Battery device and electric device

Abstract

The utility model discloses a battery device and a power utilization device, and belongs to the technical field of batteries. The battery device comprises a box body assembly, a battery monomer assembly and a heat exchange assembly, a containing cavity is formed in the box body assembly. The battery monomer assembly is accommodated in the accommodating cavity and comprises a battery monomer and a bus piece; the battery monomer comprises a shell and an electrode terminal, the shell is provided with a first wall, the electrode terminal is arranged on the first wall, and the bus piece is connected with the electrode terminal so as to realize electric connection of the battery monomer assembly. The heat exchange assembly is arranged in the containing cavity and attached to the confluence piece. The heat exchange assembly comprises at least two flexible parts, the at least two flexible parts are arranged in a stacked mode, at least one flow channel is formed between the flexible parts, and the flow channel is used for containing a heat exchange medium. According to the technical scheme provided by the invention, the reliability of the battery monomer can be improved.

Description

Technical Field

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

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

[0003] In the development of battery technology, in addition to improving the performance of battery devices, the reliability of battery devices is also an issue that needs to be considered.

[0004] Therefore, how to improve the reliability of battery devices is an urgent problem to be solved in battery technology. Utility Model Content

[0005] Embodiments of the present application provide a battery device and an electrical device, which can improve the reliability of the battery device.

[0006] In the first aspect, an embodiment of the present application provides a battery device, comprising a box assembly, a battery cell assembly and a heat exchange assembly. The box assembly has a storage cavity inside. The battery cell assembly is accommodated in the storage cavity, and the battery cell assembly includes a battery cell and a busbar. The battery cell includes an outer shell and an electrode terminal, the outer shell has a first wall, the electrode terminal is arranged on the first wall, and the busbar is connected to the electrode terminal to achieve electrical connection of the battery cell assembly. The heat exchange assembly is arranged in the storage cavity, and the heat exchange assembly is attached to the busbar. Among them, the heat exchange assembly includes at least two flexible parts, the at least two flexible parts are stacked, and at least one flow channel is formed between the flexible parts, and the flow channel is used to accommodate a heat exchange medium.

[0007] In the above technical solution, on the one hand, the busbar is connected to the electrode terminal, and the heat exchange component is attached to the busbar, so that the heat exchange component in the battery device of this structure can be thermally connected to the electrode terminal of the battery cell through the busbar, thereby realizing temperature regulation of the busbar and the electrode terminal, thereby reducing the risk of excessive temperature of the busbar and the electrode terminal caused by heat generation during the discharge and charging process of the battery cell, thereby improving the reliability of the battery device; on the other hand, the heat exchange component includes at least two flexible parts, at least two flexible parts are stacked, and at least one flow channel is formed between the flexible parts, and the flow channel is used to accommodate heat exchange medium, so that the heat exchange component of this structure can be better attached to the busbar, thereby making the heat exchange area between the heat exchange component and the busbar larger, thereby making the temperature regulation effect of the busbar better; on the other hand, the flexible part can deform to reduce the volume of the flow channel, thereby facilitating the discharge of the heat exchange medium, thereby reducing the risk of heat exchange medium leakage when the battery device is not in use, thereby improving the reliability of the battery device.

[0008] In some embodiments, the heat exchange assembly includes a first area and a second area, the first area is attached to the manifold, and the second area is attached to the first wall.

[0009] In the above technical solution, the second area is attached to the first wall so that the heat exchange component can regulate the temperature of the manifold, thereby reducing the risk of the battery cell being overheated or underheated, thereby improving the reliability of the battery device.

[0010] In some embodiments, the battery device further includes a heat conductor, wherein a portion of the heat conductor is disposed between the first region and the current collector, and another portion of the heat conductor is disposed between the second region and the first wall.

[0011] In the above technical solution, a portion of the heat conductor is arranged between the first area and the bus bar, and another portion of the heat conductor is arranged between the second area and the first wall. Then, through the heat uniforming effect of the heat conductor, the temperature difference between the first wall and the bus bar of the battery cell is reduced, thereby improving the cooling capacity of the heat exchange assembly on the battery cell assembly as a whole, which is beneficial to improving the reliability of the battery device.

[0012] In some embodiments, the heat conducting member is a thermally conductive adhesive.

[0013] In the above technical solution, the heat conductive member is a thermally conductive adhesive. On the one hand, the heat conductive member can be used to fix the heat exchange assembly and the battery cell assembly; on the other hand, it can facilitate heat transfer so that the heat exchange assembly can adjust the temperature of the battery cell assembly.

[0014] In some embodiments, the at least two flexible members include a first flexible member and a second flexible member, the first flexible member is located between the second flexible member and the battery cell, and the thermal conductivity of the first flexible member is greater than the thermal conductivity of the second flexible member.

[0015] In the above technical solution, the thermal conductivity of the first flexible part is greater than the thermal conductivity of the second flexible part, and the first flexible part is located between the second flexible part and the battery cell. On the one hand, the heat exchange medium in the flow channel can exchange heat with the battery cell assembly through the first flexible part, thereby facilitating the heat exchange assembly to regulate the temperature of the battery cell assembly; on the other hand, the heat of the heat exchange medium and the battery cell assembly is not easily dissipated through the second flexible part, thereby reducing the heat loss of the battery device when the ambient temperature is low, reducing the risk of low battery cell temperature caused by low ambient temperature, and thus improving the reliability of the battery device.

[0016] In some embodiments, the flexible member includes a metal layer and a non-metal layer.

[0017] In the above technical solution, by setting the flexible part to a structure of metal layer and non-metal layer, the flexible part has better thermal conductivity, so as to effectively improve the temperature distribution of the battery cell assembly, thereby improving the cooling capacity of the heat exchange assembly on the battery cell assembly as a whole, which is beneficial to improving the reliability of the battery device.

[0018] In some embodiments, the metal layer is made of one or more of aluminum, copper, and steel.

[0019] In the above technical solution, by selecting one or more of aluminum, copper and steel to make the metal layer, the flexible part has better thermal conductivity, so as to effectively improve the temperature distribution of the battery cell assembly, thereby improving the cooling capacity of the heat exchange assembly on the battery cell assembly as a whole, which is beneficial to improving the reliability of the battery device.

[0020] In some embodiments, the non-metallic layer is a hot melt material.

[0021] In the above technical solution, the non-metallic layer is a hot-melt material, which can facilitate melting the non-metallic layer between at least two flexible parts through a hot pressing process to form a hot pressing area, thereby forming a flow channel through the hot pressing area, thereby facilitating the processing of the heat exchange component.

[0022] In some embodiments, the non-metallic layer is made of one or more of polypropylene, polyvinyl chloride, and polyethylene.

[0023] In the above technical solution, by using one or more of polypropylene, polyvinyl chloride and polyethylene to make a non-metallic layer, it is possible to melt the non-metallic layer between at least two flexible parts through a hot pressing process to form a hot pressing area, thereby forming a flow channel through the hot pressing area, thereby facilitating the processing of the heat exchange component.

[0024] In some embodiments, the flexible member is a metal plastic film.

[0025] In the above technical solution, the flexible part is a metal plastic film, which makes the flexible part easy to deform, so that the heat exchange component can be designed according to the shape of the first wall and the manifold, so that the heat exchange component can be attached to the manifold and the first wall, so that the heat exchange component in the battery device of this structure can adjust the temperature of the manifold and the first wall, and adjust the temperature of the electrode terminals of the battery cell through the manifold, thereby reducing the risk of excessive temperature of the manifold and the electrode terminals due to charging and discharging during the operation and charging process of the battery cell, thereby improving the reliability of the battery device.

[0026] In some embodiments, the flexible member is an aluminum-plastic film.

[0027] In the above technical solution, the flexible member is an aluminum-plastic film, which makes the flexible member have better corrosion resistance, reduces the risk of heat exchange medium leakage caused by corrosion of the flexible member by the heat exchange medium, and thus improves the reliability of the battery device.

[0028] In some embodiments, the thickness H of the flexible member satisfies 0.05 mm ≤ H ≤ 0.3 mm.

[0029] In the above technical solution, the thickness of the flexible part is reasonable. When the thickness of the flexible part is greater than or equal to 0.05 mm, the flow channel formed between the flexible parts can stably accommodate the heat exchange medium. When the thickness of the flexible part is less than or equal to 0.3 mm, it can reduce the impact of the heat exchange component on the volume of the battery device, reduce the space occupied by the battery device, and help improve the energy density of the battery device; therefore, when the above-mentioned flexible part is used in the heat exchange component, it can not only enable the heat exchange component to stably accommodate the heat exchange medium, but also reduce the impact of the heat exchange component on the volume of the battery device, reduce the space occupied by the battery device, and help improve the energy density of the battery device.

[0030] In some embodiments, the thickness H of the flexible member satisfies 0.08 mm ≤ H ≤ 0.2 mm.

[0031] In the above technical solution, the thickness of the flexible part is reasonable. When the thickness of the flexible part is greater than or equal to 0.08 mm, the flow channel formed between the flexible parts can more stably accommodate the heat exchange medium. When the thickness of the flexible part is less than or equal to 0.2 mm, it can further reduce the impact of the heat exchange component on the volume of the battery device, reduce the space occupied by the battery device, and help improve the energy density of the battery device; therefore, when the above-mentioned flexible part is used in the heat exchange component, it can not only enable the heat exchange component to more stably accommodate the heat exchange medium, but also further reduce the impact of the heat exchange component on the volume of the battery device, reduce the space occupied by the battery device, and help improve the energy density of the battery device.

[0032] In some embodiments, the flexible member is a layered structure, and the flexible member includes a corrosion-resistant layer, an isolation layer, and a waterproof layer arranged in sequence. The waterproof layer is closer to the flow channel area than the corrosion-resistant layer.

[0033] In the above technical solution, by setting the flexible part to include a corrosion-resistant layer, an isolation layer and a waterproof layer arranged in sequence, the waterproof layer is closer to the flow channel area than the corrosion-resistant layer. On the one hand, the area of the flexible part close to the flow channel has better waterproofness, and the risk of heat exchange medium leakage caused by the heat exchange medium directly passing through the corrosion-resistant layer is reduced; on the other hand, the corrosion resistance of the flexible part is improved, and the risk of heat exchange medium leakage caused by corrosion of the flexible part is reduced, which is beneficial to improving the reliability of the heat exchange component.

[0034] In some embodiments, the thickness H1 of the isolation layer satisfies 6.5 μm≤H1≤100 μm.

[0035] In the above technical solution, the thickness of the isolation layer is reasonable. When the thickness of the isolation layer is greater than or equal to 6.5μm, the isolation layer has good stamping and forming performance, so that it can maintain good structural stability after the flexible part becomes thinner after stamping, reduce the risk of stamping and splitting of the flexible part, and maintain the flexibility of the flexible part. When the thickness of the isolation layer is less than or equal to 100μm, it can reduce the impact of the heat exchange component on the volume of the battery device, reduce the space occupied by the battery device, and help improve the energy density of the battery device; therefore, when the above-mentioned isolation layer is used in the flexible part, the isolation layer can have good stamping and forming performance, so that it can maintain good structural stability after the flexible part becomes thinner after stamping, reduce the risk of stamping and splitting of the flexible part, and maintain the flexibility of the flexible part, while reducing the impact of the heat exchange component on the volume of the battery device, reducing the space occupied by the battery device, and help improve the energy density of the battery device.

[0036] In some embodiments, the thickness H1 of the isolation layer satisfies 15 μm≤H1≤100 μm.

[0037] In the above technical solution, the thickness of the isolation layer is reasonable. When the thickness of the isolation layer is greater than or equal to 1.5μm, the isolation layer has further stamping and forming performance, so that it can maintain good structural stability after the flexible part becomes thinner after stamping, reduce the risk of stamping and splitting of the flexible part, and further maintain the flexibility of the flexible part. When the thickness of the isolation layer is less than or equal to 100μm, it can reduce the impact of the heat exchange component on the volume of the battery device, reduce the space occupied by the battery device, and help improve the energy density of the battery device; therefore, when the above-mentioned isolation layer is used in the flexible part, it can not only make the isolation layer have better stamping and forming performance, so that it can maintain good structural stability after the flexible part becomes thinner after stamping, further reduce the risk of stamping and splitting of the flexible part, but also further maintain the flexibility of the flexible part, and at the same time reduce the impact of the heat exchange component on the volume of the battery device, reduce the space occupied by the battery device, and help improve the energy density of the battery device.

[0038] In some embodiments, the heat exchange component has a hot pressing area, which is configured to form at least two flexible parts by hot pressing. The hot pressing area separates the interior of the heat exchange component to form at least one flow channel.

[0039] In the above technical solution, a hot pressing process is performed between at least two flexible parts to form a hot pressing area, thereby forming a flow channel through the hot pressing area, thereby facilitating the processing of the heat exchange component.

[0040] In some embodiments, the width B of the hot pressing area satisfies 0.5 mm ≤ B ≤ 5 mm.

[0041] In the above technical solution, the width of the hot pressing area is reasonable. When the width of the hot pressing area is greater than or equal to 0.5 mm, the flow channel formed by the hot pressing area dividing the interior of the heat exchange component can stably accommodate the heat exchange medium. When the width of the hot pressing area is less than or equal to 5 mm, the area inside the heat exchange component occupied by the hot pressing area can be reduced, the heat exchange component's capacity for heat exchange medium is increased, and the heat exchange component's ability to regulate temperature is improved. Therefore, when the width of the above-mentioned hot pressing area is applied to the heat exchange component, it can not only enable the heat exchange component to stably accommodate the heat exchange medium, but also increase the heat exchange component's capacity for heat exchange medium, improve the heat exchange component's ability to regulate temperature, and help improve the reliability of the battery device.

[0042] In some embodiments, the width B of the hot pressing area satisfies 2 mm ≤ B ≤ 3 mm.

[0043] In the above technical solution, the width of the hot pressing area is reasonable. When the width of the hot pressing area is greater than or equal to 2 mm, the flow channel formed by the hot pressing area dividing the interior of the heat exchange component can more stably accommodate the heat exchange medium. When the width of the hot pressing area is less than or equal to 3 mm, the area inside the heat exchange component occupied by the hot pressing area can be further reduced, thereby increasing the capacity of the heat exchange component for the heat exchange medium and improving the temperature regulation capability of the heat exchange component. Therefore, when the width of the above hot pressing area is applied to the heat exchange component, it can not only enable the heat exchange component to accommodate the heat exchange medium more stably, but also further increase the capacity of the heat exchange component for the heat exchange medium, improve the temperature regulation capability of the heat exchange component, and help improve the reliability of the battery device.

[0044] In some embodiments, the housing has a second wall, the second wall is provided with a pressure relief mechanism, and the second wall is adjacent to or opposite to the first wall.

[0045] In the above technical solution, a pressure relief mechanism is provided on the second wall, and the second wall is adjacent to or opposite to the first wall, thereby reducing the risk of the exhaust discharged by the pressure relief mechanism directly contacting the heat exchange component and causing leakage of the heat exchange medium in the heat exchange component, thereby improving the reliability of the battery device.

[0046] In a second aspect, an embodiment of the present application further provides a battery device including the above, which is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0048] Figure 1 A schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0049] Figure 2 An exploded view of the structure of a battery device provided in some embodiments of the present application;

[0050] Figure 3 An exploded view of the structure of a battery cell assembly and a heat exchange assembly provided in some embodiments of the present application;

[0051] Figure 4 A cross-sectional view of a first heat exchange assembly provided in some embodiments of the present application when accommodating a heat exchange medium;

[0052] Figure 5 A cross-sectional view of a first heat exchange assembly provided in some embodiments of the present application when not accommodating a heat exchange medium;

[0053] Figure 6 An exploded view of the structure of a battery cell assembly and a second heat exchange assembly provided in some embodiments of the present application;

[0054] Figure 7 A schematic structural diagram of a second heat exchange assembly provided in some embodiments of the present application;

[0055] Figure 8 An exploded view of the structure of a battery cell assembly, a heat conducting member, and a second heat exchange assembly provided in some embodiments of the present application;

[0056] Figure 9 An exploded view of the structure of a battery cell assembly, a heat conducting member, and a heat exchange assembly provided in some embodiments of the present application;

[0057] Figure 10 A cross-sectional view of a third heat exchange assembly provided in some embodiments of the present application;

[0058] Figure 11 A cross-sectional view of a fourth heat exchange assembly provided in some embodiments of the present application;

[0059] Figure 12 A cross-sectional view of a fifth heat exchange assembly provided in some embodiments of the present application;

[0060] Figure 13A schematic structural diagram of a heat exchange assembly provided in some embodiments of the present application from another perspective;

[0061] Figure 14 A schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0062] Figure 15 A schematic structural diagram of another battery cell provided in some embodiments of the present application.

[0063] Icons: 1000-vehicle; 100-battery device; 10-box assembly; 11-first box body; 12-second box body; 20-battery cell assembly; 21-battery cell; 211-housing; 211A-first wall; 212-electrode terminal; 211B-second wall; 213-pressure relief mechanism; 22-merging piece; 30-heat exchange assembly; 30A-flexible part; 30B-flow channel; 30C-first area; 30D-second area; 30E-first groove; 30F-first surface; 30G-hot pressing area; 31-first flexible part; 32-second flexible part; 301-metal layer; 302-non-metal layer; 303-waterproof layer; 304-isolation layer; 305-corrosion-resistant layer; 200-controller; 300-motor. DETAILED DESCRIPTION

[0064] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts 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 meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0066] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0067] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0068] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0069] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0070] The term "plurality" used in this application refers to two or more (including two).

[0071] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is 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-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0073] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process, active ions (such as lithium ions) move back and forth between the positive and negative electrodes. A separator, placed between the positive and negative electrodes, reduces the risk of short circuits while allowing active ions to pass through.

[0074] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include battery cells connected in series, parallel, or hybrid via a busbar.

[0075] In some embodiments, a battery cell assembly is typically formed by arranging battery cell assemblies. For example, a battery cell assembly may be a battery module, which is formed by arranging and securing battery cell assemblies to form a single module. For example, a battery module may be formed by bundling battery cell assemblies with cable ties.

[0076] In some embodiments, the battery device may be a battery pack, which includes a case assembly and one or more battery cell assemblies, wherein the battery cell assembly is housed in the case assembly.

[0077] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box assembly by fixing the battery module in the box assembly.

[0078] As an example, the battery cell assembly may also be housed in the case assembly by directly fixing the battery cell assembly to the case assembly.

[0079] As an example, a box assembly may include a first box body and a second box body. The first and second box bodies engage to form an enclosed space within the box assembly to house the battery cell assembly. Enclosed here means covered or closed, and can be either sealed or unsealed. The first box body may be a top cover or a bottom plate.

[0080] As an example, the box assembly may include a top cover, a frame, and a bottom plate, wherein the top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box assembly to accommodate the battery cell assembly.

[0081] In some embodiments, the electric device may be a vehicle.

[0082] As an example, the box assembly can be used as part of the chassis structure of the vehicle. For example, the top cover of the box assembly can become at least a part of the floor of the vehicle, or the frame of the box assembly can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0083] In some embodiments, the battery device refers to an energy storage device, which includes a box assembly with a door on at least one side. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0084] In recent years, electric vehicles have experienced rapid development. In this field, batteries, as the power source of electric vehicles, play an irreplaceable and important role. As a core component of electric vehicles, batteries have high requirements for energy density.

[0085] In order to improve the working reliability and stability of the battery device in the battery device assembly scheme, a heat exchange assembly is usually set in the box assembly. The heat exchange assembly is used to accommodate the heat exchange medium to adjust the temperature of the battery cell assembly. In the related art, the heat exchange assembly can be set at the bottom of the battery cell assembly, or it can be installed between the large surfaces of adjacent battery cells in the battery cell assembly, or it can be set on the side of the battery cell assembly, so that the temperature of the battery cell assembly can be adjusted. The battery cell has a busbar welded on one side of the electrode terminal, so as to electrically connect the battery cells in the battery cell assembly, thereby facilitating the extraction of current from the battery cell assembly or the introduction of current into the battery cell assembly. However, when the battery cell assembly is charging and discharging, the temperature at the busbar and the electrode terminal will increase to a certain extent. The setting of the heat exchange assembly as mentioned above makes it difficult to adjust the temperature at the busbar and the electrode terminal, which leads to the problem of higher temperature of the busbar and the electrode terminal.

[0086] Based on the above considerations, in order to solve the problem of high temperature of the busbar and the electrode terminals of the battery cell in the battery cell assembly during charging and discharging. An embodiment of the present application provides a battery device, including a box assembly, a battery cell assembly and a heat exchange assembly. The box assembly has a accommodating cavity inside. The battery cell assembly is accommodated in the accommodating cavity, and the battery cell assembly includes a battery cell and a busbar. The battery cell includes an outer shell and an electrode terminal, the outer shell has a first wall, the electrode terminal is arranged on the first wall, and the busbar is connected to the electrode terminal to realize electrical connection of the battery cell assembly. The heat exchange assembly is arranged in the accommodating cavity, and the heat exchange assembly is attached to the busbar. Among them, the heat exchange assembly includes at least two flexible parts, at least two flexible parts are stacked, and at least one flow channel is formed between the flexible parts, and the flow channel is used to accommodate a heat exchange medium.

[0087] In a battery device of this structure, on the one hand, the busbar is connected to the electrode terminal, and the heat exchange assembly is attached to the busbar, so that the heat exchange assembly in the battery device of this structure can regulate the temperature of the busbar and regulate the temperature of the electrode terminal of the battery cell through the busbar, thereby reducing the risk of excessive temperature of the busbar and electrode terminal caused by charging and discharging of the battery cell during operation and charging, so as to improve the reliability of the battery device; on the other hand, the heat exchange assembly includes at least two flexible parts, at least two flexible parts are stacked, and at least one flow channel is formed between the flexible parts, and the flow channel is used to accommodate heat exchange medium, so that the heat exchange assembly of this structure can be better attached to the busbar, and thus better regulate the temperature of the busbar. At the same time, when the battery device is not in use, it is also convenient to extract the heat exchange medium in the flow channel from the heat exchange assembly, so as to reduce the risk of heat exchange medium leakage when the battery device is not in use, so as to improve the reliability of the battery device.

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

[0089] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device according to an embodiment of the present application.

[0090] Please refer to Figure 1 , Figure 1 A schematic structural diagram of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000. The battery device 100 may be provided at the bottom of the vehicle 1000, or at the head of the vehicle 1000, or at the tail of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000. For example, the battery device 100 may serve as an operating power source or a power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to power the motor 300, for example, to meet the power requirements for starting, navigating and driving the vehicle 1000.

[0091] In some embodiments of the present application, the battery device 100 can not only serve as the operating power source or usage power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0092] According to some embodiments of the present application, referring to Figure 2 and Figure 3 , and please refer to Figure 4 and Figure 5 , Figure 2 This is an exploded view of the structure of the battery device 100 provided in some embodiments of the present application. Figure 3 This is an exploded view of the structure of the battery cell assembly 20 and the heat exchange assembly 30 provided in some embodiments of the present application. Figure 4 Figure 5Cross-sectional views of the first heat exchange assembly 30 provided in some embodiments of the present application in two states: accommodating a heat exchange medium and not accommodating a heat exchange medium. An embodiment of the present application provides a battery device 100, comprising a box assembly 10, a battery cell assembly 20, and a heat exchange assembly 30. The box assembly 10 has an accommodating cavity inside. The battery cell assembly 20 is accommodated in the accommodating cavity, and the battery cell assembly 20 includes a battery cell 21 and a busbar 22. The battery cell 21 includes an outer shell 211 and an electrode terminal 212. The outer shell 211 has a first wall 211A, and the electrode terminal 212 is arranged on the first wall 211A. The busbar 22 is connected to the electrode terminal 212 to achieve electrical connection of the battery cell 21. The heat exchange assembly 30 is arranged in the accommodating cavity, and the heat exchange assembly 30 is attached to the busbar 22. The heat exchange assembly 30 includes at least two flexible members 30A, which are stacked and at least one flow channel 30B is formed between the flexible members 30A. The flow channel 30B is used to accommodate a heat exchange medium.

[0093] The box assembly 10 is used to provide an assembly space for the battery cell assembly 20. The box assembly 10 can adopt various structures. In some embodiments, the box assembly 10 can include a first box body 11 and a second box body 12. The first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cell assembly 20. The second box body 12 can be a hollow structure with one end open. The first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define the assembly space. The first box body 11 and the second box body 12 can also be hollow structures with one end open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0094] Of course, the box assembly 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder, a cuboid or a cube. Figure 2 In the embodiment, the box assembly 10 is in the shape of a cuboid.

[0095] It can be understood that the box assembly 10 can also be used to accommodate a limiting structure for limiting the movement of the battery cell assembly 20 and the heat exchange assembly 30.

[0096] The battery cell assembly 20 is composed of multiple battery cells 21. Multiple battery cells 21 can be connected in series, in parallel, or in a hybrid configuration to form the battery cell assembly 20. A hybrid configuration refers to a combination of series and parallel connections within the battery cell 21. Multiple battery cells 21 can be directly connected in series, in parallel, or in a hybrid configuration, and then the battery cell assembly 20 consisting of the multiple battery cells 21 is housed within a housing. Alternatively, the battery device 100 can be constructed by first connecting multiple battery cells 21 in series, in parallel, or in a hybrid configuration to form the battery cell assembly 20, which is then further connected in series, in parallel, or in a hybrid configuration to form a single unit, which is then housed within the housing.

[0097] The battery cell assembly 20 may further include other structures. For example, the battery cell assembly 20 may further include a busbar 22 , which is used to connect the multiple battery cells 21 to achieve electrical connection between the multiple battery cells 21 .

[0098] The busbar 22 is a component that connects multiple battery cells 21 in series or in parallel to achieve electrical connection between the multiple battery cells 21. The busbar 22, also known as a busbar, a sheet, or a busbar, is typically a thin metal sheet that can be welded to the electrode terminals 212 of the battery cells 21 to connect the multiple battery cells 21 in series or in parallel.

[0099] The heat exchange assembly 30 is used to regulate the temperature of the battery cells 21. It can contain a heat exchange medium to regulate the temperature of multiple battery cells 21. Specifically, the heat exchange medium can be a liquid, a gas, or a solid-liquid phase change material. Solid-liquid phase change materials are initially solid and transform into liquids after absorbing heat.

[0100] Adjusting the temperature refers to heating or cooling the multiple battery cells 21. In the case of cooling or lowering the temperature of the battery cells 21, the heat exchange component 30 is used to accommodate a cooling heat exchange medium to lower the temperature of the multiple battery cells 21. At this time, the heat exchange component 30 can also be called a cooling component, a cooling system or a cooling plate, etc., and the heat exchange medium it accommodates can also be called a cooling medium or a cooling heat exchange medium, more specifically, it can be called a coolant or a cooling gas. In addition, the heat exchange component 30 can also be used for heating to increase the temperature of the multiple battery cells 21, and the embodiments of the present application are not limited to this. Optionally, the heat exchange medium can be circulating to achieve a better temperature regulation effect. Optionally, the heat exchange medium can be water, a mixture of water and ethylene glycol, or air, etc.

[0101] The flexible member 30A is a member made of a flexible material. It is understood that the surface of the heat exchange assembly 30 composed of the flexible member 30A facing the manifold 22 can follow the shape of the manifold 22 to be concave and convex, thereby better attached to the manifold 22.

[0102] In some embodiments, reference Figure 4and Figure 5 The heat exchange component 30 can be formed by stacking two plate-shaped flexible parts 30A. The surfaces of the flexible parts 30A facing each other can be recessed to form a groove. The stacking of the two flexible parts 30A allows the groove to form a flow channel 30B that allows the heat exchange flow channel 30B.

[0103] Flow channel 30B refers to a portion that can accommodate heat exchange medium and allow it to flow. In some embodiments, the heat exchange assembly 30 is connected to an electrical device via a connector. A heat exchange medium storage device (e.g., a water tank) in the electrical device provides heat exchange medium to the heat exchange assembly 30, allowing the heat exchange medium to circulate between the heat exchange assembly 30 and the medium storage device. For example, when heating the battery cell assembly 20 is required, the medium in the heat exchange medium storage device flows out and is heated. The heated medium can then flow into the heat exchange assembly 30 to heat the battery cell assembly 20 in the housing assembly 10, and then flow back to the heat exchange medium storage device.

[0104] Specifically, refer to Figure 4 The heat exchange medium storage device in the electrical device provides positive pressure to the heat exchange assembly 30, so that when the heat exchange medium enters the flow channel 30B, the groove portion of the flexible member 30A can be expanded as much as possible to accommodate more heat exchange medium, thereby improving the heat exchange capacity of the heat exchange device, and further improving the temperature regulation ability of the heat exchange device on the battery cell assembly 20; refer to Figure 5 The heat exchange medium storage device in the electrical device provides negative pressure to the heat exchange component 30, so that when the heat exchange medium flows out of the flow channel 30B, the groove portion in the flexible member 30A can be compressed as much as possible to allow the heat exchange medium to leave the flow channel 30B, thereby reducing the volume of the heat exchange medium remaining in the flow channel 30B, thereby reducing the risk of heat exchange medium leakage when the battery device 100 is not in use, and improving the reliability of the battery device 100.

[0105] In some embodiments, the flow channel 30B inside the heat exchange assembly 30 can be arranged in a circuitous manner so that the contact area between the medium and the battery cell assembly 20 is larger.

[0106] In this embodiment, on the one hand, the busbar 22 is connected to the electrode terminal 212, and the heat exchange component 30 is attached to the busbar 22, so that the heat exchange component 30 in the battery device 100 of this structure can adjust the temperature of the busbar 22, and adjust the temperature of the electrode terminal 212 of the battery cell 21 through the busbar 22, thereby reducing the risk of excessive temperature of the busbar 22 and the electrode terminal 212 caused by charging and discharging of the battery cell 21 during operation and charging, thereby improving the reliability of the battery device 100; on the other hand, the heat exchange component 30 includes at least two flexible The flexible member 30A is stacked with at least two flexible members 30A, and at least one flow channel 30B is formed between the flexible members 30A. The flow channel 30B is used to accommodate the heat exchange medium, so that the heat exchange component 30 of this structure can be better attached to the bus 22, thereby better regulating the temperature of the bus 22. At the same time, when the battery device 100 is not in use, it is also convenient to extract the heat exchange medium in the flow channel 30B from the heat exchange component 30, so as to reduce the risk of heat exchange medium leakage when the battery device 100 is not in use, thereby improving the reliability of the battery device 100.

[0107] According to some embodiments of the present application, referring to Figure 6 and Figure 7 , Figure 6 This is an exploded view of the structure of the battery cell assembly 20 and the second heat exchange assembly 30 provided in some embodiments of the present application. Figure 7 This is a schematic structural diagram of a second heat exchange assembly 30 provided in some embodiments of the present application. The heat exchange assembly 30 includes a first region 30C and a second region 30D. The first region 30C is attached to the manifold 22, and the second region 30D is attached to the first wall 211A.

[0108] The first area 30C is the portion of the surface of the heat exchange assembly 30 facing the battery cell assembly 20 that is used to be attached to the manifold 22 to adjust the temperature of the manifold 22; the second area 30D is the portion of the surface of the heat exchange assembly 30 facing the battery cell assembly 20 that is used to be attached to the first wall 211A of the battery cell 21 to adjust the temperature of the battery cell 21.

[0109] In some embodiments, the heat exchange assembly 30 has a first surface 30F facing the battery cell assembly 20, the first surface 30F is recessed to form a first groove 30E, the manifold 22 is accommodated in the first groove 30E, the bottom wall of the first groove 30E is configured as a first area 30C, and the portion of the first surface 30F other than the first groove 30E is configured as a second area 30D.

[0110] In some embodiments, the first groove 30E is formed on the first surface 30F by bending the heat exchange component 30 .

[0111] In other embodiments, external force is applied to the heat exchange component 30 so that a portion of the first surface 30F is in contact with the manifold 22, and external force is continued to be applied to the heat exchange component 30 so that the portion of the first surface 30F is driven by the manifold 22 and is recessed relative to the other first surfaces 30F that are not in contact with the manifold 22, so that a first groove 30E is formed on the first surface 30F.

[0112] It can be understood that by bending the flexible member 30A to form the first groove 30E, or by extruding the flexible member 30A to form the first groove 30E on the surface of the flexible member 30A, the first region 30C and the second region 30D are formed on the heat exchange assembly 30 .

[0113] In this embodiment, the second region 30D is attached to the first wall 211A so that the heat exchange assembly 30 can regulate the temperature of the manifold 22 , thereby reducing the risk of the battery cells 21 being overheated or underheated, thereby improving the reliability of the battery device 100 .

[0114] According to some embodiments of the present application, referring to Figure 8 and Figure 9 , Figure 8 This is an exploded view of the structure of the battery cell assembly 20, the heat conducting member and the second heat exchange assembly 30 provided in some embodiments of the present application. Figure 9 An exploded view of the battery cell assembly 20, heat conductor, and heat exchange assembly 30 provided in some embodiments of the present application. The battery device 100 also includes a heat conductor. A portion of the heat conductor is disposed between the first region 30C and the current bus 22, while another portion is disposed between the second region 30D and the first wall 211A.

[0115] The heat conducting member is a component provided between the battery cell assembly 20 and the heat exchange assembly 30. For example, the heat conducting member may be made of an insulating material having a thermal conductivity greater than or equal to 0.38 W / (m·K).

[0116] In some embodiments, reference Figure 8 The heat conducting member is arranged between the battery cell assembly 20 and the heat exchange assembly 30. Part of the heat conducting member is arranged in the first groove 30E, located between the groove wall of the first groove 30E and the bus bar 22, and connected to both the groove wall of the first groove 30E and the bus bar 22. Another part of the heat conducting member is arranged on the first surface 30F and located between the first wall 211A and the first surface 30F, and connected to both the first wall 211A and the first surface 30F.

[0117] In other embodiments, referring to Figure 9The heat conductive member is arranged between the battery cell assembly 20 and the heat exchange assembly 30, part of the heat conductive member is located between the heat exchange assembly 30 and the manifold 22, and is connected to both the heat exchange assembly 30 and the manifold 22, and part of the heat conductive member is located between the heat exchange assembly 30 and the first wall 211A.

[0118] In some other embodiments, the heat conductor is arranged between the battery cell assembly 20 and the heat exchange assembly 30, part of the heat conductor is located between the heat exchange assembly 30 and the manifold 22, and is connected to both the heat exchange assembly 30 and the manifold 22, and part of the heat conductor is located between the heat exchange assembly 30 and the first wall 211A, and is connected to both the heat exchange assembly 30 and the first wall 211A.

[0119] In this embodiment, a portion of the heat conductor is arranged between the first area 30C and the bus bar 22, and another portion of the heat conductor is arranged between the second area 30D and the first wall 211A. Therefore, through the uniform heat effect of the heat conductor, the temperature difference between the first wall 211A of the battery cell 21 and the bus bar 22 is reduced, thereby improving the cooling capacity of the heat exchange assembly 30 on the battery cell assembly 20 as a whole, which is beneficial to improving the reliability of the battery device 100.

[0120] According to some embodiments of the present application, the heat conducting member is a heat conducting adhesive.

[0121] For example, the thermal conductive adhesive may be thermal conductive silicone rubber, which is mainly composed of organic silicone rubber with fillers, thermal conductive materials and other polymer materials added and mixed, and has good thermal conductivity and electrical insulation properties.

[0122] In this embodiment, the heat conductive member is a thermally conductive adhesive. On the one hand, the heat conductive member can be used to fix the heat exchange assembly 30 and the battery cell assembly 20; on the other hand, it can facilitate heat transfer so that the heat exchange assembly 30 can adjust the temperature of the battery cell assembly 20.

[0123] According to some embodiments of the present application, referring to Figure 10 , Figure 10 A cross-sectional view of a third heat exchange assembly 30 provided in some embodiments of the present application. The at least two flexible members 30A include a first flexible member 31 and a second flexible member 32. The first flexible member 31 is positioned between the second flexible member 32 and a battery cell (not shown). The thermal conductivity of the first flexible member 31 is greater than that of the second flexible member 32.

[0124] For example, the first flexible member 31 may be a copper foil, and the second flexible member 32 may be an aluminum foil.

[0125] Specifically, when the battery device 100 needs to be cooled by the heat exchange component 30, copper platinum can exchange heat with the battery cell assembly 20 more quickly; when the battery device 100 is working at a relatively cold ambient temperature, the heat exchange medium can be replaced with air, and the thermal conductivity of the aluminum foil and air is lower than that of the copper foil, thereby slowing down the rate of heat loss through the heat exchange component 30, thereby reducing the heat loss of the battery device 100.

[0126] In this embodiment, the thermal conductivity of the first flexible part 31 is greater than the thermal conductivity of the second flexible part 32, and the first flexible part 31 is located between the second flexible part 32 and the battery cell 21. On the one hand, the heat exchange medium in the flow channel 30B can exchange heat with the battery cell assembly 20 through the first flexible part 31, thereby facilitating the heat exchange assembly 30 to regulate the temperature of the battery cell assembly 20; on the other hand, the heat of the heat exchange medium and the battery cell assembly 20 is not easily dissipated through the second flexible part 32, thereby reducing the heat loss of the battery device 100 when the ambient temperature is low, reducing the risk of the battery cell 21 temperature being too low due to the low ambient temperature, and thus improving the reliability of the battery device 100.

[0127] According to some embodiments of the present application, referring to Figure 11 , Figure 11 This is a cross-sectional view of a fourth heat exchange assembly 30 provided in some embodiments of the present application. The flexible member 30A includes a metal layer 301 and a non-metal layer 302 .

[0128] In some embodiments, reference Figure 11 The heat exchange assembly 30 includes two flexible members 30A. The non-metallic layers 302 of the two flexible members 30A are located between the metal layers 301 of the two flexible members 30A. The facing surfaces of the non-metallic layers 302 of the two flexible members 30A partially enclose a flow channel 30B. On the one hand, the metal layer 301 is located outside the non-metallic layer 302, which reduces the risk of other parts of the battery device 100 piercing the flexible members 30A and causing leakage of the heat exchange medium, thereby improving the reliability of the battery device 100. On the other hand, the non-metallic layer 302 is located between the heat exchange medium and the metal layer 301, thereby reducing the risk of the heat exchange medium corroding the metal layer 301 and causing leakage of the heat exchange medium, thereby improving the reliability of the battery device 100.

[0129] In this embodiment, by setting the flexible part 30A to a structure of a metal layer 301 and a non-metallic layer 302, the flexible part 30A has better thermal conductivity, so as to effectively improve the temperature distribution of the battery cell assembly 20, thereby improving the overall cooling capacity of the heat exchange assembly 30 on the battery cell assembly 20, which is beneficial to improving the reliability of the battery device 100.

[0130] According to some embodiments of the present application, the metal layer 301 is made of one or more of aluminum, copper, and steel.

[0131] Aluminum, copper, and steel all have a certain strength, which can reduce the risk of other parts of the battery device 100 piercing the flexible member 30A, causing leakage of the heat exchange medium, thereby improving the reliability of the battery device 100. Aluminum, copper, and steel also have a certain degree of corrosion resistance, thereby reducing the risk of the heat exchange medium corroding the metal layer 301, thereby improving the reliability of the battery device 100. These metal materials also have the advantages of being abundant and easily available.

[0132] In this embodiment, by selecting one or more of aluminum, copper and steel to form the metal layer 301, the flexible component 30A has good thermal conductivity, so as to effectively improve the temperature distribution of the battery cell assembly 20, thereby improving the overall cooling capacity of the heat exchange assembly 30 on the battery cell assembly 20, thereby facilitating improved reliability of the battery device 100.

[0133] According to some embodiments of the present application, the non-metal layer 302 is a hot-melt material.

[0134] For example, the non-metallic layer 302 may be made of a hot-melt material such as polyethylene, polypropylene or polyamide.

[0135] Since the non-metallic layer 302 is made of hot-melt material, it will melt when heated to a predetermined temperature and has strong viscosity, thereby facilitating the connection of the non-metallic layers 302 of the two flexible parts 30A with each other through a hot pressing process.

[0136] In this embodiment, the non-metallic layer 302 is a hot-melt material, which can facilitate melting the non-metallic layer 302 between at least two flexible parts 30A through a hot pressing process to form a hot pressing area 30G, thereby forming a flow channel 30B through the hot pressing area 30G, thereby facilitating the processing of the heat exchange component 30.

[0137] According to some embodiments of the present application, the non-metallic layer 302 is made of one or more of polypropylene, polyvinyl chloride, and polyethylene.

[0138] Polypropylene, polyvinyl chloride and polyethylene have good corrosion resistance, thereby reducing the risk of heat exchange medium corroding the flexible part 30A and causing heat exchange medium leakage, thereby improving the reliability of the battery device 100, and the above materials are easy to be heated and melted, and after melting, they can be connected to each other by pressurization, thereby making it easy for the non-metallic layer 302 of the flexible part 30A made of the above materials to be connected with the non-metallic layer 302 of the adjacent flexible part 30A through a hot pressing process, thereby reducing the manufacturing difficulty of the heat exchange component 30, and the above non-metallic materials also have the advantages of abundant sources and easy acquisition.

[0139] In this embodiment, by using one or more of polypropylene, polyvinyl chloride and polyethylene to make the non-metallic layer 302, it is possible to facilitate melting the non-metallic layer 302 between at least two flexible parts 30A through a hot pressing process to form a hot pressing area 30G, thereby forming a flow channel 30B through the hot pressing area 30G, thereby facilitating the processing of the heat exchange component 30.

[0140] According to some embodiments of the present application, the flexible member 30A is a metal plastic film.

[0141] Metal plastic film is a composite material that combines plastic and metal films. It usually consists of a plastic substrate and a metal layer 301, which are firmly bonded together through processes such as heat pressing or evaporation.

[0142] In this embodiment, the flexible part 30A is a metal plastic film, which makes the flexible part 30A easy to deform, so that the heat exchange component 30 can be designed according to the shape of the first wall 211A and the bus 22, so that the heat exchange component 30 can be attached to the bus 22 and the first wall 211A, so that the heat exchange component 30 in the battery device 100 of this structure can adjust the temperature of the bus 22 and the first wall 211A, and adjust the temperature of the electrode terminal 212 of the battery cell 21 through the bus 22, thereby reducing the risk of excessive temperature of the bus 22 and the electrode terminal 212 caused by charging and discharging during the operation and charging process of the battery cell 21, thereby improving the reliability of the battery device 100.

[0143] According to some embodiments of the present application, the flexible member 30A is an aluminum-plastic film.

[0144] Aluminum-plastic film is an existing material with good electrolyte resistance.

[0145] The heat exchange assembly 30 has certain requirements on the corrosion resistance of the flexible part 30A, and the aluminum-plastic film can generally meet the corrosion resistance requirements of the heat exchange assembly 30 on the flexible part 30A.

[0146] In this embodiment, the flexible member 30A is an aluminum-plastic film, which makes the flexible member 30A have good corrosion resistance, reduces the risk of heat exchange medium leakage caused by corrosion of the flexible member 30A by the heat exchange medium, and thus improves the reliability of the battery device 100.

[0147] According to some embodiments of the present application, referring to Figure 4 and Figure 5 The thickness H of the flexible member 30A satisfies 0.05 mm ≤ H ≤ 0.3 mm.

[0148] H can be any point value among 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, or a range value between any two of them.

[0149] In this embodiment, the thickness of the flexible member 30A is reasonable. When the thickness of the flexible member 30A is greater than or equal to 0.05 mm, the flow channel 30B formed between the flexible members 30A can stably accommodate the heat exchange medium. When the thickness of the flexible member 30A is less than or equal to 0.3 mm, the influence of the heat exchange component 30 on the volume of the battery device 100 can be reduced, and the space occupied by the battery device 100 can be reduced, which is beneficial to improving the energy density of the battery device 100. Therefore, when the above-mentioned flexible member 30A is used in the heat exchange component 30, it can enable the heat exchange component 30 to stably accommodate the heat exchange medium, while reducing the influence of the heat exchange component 30 on the volume of the battery device 100, reducing the space occupied by the battery device 100, and helping to improve the energy density of the battery device 100.

[0150] According to some embodiments of the present application, referring to Figure 4 and Figure 5 The thickness H of the flexible member 30A satisfies 0.08 mm ≤ H ≤ 0.2 mm.

[0151] H can be any point value among 0.08mm, 0.09mm, 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, or a range value between any two of them.

[0152] In this embodiment, the thickness of the flexible member 30A is reasonable. When the thickness of the flexible member 30A is greater than or equal to 0.08 mm, the flow channel 30B formed between the flexible members 30A can more stably accommodate the heat exchange medium. When the thickness of the flexible member 30A is less than or equal to 0.2 mm, the influence of the heat exchange component 30 on the volume of the battery device 100 can be further reduced, and the space occupied by the battery device 100 is reduced, which is beneficial to improving the energy density of the battery device 100. Therefore, when the above-mentioned flexible member 30A is used in the heat exchange component 30, it can not only enable the heat exchange component 30 to more stably accommodate the heat exchange medium, but also further reduce the influence of the heat exchange component 30 on the volume of the battery device 100, reduce the space occupied by the battery device 100, and is beneficial to improving the energy density of the battery device 100.

[0153] According to some embodiments of the present application, referring to Figure 12 , Figure 12A cross-sectional view of a fifth heat exchange assembly 30 provided in some embodiments of the present application. The flexible member 30A is a layered structure comprising a corrosion-resistant layer 305, an isolation layer 304, and a waterproof layer 303, with the waterproof layer 303 being closer to the flow channel 30B than the corrosion-resistant layer 305.

[0154] Corrosion-resistant layer 305 is the portion of flexible member 30A located on the side of isolation layer 304 away from flow channel 30B. It is understood that corrosion-resistant layer 305 can be made of a corrosion-resistant material. For example, corrosion-resistant layer 305 can be made of nylon, which provides a certain degree of corrosion resistance, such as resistance to acid and alkali corrosion.

[0155] Isolation layer 304 is the portion of flexible member 30A that separates corrosion-resistant layer 305 from waterproof layer 303. It is understood that isolation layer 304 can be a metal layer, thereby providing structural strength to flexible member 30A and providing isolation. For example, the metal layer can be one or more of aluminum foil, copper foil, and steel foil.

[0156] The waterproof layer 303 is the portion of the flexible member 30A adjacent to the flow channel 30B. It is understood that the waterproof layer 303 can be a non-metallic layer and can be made of a waterproof material. For example, the non-metallic layer can be made of one or more of polypropylene, polyvinyl chloride, and polyethylene.

[0157] In this embodiment, by setting the flexible part 30A to include a corrosion-resistant layer 305, an isolation layer 304 and a waterproof layer 303 arranged in sequence, the waterproof layer 303 is closer to the flow channel 30B area than the corrosion-resistant layer 305. On the one hand, the area of the flexible part 30A close to the flow channel 30B has better waterproofness, and the risk of heat exchange medium leakage caused by the heat exchange medium directly passing through the corrosion-resistant layer 305 is reduced; on the other hand, the corrosion resistance of the flexible part 30A is improved, and the risk of heat exchange medium leakage caused by corrosion of the flexible part 30A is reduced, which is beneficial to improving the reliability of the heat exchange component 30.

[0158] According to some embodiments of the present application, referring to Figure 12 The thickness H1 of the isolation layer 304 satisfies 6.5 μm≤H1≤100 μm.

[0159] H1 can be any point value among 6.5μm, 8μm, 9μm, 10μm, 20μm, 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm, 100μm, or a range value between any two of them.

[0160] In this embodiment, the thickness of the isolation layer 304 is reasonable. When the thickness of the isolation layer 304 is greater than or equal to 6.5 μm, the isolation layer 304 has good stamping forming performance, so that after the flexible part 30A is thinned after stamping, it can still maintain good structural stability, reduce the risk of the flexible part 30A being stamped and split, and at the same time, maintain the flexibility of the flexible part 30A. When the thickness of the isolation layer 304 is less than or equal to 100 μm, it can reduce the impact of the heat exchange component 30 on the volume of the battery device 100, reduce the space occupied by the battery device 100, and is beneficial to the heat exchange component 30. In order to improve the energy density of the battery device 100; therefore, when the above-mentioned isolation layer 304 is used in the flexible part 30A, the isolation layer 304 can have better stamping forming performance, so that the flexible part 30A can maintain good structural stability after being thinned after stamping, reducing the risk of stamping and splitting of the flexible part 30A. At the same time, it can also maintain the flexibility of the flexible part 30A, and at the same time reduce the impact of the heat exchange component 30 on the volume of the battery device 100, reduce the space occupied by the battery device 100, and help to improve the energy density of the battery device 100.

[0161] According to some embodiments of the present application, referring to Figure 12 The thickness H1 of the isolation layer 304 satisfies 15 μm≤H1≤100 μm.

[0162] H1 can be any point value among 15μm, 16μm, 17μm, 18μm, 19μm, 20μm, 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm, 100μm, or a range value between any two of them.

[0163] In this embodiment, the thickness of the isolation layer 304 is reasonable. When the thickness of the isolation layer 304 is greater than or equal to 1.5 μm, the isolation layer 304 has further stamping forming performance, so that after the flexible part 30A is thinned after stamping, it can still maintain good structural stability, reduce the risk of stamping and splitting of the flexible part 30A, and further maintain the flexibility of the flexible part 30A. When the thickness of the isolation layer 304 is less than or equal to 100 μm, it can reduce the impact of the heat exchange component 30 on the volume of the battery device 100, reduce the space occupied by the battery device 100, and is beneficial to Improve the energy density of the battery device 100; therefore, when the above-mentioned isolation layer 304 is used in the flexible part 30A, the isolation layer 304 can have better stamping forming performance, so that the flexible part 30A can maintain good structural stability after being thinned after stamping, and further reduce the risk of stamping and splitting of the flexible part 30A. At the same time, it can further maintain the flexibility of the flexible part 30A, and at the same time reduce the impact of the heat exchange component 30 on the volume of the battery device 100, reduce the space occupied by the battery device 100, and help to improve the energy density of the battery device 100.

[0164] According to some embodiments of the present application, referring to Figure 13 , Figure 13 This is a schematic diagram of the structure of the heat exchange assembly 30 provided in some embodiments of the present application from another perspective. The heat exchange assembly 30 has a hot pressing region 30G, which is configured to form at least two flexible members 30A by hot pressing. The hot pressing region 30G separates the interior of the heat exchange assembly 30 to form at least one flow channel 30B.

[0165] The hot pressing area 30G is an area where a portion of the flexible part 30A is heated within a preset temperature range so that the flexible part 30A melts after being heated to a predetermined temperature, and the flexible part 30A has stronger adhesion, thereby facilitating the connection between the two flexible parts 30A with or without additional pressure.

[0166] In this embodiment, a hot pressing process is performed between at least two flexible members 30A to form a hot pressing region 30G, thereby forming a flow channel 30B through the hot pressing region 30G, thereby facilitating the processing of the heat exchange assembly 30 .

[0167] According to some embodiments of the present application, the width B of the hot pressing area 30G satisfies 0.5 mm ≤ B ≤ 5 mm.

[0168] The width B of the hot pressing region 30G may refer to the distance between adjacent and parallel flow channels 30B in any direction perpendicular to the thickness of the flexible member 30A.

[0169] B can be any point value among 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, or a range value between any two of them.

[0170] In this embodiment, the width of the hot pressing area 30G is reasonable. When the width of the hot pressing area 30G is greater than or equal to 0.5 mm, the flow channel 30B formed by the hot pressing area 30G separating the interior of the heat exchange component 30 can stably accommodate the heat exchange medium. When the width of the hot pressing area 30G is less than or equal to 5 mm, the area inside the heat exchange component 30 occupied by the hot pressing area 30G can be reduced, the capacity of the heat exchange component 30 to accommodate the heat exchange medium is increased, and the temperature regulation capability of the heat exchange component 30 is improved. Therefore, when the width of the above-mentioned hot pressing area 30G is applied to the heat exchange component 30, it can not only enable the heat exchange component 30 to stably accommodate the heat exchange medium, but also increase the capacity of the heat exchange component 30 to accommodate the heat exchange medium, improve the temperature regulation capability of the heat exchange component 30, and help improve the reliability of the battery device 100.

[0171] According to some embodiments of the present application, referring to Figure 13 , the width B of the hot pressing area 30G satisfies 2mm≤B≤3mm.

[0172] B can be any point value of 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, or a range value between any two of them.

[0173] In this embodiment, the width of the hot pressing area 30G is reasonable. When the width of the hot pressing area 30G is greater than or equal to 2 mm, the flow channel 30B formed by the hot pressing area 30G separating the interior of the heat exchange component 30 can more stably accommodate the heat exchange medium. When the width of the hot pressing area 30G is less than or equal to 3 mm, the area inside the heat exchange component 30 occupied by the hot pressing area 30G can be further reduced, thereby increasing the capacity of the heat exchange component 30 for the heat exchange medium and improving the temperature regulation capability of the heat exchange component 30. Therefore, when the width of the hot pressing area 30G is applied to the heat exchange component 30, it can not only enable the heat exchange component 30 to accommodate the heat exchange medium more stably, but also further increase the capacity of the heat exchange component 30 for the heat exchange medium, improve the temperature regulation capability of the heat exchange component 30, and thus help improve the reliability of the battery device 100.

[0174] According to some embodiments of the present application, referring to Figure 14 and Figure 15 , Figure 14 and Figure 15 Schematic diagram of the structure of two battery cells 21 provided in some embodiments of the present application. The housing 211 has a second wall 211B, on which a pressure relief mechanism 213 is provided. The second wall 211B is adjacent to or opposite to the first wall 211A.

[0175] The pressure relief mechanism 213 refers to an element or component that is actuated to release the internal pressure or temperature when the internal pressure or temperature or other conditions of the battery cell 21 reach a predetermined threshold. The threshold design varies according to different design requirements. The threshold may depend on one or more materials of the positive electrode plate, negative electrode plate, electrolyte and isolation membrane in the battery cell 21. The pressure relief mechanism 213 can take the form of an explosion-proof valve, an air valve, a pressure relief valve or a safety valve, and can specifically adopt a pressure-sensitive or temperature-sensitive element or structure, that is, when the internal pressure or temperature or other conditions of the battery cell 21 reach a predetermined threshold, the pressure relief mechanism 213 performs an action or the weak structure provided in the pressure relief mechanism 213 is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released.

[0176] The "actuation" mentioned in the embodiments of the present application refers to the action of the pressure relief mechanism 213 or its activation to a certain state, so that the internal pressure and temperature of the battery cell 21 can be released, so that the internal pressure and temperature of the battery cell 21 can be released. The action produced by the pressure relief mechanism 213 may include but is not limited to: at least a part of the pressure relief mechanism 213 is broken, shattered, melted, torn or opened, etc. When the pressure relief mechanism 213 is actuated, the high-temperature and high-pressure substances inside the battery cell 21 will be discharged outward from the actuated part as emissions. In this way, the pressure and temperature of the battery cell 21 can be relieved under controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0177] It is understandable that, referring to Figure 14 The pressure relief mechanism 213 is provided on the second wall 211B. When the second wall 211B is adjacent to the first wall 211A, when the pressure relief mechanism 213 is braked, the discharge enters the box assembly 10 in a direction parallel to the outer surface of the first wall 211A, thereby reducing the risk of the discharge from the battery cell 21 directly contacting the flexible member 30A of the heat exchange assembly 30 and causing the flexible member 30A to be melted through; Figure 15 The pressure relief mechanism 213 is arranged on the second wall 211B. When the second wall 211B is opposite to the first wall 211A, when the pressure relief mechanism 213 is braked, the discharge enters the box assembly 10 from the side of the battery cell 21 away from the outer surface of the first wall 211A, thereby reducing the risk of the discharge from the battery cell 21 directly contacting the flexible part 30A of the heat exchange assembly 30 and causing the flexible part 30A to be melted through.

[0178] In this embodiment, the second wall 211B is provided with a pressure relief mechanism 213, and the second wall 211B is adjacent to or opposite to the first wall 211A, thereby reducing the risk of the exhaust discharged by the pressure relief mechanism 213 directly contacting the heat exchange component 30 and causing leakage of the heat exchange medium in the heat exchange component 30, thereby improving the reliability of the battery device 100.

[0179] According to some embodiments of the present application, the present application further provides an electrical device, which includes the battery device 100 of any of the above solutions, and the battery device 100 is used to provide electrical energy to the electrical device.

[0180] The power-consuming device may be any of the aforementioned devices or systems using the battery device 100 .

[0181] According to some embodiments of the present application, referring to Figures 2 to 15 The present application provides a battery device 100 , including a box assembly 10 , a battery cell assembly 20 , and a heat exchange assembly 30 .

[0182] The housing assembly 10 has a storage cavity inside. The battery cell assembly 20 is accommodated in the storage cavity. The battery cell assembly 20 includes a battery cell 21 and a busbar 22. The battery cell 21 includes a shell 211 and an electrode terminal 212. The shell 211 has a first wall 211A. The electrode terminal 212 is arranged on the first wall 211A. The busbar 22 is connected to the electrode terminal 212 to achieve electrical connection of the battery cell assembly 20. The heat exchange assembly 30 is arranged in the storage cavity. The heat exchange assembly 30 is attached to the busbar 22. Among them, the heat exchange assembly 30 includes at least two flexible parts 30A. The at least two flexible parts 30A are stacked and at least one flow channel 30B is formed between the flexible parts 30A. The flow channel 30B is used to accommodate the heat exchange medium.

[0183] The heat exchange assembly 30 includes a first region 30C and a second region 30D. The first region 30C is attached to the manifold 22 , and the second region 30D is attached to the first wall 211A.

[0184] The battery device 100 further includes a heat conductor, a portion of which is disposed between the first region 30C and the current bus 22 , and another portion of which is disposed between the second region 30D and the first wall 211A.

[0185] The at least two flexible members 30A include a first flexible member 31 and a second flexible member 32 . The first flexible member 31 is located between the second flexible member 32 and the battery cell 21 . The thermal conductivity of the first flexible member 31 is greater than that of the second flexible member 32 .

[0186] In some embodiments, the flexible member 30A includes a metal layer 301 and a non-metal layer 302 , wherein the metal layer 301 is made of one or more of aluminum, copper, and steel; and the non-metal layer 302 is made of one or more of polypropylene, polyvinyl chloride, and polyethylene.

[0187] In some embodiments, the flexible member 30A is an aluminum-plastic film.

[0188] The thickness H of the flexible member 30A satisfies 0.08 mm ≤ H ≤ 0.2 mm.

[0189] The heat exchange component 30 has a hot pressing area 30G, which is constructed to form at least two flexible parts 30A by hot pressing. The hot pressing area 30G separates the interior of the heat exchange component 30 to form at least one flow channel 30B. The width B of the hot pressing area 30G satisfies 2mm≤B≤3mm.

[0190] The housing 211 has a second wall 211B. The second wall 211B is provided with a pressure relief mechanism 213 . The second wall 211B is adjacent to or opposite to the first wall 211A.

[0191] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0192] The above embodiments are intended only to illustrate the technical solutions of this application and are not intended to limit this application. Those skilled in the art will appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this application are intended to be within the scope of protection of this application.

Claims

1. A battery device, characterized in that: include: The box assembly has an accommodating cavity inside; a battery cell assembly accommodated in the accommodating cavity, the battery cell assembly comprising a battery cell and a current busbar, the battery cell comprising a housing and an electrode terminal, the housing having a first wall, the electrode terminal being disposed on the first wall, the current busbar being connected to the electrode terminal to achieve electrical connection of the plurality of battery cells; A heat exchange component is disposed in the accommodating cavity, and the heat exchange component is attached to the manifold; Wherein, the heat exchange component includes at least two flexible parts, and the at least two flexible parts are stacked and arranged, and at least one flow channel is formed between the flexible parts, and the flow channel is used to accommodate the heat exchange medium.

2. The battery device according to claim 1, wherein: The heat exchange assembly includes a first area and a second area. The first area is attached to the flow collector, and the second area is attached to the first wall.

3. The battery device according to claim 2, wherein: The battery device further comprises: A heat conducting member, a portion of which is disposed between the first region and the current collector, and another portion of which is disposed between the second region and the first wall.

4. The battery device according to claim 3, wherein: The heat conducting member is heat conducting glue.

5. The battery device according to claim 1, wherein: The at least two flexible members include a first flexible member and a second flexible member, the first flexible member is located between the second flexible member and the battery cell, and the thermal conductivity of the first flexible member is greater than the thermal conductivity of the second flexible member.

6. The battery device according to any one of claims 1 to 5, characterized in that: The flexible member includes a metal layer and a non-metal layer.

7. The battery device according to claim 6, wherein: The metal layer is made of one of aluminum, copper and steel.

8. The battery device according to claim 6, wherein: The non-metallic layer is a hot-melt material.

9. The battery device according to claim 8, wherein: The non-metallic layer is made of one of polypropylene, polyvinyl chloride and polyethylene.

10. The battery device according to any one of claims 1 to 5, characterized in that: The flexible member is a metal plasticized film.

11. The battery device according to claim 10, wherein: The flexible member is an aluminum-plastic film.

12. The battery device according to claim 10, wherein: The thickness H of the flexible member satisfies 0.05 mm ≤ H ≤ 0.3 mm.

13. The battery device according to claim 12, wherein: The thickness H of the flexible member satisfies 0.08 mm ≤ H ≤ 0.2 mm.

14. The battery device according to any one of claims 1 to 5, characterized in that: The flexible member is a layered structure, and includes a corrosion-resistant layer, an isolation layer, and a waterproof layer arranged in sequence. The waterproof layer is closer to the flow channel area than the corrosion-resistant layer.

15. The battery device according to claim 14, wherein: The thickness H1 of the isolation layer satisfies 6.5 μm≤H1≤100 μm.

16. The battery device according to claim 14, wherein: The thickness H1 of the isolation layer satisfies 15 μm≤H1≤100 μm.

17. The battery device according to claim 1, wherein: The heat exchange component has a hot pressing area, which is configured to form the at least two flexible parts by hot pressing. The hot pressing area separates the interior of the heat exchange component to form the at least one flow channel.

18. The battery device according to claim 17, wherein: The width B of the hot pressing area satisfies 0.5 mm ≤ B ≤ 5 mm.

19. The battery device according to claim 18, wherein: The width B of the hot pressing area satisfies 2mm≤B≤3mm.

20. The battery device according to claim 1, wherein: The housing has a second wall, the second wall is provided with a pressure relief mechanism, and the second wall is adjacent to or opposite to the first wall.

21. An electrical device, characterized in that: The battery device comprises the battery device according to any one of claims 1 to 20, wherein the battery device is used to provide electrical energy.

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