space inside the housing 20 to house the battery cell assembly. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing may be a top cover or a bottom plate.

[0083] As an example, the housing 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 the interior of the housing 20 forms an enclosed space to accommodate the battery cell assembly.

[0084] In some embodiments, the housing 20 may be part of the vehicle's chassis structure. For example, a portion of the housing 20 may be at least a portion of the vehicle's floor, or a portion of the housing may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0085] According to some embodiments of this application, referring to FIG2 and further referring to FIG4, this application provides a battery device, which includes: a housing 20, an explosion-proof valve 10, and at least one battery cell assembly. The battery cell assembly is housed within the housing 20; the explosion-proof valve 10 is mounted on the housing 20. The explosion-proof valve 10 includes: a valve body 11, a valve cover 12, a sealing diaphragm 13, a piston 14, and an elastic element 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 isolate the pressure relief channel 111 and the pressure relief port 112, and the sealing membrane 13 has a sealing section 133 for sealing with the valve body 11; the sealing section 133 is sandwiched between the piston 14 and the valve body 11, and the piston 14 faces the pressure relief channel 111; the elastic member 16 abuts against the valve cover 12, and the elastic member 16 is used to press the sealing section 133 toward the valve body 11 by the piston 14.

[0086] The valve body 11 can be made of metal or plastic, and the valve cover 12 can be made of metal or plastic.

[0087] For example, both the valve body 11 and the valve cover 12 are made of plastic materials, such as polyetheretherketone, polytetrafluoroethylene, or polyvinylidene fluoride.

[0088] For example, both the valve body 11 and the valve cover 12 are made of metal, such as cast iron, carbon steel or stainless steel.

[0089] As shown in Figures 2-6, the valve body 11 serves as the main structure of the explosion-proof valve 10. The valve body 11 is internally designed with a pressure relief channel 111 and a pressure relief port 112. The pressure relief channel 111 is the path through which the pressure medium needs to be guided and released under abnormally high pressure conditions, while 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 the controllable range. On the one hand, the valve body 11 is designed to be more robust and can withstand higher pressure shocks. The pressure relief port 112 located on the valve body 11 helps maintain the overall structural stability of the explosion-proof valve 10 and reduces deformation or damage to 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, enabling faster and more efficient explosion-proof pressure relief. The valve cover 12 is installed on the valve body 11, serving to seal and protect the internal structure.

[0090] The number of pressure relief ports 112 can be one or more, with "more" meaning two or more.

[0091] For example, in some embodiments, the number of pressure relief ports 112 is set to 6.

[0092] As shown in Figures 4-9, the sealing diaphragm 13 is a key component for pressure control in the explosion-proof valve 10. The sealing diaphragm 13 has a sealing section 133, which 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 leakage of the medium under normal pressure. At the same time, the sealing diaphragm 13 also needs to have sufficient flexibility to respond to pressure changes through deformation.

[0093] The sealing membrane 13 is typically made of an elastic material, such as rubber, silicone, or fluororubber.

[0094] For example, in some embodiments, the sealing membrane 13 is made of rubber.

[0095] As shown in Figures 2 and 4-5, the piston 14 cooperates with the sealing section 133 of the sealing diaphragm 13. The sealing state of the sealing diaphragm 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 be moved by the pressure, thereby changing the sealing effect of the sealing diaphragm 13 and allowing the pressure medium to be released through the pressure relief channel 111 and the pressure relief port 112. The elastic element 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 element 16 needs to consider the matching of its elastic force with the system working pressure to ensure that the sealing diaphragm 13 can maintain good sealing performance under normal working pressure; while when the pressure rises abnormally, it can allow the piston 14 to overcome the elastic force and move to achieve timely pressure relief.

[0096] Specifically, the elastic element 16 may include, but is not limited to, a spring, an elastic sleeve, or an elastic air cushion, etc., without limitation.

[0097] For example, in some embodiments, as shown in Figures 2 and 4-5, the elastic element 16 is a spring.

[0098] In some embodiments, the main body of the piston 14 may be cylindrical.

[0099] Piston 14 can be made of plastic or metal.

[0100] For example, piston 14 is made of plastic material, such as polytetrafluoroethylene, nitrile rubber, or fluororubber.

[0101] For example, piston 14 is made of metal, such as aluminum alloy, cast iron or steel alloy.

[0102] In related technologies, although some explosion-proof valves can also achieve one-way ventilation, most of them rely solely on pistons for sealing. The contact surface between the piston and the valve body is of relatively poor quality, and the piston wears out severely under long-term use, resulting in poor sealing performance of the explosion-proof valve and thus the one-way ventilation effect does not meet expectations.

[0103] In actual operation, as shown in Figures 4 and 5, when the gas pressure inside the housing 20 is less than the opening pressure set by the explosion-proof valve 10, the explosion-proof valve 10 is in normal working condition. In normal working condition, the elastic element 16 is elastically compressed between the valve cover 12 and the piston 14, causing the piston 14 to press against the sealing membrane 13 towards the pressure relief channel 111 under the action of elastic force. The sealing membrane 13 is tightly fitted to the valve body 11, and the gas in the pressure relief channel 111 cannot be discharged to the external environment due to the sealing effect of the sealing membrane 13 and the piston 14. When the gas pressure inside the housing 20 is greater than or equal to the opening pressure set by the explosion-proof valve 10, the explosion-proof valve 10 is in a burst pressure relief state. Under pressure, the high-pressure gas squeezes the sealing section 133 and piston 14 outward, causing the sealing membrane 13 to deform. The piston 14 moves toward the valve cover 12, further compressing the elastic element 16 to shrink its length. At this time, a gap appears between the sealing membrane 13 and the valve body 11. The pressure relief channel 111 is connected to the pressure relief port 112 through this gap. The gas inside the housing 20 is quickly discharged through the pressure relief channel 111, the gap, and the pressure relief port 112. 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 element 16, and the sealing membrane 13 re-fits the valve body 11, restoring the normal sealing state.

[0104] 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 the actual situation, thereby determining the flow rate during venting.

[0105] The battery device provided in this application embodiment, through the cooperation between the elastic element 16, piston 14 and sealing membrane 13, achieves the following: Firstly, the housing 20 can release pressure from the inside to the outside through the explosion-proof valve 10, and prevent air from entering from the outside to the inside, thus realizing the one-way ventilation function of the explosion-proof valve 10. Secondly, by utilizing the tight cooperation between piston 14 and sealing membrane 13 to seal the pressure relief channel 111, the sealing performance of the explosion-proof valve under natural conditions is optimized, greatly reducing the frequency and total amount of gas exchange between the inside of the housing 20 and the outside, reducing the generation of condensate inside the housing 20, thereby improving the reliability of the battery device and the reliability of the energy storage device. Furthermore, the reset function of the elastic element 16 enables the explosion-proof valve 10 to be reused, reducing the cost incurred due to damage or replacement after single use.

[0106] According to some embodiments of this application, as shown in Figures 4-5, a cavity 101 is formed between the sealing membrane 13 and the valve body 11, the pressure relief port 112 is connected to the cavity 101, and the sealing section 133 is used to isolate the pressure relief channel 111 and the cavity 101.

[0107] In actual operation, as shown in Figures 4 and 5, under the explosive pressure relief state, the pressure relief process of the high-pressure gas in the housing 20 is as follows: the high-pressure gas first enters the pressure relief channel 111 in the valve body 11 and squeezes the sealing section 133 and piston 14 outward. The sealing membrane 13 deforms, and the piston 14 moves toward the valve cover 12. 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. The high-pressure gas then enters the cavity 101 through the gap and is finally discharged to the outside through the pressure relief port 112 connected to the cavity 101.

[0108] The battery device provided in this application embodiment, through the setting of the cavity 101 and the structural design of the pressure relief port 112 formed on the valve body 11, on the one hand, the existence of the cavity 101 is equivalent to a pressure buffer, which can alleviate the impact force of 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. On the other hand, the pressure relief port 112 is directly set on the valve body 11, which greatly shortens the pressure relief path, making the pressure relief process simple and efficient, and enabling faster and more efficient burst pressure relief.

[0109] According to some embodiments of this application, as shown in FIG5, the piston 14 is configured to move toward the valve cover 12 when the gas pressure inside the housing 20 is greater than or equal to the opening pressure value set by the explosion-proof valve 10, and the sealing membrane 13 is deformed.

[0110] In actual operation, when the gas pressure inside the battery device rises to a value greater than or equal to the opening pressure set by the explosion-proof valve 10 due to some reason (such as battery overheating, gas generation, etc.), the piston 14 will be subjected to the pressure of the gas inside the housing 20, thus moving towards the valve cover 12. This movement causes the sealing membrane 13, which was originally held by the piston 14 and the valve body 11, to deform. In particular, the second section 132 of the sealing membrane 13 will bulge outward due to the push of the gas pressure, thereby causing the sealing section 133 of the sealing membrane 13 to gradually separate from the valve body 11, opening the pressure relief channel 111.

[0111] The battery device provided in this application embodiment, through the above-described mechanism of piston 14 action during pressure relief and the relationship between piston 14 and sealing membrane 13, allows the combination of piston 14 and sealing membrane 13 to accurately respond to changes in gas pressure inside the housing 20. When the pressure reaches or exceeds this set value, the movement of piston 14 and deformation of sealing membrane 13 will quickly initiate the pressure relief process, and the pressure relief process becomes more stable and controllable. As the pressure gradually increases, sealing membrane 13 will gradually deform and open the pressure relief channel 111, rather than suddenly rupturing or failing, which helps to reduce the impact and destructive force caused by sudden pressure relief and protect the integrity of the battery device and its surrounding environment.

[0112] According to some embodiments of this application, as shown in Figures 4 and 7-9, the sealing section 133 includes a main body section 1331 and at least one rib 1332 connected to the side of the main body section 1331 away from the valve cover 12. The rib 1332 is arranged around the outlet of the pressure relief channel 111 and abuts against the valve body 11.

[0113] For example, in some embodiments, as shown in Figures 7-8, the sealing section 133 includes a rib 1332.

[0114] For example, in some other embodiments, as shown in FIG9, the sealing section 133 includes two ribs 1332.

[0115] As shown in Figures 4 and 7-9, the radial thickness of the rib 1332 gradually decreases from the end connected to the main body section 1331 to the end abutting against the valve body 11. The rib 1332 is arranged in a ring around the outlet of the pressure relief channel 111. When the explosion-proof valve 10 is assembled, the rib 1332 is arranged in a compressed state between the main body section 1331 and the valve body 11 to achieve circumferential sealing of the outlet of the pressure relief channel 111.

[0116] The battery device provided in this application embodiment, by configuring the sealing section 133 as described above, includes a main body section 1331 and at least one rib 1332. On the one hand, the rib 1332 strengthens the structure of the sealing section 133, enabling the sealing section 133 to better resist gas pressure and reduce the risk of leakage due to pressure. On the other hand, the rib 1332 is arranged around the outlet of the pressure relief channel 111 and abuts against the valve body 11, forming a tighter sealing surface, further reducing the amount of condensate generated inside the battery device, thereby improving the reliability of the battery device. Furthermore, 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.

[0117] According to some embodiments of this application, as shown in FIG7, in the natural state, the inner diameter of the rib 1332 gradually increases from the end connected to the main body section 1331 to the end abutting against the valve body 11, and the angle between the inner sidewall of the rib 1332 and the main body section 1331 is an obtuse angle, while the angle between the outer sidewall of the rib 1332 and the main body section 1331 is an acute angle.

[0118] In this embodiment, as shown in FIG7, the plane on the side of the main body segment 1331 away from the valve cover 12 is used as the projection plane. The orthographic projection of the end of the rib 1332 away from the main body segment 1331 on the projection plane surrounds the outside of the centerline of the other end of the rib 1332. That is, the rib 1332 can be inclined outward in a trumpet shape. Specifically, the inclination angle of the rib 1332 can be 30°, 45°, 60° or other acute angles, etc., which are not limited here.

[0119] It should be noted that the above-mentioned natural state is the state in which the sealing film 13 has not undergone visible deformation. In other words, the natural state is the state in which the sealing film 13 returns to a state in which it no longer deforms after being removed from the explosion-proof valve 10.

[0120] The battery device provided in this application embodiment, through the shape design of the aforementioned rib 1332, the flared design allows the rib 1332 to form a wider and tighter contact surface when it contacts 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 support of the sealing section 133, enabling it to better resist the influence of external pressure and vibration, which helps to maintain the sealing effect while also extending the service life of the sealing membrane 13.

[0121] According to some embodiments of this application, as shown in FIG9, the sealing section 133 includes a plurality of spaced ribs 1332, and the plurality of ribs 1332 are concentrically arranged.

[0122] For example, in some embodiments, the sealing section 133 includes two spaced-apart ribs 1332, both of which are annular, with one rib 1332 surrounding the outside of the other rib 1332, and the curvature centers of the two ribs 1332 coincide.

[0123] For example, in some other embodiments, the sealing section 133 includes three spaced-apart ribs 1332, which are concentrically arranged.

[0124] The battery device provided in this application embodiment, through the above-mentioned structural design of multiple concentric ribs 1332, has the following advantages: Firstly, the multiple ribs 1332 form a multi-layer protective structure. When one layer of ribs 1332 is subjected to pressure or wear, the other ribs 1332 can still maintain the sealing effect, thereby improving the overall sealing reliability and durability. Secondly, the multiple concentric ribs 1332 can more effectively block the path of gas leakage. Even if a small leak occurs at a certain point, it will be blocked by other ribs 1332, thereby reducing the risk of leakage. Furthermore, the multiple ribs 1332 are spaced apart, which can distribute 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.

[0125] According to some embodiments of this application, as shown in Figures 7-9, the sealing membrane 13 includes a first segment 131, a second segment 132 and a sealing segment 133 connected in sequence. The first segment 131 is fixed to the valve body 11 and is closer to the valve cover 12 than the sealing segment 133. The second segment 132 is inclined.

[0126] The connection method between the first segment 131 and the valve body 11 may include, but is not limited to, bonding, snap-fit ​​or interference fit, etc., and there is no restriction here.

[0127] For example, in some embodiments, the connection between the first segment 131 and the valve body 11 is by adhesive bonding.

[0128] In this embodiment, as shown in Figures 7-9, the first segment 131 is folded towards the pressure relief channel 111 relative to the second segment 132. The lower surface of the first segment 131 is arc-shaped to facilitate installation on the valve body 11. The second segment 132 is inclined from the inside out towards the valve cover 12, and the thickness of the second segment 132 is much smaller than the thickness of the first segment 131, thereby providing a larger deformation space. The sealing segment 133, as an important part of the sealing membrane 13, plays the role of sealing the pressure relief channel 111.

[0129] The first segment 131 can be connected to the valve body 11 by interference fit, bonding, or snap-fit. This connection reduces the shaking and displacement of the sealing diaphragm 13 in the sealed state and improves the accuracy of the sealing diaphragm 13's reset after pressure relief, thus comprehensively enhancing the stability of the sealing diaphragm 13. The high-pressure gas in the pressure relief channel 111 can first enter the cavity 101 formed between the second segment 132 and the valve body 11, and then be discharged through the pressure relief port 112. The cavity 101 acts as a pressure buffer, mitigating the impact of high-pressure gas to a certain extent, making the pressure relief process more stable and controllable, and reducing the impact and destructive force caused by sudden gas release.

[0130] In some embodiments, the second segment 132 is inclined at the same angle towards the valve cover 12 from the inner end to the outer end.

[0131] In other embodiments, the second segment 132 extends obliquely from the inner end to the outer end in a direction close to the valve cover 12, but may have other extension directions or different angles in some areas. For example, some areas may extend radially, or different areas may have different angles.

[0132] The battery device provided in this application embodiment, by configuring the sealing membrane 13 as described above, includes a first segment 131, a second segment 132, and a sealing segment 133. On the one hand, the connection between the first segment and the valve body reduces the shaking and displacement of the sealing membrane in the sealed state, and improves the accuracy of the sealing membrane's reset after bursting and depressurization, thereby comprehensively improving the stability of the sealing membrane. On the other hand, by setting a cavity, the depressurization process is made more stable and controllable, reducing the impact and destructive force caused by sudden gas release. Furthermore, the inclined design of the second segment 132 makes it easier for the second segment 132 to deform under pressure, thereby absorbing and dispersing pressure, protecting the sealing membrane 13 from excessive stress, and thus improving the durability and stability of the sealing membrane 13. Moreover, as the core part of the sealing membrane 13, the sealing segment 133 directly participates in the process of sealing the depressurization channel 111, and can maintain the reliability and durability of the seal under normal conditions, reducing gas leakage.

[0133] According to some embodiments of this application, as shown in Figures 7-9, the second segment 132 forms an opening 1321, and the width of the opening 1321 gradually increases from one end near the pressure relief channel 111 to the other end away from the pressure relief channel 111.

[0134] In this embodiment, as shown in Figures 7-9, the second segment 132 is designed as an umbrella shape, and the opening 1321 is designed as a trumpet mouth. Specifically, the flared part of the opening 1321 is located near the valve cover 12, and the constricted part of the opening 1321 is located near the pressure relief channel 111. The space of the opening 1321 is sufficient for the sealing membrane 13 to deform sufficiently when pressure is released, thereby guiding the formation of the gap between the sealing membrane 13 and the valve body 11.

[0135] In other embodiments, the width of the opening 1321 remains constant from the end near the pressure relief channel 111 to the end away from the pressure relief channel 111.

[0136] The battery device provided in this application embodiment, by designing the opening 1321 formed by the second segment 132 as a funnel shape, provides a larger deformation space for the sealing membrane 13. Under the condition of burst pressure relief, the sealing membrane 13 can deform more easily to adapt to pressure changes, thereby reducing the stress on the sealing membrane 13 itself and extending the service life of the sealing membrane 13.

[0137] According to some embodiments of this application, as shown in Figures 7-9, the vertical cross-section of the second segment 132 includes multiple arc segments, and the curvature centers of two adjacent arc segments are located on both sides of the second segment 132.

[0138] Understandably, as shown in Figures 7-9, the vertical cross-section of the second segment 132 is designed to be wavy. This design allows the second segment 132 to have a larger unfolded area. Under the condition of explosive decompression, the sealing membrane 13 will deform upward, and the second segment 132 with a larger unfolded area greatly increases the space for upward deformation. This accelerates the gas emission speed under the condition of explosive decompression and can better disperse and resist the gas impact force, thereby improving the overall stiffness and stability of the sealing membrane 13.

[0139] The battery device provided in this application embodiment, by designing the vertical cross-section of the second segment 132 as wavy, increases the unfolded area of ​​the second segment 132, leaving a larger margin for the upward deformation of the sealing membrane 13, thereby accelerating the gas emission speed under the burst pressure relief state, and better dispersing and resisting the gas impact force, thereby improving the overall rigidity and stability of the sealing membrane 13.

[0140] According to some embodiments of this application, as shown in Figures 2, 4-5 and 7-9, a first mounting groove 113 is defined on the side of the valve body 11 near the valve cover 12, a first segment 131 is installed in the first mounting groove 113, and the first segment 131 is elastically compressed between the valve cover 12 and the valve body 11.

[0141] In this embodiment, as shown in Figures 2, 4-5 and 7-9, the opening of the first mounting groove 113 faces the valve cover 12, and the height of the outer side wall of the first mounting groove 113 is higher than the height of the inner side wall of the first mounting groove 113, so as to avoid the part of the second segment 132 that is connected to the first segment 131. The first segment 131 is installed in the first mounting groove 113 in a compressed state.

[0142] The battery device provided in this application embodiment, through the setting of the first mounting groove 113, provides clear positioning and guidance for the installation of the first segment 131, making the installation process of the sealing film 13 simpler and faster. On the other hand, the first segment 131 is elastically compressed between the valve cover 12 and the valve body 11, which 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.

[0143] According to some embodiments of this application, as shown in Figures 2, 4 and 6-9, the sealing membrane 13 further includes a limiting boss 134, which defines a limiting groove 135 between the limiting boss 134 and the sealing section 133, and at least a portion of the piston 14 is mounted in the limiting groove 135.

[0144] In this embodiment, as shown in Figures 2 and 4, the limiting boss 134 is annular, and its axial direction 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. The sealing section 133 is also annular, and its axial direction is also parallel to the vertical direction. In other words, the hollow area of ​​the sealing section 133 cooperates with at least a portion of the piston 14. Specifically, the piston 14 includes a connected plug head 142 and a plug core 143. The plug core 143 protrudes relative to the plug head 142 toward the pressure relief channel 111. The plug core 143 fills the hollow area of ​​the sealing section 133, so that the sealing membrane 13 and the piston 14 form a tight fit, reducing the gas leakage from the gap between the sealing membrane 13 and the piston 14.

[0145] The battery device provided in this application embodiment, through the setting of the aforementioned limiting boss 134 and limiting groove 135, on the one hand, provides a precise installation position for the piston 14 by the limiting groove 135 formed by the limiting boss 134 and the sealing section 133, reducing the horizontal offset and shaking of the piston 14, thereby improving the reliability of the seal. On the other hand, the contact between the sealing membrane 13 and the piston 14 is tighter, 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. Furthermore, it reduces 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.

[0146] According to some embodiments of this application, as shown in FIG4, the wall surface of the plug head 142 opposite to the plug core 143 is provided with a positioning groove 1421.

[0147] The shape of the positioning groove 1421 may include, but is not limited to, a circle, a square or other polygons, etc., and is not limited here.

[0148] For example, the positioning groove 1421 is circular and located in the middle region of the wall of the plug head 142 on the side opposite to the plug core 143.

[0149] Understandably, on the one hand, the positioning groove 1421 allows specific tools to engage with the piston 14, providing 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 status of the piston 14; furthermore, the positioning groove 1421 helps reduce stress concentration points and extend the service life of the piston 14; and still more importantly, the positioning groove 1421 can increase the coefficient of friction on the surface of the plug 142, making it less prone to slippage when tightening.

[0150] According to some embodiments of this application, as shown in FIG4, one of the surfaces on piston 14 that abut against sealing section 133 and the surfaces on sealing section 133 that abut against piston 14 is serrated.

[0151] In some embodiments, the surface of the piston 14 that abuts against the sealing section 133 is serrated.

[0152] In other embodiments, the surface of the sealing section 133 that abuts against the piston 14 is serrated.

[0153] Understandably, the serrated contact surface forms a labyrinthine sealing structure between the piston 14 and the sealing section 133. The principle of the labyrinth seal is to consume the fluid's energy and reduce leakage through complex channels and tortuous paths. Therefore, this structure can increase the resistance and path length when the gas passes through, thereby significantly improving the sealing performance. The serrated contact surface design can increase the contact area and contact points between the piston 14 and the sealing section 133, making the contact between the piston 14 and the sealing section 133 tighter and more stable. This tight contact helps 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, reducing 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.

[0154] The battery device provided in this application, by designing the contact surface between the piston 14 and the sealing section 133 as serrated, can, on the one hand, increase the resistance and path length when gas passes through, thereby significantly improving the sealing performance; on the other hand, it increases the contact area and contact points between the piston 14 and the sealing section 133, making the contact between the piston 14 and the sealing section 133 tighter and more stable, thereby helping to reduce the risk of leakage caused by excessive gaps; and on the other hand, it disperses 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, and thus extending the service life of the sealing membrane 13 and the piston 14.

[0155] According to some embodiments of this application, as shown in Figures 2, 4 and 6, the sealing membrane 13 further includes an extension 136 that extends from the limiting boss 134 toward the center of the valve body 11 so that the extension 136, the limiting boss 134 and the sealing section 133 cover the edge of the piston 14.

[0156] In this embodiment, as shown in Figures 2, 4, and 6, the extension 136 is annular, and its outer peripheral wall is connected to the inner peripheral wall of the limiting boss 134. The extension 136 and the limiting boss 134 are approximately perpendicular, and the limiting boss 134 and the sealing section 133 are approximately perpendicular. The extension 136 and the sealing section 133 are spaced apart in the vertical direction. When the sealing membrane 13 is assembled, the extension 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.

[0157] The battery device provided in this application embodiment, through the provision of the extension 136, realizes that the extension 136, the limiting boss 134 and the sealing section 133 wrap around the edge of the piston 14. On the one hand, the extension 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 film 13, thereby extending the service life of the sealing film 13 and the piston 14.

[0158] According to some embodiments of this application, as shown in Figures 4-5, the elastic element 16 is elastically compressed between the valve cover 12 and the extension 136.

[0159] In actual operation, as shown in Figures 4 and 5, under normal working conditions, the elastic element 16 is installed in a compressed state between the valve cover 12 and the sealing membrane 13. That is, the elastic element 16 continuously applies downward pressure to the sealing membrane 13. Specifically, based on the end of the elastic element 16 facing away from the valve cover 12 abutting against the limiting boss 134, the elastic element 16 applies downward pressure to the extension 136, causing at least part of the piston 14 installed in the limiting groove 135 to press downward against the sealing section 133 when subjected to this pressure. Therefore, under the action of elastic force, the extension 136, the peripheral part of the piston 14, and the sealing section 133 are tightly pressed together in the vertical direction, and the sealing section 133 is compressed 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.

[0160] It should be noted that the elastic force of the elastic element 16 can be adjusted according to different working conditions and the elastic force can be adjusted according to the internal pressure to adapt to various needs. Specifically, taking the elastic element 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.

[0161] The battery device provided in this application embodiment, by setting the elastic member 16 to abut against the extension 136 as described above, on the one hand, compared with the design of abutting against the piston 14, makes the area of ​​action of the elastic force concentrated on the periphery of the piston 14, thereby reducing the probability of the piston 14 blocking the pressure relief channel 111, and thus improving the safety performance of the explosion-proof valve 10. On the other hand, the elastic member 16 provides pressure to the sealing membrane 13, enhances the sealing effect, and helps to reduce the accidental explosion of the explosion-proof valve 10 caused by accidental opening. Furthermore, the elastic force of the elastic member 16 can be adjusted according to different working conditions and the elastic force can be adjusted according to the internal pressure, which can adapt to various needs, thereby increasing the versatility and flexibility of the explosion-proof valve 10.

[0162] According to some embodiments of this application, as shown in Figures 2, 4 and 6, the piston 14 includes a protrusion 141 that protrudes toward the valve cover 12. A second mounting groove 15 is formed between the protrusion 141, the limiting boss 134 and the extension 136. One end of the elastic member 16 away from the valve cover 12 abuts against the bottom wall of the second mounting groove 15.

[0163] In this embodiment, as shown in FIG4, the protrusions 141 can all be annular. The first mounting groove 113 surrounds the outside of the second mounting groove 15, and the extension 136 and the protrusions 141 can be concentrically arranged. The top surface height of the extension 136 can be greater than the top surface height of the protrusions 141. The extension 136 and the protrusions 141 are spaced apart in the horizontal direction. The limiting boss 134 can be provided between the extension 136 and the protrusions 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. 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 136 and the protrusions 141. The end of the elastic member 16 near the valve cover 12 can be sleeved on the short column structure.

[0164] The battery device provided in this application embodiment, through the aforementioned protrusion 141 and the second mounting groove 15, provides a precise mounting position for the elastic element 16, ensuring that the elastic element 16 can accurately abut against the limiting protrusion 134, thereby maintaining a stable sealing effect. Furthermore, in conjunction with the guiding effect of the short column structure on the valve cover 12, it limits the deformation direction of the elastic element 16, reducing the probability of displacement or detachment, thus improving the overall stability and reliability of the explosion-proof valve 10. Additionally, by changing the depth of the second mounting groove 15, the compression stroke of the elastic element 16 can be limited, helping to reduce damage or failure of the elastic element 16 due to over-compression, thereby protecting the entire sealing system and extending the service life of the explosion-proof valve 10. According to some embodiments of this application, as shown in Figures 2-4 and 6, the valve cover 12 is provided with a plurality of snap fasteners 121 spaced apart circumferentially, and the valve body 11 is provided with a plurality of slots 116 corresponding to and engaging with the snap fasteners 121.

[0165] Multiple means two or more. For example, in some embodiments, the valve cover 12 is provided with four buckles 121 that are spaced apart in the circumferential direction, and the valve body 11 is provided with four slots 116 that correspond one-to-one with the multiple buckles 121 and engage with them.

[0166] As shown in Figures 2-4 and 6, the buckle 121 protrudes downwards, 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 designed to be staggered in the circumferential direction. The buckle 121 and the slot 116 are engaged and fixed to realize the 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 element 16.

[0167] The battery device provided in this application embodiment, 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, 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, reducing the installation difficulty and cost. When it is necessary to repair or replace the valve cover 12, it is only necessary to simply detach the buckle 121 from the slot 116, which improves the convenience of maintenance.

[0168] According to some embodiments of this application, as shown in Figures 2-5, the explosion-proof valve 10 further includes a nut 17 and a first sealing element 18.

[0169] As shown in Figures 5 and 6, the nut 17 is threaded to the outer surface of the valve body 11. The valve body 11 defines a third mounting groove 114 for mounting the first seal 18. The third mounting groove 114 faces the nut 17, and a gap is formed between the nut 17 and the first seal 18 for clamping the housing 20.

[0170] In this embodiment, as shown in FIG5, when the explosion-proof valve 10 is assembled in the housing 20, the first sealing member 18 is installed in the third mounting groove 114 in a compressed state. Specifically, the first sealing member 18 is elastically compressed between the valve body 11 and the housing 20. The first sealing member 18 and the housing 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 is located inside the housing 20. The nut 17 acts as a fastener and abuts against the inner wall surface of the housing 20.

[0171] The battery device provided in this application embodiment, through the aforementioned arrangement of the nut 17 and the first sealing member 18, on the one hand, the nut 17 is threadedly connected to the outer surface of the valve body 11, which can tightly clamp the first sealing member 18 between the valve body 11 and the housing 20 of the battery device, forming a sealed interface. This clamping effect can effectively reduce gas leakage from the gap between the housing 20 and the valve body 11, improving the overall sealing performance. On the other hand, the third mounting 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 sealing member 18, but also allows the first sealing member 18 to be subjected to force more evenly when pressed by the nut 17, thereby further improving the sealing effect.

[0172] According to some embodiments of this application, as shown in Figures 2-5, the explosion-proof valve 10 further includes a second sealing element 19.

[0173] As shown in Figures 5 and 6, a fourth mounting groove 115 is formed on the outer periphery of the valve body 11, and the second seal 19 is installed in the fourth mounting groove 115.

[0174] In actual operation, when testing the airtightness of the housing 20, the plug 4 is placed in the corresponding position of the housing 20 so that the plug 4 corresponds to the second seal 19. Pay attention to the direction and position of the plug 4 to 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 forms an effective sealing interface. While applying pressure, observe whether there is any gas or liquid leaking from the sealing interface. If any leakage is detected, immediately stop applying pressure 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 housing 20, ensuring there is no leakage at the connection. Turn on the power switch of the airtightness tester and set the parameters such as inflation time and pressure holding time according to the test requirements. Start the airtightness tester to perform the test. The tester will fill a certain amount of test gas into the housing 20 and monitor the changes in gas pressure inside the housing 20. During the test, pay attention to the display screen or indicator lights of the airtightness tester to understand the test results in a timely manner. Based on the test results of the airtightness tester, determine whether the airtightness of the housing 20 meets the requirements. If the test results show that the gas pressure inside the housing 20 remains stable within the specified time and there is no leakage, it indicates that the airtightness of the housing 20 is good. Otherwise, it indicates that there is a leakage problem and it needs to be repaired or replaced.

[0175] The battery device provided in this application embodiment, through the setting of the second sealing member 19, on the one hand, the second sealing member 19 is installed in the fourth mounting groove 115 of the valve body 11, which is specially designed for airtightness testing. When the airtightness test of the housing 20 is required, it is only necessary to cooperate the plug 4 with the second sealing member 19 to quickly and easily establish a closed test environment. On the other hand, through the special sealing structure and cooperation method, the risk of leakage during the airtightness test can be reduced more effectively, thereby improving the accuracy and reliability of the airtightness test.

[0176] According to some embodiments of this application, the valve body 11, valve cover 12, sealing membrane 13, and piston 14 are all plastic parts.

[0177] The battery device provided in this application embodiment, except that the elastic element 16 is made of metal, the valve body 11, valve cover 12, sealing membrane 13 and piston 14 are all made of plastic. On the one hand, plastic materials are cheaper than metal materials while maintaining the function and performance. Moreover, 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 than traditional metal materials, thereby achieving the overall lightweighting of the explosion-proof valve 10.

[0178] According to some embodiments of this application, this application also 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 element 16.

[0179] 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 to isolate the pressure relief channel 111 and the pressure relief port 112, and has a sealing section 133 for sealing with the valve body 11; the piston 14 is disposed inside 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.

[0180] The explosion-proof valve 10 provided in this embodiment, through the cooperation between the elastic element 16, piston 14 and sealing membrane 13, allows the housing 20 to release pressure from the inside to the outside through the explosion-proof valve 10, while preventing air from entering from the outside to the inside, thus realizing the one-way ventilation function of the explosion-proof valve 10. On the other hand, the piston 14 and sealing membrane 13 work together to seal the pressure relief channel 111, optimizing the sealing performance of the explosion-proof valve under natural conditions, greatly reducing the frequency and total amount of gas exchange between the inside of the housing 20 and the outside, reducing the generation of condensate inside the housing 20, thereby improving the reliability of the battery device and the energy storage device. Furthermore, the reset function of the elastic element 16 enables the explosion-proof valve 10 to be reused, reducing the cost incurred due to damage or replacement after single use.

[0181] According to some embodiments of this application, this application also provides an energy storage device, including: a battery device as described above.

[0182] The energy storage device provided in this application embodiment, through the configuration of the battery device described above, on the one hand, allows the housing 20 to release pressure from the inside to the outside through the explosion-proof valve 10, preventing air from entering from the outside to the inside, thus realizing the one-way ventilation function of the explosion-proof valve 10. On the other hand, the piston 14 and the sealing membrane 13 work together to seal the pressure relief channel 111, optimizing the sealing performance of the explosion-proof valve under natural conditions, greatly reducing the frequency and total amount of gas exchange between the inside of the housing 20 and the outside, reducing the generation of condensate inside the housing 20, thereby improving the reliability of the battery device, and further improving the reliability of the energy storage device. Furthermore, the reset function of the elastic element 16 enables the explosion-proof valve 10 to be reused, reducing the cost incurred due to damage or replacement after single use.

[0183] According to some embodiments of this application, this application also provides an electrical device, including: a battery device as described above.

[0184] The electrical device provided in this application embodiment, through the configuration of the battery device described above, on the one hand, allows the housing 20 to release pressure from the inside to the outside through the explosion-proof valve 10, preventing air from entering from the outside to the inside, thus realizing the one-way ventilation function of the explosion-proof valve 10. On the other hand, the piston 14 and the sealing membrane 13 work together to seal the pressure relief channel 111, optimizing the sealing performance of the explosion-proof valve under natural conditions, greatly reducing the frequency and total amount of gas exchange between the inside of the housing 20 and the outside, reducing the generation of condensate inside the housing 20, thereby improving the reliability of the battery device, and further improving the reliability of the energy storage device. Furthermore, the reset function of the elastic element 16 enables the explosion-proof valve 10 to be reused, reducing the cost incurred due to damage or replacement after single use.

[0185] According to some embodiments of this application, referring to Figures 2-9, this application provides a battery device, including: a housing 20, an explosion-proof valve 10, and at least one battery cell assembly, the battery cell assembly being housed within the housing 20; the explosion-proof valve 10 is installed in the housing 20, wherein the explosion-proof valve 10 includes: a valve body 11, a valve cover 12, a sealing membrane 13, a piston 14, and an elastic element 16. The valve body 11 forms a pressure relief channel 111 and a pressure relief port 112; the valve cover 12 is installed in the valve body 11; the sealing membrane 13 is installed in the valve body 11 to isolate the pressure relief channel 111 and the pressure relief port 112, and has a sealing section 133 for sealing with the valve body 11; the piston 14 is disposed within 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 element 16 abuts against the valve cover 12, and the other end of the elastic element 16 presses the sealing section 133 toward the valve body 11 by pressing the piston 14. A cavity 101 is formed between the sealing diaphragm 13 and the valve body 11. The pressure relief port 112 communicates with the cavity 101. The sealing section 133 is used to isolate the pressure relief channel 111 and the cavity 101. The piston 14 is configured to move toward the valve cover 12 when the gas pressure inside the housing 20 is greater than or equal to the opening pressure value set by the explosion-proof valve 10, and the sealing diaphragm 13 deforms. The sealing section 133 includes a main body section 1331 and at least one rib 1332 connected to the side of the main body section 1331 facing away from the valve cover 12. The rib 1332 is arranged around the outlet of the pressure relief channel 111 and abuts against the valve body 11. In its natural state, the inner diameter of the rib 1332 gradually increases from the end connected to the main body section 1331 to the end abutting against the valve body 11, and the angle between the inner sidewall of the rib 1332 and the main body section 1331 is an obtuse angle, while the angle between the outer sidewall of the rib 1332 and the main body section 1331 is an acute angle. The sealing section 133 includes a plurality of spaced-apart ribs 1332, which are concentrically arranged. 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 fixed to the valve body 11 and is closer to the valve cover 12 than the sealing section 133. The second section 132 is inclined. The second section 132 forms an opening 1321, the width of which gradually increases from the end near the pressure relief channel 111 to the end away from the pressure relief channel 111. The vertical section of the second segment 132 includes multiple arc segments, with the curvature centers of two adjacent arc segments located on opposite sides of the second segment 132. A first mounting groove 113 is defined on the side of the valve body 11 near the valve cover 12. The first segment 131 is mounted in the first mounting groove 113 and elastically compressed between the valve cover 12 and the valve body 11. The sealing diaphragm 13 also includes a limiting boss 134, which protrudes from the sealing segment 133 toward the valve cover 12. A limiting groove 135 is defined between the limiting boss 134 and the sealing segment 133, and at least a portion of the piston 14 is mounted in the limiting groove 135.The sealing membrane 13 also includes an extension 136, which extends from the limiting boss 134 toward the center of the valve body 11 so that the extension 136, the limiting boss 134, and the sealing section 133 cover the edge of the piston 14. An elastic member 16 is elastically compressed between the valve cover 12 and the extension 136. The piston 14 includes a protrusion 141 protruding toward the valve cover 12, forming a second mounting groove 15 between the protrusion 141, the limiting boss 134, and the extension 136. One end of the elastic member 16 facing away from the valve cover 12 abuts against the bottom wall of the second mounting groove 15. The valve cover 12 is provided with a plurality of circumferentially spaced snap fasteners 121, and the valve body 11 is provided with a plurality of slots 116 corresponding to and engaging with the snap fasteners 121. The explosion-proof valve 10 also includes a nut 17 and a first seal 18. The nut 17 is threaded to the outer surface of the valve body 11. The valve body 11 defines a third mounting groove 114 for mounting the first seal 18. The third mounting groove 114 faces the nut 17, and a gap is formed between the nut 17 and the first seal 18 for clamping the housing 20. The explosion-proof valve 10 also includes a second seal 19. A fourth mounting groove 115 is formed on the outer periphery of the valve body 11, and the second seal 19 is mounted in the fourth mounting groove 115. The valve body 11, valve cover 12, sealing diaphragm 13, and piston 14 are all plastic parts.

[0186] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0187] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery device, characterized in that, include: Box; At least one battery cell assembly is housed within the housing; An explosion-proof valve, wherein the explosion-proof valve is installed in the enclosure; wherein the explosion-proof valve comprises: The valve body forms a pressure relief channel and a pressure relief port; Valve cover, installed on the valve body; A sealing membrane, installed on the valve body, is used to isolate the pressure relief channel and the pressure relief port, and has a sealing section for sealing with the valve body; A piston is disposed within the valve body, and the sealing section is sandwiched between the piston and the valve body; An elastic element, 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.

2. The battery device according to claim 1, characterized in that, A cavity is formed between the sealing membrane and the valve body, the pressure relief port is connected to the cavity, and the sealing section is used to isolate the pressure relief port and the cavity.

3. The battery device according to claim 1 or 2, characterized in that, The piston is configured to move toward the valve cover when the gas pressure inside the housing is greater than or equal to the opening pressure value set by the explosion-proof valve, and the sealing membrane deforms.

4. The battery device according to any one of claims 1-3, characterized in that, The sealing section includes a main body section and at least one rib connected to the side of the main body section away from the valve cover. The rib is arranged around the outlet of the pressure relief channel and abuts against the valve body.

5. The battery device according to claim 4, characterized in that, In its natural state, the inner diameter of the rib gradually increases from the end connected to the main body section to the end abutting against the valve body, and the angle between the inner sidewall of the rib and the main body section is an obtuse angle, while the angle between the outer sidewall of the rib and the main body section is an acute angle.

6. The battery device according to claim 4 or 5, characterized in that, The sealing section includes a plurality of spaced-apart ribs, which are concentrically arranged.

7. The battery device according to any one of claims 1-6, characterized in that, The sealing membrane includes a first segment, a second segment, and a sealing segment connected in sequence. The first segment is fixed to the valve body and is closer to the valve cover than the sealing segment. The second segment is inclined.

8. The battery device according to claim 7, characterized in that, The second segment forms an opening, the width of which gradually increases from the end near the pressure relief channel to the end away from the pressure relief channel.

9. The battery device according to claim 7 or 8, characterized in that, The vertical section of the second segment includes multiple arc segments, and the curvature centers of two adjacent arc segments are located on both sides of the second segment.

10. The battery device according to any one of claims 7-9, characterized in that, The valve body defines a first mounting groove on the side near the valve cover, and the first segment is mounted in the first mounting groove and elastically compressed between the valve cover and the valve body.

11. The battery device according to any one of claims 1-10, characterized in that, The sealing membrane further includes a limiting boss that protrudes from the sealing section toward the valve cover, and a limiting groove is defined between the limiting boss and the sealing section, with at least a portion of the piston mounted in the limiting groove.

12. The battery device according to claim 11, characterized in that, The sealing membrane also includes an extension that extends from the limiting boss toward the center of the valve body so that the extension, the limiting boss, and the sealing section enclose the edge of the piston.

13. The battery device according to claim 12, characterized in that, The elastic element is elastically compressed between the valve cover and the extension.

14. The battery device according to claim 13, characterized in that, The piston includes a protrusion that protrudes toward the valve cover, and a second mounting groove is formed between the protrusion, the limiting boss and the extension. The end of the elastic member facing away from the valve cover abuts against the bottom wall of the second mounting groove.

15. The battery device according to any one of claims 1-14, characterized in that, The valve cover is provided with multiple buckles spaced apart circumferentially, and the valve body is provided with multiple slots that correspond one-to-one with the multiple buckles and engage with them.

16. The battery device according to any one of claims 1-15, characterized in that, The explosion-proof valve also includes: A nut and a first seal are provided, the nut being threaded to the outer surface of the valve body, the valve body defining a third mounting groove for mounting the first seal, the third mounting groove facing the nut, and a gap being formed between the nut and the first seal for clamping the housing.

17. The battery device according to any one of claims 1-16, characterized in that, The explosion-proof valve also includes: The second seal is installed in the fourth mounting groove formed on the outer periphery of the valve body.

18. The battery device according to any one of claims 1-17, characterized in that, The valve body, the valve cover, the sealing membrane, and the piston are all made of plastic.

19. An explosion-proof valve, characterized in that, include: The valve body forms a pressure relief channel and a pressure relief port; Valve cover, installed on the valve body; A sealing membrane is installed between the valve body and the valve cover to isolate the pressure relief channel and the pressure relief port, and has a sealing section for sealing with the valve body; A piston is disposed within the valve body, and the sealing section is sandwiched between the piston and the valve body, with the piston facing the pressure relief channel; An elastic element, 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.

20. An energy storage device, characterized in that, include: The battery device as described in any one of claims 1-18.

21. An electrical appliance, characterized in that, include: The battery device as described in any one of claims 1-18.

Images