Thermal management assembly, battery device and electric device

Abstract

The invention discloses a thermal management assembly, a battery device and a power utilization device, and belongs to the technical field of batteries, and the battery device comprises a battery monomer assembly and the thermal management assembly; the battery monomer assembly comprises a plurality of battery monomers; the heat management assembly is arranged on one side of the battery monomer assembly in the first direction, the heat management assembly comprises a heat pipe and a heat exchange piece, the heat pipe comprises a heat pipe cavity, a capillary structure and a phase change material, the capillary structure and the phase change material are arranged in the heat pipe cavity, and a flow channel for accommodating a heat exchange medium is formed in the heat exchange piece; at least one end of the heat pipe cavity is connected with the heat exchange piece, and the internal space of the heat pipe cavity is independent of the flow channel; wherein the heat pipe is in heat conduction connection with the battery monomers, and the heat pipe is used for transferring heat of the battery monomers to the heat exchange piece. According to the technical scheme, the reliability of the battery device can be improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] How to improve the reliability of battery devices is an urgent problem to be solved in battery technology. Summary of the invention

[0004] In view of the above problems, the embodiments of the present application provide a thermal management component, a battery device, and an electrical device, which can improve the reliability of the battery device.

[0005] In a first aspect, an embodiment of the present application provides a battery device, comprising a battery cell assembly and a thermal management assembly; the battery cell assembly comprises a plurality of battery cells; the thermal management assembly is arranged on one side of the battery cell assembly in a first direction, the thermal management assembly comprises a heat pipe and a heat exchange element, the heat pipe comprises a heat pipe cavity, a capillary structure and a phase change material, the capillary structure and the phase change material are arranged inside the heat pipe cavity, the heat exchange element has a flow channel for accommodating a heat exchange medium inside; at least one end of the heat pipe cavity is connected to the heat exchange element, and the internal space of the heat pipe cavity is independent of the flow channel; wherein the heat pipe is thermally connected to the battery cell, and the heat pipe is used to transfer the heat of the battery cell to the heat exchange element.

[0006] In the above technical solution, a capillary structure and a phase change material are arranged in the cavity of the temperature-averaging part. The phase change material can be quickly vaporized after being heated so as to move to the heat exchange part with higher efficiency in the cavity of the temperature-averaging part, thereby allowing the heat to diffuse quickly and transfer the heat to the heat exchange part. A flow channel for conducting a heat exchange medium is arranged inside the heat exchange part, so that the vaporized phase change material can be quickly liquefied after heat exchange with the heat exchange medium, and can move to the battery cell with high temperature with higher efficiency in cooperation with the capillary structure, so that the phase change material can circulate and move in the cavity of the temperature-averaging part with higher efficiency, forming a hot and cold cycle, reducing the risk of heat concentration in the battery cell thermally connected to the temperature-averaging part, thereby improving the reliability of the battery device.

[0007] In some embodiments, on a plane perpendicular to the first direction, an orthographic projection of the battery cell at least partially overlaps with an orthographic projection of the heat pipe.

[0008] In the above technical solution, on a plane perpendicular to the first direction, the orthographic projection of the battery cell and the orthographic projection of the heat pipe at least partially overlap, making it easier for the heat pipe to directly contact the battery cell or indirectly contact the battery cell through a heat-conducting structure, thereby facilitating heat exchange between the heat pipe and the battery cell.

[0009] In some embodiments, the heat exchange element is provided with a medium inlet and a medium outlet communicated with the flow channel.

[0010] In the above technical solution, a medium inlet and a medium outlet are provided for the heat exchange medium to flow into and out of the flow channel, so that the heat exchange medium in the flow channel is exchanged with the outside, so that the temperature of the heat exchange medium in the flow channel is kept at a lower state, so as to increase the liquefaction rate of the gasified phase change material. This reduces the risk of heat concentration in the battery cell connected to the temperature equalizing part, thereby improving the reliability of the battery device.

[0011] In some embodiments, a cross section of the flow channel perpendicular to the first direction is annular.

[0012] In the above technical solution, the cross-section of the flow channel perpendicular to the first direction is annular, so that when the heat exchange medium flows along the flow channel, it is easier to flow in a spiral shape in the annular flow channel due to the action of centrifugal force, which facilitates heat exchange between the heat exchange media and makes the temperature of the heat exchange medium rise evenly, so that the heat transferred from the uniform temperature part can be absorbed more evenly, thereby improving the heat exchange efficiency of the uniform temperature part and the heat exchange part, and thus improving the reliability of the battery device.

[0013] In some embodiments, the heat exchange element is a heat exchange tube.

[0014] In the above technical solution, the heat exchange element is a heat exchange tube, that is, the two components in the thermal management assembly are formed separately, which facilitates the manufacture and assembly of the temperature equalizing part, reduces the manufacturing difficulty of the thermal management assembly, and thus reduces the manufacturing cost of the battery device.

[0015] In some embodiments, the heat exchange tube is arranged around the plurality of heat pipes, and both ends of the heat pipes are connected to the heat exchange tubes.

[0016] In the above technical solution, by setting the number of heat pipes to multiple, the area covered by the heat pipes is increased, so that it is convenient for the heat pipes to cover multiple battery cells in the battery assembly, reducing the risk of heat concentration in the battery cells, thereby improving the reliability of the battery device. At the same time, the heat exchange tube is arranged around the heat pipe, thereby increasing the area of ​​the heat pipe that can be used for heat exchange by the heat exchange tube, improving the heat exchange efficiency, thereby improving the reliability of the battery device; and both ends of the heat pipe are connected to the heat exchange tube, which reduces the size of the cavity that the phase change material in a part of the heat pipe needs to flow through when it moves to the heat exchange tube after vaporization, so that the phase change material circulates and moves in the cavity of the uniform temperature part with higher efficiency, forming a cold and hot cycle, reducing the risk of heat concentration in the battery cells that are thermally connected to the uniform temperature part, thereby improving the reliability of the battery device.

[0017] In some embodiments, the plurality of heat pipes are spaced apart along the second direction, and the heat pipes extend along a third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0018] In the above technical solution, a plurality of heat exchange tubes are arranged along the second direction, which reduces the manufacturing difficulty of the thermal management component and is conducive to improving the process repeatability of the thermal management component.

[0019] In some embodiments, a plurality of the heat exchange tubes are provided, the plurality of the heat exchange tubes are arranged along the second direction, and a plurality of the heat pipes are provided in each of the heat exchange tubes.

[0020] In the above technical solution, by providing a plurality of heat exchange tubes and providing a plurality of heat pipes in each of the heat exchange tubes, the number of heat pipes required for heat exchange by a single heat exchange tube is reduced. At the same time, compared with the situation where one heat exchange tube is arranged around all the heat pipes, the length of the flow channel of a single heat exchange tube is reduced, the slow flow rate of the heat exchange medium caused by the long flow channel is reduced, the heat exchange efficiency is improved, and the total length of the heat exchange tube is increased. The area of ​​the heat exchange tube that can exchange heat with the heat pipe is increased, and the risk of heat concentration in the battery cell that is thermally connected to the temperature equalizing part is reduced, thereby improving the reliability of the battery device.

[0021] In some embodiments, the plurality of heat pipes are arranged into two groups along a third direction, the heat exchange tube is located between the two groups of heat pipes, the plurality of heat pipes in each group of heat pipes are arranged along a second direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0022] In the above technical solution, the heat exchange tube is located between the two groups of heat pipes to fully utilize the two tube sections of the heat exchange tube that are relatively arranged in the third direction, so that the heat exchange tube can be connected to more heat pipes to receive more heat from battery cells transferred by the heat pipes, thereby reducing the risk of heat concentration in a larger range of battery cells, thereby improving the reliability of the battery device.

[0023] In some embodiments, the thermal management assembly further includes a support plate for supporting the battery cell assembly along the first direction, and the heat pipe and the heat exchange element are arranged on a side of the support plate away from the battery cell assembly along the first direction.

[0024] In the above technical solution, the heat pipe and the heat exchange element are arranged on the side of the support plate away from the battery cell assembly. Therefore, when the heat pipe and the heat exchange element leak, the heat exchange medium and the phase change material can be isolated by the support plate, thereby reducing the risk of the heat exchange medium phase change material causing an internal short circuit in the battery cell and improving the reliability of the battery device.

[0025] In some embodiments, the thermal management component further includes a joint, which is disposed on a side of the support plate away from the heat exchange element along the first direction, and the joint is in communication with the heat exchange element.

[0026] In the above technical solution, a joint is provided on the side of the support plate away from the heat exchange tube, and the heat exchange medium is allowed to flow into and out of the flow channel through the joint, so the structure is simple and easy to implement.

[0027] In some embodiments, the heat pipe is welded or bonded to the heat exchange element.

[0028] In the above technical solution, the heat pipe is welded or bonded to the heat exchange element. On the one hand, welding or bonding can make the heat pipe and the heat exchange element connected more tightly, thereby facilitating heat exchange between the heat pipe and the heat exchange element, improving the heat exchange efficiency between the heat pipe and the heat exchange element, and thus improving the reliability of the battery device; on the other hand, the structural strength of the connection between the heat pipe and the heat exchange element is improved, thereby improving the reliability of the thermal management component.

[0029] In the second aspect, the embodiments of the present application also provide a thermal management component, comprising: a heat pipe and a heat exchange element; the heat pipe comprises a heat pipe cavity, a capillary structure and a phase change material, and the capillary structure and the phase change material are arranged inside the heat pipe cavity; the heat exchange element has a flow channel for accommodating a heat exchange medium; at least one end of the heat pipe cavity is connected to the heat exchange element, and the internal space of the heat pipe cavity is independent of the flow channel.

[0030] In a third aspect, an embodiment of the present application further provides an electrical device, comprising the above-mentioned battery device, wherein the battery device is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] 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.

[0032] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application; Figure 2 An exploded view of the structure of a battery device provided in some embodiments of the present application; Figure 3 An exploded view of a battery device provided in some other embodiments of the present application; Figure 4 A schematic structural diagram of a first thermal management component provided for some embodiments of the present application; Figure 5 for Figure 4 Sectional view of AA in the middle; Figure 6 A schematic diagram of the structure of a second thermal management component provided in some embodiments of the present application; Figure 7 A schematic diagram of the structure of a third thermal management component provided in some embodiments of the present application; Figure 8 A fourth thermal management component is provided for some embodiments of the present application.

[0033] Icons: 1000-vehicle; 100-battery device; 10-box; 11-first box body; 111-bottom plate; 112-frame; 12-second box body; 121-cover; 20-battery cell assembly; 21-battery cell; 21A-first battery cell; 21B-second battery cell; 21C-third battery cell; 30-thermal management component; 31-heat pipe; 31A-cavity; 31B-capillary structure; 31C-capillary hole; 311-heat pipe cavity; 311A-first end; 311B-second end; 32-heat exchange element; 321-heat exchange tube; 321A-first pipe section; 321B-second pipe section; 321C-transition section; 34-support plate; 341-connector; 200-controller; 300-motor; X-second direction; Y-third direction; Z-first direction. DETAILED DESCRIPTION

[0034] 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 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.

[0035] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings 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.

[0036] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places 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.

[0037] 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.

[0038] 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.

[0039] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0040] The term “plurality” used in this application refers to two or more (including two).

[0041] 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.

[0042] 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, and the like.

[0043] In the related art, a battery cell generally includes an outer shell and an electrode assembly. The outer shell may include a shell and an end cover. The shell has an opening. After the electrode assembly is loaded into the shell, the opening of the shell can be closed by the end cover to form an enclosed space inside the shell to accommodate the electrode assembly.

[0044] The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and released back and forth between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to reduce the risk of short circuit between the positive and negative electrodes, while allowing active ions to pass through.

[0045] 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.

[0046] In some embodiments, the electrode assembly is a laminate structure.

[0047] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0048] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0049] The shell is used to encapsulate the electrode assembly and electrolyte and other components. The shell can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum-plastic film.

[0050] As an example, the battery cell may 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 battery, such as a hexagonal battery.

[0051] The battery apparatus (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 (Battery Cell Assembly) may include multiple battery cells, and the multiple battery cells are connected in series, in parallel or in mixed connection through a busbar component.

[0052] 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 by a cable tie.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] The following will mainly focus on the rectangular battery cell. It should be understood that the embodiments described below are also applicable to cylindrical battery cells, soft-pack battery cells, or blade battery cells in some aspects.

[0059] The development of battery technology must take into account many design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, battery reliability must also be considered.

[0060] In order to improve the working reliability and stability of the battery in the battery assembly scheme, a thermal management component is usually set in the box. The thermal management component is used to accommodate the heat exchange medium to adjust the temperature of multiple battery cells. The heat exchange medium can be water, a mixture of water and ethylene glycol, or air. Alternatively, the heat exchange medium can be a phase change material. The phase change material changes from liquid to gas to absorb a large amount of latent heat, thereby realizing the cooling function of the battery cell. However, the phase change material cannot circulate quickly during the process of absorbing and releasing heat, which affects the regulation effect of the battery temperature and thus affects the reliability of the battery device.

[0061] Based on the above considerations, in order to improve the reliability of the battery device, an embodiment of the present application provides a battery device, including a battery cell assembly and a thermal management assembly; the battery cell assembly includes a plurality of battery cells; the thermal management assembly is arranged on one side of the battery cell assembly in a first direction, the thermal management assembly includes a heat pipe and a heat exchange element, the heat pipe includes a heat pipe cavity, a capillary structure and a phase change material, the capillary structure and the phase change material are arranged inside the heat pipe cavity, and the heat exchange element has a flow channel for accommodating a heat exchange medium; at least one end of the heat pipe cavity is connected to the heat exchange element, and the internal space of the heat pipe cavity is independent of the flow channel; wherein the heat pipe is thermally connected to the battery cell, and the heat pipe is used to transfer the heat of the battery cell to the heat exchange element.

[0062] In a battery device of this structure, a capillary structure and a phase change material are provided in the cavity of the temperature-averaging portion. The phase change material can be rapidly vaporized after being heated so as to move toward the heat exchange portion with higher efficiency in the cavity of the temperature-averaging portion, thereby allowing the heat to diffuse rapidly and transfer the heat to the heat exchange portion. A flow channel for conducting a heat exchange medium is provided inside the heat exchange portion, so that the vaporized phase change material can be rapidly liquefied after heat exchange with the heat exchange medium, and can move toward a battery cell with high temperature with higher efficiency in cooperation with the capillary structure, so that the phase change material can circulate and move with higher efficiency in the cavity of the temperature-averaging portion, forming a hot and cold cycle, reducing the risk of heat concentration in the battery cell thermally connected to the temperature-averaging portion, and thus improving the reliability of the battery device.

[0063] The technical solutions described in the embodiments of the present application are applicable to battery devices and electrical devices using the battery devices.

[0064] The electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0065] Please refer to Figure 1 , Figure 1A schematic diagram of the structure 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, and 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, and 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 be used as an operating power source or a power source for the vehicle 1000, etc. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to power the motor 300, for example, for the starting, navigation and working power requirements of the vehicle 1000 during driving.

[0066] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source or a usage power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0067] In order to meet different power usage requirements, the battery device 100 may include a plurality of battery cells 21, wherein the plurality of battery cells 21 may be connected in series, in parallel, or in a hybrid connection, wherein the hybrid connection refers to a mixture of series and parallel connections. The battery device 100 may also be referred to as a battery pack. Optionally, a plurality of battery cells 21 may first be connected in series, in parallel, or in a hybrid connection to form a battery cell assembly 20, and a plurality of battery cell assemblies 20 may then be connected in series, in parallel, or in a hybrid connection to form a battery device 100. In other words, a plurality of battery cells 21 may directly form a battery device 100, or may first form a battery cell assembly 20, and the battery cell assembly 20 may then form a battery device 100.

[0068] For example, see Figure 2 , Figure 2 The structure of the battery device 100 of some embodiments of the present application is an exploded view. The battery device 100 may include a plurality of battery cells 21. The battery device 100 may also include a box body 10. The box body 10 is a hollow structure inside, and the plurality of battery cells 21 are accommodated in the box body 10.

[0069] Optionally, the battery device 100 may also include other structures, which are not described one by one here. For example, the battery device 100 may also include a busbar component, which is used to realize electrical connection between multiple battery cells 21, such as parallel connection, series connection, or mixed connection. Specifically, the busbar component can realize electrical connection between the battery cells 21 by connecting the electrode terminals of the battery cells 21. Furthermore, the busbar component can be fixed to the electrode terminals of the battery cells 21 by welding. The electrical energy of multiple battery cells 21 can be further led out through the conductive mechanism through the box body 10.

[0070] According to different power requirements, the number of battery cells 21 can be set to any value. Multiple battery cells 21 can be connected in series, parallel or mixed to achieve a larger capacity or power. Since the number of battery cells 21 included in each battery device 100 may be large, for ease of installation, the battery cells 21 can be grouped, and each group of battery cells 21 constitutes a battery cell assembly 20. The number of battery cells 21 included in the battery cell assembly 20 is not limited and can be set according to demand. The battery device 100 may include multiple battery cell assemblies 20, which can be connected in series, parallel or mixed.

[0071] Please refer to Figure 3-Figure 5 , Figure 3 This is an exploded view of another battery device 100 provided in some embodiments of the present application. Figure 4 This is a schematic diagram of the structure of a first thermal management component 30 provided in some embodiments of the present application. Figure 5 for Figure 4 The embodiment of the present application provides a battery device 100, including a battery cell assembly 20 and a thermal management assembly 30; the battery cell assembly 20 includes a plurality of battery cells 21; the thermal management assembly 30 is arranged on one side of the battery cell assembly 20 in the first direction Z, the thermal management assembly 30 includes a heat pipe 31 and a heat exchanger 32, the heat pipe 31 includes a heat pipe cavity 311, a capillary structure 31B and a phase change material, the capillary structure 31B and the phase change material are arranged inside the heat pipe cavity 311, and the heat exchanger 32 has a flow channel for accommodating a heat exchange medium inside; at least one end of the heat pipe cavity 311 is connected to the heat exchanger 32, and the internal space of the heat pipe cavity 311 is independent of the flow channel; wherein the heat pipe 31 is thermally connected to the battery cell 21, and the heat pipe 31 is used to transfer the heat of the battery cell 21 to the heat exchanger 32.

[0072] In some embodiments, the battery cell assembly 20 includes a plurality of battery cells 21 .

[0073] The heat pipe 31 and the heat exchange element 32 are separate structures. The heat pipe 31 and the heat exchange element 32 can be directly connected, or the heat pipe 31 and the heat exchange element 32 can also be indirectly connected through a heat conductive element.

[0074] The thermal management component 30 is a component in the battery device 100 for regulating the temperature of the battery cells 21 .

[0075] The first direction Z is the arrangement direction of the thermal management assembly 30 and the battery cells 21 . The first direction Z may be the gravity direction, or the first direction Z may also be the horizontal direction.

[0076] Exemplarily, the heat pipe 31 and the heat exchange element 32 may be connected in a non-detachable manner, or may be connected in a detachable manner, or may be in abutment with each other.

[0077] The heat pipe cavity 311 is a shell-shaped structural member. Exemplarily, a cavity 31A may be formed in the heat pipe cavity 311 , and the cavity 31A is used to accommodate the capillary structure 31B and the phase change material.

[0078] In some embodiments, the material of the heat pipe cavity 311 may be metal, for example, it may include but is not limited to aluminum, aluminum alloy, copper, magnesium alloy, steel, etc.

[0079] In some embodiments, the heat pipe cavity 311 may be made of plastic.

[0080] In some embodiments, the cavity 31A may be in a vacuum state.

[0081] In some embodiments, the capillary structure 31B may be a porous core material disposed on the wall of the cavity 31A.

[0082] It can be understood that the capillary structure 31B needs to have a certain number of capillary pores 31C, and the capillary can provide a certain capillary force to drive the liquid phase change material to flow.

[0083] The capillary structure 31B can be made of a capillary porous material and a material with low thermal resistance and high permeability.

[0084] In some embodiments, the capillary structure 31B may be filled with foam, so that the capillary structure 31B has good process repeatability and reliability, simple manufacturing process and low manufacturing cost.

[0085] In some embodiments, the capillary structure 31B may be a convex portion or a concave portion etched on the wall of the cavity 31A.

[0086] In some embodiments, the capillary structure 31B may be a mesh structure disposed on the wall of the cavity 31A.

[0087] The phase change material includes at least one of tetrafluoroethane, difluoromethane, pentafluoroethane, propane, and carbon dioxide, which can be referred to as gas-liquid phase change materials.

[0088] The interior of the heat pipe cavity 311 is evacuated to a negative pressure state and filled with a suitable liquid medium, which can fill the capillary structure 31B of the entire heat pipe cavity 311. In this way, the heat pipe cavity 311 can utilize the liquid medium to be vaporized at the heat-conducting connection with the battery cell 21 and then liquefied after heat exchange with the heat exchange medium in the heat exchange element 32, so that heat can be quickly transferred from the battery cell 21 to the heat exchange element 32.

[0089] In some embodiments, the heat exchange element 32 may be made of metal, for example, it may include but is not limited to aluminum, aluminum alloy, copper, magnesium alloy, steel, etc.

[0090] The heat pipe 31 and the heat exchange element 32 can be made of the same material, or the heat pipe 31 and the heat exchange element 32 can also be made of different materials. For example, the heat pipe 31 and the heat exchange element 32 can both be made of metal materials, or one of the heat pipe 31 and the heat exchange element 32 can be made of plastic and the other can be made of metal.

[0091] In some embodiments, the heat exchange element 32 has a flow channel inside, and the flow channel is used to accommodate a heat exchange medium to adjust the temperature of the battery cell 21 and the high-voltage heat source.

[0092] The heat exchange element 32 may also be referred to as a cooling component, a cooling system or a cooling plate, etc., and the heat exchange medium contained therein may also be referred to as a cooling medium or a cooling fluid, more specifically, a cooling liquid or a cooling gas. Optionally, the heat exchange medium may be water, a mixture of water and ethylene glycol, or air, etc.

[0093] In some embodiments, the heat exchange element 32 may be a water cooling plate, which can cool the phase change material in the heat pipe 31 by passing water with a relatively low temperature.

[0094] In some embodiments, the heat exchange element 32 may be a rolled element.

[0095] In some embodiments, the heat exchange element 32 may be a tube.

[0096] In some embodiments, the battery device 100 also includes a battery management system, which is used to receive temperature data of the battery cell 21 and control the flow rate of the heat exchange medium in the heat exchange element 32 based on the temperature data, thereby adjusting the cooling rate of the gas phase change material in the heat pipe 31, and then adjusting the heat exchange rate between the heat pipe 31 and the battery cell 21, thereby adjusting the temperature of the battery cell.

[0097] Specifically, when the battery cell 21 of the battery cell assembly 20 generates heat due to charging and discharging, the phase change material in the part corresponding to the battery cell 21 in the cavity 31A absorbs heat and vaporizes, so that the pressure in the cavity 31A increases, and the gas phase phase change material moves toward the heat exchanger 32, and exchanges heat with the heat exchange medium in the flow channel through the heat exchanger 32, so as to liquefy to generate liquid phase phase change material. Then, under the capillary force of the capillary structure 31B, it returns to the part corresponding to the battery cell 21 in the cavity 31A, and the cycle continues until the temperature of each part of the temperature equalization part is equal. This cycle process is carried out quickly, and the heat can be continuously conducted to achieve the cooling function of the battery cell 21.

[0098] In some embodiments, the battery device 100 further includes a box 10, the box 10 has a receiving cavity for accommodating the battery cell assembly 20, and the thermal management component 30 is a part of the box 10. As shown in the figure, they are respectively referred to as the first box body 11 and the second box body 12, and the first box body 11 and the second box body 12 are buckled together. The shape of the first box body 11 and the second box body 12 can be determined according to the shape of the combination of multiple battery cells 21, and the first box body 11 and the second box body 12 can both have an open surface. For example, the first box body 11 and the second box body 12 can both be hollow cuboids and each has only one face as an open face, the open face of the first box body 11 and the open face of the second box body 12 are arranged oppositely, and the first box body 11 and the second box body 12 are buckled together to form a box 10 with a closed chamber. After the multiple battery cells 21 are connected in parallel, in series or in a mixed combination, they are placed in the box 10 formed after the first box body 11 and the second box body 12 are buckled. The thermal management component 30 can be a part of the first box body 11 and the second box body 12. The housing 10 has a receiving cavity for accommodating the battery cell assembly 20, thereby providing the battery cell assembly 20 with a stable working environment, thereby improving the reliability of the battery device 100. Meanwhile, the thermal management assembly 30 is a part of the housing 10, which improves the integrity of the thermal management assembly 30 and other structural components of the battery device 100.

[0099] In some embodiments, please refer to Figure 2 In some embodiments, the box body 10 includes a first box body 11 and a second box body 12, one side of the first box body 11 is an open surface, the first box body 11 includes a frame 112 and a bottom plate 111, the frame 112 is arranged around the bottom plate 111 to form the first box body 11 together with the bottom plate 111, the frame 112 forms an opening at one end away from the bottom plate 111, and the second box body 12 is a cover 121. The bottom plate 111 is used to carry the battery monomer assembly 20, wherein the thermal management assembly 30 is the bottom plate 111.

[0100] In this embodiment, a capillary structure 31B and a phase change material are provided in the cavity 31A of the temperature-averaging portion. The phase change material can be rapidly vaporized after being heated so as to move to the heat exchange portion with higher efficiency in the cavity 31A of the temperature-averaging portion, thereby allowing the heat to diffuse rapidly and transfer the heat to the heat exchange portion. A flow channel for conducting a heat exchange medium is provided inside the heat exchange portion, so that the vaporized phase change material can be rapidly liquefied after heat exchange with the heat exchange medium, and can move to the battery cell 21 with high temperature with higher efficiency in cooperation with the capillary structure 31B, so that the phase change material circulates and moves with higher efficiency in the cavity 31A of the temperature-averaging portion, forming a hot and cold cycle, thereby reducing the risk of heat concentration in the battery cell 21 thermally conductively connected to the temperature-averaging portion, thereby improving the reliability of the battery device 100.

[0101] Please refer to Figure 4 , and please refer to Figure 6 and Figure 7 , Figure 6 and Figure 7 Schematic diagram of the structures of two thermal management components 30 provided in some embodiments of the present application. According to some embodiments of the present application, on a plane perpendicular to the first direction Z, the orthographic projection of the battery cell 21 and the orthographic projection of the heat pipe 31 at least partially overlap.

[0102] On a plane perpendicular to the first direction Z, the orthographic projection of the battery cell 21 at least partially overlaps with the orthographic projection of the heat pipe 31. The orthographic projection of the battery cell 21 on the plane perpendicular to the first direction Z may completely overlap with the orthographic projection of the heat pipe 31, or the orthographic projection of the battery cell 21 on the plane perpendicular to the first direction Z may partially overlap with the orthographic projection of the heat pipe 31.

[0103] It should be noted that, in order to facilitate the display of the orthographic projection range of the battery cell 21, please refer to Figure 4 , and please refer to Figure 6 and Figure 7 In the figure, the range of the orthographic projection of the battery cell 21 is marked by a dotted line. It should be noted that the dotted line is only for the convenience of showing the range of the orthographic projection of the battery cell 21 and does not represent any entity meaning.

[0104] In this embodiment, on a plane perpendicular to the first direction Z, the orthographic projection of the battery cell 21 at least partially overlaps with the orthographic projection of the heat pipe 31, making it easier for the heat pipe 31 to directly contact the battery cell 21 or indirectly contact it through a heat-conducting structure, thereby facilitating heat exchange between the heat pipe 31 and the battery cell 21.

[0105] According to some embodiments of the present application, the heat exchange element 32 is provided with a medium inlet and a medium outlet communicated with the flow channel.

[0106] The medium inlet is a structure for the heat exchange medium to flow into the flow channel. Exemplarily, the cut-off inlet may be a hole or an opening. The medium outlet is a structure for the heat exchange medium to flow out of the flow channel. Exemplarily, the cut-off outlet may be a hole or an opening.

[0107] In this embodiment, a medium inlet and a medium outlet are provided for the heat exchange medium to flow into and out of the flow channel, so that the heat exchange medium in the flow channel is exchanged with the outside, so that the temperature of the heat exchange medium in the flow channel is kept at a lower state, so as to increase the liquefaction rate of the gasified phase change material. This reduces the risk of heat concentration in the battery cell 21 that is thermally connected to the temperature equalizing portion, thereby improving the reliability of the battery device 100.

[0108] Please refer to Figure 4 , and please refer to Figure 6 and Figure 7 According to some embodiments of the present application, a cross section of the flow channel perpendicular to the first direction Z is annular.

[0109] It can be understood that when the heat exchange medium moves along the annular flow channel, the inertia of the heat exchange medium will generate centrifugal force, resulting in the formation of a velocity gradient at the corner of the heat exchange medium flow channel: the upper layer with a fast flow rate has a tendency to move laterally to the outer peripheral surface of the flow channel, and the lower layer with a slow flow rate has a tendency to move laterally to the inner peripheral surface of the flow channel. The above two trends are loaded on the main flow direction of the heat exchange medium, causing the heat exchange medium to flow in a spiral shape.

[0110] In some embodiments, the flow channel includes a first flow segment, a second flow segment, a third flow segment and a fourth flow segment connected end to end, the first flow segment and the third flow segment are arranged at intervals along the second direction X, the second flow segment and the fourth flow segment are arranged at intervals along the third direction Y, the medium inlet and the medium outlet of the heat exchange medium can be located in the same flow segment, and can also be located in two flow segments arranged oppositely along the second direction X or along the third direction Y, and the first direction Z, the second direction X and the third direction are perpendicular to each other.

[0111] In an embodiment where the medium inlet and the medium outlet of the heat exchange medium are located in the same flow segment, the flow segment is provided with a blocking member to separate the opposite ends of the flow segment, and the medium inlet and the medium outlet of the heat exchange medium are respectively located on opposite sides of the blocking member.

[0112] In this embodiment, the cross-section of the flow channel perpendicular to the first direction Z is annular, so that when the heat exchange medium flows along the flow channel, it is easier to flow in a spiral shape in the annular flow channel due to the action of centrifugal force, which facilitates heat exchange between the heat exchange media and makes the temperature of the heat exchange medium rise evenly, so that the heat transferred from the uniform temperature portion can be absorbed more evenly, thereby improving the heat exchange efficiency of the uniform temperature portion and the heat exchange portion, and further improving the reliability of the battery device 100.

[0113] Please refer to Figure 4 , and please refer to Figure 6 and Figure 7 According to some embodiments of the present application, the heat exchange element 32 is a heat exchange tube 321 .

[0114] The heat exchange tube 321 is a tubular structure with a flow channel disposed inside.

[0115] In some embodiments, in some embodiments, the heat exchange tube 321 is annular, and the heat pipes 31 are located outside the heat exchange tube 321 and are arranged at intervals along the outer circumference of the heat exchange tube 321 .

[0116] In some embodiments, the heat exchange tube 321 is annular, and the heat pipes 31 are located inside the heat exchange tube 321 and are arranged at intervals along the inner circumference of the heat exchange tube 321 .

[0117] In some embodiments, one end of the heat pipe cavity 311 is connected to the heat exchange tube 321, and the other end extends in a direction away from the heat exchange tube 321. In other embodiments, both ends of the heat pipe cavity 311 are connected to the heat exchange tube 321.

[0118] In some embodiments, the heat exchange tube 321 has two first tube segments 321A spaced apart in the third direction Y, and the heat exchange tube 321 has two second tube segments 321B spaced apart in the second direction X. The heat exchange tube 321 also has a transition segment 321C connecting adjacent first tube segments 321A and second tube segments 321B, wherein the first flow segment and the third flow segment are respectively disposed in the two first tube segments 321A, and the second flow segment and the fourth flow segment are respectively disposed in the two second tube segments 321B.

[0119] In this embodiment, the heat exchange member 32 is a heat exchange tube 321 , that is, the two components in the thermal management assembly 30 are formed separately, which facilitates the manufacture and assembly of the temperature equalizing part, reduces the manufacturing difficulty of the thermal management assembly 30 , and thus reduces the manufacturing cost of the battery device 100 .

[0120] Please refer to Figure 4 and Figure 6 According to some embodiments of the present application, the heat exchange tube 321 is arranged around the multiple heat pipes 31, and both ends of the heat pipe 31 are connected to the heat exchange tube 321.

[0121] In some embodiments, the heat exchange tube 321 has two first tube segments 321A spaced apart in the third direction Y, the heat exchange tube 321 has two second tube segments 321B spaced apart in the second direction X, the heat exchange tube 321 also has a transition segment 321C connecting adjacent first tube segments 321A and second tube segments 321B, the heat pipe cavity 311 has a first end 311A ​​and a second end 311B oppositely disposed in the third direction Y, the first end 311A ​​is connected to one of the two first tube segments 321A, and the second end 311B is connected to the other of the two first tube segments 321A.

[0122] Exemplarily, the extension direction of the first pipe segment 321A is parallel to the second direction X, and the extension direction of the second pipe segment 321B is parallel to the third direction Y. The sum of the dimensions of the second pipe segment 321B in the third direction Y and the dimensions of the transition pipe segments at both ends of the second pipe segment 321B oppositely disposed in the third direction Y in the third direction Y should be greater than the dimension of the heat pipe 31 in the third direction Y.

[0123] In this embodiment, by setting the number of heat pipes 31 to be multiple, the area covered by the heat pipes 31 is increased, so that the heat pipes 31 can cover multiple battery cells 21 in the battery assembly, reduce the risk of heat concentration in the battery cells 21, and thus improve the reliability of the battery device 100. At the same time, the heat exchange tube 321 is arranged around the heat pipe 31, thereby increasing the area of ​​the heat pipe 31 that can be used for heat exchange by the heat exchange tube 321, improving the heat exchange efficiency, and thus improving the reliability of the battery device 100; and both ends of the heat pipe 31 are connected to the heat exchange tube 321, which reduces the size of the cavity 31A that the phase change material in a part of the heat pipe 31 needs to flow through when it moves to the heat exchange tube 321 after vaporization, so that the phase change material circulates and moves in the cavity 31A of the uniform temperature portion with higher efficiency, forming a cold and hot cycle, reducing the risk of heat concentration in the battery cells 21 thermally connected to the uniform temperature portion, thereby improving the reliability of the battery device 100.

[0124] Please refer to Figure 4 and Figure 6 According to some embodiments of the present application, a plurality of heat pipes 31 are arranged at intervals along the second direction X, and the heat pipes 31 extend along the third direction Y. The first direction Z, the second direction X, and the third direction Y are perpendicular to each other.

[0125] The second direction X and the third direction Y are two directions perpendicular to the first direction Z in pairs.

[0126] For example, the second direction X may be the width direction of the box 10 , and the third direction Y may be the length direction of the box 10 ; or, the second direction X may be the length direction of the box 10 , and the third direction Y may be the width direction of the box 10 .

[0127] In this embodiment, a plurality of heat exchange tubes 321 are arranged along the second direction X, which reduces the manufacturing difficulty of the thermal management component 30 and helps to improve the process repeatability of the thermal management component 30 .

[0128] Please refer to Figure 6 According to some embodiments of the present application, a plurality of heat exchange tubes 321 are provided, and the plurality of heat exchange tubes 321 are arranged along the second direction X, and a plurality of heat pipes 31 are provided in each heat exchange tube 321 .

[0129] In some embodiments, a plurality of heat exchange tubes 321 are provided, and each heat exchange tube 321 is provided with a plurality of heat pipes 31 , and on a plane perpendicular to the first direction Z, the orthographic projections of the plurality of heat exchange tubes 321 do not overlap each other, that is, the plurality of heat exchange tubes 321 do not intersect.

[0130] In some embodiments, the heat exchange tube 321 has two first tube segments 321A spaced apart in the third direction Y, and the heat exchange tube 321 has two second tube segments 321B spaced apart in the second direction X. The extension direction of the first tube segment 321A is parallel to the second direction X, and the extension direction of the second tube segment 321B is parallel to the third direction Y.

[0131] It can be understood that when the size of the thermal management component 30 in the third direction Y is constant, the heat exchange tube 321 includes a plurality of heat exchange tubes 321 arranged along the third direction Y. Compared with the situation where one heat exchange tube 321 is arranged around all the sub-heat pipes 31, the size of the second pipe section 321B of the single heat exchange tube 321 is reduced, thereby reducing the size of the flow channel in the single heat exchange tube 321 and reducing the flow resistance of the flow channel.

[0132] In some embodiments, multiple battery cells 21 are arranged along a third direction Y, and the multiple battery cells 21 include a first battery cell 21A, a second battery cell 21B and a third battery cell 21C. Along the third direction Y, the second battery cell 21B is located between the first battery cell 21A and the third battery cell 21C; on a plane perpendicular to the first direction Z, the orthographic projection of the first battery cell 21A overlaps with the orthographic projection of the heat pipe 31 in one of the two adjacent heat exchange tubes 321, the orthographic projection of the third battery cell 21C overlaps with the orthographic projection of the heat pipe 31 in the other of the two adjacent heat exchange tubes 321, and the orthographic projection of the second battery cell 21B overlaps with the orthographic projection of at least one of the two first tube sections 321A adjacent to each other in the adjacent heat exchange tube 321 along the third direction Y.

[0133] To show the range of the orthographic projection of the first battery cell 21A, the second battery cell 21B and the third battery cell 21C, please refer to Figure 6 , Figure 6 The range of the first battery cell 21A, the second battery cell 21B and the third battery cell 21C is shown in a dotted line manner. It should be noted that Figure 6 The dotted lines in are used only to indicate the ranges of the first battery cell 21A, the second battery cell 21B, and the third battery cell 21C. The dotted lines themselves do not have other meanings.

[0134] In some embodiments, along the third direction Y, a battery cell 21 is disposed on a side of the first battery cell 21A away from the second battery cell 21B, and / or a battery cell 21 is disposed between the first battery cell 21A and the second battery cell 21B. Along the third direction Y, a battery cell 21 is disposed on a side of the third battery cell 21C away from the second battery cell 21B, and / or a battery cell 21 is disposed between the third battery cell 21C and the second battery cell 21B.

[0135] It can be understood that along the third direction Y, the second battery cell 21B is located between the first battery cell 21A and the third battery cell 21C, so that the second battery cell 21B, while generating heat itself, also receives heat from the adjacent first battery cell 21A and third battery cell 21C, so that heat concentration is likely to occur at the second battery cell 21B. By overlapping the orthographic projection of the second battery cell 21B with the orthographic projection of at least two sub-heat exchange tubes 321 on a plane perpendicular to the first direction Z, the second battery cell 21B can exchange heat with the refrigerant in at least two sub-heat exchange tubes 321, so that the second battery cell 21B can reduce its temperature faster, thereby reducing the risk of heat concentration at the second battery cell 21B, thereby improving the reliability of the battery device 100.

[0136] In this embodiment, multiple heat exchange tubes 321 are provided and multiple heat pipes 31 are provided in each heat exchange tube 321, so that the number of heat pipes 31 required for heat exchange by a single heat exchange tube 321 is reduced. At the same time, compared with the situation where one heat exchange tube 321 is arranged around all the heat pipes 31, the length of the flow channel of the single heat exchange tube 321 is reduced, and the slow flow rate of the heat exchange medium caused by the long flow channel is reduced, thereby improving the heat exchange efficiency. At the same time, the total length of the heat exchange tube 321 is increased, and the area of ​​the heat exchange tube 321 that can exchange heat with the heat pipe 31 is increased, thereby reducing the risk of heat concentration in the battery cell 21 that is thermally conductively connected to the temperature equalizing portion, thereby improving the reliability of the battery device 100.

[0137] Please refer to Figure 7 According to some embodiments of the present application, multiple heat pipes 31 are arranged into two groups along the third direction Y, the heat exchange pipe 321 is located between the two groups of heat pipes 31, and the multiple heat pipes 31 in each group of heat pipes 31 are arranged along the second direction X, and the first direction Z, the second direction X and the third direction Y are perpendicular to each other.

[0138] Since the heat exchange tube 321 is annular, the outer circumference of the heat exchange tube 321 is larger than the inner circumference of the heat exchange tube 321. The heat pipe 31 is connected to the outer circumference of the heat exchange tube 321, so that the heat exchange tube 321 can have a larger area due to the connection with the heat pipe 31, thereby allowing the heat exchange tube 321 to be connected to more heat pipes 31.

[0139] In some embodiments, the heat exchange tube 321 has two first tube segments 321A spaced apart in the third direction Y, and the heat exchange tube 321 has two second tube segments 321B spaced apart in the second direction X. The extension direction of the first tube segment 321A is parallel to the second direction X, and one end of the heat pipe 31 in the third direction Y is connected to one of the two first tube segments 321A. It can be understood that since the heat pipe 31 is located outside the heat exchange tube 321, that is, the length of the second tube segment 321B can be reduced as much as possible, so that the first tube segment 321A can be extended as much as possible when the length of the heat exchange tube 321 remains unchanged, so that the first tube segment 321A can have more area for connection with the heat pipe 31.

[0140] In some embodiments, multiple battery cells 21 are arranged along a third direction Y, and the multiple battery cells 21 include a first battery cell 21A, a second battery cell 21B and a third battery cell 21C. Along the third direction Y, the second battery cell 21B is located between the first battery cell 21A and the third battery cell 21C; on a plane perpendicular to the first direction Z, the orthographic projection of the first battery cell 21A overlaps with the orthographic projection of a group of heat pipes 31, the orthographic projection of the third battery cell 21C overlaps with the orthographic projection of another group of heat pipes 31, and the orthographic projection of the second battery cell 21B overlaps with the orthographic projection of the heat exchange tube 321.

[0141] To show the range of the orthographic projection of the first battery cell 21A, the second battery cell 21B and the third battery cell 21C, please refer to Figure 7 , Figure 7 The range of the first battery cell 21A, the second battery cell 21B and the third battery cell 21C is shown in a dotted line manner. It should be noted that Figure 7 The dotted lines in are used only to indicate the ranges of the first battery cell 21A, the second battery cell 21B, and the third battery cell 21C. The dotted lines themselves do not have other meanings.

[0142] It can be understood that along the third direction Y, the second battery cell 21B is located between the first battery cell 21A and the third battery cell 21C, so that the second battery cell 21B, while generating heat itself, also receives heat from the adjacent first battery cell 21A and third battery cell 21C, so that heat concentration is likely to occur at the second battery cell 21B. By overlapping the orthographic projection of the second battery cell 21B with the orthographic projection to the heat exchange tube 321 on a plane perpendicular to the first direction Z, the second battery cell 21B can exchange heat with the refrigerant in at least two sub-heat exchange tubes 321, so that the second battery cell 21B can reduce its temperature faster, thereby reducing the risk of heat concentration at the second battery cell 21B, thereby improving the reliability of the battery device 100.

[0143] In this embodiment, the heat exchange tube 321 is located between the two groups of heat pipes 31 to fully utilize the two tube sections of the heat exchange tube 321 that are relatively arranged in the third direction Y, so that the heat exchange tube 321 can be connected to more heat pipes 31 to receive more heat from the battery cells 21 transferred by the heat pipes 31, thereby reducing the risk of heat concentration in a larger range of battery cells 21, thereby improving the reliability of the battery device 100.

[0144] Please refer to Figure 8 , Figure 8 The fourth thermal management assembly 30 provided in some embodiments of the present application is intended to be a structure explosion. According to some embodiments of the present application, the thermal management assembly 30 further includes a support plate 34, the support plate 34 is used to support the battery cell assembly 20 along the first direction Z, and the heat pipe 31 and the heat exchange member 32 are arranged on a side of the support plate 34 away from the battery cell assembly 20 along the first direction Z.

[0145] The support plate 34 is a plate-shaped structural member used to support the battery cell assembly 20 along the first direction Z.

[0146] It can be understood that the thickness direction of the support plate 34 is parallel to the first direction Z.

[0147] In this embodiment, the heat pipe 31 and the heat exchange element 32 are arranged on the side of the support plate 34 away from the battery cell assembly 20. Therefore, when the heat pipe 31 and the heat exchange element 32 leak, the heat exchange medium and the phase change material can be isolated by the support plate 34, thereby reducing the risk of the heat exchange medium phase change material causing an internal short circuit in the battery cell 21, thereby improving the reliability of the battery device 100.

[0148] Please refer to Figure 8 According to some embodiments of the present application, the thermal management component 30 further includes a joint 341 , which is disposed on a side of the support plate 34 away from the heat exchange element 32 along the first direction Z, and the joint 341 is connected to the heat exchange element 32 .

[0149] In some embodiments, the connector 341 includes a liquid inlet connector 341 and a liquid outlet connector 341 , the liquid inlet connector 341 is connected to the medium inlet, and the liquid outlet connector 341 is connected to the medium outlet.

[0150] In this embodiment, a joint 341 is provided on the side of the support plate 34 away from the heat exchange tube 321 , and the heat exchange medium flows into and out of the flow channel through the joint 341 , so the structure is simple and easy to implement.

[0151] According to some embodiments of the present application, the heat pipe 31 and the heat exchange element 32 are welded or bonded.

[0152] Welding refers to locally melting the contact surface between the heat pipe cavity 311 and the heat exchange element 32 through high temperature, high pressure or a combination of both, or locally melting the contact surface between the heat pipe cavity 311, the heat exchange element 32 and the filling material (such as welding wire and welding rod) through high temperature, high pressure or a combination of both.

[0153] Through the chemical action of an adhesive (glue, epoxy resin, etc.), an intermolecular force or mechanical interlocking is formed on the contact surface between the heat pipe cavity 311 and the heat exchange element 32 to achieve connection.

[0154] Exemplarily, the adhesive may be a thermally conductive adhesive.

[0155] In this embodiment, the heat pipe 31 and the heat exchange element 32 are welded or bonded. On the one hand, welding or bonding can make the heat pipe 31 and the heat exchange element 32 connected more tightly, thereby facilitating heat exchange between the heat pipe 31 and the heat exchange element 32, improving the heat exchange efficiency between the heat pipe 31 and the heat exchange element 32, and thus improving the reliability of the battery device 100; on the other hand, the structural strength of the connection between the heat pipe 31 and the heat exchange element 32 is improved, thereby improving the reliability of the thermal management component 30.

[0156] Please refer to Figure 4 and Figure 5 According to some embodiments of the present application, the embodiments of the present application further provide a thermal management component 30, including: a heat pipe 31 and a heat exchanger 32; the heat pipe 31 includes a heat pipe cavity 311, a capillary structure 31B and a phase change material, and the capillary structure 31B and the phase change material are arranged inside the heat pipe cavity 311; the heat exchanger 32 has a flow channel for accommodating a heat exchange medium inside; at least one end of the heat pipe cavity 311 is connected to the heat exchanger 32, and the internal space of the heat pipe cavity 311 and the flow channel are independent of each other.

[0157] 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 schemes, and the battery device 100 is used to provide electrical energy to the electrical device.

[0158] According to some embodiments of the present application, referring to Figures 2 to 8The embodiment of the present application provides a battery device 100, comprising a battery cell 21 group and a thermal management component 30; the battery cell component 20 comprises a plurality of battery cells 21; the thermal management component 30 is arranged on one side of the battery cell component 20 in the first direction Z, the thermal management component 30 comprises a heat pipe 31 and a heat exchanger 32, the heat pipe 31 comprises a heat pipe cavity 311, a capillary structure 31B and a phase change material, the capillary structure 31B and the phase change material are arranged inside the heat pipe cavity 311, and the heat exchanger 32 has a flow channel for accommodating a heat exchange medium inside; at least one end of the heat pipe cavity 311 is connected to the heat exchanger 32, and the internal space of the heat pipe cavity 311 is independent of the flow channel; wherein the heat pipe 31 is thermally connected to the battery cell 21, and the heat pipe 31 is used to transfer the heat of the battery cell 21 to the heat exchanger 32. On a plane perpendicular to the first direction Z, the orthographic projection of the battery cell 21 and the orthographic projection of the heat pipe 31 at least partially overlap. The heat exchange element 32 is provided with a medium inlet and a medium outlet communicated with the flow channel. The cross section of the flow channel perpendicular to the first direction Z is annular. The heat exchange element 32 is a heat exchange tube 321 .

[0159] In some embodiments, the heat exchange pipe 321 is arranged around the plurality of heat pipes 31, and both ends of the heat pipe 31 are connected to the heat exchange pipe 321. The plurality of heat pipes 31 are arranged at intervals along the second direction X, and the heat pipes 31 extend along the third direction Y, and the first direction Z, the second direction X, and the third direction Y are perpendicular to each other. There are a plurality of heat exchange pipes 321, and the plurality of heat exchange pipes 321 are arranged along the second direction X, and a plurality of heat pipes 31 are arranged in each heat exchange pipe 321.

[0160] In some embodiments, multiple heat pipes 31 are arranged into two groups along the third direction Y, the heat exchange pipe 321 is located between the two groups of heat pipes 31, and the multiple heat pipes 31 in each group of heat pipes 31 are arranged along the second direction X. The first direction Z, the second direction X and the third direction Y are perpendicular to each other.

[0161] The thermal management assembly 30 further includes a support plate 34, which is used to support the battery cell assembly 20 along the first direction Z. The heat pipe 31 and the heat exchange element 32 are arranged on a side of the support plate 34 away from the battery cell assembly 20 along the first direction Z. The thermal management assembly 30 further includes a joint 341, which is arranged on a side of the support plate 34 away from the heat exchange element 32 along the first direction Z. The joint 341 is connected to the heat exchange element 32. The heat pipe 31 and the heat exchange element 32 are welded or bonded.

[0162] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0163] The above embodiments are only used to illustrate the technical solution of the present application and are not used to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery device, characterized in that: include: A battery cell assembly, comprising a plurality of battery cells; A thermal management component is arranged on one side of the battery cell assembly in the first direction, the thermal management component comprises a heat pipe and a heat exchange element, the heat pipe comprises a heat pipe cavity, a capillary structure and a phase change material, the capillary structure and the phase change material are arranged inside the heat pipe cavity, and the heat exchange element has a flow channel for accommodating a heat exchange medium; At least one end of the heat pipe cavity is connected to the heat exchange element, and the internal space of the heat pipe cavity is independent of the flow channel; Wherein, the heat pipe is thermally connected to the battery cell, and the heat pipe is used to transfer the heat of the battery cell to the heat exchange element.

2. The battery device according to claim 1, characterized in that On a plane perpendicular to the first direction, an orthographic projection of the battery cell at least partially overlaps with an orthographic projection of the heat pipe.

3. The battery device according to claim 1, characterized in that: The heat exchange element is provided with a medium inlet and a medium outlet communicated with the flow channel.

4. The battery device according to claim 1, wherein: The cross section of the flow channel perpendicular to the first direction is annular.

5. The battery device according to claim 4, characterized in that: The heat exchange element is a heat exchange tube.

6. The battery device according to claim 5, characterized in that The heat exchange tube is arranged around the plurality of heat pipes, and both ends of the heat pipes are connected to the heat exchange tubes.

7. The battery device according to claim 6, characterized in that: The plurality of heat pipes are spaced apart along the second direction, and the heat pipes extend along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

8. The battery device according to claim 7, characterized in that: A plurality of the heat exchange tubes are provided, and the plurality of the heat exchange tubes are arranged along the second direction, and a plurality of the heat pipes are provided in each of the heat exchange tubes.

9. The battery device according to claim 5, characterized in that: The multiple heat pipes are arranged into two groups along the third direction, the heat exchange pipe is located between the two groups of heat pipes, and the multiple heat pipes in each group of heat pipes are arranged along the second direction. The first direction, the second direction and the third direction are perpendicular to each other.

10. The battery device according to claim 1, wherein: The thermal management assembly further includes a support plate, which is used to support the battery cell assembly along the first direction. The heat pipe and the heat exchange element are arranged on a side of the support plate away from the battery cell assembly along the first direction.

11. The battery device according to claim 10, characterized in that: The thermal management component further includes a joint, which is disposed on a side of the support plate away from the heat exchange element along the first direction, and the joint is in communication with the heat exchange element.

12. The battery device according to claim 1, wherein: The heat pipe is welded or bonded to the heat exchange element.

13. A thermal management component, characterized in that: include: A heat pipe, comprising a heat pipe cavity, a capillary structure and a phase change material, wherein the capillary structure and the phase change material are arranged inside the heat pipe cavity; A heat exchange component having a flow channel for accommodating a heat exchange medium; At least one end of the heat pipe cavity is connected to the heat exchange element, and the inner space of the heat pipe cavity is independent of the flow channel.

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

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