Battery device and electric equipment

Abstract

The utility model relates to the technical field of batteries, in particular to a battery device and electric equipment. The battery device comprises a box body, a heating part, a supporting beam and a plurality of single batteries, a containing cavity is formed in the box body, the single batteries are arranged in the containing cavity, the heating part is arranged between the single batteries and the box body in the first direction and used for heating the single batteries, and the supporting beam is arranged in the containing cavity and divides the containing cavity into a plurality of cavities. First mounting holes communicated with the two adjacent cavities are formed in the supporting beams in a penetrating mode, and part of the heating pieces are arranged in the first mounting holes in a penetrating mode. According to the battery device, the heating piece can be used for heating the single battery and quickly heating the single battery, and meanwhile, the heating piece can penetrate into the other cavity from one cavity in the multiple cavities through the first mounting hole, so that the structural arrangement of the heating piece in the accommodating cavity is facilitated, the heating piece is protected through the supporting beam, and the service life of the battery device is prolonged. And the extrusion damage of the battery monomer or other parts to the heating piece is reduced.

Description

Technical Field

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

[0002] As the market share of new energy vehicles increases, new energy lithium batteries are favored by new energy vehicle companies due to their high energy density, fast charging capability and long cycle life. However, the low temperature environment makes it impossible for battery cells to enter fast charging quickly, so the battery cells need to be heated quickly at low temperature. Utility Model Content

[0003] In view of the defects of the prior art, the purpose of the present application is to provide a battery device and an electrical equipment, which can effectively solve the problem of rapid heating of battery cells.

[0004] The first aspect of the present application discloses a battery device, comprising:

[0005] A box body, wherein a receiving cavity is formed inside the box body;

[0006] A plurality of battery cells, wherein the plurality of battery cells are respectively arranged in the accommodating cavity;

[0007] A heating element, which is disposed between the battery cell and the box body along a first direction and is used to heat the battery cell;

[0008] A support beam is arranged in the accommodating cavity and divides the accommodating cavity into a plurality of cavities. A first mounting hole connecting two adjacent cavities is penetrated through the support beam, and part of the heating element is penetrated through the first mounting hole.

[0009] According to the battery device of the present application, by arranging the heating element between the battery cell and the box body along the first direction, the heating element can be used to heat the battery cell and quickly heat up the battery cell. At the same time, the heating element can pass through the first mounting hole from one cavity among the multiple cavities to another cavity, thereby facilitating the structural arrangement of the heating element in the accommodating cavity, and the heating element is protected by the support beam to reduce the squeezing damage to the heating element caused by the battery cell or other components in the box body.

[0010] In some embodiments of the present application, a first mounting hole is formed through an end surface of one side of the support beam close to the heating element along the first direction.

[0011] By setting the first mounting hole through the support beam toward the end surface of the heating element, it is convenient for the heating element to be inserted into the first mounting hole through the end surface of the support beam, thereby facilitating the assembly of the heating element and the support beam.

[0012] In some embodiments of the present application, the box body further includes a buffer component, which is disposed in the first mounting hole. A second mounting hole is penetrated through an end surface of the buffer component along the first direction close to the heating component, and part of the heating component is disposed through the second mounting hole.

[0013] By setting the second mounting hole through the buffer component toward the end surface of the heating component, the heating component can be easily inserted into the second mounting hole through the end surface of the buffer component, thereby facilitating the assembly of the heating component and the buffer component. At the same time, the buffer component can reduce the scratches between the heating component and the edge of the first mounting hole, and reduce the damage to the heating component caused by squeezing.

[0014] In some embodiments of the present application, the buffer member has a cross section perpendicular to the extension direction of the second mounting hole, and the size of the cross section gradually increases along the direction from the battery cell to the heating member.

[0015] By gradually increasing the size of the cross section along the direction from the battery cell to the heating element, the squeezing force on the heating element can be reduced, while the stability of fixing the heating element can be improved.

[0016] In some embodiments of the present application, the battery device also includes an insulating member, which is jointly arranged with the heating member between the battery cell and the box body along the first direction. The insulating member abuts against the box body on one side along the first direction, and abuts against the battery cell on the other side along the first direction.

[0017] By arranging the insulating member between the battery cell and the case along the first direction and respectively abutting against the battery cell and the case, the insulating member can support the battery cell and form a accommodating space for accommodating the heating element between the battery cell and the case, thereby reducing excessive squeezing of the heating element by the battery cell and the case and reducing damage to the heating element caused by excessive squeezing.

[0018] In some embodiments of the present application, the heating element includes a heating wire, the heating wire includes a plurality of heating segments arranged at intervals along a third direction, any heating segment extends along the second direction, the insulating element is arranged between two adjacent heating segments, and the first direction, the second direction and the third direction are perpendicular to each other.

[0019] By setting the heating element as a heating wire, the space occupied by the heating element in the accommodating cavity can be reduced due to the small radial dimension of the heating wire. At the same time, by arranging the insulating element between two adjacent heating sections, the space occupied by the insulating element in the accommodating cavity can be reduced, thereby facilitating the structural arrangement in the accommodating cavity.

[0020] In some embodiments of the present application, at least a portion of the battery cells are arranged along the second direction to form a battery cell assembly, and the heating section is thermally connected to any battery cell in the same battery cell assembly.

[0021] By arranging the battery cells in the battery cell assembly along the second direction and extending the heating section along the second direction, the heating section can be thermally connected to any battery cell in the same battery cell assembly, so that any battery cell in the battery cell assembly can be heated by the heating section, so that the battery cell is quickly heated. At the same time, the voltage difference between two adjacent battery cells in the same battery cell assembly is small, which can reduce the fire phenomenon in the heating section caused by the large voltage difference between different battery cells.

[0022] In some embodiments of the present application, the support beam extends along the second direction and divides the accommodating cavity into multiple cavities along the third direction, a battery cell is provided in any cavity, and the first mounting hole penetrates the support beam along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0023] The accommodating cavity is divided into a plurality of cavities for accommodating battery cells along a third direction by a support beam, and the heating element can pass through the first mounting hole from one of the plurality of cavities to another cavity, thereby heating the battery cells in different cavities, thereby improving the heating efficiency of the heating element.

[0024] In some embodiments of the present application, the support beam extends along the third direction and divides the accommodating cavity into multiple cavities along the second direction, wherein at least one cavity is provided with a battery cell, wherein at least another cavity is provided with an electronic control component, and the first mounting hole passes through the support beam along the second direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0025] The accommodating cavity is divided into at least one cavity for accommodating a battery cell and at least one cavity for accommodating an electronic control component along a second direction by a support beam. The heating element can pass through the first mounting hole from the cavity for accommodating a battery cell to the cavity for accommodating an electronic control component, thereby facilitating the arrangement of the structure of the heating element and improving the space utilization of the accommodating cavity.

[0026] In some embodiments of the present application, a portion of the box body is provided with a recessed portion along the first direction, and at least a portion of the heating element is provided in the recessed portion.

[0027] By arranging at least part of the heating element in the recessed portion, the space occupied by the heating element in the accommodating cavity can be reduced, thereby improving the space utilization of the accommodating cavity.

[0028] In some embodiments of the present application, a plurality of battery cells are bonded to the inner wall of the accommodation cavity on the same side along the first direction by adhesives.

[0029] By bonding the battery cell to the inner wall of the accommodating cavity with an adhesive, the fixation effect of the battery cell in the accommodating cavity can be improved, thereby reducing the risk of separation of the battery cell from the box body when the box body is impacted or shaken.

[0030] In some embodiments of the present application, the adhesive includes a thermally conductive structural adhesive, and at least a portion of the surface of the heating element facing the battery cell is coated with the thermally conductive structural adhesive.

[0031] By wrapping the thermally conductive structural adhesive on the surface of the heating element facing the battery cell, the heating element can be thermally connected to the battery cell through the thermally conductive structural adhesive, so that the heat generated by the heating element can be transferred to the battery cell through the thermally conductive structural adhesive, and the battery cell can be quickly heated up, while reducing the dry burning phenomenon of the heating element.

[0032] In some embodiments of the present application, the box body includes a box body, the box body includes a bottom plate and multiple side plates, one end of the multiple side plates along the first direction is respectively connected to the bottom plate, the bottom plate and the multiple side plates are jointly formed to form a accommodating cavity with an opening at one end, and the heating element is arranged between the battery cell and the bottom plate.

[0033] By bonding a plurality of battery cells to the bottom plate respectively, and arranging the bottom plate and the opening of the accommodating cavity opposite to each other, the assembly and bonding of the battery cells to the box body are facilitated.

[0034] The second aspect of the present application further proposes an electrical device, which includes any one of the above-mentioned battery devices.

[0035] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0037] Figure 1 is a schematic structural diagram of a vehicle provided by an embodiment of the present application;

[0038] Figure 2 is a schematic diagram of the exploded structure of a battery device provided in one embodiment of the present application;

[0039] Figure 3 is a schematic structural diagram of a battery cell assembly provided in one embodiment of the present application;

[0040] Figure 4 is a schematic diagram of the exploded structure of a battery cell provided in one embodiment of the present application;

[0041] Figure 5 It is a schematic diagram of the internal structure of the box body provided by one embodiment of the present application;

[0042] Figure 6 yes Figure 5 Schematic diagram of the assembly structure of the heating element and the support beam;

[0043] Figure 7 yes Figure 6 A schematic diagram of the enlarged structure of part A;

[0044] Figure 8 yes Figure 7 Schematic diagram of the structure of the buffer.

[0045] The reference numerals in the specific implementation manner are as follows:

[0046] 1. Vehicles;

[0047] 10. Battery device; 11. Controller; 12. Motor;

[0048] 20. Battery cell assembly; 21. Battery cell; 211. End cover; 212. Housing; 2121. First surface; 213. Electrode assembly; 214. Electrode terminal;

[0049] 30. Box body; 31. Box body; 311. Side plate; 312. Bottom plate; 313. Support beam; 3131. First mounting hole; 314. Buffer; 3141. Second mounting hole; 32. Cover plate;

[0050] 40. Heating element; 41. Heating section; 42. Bending section; 43. Connecting section;

[0051] 50. Insulation parts;

[0052] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0053] The following detailed description of the implementation of the technical solution of the present application is provided in conjunction with the accompanying drawings. The following implementation is only used to more clearly illustrate the technical solution of the present application, and is therefore only used as an example, and cannot be used to limit the scope of protection of the present application.

[0054] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0055] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0056] In addition, the technical terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0057] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0058] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0059] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. Lithium-ion batteries have been widely used in mobile and portable electrical appliances due to their high energy density, high average open circuit voltage and long cycle life.

[0060] As the market share of new energy vehicles increases, new energy lithium batteries are favored by new energy vehicle companies due to their high energy density, fast charging capability and long cycle life. However, the low temperature environment makes it impossible for battery cells to enter fast charging quickly, so the battery cells need to be heated quickly at low temperature.

[0061] In order to solve the problem of rapid heating of battery cells, the present application proposes a battery device and an electrical equipment including the battery device. According to the battery device of the present application, the battery cells can be quickly heated up by the heating element. At the same time, the structural arrangement of the heating element in the accommodating cavity is facilitated, and the extrusion damage to the heating element caused by the battery cells or other components in the box is reduced.

[0062] The battery device mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells may be connected in series, in parallel or in mixed connection through a busbar.

[0063] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0064] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0065] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0066] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0067] As an example, the box may include a first box and a second box. The first box and the second box are buckled together to form a closed space inside the box to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0068] As an example, the box body may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0069] As an example, the box body can be used as a part of the chassis structure of the vehicle. For example, the top cover of the box body can become at least a part of the floor of the vehicle, or the frame of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0070] In some embodiments, the battery device refers to an energy storage device, which includes a box body, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, and the like.

[0071] In some embodiments, the energy storage device includes one or more battery clusters to increase the voltage and capacity of the energy storage device. The battery cluster may include multiple battery modules, and the multiple battery modules are connected in series through a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0072] The energy storage device can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems or temporary power supply systems. The energy storage device can store electrical energy as needed and output electrical energy at an appropriate time. For example, the energy storage device can store electrical energy during low power consumption and provide electrical energy to relevant users or electrical equipment during peak power consumption. The energy storage system provided in the embodiments of the present application can be any power system that requires the use of an energy storage device.

[0073] The technical solutions described in the embodiments of the present application are applicable to various electrical devices and energy storage devices that use battery cells and battery devices, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships, spacecraft and energy storage containers, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0074] Figure 1 This is a schematic diagram of the structure of a vehicle 1 provided in some embodiments of the present application. Figure 1 As shown, the vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 10 is arranged inside the vehicle 1, and the battery device 10 can be arranged at the bottom, head or tail of the vehicle 1. The battery device 10 can be used to power the vehicle 1, for example, the battery device 10 can be used as an operating power source for the vehicle 1. The vehicle 1 can also include a controller 11 and a motor 12, and the controller 11 is used to control the battery device 10 to power the motor 12, for example, for the starting, navigation and working power requirements of the vehicle 1 during driving.

[0075] In some embodiments of the present application, the battery device 10 can be used not only as an operating power source for the vehicle 1 , but also as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0076] Figure 2 FIG. 1 is a schematic diagram of an exploded structure of a battery device 10 according to an embodiment of the present application. Figure 3FIG. 2 is a schematic diagram of the structure of a battery cell assembly 20 according to an embodiment of the present application. Figure 2 and Figure 3 As shown, in order to meet different power requirements, the battery device 10 may include a plurality of battery cells 21, where the battery cell 21 refers to the smallest unit constituting the battery device 10. The plurality of battery cells 21 may be connected in series and / or in parallel via electrode terminals for use in various applications. The plurality of battery cells 21 may be connected in series, in parallel, or in hybrid connection, where hybrid connection refers to a mixture of series connection and parallel connection.

[0077] Combination Figure 2 and Figure 3 As shown, the battery device 10 may include a plurality of battery cell assemblies 20 and a box 30, wherein the plurality of battery cell assemblies 20 are accommodated inside the box 30. The box 30 is used to accommodate the battery cell 21 or the battery cell assembly 20 to reduce the influence of liquid or other foreign matter on the charging or discharging of the battery cell 21. The box 30 may be a simple three-dimensional structure such as a single cuboid, cylinder or sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders or spheres. The material of the box 30 may be an alloy material such as aluminum alloy, iron alloy, etc., or a polymer material such as polycarbonate, polyisocyanurate foam plastic, or a composite material such as glass fiber and epoxy resin.

[0078] In some embodiments, the box body 30 may include a box body 31 and a cover plate 32, which cover each other, and the box body 31 and the cover plate 32 together define a space for accommodating the battery cell 21. The box body 31 may be a hollow structure with one end open, and the cover plate 32 may be a plate-like structure, which covers the open side of the box body 31, so that the box body 31 and the cover plate 32 together define a space for accommodating the battery cell 21.

[0079] The battery cell assembly 20 may include a plurality of battery cells 21. The plurality of battery cells 21 may be connected in series, in parallel, or in a mixed connection to form the battery cell assembly 20, and the plurality of battery cell assemblies 20 may be connected in series, in parallel, or in a mixed connection to form the battery device 10. The battery cell 21 may be cylindrical, flat, rectangular, or in other shapes, and the embodiments of the present application are not limited thereto. The battery cells 21 are generally divided into three types according to the packaging method: cylindrical battery cells, cubic battery cells, and soft-pack battery cells, and the embodiments of the present application are not limited thereto. However, for the sake of simplicity, the following embodiments are all described using a cubic lithium-ion battery cell 21 as an example.

[0080] Figure 4 The schematic diagram of the exploded structure of the battery cell 21 provided in some embodiments of the present application. The battery cell 21 refers to the smallest unit constituting the battery device 10. Figure 4The battery cell 21 includes an end cover 211 , a shell 212 and an electrode assembly 213 .

[0081] The end cap 211 refers to a component that covers the opening of the shell 212 to isolate the internal environment of the battery cell 21 from the external environment. Without limitation, the shape of the end cap 211 can be adapted to the shape of the shell 212 to match the shell 212. Optionally, the end cap 211 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 211 is not easily deformed when squeezed and collided, so that the battery cell 21 can have a higher structural strength and improved safety performance. Functional components such as electrode terminals 214 can be provided on the end cap 211. The electrode terminal 214 can be used to electrically connect to the electrode assembly 213 for outputting or inputting electrical energy of the battery cell 21. In some embodiments, the end cap 211 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 21 reaches a threshold. In some embodiments, an insulating member may be provided inside the end cap 211, and the insulating member may be used to isolate the electrical connection components in the housing 212 from the end cap 211 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, or the like.

[0082] The shell 212 is a component used to cooperate with the end cap 211 to form the internal environment of the battery cell 21, wherein the formed internal environment can be used to accommodate the electrode assembly 213, the electrolyte (not shown in the figure) and other components. The shell 212 and the end cap 211 can be independent components, and an opening can be set on the shell 212, and the internal environment of the battery cell 21 is formed by covering the opening with the end cap 211 at the opening. Without limitation, the end cap 211 and the shell 212 can also be integrated. Specifically, the end cap 211 and the shell 212 can form a common connection surface before other components are put into the shell, and when it is necessary to encapsulate the interior of the shell 212, the end cap 211 covers the shell 212. The shell 212 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 212 can be determined according to the specific shape and size of the electrode assembly 213. The material of the shell 212 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0083] The electrode assembly 213 is a component in the battery cell 21 where electrochemical reactions occur. One or more electrode assemblies 213 may be contained in the housing 212. The electrode assembly 213 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 213, and the parts of the positive and negative electrode sheets without active materials each constitute a tab (not shown in the figure). The positive tab and the negative tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tabs connect the electrode terminals 214 to form a current loop.

[0084] Combination Figures 2 to 7 As shown, the first aspect of the present application discloses a battery device 10. In some embodiments of the present application, the battery device 10 includes a box body 30, a heating element 40, a support beam 313 and a plurality of battery cells 21. A accommodating cavity is formed inside the box body 30, and a plurality of battery cells 21 are respectively arranged in the accommodating cavity. The heating element 40 is arranged between the battery cell 21 and the box body 30 along a first direction X, and is used to heat the battery cell 21. The support beam 313 is arranged in the accommodating cavity and divides the accommodating cavity into a plurality of cavities. A first mounting hole 3131 connecting two adjacent cavities is penetrated through the support beam 313, and part of the heating element 40 is penetrated through the first mounting hole 3131.

[0085] Specifically, the box body includes a box body 31 and a cover plate 32, which cover each other, and the box body 31 and the cover plate 32 jointly define a space for accommodating the battery cell 21. The box body 31 may be a hollow structure with one end open, and the cover plate 32 may be a plate-like structure, which covers the open side of the box body 31, so that the box body 31 and the cover plate 32 jointly define a space for accommodating the battery cell 21. The box body 31 includes a plurality of side plates 311, which are connected end to end in sequence and jointly surround a frame structure with two ends open, and the box body 31 also includes a bottom plate 312, which is arranged at one end opening of the frame structure and is used to block the corresponding opening, so that the box body 31 forms a hollow structure with one end open.

[0086] Multiple battery cells 21 are respectively arranged in the accommodating cavity. The multiple battery cells 21 can be arranged independently, or at least some of the multiple battery cells 21 can be connected in series, in parallel or mixed with each other to form a battery cell assembly 20.

[0087] The heating element 40 may be a heating tube, a heating film or a heating wire. For the convenience of description, this application only takes the heating element 40 as a heating wire as an example for explanation. The heating wire may also be called an electric heating wire or a heating wire. The radial dimension of the heating wire is much smaller than the outer contour dimension of the battery cell 21, and the radial dimension of the heating wire is generally greater than or equal to 0.1 mm and less than or equal to 7.0 mm. Optionally, the heating element 40 may be one of an iron-chromium-aluminum heating wire and a nickel-chromium heating wire. The heating element 40 may be arranged between the battery cell 21 and the bottom plate 312 of the box body 30 along the first direction X, so as to heat the battery cell 21 and quickly heat up the battery cell 21. Optionally, the first direction X may be the arrangement direction of the cover plate 32 toward the bottom plate 312, or the first direction X may be the arrangement direction between two side plates 311 arranged opposite to each other. For the convenience of description, in the embodiments of the present application, only the first direction X is taken as an example for the arrangement direction of the cover plate 32 and the bottom plate 312, and the heating element 40 is arranged between the bottom plate 312 and the battery cell 21 along the first direction X. Optionally, when the battery device 10 is used in an electrical device, the cover plate 32 and the bottom plate 312 can be arranged relative to each other in the vertical direction, and the first direction X can be the vertical direction.

[0088] The support beam 313 is arranged in the accommodating cavity, and one side of the support beam 313 along the first direction X is connected to the bottom plate 312, and the other side of the support beam 313 along the first direction X can abut against the cover plate 32, thereby forming a support structure in the accommodating cavity. When the cover plate 32 is connected to the box body 31, the support beam 313 abuts against the cover plate 32 on the other side of the first direction X, thereby being used to improve the support strength of the box body 30 and reduce the deformation of the box body 30. The support beam 313 can divide the accommodating cavity into a plurality of cavities, and the plurality of cavities may include a battery cavity for accommodating a battery cell 21, and the plurality of cavities may also include an electric control cavity for accommodating an electric control component. A first mounting hole 3131 connecting two adjacent cavities is provided through the support beam 313, and part of the heating element 40 is provided through the first mounting hole 3131.

[0089] According to the battery device 10 of the present application, by arranging the heating element 40 between the battery cell 21 and the box body 30 along the first direction X, the heating element 40 can be used to heat the battery cell 21 and quickly heat up the battery cell 21. At the same time, the heating element 40 can pass through the first mounting hole 3131 from one cavity among the multiple cavities to another cavity, thereby facilitating the structural arrangement of the heating element 40 in the accommodating cavity, and the heating element 40 is protected by the support beam 313 to reduce the extrusion damage to the heating element 40 caused by the battery cell 21 or other components in the box body 30.

[0090] Combination Figures 2 to 7 As shown, in some embodiments of the present application, a first mounting hole 3131 is formed through an end surface of one side of the support beam 313 along the first direction X close to the heating element 40 .

[0091] Specifically, a first mounting hole 3131 is provided through the side of the support beam 313 facing the bottom plate 312, so that a portion of the end surface of the support beam 313 facing the side of the bottom plate 312 is opened. For the convenience of description, this application only takes the example that the support beam 313 extends along the second direction Y, and the first mounting hole 3131 penetrates the support beam 313 along the third direction Z. Among them, the first direction X, the second direction Y and the third direction Z are perpendicular to each other. When the first direction X is a vertical direction, one of the second direction Y and the third direction Z can be the length direction of the battery device 10, and the other can be the width direction of the battery device 10, and the size of the battery device 10 along the length direction is greater than the size of the battery device 10 along the width direction. The projection of the first mounting hole 3131 on the support beam 313 along the third direction Z exceeds the end surface of the support beam 313 facing the bottom plate 312. When the first mounting hole 3131 penetrates the support beam 313 along the third direction Z, the first mounting hole 3131 penetrates the end surface of the support beam 313 facing the bottom plate 312, so that a portion of the end surface of the support beam 313 facing the bottom plate 312 is opened. When the battery device 10 is assembled, the heating element 40 can be first fixed to the side of the accommodating cavity close to the bottom plate 312, and then the support beam 313 and the box body 31 are assembled, and the heating element 40 is inserted into the first mounting hole 3131 through the end surface of the support beam 313, so as to facilitate the assembly of the heating element 40 and the support beam 313.

[0092] Combination Figures 2 to 8 As shown, in some embodiments of the present application, the box body 30 also includes a buffer member 314, which is disposed in the first mounting hole 3131, and a second mounting hole 3141 is penetrated through the end surface of the buffer member 314 along the first direction X close to the heating element 40, and part of the heating element 40 is passed through the second mounting hole 3141.

[0093] Specifically, the buffer 314 is inserted into the first mounting hole 3131, and a second mounting hole 3141 is provided through the end surface of the buffer 314 on one side close to the heating element 40 along the first direction X. The extension direction of the second mounting hole 3141 is consistent with the extension direction of the first mounting hole 3131. Since the first mounting hole 3131 penetrates the support beam 313 along the third direction Z, the second mounting hole 3141 penetrates the buffer 314 along the third direction Z. The projection of the second mounting hole 3141 on the buffer 314 along the third direction Z exceeds the end surface of the buffer 314 facing the bottom plate 312. When the second mounting hole 3141 penetrates the buffer 314 along the third direction Z, the second mounting hole 3141 penetrates the end surface of the buffer 314 facing the bottom plate 312, so that part of the end surface of the buffer 314 facing the bottom plate 312 is opened.

[0094] The buffer 314 has a certain deformation buffering effect, and the outer contour shape of the buffer 314 is adapted to the inner contour shape of the first mounting hole 3131. The outer contour size of the buffer 314 can be larger than the size of the first mounting hole 3131, so that the buffer 314 can be snapped into the first mounting hole 3131, thereby improving the fixing effect of the buffer 314. Part of the heating element 40 passes through the second mounting hole 3141 and is snapped into the second mounting hole 3141, thereby improving the positioning effect of the heating element 40. Optionally, the buffer 314 can be a rubber piece.

[0095] By setting the second mounting hole 3141 through the buffer component 314 toward the end surface of the heating component 40, the heating component 40 can be easily inserted into the second mounting hole 3141 through the end surface of the buffer component 314, thereby facilitating the assembly of the heating component 40 and the buffer component 314. At the same time, the buffer component 314 can reduce the scratches between the heating component 40 and the edge of the first mounting hole 3131, and reduce the damage of the heating component 40 caused by squeezing.

[0096] Combination Figures 2 to 8 As shown, in some embodiments of the present application, the buffer member 314 has a cross section perpendicular to the extension direction of the second mounting hole 3141 , and the size of the cross section gradually increases along the direction from the battery cell 21 to the heating member 40 .

[0097] Specifically, the second mounting hole 3141 extends along the third direction Z, and the buffer member 314 has a cross section perpendicular to the third direction Z. Optionally, the cross section of the buffer member 314 perpendicular to the third direction Z is a trapezoidal surface, and the size of the trapezoidal surface gradually increases along the direction from the support beam 313 to the bottom plate 312, thereby reducing the squeezing force on the heating element 40 and improving the stability of fixing the heating element 40.

[0098] Combination Figures 2 to 7 As shown, in some embodiments of the present application, the battery device 10 also includes an insulating member 50, and the insulating member 50 and the heating member 40 are jointly arranged between the battery cell 21 and the box body 30 along the first direction X, and the insulating member 50 abuts against the box body 30 on one side along the first direction X, and the insulating member 50 abuts against the battery cell 21 on the other side along the first direction X.

[0099] Specifically, the insulating member 50 is disposed between the battery cell 21 and the box body 30 along the first direction X, and is used to support the battery cell 21, so that the battery cell 21 is spaced from the bottom plate 312, and a receiving space for receiving the heating element 40 is formed between the battery cell 21 and the bottom plate 312. Among them, the insulating member 50 has a certain rigidity, so as to complete the support of the battery cell 21. Optionally, the insulating member 50 can be a mica sheet. Optionally, the size of the insulating member 50 along the first direction X is larger than the size of the heating element 40 along the first direction X, so as to reduce the extrusion of the battery cell on the heating element 40.

[0100] By arranging the insulating member 50 between the battery cell 21 and the case 30 along the first direction X and respectively abutting against the battery cell 21 and the case 30, the insulating member 50 can support the battery cell 21 and form a accommodating space for accommodating the heating element 40 between the battery cell 21 and the case 30, thereby reducing excessive squeezing of the heating element 40 by the battery cell 21 and the case 30 and reducing damage to the heating element 40 caused by excessive squeezing.

[0101] Combination Figures 2 to 7 As shown, in some embodiments of the present application, the heating element 40 includes a heating wire, the heating wire includes a plurality of heating segments 41 arranged at intervals along the third direction Z, any heating segment 41 extends along the second direction Y, the insulating member 50 is arranged between two adjacent heating segments 41, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0102] Specifically, the heating element 40 includes a plurality of heating segments 41, and the plurality of heating segments 41 are arranged at intervals along the third direction Z, and any heating segment 41 extends along the second direction Y. Optionally, the heating element 40 may be formed by bending a heating wire, and two adjacent heating segments 41 along the third direction Z may be connected by a bending segment 42. The bending segment 42 may be a straight line segment or an arc segment. Optionally, the insulating member 50 may be a strip structure extending along the second direction Y, and is arranged between two adjacent heating segments 41.

[0103] By setting the heating element 40 as a heating wire, the space occupied by the heating element 40 in the accommodating cavity can be reduced due to the small radial dimension of the heating wire. At the same time, the insulating element 50 is set between two adjacent heating sections 41, which can reduce the space occupied by the insulating element 50 in the accommodating cavity, thereby facilitating the structural arrangement in the accommodating cavity.

[0104] Combination Figures 2 to 7 As shown, in some embodiments of the present application, at least a portion of the battery cells 21 are arranged along the second direction Y to form a battery cell assembly 20, and the heating section 41 is thermally connected to any battery cell 21 in the same battery cell assembly 20.

[0105] Specifically, at least a portion of the battery cells 21 are arranged along the second direction Y and are connected in series, in parallel or in mixed connection to form a battery cell assembly 20. Any heating segment 41 is arranged corresponding to a battery cell 21 in the same battery cell assembly 20 along the first direction X and is thermally connected to the battery cell 21, so that any battery cell 21 in the same battery cell assembly 20 is heated separately by the heating segment 41.

[0106] By arranging the battery cells 21 in the battery cell assembly 20 along the second direction Y and extending the heating section 41 along the second direction Y, the heating section 41 can be thermally connected to any battery cell 21 in the same battery cell assembly 20, so that any battery cell 21 in the battery cell assembly 20 is heated by the heating section 41, so that the battery cell 21 is quickly heated. At the same time, the voltage difference between two adjacent battery cells 21 in the same battery cell assembly 20 is small, which can reduce the fire phenomenon of the heating section 41 caused by the large voltage difference between different battery cells 21.

[0107] Combination Figures 2 to 5 As shown, in some embodiments of the present application, the support beam 313 extends along the second direction Y and divides the accommodating cavity into multiple cavities along the third direction Z, and a battery cell 21 is respectively provided in any cavity. The first mounting hole 3131 penetrates the support beam 313 along the third direction Z, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0108] Specifically, the support beam 313 extends along the second direction Y and divides the accommodating cavity into a plurality of cavities along the third direction Z. The first mounting hole 3131 penetrates the support beam 313 along the third direction Z and is used to connect two adjacent cavities along the third direction Z.

[0109] Combination Figure 5 and Figure 6 As shown, due to the existence of the support beam 313, the support beam 313 divides the accommodating cavity into multiple cavities along the third direction Z, and a battery cell assembly 20 is respectively arranged in any cavity. By passing the heating element 40 through the first mounting hole 3131, the battery cell assemblies 20 on both sides of the support beam 313 along the third direction Z can be heated by one heating element 40. Optionally, the heating element 40 further includes a connecting section 43, which is a straight section and extends along the third direction Z. The connecting section 43 passes through the first mounting hole 3131 and is used to connect the heating sections 41 on both sides of the support beam 313.

[0110] The accommodating cavity is divided into multiple cavities for accommodating battery cells 21 along the third direction Z by the support beam 313. The heating element 40 can pass through the first mounting hole 3131 from one cavity among the multiple cavities to another cavity, thereby heating the battery cells 21 in different cavities, thereby improving the heating efficiency of the heating element 40.

[0111] Combination Figures 2 to 5As shown, in some embodiments of the present application, the support beam 313 extends along the third direction Z and divides the accommodating cavity into multiple cavities along the second direction Y, wherein at least one cavity is provided with a battery cell 21, wherein at least another cavity is provided with an electronic control component, and the first mounting hole 3131 passes through the support beam along the second direction Y, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0112] Specifically, the support beam 313 extends along the third direction Z and divides the accommodating cavity into a plurality of cavities along the second direction Y. The second mounting hole 3141 penetrates the support beam 313 along the second direction Y and is used to connect two adjacent cavities along the second direction Y.

[0113] The accommodating cavity is divided into at least one cavity for accommodating the battery cell 21 and at least one cavity for accommodating the electronic control component along the second direction Y by the support beam 313. The heating element 40 can pass through the first mounting hole 3131 from the cavity for accommodating the battery cell 21 to the cavity for accommodating the electronic control component, thereby facilitating the arrangement of the structure of the heating element 40 and improving the space utilization of the accommodating cavity.

[0114] Combination Figures 2 to 5 As shown, in some embodiments of the present application, part of the box body 30 is provided with a recessed portion along the first direction X, and at least part of the heating element 40 is disposed in the recessed portion.

[0115] Specifically, the heating element 40 is disposed between the battery cell 21 and the bottom plate 312, the bottom plate 312 is recessed in a direction away from the battery cell 21 to form a recessed portion, and at least part of the heating element 40 is disposed in the recessed portion. Optionally, the heating element 40 disposed in the accommodating cavity may be entirely disposed in the recessed portion.

[0116] By disposing at least a portion of the heating element 40 in the recessed portion, the space occupied by the heating element 40 in the accommodating cavity can be reduced, thereby improving the space utilization of the accommodating cavity.

[0117] Combination Figures 2 to 5 As shown, in some embodiments of the present application, a plurality of battery cells 21 are bonded to the inner wall of the accommodation cavity on the same side along the first direction X by adhesives.

[0118] Specifically, an adhesive is provided between the battery cell 21 and the bottom plate 312 along the first direction X, and the battery cell 21 is bonded to the bottom plate 312 by the adhesive, so that the battery cell 21 is fixed in the accommodating cavity. Since the heating element 40 is also provided between the battery cell 21 and the bottom plate 312, the heating element 40 can be fixedly connected to the accommodating cavity by the adhesive. Optionally, the heating element 40 can be a heating wire, and the heating wire is fixedly provided between the battery cell 21 and the bottom plate 312 by the adhesive. Since the radial dimension and volume of the heating wire are small, the space occupancy rate between the battery cell 21 and the bottom plate 312 can be reduced, thereby increasing the space occupancy rate of the adhesive between the battery cell 21 and the bottom plate 312, and then increasing the area of ​​direct bonding between the battery cell 21 and the bottom plate 312 by the adhesive. Among them, direct bonding by adhesive means that only an adhesive is provided between the battery cell 21 and part of the bottom plate 312, and does not include the presence of a heating wire in the adhesive.

[0119] By bonding the battery cell 21 to the inner wall of the accommodating cavity with an adhesive, the fixation effect of the battery cell 21 in the accommodating cavity can be improved, thereby reducing the risk of separation of the battery cell 21 from the box body 30 when the box body 30 is impacted or shaken.

[0120] Combination Figures 2 to 5 As shown, in some embodiments of the present application, the adhesive includes a thermally conductive structural adhesive, and at least a portion of the surface of the heating element 40 facing the battery cell 21 is coated with the thermally conductive structural adhesive.

[0121] Specifically, the adhesive includes a thermally conductive structural adhesive, which not only provides strong adhesion but also has good thermal conductivity. The thermally conductive structural adhesive is usually composed of a resin matrix and a filler, and the filler includes materials with excellent thermal conductivity such as aluminum nitride and boron nitride. Optionally, the adhesive can be a polyurethane thermally conductive structural adhesive or an epoxy resin thermally conductive structural adhesive. Among them, the adhesive covers the surface of the heating element 40 facing the battery cell 21, and the heating element 40 is thermally connected to the battery cell 21 through the adhesive. The heat generated when the heating element 40 is working first heats the adhesive, and the heated adhesive then heats the battery cell 21, thereby rapidly heating the battery cell 21.

[0122] By wrapping the thermally conductive structural adhesive on the surface of the heating element 40 facing the battery cell 21, the heating element 40 can be thermally connected to the battery cell 21 through the thermally conductive structural adhesive, so that the heat generated by the heating element 40 can be transferred to the battery cell 21 through the thermally conductive structural adhesive, and the battery cell 21 can be quickly heated up, while reducing the dry burning phenomenon of the heating element 40.

[0123] Combination Figures 2 to 5As shown, in some embodiments of the present application, the box body 30 includes a box body 31, the box body 31 includes a bottom plate 312 and multiple side plates 311, one end of the multiple side plates 311 along the first direction X is respectively connected to the bottom plate 312, the bottom plate 312 and the multiple side plates 311 are jointly formed to form a accommodating cavity with an opening at one end, and the heating element 40 is arranged between the battery cell 21 and the bottom plate 312.

[0124] Specifically, the opening of the accommodating cavity is arranged opposite to the bottom plate 312 along the first direction X, and the battery cell 21 can be placed in the accommodating cavity through the opening, so as to facilitate the installation of the battery cell 21. Optionally, the first direction X can be a vertical direction, and the opening of the accommodating cavity can be arranged above the bottom plate 312. Alternatively, the first direction X can be a vertical direction, and the opening of the accommodating cavity can be arranged below the bottom plate 312. The heating element 40 is arranged between the battery cell 21 and the bottom plate 312, so as to heat the battery cell 21 along the first direction X.

[0125] By bonding the plurality of battery cells 21 to the bottom plate 312 respectively, and the bottom plate 312 is arranged opposite to the opening of the accommodating cavity, the assembly and bonding of the battery cells 21 to the box body 30 are facilitated.

[0126] Combination Figures 2 to 5 As shown, in some embodiments of the present application, the battery cell 21 includes a first surface 2121 with the largest area, and the first surface 2121 is perpendicular to the second direction Y.

[0127] Specifically, the battery cell 21 includes a length direction, a width direction and a height direction, wherein the size of the battery cell 21 along the length direction and the size along the height direction are respectively larger than the size of the battery cell 21 along the width direction, and the surface where the length direction and the height direction of the battery cell 21 are located together is the first surface 2121 of the battery cell 21. Among them, the first surface 2121 is perpendicular to the second direction Y, that is, the first surfaces 2121 of two adjacent battery cells 21 are arranged relatively along the second direction Y, that is, the width direction of the battery cell 21 is consistent with the second direction Y. Optionally, when the battery cell 21 is a cubic battery cell, the first direction X can be the height direction of the battery cell, and the electrode terminal 214 is provided in the height direction of the battery cell 21. The second direction Y can be the width direction of the battery cell 21, and the battery cell 21 also includes a length direction, wherein the size of the battery cell 21 along the length direction is larger than the size of the battery cell 21 along the width direction.

[0128] By arranging the first surface 2121 perpendicularly to the second direction Y and arranging multiple battery cells 21 in the same battery cell assembly 20 along the second direction Y, the size of the battery cell 21 along the second direction Y can be reduced, thereby increasing the number of battery cells 21 arranged in the battery cell assembly 20 along the second direction Y.

[0129] like Figure 1 As shown, the second aspect of the present application proposes an electrical device, which includes the battery device 10 of any one of the above items.

[0130] Since the electrical equipment in the present application has the same technical features as the battery device 10 in any of the above embodiments and can achieve the same technical effects, it will not be described in detail here.

[0131] like Figure 1 As shown, in some embodiments of the present application, the electrical device may be a vehicle 1, and the vehicle 1 includes a battery device 10 of any of the above embodiments, and the battery device 10 is used to provide electrical energy for the vehicle 1 and to drive the vehicle 1 to move.

[0132] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below.

[0133] Combination Figures 2 to 8 As shown, in some embodiments of the present application, the battery device 10 includes a box body 30, a heating element 40, a support beam 313 and a plurality of battery cells 21. The box body 30 includes a box body 31, and the box body 31 includes a bottom plate 312 and a plurality of side plates 311. One end of the plurality of side plates 311 along the first direction X is respectively connected to the bottom plate 312, and the bottom plate 312 and the plurality of side plates 311 are jointly surrounded to form a receiving cavity with an opening at one end. The plurality of battery cells 21 are respectively arranged in the receiving cavity, and the heating element 40 is arranged between the battery cell 21 and the bottom plate 312 along the first direction X, and is used to heat the battery cell 21. Among them, the plurality of battery cells 21 are respectively bonded to the inner wall of the bottom plate 312 by an adhesive on the same side along the first direction X. The adhesive includes a heat-conducting structural adhesive, and at least part of the surface of the heating element 40 facing the battery cell 21 is coated with a heat-conducting structural adhesive. The bottom plate 312 is provided with a recessed portion along the first direction X, and the heating element 40 is arranged in the recessed portion.

[0134] The support beam 313 is arranged in the accommodating cavity, and the support beam 313 extends along the second direction Y, and divides the accommodating cavity into multiple cavities along the third direction Z. Multiple battery cells 21 are respectively arranged in any cavity, and multiple battery cells 21 in the same cavity are arranged along the second direction Y to form a battery cell assembly 20. Among them, the first direction X, the second direction Y and the third direction Z are perpendicular to each other. A first mounting hole 3131 is penetrated along the third direction Z on the support beam 313 to connect two adjacent cavities, and the first mounting hole 3131 penetrates the end surface of one side of the support beam 313 close to the heating element 40 along the first direction X. The box body 30 also includes a buffer 314, which is arranged in the first mounting hole 3131. The buffer 314 is penetrated along the third direction Z. A second mounting hole 3141 is penetrated in the buffer 314 along the third direction Z, and the second mounting hole 3141 penetrates the end surface of one side of the buffer close to the heating element 40 along the first direction X, and part of the heating element 40 is penetrated in the second mounting hole 3141. The buffer member 314 has a cross section perpendicular to the extending direction of the second mounting hole 3141 , and the size of the cross section gradually increases along the direction from the battery cell 21 to the heating member 40 .

[0135] The heating element 40 includes a heating wire, which includes a plurality of heating segments 41 spaced apart along the third direction Z. Any heating segment 41 extends along the second direction Y and is thermally connected to any battery cell 21 in the same battery cell assembly 20 .

[0136] The battery device 10 also includes an insulating member 50, which is jointly arranged with the heating member 40 between the battery cell 21 and the bottom plate 312 along the first direction X. The insulating member 50 abuts against the bottom plate 312 on one side along the first direction X, and abuts against the battery cell 21 on the other side along the first direction X, and the insulating member 50 is arranged between two adjacent heating sections 41.

[0137] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the various embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: include: A box body, wherein a receiving cavity is formed inside the box body; A plurality of battery cells, wherein the plurality of battery cells are respectively arranged in the accommodating cavity; A heating element, the heating element is disposed between the battery cell and the box along a first direction and is used to heat the battery cell; A support beam is disposed in the accommodating cavity and divides the accommodating cavity into a plurality of cavities. A first mounting hole connecting two adjacent cavities is penetrated through the support beam, and part of the heating element is penetrated through the first mounting hole.

2. The battery device according to claim 1, characterized in that: The first mounting hole is formed through an end surface of one side of the support beam close to the heating element along the first direction.

3. The battery device according to claim 2, characterized in that: The box body also includes a buffer component, which is arranged in the first mounting hole. A second mounting hole is penetrated by an end surface of the buffer component along the first direction close to the heating component, and part of the heating component is inserted into the second mounting hole.

4. The battery device according to claim 3, characterized in that: The buffer member has a cross section perpendicular to an extending direction of the second mounting hole, and a size of the cross section gradually increases along a direction from the battery cell to the heating member.

5. The battery device according to any one of claims 1 to 4, characterized in that: The battery device further includes an insulating member, which is disposed together with the heating member between the battery cell and the box along the first direction. One side of the insulating member along the first direction abuts against the box, and the other side of the insulating member along the first direction abuts against the battery cell.

6. The battery device according to claim 5, characterized in that: The heating element includes a heating wire, which includes a plurality of heating segments arranged at intervals along a third direction, any one of the heating segments extends along a second direction, the insulating element is arranged between two adjacent heating segments, and the first direction, the second direction and the third direction are perpendicular to each other.

7. The battery device according to claim 6, characterized in that: At least a portion of the battery cells are arranged along the second direction to form a battery cell assembly, and the heating section is thermally connected to any one of the battery cells in the same battery cell assembly.

8. The battery device according to any one of claims 1 to 4, characterized in that: The support beam extends along the second direction and divides the accommodating cavity into a plurality of cavities along the third direction. The battery cell is respectively arranged in any one of the cavities. The first mounting hole penetrates the support beam along the third direction. The first direction, the second direction and the third direction are perpendicular to each other.

9. The battery device according to any one of claims 1 to 4, characterized in that: The support beam extends along the third direction and divides the accommodating cavity into a plurality of cavities along the second direction, wherein at least one of the cavities is provided with the battery cell, wherein at least another of the cavities is provided with an electronic control component, and the first mounting hole penetrates the support beam along the second direction, and the first direction, the second direction and the third direction are perpendicular to each other.

10. The battery device according to any one of claims 1 to 4, characterized in that: Part of the box body is provided with a recessed portion along the first direction, and at least part of the heating element is arranged in the recessed portion.

11. The battery device according to any one of claims 1 to 4, characterized in that: The plurality of battery cells are bonded to the inner wall of the accommodation cavity on the same side along the first direction by adhesive.

12. The battery device according to claim 11, characterized in that: The adhesive comprises a heat-conducting structural adhesive, and at least a portion of the surface of the heating element facing the battery cell is coated with the heat-conducting structural adhesive.

13. The battery device according to any one of claims 1 to 4, characterized in that: The box body includes a box body, and the box body includes a bottom plate and multiple side plates. One end of the multiple side plates along the first direction is respectively connected to the bottom plate. The bottom plate and the multiple side plates are jointly surrounded to form the accommodating cavity with an opening at one end. The heating element is arranged between the battery cell and the bottom plate.

14. An electrical device, characterized in that: A battery device comprising any one of claims 1 to 13.

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