Battery device and electric device

Abstract

The application provides a battery device and a power utilization device. The battery device comprises a box body and a battery cell. The box body comprises a side wall, a bottom wall and a reinforcing mechanism. The side wall and the bottom wall form an accommodating cavity. The battery cell is arranged in the accommodating cavity. The reinforcing mechanism is arranged in the accommodating cavity and connected to the side wall and the bottom wall. The reinforcing mechanism plays a role in improving the structural strength of the box body. By arranging the reinforcing mechanism with a density smaller than that of the side wall, the weight of the reinforcing mechanism is reduced, the dead weight of the box body is reduced, and the energy density of the battery device is improved.

Description

Technical Field

[0001] This application relates to the field of batteries, and in particular to a battery device and an electrical device. Background Technology

[0002] Battery devices are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.

[0003] The casing is a crucial component of a battery device, serving to house and protect the internal battery cells. However, in related technologies, the casing's large weight leads to low energy density in the battery device, necessitating improvement. Utility Model Content

[0004] In view of the above problems, this application provides a battery device and an electrical device that can reduce the weight of the casing in order to increase the energy density of the battery device.

[0005] In a first aspect, this application provides a battery device, comprising: a housing, including a side wall, a bottom wall, and a reinforcing mechanism, wherein the side wall and the bottom wall are connected to form a receiving cavity, the reinforcing mechanism is disposed within the receiving cavity and connected to the side wall and the bottom wall; and a battery cell disposed within the receiving cavity, wherein the density of the reinforcing mechanism is less than the density of the side wall.

[0006] In the embodiment of this application, the battery device includes a housing and battery cells. The housing includes side walls, a bottom wall, and a reinforcing mechanism. The side walls and bottom wall enclose a receiving cavity. The battery cells are disposed within the receiving cavity. The reinforcing mechanism is disposed within the receiving cavity and connected to the side walls and bottom wall. The reinforcing mechanism plays a role in improving the structural strength of the housing. By setting the density of the reinforcing mechanism to be less than that of the side walls, it helps to reduce the weight of the reinforcing mechanism and the weight of the housing, thereby increasing the energy density of the battery device.

[0007] In some embodiments, the housing further includes a first adhesive portion disposed on the side of the reinforcing mechanism facing the side wall, and the reinforcing mechanism is bonded to the side wall and the bottom wall through the first adhesive portion.

[0008] In the embodiment of this application, the reinforcing mechanism is bonded to the bottom wall and side wall through the first adhesive part to improve the stability of the reinforcing mechanism in the receiving cavity and thus improve the overall structural strength of the box.

[0009] In some embodiments, the housing further includes a second adhesive portion disposed at one end of the reinforcing mechanism facing the battery cell, and the reinforcing mechanism adheres to the battery cell through the second adhesive portion.

[0010] In the embodiment of this application, the reinforcing mechanism adheres to the battery cell through the second adhesive part and fixes the battery cell through the reinforcing mechanism to improve the stability of the battery cell in the receiving cavity.

[0011] In some embodiments, the reinforcing mechanism includes a wall panel and a hollow cavity enclosed by the wall panel that extends through the reinforcing mechanism in a first direction, wherein a first adhesive portion is disposed between the wall panel and the side wall, and between the wall panel and the bottom wall.

[0012] In the embodiment of this application, the reinforcement mechanism includes a wall panel and a hollow cavity enclosed by the wall panel that extends through the reinforcement mechanism in a first direction. By setting a hollow cavity in the reinforcement mechanism, the cost of the reinforcement mechanism can be reduced, the weight of the reinforcement mechanism can be reduced, and the energy density of the battery device can be increased.

[0013] In some embodiments, the wall panel includes a first sub-wall panel and a second sub-wall panel disposed opposite to each other in a second direction. The first sub-wall panel is bonded to the side wall by a first adhesive portion. The first sub-wall panel has a dimension L1 in a third direction, and the second sub-wall panel has a dimension L2 in a third direction, which satisfies L1 > L2. The first direction, the second direction, and the third direction intersect each other.

[0014] In the embodiment of this application, by setting the size of the first sub-wall panel in the third direction to be larger than that of the second sub-wall panel in the third direction, the first sub-wall panel can have a larger area to contact the side wall, thereby improving the connection strength between the reinforcement mechanism and the side wall. At the same time, the volume of the reinforcement mechanism can be reduced, the self-weight of the reinforcement mechanism can be reduced, and the energy density of the housing can be increased.

[0015] In some embodiments, the wall panel further includes a third sub-wall panel and a fourth sub-wall panel disposed opposite to each other in a third direction. The third sub-wall panel is located between the fourth sub-wall panel and the bottom wall. The third sub-wall panel is connected to the first sub-wall panel and the second sub-wall panel. The fourth sub-wall panel is connected to the first sub-wall panel and the second sub-wall panel and is inclined relative to the first sub-wall panel toward the third sub-wall panel.

[0016] In the embodiment of this application, the fourth sub-wall panel is inclined and connected between the first sub-wall panel and the second sub-wall panel. The fourth sub-wall panel can be used to support the first sub-wall panel and the second sub-wall panel to improve the rigidity of the reinforcement mechanism.

[0017] In some embodiments, the reinforcing mechanism further includes a reinforcing rib connected to the wall panel and extending in the hollow cavity along a second direction, wherein the first and second directions intersect.

[0018] In the embodiments of this application, reinforcing ribs are provided in the hollow cavity to enhance the structural strength of the reinforcement mechanism.

[0019] In some embodiments, the sidewall includes two first wall portions and two second wall portions connected to each other, the two first wall portions being disposed opposite each other along a second direction, the two second wall portions being disposed opposite each other along a first direction, the first direction and the second direction intersecting, the box body also includes a mounting beam disposed on the first wall portion, and a reinforcement mechanism connected to the first wall portion and the bottom wall.

[0020] In the embodiment of this application, by placing the mounting beam and the reinforcing mechanism on both sides of the first wall, the reinforcing mechanism can fully play its role in enhancing the strength of the box structure.

[0021] In some embodiments, the bottom wall includes a protective plate and a heat exchange section stacked in its thickness direction. The heat exchange section is used to contain a heat exchange medium and is disposed on the side of the protective plate facing the receiving cavity. A side wall and a reinforcing mechanism are disposed on the heat exchange section.

[0022] In the embodiment of this application, the heat exchange section is disposed on the side of the protective plate facing the receiving cavity. The heat exchange section and the battery cell are thermally connected to regulate the temperature of the battery cell. The side wall and the reinforcing mechanism are disposed on the heat exchange section to improve the overall stability of the housing.

[0023] In some embodiments, the sidewalls are made of metal and the reinforcing mechanism is made of composite material.

[0024] In the embodiments of this application, the sidewalls are made of metal to enhance the structural strength of the housing, and the reinforcing mechanism is made of composite material to reduce the weight of the housing and increase the energy density of the battery device.

[0025] Secondly, embodiments of this application provide an electrical device, including the battery device of any of the embodiments of the first aspect described above. Attached Figure Description

[0026] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0027] Figure 1 This is a schematic diagram of the structure of a vehicle provided in one embodiment of this application;

[0028] Figure 2 This is a schematic diagram of the structure of a battery device provided in an embodiment of this application;

[0029] Figure 3 This is a schematic diagram of the structure of a battery module provided in one embodiment of the application;

[0030] Figure 4 This is an exploded view of a single battery cell provided in an embodiment of this application;

[0031] Figure 5 This is a schematic diagram of the structure of a battery device provided in an embodiment of this application;

[0032] Figure 6 This is a schematic diagram of the structure of the battery device housing provided in one embodiment of this application;

[0033] Figure 7 This is a partial structural schematic diagram of a battery device provided in one embodiment of this application;

[0034] Figure 8 This is a schematic diagram of the structure of the reinforcement mechanism of the battery device provided in one embodiment of this application;

[0035] Figure 9 This is a partial structural schematic diagram of the reinforcement mechanism of a battery device provided in one embodiment of this application.

[0036] Figure label:

[0037] 1. Vehicle; 101. Motor; 102. Controller; 2. Battery Unit; 201. Battery Module; 202. Housing; 2021. First Housing; 2022. Second Housing;

[0038] 3. Battery cell; 31. Casing; 32. Electrode assembly; 33. Electrode terminal;

[0039] 4. Side wall; 41. First wall portion; 42. Second wall portion;

[0040] 5. Bottom wall; 51. Protective plate; 52. Heat exchange section;

[0041] 61. Receiving cavity; 62. Mounting beam;

[0042] 7. Reinforcing mechanism; 71. Wall panel; 72. Hollow cavity; 73. Reinforcing rib; 711. First sub-wall panel; 712. Second sub-wall panel; 713. Third sub-wall panel; 714. Fourth sub-wall panel;

[0043] 8. First adhesive part;

[0044] 9. Second adhesive part;

[0045] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0046] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0047] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0048] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0049] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0050] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0051] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0052] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0053] The casing is a crucial component of a battery device, serving to house and protect the internal battery cells. However, in related technologies, the casing's large weight leads to low energy density in the battery device, necessitating improvement.

[0054] The reason for the above problems is that the box can be a roll-formed box. The roll-formed box is made of sheet metal parts and welded together. Due to the limitations of the welding process, steel parts are also required in other stress areas of the box except for the beams, which results in excessive weight of the box and low energy density of the battery cells.

[0055] To address the aforementioned issues, this application provides a battery device comprising a housing and individual battery cells. The housing includes side walls, a bottom wall, and a reinforcing mechanism. The side walls and bottom wall enclose a receiving cavity, in which the individual battery cells are disposed. The reinforcing mechanism is disposed within the receiving cavity and connected to the side walls and bottom wall. The reinforcing mechanism enhances the structural strength of the housing. By setting the density of the reinforcing mechanism to be less than that of the side walls, the weight of the reinforcing mechanism is reduced, thereby reducing the weight of the housing and increasing the energy density of the battery device.

[0056] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.

[0057] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0058] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0059] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this application embodiment is not limited to this. The battery cell can be cylindrical, flat, cuboid, or other shapes, and this application embodiment is not limited to this either.

[0060] The battery device mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery device mentioned in this application may include a battery module or a battery pack. A battery pack generally includes a housing for encapsulating one or more battery cells. The housing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0061] A single battery cell includes electrode components and an electrolyte. The electrode components include a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode components. The positive electrode includes a positive current collector and a positive active material layer, the latter coated on the surface of the current collector. The current collector includes a positive current-collecting section and a positive electrode tab connected to it. The current-collecting section is coated with the positive active material layer, while the tab is not. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material layer includes the positive active material, which can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet includes a negative current collector and a negative active material layer, the negative active material layer being coated on the surface of the negative current collector. The negative current collector includes a negative current collection section and a negative electrode tab connected to the negative current collection section. The negative current collection section is coated with the negative active material layer, while the negative electrode tab is not coated with the negative active material layer. The material of the negative current collector can be copper, and the negative active material layer includes negative active material, which can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0062] It should be understood that the technical solutions described in the embodiments of this application are not limited to the battery devices and electrical equipment described above, but can also be applied to all battery devices including housings and electrical equipment using battery devices. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0063] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle 1 provided in some embodiments of this application. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery device 2 is installed inside vehicle 1, and the battery device 2 can be located at the bottom, front, or rear of vehicle 1. The battery device 2 can be used to power vehicle 1; for example, the battery device 2 can serve as the operating power source for vehicle 1. Vehicle 1 may also include a controller 102 and a motor 101. The controller 102 is used to control the battery to supply power to the motor 101, for example, to meet the power needs of vehicle 1 during starting, navigation, and driving.

[0064] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0065] Figure 2 A schematic diagram of the structure of a battery device 2 according to an embodiment of this application is shown.

[0066] The battery device 2 mentioned in the embodiments of this application may include one or more battery cells 3 assemblies for providing voltage and capacity. The battery cell 3 assembly may include multiple battery cells 3, which are connected in series, parallel, or mixed connection via a busbar component.

[0067] In some embodiments, the battery cell 3 assembly is typically formed by arranging a plurality of battery cells 3.

[0068] As an example, the battery cell 3 assembly can be a battery module 201, which is formed by arranging and fixing multiple battery cells 3 to form an independent module. As an example, the battery module 201 can be formed by bundling multiple battery cells 3 together with cable ties.

[0069] In some embodiments, the battery device 2 may be a battery pack, which includes a housing 202 and one or more battery cell 3 assemblies, the battery cell 3 assemblies being housed in the housing 202.

[0070] As an example, the battery cell 3 assembly can be a battery module 201, and the battery cell 3 assembly can be housed in the housing 202 by fixing the battery module 201 in the housing 202.

[0071] As an example, the battery cell 3 assembly can also be housed in the housing 202 by directly fixing multiple battery cells 3 to the housing 202.

[0072] As an example, the housing 202 may include a first housing 2021 and a second housing 2022. The first housing 2021 and the second housing 2022 are fastened together to form a closed space inside the housing 202 to house the battery cell 3 assembly. Here, "closed" refers to covering or closing, which can be sealed or unsealed. The first housing 2021 may be an end cap or a bottom plate.

[0073] As an example, the housing 202 may include an end cap, a frame, and a base plate. The end cap and the base plate are respectively connected to the frame, so that the interior of the housing 202 forms a closed space to accommodate the battery cell 3 assembly.

[0074] In some embodiments, the housing 202 may be part of the chassis structure of the vehicle 1. For example, a portion of the housing 202 may be at least a portion of the floor of the vehicle 1, or a portion of the housing 202 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1.

[0075] Figure 3 A schematic diagram of the structure of a battery module 201 according to an embodiment of this application is shown.

[0076] In some embodiments, such as Figure 2 and Figure 3 As shown, there are multiple battery cells 3. These multiple battery cells 3 are first connected in series, parallel, or in a mixed manner to form a battery module 201. The multiple battery modules 201 are then connected in series, parallel, or in a mixed manner to form a whole, which is housed in the casing 202.

[0077] Multiple battery cells 3 in the battery module 201 can be electrically connected through a busbar component to achieve parallel, series, or mixed connection of multiple battery cells 3 in the battery module 201.

[0078] Figure 4 This is an exploded view of a battery cell 3 provided in an embodiment of this application. The battery cell 3 refers to the smallest unit that makes up the battery device 2. For example... Figure 4 The battery cell 3 includes an end cap assembly, a housing 31, and an electrode assembly 32.

[0079] Electrode assembly 32 is the component in the battery cell 3 where electrochemical reactions occur. The casing 31 may contain one or more electrode assemblies 32. The electrode assembly 32 is mainly formed by winding or stacking electrode sheets, which are divided into positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the electrode body, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative tabs can be located together at one end of the electrode body or separately at both ends of the electrode body. During the charging and discharging process of the battery cell 3, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals 33 to form a current loop.

[0080] The electrode assembly 32 can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0081] In some embodiments, the electrode assembly 32 is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0082] In some embodiments, the electrode assembly 32 is a stacked structure. As an example, multiple positive and negative electrodes can be provided, with multiple positive and multiple negative electrodes stacked alternately. Multiple spacers can be provided and respectively provided between any adjacent positive or negative electrodes. Alternatively, the spacers can be provided continuously and provided between any adjacent positive or negative electrodes by folding.

[0083] In some embodiments, the electrode assembly 32 may be cylindrical, flat, or polygonal in shape.

[0084] In some embodiments, the electrode assembly 32 is provided with tabs that can conduct current from the electrode assembly 32. The tabs include a positive tab and a negative tab.

[0085] The battery cell 3 may include a housing 31. The housing 31 is an assembly used to cooperate with the end cap assembly to form the internal environment of the battery cell 3, wherein the formed internal environment can accommodate the electrode assembly 32, electrolyte (not shown in the figure), and other components. The housing 31 can be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing 31), or an aluminum-plastic film, etc. In some embodiments, the housing 31 can be a sealed structure or a non-sealed structure. As an example, when the housing 31 is a non-sealed structure, the housing 31 serves to protect the electrode assembly 32, and a sealing bag is also included between the housing 31 and the electrode assembly 32. The sealing bag is used to encapsulate the electrode assembly 32 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating material or an aluminum-plastic film. When the housing 31 is a sealed structure, it is used to encapsulate the electrode assembly 32 and electrolyte, etc.

[0086] As an example, the battery cell 3 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 square battery cells, blade-shaped battery cells, and multi-prismatic battery cells. Multi-prismatic battery cells are, for example, hexagonal prismatic battery cells. This application does not have any particular limitations.

[0087] The housing 31 and the end cap assembly can be independent components. One or more openings can be provided on the housing 31, and one or more end cap assemblies can close the openings to form the internal environment of the battery cell 3. Optionally, the end cap assembly and the housing 31 can also be integrated. Optionally, the end cap assembly and the housing 31 can form a common connection surface before other components are inserted into the housing, and the end cap assembly closes the housing 31 when it is necessary to encapsulate the interior of the housing 31.

[0088] In some embodiments, the electrode terminal 33 can be disposed on the end cap assembly or on the housing 31, and the electrode terminal 33 is electrically connected to the electrode tab. The electrode terminal 33 can be directly connected to the electrode tab or indirectly connected to the electrode tab through an adapter mechanism.

[0089] Please see Figure 5 and Figure 6 , Figure 5 This is a schematic diagram of the structure of a battery device provided in an embodiment of this application; Figure 6 This is a schematic diagram of the casing of a battery device provided in one embodiment of this application.

[0090] Firstly, such as Figure 5 and Figure 6 As shown, this application provides a battery device 2, which includes a housing 202 and a battery cell 3. The housing 202 includes a side wall 4, a bottom wall 5, and a reinforcing mechanism 7. The side wall 4 and the bottom wall 5 are connected to form a receiving cavity 61. The reinforcing mechanism 7 is disposed in the receiving cavity 61 and connected to the side wall 4 and the bottom wall 5. The battery cell 3 is disposed in the receiving cavity 61, wherein the density of the reinforcing mechanism 7 is less than the density of the side wall 4.

[0091] In the embodiment of this application, the battery device 2 includes a housing 202 and a battery cell 3. The housing 202 includes a side wall 4, a bottom wall 5, and a reinforcing mechanism 7. The side wall 4 and the bottom wall 5 enclose a receiving cavity 61. The battery cell 3 is disposed in the receiving cavity 61. The reinforcing mechanism 7 is disposed in the receiving cavity 61 and connected to the side wall 4 and the bottom wall 5. The reinforcing mechanism 7 plays a role in improving the structural strength of the housing 202. By setting the density of the reinforcing mechanism 7 to be less than that of the side wall 4, it helps to reduce the weight of the reinforcing mechanism 7 and the weight of the housing 202, thereby increasing the energy density of the battery device 2.

[0092] Optionally, the sidewalls 4 are connected end to end to form a frame, and the bottom wall 5 is connected to the frame on one side in its own thickness direction to form a receiving cavity 61. Exemplarily, the sidewall frame 4 is rectangular.

[0093] Optionally, the housing 202 can be a roll-formed housing 202, a stamped housing 202, or a profile housing 202, etc. The side wall 4 of the roll-formed housing 202 is formed by roll forming of metal plates, the stamped housing 202 is formed by welding of metal stamping plates, and the profile housing 202 is formed by welding of metal profiles.

[0094] Optionally, the side wall 4 and the bottom wall 5 can be welded, riveted, or bolted together.

[0095] Optionally, the bottom wall 5 can be made of metal to improve the overall structural strength of the box 202, or the bottom wall 5 can be made of non-metallic material to reduce the weight of the box 202.

[0096] Optionally, multiple battery cells 3 are disposed in the receiving cavity 61 to increase the capacity of the battery device 2. For example, multiple battery cells 3 are arranged in rows and columns.

[0097] Optionally, the reinforcing mechanism 7 is disposed in the receiving cavity 61 and connected to the bottom wall 5 and the side wall 4 to improve the connection stability of the side wall 4 and the bottom wall 5, thereby enhancing the structural strength of the box 202.

[0098] Optionally, the reinforcing mechanism 7 extends continuously within the receiving cavity 61 to enhance the structural strength of the housing 202; or multiple reinforcing mechanisms 7 are spaced apart to reduce the weight of the housing 202.

[0099] Optionally, the dimensions of the reinforcing mechanism 7 in the third direction Z can be designed independently, and the reinforcing mechanism 7 in the third direction Z does not exceed the receiving cavity 61.

[0100] The density of the reinforcing mechanism 7 is less than that of the side wall 4. Specifically, compared with the related technology in which the reinforcing mechanism 7 and the side wall 4 are formed by the same material, in this embodiment of the application, the material of the reinforcing mechanism 7 is replaced with a material with a lower density. The weight of the reinforcing mechanism 7 is reduced, the weight of the housing 202 is reduced, the energy density of the battery device 2 is increased, and it helps to reduce the cost of the housing 202.

[0101] Optionally, the stiffness of the reinforcing mechanism 7 should be designed according to the actual situation. For example, the stiffness of the reinforcing mechanism 7 should not be less than 200MPa. For example, the stiffness of the reinforcing mechanism 7 is 200MPa, 300MPa, 500MPa, etc.

[0102] Optionally, the size of the reinforcing mechanism 7 can be determined according to the stiffness requirements and material type of the reinforcing mechanism 7. For example, compared with related technologies, in this embodiment, the material of the reinforcing mechanism 7 is replaced with a material with lower density, and the overall size of the reinforcing mechanism 7 remains unchanged, thus reducing the overall weight of the reinforcing mechanism 7.

[0103] In some embodiments, such as Figure 6As shown, sidewall 4 is a metal part, and reinforcing mechanism 7 is a composite material part.

[0104] In these embodiments, the sidewall 4 is made of metal to enhance the structural strength of the housing 202, and the reinforcing mechanism 7 is made of composite material to reduce the weight of the housing 202 and increase the energy density of the battery device 2.

[0105] Optionally, the side wall 4 is a sheet metal part, and the material of the exemplary side wall 4 can be aluminum alloy or alloy steel, etc.

[0106] Optionally, the reinforcing mechanism 7 can be formed by composite material compression molding, pultrusion molding, hand lay-up, etc. For example, pultrusion molding refers to a process method in which continuous fibers or their fabrics are impregnated with resin under the traction of a traction device and the resin is cured by heating a molding die to produce composite material parts.

[0107] Compared to sheet metal parts, composite material parts have shorter mold opening cycles, longer mold usage time, and lower maintenance costs.

[0108] For example, the reinforcing mechanism 7 can be a structural component formed from fiber prepreg and prepared by pultrusion molding.

[0109] Optionally, the composite material component includes fibers and a matrix, with the matrix attached to the continuous fibers. The composite material component features low density, light weight, and high strength. This means that while reducing the weight of the housing 202 and thus the battery device 2, it also improves the structural strength of the housing 202. For example, the reinforcing mechanism 7 is an FRC-TS-1000 composite material.

[0110] For example, the fiber is a long fiber or a continuous fiber. For example, the fiber can be glass fiber, aramid fiber, carbon fiber, basalt fiber, etc.

[0111] For example, the matrix is ​​a thermoplastic resin, which has advantages such as good toughness, high damage tolerance, and good dielectric constant.

[0112] Please see Figure 7 , Figure 7 This is a partial structural schematic diagram of a battery device provided in one embodiment of this application.

[0113] In some embodiments, such as Figure 6 and Figure 7 As shown, the housing 202 also includes a first adhesive part 8, which is disposed on the side of the reinforcing mechanism 7 facing the side wall 4 and the bottom wall 5. The reinforcing mechanism 7 is bonded to the side wall 4 and the bottom wall 5 through the first adhesive part 8.

[0114] In these embodiments, the reinforcing mechanism 7 is bonded to the bottom wall 5 and the side wall 4 via the first adhesive portion 8 to improve the stability of the reinforcing mechanism 7 in the receiving cavity 61, thereby improving the overall structural strength of the housing 202.

[0115] Compared to the welding connection between the reinforcing mechanism 7 and the side wall 4 in the prior art, the reinforcing mechanism 7 and the side wall 4 are bonded together in this embodiment. While improving the structural strength of the box 202 through the reinforcing mechanism 7, this helps to reduce the processing cost of the box 202.

[0116] Optionally, the reinforcing mechanism 7 is connected to one end of the side wall 4 near the bottom wall 5, and is disposed on the end of the bottom wall 5 near the side wall 4, to enhance the stability of the housing 202.

[0117] Optionally, the first adhesive portion 8 covers the entire surface of the reinforcing mechanism 7 facing the side wall 4, and / or the first adhesive portion 8 covers the entire surface of the reinforcing mechanism 7 facing the bottom wall 5. By increasing the adhesive area of ​​the reinforcing mechanism 7, the side wall 4, and the bottom wall 5, the connection strength is enhanced, and the structural strength of the housing 202 is improved.

[0118] Optionally, the material and arrangement area of ​​the first adhesive portion 8 can be designed according to actual conditions. For example, the bonding force between the reinforcing mechanism 7 and the side wall 4 and bottom wall 5 through the first adhesive portion 8 is not less than 2 MPa.

[0119] In some embodiments, such as Figure 6 and Figure 7 As shown, the housing 202 also includes a second adhesive part 9, which is disposed at one end of the reinforcing mechanism 7 facing the battery cell 3. The reinforcing mechanism 7 adhesively attaches the battery cell 3 through the second adhesive part 9.

[0120] In these embodiments, the reinforcing mechanism 7 adheres to the battery cell 3 via the second adhesive portion 9, and fixes the battery cell 3 via the reinforcing mechanism 7 to improve the stability of the battery cell 3 in the receiving cavity 61.

[0121] Optionally, the second adhesive portion 9 covers the side surface of the reinforcing mechanism 7 facing the battery cell 3 to increase the connection area between the reinforcing mechanism 7 and the battery cell 3, thereby enhancing the stability of the battery cell 3 in the housing 202.

[0122] Optionally, the second adhesive part 9 is a thermally conductive colloid, which helps the heat of the battery cell 3 to be exchanged with the outside through the housing 202.

[0123] Optionally, the first adhesive part 8 and the second adhesive part 9 are connected. For example, during the installation of the reinforcing mechanism 7, adhesive is applied between the reinforcing mechanism 7 and the side wall 4 and the bottom wall 5 to form the first adhesive part 8. A specific tooling is used to squeeze the reinforcing mechanism 7 with a preset pressure value to improve the connection strength between the reinforcing mechanism 7 and the side wall 4 and the bottom wall 5. During the pressing process, the adhesive overflows between the reinforcing mechanism 7 and the battery cell 3 to form the second adhesive part 9. There is no need to actively set the second adhesive part 9, which helps to simplify the installation process of the reinforcing mechanism 7.

[0124] Please see Figure 8 , Figure 8 This is a schematic diagram of the structure of the reinforcement mechanism of the battery device provided in one embodiment of this application.

[0125] In some embodiments, such as Figures 6 to 8 As shown, the reinforcing mechanism 7 includes a wall panel 71 and a hollow cavity 72 enclosed by the wall panel 71 that penetrates the reinforcing mechanism 7 in the first direction X. The first adhesive part 8 is disposed between the wall panel 71 and the side wall 4, and between the wall panel 71 and the bottom wall 5.

[0126] In these embodiments, the reinforcing mechanism 7 includes a wall panel 71 and a hollow cavity 72 enclosed by the wall panel 71 that penetrates the reinforcing mechanism 7 in the first direction X. By providing the hollow cavity 72 in the reinforcing mechanism 7, the cost of the reinforcing mechanism 7 can be reduced, the weight of the reinforcing mechanism 7 can be reduced, and the energy density of the battery device 2 can be increased.

[0127] Optionally, the first direction X is the extension direction of the reinforcing mechanism 7.

[0128] Optionally, the wall panel 71 is arranged around a straight line extending in the first direction X to form a hollow cavity 72. The thickness of the wall panel 71 should be designed according to the actual situation.

[0129] Optionally, the reinforcing mechanism 7 is integrally formed without splicing seams, so as to improve the structural strength of the reinforcing mechanism 7.

[0130] For example, the reinforcing mechanism 7 is prismatic in shape extending in the first direction X, and the hollow cavity 72 can be cylindrical or prismatic in shape extending in the first direction X.

[0131] Optionally, no other structural components are installed in the hollow cavity 72, that is, the reinforcing mechanism 7 maintains a single cavity cross section, and the reinforcing mechanism 7 can be pultruded and cut to a fixed length, which helps to reduce the self-weight of the reinforcing mechanism 7 and simplify the forming steps of the reinforcing mechanism 7.

[0132] Please see Figure 9 , Figure 9 This is a partial structural schematic diagram of the reinforcing mechanism 7 of the battery device 2 provided in one embodiment of this application.

[0133] In some embodiments, such as Figures 6 to 9 As shown, the wall panel 71 includes a first sub-wall panel 711 and a second sub-wall panel 712 disposed opposite to each other in the second direction Y. The first sub-wall panel 711 is bonded to the side wall 4 through the first adhesive part 8. The first sub-wall panel 711 has a dimension L1 in the third direction Z, and the second sub-wall panel 712 has a dimension L2 in the third direction Z, satisfying L1 > L2. The first direction X, the second direction Y, and the third direction Z intersect each other.

[0134] In these embodiments, by setting the size of the first sub-wall panel 711 in the third direction Z to be larger than the size of the second sub-wall panel 712 in the third direction Z, the first sub-wall panel 711 can have a larger area to contact the side wall 4, thereby improving the connection strength between the reinforcing mechanism 7 and the side wall 4. At the same time, the volume of the reinforcing mechanism 7 can be reduced, the self-weight of the reinforcing mechanism 7 can be reduced, and the energy density of the housing 202 can be increased.

[0135] For example, the third-party direction Z is the depth direction of the box 202.

[0136] It should be clarified that, since the reinforcing mechanism 7 is connected to the bottom wall 5, the end of the second sub-wall panel 712 facing away from the bottom wall 5 does not exceed the first sub-wall panel 711. Considering that the connection strength requirement between the reinforcing mechanism 7 and the side wall 4 is lower than the connection strength requirement between the reinforcing mechanism 7 and the battery cell 3, the dimension of the second sub-wall panel 712 in the third direction Z can be reduced.

[0137] Optionally, the first sub-wall panel 711 is closer to the side wall 4 in the second direction Y than the second sub-wall panel 712, and the first adhesive part 8 is disposed between the first sub-wall panel 711 and the side wall 4, and the first sub-wall panel 711 is bonded to the side wall 4 through the first adhesive part 8.

[0138] Optionally, the second sub-wall panel 712 is closer to the battery cell 3 in the second direction Y than the first sub-wall panel 711, and the second adhesive part 9 is disposed between the second sub-wall panel 712 and the battery cell 3, and the second sub-wall panel 712 is bonded to the battery cell 3 through the second adhesive part 9.

[0139] Optionally, the specific dimensions of the first sub-wall panel 711 and the second sub-wall panel 712 in the third direction Z can be determined by the user.

[0140] In some embodiments, such as Figures 6 to 8 As shown, the wall panel 71 also includes a third sub-wall panel 713 and a fourth sub-wall panel 714 disposed opposite each other in the third direction Z. The third sub-wall panel 713 is located between the fourth sub-wall panel 714 and the bottom wall 5. The third sub-wall panel 713 is connected to the first sub-wall panel 711 and the second sub-wall panel 712. The fourth sub-wall panel 714 is connected to the first sub-wall panel 711 and the second sub-wall panel 712, and is inclined relative to the first sub-wall panel 711 toward the third sub-wall panel 713.

[0141] In these embodiments, an inclined fourth sub-wall panel 714 is connected between the first sub-wall panel 711 and the second sub-wall panel 712. The fourth sub-wall panel 714 can be used to support the first sub-wall panel 711 and the second sub-wall panel 712 to improve the rigidity of the reinforcing mechanism 7.

[0142] Specifically, the first adhesive part 8 is disposed between the third sub-wall panel 713 and the bottom wall 5. The third sub-wall panel 713 is bonded to the bottom wall 5 through the first adhesive part 8. The third sub-wall panel 713 is connected to the end of the first sub-wall panel 711 and the second sub-wall panel 712 near the bottom wall 5. The fourth sub-wall panel 714 is connected to the end of the first sub-wall panel 711 and the second sub-wall panel 712 away from the bottom wall 5.

[0143] Optionally, the fourth sub-wall panel 714 is connected to the first sub-wall panel 711 and the second sub-wall panel 712, and is inclined relative to the first sub-wall panel 711 toward the third sub-wall panel 713. The fourth sub-wall panel 714 extends inclined along a straight path. Compared with the fourth sub-wall panel 714 that extends along a bent path in the second direction Y and the third direction Z, the fourth sub-wall panel 714 that extends inclined along a straight path can provide a good support effect between the first sub-wall panel 711 and the second sub-wall panel 712, and can also absorb part of the extrusion force of the battery cell 3 and the reinforcing mechanism 7 in the second direction Y.

[0144] For example, the tilt angle of the fourth sub-panel 714 can be designed by the user.

[0145] In some embodiments, such as Figure 8 and Figure 9 As shown, the reinforcing mechanism 7 also includes a reinforcing rib 73, which is connected to the wall panel 71 and extends in the hollow cavity 72 along the second direction Y, where the first direction X and the second direction Y intersect.

[0146] In these embodiments, the structural strength of the reinforcing mechanism 7 is enhanced by providing reinforcing ribs 73 within the hollow cavity 72.

[0147] Optionally, one end of the reinforcing rib 73 is fixedly connected to the first sub-wall panel 711 or the second sub-wall panel 712, and the other end is a movable end, so that the reinforcing mechanism 7 can better absorb energy through deformation; or both ends of the reinforcing rib 73 are fixedly connected to the first sub-wall panel 711 and the second sub-wall panel 712 respectively, so as to improve the structural strength of the reinforcing mechanism 7.

[0148] Optionally, the reinforcing rib 73 extends straight along the second direction Y, or the reinforcing rib 73 extends obliquely along the second direction Y and the third direction Z, so that the reinforcing mechanism 7 can better absorb energy during deformation.

[0149] Optionally, multiple reinforcing ribs 73 are spaced apart along the third direction Z to enhance the structural strength of the reinforcing mechanism 7.

[0150] Optionally, the reinforcing rib 73 and the wall panel 71 are integrally formed to improve the reliability of the connection between them.

[0151] Optionally, the reinforcing ribs 73 extend continuously along the first direction X within the hollow cavity 72 to enhance the structural strength of the reinforcing mechanism 7, or the reinforcing ribs 73 are spaced apart along the first direction X within the hollow cavity 72 to reduce the self-weight of the reinforcing mechanism 7.

[0152] In some embodiments, such as Figure 6 and Figure 7 As shown, the side wall 4 includes two first wall portions 41 and two second wall portions 42 connected to each other. The two first wall portions 41 are arranged opposite each other along the second direction Y, and the two second wall portions 42 are arranged opposite each other along the first direction X. The first direction X and the second direction Y intersect. The box body 202 also includes a mounting beam 62, which is disposed on the first wall portion 41. The reinforcing mechanism 7 is connected to the first wall portion 41 and the bottom wall 5.

[0153] In these embodiments, by distributing the mounting beam 62 and the reinforcing mechanism 7 on both sides of the first wall portion 41, the reinforcing mechanism 7 can fully enhance the structural strength of the box 202.

[0154] Specifically, adjacent first wall portions 41 and second wall portions 42 are connected to form a frame-like sidewall 4 connected end to end, and the sidewall 4 and bottom wall 5 are connected to form a receiving cavity 61.

[0155] The first wall portion 41 extends along the first direction X, and the reinforcing mechanism 7 extends continuously along the first direction X in the first wall portion 41, or multiple reinforcing mechanisms 7 are spaced apart along the first direction X in the first wall portion 41.

[0156] The mounting beam 62 is located on the side of the first wall 41 opposite to the receiving cavity 61 and extends along the first direction X. The housing 202 is locked to the installation position by the mounting beam 62. The battery cell 3 is far from the mounting point, forming a cantilever structure. Therefore, a reinforcing mechanism 7 can be set between the first wall 41 and the bottom wall 5 to improve the overall structural strength of the housing 202.

[0157] In some embodiments, such as Figure 6 and Figure 7 As shown, the bottom wall 5 includes a protective plate 51 and a heat exchange section 52 stacked in its thickness direction. The heat exchange section 52 is used to contain the heat exchange medium. The heat exchange section 52 is disposed on the side of the protective plate 51 facing the receiving cavity 61. The side wall 4 and the reinforcing mechanism 7 are disposed on the heat exchange section 52.

[0158] In these embodiments, the heat exchange section 52 is disposed on the side of the protective plate 51 facing the receiving cavity 61. The heat exchange section 52 and the battery cell 3 are thermally connected to regulate the temperature of the battery cell 3. The side wall 4 and the reinforcing mechanism 7 are disposed on the heat exchange section 52 to improve the overall stability of the housing 202.

[0159] Specifically, the heat exchange section 52 is thermally connected to the battery cell 3. The heat exchange section 52 includes several heat exchange channels extending along the first direction X or the second direction Y. The heat exchange channels can accommodate the heat exchange medium, and the heat exchange medium circulates within the heat exchange section 52 to regulate the temperature of the battery cell 3.

[0160] Optionally, the heat exchange section 52 itself forms a heat exchange channel to reduce the risk of heat exchange medium leakage, or the heat exchange section 52 and the protective plate 51 together form a heat exchange channel to reduce the weight of the housing 202.

[0161] Optionally, the heat exchange section 52 is made of metal to better transfer heat to the battery cell 3; the protective plate 51 is made of metal to improve the structural strength of the housing 202; or the protective plate 51 is made of non-metallic material to reduce the weight of the housing 202.

[0162] Optionally, the sidewall 4 and the heat exchange section 52 are welded or riveted together, and the reinforcing mechanism 7 and the heat exchange section 52 are bonded together.

[0163] Secondly, embodiments of this application provide an electrical device, including the battery device 2 of any of the embodiments of the first aspect described above.

[0164] In some embodiments, such as Figure 1 system Figure 9As shown, the battery device 2 includes a housing 202 and battery cells 3. The housing 202 includes side walls 4, a bottom wall 5, and a reinforcing mechanism 7. The side walls 4 and the bottom wall 5 are connected to form a receiving cavity 61. The side walls 4 include two first wall portions 41 and two second wall portions 42 that are connected to each other. The two first wall portions 41 are arranged opposite each other along a second direction Y, and the two second wall portions 42 are arranged opposite each other along a first direction X. The first direction X and the second direction Y intersect. The housing 202 also includes a mounting beam 62. The mounting beam 62 is provided with... The reinforcing mechanism 7 is disposed within the receiving cavity 61 and connected to the first wall portion 41 and the bottom wall 5. The density of the reinforcing mechanism 7 is less than that of the side wall 4. The housing 202 also includes a first adhesive portion 8 and a second adhesive portion 9. The second adhesive portion 9 is disposed at the end of the reinforcing mechanism 7 facing the battery cell 3. The reinforcing mechanism 7 is bonded to the battery cell 3 through the second adhesive portion 9. The reinforcing mechanism 7 includes a wall panel 71 and a hollow cavity 72 enclosed by the wall panel 71 that penetrates the reinforcing mechanism 7 in the first direction X. The wall panel 71 includes a first sub-wall panel 711 and a second sub-wall panel 712 disposed opposite each other in the second direction Y, and a third sub-wall panel 713 and a fourth sub-wall panel 714 disposed opposite each other in the third direction Z. The first sub-wall panel 711 is bonded to the side wall 4 through a first adhesive part 8. The third sub-wall panel 713 is located between the fourth sub-wall panel 714 and the bottom wall 5. The dimension L1 of the first sub-wall panel 711 in the third direction Z and the dimension L2 of the second sub-wall panel 712 in the third direction Z satisfy L1 > L2. The third sub-wall panel 713 is connected to the first sub-wall panel 711 and the second sub-wall panel 712. The fourth sub-wall panel 714 is connected to the first sub-wall panel 711 and the second sub-wall panel 712 and is inclined relative to the first sub-wall panel 711 toward the third sub-wall panel 713. The reinforcing mechanism 7 also includes a reinforcing rib 73, which is connected to the wall panel 71 and extends in the hollow cavity 72 along the second direction Y. The first direction X and the second direction Y intersect. The side wall 4 is a metal part, and the reinforcing mechanism 7 is a composite material part.

[0165] In these embodiments, the battery device 2 includes a housing 202 and a battery cell 3. The housing 202 includes a side wall 4, a bottom wall 5, and a reinforcing mechanism 7. The side wall 4 and the bottom wall 5 enclose a receiving cavity 61. The battery cell 3 is disposed in the receiving cavity 61. The reinforcing mechanism 7 is disposed in the receiving cavity 61 and connected to the side wall 4 and the bottom wall 5. The reinforcing mechanism 7 plays a role in improving the structural strength of the housing 202. By setting the density of the reinforcing mechanism 7 to be less than that of the side wall 4, it helps to reduce the weight of the reinforcing mechanism 7 and the weight of the housing 202, thereby increasing the energy density of the battery device 2.

[0166] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: The enclosure includes side walls, a bottom wall, and a reinforcing mechanism. The side walls and the bottom wall are connected to form a receiving cavity. The reinforcing mechanism is disposed within the receiving cavity and connected to the side walls and the bottom wall. The battery cells are disposed within the receiving cavity. The density of the reinforcing mechanism is less than the density of the sidewall.

2. The battery device according to claim 1, characterized in that, The housing also includes a first adhesive portion, which is disposed on the side of the reinforcing mechanism facing the side wall and the bottom wall. The reinforcing mechanism is bonded to the side wall and the bottom wall through the first adhesive portion.

3. The battery device according to claim 1, characterized in that, The housing also includes a second adhesive portion, which is disposed at one end of the reinforcing mechanism facing the battery cell, and the reinforcing mechanism adheres to the battery cell through the second adhesive portion.

4. The battery device according to claim 2, characterized in that, The reinforcing mechanism includes a wall panel and a hollow cavity enclosed by the wall panel that extends through the reinforcing mechanism in a first direction. The first adhesive portion is disposed between the wall panel and the side wall, and between the wall panel and the bottom wall.

5. The battery device according to claim 4, characterized in that, The wall panel includes a first sub-wall panel and a second sub-wall panel disposed opposite to each other in a second direction. The first sub-wall panel is bonded to the side wall through the first adhesive part. The first sub-wall panel has a dimension L1 in a third direction, and the second sub-wall panel has a dimension L2 in a third direction, which satisfies L1 > L2. The first direction, the second direction, and the third direction intersect each other.

6. The battery device according to claim 5, characterized in that, The wall panel further includes a third sub-wall panel and a fourth sub-wall panel disposed opposite to each other in the third direction. The third sub-wall panel is located between the fourth sub-wall panel and the bottom wall. The third sub-wall panel is connected to the first sub-wall panel and the second sub-wall panel. The fourth sub-wall panel is connected to the first sub-wall panel and the second sub-wall panel and is inclined relative to the first sub-wall panel toward the third sub-wall panel.

7. The battery device according to any one of claims 4-6, characterized in that, The reinforcing mechanism further includes reinforcing ribs, which are connected to the wall panel and extend in the hollow cavity along a second direction, wherein the first direction and the second direction intersect.

8. The battery device according to claim 1, characterized in that, The sidewall includes two first wall portions and two second wall portions connected to each other. The two first wall portions are arranged opposite each other along a second direction, and the two second wall portions are arranged opposite each other along a first direction. The first direction and the second direction intersect. The box also includes a mounting beam, which is disposed on the first wall portion. The reinforcing mechanism is connected to the first wall portion and the bottom wall.

9. The battery device according to claim 1, characterized in that, The bottom wall includes a protective plate and a heat exchange section stacked in its thickness direction. The heat exchange section is used to contain a heat exchange medium. The heat exchange section is disposed on the side of the protective plate facing the receiving cavity. The side wall and the reinforcing mechanism are disposed on the heat exchange section.

10. The battery device according to claim 1, characterized in that, The sidewall is made of metal, and the reinforcing mechanism is made of composite material.

11. An electrical appliance, characterized in that, Includes the battery device described in any one of claims 1-10.

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