Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device, the battery device comprises a battery monomer, a box body, a first pressure relief mechanism and a pressure reduction mechanism, the box body is provided with an accommodating cavity, and the battery monomer is accommodated in the accommodating cavity. The box body comprises a first flow channel, and the first flow channel communicates with the containing cavity. The first pressure relief mechanism is arranged in the box body, the pressure relief mechanism is arranged in the first flow channel, and the first flow channel is configured to be capable of guiding the smoke in the containing cavity to the first pressure relief mechanism through the pressure relief mechanism, so that the first pressure relief mechanism is actuated to relieve pressure. According to the battery device provided by the invention, under the condition of thermal runaway of the battery device, the diffusion and evaporation rates of the discharged flue gas are favorably improved, the concentration of the flue gas is reduced, and the pollution of the flue gas discharged by the battery device to the environment is further favorably reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery cell, a battery device and a power utilization device. BACKGROUND

[0002] The battery device is widely used in electronic equipment, such as mobile phone, notebook computer, electric vehicle, electric vehicle, electric aircraft, electric ship, electric toy car, electric toy ship, electric toy aircraft and electric tool, etc.

[0003] In the development of battery device technology, in addition to improving the use performance of battery device, the environmental friendliness of battery device under thermal runaway is also a problem that needs to be considered. Therefore, how to reduce the pollution of the environment under the thermal runaway of the battery device is a continuous improvement problem in the battery device technology. UTILITY MODEL CONTENT

[0004] The present application provides a battery device and a power utilization device to reduce the pollution of the environment under the thermal runaway of the battery device.

[0005] The present application is realized by the following technical scheme:

[0006] In a first aspect, the battery device provided by the embodiments of the present application includes a battery cell, a box, a first pressure relief mechanism and a pressure reduction mechanism. The box has a containing cavity, and the battery cell is contained in the containing cavity. The box includes a first flow channel, and the first flow channel is in communication with the containing cavity. The first pressure relief mechanism is arranged in the box, and the pressure reduction mechanism is arranged in the first flow channel. The first flow channel is configured to guide the flue gas in the containing cavity to the first pressure relief mechanism through the pressure reduction mechanism, so that the first pressure relief mechanism is actuated and the pressure is released.

[0007] The battery device provided by the embodiments of the present application sets the pressure reduction mechanism in the first flow channel, so that in the case of thermal runaway of the battery device, the pressure of the high-pressure flue gas is reduced and the flow rate is increased after the flue gas flows through the pressure reduction mechanism through the first flow channel. The flow rate of the flue gas discharged to the outside of the battery device is increased, and the diffusion and evaporation rate of the flue gas is increased, thereby reducing the concentration of the flue gas, and further reducing the pollution of the flue gas discharged under the thermal runaway of the battery device to the environment.

[0008] According to some embodiments of the present application, the inlet pressure of the pressure reduction mechanism is P1, the actuation pressure of the first pressure relief mechanism is P2, and P1>P2.

[0009] In the above scheme, the time for the flue gas to be treated in the first flow channel of the battery device is increased, and in the process of treating the flue gas in the first flow channel, the content of solid particles or harmful substances in the flue gas can be reduced by adsorption, interception or condensation, etc., which is further conducive to reducing the content of solid particles or harmful substances in the flue gas discharged to the outside of the battery device, and further conducive to reducing the pollution of the flue gas discharged under the condition of thermal runaway of the battery device to the environment.

[0010] According to some embodiments of the present application, the pressure reduction mechanism includes a first pressure reduction mechanism and a second pressure reduction mechanism, and the first pressure reduction mechanism and the second pressure reduction mechanism are arranged at intervals.

[0011] In the above scheme, the flow rate of the flue gas discharged into the air is further increased, the rate of diffusion and evaporation of the flue gas is further increased, the concentration of the flue gas is reduced, and the pollution of the flue gas discharged under the condition of thermal runaway of the battery device to the environment is further reduced.

[0012] According to some embodiments of the present application, along the extension direction of the first flow channel, the second pressure reduction mechanism is arranged between the first pressure reduction mechanism and the first pressure reduction mechanism. The inlet pressures of the first pressure reduction mechanism and the second pressure reduction mechanism are P11 and P12 respectively, and P11>P12.

[0013] In the above scheme, the time for the flue gas to be treated in the first flow channel of the battery device is increased, and in the process of treating the flue gas in the first flow channel, the content of solid particles or harmful substances in the flue gas can be reduced by adsorption, interception or condensation, etc., which is further conducive to reducing the content of solid particles or harmful substances in the flue gas discharged to the outside of the battery device, and further conducive to reducing the pollution of the flue gas discharged under the condition of thermal runaway of the battery device to the environment.

[0014] According to some embodiments of the present application, 1

[0015] In the above scheme, by setting 1

[0016] According to some embodiments of the present application, the actuation pressure of the first pressure reduction mechanism is P2, and P11>P12>P2.

[0017] In the above scheme, P11>P12>P2 is set, which is beneficial to further increase the time for the flue gas to stay in the first flow path, further beneficial to reduce the content of particles or harmful substances in the flue gas, and further beneficial to reduce the pollution of the flue gas discharged by the battery device in the case of thermal runaway to the environment.

[0018] According to some embodiments of the present application, the pressure relief mechanism further comprises a third pressure relief mechanism, which is arranged on the side of the first pressure relief mechanism away from the second pressure relief mechanism along the extension direction of the first flow path, and the inlet pressure of the third pressure relief mechanism is P13, P13>P11.

[0019] In the above scheme, the third pressure relief mechanism is arranged, and P13>P11 is set, which is beneficial to further increase the flow rate of the flue gas discharged to the outside of the battery device through the first pressure relief mechanism, and beneficial to reduce the content of particles or harmful substances in the flue gas discharged to the outside of the battery device, and further beneficial to reduce environmental pollution.

[0020] According to some embodiments of the present application, the battery device further comprises a second pressure relief mechanism arranged in the box, and the second pressure relief mechanism is configured to be actuated and release pressure when the air pressure in the accommodation cavity reaches an actuating pressure, and the actuating pressures of the first pressure relief mechanism and the second pressure relief mechanism are P2 and P3 respectively, P3>P2.

[0021] In the above scheme, the second pressure relief mechanism is arranged, and P3>P2 is set, which is beneficial to improve the risk of explosion of the battery device on the premise of improving the flue gas in the first flow path to be processed more deeply, to further improve the reliability of the battery device.

[0022] According to some embodiments of the present application, the inlet pressure of the pressure relief mechanism is P1, and P3>P1.

[0023] In the above scheme, P3>P1 is set, which is beneficial to further improve the extremity of the flue gas processed in the first flow path, and beneficial to reduce the risk of explosion of the battery device due to thermal runaway.

[0024] According to some embodiments of the present application, the second pressure relief mechanism is arranged on the wall portion of the first flow path, and the first flow path is configured to guide the flue gas in the accommodation cavity to the second pressure relief mechanism to make the second pressure relief mechanism actuated and release pressure; along the extension direction of the first flow path, the second pressure relief mechanism is arranged on the side of the first pressure relief mechanism close to the accommodation cavity.

[0025] In the above scheme, it is beneficial to reduce the risk of explosion of the battery device due to thermal runaway, and also beneficial to simplify the structure of the box.

[0026] According to some embodiments of the present application, the box further comprises a second flow channel configured to guide the flue gas in the accommodation cavity to the second pressure relief mechanism to actuate the second pressure relief mechanism and release pressure.

[0027] In the above scheme, the second flow channel is used to guide the flue gas in the accommodation cavity to the second pressure relief mechanism, which helps to improve the reliability of the actuation of the second mechanism, and in the case of excessive gas pressure in the accommodation cavity, the flue gas can be released through the first flow channel and the second flow channel respectively, which helps to further improve the rate and smoothness of the flue gas discharge inside the battery device in the case of thermal runaway of the battery device, and further reduces the possibility of explosion of the battery device.

[0028] According to some embodiments of the present application, the length of the shortest path from the second pressure relief mechanism to the accommodation cavity through the second flow channel is less than the length of the shortest path from the first pressure relief mechanism to the accommodation cavity through the first flow channel.

[0029] In the above scheme, in the case of thermal runaway of the battery device, it helps to improve the extremity of the flue gas in the first flow channel to be processed to reduce the content of harmful substances or particulate matter in the discharged flue gas, and as the gas pressure of the flue gas in the accommodation cavity increases, it helps to improve the rate of flue gas release, thereby helping to reduce the possibility of explosion of the battery device.

[0030] According to some embodiments of the present application, the pressure relief mechanism comprises a pressure relief valve or a throttle valve.

[0031] In the above scheme, the pressure relief valve and the throttle valve have simple structure, high working reliability, and are easy to install. The pressure relief mechanism comprising a pressure relief valve or a throttle valve helps to simplify the assembly process of the battery device and the structure of the battery device, and improves the possible performance of the battery device.

[0032] According to some embodiments of the present application, the box comprises a beam, the beam is provided with a fluid passage, and the first flow channel comprises the fluid passage.

[0033] In the above scheme, at least part of the first flow channel is arranged in the beam of the box, which helps to simplify the internal structure of the box.

[0034] According to some embodiments of the present application, the beam comprises a cross beam and a longitudinal beam, the cross beam intersects with the longitudinal beam, the fluid passage comprises a first fluid passage and a second fluid passage which are in communication with each other, the first fluid passage is arranged in the cross beam, and the second fluid passage is arranged in the longitudinal beam.

[0035] In the above scheme, the first fluid passage and the second fluid passage are arranged in the cross beam and the longitudinal beam, and the flue gas in the accommodation cavity can flow to the first pressure relief mechanism through the first fluid passage and the second fluid passage, which helps to increase the length of the path of the first flow channel, facilitates the extreme processing of the flue gas, and facilitates the reasonable arrangement of the inlet of the first flow channel according to needs.

[0036] In a second aspect, the use of electricity device provided by the embodiments of the present application comprises the battery device provided by any of the above embodiments.

[0037] The use of electricity device provided by the embodiments of the present application has the same technical effects as the battery device provided by the above embodiments, and thus will not be described here.

[0038] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and thus should not be considered as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0040] Figure 1 The structural schematic diagram of the vehicle provided by the embodiments of the present application is shown in the figure;

[0041] Figure 2 The structural schematic diagram of the battery device provided by the embodiments of the present application is shown in the figure;

[0042] Figure 3 The structural schematic diagram of the battery module in the battery device provided by the embodiments of the present application is shown in the figure;

[0043] Figure 4 The exploded structural schematic diagram of the battery monomer in the battery device provided by the embodiments of the present application is shown in the figure;

[0044] Figure 5 The exploded structural schematic diagram of the battery device provided by the embodiments of the present application is shown in the figure;

[0045] Figure 6 The structural schematic diagram of the battery device provided by the embodiments of the present application is shown in the figure;

[0046] Figure 7 The structural schematic diagram of another battery device provided by the embodiments of the present application is shown in the figure;

[0047] Figure 8 The structural schematic diagram of another battery device provided by the embodiments of the present application is shown in the figure;

[0048] Figure 9 The structural schematic diagram of another battery device provided by the embodiments of the present application is shown in the figure;

[0049] Figure 10Another structural schematic diagram of a battery device provided by an embodiment of the present application.

[0050] In the drawings, the drawings are not necessarily drawn to scale.

[0051] Explanation of reference signs:

[0052] 1 - vehicle;

[0053] 10 - battery device; 11 - case; 11a - accommodation cavity; 11b - first flow passage; 11c - second flow passage; 111 - first sub-case; 112 - second sub-case; 113 - beam; 113a - fluid passage; 1131 - cross beam; 1131a - first fluid passage; 1132 - longitudinal beam; 1132a - second fluid passage; 1a - motor; 1b - controller;

[0054] 20 - battery module;

[0055] 30 - battery cell; 31 - outer shell; 311 - housing; 312 - end cap; 32 - electrode assembly; 321 - electrode body; 322 - tab; 33 - electrode terminal;

[0056] 40 - first pressure relief mechanism;

[0057] 50 - pressure reduction mechanism; 51 - first pressure reduction mechanism; 52 - second pressure reduction mechanism; 53 - third pressure reduction mechanism; 60 - second pressure relief mechanism. DETAILED DESCRIPTION

[0058] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0059] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing the specific embodiments of the present application, and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover not exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application or the above description of drawings are used to distinguish different objects, and are not intended to describe a particular order or primary and secondary relationship.

[0060] Reference within this application to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. As used in this application, the term "or" is intended to mean an inclusive "or" rather than an exclusive "or". That is, unless specified otherwise, or clear from context, "X employs A or B" means that X employs A or B or both. In addition, the term "another" is used interchangeably with "one or more". As used in this application, the term "another" is intended to mean "at least one" or "one or more", unless specified otherwise.

[0061] In the description of the application, it is necessary to explain that, unless otherwise expressly specified and limited, the terms "mount", "connect", "connection", "attach" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0062] In this application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in this application generally represents that the front and rear associated objects have an "or" relationship.

[0063] In this application, "multiple" means more than two (including two), and similarly, "multiple groups" means more than two groups (including two groups), and "multiple pieces" means more than two pieces (including two pieces).

[0064] The battery device mentioned in the embodiments of the application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a hybrid manner through a busbar component.

[0065] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0066] In some embodiments, the battery device can be a battery pack, which includes a box body and one or more battery cell assemblies accommodated in the box body.

[0067] As an example, the battery cell assembly can be a battery module, which can be accommodated in the box body by fixing the battery module in the box body.

[0068] As an example, the battery cell assembly can also be housed in the case by directly fixing a plurality of battery cells to the case.

[0069] In some embodiments, the case can be part of a chassis structure of a vehicle. For example, part of the case can be at least part of a floor of the vehicle, or part of the case can be at least part of a cross beam and a longitudinal beam of the vehicle.

[0070] In some embodiments, the battery device can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0071] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging.

[0072] The battery cell can be, but is not limited to, a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc.

[0073] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are embedded and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allow the active ions to pass through.

[0074] In some embodiments, the positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material arranged on at least one surface of the positive electrode current collector.

[0075] As an example, the positive electrode current collector has two opposite surfaces in the thickness direction of itself, and the positive electrode active material is arranged on any one or both of the two opposite surfaces of the positive electrode current collector.

[0076] As an example, the positive electrode current collector can adopt a metal foil or a composite current collector. For example, as a metal foil, stainless steel, stainless steel, copper, aluminum, carbon electrode, carbon, nickel, or titanium, etc. with silver plating treatment on the surface can be used. The composite current collector can include a high polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a high polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0077] As an example, the positive electrode active material can include at least one of lithium-containing phosphates, lithium transition metal oxides, and modified compounds of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a positive electrode active material of a battery cell can also be used.

[0078] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector.

[0079] As an example, the negative electrode current collector can employ a metal foil or a composite current collector. For example, as a metal foil, aluminum with a silver plating surface treatment, stainless steel with a silver plating surface treatment, copper, aluminum, a carbon electrode, carbon, nickel, titanium, or the like can be employed.

[0080] In some embodiments, the negative electrode current collector has two surfaces opposite in the thickness direction thereof, and the negative electrode active material is disposed on either one or both of the two surfaces of the negative electrode current collector.

[0081] As an example, the negative electrode active material can employ a negative electrode active material for a battery cell known in the art. As an example, the negative electrode active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, lithium titanate, and the like. The silicon-based material can be selected from at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material can be selected from at least one of elemental tin, a tin oxide compound, and a tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a negative electrode active material of a battery cell can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0082] In some embodiments, the separator is a separation film. The present application does not particularly limit the type of the separation film, and any known porous structure separation film having good chemical stability and mechanical stability can be used.

[0083] As an example, the main material of the separation film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride, and ceramic. The separation film can be a single layer film or a multi-layer composite film, and is not particularly limited. When the separation film is a multi-layer composite film, the materials of the respective layers can be the same or different, and are not particularly limited. The separation film can be a separate member located between the positive and negative electrodes, or can be attached to the surface of the positive and negative electrodes.

[0084] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, and functions to transport ions and separate the positive and negative electrodes.

[0085] In some embodiments, the electrode assembly has a wound structure. The positive electrode sheet and the negative electrode sheet are wound to have the wound structure.

[0086] In some embodiments, the electrode assembly is a stacked structure.

[0087] In some embodiments, the battery cell can include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0088] In some embodiments, the housing includes an end cap and a shell body, the shell body is provided with an opening, and the end cap closes the opening to form a sealed space for accommodating the electrode assembly and the electrolyte and the like. The shell body can be provided with one or more openings. The end cap can also be provided with one or more openings.

[0089] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab or indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the shell body.

[0090] In some embodiments, an explosion-proof valve is provided on the housing. The explosion-proof valve is used to release the internal pressure of the battery cell.

[0091] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or a battery cell of other shapes, including a square battery cell, a blade battery cell, a multi-prismatic battery cell, such as a hexagonal battery cell, etc. The embodiments of the present application are not particularly limited.

[0092] In the case of thermal runaway of the battery device, a large amount of high-temperature and high-pressure flue gas is generated inside the battery device, which needs to be discharged to the outside of the battery device to reduce the pressure inside the battery device and reduce the risk of explosion of the battery device. However, in the case of thermal runaway of the battery device, the generated flue gas is discharged into the air, and the high concentration of flue gas can cause some pollution to the environment.

[0093] Therefore, the battery device provided by the embodiments of the present application includes a battery cell, a box body, a first pressure relief mechanism, and a pressure reduction mechanism. The box body has a receiving cavity, and the battery cell is accommodated in the receiving cavity. The box body includes a first flow channel that communicates with the receiving cavity. The first pressure relief mechanism is provided in the box body, and the pressure reduction mechanism is provided in the first flow channel. The first flow channel is configured to guide the flue gas in the receiving cavity to the first pressure relief mechanism through the pressure reduction mechanism, so that the first pressure relief mechanism is actuated and releases pressure.

[0094] The battery device provided by the embodiments of the present application can reduce the pollution of the exhaust gas to the environment in the case of thermal runaway of the battery device.

[0095] The technical solutions described in the embodiments of the present application are suitable for battery monomers, battery devices including battery monomers, and electric devices using the battery devices.

[0096] The battery device disclosed in the embodiments of the present application can be used in, but is not limited to, electric devices such as vehicles, ships or aircraft. The power supply system of the electric device can be composed of the battery device disclosed in the present application.

[0097] The embodiments of the present application provide an electric device using the battery device as a power supply. The electric device can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric vehicle, a ship, a spacecraft, and the like. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric vehicle toy, an electric ship toy, and an electric aircraft toy, and the like. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

[0098] The following embodiments are described with the electric device of an embodiment of the present application as a vehicle for convenience of description.

[0099] Please refer to Figure 1 , Figure 1 The structure schematic diagram of the vehicle 1 provided by the embodiments of the present application is shown in FIG. 1. The vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or a range extended vehicle. The vehicle 1 is internally provided with a battery device 10. The battery device 10 can be arranged at the bottom, the head or the tail of the vehicle 1. The battery device 10 can be used for power supply of the vehicle 1. For example, the battery device 10 can be used as an operating power supply of the vehicle 1, and used for the working power demand of the circuit system of the vehicle 1, such as the starting, navigation and running of the vehicle 1.

[0100] The vehicle 1 can further include a controller 1b and a motor 1a. The controller 1b is used to control the battery device 10 to supply power to the motor 1a, such as the working power demand of the vehicle 1 during starting, navigation and driving.

[0101] In some embodiments of the present application, the battery device 10 can not only be used as an operating power supply of the vehicle 1, but also be used as a driving power supply of the vehicle 1, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1.

[0102] Please refer to Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of the battery device 10 provided in the embodiments of this application. Figure 3 This is a schematic diagram of the structure of the battery module 20 in the battery device 10 provided in an embodiment of this application. The battery device 10 includes a housing 11 and a battery cell 30, with the battery cell 30 housed within the housing 11. The housing 11 provides a space for accommodating the battery cell 30, and the housing 11 can adopt various structures. In some embodiments, the housing 11 may include a first sub-housing 111 and a second sub-housing 112, which overlap each other, and together define a space for accommodating the battery cell 30. The second sub-box 112 can be a hollow structure with one end open, and the first sub-box 111 can be a plate-like structure. The first sub-box 111 covers the opening side of the second sub-box 112 so that the first sub-box 111 and the second sub-box 112 together define the accommodating space. Alternatively, the first sub-box 111 and the second sub-box 112 can both be hollow structures with one side open, and the opening side of the first sub-box 111 covers the opening side of the second sub-box 112.

[0103] In the battery device 10, there can be multiple battery cells 30, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 30 are connected in both series and parallel configurations. Multiple battery cells 30 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 30 is housed within the housing 11. Alternatively, the battery device 10 can also consist of multiple battery cells 30 first connected in series, parallel, or in a mixed manner to form a battery module 20, and then multiple battery modules 20 connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 11. The battery device 10 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 30.

[0104] Among them, the battery cell 30 can be a secondary battery or a primary battery; the battery cell 30 can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited to these.

[0105] Please refer to Figure 4 , Figure 4 This is a schematic diagram of the exploded structure of a single battery cell 30 in the battery device 10 provided in an embodiment of this application. Figure 4 As shown, the battery cell 30 includes a housing 31, an electrode assembly 32, and electrode terminals 33. The housing 31 includes a casing 311 and an end cap 312. The casing 311 has an opening, and the end cap 312 closes the opening to isolate the internal environment of the battery cell 30 from the external environment.

[0106] The shell 311 is a component for fitting the end cover 312 to form an internal environment of the battery cell 30, wherein the formed internal environment can be used to accommodate the electrode assembly 32, the electrolyte and other components. The shell 311 and the end cover 312 can be independent components. The shell 311 can be in various shapes and sizes. Specifically, the shape of the shell 311 can be determined according to the specific shape and size of the electrode assembly 32. The material of the shell 311 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0107] The end cover 312 refers to a component that covers the opening of the shell 311 to isolate the internal environment of the battery cell 30 from the external environment. Without limitation, the shape of the end cover 312 can be adapted to the shape of the shell 311 to fit the shell 311. Optionally, the end cover 312 can be made of a material with certain hardness and strength (such as aluminum alloy), so that the end cover 312 is not easily deformed when subjected to extrusion collision, so that the battery cell 30 can have higher structural strength, and the reliability can also be improved. The end cover 312 can be provided with functional components such as the electrode terminal 33. The electrode terminal 33 can be used to electrically connect with the electrode assembly 32 for outputting or inputting the electrical energy of the battery cell 30. The material of the end cover 312 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not specially limited in the embodiments of the present application. In some embodiments, an insulating structure can also be provided on the inner side of the end cover 312, which can be used to isolate the electrical connection components in the shell 311 from the end cover 312 to reduce the risk of short circuit. Exemplarily, the insulating structure can be plastic, rubber, etc.

[0108] The electrode assembly 32 is a component in which electrochemical reactions occur in the battery cell 30. One or more electrode assemblies 32 can be contained in the shell 311. The electrode assembly 32 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and an isolation film is usually provided between the positive electrode sheet and the negative electrode sheet to separate the positive electrode sheet and the negative electrode sheet to avoid internal short circuit of the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have a part of the active material constituting the electrode body 321 of the electrode assembly 32, and a part of the positive electrode sheet and the negative electrode sheet without the active material each constitutes the tab 322. The positive tab and the negative tab can be located together at one end of the electrode body 321 or respectively at two ends of the electrode body 321. In the charging and discharging process of the battery cell 30, the positive active material and the negative active material react with the electrolyte, and the tab 322 connects the electrode terminal 33 to form a current loop.

[0109] It should be noted that, as shown in FIG. 1, Figure 6 , Figure 7 , Figure 8 , Figure 9 andFigure 10 The structural schematic diagrams of different battery devices 10 are shown respectively, wherein the arrows show the flow direction of the fluid.

[0110] In a first aspect, as Figure 4 , Figure 5 and Figure 6 involved, the battery device 10 provided by the embodiments of the present application comprises a battery cell 30, a box body 11, a first pressure relief mechanism 40 and a pressure reduction mechanism 50. The box body 11 has a containing cavity 11a, and the battery cell 30 is accommodated in the containing cavity 11a. The box body 11 comprises a first flow channel 11b, which is in communication with the containing cavity 11a. The first pressure relief mechanism 40 is arranged in the box body 11, and the pressure reduction mechanism 50 is arranged in the first flow channel 11b. The first flow channel 11b is configured to guide the smoke in the containing cavity 11a to the first pressure relief mechanism 40 through the pressure reduction mechanism 50, so that the first pressure relief mechanism 40 is actuated and the pressure is released.

[0111] The first flow channel 11b is in communication with the containing cavity 11a. The first flow channel 11b can be located in a first sub-box body 111 and a second sub-box body 112 of the box body 11, or part of the first flow channel 11b can be located in the containing cavity 11a and in communication with the containing cavity 11a.

[0112] The first pressure relief mechanism 40 is arranged in the box body 11. Exemplarily, the first pressure relief mechanism 40 can be arranged at the outlet of the first flow channel 11b. In the case of thermal runaway of the battery cell 30, smoke will be generated and released into the containing cavity 11a through the explosion-proof valve of the battery cell 30 and other structures. The smoke in the containing cavity 11a can act on the first pressure relief mechanism 40 through the first flow channel 11b and the pressure reduction mechanism 50. The first pressure relief mechanism 40 can be actuated when the air pressure in the first flow channel 11b reaches a set threshold, and the pressure smoke in the containing cavity 11a is released.

[0113] The pressure reduction mechanism 50 is arranged in the first flow channel 11b. After the smoke in the containing cavity 11a flows into the first flow channel 11b, it first passes through the pressure reduction mechanism 50 for pressure reduction, and then acts on the first pressure relief mechanism 40. When the air pressure reaches the actuation pressure of the first pressure relief mechanism 40, the first pressure relief mechanism 40 is actuated, and the smoke can be discharged to the outside of the box body 11.

[0114] Therefore, along the extension direction of the first flow channel 11b, the pressure reduction mechanism 50 can be arranged on the side of the first pressure relief mechanism 40 close to the containing cavity 11a.

[0115] Optionally, the pressure reduction mechanism 50 can be a pressure reduction valve or a throttle valve, etc. One, two or more pressure reduction mechanisms 50 can be arranged in the first flow channel 11b, which can be selected according to actual needs.

[0116] It can be understood that after the flue gas in the accommodation cavity 11a flows into the first flow channel 11b, the pressure acts on the pressure reduction mechanism 50, and in the case that the pressure of the flue gas is greater than the inlet pressure of the pressure reduction mechanism 50, the pressure reduction mechanism 50 is opened, and the flue gas flows to the first pressure relief mechanism 40 through the pressure reduction mechanism 50, and the pressure of the flue gas at the outlet of the pressure reduction mechanism 50 is less than the pressure of the flue gas at the inlet of the pressure reduction mechanism 50.

[0117] The inlet pressure and outlet pressure of the pressure reduction mechanism 50 can be set according to actual needs. For example, the outlet pressure of the pressure reduction mechanism 50 can be reasonably set according to the actuating pressure of the first pressure relief mechanism 40 and the ideal flow rate of the flue gas discharged to the outside of the box body 11.

[0118] During the process that the flue gas in the accommodation cavity 11a flows through the pressure reduction mechanism 50 through the first flow channel 11b, the pressure reduction mechanism 50 reduces the pressure of the flue gas. According to Bernoulli's equation, after the flue gas flows through the pressure reduction mechanism 50, the pressure is reduced and the flow rate is increased. Therefore, after the first pressure relief mechanism 40 is actuated, the flue gas continues to flow to the first pressure relief mechanism 40 through the first flow channel 11b and is discharged to the outside of the battery device 10 through the first pressure relief mechanism 40.

[0119] That is, after the flue gas flows through the pressure reduction mechanism 50 through the first flow channel 11b, the pressure of the flue gas is reduced and the flow rate is increased, which is beneficial to increase the flow rate of the flue gas discharged to the outside of the box body 11, and further beneficial to increase the rate of diffusion and evaporation of the flue gas in the air, and beneficial to reduce the concentration of the flue gas discharged to the outside of the battery device 10.

[0120] The battery device 10 provided by the embodiment of the present application is provided with the pressure reduction mechanism 50 in the first flow channel 11b, so that in the case of thermal runaway of the battery device 10, after the high-pressure flue gas flows through the pressure reduction mechanism 50 through the first flow channel 11b, the pressure of the flue gas is reduced and the flow rate is increased, so as to increase the flow rate of the flue gas discharged to the outside of the battery device 10, and further increase the rate of diffusion and evaporation of the flue gas, and reduce the concentration of the flue gas, thereby reducing the pollution of the flue gas discharged in the case of thermal runaway of the battery device 10 to the environment.

[0121] In some embodiments, the inlet pressure of the pressure reduction mechanism 50 is P1, and the actuating pressure of the first pressure relief mechanism 40 is P2, and P1>P2.

[0122] It can be understood that the flue gas in the accommodation cavity 11a needs to flow through the pressure reduction mechanism 50 first and then flow to the first pressure relief mechanism 40, so that after the pressure reduction mechanism 50 is opened, the pressure of the flue gas can act on the first pressure relief mechanism 40, and the first pressure relief mechanism 40 can be opened.

[0123] Optionally, a flue gas treatment mechanism can be arranged in the first flow channel 11b to intercept or adsorb the particles or harmful substances in the flue gas flowing through the first flow channel 11b, so as to reduce the content of the particles or harmful substances in the flue gas.

[0124] By setting P1>P2, when the flue gas in the accommodation cavity 11a flows into the first flow channel 11b, the pressure of the flue gas needs to reach P1 to open the pressure relief mechanism 50. In this way, when the flue gas discharged into the accommodation cavity 11a due to thermal runaway of the battery monomer 30 enters the first flow channel 11b, it needs to stay in the first flow channel 11b on the side of the accommodation cavity 11a of the pressure relief mechanism 50 until the pressure of the flue gas reaches P1.

[0125] In this way, it is beneficial to increase the time for the flue gas to be treated in the first flow channel 11b of the battery device 10. During the treatment of the flue gas in the first flow channel 11b, the content of solid particles or harmful substances in the flue gas can be reduced by adsorption, interception or condensation, which is further beneficial to reduce the content of solid particles or harmful substances in the flue gas discharged to the outside of the battery device 10, and further beneficial to reduce the pollution of the flue gas discharged under the condition of thermal runaway of the battery device 10 to the environment.

[0126] In some embodiments, as shown in Figure 7 The pressure relief mechanism 50 includes a first pressure relief mechanism 51 and a second pressure relief mechanism 52, and the first pressure relief mechanism 51 and the second pressure relief mechanism 52 are arranged at intervals.

[0127] The flue gas in the accommodation cavity 11a flows into the first flow channel 11b, and then passes through the first pressure relief mechanism 51 and the second pressure relief mechanism 52 twice to increase the speed, and then is discharged to the outside of the battery device 10 through the first pressure relief mechanism 40.

[0128] In this way, it is beneficial to further increase the flow rate of the flue gas discharged into the air, further beneficial to increase the rate of diffusion and evaporation of the flue gas, reduce the concentration of the flue gas, and further beneficial to reduce the pollution of the flue gas discharged under the condition of thermal runaway of the battery device 10 to the environment.

[0129] In some embodiments, as shown in Figure 7 The second pressure relief mechanism 52 is arranged between the first pressure relief mechanism 51 and the first pressure relief mechanism 40 along the extension direction of the first flow channel 11b. The inlet pressures of the first pressure relief mechanism 51 and the second pressure relief mechanism 52 are P11 and P12 respectively, and P11>P12.

[0130] In this way, under the condition of thermal runaway of the battery device 10, the flue gas enters the first flow channel 11b from the accommodation cavity 11a, and needs to pass through the first pressure relief mechanism 51 first, and then pass through the second pressure relief mechanism 52, and then flow to the first pressure relief mechanism 40.

[0131] Since the first pressure relief mechanism 51 needs to be opened before the second pressure relief mechanism 52 is opened, and P11 is greater than P12, the flue gas needs to stay in the first flow channel 11b of the first pressure relief mechanism 40 near the accommodation cavity 11a for a longer time before the first pressure relief mechanism 51 is opened, until the pressure of the flue gas reaches P11.

[0132] In this way, it is beneficial to increase the time for the flue gas to be treated in the first flow channel 11b of the battery device 10, and during the treatment of the flue gas in the first flow channel 11b, the content of solid particles or harmful substances in the flue gas can be reduced by adsorption, interception or condensation, etc., which is further beneficial to reduce the content of solid particles or harmful substances in the flue gas discharged to the outside of the battery device 10, and further beneficial to reduce the pollution of the flue gas discharged under the condition of thermal runaway of the battery device 10 to the environment.

[0133] In some embodiments, 1 < P11 / P12 ≤ 10.

[0134] Alternatively, P11 / P12 can be 1.1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5 or 10, etc.

[0135] It can be understood that the greater the value of P11 / P12, the longer the flue gas stays in the first flow channel 11b, and the longer the flue gas stays in the first flow channel 11b before the pressure relief mechanism 50 is opened, the more conducive to treating the flue gas to reduce the content of harmful substances or particles in the flue gas. The smaller the value of P11 / P12, the shorter the time for the flue gas in the accommodation cavity 11a to stay inside the battery device 10, and the more conducive to timely pressure relief of the battery device 10 to improve the reliability of the battery device 10.

[0136] Therefore, the inventors have found through systematic analysis and long-term practice that by setting 1 < P11 / P12 ≤ 10, it is beneficial to increase the residence time of the flue gas inside the battery device 10 to improve the extreme treatment of the flue gas by the battery device 10, reduce the pollution of the flue gas to the environment, and timely discharge of the flue gas under the condition of thermal runaway of the battery device 10 to reduce the risk of explosion of the battery device 10, and improve the reliability of the battery device 10.

[0137] In some embodiments, the actuation pressure of the first pressure relief mechanism 40 is P2, and P11 > P12 > P2.

[0138] Therefore, the first pressure relief mechanism 40 is opened, the flue gas enters the first flow channel 11b, and then stays for a period of time before the first pressure relief mechanism 51 is opened. After the first pressure relief mechanism 51 is opened, the flue gas stays for a longer period of time again in the first flow channel 11b between the first pressure relief mechanism 51 and the second pressure relief mechanism 52 before the second pressure relief mechanism 52 is opened. Then, after the second pressure relief mechanism 52 is opened, the flue gas acts on the first pressure relief mechanism 40 again.

[0139] Therefore, P11>P12>P2 is set, which is beneficial to further increase the time for the flue gas to stay in the first flow channel 11b, further reduce the content of particles or harmful substances in the flue gas, and further reduce the pollution of the flue gas discharged from the battery device 10 in the case of thermal runaway to the environment.

[0140] In some embodiments, as shown in Figure 8 The pressure relief mechanism 50 further includes a third pressure relief mechanism 53. The third pressure relief mechanism 53 is arranged on the side of the first pressure relief mechanism 51 away from the second pressure relief mechanism 52 along the extension direction of the first flow channel 11b. The inlet pressure of the third pressure relief mechanism 53 is P13, and P13>P11.

[0141] Therefore, in the case of thermal runaway of the battery device 10, the flue gas in the accommodation cavity 11a first passes through the pressure relief and speed increase of the third pressure relief mechanism 53, the first pressure relief mechanism 51, and the second pressure relief mechanism 52, and then is discharged to the outside of the box body 11 through the first pressure relief mechanism 40.

[0142] Therefore, P13>P11 is set, which is beneficial to increase the time for the flue gas to stay in the first flow channel 11b on the side of the first pressure relief mechanism 51 close to the accommodation cavity 11a, facilitate deeper processing of the flue gas, and reduce the content of harmful substances or particles in the flue gas.

[0143] Therefore, the third pressure relief mechanism 53 is arranged, and P13>P11 is set, which is beneficial to further increase the flow rate of the flue gas discharged to the outside of the battery device 10 through the first pressure relief mechanism 40, reduce the content of particles or harmful substances in the flue gas discharged to the outside of the battery device 10, and further reduce environmental pollution.

[0144] In some embodiments, as shown in Figure 9 The battery device 10 further includes a second pressure relief mechanism 60 arranged in the box body 11. The second pressure relief mechanism 60 is configured to be actuated and release pressure when the air pressure in the accommodation cavity 11a reaches an actuation pressure. The actuation pressures of the first pressure relief mechanism 40 and the second pressure relief mechanism 60 are P2 and P3 respectively, and P3>P2.

[0145] Understandably, in the event of thermal runaway of the battery device 10, high-temperature and high-pressure gas gradually accumulates in the accommodating cavity 11a. If the gas pressure in the battery device 10 is too high, it will pose a risk of explosion. Therefore, a second pressure relief mechanism 60 is provided, and the actuation pressure P3 of the second pressure relief mechanism 60 is set to be greater than the actuation pressure P2 of the first pressure relief mechanism 40. When the gas pressure in the accommodating cavity 11a is low, it can be relieved through the first flow channel 11b and the first pressure relief mechanism 40 to improve the effectiveness of flue gas treatment. As the gas pressure in the accommodating cavity 11a further increases, when it reaches the actuation pressure of the second pressure relief mechanism 60, the second pressure relief mechanism 60 is activated and relieves pressure to increase the rate of pressure release in the accommodating cavity 11a, which helps to reduce the risk of explosion of the battery device 10.

[0146] Therefore, setting a second pressure relief mechanism 60 and setting P3 > P2 is beneficial to not only improve the deeper treatment of flue gas in the first flow channel 11b, but also to reduce the risk of battery device 10 explosion, thereby further improving the reliability of battery device 10.

[0147] In some embodiments, the inlet pressure of the pressure reducing mechanism 50 is P1, where P3 > P1.

[0148] If P3 is greater than P1, the second pressure relief mechanism 60 will not be activated before the pressure reduction mechanism 50 is opened. In the event of thermal runaway of the battery device 10, the flue gas in the accommodating cavity 11a will be preferentially released through the first flow channel 11b, the pressure reduction mechanism 50 and the first pressure relief mechanism 40. This allows the flue gas to be treated more thoroughly in the first flow channel 11b, which helps to reduce the content of harmful substances or particles in the flue gas discharged to the outside of the battery device 10 and helps to reduce environmental pollution.

[0149] As the air pressure in the accommodating cavity 11a gradually increases, the second pressure relief mechanism 60 is activated and releases the pressure to quickly discharge the flue gas in the accommodating cavity 11a.

[0150] Therefore, setting P3 > P1 is beneficial to further improve the efficiency of flue gas treatment in the first flow channel 11b and to reduce the risk of battery device 10 exploding due to thermal runaway.

[0151] In some embodiments, such as Figure 9 As shown, the second pressure relief mechanism 60 is disposed on the wall of the first flow channel 11b. The first flow channel 11b is configured to guide the flue gas in the accommodating cavity 11a to the second pressure relief mechanism 60, so that the second pressure relief mechanism 60 is actuated and releases pressure. Along the extending direction of the first flow channel 11b, the second pressure relief mechanism 60 is disposed on the side of the first pressure relief mechanism 40 near the accommodating cavity 11a.

[0152] Thus, in the case that the air pressure in the accommodation cavity 11a is small, the second pressure relief mechanism 60 is closed, and the flue gas needs to flow through a longer path in the first flow channel 11b before being discharged through the first pressure relief mechanism 40. In the case that the air pressure in the accommodation cavity 11a is large, the second pressure relief mechanism 60 is actuated, and part of the flue gas can flow through a smaller path in the first flow channel 11b, i.e., can be discharged through the second pressure relief mechanism 60, and the first pressure relief mechanism 40 and the second pressure relief mechanism 60 can simultaneously discharge pressure.

[0153] Further, the second pressure relief mechanism 60 shares a part of the first flow channel 11b with the first pressure relief mechanism 40, which is conducive to simplifying the structure inside the box 11.

[0154] Therefore, by being thus configured, it is conducive to reducing the risk of explosion of the battery device 10 due to thermal runaway while simplifying the structure of the box 11.

[0155] In some embodiments, as shown in FIG. 1, the box 11 further includes a second flow channel 11c configured to guide the flue gas in the accommodation cavity 11a to the second pressure relief mechanism 60 so as to actuate the second pressure relief mechanism 60 and discharge pressure. Figure 10

[0156] The second flow channel 11c is used to guide the flue gas in the accommodation cavity 11a to the second pressure relief mechanism 60, which is conducive to improving the reliability of actuation of the second mechanism, and in the case that the air pressure in the accommodation cavity 11a is too high, the flue gas can be discharged through the first flow channel 11b and the second flow channel 11c respectively, which is conducive to further improving the rate and smoothness of flue gas discharge inside the battery device 10 in the case of thermal runaway of the battery device 10, and further reducing the possibility of explosion of the battery device 10.

[0157] In some embodiments, the length of the shortest path from the second pressure relief mechanism 60 to the accommodation cavity 11a through the second flow channel 11c is smaller than the length of the shortest path from the first pressure relief mechanism 40 to the accommodation cavity 11a through the first flow channel 11b.

[0158] Thus, in the case of thermal runaway of the battery device 10, in the case that the air pressure in the accommodation cavity 11a is not high and the second pressure relief mechanism 60 has not been actuated, the flue gas needs to flow through a longer path in the first flow channel 11b before being discharged through the first pressure relief mechanism 40. The longer the path of the flue gas flowing in the first flow channel 11b, the longer the flue gas stays in the first flow channel 11b, which is conducive to improving the completeness of treatment of the flue gas in the first flow channel 11b, so as to reduce the content of harmful substances or particulate matters in the discharged flue gas.

[0159] ​With the increase of the gas pressure in the accommodating cavity 11a, the pressure of the flue gas acts on the second pressure relief mechanism 60 through the second flow channel 11c, and the second pressure relief mechanism 60 is actuated and starts to release pressure. Since the path of the flue gas released to the outside of the battery device 10 through the second flow channel 11c and the second pressure relief mechanism 60 is smaller than the path of the flue gas released to the outside of the battery device 10 through the first flow channel 11b and the first pressure relief mechanism 40, thus, it is beneficial to increase the rate of flue gas release, and further beneficial to reduce the possibility of explosion of the battery device 10 in the case of thermal runaway.

[0160] Therefore, thus, in the case of thermal runaway of the battery device 10, it is beneficial to increase the extremity of the flue gas processed in the first flow channel 11b to reduce the content of harmful substances or particulate matters in the discharged flue gas, and with the increase of the gas pressure of the flue gas in the accommodating cavity 11a, it is beneficial to increase the rate of flue gas release, and further beneficial to reduce the possibility of explosion of the battery device 10.

[0161] In some embodiments, the pressure relief mechanism 50 includes a pressure relief valve or a throttle valve.

[0162] It can be understood that the pressure relief valve and the throttle valve have simple structure, high working reliability, and are easy to install. The pressure relief mechanism 50 including the pressure relief valve or the throttle valve is beneficial to simplify the assembly process of the battery device 10, and is beneficial to simplify the structure of the battery device 10 and improve the possible performance of the battery device 10.

[0163] In some embodiments, the box 11 includes a beam 113, the beam 113 is provided with a fluid passage 113a, and the first flow channel 11b includes the fluid passage 113a.

[0164] Thus, at least part of the first flow channel 11b is arranged by using the beam 113 inherent to the box 11, which is beneficial to simplify the internal structure of the box 11.

[0165] In some embodiments, the beam 113 includes a cross beam 1131 and a longitudinal beam 1132, the cross beam 1131 intersects the longitudinal beam 1132, the fluid passage 113a includes a first fluid passage 1131a and a second fluid passage 1132a which are in communication with each other, the first fluid passage 1131a is arranged in the cross beam 1131, and the second fluid passage 1132a is arranged in the longitudinal beam 1132.

[0166] Thus, the first fluid passage 1131a and the second fluid passage 1132a are arranged by using the cross beam 1131 and the longitudinal beam 1132, the flue gas in the accommodating cavity 11a can flow to the first pressure relief mechanism 40 through the first fluid passage 1131a and the second fluid passage 1132a, which is beneficial to increase the length of the path of the first flow channel 11b, facilitate the extreme processing of the flue gas, and facilitate the reasonable arrangement of the inlet of the first flow channel 11b according to needs.

[0167] In a second aspect, the battery device 10 provided by any of the above embodiments is used to provide electric energy.

[0168] The battery device 10 provided by any of the above embodiments is used to provide electric energy.

[0169] In some embodiments, the battery device 10 includes a battery cell 30, a box 11, a pressure reduction mechanism 50, a first pressure relief mechanism 40, and a second pressure relief mechanism 60. The box 11 has a receiving cavity 11a in which the battery cell 30 is accommodated. The box 11 includes a first flow channel 11b that is in communication with the receiving cavity 11a. The first pressure relief mechanism 40 and the second pressure relief mechanism 60 are arranged in the box 11. The pressure reduction mechanism 50 is arranged in the first flow channel 11b. The first flow channel 11b is configured to guide the flue gas in the receiving cavity 11a to the first pressure relief mechanism 40 via the pressure reduction mechanism 50, so that the first pressure relief mechanism 40 is actuated and releases pressure. The pressure reduction mechanism 50 includes a first pressure reduction mechanism 51 and a second pressure reduction mechanism 52, which are arranged at intervals. Along the extension direction of the first flow channel 11b, the second pressure reduction mechanism 52 is arranged between the first pressure reduction mechanism 51 and the first pressure relief mechanism 40. The second pressure relief mechanism 60 is configured to be actuated and release pressure when the air pressure in the receiving cavity 11a reaches an actuation pressure. The inlet pressures of the first pressure reduction mechanism 51 and the second pressure reduction mechanism 52 are P11 and P12, respectively, and P11>P12. The actuation pressure of the first pressure relief mechanism 40 is P2, and the actuation pressure of the second pressure relief mechanism 60 is P3, and P3>P11>P12>P2. The box 11 includes a beam 113 in which a fluid passage 113a is arranged, and the first flow channel 11b includes the fluid passage 113a.

[0170] The battery device 10 provided by any of the above embodiments is used to provide electric energy.

[0171] Although the present application has been described with reference to preferred embodiments, various modifications can be made to the application without departing from the scope of the application. In particular, the technical features mentioned in the various embodiments can be combined in any way, provided that there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized by, The battery device comprises: a battery cell; a box having a receiving cavity in which the battery cell is accommodated, the box comprising a first flow channel in communication with the receiving cavity; a first pressure relief mechanism provided in the box; a pressure reduction mechanism provided in the first flow channel, the first flow channel being configured to guide the flue gas in the receiving cavity to the first pressure relief mechanism via the pressure reduction mechanism, so that the first pressure relief mechanism is actuated and pressure is released.

2. The battery device according to claim 1, characterized by The inlet pressure of the pressure reduction mechanism is P1, and the actuation pressure of the first pressure relief mechanism is P2, P1>P2.

3. The battery device of claim 1, wherein The pressure reduction mechanism comprises a first pressure reduction mechanism and a second pressure reduction mechanism, and the first pressure reduction mechanism and the second pressure reduction mechanism are arranged in a spaced manner.

4. The battery device of claim 3, wherein Along the extension direction of the first flow channel, the second pressure reduction mechanism is arranged between the first pressure reduction mechanism and the first pressure relief mechanism. The inlet pressures of the first pressure reduction mechanism and the second pressure reduction mechanism are P11 and P12 respectively, P11>P12.

5. The battery device of claim 4, wherein, 1 6. The battery device of claim 4, wherein The actuation pressure of the first pressure relief mechanism is P2, P11>P12>P2.

7. The battery device of claim 4, wherein The pressure reduction mechanism further comprises a third pressure reduction mechanism, and along the extension direction of the first flow channel, the third pressure reduction mechanism is arranged on the side of the first pressure reduction mechanism away from the second pressure reduction mechanism, and the inlet pressure of the third pressure reduction mechanism is P13, P13>P11.

8. The battery device of claim 1, wherein The battery device further comprises a second pressure relief mechanism provided in the box, and the second pressure relief mechanism is configured to be actuated and release pressure when the air pressure in the receiving cavity reaches the actuation pressure, and the actuation pressures of the first pressure relief mechanism and the second pressure relief mechanism are P2 and P3 respectively, P3>P2.

9. The battery device of claim 8, wherein, The inlet pressure of the pressure reduction mechanism is P1, and P3>P1.

10. The battery device of claim 8, wherein, The second pressure relief mechanism is arranged on the wall of the first flow channel, and the first flow channel is configured to guide the flue gas in the receiving cavity to the second pressure relief mechanism, so that the second pressure relief mechanism is actuated and pressure is released; along the extension direction of the first flow channel, the second pressure relief mechanism is arranged on the side of the first pressure relief mechanism close to the receiving cavity.

11. The battery device of claim 8, wherein, The box further comprises a second flow channel configured to guide the flue gas in the receiving cavity to the second pressure relief mechanism, so that the second pressure relief mechanism is actuated and pressure is released.

12. The battery device of claim 11, wherein, The length of the shortest path from the second pressure relief mechanism to the receiving cavity via the second flow channel is less than the length of the shortest path from the first pressure relief mechanism to the receiving cavity via the first flow channel.

13. The battery device according to any one of claims 1 to 12, characterized by, The pressure reduction mechanism comprises a pressure reduction valve or a throttle valve.

14. The battery device according to any one of claims 1 to 12, characterized by The box comprises a beam, and a fluid passage is arranged in the beam, and the first flow channel comprises the fluid passage.

15. The battery device of claim 14, wherein, The beam comprises a cross beam and a longitudinal beam, the cross beam intersects with the longitudinal beam, and the fluid passage comprises a first fluid passage and a second fluid passage in communication with each other, the first fluid passage is arranged in the cross beam, and the second fluid passage is arranged in the longitudinal beam.

16. An electrical device, comprising: The battery device as claimed in any one of claims 1 to 15 is used to provide electric energy.

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