Battery device, refrigerant heat exchange component, energy storage device and electric device

Abstract

The present application is applicable to the technical field of batteries. Provided are a battery device (100), a refrigerant heat exchange component (30), an energy storage device and an electric device. The battery device comprises: a battery cell assembly (20); and the refrigerant heat exchange component having a heat exchange flow channel (31), wherein the heat exchange flow channel comprises heat exchange sub-flow channels (311), and each heat exchange sub-flow channel comprises at least two branch flow channels (3111); and each heat exchange sub-flow channel comprises a first heat exchange sub-flow channel (311a) and a second heat exchange sub-flow channel (311b). The refrigerant heat exchange component further comprises a heat exchange surface (32) corresponding to the heat exchange flow channel, wherein the heat exchange surface has a first region (321) and a second region (322), and the arrangement density of branch flow channels in each first heat exchange sub-flow channel within the first region is greater than that of branch flow channels in each second heat exchange sub-flow channel within the second region. The battery device provided in the embodiments of the present application improves the heat exchange capability of the part of the cell assembly corresponding to the refrigerant heat exchange component within the first region, thereby enabling more uniform temperature distribution at different parts of the battery cell assembly.

Description

Battery devices, refrigerant heat exchange components, energy storage devices, and electrical appliances

[0001] This application claims priority to Chinese Patent Application No. 202510199014.9, filed on February 21, 2025, entitled “Battery Device, Refrigerant Heat Exchange Component, Energy Storage Device and Electrical Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and in particular to a battery device, a refrigerant heat exchange component, an energy storage device, and an electrical device. Background Technology

[0003] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0004] During the current battery device's operation, the battery cells located in the middle of the battery device have a higher temperature than those located on the periphery. The refrigerant heat exchange components also have a poor effect on the temperature control of the battery cells in the middle of the battery device. The temperature distribution of battery cells in different locations inside the battery device is uneven and varies greatly. Summary of the Invention

[0005] In view of the above problems, this application provides a battery device, a refrigerant heat exchange component, an energy storage device, and an electrical device, which can alleviate the problem of uneven temperature distribution of battery cells in different locations inside the battery device.

[0006] In a first aspect, embodiments of this application provide a battery device, comprising:

[0007] The battery cell assembly includes a refrigerant heat exchange component with internal heat exchange channels for refrigerant heat exchange medium flow. Each heat exchange channel includes at least two sub-heat exchange channels arranged sequentially along a first direction. Each sub-heat exchange channel includes at least two interconnected branch channels, spaced apart. Each sub-heat exchange channel includes a first sub-heat exchange channel and at least one second sub-heat exchange channel, with each second sub-heat exchange channel located on one side or opposite sides of the first sub-heat exchange channel. The refrigerant heat exchange component also includes a heat exchange surface corresponding to the heat exchange channels, with the first direction parallel to the heat exchange surface. The heat exchange surface is positioned close to or in contact with the battery cell assembly. The heat exchange surface has a first region and a second region, with the first region corresponding to the first sub-heat exchange channel and the second region corresponding to the second sub-heat exchange channel. The arrangement density of each branch channel in the first sub-heat exchange channel within the first region is greater than the arrangement density of each branch channel in the second sub-heat exchange channel within the second region.

[0008] In this embodiment, the heat exchange channel includes a first sub-heat exchange channel and at least one second sub-heat exchange channel. The distribution density of the branch channels in the first sub-heat exchange channel in the first region is greater than the distribution density of the branch channels in the second sub-heat exchange channel in the second region. This improves the heat exchange capability of the refrigerant heat exchange component in the first region corresponding to a portion of the battery cell assembly, allowing for better heat exchange with the parts of the battery cell assembly where the temperature changes rapidly. This results in a more uniform temperature distribution in different parts of the battery cell assembly, thus improving the temperature uniformity of the battery cell assembly.

[0009] In some embodiments, the ratio of the arrangement density of each branch channel in the first sub-heat exchange channel in the first region to the arrangement density of each branch channel in the second sub-heat exchange channel in the second region ranges from 1.5 to 4.

[0010] The technical solution of this embodiment provides a range of ratios between the distribution density of the sub-channels in the first sub-heat exchange channel and the distribution density of the sub-channels in the second sub-heat exchange channel, so that the first sub-heat exchange channel can have better heat exchange capacity in the first region, so that the refrigerant heat exchange component can perform more efficient heat exchange on the parts of the battery cell assembly where the temperature changes rapidly, thereby improving the temperature uniformity of the battery cell assembly.

[0011] In some embodiments, the sub-channels in the first sub-heat exchange channel are spaced apart by a first spacing, and the sub-channels in the second sub-heat exchange channel are spaced apart by a second spacing, wherein the first spacing is smaller than the second spacing.

[0012] In this embodiment, the spacing between the sub-channels in the first sub-heat exchange channel is smaller than the spacing between the sub-channels in the second sub-heat exchange channel. This makes the arrangement density of the sub-channels in the first sub-heat exchange channel in the first region greater than the arrangement density of the sub-channels in the second sub-heat exchange channel in the second region. This allows the refrigerant heat exchange component to perform more efficient heat exchange on the parts of the battery cell assembly where the temperature changes rapidly, thereby improving the temperature uniformity of the battery cell assembly.

[0013] In some embodiments, the first spacing ranges from 2 mm to 7 mm.

[0014] The technical solution of this embodiment provides a range of first spacings so that the spacing between each branch channel in the first sub-heat exchange channel is smaller, thereby enabling a larger arrangement density of the branch channels in the first sub-heat exchange channel within the first region and achieving higher heat exchange efficiency.

[0015] In some embodiments, the second spacing ranges from 20 mm to 30 mm.

[0016] The technical solution of this embodiment provides a range of second spacings so that the spacing between each branch channel in the second sub-heat exchange channel can be greater than the spacing between each branch channel in the first sub-heat exchange channel, thereby making the arrangement density of the branch channels in the first sub-heat exchange channel in the first region greater than the arrangement density of the branch channels in the second sub-heat exchange channel in the second region.

[0017] In some embodiments, the width of the branch channel ranges from 5 mm to 12 mm.

[0018] The technical solution of this embodiment provides a range of channel widths so that a single channel and a battery cell can have a certain heat exchange area, thereby facilitating heat exchange between the channel and the battery cell.

[0019] In some embodiments, the sub-heat exchange channel further includes a third sub-heat exchange channel, which is disposed along a first direction on the side of the second sub-heat exchange channel away from the first sub-heat exchange channel; the heat exchange surface also has a third region, which corresponds to the third sub-heat exchange channel, and the arrangement density of each branch channel in the second sub-heat exchange channel in the second region is greater than the arrangement density of each branch channel in the third sub-heat exchange channel in the third region.

[0020] In this embodiment, a third sub-heat exchange channel is provided on the side of the second sub-heat exchange channel away from the first sub-heat exchange channel, and the arrangement density of the sub-channels in the third sub-heat exchange channel is less than that in the second sub-heat exchange channel, so as to form a channel structure with different arrangement densities at different positions of the refrigerant heat exchange component. Since different positions of the battery cell assembly usually have different temperature change rates, this arrangement enables the refrigerant heat exchange component to exchange heat with different positions of the battery cell assembly at different heat exchange efficiencies, thereby reducing the temperature difference at different positions of the battery cell assembly and improving the temperature uniformity of the battery cell assembly.

[0021] In some embodiments, in the first direction, the first sub-heat exchange channel is located in the middle of the refrigerant heat exchange component, and each second sub-heat exchange channel is arranged on both sides of the first sub-heat exchange channel along the first direction.

[0022] In the technical solution of this embodiment, since the heat dissipation performance of the battery cells in the middle of the battery cell assembly is usually poor, the temperature change rate of the battery cells in the middle of the battery cell assembly is usually faster. Accordingly, the first sub-heat exchange channel is located in the middle of the refrigerant heat exchange component so that the first sub-heat exchange channel corresponds to the middle of the battery cell assembly, thereby enabling the first sub-heat exchange channel to exchange heat with the middle of the battery cell assembly more efficiently.

[0023] In some embodiments, in a first direction, each second sub-heat exchange channel is symmetrically arranged on both sides of the first sub-heat exchange channel.

[0024] In the technical solution of this embodiment, the heat dissipation performance of the battery cell module gradually increases from the middle to both sides, that is, the temperature change rate of the battery cell module gradually slows down from the middle to both sides; accordingly, the second sub-heat exchange flow channel is symmetrically arranged on both sides of the first sub-heat exchange flow channel to adapt to the temperature change rate distribution of the battery cell module.

[0025] In some embodiments, the refrigerant heat exchange component further includes a connector, and the refrigerant heat exchange component also has a transmission channel inside, with each sub-heat exchange channel connected to the connector through the transmission channel; the refrigerant heat exchange medium enters the first sub-heat exchange channel from the connector through the transmission channel along the first path, and the refrigerant heat exchange medium enters the second sub-heat exchange channel from the connector through the transmission channel along the second path, with the length of the first path being less than the length of the second path.

[0026] In this embodiment, the refrigerant enters the first sub-heat exchange channel and the second sub-heat exchange channel via a first path and a second path, respectively, with the length of the first path being less than the length of the second path. In this configuration, the refrigerant can first enter the first sub-heat exchange channel and exchange heat with the corresponding portion of the battery cell assembly. This allows the refrigerant heat exchange component to first exchange heat with the parts of the battery cell assembly where the temperature changes rapidly, and enables the refrigerant heat exchange component to provide heat exchange with varying efficiencies at different locations within the battery cell assembly, thereby improving the temperature uniformity of the battery cell assembly.

[0027] In some embodiments, in the first direction, the connector is located in the middle of the refrigerant heat exchange component.

[0028] In this embodiment, the connector is located in the middle of the refrigerant heat exchange component to further shorten the length of the refrigerant entering the first sub-heat exchange channel from the connector, and to enable the refrigerant to enter the first sub-heat exchange channel more quickly and to exchange heat with the middle of the battery cell assembly more quickly.

[0029] In some embodiments, the flow channel includes an inlet flow channel and a return flow channel, both of which are connected to the transmission flow channel.

[0030] In the technical solution of this embodiment, the inlet and outlet channels of the branch channel are connected to the transmission channel, so that the transmission channel can both allow refrigerant to enter each branch channel and allow refrigerant to flow out from each branch channel.

[0031] In some embodiments, the transmission channel includes an inlet channel and an outlet channel, the inlet channel being connected to each inlet channel and the outlet channel being connected to each loop channel; both the inlet channel and the outlet channel are connected to a connector, and both the first path and the second path are formed within the inlet channel.

[0032] The technical solution of this embodiment provides specific structures for some transmission channels, enabling the refrigerant to enter each branch channel through the inlet channel, and enabling the refrigerant in the branch channel to be discharged from the outlet channel to the outside of the refrigerant heat exchange component.

[0033] In some embodiments, at least a portion of the inlet channel is disposed adjacent to the outlet channel.

[0034] In this embodiment, at least a portion of the inlet channel is arranged adjacent to the outlet channel so that adjacent portions of the inlet and outlet channels can exchange heat, thereby improving the temperature uniformity of the refrigerant heat exchange component.

[0035] In some embodiments, the inlet channel and the return channel are arranged adjacent to each other.

[0036] In this embodiment, the inlet flow channel and the return flow channel are arranged adjacent to each other so that the inlet flow channel and the adjacent return flow channel can exchange heat, thereby further improving the temperature uniformity of the refrigerant heat exchange component.

[0037] In some embodiments, the return flow channel and the inlet flow channel are arranged adjacent to each other in the same sub-heat exchange flow channel.

[0038] The technical solution of this embodiment provides some specific structures in which the inlet flow channel and the return flow channel are arranged adjacently, so that the inlet flow channel and the return flow channel in the same sub-heat exchange flow channel can exchange heat, thereby improving the temperature uniformity of a single sub-heat exchange flow channel.

[0039] In some embodiments, the inlet channel in one sub-heat exchange channel is arranged adjacent to the loop channel in another adjacent sub-heat exchange channel.

[0040] The technical solution of this embodiment provides some specific structures in which the inlet flow channel and the return flow channel are arranged adjacent to each other. This arrangement can reduce the temperature difference between adjacent parts of two adjacent sub-heat exchange channels, thereby further improving the temperature uniformity of the refrigerant heat exchange component.

[0041] In some embodiments, the outlet flow channel includes a main outlet flow channel and a sub-outlet flow channel connected to the main outlet flow channel. The main outlet flow channel is connected to a connector, and the number of sub-outlet flow channels is at least two. Each sub-outlet flow channel is connected to each loop flow channel. Each sub-outlet flow channel is located at the edge of the refrigerant heat exchange component.

[0042] In the technical solution of this embodiment, each sub-outlet flow channel is connected to each sub-return flow channel, and each sub-outlet flow channel is located at the edge of the refrigerant heat exchange component, so as to separate the parts of the refrigerant heat exchange component with the parts of the battery cell assembly with the fastest temperature change, thereby reducing the negative impact of the refrigerant heat exchange component on the temperature uniformity of the battery cell assembly.

[0043] In some embodiments, the heat exchange surface includes an edge region corresponding to at least a portion of each sub-outlet flow channel, and the edge region is offset from the battery cell assembly.

[0044] In the technical solution of this embodiment, the sub-outlet flow channel is staggered from the battery cell assembly, which makes it difficult for the sub-outlet flow channel to exchange heat with the battery cell assembly, thereby further reducing the negative impact of the refrigerant heat exchange component on the temperature uniformity of the battery cell assembly.

[0045] In some embodiments, each sub-outlet channel includes a first channel segment and a second channel segment connected to the first channel segment. The first channel segment is connected to the main outlet channel, and the second channel segment is connected to the corresponding loop channel. Each first channel segment is arranged adjacent to another, and the edge region corresponds to at least each first channel segment.

[0046] The technical solution of this embodiment provides specific structures for some sub-outlet channels so that each channel can be connected to each sub-outlet channel; at the same time, each first channel segment is located at the edge of the refrigerant heat exchange component to reduce the negative impact of the first channel segment on the temperature uniformity of the battery cell assembly.

[0047] Secondly, embodiments of this application also provide a refrigerant heat exchange component, which has a heat exchange channel inside for the refrigerant heat exchange medium to circulate. The heat exchange channel includes at least two sub-heat exchange channels arranged sequentially along a first direction. Each sub-heat exchange channel includes at least two interconnected branch channels, and the branch channels are spaced apart. Each sub-heat exchange channel includes a first sub-heat exchange channel and at least one second sub-heat exchange channel. Each second sub-heat exchange channel is located on one side or opposite sides of the first sub-heat exchange channel. The refrigerant heat exchange component also includes a heat exchange surface corresponding to the heat exchange channel, with the first direction parallel to the heat exchange surface. The heat exchange surface has a first region and a second region. The first region corresponds to the first sub-heat exchange channel, and the second region corresponds to the second sub-heat exchange channel. The arrangement density of each branch channel in the first sub-heat exchange channel in the first region is greater than the arrangement density of each branch channel in the second sub-heat exchange channel in the second region.

[0048] Thirdly, embodiments of this application also provide an energy storage device, including a battery device provided in some embodiments of the first aspect, or a refrigerant heat exchange component provided in some embodiments of the second aspect.

[0049] Fourthly, embodiments of this application also provide an electrical device, including a battery device provided in some embodiments of the first aspect, a refrigerant heat exchange component provided in some embodiments of the second aspect, or an energy storage device provided in the third aspect.

[0050] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0051] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0052] Figure 1 is a structural schematic diagram of a vehicle provided in some embodiments of this application;

[0053] Figure 2 is an exploded structural diagram of a battery device provided in some embodiments of this application;

[0054] Figure 3 is a schematic diagram of the exploded structure of a battery cell provided in some embodiments of this application;

[0055] Figure 4 is a top view of a battery cell assembly and a refrigerant heat exchange component provided in some embodiments of this application;

[0056] Figure 5 is a top view of the battery cell assembly and refrigerant heat exchange component provided in some embodiments of this application.

[0057] Figure 6 is a top view of a refrigerant heat exchange component provided in some embodiments of this application;

[0058] Figure 7 is a top view of a refrigerant heat exchange component provided in some embodiments of this application (II).

[0059] Figure 8 is a schematic diagram of the structure of the first sub-heat exchange channel provided in some embodiments of this application;

[0060] Figure 9 is a schematic diagram of the structure of the second sub-heat exchange channel provided in some embodiments of this application;

[0061] Figure 10 is a schematic diagram of the sub-outlet flow channel provided in some embodiments of this application.

[0062] The markings in the diagram represent the following: 1000, vehicle; 100, battery unit; 10, housing; 11, top cover; 12, frame; 13, bottom plate; 20, battery cell assembly; 21, battery cell; 211, end cap; 212, casing; 213, electrode assembly; 214, electrode terminal. 30. Refrigerant heat exchange component; 31. Heat exchange channel; 311. Sub-heat exchange channel; 311a. First sub-heat exchange channel; 311b. Second sub-heat exchange channel; 3111. Branch channel; 31111. Inlet channel; 31112. Return channel; 32. Heat exchange surface; 321. First zone; 322. Second zone; 323. Edge zone; 33. Connector; 34. Transfer channel; 341. Inlet channel; 342. Outlet channel; 3421. Main outlet channel; 3422. Sub-outlet channel; 34221. First channel section; 34222. Second channel section; 200. Motor; 300. Controller; X. Width direction of battery unit; Y. Length direction of battery unit. Embodiments of the present invention

[0063] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0064] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0065] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0066] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0067] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0068] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0069] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0070] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0071] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0072] In current battery devices, during use, some of the battery cells located on the periphery of the battery assembly can directly exchange heat with the internal space of the battery device. From the periphery to the center of the battery assembly, the temperature of the battery cells increases, and the temperature of the battery cells located in the center of the battery assembly is even higher. The refrigerant heat exchange components have a poor effect on the temperature control of the battery cells in the center of the battery device, and the temperature distribution of battery cells in different locations inside the battery device is uneven and varies greatly.

[0073] Based on the above considerations, in order to alleviate the problem of uneven temperature distribution of battery cells in different locations inside the battery device, this application provides a battery device that includes a battery cell assembly and a refrigerant heat exchange component, wherein the arrangement density of the branch channels in the first sub-heat exchange flow channel of the refrigerant heat exchange component is greater than the arrangement density of the branch channels in the second sub-heat exchange flow channel.

[0074] In such a battery cell, the refrigerant heat exchange component can perform more efficient heat exchange on the parts of the battery cell assembly with faster temperature changes through the first sub-heat exchange channel. This improves the heat exchange capacity of the refrigerant heat exchange component in the corresponding part of the battery cell assembly in the first zone, thereby making the temperature of different parts of the battery cell assembly more uniform, improving the temperature uniformity of the battery cell assembly, and also improving the temperature uniformity performance of the refrigerant heat exchange component.

[0075] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0076] Referring to Figure 1, which is a structural schematic diagram of a vehicle 1000 provided in some embodiments of this application, the vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery is installed inside the vehicle 1000, and the battery can be located at the bottom, front, or rear of the vehicle 1000. The battery can be used to power the vehicle 1000; for example, the battery can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 300 and a motor 200. The controller 300 is used to control the battery to supply power to the motor 200, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0077] In some embodiments of this application, the battery can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0078] Referring to Figure 2, which is an exploded structural diagram of a battery device 100 provided in some embodiments of this application.

[0079] The battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies 20 for providing voltage and capacity. The battery cell assembly 20 may include multiple battery cells 21, which are connected in series, parallel, or mixed connection via a busbar.

[0080] In some embodiments, the battery cell assembly 20 is typically formed by arranging a plurality of battery cells 21.

[0081] As an example, the battery cell assembly 20 can be a battery module, which is formed by arranging and fixing multiple battery cells 21 together. As an example, the battery module can be formed by bundling multiple battery cells 21 together with cable ties.

[0082] In some embodiments, the battery device 100 may be a battery pack, which includes a housing 10 and one or more battery cell assemblies 20, the battery cell assemblies 20 being housed within the housing 10.

[0083] As an example, the battery cell assembly 20 can be a battery module, which can be housed in the housing 10 by fixing the battery module in the housing 10.

[0084] As an example, the battery cell assembly 20 can also be housed in the housing 10 by directly fixing multiple battery cells 21 to the housing 10.

[0085] As an example, the housing 10 may include a first housing and a second housing. The first housing and the second housing are fastened together to form a closed space inside the housing 10 to house the battery cell assembly 20. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing may be a top cover 11 or a bottom plate 13.

[0086] As an example, the housing 10 may include a top cover 11, a side frame 12, and a bottom plate 13. The top cover 11 and the bottom plate 13 are respectively connected to the side frame 12, so that the interior of the housing 10 forms a closed space to accommodate the battery cell assembly 20.

[0087] In some embodiments, the housing 10 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 10 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0088] Referring to Figure 3, which is an exploded structural diagram of a battery cell 21 provided in some embodiments of this application, a battery cell 21 refers to the smallest unit that makes up a battery. A battery cell 21 can be a rechargeable battery, meaning that after the battery cell 21 has been discharged, the active materials can be activated by charging to continue its use.

[0089] The battery cell 21 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0090] As shown in the figure, the battery cell 21 includes an end cap 211, a housing 212, an electrode assembly 213, and other functional components.

[0091] End cap 211 refers to a component that covers the opening of housing 212 to isolate the internal environment of battery cell 21 from the external environment. The shape of end cap 211 can be adapted to the shape of housing 212 to fit it. Optionally, end cap 211 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 211 is not easily deformed under pressure and impact, giving battery cell 21 higher structural strength and improved safety performance. Functional components such as electrode terminals 214 can be provided on end cap 211. Electrode terminals 214 can be used for electrical connection with electrode assembly 213 for outputting or inputting electrical energy to battery cell 21. In some embodiments, end cap 211 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 21 reaches a threshold. The material of end cap 211 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating element may be provided on the inner side of the end cap 211. The insulating element can be used to isolate the electrical connection components within the housing 212 from the end cap 211 to reduce the risk of short circuits. For example, the insulating element may be made of plastic, rubber, etc.

[0092] The housing 212 is a component used to cooperate with the end cap 211 to form the internal environment of the battery cell 21. This internal environment can accommodate the electrode assembly 213, electrolyte, and other components. The housing 212 and the end cap 211 can be independent components. An opening can be provided on the housing 212, and the end cap 211 can be used to close the opening to form the internal environment of the battery cell 21. Alternatively, the end cap 211 and the housing 212 can be integrated. Specifically, the end cap 211 and the housing 212 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 212, the end cap 211 closes the housing 212. The housing 212 can have various shapes and sizes, such as cuboid, cylindrical, or hexagonal prism. Specifically, the shape of the housing 212 can be determined according to the specific shape and size of the electrode assembly 213. The shell 212 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special restrictions on this.

[0093] Electrode assembly 213 is the component in the battery cell 21 where the electrochemical reaction occurs. The casing 212 may contain one or more electrode assemblies 213. The electrode assembly 213 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly 213, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals 214 to form a current loop.

[0094] In a first aspect, referring to Figures 2, 4 to 6, an embodiment of this application provides a battery device 100, including a battery cell assembly 20 and a refrigerant heat exchange component 30. The refrigerant heat exchange component 30 has a heat exchange channel 31 for the flow of the refrigerant heat exchange medium. The heat exchange channel 31 includes at least two sub-heat exchange channels 311 arranged sequentially along a first direction. Each sub-heat exchange channel 311 includes at least two interconnected branch channels 3111, which are spaced apart. Each sub-heat exchange channel 311 includes a first sub-heat exchange channel 311a and at least one second sub-heat exchange channel 311b, with each second sub-heat exchange channel 311b located on one side or opposite sides of the first sub-heat exchange channel 311a. The refrigerant heat exchange... Component 30 also includes a heat exchange surface 32 corresponding to the heat exchange channel 31, with a first direction parallel to the heat exchange surface 32, and the heat exchange surface 32 is disposed close to or in contact with the battery cell assembly 20; the heat exchange surface 32 has a first region 321 and a second region 322, the first region 321 corresponds to the first sub-heat exchange channel 311a, and the second region 322 corresponds to the second sub-heat exchange channel 311b, the arrangement density of each branch channel 3111 in the first sub-heat exchange channel 311a in the first region 321 is greater than the arrangement density of each branch channel 3111 in the second sub-heat exchange channel 311b in the second region 322.

[0095] In the figure, the X-axis is the width direction of the battery device 100, and the Y-axis is the length direction Y of the battery device 100.

[0096] A battery cell assembly 20 refers to a structure formed by arranging multiple battery cells 21. Multiple battery cells 21 can be arranged in one direction to form a battery cell assembly 21, and multiple battery cell assemblies 20 can also be arrayed in different directions to form a battery cell assembly 20.

[0097] A battery cell 21 refers to the smallest unit that makes up the battery device 100. A battery cell 21 can be a cylindrical structure, a prismatic structure, a sheet structure, or other shapes. The number of battery cells 21 can be one, two or more. When there are multiple battery cells 21, the multiple battery cells 21 can be arranged in one or two different directions. The multiple battery cells 21 can be connected in series, in parallel or in a mixed manner.

[0098] The refrigerant heat exchange component 30 is a structure in the battery device 100 used for heat exchange with the battery cells 21. The number of refrigerant heat exchange components 30 can be one, two or more. When there are multiple battery cells 21, the number of refrigerant heat exchange components 30 can be one, and the refrigerant heat exchange component 30 exchanges heat with each battery cell 21 to control the temperature of each battery cell 21. When there are multiple battery cells 21, the number of refrigerant heat exchange components 30 can also be two or more, in which case one refrigerant heat exchange component 30 can exchange heat with one or more battery cells 21 in the same row or column.

[0099] The refrigerant heat exchange component 30 can be connected to the housing 10. The refrigerant heat exchange component 30 can be fixedly connected to the housing 10 by welding, bonding or other means, or it can be detachably connected to the housing 10 by snap-fit, screw-fit or other means. The refrigerant heat exchange component 30 can be directly connected to the housing 10, or it can be indirectly connected to the housing 10 through an intermediate structure. The refrigerant heat exchange component 30 can be located inside the housing 10 or outside the housing 10. The refrigerant heat exchange component 30 can be located at the bottom or top of each battery cell 21, or it can be located between two adjacent battery cells 21. The material of the refrigerant heat exchange component 30 can include metal, plastic or other materials.

[0100] The heat exchange channel 31 refers to the structure in the refrigerant heat exchange component 30 used for the flow of refrigerant; the heat exchange channel 31 may include a pipe structure, which may be serpentine, spiral, or other shapes; the heat exchange channel 31 may also include a channel structure set in the base component, which refers to the structure in the refrigerant heat exchange component 30 used to provide an installation base for other structures. The base component may be a plate structure, block structure, or other structure, and the shape of the base component may be rectangular plate, prism, cylinder, or other shapes. The channel structure formed in the base component may be a serpentine channel, spiral channel, or other shaped channel.

[0101] The substance flowing in the heat exchange channel 31 is a refrigerant. The refrigerant can exchange heat with the battery cell 21 or other structures other than the refrigerant heat exchange component 30. The refrigerant can include liquid media, gaseous media, solid-liquid mixture media, etc. The refrigerant can include refrigerants, for example, the refrigerant can include tetrafluoroethane, difluoromethane, pentafluoroethane, etc.

[0102] Sub-heat exchange channel 311 refers to the part of heat exchange channel 31 used for heat exchange with battery cell 21. The refrigerant can exchange heat with battery cell 21 within the sub-heat exchange channel 311. The number of sub-heat exchange channels 311 is at least two, that is, there can be two, three or more sub-heat exchange channels 311. The sub-heat exchange channels 311 can be directly connected to each other, or indirectly connected through other channel structures. The sub-heat exchange channels 311 can be connected in parallel, in series or in a mixed manner.

[0103] At least two sub-heat exchange channels 311 are arranged sequentially along a first direction, which can be the length direction Y of the battery device 100, the width direction X of the battery device 100, or other directions; for example, the first direction is the width direction X of the battery device 100.

[0104] The branch channel 3111 refers to a part of the sub-heat exchange channel 311. The refrigerant can flow in the branch channel 3111 and exchange heat with the battery cell 21 in the branch channel 3111. A sub-heat exchange channel 311 includes at least two branch channels 3111, that is, a sub-heat exchange channel 311 can include two branch channels 3111, or it can include three or more branch channels 3111. The branch channels 3111 of the same sub-heat exchange channel 311 are interconnected so that the refrigerant can enter each branch channel 3111 of the same sub-heat exchange channel 3111. The branch channels 3111 of the same sub-heat exchange channel 311 can be interconnected by series, parallel or mixed connection. The branch channels 3111 are spaced apart. The branch channels 3111 can be spaced apart along a first direction or along other directions.

[0105] The sub-heat exchange flow channel 311 includes a first sub-heat exchange flow channel 311a and a second sub-heat exchange flow channel 311b. When there are two sub-heat exchange flow channels 311, the two sub-heat exchange flow channels 311 can be referred to as the first sub-heat exchange flow channel 311a and the second sub-heat exchange flow channel 311b, respectively. When there are three or more sub-heat exchange flow channels 311, each sub-heat exchange flow channel 311 can include one first sub-heat exchange flow channel 311a, one second sub-heat exchange flow channel 311b and other flow channels, or it can include two or more second sub-heat exchange flow channels 311b.

[0106] Because the refrigerant can exchange heat with the battery cell 21 in each sub-heat exchange channel 311, when the sub-heat exchange channel 311 includes a first sub-heat exchange channel 311a and a second sub-heat exchange channel 311b, the refrigerant can exchange heat with the battery cells 21 at different positions of the battery cell assembly 20 in the first sub-heat exchange channel 311a and the second sub-heat exchange channel 311b.

[0107] Depending on the number of second sub-heat exchange channels 311b, if there is only one second sub-heat exchange channel 311b, the second sub-heat exchange channel 311b is located on one side of the first sub-heat exchange channel 311a; if there are two or more second sub-heat exchange channels 311b, the multiple second sub-heat exchange channels 311b can be located on opposite sides of the first sub-heat exchange channel 311a respectively.

[0108] The heat exchange surface 32 refers to the surface in the refrigerant heat exchange component 30 that corresponds to the heat exchange channel 31. Depending on the position and connection between the refrigerant heat exchange component 30 and the battery cell assembly 20, the heat exchange surface 32 can be close to the battery cell assembly 20, or it can be in direct contact with the battery cell assembly 20. In this case, the refrigerant can exchange heat with the battery cell 21 at the heat exchange surface 32. When the heat exchange channel 31 is formed in the base component, the heat exchange surface 32 is the surface of the base component facing the battery cell assembly 20.

[0109] The first region 321 refers to a portion of the heat exchange surface 32. The first region 321 corresponds to the first sub-heat exchange channel 311a, meaning that the first sub-heat exchange channel 311a can exchange heat with the battery cell assembly 20 at the first region 321. In other words, the portion of the battery cell 21 in the battery cell assembly 20 corresponding to the first region 321 can exchange heat with the first sub-heat exchange channel 311a. The first region 321 can be a region set on the heat exchange surface 32, or it can be a region enclosed on the heat exchange surface 32 by a structure. The shape of the first region 321 can be square, circular, or other shapes.

[0110] Similar to the first region 321, the second region 322 corresponds to the second sub-heat exchange channel 311b, that is, the second sub-heat exchange channel 311b can exchange heat with the battery cell assembly 20 at the second region 322, that is, the part of the battery cell 21 in the battery cell assembly 20 corresponding to the second region 322 can exchange heat with the second sub-heat exchange channel 311b; the second region 322 can be a region set on the heat exchange surface 32, or it can be a region enclosed on the heat exchange surface 32 by a structure; the shape of the second region 322 can be square, circular or other shapes.

[0111] The arrangement density of each branch channel 3111 in the first sub-heat exchange channel 311a within the first region 321 reflects the heat exchange performance of the first sub-heat exchange channel 311a. The greater the arrangement density, the greater the amount of refrigerant in the first sub-heat exchange channel 311a per unit time, and the stronger the heat exchange capacity of the first sub-heat exchange channel 311a. The arrangement density is directly proportional to the number of each branch channel 3111 in the first sub-heat exchange channel 311a per unit space.

[0112] The arrangement density of each branch channel 3111 in the second sub-heat exchange channel 311b within the second zone 322 reflects the heat exchange performance of the second sub-heat exchange channel 311b. The greater the arrangement density, the greater the amount of refrigerant in the second sub-heat exchange channel 311b per unit time, and the stronger the heat exchange capacity of the second sub-heat exchange channel 311b. The arrangement density is directly proportional to the number of each branch channel 3111 in the second sub-heat exchange channel 311b per unit space.

[0113] The arrangement density of each branch channel 3111 in the first sub-heat exchange channel 311a in the first region 321 is greater than the arrangement density of each branch channel 3111 in the second sub-heat exchange channel 311b in the second region 322. That is, the heat exchange performance of the refrigerant heat exchange component 30 in the first region 321 is stronger than that in the second region 322. When the refrigerant heat exchange component 30 is used to dissipate heat and cool down the battery cell assembly 20, the heat dissipation performance of the refrigerant heat exchange component 30 in the first region 321 is stronger than that in the second region 322.

[0114] In the battery cell assembly 20, for the battery cell 21 located in the middle of the battery cell assembly 20, there are battery cells 21 all around this part of the cell, making it difficult for the heat of this part of the cell to dissipate to the environment. At the same time, some of the heat from the surrounding battery cells 21 is also conducted to this part of the battery cell 21, resulting in a faster temperature rise and a higher temperature for this part of the battery cell 21. During the operation of the battery cell assembly 20, the heat dissipation performance of the battery cell 21 located in the middle of the battery cell assembly 20 is weaker than that of the battery cells 21 located at the edge of the battery cell assembly 20, and the temperature of the battery cell 21 located in the middle of the battery cell assembly 20 is higher than that of the battery cells 21 located at the edge of the battery cell assembly 20. That is, during the operation of the battery cell assembly 20, the temperature rise rate and temperature are different at different locations in the battery cell assembly 20. This can easily cause at least some of the battery cells 21 in the battery cell assembly 20 to fail to operate at a suitable temperature, which can negatively affect the efficiency of the entire battery device 100.

[0115] At this time, the middle part of the battery cell assembly 20 can be aligned with the first region 321, so that the first sub-heat exchange channel 311a with higher heat exchange efficiency can exchange heat with the middle part of the battery cell assembly 20, and the second sub-heat exchange channel 311b can exchange heat with other parts of the battery cell assembly 20. Because the heat exchange efficiency of the first sub-heat exchange channel 311a is higher than that of the second sub-heat exchange channel 311b, during the operation of the refrigerant heat exchange component 30, the first sub-heat exchange channel 311a can make the corresponding battery cell 21 cool down faster than the corresponding battery cell 21 in the second sub-heat exchange channel 311b. This makes the temperature areas of different parts of the battery cell assembly 20 more uniform, thereby improving the temperature uniformity of the battery cell assembly 20 during operation and also improving the temperature uniformity performance of the refrigerant heat exchange component 30.

[0116] In this embodiment, the heat exchange channel 31 includes a first sub-heat exchange channel 311a and at least one second sub-heat exchange channel 311b. The arrangement density of the branch channels 3111 in the first sub-heat exchange channel 311a in the first region 321 is greater than the arrangement density of the branch channels 3111 in the second sub-heat exchange channel 311b in the second region 322. This improves the heat exchange capability of the refrigerant heat exchange component 30 in the first region 321 corresponding to a portion of the battery cell assembly 20, allowing for better heat exchange with the parts of the battery cell assembly 20 where the temperature changes rapidly. This results in a more uniform temperature distribution in different parts of the battery cell assembly 20, thus improving the temperature uniformity of the battery cell assembly 20.

[0117] In some embodiments, the ratio of the arrangement density of each branch channel 3111 in the first sub-heat exchange channel 311a in the first region 321 to the arrangement density of each branch channel 3111 in the second sub-heat exchange channel 311b in the second region 322 ranges from 1.5 to 4.

[0118] The arrangement density of each branch channel 3111 in the first sub-heat exchange channel 311a within the first region 321 is the ratio of the sum of the projected areas of each branch channel 3111 within the first region 321 to the area of ​​the first region 321; this arrangement density is called the first arrangement density, which reflects the heat exchange performance of the first sub-heat exchange channel 311a within the first region 321.

[0119] The arrangement density of each branch channel 3111 in the second sub-heat exchange channel 311b within the second zone 322 is the ratio of the sum of the projected areas of each branch channel 3111 within the second zone 322 to the area of ​​the second zone 322; this arrangement density is called the second arrangement density, which reflects the heat exchange performance of the second sub-heat exchange channel 311b within the second zone 322.

[0120] The ratio of the first row density to the second row density ranges from 1.5 to 4. For example, the ratio can be 1.5, 2, 2.5, 3, 3.5, 4 or other values.

[0121] The ratio of the first row density to the second row density can be set according to the temperature difference at different positions in the battery cell assembly 20 corresponding to the first zone 321 and the second zone 322, so as to reduce the temperature difference at different positions in the battery cell assembly 20, improve the temperature uniformity of the battery cell assembly 20, and improve the temperature uniformity performance of the refrigerant heat exchange component 30.

[0122] This embodiment provides a range of ratios between the density of the branch channels 3111 in the first sub-heat exchange channel 311a and the density of the sub-channels in the second sub-heat exchange channel 311b, so that the first sub-heat exchange channel 311a can have better heat exchange capacity in the first region 321, so that the refrigerant heat exchange component 30 can perform more efficient heat exchange on the parts of the battery cell assembly 20 where the temperature changes rapidly, thereby improving the temperature uniformity of the battery cell assembly 20.

[0123] Referring to Figures 6, 8, and 9, in some embodiments, the branch channels 3111 in the first sub-heat exchange channel 311a are arranged at a first interval, and the branch channels 3111 in the second sub-heat exchange channel 311b are arranged at a second interval, wherein the first interval is smaller than the second interval.

[0124] Each branch channel 3111 in the first sub-heat exchange channel 311a is arranged at a first spacing, wherein the first spacing refers to the spacing between two adjacent branch channels 3111 in the first sub-heat exchange channel 311a; referring to Figure 8, the dimension shown by L1 in the figure is the first spacing. The first spacing is negatively correlated with the arrangement density of each branch channel 3111 in the first sub-heat exchange channel 311a in the first region 321. The smaller the first spacing, the greater the arrangement density of each branch channel 3111 in the first sub-heat exchange channel 311a in the first region 321.

[0125] Each branch channel 3111 in the second sub-heat exchange channel 311b is arranged at a second spacing, where the second spacing refers to the distance between two adjacent branch channels 3111 in the second sub-heat exchange channel 311b; referring to Figure 9, the dimension shown in L2 in the figure is the second spacing. The second spacing is negatively correlated with the arrangement density of each branch channel 3111 in the second sub-heat exchange channel 311b in the second region 322. The larger the second spacing, the smaller the arrangement density of each branch channel 3111 in the second sub-heat exchange channel 311b in the second region 322.

[0126] The first spacing is made smaller than the second spacing, so that the arrangement density of each branch channel 3111 in the first sub-heat exchange channel 311a in the first region 321 is greater than the arrangement density of each branch channel 3111 in the second sub-heat exchange channel 311b in the second region 322.

[0127] In this embodiment, the spacing between the branch channels 3111 in the first sub-heat exchange channel 311a is smaller than the spacing between the branch channels 3111 in the second sub-heat exchange channel 311b, so that the arrangement density of the branch channels 3111 in the first sub-heat exchange channel 311a in the first region 321 is greater than the arrangement density of the branch channels 3111 in the second sub-heat exchange channel 311b in the second region 322. This allows the refrigerant heat exchange component 30 to perform more efficient heat exchange on the parts of the battery cell assembly 20 where the temperature changes rapidly, thereby improving the temperature uniformity of the battery cell assembly 20.

[0128] Referring to Figures 6 and 8, in some embodiments, the first spacing ranges from 2 mm to 7 mm.

[0129] The first spacing ranges from 2mm to 7mm, that is, the size range of LI in Figure 8 is 2mm to 7mm; for example, the size of the first spacing can be 2mm, 3mm, 4mm, 5mm, 6mm, 7mm or other values.

[0130] For example, the first spacing can be 2mm. At this time, the spacing between each branch channel 3111 in the first sub-heat exchange channel 311a is small, the arrangement density of each branch channel 3111 in the first region 321 is high, and the heat exchange efficiency of the first sub-heat exchange channel 311a is high.

[0131] For example, the first spacing can be 4.5mm. At this time, the spacing between each branch channel 3111 in the first sub-heat exchange channel 311a is moderate, the heat exchange efficiency of the first sub-heat exchange channel 311a is high, and the processing difficulty of each branch channel 3111 in the first sub-heat exchange channel 311a is low.

[0132] For example, the first spacing can be 7mm. At this time, the spacing between each branch channel 3111 in the first sub-heat exchange channel 311a is larger, and the processing difficulty of each branch channel 3111 in the first sub-heat exchange channel 311a is lower.

[0133] This embodiment provides a range of first spacings to make the spacing between each branch channel 3111 in the first sub-heat exchange channel 311a smaller, thereby enabling a larger arrangement density of the branch channels 3111 in the first region 321 and achieving higher heat exchange efficiency.

[0134] Referring to Figures 6 and 9, in some embodiments, the second spacing ranges from 20 mm to 30 mm.

[0135] The second spacing ranges from 20mm to 30mm, that is, the size range of L2 in Figure 9 is 20mm to 30mm; for example, the size of the second spacing can be 20mm, 22mm, 24mm, 26mm, 28mm, 30mm or other values.

[0136] For example, the second spacing can be 20mm. At this time, the spacing between each branch channel 3111 in the second sub-heat exchange channel 311b is small, the arrangement density of each branch channel 3111 in the second zone 322 is high, and the heat exchange efficiency of the second sub-heat exchange channel 311b is high.

[0137] For example, the second spacing can be 25mm. At this time, the spacing between each branch channel 3111 in the second sub-heat exchange channel 311b is moderate, the heat exchange efficiency of the second sub-heat exchange channel 311b is high, and the processing difficulty of each branch channel 3111 in the second sub-heat exchange channel 311b is low.

[0138] For example, the second spacing can be 30mm. In this case, the spacing between each branch channel 3111 in the second sub-heat exchange channel 311b is larger, and the processing difficulty of each branch channel 3111 in the second sub-heat exchange channel 311b is lower.

[0139] This embodiment provides a range of second spacings so that the spacing between each branch channel 3111 in the second sub-heat exchange channel 311b can be greater than the spacing between each branch channel 3111 in the first sub-heat exchange channel 311a, thereby making the arrangement density of the branch channels 3111 in the first sub-heat exchange channel 311a in the first region 321 greater than the arrangement density of the branch channels 3111 in the second sub-heat exchange channel 311b in the second region 322.

[0140] In some embodiments, the width of the diversion channel 3111 ranges from 5 mm to 12 mm.

[0141] The width of the manifold 3111 refers to the dimension of the manifold 3111 perpendicular to the direction of refrigerant flow. The width of the manifold 3111 ranges from 5mm to 12mm. For example, the width of the manifold 3111 can be 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm or other values.

[0142] The width of the flow channel 3111 is related to the flow velocity and flow resistance of the refrigerant within the flow channel 3111. The wider the flow channel 3111, the lower the flow velocity of the refrigerant, the greater the flow resistance, and the greater the pressure loss. At the same time, the width of the flow channel 3111 is also related to the processing difficulty. The smaller the width of the flow channel 3111, the greater the processing difficulty.

[0143] For example, the width of the flow channel 3111 can be 5mm. In this case, the width of the flow channel 3111 is small, the flow resistance of the refrigerant in the flow channel 3111 is small, the pressure loss is small, and the heat exchange performance of the refrigerant in the flow channel 3111 is better.

[0144] For example, the width of the distribution channel 3111 can be 8.5mm. At this width, the distribution channel 3111 is moderate, and the heat exchange performance of the refrigerant in the distribution channel 3111 is good.

[0145] For example, the width of the runner 3111 can be 12mm. In this case, the width of the runner 3111 is relatively large, and the processing difficulty is relatively low.

[0146] This embodiment provides a range of widths for some flow channels 3111 so that a certain heat exchange area can be provided between a single flow channel 3111 and the battery cell 21, thereby facilitating heat exchange between the flow channel 3111 and the battery cell 21.

[0147] Referring to Figure 6, in some embodiments, the sub-heat exchange channel 311 further includes a third sub-heat exchange channel 311, which is disposed along a first direction on the side of the second sub-heat exchange channel 311b away from the first sub-heat exchange channel 311a; the heat exchange surface 32 also has a third region, which corresponds to the third sub-heat exchange channel 311, and the arrangement density of each branch channel 3111 in the second sub-heat exchange channel 311b in the second region 322 is greater than the arrangement density of each branch channel 3111 in the third sub-heat exchange channel 311 in the third region.

[0148] There are at least two sub-heat exchange channels 311. When there are three or more sub-heat exchange channels 311, the sub-heat exchange channels 311 may include a first sub-heat exchange channel 311a and a second sub-heat exchange channel 311b. The sub-heat exchange channels 311 may also include a third sub-heat exchange channel 311. Depending on the number of sub-heat exchange channels 311, the number of third sub-heat exchange channels 311 may be one, two, or three. The refrigerant can exchange heat with the adjacent battery cell 21 in the third sub-heat exchange channel 311.

[0149] The third sub-heat exchange channel 311 is located on the side of the second sub-heat exchange channel 311b away from the first sub-heat exchange channel 311a. When the second sub-heat exchange channel 311b is located on the side of the first sub-heat exchange channel 311a, the third sub-heat exchange channel 311 and the second sub-heat exchange channel 311b are located on the same side of the first sub-heat exchange channel 311a, and the second sub-heat exchange channel 311b and the third sub-heat exchange channel 311 are arranged in a direction away from the first sub-heat exchange channel 311a. On the same side of the first sub-heat exchange channel 311a, the number of second sub-heat exchange channels 311b can be one, two or more, and similarly, the number of third sub-heat exchange channels 311 can also be one, two or more.

[0150] The third zone refers to a portion of the heat exchange surface 32. The third zone corresponds to the third sub-heat exchange channel 311, meaning that the third sub-heat exchange channel 311 can exchange heat with the battery cell assembly 20 at the third zone. In other words, the portion of the battery cell 21 in the battery cell assembly 20 corresponding to the third zone can exchange heat with the third sub-heat exchange channel 311. The third zone can be a region set on the heat exchange surface 32, or it can be a region enclosed on the heat exchange surface 32 by a structure. The shape of the third zone can be square, circular, or other shapes.

[0151] The arrangement density of each branch channel 3111 in the third sub-heat exchange channel 311 within the third zone reflects the heat exchange performance of the third sub-heat exchange channel 311. The greater the arrangement density, the greater the amount of refrigerant in the third sub-heat exchange channel 311 per unit time, and the stronger the heat exchange capacity of the third sub-heat exchange channel 311. The arrangement density is directly proportional to the number of each branch channel 3111 in the third sub-heat exchange channel 311 per unit space.

[0152] The arrangement density of each branch channel 3111 in the second sub-heat exchange channel 311b in the second region 322 is greater than the arrangement density of each branch channel 3111 in the third sub-heat exchange channel 311 in the third region. That is, the heat exchange performance of the refrigerant heat exchange component 30 in the second region 322 is stronger than that in the third region. When the refrigerant heat exchange component 30 is used to dissipate heat and cool down the battery cell assembly 20, the heat dissipation performance of the refrigerant heat exchange component 30 in the second region 322 is stronger than that in the third region.

[0153] Because the arrangement density of the first sub-heat exchange channel 311a in the first zone 321 is greater than that of the second sub-heat exchange channel 311b in the second zone 322, the arrangement density of the first sub-heat exchange channel 311a in the first zone 321 is also greater than that of each branch channel 3111 in the third sub-heat exchange channel 311 in the third zone. That is, the heat dissipation performance of the refrigerant heat exchange component 30 in the first zone 321 is stronger than that in the third zone. In other words, the heat exchange performance of the refrigerant heat exchange component 30 gradually decreases in the first zone 321, the second zone 322 and the third zone.

[0154] The first zone 321, the second zone 322, and the third zone correspond to different positions of the battery cell module 20. The first sub-heat exchange channel 311a, the second sub-heat exchange channel 311b, and the third sub-heat exchange channel 311 can perform targeted heat exchange for different positions of the battery cell module 20, thereby improving the heat exchange efficiency and temperature uniformity of the refrigerant heat exchange component 30.

[0155] Understandably, in addition to the third sub-heat exchange channel 311, the sub-heat exchange channel 311 may also include a fourth sub-heat exchange channel 311, a fifth sub-heat exchange channel 311, etc., with decreasing arrangement density. In the direction from the first sub-heat exchange channel 311a away from the first sub-heat exchange channel 311a, this arrangement can form a sub-channel arrangement structure with gradually decreasing heat exchange performance to adapt to the temperature arrangement law in the battery cell module 20.

[0156] In this embodiment, a third sub-heat exchange channel 311 is provided on the side of the second sub-heat exchange channel 311b away from the first sub-heat exchange channel 311a, and the arrangement density of the branch channels 3111 in the third sub-heat exchange channel 311 is less than the arrangement density of the branch channels 3111 in the second sub-heat exchange channel 311b, so as to form a channel structure with different arrangement densities at different positions of the refrigerant heat exchange component 30. Since different positions of the battery cell assembly 20 usually have different temperature change rates, this arrangement enables the refrigerant heat exchange component 30 to exchange heat with different positions of the battery cell assembly 20 with different heat exchange efficiencies, thereby reducing the temperature difference at different positions of the battery cell assembly 20 and improving the temperature uniformity of the battery cell assembly 20.

[0157] Referring to FIG6, in some embodiments, in the first direction, the first sub-heat exchange channel 311a is located in the middle of the refrigerant heat exchange component 30, and each second sub-heat exchange channel 311b is arranged on both sides of the first sub-heat exchange channel 311a along the first direction.

[0158] Since each sub-heat exchange channel 311 is arranged along the first direction, the first sub-heat exchange channel 311a is located in the middle of the refrigerant heat exchange component 30, that is, the first sub-heat exchange channel 311a is located in the middle of the refrigerant heat exchange component 30 along the first direction; the refrigerant heat exchange component 30 is correspondingly arranged with the battery cell assembly 20, and the middle of the refrigerant heat exchange component 30 corresponds to the middle of the battery cell assembly 20, that is, the first sub-heat exchange channel 311a corresponds to the middle of the battery cell assembly 20.

[0159] During the operation of the battery cell module 20, the temperature in the middle of the battery cell module 20 usually changes faster and the temperature in the middle of the battery cell module 20 is usually higher. The heat exchange efficiency of the first sub-heat exchange channel 311a is higher than that of the second sub-heat exchange channel 311b. Therefore, the first sub-heat exchange channel 311a is aligned with the middle of the battery cell module 20 to better control the temperature in the middle of the battery cell module 20.

[0160] The second sub-heat exchange channel 311b is arranged along the first direction on both sides of the first sub-heat exchange channel 311a. That is, at least one second sub-heat exchange channel 311b is provided on both sides of the first sub-heat exchange channel 311a along the first direction. The number of second sub-heat exchange channels 311b on both sides of the first sub-heat exchange channel 311a can be the same or different.

[0161] During the operation of the battery cell assembly 20, the temperature change rate on the two adjacent sides of the middle part of the battery cell assembly 20 is slower than the temperature change rate in the middle part. The heat exchange efficiency of the second sub-heat exchange channel 311b is lower than that of the first sub-heat exchange channel 311a. Therefore, the second sub-heat exchange channel 311b is set on both sides of the first sub-heat exchange channel 311a so that the second sub-heat exchange channel 311b corresponds to the part on the two adjacent sides of the middle part of the battery cell assembly 20.

[0162] In this embodiment, because the heat dissipation performance of the battery cell 21 in the middle of the battery cell assembly 20 is usually poor, the temperature change rate of the battery cell 21 in the middle of the battery cell assembly 20 is usually faster. Accordingly, the first sub-heat exchange channel 311a is located in the middle of the refrigerant heat exchange component 30, so that the first sub-heat exchange channel 311a corresponds to the middle of the battery cell assembly 20, thereby enabling the first sub-heat exchange channel 311a to exchange heat with the middle of the battery cell assembly 20 more efficiently. At the same time, the second sub-heat exchange channel 311b corresponds to the part of the battery cell assembly 20 where the temperature change rate is relatively slow, so as to reduce the temperature difference at different locations of the battery cell assembly 20, improve the temperature uniformity of the battery cell assembly 20, and also improve the temperature uniformity performance of the refrigerant heat exchange component 30.

[0163] Referring to Figure 6, in some embodiments, in a first direction, each second sub-heat exchange channel 311b is symmetrically arranged on both sides of the first sub-heat exchange channel 311a.

[0164] Each second sub-heat exchange channel 311b is symmetrically arranged on both sides of the first sub-heat exchange channel 311a. That is, the number of second sub-heat exchange channels 311b on both sides of the first sub-heat exchange channel 311a is the same, and the spacing between the symmetrical second sub-heat exchange channels 311b on both sides of the first sub-heat exchange channel 311a and the first sub-heat exchange channel 311a is also the same.

[0165] Since the temperature distribution on the battery cell assembly 20 is usually quite regular, each second sub-heat exchange channel 311b is symmetrically arranged on both sides of the first sub-heat exchange channel 311a so that the arrangement of each sub-heat exchange channel 311 can be adapted to the temperature distribution pattern on the battery cell assembly 20, thereby improving the temperature uniformity performance of the refrigerant heat exchange component 30.

[0166] In this embodiment, the heat dissipation performance of the battery cell assembly 20 gradually increases from the middle to both sides, that is, the temperature change rate of the battery cell assembly 20 gradually slows down from the middle to both sides; accordingly, the second sub-heat exchange channel 311b is symmetrically arranged on both sides of the first sub-heat exchange channel 311a to adapt to the temperature change rate distribution of the battery cell assembly 20.

[0167] Referring to Figures 4 to 6, in some embodiments, the refrigerant heat exchange component 30 further includes a connector 33, and the refrigerant heat exchange component 30 also has a transmission channel 34 inside. Each sub-heat exchange channel 311 is connected to the connector 33 through the transmission channel 34. The refrigerant heat exchange medium enters the first sub-heat exchange channel 311a from the connector 33 via the transmission channel 34 along the first path, and the refrigerant heat exchange medium enters the second sub-heat exchange channel 311b from the connector 33 via the transmission channel 34 along the second path. The length of the first path is less than the length of the second path.

[0168] Connector 33 refers to the structure in the refrigerant heat exchange component 30 that connects to external devices. The external devices can be refrigerant storage devices, pressurizing devices, or other devices. Refrigerant can enter the refrigerant heat exchange component 30 from the external devices through connector 33, and refrigerant can also flow from the refrigerant heat exchange component 30 to the external devices through connector 33. When the refrigerant heat exchange component 30 includes a base component, connector 33 can be connected to the base component by bonding, welding, screwing, or other means. Connector 33 can be connected to the corresponding external devices by plugging, screwing, or other means. The material of connector 33 can include metal, plastic, or other materials.

[0169] The transmission channel 34 refers to the structure in the refrigerant heat exchange component 30 used for the flow of refrigerant; the transmission channel 34 may include a pipe structure, which may be serpentine, spiral, or other shapes; the transmission channel 34 may also include a channel structure set in the base component, which refers to the structure in the refrigerant heat exchange component 30 used to provide an installation base for other structures. The base component may be a plate structure, block structure, or other structure, and the shape of the base component may be rectangular plate, prism, cylinder, or other shapes. The channel structure formed in the base component may be a serpentine channel, spiral channel, or other shaped channel.

[0170] During the flow of the refrigerant in the transmission channel 34, it may not exchange heat with the external environment or the battery cell 21. At this time, the transmission channel 34 is mainly used to transmit the refrigerant. During the flow of the refrigerant in the transmission channel 34, it may also exchange heat with the adjacent battery cell 21. At this time, the transmission channel 34 can also be used to control the temperature of the battery cell 21.

[0171] Each sub-heat exchange channel 311 is connected to the connector 33 through the transmission channel 34. That is, the refrigerant can enter each sub-heat exchange channel 311 from the connector 33 through the transmission channel 34, and the refrigerant in each sub-heat exchange channel 311 can also flow to the connector 33 through the transmission channel 34 to realize the input and output of the refrigerant.

[0172] The first path refers to the refrigerant flow path set in the transmission channel 34, along which the refrigerant can flow from the connector 33 to the first sub-heat exchange channel 311a; the second path refers to the refrigerant flow path set in the transmission channel 34, along which the refrigerant can flow from the connector 33 to the second sub-heat exchange channel 311b.

[0173] The length of the first path is less than the length of the second path, meaning that the distance the refrigerant travels along the first path is less than the distance the refrigerant travels along the second path. Under the same conditions of pressure, flow rate and other parameters, the time required for the refrigerant to enter the first sub-heat exchange channel 311a from the connector 33 along the first path is less than the time required for the refrigerant to enter the second sub-heat exchange channel 311b from the connector 33 along the second path.

[0174] During the operation of the refrigerant heat exchange component 30, the refrigerant enters the refrigerant heat exchange component 30 through the connector 33. At this time, a part of the refrigerant enters the first sub-heat exchange channel 311a along the first path through the transmission channel 34, and the other part of the refrigerant enters the second sub-heat exchange channel 311b along the second path through the transmission channel 34. The first sub-heat exchange channel 311a contains refrigerant before the second sub-heat exchange channel 311b, and the first sub-heat exchange channel 311a exchanges heat with the corresponding battery cell 21 before the second sub-heat exchange channel 311b.

[0175] Because the temperature of the part of the battery cell assembly 20 corresponding to the first sub-heat exchange channel 311a changes rapidly, this setting enables the first sub-heat exchange channel 311a to better exchange heat with the corresponding battery cell 21, and can further improve the heat exchange efficiency of the first sub-heat exchange channel 311a.

[0176] In this embodiment, the refrigerant enters the first sub-heat exchange channel 311a and the second sub-heat exchange channel 311b via a first path and a second path, respectively, with the length of the first path being less than the length of the second path. In this configuration, the refrigerant can first enter the first sub-heat exchange channel 311a and exchange heat with the corresponding portion of the battery cell assembly 20. This allows the refrigerant heat exchange component 30 to exchange heat with the portion of the battery cell assembly 20 where the temperature changes rapidly, and enables the refrigerant heat exchange component 30 to provide heat exchange with varying efficiencies at different locations within the battery cell assembly 20, thereby improving the temperature uniformity of the battery cell assembly 20.

[0177] Referring to Figures 4 to 6, in some embodiments, in the first direction, the connector 33 is located in the middle of the refrigerant heat exchange component 30.

[0178] With the first sub-heat exchange channel 311a located in the middle of the refrigerant heat exchange component 30 along the first direction, the connector 33 is also located in the middle of the refrigerant heat exchange component 30 along the first direction, so as to further shorten the length of the first path, thereby further shortening the time required for the refrigerant to enter the first sub-heat exchange channel 311a from the connector 33, and further improving the heat exchange efficiency of the first sub-heat exchange channel 311a.

[0179] In this embodiment, the connector 33 is located in the middle of the refrigerant heat exchange component 30 to further shorten the length of the refrigerant entering the first sub-heat exchange channel 311a from the connector 33, and to enable the refrigerant to enter the first sub-heat exchange channel 311a more quickly and to exchange heat with the middle of the battery cell assembly 20 more quickly.

[0180] Referring to Figures 6, 8, and 9, in some embodiments, the branch channel 3111 includes an inlet channel 31111 and a return channel 31112, both of which are connected to the transmission channel 34.

[0181] The inlet channel 31111 refers to a portion of the channel structure within the branch channel 3111, where the refrigerant can flow. The inlet channel 31111 can be a continuous channel structure or a structure formed by multiple channel structures connected in parallel. The return channel 31112 also refers to a portion of the channel structure within the branch channel 3111, where the refrigerant can also flow. The return channel 31112 can be a continuous channel structure or a structure formed by multiple channel structures connected in parallel. The inlet channel 31111 can be directly connected to the return channel 31112, or it can be indirectly connected to the return channel 31112 through other channel structures.

[0182] Both the inlet channel 31111 and the return channel 31112 are connected to the transmission channel 34. That is, the refrigerant can enter the inlet channel 31111 from the transmission channel 34 so that the refrigerant can enter the corresponding branch channel 3111. The refrigerant can also enter the transmission channel 34 from the return channel 31112 so that the refrigerant can be discharged from the corresponding branch channel 3111.

[0183] During the flow of the refrigerant in the inlet channel 31111 and the return channel 31112, the refrigerant can exchange heat with the adjacent battery cells 21.

[0184] In this embodiment, the inlet channel 31111 and the return channel 31112 of the branch channel 3111 are both connected to the transmission channel 34, so that the transmission channel 34 can both allow refrigerant to enter each branch channel 3111 and allow refrigerant to flow out from each branch channel 3111.

[0185] Referring to Figures 6 and 10, in some embodiments, the transmission channel 34 includes an inlet channel 341 and an outlet channel 342. The inlet channel 341 is connected to each inlet channel 31111, and the outlet channel 342 is connected to each loop channel 31112. Both the inlet channel 341 and the outlet channel 342 are connected to the connector 33. The first path and the second path are both formed in the inlet channel 341.

[0186] The inlet channel 341 refers to a portion of the channel structure in the transmission channel 34, in which the refrigerant can flow. One end of the inlet channel 341 is connected to the connector 33, and the other end of the inlet channel 341 is connected to the inlet channel 31111, so that the refrigerant can enter the connected inlet channel 31111 from the connector 33 through the inlet channel 341.

[0187] Both the first path and the second path are formed in the inlet flow channel 341. That is, the inlet flow channel 341 can correspond to the branch channel 3111 of the first sub-heat exchange flow channel 311a, or it can correspond to the branch channel 3111 of the second sub-heat exchange flow channel 311b. Since the sub-heat exchange flow channel 311 includes at least two branch channels 3111, the number of inlet flow channels 341 can be one. In this case, the inlet flow channel 341 can have multiple ends to be connected to each branch channel 3111 respectively. The number of inlet flow channels 341 can also be multiple. In this case, one inlet flow channel 341 can correspond to one sub-heat exchange flow channel 311 or one branch channel 3111.

[0188] The outlet flow channel 342 refers to a portion of the channel structure in the transmission flow channel 34, in which the refrigerant can flow. One end of the outlet flow channel 342 is connected to the connector 33, and the other end of the outlet flow channel 342 is connected to the return flow channel 31112, so that the refrigerant can enter the connector 33 from the return flow channel 31112 through the outlet flow channel 342.

[0189] The factor heat exchange channel 311 includes at least two sub-channels 3111, so the number of outlet channels 342 can be one. In this case, the outlet channel 342 can have multiple ends to be connected to each sub-channel 3111 respectively. The number of outlet channels 342 can also be multiple. In this case, one outlet channel 342 can correspond to one sub-heat exchange channel 311 or one sub-channel 3111.

[0190] This embodiment provides specific structures for some transmission channels 34, enabling refrigerant to enter each branch channel 3111 through the inlet channel 341, and enabling the refrigerant in the branch channel 3111 to be discharged from the outlet channel 342 to the outside of the refrigerant heat exchange component 30.

[0191] Referring to Figures 6 and 10, in some embodiments, at least a portion of the inlet channel 341 is disposed adjacent to the outlet channel 342.

[0192] At least a portion of the inlet flow channel 341 is arranged adjacent to the outlet flow channel 342. That is, the inlet flow channel 341 can be completely adjacent to the outlet flow channel 342, or only a portion of the inlet flow channel 341 can be arranged adjacent to the outlet flow channel 342. The portion of the inlet flow channel 341 adjacent to the outlet flow channel 342 can exchange heat with the outlet flow channel 342 to reduce the temperature difference between the inlet flow channel 341 and the outlet flow channel 342.

[0193] Since the refrigerant exchanges heat with the battery cell assembly 20 in each sub-heat exchange channel 311 before entering the outlet channel 342, its temperature retention capacity will decrease and its temperature will gradually change when the refrigerant undergoes a complete phase change. For example, when the refrigerant is used to dissipate heat from the battery cell assembly 20, the temperature of the refrigerant in the outlet channel 342 may be higher. Accordingly, at least a portion of the inlet channel 341 is arranged adjacent to the outlet channel 342 to allow heat exchange between the inlet and outlet channels 342. By controlling the temperature of the outlet channel 342 through the inlet channel 341, the temperature difference between the inlet and outlet channels 341 can be reduced, thereby improving the temperature uniformity performance of the refrigerant heat exchange component 30.

[0194] In this embodiment, at least a portion of the inlet channel 341 is arranged adjacent to the outlet channel 342 so that adjacent portions of the inlet channel 341 and the outlet channel 342 can exchange heat, thereby improving the temperature uniformity of the refrigerant heat exchange component 30.

[0195] Referring to Figures 6, 8, and 9, in some embodiments, the inlet channel 31111 and the return channel 31112 are arranged adjacent to each other.

[0196] The inlet flow channel 31111 and the return flow channel 31112 are arranged adjacent to each other so that the inlet flow channel 31111 can exchange heat with the adjacent return flow channel 31112. It can be understood that the inlet flow channel 31111 and the return flow channel 31112 in the same branch channel 3111 can be arranged adjacent to each other, or the inlet flow channel 31111 and the return flow channel 31112 of two adjacent different branch channels 3111 can be arranged adjacent to each other.

[0197] During the process of the refrigerant entering the branch channel 3111 through the transmission channel 34, the refrigerant first enters the inlet channel 31111 and exchanges heat with the adjacent battery cell 21. Then the refrigerant enters the loop channel 31112 from the inlet channel 31111. During the process of the refrigerant entering the inlet channel 31111 and entering the loop channel 31112 from the inlet channel 31111, the refrigerant is always exchanging heat with the adjacent battery cell 21. That is, the temperature of the refrigerant in the loop channel 31112 may be higher than the temperature of the refrigerant in the inlet channel 31111, which may easily affect the heat exchange performance of the refrigerant in the loop channel 31112.

[0198] Accordingly, the inlet flow channel 31111 and the return flow channel 31112 are arranged adjacent to each other to reduce the temperature difference between the refrigerant in the inlet flow channel 31111 and the refrigerant in the return flow channel, thereby improving the temperature uniformity of the refrigerant heat exchange component 30 and improving the temperature uniformity of the battery cell assembly 20.

[0199] In this embodiment, the inlet channel 31111 and the return channel 31112 are arranged adjacent to each other so that the inlet channel 31111 and the adjacent return channel 31112 can exchange heat, thereby further improving the temperature uniformity of the refrigerant heat exchange component 30.

[0200] Referring to Figures 6, 8, and 9, in some embodiments, the return flow channel 31112 and the inlet flow channel 31111 are arranged adjacent to each other in the same sub-heat exchange channel 311.

[0201] In the same sub-heat exchange channel 311, the loop channel 31112 and the inlet channel 31111 are arranged adjacent to each other. Since a sub-heat exchange channel 311 includes at least two branch channels 3111, that is, the inlet channel 31111 in any branch channel 3111 of the same sub-heat exchange channel 3111 is adjacent to the loop channel 31112 in the other adjacent branch channel 3111.

[0202] Under this setting, the temperature difference of the refrigerant in the loop channel 31112 and the inlet channel 31111 of each branch channel 3111 in the same sub-heat exchange channel 311 is small, thereby improving the temperature uniformity performance of the refrigerant heat exchange component 30.

[0203] This embodiment provides a specific structure in which the inlet channel 31111 and the loop channel 31112 are arranged adjacently, so that the inlet channel 31111 and the loop channel 31112 in the same sub-heat exchange channel 311 can exchange heat, thereby improving the temperature uniformity of a single sub-heat exchange channel 311.

[0204] In some embodiments, the inlet channel 31111 in one sub-heat exchange channel 311 is arranged adjacent to the loop channel 31112 in another adjacent sub-heat exchange channel 311.

[0205] In two adjacent sub-heat exchange channels 311, the inlet channel 31111 of one sub-heat exchange channel 311 is connected to the loop channel 31112 in the other adjacent sub-heat exchange channel 311. Under this configuration, the temperature difference of the refrigerant in the loop channel 31112 and the inlet channel 31111 of each branch channel 3111 in the two adjacent sub-heat exchange channels 311 is small, thereby improving the temperature uniformity of the refrigerant heat exchange component 30. This configuration also enables the heat exchange efficiency and temperature difference of each sub-heat exchange channel 311 to gradually change along the first direction, thereby adapting to the arrangement of temperature changes at different locations of the battery cell assembly 20.

[0206] This embodiment provides a specific structure in which the inlet flow channel 31111 and the return flow channel 31112 are arranged adjacent to each other. This arrangement can reduce the temperature difference between adjacent parts of two adjacent sub-heat exchange channels 311, thereby further improving the temperature uniformity of the refrigerant heat exchange component 30.

[0207] Referring to Figures 6 and 10, in some embodiments, the outlet flow channel 342 includes a main outlet flow channel 3421 and a sub-outlet flow channel 3422 connected to the main outlet flow channel 3421. The main outlet flow channel 3421 is connected to the connector 33. The number of sub-outlet flow channels 3422 is at least two, and each sub-outlet flow channel 3422 is connected to each loop flow channel 31112. Each sub-outlet flow channel 3422 is located at the edge of the refrigerant heat exchange component 30.

[0208] The main outlet flow channel 3421 refers to a part of the structure in the outlet flow channel 342. The main outlet flow channel 3421 is connected to the connector 33, and the refrigerant can enter the connector 33 through the main outlet flow channel 3421 and be discharged outside the refrigerant heat exchange component 30. The number of main outlet flow channels 3421 can be one, two or more.

[0209] The sub-outlet flow channel 3422 refers to a part of the structure in the outlet flow channel 342. One end of the sub-outlet flow channel 3422 is connected to the loop flow channel 31112, and the other end is connected to the main outlet flow channel 3421. The refrigerant in the branch flow channel 3111 can enter the sub-outlet flow channel 3422 through the loop flow channel 31112, and then enter the main outlet flow channel 3421 through the sub-outlet flow channel 3422 and finally be discharged outside the refrigerant heat exchange component 30 through the connector 33.

[0210] The number of sub-outlet channels 3422 is at least two, that is, the number of sub-outlet channels 3422 can be two, or three or more; a sub-outlet channel 3422 can be connected to only one loop channel 31112, or it can have multiple ends and be connected to multiple different loop channels 31112.

[0211] The sub-outlet channel 3422 is located at the edge of the refrigerant heat exchange component 30. Since the sub-outlet channel 3422 is part of the outlet channel 342, and the temperature of the refrigerant in the outlet channel 342 usually changes rapidly, and since the edge of the refrigerant heat exchange component 30 is close to the edge of the battery cell assembly 20, the temperature of the edge of the battery cell assembly 20 changes slowly, the sub-outlet channel 3422 is located at the edge of the refrigerant heat exchange component 30 to reduce the risk of the battery cell assembly 20 experiencing a faster temperature change due to the sub-outlet channel 3422.

[0212] For example, if at least a portion of the inlet flow channel 341 is adjacent to the outlet flow channel 342, the inlet flow channel 341 can be adjacent to the main outlet flow channel 3421 to reduce the risk of accelerated temperature change in the battery cell assembly 20 due to the main outlet flow channel 3421.

[0213] In this embodiment, each sub-outlet channel 3422 is connected to each sub-return channel, and each sub-outlet channel 3422 is located at the edge of the refrigerant heat exchange component 30, so as to separate the parts of the refrigerant heat exchange component 30 with the parts of the battery cell assembly 20 with rapid temperature changes, thereby reducing the negative impact of the refrigerant heat exchange component 30 on the temperature uniformity of the battery cell assembly 20.

[0214] Referring to Figures 6, 7, and 10, in some embodiments, the heat exchange surface 32 includes an edge region 323, which corresponds to at least a portion of each sub-outlet channel 3422, and the edge region 323 is offset from the battery cell assembly 20.

[0215] The edge region 323 refers to a portion of the heat exchange surface 32. The edge region 323 corresponds to at least a portion of each sub-outlet channel 3422, meaning that at least a portion of the sub-outlet channel 3422 can exchange heat with the external structure at the edge region 323. Since at least a portion of the sub-outlet channel 3422 is located at the edge of the refrigerant heat exchange component 30, the edge region 323 is also located at the edge of the heat exchange surface 32.

[0216] The edge region 323 can be a region set on the heat exchange surface 32, or it can be a region enclosed on the heat exchange surface 32 by a structure; the shape of the edge region 323 can be square, circular or other shapes; for example, the edge region 323 can be a strip-shaped structure.

[0217] The edge area 323 is staggered from the battery cell assembly 20, meaning that the battery cell assembly 20 cannot cover the edge area 323. Accordingly, the edge area 323 can be directly exposed in the space inside the housing 10. The refrigerant heat exchange component 30 can also be connected to the housing 10 at the edge area 323. The refrigerant heat exchange component 30 can also be connected to other structures with lower temperature requirements at the edge area 323.

[0218] Because the temperature of the refrigerant in the sub-outlet channel 3422 usually changes rapidly, the edge region 323 is staggered from the battery cell assembly 20 to reduce the risk of direct heat exchange between the refrigerant in the sub-outlet channel 3422 and the battery cell assembly 20, thereby reducing the negative impact of the refrigerant heat exchange component 30 on the temperature uniformity of the battery cell assembly 20.

[0219] The edge region 323 corresponds to at least a portion of the sub-outlet channel 3422, that is, the edge region 323 may correspond to the entire sub-outlet channel 3422 or only a portion of the sub-outlet channel 3422. For example, the sub-outlet channel 3422 is connected to the loop channel 31112, and the loop channel 31112 corresponds to the battery cell assembly 20. The refrigerant in the loop channel 31112 can exchange heat with the battery cell assembly 20. Therefore, a part of the sub-outlet channel 3422 can extend beyond the edge region 323. In this case, the edge region 323 corresponds only to a part of the sub-outlet channel 3422. For example, the sub-outlet channel 3422 is connected to the loop channel 31112, and the loop channel 31112 corresponds to the battery cell assembly 20. The refrigerant in the loop channel 31112 can exchange heat with the battery cell assembly 20. Therefore, a part of the loop channel 31112 can also extend into the edge region 323. In this case, the edge region 323 corresponds to the entire sub-outlet channel 3422.

[0220] Understandably, depending on the extension method of each loop flow channel 31112, each sub-outlet flow channel 3422 may be located only along the first direction at the edge of the refrigerant heat exchange component 30, or along other directions at the edge of the refrigerant heat exchange component 30, or in a ring shape around the periphery of the refrigerant heat exchange component 30; correspondingly, the edge region 323 may be located only along the first direction at the edge of the heat exchange surface 32, or along other directions at the edge of the heat exchange surface 32, or in a ring shape around the periphery of the heat exchange surface 32.

[0221] In this embodiment, the sub-outlet flow channel 3422 is staggered from the battery cell assembly 20, which makes it difficult for the sub-outlet flow channel to exchange heat with the battery cell assembly 20, thereby further reducing the negative impact of the refrigerant heat exchange component 30 on the temperature uniformity of the battery cell assembly 20.

[0222] Referring to Figures 6, 7, and 10, in some embodiments, each sub-outlet channel 3422 includes a first channel segment 34221 and a second channel segment 34222 connected to the first channel segment 34221. The first channel segment 34221 is connected to the main outlet channel 3421, and the second channel segment 34222 is connected to the corresponding loop channel 31112. Each first channel segment 34221 is arranged adjacent to each other, and the edge region 323 corresponds to at least each first channel segment 34221.

[0223] The first flow channel section 34221 refers to part of the structure of the sub-outlet flow channel 3422. The first flow channel section 34221 is connected to the main outlet flow channel 3421, and the refrigerant in the sub-outlet flow channel 3422 can enter the main outlet flow channel 3421 from the first flow channel section 34221.

[0224] The second flow channel section 34222 refers to a part of the sub-outlet flow channel 3422. The second flow channel section 34222 is connected to the loop flow channel 31112. The refrigerant in the loop flow channel 31112 can enter the sub-outlet flow channel 3422 from the second flow channel section 34222. The sub-outlet flow channel 3422 may include one second flow channel section 34222, or it may include two or more second flow channel sections 34222.

[0225] Each first flow channel section 34221 is arranged adjacently to reduce the space occupied by the first flow channel section 34221. The first flow channel section 34221 is located at the end of the flow path of the refrigerant in the refrigerant heat exchange component 30. The temperature of the refrigerant in the first flow channel section 34221 changes rapidly, so each first flow channel section 34221 is arranged adjacently to reduce the space occupied by the first flow channel section 34221.

[0226] The edge region 323 corresponds at least to each of the first flow channel sections 34221. The edge region 323 may correspond only to each of the first flow channel sections 34221, or it may correspond to a part of the second flow channel section 34222, or it may correspond completely to the second flow channel section 34222. Because the temperature of the refrigerant changes rapidly in the first flow channel section 34221, the edge region 323 is made to correspond to the first flow channel section 34221 so that the refrigerant in the first flow channel section 34221 is difficult to directly exchange heat with the battery cell assembly 20. This reduces the risk that the temperature of the battery cell assembly 20 will change rapidly due to the main outlet flow channel 3421, thereby further reducing the negative impact of the refrigerant heat exchange component 30 on the temperature uniformity of the battery cell assembly 20.

[0227] This embodiment provides specific structures for some sub-outlet channels 3422 so that each channel can be connected to each sub-outlet channel 3422; at the same time, each first channel segment 34221 is located at the edge of the refrigerant heat exchange component 30 to reduce the negative impact of the first channel segment 34221 on the temperature uniformity of the battery cell assembly 20.

[0228] In some embodiments, the battery device 100 includes a housing 10, a battery cell assembly 20, and a refrigerant heat exchange component 30.

[0229] Both the battery cell assembly 20 and the refrigerant are housed in the housing 10. The battery cell assembly 20 includes battery cells 21 arranged in an array along the length direction Y and the width direction X of the battery device 100.

[0230] The refrigerant heat exchange component 30 includes a base component, which is connected to the battery cell 21; a heat exchange channel 31 is formed inside the base component, and the heat exchange channel 31 includes multiple sub-heat exchange channels 311.

[0231] The sub-heat exchange channel 311 includes a first sub-heat exchange channel 311a and four second sub-heat exchange channels 311b. The first sub-heat exchange channel 311a is located in the middle of the base component along the width direction X of the battery device 100, and the four second sub-heat exchange channels 311b are symmetrically arranged on both sides of the first sub-heat exchange channel 311a along the width direction X of the battery device 100.

[0232] The base component has a heat exchange surface 32 on the side facing the battery cell assembly 20. A first region 321 and a second region 322 are arranged on the heat exchange surface 32 along the width direction X of the battery cell 21. The first region 321 corresponds to the first sub-heat exchange channel 311a, and the second region 322 corresponds to the second sub-heat exchange channel 311b. The arrangement density of the branch channels 3111 in the first sub-heat exchange channel 311a in the first region 321 is greater than the arrangement density of the branch channels 3111 in the second sub-heat exchange channel 311b in the second region 322. The middle part of the battery cell assembly 20 along the width direction X of the battery device 100 corresponds to the first region 321.

[0233] Each sub-heat exchange channel 311 includes at least one inlet channel 31111 and at least one return channel 31112. The refrigerant enters the sub-heat exchange channel 311 from the inlet channel 31111 and is discharged outside the sub-heat exchange channel 311 through the return channel 31112. For the entire heat exchange channel 31, in the width direction X of the battery device 100, each inlet channel 31111 and each return channel 31112 are arranged alternately in sequence.

[0234] The refrigerant heat exchange component 30 also includes a connector 33 disposed on the base component.

[0235] The refrigerant heat exchange component 30 also includes a transmission channel 34 disposed within the base component. The transmission channel 34 includes an inlet channel 341 and an outlet channel 342. One end of the inlet channel 341 is connected to the connector 33, and the other end of the inlet channel 341 is connected to each sub-heat exchange channel 311. A portion of the refrigerant flows from the connector 33 into the first sub-heat exchange channel 311a along a first path in the inlet channel 341, and another portion of the refrigerant flows from the connector 33 into the second sub-heat exchange channel 311b along a second path in the inlet channel 341. The length of the first path is less than the length of the second path.

[0236] The outlet flow channel 342 includes a main outlet flow channel 3421 and a sub-outlet flow channel 3422. One end of the main outlet flow channel 3421 is connected to the connector 33, and the other end of the main outlet flow channel 3421 is connected to the sub-outlet flow channel 3422. The sub-outlet flow channel 3422 includes a first flow channel section 34221 and a second flow channel section 34222. One end of the first flow channel section 34221 is connected to the main outlet flow channel 3421, and the other end of the first flow channel section 34221 is connected to the second flow channel section 34222. One end of the second flow channel section 34222 is connected to the first flow channel section 34221, and the other end of the second flow channel section 34222 is connected to the loop flow channel 31112.

[0237] Each first flow channel segment 34221 is arranged adjacently and along the width direction X of the battery device 100 at the two edges of the refrigerant heat exchange component 30. The heat exchange surface 32 is provided with edge regions 323 along both edges of the width direction X of the battery device 100. The edge regions 323 correspond to the first flow channel segments 34221. The battery cell assembly 20 is staggered from the edge regions 323.

[0238] Secondly, this application embodiment also provides a refrigerant heat exchange component 30. The refrigerant heat exchange component 30 has a heat exchange channel 31 inside, which is used for the flow of refrigerant heat exchange medium. The heat exchange channel 31 includes at least two sub-heat exchange channels 311 arranged sequentially along a first direction. Each sub-heat exchange channel 311 includes at least two interconnected branch channels 3111, and the branch channels 3111 are spaced apart. Each sub-heat exchange channel 311 includes a first sub-heat exchange channel 311a and at least one second sub-heat exchange channel 311b. Each second sub-heat exchange channel 311b is located at one of the first sub-heat exchange channels 311a. The refrigerant heat exchange component 30 also includes a heat exchange surface 32 corresponding to the heat exchange channel 31, with a first direction parallel to the heat exchange surface 32. The heat exchange surface 32 is disposed close to or in contact with the battery cell assembly 20. The heat exchange surface 32 has a first region 321 and a second region 322. The first region 321 corresponds to the first sub-heat exchange channel 311a, and the second region 322 corresponds to the second sub-heat exchange channel 311b. The arrangement density of each branch channel 3111 in the first sub-heat exchange channel 311a in the first region 321 is greater than the arrangement density of each branch channel 3111 in the second sub-heat exchange channel 311b in the second region 322.

[0239] Similar to the refrigerant heat exchange component 30 in some embodiments of the first aspect, this embodiment makes the heat exchange channel 31 include a first sub-heat exchange channel 311a and at least one second sub-heat exchange channel 311b, and makes the arrangement density of the branch channels 3111 in the first sub-heat exchange channel 311a in the first region 321 greater than the arrangement density of the branch channels 3111 in the second sub-heat exchange channel 311b in the second region 322. This improves the heat exchange capability of the refrigerant heat exchange component 30 in the portion of the battery cell assembly 20 corresponding to the first region 321, so as to better exchange heat with the part of the battery cell assembly 20 where the temperature changes rapidly, thereby making the temperature of different parts of the battery cell assembly 20 more uniform and improving the temperature uniformity of the battery cell assembly 20.

[0240] Thirdly, embodiments of this application also provide an energy storage device, including a battery device 100 provided in some embodiments of the first aspect, or a refrigerant heat exchange component 30 provided in some embodiments of the second aspect.

[0241] The energy storage device may include multiple battery devices 100, which can be connected in series via a busbar to increase the voltage of the energy storage device. The multiple battery devices 100 may also be connected in parallel to increase the capacity of the energy storage device.

[0242] Energy storage devices can be used in vehicles, energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems.

[0243] In this energy storage device, the temperature distribution of the battery device 100 during operation is relatively uniform, and it is not easy for some parts to become too hot. The uniform temperature distribution in the battery device 100 allows the individual battery cells 21 in the battery device 100 to input or output relatively stably and efficiently at a suitable operating temperature. At the same time, it can also reduce the occurrence of local overheating in the battery device 100, improve the service life of the battery device 100, and reduce the risk of using the battery device 100.

[0244] Fourthly, embodiments of this application also provide an electrical device, including a battery device 100 provided in some embodiments of the first aspect, a refrigerant heat exchange component 30 provided in some embodiments of the second aspect, or an energy storage device provided in some embodiments of the third aspect.

[0245] In this electrical device, the temperature distribution of the battery device 100 during operation is relatively uniform, and it is not easy for some parts to become too hot. The uniform temperature distribution in the battery device 100 allows the individual battery cells 21 in the battery device 100 to input or output relatively stably and efficiently at a suitable operating temperature. At the same time, it can also reduce the occurrence of local overheating of the battery device 100, improve the service life of the battery device 100, and reduce the risk of using the battery device 100.

[0246] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, wherein, include: Battery cell assembly; A refrigerant heat exchange component has a heat exchange channel inside, the heat exchange channel is used for the flow of refrigerant heat exchange medium, the heat exchange channel includes at least two sub-heat exchange channels arranged sequentially along a first direction, each of the sub-heat exchange channels includes at least two interconnected branch channels, and the branch channels are spaced apart. Each of the sub-heat exchange channels includes a first sub-heat exchange channel and at least one second sub-heat exchange channel, and each second sub-heat exchange channel is located on one side or opposite sides of the first sub-heat exchange channel; The refrigerant heat exchange component also includes a heat exchange surface corresponding to the heat exchange channel, the first direction is parallel to the heat exchange surface, and the heat exchange surface is disposed close to or in contact with the battery cell assembly. The heat exchange surface has a first region and a second region. The first region corresponds to the first sub-heat exchange channel, and the second region corresponds to the second sub-heat exchange channel. The arrangement density of each branch channel in the first sub-heat exchange channel in the first region is greater than the arrangement density of each branch channel in the second sub-heat exchange channel in the second region.

2. The battery device according to claim 1, wherein, The ratio of the arrangement density of each branch channel in the first sub-heat exchange channel in the first region to the arrangement density of each branch channel in the second sub-heat exchange channel in the second region ranges from 1.5 to 4.

3. The battery device according to claim 1 or 2, wherein, The branch channels in the first sub-heat exchange channel are arranged at a first spacing, and the branch channels in the second sub-heat exchange channel are arranged at a second spacing, wherein the first spacing is smaller than the second spacing.

4. The battery device according to claim 3, wherein, The first spacing ranges from 2mm to 7mm.

5. The battery device according to claim 3 or 4, wherein, The second spacing ranges from 20mm to 30mm.

6. The battery device according to any one of claims 1-5, wherein, The width of the diversion channel ranges from 5mm to 12mm.

7. The battery device according to any one of claims 1-6, wherein, The sub-heat exchange channel further includes a third sub-heat exchange channel, which is disposed along the first direction on the side of the second sub-heat exchange channel away from the first sub-heat exchange channel. The heat exchange surface also has a third region, which corresponds to the third sub-heat exchange channel. The arrangement density of each of the branch channels in the second sub-heat exchange channel in the second region is greater than the arrangement density of each of the branch channels in the third sub-heat exchange channel in the third region.

8. The battery device according to any one of claims 1-7, wherein, In the first direction, the first sub-heat exchange channel is located in the middle of the refrigerant heat exchange component, and each of the second sub-heat exchange channels is arranged on both sides of the first sub-heat exchange channel along the first direction.

9. The battery device according to claim 8, wherein, In the first direction, each of the second sub-heat exchange channels is symmetrically arranged on both sides of the first sub-heat exchange channel.

10. The battery device according to any one of claims 1-9, wherein, The refrigerant heat exchange component also includes a connector, and the refrigerant heat exchange component also has a transmission channel inside, and each of the sub-heat exchange channels is connected to the connector through the transmission channel. The refrigerant heat exchange medium enters the first sub-heat exchange channel from the joint via the transmission channel along the first path, and the refrigerant heat exchange medium enters the second sub-heat exchange channel from the joint via the transmission channel along the second path, wherein the length of the first path is less than the length of the second path.

11. The battery device according to claim 10, wherein, In the first direction, the joint is located in the middle of the refrigerant heat exchange component.

12. The battery device according to claim 10 or 11, wherein, The flow channel includes an inlet flow channel and a return flow channel, both of which are connected to the transmission flow channel.

13. The battery device according to claim 12, wherein, The transmission channel includes an inlet channel and an outlet channel. The inlet channel is connected to each of the inlet channels, and the outlet channel is connected to each of the loop channels. Both the inlet channel and the outlet channel are connected to the connector, and both the first path and the second path are formed within the inlet channel.

14. The battery device according to claim 13, wherein, At least a portion of the inlet channel is disposed adjacent to the outlet channel.

15. The battery device according to any one of claims 12-14, wherein, The inlet channel and the return channel are arranged adjacent to each other.

16. The battery device according to claim 15, wherein, In the same sub-heat exchange channel, the return channel and the inlet channel are arranged adjacent to each other.

17. The battery device according to claim 15 or 16, wherein, The inlet channel in one of the sub-heat exchange channels is arranged adjacent to the loop channel in the adjacent sub-heat exchange channel.

18. The battery device according to claim 13 or 14, wherein, The outlet flow channel includes a main outlet flow channel and a sub-outlet flow channel connected to the main outlet flow channel. The main outlet flow channel is connected to the connector. The number of sub-outlet flow channels is at least two, and each sub-outlet flow channel is connected to each of the loop flow channels. Each of the sub-outlet channels is located at the edge of the refrigerant heat exchange component.

19. The battery device according to claim 18, wherein, The heat exchange surface includes an edge region corresponding to at least a portion of each of the sub-outlet channels, and the edge region is offset from the battery cell assembly.

20. The battery device according to claim 19, wherein, Each of the sub-outlet channels includes a first channel segment and a second channel segment connected to the first channel segment. The first channel segment is connected to the main outlet channel, and the second channel segment is connected to the corresponding loop channel. Each of the first flow channel segments is arranged adjacent to each other, and the edge region corresponds at least to each of the first flow channel segments.

21. A refrigerant heat exchange component, wherein, The refrigerant heat exchange component has a heat exchange channel inside, which is used for the refrigerant heat exchange medium to flow through. The heat exchange channel includes at least two sub-heat exchange channels arranged sequentially along a first direction. Each sub-heat exchange channel includes at least two interconnected branch channels, and each branch channel is spaced apart. Each of the sub-heat exchange channels includes a first sub-heat exchange channel and at least one second sub-heat exchange channel, and each second sub-heat exchange channel is located on one side or opposite sides of the first sub-heat exchange channel; The refrigerant heat exchange component also includes a heat exchange surface corresponding to the heat exchange channel, and the first direction is parallel to the heat exchange surface; The heat exchange surface has a first region and a second region. The first region corresponds to the first sub-heat exchange channel, and the second region corresponds to the second sub-heat exchange channel. The arrangement density of each branch channel in the first sub-heat exchange channel in the first region is greater than the arrangement density of each branch channel in the second sub-heat exchange channel in the second region.

22. An energy storage device, wherein, It includes the battery device as described in any one of claims 1-20, or the refrigerant heat exchange component as described in claim 21.

23. An electrical appliance, wherein, It includes a battery device as described in any one of claims 1-20, or a refrigerant heat exchange component as described in claim 21, or an energy storage device as described in claim 22.

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