Battery pack and electric device

Abstract

The invention discloses a battery pack and a power utilization device, the battery pack comprises a box body, single batteries and a filtering assembly, the box body is provided with a containing cavity and an exhaust channel, and the exhaust channel is arranged on one side of the containing cavity and communicates with the containing cavity; the single battery is arranged in the accommodating cavity and comprises a pressure relief piece, and the pressure relief piece is configured to start pressure relief in the exhaust channel when the single battery is in thermal runaway; the filtering assembly is arranged in the exhaust channel and is configured to filter poisonous gas when the pressure relief piece is opened. By arranging the exhaust channel on the box body, gas exhausted by thermal runaway of the battery monomers can be diffused and depressurized in the exhaust channel, a circulation path is provided for the gas, and meanwhile, the filter assembly is arranged in the exhaust channel to filter toxic and harmful gas in the gas; the harm to human bodies and the environment after the thermal runaway gas is discharged out of the battery pack is reduced, so that the safety is improved.

Description

Technical Field

[0001] This application belongs to the technical field of batteries, and particularly relates to a battery pack and an electrical device. Background Art

[0002] When one or more battery cells in a battery pack experience thermal runaway, in addition to generating high temperatures and ejecting impurities such as flames, soot, and contents, a large amount of gas is also produced. This gas contains toxic and harmful gases such as carbon monoxide, ethylene, and ethane. When a battery cell undergoes thermal runaway, the explosion-proof valve opens, and the high-pressure gas generated will be discharged outside the battery pack through the exhaust valve on the battery pack, and to a large extent, it will flow into the cockpit and the external air environment of the vehicle, posing a great threat to human safety. Summary of the Invention

[0003] Object of the Invention: Embodiments of this application provide a battery pack, aiming to solve the problem that the thermal runaway gas of the existing battery pack is directly discharged outside the battery pack, posing a great threat to the safety of surrounding personnel; another object of the embodiments of this application is to provide an electrical device.

[0004] Technical Solution: A battery pack according to an embodiment of this application includes:

[0005] A box body, having a receiving cavity and an exhaust passage, the exhaust passage is disposed on one side of the receiving cavity and is in communication with the receiving cavity;

[0006] Battery cells, disposed in the receiving cavity, the battery cells include a pressure relief member, and the pressure relief member is configured to open and relieve pressure into the exhaust passage when the battery cells experience thermal runaway;

[0007] A filtering assembly, disposed in the exhaust passage, and the filtering assembly is configured to filter toxic gases when the pressure relief member opens.

[0008] In some embodiments, the battery pack has an intersecting first direction and a second direction, and the box body includes:

[0009] A bottom plate assembly, having a first passage and a first through hole, the first through hole penetrates through the side of the bottom plate assembly facing the receiving cavity along the first direction, and the first passage is in communication with the receiving cavity through the first through hole; the battery cells are connected to the bottom plate assembly and seal the first through hole, and at least a part of the orthographic projection of the pressure relief member on the bottom plate assembly along the first direction is located in the first through hole;

[0010] A first plate member is disposed on one side of the accommodating cavity along the second direction; the first plate member is connected to the bottom plate assembly and is used to enclose the accommodating cavity; the first plate member has a second channel and a second through hole, the second channel is communicated with the first channel and is used to form the exhaust channel, and at least a part of the filtering assembly is disposed in the second channel; the second through hole penetrates through the side of the first plate member away from the accommodating cavity along the second direction and is communicated with the second channel;

[0011] An exhaust valve is embedded in the second through hole and is hermetically connected to the first plate member.

[0012] In some embodiments,

[0013] The battery pack has a third direction intersecting with the first direction and the second direction. The box body includes two second plate members oppositely disposed along the third direction. The second plate members are respectively connected to the first plate member and the bottom plate assembly and are used to enclose the accommodating cavity; the second plate members have a third channel and a third through hole, the third channel is communicated with the first channel through the third through hole, and the third channel penetrates through the side of the second plate member facing the first plate member along the first direction;

[0014] The first plate member has a plurality of fourth through holes spaced along the third direction. The fourth through holes penetrate through the side of the first plate member facing the accommodating cavity along the second direction. The second plate member is connected to the first plate member and covers the fourth through holes; the third channel is communicated with the second channel through the fourth through holes; the first channel, the second channel and the third channel are communicated to form the exhaust channel;

[0015] The filtering assembly includes a first filter element and a second filter element. The first filter element is disposed in the second channel, and the second filter element is disposed in the third channel.

[0016] In some embodiments, the first plate member includes a first partition plate. The first partition plate is disposed in the second channel to divide the second channel into a first sub-channel and a second sub-channel arranged along the first direction; the second through hole penetrates through the side wall of the first sub-channel away from the accommodating cavity and is communicated with the first sub-channel. Both the first sub-channel and the second sub-channel are communicated with the fourth through holes; the first filter element is disposed in the first sub-channel.

[0017] In some embodiments,

[0018] The second plate member includes a plurality of second partition plates, and the plurality of second partition plates are arranged at intervals in the first direction for partitioning the third channel into a plurality of third sub-channels arranged in the first direction; the third through hole communicates with the third sub-channel closest to the bottom plate assembly;

[0019] The filtering assembly includes a plurality of the second filtering members, and each second filtering member is disposed in one of the third sub-channels.

[0020] In some embodiments,

[0021] The first plate member includes a first limiting member, the first limiting member is disposed in the first sub-channel and connected to the first partition plate, and the first filtering member is disposed between the first limiting member and the side wall of the first sub-channel along the second direction;

[0022] The second plate member includes a plurality of second limiting members, each second limiting member is disposed in one of the third sub-channels and connected to one of the second partition plates, and the second filtering member is disposed between the second limiting member and the side wall of the third sub-channel along the third direction.

[0023] In some embodiments,

[0024] The box body further includes a third plate member, the third plate member is spaced apart from the first plate member along the second direction, and the third plate member is respectively connected to the two second plate members and the bottom plate assembly to enclose the accommodation cavity; the third plate member has a fourth channel and a plurality of fifth through holes arranged at intervals in the third direction, the fifth through holes penetrate through the side of the third plate member facing the second plate member along the second direction and communicate with the fourth channel;

[0025] The second plate member covers the fifth through hole, the second channel penetrates through the side of the second plate member away from the first plate member along the second direction, and the second channel communicates with the fifth through hole; the first channel, the second channel, the third channel and the fourth channel communicate with each other to form the exhaust channel.

[0026] In some embodiments, along the second direction, one of the adjacent two second partition plates is connected to the first plate member and spaced apart from the third plate member; the other of the adjacent two second partition plates is connected to the third plate member and spaced apart from the first plate member.

[0027] In some embodiments, the first filtering member has a sixth through hole, the sixth through hole penetrates through the first filtering member along the second direction, the sixth through hole communicates with the second through hole, and the aperture of the sixth through hole is larger than the aperture of the second through hole.

[0028] In some embodiments, the bottom plate assembly includes:

[0029] A bottom guard plate, which is respectively connected to the first plate member, the third plate member and the two second plate members, and is used to enclose the accommodation cavity;

[0030] A liquid cooling plate, which has the first through hole, is respectively connected to the first plate member, the third plate member and the two second plate members, and encloses the first channel with the bottom guard plate; the liquid cooling plate is arranged between the battery cell and the bottom guard plate and is connected to the battery cell.

[0031] In some embodiments, the bottom plate assembly further includes a separation plate, which is arranged between the bottom guard plate and the liquid cooling plate and is connected to the liquid cooling plate; the separation plate is configured to separate solid substances and gaseous substances when the pressure relief member sprays.

[0032] In some embodiments, the battery pack has a third direction intersecting with the first direction and the second direction, and the separation plate includes:

[0033] A first plate body, which is connected to the side of the liquid cooling plate away from the battery cell, and the first plate body has a seventh through hole, and the seventh through hole is communicated with the first through hole;

[0034] A second plate body, which is arranged at an interval from the first plate body along the first direction; the second plate body has an eighth through hole, and the eighth through hole is arranged in a dislocation manner with the seventh through hole along the first direction, and the eighth through hole is communicated with the first channel;

[0035] A plurality of first baffles, which are arranged at intervals along the third direction; the first baffles are respectively connected to the first plate body and the second plate body, and at least one first cavity and a plurality of second cavities are formed by the first baffles, the first plate body and the second plate body, at least one of the first cavities and the plurality of second cavities are arranged in a row along the third direction, and one of the second cavities is arranged on each side of each first cavity; the first cavity is communicated with the seventh through hole, and the second cavity is communicated with the eighth through hole; a ninth through hole is arranged on the side of the first baffle close to the first plate body, and the ninth through hole penetrates through the first baffle along the third direction, and the ninth through hole is respectively communicated with the first cavity and the second cavity.

[0036] In some embodiments, the separation plate further includes a plurality of second baffles spaced along the third direction. At least two of the second baffles are disposed in one of the first cavities. At least two of the second baffles are respectively disposed on two sides of the seventh through hole along the third direction. The second baffles are connected to the first plate body and are spaced from the second plate body; the second baffles are spaced from the first baffles; the orthographic projection of the second baffles on the first baffles along the third direction covers the ninth through hole.

[0037] In some embodiments, the filtering assembly includes a third filter element disposed between the separation plate and the bottom guard plate and connected to the bottom guard plate.

[0038] In some embodiments,

[0039] The filtering assembly includes a plurality of the third filter elements, and the plurality of third filter elements are arranged in an array and are all connected to the bottom guard plate;

[0040] The bottom plate assembly further includes a plurality of positioning members spaced along the first direction. Along the first direction, one positioning member is disposed between two adjacent third filter elements; the positioning member includes a connecting portion and a positioning portion. The connecting portion is connected to a side of the positioning portion facing the bottom guard plate, and a side of the connecting portion away from the positioning portion is connected to the bottom guard plate; along the first direction, the plurality of third filter elements and the plurality of connecting portions are alternately arranged, and the size of the positioning portion is larger than that of the connecting portion; along the second direction, a part of the third filter element is disposed between the positioning portion and the bottom guard plate and is respectively connected to the positioning portion and the bottom guard plate.

[0041] In some embodiments, the filtering assembly is impregnated activated carbon impregnated with sodium hydroxide or ammonia water.

[0042] Correspondingly, an electrical device according to an embodiment of the present application includes a battery pack as described in any one of the foregoing embodiments.

[0043] Beneficial effects: Compared with the prior art, a battery pack according to an embodiment of the present application includes a box body, battery cells, and a filtering component. The box body has a receiving cavity and an exhaust passage. The exhaust passage is provided on one side of the receiving cavity and is in communication with the receiving cavity. The battery cells are arranged in the receiving cavity. Each battery cell includes a pressure relief member configured to open and relieve pressure into the exhaust passage when the battery cell undergoes thermal runaway. The filtering component is arranged in the exhaust passage and is configured to filter toxic gases when the pressure relief member opens. By providing the exhaust passage on the box body, the present application can diffuse and reduce the pressure of the gas discharged during the thermal runaway of the battery cells in the exhaust passage, provide a flow path for the gas, and at the same time, arrange the filtering component in the exhaust passage to filter the toxic and harmful gases in the gas, reducing the harm caused to the human body and the environment after the thermal runaway gas is discharged from the battery pack, thereby improving safety.

[0044] Compared with the prior art, an electrical device according to an embodiment of the present application includes a battery pack as described in any one of the foregoing embodiments. It can be understood that the electrical device according to the embodiment of the present application includes all the technical features and technical effects of the foregoing embodiments, which will not be elaborated herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0046] Figure 1 is an overall structural schematic diagram of a battery pack according to an embodiment of the present application;

[0047] Figure 2 is an exploded view of a battery pack according to an embodiment of the present application;

[0048] Figure 3 is a schematic cross-sectional view of a battery pack according to an embodiment of the present application perpendicular to the second direction;

[0049] Figure 4 is Figure 3 an enlarged view of part A in

[0050] Figure 5 is Figure 3 an enlarged view of part B in

[0051] Figure 6 is a schematic cross-sectional view of a battery pack according to an embodiment of the present application perpendicular to the third direction;

[0052] Figure 7 is a structural schematic diagram of a first plate member according to an embodiment of the present application;

[0053] Figure 8 is a cross-sectional view of a first plate member according to an embodiment of the present application;

[0054] Figure 9 is a schematic structural diagram of a third plate member according to an embodiment of the present application;

[0055] Figure 10 is a schematic structural diagram of a separation plate according to an embodiment of the present application;

[0056] Figure 11 is a bottom view of a separation plate according to an embodiment of the present application;

[0057] Figure 12 is a cross-sectional view of a separation plate according to an embodiment of the present application;

[0058] Figure 13 is Figure 12 an enlarged view of part C in

[0059] Figure 14 is a schematic structural diagram of an assembly of a second plate member and a second filter member according to an embodiment of the present application;

[0060] Figure 15 Schematic structural diagram of a first filter member according to an embodiment of the present application;

[0061] Figure 16 is a cross-sectional view of a second plate member according to an embodiment of the present application.

[0062] Reference numerals: 1, box body; 11, accommodation cavity; 12, exhaust passage; 13, bottom plate assembly; 131, first passage; 132, first through hole; 133, bottom guard plate; 134, liquid cooling plate; 135, separation plate; 1351, first plate body; 13511, seventh through hole; 1352, second plate body; 13521, eighth through hole; 1353, first baffle; 13531, ninth through hole; 1354, first cavity; 1355, second cavity; 1356, second baffle; 136, positioning member; 1361, connecting portion; 1362, positioning portion; 14, first plate member; 141, second passage; 1411, first sub-passage; 1412, second sub-passage; 142, second through hole; 143, fourth through hole; 144, first partition plate; 145, first limiting member; 15, exhaust valve; 16, second plate member; 161, third passage; 1611, third sub-passage; 162, third through hole; 163, second partition plate; 164, second limiting member; 17, third plate member; 171, fourth passage; 172, fifth through hole; 2, battery cell; 21, pressure relief member; 3, filter assembly; 31, first filter member; 311, sixth through hole; 32, second filter member; 33, third filter member; Z, first direction; X, second direction; Y, third direction. Specific Embodiments

[0063] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present application.

[0064] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality" means two or more, and "at least one" means one, two or more, unless otherwise specifically defined. In the description of the present application, "vertical" means completely vertical at 90° or almost completely vertical. For example, within the range of an included angle of 80° to 100°, it is considered vertical. Similarly, "parallel" means completely parallel or almost completely parallel. For example, within the range of 10° of complete parallelism, it is considered parallel.

[0065] It should also be noted that in the accompanying drawings of the present application, an arrow marked with Z indicates the first direction Z, an arrow marked with X indicates the second direction X, and an arrow marked with Y indicates the third direction Y. The introduction of the first direction Z, the second direction X, and the third direction Y is to facilitate the description of the structural positional relationship of the battery pack, and thus facilitate the understanding of its structure. In the embodiments of the present application, the first direction Z is the arrangement direction of the bottom plate assembly and the battery cells, and is also the height direction of the battery cells. The second direction X is the arrangement direction of the battery cells and the first plate body, and is also the width direction of the battery cells. The third direction Y is the arrangement direction of the two second plate members, and is also the length direction of the battery cells, and the first direction Z, the second direction X, and the third direction Y intersect with each other. Further, the first direction Z, the second direction X, and the third direction Y are perpendicular to each other.

[0066] In the related art, when a battery cell in a battery pack undergoes thermal runaway, in addition to generating high temperature and ejecting impurities such as flames, smoke, dust, and contents, a large amount of gas is also generated. These gases contain toxic and harmful gases such as carbon monoxide, ethylene, and ethane. When a battery cell experiences thermal runaway, the explosion-proof valve opens, and the generated high-pressure gas is discharged through the exhaust valve on the battery pack. Currently, the exhaust valves on the battery pack are generally divided into two types, one is a breather valve, and the other is an explosion-proof valve. Due to the sealing of the battery pack, the main function of the breather valve is to maintain the air pressure balance inside and outside the pack, and the explosion-proof valve is used to ensure that the gases generated after the battery cell undergoes thermal runaway can be discharged outside the pack in a timely manner. However, at present, the above two mainstream valve bodies cannot support the filtration of the gases generated by the thermal runaway of the battery cell, and the above toxic gases will be directly discharged outside the battery pack, and will largely flow into the cockpit and the external air environment, posing a great threat to human safety.

[0067] In view of this, the embodiments of the present application provide a battery pack and an electrical device, aiming to solve the above problems.

[0068] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , the embodiments of the present application provide a battery pack, including a box body 1, battery cells 2, and a filtering component 3. The box body 1 has a receiving cavity 11 and an exhaust passage 12. The exhaust passage 12 is arranged on one side of the receiving cavity 11 and is communicated with the receiving cavity 11; the battery cells 2 are arranged in the receiving cavity 11. The battery cells 2 include a pressure relief member 21, and the pressure relief member 21 is configured to open and relieve pressure into the exhaust passage 12 when the battery cells 2 undergo thermal runaway; the filtering component 3 is arranged in the exhaust passage 12, and the filtering component 3 is configured to filter toxic gases when the pressure relief member 21 opens.

[0069] In the embodiments of the present application, by arranging the exhaust passage 12 in the box body 1, a flow path can be provided for the thermal runaway gases discharged during the thermal runaway of the battery cells 2. The thermal runaway gases can diffuse and reduce pressure in the exhaust passage 12. At the same time, the filtering component 3 is arranged in the exhaust passage 12 to filter the toxic and harmful gases in the thermal runaway gases, reducing the harm caused to the human body and the environment after the thermal runaway gases are discharged from the battery pack, thereby improving safety.

[0070] Specifically, in the present application, a cavity is provided inside the box body 1, and a first through hole 132 is provided for being oppositely arranged with the pressure relief member 21 (specifically, it can be an explosion-proof valve). At this time, the sprayed material corresponding to the opening of the pressure relief member 21 will enter the exhaust passage 12 through the first through hole 132. Among them, the exhaust passage 12 is used to provide a diffusion space for the thermal runaway gas, and at this time, a certain pressure reduction effect can be achieved. If only a very small number of battery cells 2 have thermal runaway and the amount of gas ejected during thermal runaway is small, at this time, the thermal runaway gas can only flow in the exhaust passage 12 of the battery pack, and the exhaust passage 12 is used to play a role in reducing pressure. At this time, the thermal runaway gas can be stored in the exhaust passage 12, reducing the possibility of the thermal runaway gas escaping to the external environment and the compartment, thereby improving safety. In addition, in the embodiment of the present application, a filtering component 3 is provided. During the process of the thermal runaway gas escaping in the exhaust passage 12, the filtering component 3 is used to filter the toxic and harmful gases in the thermal runaway gas, reducing the toxicity in the thermal runaway gas, and further improving safety.

[0071] It should be noted that in the embodiment of the present application, the accommodation cavity 11 can be surrounded by the side plates and the bottom plate of the box body 1. Specifically, the bottom plate assembly 13, the first plate member 14, two second plate members 16 and the third plate member 17 in the following embodiments can be combined to form the accommodation cavity 11. At this time, multiple battery cells 2 are stacked in the accommodation cavity 11. The exhaust passage 12 can be a cavity opened inside at least one of the structures such as the bottom plate assembly 13, the first plate member 14, two second plate members 16 and the third plate member 17 of the box body 1, and the cavity is used to form the exhaust passage 12. At this time, there will be a plate structure separating between the exhaust passage 12 and the accommodation cavity 11, so that the accommodation cavity 11 and the exhaust passage 12 form two independent spaces. Among them, by providing a through hole on the box body 1, the through hole is used to realize the communication between the accommodation cavity 11 and the exhaust passage 12. The pressure relief member 21 of the battery cell 2 needs to face the through hole, and the side wall cover of the battery cell 2 is used to cover the through hole to realize the blockage between the accommodation cavity 11 and the exhaust passage 12.

[0072] It should also be noted that in some embodiments of the present application, the filtering component 3 is impregnated activated carbon impregnated with sodium hydroxide or ammonia water. Activated carbon first has a huge specific surface area and a rich pore structure, and can effectively adsorb components such as carbon monoxide, ethylene, and ethane in the gas generated during the thermal runaway of the battery cell 2. At the same time, the impregnated activated carbon impregnated with sodium hydroxide or ammonia water also has good adsorption and reaction capabilities for acidic harmful gases such as sulfur dioxide that may exist in the thermal runaway gas. At this time, sulfur dioxide and other acidic harmful gases can be fixed in the activated carbon to prevent them from diffusing into the surrounding environment, effectively reducing the risk of the occurrence of secondary hazards of toxic and harmful gases, thereby effectively improving the safety after the battery has thermal runaway.

[0073] Please refer to Figure 2 andFigure 6 In some embodiments, the battery pack has intersecting first direction Z and second direction X. The housing 1 includes a bottom plate assembly 13, a first plate member 14, and an exhaust valve 15. The bottom plate assembly 13 has a first channel 131 and a first through hole 132. The first through hole 132 penetrates the bottom plate assembly 13 along the first direction Z toward the side of the accommodation cavity 11. The first channel 131 communicates with the accommodation cavity 11 through the first through hole 132. The battery cell 2 is connected to the bottom plate assembly 13 and seals the first through hole 132. At least part of the orthographic projection of the pressure relief member 21 on the bottom plate assembly 13 along the first direction Z is located within the first through hole 132. The first plate member 14 is disposed on one side of the accommodation cavity 11 along the second direction X. The first plate member 14 is connected to the bottom plate assembly 13 and is used to enclose the accommodation cavity 11. The first plate member 14 has a second channel 141 and a second through hole 142. The second channel 141 communicates with the first channel 131 and is used to form an exhaust channel 12. At least part of the filtering assembly 3 is disposed within the second channel 141. The second through hole 142 penetrates the side of the first plate member 14 away from the accommodation cavity 11 along the second direction X and communicates with the second channel 141. The exhaust valve 15 is embedded in the second through hole 142 and is sealingly connected to the first plate member 14.

[0074] In the embodiments of the present application, by providing the first channel 131 and the first through hole 132 in the bottom plate assembly 13, and providing the second channel 141 and the second through hole 142 in the first plate body 1351, wherein the first channel 131 and the second channel 141 communicate with each other, and the first through hole 132 is disposed opposite to the pressure relief member 21, when the pressure relief member 21 opens the valve, the thermal runaway gas can enter the first channel 131 through the first through hole 132, so as to realize the flow of the thermal runaway gas in the first channel 131 and the second channel 141, and realize the diversion and diffusion pressure reduction of the thermal runaway gas. Since the thermal runaway gas reaches the second channel 141 and is discharged and relieved through the exhaust valve 15 connected to the second through hole 142 when the pressure exceeds the threshold of the exhaust valve 15, in the embodiments of the present application, by disposing at least part of the filtering assembly 3 in the second channel 141, it is ensured that the gas can only be discharged outside the battery pack after being filtered by the filtering assembly 3. This prevents the leakage of untreated toxic and harmful gases, makes the entire gas discharge and filtering process safer and more reliable, and effectively reduces the harm of toxic and harmful gases to the personnel in the cockpit and the external environment of the vehicle.

[0075] It should be noted that at least a part of the orthographic projection of the pressure relief member 21 on the bottom plate assembly 13 in the first direction Z is located within the first through hole 132. At this time, it is ensured that at least a part of the opening of the pressure relief member 21 is disposed opposite to the first through hole 132 after the pressure relief member 21 is opened. Of course, preferably, the pressure relief member 21 is completely located within the first through hole 132, ensuring that the pressure relief member 21 can accurately discharge the gas into the first channel 131 and then enter the exhaust channel 12 for filtration and discharge. At this time, the side wall of the battery cell 2 can cover and seal the first through hole 132, ensuring that the thermal runaway gas does not enter the accommodation cavity 11.

[0076] It should be noted that the connection manner between the first channel 131 and the second channel 141 will be described in subsequent embodiments of the present application.

[0077] Please refer to Figure 3 、 Figure 4 and Figure 14 In some embodiments, the battery pack has a third direction Y intersecting the first direction Z and the second direction X. The box body 1 includes two second plate members 16 disposed opposite to each other in the third direction Y. The second plate members 16 are respectively connected to the first plate member 14 and the bottom plate assembly 13 for enclosing the accommodation cavity 11. The second plate member 16 has a third channel 161 and a third through hole 162. The third channel 161 communicates with the first channel 131 through the third through hole 162. The third channel 161 penetrates through the side of the second plate member 16 facing the first plate member 14 along the first direction Z. The first plate member 14 has a plurality of fourth through holes 143 spaced apart in the third direction Y. The fourth through holes 143 penetrate through the side of the first plate member 14 facing the accommodation cavity 11 along the second direction X. The second plate member 16 is connected to the first plate member 14 and covers the fourth through holes 143. The third channel 161 communicates with the second channel 141 through the fourth through holes 143. The first channel 131, the second channel 141, and the third channel 161 communicate with each other to form an exhaust channel 12. The filtration assembly 3 includes a first filter member 31 and a second filter member 32. The first filter member 31 is disposed in the second channel 141, and the second filter member 32 is disposed in the third channel 161.

[0078] In the embodiment of the present application, by further providing a third channel 161 and a third through hole 162 in the second plate member 16, at this time, the third through hole 162 is used to communicate with the first channel 131 and the third channel 161, and the third channel 161 is communicated with the second channel 141 through the fourth through hole 143. In this way, a communication path of the exhaust channel 12 is formed, effectively increasing the volume of the exhaust channel 12, so as to achieve a better gas dissipation and pressure reduction effect, further reducing the possibility of the exhaust valve 15 bursting and exhausting after the thermal runaway of the battery cell 2, thereby improving safety. In addition, by providing a second filter member 32 in the third channel 161 and a first filter member 31 in the second channel 141, at this time, there are enough filter members in the flow path of the thermal runaway gas to filter toxic and harmful gases, further improving the gas filtering effect, thereby further improving safety.

[0079] In the embodiment of the present application, when the battery cell 2 is in thermal runaway, the thermal runaway gas enters the corresponding third channel 161 from the third through holes 162 of the second plate members 16 on both sides, and is first filtered by the second filter member 32 in the third channel 161. Due to the certain speed of gas flow, there may be toxic and harmful gases that are not completely filtered flowing from the third channel 161 to the second channel 141. Therefore, the first filter member 31 in the second channel 141 can perform another filtration before the gas is discharged, so as to ensure the effectiveness of filtration.

[0080] Please refer to Figure 6 、 Figure 7 and Figure 8 In some embodiments, the first plate member 14 includes a first partition plate 144, and the first partition plate 144 is disposed in the second channel 141 to divide the second channel 141 into a first sub-channel 1411 and a second sub-channel 1412 arranged along the first direction Z; the second through hole 142 penetrates through the side wall of the first sub-channel 1411 away from the accommodation cavity 11 and communicates with the first sub-channel 1411, and both the first sub-channel 1411 and the second sub-channel 1412 are communicated with the fourth through hole 143; the first filter member 31 is disposed in the first sub-channel 1411.

[0081] In the embodiment of the present application, by providing a first separation plate 135 in the second channel 141 to divide the second channel 141 into a first sub-channel 1411 and a second sub-channel 1412, and the second through hole 142 is communicated with the first sub-channel 1411. At this time, the first filter member 31 is disposed in the first sub-channel 1411. At this time, it can not only effectively filter when the gas is discharged, but also reduce the large-area layout of the first filter member 31 while ensuring the filtering effect. On the one hand, this avoids material waste, and on the other hand, it realizes the weight reduction of the battery pack.

[0082] Please refer to Figure 4 、Figure 14 and Figure 16 In some embodiments, the second plate member 16 includes a plurality of second partition plates 163 which are spaced apart along the first direction Z and are used to divide the third channel 161 into a plurality of third sub-channels 1611 arranged along the first direction Z; the third through hole 162 communicates with the third sub-channel 1611 closest to the bottom plate assembly 13; the filtering assembly 3 includes a plurality of second filtering members 32, and each second filtering member 32 is disposed in one of the third sub-channels 1611.

[0083] In the embodiments of the present application, the third channel 161 is divided into a plurality of third sub-channels 1611 by using a plurality of second partition plates 163, and a second filtering member 32 is disposed in each third sub-channel 1611. At this time, it can ensure the full filtration of the gas by the plurality of third filtering members 33. Since the gas preferentially enters the third channel 161 after being discharged from the first channel 131, a plurality of second filtering members 32 are disposed in the third channel 161, and the thermal runaway gas can be fully filtered.

[0084] Please refer to Figure 4 、 Figure 6 、 Figure 7 and Figure 14 In some embodiments, the first plate member 14 includes a first limiting member 145 which is disposed in the first sub-channel 1411 and is connected to the first partition plate 144, and the first filtering member 31 is disposed along the second direction X between the first limiting member 145 and the side wall of the first sub-channel 1411; the second plate member 16 includes a plurality of second limiting members 164, each second limiting member 164 is disposed in one of the third sub-channels 1611 and is connected to one of the second partition plates 163, and the second filtering member 32 is disposed along the third direction Y between the second limiting member 164 and the side wall of the third sub-channel 1611.

[0085] In the embodiments of the present application, by providing the first limiting member 145 and the second limiting member 164, it can be used to limit and position the filtering member, avoid abnormal noises caused by the movement of activated carbon during the operation of the battery pack, and at the same time ensure the stability of the overall structure of the activated carbon.

[0086] It should be noted that in the embodiments of the present application, the size of the first filtering member 31 along the second direction X is smaller than the size of the first sub-channel 1411 along the second direction X, and the size of the second filtering member 32 along the third direction Y is smaller than the size of the third sub-channel 1611 along the third direction Y. At this time, it can provide space for the rapid flow of the thermal runaway gas through each sub-channel, ensure the flow rate of the gas, and thus achieve the rapid dissipation and fluidity of the gas.

[0087] Please refer to Figure 2 、 Figure 6 andFigure 9 , in some embodiments, the box body 1 further includes a third plate member 17. The third plate member 17 is spaced apart from the first plate member 14 along the second direction X. The third plate member 17 is respectively connected to the two second plate members 16 and the bottom plate assembly 13 to enclose an accommodation cavity 11; the third plate member 17 has a fourth channel 171 and a plurality of fifth through holes 172 spaced apart along the third direction Y. The fifth through holes 172 penetrate through the side of the third plate member 17 facing the second plate member 16 along the second direction X and communicate with the fourth channel 171; the second plate member 16 covers the fifth through holes 172, and the second channel 141 penetrates through the side of the second plate member 16 away from the first plate member 14 along the second direction X, and the second channel 141 communicates with the fifth through holes 172; the first channel 131, the second channel 141, the third channel 161 and the fourth channel 171 communicate with each other to form an exhaust channel 12.

[0088] In the embodiments of the present application, by providing the third plate member 17, the accommodation cavity 11 can be enclosed from four sides. The fourth channel 171 and the fifth through holes 172 are provided in the third plate member 17, and the fifth through holes 172 are used to communicate the fourth channel 171 and the third channel 161. In this way, the volume of the exhaust channel 12 is further enlarged, so as to increase the gas flow path, which is more conducive to the cyclic flow of gas in the exhaust channel 12, thereby achieving a better filtering effect.

[0089] Please refer to Figure 14 and Figure 16 , in some embodiments, along the second direction X, one of the adjacent two second partition plates 163 is connected to the first plate member 14 and is spaced apart from the third plate member 17; the other of the adjacent two second partition plates 163 is connected to the third plate member 17 and is spaced apart from the first plate member 14.

[0090] In the embodiments of the present application, the above structure can achieve the S-shaped connection between the multiple third sub-channels 1611, so that the thermal runaway gas flows sequentially through the multiple third sub-channels 1611. In this way, the multiple second filter elements 32 in the multiple sub-channels can fully filter the thermal runaway gas, improve the gas filtering effect, and further improve the safety.

[0091] As Figure 15 shown, in some embodiments, the first filter element 31 has a sixth through hole 311. The sixth through hole 311 penetrates through the first filter element 31 along the second direction X. The sixth through hole 311 communicates with the second through hole 142, and the aperture of the sixth through hole 311 is larger than the aperture of the second through hole 142.

[0092] In the embodiment of the present application, by providing a sixth through-hole 311 in the first filter member 31, the shielding of the exhaust valve 15 by the first filter member 31 can be reduced, thereby ensuring the exhaust effect. Further, the aperture of the sixth through-hole 311 is larger than that of the second through-hole 142, ensuring that the exhaust valve 15 is completely exposed from the sixth through-hole 311, thus avoiding the shielding of the exhaust valve 15 and further improving the exhaust effect while achieving effective filtration.

[0093] Please refer to Figure 2 , Figure 3 , Figure 5 and Figure 6 , in some embodiments, the bottom plate assembly 13 includes a bottom guard plate 133 and a liquid cooling plate 134. The bottom guard plate 133 is respectively connected to the first plate member 14, the third plate member 17 and the two second plate members 16, and is used to enclose an accommodation cavity 11; the liquid cooling plate 134 has a first through-hole 132, and is respectively connected to the first plate member 14, the third plate member 17 and the two second plate members 16, and encloses a first channel 131 with the bottom guard plate 133; the liquid cooling plate 134 is disposed between the battery cell 2 and the bottom guard plate 133 and is connected to the battery cell 2.

[0094] In the embodiment of the present application, by providing the liquid cooling plate 134, effective cooling of the battery cell 2 can be achieved, reducing the possibility of thermal runaway of the battery cell 2. The first channel 131 is enclosed by the bottom guard plate 133 and the liquid cooling plate 134, and the first through-hole 132 penetrates the liquid cooling plate 134, providing an exhaust space for the thermal runaway of the battery cell 2. The overall structure is concise, realizing the full utilization of each component.

[0095] Please refer to Figure 2 , Figure 3 , Figure 5 and Figure 6 , in some embodiments, the bottom plate assembly 13 further includes a separation plate 135. The separation plate 135 is disposed between the bottom guard plate 133 and the liquid cooling plate 134 and is connected to the liquid cooling plate 134; the separation plate 135 is configured to separate solid substances from gas substances when the pressure relief member 21 sprays.

[0096] In the embodiment of the present application, by providing the separation plate 135, effective separation of the high-temperature molten matter and liquid discharged during the thermal runaway of the battery cell 2 from the thermal runaway gas can be achieved, reducing the possibility of the high-temperature molten matter and the like directly spraying onto the bottom guard plate 133 during thermal runaway, thereby ensuring the safety and reliability of the bottom guard plate 133, and thus improving the overall safety of the battery pack. In addition, it also avoids the contamination of the entire battery pack by the high-temperature molten matter and liquid.

[0097] Please refer to Figure 5 , Figure 10 , Figure 11 , Figure 12 and Figure 13, in some embodiments, the battery pack has a third direction Y intersecting the first direction Z and the second direction X. The separation plate 135 includes a first plate body 1351, a second plate body 1352, and a plurality of first baffles 1353. The first plate body 1351 is connected to the side of the liquid cooling plate 134 away from the battery cell 2. The first plate body 1351 has a seventh through hole 13511, and the seventh through hole 13511 communicates with the first through hole 132. The second plate body 1352 is spaced apart from the first plate body 1351 along the first direction Z. The second plate body 1352 has an eighth through hole 13521, and the eighth through hole 13521 is arranged offset from the seventh through hole 13511 along the first direction Z. The eighth through hole 13521 communicates with the first channel 131. The plurality of first baffles 1353 are spaced apart along the third direction Y. The first baffles 1353 are respectively connected to the first plate body 1351 and the second plate body 1352. The first baffles 1353, the first plate body 1351, and the second plate body 1352 enclose at least one first cavity 1354 and a plurality of second cavities 1355. The at least one first cavity 1354 and the plurality of second cavities 1355 are arranged in a row along the third direction Y. One second cavity 1355 is arranged on each side of each first cavity 1354. The first cavity 1354 communicates with the seventh through hole 13511, and the second cavity 1355 communicates with the eighth through hole 13521. A ninth through hole 13531 is arranged on the side of the first baffle 1353 close to the first plate body 1351. The ninth through hole 13531 penetrates the first baffle 1353 along the third direction Y, and the ninth through hole 13531 communicates with the first cavity 1354 and the second cavity 1355 respectively.

[0098] In the embodiments of the present application, the first plate body 1351, the second plate body 1352, and the plurality of first baffles 1353 can enclose a plurality of first cavities 1354 and second cavities 1355. The first cavities 1354 are used to accommodate high-temperature molten substances and liquids, and the second cavities 1355 are used to transition thermal runaway gases and convey the thermal runaway gases into the first channel 131. In this way, the effective separation of the thermal runaway gases from the high-temperature molten substances and liquids is realized, and the direct diffusion of the high-temperature molten substances and liquids in the first channel 131 is avoided, so as to effectively protect the bottom guard plate 133 from being directly burned out, ensure the structural integrity of the battery pack, and thus reduce the possibility of the thermal runaway gases directly escaping outward without being filtered.

[0099] Among them, the first cavity 1354 is communicated with the first through hole 132 through the seventh through hole 13511. At this time, when the pressure relief member 21 is opened, the thermal runaway gas, high-temperature molten matter, liquid, etc. will all enter the first cavity 1354 through the first through hole 132 and the seventh through hole 13511. By further providing a ninth through hole 13531 on the side of the first baffle 1353 close to the first plate body 1351, the communication between the first cavity 1354 and the second cavity 1355 can be realized. At this time, under the action of gravity, the high-temperature molten matter and liquid will fall on the second plate body 1352. The first baffle 1353 is used to block the high-temperature molten matter and liquid to prevent them from entering the second cavity 1355. Under the action of air pressure, the thermal runaway gas will thus reach the second cavity 1355 from the first cavity 1354 through the ninth through hole 13531 and enter the first channel 131 through the eighth through hole 13521 communicated with the second cavity 1355, thus realizing the separation of gas-liquid and gas-solid.

[0100] Please refer to Figure 5 , Figure 10 , Figure 12 and Figure 13 , in some embodiments, the separation plate 135 further includes a plurality of second baffles 1356 arranged at intervals along the third direction Y. At least two second baffles 1356 are arranged in one of the first cavities 1354. At least two second baffles 1356 are respectively arranged on both sides of the seventh through hole 13511 along the third direction Y. The second baffle 1356 is connected to the first plate body 1351 and is arranged at an interval from the second plate body 1352; the second baffle 1356 is arranged at an interval from the first baffle 1353; the orthographic projection of the second baffle 1356 on the first baffle 1353 along the third direction Y covers the ninth through hole 13531.

[0101] In the embodiment of the present application, at least two second baffles 1356 are arranged in the first chamber 1354. The second baffles 1356 are connected to the first plate body 1351 and are arranged at intervals from the second plate body 1352. The seventh through hole 13511 is located between two adjacent second baffles 1356. At this time, an S-shaped meandering flow channel can be formed. The second baffles 1356 can further block the high-temperature molten material and liquid discharged from the seventh through hole 13511. When there is a large amount of high-temperature molten material, the height of the solid on the side of the second baffle 1356 close to the seventh through hole 13511 can be higher than the height of the ninth through hole 13531. In this way, a better blocking effect can be achieved, and the spraying valve material can be prevented from blocking the ninth through hole 13531. Since the partition plate is relatively long, the spraying valve material of a battery cell 2 may block a local area opposite to the battery cell 2, but the thermal runaway gas can be discharged through other areas of the first chamber 1354. Therefore, the setting of the second baffle 1356 plays a role in preventing the spraying valve material from blocking the ninth through hole 13531 and directly escaping from the ninth through hole 13531 to the second chamber 1355. In addition, the second baffle 1356 can also effectively block the liquid of the spraying valve and prevent the liquid from directly discharging from the ninth through hole 13531.

[0102] Please refer to Figure 2 、 Figure 3 、 Figure 5 and Figure 6 In some embodiments, the filter assembly 3 includes a third filter element 33. The third filter element 33 is arranged between the separation plate 135 and the bottom guard plate 133 and is connected to the bottom guard plate 133.

[0103] In the embodiment of the present application, by arranging the third filter element 33, the thermally runaway gas separated in the first channel 131 can be filtered, and the filtering effect can be further improved. At this time, the setting of the separation plate 135 can also prevent the third filter element 33 from failing due to the direct action of the high-temperature spraying valve material on the third filter element 33.

[0104] Please refer to Figure 2 、 Figure 3 、 Figure 5 and Figure 6, in some embodiments, the filtering component 3 includes a plurality of third filtering members 33. The plurality of third filtering members 33 are arranged in an array and are all connected to the bottom guard plate 133. The bottom plate assembly 13 further includes a plurality of positioning members 136 spaced apart along the first direction Z. Along the first direction Z, one positioning member 136 is arranged between two adjacent third filtering members 33. The positioning member 136 includes a connecting portion 1361 and a positioning portion 1362. The connecting portion 1361 is connected to the side of the positioning portion 1362 facing the bottom guard plate 133, and the side of the connecting portion 1361 away from the positioning portion 1362 is connected to the bottom guard plate 133. Along the first direction Z, the plurality of third filtering members 33 and the plurality of connecting portions 1361 are alternately arranged, and the size of the positioning portion 1362 is larger than that of the connecting portion 1361. Along the second direction X, a part of the third filtering member 33 is arranged between the positioning portion 1362 and the bottom guard plate 133 and is respectively connected to the positioning portion 1362 and the bottom guard plate 133.

[0105] In the embodiments of the present application, by arranging a plurality of third filtering members 33 in an array and cooperating with a plurality of positioning members 136, effective fixation of the plurality of third filtering members 33 can be achieved, avoiding problems such as abnormal noises caused by the movement of the third filtering members 33 in the first channel 131 and fragmentation of the third filtering members 33, which is beneficial to ensuring the overall structural stability.

[0106] Among them, the positioning member 136 includes a connecting portion 1361 and a positioning portion 1362, and the size of the positioning portion 1362 is larger than that of the connecting portion. At this time, the positioning portion 1362 has a T-shaped structure. The connecting portion 1361 is connected to the bottom guard plate 133 and is spaced between two adjacent third filtering members 33. The third filtering members 33 on both sides of the connecting portion 1361 are fixed to the bottom guard plate 133 by the positioning portion 1362. This structure can effectively limit the positions of the third filtering members 33 along the second direction X and the first direction Z, thereby ensuring the structural stability.

[0107] Correspondingly, an electrical device according to an embodiment of the present application includes a battery pack as described in any one of the foregoing embodiments.

[0108] In the embodiments of the present application, the electrical device includes the foregoing battery pack, and the foregoing battery pack is used to supply power to the electrical device. Therefore, the electrical device includes all the technical features and technical effects of the foregoing battery pack.

[0109] Certainly, the electrical devices referred to in this application can be application devices such as vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and electric tools. The vehicle can be a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, an extended-range electric vehicle, etc.; the spacecraft includes airplanes, rockets, space shuttles, and spaceships, etc.; the electric toys include fixed or mobile electric toys, for example, game consoles, electric vehicle toys, electric ship toys, and electric airplane toys, etc.; the electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, for example, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact electric drills, concrete vibrators, and electric planers, etc. The embodiments of this application do not impose special restrictions on the above-mentioned electrical devices.

[0110] In the above embodiments, the descriptions of each embodiment have their own emphases. For parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0111] The above has introduced in detail a battery pack and an electrical device provided by the embodiments of this application, and specific examples have been used to elaborate on the principle and implementation manner of this application. The description of the above embodiments is only used to help understand the technical solution and its core idea of this application; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery pack, characterized in that: include: A box body, comprising a containing cavity and an exhaust passage, wherein the exhaust passage is arranged at one side of the containing cavity and communicates with the containing cavity; A battery cell is disposed in the accommodating cavity, wherein the battery cell comprises a pressure relief member, and the pressure relief member is configured to open and release pressure into the exhaust passage when the battery cell is in thermal runaway; A filter assembly is disposed in the exhaust passage, and the filter assembly is configured to filter toxic gases when the pressure relief member is opened.

2. The battery pack according to claim 1, characterized in that: The battery pack has a first direction and a second direction intersecting each other, and the box body comprises: A bottom plate assembly having a first channel and a first through hole, wherein the first through hole penetrates the side of the bottom plate assembly facing the accommodating cavity along the first direction, and the first channel is connected to the accommodating cavity through the first through hole; the battery cell is connected to the bottom plate assembly and covers the first through hole, and at least a part of the orthographic projection of the pressure relief member on the bottom plate assembly along the first direction is located in the first through hole; A first plate is disposed on one side of the accommodating cavity along the second direction; the first plate is connected to the bottom plate assembly to enclose the accommodating cavity; the first plate has a second channel and a second through hole, the second channel is communicated with the first channel to form the exhaust channel, at least part of the filter assembly is disposed in the second channel; the second through hole passes through a side of the first plate away from the accommodating cavity along the second direction and is communicated with the second channel; An exhaust valve is embedded in the second through hole and is sealed and connected to the first plate.

3. The battery pack according to claim 2, characterized in that: The battery pack has a third direction intersecting the first direction and the second direction, the box body includes two second plates arranged opposite to each other along the third direction, the second plates are respectively connected to the first plate and the bottom plate assembly to enclose the accommodating cavity; the second plate has a third channel and a third through hole, the third channel is connected to the first channel through the third through hole, and the third channel passes through the second plate along the first direction and faces one side of the first plate; The first plate has a plurality of fourth through holes spaced apart along the third direction, the fourth through holes passing through a side of the first plate facing the accommodating cavity along the second direction, the second plate is connected to the first plate and covers the fourth through holes; the third channel is connected to the second channel through the fourth through holes; the first channel, the second channel and the third channel are connected to form the exhaust channel; The filter assembly includes a first filter element and a second filter element. The first filter element is disposed in the second channel, and the second filter element is disposed in the third channel.

4. The battery pack according to claim 3, characterized in that: The first plate member includes a first partition plate, which is arranged in the second channel to divide the second channel into a first sub-channel and a second sub-channel arranged along the first direction; the second through hole penetrates the side wall of the first sub-channel away from the accommodating cavity and is remotely connected to the first sub-channel, and the first sub-channel and the second sub-channel are both connected to the fourth through hole; the first filter element is arranged in the first sub-channel.

5. The battery pack according to claim 4, characterized in that: The second plate member includes a plurality of second partition plates, which are arranged at intervals along the first direction to divide the third channel into a plurality of third sub-channels arranged along the first direction; the third through hole is connected to the third sub-channel closest to the bottom plate assembly; The filter assembly includes a plurality of the second filter elements, and each of the second filter elements is disposed in one of the third sub-channels.

6. The battery pack according to claim 5, characterized in that: The first plate member includes a first stopper, the first stopper is disposed in the first sub-channel and connected to the first partition plate, and the first filter member is disposed between the first stopper and a side wall of the first sub-channel along the second direction; The second plate member includes a plurality of second limit members, each of which is disposed in one of the third sub-channels and connected to one of the second partition plates, and the second filter member is disposed between the second limit member and the side wall of the third sub-channel along the third direction.

7. The battery pack according to claim 5, characterized in that: The box body further includes a third plate, the third plate is spaced apart from the first plate along the second direction, the third plate is respectively connected to the two second plates and the bottom plate assembly to enclose the accommodating cavity; the third plate has a fourth channel and a plurality of fifth through holes spaced apart along the third direction, the fifth through holes penetrate the side of the third plate toward the second plate along the second direction, and are communicated with the fourth channel; The second plate covers the fifth through hole, the second channel passes through the side of the second plate away from the first plate along the second direction, and the second channel is connected to the fifth through hole; the first channel, the second channel, the third channel and the fourth channel are connected to form the exhaust channel.

8. The battery pack according to claim 7, characterized in that: Along the second direction, one of two adjacent second partition plates is connected to the first plate and spaced apart from the third plate; the other of two adjacent second partition plates is connected to the third plate and spaced apart from the first plate.

9. The battery pack according to claim 4, characterized in that: The first filter element has a sixth through hole, the sixth through hole penetrates the first filter element along the second direction, the sixth through hole is communicated with the second through hole, and the aperture of the sixth through hole is larger than the aperture of the second through hole.

10. The battery pack according to claim 2, characterized in that: The base plate assembly comprises: A bottom guard plate, connected to the first plate, the third plate and the two second plates respectively, for enclosing the accommodating cavity; The liquid cooling plate has the first through hole and is respectively connected to the first plate, the third plate and the two second plates, and forms the first channel with the bottom guard plate; the liquid cooling plate is arranged between the battery cell and the bottom guard plate, and is connected to the battery cell.

11. The battery pack according to claim 10, characterized in that: The bottom plate assembly also includes a separation plate, which is disposed between the bottom guard plate and the liquid cooling plate and connected to the liquid cooling plate; the separation plate is configured to separate solid matter from gaseous matter when the pressure relief member sprays a valve.

12. The battery pack according to claim 11, characterized in that: The battery pack has a third direction intersecting the first direction and the second direction, and the separator includes: A first plate body connected to a side of the liquid cooling plate away from the battery cell, the first plate body having a seventh through hole, the seventh through hole being connected to the first through hole; a second plate body, arranged with a spacing from the first plate body along the first direction; the second plate body having an eighth through hole, the eighth through hole being arranged in a staggered manner with the seventh through hole along the first direction, and the eighth through hole being communicated with the first channel; A plurality of first baffles are arranged at intervals along the third direction; the first baffles are respectively connected to the first plate body and the second plate body, the first baffles, the first plate body and the second plate body enclose at least one first cavity and a plurality of second cavities, at least one first cavity and a plurality of second cavities are arranged along the third direction, and a second cavity is respectively arranged on both sides of each first cavity; the first cavity is connected to the seventh through hole, and the second cavity is connected to the eighth through hole; a ninth through hole is arranged on the side of the first baffle close to the first plate body, the ninth through hole penetrates the first baffle along the third direction, and the ninth through hole is respectively connected to the first cavity and the second cavity.

13. The battery pack according to claim 12, characterized in that: The separation plate also includes a plurality of second baffles spaced apart along the third direction, at least two of the second baffles are disposed in one of the first cavities, at least two of the second baffles are respectively disposed on both sides of the seventh through hole along the third direction, the second baffle is connected to the first plate body and spaced apart from the second plate body; the second baffle is spaced apart from the first baffle; the orthographic projection of the second baffle on the first baffle along the third direction covers the ninth through hole.

14. The battery pack according to claim 11, characterized in that: The filter assembly includes a third filter element, which is disposed between the separation plate and the bottom guard plate and connected to the bottom guard plate.

15. The battery pack according to claim 14, characterized in that: The filter assembly includes a plurality of the third filter elements, which are arranged in an array and are all connected to the bottom guard plate; The bottom plate assembly also includes a plurality of positioning members arranged at intervals along the first direction, and a positioning member is arranged between two adjacent third filter elements along the first direction; the positioning member includes a connecting portion and a positioning portion, the connecting portion is connected to a side of the positioning portion facing the bottom guard plate, and a side of the connecting portion away from the positioning portion is connected to the bottom guard plate; along the first direction, a plurality of the third filter elements and a plurality of the connecting portions are alternately arranged, and the size of the positioning portion is larger than the size of the connecting portion; along the second direction, a portion of the third filter element is arranged between the positioning portion and the bottom guard plate, and is respectively connected to the positioning portion and the bottom guard plate.

16. The battery pack according to claim 1, characterized in that: The filter component is impregnated activated carbon impregnated with sodium hydroxide or ammonia water.

17. An electrical device, characterized in that: Comprising a battery pack as described in any one of claims 1-16.

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