Battery device and electric device

Abstract

The utility model is suitable for the technical field of batteries, and provides a battery device and a power utilization device. The heat exchange assembly is used for exchanging heat with the battery monomers, the heat exchange assembly comprises a base body, a flow channel is arranged in the base body, and the flow channel comprises an inlet section, a heat exchange section and an outlet section which are communicated in sequence; the sectional area of the outlet section is smaller than that of the inlet section in the direction perpendicular to the flowing path; in the battery device provided by the embodiment of the invention, the flow channel in the heat exchange assembly comprises the inlet section, the heat exchange section and the outlet section, so that the refrigerant can enter the heat exchange assembly through the inlet section and can be discharged to the heat exchange assembly through the outlet section; and the sectional area of the outlet section is smaller than that of the inlet section, so that the pressure of a refrigerant at the outlet section is increased through the inner wall of the flow channel, the pressure loss of the refrigerant in the flowing process is supplemented, the phase change of the refrigerant caused by the pressure loss is reduced, the temperature difference between the outlet section and the inlet section is reduced, and the temperature uniformity of the heat exchange assembly is improved.

Description

Technical Field

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

[0002] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0003] Battery devices usually control the internal temperature through direct cooling heat exchange components. In current heat exchange components, the flow of refrigerant in the heat exchange components easily causes changes in the refrigerant pressure, which in turn causes uneven temperature near the heat exchange components. Utility Model Content

[0004] In view of the above problems, the present application provides a battery device and an electrical device, which can alleviate the current uneven temperature of heat exchange components.

[0005] In a first aspect, an embodiment of the present application provides a battery device, comprising:

[0006] A battery cell; a heat exchange assembly for exchanging heat with the battery cell, the heat exchange assembly comprising a base, a flow channel being provided in the base to guide the refrigerant to flow along a set flow path, the flow channel comprising an inlet section, a heat exchange section and an outlet section which are connected in sequence, the inlet section being used for supplying the refrigerant to enter the heat exchange assembly, and the outlet section being used for supplying the refrigerant to be discharged outside the heat exchange assembly; in a direction perpendicular to the flow path, the cross-sectional area of ​​the outlet section is smaller than the cross-sectional area of ​​the inlet section.

[0007] In the technical solution of this embodiment, the flow channel in the heat exchange component includes an inlet section, a heat exchange section and an outlet section, so that the refrigerant can enter the heat exchange component through the inlet section, and the refrigerant can be discharged to the heat exchange component through the outlet section; the cross-sectional area of ​​the outlet section is made smaller than the cross-sectional area of ​​the inlet section, so as to increase the pressure of the refrigerant in the outlet section through the inner wall of the flow channel, compensate for the pressure loss of the refrigerant during the flow process, reduce the phase change of the refrigerant caused by the pressure loss, and reduce the temperature difference between the outlet section and the inlet section, thereby improving the temperature uniformity of the heat exchange component.

[0008] In some embodiments, in a direction perpendicular to the flow path, a cross-sectional height of the outlet segment is less than or equal to a cross-sectional height of the inlet segment.

[0009] The technical solution of this embodiment provides some specific structures in which the cross-sectional area of ​​the outlet section is smaller than the cross-sectional area of ​​the inlet section, so that the cross-sectional height of the outlet section is smaller than the cross-sectional height of the inlet section, so that the cross-sectional area of ​​the outlet section is smaller than the cross-sectional area of ​​the inlet section, reducing the pressure difference between the outlet section and the inlet section, thereby reducing the temperature difference between the outlet section and the inlet section.

[0010] In some embodiments, in a direction perpendicular to the flow path, a cross-sectional width of the outlet segment is less than or equal to a cross-sectional width of the inlet segment.

[0011] The technical solution of this embodiment provides a specific structure in which the cross-sectional area of ​​other outlet sections is smaller than the cross-sectional area of ​​the inlet section, so that the cross-sectional width of the outlet section is smaller than the cross-sectional width of the inlet section, so that the cross-sectional area of ​​the outlet section is smaller than the cross-sectional area of ​​the inlet section, reducing the pressure difference between the outlet section and the inlet section, thereby reducing the temperature difference between the outlet section and the inlet section.

[0012] In some embodiments, in a direction perpendicular to the flow path, the cross-sectional area of ​​the heat exchange section is smaller than the cross-sectional area of ​​the inlet section.

[0013] In the technical solution of this embodiment, the cross-sectional area of ​​the heat exchange section is also made smaller than the cross-sectional area of ​​the inlet section, so as to increase the pressure of the refrigerant in the heat exchange section through the inner wall of the flow channel, compensate for the pressure loss of the refrigerant during the flow process, reduce the phase change of the refrigerant caused by the pressure loss, and reduce the temperature difference between the heat exchange section and the inlet section, thereby improving the temperature uniformity of the heat exchange component.

[0014] In some embodiments, in a direction perpendicular to the flow path, a cross-sectional height of the heat exchange section is less than or equal to a cross-sectional height of the inlet section.

[0015] The technical solution of this embodiment provides some specific structures in which the cross-sectional area of ​​the heat exchange section is smaller than the cross-sectional area of ​​the inlet section, so that the cross-sectional height of the heat exchange section is smaller than the cross-sectional height of the inlet section, so that the cross-sectional area of ​​the heat exchange section is smaller than the cross-sectional area of ​​the inlet section, reducing the pressure difference between the heat exchange section and the inlet section, thereby reducing the temperature difference between the heat exchange section and the inlet section.

[0016] In some embodiments, in a direction perpendicular to the flow path, a cross-sectional width of the heat exchange section is less than or equal to a cross-sectional width of the inlet section.

[0017] The technical solution of this embodiment provides a specific structure in which the cross-sectional area of ​​other heat exchange sections is smaller than the cross-sectional area of ​​the inlet section, so that the cross-sectional width of the heat exchange section is smaller than the cross-sectional width of the inlet section, so that the cross-sectional area of ​​the heat exchange section is smaller than the cross-sectional area of ​​the inlet section, reducing the pressure difference between the heat exchange section and the inlet section, thereby reducing the temperature difference between the heat exchange section and the inlet section.

[0018] In some embodiments, in a direction perpendicular to the flow path, the cross-sectional area of ​​the heat exchange section is larger than the cross-sectional area of ​​the outlet section.

[0019] In the technical solution of this embodiment, the cross-sectional area of ​​the heat exchange section is made larger than the cross-sectional area of ​​the outlet section. Since the refrigerant first passes through the heat exchange section and then passes through the outlet section during the flow process, the pressure of the refrigerant in the outlet section is lower than the pressure of the refrigerant in the heat exchange section. Accordingly, it is necessary to make the cross-sectional area of ​​the outlet section smaller so that the inner wall of the outlet section can provide a greater pressure for the refrigerant to compensate for the pressure loss of the refrigerant, thereby reducing the pressure difference between the sections of the flow channel and improving the temperature uniformity of the heat exchange component.

[0020] In some embodiments, in a direction perpendicular to the flow path, a cross-sectional height of the heat exchange section is greater than or equal to a cross-sectional height of the outlet section.

[0021] The technical solution of this embodiment provides some specific structures in which the cross-sectional area of ​​the outlet section is smaller than the cross-sectional area of ​​the heat exchange section, so that the cross-sectional height of the outlet section is smaller than the cross-sectional height of the heat exchange section, so that the cross-sectional area of ​​the outlet section is smaller than the cross-sectional area of ​​the heat exchange section, reducing the pressure difference between the outlet section and the heat exchange section, thereby reducing the temperature difference between the outlet section and the heat exchange section.

[0022] In some embodiments, in a direction perpendicular to the flow path, a cross-sectional width of the heat exchange section is greater than or equal to a cross-sectional width of the outlet section.

[0023] The technical solution of this embodiment provides a specific structure in which the cross-sectional area of ​​other outlet sections is smaller than the cross-sectional area of ​​the heat exchange section, so that the cross-sectional width of the outlet section is smaller than the cross-sectional width of the heat exchange section, so that the cross-sectional area of ​​the outlet section is smaller than the cross-sectional area of ​​the heat exchange section, reducing the pressure difference between the outlet section and the heat exchange section, thereby reducing the temperature difference between the outlet section and the heat exchange section.

[0024] In some embodiments, along the flow path, the flow channel is gradually narrowed from the inlet section to the outlet section.

[0025] In the technical solution of this embodiment, the cross-sectional area of ​​the flow channel is gradually reduced from the inlet section, the heat exchange section to the outlet section. Since the refrigerant flows along the inlet section, the heat exchange section to the outlet section, and gradually loses pressure during the flow and undergoes a corresponding phase change, this setting can compensate for the pressure loss of the refrigerant through the gradually shrinking inner wall of the flow channel, so as to reduce the phase change of the refrigerant caused by the pressure loss, thereby improving the uniformity of the heat exchange component. At the same time, this setting can also make the interior of the flow channel smoother and less prone to a stepped structure, thereby reducing the risk of vortices and turbulence in the refrigerant in the flow channel.

[0026] In some embodiments, the base includes a first plate and a second plate. The first plate is provided with a flow channel. The second plate is connected to the first plate and covers the flow channel to form a flow channel.

[0027] The technical solution of this embodiment provides some specific structures of the base body, a flow channel groove is set on the first plate body, and the second plate body is covered with the flow channel groove to form a flow channel, so as to facilitate the processing and forming of the flow channel.

[0028] In some embodiments, a refrigerant flows in the flow channel, and the refrigerant is a gas-liquid phase change material or a solid-liquid phase change material.

[0029] The technical solution of this embodiment provides some specific types of refrigerants so that the refrigerants can absorb the heat generated by the operation of the battery cells through phase change.

[0030] In a second aspect, embodiments of the present application further provide an electrical device, including the battery device provided by some embodiments of the first aspect.

[0031] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0033] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0034] Figure 2 A schematic diagram of the exploded structure of a battery device provided in some embodiments of the present application;

[0035] Figure 3 A schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application;

[0036] Figure 4 A schematic diagram of the exploded structure of a heat exchange assembly provided in some embodiments of the present application;

[0037] Figure 5 A perspective schematic diagram of a heat exchange assembly provided for some embodiments of the present application;

[0038] Figure 6 A schematic cross-sectional view of an inlet section of a heat exchange assembly provided in some embodiments of the present application;

[0039] Figure 7 A schematic cross-sectional view of an outlet section of a heat exchange assembly provided in some embodiments of the present application;

[0040] Figure 8 A schematic cross-sectional view of an outlet section of a heat exchange assembly provided in some other embodiments of the present application;

[0041] Fig. 9 A schematic cross-sectional view of a heat exchange section in a heat exchange assembly provided in some embodiments of the present application;

[0042] Fig.10 A schematic cross-sectional view of a heat exchange section in a heat exchange assembly provided in some other embodiments of the present application;

[0043] Fig.11 A schematic top view of a first plate body in a heat exchange assembly provided in some embodiments of the present application.

[0044] The meanings of the marks in the figure are:

[0045] 1000. Vehicles;

[0046] 100. Battery device;

[0047] 10. Box body; 11. First box body; 12. Second box body;

[0048] 20. Battery cell; 21. Housing; 22. End cap; 23. Electrode assembly; 24. Electrode terminal;

[0049] 30. heat exchange component; 31. base; 311. first plate; 3111. flow channel; 312. second plate; 32. flow channel; 321. inlet section; 322. heat exchange section; 323. outlet section;

[0050] 200, motor;

[0051] 300. Controller. DETAILED DESCRIPTION

[0052] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein 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 figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0054] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0055] Reference to "embodiments" herein 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 herein may be combined with other embodiments.

[0056] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may 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 article generally indicates that the associated objects before and after are in an "or" relationship.

[0057] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0058] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0059] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0060] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0061] Battery devices usually control the internal temperature through direct cooling heat exchange components, where direct cooling refers to a temperature control method that uses the phase change of the refrigerant to absorb or release heat. Take the refrigerant as a gas-liquid phase change material as an example. The refrigerant can change from liquid to gas. During this process, the pressure of the refrigerant decreases and absorbs heat, resulting in a decrease in the temperature near the heat exchange component.

[0062] The refrigerant enters the heat exchange component from the inlet of the heat exchange component and flows in the heat exchange component, and is finally discharged from the outlet of the heat exchange component to the outside of the heat exchange component. During the flow of the refrigerant in the heat exchange component, it can absorb the temperature around the heat exchange component and undergo a phase change. Taking the refrigerant as a gas-liquid phase change material as an example, in the working condition where the heat exchange component reduces the temperature of the surrounding environment, the liquid refrigerant can enter the heat exchange component from the inlet of the heat exchange component. During the flow of the refrigerant in the heat exchange component, part of the refrigerant absorbs the surrounding temperature and changes to a gaseous state, so that the heat exchange component can play a role in reducing the temperature of the surrounding environment and can achieve the effect of reducing the temperature of the battery cell. The refrigerant is finally discharged from the outlet of the heat exchange component in a gas-liquid mixed state.

[0063] In the current heat exchange assembly, the refrigerant pressure at the inlet of the heat exchange assembly is relatively high, and as the refrigerant flows in the heat exchange assembly, the refrigerant pressure is prone to loss, and the pressure loss is likely to cause the refrigerant to change phase and absorb additional heat, which is likely to cause the temperature at the corresponding position to further decrease. According to the above analysis, the amount of heat absorbed by the refrigerant is not only affected by the external environment (such as the heat generated by the battery cell), but also by the structure of the heat exchange assembly itself. Therefore, in the current heat exchange assembly, the temperature near the outlet of the heat exchange assembly is usually lower than the temperature near the inlet of the heat exchange assembly, resulting in uneven temperature distribution of the heat exchange assembly.

[0064] Based on the above considerations, in order to alleviate the problem of uneven temperature distribution in the heat exchange component, an embodiment of the present application provides a battery device, wherein a flow channel is provided in the base body for the circulation of refrigerant; the flow channel includes an inlet section, a heat exchange section and an outlet section, the refrigerant enters the heat exchange component through the inlet section, the refrigerant is discharged out of the heat exchange component through the outlet section, and the refrigerant exchanges heat with the external environment in the heat exchange section; the cross-sectional area of ​​the outlet section is smaller than the cross-sectional area of ​​the inlet section.

[0065] In such a battery device, the cross-sectional area of ​​the outlet section is smaller than the cross-sectional area of ​​the inlet section, so that the pressure of the refrigerant in the outlet section is increased through the inner wall of the flow channel to compensate for the pressure loss of the refrigerant during the flow process, thereby reducing the phase change of the refrigerant caused by pressure loss and reducing the temperature difference between the outlet section and the inlet section, thereby improving the temperature uniformity of the heat exchange component.

[0066] The battery device disclosed in the embodiments of the present application can be used in an electrical device that uses the battery device as a power source or various energy storage systems that use the battery device as an energy storage element. The electrical device can 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, and the like. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like, and the spacecraft can include an airplane, a rocket, a space shuttle, and a spacecraft, and the like.

[0067] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0068] refer to Figure 1 , Figure 1 A 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 is provided inside the vehicle 1000, and the battery may be provided at the bottom, head or tail of the vehicle 1000. The battery may be used to power the vehicle 1000, for example, the battery may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 300 and a motor 200, and the controller 300 is used to control the battery to power the motor 200, for example, for starting, navigating and driving the vehicle 1000.

[0069] In some embodiments of the present application, the battery can be used not only as an operating power source for the vehicle 1000, but also 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.

[0070] refer to Figure 2 , Figure 2 Schematic diagram of the exploded structure of a battery device 100 provided in some embodiments of the present application.

[0071] The battery apparatus 100 mentioned in the embodiment of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells 20, and the plurality of battery cells 20 are connected in series, in parallel or in mixed connection through a busbar component.

[0072] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells 20 .

[0073] As an example, the battery cell assembly may be a battery module (Battery Module), and the battery module is formed by arranging and fixing a plurality of battery cells 20 to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells 20 by a cable tie.

[0074] In some embodiments, the battery device 100 may be a battery pack, which includes a case 10 and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case 10 .

[0075] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box body 10 by fixing the battery module in the box body 10 .

[0076] As an example, the battery cell assembly may also be accommodated in the case 10 by directly fixing the plurality of battery cells 20 to the case 10 .

[0077] As an example, the box 10 may include a first box 11 and a second box 12. The first box 11 and the second box 12 are buckled together to form a closed space inside the box 10 to accommodate the battery cell assembly. The closed space here means to cover or close, which can be sealed or unsealed. The first box 11 can be a top cover or a bottom plate.

[0078] As an example, the box body 10 may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body 10 to accommodate the battery cell assembly.

[0079] In some embodiments, the box 10 can be used as a part of the chassis structure of the vehicle 1000. For example, part of the box 10 can become at least a part of the floor of the vehicle 1000, or part of the box 10 can become at least a part of the cross beam and longitudinal beam of the vehicle 1000.

[0080] refer to Figure 3 , Figure 3A schematic diagram of the exploded structure of a battery cell 20 provided in some embodiments of the present application. A battery cell 20 refers to the smallest unit that constitutes a battery. A battery cell 20 may be a secondary battery, which refers to a battery cell 20 that can be used continuously by activating the active material by charging after the battery cell 20 is discharged.

[0081] The battery cell 20 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0082] As shown in the figure, the battery cell 20 includes an outer shell, an electrode assembly 23 and other functional components, and the outer shell includes a shell 21 and an end cover 22.

[0083] The end cap 22 refers to a component that covers the opening of the shell 21 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 22 can be adapted to the shape of the shell 21 to match the shell 21. Optionally, the end cap 22 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 22 is not easily deformed when squeezed and collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 24 can be provided on the end cap 22. The electrode terminal 24 can be used to electrically connect with the electrode assembly 23 for outputting or inputting electrical energy of the battery cell 20. In some embodiments, the end cap 22 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The material of the end cap 22 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this. In some embodiments, an insulating member may be provided inside the end cap 22, and the insulating member may be used to isolate the electrical connection components in the housing 21 from the end cap 22 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, or the like.

[0084] The shell 21 is a component used to cooperate with the end cap 22 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 23, the electrolyte and other components. The shell 21 and the end cap 22 can be independent components, and an opening can be set on the shell 21, and the internal environment of the battery cell 20 is formed by covering the opening with the end cap 22 at the opening. Without limitation, the end cap 22 and the shell 21 can also be integrated. Specifically, the end cap 22 and the shell 21 can form a common connection surface before other components are put into the shell, and when the interior of the shell 21 needs to be encapsulated, the end cap 22 covers the shell 21. The shell 21 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 21 can be determined according to the specific shape and size of the electrode assembly 23. The material of the shell 21 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0085] The electrode assembly 23 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 23 may be included in the housing 21. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 23, and the parts of the positive and negative electrode sheets without active materials each constitute a tab. The positive tab and the negative tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tabs connect the electrode terminals 24 to form a current loop.

[0086] refer to Figure 2 , Figure 4 , Figure 5 In the first aspect, the embodiment of the present application provides a battery device 100, including a battery cell 20 and a heat exchange assembly 30. The heat exchange assembly 30 is used for heat exchange with the battery cell 20. The heat exchange assembly 30 includes a base 31, and a flow channel 32 is provided in the base 31 to guide the refrigerant to flow along a set flow path. The flow channel 32 includes an inlet section 321, a heat exchange section 322 and an outlet section 323 connected in sequence. The inlet section 321 is used for the refrigerant to enter the heat exchange assembly 30, and the outlet section 323 is used for the refrigerant to be discharged outside the heat exchange assembly 30; in the direction perpendicular to the flow path, the cross-sectional area of ​​the outlet section 323 is smaller than the cross-sectional area of ​​the inlet section 321.

[0087] A battery cell 20 refers to the smallest unit that makes up the battery device 100. The battery cell 20 may be a cylindrical structure, a prismatic structure, a sheet structure, or a structure of other shapes. The number of battery cells 20 may be one, or two or more. When there are multiple battery cells 20, the multiple battery cells 20 may be arranged in one or two different directions, and the multiple battery cells 20 may be connected in series, in parallel, or mixed.

[0088] The heat exchange assembly 30 is a structure in the battery device 100 used for heat exchange with the battery cell 20. The number of heat exchange assemblies 30 can be one or two or more. When there are multiple battery cells 20, the number of heat exchange assemblies 30 can be one, and the heat exchange assembly 30 is used to exchange heat with each battery cell 20 to control the temperature of each battery cell 20. When there are multiple battery cells 20, the number of heat exchange assemblies 30 can also be two or more. In this case, one heat exchange assembly 30 can exchange heat with one or more battery cells 20 in the same row or column. The heat exchange assembly 30 can be located above the battery cell 20 and adjacent to the electrode terminal 24 of the battery cell 20. The heat exchange assembly 30 can also be located below the battery cell 20. The heat exchange assembly 30 can also be located on the side of the battery cell 20 or between two adjacent battery cells 20. The heat exchange assembly 30 can also be located at other positions.

[0089] The base 31 refers to a structure in the heat exchange component 30 used to carry the refrigerant and provide a fixed foundation for the joint or other structures. The base 31 can be a plate-like structure, such as a rectangular plate-like structure, a circular plate-like structure or a plate-like structure of other shapes. The base 31 can also be a strip-like structure, such as a rectangular straight strip-like structure, a rectangular bent strip-like structure, a cylindrical bent strip-like structure or a strip-like structure of other shapes.

[0090] The base 31 can be connected to the box body 10. The base 31 can be fixedly connected to the box body 10 by welding, bonding or other methods, or can be detachably connected to the box body 10 by snapping, screwing or other methods; the base 31 can be directly connected to the box body 10, or can be indirectly connected to the box body 10 through an intermediate structure; the base 31 can be located inside the box body 10, or can be located outside the box body 10. The base 31 can be located at the bottom of each battery cell 20, or can be located between two adjacent battery cells 20, or can be located at the top of the battery cell 20 and adjacent to the electrode terminal 24; the material of the base 31 may include metal, plastic or other materials.

[0091] The flow channel 32 refers to a channel structure formed in the substrate 31. The flow channel 32 may be a channel structure provided in the substrate 31. The flow channel 32 may be formed by a pipe structure embedded in the substrate 31. The flow channel 32 may be a straight channel structure, a serpentine channel structure, a spiral channel structure or a channel structure of other shapes. The cross-sectional shape of the flow channel 32 may be circular, polygonal or other shapes.

[0092] The flow channel 32 is used for the flow of refrigerant. The refrigerant refers to a substance that can enter and exit the heat exchange component 30. The refrigerant can exchange heat with the external environment and change its own form while flowing through the flow channel 32. For example, the refrigerant can be a gas-liquid phase change material, a solid-liquid phase change material or other materials.

[0093] The flow channel 32 is used to guide the refrigerant to flow along the flow path, which is the path along which the refrigerant flows in the flow channel 32 under the restriction of the inner wall of the flow channel 32, and the flow path is consistent with the extension direction of the flow channel 32. For example, when the flow channel 32 is a straight channel structure, the flow path is a straight path; when the flow channel 32 is a serpentine channel structure, the flow path is a serpentine path.

[0094] The inlet section 321 refers to the portion of the flow channel 32 for supplying the refrigerant to enter the heat exchange component 30. One end of the inlet section 321 is connected to the external space outside the heat exchange component 30, so that the refrigerant can enter the inlet section 321 from this end and then enter the heat exchange component 30; the end of the inlet section 321 connected to the external space can be connected to a fluid pump, a booster or other devices.

[0095] The inlet section 321 may include a certain channel structure in the flow channel 32, or may include two or more channel structures in the flow channel 32. When the inlet section 321 includes two or more channel structures in the flow channel 32, the multiple channel structures may be connected in series, in parallel or mixed.

[0096] The heat exchange section 322 refers to the portion of the flow channel 32 adjacent to the battery cell 20. One end of the heat exchange section 322 is connected to the inlet section 321 so that the refrigerant can enter the heat exchange section 322 from the inlet section 321. Because the heat exchange section 322 is adjacent to the battery cell 20, the refrigerant can exchange heat with the adjacent battery cell 20 during the process of flowing in the heat exchange section 322, so as to achieve the effect of the heat exchange component 30 controlling the temperature of the battery cell 20.

[0097] The heat exchange section 322 may include a certain channel structure in the flow channel 32, or may include two or more channel structures in the flow channel 32. When the heat exchange section 322 includes two or more channel structures in the flow channel 32, the multiple channel structures may be connected in series, in parallel or mixed.

[0098] The outlet section 323 refers to the portion of the flow channel 32 used to discharge the refrigerant to the external space outside the heat exchange component 30. One end of the outlet section 323 is connected to the heat exchange section 322 so that the refrigerant in the heat exchange section 322 can enter the outlet section 323, and the other end of the outlet section 323 is connected to the external space so that the refrigerant in the outlet section 323 can flow out of the heat exchange component 30; the end of the outlet section 323 connected to the external space can be connected to a fluid pump, a radiator or other devices, and the outlet section 323 can also be connected to the inlet section 321 through a pipe, device, etc. outside the heat exchange component 30 to realize the circulation of the refrigerant.

[0099] The outlet section 323 may include a certain channel structure in the flow channel 32, or may include two or more channel structures in the flow channel 32. When the outlet section 323 includes two or more channel structures in the flow channel 32, the multiple channel structures may be connected in series, in parallel or mixed.

[0100] It is understandable that the inlet section 321 and the outlet section 323 may be adjacent to the battery cell 20 , and the refrigerant may also perform heat exchange with the adjacent battery cell 20 in the inlet section 321 and the outlet section 323 ; the battery cell 20 may not be set at the position of the inlet section 321 and the outlet section 323 .

[0101] In the direction perpendicular to the flow path, the cross-sectional area of ​​the outlet section 323 reflects the flow area of ​​the refrigerant in the outlet section 323, and the cross-sectional area of ​​the inlet section 321 reflects the flow area of ​​the refrigerant in the inlet section 321; the cross-sectional area of ​​the outlet section 323 is made smaller than the cross-sectional area of ​​the inlet section 321, so that the pressure received by the refrigerant in the outlet section 323 from the inner wall of the flow channel 32 is greater than the pressure received by the refrigerant in the inlet section 321 from the inner wall of the flow channel 32. At this time, the pressure difference can make up for the pressure lost by the refrigerant during the flow process, and can reduce the phase change of the refrigerant caused by the pressure loss, thereby reducing the uneven temperature distribution of the heat exchange component 30.

[0102] In this embodiment, the flow channel 32 in the heat exchange component 30 includes an inlet section 321, a heat exchange section 322 and an outlet section 323, so that the refrigerant can enter the heat exchange component 30 through the inlet section 321, and the refrigerant can be discharged to the heat exchange component 30 through the outlet section 323; the cross-sectional area of ​​the outlet section 323 is smaller than the cross-sectional area of ​​the inlet section 321, so that the pressure of the refrigerant in the outlet section 323 is increased through the inner wall of the flow channel 32, the pressure loss of the refrigerant in the flow process is supplemented, and the phase change of the refrigerant caused by the pressure loss is reduced, so as to reduce the temperature difference between the outlet section 323 and the inlet section 321, thereby improving the temperature uniformity of the heat exchange component 30.

[0103] refer to Figure 6 , Figure 7In some embodiments, in a direction perpendicular to the flow path, a cross-sectional height of the outlet section 323 is less than or equal to a cross-sectional height of the inlet section 321 .

[0104] Figure 7 The dashed line shows the cross-sectional profile of the inlet section 321 .

[0105] In the direction perpendicular to the flow path, the cross-sectional height of the outlet section 323 refers to the maximum dimension of the cross-sectional height of the outlet section 323, that is, Figure 7 The dimension shown as H2 in FIG. 1 ; wherein the height direction refers to the direction perpendicular to the flow path.

[0106] In the direction perpendicular to the flow path, the cross-sectional height of the inlet section 321 refers to the maximum dimension of the cross section of the inlet section 321 in the height direction, that is, Figure 7 The dimensions shown in H1.

[0107] The cross-sectional height of the outlet section 323 may be smaller than the cross-sectional height of the inlet section 321 , that is, H2 is smaller than H1 , so that the cross-sectional area of ​​the outlet section 323 can be smaller than the cross-sectional area of ​​the inlet section 321 .

[0108] It can be understood that, in the case that other cross-sectional dimensions of the outlet section 323 are smaller than other cross-sectional dimensions of the inlet section 321 , the cross-sectional height of the outlet section 323 may also be equal to the cross-sectional height of the inlet section 321 .

[0109] This embodiment provides some specific structures in which the cross-sectional area of ​​the outlet section 323 is smaller than the cross-sectional area of ​​the inlet section 321, so that the cross-sectional height of the outlet section 323 is smaller than the cross-sectional height of the inlet section 321, so that the cross-sectional area of ​​the outlet section 323 is smaller than the cross-sectional area of ​​the inlet section 321, thereby reducing the pressure difference between the outlet section 323 and the inlet section 321, thereby reducing the temperature difference between the outlet section 323 and the inlet section 321.

[0110] refer to Figure 6 , Figure 8 In some embodiments, in a direction perpendicular to the flow path, the cross-sectional width of the outlet section 323 is less than or equal to the cross-sectional width of the inlet section 321 .

[0111] Figure 8 The dashed line shows the cross-sectional profile of the inlet section 321 .

[0112] In the direction perpendicular to the flow path, the cross-sectional width of the outlet section 323 refers to the maximum dimension of the cross section of the outlet section 323 in the width direction, that is, Figure 8 The dimension shown by L2 in the figure; wherein the width direction refers to the direction perpendicular to the flow path and perpendicular to the height direction.

[0113] In the direction perpendicular to the flow path, the cross-sectional width of the inlet section 321 refers to the maximum dimension of the cross section of the inlet section 321 in the width direction, that is, Figure 8 The dimensions shown in L1.

[0114] The cross-sectional width of the outlet section 323 may be smaller than the cross-sectional width of the inlet section 321 , that is, L2 is smaller than L1 , so that the cross-sectional area of ​​the outlet section 323 can be smaller than the cross-sectional area of ​​the inlet section 321 .

[0115] It can be understood that, in the case that other cross-sectional dimensions of the outlet section 323 are smaller than other cross-sectional dimensions of the inlet section 321 , the cross-sectional width of the outlet section 323 may also be equal to the cross-sectional width of the inlet section 321 .

[0116] It can be understood that, on the basis that the cross-sectional area of ​​the outlet section 323 is smaller than the cross-sectional area of ​​the inlet section 321, only the cross-sectional height of the outlet section 323 can be smaller than the cross-sectional height of the inlet section 321, or only the cross-sectional width of the outlet section 323 can be smaller than the cross-sectional width of the inlet section 321, or both the cross-sectional height and the cross-sectional width of the outlet section 323 can be smaller than the cross-sectional height and the cross-sectional width of the inlet section 321.

[0117] This embodiment provides other specific structures in which the cross-sectional area of ​​the outlet section 323 is smaller than the cross-sectional area of ​​the inlet section 321, so that the cross-sectional width of the outlet section 323 is smaller than the cross-sectional width of the inlet section 321, so that the cross-sectional area of ​​the outlet section 323 is smaller than the cross-sectional area of ​​the inlet section 321, thereby reducing the pressure difference between the outlet section 323 and the inlet section 321, thereby reducing the temperature difference between the outlet section 323 and the inlet section 321.

[0118] refer to Figure 6 , Fig. 9 , Fig.10 In some embodiments, in a direction perpendicular to the flow path, the cross-sectional area of ​​the heat exchange section 322 is smaller than the cross-sectional area of ​​the inlet section 321 .

[0119] In the direction perpendicular to the flow path, the cross-sectional area of ​​the heat exchange section 322 reflects the flow area of ​​the refrigerant in the heat exchange section 322, and the cross-sectional area of ​​the inlet section 321 reflects the flow area of ​​the refrigerant in the inlet section 321; the cross-sectional area of ​​the heat exchange section 322 is made smaller than the cross-sectional area of ​​the inlet section 321, so that the pressure received by the refrigerant in the heat exchange section 322 from the inner wall of the flow channel 32 is greater than the pressure received by the refrigerant in the inlet section 321 from the inner wall of the flow channel 32. At this time, the pressure difference can make up for the pressure lost by the refrigerant during the flow process, and can reduce the phase change of the refrigerant caused by the pressure loss, thereby reducing the uneven temperature distribution of the heat exchange component 30.

[0120] Because the refrigerant first enters the heat exchange component 30 through the inlet section 321, and then enters the heat exchange section 322 from the inlet section 321, that is, in the flow path of the refrigerant, the heat exchange section 322 is located after the inlet section 321. Therefore, there is usually a pressure loss in the refrigerant during the flow process from the inlet section 321 to the heat exchange section 322. The pressure loss will also cause the refrigerant to undergo additional phase changes and absorb additional energy, thereby causing uneven temperature of the heat exchange component 30.

[0121] Accordingly, in this embodiment, the cross-sectional area of ​​the heat exchange section 322 is also smaller than the cross-sectional area of ​​the inlet section 321, so as to increase the pressure of the refrigerant in the heat exchange section 322 through the inner wall of the flow channel 32, compensate for the pressure loss of the refrigerant during the flow process, and reduce the phase change of the refrigerant caused by the pressure loss, so as to reduce the temperature difference between the heat exchange section 322 and the inlet section 321, thereby improving the temperature uniformity of the heat exchange component 30.

[0122] refer to Figure 6 , Fig. 9 In some embodiments, in a direction perpendicular to the flow path, a cross-sectional height of the heat exchange section 322 is less than or equal to a cross-sectional height of the inlet section 321 .

[0123] Fig. 9 The middle dotted lines show the cross-sectional shapes of the inlet section 321 and the outlet section 323 , respectively, wherein the cross-sectional contour of the inlet section 321 is outside the cross-sectional contour of the heat exchange section 322 , and the cross-sectional contour of the outlet section 323 is inside the cross-sectional contour of the heat exchange section 322 .

[0124] In the direction perpendicular to the flow path, the cross-sectional height of the heat exchange section 322 refers to the maximum dimension of the cross-sectional height of the heat exchange section 322, that is, Fig. 9 The dimension shown as H3 in FIG. 1 , wherein the height direction refers to the direction perpendicular to the flow path.

[0125] In the direction perpendicular to the flow path, the cross-sectional height of the inlet section 321 refers to the maximum dimension of the cross section of the inlet section 321 in the height direction, that is, Fig. 9 The dimensions shown in H1.

[0126] The cross-sectional height of the heat exchange section 322 may be smaller than the cross-sectional height of the inlet section 321 , that is, H3 is smaller than H1 , so that the cross-sectional area of ​​the heat exchange section 322 can be smaller than the cross-sectional area of ​​the inlet section 321 .

[0127] It can be understood that, when other cross-sectional dimensions of the heat exchange section 322 are smaller than other cross-sectional dimensions of the inlet section 321 , the cross-sectional height of the heat exchange section 322 may also be equal to the cross-sectional height of the inlet section 321 .

[0128] This embodiment provides some specific structures in which the cross-sectional area of ​​the heat exchange section 322 is smaller than the cross-sectional area of ​​the inlet section 321, so that the cross-sectional height of the heat exchange section 322 is smaller than the cross-sectional height of the inlet section 321, so that the cross-sectional area of ​​the heat exchange section 322 is smaller than the cross-sectional area of ​​the inlet section 321, thereby reducing the pressure difference between the heat exchange section 322 and the inlet section 321, thereby reducing the temperature difference between the heat exchange section 322 and the inlet section 321.

[0129] refer to Figure 6 , Fig.10 In some embodiments, in a direction perpendicular to the flow path, the cross-sectional width of the heat exchange section 322 is less than or equal to the cross-sectional width of the inlet section 321 .

[0130] Fig.10 The middle dotted lines show the cross-sectional shapes of the inlet section 321 and the outlet section 323 , respectively, wherein the cross-sectional contour of the inlet section 321 is outside the cross-sectional contour of the heat exchange section 322 , and the cross-sectional contour of the outlet section 323 is inside the cross-sectional contour of the heat exchange section 322 .

[0131] In the direction perpendicular to the flow path, the cross-sectional width of the heat exchange section 322 refers to the maximum dimension of the cross-sectional width of the heat exchange section 322, that is, Fig. 9 The dimension shown by L3 in the figure; wherein the width direction refers to the direction perpendicular to the flow path.

[0132] In the direction perpendicular to the flow path, the cross-sectional width of the inlet section 321 refers to the maximum dimension of the cross section of the inlet section 321 in the width direction, that is, Fig. 9 The dimensions shown in L1.

[0133] The cross-sectional width of the heat exchange section 322 may be smaller than the cross-sectional width of the inlet section 321 , that is, L3 is smaller than L1 , so that the cross-sectional area of ​​the heat exchange section 322 can be smaller than the cross-sectional area of ​​the inlet section 321 .

[0134] It can be understood that, when other cross-sectional dimensions of the heat exchange section 322 are smaller than other cross-sectional dimensions of the inlet section 321 , the cross-sectional width of the heat exchange section 322 may also be equal to the cross-sectional width of the inlet section 321 .

[0135] It can be understood that, on the basis that the cross-sectional area of ​​the heat exchange section 322 is smaller than the cross-sectional area of ​​the inlet section 321, only the cross-sectional height of the heat exchange section 322 can be smaller than the cross-sectional height of the inlet section 321, or only the cross-sectional width of the heat exchange section 322 can be smaller than the cross-sectional width of the inlet section 321, or both the cross-sectional height and the cross-sectional width of the heat exchange section 322 can be smaller than the cross-sectional height and the cross-sectional width of the inlet section 321.

[0136] This embodiment provides a specific structure in which the cross-sectional area of ​​other heat exchange sections 322 is smaller than the cross-sectional area of ​​the inlet section 321, so that the cross-sectional width of the heat exchange section 322 is smaller than the cross-sectional width of the inlet section 321, so that the cross-sectional area of ​​the heat exchange section 322 is smaller than the cross-sectional area of ​​the inlet section 321, thereby reducing the pressure difference between the heat exchange section 322 and the inlet section 321, thereby reducing the temperature difference between the heat exchange section 322 and the inlet section 321.

[0137] refer to Fig. 9 , Fig.10 In some embodiments, in a direction perpendicular to the flow path, the cross-sectional area of ​​the heat exchange section 322 is greater than the cross-sectional area of ​​the outlet section 323 .

[0138] In the direction perpendicular to the flow path, the cross-sectional area of ​​the outlet section 323 reflects the flow area of ​​the refrigerant in the outlet section 323, and the cross-sectional area of ​​the heat exchange section 322 reflects the flow area of ​​the refrigerant in the heat exchange section 322; the cross-sectional area of ​​the outlet section 323 is made smaller than the cross-sectional area of ​​the heat exchange section 322, so that the pressure received by the refrigerant in the outlet section 323 from the inner wall of the flow channel 32 is greater than the pressure received by the refrigerant in the heat exchange section 322 from the inner wall of the flow channel 32. At this time, the pressure difference can make up for the pressure lost by the refrigerant during the flow process, and can reduce the phase change of the refrigerant caused by the pressure loss, thereby reducing the uneven temperature distribution of the heat exchange component 30.

[0139] As the refrigerant flows in the flow channel 32, it first passes through the heat exchange section 322 and then enters the outlet section 323, that is, in the flow path of the refrigerant, the outlet section 323 is located after the heat exchange section 322. Therefore, there is usually a pressure loss in the refrigerant during the flow process from the heat exchange section 322 to the outlet section 323. The pressure loss will also cause the refrigerant to undergo additional phase changes and absorb additional energy, thereby causing uneven temperature of the heat exchange component 30.

[0140] Accordingly, in this embodiment, the cross-sectional area of ​​the heat exchange section 322 is larger than the cross-sectional area of ​​the outlet section 323. Since the refrigerant first passes through the heat exchange section 322 and then passes through the outlet section 323 during the flow process, the pressure of the refrigerant in the outlet section 323 is lower than the pressure of the refrigerant in the heat exchange section 322. Accordingly, it is necessary to make the cross-sectional area of ​​the outlet section 323 smaller so that the inner wall of the outlet section 323 can provide a greater pressure for the refrigerant to compensate for the pressure loss of the refrigerant, thereby reducing the pressure difference between the sections of the flow channel 32 and improving the temperature uniformity of the heat exchange component 30.

[0141] refer to Fig. 9 In some embodiments, in a direction perpendicular to the flow path, a cross-sectional height of the heat exchange section 322 is greater than or equal to a cross-sectional height of the outlet section 323 .

[0142] Fig. 9The middle dotted lines show the cross-sectional shapes of the inlet section 321 and the outlet section 323 , respectively, wherein the cross-sectional contour of the inlet section 321 is outside the cross-sectional contour of the heat exchange section 322 , and the cross-sectional contour of the outlet section 323 is inside the cross-sectional contour of the heat exchange section 322 .

[0143] In the direction perpendicular to the flow path, the cross-sectional height of the outlet section 323 refers to the maximum dimension of the cross-sectional height of the outlet section 323, that is, Fig. 9 The dimensions shown are H2.

[0144] In the direction perpendicular to the flow path, the cross-sectional height of the heat exchange section 322 refers to the maximum dimension of the cross-sectional height of the heat exchange section 322, that is, Fig. 9 The dimension shown as H3 in FIG. 1 , wherein the height direction refers to the direction perpendicular to the flow path.

[0145] The cross-sectional height of the heat exchange section 322 may be greater than the cross-sectional height of the outlet section 323 , that is, H3 is greater than H2 , so that the cross-sectional area of ​​the heat exchange section 322 can be greater than the cross-sectional area of ​​the outlet section 323 .

[0146] It can be understood that, when other cross-sectional dimensions of the heat exchange section 322 are greater than other cross-sectional dimensions of the outlet section 323 , the cross-sectional height of the heat exchange section 322 may also be equal to the cross-sectional height of the outlet section 323 .

[0147] This embodiment provides some specific structures in which the cross-sectional area of ​​the outlet section 323 is smaller than the cross-sectional area of ​​the heat exchange section 322, so that the cross-sectional height of the outlet section 323 is smaller than the cross-sectional height of the heat exchange section 322, so that the cross-sectional area of ​​the outlet section 323 is smaller than the cross-sectional area of ​​the heat exchange section 322, thereby reducing the pressure difference between the outlet section 323 and the heat exchange section 322, thereby reducing the temperature difference between the outlet section 323 and the heat exchange section 322.

[0148] refer to Fig.10 In some embodiments, in a direction perpendicular to the flow path, the cross-sectional width of the heat exchange section 322 is greater than or equal to the cross-sectional width of the outlet section 323 .

[0149] Fig.10 The middle dotted lines show the cross-sectional shapes of the inlet section 321 and the outlet section 323 , respectively, wherein the cross-sectional contour of the inlet section 321 is outside the cross-sectional contour of the heat exchange section 322 , and the cross-sectional contour of the outlet section 323 is inside the cross-sectional contour of the heat exchange section 322 .

[0150] In the direction perpendicular to the flow path, the cross-sectional width of the outlet section 323 refers to the maximum dimension of the cross section of the outlet section 323 in the width direction, that is, Fig. 9 The dimensions shown in L2.

[0151] In the direction perpendicular to the flow path, the cross-sectional width of the heat exchange section 322 refers to the maximum dimension of the cross-sectional width of the heat exchange section 322, that is, Fig. 9 The dimension shown by L3 in the figure; wherein the width direction refers to the direction perpendicular to the flow path.

[0152] The cross-sectional width of the heat exchange section 322 may be greater than the cross-sectional width of the outlet section 323 , that is, L3 is greater than L2 , so that the cross-sectional area of ​​the heat exchange section 322 can be greater than the cross-sectional area of ​​the outlet section 323 .

[0153] It can be understood that, when other cross-sectional dimensions of the heat exchange section 322 are greater than other cross-sectional dimensions of the outlet section 323 , the cross-sectional width of the heat exchange section 322 may also be equal to the cross-sectional width of the outlet section 323 .

[0154] It can be understood that, on the basis that the cross-sectional area of ​​the heat exchange section 322 is larger than the cross-sectional area of ​​the outlet section 323, only the cross-sectional height of the heat exchange section 322 can be larger than the cross-sectional height of the outlet section 323, or only the cross-sectional width of the heat exchange section 322 can be larger than the cross-sectional width of the outlet section 323, or both the cross-sectional height and the cross-sectional width of the heat exchange section 322 can be larger than the cross-sectional height and the cross-sectional width of the outlet section 323.

[0155] This embodiment provides other specific structures in which the cross-sectional area of ​​the outlet section 323 is smaller than the cross-sectional area of ​​the heat exchange section 322, so that the cross-sectional width of the outlet section 323 is smaller than the cross-sectional width of the heat exchange section 322, so that the cross-sectional area of ​​the outlet section 323 is smaller than the cross-sectional area of ​​the heat exchange section 322, thereby reducing the pressure difference between the outlet section 323 and the heat exchange section 322, thereby reducing the temperature difference between the outlet section 323 and the heat exchange section 322.

[0156] In some embodiments, along the flow path, the flow channel 32 is gradually narrowed from the inlet section 321 to the outlet section 323 .

[0157] The flow channel 32 is configured to be tapered from the inlet section 321 to the outlet section 323, that is, the inner diameters of the inlet section 321, the heat exchange section 322 and the outlet section 323 gradually decrease along the flow path; under this configuration, as the refrigerant flows along the flow path in the flow channel 32, the pressure exerted on the refrigerant by the inner wall of the flow channel 32 gradually increases, thereby compensating for the pressure lost by the refrigerant during the flow process, reducing the phase change of the refrigerant caused by pressure loss, reducing the temperature difference between different parts of the heat exchange component 30, and improving the temperature uniformity of the heat exchange component 30.

[0158] Under this setting, the inner wall of the flow channel 32 can also form a continuous structure without the appearance of steps, faults or other structures, so that the refrigerant can flow normally in the flow channel 32 and it is difficult for eddy currents, turbulence and the like to appear in the flow channel 32, thereby improving the stability of the heat exchange component 30.

[0159] In the present embodiment, the cross-sectional area of ​​the flow channel 32 is gradually reduced from the inlet section 321, the heat exchange section 322 to the outlet section 323. Since the refrigerant flows along the direction of the inlet section 321, the heat exchange section 322 to the outlet section 323, and gradually loses pressure and undergoes a phase change accordingly during the flow process, this setting can compensate for the pressure loss of the refrigerant through the gradually shrinking inner wall of the flow channel 32, so as to reduce the phase change of the refrigerant caused by the pressure loss, thereby improving the uniformity of the heat exchange component 30; at the same time, this setting can also make the interior of the flow channel 32 smoother and less prone to a stepped structure, thereby reducing the risk of vortices and turbulence in the refrigerant in the flow channel 32.

[0160] refer to Figure 4 , Fig.11 In some embodiments, the base 31 includes a first plate 311 and a second plate 312 , and the first plate 311 is provided with a flow channel groove 3111 ; the second plate 312 is connected to the first plate 311 and covers the flow channel groove 3111 to form a flow channel 32 .

[0161] The first plate body 311 refers to a structure in the base body 31 for carrying the refrigerant. The shape of the first plate body 311 may be square, circular or other shapes; the material of the first plate body 311 may include metal, plastic or other materials.

[0162] The flow channel 3111 refers to a groove structure provided on the first plate 311. The refrigerant can flow in the flow channel 3111. The extension direction of the flow channel 3111 is the same as the flow path. The cross-sectional shape of the flow channel 3111 can be square, semicircular, trapezoidal or other shapes.

[0163] The second plate 312 refers to a structure in the base 31 for cooperating with the first plate 311 to form the flow channel 32 . The shape of the second plate 312 may be square, circular or other shapes. The material of the second plate 312 may include metal, plastic or other materials.

[0164] The second plate body 312 is connected to the first plate body 311. The second plate body 312 can be connected to the first plate body 311 by welding, bonding or other methods. After the second plate body 312 is connected to the first plate body 311, it covers the flow channel groove 3111 to cooperate with the first plate body 311 to form a channel structure, which is the flow channel 32.

[0165] This embodiment provides some specific structures of the base 31 , wherein a flow channel groove 3111 is provided on the first plate 311 , and the flow channel 32 is formed by covering the flow channel groove 3111 through the second plate 312 , so as to facilitate the processing and forming of the flow channel 32 .

[0166] In some embodiments, a refrigerant flows in the flow channel 32 , and the refrigerant is a gas-liquid phase change material or a solid-liquid phase change material.

[0167] Phase change material refers to a material that can change from one physical state to another to absorb or release heat. During the flow of the refrigerant in the flow channel 32, it can absorb heat and undergo a change in physical state, or it can release heat and undergo a change in physical state. The refrigerant can be a gas-liquid phase change material or a solid-liquid phase change material.

[0168] For example, the gas-liquid phase change material can change from a liquid state to a gas state and absorb heat in the process, and the gas-liquid phase change material can also change from a gas state to a liquid state and release heat in the process.

[0169] For example, the solid-liquid phase change material changes from solid to liquid and absorbs heat in the process. The solid-liquid phase change material can also change from liquid to solid and release heat in the process. It can be understood that the solid state of the solid-liquid phase change material can be granular, powdery or other solid states.

[0170] The gas-liquid phase change material or the solid-liquid phase change material may include tetrafluoroethane, difluoromethane, pentafluoroethane, etc.

[0171] It is understandable that during the processing, transportation, and sales of the heat exchange component 30, no refrigerant may be provided in the heat exchange component 30; similarly, during the processing, transportation, and sales of the battery device 100, no refrigerant may be provided in the heat exchange component 30 and the battery device 100.

[0172] This embodiment provides some specific types of refrigerants so that the refrigerants can absorb the heat generated by the battery cells 20 during operation through phase change.

[0173] In some embodiments, the battery device 100 includes a battery cell 20 and a heat exchange assembly 30 , and the heat exchange assembly 30 is disposed below the battery cell 20 .

[0174] The heat exchange assembly 30 includes a first plate body 311 and a second plate body 312 . The first plate body 311 is provided with a flow channel groove 3111 . The second plate body 312 is connected to the first plate body 311 and covers the flow channel groove 3111 to enclose a flow channel 32 .

[0175] The flow channel 32 is used for circulating the refrigerant, and the refrigerant may be a gas-liquid phase change material or a solid-liquid phase change material.

[0176] The flow channel 32 includes an inlet section 321, a heat exchange section 322 and an outlet section 323 which are connected in sequence; wherein the cross-section of the outlet section 323 is smaller than the cross-sectional area of ​​the heat exchange section 322, and the cross-sectional area of ​​the heat exchange section 322 is smaller than the cross-sectional area of ​​the inlet section 321; on the circulation path of the refrigerant, the inner walls of the inlet section 321, the heat exchange section 322 and the outlet section 323 are tapered.

[0177] The inlet section 321 includes a plurality of sub-inlet sections 321 connected in parallel, each of which is connected to the external space at one end and to the heat exchange section 322 at the other end; the heat exchange section 322 includes a plurality of sub-heat exchange sections 322 connected in parallel, each of which is connected to a sub-inlet section 321; the outlet section 323 includes a plurality of sub-outlet sections 323, each of which is connected to one or more sub-heat exchange sections 322 at one end and to the external space at the other end.

[0178] In a second aspect, embodiments of the present application further provide an electrical device, including the battery device 100 provided in some embodiments of the first aspect.

[0179] In the electrical device, the temperature at each position inside the battery device 100 is relatively uniform, and the temperature of the battery cells 20 at different positions is also relatively uniform, thereby reducing the occurrence of local low temperature of the battery device 100, so that the battery cells 20 at different positions can all operate in a more suitable ambient temperature.

[0180] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: include: Battery cells; A heat exchange component, used for heat exchange with the battery monomer, the heat exchange component comprising a base, a flow channel is provided in the base to guide the refrigerant to flow along a set flow path, the flow channel comprises an inlet section, a heat exchange section and an outlet section connected in sequence, the inlet section is used for the refrigerant to enter the heat exchange component, and the outlet section is used for the refrigerant to be discharged outside the heat exchange component; In a direction perpendicular to the flow path, a cross-sectional area of ​​the outlet section is smaller than a cross-sectional area of ​​the inlet section.

2. The battery device according to claim 1, characterized in that: In a direction perpendicular to the flow path, a cross-sectional height of the outlet section is less than or equal to a cross-sectional height of the inlet section.

3. The battery device according to claim 1 or 2, characterized in that: In a direction perpendicular to the flow path, a cross-sectional width of the outlet section is smaller than or equal to a cross-sectional width of the inlet section.

4. The battery device according to claim 1, characterized in that: In a direction perpendicular to the flow path, a cross-sectional area of ​​the heat exchange section is smaller than a cross-sectional area of ​​the inlet section.

5. The battery device according to claim 4, characterized in that: In a direction perpendicular to the flow path, a cross-sectional height of the heat exchange section is less than or equal to a cross-sectional height of the inlet section.

6. The battery device according to claim 4 or 5, characterized in that: In a direction perpendicular to the flow path, a cross-sectional width of the heat exchange section is less than or equal to a cross-sectional width of the inlet section.

7. The battery device according to claim 4, characterized in that: In a direction perpendicular to the flow path, a cross-sectional area of ​​the heat exchange section is larger than a cross-sectional area of ​​the outlet section.

8. The battery device according to claim 7, characterized in that: In a direction perpendicular to the flow path, a cross-sectional height of the heat exchange section is greater than or equal to a cross-sectional height of the outlet section.

9. The battery device according to claim 7 or 8, characterized in that: In a direction perpendicular to the flow path, a cross-sectional width of the heat exchange section is greater than or equal to a cross-sectional width of the outlet section.

10. The battery device according to claim 1, characterized in that: Along the flow path, the flow channel is gradually narrowed from the inlet section to the outlet section.

11. The battery device according to claim 1, characterized in that: The base body comprises a first plate body and a second plate body, and the first plate body is provided with a flow channel groove; The second plate body is connected to the first plate body and covers the flow channel groove to form the flow channel.

12. The battery device according to claim 1, characterized in that: A refrigerant flows in the flow channel, and the refrigerant is a gas-liquid phase change material or a solid-liquid phase change material.

13. An electrical device, characterized in that: Comprising the battery device according to any one of claims 1-12.

Images