Battery device, electric device, and method for manufacturing battery device

Abstract

The embodiment of the application provides a battery device, a power utilization device and a manufacturing method of the battery device, and belongs to the technical field of batteries, wherein the battery device comprises a battery monomer assembly and a box. The battery monomer assembly comprises a plurality of battery monomers; the box contains the battery monomer assembly, and the box comprises a first box wall, the first box wall has a first surface facing the battery monomer assembly; wherein a heating coating is arranged on the first surface, the heating coating is formed on the first surface in a printing or coating mode and directly contacts the first surface, and the heating coating is configured to be electrifiable to heat the battery monomers. The technical scheme provided by the application can improve the reliability of the battery device.

Description

Technical Field

[0001] This application relates to the field of batteries, and more specifically, to a battery device, an electrical device, and a method for manufacturing the battery device. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] Improving the reliability of battery devices is a pressing issue in battery technology. Summary of the Invention

[0004] This application provides a battery device, an electrical device, and a method for manufacturing a battery device, which can improve the reliability of the battery device.

[0005] In a first aspect, embodiments of this application provide a battery device, including a battery cell assembly and a housing. The battery cell assembly includes a plurality of battery cells; the housing houses the battery cell assembly, and the housing includes a first housing wall having a first surface facing the battery cell assembly; wherein a heating coating is disposed on the first surface, formed on the first surface by printing or coating, and the heating coating is in direct contact with the first surface, and the heating coating is configured to be electrically conductive to heat the battery cells.

[0006] In the above technical solution, by setting a heating coating on the first surface, the battery cells are heated to manage their temperature, thereby reducing the risk of excessively low battery cell temperatures and improving the reliability of the battery device. Simultaneously, since the heating coating is applied to the first surface in direct contact with it, compared to the case where an electric heating film is placed between the first surface and the battery cell assembly, on the one hand, the gap between the heating structure and the first surface is reduced, allowing more space within the housing to accommodate the battery cells, thus improving the volumetric energy density of the battery device; on the other hand, the connection strength between the heating coating and the first surface is improved, reducing the risk of the heating coating detaching from the battery cell surface due to high temperature or causing dry burning of the heating coating on the first surface, thereby improving the reliability of the battery device.

[0007] In some embodiments, at least a portion of the heating coating is in direct contact with the battery cell.

[0008] In the above technical solution, at least part of the heating coating is in direct contact with the battery cell. On the one hand, this facilitates the transfer of heat generated by the heating coating when energized to the battery cell, thereby enabling the heating coating to manage the temperature of the battery cell and reducing the risk of the battery cell temperature being too low. On the other hand, the direct contact between the heating coating and the battery cell, compared to the case where an insulating film is sandwiched between the heating structure and the battery cell in the electric heating film, reduces the risk of the insulating film curling up at high temperatures and detaching from the surface of the battery cell, leading to the heating coating burning out, thereby further improving the reliability of the battery device.

[0009] In some embodiments, the heating coating includes carbon-based materials, graphene composite materials, and metallic materials.

[0010] In the above technical solutions, carbon-based materials (such as carbon fibers and carbon nanotubes) have high electrical resistance, enabling the heating coating to reach the predetermined temperature quickly after energization. This facilitates timely temperature control of individual battery cells, thereby reducing the risk of excessively low cell temperatures. Graphene composite materials possess extremely high electrical and thermal conductivity, which helps improve the temperature uniformity of the heating coating, further reducing the risk of thermal runaway of individual battery cells due to locally high temperatures in the heating coating. Metallic materials are readily available and provide the heating coating with a certain structural strength. Furthermore, since carbon-based materials, graphene composite materials, and metallic materials all possess good toughness, mixing and coating carbon-based slurry, graphene composite slurry, and metallic slurry onto the first surface to form a heating coating improves the flexibility of the heating coating, reducing the risk of the heating coating detaching from the first surface, thereby further enhancing the reliability of the battery device.

[0011] In some embodiments, the first box wall is a bottom plate, which is used to support the battery cell assembly.

[0012] In the above technical solution, by setting the first box wall as the bottom plate and supporting the battery cell assembly, i.e., the first surface is located below the battery cell assembly, the bottom of the battery cell will be heated when the heating coating is energized, and the air at the bottom of the battery cell will be heated and rise, so as to form convection with the air at the top of the battery cell in the direction of gravity. This facilitates the uniform rise of the temperature inside the box, thereby reducing the risk of uneven temperature inside the battery device and improving the reliability of the battery device.

[0013] In some embodiments, the battery cell assembly includes at least one column of battery cells, each column of battery cells including a plurality of battery cells arranged along a first direction, the first direction being perpendicular to the surface of the battery cell with the largest area; the first surface includes a first region overlapping the battery cell assembly, and the heating coating is disposed in the first region; the first region includes a first end region, a middle region and a second end region sequentially distributed along the first direction, the resistance of the heating coating located in the middle region is less than the resistance of the heating coating located in the first end region, and the resistance of the heating coating located in the middle region is less than the resistance of the heating coating located in the second end region.

[0014] In the above technical solution, by setting the resistance of the heating coating located in the middle region to be less than that of the heating coating located in the first end region and the second end region, the heat energy generated by the heating coating located in the middle region is less than that generated by the heating coating located in the first end region and the second end region. As a result, the heat energy provided by the heating coating to the battery cell located in the middle of the battery cell assembly in the first direction is less than the heat energy provided by the heating coating to the battery cells located at both ends of the battery cell assembly in the first direction. This makes the temperature distribution of the battery cells in the battery cell assembly more uniform, reduces the risk of heat concentration in the battery cells located in the middle of the battery cell assembly in the first direction, and improves the reliability of the battery device.

[0015] In some embodiments, the heated coating includes at least one meandering, extending texture.

[0016] In the above technical solution, by setting the heating coating as at least one meandering and extending texture, compared to setting the heating coating as a plate-like structure covering part of the first surface, on the one hand, the length of the current path is increased while the current flow area is reduced, which helps to increase the resistance of the heating coating and thus improve the heating efficiency of the heating coating. This is beneficial for the heating coating to manage the temperature of the battery cells, thereby reducing the risk of the battery cells being too cold. On the other hand, it reduces the risk of uneven current distribution, thereby reducing the risk of severe uneven heating caused by the heating coating current being too high in some areas and too low in most areas, thus improving the reliability of the battery device.

[0017] In some embodiments, the ratio of the area of ​​the texture located in the central region to the area of ​​the central region is less than the ratio of the area of ​​the texture located in the first end region to the area of ​​the first end region; the ratio of the area of ​​the texture located in the central region to the area of ​​the central region is less than the ratio of the area of ​​the texture located in the second end region to the area of ​​the second end region.

[0018] In the above technical solution, the ratio of the area of ​​the texture in the central region to the area of ​​the central region is less than the ratio of the area of ​​the texture in the first and second end regions to the area of ​​the first and second end regions. Therefore, while maintaining the width and thickness of the texture, the length of the texture in the central region is less than the length of the texture in the first and second end regions, resulting in a lower resistance of the texture in the central region compared to the texture in the first and second end regions. Consequently, the heat energy provided by the heating coating to the battery cells located in the middle of the battery cell assembly in the first direction is less than the heat energy provided by the heating coating to the battery cells located at both ends of the battery cell assembly in the first direction. This leads to a more uniform temperature distribution among the battery cells in the battery cell assembly, reducing the risk of heat concentration in the battery cells located in the middle of the battery cell assembly in the first direction and improving the reliability of the battery device.

[0019] In some embodiments, the width of the texture located in the central region is greater than the width of the texture located in the first end region; the width of the texture located in the central region is greater than the width of the texture located in the second end region.

[0020] In the above technical solution, the width of the texture in the central region is greater than the width of the texture in the first and second end regions. Therefore, under the premise that the texture thickness remains constant and the texture length in each region is the same, the cross-sectional area of ​​the texture in the central region is greater than that of the texture in the first and second end regions. Consequently, the resistance of the texture in the central region is less than that of the texture in the first and second end regions. This results in the heating coating providing less heat to the battery cells located in the middle of the battery cell assembly in the first direction than it provides to the battery cells located at both ends of the battery cell assembly in the first direction. This leads to a more uniform temperature distribution among the battery cells in the battery cell assembly, reducing the risk of heat concentration in the battery cells located in the middle of the battery cell assembly in the first direction and improving the reliability of the battery device.

[0021] In some embodiments, the thickness of the texture located in the central region is greater than the thickness of the texture located in the first end region; the thickness of the texture located in the central region is greater than the thickness of the texture located in the second end region.

[0022] In the above technical solution, the thickness of the texture located in the middle region is greater than the thickness of the texture located in the first end region and the second end region, so that on the premise that the width of the texture remains unchanged and the length of the texture in each region is the same, the cross-sectional area of the texture located in the middle region is larger than the cross-sectional area of the texture located in the first end region and the second end region, and further the resistance of the texture located in the middle region is smaller than the resistance of the texture located in the first end region and the second end region. As a result, the thermal energy provided by the heating coating to the battery cells located in the middle of the battery cell assembly in the first direction is less than the thermal energy provided by the heating coating to the battery cells located at both ends of the battery cell assembly in the first direction, so that the temperature distribution of the battery cells in the battery cell assembly is more uniform, the risk of thermal concentration of the battery cells located in the middle of the battery cell assembly in the first direction is reduced, and the reliability of the battery device is improved.

[0023] In some embodiments, the side of the battery cell facing the bottom plate includes a contact region in direct contact with the heating coating and a non-contact region not in contact with the heating coating; the battery device further includes an adhesive layer, and the non-contact region is adhered to the bottom plate through the adhesive layer.

[0024] In the above technical solution, the contact region of the battery cell is brought into direct contact with the heating coating, so that the thickness of the adhesive layer can be adjusted by adjusting the thickness of the heating coating, which is beneficial to adjusting the connection strength between the battery cell and the box body, and is beneficial to controlling the distance between the battery cell and the first surface, so that more space in the box body can be used for accommodating the battery cell, which is beneficial to improving the volumetric energy density of the battery device, and further improves the volumetric energy density of the battery device while enhancing the reliability of the battery device.

[0025] In some embodiments, the bottom plate is provided with an electrical connector, and the heating coating is electrically connected to the electrical connector.

[0026] In the above technical solution, by providing the electrical connector, it is convenient to supply electric energy to the heating coating, and the structure is simple and easy to implement.

[0027] In some embodiments, the battery cell is electrically connected to the heating coating, and the battery cell is configured to supply electric energy to the heating coating.

[0028] In the above technical solution, the battery cell supplies electric energy to the heating coating, so that compared with the case of an external power supply, an external high-voltage interface, an external power line, a connector and related safety isolation devices are omitted. The structures matched with the heating coating are completely built in the box body, which improves the structural compactness of the battery device, is beneficial to the overall packaging and sealing design of the battery device, and thus improves the reliability of the battery device.

[0029] Secondly, embodiments of this application also provide an electrical device, including the battery device provided in any of the embodiments of the first aspect, wherein the battery device is used to provide electrical energy.

[0030] Thirdly, embodiments of this application also provide a method for manufacturing a battery device, comprising forming a heating coating on a first surface of a first wall of a housing by a printing process; and loading a battery cell into the housing such that at least a portion of the heating coating is in direct contact with the battery cell.

[0031] In the above technical solution, a heating coating is formed on the first surface through a printing process. Compared with the case where an electric heating film is placed between the first surface and the battery cell assembly, on the one hand, the gap between the heating structure and the first surface is reduced, which allows more space in the housing to be used to accommodate the battery cells, thereby improving the volumetric energy density of the battery device. On the other hand, the connection strength between the heating structure and the first surface is improved, thereby reducing the risk of the heating coating peeling off the surface of the battery cell due to high temperature or the heating coating drying out due to the first surface, thus improving the reliability of the battery device.

[0032] In some embodiments, the first box wall is a bottom plate; after the heating coating is formed and before the battery cells are installed into the box, the manufacturing method further includes: coating the first surface with an adhesive layer.

[0033] In the above technical solution, by coating an adhesive layer on the first surface and then connecting the battery cell and the first surface through the adhesive layer, and since the heating coating is printed on the first surface, an electric heating film is set between the first surface and the battery cell assembly, the battery cell can be connected to the heating coating through the adhesive layer to indirectly connect with the first surface, thereby improving the connection strength between the battery cell and the first surface and thus improving the reliability of the battery device.

[0034] In some embodiments, the formation of a heat-generating coating on the first surface of the first wall of the housing by a printing process includes forming the heat-generating coating on the first surface of the first wall of the housing by a screen printing process.

[0035] In the above technical solution, a heating coating is formed on the first surface of the first wall of the housing by screen printing. This allows for adjustment of the width, thickness, and length of the heating coating in different areas by adjusting the structure of the screen, thereby facilitating the adjustment of the resistance of the heating coating in different areas and improving the reliability of the battery device. Attached Figure Description

[0036] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments; Figure 2 Exploded views of the structure of the battery device provided in some embodiments of this application; Figure 3 Exploded views of the structure of a single battery cell provided in some embodiments of this application; Figure 4 A cross-sectional view of the first box wall provided for some embodiments of this application; Figure 5 A cross-sectional view of a battery device provided for some embodiments of this application; Figure 6 A schematic diagram of the structure of a first box body provided for some embodiments of this application; Figure 7 A schematic diagram of the structure of a first box body in another direction provided for some embodiments of this application; Figure 8 This is a schematic diagram of another first box body provided in some embodiments of this application; Figure 9 A cross-sectional view of yet another first box body provided for some embodiments of this application; Figure 10 A cross-sectional view of another battery device provided for some embodiments of this application.

[0038] Icons: 1000 - Vehicle; 100 - Battery Unit; 10 - Housing; 10A - Battery Chamber; 10B - Electrical Chamber; 11 - First Housing Body; 111 - Base Plate; 1111 - First Surface; 11110 - First Region; 1111A - First End Region; 11111 - First Sub-Region; 1111B - Middle Region; 1111C - Second End Region; 11112 - Second Sub-Region; 112 - Frame; 113 - First Housing Wall; 1131 - Body; 1132 - Insulating Coating; 114 - Heating Coating; 1140 - Texture; 1141 - First Segment; 1141A - First End; 1141B - Second End; 1142 - Second Segment; 1143 - Third Segment; 115 - Separator Beam; 116 - Adhesive Layer; 117 - Electrical Connector; 12 - Second Housing Body; 20 - Battery cell assembly; 21 - Battery cell; 21A - Contact area; 21B - Non-contact area; 211 - End cap; 212 - Housing; 213 - Electrode assembly; 214 - Insulating component; 30 - Thermally conductive adhesive layer; 200 - Controller; 300 - Motor; X - First direction; Y - Second direction; Z - Thickness direction of the base plate. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0041] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0042] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0043] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0044] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0045] In this application, "multiple" means two or more (including two).

[0046] 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.

[0047] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0048] In related technologies, a battery cell generally includes a casing and an electrode assembly. The casing may include a housing and an end cap. The housing has an opening. After the electrode assembly is installed inside the housing, the opening of the housing can be closed by the end cap to form a sealed space inside the housing to accommodate the electrode assembly.

[0049] The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, placed between the positive and negative electrodes, reduces the risk of short circuits while allowing active ions to pass through.

[0050] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0051] In some implementations, the electrode assembly is a stacked structure.

[0052] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0053] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0054] The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing can be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0055] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0056] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0057] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0058] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0059] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0060] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0061] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0062] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0063] The following discussion will primarily focus on rectangular battery cells. It should be understood that the embodiments described below are also applicable in some respects to cylindrical battery cells, pouch cell cells, or blade cell cells.

[0064] The development of battery technology must take into account multiple design factors, such as energy density, cycle life, discharge capacity, charge-discharge rate and other performance parameters. In addition, battery reliability also needs to be considered.

[0065] When battery devices are used in low ambient temperatures, the performance of the electrolyte inside the battery cells deteriorates, slowing down the rate of chemical reactions within the cells. This leads to a decrease in the battery's capacitance, with the capacity decreasing as the ambient temperature drops. It also reduces the charging and discharging speeds of the battery cells. Therefore, it is necessary to raise the temperature of the battery cells in low-temperature environments. Some battery devices use a heating film on one side of the battery cells to convert electrical energy into heat to raise the cell temperature. During heating, the PI (Polyimide Film) films on both sides of the heating film may curl and detach from the battery cells due to high temperatures, potentially causing the heating film to burn out and affecting the reliability of the battery device.

[0066] Based on the above considerations, in order to improve the reliability of the battery device, this application provides a battery device including a battery cell assembly and a housing. The battery cell assembly includes a plurality of battery cells; the housing houses the battery cell assembly and includes a first housing wall having a first surface facing the battery cell assembly; wherein a heating coating is disposed on the first surface, the heating coating being formed on the first surface by printing or coating and in direct contact with the first surface, and the heating coating being configured to be electrically energized to heat the battery cells.

[0067] In this battery device structure, a heating coating is applied to the first surface to heat the individual battery cells, thereby managing their temperature and reducing the risk of excessively low cell temperatures, thus improving the reliability of the battery device. Furthermore, since the heating coating is applied directly to the first surface, compared to a heating film placed between the first surface and the battery cell assembly, it reduces the gap between the heating structure and the first surface, allowing more space within the housing to accommodate the battery cells, thus increasing the volumetric energy density of the battery device. Additionally, it strengthens the connection between the heating coating and the first surface, reducing the risk of the heating coating detaching from the battery cell surface due to high temperatures or causing dry burning of the heating coating on the first surface, thereby improving the reliability of the battery device.

[0068] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.

[0069] Electrical devices can include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0070] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000; for example, the battery device 100 can serve as the operating power source or general power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 controls the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0071] In some embodiments of this application, the battery device 100 can not only serve as the operating power or power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0072] To meet different power demands, the battery device 100 may include multiple battery cells 21, which can be connected in series, parallel, or in a mixed configuration. The battery device 100 may also be referred to as a battery pack. Optionally, the multiple battery cells 21 can first be connected in series, parallel, or in a mixed configuration to form a battery cell assembly 20, and then the multiple battery cell assemblies 20 can be connected in series, parallel, or in a mixed configuration to form the battery device 100. That is, the multiple battery cells 21 can directly form the battery device 100, or they can first be formed into battery cell assemblies 20, and then the battery cell assemblies 20 can be formed into the battery device 100.

[0073] For example, please refer to Figure 2 , Figure 2 The following is an exploded view of the structure of a battery device 100 according to some embodiments of this application. The battery device 100 may include a plurality of battery cells 21. The battery device 100 may also include a housing 10, which has a hollow interior structure, and the plurality of battery cells 21 are housed within the housing 10.

[0074] Optionally, the battery device 100 may also include other structures, which will not be described in detail here. For example, the battery device 100 may also include a busbar component for electrically connecting multiple battery cells 21, such as in parallel, series, or mixed connections. Specifically, the busbar component can achieve electrical connection between battery cells 21 by connecting the electrode terminals of the battery cells 21. Further, the busbar component can be fixed to the electrode terminals of the battery cells 21 by welding. The electrical energy of the multiple battery cells 21 can be further led out through the housing 10 via a conductive mechanism.

[0075] The number of battery cells 21 can be set to any value depending on different power requirements. Multiple battery cells 21 can be connected in series, parallel, or mixed connections to achieve a larger capacity or power. Since each battery device 100 may include a large number of battery cells 21, for ease of installation, the battery cells 21 can be grouped, with each group of battery cells 21 forming a battery cell assembly 20. The number of battery cells 21 included in a battery cell assembly 20 is unlimited and can be set according to requirements. The battery device 100 may include multiple battery cell assemblies 20, which can be connected in series, parallel, or mixed connections.

[0076] Please refer to Figure 2 Please refer to Figure 3 and Figure 4 , Figure 3 This is an exploded view of the structure of a battery cell 21 provided in some embodiments of this application. Figure 4 This is a cross-sectional view of the first housing wall 113 provided in some embodiments of this application. Embodiments of this application provide a battery device 100, including a battery cell assembly 20 and a housing 10. The battery cell assembly 20 includes a plurality of battery cells 21; the housing 10 houses the battery cell assembly 20 and includes a first housing wall 113 having a first surface 1111 facing the battery cell assembly 20; wherein a heating coating 114 is provided on the first surface 1111, the heating coating 114 being formed on the first surface 1111 by printing or coating and directly contacting the first surface 1111, and the heating coating 114 being configured to be electrically conductive to heat the battery cells 21.

[0077] The battery cell 21 generally includes a housing and an electrode assembly 213. The housing may include a casing 212 and an end cap 211. The casing 212 has an opening. After the electrode assembly 213 is installed in the casing 212, the opening of the casing 212 can be closed by the end cap 211 to form a sealed space inside the casing to accommodate the electrode assembly 213.

[0078] Please refer to Figure 2In some embodiments, the battery device 100 further includes a housing 10 having a accommodating cavity for accommodating battery cell assemblies 20, as shown in the figure. These are referred to here as a first housing body 11 and a second housing body 12, which are fastened together. The shapes of the first housing body 11 and the second housing body 12 can be determined according to the shape of the combination of multiple battery cells 21. Both the first housing body 11 and the second housing body 12 may have an open surface. For example, both the first housing body 11 and the second housing body 12 can be hollow cuboids with only one open surface each. The open surfaces of the first housing body 11 and the second housing body 12 are arranged opposite to each other, and the first housing body 11 and the second housing body 12 are fastened together to form a housing 10 with a closed cavity. Multiple battery cells 21 are connected in parallel, series, or mixed configurations and placed within the housing 10 formed by the fastening of the first housing body 11 and the second housing body 12. The housing 10 has a accommodating cavity for accommodating the battery cell assembly 20, thereby providing the battery cell assembly 20 with a stable operating environment and improving the reliability of the battery device 100.

[0079] The first box wall 113 is a wall portion of the box body 10. For example, the first box wall 113 can be a side wall of the box body 10, or the first box wall 113 can be the bottom plate 111 of the box body 10, or the first box wall 113 can be the end cap 211 of the box body 10.

[0080] In some embodiments, the housing 10 includes a base plate 111 and a frame 112. The frame 112 is arranged around the edge of the base plate 111 to form the housing 10. A partition beam 115 is provided inside the housing 10 to divide the interior of the housing 10 into a battery cavity 10A for accommodating the battery cell assembly 20 and an electrical cavity 10B for accommodating electrical structural components.

[0081] For example, the first box wall 113 can be a side wall of the frame 112, or the first box wall 113 can be a bottom plate 111, or the first box wall 113 can be a partition beam 115.

[0082] The first surface 1111 refers to the surface of the first housing wall 113 facing the battery cell assembly 20. Exemplarily, the first surface 1111 is the surface of the first housing wall 113 used to enclose the surfaces of other housing walls to form the battery cavity 10A.

[0083] The heating coating 114 refers to a continuous covering layer formed on the first surface 1111 by physical, chemical, or mechanical methods. This layer is capable of conducting electricity to generate heat and thus raising the temperature of the battery cell 21. This covering layer is bonded to the first surface 1111 through some form of interface, becoming part of the first casing wall 113. This enhances the structural strength of the heating structure, eliminating the need for additional structures (such as a PI film) to reduce the risk of damage during transportation.

[0084] For example, the heating coating 114 is made of a conductive material, such as a metal or conductive ceramic.

[0085] Understandably, the first box wall 113 is insulated from the heating coating 114.

[0086] In some embodiments, the first box wall 113 is made entirely of insulating material.

[0087] In some embodiments, refer to Figure 4 The first box wall 113 includes a body 1131 and an insulating coating 1132. The body 1131 is coated with the insulating coating 1132 on one side in its thickness direction. The surface of the insulating coating 1132 away from the body 1131 is the first surface 1111.

[0088] Direct contact between the heating coating 114 and the first surface 1111 means that the heating coating 114 and the first surface 1111 are not indirectly connected through other structural components (such as an insulating film). It is directly formed on the first surface 1111 by coating, printing or other methods.

[0089] For example, the heating coating 114 may cover a portion of the first surface 1111, or the heating coating 114 may cover the entire first surface 1111.

[0090] The heating coating 114 is configured to be energized to heat the battery cell 21, meaning that the heating coating 114 generates heat when energized to heat the battery cell 21.

[0091] In this embodiment, by providing a heating coating 114 on the first surface 1111, the battery cell 21 is heated to manage its temperature, thereby reducing the risk of the battery cell 21 becoming too cold and improving the reliability of the battery device 100. Simultaneously, since the heating coating 114 is applied to the first surface 1111 and is in direct contact with it, compared to the case where an electric heating film is provided between the first surface 1111 and the battery cell assembly 20, on the one hand, the gap between the heating structure and the first surface 1111 is reduced, which allows more space within the housing 10 to accommodate the battery cell 21, thus improving the volumetric energy density of the battery device 100; on the other hand, the connection strength between the heating coating 114 and the first surface 1111 is increased, thereby reducing the risk of the heating coating 114 detaching from the surface of the battery cell 21 due to high temperature curling or the first surface 1111 causing the heating coating 114 to burn out, thus improving the reliability of the battery device 100.

[0092] Please refer to Figure 2 and Figure 5 , Figure 5 This is a cross-sectional view of a battery device 100 provided for some embodiments of this application. According to some embodiments of this application, at least a portion of the heating coating 114 is in direct contact with the battery cell 21.

[0093] Direct contact between at least part of the heating coating 114 and the battery cell 21 means that the heating coating 114 and the battery cell 21 are not indirectly connected through other structural components (such as an insulating film), but rather at least part of the surface of the heating coating 114 away from the first surface 1111 is in contact with the battery cell 21.

[0094] In some embodiments, an insulating member 214 is provided on the outer surface of the housing 212 of the battery cell 21. The insulating member 214 at least covers the portion of the outer surface of the housing 212 that is in direct contact with the heating coating 114, thereby reducing the risk of short circuits between battery cells 21 through the heating coating 114.

[0095] For example, the insulating element 214 may cover part or all of the outer surface of the housing 212. In embodiments where the insulating element 214 does not completely cover the surface of the housing 212, an adhesive for connecting the housing 212 to the adjacent battery cell 21 may be directly applied to the portion of the housing 212 not covered by the insulating element 214, or an adhesive for connecting the housing 212 to the first surface 1111 may be directly applied to the portion of the housing 212 not covered by the insulating element 214.

[0096] In this embodiment, at least part of the heating coating 114 is in direct contact with the battery cell 21. On the one hand, this facilitates the transfer of heat generated by the heating coating 114 when energized to the battery cell 21, thereby enabling the heating coating 114 to manage the temperature of the battery cell 21 and reducing the risk of the battery cell 21 becoming too cold. On the other hand, the direct contact between the heating coating 114 and the battery cell 21, compared to the case where an insulating film is sandwiched between the heating structure in the electric heating film and the battery cell 21, reduces the risk of the insulating film curling up at high temperatures and detaching from the surface of the battery cell 21, causing the heating coating 114 to burn out, thereby further improving the reliability of the battery device 100.

[0097] According to some embodiments of this application, the heat-conducting coating 114 includes carbon-based materials, graphene composite materials, and metallic materials.

[0098] Carbon-based materials refer to functional materials whose substrates consist of superconducting carbon black and single-walled / multi-walled carbon nanotubes, and which are bonded together with organic resins such as phenolic resin, epoxy resin, polyimide, polyvinyl alcohol, and acrylic resin.

[0099] Graphene composite materials refer to composite materials composed of graphene and nano-carbon materials.

[0100] The metal material can be copper or aluminum. For example, the metal material can be doped with silicon / nitride to improve the heat uniformity of the metal material.

[0101] Understandably, before forming the heat-coated layer 114, the carbon-based material, graphene composite material, and metal material can be in a slurry form to facilitate the mixing, printing, or coating of the carbon-based material, graphene composite material, and metal material.

[0102] For example, the carbon-based material in the heating coating 114 has a mass ratio of 1%-20%, with the carbon-based material content being greater than or equal to 1% to give the heating coating 114 a certain conductivity, thereby reducing the risk of current interruption due to excessive resistance. Conversely, the carbon-based material content in the heating coating 114 is less than or equal to 20% to give the heating coating 114 a certain resistance value, allowing it to reach the predetermined temperature quickly after being energized. Therefore, a carbon-based material mass ratio of 1%-20% in the heating coating 114 ensures moderate resistance, stable and controllable heating.

[0103] In the heating coating 114, the graphene composite material accounts for 4%-6% of the total mass. A mass percentage greater than or equal to 4% ensures the heating coating 114 has sufficient thermal conductivity to reduce the risk of localized overheating. Conversely, a mass percentage less than or equal to 6% ensures the heating coating 114 has sufficient resistance, allowing it to reach the predetermined temperature quickly after being energized. Therefore, a mass percentage of 4%-6% for the graphene composite material in the heating coating 114 results in moderate resistance and stable, uniform, and controllable heating.

[0104] In this embodiment, the high electrical resistance of carbon-based materials (such as carbon fibers and carbon nanotubes) allows the heating coating 114 to reach the predetermined temperature quickly after being energized, which is beneficial for timely temperature control of the battery cell 21 and reduces the risk of the battery cell 21 becoming too cold. Graphene composite materials have extremely high electrical and thermal conductivity, which helps to improve the temperature uniformity of the heating coating 114 and reduces the risk of thermal runaway of the battery cell 21 due to localized high temperatures in the heating coating 114. Metal materials are readily available and give the heating coating 114 a certain structural strength. At the same time, since carbon-based materials, graphene composite materials, and metal materials all have good toughness, mixing and coating the carbon-based slurry, graphene composite slurry, and metal slurry onto the first surface 1111 to form the heating coating 114 helps to improve the flexibility of the heating coating 114 and reduces the risk of the heating coating 114 falling off the first surface 1111, thereby further improving the reliability of the battery device 100.

[0105] Please refer to Figure 2 According to some embodiments of this application, the first box wall 113 is a bottom plate 111, which is used to support the battery cell assembly 20.

[0106] The base plate 111 is a plate-shaped component for supporting the battery cell assembly 20. For example, the base plate 111 may be provided with structural members for restricting the movement of the battery cell assembly 20.

[0107] In this embodiment, by setting the first box wall 113 as the bottom plate 111, and by supporting the battery cell assembly 20, i.e., the first surface 1111 is located below the battery cell assembly 20, the bottom of the battery cell 21 will be heated when the heating coating 114 is energized, and the air at the bottom of the battery cell 21 will be heated and rise, so as to form convection with the air at the top of the battery cell 21 in the direction of gravity. This facilitates the uniform temperature rise inside the box 10, thereby reducing the risk of uneven temperature inside the battery device 100 and improving the reliability of the battery device 100.

[0108] Please refer to Figure 2 Please refer to Figure 6 and Figure 7 , Figure 6 This is a schematic diagram of the structure of the first box body 11 provided in some embodiments of this application. Figure 7 This is a schematic diagram of the structure of a first housing body 11 in another direction, provided for some embodiments of this application. According to some embodiments of this application, the battery cell assembly 20 includes at least one row of battery cells 21, each row of battery cells 21 including a plurality of battery cells 21 arranged along a first direction X, the first direction X being perpendicular to the surface of the battery cell 21 with the largest area; the first surface 1111 includes a first region 11110 overlapping with the battery cell assembly 20, and a heating coating 114 is disposed in the first region 11110; the first region 11110 includes a first end region 1111A, a middle region 1111B and a second end region 1111C sequentially distributed along the first direction X, the resistance of the heating coating 114 located in the middle region 1111B is less than the resistance of the heating coating 114 located in the first end region 1111A, and the resistance of the heating coating 114 located in the middle region 1111B is less than the resistance of the heating coating 114 located in the second end region 1111C.

[0109] In some embodiments, the battery cell assembly 20 includes multiple rows of battery cells 21 arranged along a second direction Y. Each row of battery cells 21 includes multiple battery cells 21 arranged along a first direction X, which is perpendicular to the surface of the battery cell 21 with the largest area. The first direction X, the second direction Y, and the thickness direction Z of the base plate are all perpendicular to each other.

[0110] The first direction X is a direction perpendicular to the thickness direction Z of the base plate 111. In some embodiments, the two ends of the battery device 100 in the first direction X are exposed to the outside.

[0111] Understandably, along the first direction X, the battery cell 21 located in the middle of the battery cell assembly 20 generates heat itself and also receives heat from the adjacent battery cells 21, making the temperature of the battery cell 21 higher than the temperature of the battery cells 21 near the end of the battery cell assembly 20 in the first direction X.

[0112] The first region 11110 is the area in the first surface 1111 that overlaps with the battery cell assembly 20 in the thickness direction Z of the base plate. For example, the first region 11110 is the portion of the first surface 1111 located in the battery cavity 10A.

[0113] The first end region 1111A, the middle region 1111B, and the second end region 1111C are three regions of equal area arranged along the first direction X in the first region 11110.

[0114] In some embodiments, please refer to Figure 7 and Figure 8 The first end region 1111A, the middle region 1111B, and the second end region 1111C are all rectangular. The length direction of the first end region 1111A, the middle region 1111B, and the second end region 1111C is parallel to the second direction Y, and the width direction of the first end region 1111A, the middle region 1111B, and the second end region 1111C is parallel to the first direction X.

[0115] Understandably, in the current flow path passing through the heating coating 114, the heating coating 114 located in the first end region 1111A, the heating coating 114 located in the middle region 1111B, and the heating coating 114 located in the second end region 1111C are arranged sequentially and connected in series.

[0116] The resistance of the heating coating 114 located in the central region 1111B is less than that of the heating coating 114 located in the first end region 1111A, and the resistance of the heating coating 114 located in the central region 1111B is less than that of the heating coating 114 located in the second end region 1111C. In other words, the resistance of the heating coating 114 located in the central region 1111B is the lowest among the heating coatings 114 located in different regions. Therefore, when energized, the heat generated by the heating coating 114 located in the central region 1111B is lower than the heat generated by the heating coating 114 located in the first end region 1111A, and the heat generated by the heating coating 114 located in the central region 1111B is lower than the heat generated by the heating coating 114 located in the second end region 1111C.

[0117] In some embodiments, in the first direction X, the orthographic projection of a portion of the battery cell 21 located in the middle of the battery cell assembly 20 onto the base plate 111 falls within the middle region 1111B, and the two edges of the middle region 1111B that are disposed opposite to each other in the first direction X both extend beyond the orthographic projection of the portion of the battery cell 21, wherein the portion of the battery cell 21 is at least one battery cell 21.

[0118] In this embodiment, by setting the resistance of the heating coating 114 located in the middle region 1111B to be less than the resistance of the heating coating 114 located in the first end region 1111A and the second end region 1111C, the heat energy generated by the heating coating 114 located in the middle region 1111B is less than the heat energy generated by the heating coating 114 located in the first end region 1111A and the second end region 1111C. As a result, the heat energy provided by the heating coating 114 to the battery cell 21 located in the middle of the battery cell assembly 20 in the first direction X is less than the heat energy provided by the heating coating 114 to the battery cells 21 located at both ends of the battery cell assembly 20 in the first direction X. This makes the temperature distribution of the battery cells 21 in the battery cell assembly 20 more uniform, reduces the risk of heat concentration in the battery cells 21 located in the middle of the battery cell assembly 20 in the first direction X, and improves the reliability of the battery device 100.

[0119] Please refer to Figure 7 and Figure 8 According to some embodiments of this application, the heat-conducting coating 114 includes at least one meandering texture 1140.

[0120] The meandering extension refers to the heating coating 114 being arranged in a serpentine, meandering manner on the first surface 1111 with high density.

[0121] In some embodiments, please refer to Figure 7 The texture 1140 includes a first segment 1141, a second segment 1142, and a third segment 1143. Multiple first segments 1141 are spaced apart along a first direction X. The first segment 1141 extends along a second direction Y and has a first end 1141A and a second end 1141B positioned opposite each other in the second direction Y. The second segment 1142 connects the first ends 1141A of two adjacent first segments 1141, and the third segment 1143 connects the second ends 1141B of two adjacent first segments 1141. Along the first direction X, the second segment 1142 and the third segment 1143 are alternately arranged. The first direction X, the second direction Y, and the thickness direction Z of the base plate are all perpendicular to each other.

[0122] In some embodiments, please refer to Figure 8The texture 1140 includes a first segment 1141, a second segment 1142, and a third segment 1143. Multiple first segments 1141 are spaced apart along the second direction Y. The first segment 1141 extends along the first direction X and has a first end 1141A and a second end 1141B positioned opposite each other in the first direction X. The second segment 1142 connects the first ends 1141A of two adjacent first segments 1141, and the third segment 1143 connects the second ends 1141B of two adjacent first segments 1141. Along the second direction Y, the second segment 1142 and the third segment 1143 are alternately arranged. The first direction X, the second direction Y, and the thickness direction Z of the base plate are all perpendicular to each other.

[0123] In this embodiment, by setting the heating coating 114 as at least one meandering extended texture 1140, compared to setting the heating coating 114 as a plate-like structure covering part of the first surface 1111, on the one hand, the length of the current path is increased while the current flow area is reduced, which helps to increase the resistance of the heating coating 114, thereby improving the heating efficiency of the heating coating 114. This is beneficial for the heating coating 114 to manage the temperature of the battery cell 21, thereby reducing the risk of the battery cell 21 being too cold. On the other hand, it reduces the risk of uneven current distribution, thereby reducing the risk of severe uneven heating caused by the heating coating 114 having too much current in some areas and too little current in most areas, thereby improving the reliability of the battery device 100.

[0124] Please refer to Figure 7 and Figure 8 According to some embodiments of this application, the ratio of the area of ​​the texture 1140 located in the middle region 1111B to the area of ​​the middle region 1111B is less than the ratio of the area of ​​the texture 1140 located in the first end region 1111A to the area of ​​the first end region 1111A; the ratio of the area of ​​the texture 1140 located in the middle region 1111B to the area of ​​the middle region 1111B is less than the ratio of the area of ​​the texture 1140 located in the second end region 1111C to the area of ​​the second end region 1111C.

[0125] In some embodiments, please refer to Figure 7 The first segment 1141 consists of multiple segments spaced apart along the first direction X. The first segment 1141 extends along the second direction Y. The distance between two adjacent first segments 1141 located in the middle region 1111B in the first direction X is greater than the distance between two adjacent first segments 1141 located in the first end region 1111A in the first direction X. The distance between two adjacent first segments 1141 located in the middle region 1111B in the first direction X is greater than the distance between two adjacent first segments 1141 located in the second end region 1111C in the first direction X.

[0126] In some embodiments, please refer to Figure 7 The first end region 1111A includes a plurality of first sub-regions 11111 arranged along the first direction X. The distance between two adjacent first segments 1141 on the first sub-region 11111 near the middle region 1111B in the first direction X is a first distance. The distance between two adjacent first segments 1141 on the first sub-region 11111 far from the middle region 1111B in the first direction X is a second distance. The first distance is greater than the second distance. The second end region 1111C includes a plurality of second sub-regions 11112 arranged along the first direction X. The distance between two adjacent first segments 1141 in the second sub-region 11112 located near the middle region 1111B in the first direction X is the third distance. The distance between two adjacent first segments 1141 in the second sub-region 11112 located away from the middle region 1111B in the first direction X is the fourth distance. The third distance is greater than the fourth distance.

[0127] In some embodiments, please refer to Figure 8 The heating coating 114 includes multiple meandering lines 1140, which are spaced apart along the second direction Y. Lines 1140 are correspondingly provided on the first end region 1111A, the middle region 1111B, and the second end region 1111C. Each line 1140 includes a first segment 1141, a second segment 1142, and a third segment 1143. Multiple first segments 1141 are spaced apart along the second direction Y. The first segments 1141 extend along the first direction X. X has a first end 1141A and a second end 1141B that are arranged opposite to each other. The distance between two adjacent first segments 1141 on the middle region 1111B in the second direction Y is greater than the distance between two adjacent first segments 1141 on the first end region 1111A in the second direction Y. The distance between two adjacent first segments 1141 on the middle region 1111B in the second direction Y is greater than the distance between two adjacent first segments 1141 on the second end region 1111C in the second direction Y.

[0128] In this embodiment, the ratio of the area of ​​the texture 1140 located in the middle region 1111B to the area of ​​the middle region 1111B is less than the ratio of the area of ​​the texture 1140 located in the first end region 1111A and the second end region 1111C to the area of ​​the first end region 1111A and the second end region 1111C. Thus, under the premise that the width and thickness of the texture 1140 remain unchanged, the length of the texture 1140 located in the middle region 1111B is less than the length of the texture 1140 located in the first end region 1111A and the second end region 1111C. Consequently, the resistance of the texture 1140 located in the middle region 1111B is less than the resistance of the texture 1140 located in the first end region 1111A and the second end region 1111C. This results in the heating coating 114 providing less heat to the battery cells 21 located in the middle of the battery cell assembly 20 in the first direction X than it provides to the battery cells 21 located at both ends of the battery cell assembly 20 in the first direction X. This makes the temperature distribution of the battery cells 21 in the battery cell assembly 20 more uniform, reduces the risk of heat concentration in the battery cells 21 located in the middle of the battery cell assembly 20 in the first direction X, and improves the reliability of the battery device 100.

[0129] Please refer to Figure 9 , Figure 9 This is a cross-sectional view of another first box body 11 provided for some embodiments of this application. According to some embodiments of this application, the width of the texture 1140 located in the central region 1111B is greater than the width of the texture 1140 located in the first end region 1111A; the width of the texture 1140 located in the central region 1111B is greater than the width of the texture 1140 located in the second end region 1111C.

[0130] The width of the fingerprint 1140 is the dimension of the fingerprint 1140 in a direction that is perpendicular to both the extension direction of the fingerprint 1140 and the thickness direction Z of the base plate.

[0131] For example, a portion of the texture 1140 extends along the first direction X, and the width of the texture 1140 refers to the size of that portion of the texture 1140 in the second direction Y; or, a portion of the texture 1140 extends along the second direction Y, and the width of the texture 1140 refers to the size of that portion of the texture 1140 in the first direction X.

[0132] In some embodiments, please refer to Figure 9The first end region 1111A includes a plurality of first sub-regions 11111 arranged along the first direction X. The width of the texture 1140 on the first sub-region 11111 located near the middle region 1111B in two adjacent first sub-regions 11111 is greater than the width of the texture 1140 on the first sub-region 11111 located away from the middle region 1111B in two adjacent first sub-regions 11111. The second end region 1111C includes a plurality of second sub-regions 11112 arranged along the first direction X. The width of the texture 1140 on the second sub-region 11112 located near the middle region 1111B in two adjacent second sub-regions 11112 is greater than the width of the texture 1140 on the second sub-region 11112 located away from the middle region 1111B in two adjacent second sub-regions 11112.

[0133] In this embodiment, the width of the texture 1140 located in the middle region 1111B is greater than the width of the texture 1140 located in the first end region 1111A and the second end region 1111C. Thus, under the premise that the thickness of the texture 1140 remains unchanged and the length of the texture 1140 in each region is the same, the cross-sectional area of ​​the texture 1140 located in the middle region 1111B is greater than the cross-sectional area of ​​the texture 1140 located in the first end region 1111A and the second end region 1111C. Consequently, the resistance of the texture 1140 located in the middle region 1111B is less than the resistance of the texture 1140 located in the first end region 1111A and the second end region 1111C. This results in the heating coating 114 providing less heat to the battery cells 21 located in the middle of the battery cell assembly 20 in the first direction X than it provides to the battery cells 21 located at both ends of the battery cell assembly 20 in the first direction X. This makes the temperature distribution of the battery cells 21 in the battery cell assembly 20 more uniform, reduces the risk of heat concentration in the battery cells 21 located in the middle of the battery cell assembly 20 in the first direction X, and improves the reliability of the battery device 100.

[0134] Please refer to Figure 10 According to some embodiments of this application, the thickness of the texture 1140 located in the middle region 1111B is greater than the thickness of the texture 1140 located in the first end region 1111A; the thickness of the texture 1140 located in the middle region 1111B is greater than the thickness of the texture 1140 located in the second end region 1111C.

[0135] The width of the fingerprint pattern 1140 is the dimension of the fingerprint pattern 1140 in the thickness direction Z of the base plate.

[0136] In some embodiments, please refer to Figure 9The first end region 1111A includes a plurality of first sub-regions 11111 arranged along the first direction X. The thickness of the texture 1140 on the first sub-region 11111 located near the middle region 1111B in two adjacent first sub-regions 11111 is greater than the thickness of the texture 1140 on the first sub-region 11111 located away from the middle region 1111B in two adjacent first sub-regions 11111. The second end region 1111C includes a plurality of second sub-regions 11112 arranged along the first direction X. The thickness of the texture 1140 on the second sub-region 11112 located near the middle region 1111B in two adjacent second sub-regions 11112 is greater than the thickness of the texture 1140 on the second sub-region 11112 located away from the middle region 1111B in two adjacent second sub-regions 11112.

[0137] In this embodiment, the thickness of the texture 1140 located in the middle region 1111B is greater than the thickness of the texture 1140 located in the first end region 1111A and the second end region 1111C. Thus, under the premise that the width of the texture 1140 remains unchanged and the length of the texture 1140 in each region is the same, the cross-sectional area of ​​the texture 1140 located in the middle region 1111B is greater than the cross-sectional area of ​​the texture 1140 located in the first end region 1111A and the second end region 1111C. Consequently, the resistance of the texture 1140 located in the middle region 1111B is less than the resistance of the texture 1140 located in the first end region 1111A and the second end region 1111C. This results in the heating coating 114 providing less heat to the battery cells 21 located in the middle of the battery cell assembly 20 in the first direction X than it provides to the battery cells 21 located at both ends of the battery cell assembly 20 in the first direction X. This makes the temperature distribution of the battery cells 21 in the battery cell assembly 20 more uniform, reduces the risk of heat concentration in the battery cells 21 located in the middle of the battery cell assembly 20 in the first direction X, and improves the reliability of the battery device 100.

[0138] Please refer to Figure 5 and Figure 10 , Figure 10 This is a cross-sectional view of another battery device 100 provided for some embodiments of this application. According to some embodiments of this application, the side of the battery cell 21 facing the base plate 111 includes a contact area 21A that is in direct contact with the heating coating 114 and a non-contact area 21B that is not in contact with the heating coating 114; the battery device 100 also includes an adhesive layer 116, through which the non-contact area 21B is bonded to the base plate 111.

[0139] The contact area 21A is the area on the side of the battery cell 21 facing the first surface 1111 that is in direct contact with the heating coating 114; the non-contact area 21B is the area on the side of the battery cell 21 facing the first surface 1111 that is not in direct contact with the heating coating 114.

[0140] For example, the projection of the contact area 21A on the first surface 1111 overlaps with the heating coating 114, while the projection of the non-contact area 21B on the first surface 1111 does not overlap with the heating coating 114.

[0141] The adhesive layer 116 is a bonding structure for adhering the battery cell 21 to the first surface 1111. The adhesive layer 116 can be a thermally conductive adhesive layer 30. Exemplarily, the adhesive layer 116 may include a base resin and a thermally conductive filler, wherein the base resin may be one or more of epoxy resin, silicone resin, and polyurethane resin. The thermally conductive filler may be one or more of alumina, aluminum nitride, and zinc oxide.

[0142] In some embodiments, please refer to Figure 5 The heating coating 114 has a meandering texture 1140 with a constant thickness. The side of the adhesive layer 116 facing the battery cell 21 is flush with the side of the texture 1140 facing the battery cell 21. This provides a more stable mounting reference for the battery cell 21.

[0143] In some embodiments, please refer to Figure 10 The heating coating 114 has a meandering texture 1140. The thickness of the texture 1140 in the central region 1111B is greater than the thickness of the texture 1140 in the first end region 1111A; the thickness of the texture 1140 in the central region 1111B is greater than the thickness of the texture 1140 in the second end region 1111C. The side of the adhesive layer 116 facing the battery cell 21 is flush with the side of the texture 1140 in the central region 1111B facing the battery cell 21. The adhesive layer 116 covers the texture 1140 in the first end region 1111A, so that the battery cell 21 can be connected to the heating coating 114 through the adhesive layer 116 to connect with the first end region 1111A. The adhesive layer 116 covers the texture 1140 in the second end region 1111C, so that the battery cell 21 can be connected to the heating coating 114 through the adhesive layer 116 to connect with the second end region 1111C. This improves the connection strength between the battery cell 21 and the first surface 1111, thereby improving the reliability of the battery device 100.

[0144] In this embodiment, the contact area 21A of the battery cell 21 is in direct contact with the heating coating 114, so that the thickness of the adhesive layer 116 can be adjusted through the thickness of the heating coating 114, which is beneficial to adjusting the connection strength between the battery cell 21 and the box 10, and is beneficial to controlling the distance between the battery cell 21 and the first surface 1111, so that more space in the box 10 can be used for accommodating the battery cell 21, which is beneficial to improving the volumetric energy density of the battery device 100, and further improves the volumetric energy density of the battery device 100 while enhancing the reliability of the battery device 100.

[0145] Please refer to Figure 6 , according to some embodiments of the present application, the bottom plate 111 is provided with an electrical connector 117, and the heating coating 114 is electrically connected to the electrical connector 117.

[0146] The electrical connector 117 may be a structural member in the battery device 100 for electrically connecting the heating coating 114 to a power source. It can be understood that the electrical connector 117 is provided with a positive wiring terminal connected to the positive electrode of the heating coating 114 and a negative wiring terminal connected to the negative electrode of the heating coating 114.

[0147] For example, the electrical connector 117 may include, but is not limited to, a high-low voltage connector.

[0148] In some embodiments, the electrical connector 117 is located in the electrical compartment.

[0149] In this embodiment, by providing the electrical connector 117, it is convenient to supply electric energy to the heating coating 114, and the structure is simple and easy to implement.

[0150] According to some embodiments of the present application, the battery cell 21 is electrically connected to the heating coating 114, and the battery cell 21 is configured to supply electric energy to the heating coating 114.

[0151] In some embodiments, a voltage regulating device is disposed in the electrical cavity 10B, the battery cell 21 is electrically connected to the electrical connector 117 through the voltage regulating device, and the voltage regulating device is configured to regulate the voltage output by the battery cell 21 to adjust the magnitude of the current passing through the heating coating 114, so as to adjust the magnitude of the thermal energy generated by the heating coating 114.

[0152] In this embodiment, the battery cell 21 supplies electric energy to the heating coating 114, so that compared with the case of an external power source, an external high-voltage interface, an external power line, a connector and related safety isolation devices are omitted. The structures matching the heating coating 114 are completely arranged inside the box 10, which improves the structural compactness of the battery device 100, is beneficial to the overall packaging and sealing design of the battery device 100, and thus improves the reliability of the battery device 100.

[0153] According to some embodiments of this application, this application also provides an electrical device, which includes a battery device 100 of any of the above schemes, and the battery device 100 is used to provide electrical energy to the electrical device.

[0154] According to some embodiments of this application, this application also provides a method for manufacturing a battery device 100, including forming a heating coating 114 on the first surface 1111 of the first wall 113 of the housing 10 by a printing process; and installing a battery cell 21 into the housing 10 so that at least part of the heating coating 114 is in direct contact with the battery cell 21.

[0155] Printing refers to coating a paste onto the first surface 1111 in a specific manner to form a specific pattern (i.e., the shape of the heating coating 114). This creates a continuous cover layer on the first surface 1111 after the paste dries and solidifies, capable of conducting electricity to generate heat and thus raising the temperature of the battery cell 21. This cover layer is bonded to the first surface 1111 through some form of interface, becoming part of the first casing wall 113. This enhances the structural strength of the heating structure, eliminating the need for additional structures (such as a PI film) to reduce the risk of damage during transportation.

[0156] In this embodiment, a heating coating 114 is formed on the first surface 1111 by a printing process. Compared with the case where an electric heating film is placed between the first surface 1111 and the battery cell assembly 20, on the one hand, the gap between the heating structure and the first surface 1111 is reduced, which is conducive to using more space in the housing 10 to accommodate the battery cell 21, thereby improving the volumetric energy density of the battery device 100. On the other hand, the connection strength between the heating structure and the first surface 1111 is improved, thereby reducing the risk of the heating coating 114 detaching from the surface of the battery cell 21 due to high temperature or the heating coating 114 dry burning due to the first surface 1111, thereby improving the reliability of the battery device 100.

[0157] According to some embodiments of this application, the first box wall 113 is a bottom plate 111; after forming the heating coating 114 and before loading the battery cell 21 into the box 10, the manufacturing method further includes: coating the first surface 1111 with an adhesive layer 116.

[0158] In this embodiment, by coating the first surface 1111 with an adhesive layer 116, and then connecting the battery cell 21 and the first surface 1111 through the adhesive layer 116, since the heating coating 114 is printed on the first surface 1111, and an electric heating film is provided between the first surface 1111 and the battery cell assembly 20, the battery cell 21 can be connected to the heating coating 114 through the adhesive layer 116, thereby indirectly connecting to the first surface 1111, thereby improving the connection strength between the battery cell 21 and the first surface 1111, and thus improving the reliability of the battery device 100.

[0159] According to some embodiments of this application, a heat-generating coating 114 is formed on the first surface 1111 of the first wall 113 of the housing 10 by a printing process, including forming the heat-generating coating 114 on the first surface 1111 of the first wall 113 of the housing 10 by a screen printing process.

[0160] Screen printing, also known as silk screen printing, is a printing method in which ink is forced through the mesh of a printing plate onto a first surface 1111 by the pressure of a squeegee.

[0161] Understandably, the ratio of the area of ​​the heating wire to the area of ​​different regions can be adjusted by adjusting the density of the mesh; or the width of the texture 1140 can be adjusted by adjusting the size of the mesh; or the thickness of the texture 1140 can be adjusted by setting the thickness of the printing plate at the mesh.

[0162] In this embodiment, a heating coating 114 is formed on the first surface 1111 of the first wall 113 of the housing 10 by a screen printing process. This allows for adjustment of the width, thickness, and length of the heating coating 114 in different areas by adjusting the structure of the screen. This helps to adjust the resistance of the heating coating 114 in different areas, thereby improving the reliability of the battery device 100.

[0163] According to some embodiments of this application, refer to Figures 2 to 10This application provides a battery device 100 including a battery cell assembly 20 and a housing 10. The battery cell assembly 20 includes a plurality of battery cells 21; the housing 10 houses the battery cell assembly 20 and includes a first housing wall 113 having a first surface 1111 facing the battery cell assembly 20; wherein, a heating coating 114 is disposed on the first surface 1111, the heating coating 114 being in direct contact with the first surface 1111, and the heating coating 114 being configured to be electrically conductive to heat the battery cells 21. The heating coating 114 includes carbon-based materials, graphene composite materials, and metallic materials. The first housing wall 113 is a base plate 111, which supports the battery cell assembly 20. The battery cell assembly 20 includes at least one row of battery cells 21, each row of battery cells 21 including a plurality of battery cells 21 arranged along a first direction X, the first direction X being perpendicular to the surface of the battery cell 21 with the largest area; the first surface 1111 includes a first region 11110 overlapping with the battery cell assembly 20, and a heating coating 114 is disposed in the first region 11110; the first region 11110 includes a first end region 1111A, a middle region 1111B, and a second end region 1111C sequentially distributed along the first direction X, the resistance of the heating coating 114 located in the middle region 1111B being less than the resistance of the heating coating 114 located in the first end region 1111A, and the resistance of the heating coating 114 located in the middle region 1111B being less than the resistance of the heating coating 114 located in the second end region 1111C. The heating coating 114 includes at least one meandering extended texture 1140. The ratio of the area of ​​texture 1140 in the central region 1111B to the area of ​​the central region 1111B is less than the ratio of the area of ​​texture 1140 in the first end region 1111A to the area of ​​the first end region 1111A; the ratio of the area of ​​texture 1140 in the central region 1111B to the area of ​​the central region 1111B is less than the ratio of the area of ​​texture 1140 in the second end region 1111C to the area of ​​the second end region 1111C. The width of texture 1140 in the central region 1111B is greater than the width of texture 1140 in the first end region 1111A; the width of texture 1140 in the central region 1111B is greater than the width of texture 1140 in the second end region 1111C. The thickness of the texture 1140 located in the central region 1111B is greater than the thickness of the texture 1140 located in the first end region 1111A; the thickness of the texture 1140 located in the central region 1111B is greater than the thickness of the texture 1140 located in the second end region 1111C. The side of the battery cell 21 facing the base plate 111 includes a contact area 21A that is in direct contact with the heating coating 114 and a non-contact area 21B that is not in contact with the heating coating 114; the battery device 100 also includes an adhesive layer 116, through which the non-contact area 21B is bonded to the base plate 111.The base plate 111 is provided with an electrical connector 117, and the heating coating 114 is electrically connected to the electrical connector 117. The battery cell 21 is electrically connected to the heating coating 114, and the battery cell 21 is used to provide electrical energy to the heating coating 114.

[0164] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0165] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit this application. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery device, characterized in that, include: A battery cell assembly, comprising multiple battery cells; A housing for housing the battery cell assembly, the housing including a first housing wall having a first surface facing the battery cell assembly; Wherein, a heating coating is provided on the first surface, the heating coating is in direct contact with the first surface, the heating coating is formed on the first surface by printing or coating, and is configured to be energized to heat the battery cell; The first box wall is a bottom plate, which is used to support the battery cell assembly; The side of the battery cell facing the base plate includes a contact area that is in direct contact with the heating coating and a non-contact area that is not in contact with the heating coating; The battery device also includes an adhesive layer, through which the non-contact area is bonded to the base plate.

2. The battery device as claimed in claim 1, characterized in that, The heating coating includes carbon-based materials, graphene composite materials, and metallic materials.

3. The battery device as claimed in claim 1, characterized in that, The battery cell assembly includes at least one column of battery cells, and each column of battery cells includes a plurality of battery cells arranged along a first direction, the first direction being perpendicular to the surface of the battery cell with the largest area. The first surface includes a first region that overlaps with the battery cell assembly, and the heating coating is disposed in the first region; The first region includes a first end region, a middle region, and a second end region distributed sequentially along the first direction. The resistance of the heating coating located in the middle region is less than the resistance of the heating coating located in the first end region, and the resistance of the heating coating located in the middle region is less than the resistance of the heating coating located in the second end region.

4. The battery device as claimed in claim 3, characterized in that, The heated coating includes at least one meandering, extending texture.

5. The battery device as claimed in claim 4, characterized in that, The ratio of the area of ​​the texture located in the middle region to the area of ​​the middle region is less than the ratio of the area of ​​the texture located in the first end region to the area of ​​the first end region; the ratio of the area of ​​the texture located in the middle region to the area of ​​the middle region is less than the ratio of the area of ​​the texture located in the second end region to the area of ​​the second end region.

6. The battery device as claimed in claim 4, characterized in that, The width of the texture located in the middle region is greater than the width of the texture located in the first end region; the width of the texture located in the middle region is greater than the width of the texture located in the second end region.

7. The battery device as claimed in claim 4, characterized in that, The thickness of the texture located in the middle region is greater than the thickness of the texture located in the first end region; the thickness of the texture located in the middle region is greater than the thickness of the texture located in the second end region.

8. The battery device as claimed in claim 1, characterized in that, The base plate is provided with an electrical connector, and the heating coating is electrically connected to the electrical connector.

9. The battery device as claimed in claim 1, characterized in that, The battery cell is electrically connected to the heating coating, and the battery cell is used to provide electrical energy to the heating coating.

10. An electrical appliance, characterized in that, The electrical device includes a battery device as described in any one of claims 1-9, the battery device being used to provide electrical energy.

11. A method for manufacturing a battery device, applicable to the battery device according to any one of claims 1-9, characterized in that, The manufacturing method includes: A heat-generating coating is formed on the first surface of the first wall of the box body using a printing process; The battery cells are installed into the housing, so that at least a portion of the heating coating is in direct contact with the battery cells.

12. The method for manufacturing the battery device as claimed in claim 11, characterized in that, The first box wall is the bottom plate; After the heating coating is formed and before the battery cells are installed into the housing, the manufacturing method further includes: An adhesive layer is applied to the first surface.

13. The method for manufacturing the battery device as claimed in claim 11, characterized in that, The process of forming a heat-resistant coating on the first surface of the first wall of the housing through a printing process includes: A heat-generating coating is formed on the first surface of the first wall of the enclosure using a screen printing process.

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