Battery device and electric equipment

Abstract

The embodiment of the utility model provides a battery device and electric equipment. The battery device comprises a box body and a battery monomer, the box body is provided with a containing cavity and comprises a first wall, the first wall is provided with an airflow channel, an air inlet and an air outlet, the air inlet and the air outlet are communicated with the airflow channel, a plurality of connecting holes distributed at intervals are further formed in the side, facing the containing cavity in the thickness direction of the first wall, of the first wall, and the airflow channel and the containing cavity are communicated through the connecting holes. The battery monomers are arranged in the accommodating cavity; the reliability of the battery device can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, and more particularly, to a battery device and an electric device. BACKGROUND

[0002] With the development of new energy technology, battery devices are applied more and more widely, such as being applied to mobile phones, notebook computers, electric cars, electric vehicles, electric aircrafts, electric ships, electric toy cars, electric toy ships, electric toy aircrafts and electric tools.

[0003] In the development of battery technology, how to improve the reliability of the battery device is a technical problem that needs to be solved in the battery technology. CONTENT OF THE INVENTION

[0004] In view of the above problems, the present application provides a battery device and an electric device, which are beneficial to improve the reliability of the battery device.

[0005] In a first aspect, the present application provides a battery device, comprising: a box body having a containing cavity, the box body comprising a first wall, the first wall having an airflow channel, an air inlet and an air outlet communicated with the airflow channel, and a plurality of spaced-apart connecting holes provided on a side of the first wall facing the containing cavity along a thickness direction of the first wall, the connecting holes communicating the airflow channel with the containing cavity; and a battery monomer arranged in the containing cavity.

[0006] In some embodiments of the first aspect, by providing the first wall having the airflow channel, the air inlet, the air outlet and the connecting holes on the box body, the gas can enter the airflow channel from the air inlet, the gas in the airflow channel can exchange with the high-temperature gas generated by the battery monomer in the containing cavity through the connecting holes, and the gas can be discharged from the air outlet, so as to perform thermal management on the battery monomer, so that the temperature of the battery monomer is maintained within a normal range, which is beneficial to improve the reliability of the battery monomer. In addition, the gas can also form a gas film attached to the surface of the first wall near the side of the first wall facing the containing cavity. When the battery monomer is in thermal runaway and sprays high-temperature and high-speed exhaust, the flowing gas film can effectively isolate the exhaust, thereby reducing the risk of melting the first wall, so as to improve the reliability of the battery device.

[0007] In some embodiments, the battery monomer is provided with a pressure relief mechanism configured to release the internal pressure of the battery monomer, and the first wall is arranged along the thickness direction towards the pressure relief mechanism, and the orthographic projection of the first wall in the thickness direction covers the pressure relief mechanism. By this way of arrangement, the layout is reasonable, which is beneficial to reduce the cost.

[0008] In some embodiments, the pressure relief mechanism is configured to form a pressure relief hole to release the internal pressure of the battery monomer, and the axis direction of the pressure relief hole is parallel to the thickness direction. By this way of arrangement, the layout is reasonable, which can better reduce the possibility of melting the first wall.

[0009] In some embodiments, the area of each connection hole satisfies 0.03mm 2 to 0.28mm 2 . In this way, the battery monomer can be better managed, and the possibility of the first wall being melted through can be reduced.

[0010] In some embodiments, the area of each connection hole satisfies 0.07mm 2 to 0.2mm 2 . In this way, the battery monomer can be better managed, and the possibility of the first wall being melted through can be reduced.

[0011] In some embodiments, the axis direction of the connection hole is arranged to intersect the thickness direction of the first wall. In this way, a dense air film can be formed near the side surface of the first wall facing the accommodation cavity, so as to better protect the first wall.

[0012] In some embodiments, the air flow channel is provided with an air inlet on one side in the first direction and an air outlet on the other side, and the first direction intersects the thickness direction. Such a design can ensure the effectiveness of the air film layer.

[0013] In some embodiments, the area of the connection hole decreases from the air inlet to the air outlet, and / or the spacing between two adjacent connection holes increases from the air inlet to the air outlet. Such a design can help to ensure the effectiveness of the air film formed near the side surface of the first wall facing the accommodation cavity.

[0014] In some embodiments, the length of the first wall in the first direction is greater than the length of the first wall in the second direction, and the second direction intersects the first direction and the thickness direction. In this way, the layout is reasonable, and the gas can flow between the air flow channel and the accommodation cavity through any connection hole.

[0015] In some embodiments, the battery device further comprises a first fan connected to the box body, the first fan is arranged at the air outlet and is configured to provide suction force for the gas in the air flow channel to be discharged from the air outlet; and / or, the battery device further comprises a second fan connected to the box body, the second fan is arranged at the air inlet and is configured to provide driving force for the gas to enter the air flow channel from the air inlet. In this way, the effectiveness of the gas flowing between the air flow channel and the accommodation cavity can be ensured.

[0016] In some embodiments, the battery device further comprises a protective coating, the first wall is provided with the protective coating on a side surface thereof facing the accommodating cavity in the thickness direction, and the protective coating is configured to improve the high-temperature resistance of the first wall. In this way, the possibility of the first wall being melted through can be further reduced.

[0017] In some embodiments, the first wall comprises a first sub-wall and a second sub-wall connected and arranged, the first sub-wall is arranged between the second sub-wall and the accommodating cavity in the thickness direction, and the first sub-wall and the second sub-wall enclose the airflow channel, the air inlet and the air outlet therebetween, and the first sub-wall is provided with the connecting hole. In this way, the processing is facilitated.

[0018] In some embodiments, the first sub-wall and the second sub-wall are detachably connected. In this way, recycling and reuse are facilitated, and cost savings are facilitated.

[0019] In some embodiments, the strength of the second sub-wall is greater than or equal to the strength of the first sub-wall. In this way, the ability of the second sub-wall to resist impact is improved, the service life and reliability of the box body are improved, and the reliability of the battery device is improved.

[0020] In some embodiments, the melting point of the first sub-wall is greater than or equal to the melting point of the second sub-wall, and / or the melting point of the first sub-wall is greater than 1400. In this way, the possibility of the first sub-wall being melted through can be further reduced, thereby protecting the second sub-wall from being melted through, improving the service life and reliability of the box body, and improving the reliability of the battery device.

[0021] In some embodiments, the first sub-wall comprises a main body portion and a connecting portion, the connecting portion is connected to the peripheral side of the main body portion and protrudes from the main body portion toward the second sub-wall, the connecting portion is connected to the second sub-wall, the main body portion is provided with the connecting hole and encloses the airflow channel, the air inlet and the air outlet with the second sub-wall. In this way, the layout is reasonable.

[0022] In some embodiments, the first sub-wall has opposite first and second surfaces in the thickness direction, the first surface has a first opening forming the connecting hole, the second surface has a second opening forming the connecting hole, and the first opening and the second opening are at least partially staggered in the thickness direction. In this way, a dense gas film can be formed near the side surface of the first wall facing the accommodating cavity, thereby better protecting the first wall.

[0023] In a second aspect, the present application provides a power-using device comprising the battery device according to any one of the embodiments of the first aspect, and the battery device is used to store or provide electric energy.

[0024] The above description is only a summary of the technical solutions of the present application. In order to make the technical means of the present application more clearly understood and implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0025] 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 of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of the drawings.

[0026] Figure 1 The structural schematic diagram of a vehicle is provided for some embodiments of the present application;

[0027] Figure 2 The structural schematic diagram of a battery monomer assembly is provided for some embodiments of the present application;

[0028] Figure 3 The exploded structural schematic diagram of a battery monomer is provided for some embodiments of the present application;

[0029] Figure 4 The exploded structural schematic diagram of a battery device is provided for some embodiments of the present application;

[0030] Figure 5 The partial structural schematic diagram of a first wall in a battery device is provided for some embodiments of the present application;

[0031] Figure 6 The partial sectional view of a first sub-wall in a battery device is provided for some embodiments of the present application;

[0032] Figure 7 The partial structural schematic diagram of a first wall in a battery device is provided for some embodiments of the present application.

[0033] The reference signs of the specific embodiments are as follows:

[0034] 1000, vehicle; 1, battery device; 2, controller; 3, motor; 4, battery monomer assembly;

[0035] 100, box body; 101, containing cavity; 110, first box body; 120, second box body;

[0036] 10, first wall; 102, air flow channel; 1021, air inlet; 1022, air outlet; 103, connecting hole;

[0037] 11, first sub-wall; 111, main body portion; 1111, first face; 1101, first opening; 1112, second face; 1102, second opening; 112, connecting portion; 12, second sub-wall;

[0038] 200, battery cell; 21, case; 211, end cap; 212, housing; 22, electrode assembly; 23, electrode terminal; 24, pressure relief mechanism;

[0039] 300, protective coating;

[0040] X, thickness direction; Y, first direction; Z, second direction. DETAILED DESCRIPTION

[0041] In order to make the objects, 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 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.

[0042] 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 present application are only for the purpose of describing 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 non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and 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.

[0043] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase at various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments.

[0044] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mount", "connect", "connect", "attach" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] The term "and / or" in the present application is only used to describe the relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

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

[0047] "Multiple" appearing in the present application means two or more (including two).

[0048] At present, from the development of market situation, the application of battery device is more and more extensive. The battery device is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, as well as military equipment, aerospace and other fields. With the continuous expansion of the application field of battery device, the demand of its market is also increasing.

[0049] In the embodiments of the present application, the battery monomer can be a secondary battery, which refers to a battery monomer that can be activated by charging after discharging.

[0050] The battery monomer can be 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. The embodiments of the present application are not limited thereto.

[0051] A large amount of heat will be generated in the charging and discharging process of the battery monomer. High temperature not only affects the cycle life of the battery monomer, but also may cause thermal runaway of the battery monomer, affecting the normal use of the battery device. Therefore, how to improve the reliability of the battery device is a technical problem to be solved in battery technology.

[0052] Based on the above technical problem, the present application provides a battery device, comprising a box body and a battery monomer. The box body has a containing cavity, and the box body comprises a first wall, the first wall has an air flow channel, an air inlet and an air outlet communicated with the air flow channel, and a plurality of spaced connection holes are arranged on the side of the first wall facing the containing cavity along the thickness direction of the first wall, and the connection holes communicate the air flow channel and the containing cavity. The battery monomer is arranged in the containing cavity.

[0053] The gas can enter the airflow channel from the air inlet, the gas in the airflow channel can exchange with the high-temperature gas generated by the battery monomer in the containing cavity through the connecting hole, and the gas can be discharged from the air outlet, so as to heat manage the battery monomer, keep the temperature of the battery monomer in a normal range, reduce the probability of thermal runaway of the battery monomer, and improve the reliability of the battery monomer, thereby improving the reliability of the battery device.

[0054] The technical solutions described in the embodiments of the present application are suitable for various electric equipment using battery devices, for example, mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc., for example, the spacecraft includes airplanes, rockets, space shuttles and spaceships, etc.

[0055] It should be understood that the technical solutions described in the embodiments of the present application are not only limited to the above-described devices, but can also be applied to all devices using battery devices, but for the sake of brevity, the following embodiments are described by taking electric vehicles as an example.

[0056] For example, as shown in Figure 1 , Figure 1 A structural schematic diagram of a vehicle 1000 according to an embodiment of the present application, the vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric vehicle, a hybrid electric vehicle or a range extended vehicle, etc. The vehicle 1000 can be provided with a motor 3, a controller 2 and a battery device 1 inside, and the controller 2 is used to control the battery device 1 to supply power to the motor 3. For example, the battery device 1 can be arranged at the bottom, the front or the rear of the vehicle 1000. The battery device 1 can be used for power supply of the vehicle 1000, for example, the battery device 1 can be used as an operating power source of the vehicle 1000, and is used for circuit systems of the vehicle 1000, for example, for the working power demand of the vehicle 1000 during starting, navigation and running. In another embodiment of the present application, the battery device 1 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0057] Please refer to Figure 2 and Figure 3 The battery device 1 (Battery Apparatus) mentioned in the embodiments of the present application can include one or more battery monomer assemblies 4 for providing voltage and capacity. The battery monomer assembly 4 (Battery Cell Assembly) can include a plurality of battery monomers 200, and the plurality of battery monomers 200 are connected in series, in parallel or in a mixed connection mode through a busbar component.

[0058] In some embodiments, the battery cell assembly 4 is generally formed by arranging a plurality of battery cells 200.

[0059] As an example, the battery cell assembly 4 can be a battery module, which is formed by arranging and fixing a plurality of battery cells 200 into a single module. As an example, the battery module can be formed by bundling a plurality of battery cells 200 with a cable tie.

[0060] Referring to Figure 3 The battery cell 200 includes a case 21, an electrode assembly 22, and an electrode terminal 23.

[0061] The case 21 is a component for forming an internal environment of the battery cell 200, and the internal environment formed by the case 21 can be used to accommodate the electrode assembly 22, and can also be used to accommodate an electrolyte and other components. Optionally, the case 21 can be, but is not limited to, made of a metal or a non-metal material, for example, the metal material can be copper, aluminum, or stainless steel, etc., and the non-metal material can be polyethylene, polypropylene, or polyvinyl chloride, etc.

[0062] For example, the case 21 can be a steel case, an aluminum case, a plastic case (such as polypropylene), a composite metal case (such as a copper-aluminum composite case), or an aluminum-plastic film, etc.

[0063] In some embodiments, the case 21 can be a sealed structure, or can also be a non-sealed structure. As an example, when the case 21 is a non-sealed structure, the case 21 plays a role of protecting the electrode assembly 22, and a sealing bag is further included between the case 21 and the electrode assembly 22, which is used to package the electrode assembly 22 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film. When the case 21 is a sealed structure, it is used to package the electrode assembly 22, the electrolyte, and other components.

[0064] In some embodiments, the case 21 includes an end cover 211 and a shell 212, and the shell 212 is provided with an opening, and the end cover 211 is provided on the opening. The shell 212 can be provided with one or more openings. The end cover 211 can also be provided with one or more openings.

[0065] The shape of the case 21 can be determined according to the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 is a cuboid structure, a cuboid case can be selected; if the electrode assembly 22 is a cylindrical structure, a cylindrical case can be selected.

[0066] The electrode assembly 22 is a component in which an electrochemical reaction occurs in the battery cell 200, and the case 21 can contain one or more electrode assemblies 22.

[0067] In some embodiments, the shape of the electrode assembly 22 can be cylindrical, flat, or multi-prismatic, etc.

[0068] The electrode assembly 22 can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0069] The electrode assembly 22 includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the negative and positive electrodes. During the charging and discharging process of the battery cell 200, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, serves to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0070] In some embodiments, at least one electrode terminal 23 is provided on the housing 21, and the electrode terminal 23 is electrically connected to the tab of the electrode assembly 22. The electrode terminal 23 can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector.

[0071] Electrode terminal 23 can be electrically connected to electrode assembly 22 for outputting or inputting electrical energy into battery cell 200. Electrode terminal 23 can be electrically connected to electrode assembly 22 by connecting to tabs. The tabs electrically connected to electrode terminal 23 can be either positive or negative tabs.

[0072] In this application, the battery cell 200 may include, but is not limited to, one of a lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell.

[0073] As an example, the battery cell 200 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0074] like Figure 4 As shown, in some embodiments, the battery device 1 may be a battery pack, which includes a housing 100 and one or more battery cell assemblies 4, the battery cell assemblies 4 being housed in the housing 100.

[0075] As an example, the battery cell assembly 4 can be a battery module, and the battery cell assembly 4 can be housed in the housing 100 by fixing the battery module in the housing 100.

[0076] As an example, the battery cell assembly 4 can also be housed in the housing 100 by directly fixing multiple battery cells 200 to the housing 100.

[0077] As an example, the box 100 can include a first box 110 and a second box 120. The first box 110 and the second box 120 are fastened to form the accommodation cavity 101, so that the inside of the box 100 forms a closed space to accommodate the battery monomer assembly 4. The closed here means covered or closed, which can be sealed or unsealed. The first box 110 can be a top cover or a bottom plate.

[0078] As an example, the box 100 can include a top cover, a frame and a bottom plate. The top cover and the bottom plate are connected with the frame respectively, so that the inside of the box 100 forms a closed space to accommodate the battery monomer assembly 4.

[0079] In some embodiments, the box 100 can be part of the chassis structure of the vehicle 1000. For example, part of the box 100 can be at least part of the floor of the vehicle 1000, or part of the box 100 can be at least part of the cross beam and the longitudinal beam of the vehicle 1000.

[0080] Please refer to Figure 4 and Figure 5 According to the embodiments of the present application, a battery device 1 is provided, which includes a box 100 and a battery monomer 200. The box 100 has an accommodation cavity 101, and the box 100 includes a first wall 10, the first wall 10 has an air flow channel 102, an air inlet 1021 and an air outlet 1022 which communicate with the air flow channel 102, and the first wall 10 further has a plurality of spaced connection holes 103 which communicate the air flow channel 102 with the accommodation cavity 101. The battery monomer 200 is arranged in the accommodation cavity 101.

[0081] The box 100 is used to accommodate and protect the battery monomer 200, and the box 100 includes the first wall 10 which can form the accommodation cavity 101. Of course, the box 100 can also include a wall part which forms the accommodation cavity 101, and the first wall 10 can be only part of the wall part.

[0082] The first wall 10 is used to protect the battery monomer 200 in the accommodation cavity 101, and the first wall 10 further has the air flow channel 102 and the air inlet 1021 and the air outlet 1022 which communicate with the air flow channel 102. The gas can enter the air flow channel 102 through the air inlet 1021, and the gas in the air flow channel 102 can be discharged through the air outlet 1022. In this process, the gas in the air flow channel 102 can exchange with the high-temperature gas in the accommodation cavity 101 through the connection holes 103, so as to take away the heat generated by the battery monomer 200, thereby achieving the heat management of the battery monomer 200.

[0083] The first wall 10 can be located above the containing cavity 101. Specifically, as the battery monomer 200 continues to circulate, the temperature inside the containing cavity 101 rises, and the hot air inside the containing cavity 101 naturally rises, reducing the air pressure on the side of the containing cavity 101 facing the first wall 10. Under the action of the pressure difference, the gas in the airflow channel 102 is sucked into the containing cavity 101 through the connecting hole 103. The low-temperature gas can carry away the heat generated during the charging and discharging process of the battery monomer 200, thereby solving the heat dissipation problem of the battery monomer 200 under normal use conditions.

[0084] By this way of heat management of the battery monomer 200, the possibility of thermal runaway of the battery monomer 200 can be reduced, and the structure is simple and the cost is low. In addition, the gas does not directly act on the battery monomer 200, which is beneficial to improve the reliability of the battery monomer 200.

[0085] When the battery monomer undergoes a thermal runaway process, it will react violently inside and eject high-temperature and high-speed gas, particles and other emissions, causing the box to be melted through, which will further cause serious harm to passengers. The related technology adds a mica sheet inside the box to form a thermal protection inside the box, but the upper limit of the heat resistance of the mica sheet is about 1000, and a large amount of high-temperature gas and particles will still melt it after the battery monomer loses control.

[0086] Therefore, the embodiment of the present application sets the first wall 10 with the airflow channel 102, the air inlet 1021, the air outlet 1022 and the connecting hole 103 on the box 100, so that the gas not only flows in the airflow channel 102, but also flows between the airflow channel 102 and the containing cavity 101 through the connecting hole 103. Although the high-temperature gas in the containing cavity 101 will suck the gas in the airflow channel 102 into the containing cavity 101, due to the continuous upwelling of the high-temperature gas, the gas flowing below the connecting hole 103 on the side surface of the first wall 10 facing the containing cavity 101 will form a gas film. When the battery monomer 200 undergoes thermal runaway and ejects high-temperature and high-speed emissions, the flowing gas film can effectively isolate the emissions and reduce the risk of the first wall 10 being melted through.

[0087] The gas film can be understood as a gas film layer flowing on the side surface of the first wall 10 facing the containing cavity 101, which can alleviate or resist the impact force of the high-temperature emissions and reduce the temperature and impact force of the emissions impacting on the first wall 10.

[0088] The battery device 1 provided by some embodiments of the present application can be applied to normal use conditions of the battery monomer 200 to solve the heat dissipation problem in the charging and discharging process of the battery monomer 200, keep the temperature of the battery monomer 200 within a normal range, reduce the possibility of thermal runaway of the battery monomer 200, and improve the service life of the battery monomer 200. In addition, the battery device 1 can also be applied to the failure condition of the battery monomer 200 when thermal runaway occurs to solve the protection problem of the box body 100 and improve the reliability of the battery device 1.

[0089] The first wall 10 can be a top wall of the box body 100 located on the upper side of the battery monomer 200, or a bottom wall of the box body 100 located on the lower side of the battery monomer 200, or a side wall located on one side of the battery monomer 200. Of course, the first wall 10 can also be a wall of the box body 100 located at other positions. Exemplarily, the first wall 10 can be at least a part of the first box body 110 or at least a part of the second box body 120.

[0090] As shown in Figure 4 The first box body 110 is a top cover and is entirely provided as the first wall 10.

[0091] In the present application, one of the thickness directions X of the first wall 10 can be parallel to the height direction of the box body 100, the first direction Y can be the length direction of the box body 100, and the second direction Z can be the width direction of the box body 100.

[0092] The shape of the first wall 10 is not limited in the present embodiment. Exemplarily, the first wall 10 can be in the shape of a flat plate, a curved plate, or other shapes.

[0093] The first wall 10 can be an integral structure or a composite structure assembled by multiple sub-components.

[0094] Optionally, the first wall 10 can be made of a material with a melting point greater than 1000℃, and the material can include but is not limited to stainless steel.

[0095] Optionally, the plurality of connecting holes 103 can be uniformly distributed, that is, the spacing between every two adjacent connecting holes 103 is the same, and of course, the plurality of connecting holes 103 can also be arranged according to certain rules.

[0096] In some embodiments, the side surface of the first wall 10 along the thickness direction X away from the containing cavity 101 can be provided with an air inlet 1021 and / or an air outlet 1022.

[0097] In some embodiments, one side of the first wall 10 along the first direction Y can be provided with an air inlet 1021 and / or an air outlet 1022.

[0098] In some embodiments, the first wall 10 can be provided with an air inlet 1021 and / or an air outlet 1022 on one side along the second direction Z.

[0099] Referring to Figure 3 and Figure 4 In some alternative embodiments, the battery cell 200 is provided with a pressure relief mechanism 24 configured to release the internal pressure of the battery cell 200, the first wall 10 is arranged along the thickness direction X towards the pressure relief mechanism 24, and the orthographic projection of the first wall 10 on the thickness direction X covers the pressure relief mechanism 24.

[0100] The thickness direction X can be understood as the height direction of the battery box 100, which is perpendicular to the first direction Y and the second direction Z respectively. Specifically, the pressure relief mechanism 24 can be arranged at an upper position of the battery cell 200 along the height direction, i.e., on the shell 21 of the battery cell 200, and the first wall 10 is arranged at an upper position of the pressure relief mechanism 24 along the height direction. Alternatively, the pressure relief mechanism 24 is arranged on the end cover 211.

[0101] The "orthographic projection of the first wall 10 on the thickness direction X covers the pressure relief mechanism 24" means that the orthographic projection of the pressure relief mechanism 24 on the thickness direction X is located within the orthographic projection of the first wall 10 on the thickness direction X. The area of the orthographic projection of the first wall 10 on the thickness direction X can be greater than or equal to the area of the orthographic projection of the pressure relief mechanism 24 on the thickness direction X.

[0102] The first wall 10 can be located entirely on one side of the pressure relief mechanism 24 along the thickness direction X, or only partially on one side of the pressure relief mechanism 24 along the thickness direction X. For example, the first wall 10 and the pressure relief mechanism 24 are arranged along the thickness direction X, and at least part of the first wall 10 is located on one side of the pressure relief mechanism 24 along the thickness direction X.

[0103] The battery cell 200 can be one or multiple. For example, the battery cell 200 is multiple. Alternatively, the pressure relief mechanism 24 of each battery cell 200 faces the first wall 10.

[0104] The pressure relief mechanism 24 is used to release the internal pressure of the battery cell 200, i.e., the pressure relief mechanism 24 can discharge the internal gas of the battery cell 200.

[0105] As an example, the internal pressure or temperature of the battery cell 200 reaches a predetermined threshold value, and the pressure relief mechanism 24 is actuated to release the internal pressure or temperature. When the internal pressure or temperature of the battery cell 200 reaches the predetermined threshold value, the pressure relief mechanism 24 performs an action or a weak structure provided in the pressure relief mechanism 24 is broken, thereby forming an opening or a passage for the internal pressure or temperature to be released. The threshold value is designed differently according to design requirements. The threshold value can depend on the material of one or more of the positive plate, the negative plate, the electrolyte, and the separator in the battery cell 200.

[0106] As an example, the pressure relief mechanism 24 can be integrally formed with the shell 21.

[0107] As an example, the pressure relief mechanism 24 can also be provided separately from the shell 21 and connected.

[0108] The "actuation" mentioned in the present application refers to the pressure relief mechanism 24 generating an action or being activated to a certain state, so that the internal pressure and temperature of the battery cell 200 can be released. The action generated by the pressure relief mechanism 24 can include but is not limited to: the movement of a component in the pressure relief mechanism 24 forming an exhaust passage, at least a part of the pressure relief mechanism 24 being broken, crushed, torn or opened, etc. When the pressure relief mechanism 24 is actuated, the high-temperature and high-pressure substances inside the battery cell 200 will be discharged outward from the actuated part as exhaust. In this way, the battery cell 200 can be released and cooled under controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0109] In some embodiments, when the shell 21 is a non-sealed structure, the pressure relief mechanism 24 can be provided as a through hole for discharging the gas inside the battery cell 200.

[0110] The exhaust from the battery cell 200 mentioned in the present application includes but is not limited to: electrolyte, dissolved or split positive and negative plates, fragments of separators, high-temperature and high-pressure gases generated by reactions, flames, etc.

[0111] The battery device 1 provided by some embodiments of the present application is configured by arranging the first wall 10 close to and covering the pressure relief mechanism 24. When the battery cell 200 is in thermal runaway, the high-temperature and high-pressure exhaust released by the pressure relief mechanism 24 will directly impact the first wall 10. Since the side surface of the first wall 10 facing the pressure relief mechanism 24 is provided with a gas film layer, the gas film layer can reduce the temperature of the exhaust, thereby reducing the impact force of the exhaust on the first wall 10, playing a buffering role, thereby reducing the possibility of the first wall 10 being melted through, improving the protection effect on the box body 100, and thus improving the reliability of the battery device 1.

[0112] In addition, this arrangement is reasonable in layout, and only the first wall 10 needs to be arranged on the side facing the pressure relief mechanism 24, which is conducive to reducing costs.

[0113] In some alternative embodiments, the pressure relief mechanism 24 is configured to form a pressure relief hole to release the internal pressure of the battery cell 200, and the axis direction of the pressure relief hole is parallel to the thickness direction X.

[0114] When the pressure relief mechanism 24 is actuated and forms the pressure relief hole, the first wall 10 can cover the pressure relief hole in the thickness direction X.

[0115] In this way, the layout of the pressure relief mechanism 24 and the first wall 10 is more reasonable, which is conducive to reducing the risk of the first wall 10 being melted through, thereby improving the reliability of the battery device 1.

[0116] In some alternative embodiments, the first wall 10 is a flat plate structure.

[0117] For example, the first wall 10 can be a flat plate with uniform thickness, or a plate with non-uniform thickness.

[0118] In some alternative embodiments, the area of each connection hole 103 is between 0.03mm 2 and 0.28mm 2 .

[0119] The "area of the connection hole 103" refers to the cross-sectional area of the connection hole 103, which can also be understood as the area of the connection hole 103 penetrating the first wall 10 to form an opening on the first wall 10.

[0120] The area of the connection hole 103 is related to the rate and flow of gas exchange between the gas flow channel 102 and the containing cavity 101. If the area of each connection hole 103 is designed to be too small, i.e., less than 0.03mm 2 , it may affect the heat management effect of the battery cell 200 and fail to dissipate heat from the battery cell 200 in time; and if the area of each connection hole 103 is designed to be too large, i.e., less than 0.28mm 2 , it may cause the gas to flow too fast and fail to form a gas film layer on the side surface of the first wall 10 facing the containing cavity 101, which fails to buffer the high-temperature and high-speed exhaust, and causes the first wall 10 to be melted through.

[0121] Therefore, by setting the area of the connection hole 103 to be between 0.03mm 2 and 0.28mm 2 , and including the two endpoint values 0.03mm 2 and 0.28mm 2 , the battery cell 200 can be better managed, and the risk of the first wall 10 being melted through can be reduced, thereby better improving the reliability of the battery device 1.

[0122] Optionally, the connecting hole 103 is a circular hole, and a radius of the connecting hole 103 is between 0.1 mm and 0.3 mm.

[0123] Further, an area of each connecting hole 103 is between 0.07 mm 2 and 0.2 mm 2 .

[0124] In this way, the battery monomer 200 can be further better managed, and the possibility of the first wall 10 being melted through can be further reduced.

[0125] Optionally, the connecting hole 103 is a circular hole, and a radius of the connecting hole 103 is between 0.15 mm and 0.25 mm.

[0126] For example, the radius of the connecting hole 103 can be 0.2 mm.

[0127] The area of each connecting hole 103 can be the same, or can be different.

[0128] Referring to Figure 6 , in some optional embodiments, an axis direction of the connecting hole 103 intersects with the thickness direction X of the first wall 10.

[0129] The "axis of the connecting hole 103" can be understood as the central axis or center line of the connecting hole 103, that is, the point formed by the axis on the cross section of the connecting hole 103 is located at the center of the cross section.

[0130] The "axis direction of the connecting hole 103 intersects with the thickness direction X of the first wall 10" means that the connecting hole 103 can be provided as an inclined hole structure. The inclined connecting hole 103 can have a larger hole volume at the same height, that is, at the height of the first wall 10 along the thickness direction X, which is beneficial to improve the heat exchange effect of the battery monomer 200.

[0131] The battery device 1 provided by some embodiments of the present application is beneficial to form a dense gas film on the side surface of the first wall 10 facing the accommodating cavity 101 by providing the connecting hole 103 as an inclined hole structure, so as to better play a protective role on the first wall 10, that is, on the box body 100.

[0132] As Figure 4 shown, in some optional embodiments, the air flow channel 102 is provided with an air inlet 1021 on one side along the first direction Y and an air outlet 1022 on the other side, and the first direction Y intersects with the thickness direction X.

[0133] That is, the air inlet 1021 is located at one side of the airflow passage 102 along the first direction Y, and the air outlet 1022 is located at the other side of the airflow passage 102 along the first direction Y, in this way, the gas in the airflow passage 102 can have sufficient time to exchange heat with the high-temperature gas in the containing cavity 101, and the flowing gas can also ensure the effectiveness of forming the gas film layer at the bottom of the first wall 10, thereby improving the reliability of the battery device 1.

[0134] In some optional embodiments, the area of the connecting hole 103 decreases from the air inlet 1021 to the air outlet 1022.

[0135] It can be understood that the gas near the air outlet 1022 is discharged faster from the air outlet 1022, and therefore, by arranging in the above manner, the speed of discharging the gas near the air outlet 1022 can be reduced, so that the gas can flow between the airflow passage 102 and the containing cavity 101 through the connecting hole 103 near the air outlet 1022, so as to improve the uniformity of forming the gas film layer, and better protect the first wall 10.

[0136] In some optional embodiments, the spacing between two adjacent connecting holes 103 increases from the air inlet 1021 to the air outlet 1022.

[0137] By arranging in the above manner, the speed of discharging the gas near the air outlet 1022 can also be reduced, so that the gas can flow between the airflow passage 102 and the containing cavity 101 through the connecting hole 103 near the air outlet 1022, so as to improve the uniformity of forming the gas film layer, and better protect the first wall 10.

[0138] Optionally, the area of the connecting hole 103 decreases from the air inlet 1021 to the air outlet 1022, and the spacing between two adjacent connecting holes 103 increases from the air inlet 1021 to the air outlet 1022.

[0139] As shown in FIG. 1, Figure 4 In some embodiments, the length of the first wall 10 in the first direction Y is greater than the length of the first wall 10 in the second direction Z, and the second direction Z intersects the first direction Y and the thickness direction X.

[0140] By arranging the air inlet 1021 and the air outlet 1022 on the two sides of the first wall 10 with longer length, the effectiveness of the gas flowing between the airflow passage 102 and the containing cavity 101 through any connecting hole 103 can be improved, the layout is more reasonable, and the heat dissipation effect on the battery monomer 200 can also be improved.

[0141] In some alternative embodiments, the battery device 1 further comprises a first fan connected with the box body 100, the first fan is arranged at the air outlet 1022 and is configured to provide suction force for the gas in the air flow channel 102 to be discharged from the air outlet 1022.

[0142] The first fan is configured to suck the gas in the air flow channel 102 and discharge it from the air outlet 1022, so as to realize the flow of the gas in the air flow channel 102.

[0143] The first fan can include but is not limited to a suction fan, a fan or the like.

[0144] The first fan can be arranged to cover the air outlet 1022, so as to ensure the sealing requirement of the air flow channel 102 with the outside.

[0145] In some alternative embodiments, the battery device 1 further comprises a second fan connected with the box body 100, the second fan is arranged at the air inlet 1021 and is configured to provide driving force for the gas to enter the air flow channel 102 from the air inlet 1021.

[0146] The second fan is configured to make the outside gas enter the air flow channel 102 from the air inlet 1021.

[0147] The second fan can include but is not limited to an air inlet fan, a fan or the like.

[0148] The second fan can be arranged to cover the air inlet 1021, so as to ensure the sealing requirement of the air flow channel 102 with the outside.

[0149] In some embodiments, the battery device 1 can only comprise the first fan.

[0150] In some other embodiments, the battery device 1 comprises both the first fan and the second fan, and the first fan and the second fan are arranged oppositely along the first direction Y.

[0151] Please refer to Figure 7 In some embodiments, the battery device 1 further comprises a protective coating 300, the first wall 10 is provided with the protective coating 300 on one side surface thereof along the thickness direction X towards the accommodating cavity 101, and the protective coating 300 is configured to improve the high-temperature resistance of the first wall 10.

[0152] When the battery monomer 200 occurs thermal runaway, the protective coating 300 can enhance the ability of the first wall 10 to resist the high-temperature and high-speed discharge of the battery monomer 200, further reduce the risk of the first wall 10 being melted through, and further improve the reliability of the box body 100, thereby further improving the reliability of the battery device 1.

[0153] Optionally, the protective coating 300 can be coated on the first wall 10 by a spraying process.

[0154] Optionally, the protective coating 300 can include, but is not limited to, a ceramic matrix composite coating, a polysilazane coating, etc.

[0155] Please refer to Figures 4 to 7 In some embodiments, the first wall 10 includes a first sub-wall 11 and a second sub-wall 12 connected and arranged, the first sub-wall 11 is arranged between the second sub-wall 12 and the accommodation cavity 101 along the thickness direction X, and the first sub-wall 11 and the second sub-wall 12 enclose the air flow channel 102, the air inlet 1021 and the air outlet 1022, and the first sub-wall 11 is provided with the connecting hole 103.

[0156] Optionally, the first sub-wall 11 and the second sub-wall 12 can be connected by adhesion, welding, fastener connection or clamping connection.

[0157] For example, the first sub-wall 11 and the second sub-wall 12 can be fixed by bolt connection.

[0158] The materials of the first sub-wall 11 and the second sub-wall 12 can be the same or different.

[0159] Optionally, the first sub-wall 11 can be made of stainless steel, and the second sub-wall 12 can be made of stainless steel.

[0160] The number of the first sub-wall 11 can be one or more, that is, the number of the air flow channel 102 can be one or more.

[0161] One of the first sub-wall 11 and the second sub-wall 12 can be arranged as a flat plate structure, so as to form a composite structure with the other to enclose the air flow channel 102.

[0162] Optionally, the second sub-wall 12 is arranged as a flat plate structure. The second sub-wall 12 can be a flat plate with uniform thickness or a plate with non-uniform thickness.

[0163] The first fan and the second fan can be connected to the second sub-wall 12. Optionally, the first sub-wall 11 is connected with the first fan on one side along the first direction Y, and connected with the second fan on the other side.

[0164] Optionally, the second sub-wall 12 is provided with a protective coating 300 on the surface away from the first sub-wall 11 along the thickness direction X, and the protective coating 300 is used to improve the high temperature resistance of the second sub-wall 12.

[0165] The battery device 1 provided by some embodiments of the present application has the advantages that the first wall 10 is arranged as a composite structure including the first sub-wall 11 and the second sub-wall 12, which is convenient for processing and manufacturing and is beneficial to reduce the manufacturing difficulty.

[0166] In some embodiments, the first sub-wall 11 and the second sub-wall 12 are detachably connected.

[0167] In this way, recycling and reuse are facilitated, thereby saving costs.

[0168] In some embodiments, the first sub-wall 11 and the second sub-wall 12 are made of different materials.

[0169] The first sub-wall 11 and the second sub-wall 12 can be made of different materials, which can combine the characteristics of different materials to produce a first wall 10 with better thermal shock resistance. In addition, compared to the first sub-wall 11 and the second sub-wall 12 made of the same material, the first sub-wall 11 and the second sub-wall 12 made of different materials can make the structure of the first wall 10 more variable, thereby improving the flexibility of use.

[0170] In some embodiments, the strength of the second sub-wall 12 is greater than or equal to the strength of the first sub-wall 11.

[0171] The strength of the second sub-wall 12 can be greater than or equal to the strength of the first sub-wall 11.

[0172] In this way, the possibility of damage to the second sub-wall 12 is reduced. During operation of the battery device 1, the second sub-wall 12 is in contact with the external environment. When the battery device 1 is jolted or impacted, the second sub-wall 12 can resist external impact to improve the protection effect on the battery monomer 200, thereby improving the service life and reliability of the box body 100, and thus improving the reliability of the battery device 1.

[0173] In some embodiments, the melting point of the first sub-wall 11 is greater than or equal to the melting point of the second sub-wall 12.

[0174] The melting point of the first sub-wall 11 can be greater than or equal to the melting point of the second sub-wall 12.

[0175] In this way, the possibility of the first sub-wall 11 being melted through is reduced, thereby reducing the possibility of the second sub-wall 12 being melted through, preventing damage to the second sub-wall 12, and preventing the discharge in the box body 100 from breaking through the second sub-wall 12 to cause safety hazards to external personnel.

[0176] That is, the thermal shock resistance of the first sub-wall 11 is greater than or equal to the thermal shock resistance of the second sub-wall 12. Thermal shock resistance refers to the ability of a material to withstand rapid changes in temperature without being damaged. In other words, when subjected to the same high-temperature high-speed impact, the first sub-wall 11 is less likely to be damaged than the second sub-wall 12.

[0177] The first sub-wall 11 has better thermal shock resistance than the second sub-wall 12, thereby playing a thermal protection function and reducing the risk of damage to the second sub-wall 12

[0178] In some embodiments, the first sub-wall 11 has a melting point greater than 1400.

[0179] The first sub-wall 11 has a high melting point and is not easy to melt when subjected to thermal shock, thereby reducing the risk of the first sub-wall 11 being punched through.

[0180] In some embodiments, the first sub-wall 11 has a melting point greater than 1400.

[0181] In some embodiments, the protective member 30 has a melting point greater than 1500

[0182] As shown in Figure 7 In some alternative embodiments, the first sub-wall 11 includes a main body portion 111 and a connecting portion 112, the connecting portion 112 is connected to the peripheral side of the main body portion 111 and protrudes from the main body portion 111 toward the second sub-wall 12, the connecting portion 112 is connected to the second sub-wall 12, the main body portion 111 is provided with a connecting hole 103 and forms an airflow passage 102, an air inlet 1021 and an air outlet 1022 together with the second sub-wall 12.

[0183] By the above arrangement, the first sub-wall 11 and the second sub-wall 12 are facilitated to be assembled.

[0184] Alternatively, the number of connecting portions 112 can be two, the two connecting portions 112 are oppositely arranged along the third direction Z, and the two connecting portions 112 have the airflow passage 102, the air inlet 1021 and the air outlet 1022 therebetween.

[0185] Alternatively, the connecting portion 112 and the main body portion 111 can be an integrated structure, which facilitates to improve the processing efficiency, of course, they can also be provided separately to reduce the processing difficulty.

[0186] Illustratively, the main body portion 111 and the second sub-wall 12 are both provided as flat plate structures, and the main body portion 111 and the second sub-wall 12 are arranged in parallel.

[0187] As shown in Figure 6 In some embodiments, the first sub-wall 11 has opposite first and second faces 1111 and 1112 along the thickness direction X, the first face 1111 has a first opening 1101 forming the connecting hole 103, the second face 1112 has a second opening 1102 forming the connecting hole 103, and the first opening 1101 and the second opening 1102 are at least partially offset in the thickness direction X.

[0188] The first surface 1111 is arranged towards the second sub-wall 12, and the second surface 1112 is arranged towards the accommodating cavity 101.

[0189] The first opening 1101 and the second opening 1102 are arranged at least partially staggered in the thickness direction X. This means that the orthographic projection of the first opening 1101 in the thickness direction X and the orthographic projection of the second opening 1102 in the thickness direction X can be completely overlapped or partially overlapped.

[0190] In this way, the connecting hole 103 can be designed as an inclined hole, which is beneficial to form a dense air film on the side surface of the first wall 10 facing the accommodating cavity 101, so as to better play a protective role on the first wall 10, that is, on the box 100.

[0191] The areas of the first opening 1101 and the second opening 1102 can be the same or different.

[0192] Optionally, the areas of the first opening 1101 and the second opening 1102 are the same, which is convenient for processing.

[0193] In some embodiments, the connecting hole 103 can be arranged as an inclined hole as shown in Figure 6 In other embodiments, the connecting hole 103 can also be arranged as a stepped inclined hole, that is, the side wall of the connecting hole 103 is stepped.

[0194] In a second aspect, the present application provides a battery device 1, which is used for storing or providing electric energy.

[0195] Please refer to Figures 4 to 7 The battery device 1 provided by the embodiments of the present application includes a box 100, a battery monomer 200, a first fan, a second fan, and a protective coating 300.

[0196] The box 100 has a containing cavity 101 and comprises a first wall 10, the first wall 10 is a flat plate structure, the length dimension of the first wall 10 in the first direction Y is greater than the length dimension of the first wall 10 in the second direction Z, the first wall 10 comprises a first sub-wall 11 and a second sub-wall 12 which are detachably connected, the first sub-wall 11 is arranged between the second sub-wall 12 and the containing cavity 101 along the thickness direction X, the first sub-wall 11 comprises a main body part 111 and a connecting part 112, the connecting part 112 is connected to the peripheral side of the main body part 111 and protrudes from the main body part 111 towards the second sub-wall 12, the connecting part 112 is detachably connected to the second sub-wall 12, the main body part 111 is provided with a connecting hole 103 and forms an airflow channel 102, an air inlet 1021 and an air outlet 1022 together with the first sub-wall 11, the air inlet 1021 is arranged on one side of the airflow channel 102 along the first direction Y, and the air outlet 1022 is arranged on the other side of the airflow channel 102.

[0197] The area of each connecting hole 103 is between 0.03mm 2 and 0.28mm 2 The axis direction of the connecting hole 103 is arranged intersecting with the thickness direction X of the first wall 10, the first sub-wall 11 has opposite first and second faces 1111 and 1112 along the thickness direction X, the first face 1111 has a first opening 1101 forming the connecting hole 103, and the second face 1112 has a second opening 1102 forming the connecting hole 103, the first opening 1101 and the second opening 1102 are at least partially arranged staggered in the thickness direction X.

[0198] The battery cell 200 is arranged in the containing cavity 101 and is provided with a pressure relief mechanism 24 configured to release the internal pressure of the battery cell 200, the first wall 10 is arranged towards the pressure relief mechanism 24 along the thickness direction X, and the orthographic projection of the first wall 10 in the thickness direction X covers the pressure relief mechanism 24. The pressure relief mechanism 24 is configured to form a pressure relief hole to release the internal pressure of the battery cell 200, and the axis direction of the pressure relief hole is parallel to the thickness direction X.

[0199] The first fan is connected to the second sub-wall 12 and arranged at the air outlet 1022 to be configured to provide suction force for discharging the gas in the airflow channel 102 from the air outlet 1022, and the second fan is connected to the second sub-wall 12 and arranged at the air inlet 1021 to be configured to provide driving force for the gas to enter the airflow channel 102 from the air inlet 1021. The first sub-wall 11 is provided with a protective coating 300 on the side surface thereof facing the containing cavity 101 along the thickness direction X, and the protective coating 300 is configured to improve the high-temperature resistance of the first sub-wall 11.

[0200] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0201] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the same; although the present application has been described in detail with reference to the foregoing examples, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacements for some of the technical features, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery device, characterized in that, include: The housing has a receiving cavity. The housing includes a first wall, which has an airflow channel and an air inlet and an air outlet communicating with the airflow channel. The first wall also has a plurality of spaced connecting holes on the side facing the receiving cavity along its own thickness direction. The connecting holes communicate with the airflow channel and the receiving cavity. A single battery cell is disposed in the receiving cavity.

2. The battery device according to claim 1, characterized in that, The battery cell is provided with a pressure relief mechanism, which is configured to release the internal pressure of the battery cell. The first wall is disposed toward the pressure relief mechanism along the thickness direction, and the orthographic projection of the first wall in the thickness direction covers the pressure relief mechanism.

3. The battery device according to claim 2, characterized in that, The pressure relief mechanism is configured to form a pressure relief hole to release the internal pressure of the battery cell, the axial direction of the pressure relief hole being parallel to the thickness direction.

4. The battery device according to claim 1, characterized in that, The area of ​​each of the aforementioned connecting holes satisfies the requirement of 0.03 mm². 2 Up to 0.28mm 2 between.

5. The battery device according to claim 1, characterized in that, The area of ​​each of the aforementioned connecting holes satisfies 0.07 mm². 2 up to 0.2mm 2 between.

6. The battery device according to claim 1, characterized in that, The axial direction of the connecting hole intersects with the thickness direction of the first wall.

7. The battery device according to claim 1, characterized in that, The airflow channel has an air inlet on one side along the first direction and an air outlet on the other side, and the first direction intersects the thickness direction.

8. The battery device according to claim 7, characterized in that, From the air inlet to the air outlet, the area of ​​the connecting hole tends to decrease, and / or, from the air inlet to the air outlet, the distance between two adjacent connecting holes tends to increase.

9. The battery device according to claim 7, characterized in that, The length of the first wall in the first direction is greater than its length in the second direction, and the second direction intersects the first direction and the thickness direction.

10. The battery device according to claim 1, characterized in that, The battery device further includes a first fan connected to the housing, the first fan being disposed at the air outlet and configured to provide suction force for the gas in the airflow channel to be discharged from the air outlet; And / or, the battery device further includes a second fan connected to the housing, the second fan being disposed at the air inlet and configured to provide driving force for gas to enter the airflow channel from the air inlet.

11. The battery device according to claim 1, characterized in that, The battery device further includes a protective coating, which is provided on one side surface of the first wall facing the receiving cavity along the thickness direction. The protective coating is configured to improve the high temperature resistance of the first wall.

12. The battery device according to any one of claims 1 to 11, characterized in that, The first wall includes a first sub-wall and a second sub-wall connected together. The first sub-wall is disposed between the second sub-wall and the receiving cavity along the thickness direction. The airflow channel, the air inlet and the air outlet are formed between the first sub-wall and the second sub-wall. The first sub-wall is provided with the connecting hole.

13. The battery device according to claim 12, characterized in that, The first sub-wall and the second sub-wall are detachably connected.

14. The battery device according to claim 12, characterized in that, The strength of the second sub-wall is greater than or equal to the strength of the first sub-wall.

15. The battery device according to claim 12, characterized in that, The melting point of the first sub-wall is greater than or equal to the melting point of the second sub-wall, and / or the melting point of the first sub-wall is greater than or equal to 1400°C.

16. The battery device according to claim 12, characterized in that, The first sub-wall includes a main body and a connecting part. The connecting part is connected to the periphery of the main body and protrudes from the main body toward the second sub-wall. The connecting part is connected to the second sub-wall. The main body is provided with the connecting hole and surrounds the second sub-wall to form the airflow channel, the air inlet and the air outlet.

17. The battery device according to claim 12, characterized in that, The first sub-wall has a first surface and a second surface opposite each other along the thickness direction. The first surface has a first opening forming the connection hole, and the second surface has a second opening forming the connection hole. The first opening and the second opening are at least partially offset from each other in the thickness direction.

18. An electrical appliance, characterized in that, Includes a battery device according to any one of claims 1 to 17, the battery device being used to store or provide electrical energy.

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