Battery device, electric device, and energy storage device

Abstract

The application discloses a battery device, a power utilization device and an energy storage device. The battery device comprises a battery monomer group, a heat conduction structure and at least one heat exchange component. The battery monomer group comprises a plurality of battery monomers arranged along a first direction; the heat conduction structure is arranged on at least one side of the battery monomers along the first direction; and the heat exchange component is arranged on at least one side of the battery monomer group along a second direction and connected with the heat conduction structure, and the second direction is perpendicular to the first direction. The battery device of the embodiment of the application can conduct the heat of each battery monomer to the heat exchange component for heat dissipation, or conduct the heat of the heat exchange component to each battery monomer for heating, so that good heat exchange can be achieved without arranging the heat exchange component between each battery monomer, which is beneficial to reducing the number of parts, lowering the production cost, saving the space in the battery device and improving the energy density of the battery device.

Description

Technical Field

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

[0002] New energy batteries are being used more and more widely in daily life and industry. For example, new energy vehicles equipped with batteries are already widely used. In addition, batteries are being used more and more in the field of energy storage.

[0003] With the continuous development of battery technology, how to reduce the weight of battery devices and increase their energy density has become one of the research topics in the industry. Summary of the Invention

[0004] To address the aforementioned technical problems, this application provides a lightweight, high-energy-density, and highly reliable battery device, power supply device, and energy storage device.

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

[0006] A first aspect of this application provides a battery device comprising: a battery cell group including a plurality of battery cells arranged along a first direction; a heat-conducting structure disposed on at least one side of the battery cells along the first direction; and at least one heat exchanger disposed on at least one side of the battery cell group along a second direction and connected to the heat-conducting structure, wherein the second direction is perpendicular to the first direction.

[0007] Therefore, the heat from each battery cell can be conducted to the heat exchanger for dissipation through the heat-conducting structure, or the heat from the heat exchanger can be conducted to the battery cells for heating. This achieves good heat exchange without requiring heat exchangers between each battery cell, reducing the number of components, lowering production costs, and saving space within the battery device, thus facilitating its lightweight and miniaturization. With the overall volume of the battery device remaining unchanged, the saved space can accommodate more battery cells, thereby increasing the energy density of the battery device.

[0008] In addition, by reducing the number of heat exchange components, the possibility of damage to the heat exchange components due to accidental impacts to the battery device can be reduced, which helps to improve the reliability of the battery device.

[0009] In some embodiments, the heat-conducting structure is bent toward the first direction from at least one side along the second direction, dividing the heat-conducting structure into a flat portion and a flanged portion, the flanged portion being connected to the heat exchanger.

[0010] Therefore, by connecting the flanged portion of the heat-conducting structure to the heat exchanger, the contact area between the two components can be increased, thereby improving heat exchange between individual battery cells and increasing their heat exchange efficiency. Furthermore, this also helps to improve the reliability of the connection between the heat-conducting structure and the heat exchanger.

[0011] In some embodiments, the battery cell includes a housing, the housing including a second surface disposed opposite to the second direction, the flange being located between the second surface and the heat exchanger, and the flange being bonded to the second surface by thermally conductive adhesive.

[0012] Therefore, by bonding the flanged part to the second surface, the connection reliability between the thermally conductive structure and the battery cell and heat exchanger can be improved.

[0013] In some embodiments, the size of the flange portion along the first direction is in the range of 5 mm to 10 mm.

[0014] This ensures that the size of the flange is within a suitable range, thereby improving connection stability while reducing production costs.

[0015] In some embodiments, the housing further includes a first surface disposed opposite to the first surface along the first direction, the first surface being the surface with the largest area in the housing, and the planar portion being connected to the first surface.

[0016] Therefore, the planar part of the heat-conducting structure can make contact with the large surface area of ​​the battery cell, resulting in a larger contact area between the heat-conducting structure and the battery cell, thereby better conducting heat from the battery cell or conducting heat to the battery cell, and further improving the heat conduction efficiency of the battery cell.

[0017] In some embodiments, within the same projection plane perpendicular to the first direction, the projection of the first surface falls within the projection range of the planar portion of the heat-conducting structure.

[0018] This allows for better and more uniform heat conduction to the battery cells, reducing temperature differences between different parts of the battery cells and resulting in a more uniform temperature distribution, which is beneficial for improving the performance and lifespan of the battery cells.

[0019] In some embodiments, the thermal conductivity of the thermally conductive structure is in the range of 1000 W / m·K to 1800 W / m·K.

[0020] This ensures that the thermal conductivity of the heat-conducting structure is within a reasonable range, enabling better and faster heat exchange between battery cells and achieving better heat conduction.

[0021] In some embodiments, the thickness of the thermally conductive structure is in the range of 100 μm to 1000 μm.

[0022] This allows the thickness of the heat-conducting structure to be within a reasonable range, achieving good heat conduction while saving space within the battery device and improving space utilization, thereby contributing to increased energy density.

[0023] In some embodiments, the thermally conductive structure includes any one of graphene sheets, aluminum foil, aluminum-magnesium alloy foil, titanium foil, or silver foil.

[0024] The above materials all have high thermal conductivity and excellent thermal conductivity, which can improve the thermal conduction efficiency of battery cells.

[0025] In some embodiments, a plurality of fins are formed on two surfaces opposite to each other along the first direction of the heat-conducting structure; and / or a plurality of spaced-apart grooves are formed on two surfaces opposite to each other along the first direction of the heat-conducting structure.

[0026] This increases the contact area between the heat-conducting structure and the surface of the battery cell, thereby improving the heat conduction efficiency of the heat-conducting structure and further accelerating the heat exchange efficiency of the battery cell.

[0027] In some embodiments, the thermally conductive structure includes a graphene electrothermal layer and an insulating layer, the insulating layer being disposed on opposite sides of the graphene electrothermal layer along the first direction, the graphene electrothermal layer integrating conductive elements, the conductive elements extending beyond the insulating layer.

[0028] Therefore, electricity can be passed through the graphene heating layer via conductive elements, thereby converting electrical energy into heat energy to heat the battery cells. When no electricity is applied, the graphene heating layer can conduct the heat from the battery cells to the heat exchanger for heat dissipation. It is not necessary to set heat exchangers between each battery cell, and the graphene heating layer can simultaneously heat and dissipate heat from the battery cells. This helps to reduce the number of components, lower production costs, and save space within the battery device, allowing more battery cells to be placed and increasing the energy density of the battery device.

[0029] In addition, insulating layers are provided on opposite sides of the graphene electrothermal layer along the first direction, which can reduce the possibility of leakage or short circuit in the graphene electrothermal layer, better heat or dissipate heat from the battery cells, and improve the reliability of the thermal conductive structure.

[0030] In some embodiments, the thermally conductive structure further includes an adhesive layer located between the insulating layer and the graphene electrothermal layer, for bonding the insulating layer and the graphene electrothermal layer.

[0031] Therefore, the insulating layer and the graphene heating layer can be bonded together through the adhesive layer, allowing them to fit better and further improving the reliability of the graphene heating layer.

[0032] In some embodiments, the insulating layer comprises at least one of polyimide and polyethylene.

[0033] Polyimide and polyethylene have excellent physical, chemical, and dimensional properties, as well as good mechanical properties and heat resistance. They are not easily damaged in high-temperature environments, which helps to improve the reliability of the thermally conductive structure and thus better dissipate heat and heat the battery cells.

[0034] In some embodiments, the thermally conductive structure includes a thermally conductive layer and a heating layer, wherein the heating layer is located on at least one side of the thermally conductive layer along the first direction.

[0035] Therefore, when the temperature of a battery cell is too high, heat can be conducted to the heat exchanger through the heat-conducting layer to dissipate heat from the battery cell. Conversely, when the temperature of a battery cell is too low, the temperature can be increased through the heating layer to raise the temperature of the battery cell. This allows the battery cells in the battery device to operate within a normal temperature range, thereby improving the performance and lifespan of the battery device.

[0036] In some embodiments, the thermally conductive layer comprises any one of graphene sheet, aluminum foil, aluminum-magnesium alloy foil, titanium foil, or silver foil; and / or the heating layer comprises any one of thermocouple layer or thermistor layer, wherein the wire portion of the thermocouple layer or thermistor layer extends beyond the thermally conductive layer.

[0037] Graphene sheets, aluminum foil, aluminum-magnesium alloy foil, titanium foil, or silver foil have high thermal conductivity and excellent thermal performance, thereby improving the thermal transfer efficiency of individual battery cells and enabling rapid cooling or heating. Thermocouple layers or thermistor layers can heat up rapidly when energized, thus achieving rapid temperature increase for the individual battery cells.

[0038] In some embodiments, each of the heat-conducting structures has two heat-conducting layers, and the heating layer is located between the two heat-conducting layers.

[0039] This allows the surface of each battery cell to be connected to the heat-conducting layer of the heat-conducting structure, enabling the heat-conducting layer to conduct heat generated by the battery cell more quickly, achieving rapid heat dissipation, or enabling the heat-conducting layer to conduct heat to the battery cell more quickly, achieving rapid temperature rise. This allows the battery cell to be maintained within the normal operating temperature range, which is beneficial to improving the working reliability and service life of the battery cell, thereby improving the reliability and service life of the overall battery device.

[0040] In some embodiments, the thermally conductive layer has a plurality of fins formed on the side facing the surface of the battery cell; and / or the thermally conductive layer has a plurality of spaced grooves formed on the side facing the surface of the battery cell.

[0041] This increases the contact area between the heat-conducting layer and the surface of the battery cell, thereby improving the heat conduction efficiency of the heat-conducting layer and further accelerating the heat exchange efficiency of the battery cell.

[0042] In some embodiments, the battery device further includes a housing, in which the battery cell groups are housed; a thermally conductive structure is located between two adjacent battery cells within each battery cell group; and / or; the thermally conductive structure is located between the battery cell and the inner wall of the housing adjacent to the battery cell.

[0043] Therefore, the heat-conducting structure can be located between adjacent battery cells along the first direction, or between a battery cell and the inner wall of the casing adjacent to the battery cell. This allows for good heat exchange between each battery cell within the casing, enabling rapid cooling when the battery cell is too hot and rapid heating when the temperature is too low. Furthermore, there is no need to install heat exchange components between the individual battery cells, which helps reduce the overall weight of the battery device and improves its space utilization.

[0044] In some embodiments, the battery device further includes a housing, in which the battery cell assembly is housed, the housing including side beams and a bottom protective plate; the heat exchanger includes a first heat exchanger disposed between the side beams and the battery cell assembly and connected to the heat-conducting structure; and / or the heat exchanger includes a second heat exchanger disposed between the bottom protective plate and the battery cell assembly and connected to the heat-conducting structure.

[0045] The heat exchange components include a first heat exchange component and / or a second heat exchange component. The first heat exchange component is located between the side beam of the housing and the battery cell assembly, and the second heat exchange component is located between the bottom protective plate of the housing and the battery cell assembly. Both the first and second heat exchange components are connected to a heat-conducting structure. Therefore, without the need for heat exchange components between the battery cells, the heat from the battery cells can be conducted to the heat exchange components via the heat-conducting structure, or vice versa, thereby achieving heat dissipation or heating of the battery cells. This reduces the number of heat exchange components and lightens the overall weight of the battery device. Furthermore, it saves space within the battery device, improving space utilization and thus increasing the overall energy density of the battery device.

[0046] In addition, the reduced number of heat exchange components also reduces the possibility of heat exchange medium leakage due to damage to the heat exchange components caused by accidental impacts to the battery device, which helps to improve the reliability of the battery device.

[0047] A second aspect of this application provides an electrical device that includes a battery device as described in the first aspect of this application for providing electrical energy.

[0048] The electrical device of this application embodiment includes the battery device provided in the first aspect, which is lightweight, has high energy density and high reliability. Therefore, it is beneficial to achieve overall lightweighting of the electrical device, extend the power supply time of the battery device to the electrical device, reduce the time spent on maintenance, and has high reliability and good stability.

[0049] In some embodiments, the electrical device includes an aircraft.

[0050] A third aspect of this application provides an energy storage device, which includes a battery device as described in the first aspect of this application for storing or providing electrical energy.

[0051] The energy storage device of this application embodiment includes the battery device provided in the first aspect, which is lightweight, has high energy density and high reliability. Therefore, it is beneficial to achieve overall lightweighting of the energy storage device, extend the power supply time of the battery device to the energy storage device, and reduce the time spent on maintenance. It also has high reliability and good stability.

[0052] Invention Effects

[0053] This application provides a lightweight, high-energy-density, and reliable battery device, power supply device, and energy storage device. Attached Figure Description

[0054] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0055] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0056] Figure 2 Exploded perspective view of a battery device provided for some embodiments of this application;

[0057] Figure 3 A three-dimensional structural schematic diagram of a battery cell provided for some embodiments of this application;

[0058] Figure 4 A partial planar structural schematic diagram of an electrode assembly provided for some embodiments of this application;

[0059] Figure 5 Schematic diagram of partial planar structure of battery device provided for some embodiments of this application Figure 1 ;

[0060] Figure 6 Schematic diagram of partial planar structure of battery device provided for some embodiments of this application Figure 2 ;

[0061] Figure 7 Schematic diagram of partial planar structure of battery device provided for some embodiments of this application Figure 3 ;

[0062] Figure 8 Schematic diagram of partial planar structure of battery device provided for some embodiments of this application Figure 4 ;

[0063] Figure 9 Schematic diagram of partial planar structure of battery device provided for some embodiments of this application Figure 5 ;

[0064] Figure 10 Schematic diagram of the exploded three-dimensional structure of the thermally conductive structure provided for some embodiments of this application;

[0065] Figure 11 A schematic diagram of a planar structure for a heat-conducting structure provided in some embodiments of this application.

[0066] Explanation of reference numerals in the attached figures

[0067] 1. Battery cell; 11. First surface; 12. Second surface; 1a. Electrode assembly; 1aa. Positive electrode; 1ab. Negative electrode; 1ac. Separator; 2. Thermally conductive structure; 21. Planar portion; 22. Flanged portion; 23. Graphene electrothermal layer; 24. Insulating layer; 25. Conductive element; 26. Adhesive layer; 27. Thermally conductive layer; 28. Heating layer; 3. Heat exchanger; 31. First heat exchanger; 32. Second heat exchanger; 4. Housing; 4a. First housing; 4b. Second housing; 10. Battery cell pack; 100. Battery device; 200. Controller; 300. Motor; 1000. Vehicle. Detailed Implementation

[0068] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0069] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein 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 are intended to cover non-exclusive inclusion.

[0070] In the description of the embodiments of this application, technical terms such as "first," "second," and "third" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0071] In this document, the term "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 throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0072] In the description of the embodiments 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, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0073] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0074] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0075] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0076] The following is a detailed description of this application.

[0077] Currently, new energy batteries are being used more and more widely in daily life and industry. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing.

[0078] The temperature inside a battery pack is affected by the external environment. The individual battery cells within the pack need to operate within a certain normal temperature range. If the temperature of a battery cell exceeds or falls below this range, it will significantly impact the performance and lifespan of the battery pack. For example, in hot weather, the battery pack needs to cool the individual cells to maintain the required temperature within the pack; in cold weather, the battery cells need to be heated to keep the internal temperature within a suitable range.

[0079] In related technologies, heat exchangers are typically placed between adjacent battery cells to dissipate heat or increase the temperature of the battery cells, enabling them to operate within a normal temperature range. However, these heat exchangers usually have a certain thickness and internal channels for the flow of the heat exchange medium. Therefore, they occupy a large space and are relatively heavy within the battery device, which is detrimental to achieving lightweight battery devices and improving their energy density.

[0080] Furthermore, since heat exchangers are installed between adjacent battery cells, there are numerous tubes and connectors connecting these heat exchangers, resulting in a large number of installation and sealing interfaces (e.g., installation interfaces between tubes and connectors). If proper sealing is not implemented, the heat exchange medium within the heat exchangers may leak from these interfaces, affecting the heat exchange of the battery cells. Moreover, the numerous installation interfaces increase the likelihood of damage and leakage to the heat exchangers when the battery assembly is subjected to accidental impacts or collisions.

[0081] Especially for battery devices used in aerospace and other fields, the unique application environment places higher demands on the energy density, weight and reliability of the battery devices.

[0082] This application addresses the problems existing in the aforementioned related technologies by proposing a battery device, which includes a battery cell assembly, a heat-conducting structure, and at least one heat exchanger. The battery cell assembly includes a plurality of battery cells arranged along a first direction; the heat-conducting structure is disposed on at least one side of the battery cells along the first direction; the heat exchanger is disposed on at least one side of the battery cell assembly along a second direction and is connected to the heat-conducting structure, wherein the second direction is perpendicular to the first direction.

[0083] The battery device of this application embodiment can conduct heat from each battery cell to a heat exchanger for heat dissipation through a heat-conducting structure, or conduct heat from the heat exchanger to each battery cell for heating. This achieves good heat exchange without requiring heat exchangers between each battery cell, reducing the number of components, lowering production costs, and saving space within the battery device, thus facilitating its lightweight and miniaturization. With the overall volume of the battery device remaining unchanged, the saved space can accommodate more battery cells, thereby increasing the energy density of the battery device.

[0084] In addition, by reducing the number of heat exchange components, the installation and sealing interfaces of the heat exchange components can be reduced, which reduces the possibility of damage to the heat exchange components due to accidental impacts to the battery device, thus improving the reliability of the battery device.

[0085] The battery apparatus provided in this application embodiment can be used, but is not limited to, in energy storage power systems, vehicles, ships or aircraft and other electrical devices, as well as in energy storage containers, energy storage cabinets and other energy storage devices.

[0086] This application provides an electrical device that includes the aforementioned battery device for providing electrical energy. The electrical device includes, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, and spacecraft. 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.

[0087] In the following embodiments, for ease of explanation, an example of an electrical device of this application, namely a vehicle 1000, will be used for illustration.

[0088] Figure 1The diagram illustrates the structure of a vehicle as 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 vehicles, etc. Figure 1 As shown, 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 power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. 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, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0089] 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.

[0090] Below, refer to Figures 2 to 11 Some embodiments of this application will be described in detail.

[0091] Figure 2 Exploded perspective view of a battery device provided for some embodiments of this application; Figure 3 A three-dimensional structural schematic diagram of a battery cell provided for some embodiments of this application; Figure 4 A partial planar structural schematic diagram of an electrode assembly provided for some embodiments of this application; Figures 5 to 9 A partial planar structural schematic diagram of a battery device provided for some embodiments of this application; Figure 10 Schematic diagram of the exploded three-dimensional structure of the thermally conductive structure provided for some embodiments of this application; Figure 11 A schematic diagram of a planar structure for a heat-conducting structure provided in some embodiments of this application.

[0092] In some embodiments of this application, for ease of explanation, a first direction and a second direction are defined, and the first direction and the second direction are perpendicular to each other. However, those skilled in the art should understand that the embodiments of this application are not limited to the case where the two directions are perpendicular to each other. For ease of explanation, as... Figures 4 to 9 As shown by the arrows in the diagram, the direction of arrow X is the first direction, and the direction of arrow Y is the second direction.

[0093] The first aspect of this application provides a battery device 100, such as Figures 5 to 9As shown, the battery device 100 includes a battery cell pack 10, a heat-conducting structure 2, and at least one heat exchanger 3. The battery cell pack 10 includes a plurality of battery cells 1 arranged along a first direction. The heat-conducting structure 2 is located on at least one side of the battery cells 1 along the first direction. The heat exchanger 3 is located on at least one side of the battery cell pack 10 along a second direction and is connected to the heat-conducting structure 2, wherein the second direction is perpendicular to the first direction.

[0094] The battery device 100 is used to provide voltage and capacity.

[0095] Battery cell 1 can be a secondary battery. A secondary battery is a battery cell 1 that can be recharged to activate the active materials and continue to be used after it has been discharged.

[0096] The battery cell 1 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0097] The battery cell 1 includes an electrode assembly 1a, which is the component in the battery cell 1 where the electrochemical reaction takes place. The electrode assembly 1a includes a positive electrode 1aa, a negative electrode 1ab, and a separator 1ac. The positive electrode 1aa, negative electrode 1ab, and separator 1ac are typically stacked along the thickness direction (first direction) of the battery cell 1. During the charging and discharging process of the battery cell 1, active ions (e.g., lithium ions) repeatedly insert and extract between the positive electrode 1aa and the negative electrode 1ab. The separator 1ac is disposed between the positive electrode 1aa and the negative electrode 1ab, which serves to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0098] The electrode assembly 1a can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0099] In some embodiments, electrode assembly 1a has a wound structure. The positive electrode 1aa and the negative electrode 1ab are wound into a wound structure.

[0100] In some embodiments, the electrode assembly 1a has a stacked structure.

[0101] As an example, such as Figure 4 As shown, multiple positive electrode plates 1aa and multiple negative electrode plates 1ab can be set, and multiple positive electrode plates 1aa and multiple negative electrode plates 1ab are stacked alternately.

[0102] As an example, multiple positive electrode plates 1aa can be provided, and multiple negative electrode plates 1ab can be folded to form multiple stacked folded segments, with a positive electrode plate 1aa sandwiched between adjacent folded segments.

[0103] As an example, both the positive electrode 1aa and the negative electrode 1ab are folded to form multiple stacked folded segments.

[0104] As an example, multiple separators 1ac can be provided, each positioned between any adjacent positive or negative electrode plates.

[0105] As an example, the separator 1ac can be continuously arranged and disposed between any adjacent positive electrode 1aa or negative electrode 1ab by means of folding or rolling.

[0106] In some embodiments, the battery cell 1 further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte, which can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0107] In some embodiments, the electrode assembly 1a is provided with tabs that can conduct current from the electrode assembly 1a. The tabs include a positive tab and a negative tab.

[0108] In some embodiments, the battery cell 1 may include a housing. The housing is used to encapsulate components such as the electrode assembly 1a and the electrolyte. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0109] In the battery device 100, there can be multiple battery cells 1. Multiple battery cells 1 can be connected in series, in parallel, or in a mixed manner to form a battery cell group 10. A mixed connection means that multiple battery cells 1 are connected in both series and parallel.

[0110] The battery device 100 may also include other structures, for example, the battery device 100 may also include a busbar for realizing electrical connection between multiple battery cells 1.

[0111] The heat-conducting structure 2 is a structural component for heat conduction between individual battery cells 1 within the battery device 100. The heat-conducting structure 2 is located on at least one side of the battery cell 1 along the first direction and is generally in the form of a thin film. The thin film-shaped heat-conducting structure 2 has a small thickness, which can make the structure within the battery device 100 more compact while ensuring heat conduction performance, effectively improving the space utilization rate inside the battery device 100, thereby helping to improve the energy density of the battery device 100.

[0112] In addition, the thermally conductive structure 2 has a shape that is roughly the same as the surface of the attached battery cell 1, so that it can better fit the surface of the battery cell 1 and better realize the heat exchange of the battery cell 1.

[0113] For example, the heat-conducting structure 2 may be located between adjacent battery cells 1 within each battery cell group 10.

[0114] As another example, the heat-conducting structure 2 may be located between the battery cell 1 and the inner wall of the housing 4.

[0115] In the embodiments of this application, the thermally conductive structure 2 can be a single-layer thin film structure with a high thermal conductivity, or it can be a multi-layer composite thin film structure that integrates other functional film layers.

[0116] Heat exchanger 3 refers to the structural component used for heat exchange between the battery cell 1.

[0117] The heat exchanger 3 can be, for example, a liquid-cooled plate, a water-cooled plate, or any other device capable of heat exchange. In a specific embodiment, the heat exchanger 3 is a water-cooled plate, and a heat exchange channel for the flow of a heat exchange medium such as water is formed inside the heat exchanger 3. An inlet and an outlet can be connected to the upstream and downstream sections of the heat exchange channel, respectively. When the temperature of the battery cell 1 is high, a cooling medium can be introduced into the heat exchange channel through the inlet to accelerate the heat dissipation of the battery cell 1. When the temperature of the battery cell 1 is low, a high-temperature medium can be introduced into the heat exchange channel through the inlet to heat the battery cell 1, thereby ensuring that the battery cell 1 within the battery device 100 always operates within a normal temperature range, improving the performance and lifespan of the battery device 100.

[0118] In this embodiment, the heat exchanger 3 is generally flat and plate-shaped, located on at least one side of the battery cell assembly 10 along the second direction, and connected to the heat-conducting structure 2.

[0119] In some other embodiments, the heat exchanger 3 may also be in any other suitable shape. The embodiments of this application do not specifically limit the shape of the heat exchanger 3.

[0120] In this embodiment, the thickness direction of the battery cell 1 can be referred to as the first direction, and the direction in which the two first surfaces 11 face each other can also be referred to as the first direction. The first direction can also be the direction in which the positive electrode 1aa, negative electrode 1ab, and separator 1ac of the electrode assembly 1a are stacked. Those skilled in the art should understand that when the electrode assembly 1a is a wound structure, it includes a curved section and a straight section. In this case, the stacking direction of the positive electrode 1aa, negative electrode 1ab, and separator 1ac in the straight section is the first direction. In this embodiment, any direction perpendicular to the first direction can be referred to as the second direction. For example, the height direction of the battery cell 1 and the length direction of the battery cell 1 can both be referred to as the second direction.

[0121] The heat exchanger 3 is located on at least one side of the battery cell group 10 along the second direction. This can mean that the heat exchanger 3 is located on the bottom side, the top side of the battery cell group 10, or on the side where the sidewall of the battery cell 1 is located within the battery cell group 10. In some embodiments, there can be multiple heat exchangers 3, and multiple heat exchangers 3 can be located simultaneously on the bottom side, the top side of the battery cell group 10, and the side where the sidewall of the battery cell 1 is located within the battery cell group 10.

[0122] Since the heat-conducting structure 2 is connected to the heat exchanger 3, the heat of each battery cell 1 can be conducted to the heat exchanger 3 for heat dissipation through the heat-conducting structure 2, or the heat of the heat exchanger 3 can be conducted to each battery cell 1 for heating through the heat-conducting structure 2. Therefore, it is not necessary to set the heat exchanger 3 between each battery cell 1 to achieve good heat exchange, which helps to reduce the number of parts, reduce assembly difficulty, and reduce production costs.

[0123] Furthermore, it can save space within the battery device 100, which is beneficial for the lightweighting and miniaturization of the battery device 100. With the overall volume of the battery device 100 remaining unchanged, the saved space can accommodate more battery cells 1, thereby increasing the energy density of the battery device 100.

[0124] In addition, by reducing the number of heat exchanger elements 3, the number of installation and sealing interfaces during the assembly of heat exchanger elements 3 is reduced, thereby reducing the possibility of damage or leakage to heat exchanger elements 3 due to accidental impacts to the battery device 100, which helps to improve the reliability of the battery device 100.

[0125] In some embodiments, such as Figure 9 As shown, there can be multiple battery cell groups 10, and the multiple battery cell groups 10 are arranged along the second direction.

[0126] Thus, multiple battery cell groups 10 are grouped together along the second direction to form a battery cell module, thereby further increasing the energy density of the battery device 100.

[0127] Within the battery cell module, the heat-conducting structure 2 between each battery cell group 10 is formed as an integral structure, and the heat-conducting structure 2 of each integral structure is connected to the heat exchanger 3 on at least one side along the second direction.

[0128] In some embodiments of this application, such as Figure 7 and Figure 8 As shown, the heat-conducting structure 2 is bent toward the first direction along at least one side of the second direction, dividing the heat-conducting structure 2 into a flat part 21 and a flanged part 22, and the flanged part 22 is connected to the heat exchanger 3.

[0129] The flat portion 21 and the flanged portion 22 are generally flat, which facilitates better connection between the two and the surface of the battery cell 1 or the surface of the heat exchanger 3, thereby improving the connection reliability.

[0130] Therefore, by connecting the flanged portion 22 of the heat-conducting structure 2 with the heat exchanger 3, the contact area between the heat-conducting structure 2 and the heat exchanger 3 can be increased, thereby achieving better heat exchange of the battery cell 1 and improving the heat exchange efficiency of the battery cell 1. In addition, it is also beneficial to improve the connection reliability between the heat-conducting structure 2 and the heat exchanger 3.

[0131] exist Figure 7 In the specific example shown, the heat-conducting structure 2 is bent towards the first direction on one side (the side facing the sidewall of the battery cell 1) along the second direction to form a flange 22. In some other embodiments, the heat-conducting structure 2 may be bent towards the first direction on both sides along the second direction to form two flanges 22.

[0132] exist Figure 7 In the specific example shown, the heat-conducting structure 2 is bent upward along the first direction to form a flange 22. In some other embodiments, the heat-conducting structure 2 may also be bent downward along the first direction to form a flange 22.

[0133] exist Figure 8 In the specific example shown, the heat-conducting structure 2 is bent towards the first direction on one side of the second direction (the side facing the bottom wall of the battery cell 1) to form a flange 22. In some other embodiments, the heat-conducting structure 2 may be bent towards the first direction on the other side of the second direction (the side facing the top cover of the battery cell 1) to form a flange 22, or the heat-conducting structure 2 may be bent towards the first direction on both sides of the second direction to form two flanges 22.

[0134] exist Figure 8 In the specific example shown, the heat-conducting structure 2 is bent to the left along the first direction to form a flange 22. In some other embodiments, the heat-conducting structure 2 may also be bent to the right along the first direction to form a flange 22.

[0135] This application does not specifically limit the formation method of the flange 22, as long as the flange 22 can be connected to the heat exchanger 3.

[0136] Those skilled in the art should understand that the heat-conducting structure 2 may have only one flange 22 or multiple flanges 22. The embodiments of this application do not specifically limit the number and formation position of the flanges 22, as long as the heat-conducting structure 2 can be connected to the heat exchanger 3 through the flanges 22. Alternatively, in some other embodiments, the heat-conducting structure 2 may not have flanges 22, and the heat-conducting structure 2 can be directly connected to the heat exchanger 3 through its end.

[0137] In some embodiments of this application, the battery cell 1 includes a housing, the housing includes a second surface 12 disposed opposite to the second direction, a flange 22 is located between the second surface 12 and the heat exchanger 3, and the flange 22 is bonded to the second surface 12 by thermally conductive adhesive.

[0138] like Figure 3 , Figure 7 and Figure 8 As shown, the housing includes two first surfaces 11 opposite each other along a first direction and a second surface 12 connected to the first surfaces 11. All surfaces of the battery cell 1 housing other than the first surfaces 11 can be referred to as the second surface 12.

[0139] The first surface 11 is typically the large surface of the battery cell 1, i.e., the surface with the largest area. The second surface 12 is the surface that is adjacent to and connected to the first surface 11. For example, the top wall (top cover), bottom wall, and side wall of the battery cell 1 can all be referred to as the second surface 12.

[0140] The planar portion 21 of the heat-conducting structure 2 is connected to the first surface 11, and the flanged portion 22 is connected to the second surface 12.

[0141] For example, the thermally conductive structure 2 can be bent to the blue film window area of ​​the second surface 12 of the battery cell 1. The blue film window area refers to the area on the blue film of the battery cell that is not covered by the blue film but is pre-cut or designed. This area is coated with thermally conductive adhesive to facilitate the bonding and fixing of the battery cell to other components. The flange 22 is bonded to the second surface 12 with thermally conductive adhesive, which can reduce the possibility of the flange 22 shifting, thereby improving the connection reliability between the thermally conductive structure 2 and the battery cell 1 and the heat exchanger 3.

[0142] For example, the thermally conductive adhesive can be a thermally conductive structural adhesive.

[0143] Thermally conductive structural adhesive is an adhesive that combines thermal conductivity and structural strength. It has good thermal conductivity and mechanical properties, which can ensure the reliable connection between the flange 22 and the second surface 12, while also effectively conducting heat from the heat exchanger 3 or transferring heat from the battery cell 1 to the heat exchanger 3.

[0144] In some embodiments of this application, the size of the flange 22 along the first direction is in the range of 5 mm to 10 mm.

[0145] This ensures that the size of the flange 22 is within a suitable range, thereby improving connection stability while reducing the size of the flange 22 from being too large and lowering production costs.

[0146] For example, the dimensions of the flange portion 22 along the first direction can be 5mm, 6mm, 7mm, 8mm, 9mm or 10mm, etc.

[0147] In some embodiments of this application, the housing further includes a first surface 11 disposed opposite to each other along a first direction, the first surface 11 being the surface with the largest area in the housing, and the planar portion 21 being connected to the first surface 11.

[0148] Therefore, the planar portion 21 of the heat-conducting structure 2 can make contact with the large surface of the battery cell 1, making the contact area between the heat-conducting structure 2 and the battery cell 1 larger, thereby better conducting the heat of the battery cell 1 or better conducting heat to the battery cell 1, and further improving the heat conduction efficiency of the battery cell 1.

[0149] In some embodiments of this application, the projection of the first surface 11 falls within the projection range of the planar portion 21 of the heat-conducting structure 2 in the same projection plane perpendicular to the first direction.

[0150] Therefore, the surface area of ​​the planar portion 21 of the heat-conducting structure 2 is greater than or equal to the surface area of ​​the first surface 11 of the battery cell 1, thereby completely covering the first surface 11. This allows for better and more uniform heat conduction to the battery cell 1, reducing temperature differences between different parts of the battery cell 1. Consequently, the temperature distribution of the battery cell 1 becomes uniform, which is beneficial for improving the performance and lifespan of the battery cell 1.

[0151] In some embodiments of this application, the thermal conductivity of the heat-conducting structure 2 is in the range of 1000 W / m·K to 1800 W / m·K.

[0152] Thermal conductivity, also known as thermal conductivity, is an important physical quantity that measures a material's ability to conduct heat. It is defined as the amount of heat transferred per unit time through a 1-square-meter area under steady-state heat transfer conditions, when the material thickness is 1 meter and the temperature difference between its two surfaces is 1 degree Celsius (K or °C). The unit of thermal conductivity is usually watts per meter per Kelvin (W / (m·K)), but it is sometimes expressed in joules per square meter Kelvin (J / (m·K)) in the International System of Units (SI). The magnitude of thermal conductivity has a significant impact on the heat insulation or heat dissipation performance of a material. For example, materials with low thermal conductivity perform well in heat insulation, while materials with high thermal conductivity are suitable for applications requiring rapid heat transfer.

[0153] The thermal conductivity of the thermally conductive structure 2 is within a reasonable range, which enables better and faster heat exchange of the battery cell 1 and achieves better thermal conductivity.

[0154] In some embodiments of this application, the thickness of the thermally conductive structure 2 is in the range of 100 μm to 1000 μm.

[0155] The thickness of the heat-conducting structure 2 is generally the dimension of the heat-conducting structure 2 along the first direction. When the heat-conducting structure 2 includes a flat portion 21 and a flanged portion 22, the thickness of the heat-conducting structure 2 may refer to the dimension of the flat portion 21 along the first direction or the dimension of the flanged portion 22 along the second direction.

[0156] The thickness of the heat-conducting structure 2 is within a reasonable range. While achieving good heat conduction, it saves space inside the battery device 100 and improves the space utilization rate inside the battery device 100. This is conducive to achieving the overall lightweighting of the battery device 100. Moreover, without changing the overall volume of the battery device 100, it can accommodate more battery cells 1 inside the battery device 100, thereby effectively improving the energy density of the battery device 100.

[0157] For example, the thickness of the heat-conducting structure 2 can be 100μm, 200μm, 300μm, 400μm, 500μm, 600μm, 700μm, 800μm, 900μm or 1000μm, etc.

[0158] In some embodiments of this application, the thermally conductive structure 2 includes any one of graphene sheet, aluminum foil, aluminum-magnesium alloy foil, titanium foil, or silver foil.

[0159] The above materials all have high thermal conductivity and excellent thermal conductivity, which can improve the thermal conduction efficiency of battery cell 1.

[0160] In this embodiment, the thermally conductive structure 2 can be a thermally conductive structure 2 made of a single-layer material with high thermal conductivity.

[0161] For example, the thermal conductivity of graphene can be greater than or equal to 1400 W / (m·k), thereby enabling the single-layer thermally conductive structure 2 made of graphene to quickly conduct the heat generated by the battery cell 1.

[0162] In addition, the graphene thermally conductive structure is relatively thin, thus effectively improving the space utilization rate inside the battery device 100 while ensuring thermal conductivity.

[0163] Those skilled in the art will understand that in some other embodiments, the thermally conductive structure 2 may also be made of any other suitable material with high thermal conductivity.

[0164] In some embodiments of this application, although not shown in the figures, a plurality of fins are formed on two surfaces of the heat-conducting structure 2 that are opposite to each other along the first direction; and / or a plurality of spaced grooves are formed on two surfaces of the heat-conducting structure 2 that are opposite to each other along the first direction.

[0165] Therefore, the contact area between the heat-conducting structure 2 and the surface of the battery cell 1 can be increased by the fins and grooves, thereby improving the heat conduction efficiency of the heat-conducting structure 2 and further accelerating the heat exchange efficiency of the battery cell 1.

[0166] When the heat-conducting structure 2 includes a planar portion 21 and a flanged portion 22, fins or grooves are typically formed on two surfaces of the planar portion 21 that are opposite to each other along a first direction.

[0167] In some embodiments of this application, such as Figure 10 As shown, the heat-conducting structure 2 includes a graphene electrothermal layer 23 and an insulating layer 24. The insulating layer 24 is disposed on opposite sides of the graphene electrothermal layer 23 along the first direction. The graphene electrothermal layer 23 integrates a conductive element 25, and the conductive element 25 extends beyond the insulating layer 24.

[0168] Graphene films are typically film structures formed by stacking and extending sheets of nano-graphene material. Graphene electrothermal layer 23, on the other hand, is a flexible and dense film structure formed by adding conductive particles between the graphene material layers. The conductive particles can be configured as conductive elements 25, through which an external voltage is applied to the graphene electrothermal layer 23, i.e., current is supplied to the graphene electrothermal layer 23.

[0169] In some embodiments, metal electrode leads can also be bonded to the graphene electrothermal film, and the metal electrode leads are configured as conductive elements 25.

[0170] In some embodiments, conductive fillers may also be coated onto the graphene electrothermal film.

[0171] When electricity is applied to the graphene heating layer 23, electrons collide in the graphene, generating resistance. This resistance causes the electron flow to generate heat (also known as the Joule heating principle or resistance heating principle). Due to the high thermal conductivity of graphene, the heat can be quickly conducted to the entire surface of the graphene heating layer 23, thereby enabling the entire graphene heating layer 23 to heat up rapidly.

[0172] In addition, during the heating process, the carbon molecules in the graphene heating layer 23 can generate phonons, ions and electrons in the resistance, and the friction and collision between the generated carbon molecule clusters (also known as Brownian motion) can also generate heat energy.

[0173] Therefore, electricity can be supplied to the graphene heating layer 23 through the conductive element 25, thereby converting electrical energy into heat energy to heat the battery cell 1. When no electricity is supplied, the graphene heating layer 23 can also conduct the heat of the battery cell 1 to the heat exchanger 3 for heat dissipation due to the high thermal conductivity of graphene. It is not necessary to set heat exchangers 3 between each battery cell 1. The graphene heating layer 23 can simultaneously heat and dissipate heat from the battery cell 1, which helps to reduce the number of parts and reduce production costs. At the same time, it helps to save space inside the battery device 100. With the overall volume of the battery device 100 unchanged, more battery cells 1 can be placed inside, thereby increasing the energy density of the battery device 100.

[0174] In addition, insulating layers 24 are provided on opposite sides of the graphene heating layer 23 along the first direction, which can reduce the possibility of leakage or short circuit in the graphene heating layer 23, better heat or dissipate heat from the battery cell 1, and improve the reliability of the heat conduction structure 2.

[0175] Those skilled in the art should understand that since the graphene heating layer 23 can also heat the battery cell 1, when the power is on, the graphene heating layer 23 can also act as a heat exchanger of the battery device 100. While heating itself, it can also quickly conduct heat from the heat exchanger 3, thereby further accelerating the heating of the battery cell 1.

[0176] In some embodiments, a graphene electrothermal layer 23 may be coated on the side of the heat exchanger 3 facing the surface of the battery cell 1, and a common single-layer thermally conductive structure (e.g., graphene film) with a high thermal conductivity may be provided on the side of the battery cell 1 along the first direction, and the thermally conductive structure 2 is connected to the graphene electrothermal layer 23.

[0177] In other embodiments, the graphene heating layer 23 can directly replace the heat exchanger 3 in the battery device 100. When it is necessary to heat the battery cell 1, the graphene heating layer 23 is energized and the heat generated by the graphene heating layer 23 is conducted through the heat-conducting structure 2. When it is not necessary to heat the battery cell 1, the energization of the graphene heating layer 23 is stopped. The graphene heating layer 23 can conduct the heat generated by the battery cell 1 together with the heat-conducting structure 2, thereby accelerating the heat dissipation of the battery cell 1.

[0178] In some embodiments of this application, the thermally conductive structure 2 further includes an adhesive layer 26, which is located between the insulating layer 24 and the graphene electrothermal layer 23, and is used to bond the insulating layer 24 and the graphene electrothermal layer 23.

[0179] Therefore, the insulating layer 24 and the graphene heating layer 23 can be bonded together through the adhesive layer 26, so that the two can be better bonded together, and the reliability of the graphene heating layer 23 can be further improved.

[0180] The adhesive layer 26 may be, for example, a thermally conductive adhesive.

[0181] In some embodiments of this application, the insulating layer 24 includes at least one of polyimide and polyethylene.

[0182] Polyimide and polyethylene have excellent physical properties, chemical properties, and dimensional stability, as well as excellent mechanical properties and good heat resistance. They are not easily damaged in high-temperature environments, which helps to improve the reliability of the thermally conductive structure 2 and thus better dissipate heat and heat the battery cell 1.

[0183] In some embodiments of this application, such as Figure 11 As shown, the heat-conducting structure 2 includes a heat-conducting layer 27 and a heating layer 28, with the heating layer 28 located on at least one side of the heat-conducting layer 27 along a first direction.

[0184] Therefore, when the temperature of the battery cell 1 is too high, heat can be conducted to the heat exchanger 3 through the heat-conducting layer 27 to dissipate heat from the battery cell 1. When the temperature of the battery cell 1 is too low, the heating layer 28 and the heat exchanger 3 can be heated simultaneously to increase the temperature of the battery cell 1. This allows the battery cell 1 in the battery device 100 to operate within the normal temperature range, thereby improving the performance and service life of the battery device 100.

[0185] In some embodiments of this application, the thermally conductive layer 27 includes any one of graphene sheet, aluminum foil, aluminum-magnesium alloy foil, titanium foil, or silver foil; and / or the heating layer 28 includes any one of thermocouple layer or thermistor layer, wherein the metal wire portion of the thermocouple layer or thermistor layer extends beyond the thermally conductive layer 27.

[0186] Graphene sheets, aluminum foil, aluminum-magnesium alloy foil, titanium foil, or silver foil have high thermal conductivity and excellent thermal conductivity, which can improve the thermal conduction efficiency of battery cell 1 and achieve rapid cooling or heating of battery cell 1.

[0187] The thermocouple layer or thermistor layer can heat up rapidly when energized, thereby achieving rapid heating of the battery cell 1.

[0188] In some embodiments of this application, each heat-conducting structure 2 has two heat-conducting layers 27, and the heating layer 28 is located between the two heat-conducting layers 27.

[0189] For example, when there are multiple battery cells 1, the heat-conducting structure 2 can be located between adjacent battery cells 1 in each battery cell group 10. In this case, the heat-conducting structure 2 includes two heat-conducting layers 27 and a heating layer 28, thereby forming a three-layer stacked structure. The heating layer 28 is located between the two heat-conducting layers 27, and the two heat-conducting layers 27 are respectively connected to the first surface 11 of the adjacent battery cells 1.

[0190] Therefore, the surface of each battery cell 1 can be connected to the heat-conducting layer 27 of the heat-conducting structure 2, so that the heat-conducting layer 27 can conduct the heat generated by the battery cell 1 more quickly, achieving rapid heat dissipation, or the heat-conducting layer 27 can conduct heat to the battery cell 1 more quickly, achieving rapid heating, so that the battery cell 1 can be maintained within the normal operating temperature range, which is beneficial to improving the working reliability and service life of the battery cell 1, thereby improving the overall reliability and service life of the battery device 100.

[0191] As another example, the heat-conducting structure 2 may also include only a heating layer 28 and a heat-conducting layer 27, thereby forming a double-layered structure. The heat-conducting layer 27 is connected to one surface of a battery cell 1, and the heating layer 28 is connected to one surface of an adjacent battery cell 1. That is, the two surfaces of a battery cell 1 that are opposite to each other along the first direction are respectively connected to the heat-conducting layer 27 and the heating layer 28 of the two heat-conducting structures 2.

[0192] As another example, the heat-conducting structure 2 can also be located between the battery cell 1 and the inner wall of the housing. In this case, the heat-conducting structure 2 can include a heating layer 28 and a heat-conducting layer 27, with the heat-conducting layer 27 connected to the surface of the battery cell 1.

[0193] Of course, those skilled in the art should understand that the heat-conducting structure 2 located between adjacent battery cells 1 can also form a multi-layered stacked structure, that is, include more stacked heat-conducting layers 27 and heating layers 28. The heat-conducting structure 2 located between the battery cell 1 and the casing 4 can also form a multi-layered stacked structure, that is, include two or more heat-conducting layers 27 and heating layers 28. When there are multiple heat-conducting structures 2, the number of layers in the stacked structure of each heat-conducting structure 2 can be the same or different, and the arrangement of the stacked structure of each heat-conducting structure 2 can be the same or different. The embodiments of this application do not specifically limit the number and arrangement of the stacked heat-conducting layers 27 and heating layers 28 of each heat-conducting structure 2.

[0194] In some embodiments of this application, the thermally conductive layer 27 has a plurality of fins on the side facing the surface of the battery cell 1; and / or the thermally conductive layer 27 has a plurality of spaced grooves on the side facing the surface of the battery cell 1.

[0195] This increases the contact area between the heat-conducting layer 27 and the surface of the battery cell 1, thereby improving the heat conduction efficiency of the heat-conducting layer and further accelerating the heat exchange efficiency of the battery cell 1.

[0196] In some embodiments of this application, such as Figure 2 As shown, the battery device 100 also includes a housing 4, in which the battery cell group 10 is housed. A heat-conducting structure 2 is located between two adjacent battery cells 1 within each battery cell group 10, and / or between the battery cell 1 and the inner wall of the housing 4 adjacent to the battery cell 1.

[0197] The housing 4 is the external protective shell of the battery device 100, and an enclosed space is formed inside. Since the battery cell pack 10 is located in the enclosed space of the housing 4, the housing 4 can provide a certain degree of protection for the battery cell pack 10, thereby reducing the possibility of damage to the individual battery cells 1 of the battery cell pack 10 due to mechanical collision or thermal runaway.

[0198] like Figure 2 As shown, the housing 4 may include a first housing 4a and a second housing 4b. The first housing 4a and the second housing 4b are fastened together to form a closed space inside the housing 4 to house the battery cell pack 10. Here, "closed" refers to covering or closing, which can be sealed or not sealed. The first housing 4a may be a top cover and the second housing 4b may be a bottom plate, or the first housing 4a may be a bottom plate and the second housing 4b may be a top cover.

[0199] As an example, the housing 4 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing forms a closed space to accommodate the battery cells 1.

[0200] In some embodiments, the housing 4 is part of the chassis structure of the vehicle 1000. For example, a portion of the housing 4 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 4 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0201] The heat-conducting structure 2 can be located between adjacent battery cells 1 along the first direction, or between the battery cell 1 and the inner wall of the housing 4 adjacent to the battery cell 1. This allows for good heat exchange between each battery cell 1 within the housing 4, enabling rapid cooling of the battery cell 1 when the temperature is too high and rapid heating when the temperature is too low. Furthermore, there is no need to install heat exchange components between the individual battery cells 1, which helps to reduce the overall weight of the battery device 100 and improve the space utilization of the battery device 100.

[0202] In some embodiments of this application, the battery device 100 further includes a housing 4, in which the battery cell group 10 is housed, and the housing 4 includes side beams and a bottom protective plate. The heat exchanger 3 includes a first heat exchanger 31, which is disposed between the side beams and the battery cell group 10 and connected to the heat-conducting structure 2; and / or the heat exchanger 3 includes a second heat exchanger 32, which is disposed between the bottom protective plate and the battery cell group 10 and connected to the heat-conducting structure 2.

[0203] The heat exchanger 3 includes a first heat exchanger 31 and / or a second heat exchanger 32. The first heat exchanger 31 is located between the side beam of the housing 4 and the battery cell group 10, and the second heat exchanger 32 is located between the bottom guard plate of the housing 4 and the battery cell group 10. Both the first heat exchanger 31 and the second heat exchanger 32 are connected to the heat-conducting structure 2. Thus, it is not necessary to set the heat exchanger 3 between the battery cells 1. The heat of the battery cells 1 can be conducted to the heat exchanger 3 through the heat-conducting structure 2 or the heat of the heat exchanger 3 can be conducted to the battery cells 1, thereby realizing the heat dissipation or heating of the battery cells 1. This reduces the number of heat exchangers 3 and lightens the overall weight of the battery device 100.

[0204] Furthermore, it can make full use of the space on the bottom and sides of the housing 4, thereby improving the space utilization rate of the housing 4 of the battery device 100. With the overall volume of the housing 4 remaining unchanged, more battery cells 1 can be accommodated in the housing 4, which is conducive to improving the overall energy density of the battery device 100.

[0205] In addition, the reduction in the number of heat exchange components 3 can reduce the possibility of heat exchange medium leakage due to damage to the heat exchange components 3 caused by accidental impact to the battery device 100, which is beneficial to improving the reliability of the battery device 100.

[0206] Those skilled in the art should understand that the battery device 100 may include only the first heat exchanger 31, only the second heat exchanger 32, or both the first heat exchanger 31 and the second heat exchanger 32.

[0207] A second aspect of this application provides an electrical device that includes a battery device 100 as described in the first aspect of this application for providing electrical energy.

[0208] The electrical device of this application embodiment includes the battery device 100 provided in the first aspect, which is lightweight, has high energy density, and high reliability. Therefore, it is beneficial to achieve overall lightweighting of the electrical device, extend the power supply time of the battery device 100 to the electrical device, reduce the risk of the electrical device malfunctioning due to battery device 100 failure, reduce the time spent on maintenance, and has high reliability and good stability.

[0209] In some embodiments of this application, the electrical device includes an aircraft.

[0210] Aircraft generally refer to machines that fly within or outside the atmosphere (space), and can include aircraft that fly within the atmosphere and spacecraft that fly in space.

[0211] Aircraft can include airplanes, airships, etc., and for example, low-altitude aircraft, eVTOL (electric vertical take-off and landing) aircraft, commuter aircraft, regional aircraft, etc.

[0212] Spacecraft can include airplanes, rockets, space shuttles, and spacecraft.

[0213] A third aspect of this application provides an energy storage device, which includes a battery device 100 as described in the first aspect of this application for storing or providing electrical energy.

[0214] The energy storage device of this application embodiment includes the battery device 100 provided in the first aspect, which is lightweight, has high energy density, and high reliability. Therefore, it is beneficial to achieve overall lightweighting of the energy storage device, extend the power supply time of the battery device 100 to the energy storage device, reduce the risk of failure of the energy storage device due to failure of the battery device 100, reduce the time spent on maintenance, and has high reliability and good stability.

[0215] The following describes specific examples of some embodiments of this application with reference to the accompanying drawings.

[0216] As a specific example, the battery device 100 uses a high thermal conductivity film (thermal structure 2) to transfer heat from the large surface (first surface 11) of the battery cell. The high thermal conductivity film can be a thermally conductive graphene film with a thermal conductivity ≥1000w / m K, or a thermally conductive and heatable graphene sheet (graphene heating layer 23), or a thermally conductive graphene film (thermal layer 27) with a heating thermocouple (heating layer 28) in the middle.

[0217] The thickness of the high thermal conductivity film is in the range of 100μm to 1mm. Compared with the 3 to 5mm thickness of the harmonica tube-type water cooling plate in related technologies, the high thermal conductivity film design saves internal space of the battery device 100, and reduces the number of water cooling plates, welding joints and dual-color connecting pipes. The distance between the large surfaces (first surface 11) of the battery cells (battery cells 1) is changed from 5mm in the original water cooling plate to 1mm of high thermal conductivity film for heat dissipation, saving 4mm of space. A total of 132mm can be saved in the Y direction (first direction) of the battery cells, which means that at least two more rows of battery cells can be placed in the battery device 100, which is beneficial to improving the energy density of the battery device 100.

[0218] In addition, the battery assembly also includes a cooling plate (heat exchanger 3). The cooling plate is designed at the side beam of the housing 4 and is connected to a high thermal conductivity film. The heat from the battery cell is conducted out through the high thermal conductivity film and then carried away by the coolant in the water-cooled plate, thus achieving centralized heat dissipation. The water-cooled plate at the side beam occupies less space and is connected to the high thermal conductivity film by bonding with an interface coupling thermally conductive adhesive. The structure is simple, reducing the risk of water-cooled plate cracking or joint detachment and leakage when the large water-cooled plate is subjected to impact. It also helps to improve the space utilization of the housing 4.

[0219] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and all should be covered within the scope of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way.

Claims

1. A battery device, characterized in that, The battery device includes: A battery cell pack, comprising a plurality of battery cells arranged along a first direction; A thermally conductive structure is disposed on at least one side of the battery cell along the first direction; and At least one heat exchanger is placed on at least one side of the battery cell assembly along a second direction and connected to the heat-conducting structure, wherein the second direction is perpendicular to the first direction.

2. The battery device according to claim 1, characterized in that, The heat-conducting structure is bent toward the first direction from at least one side along the second direction, dividing the heat-conducting structure into a flat part and a flanged part, and the flanged part is connected to the heat exchanger.

3. The battery device according to claim 2, characterized in that, The battery cell includes a housing, the housing includes a second surface disposed opposite to the second direction, the flange is located between the second surface and the heat exchanger, and the flange is bonded to the second surface by thermally conductive adhesive.

4. The battery device according to claim 2 or 3, characterized in that, The dimensions of the flanged portion along the first direction are in the range of 5mm to 10mm.

5. The battery device according to claim 3, characterized in that, The housing also includes a first surface disposed opposite to the first surface along the first direction, the first surface being the surface with the largest area in the housing, and the planar portion being connected to the first surface.

6. The battery device according to any one of claims 2 to 5, characterized in that, Within the same projection plane perpendicular to the first direction, the projection of the first surface falls within the projection range of the planar portion of the heat-conducting structure.

7. The battery device according to any one of claims 1 to 6, characterized in that, The thermal conductivity of the thermally conductive structure is in the range of 1000 W / m·K to 1800 W / m·K.

8. The battery device according to any one of claims 1 to 7, characterized in that, The thickness of the thermally conductive structure is in the range of 100 μm to 1000 μm.

9. The battery device according to any one of claims 1 to 8, characterized in that, The thermally conductive structure includes any one of graphene sheets, aluminum foil, aluminum-magnesium alloy foil, titanium foil, or silver foil.

10. The battery device according to claim 9, characterized in that, The heat-conducting structure has multiple fins formed on two surfaces opposite to each other along the first direction; and / or The heat-conducting structure has multiple spaced grooves formed on two surfaces opposite to each other along the first direction.

11. The battery device according to any one of claims 1 to 8, characterized in that, The thermally conductive structure includes a graphene electrothermal layer and an insulating layer. The insulating layer is disposed on opposite sides of the graphene electrothermal layer along the first direction. The graphene electrothermal layer integrates conductive elements, and the conductive elements extend beyond the insulating layer.

12. The battery device according to claim 11, characterized in that, The thermally conductive structure further includes an adhesive layer located between the insulating layer and the graphene electrothermal layer, which is used to bond the insulating layer and the graphene electrothermal layer.

13. The battery device according to claim 11 or 12, characterized in that, The insulating layer includes at least one of polyimide and polyethylene.

14. The battery device according to any one of claims 1 to 8, characterized in that, The heat-conducting structure includes a heat-conducting layer and a heating layer, wherein the heating layer is located on at least one side of the heat-conducting layer along the first direction.

15. The battery device according to claim 14, characterized in that, The thermally conductive layer comprises any one of graphene sheet, aluminum foil, aluminum-magnesium alloy foil, titanium foil, or silver foil; and / or The heating layer includes either a thermocouple layer or a thermistor layer, wherein the metal wire portion of the thermocouple layer or the thermistor layer extends beyond the heat-conducting layer.

16. The battery device according to claim 14 or 15, characterized in that, Each of the aforementioned heat-conducting structures has two heat-conducting layers, with the heating layer located between the two heat-conducting layers.

17. The battery device according to any one of claims 14 to 16, characterized in that, The thermally conductive layer has multiple fins formed on the side facing the surface of the battery cell; and / or The thermally conductive layer has multiple spaced grooves on the side facing the surface of the battery cell.

18. The battery device according to any one of claims 1 to 17, characterized in that, The battery device also includes a housing, in which the battery cell pack is housed; The thermally conductive structure is located between two adjacent battery cells within each battery cell group; and / or; The heat-conducting structure is located between the battery cell and the inner wall of the housing adjacent to the battery cell.

19. The battery device according to any one of claims 1 to 18, characterized in that, The battery device also includes a housing, in which the battery cell pack is housed, and the housing includes side beams and a bottom protective plate; The heat exchanger includes a first heat exchanger, which is positioned between the side beam and the battery cell assembly and connected to the thermally conductive structure; and / or The heat exchanger includes a second heat exchanger, which is placed between the bottom protective plate and the battery cell assembly, and is connected to the heat-conducting structure.

20. An electrical device, characterized in that, The electrical device includes a battery device according to any one of claims 1 to 19 for providing electrical energy.

21. The electrical appliance according to claim 20, characterized in that, The electrical equipment includes aircraft.

22. An energy storage device, characterized in that, The energy storage device includes a battery device according to any one of claims 1 to 19 for storing or providing electrical energy.

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