Battery device and electric device

Abstract

This application discloses a battery device and an electrical device, belonging to the field of battery device technology. The battery device includes a module housing, a pressure relief assembly, and a filter element. The pressure relief assembly is connected to the module housing and includes a filter element and an explosion-proof valve. The filter element has at least two filter chambers, adjacent filter chambers are interconnected, and the filter chambers connect to the inner cavity of the module housing and the explosion-proof valve. The exhaust gas from the module housing passes through at least two filter chambers sequentially. The filter element fills the filter chamber and is used to filter the exhaust gas from the module housing. The filter elements in adjacent filter chambers have different filtration accuracies. By filtering the exhaust gas during thermal runaway through the filter assembly, the amount of smoke released into the atmosphere is reduced, the risk of re-ignition is lowered, and the safety and reliability of the battery device are improved.

Description

Technical Field

[0001] This application belongs to the field of battery device technology, specifically relating to a battery device and an electrical device. Background Technology

[0002] When any battery module in a battery device experiences thermal runaway, it is usually accompanied by a rapid increase in temperature, the emission of smoke inside the battery, fire, or even explosion, causing the fire to spread throughout the entire battery system and seriously threatening the personal and property safety of users.

[0003] In related technologies, battery devices are equipped with explosion-proof valves. In the event of thermal runaway in the battery module, high-temperature fumes inside can be discharged to the outside of the battery device through the explosion-proof valves. However, the discharged gas contains a large amount of combustible particulate matter, which poses a risk of ignition and even explosion. Utility Model Content

[0004] This application aims to provide a battery device that solves the problem that the presence of combustible particulate matter in the exhaust gas during battery thermal runaway may cause fire or even explosion.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] In a first aspect, embodiments of this application disclose a battery device, which includes a module housing, a pressure relief assembly, and a filter element. The pressure relief assembly is connected to the module housing and includes a filter assembly and an explosion-proof valve. The filter assembly has at least two filter chambers, adjacent filter chambers are interconnected, and the filter chambers connect the inner cavity of the module housing and the explosion-proof valve. The exhaust gas from the module housing passes through at least two filter chambers sequentially. The filter element fills the filter chambers and is used to filter the exhaust gas from the module housing.

[0007] The module housing is a structural component that houses multiple battery cells. The inner cavity of the module housing constitutes the main space of the battery device. The module housing not only provides installation, support and physical protection for the battery cells, but also becomes a sealed container that can withstand the rapidly rising internal temperature and pressure in the event of thermal runaway.

[0008] The pressure relief assembly is connected to the module housing, for example, by welding or bolting, thereby forming a directional pressure relief channel between the pressure relief assembly and the module housing. The filter assembly contains at least two interconnected filter chambers connected in series in the airflow path between the module housing cavity and the explosion-proof valve, ensuring that exhaust gas must pass through all filter chambers sequentially before being discharged. This multi-stage series design of the filter chambers extends the residence time of exhaust gas within the filter structure, creating conditions for sufficient adsorption of particulate matter.

[0009] Each filter chamber contains a filter element made of porous material (such as ceramic fiber, sintered metal mesh, or glass wool). The filter element intercepts particulate matter through its microporous structure. Larger particles are initially blocked by the filter element, and the emitted gas then enters the next stage of filtration through the interconnected structure between the chambers. During this process, smaller particles and liquid settle due to the stepwise decrease in flow velocity. This staged filtration mechanism significantly improves overall filtration efficiency, especially for visible smoke particles limited by the GB38031-2025 standard. Multi-stage filtration reduces the load on individual filter elements, decreasing the likelihood of clogging due to rapid particle accumulation. The explosion-proof valve is located at the end of the filtration system, making its pressure relief function less susceptible to interference from the filtration process. Filtering the emitted gas during thermal runaway reduces smoke released into the atmosphere, lowers the risk of re-ignition, and improves the safety and reliability of the battery device.

[0010] In some embodiments, the filtration accuracy of the filter elements in two adjacent filter chambers is different.

[0011] The filtration precision of the filter elements in adjacent filter chambers is configured with a gradient difference. For example, the first-stage filter chamber near the module housing uses a low-precision filter element (such as a metal mesh with a pore size of 50μm-100μm). This low-precision filter element is mainly used to intercept droplets generated by electrolyte splashing and larger debris. The final-stage filter chamber uses a high-precision filter element (such as ceramic paper with a pore size of 1μm-5μm). This high-precision filter element is used to capture toner and metal oxide particles. The first-stage low-precision filtration can efficiently remove most of the mass load. Although the subsequent small-diameter particles account for a small proportion of the mass, they are the main cause of visible smoke. The final-stage high-precision filtration specifically addresses this problem. The arrangement of the gradient filter elements reduces the probability of the high-precision filter material being prematurely clogged by large particles, extending the overall service life.

[0012] In some embodiments, at least one filter element is disposed in a filter chamber.

[0013] Multiple filter elements can be integrated within a single filter chamber to form a composite filter unit. For example, within the same filter chamber, stainless steel woven mesh, glass fiber cotton, and activated carbon felt can be arranged sequentially along the airflow direction to achieve mechanical interception, deep filtration, and chemical adsorption functions, respectively. This design is suitable for space-constrained battery devices, improving overall filtration performance without increasing the number of filter chambers. Exemplarily, the metal mesh provides initial impact protection, preventing the fiber material from being torn by high-speed airflow; the glass fiber cotton constructs a three-dimensional filter network through its disordered fiber structure to capture fine particles; and the activated carbon felt adsorbs harmful gases such as hydrogen fluoride from the emitted gas.

[0014] In some embodiments, the filter assembly includes a housing and at least one partition, the partition being located inside the housing, the at least one partition dividing the inner cavity of the housing into at least two filter chambers, the partition having a plurality of through holes communicating with adjacent filter chambers.

[0015] The outer shell serves as the main supporting structure of the filtration system. It can be made of extruded aluminum alloy or stamped stainless steel. The inner cavity of the outer shell is divided into multiple filtration chambers by at least one partition. The partition can be formed into an array of through holes by stamping or laser cutting, which connect adjacent filtration chambers.

[0016] For example, multiple through holes can be arranged with denser holes at the center and sparser holes at the edges to guide gas through the filter evenly rather than through a short-circuit flow.

[0017] In some embodiments, the filter assembly further includes a plurality of sleeves, with a first side of the explosion-proof valve facing away from the housing and a second side of the explosion-proof valve facing the housing. The plurality of sleeves are stacked inside the housing in the direction from the first side of the explosion-proof valve to the second side of the explosion-proof valve, and a partition is fixed inside each sleeve.

[0018] Each sleeve is an independent structural unit. Multiple sleeves are stacked through stepped socket or threaded connection, and sealing rings are set at the interface of adjacent sleeves to prevent gas leakage.

[0019] Standardized production of sleeves can reduce manufacturing costs, and the stacking quantity can be flexibly adjusted according to the battery device capacity, which is conducive to improving the processing and manufacturing convenience of filter components.

[0020] For example, when multiple sleeves are stacked, the total area of ​​the through holes in the inner baffle of the upstream sleeve is greater than the total area of ​​the through holes in the inner baffle of the downstream sleeve, forming a gradual throttling effect and reducing the probability of filter displacement caused by sudden airflow changes (the upstream sleeve and the downstream sleeve refer to the upstream and downstream along the exhaust direction).

[0021] In some embodiments, the filter assembly further includes a protective element connected to the housing and located inside the housing, a portion of the explosion-proof valve extending into the protective element, the protective element protecting the portion of the explosion-proof valve extending into itself, and a plurality of sleeves fitted onto the protective element.

[0022] A portion of the explosion-proof valve's structure extends into the housing, allowing for a reduction in the overall length of the pressure relief assembly. A protective element surrounds this portion of the explosion-proof valve, protecting it from structural damage.

[0023] Multiple sleeves are fitted over the protective component, with axial holes at their centers to form a through-type installation channel. The extension section of the explosion-proof valve can be embedded within these axial holes. This layout eliminates the need for the explosion-proof valve to occupy an independent axial length, allowing it to share the same spatial dimension with the filter assembly. This nested arrangement effectively reduces the size of the pressure relief assembly, which is significant for highly sensitive, thin-walled battery devices.

[0024] In some embodiments, the filter assembly further includes a protective element connected to the housing and located inside the housing, a portion of an explosion-proof valve extending into the protective element, a first side of the housing connected to the explosion-proof valve, a plurality of partitions adjacent to a second side of the housing, and the plurality of partitions located on one side of the protective element along its length.

[0025] Multiple sleeves are positioned on one side of the protective component. Each sleeve does not require a central hole, allowing for the full utilization of the sleeve's circular cross-section to arrange the filter elements. This layout enables the filter elements to meet the airflow with maximum contact area. Since the sleeves do not require a central opening, the manufacturing process is simplified, resulting in lower production costs. This solution significantly increases the effective filtration area of ​​the filter elements, thereby improving overall filtration efficiency and better meeting the stringent requirements for smoke filtration during thermal runaway of battery devices.

[0026] In some embodiments, the filter assembly further includes a cover disposed on the side of the housing opposite to the explosion-proof valve, the cover having filter holes that connect the inner cavity of the module housing and the filter cavity.

[0027] The cover can be fixed to the side of the outer shell away from the explosion-proof valve by snap-fit ​​connection or ultrasonic welding. The filter holes set on the cover can realize the primary filtration function, and the pretreatment is completed before the gas enters the filter chamber, reducing the chance of upstream filter components being blocked.

[0028] For example, the filter pores are designed as tapered channels with a larger inlet diameter and a smaller outlet diameter, forming a Venturi effect to accelerate gas flow while intercepting larger particles through friction on the inner wall of the channel.

[0029] In some embodiments, both the outer shell and the filter chamber are annular, and the outer shell has a filter hole on its side. The filter hole communicates with the filter chamber, and two adjacent filter chambers are nested together. The filter hole communicates with the inner cavity of the module housing and the filter chamber. The innermost filter chamber is connected to the explosion-proof valve.

[0030] Both the outer shell and the filter chambers employ a ring-shaped design, forming multiple concentric ring-shaped filtration areas. Filter holes are located on the side of the outer shell, allowing gas to enter radially into the outermost ring-shaped filter chamber, then sequentially pass through each adjacent ring-shaped filter chamber, finally reaching the innermost ring-shaped filter chamber and connecting with the explosion-proof valve. Adjacent filter chambers are arranged in a nested configuration, with the smaller ring-shaped filter chamber nested within the larger one. This nesting design forces the gas to traverse multiple filter layers within a limited radial space, effectively extending the filtration path. Each ring-shaped filter chamber is filled with filter material of different properties; because the gas must pass through all filter chambers sequentially, multi-stage series filtration is achieved.

[0031] Another advantage of the annular structure is the uniformity of airflow distribution. After the gas enters through the filter holes on the side of the outer shell, it naturally forms a circumferential flow within the annular filter chamber, solving the problem of dead zones that may occur in traditional straight flow. The innermost filter chamber is directly connected to the explosion-proof valve.

[0032] Secondly, this application provides an electrical device, which includes the battery device described above.

[0033] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0034] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0035] Figure 1 This is a schematic diagram of a battery device according to an embodiment of this application;

[0036] Figure 2 This is one of the schematic diagrams of a pressure relief assembly according to an embodiment of this application;

[0037] Figure 3 This is one of the exploded views of the pressure relief assembly according to an embodiment of this application;

[0038] Figure 4 This is one of the cross-sectional views of the pressure relief assembly according to an embodiment of this application;

[0039] Figure 5 This is a second schematic diagram of a pressure relief assembly according to an embodiment of this application;

[0040] Figure 6 This is a second exploded view of the pressure relief assembly according to an embodiment of this application;

[0041] Figure 7 This is a second cross-sectional view of the pressure relief assembly according to an embodiment of this application;

[0042] Figure 8 This is a third schematic diagram of a pressure relief assembly according to an embodiment of this application;

[0043] Figure 9 This is the third exploded view of the pressure relief assembly according to an embodiment of this application;

[0044] Figure 10 This is a third cross-sectional view of the pressure relief assembly according to an embodiment of this application;

[0045] Figure 11 This is a schematic diagram of an electrical device according to an embodiment of this application.

[0046] Figure label:

[0047] 100 Battery assembly, 110 Module housing, 111 Inner cavity, 120 Pressure relief assembly, 121 Filter assembly, 122 Explosion-proof valve, 123 Filter chamber, 124 Outer shell, 125 Separator, 126 Through hole, 127 Sleeve, 128 Protective component, 129 Cover, 130 Filter hole, 140 Filter component, 200 Electrical device. Detailed Implementation

[0048] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0049] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0050] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0051] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection 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.

[0052] The following is combined with Figures 1-11 This application describes a battery device and an electrical device according to embodiments thereof.

[0053] When a battery experiences thermal runaway, it is usually accompanied by a rapid increase in temperature, the emission of smoke from inside the battery, fire, or even an explosion, which seriously threatens the personal and property safety of users.

[0054] In related technologies, explosion-proof valves are used in battery devices to release internal pressure. However, the gas emitted during thermal runaway contains a large amount of combustible particles, which pose a risk of ignition and even explosion. The large amount of smoke can also cause panic among people and cannot meet the mandatory requirement of the new national standard GB38031-2025 that "there should be no visible smoke emitted during thermal runaway".

[0055] Based on the above considerations, in order to reduce the emitted smoke and decrease the risk of explosion, this application proposes a battery device that, by setting a pressure relief component with built-in filters, can actively filter the emitted gas and reduce the emission of visible smoke when the battery module experiences thermal runaway.

[0056] like Figure 11As shown, the battery device 100 disclosed in this application is mainly used in electrical devices 200 such as power battery systems for new energy vehicles and battery systems for energy storage power stations. In the field of electric vehicles, when the battery device experiences thermal runaway, the emitted gas is less likely to form visible smoke, thus reducing the risk of panic in public places. In large-scale energy storage power stations, it prevents smoke generated by battery thermal runaway from polluting the environment and reduces the risk of fire.

[0057] In some embodiments of this application, the battery device 100 can be used to supply power to the vehicle; for example, the battery device 100 can serve as the vehicle's operating power source. In other embodiments, the battery device 100 can not only serve as the vehicle's operating power source, but also as the vehicle's driving power source, replacing or partially replacing fuel or natural gas to provide driving power to the vehicle.

[0058] In this application, the battery device 100 mentioned in the embodiments refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery device 100 is composed of multiple battery cells connected in series or in parallel.

[0059] Combination Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments of this application, a battery device 100 is proposed. The battery device 100 includes a module housing 110, a pressure relief assembly 120, and a filter element 140. The pressure relief assembly 120 is connected to the module housing 110 and includes a filter assembly 121 and an explosion-proof valve 122. The filter assembly 121 has at least two filter chambers 123, and two adjacent filter chambers 123 are interconnected. The filter chambers 123 are connected to the inner cavity 111 of the module housing 110 and the explosion-proof valve 122. The exhaust gas from the module housing 110 passes through at least two filter chambers 123 in sequence. The filter element 140 fills the filter chambers 123 and is used to filter the exhaust gas from the module housing 110.

[0060] The module housing 110 is a structural component that accommodates multiple battery cells. The inner cavity 111 of the module housing 110 constitutes the main space of the battery device 100. The module housing 110 not only provides installation, support and physical protection for the battery cells, but also becomes a sealed container that can withstand the rapidly rising internal temperature and pressure in the event of thermal runaway.

[0061] The pressure relief assembly 120 is connected to the module housing 110, for example, by welding or bolting, thereby forming a directional pressure relief channel between the pressure relief assembly 120 and the module housing 110. The filter assembly 121 has at least two interconnected filter chambers 123, which are connected in series in the airflow path between the inner cavity 111 of the module housing 110 and the explosion-proof valve 122, so that the exhaust gas must pass through all the filter chambers 123 sequentially before being discharged. This multi-stage series design of the filter chambers 123 prolongs the residence time of the exhaust gas within the filter structure, creating conditions for sufficient adsorption of particulate matter. In the event of thermal runaway, the filter assembly 121 provides a storage location for the filter material to filter particulate matter in the gas, and the filter assembly 121 is integrally assembled with the explosion-proof valve 122.

[0062] Each filter chamber 123 is filled with a filter element 140 made of porous material (such as ceramic fiber, sintered metal mesh, or glass wool). The filter element 140 intercepts particulate matter through the microporous structure of the material itself. Larger particles are initially intercepted by the filter element 140, and the exhaust gas then enters the next stage filter chamber 123 through the inter-chamber interconnection structure. During this process, smaller particles and liquids settle due to the stepwise decrease in flow velocity. This step-by-step filtration mechanism significantly improves the overall filtration efficiency, especially for visible smoke particles restricted by the GB38031-2025 standard, thereby reducing the risk of exhaust gas being ignited and even exploding. The multi-stage filtration method reduces the load on a single layer of filter element 140, reducing the probability of clogging due to excessive particle accumulation. The explosion-proof valve 122 is located at the end of the filtration system, making its pressure relief function less susceptible to impact from the filtration process.

[0063] In some embodiments, the filtration accuracy of the filter element 140 in two adjacent filter chambers 123 is different.

[0064] The filtration precision of the filter elements 140 in adjacent filter chambers 123 is configured with a gradient difference. For example, the first-stage filter chamber 123 near the module housing 110 uses a low-precision filter element 140 (such as a metal mesh with a pore size of 50μm-100μm). The low-precision filter element 140 is mainly used to intercept droplets and larger debris generated by electrolyte splashing. The final-stage filter chamber 123 uses a high-precision filter element 140 (such as ceramic paper with a pore size of 1μm-5μm). The high-precision filter element 140 is used to capture carbon powder and metal oxide particles. The first-stage low-precision filtration can efficiently remove most of the mass load. Although the subsequent small-diameter particles account for a small proportion of the mass, they are the main cause of visible smoke formation. The final-stage high-precision filtration specifically addresses this problem. The arrangement of the gradient filter elements 140 reduces the probability of the high-precision filter material being clogged by large particles prematurely, extending the service life of the overall structure.

[0065] In some embodiments, at least one filter element 140 is disposed in a filter chamber 123.

[0066] Multiple filter elements 140 can be integrated within a single filter chamber 123 to form a composite filter unit. For example, within the same filter chamber 123, stainless steel woven mesh, glass fiber cotton, and activated carbon felt can be arranged sequentially along the airflow direction to achieve mechanical interception, deep filtration, and chemical adsorption functions, respectively. This design is suitable for space-constrained battery devices 100, improving overall filtration performance without increasing the number of filter chambers 123. Exemplarily, the metal mesh provides initial impact protection, preventing the fiber material from being torn by high-speed airflow; the glass fiber cotton constructs a three-dimensional filter network through its disordered fiber structure to capture fine particles; and the activated carbon felt adsorbs harmful gases such as hydrogen fluoride in the emitted gas.

[0067] Combination Figure 3 , Figure 4 , Figure 6 , Figure 7 , Figure 9 and Figure 10 As shown, in some embodiments, the filter assembly 121 includes a housing 124 and at least one partition 125 located inside the housing 124. The partition 125 divides the interior of the housing 124 into at least two filter chambers 123. The partition 125 is provided with a plurality of through holes 126 that connect two adjacent filter chambers 123.

[0068] The outer shell 124 serves as the main support structure of the filtration system. The outer shell 124 can be made of extruded aluminum alloy or stamped stainless steel. The interior of the outer shell 124 is divided into multiple filter chambers 123 by at least one partition 125. The partition 125 can be formed into an array of through holes 126 by stamping or laser cutting, and the through holes 126 connect two adjacent filter chambers 123.

[0069] For example, the multiple through holes 126 can be arranged with denser holes at the center and sparser holes at the edges to guide the gas to pass evenly through the filter element 140 instead of flowing in a short circuit.

[0070] Combination Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, in some embodiments, the filter assembly 121 further includes a plurality of sleeves 127, the first side of the explosion-proof valve 122 faces away from the housing 124, and the second side of the explosion-proof valve 122 faces the housing 124, the direction from the first side of the explosion-proof valve 122 to the second side of the explosion-proof valve 122 ( Figure 4 (As indicated by the arrow at H in the middle) Multiple sleeves 127 are stacked inside the outer casing 124, and each sleeve 127 has a partition 125 fixed inside it.

[0071] Each sleeve 127 is an independent structural unit. Multiple sleeves 127 are stacked through stepped socket or threaded connection. Sealing rings are set at the interface of adjacent sleeves 127 to prevent gas leakage.

[0072] Standardized production of sleeve 127 can reduce manufacturing costs, and the stacking quantity can be flexibly adjusted according to the capacity of battery device 100, which is conducive to improving the processing and manufacturing convenience of filter component 121.

[0073] For example, when multiple sleeves 127 are stacked, the total area of ​​the through holes 126 of the inner baffle 125 of the upstream sleeve 127 is larger than the total area of ​​the through holes 126 of the inner baffle 125 of the downstream sleeve 127, forming a gradual throttling effect and reducing the probability of the filter element 140 being displaced due to sudden airflow changes (the upstream sleeve 127 and the downstream sleeve 127 refer to the upstream and downstream along the exhaust direction).

[0074] Combination Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, the filter assembly 121 further includes a protective member 128, which is connected to the housing 124 and is located inside the housing 124. A portion of the explosion-proof valve 122 extends into the protective member 128, and the protective member 128 is used to protect the portion of the explosion-proof valve 122 that extends into its own interior. A plurality of sleeves 127 are fitted onto the protective member 128.

[0075] A portion of the explosion-proof valve 122 extends into the housing 124, reducing the overall structural length of the pressure relief assembly 120. A protective member 128 surrounds the portion of the explosion-proof valve 122 that extends into the housing 124. During the assembly of the pressure relief assembly 120, the protective member 128 protects the explosion-proof valve 122, preventing structural damage from collisions with other components. The protective member 128 also prevents the sleeve 127 from contacting the explosion-proof valve 122, reducing the likelihood of the explosion-proof valve 122 failing due to structural damage.

[0076] Multiple sleeves 127 are fitted onto the outside of the protective component 128. A central axial hole is formed in each sleeve 127, creating a through-type installation channel. The extension section of the explosion-proof valve 122 can be embedded within this axial hole. This arrangement allows the explosion-proof valve 122 to no longer occupy an independent axial length, but instead shares the same spatial dimension with the filter assembly 121. This nested arrangement effectively reduces the size of the pressure relief assembly 120, which is significant for the highly sensitive, thin battery device 100.

[0077] Combination Figure 5 , Figure 6 and Figure 7As shown, in some embodiments, the filter assembly 121 further includes a protective member 128, which is connected to the housing 124 and is located inside the housing 124. A portion of the explosion-proof valve 122 extends into the protective member 128. A first side of the housing 124 is connected to the explosion-proof valve 122. A plurality of partitions 125 are adjacent to a second side of the housing 124 and are located along the length of the protective member 128. Figure 7 The arrow at L in the middle points to one side.

[0078] Multiple sleeves 127 are located on one side of the protective element 128. Each sleeve 127 does not require a central hole, allowing the filter element 140 to be arranged using its complete circular cross-section. This layout enables the filter element 140 to meet the airflow with maximum contact area. Since the sleeve 127 does not require a central opening, its manufacturing process is simplified, and production costs are correspondingly reduced. This solution significantly increases the effective filtration area of ​​the filter element 140, thereby improving overall filtration efficiency and better meeting the stringent requirements for smoke filtration during thermal runaway of the battery device 100.

[0079] Combination Figure 3 and Figure 4 As shown, in some embodiments, the filter assembly 121 further includes a cover 129, which covers the side of the housing 124 away from the explosion-proof valve 122. The cover 129 is provided with a filter hole 130, which connects the inner cavity 111 of the module housing 110 and the filter cavity 123.

[0080] The cover 129 can be fixed to the side of the outer shell 124 away from the explosion-proof valve 122 by snap-fit ​​connection or ultrasonic welding. The filter hole 130 provided on the cover 129 can realize the primary filtration function, and the pretreatment is completed before the gas enters the filter chamber 123, reducing the chance of the upstream filter element 140 being blocked.

[0081] For example, the filter pore 130 is designed as a tapered channel with a larger inlet diameter and a smaller outlet diameter, forming a Venturi effect to accelerate gas flow while intercepting larger particles through the friction of the inner wall of the channel.

[0082] Combination Figure 8 , Figure 9 and Figure 10 As shown, in some embodiments, both the outer shell 124 and the filter chamber 123 are annular, and the side of the outer shell 124 is provided with a filter hole 130. The filter hole 130 communicates with the filter chamber 123. Two adjacent filter chambers 123 are nested together. The filter hole 130 communicates with the inner cavity 111 of the module housing 110 and the filter chamber 123. The innermost filter chamber 123 is connected to the explosion-proof valve 122.

[0083] Both the outer casing 124 and the filter chamber 123 adopt an annular design, forming multiple concentric annular filtration areas. Filter holes 130 are located on the side of the outer casing 124, allowing gas to enter radially into the outermost annular filter chamber 123, then sequentially pass through each adjacent annular filter chamber 123, finally reaching the innermost annular filter chamber 123 and connecting with the explosion-proof valve 122. Adjacent filter chambers 123 are arranged in a nested configuration, with the smaller annular filter chamber 123 nested inside the larger one. This nesting design requires the gas to pass through multiple filter layers within a limited radial space, effectively extending the filtration path. Each annular filter chamber 123 is filled with filter material of different properties; since the gas must pass through all filter chambers 123 sequentially, multi-stage series filtration is achieved.

[0084] Another advantage of the annular structure is the uniformity of airflow distribution. After the gas enters through the filter hole 130 on the side of the outer shell 124, it will naturally form a circumferential flow within the annular filter chamber 123, solving the problem of dead zones that may occur in traditional straight flow. The innermost filter chamber 123 is directly connected to the explosion-proof valve 122.

[0085] This application adds different types of cylindrical structures to the tail end of the explosion-proof valve 122 to provide a storage location for filter materials. The cylinder has openings to provide a flow path for gas. After the gas passes through the holes, it reaches the filter materials, where solid substances are adsorbed or filtered. The structure is designed to store multiple layers of various filter materials before finally reaching the explosion-proof valve 122 for discharge.

[0086] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0087] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery device, characterized in that, include: Module housing; A pressure relief assembly is connected to the module housing. The pressure relief assembly includes a filter assembly and an explosion-proof valve. The filter assembly has at least two filter chambers. Two adjacent filter chambers are interconnected, and the filter chambers are connected to the inner cavity of the module housing and the explosion-proof valve. The exhaust gas from the module housing passes through at least two filter chambers in sequence. A filter element is filled in the filter cavity. The filter element is used to filter the exhaust gas of the module housing. The filter elements in two adjacent filter cavities have different filtration accuracies.

2. The battery device according to claim 1, characterized in that, At least one of the filter elements is disposed in one of the filter chambers.

3. The battery device according to claim 1 or 2, characterized in that, The filtering component includes: shell; At least one partition is located inside the housing, and the partition divides the inner cavity of the housing into at least two filter chambers. The partition is provided with a plurality of through holes that connect two adjacent filter chambers.

4. The battery device according to claim 3, characterized in that, The filtering component also includes: Multiple sleeves are arranged in the housing, with the first side of the explosion-proof valve facing away from the housing and the second side of the explosion-proof valve facing the housing. The multiple sleeves are stacked inside the housing in the direction from the first side of the explosion-proof valve to the second side of the explosion-proof valve, and the partition is fixed inside each sleeve.

5. The battery device according to claim 4, characterized in that, The filtering component also includes: A protective component is connected to the housing and is located inside the housing. A portion of the explosion-proof valve extends into the protective component, and a plurality of sleeves are fitted onto the protective component.

6. The battery device according to claim 4, characterized in that, The filtering component also includes: A protective component is connected to the housing and is located inside the housing. A portion of the explosion-proof valve extends into the protective component. A first side of the housing is connected to the explosion-proof valve. A plurality of partitions are adjacent to a second side of the housing and are located on one side of the protective component along its length.

7. The battery device according to claim 3, characterized in that, The filtering component also includes: A cover is provided on the side of the outer shell opposite to the explosion-proof valve. The cover is provided with a filter hole, which connects the inner cavity of the module shell and the filter cavity.

8. The battery device according to claim 3, characterized in that, Both the outer shell and the filter chamber are annular, and the outer shell has a filter hole on its side. The filter hole communicates with the filter chamber. Two adjacent filter chambers are nested together. The filter hole communicates with the inner cavity of the module shell and the filter chamber. The innermost filter chamber is connected to the explosion-proof valve.

9. An electrical device, characterized in that, include: The battery device as described in any one of claims 1 to 8.

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