Box body structure, battery pack and electric equipment

Abstract

The utility model discloses a box body structure, a battery pack and electric equipment. The box structure comprises a plurality of edge beams and at least one anti-explosion valve. An accommodating cavity is formed among the plurality of edge beams, the accommodating cavity is used for accommodating a plurality of batteries, and an exhaust channel is formed in at least one edge beam. The at least one anti-explosion valve is arranged at the end of the at least one edge beam, and the exhaust channel is communicated with the containing cavity and the anti-explosion valve. Therefore, the space utilization rate of the battery pack can be effectively improved, an exhaust scheme is realized on the basis of not changing the overall structure of the battery pack, and the production cost is reduced. When the battery in the accommodating cavity is subjected to thermal runaway, high-temperature gas can be timely exhausted from the explosion-proof valve through the exhaust channel, so that gas heat and electricity are effectively isolated, the safety and the stability of the battery pack are improved, and the risk of arcing and firing of the battery pack is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a box structure, a battery pack, and an electrical device. Background Art

[0002] Safety has always been the core concern in the structural design of battery packs. By continuously improving and optimizing the battery pack structure, the risks brought about by thermal runaway of the battery can be reduced. In the current battery pack structure, no dedicated exhaust channel is provided. As a result, when the battery undergoes thermal runaway, it is impossible to achieve gas-electric isolation, greatly increasing the risk of arc ignition of the battery pack. Summary of the Utility Model

[0003] Embodiments of the present application provide a box structure, a battery pack, and an electrical device to solve at least one of the above-mentioned technical problems.

[0004] The box structure of the embodiment of the present application includes:

[0005] A plurality of side beams, an accommodation cavity is formed between the plurality of side beams, the accommodation cavity is used to accommodate a plurality of batteries, and an exhaust channel is formed inside at least one side beam; and

[0006] At least one explosion-proof valve, the at least one explosion-proof valve is arranged at the end of the at least one side beam, and the exhaust channel communicates the accommodation cavity with the explosion-proof valve.

[0007] In some embodiments, the at least one side beam includes a first side beam and a second side beam, the first side beam and the second side beam are arranged opposite to each other, the plurality of batteries are located between the first side beam and the second side beam, a first exhaust channel is formed inside the first side beam, and a second exhaust channel is formed inside the second side beam;

[0008] The at least one explosion-proof valve includes a first explosion-proof valve and a second explosion-proof valve, the first explosion-proof valve is arranged at the end of the first side beam, the second explosion-proof valve is arranged at the end of the second side beam, the first exhaust channel communicates the accommodation cavity with the first explosion-proof valve, and the second exhaust channel communicates the accommodation cavity with the second explosion-proof valve.

[0009] In some embodiments, the length extension direction of the first side beam and the second side beam is a first direction, the length extension direction of the plurality of batteries is a second direction, and the first direction is perpendicular to the second direction.

[0010] In some embodiments, the box structure further includes a plurality of airflow generating members, the plurality of airflow generating members are arranged at intervals in the exhaust channel and are used to guide the airflow to the explosion-proof valve.

[0011] In some embodiments, the multiple batteries are divided into multiple groups, and each group of the batteries is electrically connected to a corresponding one of the airflow generating members in the exhaust passage.

[0012] In some embodiments, in the exhaust passage, the multiple airflow generating members work in parallel.

[0013] In some embodiments, the box structure further includes a battery management system, and the battery management system is configured to control the multiple airflow generating members to work when thermal runaway occurs in the multiple batteries.

[0014] In some embodiments, a plurality of air inlets are provided on one side of the at least one side beam close to the multiple batteries, the multiple air inlets are spaced apart in the exhaust passage, and the multiple air inlets are configured to communicate the accommodation cavity with the exhaust passage.

[0015] The battery pack according to the embodiment of the present application includes:

[0016] The box structure according to any one of the above embodiments; and

[0017] Multiple batteries, the multiple batteries are disposed in the box structure.

[0018] The electrical equipment according to the embodiment of the present application includes the above battery pack.

[0019] In the box structure, the battery pack and the electrical equipment according to the embodiment of the present application, an exhaust passage is formed inside at least one side beam, and the exhaust passage communicates the accommodation cavity with the explosion-proof valve. In this way, the space utilization rate of the battery pack can be effectively improved, the exhaust scheme can be realized without changing the overall structure of the battery pack, and the production cost can be reduced. When thermal runaway occurs in the batteries in the accommodation cavity, the high-temperature gas can be discharged in time through the explosion-proof valve through the exhaust passage, effectively isolating the gas heat from the electricity, improving the safety and stability of the battery pack, and reducing the risk of arcing and ignition of the battery pack.

[0020] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the drawings required for the description of the embodiments or related technologies. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts. Among them:

[0022] Figure 1It is a schematic diagram of the overall structure of a battery pack according to some embodiments of the present application;

[0023] Figure 2 It is a schematic cross-sectional structure diagram of a battery pack according to some embodiments of the present application;

[0024] Figure 3 It is a schematic diagram of a partial structure of a battery pack according to some embodiments of the present application;

[0025] Figure 4 It is a schematic diagram of a partial exploded structure of a battery pack according to some embodiments of the present application;

[0026] Figure 5 It is a schematic plan view of a battery pack according to some embodiments of the present application;

[0027] Figure 6 It is a schematic cross-sectional structure diagram of a battery pack according to some embodiments of the present application;

[0028] Figure 7 It is a schematic diagram of a module of an electrical device according to some embodiments of the present application.

[0029] Explanation of reference numerals:

[0030] Cabinet structure 100, side beam 10, first side beam 11, second side beam 12, explosion-proof valve 20, first explosion-proof valve 21, second explosion-proof valve 22, exhaust passage 30, first exhaust passage 31, second exhaust passage 32, air flow generating member 40, accommodation cavity 50, battery pack 200, battery 210, electrical device 300. Detailed implementation manners

[0031] The following details the implementation manners of the present application. The examples of the implementation manners are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The implementation manners described below with reference to the drawings are exemplary only for explaining the present application and should not be construed as limiting the present application.

[0032] Please refer to Figures 1 to 3 , the implementation manner of the present application provides a cabinet structure 100. The cabinet structure 100 includes a plurality of side beams 10 and at least one explosion-proof valve 20. An accommodation cavity 50 is formed between the plurality of side beams 10, and the accommodation cavity 50 is used to accommodate a plurality of batteries 210. An exhaust passage 30 is formed inside at least one side beam 10. At least one explosion-proof valve 20 is provided at the end of at least one side beam 10, and the exhaust passage 30 communicates the accommodation cavity 50 with the explosion-proof valve 20.

[0033] In the box structure 100 according to the embodiment of the present application, an exhaust passage 30 is formed inside at least one side beam 20, and the exhaust passage 30 communicates the accommodation cavity 50 with the explosion-proof valve 20. In this way, the space utilization rate of the battery pack 200 can be effectively improved, and the exhaust solution can be realized without changing the overall structure of the battery pack 200, reducing the production cost. When the battery 210 in the accommodation cavity 50 undergoes thermal runaway, the high-temperature gas can be discharged from the explosion-proof valve 20 in time through the exhaust passage 30, effectively isolating the gas heat from the electricity, improving the safety and stability performance of the battery pack 200, and reducing the risk of arcing and ignition of the battery pack 200.

[0034] Specifically, the box structure 100 can be used as the housing of the battery pack 200 to protect the battery 210 inside the battery pack 200. The box structure 100 includes a plurality of side beams 10 and at least one explosion-proof valve 20.

[0035] The plurality of side beams 10 form the main frame of the box structure 100, and an accommodation cavity 50 is formed between the plurality of side beams 10. The accommodation cavity 50 can be used to install a plurality of batteries 210. An exhaust passage 30 is formed inside at least one side beam 10. For example, the side beam 10 can adopt a hollow columnar structure to form the exhaust passage 30. The gas flow direction of the exhaust passage 30 is the length direction of the side beam 10. In the embodiment of the present application, the side beam 10 and the exhaust passage 30 are integrally designed, and the side beam 10 and the exhaust passage 30 can be integrally formed by profile extrusion technology, with a relatively simple structural process and improved space utilization rate of the battery pack 200. Among them, the plurality of side beams 10 can be part of the bottom tray of the battery pack 200 to reduce materials and assembly difficulty.

[0036] At least one explosion-proof valve 20 is arranged at the end of at least one side beam 10, and the exhaust passage 30 communicates the accommodation cavity 50 with the explosion-proof valve 20. That is to say, the number of explosion-proof valves 20 is the same as the number of side beams 10 with an exhaust passage 30 formed inside. When an exhaust passage 30 is formed inside one side beam 10, one explosion-proof valve 20 is arranged at the end of this one side beam 10; when exhaust passages 30 are formed inside two side beams 10, two explosion-proof valves 20 are respectively arranged at the ends of these two side beams 10, and so on. Each exhaust passage 30 communicates the accommodation cavity 50 with the corresponding explosion-proof valve 20 to discharge the gas and other substances generated by the battery 210 in the accommodation cavity 50 out of the battery pack 200 through each exhaust passage 30 and via the corresponding explosion-proof valve 20.

[0037] In the related art, when a certain battery in the battery pack undergoes thermal runaway, the high-temperature gas discharged from the explosion-proof valve of the battery itself will converge to the side beam through the cross beam, and then be discharged out of the battery pack through the explosion-proof valve of the battery pack. The gas converging from the cross beam to the side beam increases the path for the gas to be discharged out of the battery pack, and also increases the risk of the battery pack catching fire during thermal runaway.

[0038] In the embodiment of the present application, when the battery 210 in the accommodation cavity 50 undergoes thermal runaway, the high-temperature gas can be discharged in time through the exhaust passage 30 by the explosion-proof valve 20. The gas only flows through the exhaust passage 30 inside the side beam 10, and the flow path is short, reducing the residence time of the gas in the battery pack 200, thereby reducing the risk of the battery pack 200 catching fire.

[0039] In the related art, the exhaust passage of the battery pack is usually arranged at the bottom of the battery pack, which will increase the longitudinal height of the battery pack and affect the interior space of the whole vehicle or the ground clearance of the battery pack.

[0040] In the embodiment of the present application, the exhaust passage 30 is formed inside at least one side beam 20, and the exhaust solution can be realized without changing the overall structure of the battery pack 200, without increasing the longitudinal height of the battery pack 200, and effectively improving the space utilization rate of the battery pack 200.

[0041] Please refer to Figure 4 , in some embodiments, at least one side beam 10 includes a first side beam 11 and a second side beam 12. The first side beam 11 and the second side beam 12 are arranged opposite to each other, and a plurality of batteries 210 are located between the first side beam 11 and the second side beam 12. A first exhaust passage 31 is formed inside the first side beam 11, and a second exhaust passage 32 is formed inside the second side beam 12. At least one explosion-proof valve 20 includes a first explosion-proof valve 21 and a second explosion-proof valve 22. The first explosion-proof valve 21 is arranged at the end of the first side beam 11, and the second explosion-proof valve 22 is arranged at the end of the second side beam 12. The first exhaust passage 31 communicates with the accommodation cavity 50 and the first explosion-proof valve 21, and the second exhaust passage 32 communicates with the accommodation cavity 50 and the second explosion-proof valve 22.

[0042] Specifically, the first side beam 11 and the second side beam 12 can be arranged parallel and opposite to each other, and the space between them forms an accommodation cavity 50 for accommodating a plurality of batteries 210. The first explosion-proof valve 21 can coincide with the central axis of the first side beam 11, and the second explosion-proof valve 22 can coincide with the central axis of the second side beam 12.

[0043] In the embodiment of the present application, when the battery 210 in the accommodation cavity 50 undergoes thermal runaway, the high-temperature gas can be discharged in time through the exhaust passages 30 on both sides of the plurality of batteries 210 by the explosion-proof valve 20. As Figure 3 and Figure 4 shown, the high-temperature gas near the left side of the plurality of batteries 210 is discharged through the first exhaust passage 31 via the first explosion-proof valve 21, and the high-temperature gas near the right side of the plurality of batteries 210 is discharged through the second exhaust passage 32 via the second explosion-proof valve 22. In this way, the efficiency of discharging the high-temperature gas from the battery pack 200 can be increased, and the risk of the battery pack 200 arcing and catching fire can be further reduced.

[0044] Please refer to Figure 5 and Figure 6 , in some embodiments, the length extension directions of the first side beam 11 and the second side beam 12 are the first direction, and the length extension direction of the plurality of batteries 210 is the second direction. The first direction is perpendicular to the second direction.

[0045] Specifically, the first direction is, for example, the Y direction as shown in Figure 6 , and the second direction is, for example, the X direction as shown in Figure 6 . The first direction is perpendicular to the second direction. The plurality of batteries 210 can be arranged in sequence along the first direction. Then, both ends of the plurality of batteries 210 in the length direction respectively correspond to different positions in the length direction of the first side beam 11 and the second side beam 12, that is, they respectively correspond to different positions in the length direction of the first exhaust passage 31 and the second exhaust passage 32. When a thermal runaway occurs in the battery 210 in the accommodation cavity 50, the high-temperature gas can sequentially pass through the first exhaust passage 31 and be discharged out of the battery pack 200 through the first explosion-proof valve 21 at different positions in the length direction of the first exhaust passage 31 and the second exhaust passage 32, or be discharged out of the battery pack 200 through the second exhaust passage 32 and the second explosion-proof valve 22.

[0046] Please refer to Figure 2 , Figure 4 and Figure 6 , in some embodiments, the box body structure 100 further includes a plurality of air flow generating members 40. The plurality of air flow generating members 40 are arranged at intervals in the exhaust passage 30 and are used to guide the air flow to the explosion-proof valve 20.

[0047] Specifically, the air flow generating member 40 can be an exhaust fan. The exhaust fan generates wind power through the rotating blades to achieve air flow guidance. The plurality of air flow generating members 40 can be fixed in the exhaust passage 30 by screws, for example, fixed at the top inside the exhaust passage 30. In this way, the fixing method is simple, easy to operate, and has high connection stability.

[0048] The plurality of air flow generating members 40 are arranged at intervals in the exhaust passage 30. Among them, the distance between any two air flow generating members 40 can be equal. The plurality of air flow generating members 40 are all used to guide the air flow to the explosion-proof valve 20. For example, when the explosion-proof valve 20 is arranged at one end of the side beam 10 in the length direction, the air flow generating member 40 can be used to guide the air flow from the other end of the side beam 10 in the length direction to the one end of the side beam 10 in the length direction, so that the high-temperature gas in the exhaust passage 30 can flow towards the position of the explosion-proof valve 20, and thus be discharged out of the battery pack 200 through the explosion-proof valve 20.

[0049] When the exhaust passage 30 includes a first exhaust passage 31 and a second exhaust passage 32, a plurality of air flow generating members 40 can be disposed in the first exhaust passage 31 and the second exhaust passage 32 simultaneously and are used to guide the air flow to the corresponding first explosion-proof valve 21 and second explosion-proof valve 22. Among them, the plurality of air flow generating members 40 can be symmetrically distributed in the first exhaust passage 31 and the second exhaust passage 32 on both sides.

[0050] In the embodiment of the present application, by providing a plurality of air flow generating members 40, the gas flow in the exhaust passage 30 can be accelerated. Among them, the plurality of air flow generating members 40 are arranged at intervals, and multi-stage acceleration can be realized. The thermal runaway gas can be discharged out of the battery pack 200 faster, greatly reducing the fire risk of the battery pack 200.

[0051] Please refer to Figure 6 , in some embodiments, the plurality of batteries 210 are divided into multiple groups, and each group of batteries 210 is electrically connected to a corresponding air flow generating member 40 in the exhaust passage 30.

[0052] Specifically, taking 30 batteries 210 as an example, the 30 batteries 210 can be divided into 3 groups, with each group including 10 batteries. One air flow generating member 40 is arranged at the corresponding position of every 10 batteries 210 in the exhaust passage 30. The 10 batteries 210 in each group are electrically connected to a neighboring air flow generating member 40 to serve as the power source of the neighboring air flow generating member 40. In this way, when the battery 210 undergoes thermal runaway, the energy of the battery 210 can be consumed, which can not only reduce the heat generated by the out-of-control battery 210, but also improve the thermal stability of the non-out-of-control batteries 210, thereby improving the safety of the non-out-of-control batteries 210.

[0053] In the related design, the problem of the energy release of the battery pack when the battery undergoes thermal runaway is not considered, and the energy of the battery pack can only be released through thermal runaway, which is more harmful.

[0054] In the embodiment of the present application, when the battery 210 undergoes thermal runaway, with the operation of the air flow generating member 40, the energy of the battery 210 supplying power to it is continuously consumed. When the battery 210 undergoes thermal runaway, the released heat energy will decrease, and the harm will be weakened; at the same time, with the release of energy, the thermal stability of the adjacent batteries 210 will also be improved, and the difficulty of thermal propagation of the battery 210 will increase, enhancing the safety of the entire battery pack 200.

[0055] Please refer to Figure 6 , in some embodiments, in the exhaust passage 30, the plurality of air flow generating members 40 work in parallel.

[0056] Specifically, multiple air flow generating components 40 in the exhaust passage 30 operate in parallel. When a certain air flow generating component 40 fails, it will not affect the normal operation of other air flow generating components 40. Thus, when the battery 210 undergoes thermal runaway, other air flow generating components 40 can operate normally to discharge the gas outside the battery pack 200.

[0057] Please refer to Figure 6 , in some embodiments, the box structure 100 further includes a battery management system. The battery management system is used to control the operation of multiple air flow generating components 40 when multiple batteries 210 undergo thermal runaway.

[0058] Specifically, the battery management system can monitor parameters such as the voltage, current, temperature, air pressure, state of charge, and state of health of the battery 210 in real time to ensure that the battery 210 operates within a safe range. When the battery management system determines that the battery 210 has undergone thermal runaway based on abnormal parameters, it can control multiple air flow generating components 40 to start operating through a line switch to discharge the thermal runaway gas outside the battery pack 200 and reduce the risk of arcing and fire in the battery pack 200.

[0059] Please refer to Figure 6 , in some embodiments, multiple air inlets are provided on one side of at least one side beam 10 close to multiple batteries 210. The multiple air inlets are spaced apart in the exhaust passage 30, and the multiple air inlets are used to communicate the accommodation cavity 50 with the exhaust passage 30.

[0060] Specifically, for the side beam 10 with an exhaust passage 30 formed inside, multiple air inlets are provided on one side close to multiple batteries 210. The air inlets can be arranged in the shape of small holes, and the multiple air inlets can be equally spaced in the exhaust passage 30 so that the thermal runaway gas in the accommodation cavity 50 can enter the exhaust passage 30 nearby through the multiple air inlets at different positions of the exhaust passage 30, and then be discharged outside the battery pack 200 through the exhaust passage 30 and the explosion-proof valve 20.

[0061] In the related art, the design of the exhaust passage of the battery pack is divided into two routes: First, each battery in the battery pack is provided with a dedicated exhaust port, and the gas enters the exhaust passage through the exhaust port and then is discharged outside the battery pack. Such a design results in a significant increase in the overall cost and assembly difficulty of the battery pack. Second, each battery pack shares one exhaust port, and the rest diffuse freely inside the battery pack. The gas inside the battery pack is discharged to the outside of the battery pack through the exhaust port. This design only considers the mutual influence of the gas between the battery packs, while ignoring the influence of high-temperature gas, electrolyte, and solid particles inside the battery pack.

[0062] In the embodiment of the present application, it is not necessary to provide a corresponding air inlet for each battery 210. Instead, one air inlet can correspond to multiple batteries 210. For example, one air inlet corresponds to every 10 batteries 210. Therefore, it will not cause a significant increase in the overall cost and assembly difficulty of the battery pack 200. In addition, it is not that the entire battery pack 200 shares one air inlet. Instead, considering the influence of high-temperature gas, electrolyte, and solid particles inside the battery pack 200, air inlets are provided for multiple batteries 210 inside the battery pack 200.

[0063] Please refer to Figure 6 , and the working process of the box structure 100 in the embodiment of the present application when the battery 210 undergoes thermal runaway will be described below.

[0064] When the battery 210 undergoes thermal runaway, the battery 210 discharges a large amount of high-temperature gas, electrolyte vapor, and electrolyte liquid through the explosion-proof valve of the battery 210 itself. Under the action of pressure, the gas will enter the accommodation chamber 50, resulting in an increase in the internal pressure. At this time, the explosion-proof valve 20 of the box structure 100 opens under the action of pressure. At the same time, the battery management system controls the air flow generating member 40 to start working, and a negative pressure is formed inside the exhaust passage 30. Under the pressure difference between the accommodation chamber 50 and the exhaust passage 30, a large amount of thermal runaway gas accelerates into the exhaust passage 30 through the air inlet of the side beam 10, reducing the air pressure inside the accommodation chamber 50. At this time, due to the rapid decrease in pressure, the liquid electrolyte discharged from the battery 210 can continue to accelerate and volatilize into the exhaust passage 30. The gas and other substances in the exhaust passage 30 are then discharged outside the battery pack 200 through the explosion-proof valve 20.

[0065] In the related art, the designs for discharging the runaway gas outside the battery pack are all passive safety designs, which cannot actively manage the discharged substances. The discharged substances are in a runaway state inside the battery pack and are likely to flow back into the battery pack, causing secondary hazards.

[0066] In the embodiment of the present application, by using the pressure difference between the accommodation chamber 50 and the exhaust passage 30, the gas and other substances can be actively discharged quickly, realizing the isolation of gas heat and electricity and reducing the fire risk of the battery pack 200.

[0067] Please refer to Figures 1 to 3 , and the embodiment of the present application also provides a battery pack 200. The battery pack 200 includes the box structure 100 in any of the above embodiments and multiple batteries 210. The multiple batteries 210 are arranged in the box structure 100.

[0068] Specifically, the battery 210 can be a secondary battery, such as a lithium-ion battery. The gas generated when the battery 210 gets out of control can be discharged from the explosion-proof valve of the battery 210 itself into the accommodation chamber 50, and then enter the exhaust passage 30 through the air inlet of the side beam 10. Among them, the explosion-proof valve of the battery 210 itself does not need to be deliberately aligned and closely attached to the air inlet of the side beam 10, and can enter the exhaust passage 30 through the air inlet under the action of negative pressure, greatly reducing the assembly difficulty.

[0069] Please refer to Figure 7 , this embodiment of the present application also provides an electrical device 300. The electrical device 300 includes the battery pack 200 of any of the above embodiments. The electrical device 300 can be a smart phone, a tablet computer, a laptop computer, an electric vehicle, an electric bicycle, an industrial device (such as a machine tool) or a household device (such as an air conditioner, a TV, etc.).

[0070] In the box structure 100, the battery pack 200 and the electrical device 300 of this embodiment of the present application, an exhaust passage 30 is formed inside at least one side beam 10, and the exhaust passage 30 communicates the accommodation chamber 50 with the explosion-proof valve 20. In this way, the space utilization rate of the battery pack 200 can be effectively improved, the exhaust scheme can be realized without changing the overall structure of the battery pack 200, and the production cost can be reduced. When the battery 210 in the accommodation chamber 50 undergoes thermal runaway, the high-temperature gas can be discharged in time through the exhaust passage 30 by the explosion-proof valve 20, effectively isolating the gas heat from the electricity, improving the safety and stability performance of the battery pack 200, and reducing the risk of arc ignition of the battery pack 200.

[0071] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the 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 understood 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 unless otherwise specifically defined.

[0072] In the description of the present application, it should be noted that, unless otherwise clearly defined and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0073] In the present application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0074] The above disclosure provides many different embodiments or examples for implementing different structures of the present application. To simplify the disclosure of the present application, the components and settings of specific examples are described above. Of course, they are only examples and are not intended to limit the present application. In addition, the present application may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0075] In the description of this specification, the descriptions referring to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "instances", "specific examples", "some examples", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0076] Although the embodiments of the present application have been shown and described above, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present application. The scope of the present application is defined by the claims and their equivalents.

Claims

1. A box structure (100), characterized in that, Comprising: A plurality of side beams (10), an accommodation cavity (50) is formed between the plurality of side beams (10), the accommodation cavity (50) is used to accommodate a plurality of batteries (210), and an exhaust passage (30) is formed inside at least one side beam (10); and At least one explosion-proof valve (20), the at least one explosion-proof valve (20) is arranged at the end of the at least one side beam (10), and the exhaust passage (30) communicates the accommodation cavity (50) with the explosion-proof valve (20).

2. The box structure (100) according to claim 1, wherein, The at least one side beam (10) includes a first side beam (11) and a second side beam (12), the first side beam (11) and the second side beam (12) are arranged opposite to each other, the plurality of batteries (210) are located between the first side beam (11) and the second side beam (12), a first exhaust passage (31) is formed inside the first side beam (11), and a second exhaust passage (32) is formed inside the second side beam (12); The at least one explosion-proof valve (20) includes a first explosion-proof valve (21) and a second explosion-proof valve (22), the first explosion-proof valve (21) is arranged at the end of the first side beam (11), the second explosion-proof valve (22) is arranged at the end of the second side beam (12), the first exhaust passage (31) communicates the accommodation cavity (50) with the first explosion-proof valve (21), and the second exhaust passage (32) communicates the accommodation cavity (50) with the second explosion-proof valve (22).

3. The box structure (100) according to claim 2, characterized in that, The length extension directions of the first side beam (11) and the second side beam (12) are the first direction, the length extension direction of the plurality of batteries (210) is the second direction, and the first direction is perpendicular to the second direction.

4. The box structure (100) according to claim 1, wherein The box body structure (100) further includes a plurality of air flow generating members (40), the plurality of air flow generating members (40) are arranged at intervals in the exhaust passage (30) and are used to guide air flow to the explosion-proof valve (20).

5. The box structure (100) according to claim 4, characterized in that, The plurality of batteries (210) are divided into multiple groups, and each group of the batteries (210) is electrically connected to a corresponding one of the air flow generating members (40) in the exhaust passage (30).

6. The box structure (100) according to claim 4, characterized in that, In the exhaust passage (30), the plurality of air flow generating members (40) work in parallel.

7. The box structure (100) according to claim 4, characterized in that, The box body structure (100) further includes a battery management system, and the battery management system is used to control the plurality of air flow generating members (40) to work when thermal runaway occurs in the plurality of batteries (210).

8. The box structure (100) according to claim 1, characterized in that, A plurality of air inlets are provided on one side of the at least one side beam (10) close to the plurality of batteries (210), the plurality of air inlets are distributed at intervals in the exhaust passage (30), and the plurality of air inlets are used to communicate the accommodation cavity (50) with the exhaust passage (30).

9. A battery pack (200), characterized in that, Comprising: The box body structure (100) according to any one of claims 1-8; And A plurality of batteries (210), the plurality of batteries (210) are arranged in the box body structure (100).

10. An electrical device (300), characterized in that, Including the battery pack (200) according to claim 9.

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