Battery and electric equipment

Abstract

The embodiment of the invention provides a battery and electric equipment, and belongs to the technical field of batteries. Wherein the battery comprises a box body, a battery monomer and a treatment device, the battery is accommodated in the box body, the treatment device is used for treating exhaust gas discharged into the box body by the battery monomer so as to adjust the concentration of preset gas in the exhaust gas to be below a corresponding preset value, and the preset gas is one or more mixed combustible gas. Through the treatment device, the exhaust gas discharged into the box body when the single battery is in thermal runaway can be treated, so that the concentration of one or more mixed combustible gases in the exhaust gas is reduced to be below a preset value, the flammability grade of the combustible gases is reduced, the risk of combustion explosion of the battery is reduced, and the safety of the battery is effectively improved.

Description

Batteries and electrical equipment Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery and an electrical device. Background Art

[0002] With the development of new energy technologies, batteries are being used more and more widely, for example in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and power tools.

[0003] In battery technology, both battery performance and battery safety need to be considered. Therefore, how to improve battery safety is an urgent problem to be solved in battery technology.

[0004] Summary of the Invention

[0005] The embodiments of the present application provide a battery and an electrical device that can effectively improve the safety of the battery.

[0006] In a first aspect, an embodiment of the present application provides a battery, comprising a casing, a battery cell, and a processing device, which is housed in the casing. The processing device is used to process the exhaust gas discharged from the battery cell into the casing so as to adjust the concentration of a preset gas in the exhaust gas to below a corresponding preset value, wherein the preset gas is one or more mixed combustible gases.

[0007] In the above technical solution, a processing device is provided in the box, which can process the exhaust gas discharged into the box when the battery cell thermal runaways, thereby reducing the concentration of one or more mixed combustible gases in the exhaust gas to below the preset value, reducing the flammability level of the combustible gas, reducing the risk of battery combustion and explosion, and effectively improving the safety of the battery.

[0008] In some embodiments, the preset gas is electrolyte vapor, and the preset value is 3.6%. The concentration of the electrolyte vapor is adjusted to below 3.6% by a processing device, so that the concentration of the electrolyte vapor is below the lower flammability limit, reducing the risk of electrolyte vapor combustion and improving battery safety.

[0009] In some embodiments, the preset gas is a combustible gas mixture of H2, CO, and alkanes, with a preset value of 7.6%. The concentration of the combustible gas mixture of H2, CO, and alkanes is adjusted to below 7.6% by a processing device, so that the concentration of the combustible gas mixture of H2, CO, and alkanes is below the lower flammability limit, reducing the risk of combustion of the combustible gas mixture of H2, CO, and alkanes and improving battery safety.

[0010] In some embodiments, the preset gas is all combustible gases in the exhaust gas, and the preset value is 8.3%. The concentration of the combustible gas mixed with all combustible gases in the exhaust gas is adjusted to below 8.3% by the processing device, thereby reducing the risk of exhaust gas combustion and improving battery safety.

[0011] In some embodiments, the battery further includes a detection unit and a control unit; the detection unit is disposed within the housing and is configured to detect the concentration of a predetermined gas; the control unit is electrically connected to the detection unit and the processing device and is configured to control the processing device to release a treatment medium when the concentration of the predetermined gas in the exhaust gas exceeds a corresponding predetermined value. When the detection unit detects that the predetermined gas exceeds the corresponding predetermined value, the control unit controls the processing device to release a treatment system to adjust the concentration of the predetermined gas to below the corresponding predetermined value, thereby achieving automated control of the processing device.

[0012] In some embodiments, the processing device includes a receiving component and a switch unit. The receiving component defines a storage space for accommodating a processing medium. The switch unit is electrically connected to a control unit, which is configured to control the switch unit to open when the concentration of a preset gas exceeds a corresponding preset value, thereby releasing the processing medium. The control unit controls the switch unit to open, thereby releasing the processing medium contained within the receiving component to process the exhaust gas within the housing. The overall structure of the processing device is simple.

[0013] In some embodiments, the battery further comprises a pressure relief mechanism, which is disposed in the housing and electrically connected to a control unit. The control unit is configured to control the activation of the pressure relief mechanism to release the pressure inside the housing when the concentration of the preset gas is lower than a corresponding preset value. The control unit can automatically control the pressure relief mechanism disposed on the housing. When the processing device releases the processing medium to adjust the concentration of the preset gas to lower than the corresponding preset value, the control unit will control the activation of the pressure relief mechanism, thereby discharging the exhaust gas that has met the exhaust requirements inside the housing to the outside of the housing to reduce the pressure inside the housing.

[0014] In some embodiments, the battery further includes a pressure relief mechanism configured to release pressure within the housing upon activation. The housing includes a first space and a second space separated therefrom, the first space being configured to accommodate battery cells and the second space being configured to accommodate exhaust gases. The pressure relief mechanism is configured to connect the housing exterior and the second space upon activation. The first and second spaces of the housing are separated from each other to accommodate battery cells and exhaust gases, respectively, isolating the battery cells and exhaust gases from each other, reducing the impact of exhaust gases on the battery cells and further improving safety.

[0015] In some embodiments, the battery cell has a pressure relief portion disposed toward the second space, so that exhaust gas discharged when the battery cell experiences thermal runaway can more easily enter the second space.

[0016] In some embodiments, the first space and the second space are separated by a separator, and the separator is provided with a channel, which connects the first space and the second space. In this way, the first space and the second space are in a connected state, and exhaust gas discharged when the battery cell experiences thermal runaway can enter the second space through the channel.

[0017] In some embodiments, the battery cell has a pressure relief portion located at one end of the channel along the through-going direction and disposed toward the channel. In this way, exhaust gas discharged during thermal runaway of the battery cell can directly enter the channel, allowing the exhaust gas to enter the second space more quickly.

[0018] In some embodiments, the processing device includes a partition having an inner cavity for accommodating a processing medium, and a switch portion provided on the sidewall of the channel. The switch portion is configured to allow the processing medium in the inner cavity to flow out through the switch portion when opened. The partition serves as both a partition component separating the first space from the second space and a processing component for providing the processing medium. As the exhaust gas enters the second space through the channel, the processing medium in the inner cavity can be released through the switch portion, thereby more quickly reducing the concentration of the preset gas in the exhaust gas.

[0019] In some embodiments, the switch portion is a nozzle, and the nozzle's spray direction intersects the through-direction of the channel. This allows the treatment medium sprayed from the nozzle to more fully mix with the exhaust gas, resulting in a better treatment effect on the exhaust gas and a faster reduction in the concentration of the predetermined gas in the exhaust gas.

[0020] In some embodiments, the first and second spaces are separated by a partition, which is provided with a switch mechanism configured to connect or disconnect the first and second spaces. Providing the switch mechanism on the partition enables connection or disconnection between the first and second spaces. Under normal operating conditions, the switch mechanism can be closed, making the first and second spaces independent of each other. When a battery cell experiences thermal runaway, the switch mechanism can be opened, connecting the first and second spaces, allowing exhaust gas to flow from the first space into the second space.

[0021] In some embodiments, the switch mechanism is a weak portion that is configured to connect the first space and the second space after being destroyed by the exhaust gas. This switch mechanism can be passively opened by the exhaust gas, has a simple structure, and is very economical.

[0022] In some embodiments, the processing device is disposed in the second space. After the exhaust gas enters the second space, the processing device can process the exhaust gas in the second space, thereby reducing the concentration of the preset gas in the exhaust gas.

[0023] In some embodiments, the battery cell has a pressure relief portion; the treatment device includes a support member for supporting the battery cell, and a relief cavity is provided on the side of the support member facing the battery cell. The relief cavity is configured to avoid the pressure relief portion and contains a treatment medium. In this way, exhaust gas discharged from the pressure relief portion can flow directly into the treatment medium, thereby rapidly reducing the concentration of a predetermined gas in the exhaust gas through the treatment medium.

[0024] In some embodiments, the battery cell has a pressure relief portion; the processing device includes a support member for supporting the battery cell; a side of the support member facing the battery cell is provided with a relief chamber for avoiding the pressure relief portion; the relief chamber is provided with a trigger mechanism; the support member is internally provided with a receiving chamber for receiving a treatment medium; the trigger mechanism is configured to allow the treatment medium in the receiving chamber to be discharged through the trigger mechanism upon triggering. When the battery cell thermally runs away, the exhaust gas within the battery cell will be discharged into the relief chamber through the pressure relief portion. Because the trigger mechanism is provided with the relief chamber, after the trigger mechanism is triggered, the treatment medium discharged through the trigger mechanism can be fully mixed with the exhaust gas in the relief chamber, thereby rapidly reducing the concentration of the predetermined gas in the exhaust gas.

[0025] In some embodiments, the trigger mechanism is configured to be triggered by exhaust gas. Under normal operating conditions, the trigger mechanism is in an untriggered state, and the processing medium contained in the accommodating chamber is not discharged. When a battery cell experiences thermal runaway, the trigger mechanism can be triggered by the exhaust gas emitted by the battery cell, thereby causing the processing medium to be discharged in a timely manner to reduce the concentration of the predetermined gas in the exhaust gas.

[0026] In some embodiments, the support member is configured as a thermal management component, capable of managing the temperature of the battery cells and reducing the concentration of a predetermined gas in the exhaust gas.

[0027] In a second aspect, an embodiment of the present application further provides an electrical device, comprising the battery provided in any one embodiment of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0029] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0030] FIG2 is an exploded view of a battery provided in some embodiments of the present application;

[0031] FIG3 is a schematic structural diagram of the battery shown in FIG2 ;

[0032] FIG4 is a control principle diagram of a processing device provided in an embodiment of the present application;

[0033] FIG5 is a schematic structural diagram of the box shown in FIG4 ;

[0034] FIG6 is a schematic structural diagram of batteries provided in other embodiments of the present application;

[0035] FIG7 is a partial enlarged view of the battery shown in FIG6 at point A;

[0036] FIG8 is a schematic structural diagram of batteries provided in some other embodiments of the present application;

[0037] FIG9 is a schematic structural diagram of a battery provided in some further embodiments of the present application;

[0038] FIG10 is an exploded view of a battery cell and a support member provided in some embodiments of the present application;

[0039] FIG11 is a schematic structural diagram of the support member shown in FIG10 .

[0040] Icons: 10-housing; 11-first part; 12-second part; 13-first space; 14-second space; 15-partition; 151-channel; 152-inner cavity; 153-switch part; 154-switch mechanism; 20-battery cell; 21-pressure relief part; 30-processing device; 31-accommodation component; 311-accommodation space; 32-switch unit; 33-support member; 331-avoidance chamber; 332-trigger mechanism; 40-convergence component; 50-detection unit; 60-control unit; 70-pressure relief mechanism; 100-battery; 200-controller; 300-motor; 1000-vehicle; X-injection direction; Y-through direction. DETAILED DESCRIPTION

[0041] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0042] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0043] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0044] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0045] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0046] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0047] The term "plurality" used in this application refers to two or more (including two).

[0048] In this application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application do not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0049] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or a battery pack. A battery generally includes a casing that encloses one or more battery cells. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0050] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet comprises a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive electrode collector. The portion of the positive electrode collector not coated with the positive active material layer protrudes from the portion coated with the positive active material layer. The portion of the positive electrode collector not coated with the positive active material layer serves as the positive electrode tab. For lithium-ion batteries, for example, the positive electrode current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet comprises a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative electrode collector. The portion of the negative electrode collector not coated with the negative active material layer protrudes from the portion coated with the negative active material layer. The portion of the negative electrode collector not coated with the negative active material layer serves as the negative electrode tab. The negative electrode current collector can be made of copper, and the negative active material can be carbon or silicon, among others. To ensure high current flow without melting, multiple positive tabs are stacked together, and multiple negative tabs are stacked together. The separator can be made of materials such as PP (polypropylene) or PE (polyethylene). Furthermore, the electrode assembly can be a wound or laminated structure, but the present invention is not limited thereto.

[0051] The development of battery technology must take into account multiple design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, battery safety must also be considered.

[0052] In order to improve the safety of the battery, a pressure relief mechanism is generally provided on the box. When the battery cells in the box thermally run away, the pressure inside the box is released through the pressure relief mechanism, thereby improving the safety of the battery.

[0053] The inventors noticed that in a battery, after a battery cell experiences thermal runaway, the battery cell will emit exhaust gas, and the exhaust gas in the box will eventually be discharged to the outside of the box through a pressure relief mechanism. The exhaust gas discharged to the outside of the box contains a large amount of combustible gases, such as H2, CO, alkanes or electrolyte vapor, etc. These combustible gases require very small ignition capabilities. With the participation of combustion-supporting materials (such as oxygen), they can easily be ignited by tiny ignition sources, causing violent combustion, and even battery explosion, resulting in safety accidents.

[0054] Based on the above considerations, in order to improve the safety of the battery, the inventors have conducted in-depth research and designed a battery. By arranging a processing device in the box, the exhaust gas discharged from the battery cells into the box is processed by the processing device to adjust the concentration of a preset gas in the exhaust gas to below the corresponding preset value, where the preset gas is one or more mixed combustible gases.

[0055] In such a battery, the exhaust gas discharged into the box during thermal runaway of the battery cell can be processed by a processing device, thereby reducing the concentration of one or more mixed combustible gases in the exhaust gas to below a preset value, reducing the flammability level of the combustible gas, reducing the risk of battery combustion and explosion, and effectively improving the safety of the battery.

[0056] The battery described in the embodiments of the present application is suitable for use in electrical devices that use the battery.

[0057] Electrical equipment can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and electric tools, etc. Vehicles can be fuel vehicles, gas vehicles, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles, or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical equipment.

[0058] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device.

[0059] Please refer to Figure 1, which is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application. A battery 100 is disposed within vehicle 1000. Battery 100 can be located at the bottom, front, or rear of vehicle 1000. Battery 100 can be used to power vehicle 1000, for example, as an operating power source for vehicle 1000.

[0060] The vehicle 1000 may further include a controller 200 and a motor 300 . The controller 200 is used to control the battery 100 to supply power to the motor 300 , for example, to meet the power requirements of the vehicle 1000 during startup, navigation, and driving.

[0061] In some embodiments of the present application, the battery 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0062] Please refer to Figures 2 and 3. Figure 2 is an exploded view of a battery 100 provided in some embodiments of the present application; Figure 3 is a structural schematic diagram of the battery 100 shown in Figure 2. The battery 100 includes a case 10, a battery cell 20 and a processing device 30. The battery cell 20 and the processing device 30 are both accommodated in the case 10. The processing device 30 is used to process the exhaust gas discharged from the battery cell 20 into the case 10 to adjust the concentration of a preset gas in the exhaust gas to below a corresponding preset value. The preset gas is one or more mixed combustible gases.

[0063] The housing 10 is a component that houses the battery cells 20, providing storage space for the battery cells 20. The housing 10 can have a variety of structures. For example, the housing 10 can include a first portion 11 and a second portion 12, which overlap to define a storage space for the battery cells 20. The first and second portions 11, 12 can have various shapes, such as a rectangular parallelepiped or a cylinder. The first portion 11 can be a hollow structure with one side open, and the second portion 12 can also be a hollow structure with one side open. The open side of the second portion 12 overlaps the open side of the first portion 11, forming the housing 10 with a storage space. Alternatively, the first portion 11 can be a hollow structure with one side open, and the second portion 12 can be a plate-like structure. The second portion 12 overlaps the open side of the first portion 11, forming the housing 10 with a storage space. The first and second portions 11, 12 can be sealed using a sealing element, such as a sealing ring or sealant.

[0064] The battery cell 20 is an energy storage unit that generates an electrochemical reaction between an electrode assembly and an electrolyte to output electrical energy.

[0065] The housing 10 may contain one or more battery cells 20. If there are multiple battery cells 20, they may be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections within the battery cells 20. Multiple battery cells 20 may be connected in series, in parallel, or in a hybrid configuration to form a battery module, which is then connected in series, in parallel, or in a hybrid configuration to form a single unit housed within the housing 10. Alternatively, all battery cells 20 may be directly connected in series, in parallel, or in a hybrid configuration, and then the entire unit formed by all battery cells 20 is housed within the housing 10.

[0066] The battery 100 may further include a busbar 40, through which the multiple battery cells 20 may be electrically connected to each other, thereby enabling series, parallel, or mixed connection of the multiple battery cells 20. The busbar 40 may be a metal conductor, such as copper, iron, aluminum, stainless steel, or aluminum alloy.

[0067] The processing device 30 is a component used to reduce the concentration of a preset gas in the exhaust gas. The processing device 30 can process the exhaust gas to reduce the concentration of the preset gas in various ways, such as by providing a processing medium through the processing device 30 to reduce the concentration of the preset gas. The processing medium can be a solid medium, a liquid medium, or a gaseous medium. The processing medium can be at least one of a phase change material, an oxidant, a mixture of an oxidant and a catalyst, ultrapure water, a fluorinated liquid, and a water-cooled liquid. The oxidant can be at least one of copper oxide, sodium peroxide, or potassium permanganate, and the catalyst can be a precious metal catalyst, such as at least one of palladium, platinum, or rhodium. For example, if the processing medium is a solid phase change material, when the battery cell 20 experiences thermal runaway, causing the temperature inside the housing 10 to rise, the phase change material changes from a solid state to a non-flammable liquid or gaseous medium, thereby reducing the concentration of the preset gas. For another example, if the processing medium is an oxidant, the oxidant chemically reacts with the preset gas, thereby reducing the concentration of the preset gas.

[0068] Exhaust gas is the gas discharged from the interior of a battery cell 20 when the battery cell 20 experiences thermal runaway. The exhaust gas includes combustible and non-combustible gases. Combustible gases include at least one of H2, CO, alkanes, and electrolyte vapor, while non-combustible gases include at least one of CO2 and N2. Alkanes include at least one of CH4, C2H4, and C3H8. The preset gas is a mixture of one or more combustible gases in the exhaust gas. For example, if the combustible gases in the exhaust gas are H2, CO, alkanes, and electrolyte vapor, the concentration of any one of these combustible gases, H2, CO, alkanes, and electrolyte vapor, can be adjusted to a corresponding preset value by the processing device 30. For example, the concentration of hydrogen can be adjusted to below 4%, significantly reducing the risk of combustion after the combustible gas is discharged. Alternatively, the concentration of a mixture of multiple combustible gases, including H2, CO, alkanes, and electrolyte vapor, can be adjusted to a corresponding preset value, similarly reducing the probability of battery fire.

[0069] The preset value can be the lower flammability limit of the preset gas. The lowest concentration that can cause flame propagation is called the lower flammability limit of the preset gas. For example, if the preset gas is electrolyte vapor, the processing device 30 can reduce the concentration of the electrolyte vapor to below the lower flammability limit. For another example, if the preset gas is a mixture of H2, CO, and alkanes, the processing device 30 can reduce the concentration of the mixture of H2, CO, and alkanes to below the lower flammability limit.

[0070] In an embodiment of the present application, a processing device 30 is provided in the box body 10. The processing device 30 can process the exhaust gas discharged into the box body 10 when the battery cell 20 thermally runs away, thereby reducing the concentration of one or more mixed combustible gases in the exhaust gas to below a preset value, reducing the flammability level of the combustible gas, reducing the risk of combustion and explosion of the battery 100, and effectively improving the safety of the battery cell 20.

[0071] In some embodiments, the preset gas is electrolyte vapor, and the preset value is 3.6%.

[0072] The processing device 30 can process the electrolyte vapor in the exhaust gas to reduce the concentration of the electrolyte vapor. Exemplarily, the processing device 30 can reduce the concentration of the electrolyte vapor in the exhaust gas to 1.2% to 3.6%.

[0073] In this embodiment, the concentration of the electrolyte vapor is adjusted to below 3.6% (including 3.6%) by the processing device 30, so that the concentration of the electrolyte vapor is below the lower flammability limit, reducing the risk of electrolyte vapor combustion and improving the safety of the battery cell 20.

[0074] In some embodiments, the preset gas is a combustible gas mixed with H 2 , CO, and alkanes, and the preset value is 7.6%.

[0075] The processing device 30 can process the H2, CO, and alkane mixed combustible gas in the exhaust gas to reduce the concentration of the H2, CO, and alkane mixed combustible gas. Exemplarily, the processing device 30 can reduce the concentration of the H2, CO, and alkane mixed combustible gas in the exhaust gas to 4.4% to 7.6%.

[0076] The concentration of the combustible gas mixed with H2, CO and alkanes is adjusted to below 7.6% (including 7.6%) through the processing device 30, so that the concentration of the combustible gas mixed with H2, CO and alkanes is below the lower combustion limit, reducing the risk of combustion of the combustible gas mixed with H2, CO and alkanes, and improving the safety of the battery cell 20.

[0077] In some embodiments, the preset gas is all combustible gases in the exhaust gas, and the preset value is 8.3%.

[0078] Taking the combustible gas in the exhaust gas as H2, CO, alkane and electrolyte vapor as an example, the processing device 30 can process the combustible gas mixed with H2, CO, alkane and electrolyte vapor in the exhaust gas to reduce the concentration of the combustible gas mixed with H2, CO, alkane and electrolyte vapor.

[0079] Exemplarily, the concentration of the combustible gas mixed with all the combustible gases in the exhaust gas is reduced to 2% to 8.3% by the processing device 30 .

[0080] The concentration of the combustible gas mixed with all combustible gases in the exhaust gas is adjusted to below 8.3% (including 8.3%) by the processing device 30 , thereby reducing the risk of combustion of the exhaust gas and improving the safety of the battery cell 20 .

[0081] In some embodiments, please refer to Figures 3 and 4. Figure 4 is a control principle diagram of the processing device 30 provided in an embodiment of the present application. The battery 100 also includes a detection unit 50 and a control unit 60. The detection unit 50 is disposed in the housing 10, and the detection unit 50 is used to detect the concentration of a preset gas. The control unit 60 is electrically connected to the detection unit 50 and the processing device 30, and the control unit 60 is used to control the processing device 30 to release the processing medium when the concentration of the preset gas in the exhaust gas is higher than the corresponding preset value.

[0082] The detection unit 50 is a component for detecting the concentration of a preset gas. The detection unit 50 can be a device with a concentration sensor or a device with a photoelectric sensor, such as a Raman analyzer. The detection unit 50 is used to detect the concentration of the preset gas. Of course, if the preset gas is a mixture of multiple combustible gases, the detection unit 50 can detect the concentration of each combustible gas and calculate and analyze the concentration of the mixed combustible gas.

[0083] The detection unit 50 is used to control the operation of the treatment device 30 based on the detection results of the detection unit 50. When the concentration of the preset gas exceeds the corresponding preset value, the treatment device 30 releases the treatment medium to reduce the concentration of the preset gas. For example, if the preset gas is all combustible gases in the exhaust gas and the preset value is 8.3%, when the detection unit 50 detects that the concentration of the mixed combustible gas of all combustible gases exceeds 8.3%, the control unit 60 will control the treatment device 30 to release the treatment medium.

[0084] The control unit 60 may be disposed inside the housing 10 or outside the housing 10. The control unit 60 may be a single chip microcomputer or a programmable logic controller (PLC).

[0085] In this embodiment, when the detection unit 50 detects that the preset gas is higher than the corresponding preset value, the control unit 60 controls the processing device 30 to release the processing system to adjust the concentration of the preset gas to below the corresponding preset value, thereby realizing automatic control of the processing device 30.

[0086] Continuing with FIG3 , in some embodiments, the processing device 30 may include a receiving member 31 and a switch unit 32. The receiving member 31 defines a receiving space 311 for accommodating the processing medium. The switch unit 32 is electrically connected to a control unit 60. The control unit 60 is configured to control the switch unit 32 to open when the concentration of a predetermined gas in the exhaust gas exceeds a corresponding predetermined value, thereby releasing the processing medium.

[0087] The receiving component 31 is a component for providing a processing medium, and a receiving space 311 is formed inside the receiving component 31, and the processing medium is received in the receiving space 311. The receiving component 31 can be placed in the box body 10, and can also be fixed in the box body 10.

[0088] The switch unit 32 is a component that connects or disconnects the interior of the housing 10 from the accommodating space 311. The control unit 60 can control the switch unit 32 to open or close. When the switch unit 32 is open, the interior of the housing 10 is connected to the accommodating space 311; when the switch unit 32 is closed, the interior of the housing 10 is disconnected from the accommodating space 311. The switch unit 32 may be an electrically controlled on / off valve.

[0089] In this embodiment, the control unit 60 controls the switch unit 32 to open to release the processing medium contained in the receiving component 31 to process the exhaust gas in the box 10. The overall structure of the processing device 30 is simple.

[0090] In some embodiments, the battery 100 further includes a pressure relief mechanism 70, which is disposed on the housing 10 and is electrically connected to a control unit 60. The control unit 60 is configured to control the activation of the pressure relief mechanism 70 to relieve pressure within the housing 10 when the concentration of a predetermined gas in the exhaust gas is lower than a corresponding predetermined value. The control unit 60 can automatically control the pressure relief mechanism 70 disposed on the housing 10.

[0091] The pressure relief mechanism 70 is a component used to release pressure within the battery cell 20. Under the control of the control unit 60, the pressure relief mechanism 70 can be actuated, allowing exhaust gas within the housing 10 to be discharged to the exterior of the housing 10 through the pressure relief mechanism 70, thereby releasing pressure within the battery cell 20. The pressure relief mechanism 70 can take the form of an explosion-proof valve, an explosion-proof disk, an air valve, a pressure relief valve, or an on-off valve. "Actuation" as used herein refers to the pressure relief mechanism 70 being actuated or activated to a certain state, thereby releasing the internal pressure and temperature of the battery cell 20. The action of the pressure relief mechanism 70 may include, but is not limited to, rupturing, breaking, or tearing at least a portion of the pressure relief mechanism 70. For example, if the pressure relief mechanism 70 is a on-off valve, the control unit 60 can control the pressure relief mechanism 70 to open or close, thereby connecting or disconnecting the interior and exterior of the housing 10.

[0092] When the control unit 60 controls the pressure relief mechanism 70 to be actuated, the control unit 60 may control the pressure relief mechanism 70 to be in a closed state, and the processing device 30 no longer releases the processing medium into the box body 10 .

[0093] When the treatment device 30 releases the treatment medium to adjust the concentration of the preset gas to below the corresponding preset value, the control unit 60 controls the pressure relief mechanism 70 to activate, thereby discharging the exhaust gas inside the housing 10 that meets the exhaust requirements to the outside of the housing 10, thereby reducing the pressure inside the housing 10. Of course, because the concentration of the preset gas discharged outside the housing 10 is below the preset value, it is not easily flammable, thereby ensuring the safety of the battery 100.

[0094] In some embodiments, referring to FIG. 5 , FIG. 5 is a schematic diagram of the structure of the housing 10 shown in FIG. The battery 100 further includes a pressure relief mechanism 70 , which is configured to release pressure within the housing 10 upon activation. The housing 10 includes a first space 13 and a second space 14 , wherein the first space 13 is configured to accommodate the battery cells 20 and the second space 14 is configured to accommodate exhaust gas. The pressure relief mechanism 70 is configured to connect the exterior of the housing 10 and the second space 14 upon activation.

[0095] In this embodiment, the battery 100 may or may not be provided with a detection unit 50 and a control unit 60. If the battery 100 is provided with the detection unit 50 and the control unit 60, the pressure relief mechanism 70 is actively actuated. If the battery 100 is not provided with the detection unit 50 and the control unit 60, the pressure relief mechanism 70 is passively actuated. For example, when the internal pressure of the housing 10 reaches a threshold, the pressure relief mechanism 70 is passively actuated to relieve the pressure within the housing 10.

[0096] In an embodiment where the housing 10 includes a first portion 11 and a second portion 12, the arrangement direction of the first space 13 and the second space 14 can be consistent with the arrangement direction of the first portion 11 and the second portion 12, or the arrangement direction of the first space 13 and the second space 14 can be perpendicular to the arrangement of the first portion 11 and the second portion 12. For example, in FIG5 , the arrangement direction of the first space 13 and the second space 14 can be consistent with the arrangement direction of the first portion 11 and the second portion 12.

[0097] Exemplarily, the volume of the first space 13 is greater than the volume of the second space 14 .

[0098] The first space 13 and the second space 14 of the box body 10 are separated from each other and are used to accommodate the battery cells 20 and exhaust gas respectively, so that the battery cells 20 and the exhaust gas are isolated from each other, reducing the impact of the exhaust gas on the battery cells 20 and further improving safety.

[0099] In some embodiments, referring to FIG. 3 , the battery cell 20 has a pressure relief portion 21 , and the pressure relief portion 21 is disposed toward the second space 14 .

[0100] The pressure relief portion 21 is a component used to release pressure within the battery cell 20. When a battery cell 20 experiences thermal runaway, it will release exhaust gas through the pressure relief portion 21. The pressure relief portion 21 can be a weak area on the outer casing of the battery cell 20 or a pressure relief element provided on the outer casing. The pressure relief element can take the form of an explosion-proof valve, explosion-proof disk, air valve, pressure relief valve, or on / off valve. The outer casing is the component of the battery cell 20 that houses the electrode assembly.

[0101] In this embodiment, the pressure relief portion 21 of the battery cell 20 is disposed toward the second space 14 , so that exhaust gas discharged when the battery cell 20 experiences thermal runaway can more easily enter the second space 14 .

[0102] In some embodiments, referring to FIG. 3 and FIG. 5 , the first space 13 and the second space 14 are separated by a partition 15 . The partition 15 is provided with a channel 151 . The channel 151 connects the first space 13 and the second space 14 .

[0103] The partition 15 is a component that separates the first space 13 from the second space 14. The partition 15 can be a flat plate structure fixed inside the box body 10. In an embodiment where the box body 10 includes a first portion 11 and a second portion 12, the first portion 11 can be disposed at the bottom of the second portion 12, the partition 15 can be fixed within the first portion 11, and the pressure relief mechanism 70 can be disposed in the first portion 11.

[0104] The channels 151 can correspond one to one with the battery cells 20. The channels 151 can extend along a straight line or a non-straight line, for example, along a bend line. For example, in Figures 3 and 5 , the channels 151 are straight lines extending along the thickness of the separator 15 . The channels 151 penetrate both surfaces of the separator 15 along the thickness direction, thereby connecting the first space 13 and the second space 14 .

[0105] Exemplarily, the separator 15 is used to support the battery cells 20 , and the separator 15 is configured as a heat management component for managing the temperature of the battery cells 20 .

[0106] In this embodiment, the first space 13 and the second space 14 are in a communicating state, and exhaust gas discharged when the battery cell 20 experiences thermal runaway can enter the second space 14 through the channel 151 .

[0107] In some embodiments, referring to FIG. 3 , the battery cell 20 has a pressure relief portion 21 . The pressure relief portion 21 is located at one end of the channel 151 along the through direction Y and is disposed toward the channel 151 .

[0108] Taking the channel 151 as a straight channel 151 extending along the thickness direction of the separator 15 as an example, the through direction Y of the channel 151 is the extension direction of the channel 151, which can also be understood as the thickness direction of the separator 15.

[0109] In this embodiment, the pressure relief portion 21 is located at one end of the channel 151 along the through direction Y and is arranged toward the channel 151. The exhaust gas discharged when the battery cell 20 thermally runs away can directly enter the channel 151, so that the exhaust gas enters the second space 14 more quickly.

[0110] In some embodiments, referring to Figures 6 and 7 , Figure 6 is a schematic structural diagram of a battery 100 provided in other embodiments of the present application, and Figure 7 is a partially enlarged view of a portion A of the battery 100 shown in Figure 6 . The processing device 30 includes a separator 15 , which is provided with an inner cavity 152 for accommodating a processing medium. A switch portion 153 is provided on the sidewall of a channel 151 , which is configured to allow the processing medium in the inner cavity 152 to flow out through the switch portion 153 when opened.

[0111] The partition 15 may be a part of the processing device 30 . The partition 15 serves as both a partition component for separating the first space 13 and the second space 14 and a processing component for providing a processing medium.

[0112] Lumen 152 is the interior space of separator 15, used to accommodate the processing medium. Lumen 152 within separator 15 can be one or multiple. Lumens 152 and channels 151 can be arranged in a one-to-one correspondence, meaning that the processing medium in one lumen 152 flows into one channel 151. Alternatively, one lumen 152 can correspond to multiple channels 151, meaning that the processing medium in one lumen 152 flows into multiple channels 151.

[0113] The switch portion 153 is a component used to connect or disconnect the inner cavity 152 and the channel 151 . When the switch portion 153 is opened, the processing medium in the inner cavity 152 flows out into the channel 151 through the switch portion 153 .

[0114] In an embodiment in which the processing device 30 is controlled by the control unit 60 to release the processing medium, the control unit 60 may be electrically connected to the switch portion 153 , and the switch portion 153 may be controlled by the control unit 60 to be opened or closed.

[0115] When the exhaust gas enters the second space 14 through the channel 151 , the processing medium in the inner cavity 152 can be released through the switch portion 153 to more quickly reduce the concentration of the preset gas in the exhaust gas.

[0116] In some embodiments, as shown in FIG. 7 , the switch portion 153 is a nozzle, and a spraying direction X of the nozzle intersects with a penetrating direction Y of the channel 151 .

[0117] The nozzle's spray direction X and the through-direction Y of the channel 151 are not parallel to each other and may be arranged at an angle. The through-direction Y of the channel 151 is consistent with the flow direction of the exhaust gas discharged from the battery cell 20 within the channel 151. In Figure 7, the nozzle's spray direction X is perpendicular to the through-direction Y of the channel 151.

[0118] For example, the nozzle is provided with a switch valve, and the control unit 60 controls the switch valve to open or close the nozzle, so that the processing medium in the inner cavity 152 is ejected through the nozzle.

[0119] In this embodiment, the nozzle's spray direction X intersects the through-direction Y of the channel 151. This allows the treatment medium ejected from the nozzle to more thoroughly mix with the exhaust gas, resulting in a more effective treatment of the exhaust gas and a more rapid reduction in the concentration of the predetermined gas in the exhaust gas. Of course, if the nozzle's spray direction X is perpendicular to the through-direction Y of the channel 151, the exhaust gas treatment effect of the treatment medium ejected from the nozzle can be further enhanced.

[0120] In other embodiments, the switch portion 153 may have other structures. For example, the separator 15 may be provided with a first connecting channel connecting the inner cavity 152 and the channel 151, and the switch portion 153 may close the first connecting channel. The switch portion 153 may be made of a heat-sensitive material. When the temperature reaches the melting point of the switch portion 153, the switch portion 153 partially or completely melts, thereby opening the first connecting channel and further connecting the inner cavity 152 and the channel 151.

[0121] In some embodiments, please refer to FIG8 , which is a schematic diagram of the structure of a battery 100 provided in some other embodiments of the present application. The first space 13 and the second space 14 are separated by a partition 15 , which is provided with a switch mechanism 154 , which is configured to connect or disconnect the first space 13 and the second space 14 .

[0122] The switch mechanism 154 is a component that connects or disconnects the first space 13 and the second space 14. When the switch mechanism 154 is opened, the first space 13 and the second space 14 are in a connected state, and the exhaust gas discharged into the first space 13 by the battery cells 20 can enter the second space 14 through the switch mechanism 154.

[0123] There may be one or more switch mechanisms 154 on the separator 15 . For example, the separator 15 is provided with multiple switch mechanisms 154 , and the switch mechanisms 154 correspond to the battery cells 20 one by one.

[0124] A switch mechanism 154 is provided on the separator 15 to connect or disconnect the first space 13 and the second space 14. Under normal operating conditions, the switch mechanism 154 can be closed, making the first space 13 and the second space 14 independent of each other. When the battery cell 20 experiences thermal runaway, the switch mechanism 154 can be opened, connecting the first space 13 and the second space 14, allowing exhaust gas to flow from the first space 13 into the second space 14.

[0125] In some embodiments, referring to FIG. 8 , the switch mechanism 154 is a weak portion, and the weak portion is configured to be destroyed by the exhaust gas and then connect the first space 13 to the second space 14 .

[0126] The weak portion is a portion of the separator 15 that is thinner than other regions. Under the action of the exhaust gas, the weak portion can be broken, detached, melted, or the like to connect the first space 13 and the second space 14.

[0127] In this embodiment, the switch mechanism 154 can be passively opened under the action of exhaust gas, has a simple structure, and is very economical.

[0128] In other implementations, the switch mechanism 154 may also be other structures, for example, the switch mechanism 154 may be a switch valve provided on the separator 15. In an embodiment where the battery 100 is provided with a control unit 60 for controlling the processing device 30, the switch mechanism 154 may be electrically connected to the control unit 60, and the switch mechanism 154 may be opened or closed by the control unit 60.

[0129] In some embodiments, referring to FIG. 8 , the processing device 30 is disposed in the second space 14 .

[0130] In an embodiment where the processing device 30 includes a receiving component 31 and a switch unit 32 , the control unit 60 , the detection unit 50 , the receiving component 31 and the switch unit 32 may all be disposed in the second space 14 .

[0131] In this embodiment, the processing device 30 is disposed in the second space 14 . After the exhaust gas enters the second space 14 , the processing device 30 can process the exhaust gas in the second space 14 , thereby reducing the concentration of the preset gas in the exhaust gas.

[0132] In some embodiments, please refer to FIG9 , which is a schematic diagram of the structure of a battery 100 provided in some further embodiments of the present application. A battery cell 20 has a pressure relief portion 21 . A processing device 30 includes a support member 33 , which is used to support the battery cell 20 . A relief cavity 331 is provided on the side of the support member 33 facing the battery cell 20 . The relief cavity 331 is used to avoid the pressure relief portion 21 and contains a processing medium.

[0133] The support member 33 is located at the bottom of the battery cell 20 and provides support for the battery cell 20. In the embodiment where a partition 15 is provided in the housing 10 to separate the interior space of the housing 10 into a first space 13 and a second space 14, the partition 15 can serve as the support member 33 to support the battery cell 20.

[0134] The support member 33 may be a plate-like structure, and the escape cavity 331 may be a groove provided on the surface of the support member 33 facing the battery cell 20. In embodiments where there are multiple battery cells 20 within the housing 10, the escape cavity 331 may be shared by multiple battery cells 20, or one escape cavity 331 may be provided for each battery cell 20. For example, in FIG9 , multiple battery cells 20 share one escape cavity 331.

[0135] Exemplarily, the processing medium contained in the avoidance chamber 331 may be a solid phase change material, an oxidant, a mixture of an oxidant and a catalyst, or the like.

[0136] In this embodiment, a processing medium is provided in the avoidance cavity 331 of the pressure relief portion 21 of the support member 33 for avoiding the battery cell 20, and the exhaust gas discharged from the pressure relief portion 21 can flow directly to the processing medium, thereby quickly reducing the concentration of the preset gas in the exhaust gas through the processing medium.

[0137] In some embodiments, please refer to Figures 10 and 11. Figure 10 is an exploded view of the battery cell 20 and the support member 33 provided in some embodiments of the present application; Figure 11 is a structural schematic diagram of the support member 33 shown in Figure 10. The battery cell 20 has a pressure relief portion 21. The processing device 30 includes a support member 33, the support member 33 is used to support the battery cell 20, and the side of the support member 33 facing the battery cell 20 is provided with an avoidance cavity 331, the avoidance cavity 331 is used to avoid the pressure relief portion 21, and the avoidance cavity 331 is provided with a trigger mechanism 332. The interior of the support member 33 is provided with a accommodating cavity, and the accommodating cavity is used to accommodate the processing medium. The trigger mechanism 332 is configured to allow the processing medium in the accommodating cavity to be discharged through the trigger mechanism 332 after being triggered.

[0138] The trigger mechanism 332 can be triggered in various ways. For example, the trigger mechanism 332 can be triggered by exhaust gas emitted when the battery cell 20 experiences thermal runaway. In another example, the trigger mechanism 332 can be triggered by the voltage or current of the battery cell 20. When the voltage or current of the battery cell 20 reaches a threshold, the trigger mechanism 332 is triggered.

[0139] When the battery cell 20 thermally runs away, the exhaust gas inside the battery cell 20 will be discharged into the avoidance chamber 331 through the pressure relief portion 21. Since the trigger mechanism 332 is provided with the avoidance chamber 331, after the trigger mechanism 332 is triggered, the treatment medium discharged through the trigger mechanism 332 can be fully mixed with the exhaust gas located in the avoidance chamber 331, thereby quickly reducing the concentration of the preset gas in the exhaust gas.

[0140] In some embodiments, the trigger mechanism 332 is configured to be triggered by exhaust gas.

[0141] The trigger mechanism 332 can have a variety of structures. For example, the support member 33 serves as the receiving member 31, the trigger mechanism 332 serves as the switch unit 32, the control unit 60 controls the trigger mechanism 332, and the detection unit 50 detects the concentration of the preset gas to trigger the trigger mechanism 332. For another example, a second connecting channel connecting the avoidance chamber 331 and the accommodating chamber is provided on the support member 33, and the trigger mechanism 332 closes the second connecting channel. The trigger mechanism 332 is a heat-sensitive material. When the exhaust gas causes the internal temperature of the box body 10 to reach the melting point of the trigger mechanism 332, the trigger mechanism 332 partially or completely melts, so that the processing medium can be discharged from the trigger mechanism 332 into the avoidance chamber 331. The trigger mechanisms 332 of the above structures are all triggered by the exhaust gas.

[0142] In a normal working environment, the trigger mechanism 332 is in an untriggered state, and the processing medium contained in the containing cavity will not be discharged; when the battery cell 20 is in thermal runaway, the trigger mechanism 332 can be triggered by the exhaust gas discharged by the battery cell 20, so that the processing medium is discharged in time to reduce the concentration of the preset gas in the exhaust gas.

[0143] In some embodiments, support 33 is configured as a thermal management component.

[0144] The thermal management component is used to contain a fluid to regulate the temperature of the battery cells 20. The fluid can be ultrapure water, fluorinated liquid, water-cooled liquid, etc. The thermal management component can be a cooling component to cool the battery cells 20 or a heating component to heat the battery cells 20. A flow channel is provided within the thermal management component for the flow of the fluid. In embodiments where the support member 33 is provided with a receiving cavity for accommodating the processing medium, the flow channel and the receiving cavity are independent of each other and do not communicate with each other.

[0145] In this embodiment, the support member 33 has the ability to manage the temperature of the battery cell 20 and reduce the concentration of a predetermined gas in the exhaust gas.

[0146] The embodiment of the present application further provides an electric device, comprising the battery 100 provided by any of the above embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other if there is no conflict.

[0147] The above embodiments are intended only to illustrate the technical solutions of this application and are not intended to limit this application. Those skilled in the art will appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this application are intended to be within the scope of protection of this application.

Claims

1. A battery comprising: Box; The battery cell and the processing device are contained in the box body. The processing device is used to process the exhaust gas discharged from the battery cell into the box body to adjust the concentration of the preset gas in the exhaust gas to below the corresponding preset value. The preset gas is one or more mixed combustible gases.

2. The battery according to claim 1, wherein The preset gas is electrolyte vapor, and the preset value is 3.6%.

3. The battery according to claim 1, wherein The preset gas is a combustible gas mixed with H2, CO and alkanes, and the preset value is 7.6%.

4. The battery according to claim 1, wherein The preset gas is all the combustible gas in the exhaust gas, and the preset value is 8.3%.

5. The battery according to any one of claims 1 to 4, wherein The battery further comprises: a detection unit, disposed in the box, and configured to detect the concentration of the preset gas; A control unit is electrically connected to the detection unit and the processing device, and the control unit is used to control the processing device to release the processing medium when the concentration of the preset gas is higher than the corresponding preset value.

6. The battery according to claim 5, wherein The processing device comprises: A receiving component having an accommodating space formed therein, the accommodating space being used to accommodate the processing medium; A switch unit is electrically connected to the control unit, and the control unit is used to control the switch unit to open when the concentration of the preset gas is higher than the corresponding preset value to release the processing medium.

7. The battery according to claim 5 or 6, wherein The battery further comprises: a pressure relief mechanism, disposed in the box body, and electrically connected to the control unit; The control unit is used to control the pressure relief mechanism to be actuated when the concentration of the preset gas is lower than a corresponding preset value, so as to release the pressure inside the box.

8. The battery according to any one of claims 1 to 7, wherein: The battery further includes a pressure relief mechanism, which is used to release the pressure inside the box after being actuated; The box body includes a first space and a second space separated from each other. The first space is used to accommodate the battery cell, and the second space is used to accommodate the exhaust gas. The pressure relief mechanism is configured to connect the outside of the box body and the second space after being actuated.

9. The battery according to claim 8, wherein The battery cell has a pressure relief portion, and the pressure relief portion is disposed toward the second space.

10. The battery according to claim 8 or 9, wherein The first space and the second space are separated by a partition. The partition is provided with a channel. The channel connects the first space and the second space.

11. The battery according to claim 10, wherein The battery cell has a pressure relief portion, which is located at one end of the channel along a through direction and is arranged toward the channel.

12. The battery according to claim 11, wherein The processing device includes the partition, which is provided with an inner cavity for accommodating a processing medium. The side wall of the channel is provided with a switch portion, which is configured to allow the processing medium in the inner cavity to be discharged through the switch portion when opened.

13. The battery according to claim 12, wherein The switch portion is a nozzle, and a spraying direction of the nozzle intersects with a penetrating direction of the channel.

14. The battery according to claim 8 or 9, wherein The first space and the second space are separated by a partition. The partition is provided with a switch mechanism configured to connect or disconnect the first space and the second space.

15. The battery according to claim 14, wherein The switch mechanism is a weak portion, and the weak portion is configured to be broken by the exhaust gas to connect the first space and the second space.

16. The battery according to claim 8 or 9, wherein The processing device is arranged in the second space.

17. The battery according to any one of claims 1 to 16, wherein: The battery cell has a pressure relief portion; The processing device includes a support member, the support member is used to support the battery cell, and a relief cavity is provided on a side of the support member facing the battery cell, the relief cavity is used to avoid the pressure relief portion, and the relief cavity contains a processing medium.

18. The battery according to any one of claims 1 to 16, wherein: The battery cell has a pressure relief portion; The processing device includes a support member, the support member is used to support the battery cell, and a side of the support member facing the battery cell is provided with an avoidance cavity, the avoidance cavity is used to avoid the pressure relief portion; The avoidance cavity is provided with a trigger mechanism, and a receiving cavity is provided inside the support member. The receiving cavity is used to receive the processing medium. The trigger mechanism is configured to allow the processing medium in the receiving cavity to be discharged through the trigger mechanism after being triggered.

19. The battery according to claim 18, wherein The trigger mechanism is configured to be triggerable by the exhaust gas.

20. The battery according to any one of claims 17 to 19, wherein The support is configured as a thermal management component.

21. An electrical device comprising the battery according to any one of claims 1 to 20.

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