Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device.The battery device comprises a single battery, a heat conduction part and a heat exchange assembly, and the heat exchange assembly is connected to the side portion, in the first direction, of the single battery in a heat conduction mode and comprises an outer shell and a phase change part; the outer shell comprises a first flow channel and a hollow cavity which are arranged at intervals in the direction perpendicular to the first direction, and the phase change piece is arranged in the hollow cavity and is configured to be capable of being converted between the liquid state and the gas state. The flow channel is provided with an inlet and an outlet and used for enabling a heat exchange medium to flow into the flow channel through the inlet and flow out of the flow channel through the outlet, and the heat conduction piece is clamped between the battery single body and the heat exchange assembly and is connected with the battery single body and the heat exchange assembly in a heat conduction mode. According to the battery device provided by the invention, the runners and the hollow cavity are integrated in the heat exchange assembly, so that the overall structure of the battery device is simplified, and the energy density of the battery device is 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] Battery devices are widely used in electronic devices, such as mobile phones, laptop computers, battery cars, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and electric tools, etc.

[0003] In the development of battery device technology, in addition to improving the performance of the battery device, the energy density of the battery device is also an issue that needs to be considered. Therefore, how to improve the energy density of the battery device is an issue that needs to be continuously improved in battery device technology. Utility Model Content

[0004] The present application provides a battery device and an electrical device to improve the energy density of the battery device.

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

[0006] In the first aspect, the battery device provided by the embodiment of the present application includes a battery cell, a heat conductive member and a heat exchange assembly, the heat exchange assembly is heat conductively connected to the side of the battery cell along a first direction, the heat exchange assembly includes an outer shell and a phase change member, the outer shell includes a first flow channel and a hollow cavity arranged at intervals perpendicular to the first direction, the phase change member is arranged in the hollow cavity, and is configured to be able to switch between liquid and gas. The flow channel has an inlet and an outlet, the flow channel is used to allow a heat exchange medium to flow into the flow channel through the inlet and flow out of the flow channel through the outlet, the heat conductive member is sandwiched between the battery cell and the heat exchange assembly, and heat conductively connects the battery cell and the heat exchange assembly.

[0007] The battery device provided in the embodiment of the present application is provided with a heat exchange component having a flow channel and a hollow cavity, and the hollow cavity and the flow channel are arranged at intervals in a direction perpendicular to the first direction, so that the battery cells in the high temperature zone are absorbed heat by the phase change process of the phase change element in the hollow cavity, and the battery cells in the low temperature zone are heated, so as to improve the uniformity of the temperature of the battery cells in each area. The battery cells are heated or cooled by the heat exchange between the heat exchange medium flowing in the flow channel and the battery cells, so that the battery cells work within a suitable temperature range. In this way, while the heat exchange component is used to perform heat exchange on the battery cells and improve the uniformity of the temperature of the battery cells in each area, the flow channel and the hollow cavity are integrated in the heat exchange component, which is conducive to simplifying the overall structure of the battery device and improving the energy density of the battery device.

[0008] According to some embodiments of the present application, the thermal conductive member includes a silicone pad.

[0009] In the above scheme, the silicone pad can be deformed under the pressure of the battery cell and the heat exchange component to fit well with the battery cell and the heat exchange component respectively, which is beneficial to further reduce the size of the gap between the battery cell and the heat exchange component, and further help to improve the heat transfer efficiency between the battery cell and the heat exchange component.

[0010] According to some embodiments of the present application, the hollow cavity is strip-shaped and includes a first connecting segment and a plurality of first extension segments. The plurality of first extension segments extend along the second direction and are spaced apart along the third direction. The first direction, the second direction and the third direction are perpendicular to each other. The first connecting segment connects the ends of at least two first extension segments so that the plurality of first extension segments are connected to each other.

[0011] In the above scheme, it is beneficial to increase the number of hollow cavities covered and reduce the space occupied by the hollow cavities inside the heat exchange component, which is beneficial to improve the temperature uniformity of the battery cells while reserving more space for the flow channel to facilitate more efficient heat exchange between the heat exchange medium in the flow channel and the battery cells.

[0012] According to some embodiments of the present application, the flow channel includes a second connecting section and a plurality of second extension sections, the plurality of second extension sections extend along a second direction and are arranged at intervals along a third direction, and the second connecting section connects the ends of at least two second extension sections to connect the plurality of second extension sections to each other.

[0013] In the above scheme, the flow channel and the hollow cavity can be arranged more reasonably, so that the hollow cavity and the flow channel can cover more battery cells respectively, which is beneficial to improve the temperature uniformity of the battery cells while improving the heat exchange efficiency between the flow channel and multiple battery cells, so as to achieve more efficient heat exchange for the battery cells.

[0014] According to some embodiments of the present application, along the third direction, the first extension segments and the second extension segments are arranged alternately.

[0015] In the above solution, by arranging the first extension segments and the second extension segments alternately along the third direction, it is beneficial to improve the temperature uniformity of battery cells in different regions and also to improve the heat exchange efficiency between the heat exchange medium in the flow channel and the battery cells.

[0016] According to some embodiments of the present application, the heat exchange component further includes a capillary structure, which is disposed on the inner wall of the hollow cavity and extends along an extension direction of the hollow cavity.

[0017] In the above scheme, by setting a capillary structure, it is helpful to improve the fluidity of the liquid phase change element in the hollow cavity, so that the phase change element can condense and release heat in the area where the battery cells with lower temperature are located, and evaporate and absorb heat in the area where the battery cells with higher temperature are located. This is helpful to further improve the uniformity of the temperature of the battery cells in different areas.

[0018] According to some embodiments of the present application, the capillary structure includes at least one of a metal mesh, a groove structure, and a sintered ceramic.

[0019] In the above solution, the capillary structure includes at least one of a metal mesh, a groove structure and a sintered ceramic, which is beneficial to improving the structural stability of the capillary structure, so as to improve the reliability of the capillary structure in absorbing and storing the liquid phase change element.

[0020] According to some embodiments of the present application, the phase change element includes deionized water or halogenated alkane.

[0021] In the above scheme, deionized water and halogenated hydrocarbons have relatively stable boiling points and condensation points under specific pressures. The phase change element is provided to include deionized water or halogenated hydrocarbons, so that the phase change element can evaporate or condense in time when the temperature of the battery cell reaches a predetermined range, and the battery cell can be cooled or heated in time, so as to more accurately balance the temperature of the battery cells in different areas.

[0022] According to some embodiments of the present application, the outer shell includes a first sub-portion and a second sub-portion, and the first sub-portion and the second sub-portion overlap each other along a first direction to form a hollow cavity and a flow channel.

[0023] In the above solution, by providing the outer shell with a first sub-section and a second sub-section covering each other, it is helpful to simplify the processing technology of the outer shell and facilitate the reasonable arrangement of the positions of the flow channel and the hollow cavity.

[0024] According to some embodiments of the present application, the outer shell includes a pipeline and a sealing member, the pipeline extends from the first end along the second direction, then bends and extends in the opposite direction to the second end, the first direction intersects with the second direction, the first end and the second end are connected to the sealing member, and the hollow cavity and the flow channel are extended along the extension direction of the pipeline and pass through the first end and the second end.

[0025] In the above scheme, by setting the outer shell including the pipeline and the sealing member, it is convenient to form the corresponding shape and direction of the flow channel and the hollow cavity by setting the shape and direction of the pipeline, so as to facilitate the preparation of the heat exchange component and the reasonable setting of the position of the pipeline and the hollow cavity.

[0026] According to some embodiments of the present application, the outer shell includes a plurality of pipes, the plurality of pipes are spaced apart along the third direction, the first direction, the second direction and the third direction are perpendicular to each other, and the plurality of first ends and the plurality of second ends of the plurality of pipes are connected to the same sealing member.

[0027] In the above scheme, by setting the distribution position of the pipeline relative to the battery cell, the hollow cavity and the flow channel have a suitable relative position relationship with the battery cell, so as to further improve the uniformity of the battery cell temperature and facilitate more efficient cooling or heating of the battery cell.

[0028] According to some embodiments of the present application, the outer shell includes a plate body and a joint, the joint is connected to both ends of the plate body along the second direction, the first direction and the second direction intersect, the flow channel and the hollow cavity extend along the first direction and pass through both ends of the plate body along the first direction.

[0029] In the above scheme, it is only necessary to manufacture the plate body and the joint separately and connect the two, which is conducive to simplifying the processing technology of the heat exchange component and facilitating the flexible setting of the position of the flow channel and the hollow cavity according to needs.

[0030] In a second aspect, the electrical device provided in the embodiments of the present application includes the battery device provided in any of the above embodiments.

[0031] The electric device provided in the embodiment of the present application has the same technical effect as the battery device provided in the above embodiment, and thus will not be described in detail here.

[0032] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. 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 related drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application;

[0035] Figure 2 A schematic diagram of the structure of a battery device provided in an embodiment of the present application;

[0036] Figure 3 A schematic diagram of the structure of a battery module in a battery device provided in an embodiment of the present application;

[0037] Figure 4 A schematic diagram of the explosion structure of a battery cell in a battery device provided in an embodiment of the present application;

[0038] Figure 5 A schematic diagram of an exploded structure of a battery device provided in an embodiment of the present application;

[0039] Figure 6 A schematic structural diagram of a heat exchange component in a battery device provided in an embodiment of the present application;

[0040] Figure 7 A schematic diagram of the structure of another heat exchange component in a battery device provided in an embodiment of the present application;

[0041] Figure 8 A partial cross-sectional view of a heat exchange assembly in a battery device provided in an embodiment of the present application;

[0042] Fig. 9 A schematic diagram of an exploded structure of another battery device provided in an embodiment of the present application;

[0043] Fig.10 A top view of a heat exchange assembly in a battery device is provided for this application;

[0044] Fig.11 for Fig.10 Schematic diagram of the cross-sectional structure along the middle line AA;

[0045] Fig.12 A schematic diagram of an exploded structure of another battery device provided in an embodiment of the present application;

[0046] Fig.13 for Fig.12 Schematic diagram of the cross-sectional structure of the heat exchange component.

[0047] In the drawings, the figures are not necessarily drawn to scale.

[0048] Description of reference numerals:

[0049] 1-Vehicle; 1a-Motor; 1b-Controller;

[0050] 10-battery device; 11-box; 111-first sub-box; 112-second sub-box;

[0051] 20-battery module;

[0052] 30 - battery cell; 31 - shell; 311 - housing; 312 - end cap; 32 - electrode assembly; 321 - electrode body; 322 - pole ear; 33 - electrode terminal;

[0053] 40-heat exchange component; 41-outer shell; 41a-flow channel; 411a-inlet; 412a-outlet; 413a-second connecting section; 414a-second extension section; 41b-hollow cavity; 411b-first connecting section; 412b-first extension section; 411-pipe; 412-blocking member; 413-plate body; 414-joint; 42-capillary structure;

[0054] 50-heat conducting member; 51-silicone pad;

[0055] X-first direction; Y-second direction; Z-third direction. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0057] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. 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 and secondary relationship.

[0058] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0059] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0060] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0061] The term "multiple" as used in the present application refers to more than two (including two). Similarly, the term "multiple groups" refers to more than two groups (including two groups), and the term "multiple sheets" refers to more than two sheets (including two sheets).

[0062] 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 multiple battery cells, which are connected in series, in parallel or in mixed connection through a busbar component.

[0063] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, a battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, a battery module may be formed by bundling a plurality of battery cells 30 by a cable tie.

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

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

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

[0067] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0068] In some embodiments, the battery device may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0069] 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.

[0070] The battery cells may be, 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 storage batteries, etc.

[0071] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed back and forth between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0072] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0073] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0074] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, stainless steel, stainless steel, copper, aluminum, carbon electrode, carbon, nickel or titanium with surface silver plating may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0075] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for battery cells may also be used.

[0076] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0077] As an example, the negative electrode current collector may be a metal foil or a composite current collector. For example, the metal foil may be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, copper, aluminum, carbon electrode, carbon, nickel or titanium.

[0078] In some embodiments, the negative electrode current collector has two surfaces opposite to each other in its thickness direction, and the negative electrode active material is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.

[0079] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0080] In some embodiments, the diaphragm is an isolation membrane. The present application has no particular limitation on the type of isolation membrane, and any known isolation membrane with a porous structure having good chemical stability and mechanical stability can be selected.

[0081] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without special restrictions. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without special restrictions. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surface of the positive and negative electrodes.

[0082] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0083] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0084] In some embodiments, the electrode assembly is a laminate structure.

[0085] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0086] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap closes the opening to form a closed space for accommodating substances such as the electrode assembly and the electrolyte. The shell may be provided with one or more openings. One or more end caps may also be provided.

[0087] In some embodiments, at least one electrode terminal is disposed on the housing, and the electrode terminal is electrically connected to the electrode tab of the electrode assembly. The electrode terminal may be directly connected to the electrode tab, or may be indirectly connected to the electrode tab through a current collector. The electrode terminal may be disposed on an end cap, or may be disposed on the housing.

[0088] In some embodiments, an explosion-proof valve is provided on the housing, and the explosion-proof valve is used to release the internal pressure of the battery cell.

[0089] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal prismatic battery, such as a hexagonal prismatic battery, etc. There is no particular limitation in the embodiments of the present application.

[0090] During the cycle operation of the battery device, the battery cells will generate heat, and the heat generated by the battery cells needs to be transferred to the outside of the battery device in a timely manner to maintain the normal and stable operation of the battery device. In the related art, a temperature equalizer and a heat exchanger are usually provided separately to exchange heat with the battery cells in different areas through the temperature equalizer to achieve temperature uniformity of the battery cells in different areas. The heat exchange medium in the heat exchanger is used to exchange heat with the battery cells as a whole to heat or cool them. However, the temperature equalizer and the heat exchanger each occupy a relatively high volume, which is not conducive to improving the energy density of the battery device.

[0091] In view of this, the battery device provided in the embodiment of the present application includes a battery cell, a heat conductive member and a heat exchange assembly, the heat exchange assembly is heat conductively connected to the side of the battery cell along the first direction, the heat exchange assembly includes an outer shell and a phase change member, the outer shell includes a first flow channel and a hollow cavity spaced apart in a direction perpendicular to the first direction, the phase change member is arranged in the hollow cavity and is configured to be able to switch between liquid and gas. The flow channel has an inlet and an outlet, the flow channel is used to allow a heat exchange medium to flow into the flow channel through the inlet and flow out of the flow channel through the outlet, the heat conductive member is sandwiched between the battery cell and the heat exchange assembly, and heat conductively connects the battery cell and the heat exchange assembly.

[0092] The battery device provided in the embodiment of the present application is provided with a heat exchange component having a flow channel and a hollow cavity, and the hollow cavity and the flow channel are arranged at intervals in a direction perpendicular to the first direction, so that the battery cells in the high temperature zone are absorbed heat by the phase change process of the phase change element in the hollow cavity, and the battery cells in the low temperature zone are heated, so as to improve the uniformity of the temperature of the battery cells in each area. The battery cells are heated or cooled by the heat exchange between the heat exchange medium flowing in the flow channel and the battery cells, so that the battery cells work within a suitable temperature range. In this way, while the heat exchange component is used to perform heat exchange on the battery cells and improve the uniformity of the temperature of the battery cells in each area, the flow channel and the hollow cavity are integrated in the heat exchange component, which is conducive to simplifying the overall structure of the battery device and improving the energy density of the battery device.

[0093] The technical solutions described in the embodiments of the present application are applicable to battery devices and electrical devices using the battery devices.

[0094] The battery device disclosed in the embodiment of the present application can be used in, but not limited to, electrical devices such as vehicles, ships, or aircraft. The battery device disclosed in the present application can be used to form a power supply system of the electrical device.

[0095] The embodiment of the present application provides an electric device using a battery device as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0096] For the convenience of description, the following embodiments are described by taking a vehicle 1 as an example of an electrical device in an embodiment of the present application.

[0097] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1 provided in an embodiment of the present application. The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 10 is provided inside the vehicle 1, and the battery device 10 may be provided at the bottom, head or tail of the vehicle 1. The battery device 10 may be used to power the vehicle 1, for example, the battery device 10 may be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements during the startup, navigation and operation of the vehicle 1.

[0098] The vehicle 1 may further include a controller 1b and a motor 1a, wherein the controller 1b is used to control the battery device 10 to supply power to the motor 1a, for example, to meet the power requirements of starting, navigating, and driving the vehicle 1.

[0099] In some embodiments of the present application, the battery device 10 can not only serve as an operating power source for the vehicle 1 , but also serve as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0100] Please refer to Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of the battery device 10 provided in an embodiment of the present application. Figure 3 Schematic diagram of the structure of the battery cell 30 in the battery device 10 provided in the embodiment of the present application. The battery device 10 includes a box 11 and a battery cell 30, and the battery cell 30 is accommodated in the box 11. Among them, the box 11 is used to provide a storage space for the battery cell 30, and the box 11 can adopt a variety of structures. In some embodiments, the box 11 may include a first sub-box 111 and a second sub-box 112, the first sub-box 111 and the second sub-box 112 cover each other, and the first sub-box 111 and the second sub-box 112 jointly define a storage space for accommodating the battery cell 30. The second sub-box 112 may be a hollow structure with one end open, and the first sub-box 111 may be a plate-like structure, and the first sub-box 111 covers the open side of the second sub-box 112, so that the first sub-box 111 and the second sub-box 112 jointly define a storage space; the first sub-box 111 and the second sub-box 112 may also be hollow structures both with one side open, and the open side of the first sub-box 111 covers the open side of the second sub-box 112.

[0101] In the battery device 10, there may be multiple battery cells 30, and the multiple battery cells 30 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 30 are both connected in series and in parallel. The multiple battery cells 30 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 30 is accommodated in the box 11; of course, the battery device 10 may also be a battery module 20 in the form of multiple battery cells 30 connected in series, in parallel, or in a mixed connection, and then the multiple battery modules 20 are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 11. The battery device 10 may also include other structures, for example, the battery device 10 may also include a busbar component for realizing electrical connection between the multiple battery cells 30.

[0102] The battery cell 30 may be a secondary battery or a primary battery; the battery cell 30 may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto.

[0103] Please refer to Figure 4 , Figure 4 Schematic diagram of the exploded structure of the battery cell 30 in the battery device 10 provided in the embodiment of the present application. Figure 4 As shown, the battery cell 30 includes a housing 31, an electrode assembly 32 and an electrode terminal 33. The housing 31 includes a shell 311 and an end cap 312. The shell 311 has an opening, and the end cap 312 closes the opening to isolate the internal environment of the battery cell 30 from the external environment.

[0104] The shell 311 is a component used to cooperate with the end cap 312 to form the internal environment of the battery cell 30, wherein the formed internal environment can be used to accommodate the electrode assembly 32, the electrolyte and other components. The shell 311 and the end cap 312 can be independent components. The shell 311 can be of various shapes and sizes. Specifically, the shape of the shell 311 can be determined according to the specific shape and size of the electrode assembly 32. The material of the shell 311 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0105] The end cap 312 refers to a component that covers the opening of the shell 311 to isolate the internal environment of the battery cell 30 from the external environment. Without limitation, the shape of the end cap 312 can be adapted to the shape of the shell 311 to match the shell 311. Optionally, the end cap 312 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 312 is not easily deformed when squeezed and collided, so that the battery cell 30 can have a higher structural strength and reliability can also be improved. Functional components such as electrode terminals 33 can be provided on the end cap 312. The electrode terminal 33 can be used to electrically connect to the electrode assembly 32 for outputting or inputting electrical energy of the battery cell 30. The material of the end cap 312 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this. In some embodiments, an insulating structure may be provided inside the end cap 312, and the insulating structure may be used to isolate the electrical connection components in the housing 311 from the end cap 312 to reduce the risk of short circuit. For example, the insulating structure may be plastic, rubber, or the like.

[0106] The electrode assembly 32 is a component in the battery cell 30 where an electrochemical reaction occurs. One or more electrode assemblies 32 may be included in the housing 311. The electrode assembly 32 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet, and the separator is used to separate the positive electrode sheet and the negative electrode sheet to avoid short circuits between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the electrode body 321 of the electrode assembly 32, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute the tabs 322. The positive tab and the negative tab may be located together at one end of the electrode body 321 or at both ends of the electrode body 321, respectively. During the charge and discharge process of the battery cell 30, the positive active material and the negative active material react with the electrolyte, and the tabs 322 are connected to the electrode terminals 33 to form a current loop.

[0107] First, as Figure 5 and Figure 6 As shown, the battery device 10 provided in the embodiment of the present application includes a battery cell 30, a heat conductive member 50 and a heat exchange assembly 40, the heat exchange assembly 40 is thermally connected to the side of the battery cell 30 along the first direction X, the heat exchange assembly 40 includes an outer shell 41 and a phase change member, the outer shell 41 includes a first flow channel 41a and a hollow cavity 41b arranged at intervals along a direction perpendicular to the first direction X, the phase change member is arranged in the hollow cavity 41b, and is configured to be able to switch between liquid and gas. The flow channel 41a has an inlet 411a and an outlet 412a, and the flow channel 41a is used to allow the heat exchange medium to flow into the flow channel 41a through the inlet 411a and flow out of the flow channel 41a through the outlet 412a. The heat conductive member 50 is sandwiched between the battery cell 30 and the heat exchange assembly 40, and thermally connects the battery cell 30 and the heat exchange assembly 40.

[0108] The battery device 10 may further include a housing 11, in which the battery cells 30 and the heat exchange components are accommodated. Alternatively, the heat exchange component 40 is provided as a part of the structure of the housing 11, so that the heat exchange component 40 is provided using the frame structure of the housing 11 to reduce the space occupied by the heat exchange component 40.

[0109] The heat exchange component 40 is arranged on the side of the battery cell 30. Optionally, the electrode terminal 33 can be arranged on one side of the shell 31 along the first direction X. The heat exchange component 40 can be arranged on the side of the shell 31 facing away from the electrode terminal 33 to facilitate a better thermal connection between the heat exchange component 40 and the battery cell 30.

[0110] The heat exchange assembly 40 is thermally connected to the battery cell 30. Optionally, the heat exchange assembly 40 can be directly attached to the battery cell 30, or the heat exchange assembly 40 can be thermally connected to the battery cell 30 via a thermally conductive connector.

[0111] The flow channel 41a and the hollow cavity 41b are arranged at intervals along a direction perpendicular to the first direction X, so that the flow channel 41a and the hollow cavity 41b are arranged along a direction perpendicular to the first direction X, rather than along the first direction X, so that the medium in the flow channel 41a and the phase change element in the hollow cavity 41b can more efficiently exchange heat with the battery cell 30.

[0112] One heat exchange assembly 40 may cover all or part of the battery cells 30 in the battery device 10, and correspondingly, the hollow cavity 41b and the flow channel 41a may correspond to multiple battery cells 30. For example, the hollow cavity 41b may correspond to multiple battery cells 30 in multiple regions, and similarly, the flow channel 41a may correspond to multiple battery cells 30 in multiple regions.

[0113] The flow channel 41a and the hollow cavity 41b can block each other, that is, the flow channel 41a and the hollow cavity 41b are not connected to each other, the heat exchange medium in the flow channel 41a cannot flow into the hollow cavity, and the phase change element in the hollow cavity 41b cannot flow into the flow channel 41a.

[0114] The flow channel 41a and the hollow cavity 41b can be bent and extended in strips, respectively, so that the heat exchange medium flowing through the flow channel 41a can exchange heat with multiple battery cells 30, and the first working medium in the hollow cavity 41b can balance multiple battery cells 30 in multiple regions. Optionally, the heat exchange component 40 can have one or more hollow cavities 41b.

[0115] The hollow cavity 41b can be sealed to reduce the risk of phase change component loss. Since the phase change component can be converted between liquid and gas, in the battery cell 30 in the area with higher temperature, the phase change component in the corresponding first hollow cavity 41b evaporates, converts from liquid to gas, and absorbs the heat in the battery cell 30. Since the gaseous phase change component can flow in the hollow cavity 41b, when the gaseous phase change component flows to the area corresponding to the battery cell 30 with lower temperature, it will condense and release heat to the battery cell 30 to heat the battery cell 30. In this way, the phase change component evaporates and flows repeatedly in the hollow cavity 41b, and condenses in the area with lower temperature of the battery cell 30. The phase change component repeatedly absorbs and releases heat to balance the temperature of the battery cells 30 in different areas, so that the temperature of the battery cells 30 in different areas is more uniform, which is conducive to improving the temperature uniformity and reliability of the battery cells 30.

[0116] The flow channel 41a has an inlet 411a and an outlet 412a. Taking cooling the battery cell 30 as an example, the low-temperature heat exchange medium enters the flow channel 41a through the inlet 411a and flows to the outlet 412a. During the flow of the low-temperature heat exchange medium in the flow channel 41a, the low-temperature heat exchange medium exchanges heat with the battery cell 30. The heat is transferred from the battery cell 30 to the heat exchange medium, and the temperature of the heat exchange medium gradually increases. The high-temperature heat exchange medium only flows out of the flow channel 41a through the outlet 412a. This cycle continues, and the heat of the battery cell 30 is taken away by the low-temperature heat exchange medium.

[0117] A portion of a battery cell 30 may be arranged opposite to the hollow cavity 41b, and a portion thereof may be arranged opposite to the flow channel 41a. In this way, the temperature of the battery cells 30 in various regions may be balanced through the phase change element, and heat exchange may be performed with the heat exchange medium in the flow channel 41a to heat or cool the battery cells 30.

[0118] Optionally, the heat exchange component 40 may have a flow channel 41a, and the flow channel 41a is distributed in an "S" shape or a "bow" shape in the heat exchange component 40. Similarly, the hollow cavity 41b may be arranged in an "S" shape or a "bow" shape in the heat exchange component 40, and the flow channel 41a and the hollow cavity 41b may be arranged alternately.

[0119] The heat conductive member 50 is sandwiched between the battery cell 30 and the heat exchange assembly 40, so the heat conductive member 50 can be directly attached to the battery cell 30 and the heat exchange assembly 40, which is beneficial to reduce the size of the gap on the heat transfer path between the battery cell 30 and the heat exchange assembly 40, that is, reduce the thermal resistance between the battery cell 30 and the heat exchange assembly 40, and improve the heat transfer efficiency between the battery cell 30 and the heat exchange assembly 40.

[0120] The battery device 10 provided in the embodiment of the present application is provided with a heat exchange component 40 having a flow channel 41a and a hollow cavity 41b, and the hollow cavity 41b and the flow channel 41a are arranged at intervals in a direction perpendicular to the first direction X, so as to absorb heat from the battery cells 30 in the high temperature zone through the phase change process of the phase change element in the hollow cavity 41b, and heat the battery cells 30 in the low temperature zone, so as to improve the uniformity of the temperature of the battery cells 30 in each area. The heat exchange medium flowing in the flow channel 41a exchanges heat with the battery cells 30, so that the battery cells 30 work within a suitable temperature range. In this way, the flow channel 41a and the hollow cavity 41b are integrated in the heat exchange component 40 while performing heat exchange on the battery cells 30 and improving the uniformity of the temperature of the battery cells 30 in each area, which is conducive to simplifying the overall structure of the battery device 10 and improving the energy density of the battery device 10.

[0121] In some embodiments, Figure 8As shown, the heat conducting member 50 includes a silicone pad 51 .

[0122] The silicone pad 51 has a certain elasticity. The silicone pad 51 is sandwiched between the battery cell 30 and the heat exchange component 40. Then, under the pressure of the battery cell 30 and the heat exchange component 40, the silicone pad 51 can be deformed to fit well with the battery cell 30 and the heat exchange component 40 respectively, which is beneficial to further reduce the size of the gap between the battery cell 30 and the heat exchange component 40, and further help to improve the heat transfer efficiency between the battery cell 30 and the heat exchange component 40.

[0123] In some embodiments, Figure 7 As shown, the hollow cavity 41b is strip-shaped and includes a first connecting segment 411b and a plurality of first extension segments 412b. The plurality of first extension segments 412b extend along the second direction Y and are arranged at intervals along the third direction Z. The first direction X, the second direction Y and the third direction Z are perpendicular to each other. The first connecting segment 411b connects the ends of at least two first extension segments 412b so that the plurality of first extension segments 412b are connected to each other.

[0124] The first connecting section 411b is connected to the ends of at least two first extension sections 412b. Optionally, the first connecting section 411b can connect the ends of two first extension sections 412b so that the two first extension sections 412b are connected in parallel or in series. Alternatively, one first connecting section 411b can be connected to the ends of more than three first extension sections 412b so that the three or more first extension sections 412b are connected in parallel. Therefore, different first extension sections 412b can be connected in parallel, in series, or in both series and in parallel by different connection modes between the first connecting section 411b and the first extension section 412b. Therefore, the hollow cavity 41b can be provided with one or more first connecting sections 411b as required.

[0125] Since the hollow cavity 41b is strip-shaped and includes a first extension section 412b and a first connecting section 411b, the hollow cavity 41b can be arranged relative to more battery cells 30 to facilitate heat exchange between the phase change element in the hollow cavity 41b and the multiple battery cells 30. The liquid phase change element flows in a larger range in the hollow cavity 41b to balance the temperatures of more battery cells 30, which is beneficial to further improve the uniformity of the temperature of the battery cells 30.

[0126] Since the first extension sections 412b are arranged at intervals along the third direction Z, the flow channels 41a can be arranged in the gaps between the strip-shaped hollow cavities 41b, so that the flow channels 41a and the hollow cavities 41b are arranged alternately, thereby increasing the number of battery cells 30 covered by the flow channels 41a and the hollow cavities 41b.

[0127] Exemplarily, the battery cells 30 can be arranged in an array along the second direction Y and the third direction Z, and the number of first extension segments 412b corresponds at least one to the number of battery cells 30 arranged along the third direction Z, and each first extension segment 412b covers more battery cells 30 arranged along the second direction Y.

[0128] Therefore, such a configuration is beneficial to increase the number of hollow cavities 41b covered and reduce the space occupied by the hollow cavities 41b inside the heat exchange assembly 40. It is beneficial to improve the temperature uniformity of the battery cells 30 while reserving more space for the flow channel 41a to facilitate more efficient heat exchange between the heat exchange medium in the flow channel 41a and the battery cells 30.

[0129] In some embodiments, Figure 7 As shown, the flow channel 41a includes a second connecting segment 413a and a plurality of second extension segments 414a. The plurality of second extension segments 414a extend along the second direction Y and are arranged at intervals along the third direction Z. The second connecting segment 413a connects the ends of at least two second extension segments 414a so that the plurality of second extension segments 414a are connected to each other.

[0130] The second connecting section 413a connects the ends of at least two second extension sections 414a. Optionally, one second connecting section 413a can connect two, three or more second extension sections 414a to make the multiple second extension sections 414a interconnected. Different second extension sections 414a can be connected in parallel, in series, or both in series and in parallel.

[0131] By setting the second extension section 414a to extend along the second direction Y, the flow channel 41a can cover more battery cells 30 to perform heat exchange with the multiple battery cells 30. Since the first extension section 412b and the second extension section 414a both extend along the second direction Y and are arranged at intervals along the third direction Z, the first extension section 412b and the second extension section 414a can both cover multiple battery cells 30 and perform heat exchange with the multiple battery cells 30 respectively, and facilitate a more reasonable arrangement of the flow channel 41a and the hollow cavity 41b.

[0132] Therefore, with such a configuration, the flow channel 41a and the hollow cavity 41b can be arranged more reasonably, so that the hollow cavity 41b and the flow channel 41a can respectively cover more battery cells 30, which is beneficial to improving the temperature uniformity of the battery cells 30 while improving the heat exchange efficiency between the flow channel 41a and multiple battery cells 30, so as to perform more efficient heat exchange on the battery cells 30.

[0133] In some embodiments, Figure 7 As shown, along the third direction Z, the first extension segments 412b and the second extension segments 414a are arranged alternately.

[0134] The first extension segments 412b and the second extension segments are alternately arranged along the third direction Z, and a second extension segment 414a is disposed between two adjacent first extension segments 412b, and a first extension segment 412b is disposed between two adjacent second extension segments 414a.

[0135] Thus, the first extension segment 412b and the second extension segment 414a are arranged more evenly along the second direction Y, the phase change element in the hollow cavity 41b can better balance the temperature of the multiple battery cells 30, and the efficiency of heat exchange between the flow channel 41a and the multiple battery cells 30 is also higher.

[0136] Therefore, by arranging the first extension segments 412b and the second extension segments 414a alternately along the third direction Z, it is beneficial to improve the temperature uniformity of the battery cells 30 in different regions and also to improve the heat exchange efficiency between the heat exchange medium in the flow channel 41a and the battery cells 30.

[0137] In some embodiments, Figure 8 As shown, the heat exchange component 40 further includes a capillary structure 42 , which is disposed on the inner wall of the hollow cavity 41 b and extends along the extension direction of the hollow cavity 41 b .

[0138] It can be understood that the gaseous phase change element can flow in the hollow cavity 41b under the action of the pressure difference, and the liquid phase change element can be adsorbed by the capillary structure 42 when it encounters the capillary structure 42 in the hollow cavity 41b, and flows along the capillary structure 42 in the hollow cavity 41b to the area where the battery cell 30 with higher temperature is located, so that the liquid phase change element can absorb the heat of the battery cell 30 by evaporation.

[0139] Therefore, by setting the capillary structure 42, it is helpful to improve the fluidity of the liquid phase change element in the hollow cavity 41b, so that the phase change element can condense and release heat in the area where the battery cells 30 with lower temperatures are located, and evaporate and absorb heat in the area where the battery cells 30 with higher temperatures are located. This is helpful to further improve the uniformity of the temperature of the battery cells 30 in different areas.

[0140] In some embodiments, the capillary structure 42 includes at least one of a metal mesh, a groove structure, and a sintered ceramic.

[0141] The metal mesh, the groove structure and the sintered ceramic structure can form more microscopic capillary channels 411, and the structure of the formed capillary channels is relatively stable, so that the capillary structure 42 can still provide a stable capillary effect after the battery device 10 cycles for many times. Moreover, more microscopic capillary channels 411 can capillarily adsorb more liquid phase change components.

[0142] Therefore, providing the capillary structure 42 to include at least one of a metal mesh, a groove structure, and a sintered ceramic is beneficial to improving the structural stability of the capillary structure 42 , so as to improve the reliability of the capillary structure 42 in absorbing and storing the liquid phase change element.

[0143] In some embodiments, the phase change element includes deionized water or a halogenated alkane.

[0144] Deionized water and halogenated hydrocarbons have relatively stable boiling points and condensation points under specific pressures. The phase change element is provided to include deionized water or halogenated hydrocarbons, so that the phase change element can evaporate or condense in time when the temperature of the battery cell 30 reaches a predetermined range, and the battery cell 30 can be cooled or heated in time, so as to more accurately balance the temperature of the battery cells 30 in different areas.

[0145] In some embodiments, the outer shell 41 includes a first sub-portion and a second sub-portion, and the first sub-portion and the second sub-portion overlap each other along the first direction X to form a hollow cavity 41 b and a flow channel 41 a.

[0146] Optionally, the first sub-section may be plate-shaped, and a groove may be provided on the side of the second sub-section facing the first sub-section, and the flow channel 41a and the hollow cavity 41b are formed after the first sub-section and the second sub-section overlap each other along the first direction X. Alternatively, the first sub-section may have a groove on the side facing the second sub-section, and the second sub-section may also have a groove on the side facing the first sub-section, and after the first sub-section and the second sub-section overlap each other along the first direction X, the groove of the first sub-section and the groove of the second sub-section overlap each other to form the flow channel 41a and the hollow cavity 41b.

[0147] The first sub-section and the second sub-section may be connected by a process such as brazing, so that the first sub-section and the second sub-section are sealed and connected to each other.

[0148] By providing the outer shell 41 with a first sub-portion and a second sub-portion covering each other, it is advantageous to simplify the processing technology of the outer shell 41 and facilitate the reasonable arrangement of the positions of the flow channel 41 a and the hollow cavity 41 b.

[0149] In some embodiments, Fig. 9 , Fig.10 and Fig.11 As shown, the outer shell 41 includes a pipe 411 and a sealing member 412. The pipe 411 extends from the first end along the second direction Y, then bends and extends in the opposite direction to the second end. The first direction X intersects with the second direction Y. The first end and the second end are connected to the sealing member 412. The hollow cavity 41b and the flow channel 41a are extended along the extension direction of the pipe 411 and pass through the first end and the second end.

[0150] The pipe 411 has a first end that is bent along the second direction Y and extends to the second end, so the pipe 411 can be "U" shaped. Since the hollow cavity 41b and the flow channel 41a are extended along the extension direction of the pipe 411, the hollow cavity 41b and the pipe 411 can be "U" shaped respectively.

[0151] Each pipe 411 may include a plurality of through holes extending along the extending direction of the pipe 411, the through holes are "U" shaped and penetrate the first end and the second end. A portion of the plurality of through holes is used to form the hollow cavity 41b, and another portion is used to form the flow channel 41a.

[0152] The first end and the second end are connected to the plugging member 412, and the flow channel 41a and the hollow cavity 41b can be isolated by the plugging member 412, and the heat exchange medium can be introduced into the flow channel 41a in the pipeline 411 through the plugging member 412, and the heat exchange medium in the flow channel 41a of the pipeline 411 can be led out. Therefore, the plugging member 412 does not mean that the flow channel 41a and the hollow cavity 41b are completely blocked, but only provides a certain sealing effect on the flow channel 41a and the hollow cavity 41b, and the flow channel 41a or the hollow cavity 41b in the pipeline 411 have a corresponding communication relationship.

[0153] Optionally, the outer shell 41 may include one or more pipes 411, and the hollow cavities 41b in the multiple pipes 411 may be interconnected through a plugging member 412, or the hollow cavities 41b in different pipes 411 may not be interconnected. Similarly, the flow channels 41a in the multiple pipes 411 may be connected in series or in parallel through a plugging member 412, or the flow channels 41a in different pipes 411 may be isolated from each other.

[0154] By setting the outer shell 41 including the pipe 411 and the sealing member 412, it is convenient to form the corresponding shapes and directions of the flow channel 41a and the hollow cavity 41b by setting the shape and direction of the pipe 411. In this way, it is convenient to prepare the heat exchange component 40 and to reasonably set the positions of the pipe 411 and the hollow cavity 41b.

[0155] In some embodiments, Fig. 9 and Fig.10 As shown, the outer shell 41 includes a plurality of pipes 411 , which are arranged at intervals along the third direction Z. The first direction X, the second direction Y and the third direction Z are perpendicular to each other, and the plurality of first ends and the plurality of second ends of the plurality of pipes 411 are connected to the same blocking member 412 .

[0156] In this way, a plurality of "U"-shaped pipes 411 can be formed, and a plurality of "U"-shaped hollow cavities 41b and flow channels 41a can be provided. By setting the distribution position of the pipes 411 relative to the battery cells 30, the hollow cavities 41b and the flow channels 41a have a suitable relative position relationship with the battery cells 30, so as to further improve the temperature uniformity of the battery cells 30 and facilitate more efficient cooling or heating of the battery cells 30.

[0157] In some embodiments, Fig.12 and 13 As shown, the outer shell 41 includes a plate body 413 and a joint 414, the joint 414 is connected to both ends of the plate body 413 along the second direction Y, the first direction X and the second direction Y intersect, the flow channel 41a and the hollow cavity 41b extend along the first direction X and pass through both ends of the plate body 413 along the first direction X.

[0158] The plate body 413 may have a plurality of through holes spaced apart along the third direction Z, and the plurality of through holes communicate with both ends of the plate body 413 along the second direction Y. By connecting the joint 414 to both ends of the plate body 413 along the second direction Y, the through holes in the plate body 413 are blocked or drained, so as to isolate the hollow cavity 41b and the flow channel 41a, and facilitate the joint 414 to introduce the heat exchange medium into the flow channel 41a and then lead it out of the flow channel 41a.

[0159] Therefore, the joint 414 has a blocking effect on the flow channel 41a or the hollow cavity 41b, and has a drainage effect on the flow channel 41a to guide the heat exchange value to flow through the flow channel 41a.

[0160] With such an arrangement, it is only necessary to manufacture the plate body 413 and the joint 414 separately and connect the two, which is conducive to simplifying the processing technology of the heat exchange component 40 and facilitating the flexible setting of the positions of the flow channel 41a and the hollow cavity 41b as needed.

[0161] In a second aspect, the electrical device provided in the embodiments of the present application includes the battery device 10 provided in any of the above embodiments, and the battery device 10 is used to provide electrical energy.

[0162] The electric device provided in the embodiment of the present application has the same technical effect as the battery device 10 provided in any of the above embodiments, and thus will not be described in detail here.

[0163] In some embodiments, the battery device 10 provided in the embodiment of the present application includes a battery cell 30, a heat conductive member 50, a capillary structure 42 and a heat exchange assembly 40, the heat exchange assembly 40 is thermally connected to the side of the battery cell 30 along the first direction X, the heat exchange assembly 40 includes an outer shell 41 and a phase change member, the outer shell 41 includes a flow channel 41a and a hollow cavity 41b arranged at intervals along a direction perpendicular to the first direction X, the first direction X intersects with the second direction Y, the phase change member is arranged in the hollow cavity 41b, and is configured to be able to switch between liquid and gas. The flow channel 41a has an inlet 411a and an outlet 412a, and the flow channel 41a is used to allow the heat exchange medium to flow into the flow channel 41a through the inlet 411a and flow out of the flow channel 41a through the outlet 412a. The heat conductive member 50 is sandwiched between the battery cell 30 and the heat exchange assembly 40, and thermally connects the battery cell 30 and the heat exchange assembly 40, and the heat member includes a silicone pad 51. The hollow cavity 41b is strip-shaped and includes a first connecting section 411b and a plurality of first extension sections 412b. The plurality of first extension sections 412b extend along the second direction Y and are arranged at intervals along the third direction Z. The first direction X, the second direction Y and the third direction Z are perpendicular to each other. The first connecting section 411b connects the ends of at least two first extension sections 412b so that the plurality of first extension sections 412b are connected to each other. The flow channel 41a includes a second connecting section 413a and a plurality of second extension sections 414a. The plurality of second extension sections 414a extend along the second direction Y and are arranged at intervals along the third direction Z. The second connecting section 413a connects the ends of at least two second extension sections 414a so that the plurality of second extension sections 414a are connected to each other. Along the third direction Z, the first extension sections 412b and the second extension sections 414a are arranged alternately. The capillary structure 42 is arranged on the inner wall of the hollow cavity 41b and is extended along the extension direction of the hollow cavity 41b. The capillary structure 42 includes at least one of a metal mesh, a groove structure and a sintered ceramic, and the phase change element includes deionized water or a halogenated alkane. The outer shell 41 includes a first sub-section and a second sub-section, and the first sub-section and the second sub-section overlap each other along the first direction X to form a hollow cavity 41b and a flow channel 41a.

[0164] The battery device 10 provided in the embodiment of the present application is provided with a heat exchange component 40 having a flow channel 41a and a hollow cavity 41b, and the hollow cavity 41b and the flow channel 41a are arranged at intervals in a direction perpendicular to the first direction X, so as to absorb heat from the battery cells 30 in the high temperature zone through the phase change process of the phase change element in the hollow cavity 41b, and heat the battery cells 30 in the low temperature zone, so as to improve the uniformity of the temperature of the battery cells 30 in each area. The heat exchange medium flowing in the flow channel 41a exchanges heat with the battery cells 30, so that the battery cells 30 work within a suitable temperature range. In this way, the flow channel 41a and the hollow cavity 41b are integrated in the heat exchange component 40 while performing heat exchange on the battery cells 30 and improving the uniformity of the temperature of the battery cells 30 in each area, which is conducive to simplifying the overall structure of the battery device 10 and improving the energy density of the battery device 10.

[0165] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that: include: Battery cells; a heat exchange assembly, thermally connected to the side of the battery cell along the first direction, the heat exchange assembly comprising an outer shell and a phase change member, the outer shell comprising flow channels and a hollow cavity spaced apart in a direction perpendicular to the first direction, the phase change member being disposed in the hollow cavity and configured to be convertible between a liquid state and a gas state; The flow channel has an inlet and an outlet, and the flow channel is used to allow the heat exchange medium to flow into the flow channel through the inlet and flow out of the flow channel through the outlet; The heat conducting member is sandwiched between the battery cell and the heat exchange assembly, and thermally connects the battery cell and the heat exchange assembly.

2. The battery device according to claim 1, characterized in that: The heat conducting member comprises a silica gel pad.

3. The battery device according to claim 1, characterized in that: The hollow cavity is strip-shaped and includes a first connecting section and multiple first extension sections. The multiple first extension sections extend along the second direction and are arranged at intervals along the third direction. The first direction, the second direction and the third direction are perpendicular to each other. The first connecting section connects the ends of at least two of the first extension sections to connect the multiple first extension sections to each other.

4. The battery device according to claim 3, characterized in that: The flow channel includes a second connecting section and a plurality of second extending sections, wherein the plurality of second extending sections extend along the second direction and are arranged at intervals along the third direction, and the second connecting section connects ends of at least two of the second extending sections to connect the plurality of second extending sections to each other.

5. The battery device according to claim 4, characterized in that: Along the third direction, the first extending sections and the second extending sections are arranged alternately.

6. The battery device according to claim 1, characterized in that: The heat exchange component further includes a capillary structure, which is arranged on the inner wall of the hollow cavity and extends along the extension direction of the hollow cavity.

7. The battery device according to claim 6, characterized in that: The capillary structure includes at least one of a metal mesh, a groove structure, and sintered ceramics.

8. The battery device according to claim 1, characterized in that: The phase change element includes deionized water or halogenated alkane.

9. The battery device according to any one of claims 1 to 8, characterized in that: The outer shell includes a first sub-portion and a second sub-portion, and the first sub-portion and the second sub-portion overlap each other along the first direction to form the hollow cavity and the flow channel.

10. The battery device according to any one of claims 1 to 8, characterized in that: The outer shell includes a pipeline and a sealing member. The pipeline extends from the first end along the second direction, then bends and extends in the opposite direction to the second end. The first direction intersects with the second direction. The first end and the second end are connected to the sealing member. The hollow cavity and the flow channel are extended along the extension direction of the pipeline and pass through the first end and the second end.

11. The battery device according to claim 10, characterized in that: The outer shell includes a plurality of the pipes, the plurality of the pipes are arranged at intervals along the third direction, the first direction, the second direction and the third direction are perpendicular to each other, and the plurality of the first ends and the plurality of the second ends of the plurality of the pipes are connected to the same sealing member.

12. The battery device according to any one of claims 1 to 8, characterized in that: The outer shell includes a plate body and a joint, the joint is connected to both ends of the plate body along the second direction, the first direction and the second direction intersect, the flow channel and the hollow cavity extend along the first direction and pass through both ends of the plate body along the first direction.

13. An electrical device, characterized in that: The invention comprises a battery device as claimed in any one of claims 1 to 12, wherein the battery device is used to provide electrical energy.

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