Purification device, power supply system and vehicle

Abstract

The invention relates to a purification device, a power supply system and a vehicle, and relates to the technical field of new energy automobile power battery systems. The purification device comprises a shell assembly and a filtering assembly. The shell assembly comprises a first side wall, a first cavity is defined by the first side wall, and the filtering assembly is arranged in the first cavity. In the first direction, one end of the shell assembly comprises a first air inlet, and the other end of the shell assembly comprises a first air outlet. The first air inlet and the first air outlet are located in the two sides of the filtering assembly in the second direction respectively. The filtering assembly comprises a first filtering piece, the first filtering piece comprises a first filtering plate extending in the first direction, the first filtering plate comprises two opposite main surfaces in the second direction, two opposite side surfaces in the third direction and a plurality of first through holes, and the first through holes penetrate through the two opposite main surfaces of the first filtering plate. Two opposite side surfaces of the first filter plate are in contact with the inner surface of the first side wall. The first direction, the second direction and the third direction intersect pairwise.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicle power battery systems, and in particular to a purification device, a power supply system, and a vehicle. Background Art

[0002] With the rapid development of the domestic new energy vehicle industry, the market share of new energy vehicles is constantly increasing. As the main power component of new energy vehicles, power batteries directly determine the safety, life and performance of vehicles. In recent years, new energy vehicle accidents caused by thermal runaway of power batteries have occurred from time to time. The reason is that when the heat of the power battery monomer is too high and cannot be dissipated in time, the heat accumulation range will spread from local to the whole, and eventually the battery thermal runaway will occur. Thermal runaway of power batteries will not only bring high temperature and instantaneous high voltage, but also produce a lot of smoke, which contains a lot of particulate matter. The escape of these high-temperature particulates is prone to fire or even explosion. The combustion of a large amount of combustibles produces smoke that is inhaled into the human body, causing poisoning, threatening the lives of drivers and passengers.

[0003] At present, many research institutions and automobile manufacturers at home and abroad have proposed many feasible solutions to the high temperature and high pressure problems caused by battery thermal runaway, and they have been widely used in vehicles on the market. However, no effective solution has been proposed for the particulate matter and harmful gases generated by thermal runaway.

[0004] For example, patent (CN213936352U) proposes a battery thermal runaway cooling delay system. When the battery thermally runs away, the thermal runaway delay system is activated to achieve step control, but it cannot handle the smoke generated after the battery thermal runaway. For example, patent (CN219106442U) proposes a battery exhaust device, but its newly added device has no space for assembly, and a large amount of combustibles are generated inside the ternary lithium battery after thermal runaway. The device has a small adsorption area and cannot completely handle the ejection after the battery thermal runaway. After the ejection is blocked at the outlet of the vent valve, the vent valve loses its original pressure relief function, and the battery pack cannot be depressurized quickly, posing an explosion risk. Summary of the invention

[0005] The purpose of the present invention is to provide a purification device, a power supply system, and a vehicle, which can filter particulate matter and harmful substances in flue gas.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] The first aspect of the present application provides a purification device. The purification device includes: a shell assembly and a filter assembly. The shell assembly includes a first side wall, and the first side wall encloses a first cavity; along the first direction, one end of the shell assembly includes a first air inlet, and the other end includes a first exhaust port, and the first air inlet and the first exhaust port are both connected to the first cavity. The filter assembly is arranged in the first cavity, and the first air inlet and the first exhaust port are respectively located on both sides of the filter assembly along the second direction.

[0008] The filter assembly includes a first filter element, the first filter element includes a first filter plate extending along a first direction, the first filter plate includes two main surfaces opposite to each other along a second direction, two side surfaces opposite to each other along a third direction and a plurality of first through holes, the first direction, the second direction and the third direction intersect each other, the first through holes penetrate the two opposite main surfaces of the first filter plate, the two opposite side surfaces of the first filter plate are in contact with the inner surface of the first side wall; the two ends of the first filter plate along the first direction respectively extend toward the two ends of the first side wall along the first direction, and are flush or substantially flush with the end of the first side wall.

[0009] Beneficial effects of the present invention: After the external gas enters the first cavity through the first air inlet, part of the particles carried by the airflow will be intercepted by the first through hole on the first filter plate, thereby achieving physical filtration of the particles carried by the gas. The gas entering the first cavity from the first air inlet can be discharged through the first exhaust port only after passing through the first filter plate, thereby ensuring that the gas discharged from the purification device is clean gas filtered by the first filter element.

[0010] In some embodiments, the first filter element further comprises: at least one baffle disposed on the first filter plate, the baffle and the first air inlet being located on the same side of the first filter plate along the second direction. The first end of the baffle is connected to the first filter plate, and a first gap is formed between the second end of the baffle and the first side wall.

[0011] In some embodiments, the baffle includes two side surfaces opposite to each other along a third direction, and the two opposite side surfaces of the baffle are respectively in contact with the inner surface of the first side wall, or there is a second interval between the side surface of the baffle and the first side wall, and the second interval is less than or equal to the first interval.

[0012] In some embodiments, the first filter element includes n baffles arranged along the first direction, where n is a positive integer greater than or equal to 1. Among the n baffles, the height of the baffles gradually increases along the first direction and along the direction from the first air inlet to the first air outlet; the height of the baffle refers to the size of the baffle along the second direction.

[0013] In some embodiments, the n baffles divide the first filter plate into n+1 first subsections, each of which includes a plurality of first through holes. In the n+1 first subsections, the equivalent diameters of the first through holes included in each first subsection are the same or substantially the same, and the equivalent diameters of the first through holes included in the first subsections gradually decrease along the first direction and along the direction from the first air inlet to the first air outlet.

[0014] In some embodiments, the spacing between any one of the n baffles and the first side wall is less than or equal to the equivalent diameter of the first through hole on the first sub-portion of the baffle near the first air inlet; and / or, the spacing between any one of the n baffles and the first side wall is greater than or equal to the equivalent diameter of the first through hole on the first sub-portion of the baffle near the first exhaust port.

[0015] In some embodiments, the filter assembly also includes: a second filter element arranged on a side of the first filter plate close to the first exhaust port, the second filter element including a second sub-portion extending in the first direction, the second sub-portion having two ends along the first direction respectively extending to two ends of the first side wall along the first direction, and being flush or approximately flush with the end of the first side wall.

[0016] In some embodiments, the filter assembly further comprises: a second filter element disposed on a side of the first filter plate close to the first exhaust port, the second filter element comprising a plurality of second sub-sections sequentially connected along the first direction. Among the plurality of second sub-sections included in the second filter element, at least one second sub-section is in line contact with the first filter plate; and / or, among the plurality of second sub-sections included in the second filter element, at least one second sub-section is in surface contact with the first filter plate.

[0017] In some embodiments, the second filter element is cross-sectioned along a plane parallel to the first direction and parallel to the second direction, and the resulting cross-sectional shape is a zigzag shape, a wave shape, or a "bow" shape.

[0018] In some embodiments, among the plurality of second sub-portions included in the second filter element, ends of two outermost second sub-portions along the first direction are flush or substantially flush with an end of the first side wall.

[0019] In some embodiments, the second sub-portion includes two side surfaces that are opposite to each other along the third direction, and the two opposite side surfaces of the second sub-portion are in contact with the inner surface of the first side wall, respectively.

[0020] In some embodiments, the second sub-section includes: a first filter layer including two opposite main surfaces and a plurality of second through holes; and the second through holes penetrate through the two opposite main surfaces of the first filter layer.

[0021] In some embodiments, at least the surface of the first filter layer facing the first filter element is coated with an antistatic agent and / or a static dissipating agent.

[0022] In some embodiments, the second sub-section further comprises: a second filter layer disposed on a side of the first filter layer away from the first filter element, the second filter layer comprising a high temperature resistant fiber material. The second filter layer is configured to block and adsorb particulate matter; the size of the particulate matter is greater than or equal to 0.1 microns.

[0023] In some embodiments, the second filter layer is configured to adsorb harmful chemicals in the air and / or convert harmful chemicals in the air into harmless substances.

[0024] In some embodiments, the second subsection further includes: a third filter layer disposed on a side of the second filter layer away from the first filter layer, the third filter layer including two opposite main surfaces and a plurality of third through holes, the third through holes penetrating the two opposite main surfaces of the third filter layer.

[0025] In some embodiments, two sides of the second filter layer are in contact with the first filter layer and the third filter layer respectively.

[0026] In some embodiments, the third through hole has an equivalent diameter that is the same as or substantially the same as the second through hole.

[0027] In some embodiments, the hardness of the first filter layer is greater than the hardness of the second filter layer.

[0028] In some embodiments, the filter assembly further comprises: a third filter element disposed on a side of the second filter element away from the first filter element, the third filter element comprising a plurality of fourth through holes penetrating the second filter layer along the second direction. One end of the second sub-portion of the second filter element contacts the third filter element, and the other end contacts the first filter element.

[0029] In some embodiments, the purification device further includes: a support member disposed in the first cavity, wherein two ends of the support member along the first direction respectively extend toward two ends of the first side wall along the first direction, and are flush or substantially flush with the end of the first side wall. Along the second direction, the support member is further away from the first air inlet of the housing assembly than the purification device, and the support member contacts the purification device. The support member includes a plurality of hollow portions; or, the support member includes a breathable material.

[0030] In some embodiments, the support member includes two side surfaces that are opposite to each other along the third direction, and the two opposite side surfaces of the support member are in contact with the inner surface of the first side wall, respectively.

[0031] In some embodiments, the purification device further includes: a first connector disposed on one side of the housing component along the first direction, and a second connector disposed on the other side of the housing component along the first direction. The first connector is disposed in the first cavity and connected to the inner side wall of the first cavity; the second connector is disposed in the first cavity and connected to the inner side wall of the first cavity.

[0032] The first connecting member and the second connecting member seal the end of the first cavity, and the first air inlet and the first air outlet are arranged on the first side wall.

[0033] In some embodiments, the purification device further includes: a first connector disposed on one side of the housing component along the first direction, and a second connector disposed on the other side of the housing component along the first direction. The first connector is disposed outside the first cavity and connected to the end surface of the first cavity, and the second connector is disposed outside the first cavity and connected to the end surface of the first cavity; the first air inlet is disposed on the first connector, and the first exhaust port is disposed on the second connector.

[0034] The second aspect of the present application provides a power supply system. The power supply system includes: a box assembly, a power supply system, and at least one purification device provided in any of the above embodiments. The box assembly includes a first box, the first box includes a receiving cavity, the battery and the purification device are arranged in the receiving cavity, the first air inlet of the purification device is connected to the receiving cavity, and the first exhaust port of the purification device is connected to the exhaust port of the box assembly.

[0035] The above-mentioned power supply system has the same structure and beneficial technical effects as the purification devices provided in some of the above-mentioned embodiments, which will not be repeated here.

[0036] In some embodiments, the box assembly also includes: a first air duct arranged in the accommodating cavity, the first air duct includes a second air inlet and a second exhaust port, the second air inlet is connected to the accommodating cavity, and the second exhaust port is connected to the first air inlet of the purification device.

[0037] In some embodiments, the box assembly also includes: a second box arranged on one side of the first box, the second box includes a second air duct, the second air duct includes a third air inlet and a third exhaust port, the third air inlet is connected to the first exhaust port of the purification device, and the third exhaust port is connected to the exhaust port of the box assembly.

[0038] In some embodiments, the box assembly further comprises: a pressure relief assembly, which is in communication with the exhaust port of the box assembly. The pressure relief assembly is configured to close when the pressure in the box assembly is less than a set threshold, and to open when the pressure in the box assembly is greater than or equal to the set threshold, so as to exhaust the gas in the box assembly.

[0039] The third aspect of the present application provides a vehicle, which includes a vehicle body and a power supply system as provided in any of the above embodiments, wherein the power supply system is arranged in the vehicle body.

[0040] The above-mentioned vehicle has the same structure and beneficial technical effects as the purification device provided in some of the above-mentioned embodiments, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 Shown is a cross-sectional structural diagram of a power supply system according to some embodiments;

[0042] Figure 2 Shown is a structural diagram of a purification device of some embodiments;

[0043] Figure 3 Shown are cross-sectional structural diagrams of power supply systems of other embodiments;

[0044] Figure 4 Shown are structural diagrams of purification devices of other embodiments;

[0045] Figure 5 Shown are structural diagrams of purification devices of other embodiments;

[0046] Figure 6 Shown are cross-sectional structural diagrams of power supply systems of other embodiments;

[0047] Figure 7 Shown are cross-sectional structural diagrams of power supply systems of other embodiments;

[0048] Figure 8 Shown are cross-sectional structural diagrams of purification devices of some embodiments;

[0049] Fig. 9 Shown are cross-sectional structural diagrams of purification devices of other embodiments;

[0050] Fig.10 Shown is a block diagram of a filter assembly of some embodiments;

[0051] Fig.11 Shown are structural diagrams of filter assemblies of other embodiments;

[0052] Fig.12 A structural diagram showing a first filter element according to some embodiments;

[0053] Fig.13 A structural diagram showing a second filter element according to some embodiments;

[0054] Fig.14 Shown is a partially enlarged structural diagram of a second filter element in some embodiments;

[0055] Fig.15A block diagram showing a second subsection of some embodiments;

[0056] Fig.16 A structural diagram showing a second subsection of some other embodiments;

[0057] Fig.17 Shown are diagrams of the filter assembly and support structure of some embodiments.

[0058] In the figure, 100—power supply system;

[0059] 10—Purification device;

[0060] 1—housing assembly; 1a—first air inlet; 1b—first air outlet;

[0061] 11—first side wall; 11a—inner surface of the first side wall; Q1—first cavity;

[0062] 12—first connecting member;

[0063] 13—second connecting piece;

[0064] 2—Filter component;

[0065] 21—first filter element; 211—first filter plate; 211a—main surface of the first filter plate; 211b—side surface of the first filter plate; 211c—first through hole; 2111—first sub-section; 212—baffle plate; 212b—side surface of the baffle plate;

[0066] 22—second filter element; 221—second sub-section; 221b—side surface of the second sub-section;

[0067] 2211—first filter layer; 2211a—main surface of the first filter layer; 2211b—side surface of the first filter layer; 2211c—second through hole; 2211d—first filter material; 2211e—first substrate;

[0068] 2212 — second filter layer; 2212b — side surface of the second filter layer;

[0069] 2213—third filter layer; 2213a—main surface of the third filter layer; 2213b—side surface of the third filter layer; 2213c—third through hole; 2213d—second filter material; 2213e—second substrate;

[0070] 23—third filter element; 23a—main surface of the third filter element; 23b—side surface of the third filter element; 23c—fourth through hole;

[0071] 3—support member; 3b—side surface of the support member;

[0072] 20—box assembly; 20b—exhaust port;

[0073] 201—first box body; 2011—accommodation chamber; 2012—first air passage; 2012a—second air inlet; 2012b—second air outlet; 201a—open end;

[0074] 202—second box; 2021—second air passage; 2021a—third air inlet; 2021b—third air outlet;

[0075] 30—battery;

[0076] 40—Pressure relief assembly. DETAILED DESCRIPTION

[0077] In order to enable ordinary persons in the art to better understand the technical solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0078] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0079] For ease of understanding, the purification device, power supply system and vehicle provided in the present application are specifically introduced below with reference to the accompanying drawings.

[0080] The purification device and power supply system in the present application can be applied to vehicles, and can also be applied to other transportation vehicles such as airplanes or ships. The following takes the application in vehicles as an example to illustrate some embodiments of the present application.

[0081] In some embodiments, a vehicle includes: a vehicle body and a power supply system 100, wherein the power supply system 100 is disposed in the vehicle body. The power supply system 100 includes a battery 30, and the battery 30 is used to supply power to electrical devices in the vehicle.

[0082] When the battery 30 experiences thermal runaway, it will bring the danger of high temperature and instantaneous high voltage, and will also cause a lot of delays. The smoke contains a large amount of particulate matter. The escape of high-temperature particulate matter is prone to fire or even explosion. The combustion of a large amount of combustibles produces smoke that can easily cause poisoning when inhaled by the human body, threatening the life safety of the driver and passengers.

[0083] Based on this, the present application proposes a power supply system 100 .

[0084] In some embodiments, Figure 1 and Figure 3 As shown, the power supply system 100 further includes: a box assembly 20 and a purification device 10. The box assembly 20 includes a first box 201; the first box 201 includes a receiving chamber 2011, and the battery 30 and the purification device 10 are arranged in the receiving chamber 2011. The first air inlet 1a of the purification device 10 is communicated with the receiving chamber 2011, and the first exhaust port 1b of the purification device 10 is communicated with the exhaust port 20b of the box assembly 20.

[0085] In some examples, purification device 10 is configured to filter particulate matter in the air.

[0086] Particulate matter includes primary particulate matter and secondary particulate matter. Primary particulate matter includes smoke generated by thermal runaway of the battery 30, etc. Secondary particulate matter includes particulate matter generated by certain pollutant gas components (such as sulfur dioxide, nitrogen oxides, hydrocarbons, etc.), or by these components and normal components in the atmosphere (such as oxygen) through photochemical oxidation reactions, catalytic oxidation reactions or other chemical reactions, such as the conversion of sulfur dioxide into sulfate.

[0087] In addition, the particulate matter filtered and removed by the purification device 10 described in the present application also includes: structural fragments of the battery 30 generated by damage to the battery 30 when thermal runaway occurs in the battery 30, and structural fragments generated by damage to other structures in the accommodating cavity 2011, etc.

[0088] The size of the particulate matter described in some embodiments of the present application may refer to the particle size of dust particles, or the minimum aperture of a circular hole through which structural fragments can pass.

[0089] In other examples, the purification device 10 is further configured to adsorb harmful chemicals in the air, or to convert harmful chemicals in the air into harmless chemicals.

[0090] The gas in the accommodating chamber 2011 must be filtered by the purification device 10 before it can be discharged outside the box assembly 20. In this way, in the event of thermal runaway of the battery 30, the gas generated after the thermal runaway of the battery 30 must first be filtered by the purification device 10 before being discharged outside the box assembly 20. The purification device 10 can intercept and adsorb particulate matter in the airflow, and can adsorb or catalyze harmful gases in the airflow, so that the gas discharged outside the box assembly 20 is clean gas after filtering.

[0091] After the gas is filtered by the purification device 10, the concentration of particulate matter carried in the gas is reduced, and the harmful chemicals carried in the gas are adsorbed in the purification device 10, or converted into harmless substances and then discharged, thereby ensuring that when thermal runaway occurs in the battery 30, the particulate matter and harmful chemicals generated by the thermal runaway of the battery 30 are filtered and removed by the purification device 10, and will not be discharged outside the box assembly 20, thereby reducing the safety risks caused by thermal runaway of the battery 30.

[0092] For example, Figure 1 and Figure 3 As shown, at least one purification device 10 is disposed in the accommodating cavity 2011. That is, one, two or more purification devices 10 may be disposed in each box assembly 20 of the power supply system 100.

[0093] In this way, when two or more purification devices 10 are arranged in the accommodating chamber 2011, on the one hand, the gas in the accommodating chamber 2011 can be filtered simultaneously by multiple (two or more) purification devices 10, so that the filtering efficiency of the gas can be improved; on the other hand, with such a design, even if particulate matter accumulation or other problems occur in one of the purification devices 10, causing the purification device 10 to fail to filter or reduce the filtering efficiency, the gas can still be filtered by the remaining purification devices 10 to ensure the filtering effect of the gas.

[0094] Exemplarily, the first air inlets 1a of all (at least one) purification devices 10 in the accommodating chamber 2011 are connected to the accommodating chamber 2011, and the first exhaust ports 1b of all purification devices 10 in the accommodating chamber 2011 are connected to the exhaust port 20b of the box assembly 20.

[0095] Based on this, the box assembly 20 may be provided with an exhaust port 20b, and the first exhaust ports 1b of all (at least one) purification devices 10 are connected to the exhaust port 20b. Alternatively, the box assembly 20 may also be provided with multiple (two or more) exhaust ports 20b, and each exhaust port 20b is connected to the first exhaust port 1b of at least one purification device 10.

[0096] In some embodiments, Figure 2As shown, the purification device 10 includes: a housing component 1 and a filter component 2. The housing component 1 includes a first side wall 11, the first side wall 11 encloses a first cavity Q1, the filter component 2 is arranged in the first cavity Q1, one end of the housing component 1 along the first direction X includes a first air inlet 1a, and the other end of the housing component 1 along the first direction X includes a first exhaust port 1b, the first air inlet 1a and the first exhaust port 1b are both connected to the first cavity Q1, and the first air inlet 1a and the first exhaust port 1b are respectively located on opposite sides of the filter component 2 along the second direction Y. The first direction X intersects with the second direction Y.

[0097] like Figure 2 As shown, along the first direction X, one side of the first cavity Q1 is connected to the outside through the first air inlet 1a, and the other side is connected to the outside through the first exhaust port 1b. The gas enters the first cavity Q1 through the first air inlet 1a, thereby realizing physical filtration of particulate matter carried in the gas, as well as chemical adsorption or harmless conversion of harmful chemicals carried in the gas, thereby realizing filtration and removal of particulate matter and harmful chemicals carried in the gas, so that the gas of the purification device 10 discharged through the first exhaust port 1b is filtered gas.

[0098] At the same time, when the gas enters the first cavity Q1 through the first gas inlet 1a, larger particles will be intercepted outside the first gas inlet 1a and will not enter the first cavity Q1 with the gas flow.

[0099] In some embodiments, Figure 3 As shown, the box assembly 20 further includes a first air channel 2012, which is disposed in the accommodating chamber 2011 and includes a second air inlet 2012a and a second air outlet 2012b, the second air inlet 2012a is communicated with the accommodating chamber 2011, and the second air outlet 2012b is communicated with the first air inlet 1a of the purification device 10.

[0100] In this embodiment, by arranging the purification device 10 and the first air duct 2012 in the accommodating chamber 2011 of the box assembly 20, after the battery 30 pack has thermal runaway, the high-temperature gas first flows from the accommodating chamber 2011 into the first air duct 2012 through the second air inlet 2012a, collides in the first air duct 2012, and cools the gas; then, after passing through the first air duct 2012, the gas enters the purification device 10 through the first air inlet 1a, and the gas enters the purification device 10 for filtration, and then is discharged from the box assembly 20. The purification device 10 adsorbs and filters the particulate matter and harmful substances in the airflow, so that the gas discharged from the box assembly 20 is clean and harmless gas.

[0101] By setting the first air duct 2012, the temperature of the gas entering the purification device 10 is lower than the temperature of the high-temperature gas generated by the thermal runaway of the battery 30, thereby avoiding the high temperature from affecting the material of the filter component 2, and better protecting the filter component 2 in the purification device 10, so that the filter component 2 can achieve the expected filtering effect.

[0102] In some embodiments, Figure 2 , Figure 4 and Figure 5 As shown, the purification device 10 further includes: a first connecting member 12 disposed on one side of the housing assembly 1 along the first direction X, and a second connecting member 13 disposed on the other side of the housing assembly 1 along the first direction X.

[0103] like Figure 2 and Figure 4 As shown, the first connecting member 12 may be disposed in the first cavity Q1 and connected to the inner wall of the first cavity Q1; or Figure 5 As shown, the first connecting member 12 may also be disposed outside the first cavity Q1 and connected to the end surface of the first cavity Q1.

[0104] Accordingly, if Figure 2 and Figure 4 As shown, the second connecting member 13 may be disposed in the first cavity Q1 and connected to the inner wall of the first cavity Q1; or Figure 5 As shown, the second connecting member 13 may also be disposed outside the first cavity Q1 and connected to the end surface of the first cavity Q1.

[0105] The aforementioned “first air inlet 1a and first exhaust port 1b are respectively located on both sides of the filter component 2 along the second direction Y” means that the gas outside the purification device 10 enters the first cavity Q1 through the first air inlet 1a, is filtered by the filter component 2, and is then discharged through the first exhaust port 1b.

[0106] Specifically, the directions of the first air inlet 1a and the first exhaust port 1b are not limited. The opening directions of the first air inlet 1a and the first exhaust port 1b can be along the first direction X, along the second direction Y, or along other directions.

[0107] For example, Figure 2 As shown, the first connecting member 12 and the second connecting member 13 seal the end of the first cavity Q1 , and the first air inlet 1 a and the first air outlet 1 b of the purification device 10 are both disposed on the first side wall 11 .

[0108] For example, Figure 4 and Figure 5As shown, the first air inlet 1 a is disposed on the first connecting member 12 , and the first air outlet 1 b is disposed on the second connecting member 13 .

[0109] For another example, the first air inlet 1 a is disposed on the first connecting member 12 , and the first air outlet 1 b is disposed on the first side wall 11 .

[0110] For another example, the first air inlet 1 a is disposed on the first side wall 11 , and the first air outlet 1 b is disposed on the second connecting member 13 .

[0111] Based on the above, in the purification device 10, by setting the first connecting member 12, the second connecting member 13, the first air inlet 1a and the first exhaust port 1b, the flow direction of the gas entering the first cavity Q1 and flowing out of the first cavity Q1 is limited, ensuring that the gas discharged by the purification device 10 is clean gas after being filtered by the filter component 2.

[0112] And, if Figure 1 and Figure 2 As shown, the first air inlet 1a and the first air outlet 1b may be arranged on the first side wall 11; or Figure 3 , Figure 4 and Figure 5 As shown, the first air inlet 1a may be provided on the first connecting member 12, and the first exhaust port 1b may be provided on the second connecting member 13. Specifically, an adaptive design may be performed according to actual needs, and the design is more flexible and can adapt to different application scenarios. This is only an exemplary description of some possible embodiments of the present application and is not intended to limit the present disclosure.

[0113] By respectively arranging the first connecting member 12 and the second connecting member 13 on both sides of the first cavity Q1, when the purification device 10 is arranged in the accommodating cavity 2011, it can be fixedly connected with the remaining structures (such as the first air duct 2012, and / or the first box body 201) through the first connecting member 12 and the second connecting member 13. Compared with the connection and fixation achieved through the end of the first side wall 11, the connection area can be increased, thereby improving the connection firmness.

[0114] At the same time, by respectively arranging the first connecting member 12 and the second connecting member 13 on both sides of the first cavity Q1, it is also possible to ensure that the airflow direction flows as expected, thereby preventing the unpurified gas entering the first cavity Q1 from leaking from the end of the first cavity Q1, and ensuring that the gas enters the first cavity Q1 from the first air inlet 1a and is filtered by the filter component 2 before being discharged from the first exhaust port 1b, thereby ensuring the filtering effect of the purification device 10 on the gas.

[0115] In some embodiments, Figure 1 and Figure 3As shown, the power supply system 100 further includes: a pressure relief assembly 40 disposed on one side of the box assembly 20 along the first direction X, and the pressure relief assembly 40 is connected to the exhaust port 20b of the box assembly 20. The pressure relief assembly 40 is configured to be closed when the pressure in the box assembly 20 is less than a set threshold, and to be opened when the pressure in the box assembly 20 is greater than or equal to the set threshold, so as to discharge the gas in the box assembly 20 and keep the gas pressure in the box assembly 20 within a set range.

[0116] Exemplarily, the pressure relief component 40 includes a relief valve. Of course, the pressure relief component 4 may also be other types of valve bodies, or structures or devices with pressure relief functions, which are only used as exemplary descriptions of some possible implementations of the present application and are not intended to limit the present application.

[0117] By providing the pressure relief component 40 , when the air pressure in the box assembly 20 is too high, the pressure relief component 40 opens to relieve the pressure in the box assembly 20 , which can effectively prevent the risks that may be caused by the excessive air pressure in the box assembly 20 .

[0118] In some embodiments, Figure 6 and Figure 7 As shown, the box assembly 20 also includes: a second box 202 arranged on one side of the first box 201, the second box 202 includes a second air duct 2021, the second air duct 2021 includes a third air inlet 2021a and a third exhaust port 2021b, the third air inlet 2021a is connected to the first exhaust port 1b of the purification device 10, and the third exhaust port 2021b is connected to the outside of the second box 202.

[0119] Exemplarily, the first box body 201 and the second box body 202 may be an integral structure. For example, the box body assembly 20 may include a shell and a partition disposed in the shell, and the partition separates the shell into the first box body 201 and the second box body 202 .

[0120] Alternatively, the first box body 201 and the second box body 202 may also be a split structure, with one surface of the first box body 201 connected to a surface of the second box body 202, or the first box body 201 includes an open end 201a, which is connected to the accommodating cavity 2011, and the open end 201a faces the second box body 202 and is connected to the second box body 202.

[0121] Exemplarily, the second box body 202 may be disposed on one side of the first box body 201 along the first direction X.

[0122] When the battery 30 is in thermal runaway, the high-temperature gas generated by the thermal runaway of the battery 30 first enters the first air channel 2012, and is subjected to collision cooling in the first air channel 2012. The cooled gas enters the first cavity Q1 of the purification device 10 from the first air inlet 1a of the purification device 10, is filtered through the filter assembly 2, and is then discharged through the first exhaust port 1b of the purification device 10. The clean gas discharged from the purification device 10 enters the second air channel 2021 through the third air inlet 2021a, is subjected to collision cooling again in the second air channel 2021, and is then discharged from the box assembly 20 through the third exhaust port 2021b.

[0123] In this process, the particulate matter generated after the thermal runaway of the battery 30 has been intercepted into the purification device 10, and the harmful gas generated has been converted into harmless gas, which better protects the safety of the driver and passengers. In addition, the clean gas filtered by the purification device 10 collides in the second airway 2021, which can also achieve secondary cooling of the gas, so that the gas discharged from the box assembly 20 is clean gas, and the temperature of the gas is reduced to the expected range, reducing the risk of high-temperature gas discharge causing burns to the driver and passengers, and the risk of high-temperature gas causing thermal damage to the remaining structures around the box assembly 20 (such as the wiring in the vehicle, etc.), causing deformation, cracking or failure of the equipment, thereby improving the safety of the vehicle.

[0124] In some embodiments, Figure 8 , Fig. 9 and Fig.10 As shown, the filter assembly 2 of the purification device 10 includes a first filter element 21. The first filter element 21 includes a first filter plate 211 extending along a first direction X, and a first air inlet 1a and a first air outlet 1b are located at opposite sides of the first filter element 21 along a second direction Y, respectively.

[0125] like Fig.12 As shown, the first filter plate 211 includes two main surfaces 211a opposite to each other along the second direction Y, two side surfaces 211b opposite to each other along the third direction Z, and a plurality of first through holes 211c. The first direction X, the second direction Y and the third direction Z intersect in pairs, and the first through holes 211c penetrate the two opposite main surfaces 211a of the first filter plate 211.

[0126] Exemplarily, the shape of the first through hole 211c may be circular, quasi-circular, elliptical or quasi-elliptical, or may be a polygon such as a triangle, rectangle, oblong, rhombus, trapezoid, parallelogram, pentagon, hexagon or other polygon.

[0127] When the shape of the first through hole 211c is circular, the equivalent diameter of the first through hole 211c refers to the diameter of the circle; when the first through hole 211c is a shape other than a circle, the equivalent diameter of the first through hole 211c refers to the diameter of the largest sphere that can pass through the first through hole 211c.

[0128] like Figure 8 , Fig. 9 and Fig.10 As shown, after the external gas enters the first cavity Q1 through the first air inlet 1a, part of the particles carried by the airflow will be intercepted by the first through hole 211c on the first filter plate 211, thereby achieving physical filtration of the particles carried by the gas.

[0129] In some embodiments, see Figure 8 , Fig. 9 and Fig.12 The two ends of the first filter plate 211 along the first direction X extend toward the two ends of the first side wall 11 along the first direction X, and are flush or substantially flush with the end of the first side wall 11, and the two opposite side surfaces 211b of the first filter plate 211 are in contact with the inner surface 11a of the first side wall 11.

[0130] The two ends of the first filter plate 211 along the first direction X are flush or substantially flush with the ends of the first cavity Q1. Figure 8 As shown, both ends of the first filter plate 211 along the first direction X may be connected to the first connecting member 12 and the second connecting member 13, respectively, and as shown in FIG. Figure 8 , Fig. 9 and Fig.12 As shown, the side surface 211b of the first filter plate 211 is in contact with the inner wall of the first cavity Q1, so that the gas entering the first cavity Q1 from the first air inlet 1a can be discharged through the first exhaust port 1b only after passing through the first filter element 21, ensuring that the gas discharged from the purification device 10 is all gas filtered by the first filter element 21.

[0131] In some embodiments, Figure 8 , Fig. 9 , Fig.10 and Fig.12 As shown, the first filter element 21 further includes: at least one baffle 212, which is disposed on the first filter plate 211 and is located on the same side of the first filter plate 211 as the first air inlet 1a in the second direction Y. One end of the baffle 212 is connected to the first filter plate 211, and the other end of the baffle 212 is spaced from the first sidewall 11 by a first gap.

[0132] like Figure 8 and Fig. 9As shown, by arranging a baffle 212 on the first filter plate 211, a first gap is provided between the top of the baffle 212 (the side of the baffle 212 away from the first filter plate 211) and the first side wall 11, and the first gap can also play a role in blocking some particles. In this way, when the gas entering the first cavity Q1 flows along the first direction X, some particles carried in the airflow whose size is larger than the first gap are intercepted by the baffle 212 and no longer flow with the airflow to the first exhaust port 1b, thereby reducing the concentration of particles carried in the gas flowing to the first exhaust port 1b.

[0133] In some embodiments, Figure 8 , Fig. 9 , Fig.10 and Fig.12 As shown, the first filter element 21 includes n baffles 212 arranged along the first direction X, where n is a positive integer greater than or equal to 1. Among the n baffles 212, along the first direction X and from the first air inlet 1a to the first air outlet 1b, the height of the baffles 212 gradually increases.

[0134] The height of the baffle 212 may refer to the size of the baffle 212 along the second direction Y. When the heights of the baffles 212 are different, the size of the first interval formed between each baffle 212 and the first sidewall 11 is also different.

[0135] By arranging a plurality of baffles 212 of different heights on the first filter plate 211, the plurality of baffles 212 divide the space between the first filter plate 211 and the first side wall 11 into a plurality of areas, for example Figure 8 and Fig. 9 In the regions G1, G2 and G3 shown in the figure, when the gas entering the first cavity Q1 flows along the first direction X, the larger particles are blocked by the baffle 212 and will not flow toward the first exhaust port 1b with the airflow. Only the particles smaller than the first interval among the particles carried in the airflow can flow toward the first exhaust port 1b with the airflow.

[0136] By gradually increasing the height of the baffle 212 along the direction from the first air inlet 1a to the first exhaust port 1b, the concentration of particulate matter carried by the gas in areas G1, G2 and G3 is gradually reduced, and larger particles are filtered out and will not flow to the vicinity of the first exhaust port 1b, thereby avoiding the accumulation of particles around the first exhaust port 1b, which may block the airflow channel and affect gas discharge.

[0137] By arranging a plurality of baffles 212 of different heights on the first filter plate 211, particulate matter carried by the gas entering the first cavity Q1 through the first air inlet 1a can be evenly distributed in regions G1, G2 and G3 when flowing toward the first exhaust port 1b, and the particulate matter can be filtered through the first through hole 211c on the first filter plate 211, thereby making full use of the first filter plate 211.

[0138] In some embodiments of the present application, two baffles 212 are provided on the first filter plate 211 for illustration. It can be understood that the specific implementation of the present application is not limited to this. The first filter plate 211 can be provided with one, two or more baffles 212, and the specific adaptive design can be carried out according to actual needs.

[0139] In some embodiments, Fig.12 As shown, the baffle 212 includes two side surfaces 212 b opposite to each other along the third direction Z, and the two opposite side surfaces 212 b of the baffle 212 are in contact with the inner surface 11 a of the first side wall 11 , respectively.

[0140] The side surface 212b of the baffle 212 can be connected and fixed to the inner surface 11a of the first side wall 11. By making the side surface 212b of the baffle 212 fit with the first side wall 11, the strength of the baffle 212 can be increased, and the baffle 212 can be prevented from tipping over under the impact of airflow, thereby ensuring the baffle 212's blocking effect on particulate matter.

[0141] In other embodiments, there is a second interval between the side surface 212b of the baffle 212 and the first side wall 11, and the second interval is smaller than or equal to the first interval. The first interval and the second interval mentioned here are compared with the interval between the same baffle 212 and the first side wall 11.

[0142] By ensuring that there is a certain gap between the side surface 212b of the baffle 212 and the first side wall 11, the gas entering the first cavity Q1 can pass through a larger area during its flow, compared with when the side surface 212b of the baffle 212 is in contact with the first side wall 11. This reduces the resistance during the flow of the gas and keeps the gas flow rate within the expected range. The particles carried in the gas can be evenly distributed on the first filter plate 211, avoiding the problem of local accumulation of particles causing blockage and affecting the filtering effect, thereby improving the utilization rate of the first filter plate 211 and ensuring the filtering effect of the first filter element 21.

[0143] In summary, in the purification device 10, on the side close to the first air inlet 1a, the interval between the baffle 212 on the first filter element 21 and the first side wall 11 is relatively narrow, and on the side close to the first exhaust port 1b, the interval between the baffle 212 and the first side wall 11 is relatively large. This helps to control the incoming airflow so that it is restricted and guided to a certain extent when passing through the baffle 212. It also helps to reduce obstructions in the flow of the airflow so that the airflow can be discharged more smoothly, which is beneficial to improving the purification efficiency of the gas by the purification device 10.

[0144] In some embodiments, Fig.12 As shown, n baffles 212 separate the first filter plate 211 into n+1 first sub-portions 2111 , and each first sub-portion 2111 includes a plurality of first through holes 211 c .

[0145] In the n+1 first sub-sections 2111, the equivalent diameters of the first through holes 211c included in each first sub-section 2111 are the same or approximately the same, and the equivalent diameters of the first through holes 211c included in the first sub-section 2111 gradually decrease along the first direction X and along the direction from the first air inlet 1a to the first exhaust port 1b.

[0146] Exemplarily, the plurality of first through holes 211 c on each first sub-portion 2111 may be arranged in an array or in a staggered arrangement.

[0147] Along the first direction X and along the direction from the first air inlet 1a to the first exhaust port 1b, the n baffles 212 are numbered in sequence as baffle 212(1), baffle 212(2), ..., baffle 212(n); the n+1 first sub-sections 2111 are numbered in sequence as first sub-section 2111(1), first sub-section 2111(2), ..., first sub-section 2111(n+1); and the first through hole 211c on each first sub-section 2111 is numbered in sequence as first through hole 211c(1), first through hole 211c(2), ..., first through hole 211c(n).

[0148] See also Figure 8 , Fig. 9 and Fig.12The first filter element 21 includes two baffles 212. The baffles 212(1) and 212(2) separate the first filter plate 211 into a first sub-section 2111(1), a first sub-section 2111(2) and a first sub-section 2111(3). The first sub-section 2111(1) is located in region G1, the first sub-section 2111(2) is located in region G2, and the first sub-section 2111(3) is located in region G3. The first sub-section 2111(1) has a plurality of first through holes 211c(1), the first sub-section 2111(2) has a plurality of first through holes 211c(2), and the first sub-section 2111(3) has a plurality of first through holes 211c(3).

[0149] like Fig.12 As shown, the equivalent diameter of the first through hole 211c (1) is greater than the equivalent diameter of the first through hole 211c (2); the equivalent diameter of the first through hole 211c (2) is greater than the equivalent diameter of the first through hole 211c (3).

[0150] By using the first through holes 211c of different sizes on the multiple first sub-sections 2111, filtering of particles of different sizes is achieved. The first sub-section 2111 closer to the first exhaust port 1b can filter out particles of smaller sizes. Combined with the height variation design of the baffle 212, graded filtration of particles carried in the airflow is achieved in the process of the airflow passing through the areas G1, G2 and G3 in sequence. The first filter plate 211 is fully utilized to avoid the problem of blockage caused by accumulation of particles around the first exhaust port 1b, and the airflow distribution in the first cavity Q1 can be more uniform, thereby ensuring the filtering effect of the filter component 2.

[0151] On this basis, if Fig.12 As shown, the equivalent diameters of the plurality of first through holes 211 c on the same first sub-portion 2111 may be the same or different.

[0152] For example, Fig.12 As shown, the equivalent diameters of the multiple first through holes 211c(1) on the first sub-section 2111(1) are all the same, the equivalent diameters of the multiple first through holes 211c(2) on the first sub-section 2111(2) are all the same, and the equivalent diameters of the multiple first through holes 211c(3) on the first sub-section 2111(3) are all the same.

[0153] Furthermore, the equivalent diameter of the multiple first through holes 211c(1) on the first sub-section 2111(1) is greater than the equivalent diameter of the multiple first through holes 211c(2) on the first sub-section 2111(2); the equivalent diameter of the multiple first through holes 211c(2) on the first sub-section 2111(2) is greater than the equivalent diameter of the multiple first through holes 211c(3) on the first sub-section 2111(3).

[0154] For example, along the first direction X, and along the direction from the first sub-section 2111(1) to the first sub-section 111(n) (the direction from the first air inlet 1a of the purification device 10 to the first air outlet 1b), the equivalent diameters of the multiple first through holes 211c(1) on the first sub-section 2111(1) gradually decrease, the equivalent diameters of the multiple first through holes 211c(2) on the first sub-section 2111(2) gradually decrease, and the equivalent diameters of the multiple first through holes 211c(3) on the first sub-section 2111(3) gradually decrease.

[0155] Furthermore, the minimum value of the equivalent diameters of the multiple first through holes 211c(1) on the first sub-section 2111(1) is greater than the maximum value of the equivalent diameters of the multiple first through holes 211c(2) on the first sub-section 2111(2); and the minimum value of the equivalent diameters of the multiple first through holes 211c(2) on the first sub-section 2111(2) is greater than the maximum value of the equivalent diameters of the multiple first through holes 211c(3) on the first sub-section 2111(3).

[0156] In some embodiments, Figure 8 , Fig. 9 and Fig.12 As shown, the spacing between any one of the n baffles 212 and the first side wall 11 is less than or equal to the equivalent diameter of the first through hole 211c on the first sub-portion 2111 of the baffle 212 near the first air inlet 1a; and / or, the spacing between any one of the n baffles 212 and the first side wall 11 is greater than or equal to the equivalent diameter of the first through hole 211c on the first sub-portion 2111 of the baffle 212 near the first exhaust port 1b.

[0157] In combination with the foregoing, the interval between the baffle 212 and the first side wall 11 includes: a first interval between the top of the baffle 212 (the side of the baffle 212 away from the first filter plate 211) and the first side wall 11; or, a first interval between the top of the baffle 212 and the first side wall 11 and a second interval between the side surface 212b of the baffle 212 and the first side wall 11, and the sizes of the first interval and the second interval may be the same or different.

[0158] Exemplarily, the spacing between the baffle 212 and the first side wall 11 is less than or equal to the minimum value of the equivalent diameter of the first through hole 211c on the first sub-portion 2111 of the baffle 212 near the first air inlet 1a; and / or the spacing between the baffle 212 and the first side wall 11 is greater than or equal to the maximum value of the equivalent diameter of the first through hole 211c on the first sub-portion 2111 of the baffle 212 near the first exhaust port 1b.

[0159] By matching the spacing between the baffle 212 and the first side wall 11 and the size of the first through hole 211c on the first sub-portion 2111 adjacent to the baffle 212, the purification device 10 can more effectively control the flow of the airflow and ensure that the gas is fully filtered and processed when passing through the first filter element 21.

[0160] At the same time, the design of the first filter plate 211 and the baffle plate 212 thereon helps to enhance the filtering efficiency, especially when processing a large amount of gas, and can ensure that impurities in the gas are effectively removed.

[0161] In some embodiments, Figure 8 and Fig. 9 As shown, the filter assembly 2 further includes a second filter element 22 , and the second filter element 22 is disposed on a side of the first filter element 21 close to the first exhaust port 1 b .

[0162] For example, Figure 8 and Fig.10 As shown, the second filter element 22 is located at one side of the first filter element 21 along the second direction Y, and is closer to the first exhaust port 1 b than the first filter element 21 .

[0163] In this way, the gas entering the first cavity Q1 will be filtered by the second filter element 22 again after being filtered by the first filter element 21. By matching the first filter element 21 and the second filter element 22 to perform secondary filtering on the gas, the filtering effect of the gas can be improved.

[0164] In some embodiments, Figure 8 As shown, the second filter element 22 is cut into a cross section along a plane parallel to the first direction X and the second direction Y, and the cross section is rectangular. That is, the second filter element 22 may be in the shape of a flat plate as a whole.

[0165] Based on this, the second filter element 22 may include one second sub-portion 221; or, the second filter element 22 may include a plurality of second sub-portions 221 connected in sequence, and the plurality of second sub-portions 221 are all located in the same plane.

[0166] In some embodiments, Figure 8 As shown, the second filter element 22 includes a second sub-portion 221 extending along the first direction X. The two ends of the second sub-portion 221 along the first direction X extend toward the two ends of the first side wall 11 along the first direction X respectively, and are flush or substantially flush with the end of the first side wall 11.

[0167] The plane where the second sub-portion 221 is located may be parallel or approximately parallel to the plane where the first filter plate 211 is located, or the plane where the second sub-portion 221 is located may also intersect with the plane where the first filter plate 211 is located.

[0168] In other embodiments, Fig. 9 As shown, the second filter element 22 includes a plurality of second sub-portions 221 sequentially connected along the first direction X. Among the plurality of second sub-portions 221 included in the second filter element 22, ends of the two outermost second sub-portions 221 along the first direction X are flush or substantially flush with the end of the first side wall 11.

[0169] Based on this, in some embodiments, such as Fig. 9 , Fig.10 and Fig.11 As shown, the second filter element 22 is cross-sectioned along a plane parallel to the first direction X and parallel to the second direction Y, and the resulting cross-sectional shape is a broken line, a wave shape, or a "bow" shape. The multiple second sub-sections 221 included in the second filter element 22 form a tortuous and continuous shape in the cross-sectional structure, so that the contact area between the second filter element 22 and the airflow can be increased, and the filtering efficiency of the second filter element 22 on the gas can be improved.

[0170] In some embodiments, Fig. 9 , Fig.10 and Fig.11 As shown, at least one of the plurality of second sub-portions 221 included in the second filter element 22 is in contact with the first filter plate 211. That is, some (one or more) of the plurality of second sub-portions 221 included in the second filter element 22 may be in contact with the first filter plate 211, or all of the plurality of second sub-portions 221 included in the second filter element 22 may be in contact with the first filter plate 211.

[0171] Specifically, in some examples, such as Fig.10 As shown, among the plurality of second sub-sections 221 included in the second filter element 22, at least one second sub-section 221 is in line contact with the first filter plate 211; and / or, in other examples, such as Fig.11 As shown, among the plurality of second sub-portions 221 included in the second filter element 22 , at least one second sub-portion 221 is in surface contact with the first filter plate 211 .

[0172] In this way, when the second sub-portion 221 included in the second filter element 22 is in contact with the first filter plate 211 , the first filter element 21 and the second filter element 22 can structurally support each other to a certain extent, thereby improving the overall strength of the filter assembly 2 .

[0173] Based on this, a single second sub-portion 221 may be a generally flat plate-shaped structure, or a generally arc-shaped plate-shaped structure.

[0174] For example, Fig.10As shown, the portion where two adjacent second sub-sections 221 meet forms a sharp angle. Thus, the second sub-section 221 is a flat plate structure. Fig.14 As shown, the portion where two adjacent second sub-sections 221 meet forms an arc angle. Thus, although the portion where two adjacent second sub-sections 221 meet is arc-shaped, the second sub-section 221 as a whole is a flat plate structure.

[0175] Based on this, Fig.13 and Fig.14 As shown, the first direction X and the second direction Y intersect the plane where the second sub-section 221 is located, and the third direction Z is parallel to the plane where the second sub-section 221 is located. The angle formed between two adjacent second sub-sections 221 can be an acute angle, a right angle, or an obtuse angle. Fig.10 As shown, the planes where any two adjacent second sub-sections 221 are located intersect to form an acute angle. Fig.11 As shown, the planes where two adjacent second sub-portions 221 are located intersect to form an obtuse angle.

[0176] like Figure 8 and Fig. 9 As shown, when the second sub-portion 221 intersects with the second direction Y and the first direction X, the gas filtered by the first filter element 21 flows toward the first exhaust port 1b after passing through the second filter element 22. During the process of the airflow passing through the second filter element 22, part of the particles carried in the airflow are intercepted and filtered by the second filter element 22, and, under the impact of the airflow, the intercepted and filtered particles will slide down and deposit along the surface of the second sub-portion 221. In this way, most of the surface of the second sub-portion 221 can be exposed and not covered or blocked by the particles, thereby avoiding the accumulation of particles on the surface of the second sub-portion 221 that affects the gas flow.

[0177] At the same time, the corrugated filter material formed by the plurality of inclined second sub-sections 221 has a larger contact area with the gas, which effectively increases the filtering area of ​​the filter material and improves the filtering effect.

[0178] Exemplarily, the second filter element 22 is used to filter particles with a size greater than or equal to 0.1 microns.

[0179] When the gas entering the first cavity Q1 passes through the first filter element 22, the particulate matter carried in the gas is filtered once, and the larger particles are filtered out first; then, when the airflow passes through the second filter element 22, the particulate matter carried in the gas is filtered for a second time, and the particles greater than or equal to 0.1 microns in size are filtered out.

[0180] Since the larger particles carried in the gas have been filtered out by the first filter element 21, the size and concentration of the particles carried in the gas are significantly reduced at the second filter element 22, effectively preventing the particles from accumulating on the surface of the second sub-section 221 and affecting the filtering effect of the second sub-section 221. Through the cooperation of the first filter element 21 and the plurality of second sub-sections 221, graded filtering of the particles is achieved, ensuring the filtering effect of the filter assembly 2 on the particles.

[0181] For example, the plurality of second sub-portions 221 may be a plurality of separate second sub-portions 221 connected in sequence, or may be obtained by bending an integral filter material for multiple times, and the specific design may be adaptive according to needs.

[0182] In some embodiments, Fig.14 As shown, the second sub-portion 221 includes two side surfaces 221 b opposite to each other along the third direction Z, and the two opposite side surfaces 221 b of the second sub-portion 221 are in contact with the inner surface 11 a of the first side wall 11 , respectively.

[0183] See also Figure 8 , Fig. 9 and Fig.14 The side surface 221b of the second sub-section 221 is in contact with the first side wall 11, so that the gas discharged through the first exhaust port 1b is all gas filtered by the second sub-section 221. The gas can continue to flow to the first exhaust port 1b only after passing through the second sub-section 221, thereby ensuring the second sub-section 221's blocking and filtering effect on particulate matter in the airflow.

[0184] In some embodiments, Fig.15 As shown, the second sub-section 221 includes a first filter layer 2211 , the first filter layer 2211 includes two opposite main surfaces 2211 a and a plurality of second through holes 2211 c , and the second through holes 2211 c penetrate the two opposite main surfaces 2211 a of the first filter layer 2211 .

[0185] When the gas flows through the second sub-section 221, the particulate matter carried in the gas is intercepted and filtered by the second through holes 2211c on the first filter layer 2211, and the particulate matter carried in the battery pack gas is intercepted to the surface of the first filter layer 2211, thereby achieving physical filtration of the gas.

[0186] Exemplarily, the shape of the second through hole 2211c can be circular, quasi-circular, elliptical or quasi-elliptical, etc., or can be a polygon such as a triangle, rectangle, oblong, rhombus, trapezoid, parallelogram, pentagon, hexagon, etc.

[0187] When the second through hole 2211c is circular, the equivalent diameter of the second through hole 2211c refers to the diameter of the circle; when the second through hole 2211c is other shapes, the equivalent diameter of the second through hole 2211c refers to the diameter of the largest sphere that can pass through the second through hole 2211c.

[0188] In other embodiments, Fig.16 As shown, the first filter layer 2211 includes a first filter material 2211d and a first substrate 2211e for supporting the first filter material 2211d.

[0189] The first filter material 2211d can be used to filter particles with a particle size of 5 microns or more. When the gas passes through the first filter material 2211d, particles with a size greater than or equal to 5 microns are blocked and filtered by the first filter material 2211d. In this case, the first filter material 2211d can be a chemical fiber non-woven fabric.

[0190] The first filter material 2211d can also be used to filter particles with a particle size of 0.5 microns or more. When the gas passes through the first filter material 2211d, particles with a size greater than or equal to 0.5 microns are blocked and filtered by the first filter material 2211d. In this case, the first filter material 2211d can be made of synthetic fibers and glass fibers.

[0191] The first filter material 2211d has a low wind resistance, so that the gas has a large wind volume and low resistance when passing through the first filter material 2211d. The first filter material 2211d has a large dust holding capacity and can better filter and adsorb particulate matter carried in the gas.

[0192] The first substrate 2211e may be a wire mesh provided on the surface of the first filter material 2211d. The first substrate 2211e is provided to fix and protect the first filter material 2211d, thereby preventing the first filter material 2211d from being easily damaged during use.

[0193] Based on this, the first filter layer 2211 may further include an outer frame, which surrounds the first filter material 2211d surface and the substrate, and is used to connect and fix the edge portions of the first filter material 2211d surface and the substrate, so that the first filter material 2211d surface and the substrate can be fixed at a set position, preventing the first filter material 2211d surface from being separated from the substrate, and ensuring that the substrate can maintain effective support for the first filter material 2211d surface. The outer frame may be made of aluminum alloy, galvanized sheet, paper frame or stainless steel.

[0194] In some embodiments, Fig.15 As shown, the surface roughness of the first filter layer 2211 at least facing the first filter element 21 is less than or equal to 10 microns.

[0195] The surface of the first filter layer 2211 facing the first filter element 21 is called the filter surface of the first filter layer 2211. The low surface roughness of the filter surface of the first filter layer 2211 helps to reduce the adhesion and clogging of particles on the surface of the first filter layer 2211, improve the filtration efficiency, and reduce the gas flow resistance. The surface roughness of the filter surface of the first filter layer 2211 is less than or equal to 10 microns. In this way, since the filter surface of the first filter layer 2211 is relatively smooth, the particles intercepted by the first filter 2211 will slide along the filter surface of the first filter layer 2211 to the side of the second sub-section 221 close to the first exhaust port 1b, and will not cover the filter surface of the first filter layer 2211 in a large area, thereby preventing the problem of particle clogging on the surface of the first filter layer 2211 and ensuring the filtration effect of the first filter layer 2211.

[0196] Exemplarily, the surface roughness of the remaining surfaces of the first filter layer 2211 may be the same as the surface roughness of the filter surface of the first filter layer 2211 .

[0197] Exemplarily, the surface roughness of the filtering surface of the first filter layer 2211 can be 0.05 microns, 0.1 microns, 0.3 microns, 0.6 microns, 1 micron, 3 microns, 5 microns, 6.3 microns, 8 microns or 10 microns, etc.

[0198] The surface roughness of the filter surface of the first filter layer 2211 may be in the range of 0.05 μm to 10 μm, or 0.4 μm to 0.8 μm. The surface roughness of the first filter layer 2211 may be adaptively designed according to specific application scenarios and filtering requirements, which is only used as an exemplary description of some possible implementations of the present application and is not intended to limit the present application.

[0199] In some embodiments, Fig.15 As shown, at least the surface of the first filter layer 2211 facing the first filter element 21 is coated with an antistatic agent and / or a static dissipating agent.

[0200] The surface of the first filter layer 2211 is relatively smooth and has additives, so particles will not stick to the first filter layer 2211, but will slide down along the surface of the first filter layer 2211 and accumulate at the lowest point of the second filter element 22, preventing particles from accumulating on the second filter element 22 and causing clogging of the filter material.

[0201] In some embodiments, Fig.15 As shown, the second sub-section 221 also includes: a second filter layer 2212 disposed on a side of the first filter layer 2211 away from the first filter element 21, and the second filter layer 2212 includes a high temperature resistant fiber material. The second filter layer 2212 is configured to block and adsorb particulate matter; the size of the particulate matter is greater than or equal to 0.1 microns.

[0202] The second filter layer 2212 can be a filter element or filter paper. The second filter layer 2212 is made of high temperature resistant fiber material and has adsorption and filtration effects. The adsorption characteristics of the second filter layer 2212 adsorb small particles onto the second filter layer 2212. In the process of the gas passing through the second sub-section 221, the first filtration is performed on the first filter layer 2211, and the second filtration is performed on the second filter layer 2212, so as to further filter and remove the particles carried in the gas.

[0203] The first filter layer 2211 and the second filter layer 2212 are used to filter particles of different sizes. Larger particles are filtered out by the first filter layer 2211, which can avoid the problem of excessive accumulation of particles on the surface of the second filter layer 2212, resulting in reduced air permeability and affecting the filtering effect of the second filter layer 2212. The second filter layer 2212 further filters smaller particles and improves the filtering effect on particles through graded filtration.

[0204] In some embodiments, Fig.15 As shown, the second filter layer 2212 is configured to adsorb harmful chemicals in the air and / or convert harmful chemicals in the air into harmless substances.

[0205] Exemplarily, at least the surface of the second filter layer 2212 facing the first filter layer 2211 is coated with a chemical reagent, for example, a catalyst such as zirconium oxide, manganese oxide, etc., so that the second filter layer 2212 can absorb at least one of organic matter, nitrogen oxides and carbon monoxide in the gas, or convert at least one of organic matter, nitrogen oxides and carbon monoxide in the gas into at least one of carbon dioxide, water and nitrogen.

[0206] The second filter layer 2212 includes at least one of activated carbon, volcanic rock, heat-resistant foam, and foam metal. The second filter layer 2212 is used to adsorb harmful gases, and / or the second filter layer 2212 includes a porous multi-layer mesh support with a certain strength such as ceramic, alumina or metal as a substrate, and a catalyst such as zirconium oxide and manganese oxide is coated on the surface of the substrate to harmlessly convert harmful substances.

[0207] Of course, the second filter layer 2212 may also be made of other materials or structures, which are merely examples of some possible implementations and are not intended to limit the present application.

[0208] The second filter layer 2212 can specially treat harmful chemicals in the gas. When the airflow passes through the second filter layer 2212, some particles carried in the airflow will be blocked and adsorbed by the second filter layer 2212. At the same time, the second filter element 22 can also absorb and catalyze harmful gases in the airflow, filter the harmful gases carried in the airflow or convert them into harmless substances.

[0209] The first filter element 21 and the second filter element 22 provided in the filter assembly 2 form a graded filtering system to achieve a comprehensive purification effect. The first filter element 21 is mainly used to filter larger particles, while the second filter element 22 is used to filter and adsorb smaller particles, as well as adsorb and convert harmful chemicals. Such a design can ensure that when processing the airflow, the particles are first physically filtered, and then the chemical pollutants in the gas are processed, thereby improving the overall purification efficiency.

[0210] Thermal runaway of battery 30 may generate CO, C 2 H 4 , CH 4 , H 2 The generated CO is converted into CO after passing through the filter component 2 of the purification device 10. 2 , C 2 H 4 and CH 4 etc. are converted into water and CO 2 The gas discharged from the box assembly 20 does not carry harmful gases, ensuring the personal safety of the driver and passengers; the H generated by the thermal runaway of the battery 2 It is converted into water in the purification device 10, so as to avoid the flammable and explosive substances in the gas discharged from the box assembly 20, which may cause hidden dangers to vehicle safety; the nitrogen oxides and other combustion-supporting substances produced by the thermal runaway of the battery can also be converted into water and nitrogen in the purification device 10, so as to effectively avoid the combustion-supporting substances in the gas discharged from the box assembly 20, which may cause hidden dangers to vehicle safety.

[0211] In some embodiments, Fig.15 As shown, the second sub-section 221 also includes: a third filter layer 2213 arranged on the side of the second filter layer 2212 away from the first filter layer 2211, the third filter layer 2213 includes two opposite main surfaces 2213a and a plurality of third through holes 2213c, and the third through holes 2213c penetrate the two opposite main surfaces 2213a of the third filter layer 2213.

[0212] The first filter layer 2211 and the third filter layer 2213 sandwich the second filter layer 2212 to support the second filter layer 2212 while filtering particulate matter.

[0213] In other embodiments, Fig.16As shown, the third filter layer 2213 includes a second filter material 2213d and a second substrate 2213e for supporting the second filter material 2213d.

[0214] The material selection and specific configuration of the second filter material 2213d and the second substrate 2213e can refer to the above description of the first filter material 2211d and the first substrate 2211e, which will not be repeated here.

[0215] Fig.15 and Fig.16 This is a structural diagram of the second sub-unit 221 of some embodiments of the present application. In order to clearly show the specific structure of the second sub-unit 221, Fig.15 and Fig.16 The first filter layer 2211 , the second filter layer 2212 and the third filter layer 2213 are spaced apart from each other, but in the actual second sub-section 221 , the first filter layer 2211 , the second filter layer 2212 and the third filter layer 2213 are in contact with each other.

[0216] Based on the above, in some embodiments, such as Fig.14 , Fig.15 and Fig.16 As shown, two sides of the second filter layer 2212 are in contact with the first filter layer 2211 and the third filter layer 2213 respectively.

[0217] The first filter layer 2211 , the second filter layer 2212 and the third filter layer 2213 fit together to improve the filtering effect.

[0218] In some embodiments, Fig.15 As shown, the equivalent diameter of the third through hole 2213c is the same or substantially the same as that of the second through hole 2211c.

[0219] The first filter layer 2211 and the third filter layer 2213 are mainly used to support the second filter layer 2212. The opening on the third filter layer 2213 cannot be too small to ensure a good air permeability effect, nor can it be too large to ensure effective support for the second filter layer 2212. The third through hole 2213c and the second through hole 2211c can be designed in the same manner. Of course, under the condition of ensuring the support effect of the third filter layer 2213, the aperture of the third through hole 2213c can also be larger than the aperture of the second through hole 2211c, so as to increase the permeation area allowing airflow to flow through, reduce the resistance to airflow, and ensure the airflow rate of the gas passing through the third filter layer 2213.

[0220] In some embodiments, Fig.15 As shown, the hardness of the first filter layer 2211 is greater than the hardness of the second filter layer 2212.

[0221] The first filter layer 2211 has a high hardness. While effectively supporting the second filter layer 2212, it can also withstand the impact of airflow, prevent the second filter layer 2212 from shifting, being damaged, etc. under the impact of airflow, and ensure the filtering effect.

[0222] In some embodiments, the hardness of the third filter layer 2213 is greater than the hardness of the second filter layer 2212 .

[0223] Compared with the second filter layer 2212 , the first filter layer 2211 and the third filter layer 2213 are made of materials with greater hardness, and can better support the second filter layer 2212 .

[0224] In some embodiments, Fig.17 As shown, the filter assembly 2 further includes: a third filter element 23 disposed on a side of the second filter element 22 away from the first filter element 21 , and the third filter element 23 includes a plurality of fourth through holes 23c penetrating the second filter layer 2212 along the second direction Y.

[0225] like Fig.13 and Fig.17 As shown, one end of the second sub-portion 221 of the second filter element 22 contacts the third filter element 23 , and the other end contacts the first filter element 21 .

[0226] The high-temperature airflow generated by the thermal runaway of the battery 30 has been converted into harmless gas after passing through the second filter element 22. Most of the particulate matter has been adsorbed by the filter element, leaving only a small part of smaller particles (particles with a size less than 0.1 microns). After the third filtration through the third filter element 23, it is discharged from the first exhaust port 1b. At this time, the gas has been converted into clean and harmless gas, which can better protect the safety of the driver and passengers.

[0227] The third filter element 23 can be a plate made of hard material with a fourth through hole 23c on the surface. In this way, the third filter element 23 can not only play a role, but also support the first filter element 21 and the second filter element 22 to prevent the first filter element 21 and the second filter element 22 from shifting under the impact of airflow, so that the filter assembly 2 can be maintained in the expected position, thereby ensuring the filtering effect of the gas in the filter assembly 2.

[0228] Based on the foregoing, the high-temperature gas generated after the thermal runaway of the battery 30 has undergone airway collision, two physical filtrations and one chemical reaction, and the impact force of the gas on the third filter element 23 is relatively small. Therefore, the third filter element 23 may also include a third filter material, and the third filter material may be the same as the aforementioned first filter material 2211d, which will not be elaborated here.

[0229] Of course, when the third filter element 23 includes a third filter material, the third filter element 23 may also include a third substrate. The arrangement and material selection of the third substrate and the third filter material may be the same as those of the first substrate 2211e and the first filter material 2211d, and will not be elaborated here.

[0230] Fig.17 This is a structural diagram of the filter assembly 2 and the support member 3 of some embodiments of the present application. In order to clearly show the specific structure of the support member 3, Fig.17 The filter assembly 2 and the support member 3 are spaced apart from each other, but in the actual purification device 10, the filter assembly 2 and the support member 3 are in contact with each other.

[0231] In some embodiments, Fig.17 As shown, the purification device 10 further includes: a support member 3 disposed in the first cavity Q1, and the two ends of the support member 3 along the first direction X respectively extend to the two ends of the first side wall 11 along the first direction X, and are flush or substantially flush with the end of the first side wall 11. Along the second direction Y, the support member 3 is farther away from the first air inlet 1a of the housing assembly 1 than the purification device 10, and the support member 3 is in contact with the purification device 10.

[0232] Exemplarily, the support member 3 includes a plurality of hollow portions; or, the support member 3 includes a breathable material.

[0233] The support member 3 may be made of a metal grid or metal sheet with an open hole or a perforated structure, or the support member 3 may be made of a porous ceramic material with a microporous structure.

[0234] By providing the support member 3, the filter assembly 2 as a whole can be fixed and supported.

[0235] Exemplarily, the support member 3 includes two side surfaces 3 b opposite to each other along the third direction Z, and the two opposite side surfaces 3 b of the support member 3 are in contact with the inner surface 11 a of the first side wall 11 , respectively.

[0236] The side surface 3 b of the support member 3 may be connected to the first side wall 11 , so that the connection stability between the support member 3 and the first side wall 11 is better, so that the support member 3 can better support the filter assembly 2 .

[0237] In combination with the foregoing, the purification device 10 provided in some embodiments of the present application, when applied to the power supply system 100, can, on the one hand, serve as a supporting longitudinal beam (or transverse beam, which is related to the specific arrangement of the purification device 10 in the box body 20) of the box body assembly 20, and on the other hand, through the filtering and adsorption characteristics of the filter component 2 in the purification device 10, it can also filter the gas in the accommodating cavity 2011 of the box body assembly 20 (including flue gas, and particulate matter and harmful chemicals carried in the gas, etc.), to ensure that the gas discharged from the box body assembly 20 is clean gas, and when the gas in the accommodating cavity 2011 is discharged from the box body assembly 20 after passing through the purification device 10, the temperature of the gas can also be reduced to within the expected range, thereby avoiding the safety risks that may be caused by the discharge of high-temperature gas.

[0238] By designing the structure of the filter assembly 2, it is possible to avoid the problem of particulate accumulation causing the purification device 10 to fail or the filtration efficiency to decrease. At the same time, when multiple (two or more) purification devices 10 are arranged in the box 20, even if one of the purification devices 10 fails and the filtration efficiency decreases, the other purification devices 10 can still perform effective filtration, thereby improving the reliability of the purification device 10.

[0239] After the pressure relief component 40 is blocked, the pressure relief component 40 loses its original pressure relief function, and the box component 20 cannot quickly reduce pressure, which poses a risk of explosion. By providing the purification device 10, the ejected matter after the thermal runaway of the battery 30 can be filtered by the filter component 2 and remain in the purification device 10, effectively preventing the ejected matter from flowing to the exhaust port 20b of the box 20 with the air flow, thereby avoiding the risk caused by the blockage of the pressure relief component 40.

[0240] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A purification device, characterized in that: include: The housing assembly comprises a first side wall; the first side wall encloses a first cavity; Along the first direction, one end of the housing assembly includes a first air inlet, and the other end includes a first air outlet; The first air inlet and the first air outlet are both connected to the first cavity; A filter assembly is arranged in the first cavity, and the first air inlet and the first exhaust port are respectively located on both sides of the filter assembly along the second direction; the filter assembly includes a first filter element; the first filter element includes a first filter plate extending along the first direction; the first filter plate includes two main surfaces opposite to each other along the second direction, two side surfaces opposite to each other along the third direction and a plurality of first through holes, the first direction, the second direction and the third direction intersect with each other, the first through holes penetrate the two opposite main surfaces of the first filter plate, and the two opposite side surfaces of the first filter plate are in contact with the inner surface of the first side wall; the two ends of the first filter plate along the first direction respectively extend to the two ends of the first side wall along the first direction, and are flush or substantially flush with the end of the first side wall.

2. The purification device according to claim 1, characterized in that: The first filter element further comprises: At least one baffle is arranged on the first filter plate and is located on the same side of the first filter plate along the second direction as the first air inlet; the first end of the baffle is connected to the first filter plate, and a first gap is formed between the second end of the baffle and the first side wall.

3. The purification device according to claim 2, characterized in that: The baffle includes two side surfaces opposite to each other along the third direction; The two opposite side surfaces of the baffle are in contact with the inner surface of the first side wall respectively; or, A second interval is provided between the side surface of the baffle and the first side wall, and the second interval is smaller than or equal to the first interval.

4. The purification device according to claim 2 or 3, characterized in that: The first filter element includes n baffles arranged along the first direction; n is a positive integer greater than or equal to 1; Among the n baffles, the heights of the baffles gradually increase along the first direction and along the direction from the first air inlet to the first air outlet; the height of the baffle refers to the size of the baffle along the second direction.

5. The purification device according to claim 4, characterized in that: The n baffles divide the first filter plate into n+1 first sub-sections, and each of the first sub-sections includes a plurality of the first through holes; Among the n+1 first sub-sections, the equivalent diameter of the first through hole included in each first sub-section is the same or approximately the same, and the equivalent diameter of the first through hole included in the first sub-section gradually decreases along the first direction and along the direction from the first air inlet to the first exhaust port.

6. The purification device according to claim 5, characterized in that: The interval between any one of the n baffles and the first side wall is less than or equal to the equivalent diameter of the first through hole on the first sub-portion of the baffle close to the first air inlet; and / or, The interval between any one of the n baffles and the first side wall is greater than or equal to the equivalent diameter of the first through hole on the first sub-portion of the baffle on the side close to the first exhaust port.

7. The purification device according to claim 1, characterized in that: in, The filter assembly also includes: The second filter element is arranged on a side of the first filter element close to the first exhaust port; the second filter element includes a second sub-portion extending in the first direction, and the second sub-portion extends to the two ends of the first side wall along the first direction respectively, and is flush or approximately flush with the end of the first side wall.

8. The purification device according to claim 1, characterized in that: The filter assembly also includes: A second filter element is disposed on a side of the first filter element close to the first exhaust port; the second filter element comprises a plurality of second sub-sections sequentially connected along the first direction; Among the plurality of second sub-sections, at least one of the second sub-sections is in line contact with the first filter plate; and / or, Among the plurality of second sub-sections, at least one of the second sub-sections is in surface contact with the first filter plate.

9. The purification device according to claim 8, characterized in that: The second filter element is cross-sectioned along a plane parallel to the first direction and the second direction, and the resulting cross-sectional shape is a broken line shape, a wave shape, or a "bow" shape.

10. The purification device according to claim 8, characterized in that: Among the plurality of second sub-portions, ends of two outermost second sub-portions along the first direction are flush or substantially flush with an end of the first side wall.

11. The purification device according to claim 7 or 8, characterized in that: in, The second sub-portion includes two side surfaces that are opposite to each other along the third direction, and the two opposite side surfaces of the second sub-portion are in contact with the inner surface of the first side wall, respectively.

12. The purification device according to claim 11, characterized in that: The second subsection comprises: The first filter layer includes two opposite main surfaces and a plurality of second through holes; the second through holes penetrate the two opposite main surfaces of the first filter layer.

13. The purification device according to claim 12, characterized in that: At least the surface of the first filter layer facing the first filter element is coated with an antistatic agent and / or a static dissipating agent.

14. The purification device according to claim 12, characterized in that: The second subsection also includes: The second filter layer is arranged on the side of the first filter layer away from the first filter element; the second filter layer includes a high temperature resistant fiber material; the second filter layer is configured to block and adsorb particulate matter; the size of the particulate matter is greater than or equal to 0.1 microns.

15. The purification device according to claim 14, characterized in that: The second filter layer is configured to adsorb harmful chemicals in the air and / or convert harmful chemicals in the air into harmless substances.

16. The purification device according to claim 14, characterized in that: The second subsection also includes: The third filter layer is arranged on a side of the second filter layer away from the first filter layer; the third filter layer comprises two opposite main surfaces and a plurality of third through holes, and the third through holes penetrate the two opposite main surfaces of the third filter layer.

17. The purification device according to claim 16, characterized in that: Both sides of the second filter layer are in contact with the first filter layer and the third filter layer respectively.

18. The purification device according to claim 16, characterized in that: The equivalent diameter of the third through hole is the same or substantially the same as that of the second through hole.

19. The purification device according to claim 16, characterized in that: The hardness of the first filter layer is greater than the hardness of the second filter layer.

20. The purification device according to claim 7 or 8, characterized in that: The filter assembly also includes: a third filter element, disposed on a side of the second filter element away from the first filter element; the third filter element comprises a plurality of fourth through holes penetrating the second filter layer along the second direction; One end of the second sub-portion of the second filter element contacts the third filter element, and the other end contacts the first filter element.

21. The purification device according to claim 1, characterized in that: The purification device also includes: a support member disposed in the first cavity; two ends of the support member along the first direction respectively extend toward two ends of the first side wall along the first direction, and are flush or substantially flush with the end of the first side wall; along the second direction, the support member is farther away from the first air inlet of the housing assembly than the purification device, and the support member is in contact with the purification device; The support member includes a plurality of hollow parts; or, The support member includes a breathable material.

22. The purification device according to claim 21, characterized in that The support member includes two side surfaces that are opposite to each other along the third direction, and the two opposite side surfaces of the support member are in contact with the inner surface of the first side wall, respectively.

23. The purification device according to claim 1, characterized in that: The purification device also includes: A first connecting member is disposed on one side of the housing component along the first direction; the first connecting member is disposed in the first cavity and connected to the inner wall of the first cavity; A second connecting member is disposed on the other side of the housing assembly along the first direction; the second connecting member is disposed in the first cavity and connected to the inner wall of the first cavity; The first connecting member and the second connecting member seal the ends of the first cavity, and the first air inlet and the first air outlet are arranged on the first side wall.

24. The purification device according to claim 1, characterized in that The purification device also includes: A first connecting member is disposed on one side of the housing assembly along the first direction; the first connecting member is disposed on the outside of the first cavity and connected to the end surface of the first cavity; the first air inlet is disposed on the first connecting member; The second connecting member is arranged on the other side of the shell component along the first direction; the second connecting member is arranged on the outside of the first cavity and connected to the end surface of the first cavity; the first exhaust port is arranged on the second connecting member.

25. A power supply system, characterized in that: include: The box assembly comprises a first box; the first box comprises a containing cavity; A battery is disposed in the accommodating cavity; At least one purification device as described in any one of claims 1 to 24 is arranged in the accommodating chamber; the first air inlet of the purification device is connected to the accommodating chamber, and the first exhaust port of the purification device is connected to the exhaust port of the box assembly.

26. The power supply system according to claim 25, characterized in that: The box assembly also includes: The first air duct is arranged in the accommodating chamber; the first air duct includes a second air inlet and a second air outlet, the second air inlet is connected to the accommodating chamber; the second air outlet is connected to the first air inlet of the purification device.

27. The power supply system according to claim 25, characterized in that: The box assembly also includes: The second box body is arranged on one side of the first box body; the second box body includes a second air duct, and the second air duct includes a third air inlet and a third exhaust port, the third air inlet is connected to the first exhaust port of the purification device, and the third exhaust port is connected to the exhaust port of the box body assembly.

28. The power supply system according to any one of claims 25 to 27, characterized in that: The box assembly also includes: A pressure relief assembly is connected to the exhaust port of the box assembly; the pressure relief assembly is configured to close when the pressure in the box assembly is less than a set threshold, and to open when the pressure in the box assembly is greater than or equal to the set threshold, so as to discharge the gas in the box assembly.

29. A vehicle, characterized in that: include: Vehicle body; The power supply system according to any one of claims 25 to 28 is arranged in the vehicle body.

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