Battery device and electric device

Abstract

The utility model relates to the technical field of battery sealing, and discloses a battery device and a power utilization device, the battery device comprises a box body, a battery monomer and a pressure relief assembly; an accommodating space is defined in the box body, and the battery monomers are accommodated in the accommodating space; the pressure relief assembly comprises a pressure relief valve and an elastic piece, and the pressure relief valve is arranged on the box body and used for relieving pressure when the pressure of the containing space exceeds a threshold value; the pressure release valve is provided with an air inlet end and an air outlet end, the elastic piece covers at least part of the air outlet end, and a valve element of the pressure release valve is configured to make contact with the elastic piece at least when the pressure exceeds a threshold value; the elastic piece is provided with a plurality of filtering holes and is configured to be capable of being unfolded when the pressure of the containing space exceeds a threshold value, and gas is exhausted out of the box body through the elastic piece. By means of the pressure release valve, foreign matter can be effectively prevented from seeping into the pressure release valve, and the dustproof requirement of the pressure release valve is met. The risk of sealing failure of the sealing interface of the valve body under severe working conditions can be avoided through expansion and reset contraction of the elastic piece during pressure relief, and the reliability of the battery device is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to battery devices and power-consuming devices. Background Technology

[0002] New energy batteries are being used more and more widely in daily life and industry. For example, new energy vehicles equipped with batteries are already widely used. In addition, batteries are being used more and more in the field of energy storage.

[0003] In battery-powered new energy vehicles, batteries can provide all or part of the power. In the energy storage field, batteries can be installed in energy storage enclosures or directly on the user side. In these application scenarios, there is a risk of failure of the dust seal interface of the pressure relief valve of the battery device, affecting the normal venting and pressure relief of the valve. Therefore, how to improve the dust seal capability of the pressure relief valve is one of the research topics in the industry. Utility Model Content

[0004] To solve the above-mentioned technical problems, this application provides a battery device and an electrical device.

[0005] This application is achieved through the following technical solution.

[0006] A first aspect of this application discloses a battery device, the battery device including a housing, battery cells, and a pressure relief assembly; the housing defines a receiving space, and the battery cells are housed in the receiving space; the pressure relief assembly includes a pressure relief valve and an elastic element, the pressure relief valve is disposed in the housing and is used to release pressure when the pressure in the receiving space exceeds a threshold; the pressure relief valve has an inlet end and an outlet end, the elastic element covers at least a portion of the outlet end, the pressure relief valve includes a valve core disposed in the outlet end, the valve core is configured to contact the elastic element at least when the pressure in the receiving space exceeds the threshold; the elastic element has a plurality of filter holes, the elastic element is configured to expand and allow gas to pass through the elastic element and exit the housing when the pressure in the receiving space exceeds the threshold.

[0007] In the technical solution of this application embodiment, since the elastic element covers the exhaust end of the pressure relief valve and has a filter hole, even under harsh working conditions with significant vibration and bumps in the coal car, it can prevent foreign objects such as dust and coal slag from seeping into the pressure relief valve, avoiding seal failure and fulfilling the dustproof requirement of the pressure relief valve. When the internal air pressure of the battery device is too high, the valve core moves to exhaust air, and the elastic element can unfold under the action of the valve core. The enlargement of the filter hole does not affect the pressure relief and exhaust. After the pressure relief is completed, the elastic element contracts and reseals the pressure relief valve. Through the cooperation between the pressure relief valve and the elastic element, the sealing interface of the valve body can be prevented from failing under harsh working conditions, improving the reliability of the battery device. In addition, since the elastic element can unfold and contract, the tensile deformation during exhaust and the contraction and reset after pressure relief will generate slight vibration, which can shake off the dust and impurities attached to the surface, achieving a self-cleaning effect, reducing the risk of blockage, and improving the long-term reliability of the pressure relief component.

[0008] In some embodiments, the elastic element is an elastic mesh.

[0009] In the technical solution of this application embodiment, the elastic mesh has a good elongation ratio and specific surface area, and the mesh shape is conducive to deformation. In the contracted state, the elastic mesh is tightly packed together, reducing the space occupied; while in the depressurization state, the elastic mesh can be quickly expanded, making the filter holes larger, the gas flow path smoother, providing an effective flow area for rapid exhaust, and improving the depressurization efficiency.

[0010] In some embodiments, the pressure relief valve includes a valve body disposed in the housing, the valve body forming an opening at the exhaust end, a valve core disposed in the opening, the valve core being configured to move relative to the valve body in a first direction to discharge gas from the housing when the pressure in the accommodating space exceeds a threshold; the elastic element is connected to at least one of the valve body and the valve core, the first direction being the direction from the intake end to the exhaust end.

[0011] In the technical solution of this application embodiment, the pressure relief valve is a piston-type pressure relief valve. Piston-type pressure relief valves are widely used. When pressure is released, the valve core can move along the first direction to protrude the opening, causing the elastic element to unfold and avoiding interference with pressure relief and exhaust. After pressure relief is completed, the valve core moves back to its original position, causing the elastic element to contract and re-seal. The deformation of the elastic mesh is driven by the mechanical movement of the valve core, resulting in high consistency of action and making the triggering and resetting of pressure relief more accurate and reliable. In addition, after the elastic element is integrated with the pressure relief valve, there is no need to set up an additional independent dustproof device, which simplifies the overall structure of the battery device, does not increase structural complexity, and reduces space occupation.

[0012] In some embodiments, along the first direction, the elastic element is disposed on the side where the exhaust end of the valve core is located, and the elastic element covers the opening.

[0013] In the technical solution of this application embodiment, since the elastic element is disposed on the side where the valve core exhaust end is located along the first direction and covers the opening of the valve body, the elastic element can form a full-circumferential dustproof barrier, completely blocking the exhaust opening and effectively preventing dust from seeping into the sealing interface between the valve core and the valve body from the edge of the opening; when depressurizing, since the elastic element is located outside the valve core, it will not interfere with the movement of the valve core. The valve core can move along the first direction under pressure to open the exhaust channel, push up and support the elastic element, expand the filter hole, increase the exhaust area, and facilitate normal depressurization.

[0014] In some embodiments, the pressure relief assembly includes a retaining ring sleeved on the outer periphery of the valve body and connected to the valve body, and the elastic element is disposed between the retaining ring and the valve body along the radial direction of the retaining ring.

[0015] In the technical solution of this application embodiment, since a fixing ring is provided on the outer periphery of the valve body, and the elastic element is located between the fixing ring and the valve body, the fixing ring and the valve body can be detachably connected by means of threaded connection, snap-fit ​​connection, etc., or fixedly connected. Through the clamping action of the fixing ring and the valve body, the elastic element is fixed between the fixing ring and the valve body, preventing loosening and displacement due to vibration, exhaust impact, etc., thus improving the stability of the dustproof effect; and facilitating the later disassembly and assembly of the fixing ring to replace the elastic element or clean dust, reducing maintenance difficulty and cost.

[0016] In some embodiments, the retaining ring includes a magnetic suction portion configured to be magnetically connected to the valve body, and the elastic element is configured to be fixed to the magnetic suction portion and / or the valve body under the magnetic attraction of the magnetic suction portion.

[0017] In the technical solution of this application embodiment, since the fixing ring is magnetically connected to the valve body through the magnetic part, the fixing ring can be adsorbed and separated without additional tools, which is convenient and efficient, improves maintenance convenience and efficiency, and flexibly meets the needs of different usage scenarios; moreover, the magnetic connection has no mechanical wear, and can maintain a stable connection force even after long-term use, avoiding the aging and failure problem of traditional mechanical connection and improving connection reliability.

[0018] In some embodiments, there is an annular gap between the valve core and the valve body, which is projected along the first direction onto a projection plane perpendicular to the first direction, and the projection of the elastic element overlaps with the projection of the annular gap.

[0019] In the technical solution of this application embodiment, since the projection of the elastic element overlaps with the annular gap, the elastic element can accurately cover the annular gap, preventing dust from entering the sealing interface between the valve core and the valve body, thus avoiding seal failure. In addition, the elastic element is housed in the valve body, so that the pressure relief component does not occupy additional external space, avoiding damage to the elastic element caused by external collisions, reducing external interference, and the environment in which the elastic element is located is relatively stable, which is conducive to the long-term and repeated use of the elastic element.

[0020] In some embodiments, the elastic element is integrally formed with the valve core, and / or the elastic element is integrally formed with the valve body.

[0021] In the technical solution of this application embodiment, due to the adoption of an integral molding process, the assembly gaps of the elastic components are eliminated to a certain extent. Even under harsh working conditions with significant vibration and bumps in the coal car, foreign objects such as dust and coal slag can be prevented from seeping into the valve body through the assembly gaps, thus improving the dustproof effect. Furthermore, the overall structure of the pressure relief assembly is simplified, the assembly difficulty is reduced, and the overall assembly speed of the pressure relief assembly is increased.

[0022] In some embodiments, the elastic element is a rubber elastic mesh, and the elongation of the elastic element is not less than 1 and not greater than 8.

[0023] In the technical solution of this application embodiment, since the elastic element uses a rubber elastic mesh, it has the advantages of convenient manufacturing, excellent weather resistance, and chemical stability. It is not prone to aging, cracking, or corrosion by chemical media during long-term use. The rubber elastic mesh is made of high-strength, fatigue-resistant elastic ropes woven in a diamond pattern. When the pressure is less than a preset value, it is in a contracted state. The rubber elastic mesh is breathable and can prevent coal slag, dust, etc., from entering the sealing interface of the pressure relief valve under various working conditions. When the pressure exceeds the threshold, i.e., under burst pressure, the rubber elastic mesh is expanded, allowing gas to pass quickly through the gaps between the elastic ropes. Furthermore, because the elongation is within a suitable range, it can balance the porosity required for pressure relief and the elastic limit. When the pressure exceeds the threshold, it can quickly stretch and expand, increasing the venting area to facilitate rapid pressure relief. After venting, it can smoothly shrink back to its original shape, preventing reverse sealing failure after pressure relief, which is beneficial for the long-term, repeated use of the elastic element. At the same time, it will not cause the mesh to tear or permanently deform due to excessive stretching, extending the service life of the elastic element.

[0024] In some embodiments, the mesh size of the filter holes in the elastic element is in the range of 50 to 200 mesh.

[0025] In the technical solution of this application embodiment, since the filter mesh count is within a suitable range and the pore size is related to the burst gas pressure, it can balance filtration accuracy and pressure relief efficiency. This effectively prevents impurities such as dust and slag from entering the sealing interface, protecting the pressure relief valve and enabling efficient exhaust, ultimately achieving a balance between dust prevention and exhaust functions. Furthermore, a high mesh count is suitable for protecting against fine particles in harsh environments, while a low mesh count is suitable for filtering larger particles or scenarios requiring high air permeability. Selecting the appropriate dustproof mesh count based on the specific application scenario enhances the flexibility of the pressure relief component.

[0026] In some embodiments, the threshold is in the range of 100 kPa to 200 kPa.

[0027] In the technical solution of this application embodiment, since the threshold is within a suitable range, unnecessary pressure relief frequency can be reduced, fatigue wear of elastic components can be decreased, and dust seal failure caused by frequent pressure relief can be avoided, further improving the long-term reliability of the pressure relief assembly. Furthermore, pressure relief can be triggered in time before the internal pressure reaches a dangerous level, thus effectively preventing the battery device from exploding due to excessive pressure and improving the reliability of the battery device.

[0028] A second aspect of this application provides an electrical device, which includes the battery device described in the first aspect of this application, the battery device being used to store or provide electrical energy.

[0029] The beneficial effects of this disclosure include: It prevents foreign matter such as dust and slag from seeping into the pressure relief valve, avoiding sealing failure and fulfilling the dustproof requirement of the pressure relief valve; when the internal air pressure of the battery device is too high, the elastic element can expand, and the enlarged filter hole does not affect pressure relief and exhaust; after pressure relief is completed, the elastic element contracts, resealing the pressure relief valve. By expanding and retracting the elastic element during pressure relief, the risk of sealing failure at the valve body sealing interface under harsh operating conditions can be avoided, improving the reliability of the battery device.

[0030] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0031] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0032] Figure 1These are schematic diagrams of vehicles provided in some embodiments of this application;

[0033] Figure 2 These are schematic diagrams of the battery device provided in some embodiments of this application;

[0034] Figure 3 These are schematic diagrams of the pressure relief components provided in some embodiments of this application;

[0035] Figure 4 This is an assembly diagram of the pressure relief assembly provided in some embodiments of this application;

[0036] Figure 5 This is a partial cross-sectional view of a pressure relief assembly provided in some embodiments of this application;

[0037] Figure 6 This is a schematic diagram of a pressure relief assembly in a pressure relief state provided in some embodiments of this application;

[0038] Figure 7 These are schematic diagrams of the pressure relief components provided in other embodiments of this application;

[0039] Figure 8 This is a partial cross-sectional view of a pressure relief assembly provided in some other embodiments of this application;

[0040] Figure 9 yes Figure 8 A magnified view of a section at point A in the middle;

[0041] Figure 10 This is a schematic diagram of the pressure relief assembly in a pressure relief state provided in some other embodiments of this application;

[0042] Figure 11 This is a partial cross-sectional view of a pressure relief assembly in a pressure relief state provided in some other embodiments of this application.

[0043] Explanation of reference numerals in the attached figures

[0044] 100. Battery assembly; 20. Housing; 10. Pressure relief assembly; 11. Pressure relief valve; 111. Air inlet; 112. Air outlet; 113. Valve body; 114. Valve core; 12. Elastic element; 13. Retaining ring; 115. Annular gap; 116. Spring; 117. Sealing ring; 200. Controller; 300. Motor; 1000. Vehicle. Detailed Implementation

[0045] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms “comprising” and “having”, and any variations thereof, in this document and the foregoing description of the accompanying drawings are intended to cover non-exclusive inclusion.

[0047] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0048] In this document, the term "embodiment" means that a particular 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 separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0049] In the description of the embodiments 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, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0050] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0051] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0052] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0053] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms "parallel" and "perpendicular" are both allowed to have a certain degree of tolerance and / or error, including cases of being approximately parallel and approximately perpendicular.

[0054] The following is a detailed description of this application.

[0055] Currently, new energy batteries are being used more and more widely in daily life and industry. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing.

[0056] In battery-powered new energy vehicles, batteries can provide all or part of the power. In the energy storage field, batteries can be installed in energy storage enclosures or directly on the user side. In these application scenarios, there is a risk of failure of the dust seal interface of the pressure relief valve of the battery device, affecting the normal venting and pressure relief of the valve. Therefore, how to improve the dust seal capability of the pressure relief valve is one of the research topics in the industry.

[0057] Through research and design, an elastic element with filter holes was integrated with the pressure relief valve. Under normal conditions, the elastic element, through the filter holes, prevents impurities such as dust and slag from entering the sealing interface of the pressure relief valve. When the pressure relief valve releases pressure, the filter holes are opened during venting, without affecting the rapid venting of the pressure relief valve. This achieves both pressure relief and venting functions of the pressure relief valve.

[0058] Based on this design concept, this application presents a battery device comprising a housing, individual battery cells, and a pressure relief assembly. The housing defines a containment space in which the individual battery cells are housed. The pressure relief assembly includes a pressure relief valve and an elastic element. The pressure relief valve is disposed within the housing and is used to release pressure when the pressure in the containment space exceeds a threshold value. The pressure relief valve has an inlet end and an outlet end. The elastic element covers at least a portion of the outlet end. The pressure relief valve includes a valve core disposed at the outlet end and is configured to contact the elastic element at least when the pressure in the containment space exceeds the threshold value. The elastic element has multiple filter holes and is configured to expand and allow gas to pass through the elastic element and exit the housing when the pressure in the containment space exceeds the threshold value.

[0059] In the technical solution of this application embodiment, since the elastic element covers the exhaust end of the pressure relief valve and has a filter hole, even under harsh working conditions with significant vibration and bumps in the coal car, it can prevent foreign objects such as dust and coal slag from seeping into the pressure relief valve, avoiding seal failure and fulfilling the dustproof requirement of the pressure relief valve. When the internal air pressure of the battery device is too high, the valve core moves to exhaust air, and the elastic element can unfold under the action of the valve core. The enlargement of the filter hole does not affect the pressure relief and exhaust. After the pressure relief is completed, the elastic element contracts and reseals the pressure relief valve. Through the cooperation between the pressure relief valve and the elastic element, the sealing interface of the valve body can be prevented from failing under harsh working conditions, improving the reliability of the battery device. In addition, since the elastic element can unfold and contract, the tensile deformation during exhaust and the contraction and reset after pressure relief will generate slight vibration, which can shake off the dust and impurities attached to the surface, achieving a self-cleaning effect, reducing the risk of blockage, and improving the long-term reliability of the pressure relief component.

[0060] In the following embodiments, for ease of explanation, a vehicle 1000 is used as an example of an electrical device according to an embodiment of this application. The description is as follows with reference to the accompanying drawings.

[0061] Figure 1 The diagram illustrates the structure of a vehicle 1000 as provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Figure 1 As shown, a battery device 100 is installed inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0062] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0063] In the embodiments of this application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0064] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0065] In some embodiments, the electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0066] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0067] The emissions from battery cells mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of the separator, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0068] The battery apparatus 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 connected in series, parallel, or mixed connections via a busbar.

[0069] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; 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 a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0070] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0071] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0072] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0073] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0074] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0075] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0076] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0077] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0078] Below, refer to Figures 2 to 11 Some embodiments of this application will be described in detail.

[0079] Figure 1 These are schematic diagrams of vehicles provided in some embodiments of this application; Figure 2 These are schematic diagrams of the battery device provided in some embodiments of this application; Figure 3 These are schematic diagrams of the pressure relief components provided in some embodiments of this application; Figure 4 This is an assembly diagram of the pressure relief assembly provided in some embodiments of this application; Figure 5 This is a partial cross-sectional view of a pressure relief assembly provided in some embodiments of this application; Figure 6 This is a schematic diagram of the pressure relief state of the pressure relief assembly provided in some embodiments of this application; Figure 7 These are schematic diagrams of the pressure relief components provided in other embodiments of this application; Figure 8 This is a partial cross-sectional view of a pressure relief assembly provided in some other embodiments of this application; Figure 9 yes Figure 8 A magnified view of a section at point A in the middle; Figure 10 This is a schematic diagram of the pressure relief state of the pressure relief assembly provided in some other embodiments of this application; Figure 11 This is a partial cross-sectional view of a pressure relief assembly provided in some other embodiments of this application.

[0080] In some embodiments of this application, for ease of explanation, a first direction and a second direction are defined, wherein the first direction and the second direction are intersecting each other; here, intersecting each other includes perpendicularly intersecting each other. For ease of understanding of the embodiments of this application, Figures 2 to 3 are provided. Figure 11In the illustrated embodiments, the example is given where the first direction and the second direction are perpendicular to each other. However, those skilled in the art should understand that the embodiments of this application are not limited to the case where the two directions are perpendicular. For ease of explanation, as shown by the arrows in Figures 2 to 11, the direction where arrow Y is located is the first direction, and the direction where arrow X is located is the second direction.

[0081] The first aspect of this application discloses a battery device 100. In this embodiment, the battery device 100 includes a housing 20, a battery cell, and a pressure relief assembly 10. The housing 20 defines a receiving space, in which the battery cell is housed. The pressure relief assembly 10 includes a pressure relief valve 11 and an elastic member 12. The pressure relief valve 11 is disposed in the housing 20 and is used to relieve pressure when the pressure in the receiving space exceeds a threshold. The pressure relief valve 11 has an inlet end 111 and an outlet end 112. The elastic member 12 covers at least a portion of the outlet end 112. The pressure relief valve 11 includes a valve core 114, which is disposed in the outlet end 112. The valve core 114 is configured to contact the elastic member 12 at least when the pressure in the receiving space exceeds the threshold. The elastic member 12 has a plurality of filter holes and is configured to expand and allow gas to pass through the elastic member 12 and exit the housing 20 when the pressure in the receiving space exceeds the threshold.

[0082] It is understood that in this embodiment of the application, the battery device 100 is a battery pack. The battery device 100 includes multiple battery cells for storing electrical energy, and the battery cells are also physically protected by the housing 20.

[0083] Optionally, the material of the housing 20 can be alloy materials such as aluminum alloy or iron alloy, polymer materials such as polycarbonate or polyisocyanurate foam, or composite materials such as glass fiber and epoxy resin.

[0084] Optionally, the enclosure 20 includes at least a frame and a base plate, with the frame arranged around the edge of the base plate and defining an accommodating space.

[0085] Alternatively, the frame can be made of a metal material with a certain strength. This application does not limit the method of forming the frame.

[0086] Optionally, the shape of the border may include, but is not limited to, a rectangular structure, a circular structure, a triangular structure, a pentagonal structure, a hexagonal structure, a rhombus structure, or an elliptical structure. Accordingly, the shape of the defined accommodating space matches the shape of the border.

[0087] Understandably, the pressure relief valve 11, also known as an explosion-proof valve or explosion-proof pressure relief valve, is a device for rapid pressure relief. The pressure relief valve 11 can be installed in the battery device 100 and can quickly open the valve body after the internal pressure of the battery device 100 reaches a certain threshold, so as to discharge the high-pressure gas or other emissions from the battery device 100, reduce the impact of thermal runaway, and avoid more serious hazards.

[0088] For example, such as Figure 2 As shown, the pressure relief valve 11 is installed on the side of the housing 20.

[0089] Optionally, the pressure relief valve 11 can be a piston-type pressure relief valve, or a pin-type, rupture disc-type, or lever-type valve, etc.

[0090] Exemplarily, this application embodiment mainly uses a piston-type pressure relief valve as an example for description. Piston-type pressure relief valves have the advantages of high temperature resistance, rapid response, and the ability to reset after pressure drop via a return spring 116 or its own structure, and are reusable. In contrast, rupture disc-type pressure relief valves are disposable and must be replaced after operation.

[0091] Understandably, the valve core 114 of the pressure relief valve 11 can move during pressure relief.

[0092] Optionally, the valve core 114 may contact the elastic element 12 before depressurization (before the pressure in the containment space exceeds the threshold) or during depressurization (when the pressure in the containment space exceeds the threshold).

[0093] For example, such as Figure 7 , Figure 8 , Figure 9 As shown, the valve core 114 is in contact with and connected to the elastic element 12 under normal conditions, and in the depressurization state ( Figure 10 The elastic element 12 contacts the valve core 114 and is driven to unfold by it.

[0094] For example, such as Figure 3 , Figure 6 As shown, when the valve core 114 is in the depressurization state, the elastic element 12 contacts the valve core 114 and is lifted up and unfolded by it.

[0095] Understandably, the pressure relief valve 11 of the battery device 100 needs to have good sealing performance because it connects the inside and outside of the battery device 100. The battery device 100 can be installed as a power source in electrical devices, such as a vehicle 1000. During the long-term operation of the vehicle 1000, external dust, powder, slag, particulate matter, foreign objects, etc., can easily accumulate at the opening gap of the pressure relief valve 11. There is a risk that dust may transfer to the sealing interface inside the valve, causing damage to the sealing performance of the pressure relief valve 11.

[0096] Optionally, the pressure relief valve 11 is disposed in the through mounting hole of the frame, which connects the internal containment space of the battery device 100 with the external environment when the pressure is released. The side closer to the containment space is the air inlet 111 and the other side is the exhaust end 112.

[0097] Optionally, the pressure relief assembly 10 may also include a pressure sensor for actively monitoring the pressure in the containment space.

[0098] It is understood that the elastic element 12 with filter holes in the embodiments of this application refers to a flexible component with a porous structure, which has recoverable elastic deformation capability and can perform two dynamic deformations: contraction and expansion (stretching). It blocks impurities through filter holes and adapts to the working conditions of the two pressure relief valves 11 for dust prevention and pressure relief and exhaust through deformation.

[0099] It is understood that the elastic element 12 at least partially covers the exhaust end 112 of the pressure relief valve 11, that is, the elastic element 12 can cover the exhaust area or the entire area of ​​the exhaust end 112, and can prevent impurities from entering the valve body from the exhaust end 112.

[0100] Optionally, the material of the elastic element 12 may be silicone elastic element 12, polyurethane elastic element 12, or fluororubber elastic element 12.

[0101] Optionally, the elastic element 12 can be made of silicone, polyurethane, rubber, fluororubber, polyester elastomer, etc.

[0102] Optionally, the elastic element 12 can be an elastic mesh or an elastic film.

[0103] It is understandable that the filter holes refer to the tiny pores opened on the elastic element 12, with the pore size matching the particle size of impurities in the working conditions, while also taking into account the gas flow efficiency.

[0104] Understandably, in the unfolded state, the filter holes are stretched synchronously, and the pores expand; the gas first passes through the internal channel of the pressure relief valve 11, then through the filter holes of the elastic element 12, and finally exits the housing 20.

[0105] Optionally, the number of filter holes is not limited in the embodiments of this application, as long as it does not affect the exhaust after being expanded.

[0106] Optionally, the filter holes can be arranged in an array or randomly distributed.

[0107] Optionally, the shape of the filter holes can be round, diamond-shaped, or square.

[0108] For example, the diamond-shaped holes can be formed by a weaving process, and the pores can expand synchronously when the elastic element 12 is stretched or unfolded, and the pores become dense when it shrinks.

[0109] As another example, the circular hole is formed by a punching process, resulting in smoother edges that are less prone to breakage due to friction from impurities.

[0110] It is understandable that the elastic element 12 is configured to have two forms:

[0111] Protective contraction state: When the pressure difference between the inside and outside of the housing 20 does not exceed the threshold, the elastic element 12 is in a state of natural contraction or pre-compression. At this time, the filter holes become smaller due to the contraction of the elastic element 12, effectively blocking external dust from passing through in conjunction with its own pore size.

[0112] Depressurization Deployment State: When pressure relief is required, the airflow impact and / or the movement of the valve core 114 connected to it forces the elastic element 12 to overcome its elastic force and undergo tensile deformation. At this time, the filter holes open, the total permeable area increases sharply, forming a low-flow-resistance exhaust channel, which does not affect the normal pressure relief of the pressure relief valve 11.

[0113] Understandably, the elasticity and stretching properties of the elastic element 12 enable it to have a self-cleaning function. During the high-pressure gas discharge process, the dust can be automatically shaken off by the impact force of the airflow and the elasticity of the elastic element 12.

[0114] In the technical solution of this application embodiment, since the elastic element 12 covers the exhaust end 112 of the pressure relief valve 11 and has a filter hole, even under harsh working conditions with significant vibration and bumps in the coal car, it can prevent foreign objects such as dust and coal slag from seeping into the pressure relief valve 11, avoiding sealing failure and fulfilling the dustproof requirement of the pressure relief valve 11. When the internal air pressure of the battery device 100 is too high, the elastic element 12 can expand, and the enlarged filter hole does not affect the pressure relief and exhaust. After the pressure relief is completed, the elastic element 12 contracts and reseals the pressure relief valve 11. Through the cooperation of the pressure relief valve 11 and the elastic element 12, the sealing failure of the valve body sealing interface under harsh working conditions can be avoided, improving the reliability of the battery device 100. In addition, since the elastic element 12 can expand and contract, the tensile deformation during exhaust and the contraction and reset after pressure relief will generate slight vibration, which can shake off the dust and impurities attached to the surface, achieving a self-cleaning effect, reducing the risk of blockage, and improving the long-term reliability of the pressure relief assembly 10.

[0115] In the embodiments of this application, the elastic element 12 is an elastic mesh.

[0116] It is understood that elastic mesh refers to a mesh-like elastic element 12 formed by weaving or molding processes.

[0117] Alternatively, the elastic mesh can be made of metal, rubber, or thermoplastic elastomer.

[0118] Optionally, the weaving method of the elastic mesh can be divided into plain weave, twill weave, and diamond weave. The filter holes are the mesh openings.

[0119] For example, when the diamond-woven elastic mesh is stretched, the mesh expands in a diamond shape and can be unfolded simultaneously along the radial and axial directions of the hole, making the deformation direction more flexible and adapting to the movement of the valve core 114 of the pressure relief valve 11.

[0120] For example, the plain weave elastic mesh structure is dense and has a good dustproof effect.

[0121] In the technical solution of this application embodiment, the elastic mesh has a good elongation ratio and specific surface area, and the mesh shape is conducive to deformation. In the contracted state, the elastic mesh is tightly packed together, reducing the space occupied; while in the depressurization state, the elastic mesh can be quickly expanded, making the filter holes larger, the gas flow path smoother, providing an effective flow area for rapid exhaust, and improving the depressurization efficiency.

[0122] In an embodiment of this application, the pressure relief valve 11 includes a valve body 113 and a valve core 114. The valve body 113 is disposed in the housing 20, and the valve body 113 forms an opening at the exhaust end 112. The valve core 114 is disposed in the opening. The valve core 114 is configured to move relative to the valve body 113 in a first direction (Y) when the pressure in the containment space exceeds a threshold, thereby discharging gas from the housing 20. The elastic member 12 is connected to at least one of the valve body 113 and the valve core 114. The first direction (Y) is the direction from the air inlet end 111 to the exhaust end 112.

[0123] It should be noted that the pressure relief valve 11 in this embodiment refers to a piston-type pressure relief valve 11, with the valve body 113 fixed to the housing 20 and the valve core 114 (piston) disposed in the opening of the valve body 113.

[0124] For example, such as Figure 2 , Figure 3 , Figure 7 As shown, valve body 113 is the main body of pressure relief valve 11, which is installed on housing 20 and has a circular opening for pressure relief.

[0125] Optionally, the valve body 113 can be fixed to the housing 20 by bolting, welding, riveting, bonding, etc.

[0126] For example, the valve body 113 is fixed to the housing 20 by bolts, such as Figure 2 , Figure 5 , Figure 11 As shown, the valve body 113 has bolt holes. The two bolt holes are located on both sides of the valve body 113 along the second direction (X). The second direction (X) is perpendicular to the first direction (Y) and is an open radial direction.

[0127] Understandably, valve core 114 is a piston that opens or closes the pressure relief passage by moving axially.

[0128] It is understandable that, in addition to the valve body and valve core 114, the pressure relief valve 11 may also include a spring 116, a sealing ring 117, etc.

[0129] For example, such as Figure 5 , Figure 8 , Figure 11 As shown, the spring 116 abuts between the valve core 114 and the valve body 113 to drive the valve core 114 to reset through elastic force, and seal the receiving space after the pressure is released.

[0130] For example, the sealing ring 117 is disposed in the sealing groove of the valve body 113.

[0131] For example, such as Figure 5 , Figure 8 , Figure 11 As shown, the pressure relief valve 11 may be equipped with multiple sealing rings 117.

[0132] Understandably, when the pressure in the containment space exceeds a threshold, the internal pressure pushes the valve core 114 toward the external environment (the side where the exhaust end 112 is located), thus connecting the inside and outside. After the exhaust is completed, the valve core 114 is reset by the action of components such as the spring 116.

[0133] Understandably, the pressure relief threshold can be adjusted by changing the spring force of spring 116.

[0134] In the technical solution of this application embodiment, the pressure relief valve 11 is a piston-type pressure relief valve, which is widely used. When pressure is released, the valve core 114 can move along the first direction (Y) to protrude the opening, causing the elastic element 12 to unfold, thus avoiding interference with pressure relief and exhaust. After pressure relief is completed, the valve core 114 moves back to its original position, causing the elastic element 12 to contract and re-seal. The deformation of the elastic mesh is driven by the mechanical movement of the valve core 114, resulting in high consistency of action and making the triggering and resetting of pressure relief more accurate and reliable. In addition, after the elastic element 12 is integrated with the pressure relief valve 11, there is no need to set up an additional independent dustproof device, which simplifies the overall structure of the battery device 100, does not increase structural complexity, and reduces space occupation.

[0135] In the embodiments of this application, along the first direction (Y), the elastic element 12 is disposed on the side where the exhaust end 112 of the valve core 114 is located, and the elastic element 12 covers the opening.

[0136] Optionally, the shape of the elastic element 12 matches the shape of the opening. For example, when the opening is a triangle, rectangle, or other polygon, the elastic element 12 can be a triangle, rectangle, or other polygon.

[0137] For example, the elastic element 12 has a circular shape and an opening shape.

[0138] For example, such as Figure 3 , Figure 4 , Figure 5 As shown, the projection of the valve core 114 perpendicular to the first direction (Y) falls within the projection of the elastic member 12.

[0139] For example, such as Figure 6 As shown, the elastic element 12 completely covers the opening. When the valve core 114 moves (lifts up) along the first direction (Y) toward the side where the exhaust end 112 is located, the center of the elastic element 12 is also lifted up, and the other parts unfold.

[0140] It is understandable that the outer periphery of the elastic element 12 is fixedly or detachably connected to the valve body 113 so that the elastic element 12 will not detach from the valve body 113 when the valve core 114 moves.

[0141] It is understandable that the size of the filter holes may not all be the same after the elastic element 12 is unfolded. Figure 6 The filter holes have been omitted.

[0142] In the technical solution of this application embodiment, since the elastic member 12 is disposed on the side where the exhaust end 112 of the valve core 114 is located along the first direction (Y) and covers the opening of the valve body 113, the elastic member 12 can form a full-circumferential dustproof barrier, completely blocking the exhaust opening and effectively preventing dust from seeping into the sealing interface between the valve core 114 and the valve body 113 from the edge of the opening. When depressurizing, since the elastic member 12 is located outside the valve core 114, it will not interfere with the movement of the valve core 114. The valve core 114 can move along the first direction (Y) under pressure to open the exhaust channel, push up and open the elastic member 12, so that the filter hole is enlarged and the exhaust area is enlarged, which is conducive to normal depressurization.

[0143] In the embodiments of this application, the pressure relief assembly 10 includes a fixing ring 13, which is sleeved on the outer periphery of the valve body 113 and connected to the valve body 113. Along the radial direction of the fixing ring 13, an elastic element 12 is partially disposed between the fixing ring 13 and the valve body 113.

[0144] For example, the retaining ring 13 refers to an annular component used to fix the elastic member 12, which is sleeved on the outer periphery of the valve body 113 and clamps the edge of the elastic member 12 by cooperating with the valve body 113.

[0145] Optionally, the retaining ring 13 and the valve body 113 can be detachably connected or fixedly connected.

[0146] Alternatively, detachable connection methods can be divided into threaded connection, snap-fit ​​connection, and magnetic connection.

[0147] Alternatively, the fixed connection can be a connection method such as adhesive bonding.

[0148] For example, such as Figure 4 , Figure 5As shown, the inner side of the retaining ring 13 has an internal thread, and the valve body 113 has an external thread that mates with the internal thread. The two are threadedly connected, and the elastic element 12 is clamped by the internal and external threads. The threaded connection has high strength and is suitable for scenarios with frequent vibration, such as passenger cars.

[0149] As another example, the retaining ring 13 and the valve body 113 are connected by a snap-fit. One of them is designed with a snap-fit, and the other has a slot to form a snap-fit ​​connection. The snap-fit ​​connection allows for quick assembly and disassembly, making it suitable for scenarios requiring frequent maintenance, such as commercial vehicles.

[0150] In the technical solution of this application embodiment, since a fixing ring 13 is provided on the outer periphery of the valve body 113, and the elastic element 12 is located between the fixing ring 13 and the valve body 113, the fixing ring 13 and the valve body 113 can be detachably connected by means of threaded connection, snap connection, etc. Through the clamping action of the fixing ring 13 and the valve body 113, part of the elastic element 12 is fixed between the fixing ring 13 and the valve body 113, avoiding loosening and displacement due to factors such as vibration and exhaust impact, thus improving the stability of the dustproof effect; and it is convenient to disassemble and install the fixing ring 13 later to replace the elastic element 12 or clean the dust, reducing maintenance difficulty and cost.

[0151] In the embodiments of this application, the fixing ring 13 includes a magnetic part, which is configured to be magnetically connected to the valve body 113, and the elastic member 12 is configured to be fixed to the magnetic part and / or the valve body 113 under the magnetic attraction of the magnetic part.

[0152] For example, the retaining ring 13 may be made of a permanent magnet, and the valve body 113 may be made of an iron or nickel alloy, with the two magnetically connected.

[0153] In the technical solution of this application embodiment, since the fixing ring 13 is magnetically connected to the valve body 113 through the magnetic part, the fixing ring 13 can be adsorbed and separated without additional tools. The operation is convenient and efficient, improving the convenience and efficiency of maintenance, and flexibly meeting the needs of different usage scenarios. Moreover, the magnetic connection has no mechanical wear and can maintain a stable connection force even after long-term use, avoiding the aging and failure problem of traditional mechanical connections and improving the reliability of the connection.

[0154] In the embodiments of this application, there is an annular gap 115 between the valve core 114 and the valve body 113, which is projected along the first direction (Y) onto a projection plane perpendicular to the first direction (Y), and the projection of the elastic member 12 overlaps with that of the annular gap 115.

[0155] It should be noted that the annular gap 115 refers to the annular space formed between the valve core 114 and the valve body 113. It is the channel for gas to flow from the inlet end 111 to the outlet end 112. In addition, it can also serve as a clearance to prevent the valve core 114 from mating with the valve body 113 when it moves.

[0156] It is understandable that when the elastic element 12 and the annular gap 115 are projected along the first direction (Y) onto a plane perpendicular to the first direction (Y), their projection areas overlap, thus preventing dust from entering the sealing interface from the annular gap 115.

[0157] In this embodiment, the shape of the elastic member 12 housed in the annular gap 115 is not limited; the elastic member 12 may or may not be folded.

[0158] For example, such as Figure 7 , Figure 8 , Figure 9 As shown, the elastic element 12 is housed in the annular gap 115.

[0159] For example, such as Figure 10 As shown, when the valve core 114 is depressurized and the gas is discharged, the opening protrudes, the elastic element 12 unfolds, and the filter hole enlarges, so that the gas can pass through the elastic element 12 and flow out of the housing 20.

[0160] In the technical solution of this application embodiment, since the projection of the elastic element 12 overlaps with the annular gap 115, the elastic element 12 can accurately cover the annular gap 115, preventing dust from entering the sealing interface between the valve core 114 and the valve body 113, thus avoiding sealing failure. In addition, the elastic element 12 is housed inside the valve body 113, so that the pressure relief assembly 10 does not occupy additional external space, avoiding damage to the elastic element 12 caused by external collisions, reducing external interference, and the environment in which the elastic element 12 is located is relatively stable, which is conducive to the long-term and repeated use of the elastic element 12.

[0161] In the embodiments of this application, the elastic element 12 is integrally formed with the valve core 114, and / or the elastic element 12 is integrally formed with the valve body 113.

[0162] For example, the outer side of the elastic member 12 is integrally formed with the valve body 113, and the inner side of the elastic member 12 is fixed to the valve core 114 by snap-fit.

[0163] As another example, the inner side of the elastic element 12 is integrally formed with the valve core 114, and the outer side of the elastic element 12 is snapped and fixed to the inner wall of the valve body 113.

[0164] As another example, the elastic element 12 is integrally formed with the valve body 113 and the valve core 114 and is fixed by injection molding.

[0165] Optionally, when the elastic element 12 is snapped and fixed to the valve body 113 or the valve core 114, a slot can be opened on the valve body 113 or the valve core 114, and the elastic element 12 is fixed to the bottom or wall of the slot.

[0166] In the technical solution of this application embodiment, due to the adoption of an integral molding process, the assembly gap of the elastic element 12 is eliminated to a certain extent. Even under harsh working conditions with a lot of vibration and bumps in the coal car, foreign objects such as dust and coal slag can be prevented from seeping into the valve body through the assembly gap, thus improving the dustproof effect. Furthermore, the overall structure of the pressure relief assembly 10 is simplified, the assembly difficulty is reduced, and the overall assembly speed of the pressure relief assembly 10 is increased.

[0167] In the embodiments of this application, the elastic element 12 is a rubber elastic mesh, and the elongation of the elastic element 12 is not less than 1 and not greater than 8.

[0168] It is understandable that rubber elastic mesh refers to a mesh elastic element 12 made of rubber as the base material, which combines the high elasticity and fatigue resistance of rubber with the air permeability of the mesh structure.

[0169] Optionally, the substrate of the rubber elastic mesh can be natural rubber, nitrile rubber, fluororubber, silicone rubber, etc.

[0170] It should be noted that the elongation rate in the embodiments of this application refers to the ratio of the maximum elongation of the elastic element 12 before it breaks to its original length.

[0171] Optionally, the elongation can be any one of the following values, or any value between any two of these values: 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0.

[0172] For example, if the original length of the elastic element 12 is 10mm and the elongation is 5.0, it can be stretched to a maximum of 60mm and stretched to 30mm when depressurizing, which can meet the normal venting requirements; if the elongation is 8.0, it can be stretched to a maximum of 90mm, which is suitable for large-diameter pressure relief valve 11.

[0173] In the technical solution of this application embodiment, since the elastic element 12 is made of rubber elastic mesh, it has the advantages of easy manufacturing, excellent weather resistance, and chemical stability. It is not prone to aging, cracking, or corrosion by chemical media during long-term use. The rubber elastic mesh is made of high-strength, fatigue-resistant elastic ropes woven in a diamond pattern. When the pressure is less than a preset value, it is in a contracted state. The rubber elastic mesh is breathable and can prevent coal slag, dust, etc., from entering the sealing interface of the pressure relief valve 11 under various working conditions. When the pressure exceeds the threshold, i.e., under burst pressure, the rubber elastic mesh is expanded, allowing gas to pass quickly through the gaps between the elastic ropes. Furthermore, because the elongation is within a suitable range, it can balance the porosity required for pressure relief and the elastic limit. When the pressure exceeds the threshold, it can quickly stretch and expand, increasing the venting area to facilitate rapid pressure relief. After venting, it can smoothly shrink back to its original shape, preventing reverse sealing failure after pressure relief, which is beneficial for the long-term, repeated use of the elastic element 12. At the same time, it will not cause the mesh to tear or permanently deform due to excessive stretching, extending the service life of the elastic element 12.

[0174] In the embodiments of this application, the mesh size of the filter holes of the elastic element 12 is in the range of 50 to 200 mesh.

[0175] It should be noted that 50 mesh corresponds to a filter pore size of approximately 270μm, and 200 mesh corresponds to approximately 75μm. That is, the filter pore size is between 75 and 270μm when not subjected to external force.

[0176] Optionally, the mesh count can be any one of the following values, or any value between any two of these values: 50 mesh, 55 mesh, 60 mesh, 65 mesh, 70 mesh, 75 mesh, 80 mesh, 85 mesh, 90 mesh, 95 mesh, 100 mesh, 105 mesh, 110 mesh, 115 mesh, 120 mesh, 125 mesh, 130 mesh, 135 mesh, 140 mesh, 145 mesh, 150 mesh, 155 mesh, 160 mesh, 165 mesh, 170 mesh, 175 mesh, 180 mesh, 185 mesh, 190 mesh, 195 mesh, 200 mesh.

[0177] In the technical solution of this application embodiment, since the filter mesh size is within a suitable range and the pore size is related to the burst gas pressure, it can balance filtration accuracy and pressure relief efficiency. This effectively blocks dust, slag, and other impurities from entering the sealing interface, protecting the pressure relief valve 11 and enabling efficient exhaust, ultimately achieving a balance between dust prevention and exhaust functions. Furthermore, a high mesh size is suitable for protecting against fine particles in harsh environments, while a low mesh size is suitable for filtering larger particles or scenarios requiring high air permeability. Selecting the appropriate dustproof mesh size based on the specific application scenario enhances the flexibility of the pressure relief component 10.

[0178] In the embodiments of this application, the threshold is in the range of 100 kPa to 200 kPa.

[0179] Optionally, the threshold can be any one of the following values, or any value between any two of these values: 100 kPa, 105 kPa, 110 kPa, 115 kPa, 120 kPa, 125 kPa, 130 kPa, 135 kPa, 140 kPa, 145 kPa, 150 kPa, 155 kPa, 160 kPa, 165 kPa, 170 kPa, 175 kPa, 180 kPa, 185 kPa, 190 kPa, 195 kPa, and 200 kPa.

[0180] In the technical solution of this application embodiment, since the threshold is within a suitable range, unnecessary pressure relief frequency can be reduced, fatigue wear of the elastic element 12 can be decreased, and dust seal failure caused by frequent pressure relief can be avoided, further improving the long-term reliability of the pressure relief assembly 10. In addition, pressure relief can be triggered in time before the internal pressure reaches a dangerous level, thus effectively preventing the battery device 100 from exploding due to excessive pressure and improving the reliability of the battery device 100.

[0181] The second aspect of this application provides an electrical device, which includes a battery device 100 from the first aspect of this application. The battery device 100 is used to store or provide electrical energy.

[0182] For example, the electrical device is vehicle 1000, which can be a passenger car or a commercial vehicle, such as a coal truck or a garbage truck. Figure 1 As shown, a battery device 100 is installed inside the vehicle 1000. The battery device 100 can be used to power the vehicle 1000, for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0183] In the technical solution of this application embodiment, the pressure relief component 10 has good dustproof performance. Even under harsh working conditions with a lot of vibration and bumps in the coal car, it can prevent foreign objects such as dust and coal slag from penetrating, and can avoid the sealing failure caused by coal slag and dust entering the valve body sealing interface under harsh working conditions.

[0184] The specific solutions of the embodiments of this application are described below with reference to the accompanying drawings.

[0185] In the relevant design, the pressure relief valve 11 (i.e., the explosion-proof valve) is a key safety component to prevent the battery from exploding due to excessive internal pressure. However, in the relevant technology, the sealing interface of the explosion-proof valve lacks effective dustproof function. In harsh working environments (such as scenarios with a lot of coal slag and dust), coal slag and dust can easily enter the sealing interface of the explosion-proof valve, leading to seal failure and affecting the normal function of the explosion-proof valve.

[0186] Furthermore, existing dust control measures (such as fixed dust screens or attached dust films) cannot simultaneously meet the requirements for venting and self-cleaning. When the internal pressure of the battery pack (i.e., battery device 100) exceeds the threshold, the fixed dust screen cannot effectively expand to assist in rapid venting, and is also prone to clogging due to the adhesion of slag and dust, affecting the long-term reliability of the explosion-proof valve.

[0187] In a specific embodiment, an embodiment is described where an elastic mesh is used as the elastic element 12, the filter holes are the mesh openings of the elastic mesh or the slits built into the elastic mesh made of elastic cloth / leather, and the pressure relief valve 11 is a piston-type pressure relief valve.

[0188] This embodiment provides a battery device 100, including a housing 20, a battery cell, and a pressure relief assembly 10. The housing 20 defines an accommodating space, in which the battery cell is housed. The pressure relief assembly 10 includes a pressure relief valve 11 and an elastic member 12. The pressure relief valve 11 is disposed in the housing 20 and is used to relieve pressure when the pressure in the accommodating space exceeds a threshold. The pressure relief valve 11 has an inlet end 111 and an outlet end 112. The elastic member 12 covers at least a portion of the outlet end 112. The elastic member 12 has a plurality of filter holes and is configured to expand and allow gas to pass through the elastic member 12 and exit the housing 20 when the pressure in the accommodating space exceeds the threshold.

[0189] Specifically, the filter holes can be gaps naturally formed by the diamond-shaped weave of elastic rubber bands. When contracted, the gaps are small to prevent dust and other particles from entering the valve body 113, while under high pressure burst conditions, they are stretched open to achieve rapid air permeability. Alternatively, they can be slits on the elastic cloth / sleeve itself. When contracted, they are squeezed together to form a closed state, and open under high pressure gas. The principle is similar, and the structure includes, but is not limited to, these.

[0190] Therefore, a retractable dustproof elastic mesh with pores driven by air pressure is integrated into the existing pressure relief valve 11, so as to achieve the purpose of both dust prevention in normal times and rapid exhaust in the event of explosion and pressure relief.

[0191] In this embodiment, the elastic mesh is the core component, woven from highly elastic, fatigue-resistant rubber bands that can be repeatedly stretched and contracted in a diamond pattern. The material can be silicone, polyurethane, rubber, fluororubber, polyester elastomer, etc., which not only helps maintain good performance after repeated contraction and expansion but also makes it suitable for harsh environments such as high temperature and high humidity. In summary, silicone and polyurethane are most suitable for this scenario due to their excellent performance in high temperature, high humidity, and aging resistance. For special scenarios requiring high chemical corrosion resistance, higher-cost fluororubber can be selected.

[0192] In a specific embodiment, the elastic net is composed of stretchable elastic ropes / rubber bands / cloth / rubber, etc., and is highly elastic and fatigue-resistant.

[0193] In specific embodiments, the elastic mesh has variable-size pores, and its mesh size can be adjusted according to the needs of the application scenario. For example, when the working environment of passenger cars is relatively clean, a mesh size of 50-150 can be used to filter larger particles, which can reduce costs to a certain extent and has good air permeability. For commercial vehicles, especially coal trucks and garbage trucks, where there are more impurities and greater vibration and impact in actual working conditions, a mesh size of 100-200 can be selected to effectively block and filter fine particles. Specifically, the selection of mesh size needs to be determined in combination with the actual dust filtration requirements. High mesh size is suitable for protecting fine particles in harsh environments, while low mesh size is suitable for filtering larger particles or scenarios that require high air permeability.

[0194] In specific embodiments, the required compressive expansion rate can be calculated based on different pressure relief (such as pressure relief pressure and pressure relief flow rate) and dust prevention requirements (such as dust particle size and dust prevention efficiency). Elastic nets of different materials and thicknesses can be selected to adjust their shrinkage rate in different states to meet various requirements.

[0195] In specific embodiments, the dustproof rating of this solution can reach IP5X (such as IP51, IP54, IP55), which is selected based on the specific usage scenario.

[0196] In a specific embodiment, an elastic mesh is added between the valve core 114 and the valve body 113. Even in the event of an explosion, the valve core 114 is constrained by the elastic mesh and does not completely separate from the entire package, which is beneficial for the valve body 113 to recover after depressurization.

[0197] In a specific embodiment, the elastic mesh is connected to the outer ring of the valve body 113 by a fixed retaining ring through a threaded connection, firmly fixing the elastic mesh to the valve body 113 to achieve dust prevention. Alternatively, it can be connected using integrated injection molding, internal and external magnetic ring pressing, structural adhesive, etc.; the threaded connection allows the elastic mesh to be firmly secured to the outer ring of the pressure relief valve 11, at which point the elastic mesh can perform a sealing and pre-tightening function similar to the sealing ring 117. Even in the event of a burst, the threaded connection ensures that the elastic mesh will not separate from the valve body 113, thus ensuring the reliability of the dust prevention solution; multiple connection methods such as integrated injection molding, magnetic ring pressing, and structural adhesive can more flexibly meet the needs of different application scenarios.

[0198] In a specific embodiment, the elasticity and stretching properties of the elastic mesh enable it to have a self-cleaning function. During the high-pressure gas discharge process, the impact force of the airflow and the elasticity of the mesh automatically shake off dust. This self-cleaning allows the elastic mesh structure to be reused multiple times and reduces manual cleaning and maintenance costs. Simultaneously, a hydrophobic and dust-repellent coating can be designed on the surface of the elastic mesh to reduce the adhesion of slag and dust, facilitating self-cleaning.

[0199] This embodiment provides two assembly methods for the elastic net.

[0200] In one embodiment, the elastic mesh is in a contracted state and is fixed to the outside of the valve body 113 by the fixing ring 13. When contracted, the surface is dense and the total area is small. The pores are smaller than the protective impurity particles, which can achieve dust prevention. At the same time, it does not occupy too much space and the structure is easy to assemble.

[0201] In another embodiment, the elastic mesh can also be placed inside the valve body 113, fixed between the valve body 113 and the valve core 114. In the normal contraction state, the elastic mesh is integrally injection molded to the valve core 114 and valve body 113 respectively, concealed within the pressure relief valve 11. This prevents dust and impurities from seeping into the space between the valve core 114 and valve body 113 under harsh conditions such as vibration, and avoids the problem of water vapor in the dust expanding at low temperatures, causing the valve core 114 to be pushed open and leading to the failure of the entire battery pack. This can significantly improve the safety of the battery device 100. Figure 10 , Figure 11 The image shows the elastic mesh being stretched open. At this time, the gaps become larger, allowing high-pressure gas to be quickly discharged from the larger filter holes, achieving air pressure balance. At the same time, the impact force of the airflow and the elasticity of the mesh can shake off dust and other impurities accumulated on the mesh. For applications with higher protection requirements, a hydrophobic and dust-repellent coating can be added to the surface of the elastic mesh to reduce the adhesion of slag and dust, further enhancing its self-cleaning ability.

[0202] Through the above structural design, the filter hole opens only when the internal air pressure of the battery device 100 is too high, which facilitates the rapid passage of high-pressure gas. In other cases, the filter hole is closed, which prevents air from passing through and can prevent dust. This avoids the failure of the battery device 100 under harsh working conditions and improves the reliability of the battery device 100.

[0203] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0204] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0205] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and all should be covered within the scope of protection claimed in this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of protection claimed.

Claims

1. A battery device, characterized by, The battery device comprises a box, a battery cell and a pressure relief assembly; The box defines an accommodating space therein, and the battery cell is received in the accommodating space; the pressure relief assembly comprises a pressure relief valve and an elastic member, the pressure relief valve is arranged on the box and is configured to relieve pressure when the pressure in the accommodating space exceeds a threshold value; the pressure relief valve has an air inlet end and an air outlet end, the elastic member covers at least part of the air outlet end, the pressure relief valve comprises a valve core arranged on the air outlet end, and the valve core is configured to be in contact with the elastic member at least when the pressure in the accommodating space exceeds the threshold value; the elastic member has a plurality of filter holes, and the elastic member is configured to be able to expand and allow gas to pass through the elastic member and be discharged out of the box when the pressure in the accommodating space exceeds the threshold value.

2. The battery device of claim 1, wherein The elastic member is an elastic net.

3. The battery device of claim 2, wherein, The pressure relief valve comprises a valve body arranged on the box, the valve body forms an opening at the air outlet end, the valve core is arranged in the opening, and the valve core is configured to move relative to the valve body in a first direction to allow gas to be discharged out of the box when the pressure in the accommodating space exceeds the threshold value; the elastic member is connected to at least one of the valve body and the valve core, and the first direction is a direction in which the air inlet end points to the air outlet end.

4. The battery device of claim 3, wherein In the first direction, the elastic member is arranged on a side of the valve core where the air outlet end is located, and the elastic member covers the opening.

5. The battery device of claim 4, wherein, The pressure relief assembly comprises a fixing ring, the fixing ring is sleeved on the outer periphery of the valve body and is connected to the valve body, and in the radial direction of the fixing ring, the elastic member is partially arranged between the fixing ring and the valve body.

6. The battery device of claim 5, wherein, The fixing ring comprises a magnetic attraction part configured to be magnetically connected to the valve body, and the elastic member is configured to be fixed to the magnetic attraction part and / or the valve body under the magnetic attraction of the magnetic attraction part.

7. The battery device of claim 3, wherein The valve core and the valve body have an annular gap, and in the first direction, a projection of the elastic member and the annular gap on a projection plane perpendicular to the first direction overlaps.

8. The battery device of claim 7, wherein, The elastic member is integrally formed with the valve core and / or the valve body.

9. The battery device according to any one of claims 1 to 8, characterized by, The elastic member is a rubber elastic net, and the elongation of the elastic member is not less than 1 and not more than 8.

10. The battery device according to any one of claims 1 to 8, characterized by, The mesh number of the filter holes of the elastic member is in the range of 50 to 200.

11. The battery device according to any one of claims 1 to 8, characterized by, The threshold value is in the range of 100 kPa to 200 kPa.

12. An electrical device, characterized by The battery device comprises the battery device of any one of claims 1 to 11, and is configured to store or provide electric energy.

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