Battery device and electric device

Abstract

The embodiment of the utility model provides a battery device and a power utilization device, and relates to the technical field of batteries. The battery device comprises a box body, a battery monomer assembly and a heating film, an accommodating space is formed in the box body, and the box body comprises a first wall. The battery cell assembly is accommodated in the accommodation space, and the battery cell assembly includes a plurality of battery cells. In the thickness direction of the first wall, at least part of the heating film is arranged between the first wall and the battery monomer assembly, and the heating film is in heat conduction connection with the battery monomers. The surface, facing the first wall, of at least one battery cell is provided with a connecting area which is not covered by the heating film, and the connecting area is connected with the first wall. According to the battery device provided by the embodiment of the invention, the connecting area, which is not covered by the heating film, of the single battery is connected to the first wall, so that the fixing strength of the single battery can be improved, the single battery can be better fixed in the box body, the situation that the single battery is damaged due to the fact that the single battery moves relative to the box body is reduced, and the service life of the battery device is prolonged. And the reliability of the battery device is improved.

Description

Technical Field

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

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

[0003] In the development of battery technology, the reliability of battery devices is a crucial issue. Poor reliability hinders the widespread adoption of such devices. Therefore, improving the reliability of battery devices is a long-term technical challenge that requires continuous consideration. Utility Model Content

[0004] This application provides a battery device and an electrical device that can improve the reliability of the battery device.

[0005] This application is achieved through the following technical solution:

[0006] In a first aspect, embodiments of this application provide a battery device, including a housing, a battery cell assembly, and a heating film. The housing has a receiving space and includes a first wall. The battery cell assembly is received in the receiving space and includes a plurality of battery cells. Along the thickness direction of the first wall, at least a portion of the heating film is disposed between the first wall and the battery cell assembly, and the heating film is thermally connected to the battery cells. At least one battery cell has a connection area on its surface facing the first wall that is not covered by the heating film, and the connection area is connected to the first wall.

[0007] In the above embodiments, the heating film is disposed between the battery cell assembly and the first wall. The heating film is thermally connected to the battery cell so that the heating film can heat the battery cell. By connecting the connection area of ​​the battery cell not covered by the heating film to the first wall, the fixing strength of the battery cell can be improved, so that the battery cell can be better fixed in the housing, thereby reducing the possibility of damage to the battery cell due to movement of the battery cell relative to the housing, and thus improving the reliability of the battery device.

[0008] In some embodiments, the heating film has a perforated portion, and the connecting area is connected to the first wall at the perforated portion location.

[0009] In the above embodiments, the heating film has a hollowed-out portion, and the connection area of ​​the battery cell is connected to the first wall at the hollowed-out portion position to improve the fixing strength of the battery cell, thereby improving the overall reliability of the battery device.

[0010] In some embodiments, the heating film includes a plurality of heating portions, which are thermally connected to the battery cells. The heating portions extend along a first direction, and the plurality of heating portions are spaced apart along a second direction. A cutout is formed between two adjacent heating portions. The surfaces of the plurality of battery cells in the battery cell assembly facing the first wall form a connection area corresponding to the area of ​​the cutout. The thickness direction of the first wall, the first direction, and the second direction are perpendicular to each other.

[0011] In the above embodiments, the heating film includes multiple heating parts that are thermally connected to the battery cells, and a hollow part is formed between two adjacent heating parts. The connection area of ​​the battery cell is connected to the first wall at the hollow part to improve the fixing strength of the battery cell and thus improve the overall reliability of the battery device.

[0012] In some embodiments, the heating film further includes at least one connecting portion, wherein two adjacent heating portions are connected by a connecting portion to make the two adjacent heating portions electrically connected.

[0013] In the above embodiments, multiple heating elements are connected by a connecting part so that the multiple heating elements can form a whole, resulting in better stability of the heating film. At the same time, the multiple heating elements can also form a circuit loop through the connecting part, making the circuit layout more convenient.

[0014] In some embodiments, the heating portion and the connecting portion are alternately arranged along the extension direction of the heating film.

[0015] In the above embodiments, the heating part and the connecting part are arranged alternately, which facilitates the overall wiring of the circuit inside the heating film, reduces the setting of conductive wire bundles, thereby reducing the difficulty of arranging the internal circuit of the heating film and improving the economy of the battery device.

[0016] In some embodiments, the heating part includes a first membrane body and a first heating conductor located within the first membrane body, and the connecting part includes a second membrane body and a second heating conductor located within the second membrane body. The first membrane body and the second membrane body are integrally formed, and the first heating conductor and the second heating conductor are integrally formed.

[0017] In the above embodiments, by integrally forming multiple heating parts with at least one connecting part, the connecting part and the heating part have the same structure, which can improve the overall reliability of the heating film. Furthermore, the heating film can be manufactured as a whole, without the need to manufacture multiple independent heating parts, which can also reduce the difficulty of manufacturing the heating film and improve its economy.

[0018] In some embodiments, the heating section includes a first membrane body and a first heating conductor located within the first membrane body, and the connecting section is a conductive element that connects the first heating conductors of two adjacent heating sections.

[0019] In the above embodiments, the connecting part is only a conductive component, mainly performing the function of electrical connection, and does not include a heating film. This arrangement allows multiple heating parts to form a single unit, giving the heating film better integrity, reducing manufacturing costs, and improving overall economic efficiency.

[0020] In some embodiments, the housing is provided with a first beam and a second beam disposed opposite to each other along a first direction, and a plurality of battery cells in the battery cell assembly are disposed between the first beam and the second beam along the first direction; at least one connecting portion includes a first connecting portion, which is located at one end of the heating portion along the first direction near the first beam; along the thickness direction of the first wall, the first connecting portion is at least partially located between the first beam and the first wall.

[0021] In the above embodiment, the first connecting part is located between the first beam and the first wall, which can make the area of ​​the connection area of ​​the battery cell not covered by the heating film larger, thereby making the connection area between the battery cell and the first wall larger, so as to improve the fixing strength of the battery cell and further improve the reliability of the battery device.

[0022] In some embodiments, along the thickness direction of the first wall, the first beam abuts against the inner surface of the first wall, and a first clearance notch is provided on the side of the first beam facing the first wall, with at least a portion of the first connection located in the first clearance notch.

[0023] In the above implementation, the first beam abuts against the inner surface of the first wall, which gives the housing better integrity and higher reliability. Furthermore, a first clearance notch is provided on the side of the first beam facing the first wall, so that at least a portion of the first connection part is located within the first clearance notch. This allows for a larger area of ​​the connection zone of the battery cell not covered by the heating film, thereby increasing the connection area between the battery cell and the first wall, improving the fixing strength of the battery cell, and further enhancing the reliability of the battery device.

[0024] In some embodiments, a first filler is provided within the first clearance notch, and the first filler is configured to press the first connection portion against the first wall.

[0025] In the above embodiments, by providing a first filler and pressing the first connecting part against the first wall with the first filler, the first connecting part and the first wall can be relatively fixed, thereby reducing the possibility of the first connecting part and the first wall sliding relative to each other.

[0026] In some embodiments, at least one connection includes a second connection, which is located at one end of the heating part near the second beam along the first direction and at least partially located between the second beam and the first wall along the thickness direction of the first wall.

[0027] In the above embodiment, the second connecting part is located between the second beam and the first wall, which allows for a larger area of ​​the connection area of ​​the battery cell not covered by the heating film, thereby increasing the connection area between the battery cell and the first wall, improving the fixing strength of the battery cell, and further improving the reliability of the battery device.

[0028] In some embodiments, along the thickness direction of the first wall, the second beam abuts against the inner surface of the first wall, and a second clearance notch is provided on the side of the second beam facing the first wall, with at least a portion of the second connection located in the second clearance notch.

[0029] In the above implementation, the second beam abuts against the inner surface of the first wall, which gives the housing better integrity and higher reliability. Furthermore, a second clearance notch is provided on the side of the second beam facing the first wall, so that at least a portion of the second connection is located within the second clearance notch. This allows for a larger area of ​​the connection zone of the battery cell not covered by the heating film, thereby increasing the connection area between the battery cell and the first wall, improving the fixing strength of the battery cell, and further enhancing the reliability of the battery device.

[0030] In some embodiments, a second filler is provided within the second clearance notch, and the second filler is configured to press the second connection portion against the first wall.

[0031] In the above embodiments, by providing a second filler and pressing the second connecting part against the first wall with the second filler, the second connecting part can be relatively fixed to the first wall, reducing the possibility of the second connecting part sliding relative to the first wall.

[0032] In some embodiments, the heating film has two lead-out terminals, which are respectively connected to two heating parts; the second beam is provided with a channel through which at least one lead-out terminal passes.

[0033] In the above embodiment, by providing a channel on the second beam, the lead-out terminals of the heating film can be passed through the channel to support the connection of the heating film to the power supply assembly, thereby realizing the electrical connection of the heating film.

[0034] In some embodiments, a protective element is provided within the channel, which is configured to separate the lead-out terminals from the channel wall.

[0035] In the above embodiments, by providing a protective component, it is difficult for the lead-out terminals to directly contact the wall of the channel, thereby reducing the possibility of damage to the lead-out terminals due to wear between the lead-out terminals and the wall of the channel.

[0036] In some embodiments, there are multiple battery cell assemblies, and the multiple battery cells of each battery cell assembly are thermally connected to at least one heating element. The multiple battery cell assemblies are arranged along a second direction, and the multiple battery cells of the battery cell assembly are arranged along a first direction.

[0037] In the above embodiments, the extension direction of the heating element is the same as the arrangement direction of the multiple battery cells in the battery cell assembly, which enables one heating element to be thermally connected to multiple battery cells, so that the heating effect of the multiple battery cells in the battery cell assembly is more uniform and the heating effect is better.

[0038] In some embodiments, the heating film connects the battery cell and the first wall, and the connection strength between the connection area and the first wall is greater than the connection strength between the battery cell and the heating film.

[0039] In the above embodiments, the connection strength between the connection area and the first wall is greater than the connection strength between the battery cell and the heating film. This can be used to support the existing battery device with a heating film, by setting a hollow part in the heating film to improve the fixing strength of the battery cell in the battery device, thereby improving the reliability of the battery device.

[0040] In some embodiments, the heating film is bonded to the battery cell, and the connecting area is bonded to the first wall. The bonding strength between the connecting area and the first wall is greater than the bonding strength between the battery cell and the heating film. This configuration, where the bonding strength between the connecting area and the first wall is greater than the bonding strength between the battery cell and the heating film, improves the fixing strength of the battery cells in the battery device, thereby enhancing the reliability of the battery device.

[0041] In some embodiments, the housing includes a bottom wall that supports a battery cell assembly, and the first wall is the bottom wall.

[0042] In the above embodiments, placing the heating film between the bottom wall and the battery cell assembly can reduce the impact of the battery cell assembly packaging process on the heating film, thereby improving the reliability of the battery device.

[0043] Secondly, embodiments of this application provide an electrical device, including the battery device provided in any one of the embodiments of the first aspect.

[0044] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0045] 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.

[0046] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0047] Figure 2 This is an exploded view of the battery device provided in some embodiments of this application;

[0048] Figure 3 This is a schematic diagram of the connection structure between a battery cell and a busbar provided in some embodiments of this application;

[0049] Figure 4 This is an exploded structural diagram of a battery cell provided in some embodiments of this application;

[0050] Figure 5 This is a schematic diagram of the structure of a battery device provided in some embodiments of this application;

[0051] Figure 6 This is a schematic diagram of the structure of a battery device provided in some other embodiments of this application;

[0052] Figure 7 This is a schematic diagram of the structure of a battery device provided in some embodiments of this application;

[0053] Figure 8 for Figure 7 A structural schematic diagram showing the angles of the housing and heating film is provided.

[0054] Figure 9 A schematic diagram of the structure of a battery device provided in some embodiments of this application (showing the connection portion);

[0055] Figure 10 for Figure 9 A structural schematic diagram showing the angles of the housing and heating film is provided.

[0056] Figure 11 Cross-sectional views of the heating section provided in some embodiments of this application;

[0057] Figure 12 A schematic diagram of the structure of a battery device (including lead terminals) provided for some embodiments of this application;

[0058] Figure 13 for Figure 12 A structural schematic diagram showing the angles of the housing and heating film is provided.

[0059] Figure 14 for Figure 13 AA section view;

[0060] Figure 15 for Figure 13 BB cross-sectional view;

[0061] Figure 16 A schematic diagram of the structure of a battery device provided for some embodiments of this application (showing protective components).

[0062] icon:

[0063] 1000 - Vehicle; 100 - Battery unit; 200 - Controller; 300 - Motor; 10 - Housing; 11 - First housing; 12 - Second housing; 20 - Battery cell; 201 - Electrode terminal; 202 - Housing; 2021 - Shell; 2022 - End cap; 203 - Electrode assembly; 40 - Busbar; 101 - Receiving space; 102 - First wall; 103 - First beam; 1031 - First clearance notch; 10311 - First filler; 10313 - Protection Components; 104-Second beam; 1041-Second clearance notch; 1042-Channel; 10421-Protective component; 30-Battery cell assembly; 50-Heating film; 501-Hollowed-out portion; 502-Heating portion; 5021-First film body; 5022-First heating conductor; 204-Connection area; 503-Connection portion; 5031-First connection portion; 5032-Second connection portion; 504-Lead-out terminal; X-Thickness direction of the first wall; Y-First direction; Z-Second direction. Detailed Implementation

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] In this application, "multiple" means two or more (including two).

[0071] 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.

[0072] 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.

[0073] 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 battery cells, such as hexagonal prismatic battery cells.

[0074] 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.

[0075] 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 multiple battery cells and fixing them together to form an independent module.

[0076] As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0077] In some embodiments, the battery device may be a battery pack, which may include a housing and one or more individual battery cells housed within the housing.

[0078] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0079] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0080] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form an internal space for housing the individual battery cells. Here, "enclosed" refers to covering or closing; it can be sealed or not sealed. The first enclosure may be a top cover or a bottom plate.

[0081] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an internal space to house the individual battery cells.

[0082] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0083] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0084] By incorporating a heating film into the battery device and thermally connecting the heating film to the individual battery cells, the performance of the battery device in low-temperature environments can be improved. This includes enhancing the battery device's discharge capacity and charging efficiency, extending its lifespan, and improving its safety.

[0085] In battery devices with a heating film, the heating film can be placed between the battery cell and the housing to allow for thermally conductive connection between the heating film and the battery cell. When the heating film is placed between the battery cell and the housing, the side of the battery cell closest to the heating film is connected to the housing via the heating film. However, this connection method has poor reliability, as the battery cell is prone to movement relative to the housing, leading to a decrease in the overall reliability of the battery device.

[0086] Based on this, embodiments of this application provide a battery device, including a housing, a battery cell assembly, and a heating film. The housing forms a receiving space and includes a first wall. The battery cell assembly is received in the receiving space and includes multiple battery cells. Along the thickness direction of the first wall, at least a portion of the heating film is disposed between the first wall and the battery cell assembly, and the heating film is thermally connected to the battery cells. At least one battery cell has a connection area on its surface facing the first wall that is not covered by the heating film, and the connection area is connected to the first wall.

[0087] In such a battery device, a heating film is disposed between the battery cell assembly and the first wall. The heating film is thermally connected to the battery cell so that the heating film can heat the battery cell. By connecting the connection area of ​​the battery cell that is not covered by the heating film to the first wall, the fixing strength of the battery cell can be improved, so that the battery cell can be better fixed in the housing. This reduces the possibility of damage to the battery cell due to movement of the battery cell relative to the housing, thereby improving the reliability of the battery device.

[0088] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0089] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0090] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. A battery device 100 is disposed inside the vehicle 1000, and the battery device 100 may be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000.

[0091] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0092] In some embodiments of this application, the battery device 100 can not only serve as the operating 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.

[0093] Please refer to Figure 2 , Figure 2 This is an exploded structural diagram of a battery device 100 according to some embodiments of this application. The battery device 100 may include a battery cell 20 and a housing 10, the housing 10 being used to house the battery cell 20.

[0094] The housing 10 has an internal space for accommodating the battery cells 20. The housing 10 can have various structures. In some embodiments, the housing 10 may include a first housing 11 and a second housing 12, which are interlocked. The first housing 11 and the second housing 12 can have various shapes, such as cuboids or cylinders. The first housing 11 can be a hollow structure open on one side, and the second housing 12 can also be a hollow structure open on one side. The open side of the second housing 12 interlocks with the open side of the first housing 11, thus forming a housing 10 with an accommodating space. Alternatively, the first housing 11 can be a hollow structure open on one side, and the second housing 12 can be a plate-like structure, with the second housing 12 interlocked with the open side of the first housing 11, thus forming a housing 10 with an accommodating space 101.

[0095] In the battery device 100, there can be one or more battery cells 20. If there are multiple battery cells 20, they can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel. Alternatively, multiple battery cells 20 can be first connected in series, parallel, or in a mixed configuration to form a battery module, and then multiple battery modules can be connected in series, parallel, or in a mixed configuration to form a whole, which is then housed within the housing 10. Another option is that all battery cells 20 can be directly connected in series, parallel, or in a mixed configuration, and then the whole consisting of all battery cells 20 is housed within the housing 10.

[0096] In some embodiments, please refer to Figure 3 , Figure 3 This is a schematic diagram of the connection structure between the battery cell 20 and the busbar 40 in some embodiments of this application. The battery device 100 may further include the busbar 40, through which multiple battery cells 20 can be electrically connected to each other, so as to realize the series, parallel or mixed connection of multiple battery cells 20. The busbar 40 can be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0097] In some embodiments, please refer to Figure 4 , Figure 4 This is an exploded structural diagram of a battery cell 20 according to some embodiments of this application. The battery cell 20 may include a housing 202 and an electrode assembly 203, with the electrode assembly 203 housed within the housing 202.

[0098] In some embodiments, the housing 202 may include a housing 2021 and an end cap 2022, the housing 2021 having an opening, and the end cap 2022 closing the opening of the housing 2021. Here, "closing" refers to covering or shutting down, and can be either sealed or unsealed.

[0099] The housing 2021 is a component used to house the electrode assembly 203. The housing 2021 can be a hollow structure with an opening at one end, or a hollow structure with openings at both opposite ends. The housing 2021 can have various shapes, such as cylindrical or cuboid. The housing 2021 can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy. The electrode assembly 203 can be partially or completely housed within the housing 2021.

[0100] End cap 2022 and housing 2021 together define a receiving space for accommodating electrode assembly 203 and other components. End cap 2022 can be connected to housing 2021 by welding, roll sealing, or other methods to close the opening of housing 2021. The shape of end cap 2022 can be adapted to the shape of housing 2021. For example, if housing 2021 is a cuboid structure, end cap 2022 can be a rectangular plate structure adapted to housing 2021; or if housing 2021 is a cylindrical structure, end cap 2022 can be a circular plate structure adapted to housing 2021. The material of end cap 2022 can also be various, such as copper, iron, aluminum, steel, aluminum alloy, etc. The materials of end cap 2022 and housing 2021 can be the same or different.

[0101] In an embodiment where the housing 2021 has an opening at one end, one end cap 2022 may be provided. In an embodiment where the housing 2021 has openings at both opposite ends, two end caps 2022 may be provided, with the two end caps 2022 respectively closing the two openings of the housing 2021, and the two end caps 2022 and the housing 2021 together defining the receiving space.

[0102] In some embodiments, the battery cell 20 may further include electrode terminals 201, which are disposed on the housing 202. The electrode terminals 201 are used for electrical connection with the tabs of the electrode assembly 203 to input or output electrical energy from the battery cell 20. The electrode terminals 201 may be disposed on the housing 2021 of the housing 202 or on the end cap 2022 of the housing 202. Electrode terminals 201 of different polarities of a battery cell 20 may be disposed on the same side of the housing 202 or on different sides of the housing 202. The electrode terminals 201 and the tabs may be directly connected, for example, by welding. The electrode terminals 201 and the tabs may also be indirectly connected, for example, by a current collector. The current collector may be a metallic conductor, such as copper, iron, aluminum, steel, or aluminum alloy.

[0103] As an example, in Figure 4 In the illustrated embodiment, one end of the housing 2021 is open, and there is one end cap 2022 in the outer shell 202, which closes one opening of the housing 2021. Two electrode terminals 201 are provided on the end cap 2022, namely a positive electrode terminal 201 and a negative electrode terminal 201. A positive electrode tab and a negative electrode tab are formed on the end of the electrode assembly 203 facing the end cap 2022. The positive electrode terminal 201 is electrically connected to the positive electrode tab, and the negative electrode terminal 201 is electrically connected to the negative electrode tab.

[0104] Please see Figure 5 , Figure 5 This is a schematic diagram of the structure of a battery device 100 provided in some embodiments of this application. Embodiments of this application provide a battery device 100, including a housing 10, a battery cell assembly 30, and a heating film 50. The housing 10 forms a receiving space 101 and includes a first wall 102. The battery cell assembly 30 is received in the receiving space 101 and includes a plurality of battery cells 20. Along the thickness direction X of the first wall, at least a portion of the heating film 50 is disposed between the first wall 102 and the battery cell assembly 30, and the heating film 50 is thermally connected to the battery cells 20. At least one battery cell 20 has a connection area 204 on its surface facing the first wall 102 that is not covered by the heating film 50, and the connection area 204 is connected to the first wall 102.

[0105] The housing 10 may include multiple walls, which together define the accommodating space 101. The first wall 102 may be any wall of the housing 10, such as the bottom wall, top wall, or side wall of the housing 10. Taking the housing 10 as an example, which includes a first housing 11 and a second housing 12, when the first housing 11 is located below the second housing 12, the first housing 11 is a hollow structure, the second housing 12 is a plate-like structure, the bottom wall may be located on the first housing 11, and the top wall may be located on the second housing 12.

[0106] The heating film 50 may include a film body and a heating conductor located within the film body. When the circuit containing the heating conductor is turned on, the heating conductor generates heat and transfers it outward through the film body. The heating conductor may be a resistance wire, which generates heat when its circuit is turned on. The heating film 50 may be partially disposed between the first wall 102 and the battery cell assembly 30, or the entire heating film 50 may be disposed between the first wall 102 and the battery cell assembly 30.

[0107] The heating film 50 is thermally connected to the battery cell 20 to heat the battery cell 20. The heating film 50 may comprise multiple independent parts, each electrically connected individually, with each individual part having two conductive terminals; alternatively, the heating film 50 may be a single unit with two conductive terminals.

[0108] The connection area 204 is a portion of the surface of the battery cell 20 facing the first wall 102. Regarding the configuration of the connection area 204, the area of ​​the heating film 50 can be set relatively small so that the heating film 50 cannot completely cover all the battery cells 20. This ensures that when the heating film 50 is located between the first wall 102 and the battery cell assembly 30, at least one battery cell 20 still has a connection area 204 not covered by the heating film 50. Alternatively, a cutout 501 can be provided on the heating film 50, so that the surface of the battery cell 20 at the location of the cutout 501 forms the connection area 204. In the battery cell assembly 30, the connection area 204 may exist in some of the battery cells 20, or it may exist in all of the battery cells 20.

[0109] The connection area 204 is connected to the first wall 102, either directly or indirectly through other connectors, such as adhesive.

[0110] The heating film 50 is thermally connected to the battery cell 20. This connection can be achieved by maintaining a certain gap between the heating film 50 and the battery cell 20, with the heating film 50 conducting heat through thermal radiation or through other components. Alternatively, the heating film 50 can be in direct contact with the battery cell 20, conducting heat through thermal conduction. For example, the heating film 50 can be connected to the first wall 102, or to the battery cell assembly 30. The heating film 50 can be connected to both the first wall 102 and the battery cell assembly 30 simultaneously. Alternatively, the heating film 50 can be positioned between the battery cell assembly 30 and the first wall 102, making contact with both, but not connected to either the battery cell assembly 30 or the first wall 102.

[0111] In the above embodiment, the heating film 50 is disposed between the battery cell assembly 30 and the first wall 102. The heating film 50 is thermally connected to the battery cell 20 so that the heating film 50 can heat the battery cell 20. By connecting the connection area 204 of the battery cell 20 that is not covered by the heating film 50 to the first wall 102, the fixing strength of the battery cell 20 can be improved, so that the battery cell 20 can be better fixed in the housing 10, thereby reducing the possibility of damage to the battery cell 20 due to movement of the battery cell 20 relative to the housing 10, and thus improving the reliability of the battery device 100.

[0112] In some embodiments, please refer to Figure 6 , Figure 6 This is a schematic diagram of the structure of a battery device 100 provided in some other embodiments of this application. The heating film 50 has a hollow portion 501, and the connecting area 204 is connected to the first wall 102 at the hollow portion 501.

[0113] The heating film 50 can be a single piece, with a notch formed to create a cutout 501, or it can be a single piece with a through hole to create a cutout 501. The heating film 50 can be a plurality of spaced heating parts 502, with the cutout 501 formed in the area between adjacent heating parts 502.

[0114] In the above embodiment, the heating film 50 has a hollow portion 501, and the connection area 204 of the battery cell 20 is connected to the first wall 102 at the hollow portion 501 position, so as to improve the fixing strength of the battery cell 20 and thereby improve the overall reliability of the battery device 100.

[0115] In some embodiments, please refer to Figure 7 and Figure 8 , Figure 7 This is a schematic diagram of the structure of the battery device 100 provided in some embodiments of this application. Figure 8 for Figure 7A schematic diagram showing the angles of the housing 10 and the heating film 50 is provided. The heating film 50 includes multiple heating elements 502, which are thermally connected to the battery cells 20. The heating elements 502 extend along a first direction Y, and the multiple heating elements 502 are spaced apart along a second direction Z. A cutout 501 is formed between two adjacent heating elements 502. A connection area 204 is formed on the surface of the multiple battery cells 20 in the battery cell assembly 30 facing the first wall 102, corresponding to the area of ​​the cutout 501. The thickness direction X of the first wall, the first direction Y, and the second direction Z are all perpendicular to each other.

[0116] Multiple heating elements 502, whether relatively independent or not, can all be considered part of the heating film 50. Each heating element 502 may include a film body and a heating conductor located within the film body. Any two heating elements 502 may be interconnected, forming a single circuit loop. Alternatively, any two heating elements 502 may not be interconnected, each forming its own circuit loop.

[0117] The multiple battery cells 20 in a battery cell assembly 30 can refer to at least two battery cells 20 in a battery cell assembly 30, or it can refer to all battery cells 20 in a battery cell assembly 30.

[0118] The extension direction of the heating part 502 can be the same as the arrangement direction of the battery cells 20 in the battery cell assembly 30, or it can be different from the arrangement direction of the battery cells 20.

[0119] In the above embodiment, the heating film 50 includes a plurality of heating parts 502 that are thermally connected to the battery cell 20. A hollow part 501 is formed between two adjacent heating parts 502. The connection area 204 of the battery cell 20 is connected to the first wall 102 at the hollow part 501 to improve the fixing strength of the battery cell 20 and thereby improve the overall reliability of the battery device 100.

[0120] In some embodiments, please refer to Figure 9 and Figure 10 , Figure 9 A schematic diagram of the structure of a battery device 100 provided in some embodiments of this application (showing the connection portion 503); Figure 10 for Figure 9 A schematic diagram showing the angle of the housing 10 and the heating film 50 is provided. The heating film 50 may also have at least one connecting part 503, through which two adjacent heating parts 502 are connected, so that the two adjacent heating parts 502 are electrically connected.

[0121] There can be one or more connecting parts 503. When there are two heating parts 502, there is one connecting part 503. When there are more than two heating parts 502, the number of connecting parts 503 can be set accordingly so that two adjacent heating parts 502 can be connected through one connecting part 503.

[0122] In the above embodiment, multiple heating elements 502 are connected by a connecting part 503 so that the multiple heating elements 502 can form a whole, and the heating film 50 formed has better stability in use; at the same time, the multiple heating elements 502 can also form a circuit loop through the connecting part 503, and the circuit layout can be more convenient.

[0123] In some embodiments, see still Figure 9 and Figure 10 Along the extending direction of the heating film 50, the heating part 502 and the connecting part 503 are alternately arranged.

[0124] The extension direction of the heating film 50 may include only one direction or multiple directions.

[0125] In the above embodiments, the heating part 502 and the connecting part 503 are arranged alternately, which facilitates the overall wiring of the circuit inside the heating film 50, reduces the setting of conductive wire bundles, thereby reducing the difficulty of arranging the internal circuit of the heating film 50 and improving the economy of the battery device 100.

[0126] In some embodiments, please refer to Figure 11 , Figure 11 This is a cross-sectional view of a heating section 502 provided in some embodiments of this application. The heating section 502 includes a first membrane body 5021 and a first heating conductor 5022 located within the first membrane body 5021. The connecting section 503 includes a second membrane body (not shown in the figure) and a second heating conductor (not shown in the figure) located within the second membrane body. The first membrane body 5021 and the second membrane body are integrally formed, and the first heating conductor 5022 and the second heating conductor are integrally formed.

[0127] The first heating conductor 5022 can be a wire or a resistance wire.

[0128] The heating film 50 can be die-cut to obtain multiple heating portions 502 that are spaced apart along the second direction Z and extend along the first direction Y, and at the same time obtain a connecting portion 503 that has a heating function.

[0129] In the above embodiments, by integrally forming multiple heating parts 502 with at least one connecting part 503, the connecting part 503 and the heating parts 502 have the same structure, which can improve the overall reliability of the heating film 50. Furthermore, the heating film 50 can be manufactured as a whole, without the need to manufacture multiple independent heating parts 502. This also reduces the manufacturing difficulty of the heating film 50 and improves its economic efficiency.

[0130] In some embodiments, please refer to Figure 12 and Figure 13 , Figure 12 This is a schematic diagram of the structure of a battery device 100 (including lead-out terminals 504) provided in some embodiments of this application. Figure 13 for Figure 12 A structural schematic diagram showing the angle of the housing 10 and the heating film 50 is shown. The heating part 502 includes a first film body 5021 and a first heating conductor 5022 located within the first film body 5021. The connecting part 503 is a conductive element that connects the first heating conductors 5022 of two adjacent heating parts 502.

[0131] The conductive component and the first heating conductor 5022 can be made of the same components, such as both being resistance wires; or they can be made of different components, such as the conductive component being a wire and the first heating conductor 5022 being a resistance wire. Compared to the first heating conductor 5022, the wire generates less heat when the circuit is conducting.

[0132] In the above embodiment, the connecting part 503 is only a conductive element, mainly realizing the electrical connection function, and does not provide a heating film 50. With this arrangement, multiple heating parts 502 can be formed into a whole, giving the heating film 50 better integrity, and also reducing the manufacturing cost of the heating film 50, thus improving the overall economy.

[0133] In some embodiments, see still Figure 12 and Figure 13 The housing 10 is provided with a first beam 103 and a second beam 104 arranged opposite each other along the first direction Y. A plurality of battery cells 20 in the battery cell assembly 30 are arranged between the first beam 103 and the second beam 104 along the first direction Y. At least one connecting part 503 includes a first connecting part 5031, which is located at one end of the heating part 502 near the first beam 103 along the first direction Y. Along the thickness direction X of the first wall, the first connecting part 5031 is at least partially located between the first beam 103 and the first wall 102.

[0134] The housing 10 may include side beams and a bottom wall. The side beams surround the bottom wall to form an accommodating space 101. An expansion beam may be provided inside the housing 10, and along the first direction Y, the expansion beam may be located on one side of the battery cell assembly 30. The first beam 103 may be a side beam, in which case the first beam 103 may be a solid structure, or the first beam 103 may be an expansion beam, in which case the first beam 103 may be a hollow structure. Correspondingly, the second beam 104 may be a side beam or an expansion beam. In some examples, when the first beam 103 and the second beam 104 are provided, both the first beam 103 and the second beam 104 may be side beams, both the first beam 103 and the second beam 104 may be expansion beams, or one of the first beam 103 and the second beam 104 may be a side beam and the other an expansion beam.

[0135] The expansion beam is a beam-like structure spanning the side walls of the housing 10. The space inside the housing 10 can be divided into two parts by the expansion beam. One part is the receiving space 101 defined by the expansion beam together with the side walls and bottom wall of the housing 10, which can accommodate multiple battery cells 20 arranged in an array. The other part can be the installation space for accommodating the battery management system (BMS), high-voltage box, etc. The expansion beam can be made of wall material or extruded profile. The expansion beam is constructed to bend and deform as the battery cells 20 within the receiving space 101 expand. The first connecting part 5031 and / or the second connecting part 5032 are disposed in the expansion beam, which can reduce the impact of placing the first connecting part 5031 and / or the second connecting part 5032 on the side beam of the housing 10, thereby making the area of ​​the connection area 204 of the battery cell 20 not covered by the heating film 50 larger, and thus making the connection area between the battery cell 20 and the first wall 102 larger, so as to improve the fixing strength of the battery cell 20 and further improve the reliability of the battery device 100.

[0136] There may be one or more connecting parts 503. When there is one connecting part 503, this connecting part 503 is the first connecting part 5031, and the first connecting part 5031 is located at one end of the heating part 502 along the first direction Y near the first beam 103. When there are multiple connecting parts 503, the multiple connecting parts 503 include the first connecting part 5031.

[0137] Along the thickness direction X of the first wall, the first connecting portion 5031 is at least partially located between the first beam 103 and the first wall 102. This can be because there is a gap between the first beam 103 and the first wall 102, and at least part of the first connecting portion 5031 is located in the gap; or a clearance notch can be provided between the first beam 103 and the first wall 102, so that at least part of the first connecting portion 5031 is located in the clearance notch.

[0138] The first connecting part 5031 may be located between the first beam 103 and the first wall 102, or the entire first connecting part 5031 may be located between the first beam 103 and the first wall 102.

[0139] In the above embodiment, the first connecting part 5031 is located between the first beam 103 and the first wall 102, which makes the area of ​​the connection area 204 of the battery cell 20 not covered by the heating film 50 larger, thereby making the connection area between the battery cell 20 and the first wall 102 larger, so as to improve the fixing strength of the battery cell 20 and further improve the reliability of the battery device 100.

[0140] In some embodiments, see still Figure 12 and Figure 13 And further reading Figure 14 , Figure 14 for Figure 13 A cross-sectional view of the first wall 102. Along the thickness direction X of the first wall, the first beam 103 abuts against the inner surface of the first wall 102. The side of the first beam 103 facing the first wall 102 is provided with a first clearance notch 1031. At least a portion of the first connecting part 5031 is located in the first clearance notch 1031.

[0141] The first beam 103 abuts against the inner surface of the first wall 102. The first beam 103 may be connected to the first wall 102, or the first beam 103 and the first wall 102 may only be in contact without being connected.

[0142] The first clearance notch 1031 can be one or more. When there is one first connecting portion 5031, one corresponding first clearance notch 1031 can be provided, such that at least a portion of the first connecting portion 5031 is located in the first clearance notch 1031. When there are multiple first connecting portions 5031, the number of first clearance notches 1031 can be less than the number of first connecting portions 5031, or the number of first clearance notches 1031 can be equal to the number of first connecting portions 5031. In some examples, when the number of first clearance notches 1031 is equal to the number of first connecting portions 5031, one first connecting portion 5031 corresponds to one first clearance notch 1031. In other examples, when the number of first clearance notches 1031 is less than the number of first connecting portions 5031, at least two of the first connecting portions 5031 can correspond to the same first clearance notch 1031. For example, when there are multiple first connecting parts 5031, the first clearance notch 1031 can be set to one, with each of the multiple first connecting parts 5031 corresponding to one first clearance notch 1031, so that at least a portion of each first connecting part 5031 is located in the first clearance notch 1031.

[0143] In the above implementation, the first beam 103 abuts against the inner surface of the first wall 102, which makes the housing 10 have better integrity and higher reliability. On this basis, a first clearance notch 1031 is provided on the side of the first beam 103 facing the first wall 102, so that at least a part of the first connecting part 5031 is located in the first clearance notch 1031. This allows the area of ​​the connection area 204 of the battery cell 20 not covered by the heating film 50 to be larger, thereby increasing the connection area between the battery cell 20 and the first wall 102, improving the fixing strength of the battery cell 20, and further improving the reliability of the battery device 100.

[0144] In some embodiments, see still Figure 14 A first filler 10311 is provided in the first clearance notch 1031, and the first filler 10311 is configured to press the first connecting part 5031 against the first wall 102.

[0145] The first filler 10311 can be a connector, which, when connected to the first wall 102, presses the first connecting portion 5031 against the first wall 102. The first filler 10311 can also be an elastic member, with its elastic ends abutting against the top walls of the first connecting portion 5031 and the first clearance notch 1031, respectively, to press the first connector against the first wall 102.

[0146] In the above embodiment, by providing a first filler 10311 and pressing the first connecting part 5031 against the first wall 102 with the first filler 10311, the first connecting part 5031 and the first wall 102 can be relatively fixed, thereby reducing the possibility of relative slippage between the first connecting part 5031 and the first wall 102.

[0147] In some embodiments, please refer back to the reference. Figure 13 At least one connecting portion 503 includes a second connecting portion 5032, which is located at one end of the heating portion 502 near the second beam 104 along the first direction Y and along the thickness direction X of the first wall. The second connecting portion 5032 is at least partially located between the second beam 104 and the first wall 102.

[0148] When there is only one connecting part 503, depending on its position, when the connecting part 503 is located at one end of the heating part 502 near the second beam 104 along the first direction Y, the connecting part 503 is the first connecting part 5031; when the connecting part 503 is located at one end of the heating part 502 near the second beam 104 along the first direction Y, the connecting part 503 is the second connecting part 5032. When there are multiple connecting parts 503, the multiple connecting parts 503 may include only the first connecting part 5031 or the second connecting part 5032, or the multiple connecting parts 503 may include both the first connecting part 5031 and the second connecting part 5032.

[0149] Along the thickness direction X of the first wall, the second connecting portion 5032 is at least partially located between the second beam 104 and the first wall 102. This can be because there is a gap between the second beam 104 and the first wall 102, and at least part of the second connecting portion 5032 is located in the gap; or a clearance notch can be provided between the second beam 104 and the first wall 102, so that at least part of the second connecting portion 5032 is located in the clearance notch.

[0150] The second connecting part 5032 may be located between the second beam 104 and the first wall 102, or the entire second connecting part 5032 may be located between the second beam 104 and the first wall 102.

[0151] In the above embodiment, the second connecting part 5032 is located between the second beam 104 and the first wall 102, which makes the area of ​​the connection area 204 of the battery cell 20 not covered by the heating film 50 larger, thereby making the connection area between the battery cell 20 and the first wall 102 larger, so as to improve the fixing strength of the battery cell 20 and further improve the reliability of the battery device 100.

[0152] In some embodiments, see still Figure 13 Along the thickness direction X of the first wall, the second beam 104 abuts against the inner surface of the first wall 102. A second clearance notch 1041 is provided on the side of the second beam 104 facing the first wall 102, and at least a portion of the second connecting part 5032 is located in the second clearance notch 1041.

[0153] The second limit abuts against the inner surface of the first wall 102. It can be that the second beam 104 is connected to the first wall 102, or the second beam 104 and the first wall 102 are only in contact without being connected.

[0154] The second clearance notch 1041 can be one or more. When there is one second connecting portion 5032, one corresponding second clearance notch 1041 can be provided, such that at least a portion of the second connecting portion 5032 is located in the second clearance notch 1041. When there are multiple second connecting portions 5032, the number of second clearance notches 1041 can be less than the number of second connecting portions 5032, or the number of second clearance notches 1041 can be equal to the number of second connecting portions 5032. In some examples, when the number of second clearance notches 1041 is equal to the number of second connecting portions 5032, one second connecting portion 5032 corresponds to one second clearance notch 1041. In other examples, when the number of second clearance notches 1041 is less than the number of second connecting portions 5032, at least two of the second connecting portions 5032 can correspond to the same second clearance notch 1041. For example, when there are multiple second connecting parts 5032, the second clearance notch 1041 can be set to one, with each of the multiple second connecting parts 5032 corresponding to one second clearance notch 1041, so that at least a portion of each second connecting part 5032 is located in the second clearance notch 1041.

[0155] In the above implementation, the second beam 104 abuts against the inner surface of the first wall 102, which makes the housing 10 have better integrity and higher reliability. On this basis, a second clearance notch 1041 is provided on the side of the second beam 104 facing the first wall 102, so that at least a portion of the second connecting part 5032 is located in the second clearance notch 1041. This allows the area of ​​the connection area 204 of the battery cell 20 not covered by the heating film 50 to be larger, thereby increasing the connection area between the battery cell 20 and the first wall 102, improving the fixing strength of the battery cell 20, and further improving the reliability of the battery device 100.

[0156] In some embodiments, refer to Figure 13 And return to refer to Figure 12 A second filler (not shown in the figure) is provided in the second clearance notch 1041. The second filler is configured to press the second connection 5032 against the first wall 102.

[0157] The second filler can have the same structure as the first filler 10311, or it can have a different structure. The second filler can be a connector, which, when connected to the first wall 102, presses the second connecting portion 5032 against the first wall 102. The second filler can also be an elastic member, with its elastic ends abutting against the top walls of the second connecting portion 5032 and the second clearance notch 1041, respectively, to press the second connector against the first wall 102.

[0158] In the above embodiment, by providing a second filler and pressing the second connecting part 5032 against the first wall 102 with the second filler, the second connecting part 5032 can be relatively fixed to the first wall 102, reducing the possibility of relative slippage between the second connecting part 5032 and the first wall 102.

[0159] In some embodiments, see still Figure 12 and Figure 13 And further reading Figure 15 , Figure 15 for Figure 13 BB cross-sectional view. The heating film 50 has two lead-out terminals 504, which are respectively connected to two heating parts 502. The second beam 104 is provided with a channel 1042 for at least one lead-out terminal 504 to pass through.

[0160] The lead-out terminal 504 is used to realize the electrical connection of the heating film 50. When the multiple heating parts 502 of the heating film 50 are connected to form a whole through the connecting part 503, the two lead-out terminals 504 are respectively connected to the beginning and end of the circuit arrangement of the heating film 50. Specifically, the two lead-out terminals 504 are respectively connected to the two heating parts 502.

[0161] There may be a gap between the second beam 104 and the first wall 102, which serves as a channel 1042 on the second beam 104; or there may be a slot on the second beam 104 facing the first wall 102, which serves as a channel 1042 on the second beam 104; or there may be a through hole on the second beam 104, which serves as a channel 1042 on the second beam 104.

[0162] Both leads 504 may pass through the second beam 104, or one lead 504 may pass through the second beam 104 and the other lead 504 may pass through the first beam 103. When a lead 504 passes through the first beam 103, a channel 1042 for the lead 504 to pass through is also provided on the first beam 103.

[0163] In the above embodiment, by providing a channel 1042 on the second beam 104, the lead-out terminal 504 of the heating film 50 can pass through the channel 1042 to support the connection of the heating film 50 to the power supply assembly, thereby realizing the electrical connection of the heating film 50.

[0164] In other embodiments, the first beam 103 may be provided with a channel 1042 through which at least one lead-out terminal 504 passes.

[0165] In some embodiments, see still Figure 15 Please refer to further information. Figure 16 , Figure 16 This is a schematic diagram of the structure of a battery device 100 provided in some embodiments of this application (showing protective member 10313). Protective member 10313 is provided in channel 1042 and is configured to separate the lead-out terminal 504 from the wall of channel 1042.

[0166] The protective element 10313 can be specifically configured according to the structure of the channel 1042. For example, when the channel 1042 is a slot on the second beam 104, the protective element 10313 may include a first protective part, a second protective part, and a third protective part connected end to end to form a U-shaped structure. The first protective part, the second protective part, and the third protective part are respectively disposed between the lead-out terminal 504 and the three groove walls of the slot. When the channel 1042 is a through hole on the second beam 104, the protective element 10313 may be provided with an annular part to wrap at least a portion of the lead-out terminal 504, so that the lead-out terminal 504 and the wall of the channel 1042 are separated by the protective element 10313.

[0167] In the above embodiment, by providing the protective member 10313, it is possible to prevent the lead-out terminal 504 from directly contacting the wall of the channel 1042, thereby reducing the possibility of damage to the lead-out terminal 504 due to wear between the lead-out terminal 504 and the wall of the channel 1042.

[0168] In some embodiments, please refer back to the reference. Figure 12 There are multiple battery cell assemblies 30, and the multiple battery cells 20 of each battery cell assembly 30 are thermally connected to at least one heating element 502. The multiple battery cell assemblies 30 are arranged along the second direction Z, and the multiple battery cells 20 of the battery cell assembly 30 are arranged along the first direction Y.

[0169] When there are multiple battery cell modules 30 and multiple heating elements 502, one battery cell module 30 may correspond to one heating element 502, one battery cell module 30 may correspond to multiple heating elements 502, or two battery cell modules 30 may correspond to one heating element 502.

[0170] In the above embodiment, the extending direction of the heating part 502 is the same as the arrangement direction of the plurality of battery cells 20 in the battery cell assembly 30, which enables one heating part 502 to be thermally connected to the plurality of battery cells 20, so that the heating effect of the plurality of battery cells 20 in the battery cell assembly 30 is more uniform and the heating effect is better.

[0171] In some embodiments, the heating film 50 connects the battery cell 20 and the first wall 102, and the connection strength between the connection area 204 and the first wall 102 is greater than the connection strength between the battery cell 20 and the heating film 50.

[0172] The heating film 50 can be connected to the battery cell 20 and the first wall 102 by adhesive bonding or by snap-fit.

[0173] In the above embodiment, the connection strength between the connection area 204 and the first wall 102 is greater than the connection strength between the battery cell 20 and the heating film 50. This can be used to support the existing battery device 100 with the heating film 50 having a hollowed-out portion 501, thereby improving the fixing strength of the battery cell 20 in the battery device 100 and thus improving the reliability of the battery device 100.

[0174] In some embodiments, the heating film 50 is bonded to the battery cell 20, and the connecting region 204 is bonded to the first wall 102. The bonding strength between the connecting region 204 and the first wall 102 is greater than the bonding strength between the battery cell 20 and the heating film 50. This configuration, by setting the bonding method and ensuring that the bonding strength between the connecting region 204 and the first wall 102 is greater than the bonding strength between the battery cell 20 and the heating film 50, improves the fixing strength of the battery cell 20 in the battery device 100, thereby improving the reliability of the battery device 100.

[0175] In some embodiments, the housing 10 includes a bottom wall that supports the battery cell assembly 30, and the first wall 102 is the bottom wall.

[0176] During the placement of the battery cell assembly 30 into the housing 10, the battery cell assembly 30 needs to be compressed before being placed inside the housing 10. This operation can improve the energy density of the battery device 100. If the heating film 50 is first placed on the battery cell assembly 30, then when the battery cell assembly 30 is compressed, the heating film 50 will wrinkle.

[0177] By first placing the heating film 50 on the housing 10 before packing the battery cell assembly 30, the impact of the compression process of the battery cell assembly 30 on the heating film 50 can be reduced. However, if the heating film 50 is placed on the side wall of the housing 10, it may still come into contact with the heating film 50 during the placement of the battery cell assembly 30, causing wrinkles to appear on the heating film 50.

[0178] Therefore, in the above embodiments, the heating film 50 is disposed between the bottom wall and the battery cell assembly 30, which can reduce the impact of the battery cell assembly 30 packaging process on the heating film 50, thereby improving the reliability of the battery device 100.

[0179] In some embodiments of this application, a battery device 100 is provided, including a housing 10, a battery cell assembly 30, and a heating film 50. The housing 10 forms a receiving space 101 and includes a bottom wall. A first beam 103 and a second beam 104, arranged opposite each other along a first direction Y, are disposed within the housing 10. The battery cell assembly 30 is received in the receiving space 101 and located between the two expansion beams. Multiple battery cell assemblies 30 are included, arranged along a second direction Z. Each battery cell assembly 30 includes multiple battery cells 20 arranged along the first direction Y. At least a portion of the heating film 50 is disposed between the bottom wall and the battery cell assembly 30 along the thickness direction of the bottom wall. The heating film 50 is thermally connected to the battery cells 20. The first direction Y, the second direction Z, and the thickness direction of the bottom wall are perpendicular to each other. The surface of the battery cell 20 facing the bottom wall has a connection area 204 not covered by the heating film 50, and the connection area 204 is connected to the bottom wall.

[0180] The heating film 50 includes a plurality of heating portions 502 spaced apart along a second direction Z. The heating portions 502 extend along a first direction Y, and a perforation 501 is formed between adjacent heating portions 502. A connecting area 204 is connected to the bottom wall at the perforation 501. The heating film 50 also includes a plurality of connecting portions 503, with one connecting portion 503 connecting adjacent heating portions 502. The heating portions 502 and connecting portions 503 are alternately arranged along the extending direction of the heating film 50. The connecting portion 503 includes a first connecting portion 5031 and a second connecting portion 5032. The first connecting portion 5031 is located at one end of the heating portion 502 along the first direction Y, close to the first beam 103. The second connecting portion 5032 is located at one end of the heating portion 502 along the first direction Y, close to the second beam 104. The first beam 103 abuts against the inner surface of the bottom wall. A first clearance notch 1031 is provided on the side of the first beam 103 facing the bottom wall. The second beam 104 abuts against the inner surface of the bottom wall. A second clearance notch 1041 is provided on the side of the second beam 104 facing the bottom wall. At least a portion of the first connecting portion 5031 is located in the first clearance notch 1031, and at least a portion of the second connecting portion 5032 is located in the second clearance notch 1041. A first filler 10311 is provided within the first clearance notch 1031, and the first filler 10311 is configured to press the first connecting portion 5031 against the bottom wall. A second filler 1041 is provided within the second clearance notch, and the second filler 1031 is configured to press the second connecting portion 5032 against the bottom wall. The heating film 50 has two lead-out terminals 504, which are respectively connected to two heating portions 502. The second beam 104 is provided with two channels 1042 through which the lead-out terminals 504 pass. A protective member 10313 is provided within the channel 1042, and the protective member 10313 is configured to separate the lead-out terminals 504 from the wall surface of the channel 1042. The heating film 50 is bonded to the battery cell 20, and the connecting area 204 is bonded to the first wall 102. The bonding strength between the connecting area 204 and the first wall 102 is greater than the bonding strength between the battery cell 20 and the heating film 50.

[0181] The heating section 502 includes a first membrane body 5021 and a first heating conductor 5022 located within the first membrane body 5021. The connecting section 503 may include a second membrane body and a second heating conductor located within the second membrane body. The first membrane body 5021 and the second membrane body are integrally formed, as are the first heating conductor 5022 and the second heating conductor. The connecting section 503 may also be a conductive element that connects the first heating conductors 5022 of two adjacent heating sections 502.

[0182] Both the first limiting part 103 and the second limiting part 104 are expansion beams.

[0183] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0184] 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 by, The application relates to a battery pack, comprising: a box body formed with a containing space, the box body comprising a first wall; a battery cell assembly contained in the containing space, the battery cell assembly comprising a plurality of battery cells; a heating film arranged between the first wall and the battery cell assembly along the thickness direction of the first wall, the heating film being in thermal contact with the battery cells; at least one surface of the battery cell assembly facing the first wall has a connecting area which is not covered by the heating film and is connected to the first wall.

2. The battery device according to claim 1, characterized by The heating film has a hollow part, and the connecting area is connected to the first wall at the position of the hollow part.

3. The battery device of claim 2, wherein, The heating film comprises a plurality of heating parts in thermal contact with the battery cells, the heating parts extending along a first direction, and a plurality of the heating parts are arranged at intervals along a second direction, and the hollow part is formed between two adjacent heating parts, and the connecting area is formed on the surface of the battery cell assembly facing the first wall and corresponding to the hollow part; the thickness direction of the first wall, the first direction and the second direction are perpendicular to each other.

4. The battery device of claim 3, wherein The heating film further comprises at least one connecting part, and two adjacent heating parts are connected through one connecting part so as to be electrically connected.

5. The battery device of claim 4, wherein, The heating parts and the connecting parts are arranged alternately along the extension direction of the heating film.

6. The battery device of claim 4, wherein The heating part comprises a first film body and a first heating conductor in the first film body, the connecting part comprises a second film body and a second heating conductor in the second film body, the first film body and the second film body are integrally formed, and the first heating conductor and the second heating conductor are integrally formed.

7. The battery device of claim 4, wherein The heating part comprises a first film body and a first heating conductor in the first film body, the connecting part is an electrically conductive piece, and the electrically conductive piece connects the first heating conductors of two adjacent heating parts.

8. The battery device of claim 4, wherein The box body is provided with a first beam body and a second beam body arranged oppositely along the first direction, and a plurality of the battery cells in the battery cell assembly are arranged between the first beam body and the second beam body along the first direction. At least one connecting part comprises a first connecting part located at one end of the heating part close to the first beam body along the first direction; along the thickness direction of the first wall, the first connecting part is at least partially located between the first beam body and the first wall.

9. The battery device of claim 8, wherein, Along the thickness direction of the first wall, the first beam body abuts against the inner surface of the first wall, one side of the first beam body facing the first wall is provided with a first avoiding notch, and at least part of the first connecting part is located in the first avoiding notch.

10. The battery device of claim 9, wherein, The first avoiding notch is provided with a first filling piece configured to press the first connecting part against the first wall.

11. The battery device of claim 8, wherein, At least one connecting part comprises a second connecting part located at one end of the heating part close to the second beam body along the first direction, and along the thickness direction of the first wall, the second connecting part is at least partially located between the second beam body and the first wall.

12. The battery device of claim 11, wherein, The second beam body is arranged against the inner surface of the first wall along the thickness direction of the first wall, and a second avoiding gap is arranged on the side of the second beam body facing the first wall, and at least part of the second connecting part is located in the second avoiding gap.

13. The battery device of claim 12, wherein, A second filling piece is arranged in the second avoiding gap, and the second filling piece is configured to press the second connecting part against the first wall.

14. The battery device of claim 8, wherein, The heating film has two lead-out terminals, and the two lead-out terminals are respectively connected with the two heating parts. The second beam body is provided with a channel for the at least one lead-out terminal to pass through.

15. The battery device of claim 14, wherein, A protection piece is arranged in the channel, and the protection piece is configured to separate the lead-out terminal and the wall surface of the channel.

16. The battery device of claim 3, wherein A plurality of battery cell assemblies are arranged, a plurality of battery cells of each battery cell assembly are in heat conduction connection with at least one heating part, a plurality of battery cell assemblies are arranged along the second direction, and a plurality of battery cells of the battery cell assembly are arranged along the first direction.

17. The battery device of any one of claims 1-16, wherein, The heating film is connected with the battery cell and the first wall, and the connection strength of the connection area and the first wall is greater than the connection strength of the battery cell and the heating film.

18. The battery device of claim 17, wherein, The heating film is bonded with the battery cell, the connection area is bonded with the first wall, and the bonding strength of the connection area and the first wall is greater than the bonding strength of the battery cell and the heating film.

19. The battery device according to any one of claims 1 to 16, wherein The box body includes a bottom wall, the bottom wall carries the battery cell assembly, and the first wall is the bottom wall.

20. An electrical device, comprising: The battery device includes any one of claims 1-19. The battery device includes any one of claims 1-19.

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