Battery device and electric device

Abstract

A battery device and an electric device. The battery device comprises: a case (100); a battery cell assembly (200) arranged in the case (100), wherein the battery cell assembly (200) comprises a plurality of battery cells (210); and a heat exchange assembly (300) comprising a plurality of heat exchange flow channels (31), wherein the plurality of heat exchange flow channels are connected in parallel, inlets (3103) and outlets (3104) of the plurality of heat exchange flow channels are all arranged at the same end of the battery device in a first direction, the first direction is the length direction of the battery device, at least part of each heat exchange flow channel (31) is formed into a flow channel main body (311), a plurality of flow channel main bodies (311) are sequentially arranged in the first direction, and the numbers of battery cells (210) attached to at least two flow channel main bodies (311) for heat exchange are different.

Description

Battery devices and electrical appliances Technical Field

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

[0002] In existing technologies, to ensure the normal operation and lifespan of battery devices, heat exchange components and individual battery cells are typically installed within the device. The heat exchange components exchange heat with the individual battery cells to regulate their temperature, thereby extending the battery device's lifespan. However, currently, battery devices contain a large number of individual battery cells, and the temperature uniformity among these cells needs further improvement.

[0003] Application content

[0004] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a battery device and an electrical device including the battery device, wherein the battery device can reduce the temperature difference between battery cells at different locations within the battery device and improve the temperature uniformity of the battery device.

[0005] In a first aspect, embodiments of this application provide a battery device, comprising: a housing; a battery cell assembly disposed within the housing, the battery cell assembly including a plurality of battery cells; and a heat exchange assembly for heat exchange with the battery cells, the heat exchange assembly including a plurality of heat exchange channels connected in parallel, the inlets and outlets of the plurality of heat exchange channels being arranged at the same end of the battery device in a first direction, the first direction being the length direction of the battery device, at least a portion of each heat exchange channel being formed as a channel body, the plurality of channel bodies being arranged sequentially along the first direction, and at least two channel bodies having different numbers of battery cells that are in contact with each other for heat exchange.

[0006] In the above technical solution, since the heat exchange channels form a channel body, the channel bodies of multiple heat exchange channels are arranged along the length of the battery device, and the inlets and outlets of multiple heat exchange channels are located at the same end of the battery device in the first direction. In this way, not only can the inlets and outlets of multiple heat exchange channels be centrally located, simplifying the structure and layout of external pipelines, reducing installation and maintenance difficulties, and reducing space occupation, but different channel bodies can also exchange heat with different areas of the battery device in the length direction, reducing the temperature difference between battery cells at different positions in the length direction, improving the temperature uniformity of the battery device in the length direction, improving the temperature uniformity between the battery cells corresponding to each heat exchange channel, improving the temperature uniformity between battery cells at the edge of the housing and battery cells near the middle of the housing, and improving the temperature uniformity performance of the battery device. Meanwhile, by varying the number of battery cells that are attached to the heat exchange in at least two flow channels, the number of battery cells attached to the heat exchange in each flow channel can be set according to the heat exchange requirements of the battery cells in different heat exchange areas, thereby improving the heat exchange efficiency of the battery cells in the corresponding heat exchange areas. The number of battery cells attached to the heat exchange can also be set according to the extension length of the flow channel, thereby meeting the heat exchange requirements of each battery cell and improving the temperature uniformity performance between battery cells.

[0007] In some embodiments, the number of battery cells that the multiple flow channels are attached to for heat exchange is reduced in a direction that is gradually away from the inlet and outlet along a first direction.

[0008] In the above technical solution, as the number of battery cells that are in contact with the heat exchanger decreases in the direction that gradually moves away from the inlet and outlet of the heat exchange channel, the extension length of the multiple channel bodies can be reduced sequentially or in a stepwise manner, making the extension length of the multiple heat exchange channels roughly the same. This results in the pressure drop and flow resistance of the multiple heat exchange channels being roughly the same, thereby improving the heat exchange uniformity of the multiple heat exchange channels and improving the temperature uniformity between the battery cells.

[0009] In some embodiments, the number of battery cells that are attached to the heat exchanger in the plurality of flow channels decreases sequentially in a direction that is gradually away from the inlet and outlet in a first direction.

[0010] In the above technical solution, since the number of battery cells that are in contact with the heat exchanger in the multiple flow channels decreases sequentially in the direction that is gradually away from the inlet and outlet along the first direction, the extension length of the multiple heat exchange channels can be made more consistent, thereby improving the heat exchange uniformity between the multiple heat exchange channels and further improving the temperature uniformity between the battery cells.

[0011] In some embodiments, at least two flow channel bodies have different heat exchange contact areas with the battery cell assembly.

[0012] In the above technical solution, since the heat exchange contact areas between at least two flow channel bodies and the battery cell assembly are different, the heat exchange contact area between each flow channel body and the battery cell assembly can be set according to the heat exchange requirements of the battery cells in different heat exchange regions. This improves the heat exchange efficiency of the battery cells in different heat exchange regions and enhances the temperature uniformity performance between the various heat exchange regions. Furthermore, the heat exchange contact area with the battery cell assembly can be set according to the extension length of each flow channel body, thereby meeting the heat exchange requirements of each battery cell and improving the temperature uniformity performance between the battery cells.

[0013] In some embodiments, the heat exchange contact area between the multiple flow channel bodies and the battery cell assembly is reduced along a first direction and gradually away from the inlet and outlet.

[0014] In the above technical solution, since the heat exchange contact area between the main body of multiple flow channels and the battery cell assembly is reduced in the direction of gradually moving away from the inlet and outlet of the heat exchange flow channel, the length of the main body of multiple flow channels can be reduced, and the extension length of multiple heat exchange flow channels can be made to be roughly the same. This makes the pressure drop and flow resistance of multiple heat exchange flow channels roughly the same, thereby improving the heat exchange uniformity of multiple heat exchange flow channels and improving the temperature uniformity between battery cells.

[0015] In some embodiments, the heat exchange contact area between the multiple flow channel bodies and the battery cell assembly gradually decreases along a first direction and gradually away from the inlet and outlet.

[0016] In the above technical solution, since the heat exchange contact area between the multiple flow channel bodies and the battery cell assembly gradually decreases along the first direction and gradually away from the inlet and outlet, the extension length of the multiple flow channel bodies can be gradually reduced, further making the extension length of the multiple heat exchange channels more consistent, improving the heat exchange uniformity between the multiple heat exchange channels, and further improving the temperature uniformity between the battery cells.

[0017] In some embodiments, at least two flow channel bodies have different outer contour widths in a first direction.

[0018] In the above technical solution, at least two flow channel bodies have different outer contour widths in the first direction. Therefore, according to different heat exchange requirements, the battery device can be divided into multiple heat exchange regions with different widths along the first direction. Flow channel bodies with different outer contour widths in the first direction are matched with the corresponding heat exchange regions, thereby improving the heat exchange efficiency of battery cells in different heat exchange regions and enhancing the temperature uniformity between battery cells.

[0019] In some embodiments, the outer contour width of the plurality of flow channel bodies decreases in the first direction and gradually moves away from the inlet and outlet.

[0020] In the above technical solution, since the outer contour width of multiple flow channels decreases in the direction gradually moving away from the inlet and outlet of the heat exchange channel, the extension length of multiple flow channels can be reduced in the direction gradually moving away from the inlet and outlet, making the extension length of multiple heat exchange channels roughly the same, thereby making the pressure drop and flow resistance of multiple heat exchange channels roughly the same, thereby improving the heat exchange uniformity of multiple heat exchange channels and improving the temperature uniformity between battery cells.

[0021] In some embodiments, the outer contour width of the plurality of flow channel bodies decreases sequentially in the first direction and gradually away from the inlet and outlet.

[0022] In the above technical solution, since the outer contour width of multiple flow channel bodies decreases sequentially in the first direction and gradually moves away from the inlet and outlet, the extension length of multiple flow channel bodies can be gradually reduced, further making the extension length of multiple heat exchange channels more consistent, improving the heat exchange uniformity between multiple heat exchange channels, and further improving the temperature uniformity between battery cells.

[0023] In some embodiments, there are two heat exchange channels, including a first heat exchange channel and a second heat exchange channel. The main body of the first heat exchange channel is located closest to the inlet and outlet. The ratio of the outer contour width of the main body of the second heat exchange channel in the first direction to the total outer contour width of all battery cell assemblies in the first direction is greater than or equal to 1 / 3 and less than 1 / 2.

[0024] In the above technical solution, by making the ratio of the outer contour width of the main body of the second heat exchange channel in the first direction to the total outer contour width of all battery cell components in the first direction greater than or equal to 1 / 3 and less than 1 / 2, the extension length of the first heat exchange channel and the extension length of the second heat exchange channel can be made to be approximately the same, thereby making the flow resistance and pressure drop of the first heat exchange channel and the second heat exchange channel more consistent, improving the consistency of heat exchange efficiency between the first heat exchange channel and the second heat exchange channel, and thus improving the heat exchange uniformity between the first heat exchange channel and the second heat exchange channel.

[0025] In some embodiments, there are two heat exchange channels, namely a first heat exchange channel and a second heat exchange channel. The main body of the first heat exchange channel is located close to the inlet and outlet. Each heat exchange channel extends from the inlet to the outlet. The ratio of the extension length of the second heat exchange channel to the extension length of the first heat exchange channel is greater than or equal to 1 and less than or equal to 1.2.

[0026] In the above technical solution, the ratio of the extension length of the second heat exchange channel to the extension length of the first heat exchange channel is greater than or equal to 1 and less than or equal to 1.2, which can make the flow resistance and pressure drop of the heat exchange medium in the first heat exchange channel and the second heat exchange channel relatively uniform, thereby improving the temperature uniformity between battery cells.

[0027] In some embodiments, the plurality of heat exchange channels include a first heat exchange channel and a second heat exchange channel. The main body of the first heat exchange channel is located closest to the inlet and outlet. The second heat exchange channel further includes a first connecting portion and a second connecting portion. The first connecting portion, the main body of the channel, and the second connecting portion are connected in sequence. The end of the first connecting portion away from the main body of the channel forms an inlet, and the end of the second connecting portion away from the main body of the channel forms an outlet. The first connecting portion and the second connecting portion both extend along a first direction.

[0028] In the above technical solution, the second heat exchange channel includes a first connecting part and a second connecting part. The first connecting part and the second connecting part are respectively connected to the two ends of the channel body of the second heat exchange channel, and the ends of the first connecting part and the second connecting part away from the channel body are respectively formed as the inlet and outlet of the second heat exchange channel. Thus, the first connecting part and the second connecting part can reduce the temperature difference between the battery cells that are close to the edge of the box and are in contact with the first connecting part and the second connecting part for heat exchange and the battery cells that are close to the middle of the box. It can also reduce the probability of local overheating or local underheating in the battery device and improve the temperature uniformity between battery cells.

[0029] In some embodiments, the first connecting portion is closer to the edge of the housing in a second direction than the second connecting portion, and the second direction intersects with the first direction.

[0030] In the above technical solution, since the first connecting part is located closer to the edge of the housing in the second direction than the second connecting part, and one end of the first connecting part is formed as an inlet, the first connecting part can exchange heat with the battery cells closer to the edge of the housing compared to the second connecting part. This allows the heat exchange medium entering the first connecting part from the inlet to compensate for the heat loss of the battery cells closer to the edge of the housing through heat exchange with the environment, thereby improving the temperature uniformity between the battery cells.

[0031] In some embodiments, the first connection portion and the second connection portion are arranged on the same side of the first heat exchange channel in the second direction.

[0032] In the above technical solution, the first connecting part and the second connecting part are arranged on the same side of the first heat exchange channel in the second direction, which makes it easier to bend and form the second heat exchange channel, further simplifying the arrangement of multiple heat exchange channels, creating a compact structure, improving the space utilization rate inside the box, and reducing the probability of local overheating or underheating in the battery device, thereby improving the temperature uniformity between battery cells.

[0033] In some embodiments, the inlets of the multiple heat exchange channels are all connected, and the outlets of the multiple heat exchange channels are all connected.

[0034] In the above technical solution, the inlets and outlets of multiple heat exchange channels are all connected, which can not only achieve uniform distribution of heat exchange medium in multiple heat exchange channels and improve the temperature uniformity of the battery device, but also reduce flow resistance, improve heat exchange efficiency, and reduce the risk of thermal runaway of the battery device.

[0035] In some embodiments, the heat exchange channel includes a horizontal portion and a vertical portion, the vertical portion extending along a first direction and the horizontal portion extending along a second direction, the second direction being the width direction of the battery device; wherein the vertical portion is closer to the edge of the housing than the horizontal portion.

[0036] In the above technical solution, since the longitudinal section is closer to the edge of the housing than the transverse section, the longitudinal section can exchange heat with the outermost battery cells near the edge of the housing, while the transverse section can exchange heat with the battery cells near the center of the housing. When the heat exchange medium flows into the longitudinal and transverse sections sequentially, it can compensate for the temperature difference between the outermost battery cells near the edge and the battery cells near the center of the housing caused by heat exchange with the environment. This makes the heat exchange effect of the outermost battery cells near the edge and the battery cells near the center of the housing more consistent, improving the temperature uniformity of the battery device and thus increasing the service life of the battery device to a certain extent. In addition, the heat exchange channel includes a longitudinal section extending along the first direction and a transverse section extending along the second direction, which simplifies the structure of the heat exchange channel and facilitates its processing and arrangement.

[0037] In some embodiments, a plurality of transverse portions in the flow channel body are spaced apart and connected sequentially in a first direction, and a longitudinal portion in the flow channel body is connected to at least a portion of the transverse portions.

[0038] In the above technical solution, since multiple horizontal sections of the main body of the flow channel are connected in sequence, and the vertical section connects some or all of the horizontal sections, the multiple horizontal sections can increase the arrangement density of the main body of the flow channel in the length direction of the battery device, improve the heat exchange efficiency and heat exchange uniformity with the battery cells, and the vertical section is arranged closer to the edge of the box and connected to the horizontal sections. The vertical section can exchange heat with the outer battery cells near the edge of the box, increase the heat exchange area with the outer battery cells, and improve the temperature uniformity of the battery device.

[0039] In some embodiments, the flow channel body includes: a first heat exchange section and a second heat exchange section, the first heat exchange section being bent and extending to define a U-shaped region, the second heat exchange section being bent and arranged within the U-shaped region, and the second heat exchange section being bent and connected to one end of the first heat exchange section.

[0040] In the above technical solution, since the first heat exchange section of the main body of the flow channel is bent and extended into a U-shape, and the second heat exchange section is bent and arranged inside the first heat exchange section, and the first heat exchange section and the second heat exchange section are bent and connected, the structure of the main body of the flow channel can be compacted, the flow channel length of the main body of the flow channel and the heat exchange area with the battery cell can be increased, the flow time of the heat exchange medium in the main body of the flow channel can be extended, the heat exchange efficiency can be improved, and the temperature uniformity between the battery cells in the area where the main body of the flow channel is located can be improved.

[0041] In some embodiments, the second heat exchange section includes a plurality of horizontal sections that extend along a second direction and are spaced apart in a first direction, the second direction being the width direction of the battery device, and the plurality of horizontal sections of the second heat exchange section are sequentially bent and connected along the first direction.

[0042] In the above technical solution, the second heat exchange section includes multiple horizontal sections. The multiple horizontal sections can increase the heat exchange area of ​​the second heat exchange section, improve the heat exchange efficiency, make the heat of the second heat exchange section evenly distributed, and improve the temperature uniformity between battery cells. In addition, the multiple horizontal sections are bent and connected in sequence, which can simplify the structure of the second heat exchange section and facilitate the processing and forming of the second heat exchange section.

[0043] In some embodiments, the first heat exchange section includes: two horizontal sections and one vertical section, the two horizontal sections extending along a second direction and spaced apart in a first direction, the second direction being the width direction of the battery device, and the vertical section extending along the first direction and connected between the two horizontal sections.

[0044] In the above technical solution, since the first heat exchange part includes two horizontal parts and a vertical part connected between the two horizontal parts, it is convenient to surround the second heat exchange part inside, simplifying the structure of the first heat exchange part, facilitating the processing and forming of the first heat exchange part, and improving production efficiency.

[0045] In some embodiments, the heat exchange assembly includes a plurality of heat exchange tubes, each of which is bent and extends to define a heat exchange channel.

[0046] In the above technical solution, since the heat exchange assembly includes multiple heat exchange tubes, each of which is bent and extended to define a heat exchange channel, it not only reduces the complexity of the heat exchange channel forming process, thereby increasing the production rate of the heat exchange assembly, but also reduces the fluid pressure drop within a single heat exchange tube, improving heat exchange efficiency. Furthermore, it achieves uniform temperature transfer of the heat exchange medium, improving temperature uniformity between battery cells. In addition, the tubular structure is simpler, lower in cost, and easier to process than the plate structure.

[0047] In some embodiments, the battery cell assembly includes multiple rows of battery cells, with multiple battery cells stacked in a row along a second direction, and multiple rows of battery cells arranged in a battery cell assembly along a first direction. A heat exchange assembly is arranged on at least one side of the battery cell assembly in a third direction. The second direction is the width direction of the battery device, and the first direction, the second direction, and the third direction are arranged at angles to each other.

[0048] In the above technical solution, by making the battery cell assembly include multiple rows of battery cells, with multiple battery cells stacked in a row along the second direction, and multiple rows of battery cells arranged in a battery cell assembly along the first direction, the width of the housing (i.e., the size of the housing in the second direction) can be adapted more flexibly, making full use of the space in the width direction of the housing and improving the energy density of the battery device. At the same time, by setting the heat exchange component on the side of the battery cell assembly in the third direction and arranging multiple flow channels along the first direction, the temperature of each battery cell assembly or each row of battery cells can be independently and precisely controlled by controlling the temperature of the heat exchange medium in each flow channel, thereby improving the temperature uniformity between battery cell assemblies. It is also convenient to arrange the flow channels to extend back and forth along the width direction of the housing, so that the flow channels contact and exchange heat with each battery cell in the corresponding heat exchange area, reducing the risk of local overheating or underheating due to the battery cells not contacting the flow channels in the corresponding heat exchange area, thereby improving the temperature uniformity between battery cells.

[0049] In some embodiments, the width of the heat exchange channel is a first width, the dimension of the battery cell in the first direction is a second width, and the ratio of the first width to the second width is greater than or equal to one-third.

[0050] In the above technical solution, since the ratio of the first width of the heat exchange channel to the second width of the battery cell is greater than or equal to one-third, it can not only increase the width of the heat exchange channel, increase the flow cross-sectional area of ​​the heat exchange channel, reduce the pressure drop of the heat exchange channel, and improve the heat exchange efficiency, but also increase the heat exchange area between the heat exchange channel and the battery cell, increase the heating rate of the heat exchange component to the battery cell, and increase the temperature rise rate of the battery cell.

[0051] In some embodiments, the heat exchange assembly includes a plurality of heat exchange tubes, each heat exchange tube defining a heat exchange channel, and the battery cell has a first wall surface that cooperates with the heat exchange tubes for heat exchange. With the first wall surface as the projection surface, the area of ​​the orthographic projection of the heat exchange tubes on the first wall surface is greater than or equal to one-third of the area of ​​the first wall surface.

[0052] In the above technical solution, since the heat exchange contact area between the heat exchange tube and the battery cell is greater than or equal to one-third of the area of ​​the first wall surface, when the heat exchange tube cools or heats the battery cell, the heat exchange contact area between the heat exchange tube and each battery cell can be increased, thereby improving the heat exchange rate of the battery cell. In this way, not only can the battery cell quickly reach the preset temperature range when the battery device starts working, but it can also keep the battery cell within a suitable temperature range during the normal operation of the battery device, reducing the temperature fluctuation of the battery cell during operation, thereby making the operation of the battery cell more stable and enabling the battery device to maintain good performance.

[0053] In some embodiments, the ratio of the length dimension of the box in the first direction to the width dimension of the box in the second direction is greater than 2, and the first direction intersects the second direction.

[0054] In the above technical solution, since the length-to-width ratio of the housing is greater than 2, the main body of the multiple heat exchange channels is arranged along the length of the battery device, which can make the battery device have a narrower width, reduce the space occupied in the width direction, facilitate the assembly of the battery device, reduce the temperature difference between battery cells in the housing, and improve the temperature uniformity between battery cells.

[0055] In some embodiments, the ratio of the width dimension of the housing in the second direction to the height dimension of the housing in the third direction is less than 0.3, and the first direction, the second direction, and the third direction intersect each other.

[0056] In the above technical solution, since the ratio of the height to the width of the housing is less than 0.3, the battery device can have a thinner thickness, which is beneficial for the assembly of the battery device and reduces the space occupied in the height direction.

[0057] In some embodiments, the thickness of the housing in the third direction is greater than or equal to 20 mm and less than or equal to 50 mm, and the third direction intersects with the first direction.

[0058] In the above technical solution, the thickness of the housing in the third direction is greater than or equal to 20mm and less than or equal to 50mm, which allows the battery device to have a thinner thickness, which is beneficial for the assembly of the battery device and optimizes the position arrangement of the battery device.

[0059] Secondly, embodiments of this application provide an electrical device, including a battery device according to the first aspect of this application.

[0060] In the above-described embodiments, by setting the battery device of the first aspect, the heat exchange channels of the battery device are formed with channel bodies. The channel bodies of multiple heat exchange channels are arranged along the length direction of the battery device, and the inlets and outlets of the multiple heat exchange channels are located at the same end of the battery device in the first direction. In this way, not only can the inlets and outlets of multiple heat exchange channels be centrally located, simplifying the structure and layout of external pipelines, reducing installation and maintenance difficulties, and reducing space occupation, but different channel bodies can also exchange heat with different areas of the battery device in the length direction, reducing the temperature difference between battery cells at different positions in the length direction, improving the temperature uniformity of the battery device in the length direction, improving the temperature uniformity between the battery cells corresponding to each heat exchange channel, improving the temperature uniformity between battery cells at the edge of the housing and battery cells near the middle of the housing, and improving the temperature uniformity performance of the battery device. Meanwhile, by varying the number of battery cells that are attached to the heat exchange in at least two flow channels, the number of battery cells attached to each flow channel can be set according to the heat exchange requirements of the battery cells in different heat exchange areas, thereby improving the heat exchange efficiency of the battery cells in the corresponding heat exchange areas. The number of battery cells attached to the heat exchange can also be set according to the extension length of the flow channel, thereby meeting the heat exchange requirements of each battery cell, improving the temperature uniformity between battery cells, and thus improving the overall performance of the electrical device.

[0061] In some embodiments, the electrical device is a vehicle, and the first direction is the forward and backward direction of the vehicle.

[0062] In the above technical solution, the length of the battery device is along the front-rear direction of the vehicle, which makes it convenient to arrange the battery device on the vehicle and facilitates the assembly of the battery device.

[0063] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0064] Figure 1 is a structural schematic diagram of a vehicle according to an embodiment of this application;

[0065] Figure 2 is a schematic diagram of the structure of a battery device according to an embodiment of this application;

[0066] Figure 3 is an exploded view of the battery device according to an embodiment of this application, with only the top cover blown open;

[0067] Figure 4 is an exploded view of a battery device according to an embodiment of this application;

[0068] Figure 5 is a schematic diagram of multiple battery cell assemblies and heat exchange assemblies of a battery device according to an embodiment of this application;

[0069] Figure 6 is a partial enlarged view of the battery cell assembly and heat exchange assembly shown in Figure 5;

[0070] Figure 7 is an exploded view of the battery device according to an embodiment of this application from another angle.

[0071] Figure label:

[0072] 1. Electrical appliances;

[0073] 1000, Battery assembly; 2000, Controller; 3000, Motor;

[0074] 100. Box body;

[0075] 110. Base plate; 111. Rib; 112. Receiving groove; 113. Mounting plate;

[0076] 120. Top cover; 130. Mounting beam; 140. Sealing element;

[0077] 200. Battery cell assembly; 210. Battery cell;

[0078] 300. Heat exchange components;

[0079] 30. Heat exchanger tubes;

[0080] 31. Heat exchange channel; 31a. First heat exchange channel; 31b. Second heat exchange channel;

[0081] 3101. Horizontal section; 3102. Vertical section; 3103. Inlet; 3104. Outlet;

[0082] 311. Flow channel body; 3111. First heat exchange section; 3112. Second heat exchange section;

[0083] 312. First connecting part; 313. Second connecting part;

[0084] 321. First sleeve; 322. Second sleeve; 331. Inlet pipe; 332. Outlet pipe;

[0085] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two).

[0092] 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," "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.

[0093] 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.

[0094] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include one or more battery cells, and when there are multiple battery cells, they are connected in series, parallel, or mixed connections via a busbar.

[0095] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0096] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0097] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0098] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0099] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0100] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0101] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0102] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0103] The battery cells mentioned in the embodiments of this application may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application are not limited to these. Battery cells may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited to these shapes either. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and the embodiments of this application are not limited to these types either.

[0104] For example, a single battery cell typically includes a housing, a cell assembly, and an electrolyte. The housing is used to house the cell assembly and the electrolyte, and the housing has at least one positive electrode post and at least one negative electrode post. The cell assembly includes one or more electrode assemblies, which are formed by stacking or winding positive electrode sheets, negative electrode sheets, and separators.

[0105] The technical solutions described in the embodiments of this application are applicable to various power devices that use battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0106] In related technologies, to ensure that the battery device operates within a suitable temperature range, heat exchange components are typically installed to exchange heat with the individual battery cells, thereby regulating the temperature of the individual cells. However, in these technologies, the battery devices contain a large number of individual cells, and the temperature differences between these cells are significant, affecting the overall performance of the battery device. Therefore, improving the temperature uniformity among the individual battery cells within the battery device is a technical problem that needs to be solved.

[0107] Based on the above considerations, in order to improve the temperature uniformity among multiple battery cells within the battery device, this application designs a battery device in which a heat exchange component is disposed within a housing for heat exchange with the battery cell assembly. The heat exchange component includes multiple heat exchange channels arranged in parallel, with the inlet and outlet of each heat exchange channel located at the same end of the battery device in a first direction. Each heat exchange channel has a channel body, and the multiple channel bodies are arranged along the length of the housing. At least two channel bodies have different numbers of battery cells that are in contact with each other for heat exchange. Thus, the centralized placement of the inlet and outlet of multiple heat exchange channels simplifies the structure and layout of external piping, reduces installation and maintenance difficulty, and minimizes space occupation. Different channel bodies can also exchange heat with different areas of the battery device along its length, improving the temperature uniformity at different locations within the battery device. Furthermore, by ensuring that at least two channel bodies have different numbers of battery cells in contact with each other for heat exchange, the number of battery cells in contact with each other can be set according to the extension length of the channel body, thereby meeting the heat exchange requirements of each battery cell and further improving the temperature uniformity among the battery cells.

[0108] This application provides an electrical device that uses the battery device disclosed herein as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0109] For ease of explanation, the following embodiments use a vehicle as an example to describe in detail the structure of the electrical device 1 and the battery device 1000 of this application.

[0110] Please refer to Figure 1, which is a schematic diagram of the structure of an electrical device 1 as a vehicle according to some embodiments of this application. The vehicle can be a gasoline vehicle, a natural gas vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle is equipped with a battery device 1000, which can be located at the bottom, front, or rear of the vehicle. The battery device 1000 can be used to supply power to the vehicle; for example, the battery device 1000 can serve as the vehicle's operating power source. The vehicle may also include a controller 2000 and a motor 3000. The controller 2000 is used to control the battery device 1000 to supply power to the motor 3000, for example, for the vehicle's starting, navigation, and driving power needs. In some embodiments of this application, the battery device 1000 can not only serve as the vehicle's operating power source but also as the vehicle's driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to the vehicle.

[0111] The battery device 1000 according to an embodiment of the first aspect of this application is described below with reference to Figures 2-7. Figure 2 is a structural schematic diagram of the battery device 1000 according to an embodiment of this application; Figure 3 is an exploded view of the battery device 1000 according to an embodiment of this application with only the top cover 120 exploded; Figure 4 is an exploded view of the battery device 1000 according to an embodiment of this application; Figure 5 is a schematic diagram of a plurality of battery cell assemblies 200 and heat exchange assemblies 300 of the battery device 1000 according to an embodiment of this application; Figure 6 is a partially enlarged view of the battery cell assemblies 200 and heat exchange assemblies 300 shown in Figure 5; Figure 7 is an exploded view of the battery device 1000 according to an embodiment of this application from another angle.

[0112] For ease of description, the length direction of the battery device 1000 is defined as the first direction X, the width direction as the second direction Y, and the height direction as the third direction Z. In a specific example, the length direction (i.e., the first direction X) of the battery device 1000 can be the front-to-back direction of the vehicle (electrical device 1), the width direction (i.e., the second direction Y) of the battery device 1000 can be the left-to-right direction of the vehicle (electrical device 1), and the height direction (i.e., the third direction Z) of the battery device 1000 can be the up-down direction of the vehicle (electrical device 1). The first direction X, the second direction Y, and the third direction Z are all perpendicular to each other.

[0113] This application provides a battery device 1000, as shown in Figures 2-7. The battery device 1000 includes: a housing 100, a battery cell assembly 200, and a heat exchange assembly 300. A battery cell assembly 200 is disposed within a housing 100, and the battery cell assembly 200 includes multiple battery cells 210. A heat exchange assembly 300 is used for heat exchange with the battery cells 210, and the heat exchange assembly 300 includes multiple heat exchange channels 31 connected in parallel. The inlet 3103 and outlet 3104 of the multiple heat exchange channels 31 are arranged at the same end of the battery device 1000 in a first direction X, where the first direction X is the length direction of the battery device 1000. At least a portion of each heat exchange channel 31 is formed as a channel body 311, wherein at least two channels 311 are arranged sequentially along the first direction X, where the first direction X is the length direction of the battery device 1000, and the second direction Y is the width direction of the battery device 1000. The ratio of the length dimension of the housing 100 in the first direction X to the width dimension of the housing 100 in the second direction Y is greater than 2. The number of battery cells 210 that are attached to and exchanged with the heat by at least two channel bodies 311 is different.

[0114] As shown in Figures 2 and 3, the housing 100 defines a receiving cavity, within which the battery cell assembly 200 is disposed. The heat exchange assembly 300 can be disposed either within or outside the receiving cavity of the housing 100. In some examples, the housing 100 can be made of aluminum alloy to reduce its weight while maintaining structural strength and increasing the energy density of the battery device 1000.

[0115] In other examples, the housing 100 may also be a composite material, which may be made of a material that has high strength, is lightweight and has good corrosion resistance.

[0116] Referring to Figures 2 and 3, the battery cell assembly 200 includes a plurality of battery cells 210, which can be arranged sequentially along the length, width, and / or thickness directions of the battery cells 210. The battery cell assembly 200 may include two, four, six, ten, twelve, eighteen, twenty-four, thirty, or more battery cells 210. It should be noted that the number of battery cells 210 in this embodiment includes, but is not limited to, the implementation methods listed above. Any two battery cells 210 in the battery cell assembly 200 can be connected in series or in parallel.

[0117] Referring to Figure 4, the heat exchange assembly 300 is used for heat exchange with the battery cell 210. For example, the heat exchange assembly 300 can be directly attached to the battery cell 210 for heat exchange, or it can be spaced apart from the battery cell 210 for heat exchange. The heat exchange assembly 300 may include a cold plate, within which a heat exchange channel 31 can be defined. The heat exchange assembly 300 may also include a heat exchange tube 30, within which a heat exchange channel 31 can be defined. The heat exchange channel 31 is used to conduct a heat exchange medium, which can be a liquid, such as water or a mixture of water and other liquids. As the heat exchange medium flows along the heat exchange channel 31, it can carry away heat generated by the battery cell 210 or heat the battery cell 210.

[0118] The number of heat exchange channels 31 in the heat exchange component 300 can be two, three, four, five, six, seven, eight or more, etc.

[0119] Multiple heat exchange channels 31 are arranged in parallel, meaning that the inlet 3103 of each heat exchange channel 31 is connected to the liquid inlet of the heat exchange component 300, and the outlet 3104 of each heat exchange channel 31 is connected to the liquid outlet of the heat exchange component 300. This allows the flow rate of the heat exchange medium in each heat exchange channel 31 to be more consistent, achieving uniform heat exchange for the battery cell 210. Furthermore, it reduces the pressure drop in a single heat exchange channel 31, improving heat exchange efficiency.

[0120] The main body 311 of the heat exchange channel 31 refers to the channel assembly formed by at least most of the channels in the heat exchange channel 31 being arranged together. The heat exchange medium exchanges with the battery cell 210 within the main body 311 is greater than the heat exchange medium exchanges with the battery cell 210 within the remaining parts of the heat exchange channel 31 excluding the main body 311. Furthermore, the heat exchange contact area between the main body 311 and the battery cell 210 is greater than the heat exchange contact area between the remaining parts of the heat exchange channel 31 excluding the main body 311 and the battery cell 210.

[0121] In some examples, along the flow direction of the heat exchange medium, the total extension length within the main body 311 is greater than the total extension length of the remaining parts of the heat exchange channel 31 excluding the main body 311, and the flow time of the heat exchange medium within the main body 311 is greater than the flow time of the heat exchange medium within the remaining parts of the heat exchange channel 31 excluding the main body 311.

[0122] In some examples, each heat exchange channel 31 has a channel body 311. For a heat exchange channel 31, only a part of the heat exchange channel 31 may be formed as the channel body 311, or all the channels of the heat exchange channel 31 may be formed together as the channel body 311.

[0123] The multiple heat exchange channels 31 have multiple channel bodies 311. Among the multiple channel bodies 311, at least two channel bodies 311 are arranged along the first direction X. That is, a portion of the multiple channel bodies 311, such as two, three or four channel bodies 311, can be arranged along the length direction of the battery device 1000, or all the channel bodies 311 in the multiple channel bodies 311 can be arranged sequentially along the length direction of the battery device 1000.

[0124] For example, when multiple heat exchange channels 31 are integrally formed as channel bodies 311, the multiple heat exchange channels 31 can be arranged along the length direction of the battery device 1000. When multiple heat exchange channels 31 are partially formed as channel bodies 311, the channel bodies 311 of the multiple heat exchange channels 31 are arranged along the length direction of the battery device 1000.

[0125] In this application, the first direction X is the length direction of the battery device 1000, and multiple flow channel bodies 311 are arranged along the length direction of the battery device 1000. In this way, multiple battery cells 210 can be divided into multiple regions according to the length direction of the battery device 1000. Each region is provided with one or more flow channel bodies 311 of heat exchange flow channels 31 for heat exchange with the battery cells 210 in that region. This is beneficial to improving the temperature uniformity of the battery device 1000 in the length direction.

[0126] Since the multiple heat exchange channels 31 of this application all form channel bodies 311, and the channel bodies 311 are arranged more concentratedly than other parts of the heat exchange channels 31, the channel bodies 311 can undertake more heat exchange functions in the heat exchange channels 31. Therefore, by limiting the arrangement direction of the channel bodies 311 in different heat exchange channels 31, it is possible to achieve precise control of the heat exchange efficiency between different heat exchange channels 31 and the corresponding heat exchange areas. Furthermore, by setting the arrangement direction of the channel bodies 311 in the heat exchange channels 31 to be along the length of the housing 100, it is possible to improve the heat exchange efficiency between the heat exchange channels 31 and the battery cells 210 in the housing 100 while ensuring a compact arrangement of the battery cells 210 in the housing 100.

[0127] As shown in Figure 5, the inlets 3103 and outlets 3104 of multiple heat exchange channels 31 are all located at the same end of the battery device 1000 in the first direction X. For example, the first direction X is the front-to-back direction of the battery device 1000. The inlets 3103 and outlets 3104 of the multiple heat exchange channels 31 can be arranged at the front end of the battery device 1000 or at the rear end of the battery device 1000. In this way, the inlets 3103 and outlets 3104 of the multiple heat exchange channels 31 can be centrally located, which facilitates the centralized connection of multiple heat exchange channels 31 to external pipelines, simplifies the structure and layout of external pipelines, reduces installation and maintenance difficulty, and also reduces the arrangement space of inlets 3103, outlets 3104 and external pipes, resulting in a compact structure, reduced space occupation, and improved space utilization.

[0128] Furthermore, since the inlet 3103 and outlet 3104 of the multiple heat exchange channels 31 are all located at one end of the length direction of the housing 100, the heat exchange medium in the external pipeline can enter each heat exchange channel 31 from one end of the length direction of the housing 100. This not only facilitates the centralized input of heat exchange medium into multiple heat exchange channels 31, but also makes the temperature and flow rate of the heat exchange medium entering the inlet 3103 of each heat exchange channel 31 more consistent, making the heat exchange capacity of multiple heat exchange channels 31 more balanced and improving the temperature uniformity among the battery cells 210 corresponding to each heat exchange channel 31.

[0129] Furthermore, since each heat exchange channel 31 has a channel body 311, and the multiple channel bodies 311 of the multiple heat exchange channels 31 are arranged along the length direction of the housing 100, and the inlet 3103 and outlet 3104 of the multiple heat exchange channels 31 are all located at one end of the length direction of the housing 100, then the channel bodies 311 arranged at intervals with the inlet 3103 and outlet 3104 along the length direction of the housing 100 all need to be connected to the inlet 3103 and outlet 3104 through channel sections (such as the first connecting part and the second connecting part described below). In this way, the channel sections connecting the channel bodies 311 with the inlet 3103 and outlet 3104 can increase the extension length of the heat exchange channel 31, extend the flow path of the heat exchange medium, and improve the heat exchange efficiency.

[0130] The flow channel body 311 closest to the inlet 3103 and outlet 3104 is designated as the first flow channel body. The flow channel body 311 located on the side of the first flow channel body away from the inlet 3103 and outlet 3104 is designated as the second flow channel body. Since the flow channel body 311 is an assembly of flow channels concentrated together in the heat exchange flow channel 31, when the second flow channel body is connected to the inlet 3103 and outlet 3104 through a flow channel section, the flow channel section can only be arranged on one side of the first flow channel body in the width direction of the housing 100. Therefore... The flow channel section connected to the inlet 3103 and the outlet 3104 can be set closer to the edge of the housing 100. In this way, under heating conditions, the heat exchange medium with a higher temperature entering from the inlet 3103 can exchange heat with the battery cells 210 near the edge of the housing 100 to compensate for the heat lost by the battery cells 210 near the edge of the housing 100 due to heat dissipation to the environment, thereby improving the temperature uniformity between the battery cells 210 at the edge of the housing 100 and the battery cells 210 near the middle region of the housing 100.

[0131] In addition, when the flow channel section connected to the inlet 3103 and the second flow channel body and the flow channel section connected to the outlet 3104 and the second flow channel body are arranged on the same side of the first flow channel body, the two flow channel sections can be arranged adjacently and side by side. Since the two flow channel sections are respectively connected to the inlet 3103 and the outlet 3104 of the heat exchange flow channel, the temperature difference is the largest. At this time, the heat exchange temperature between the two flow channel sections and the corresponding heat exchange area can be approximated as the average temperature of the two flow channel sections. In this way, the probability of local overheating or underheating of the battery device 1000 can be reduced, and the temperature uniformity performance between battery cells 210 can be improved.

[0132] At least two flow channel bodies 311 have different numbers of battery cells 210 that are attached to each other for heat exchange. Specifically, the flow channel body 311 extends on the surface of the battery cell assembly 200. The number of battery cells 210 that are attached to each flow channel body 311 for heat exchange is the number of battery cells 210 that the flow channel body 311 passes through from one end to the other along the fluid flow direction.

[0133] For example, in multiple flow channel bodies 311, only two or more of the flow channel bodies 311 may have different numbers of battery cells 210 attached to them for heat exchange, while the remaining flow channel bodies 311 may have the same number of battery cells 210 attached to them for heat exchange. Alternatively, all flow channel bodies 311 may have different numbers of battery cells 210 attached to them for heat exchange.

[0134] Since multiple flow channel bodies 311 are arranged sequentially along the first direction X, the heat exchange areas corresponding to each flow channel body 311 are also arranged sequentially along the first direction X. For different heat exchange areas arranged along the first direction X, the heat exchange requirements of the battery cells 210 are different. Therefore, the number of battery cells 210 that are attached to each flow channel body 311 for heat exchange can be set according to the heat exchange requirements of the battery cells 210 in different heat exchange areas, thereby improving the heat exchange efficiency of the battery cells 210 in the corresponding heat exchange areas and improving the temperature uniformity performance between each heat exchange area.

[0135] Furthermore, since the inlet 3103 and outlet 3104 of the multiple heat exchange channels 31 are all arranged at the same end of the battery device 1000 in the first direction X, the length of the channel section (e.g., the first connecting part 312 and the second connecting part 313 described below) used to connect the inlet 3103 and outlet 3104 of the channel body 311 is different for different heat exchange channels 31. The extension length of the multiple channel bodies 311 along the fluid flow direction can also be different. Therefore, the number of battery cells 210 that are attached to the heat exchange of at least two channel bodies 311 is different. The number of battery cells 210 that are attached to the heat exchange can be set according to the extension length of the channel body 311, so as to meet the heat exchange requirements of each battery cell 210 and improve the temperature uniformity performance between battery cells 210.

[0136] In the above technical solution, since the heat exchange channel 31 forms a channel body 311, and the channel bodies 311 of multiple heat exchange channels 31 are arranged along the length direction of the battery device 1000, and the inlet 3103 and outlet 3104 of multiple heat exchange channels 31 are all located at the same end of the battery device 1000 in the first direction X, this not only allows the inlet 3103 and outlet 3104 of multiple heat exchange channels 31 to be centrally located, simplifying the structure and layout of external pipelines, reducing installation and maintenance difficulty, and reducing space occupation, but also allows for different channel bodies 31 1 can also exchange heat with different areas of the battery device 1000 along the length direction, reduce the temperature difference between battery cells 210 at different positions along the length direction of the battery device 1000, improve the temperature uniformity of the battery device 1000 along the length direction, improve the temperature uniformity between the battery cells 210 corresponding to each heat exchange channel 31, improve the temperature uniformity between the battery cells 210 at the edge of the housing 100 and the battery cells 210 near the middle of the housing 100, and improve the temperature uniformity performance of the battery device 1000. Meanwhile, by varying the number of battery cells 210 that are attached to and heat-exchange in at least two flow channel bodies 311, the number of battery cells 210 attached to and heat-exchange in each flow channel body 311 can be set according to the heat exchange requirements of battery cells 210 in different heat exchange areas, thereby improving the heat exchange efficiency of battery cells 210 in the corresponding heat exchange areas. The number of battery cells 210 attached to and heat-exchange in each flow channel body 311 can also be set according to the extension length of the flow channel body 311, thereby meeting the heat exchange requirements of each battery cell 210 and improving the temperature uniformity performance between battery cells 210.

[0137] In some embodiments of this application, referring to FIG5, the number of multiple flow channel bodies 311 that are attached to heat exchanged battery cells 210 is reduced in a direction along the first direction X and gradually away from the inlet 3103 and outlet 3104.

[0138] For example, the first direction X is the front-to-back direction. The inlet 3103 and outlet 3104 of the heat exchange channel 31 are both arranged on the front side of the battery device 1000. In the front-to-back direction, the number of battery cells 210 that are attached to the heat exchange of the multiple channel bodies 311 can be reduced in a stepwise manner or sequentially.

[0139] As the distance between the multiple flow channel bodies 311 and the inlet 3103 and outlet 3104 gradually increases in the direction of gradually moving away from the heat exchange flow channel 31, the length of the flow channel segment connecting the multiple flow channel bodies 311 and the inlet 3103 and outlet 3104 gradually increases. Under the premise that the extension length of each heat exchange flow channel 31 is roughly the same, the extension length of the multiple flow channel bodies 311 gradually decreases, and the number of battery cells 210 that the multiple flow channel bodies 311 are in contact with for heat exchange decreases. This can improve the heat exchange efficiency of a single battery cell 210 and improve the temperature uniformity among the battery cells 210.

[0140] In the above technical solution, since the number of battery cells 210 that are attached to the heat exchange of the multiple flow channel bodies 311 is reduced in the direction of gradually moving away from the inlet 3103 and outlet 3104 of the heat exchange flow channel 31, the extension length of the multiple flow channel bodies 311 can be reduced sequentially or in a stepwise manner, so that the extension length of the multiple heat exchange flow channels 31 is roughly the same, thereby making the pressure drop and flow resistance of the multiple heat exchange flow channels 31 roughly the same, thereby improving the heat exchange uniformity of the multiple heat exchange flow channels 31 and improving the temperature uniformity among the battery cells 210.

[0141] In some embodiments of this application, referring to FIG5, the number of battery cells 210 that the multiple flow channel bodies 311 are attached to for heat exchange decreases sequentially in the direction along the first direction X and gradually away from the inlet 3103 and outlet 3104.

[0142] In the above technical solution, since the number of battery cells 210 that the multiple flow channel bodies 311 are attached to for heat exchange decreases sequentially in the direction along the first direction X and gradually away from the inlet 3103 and outlet 3104, the extension length of the multiple heat exchange flow channels 31 can be made more consistent, thereby improving the heat exchange uniformity among the multiple heat exchange flow channels 31 and further improving the temperature uniformity among the battery cells 210.

[0143] In some embodiments of this application, referring to FIG5, at least two flow channel bodies 311 have different heat exchange contact areas with the battery cell assembly 200.

[0144] For example, the heat exchange assembly 300 includes a heat exchange tube 30, which defines a heat exchange flow channel 31. The flow channel body 311 of the heat exchange flow channel 31 extends on the surface of the battery cell assembly 200 in the third direction Z. The area of ​​the tube segment of the heat exchange tube 30 defining the flow channel body 311 in contact with the battery cell assembly 200 is the heat exchange contact area between the flow channel body 311 and the battery cell assembly 200.

[0145] For example, among the multiple flow channel bodies 311, only two or more of the flow channel bodies 311 may have different heat exchange contact areas with the battery cell assembly 200, while the remaining flow channel bodies 311 may have the same heat exchange contact area with the battery cell assembly 200. Alternatively, all the flow channel bodies 311 may have different heat exchange contact areas with the battery cell assembly 200.

[0146] In the above technical solution, since the heat exchange contact areas between at least two flow channel bodies 311 and the battery cell assembly 200 are different, the heat exchange contact area between each flow channel body 311 and the battery cell assembly 200 can be set according to the heat exchange requirements of the battery cells 210 in different heat exchange areas, thereby improving the heat exchange efficiency of the battery cells 210 in different heat exchange areas and improving the temperature uniformity performance between various heat exchange areas. Furthermore, the heat exchange contact area with the battery cell assembly 200 can be set according to the extension length of each flow channel body 311, thereby meeting the heat exchange requirements of each battery cell 210 and improving the temperature uniformity performance between the battery cells 210.

[0147] In some embodiments of this application, referring to FIG5, the heat exchange contact area between the plurality of flow channel bodies 311 and the battery cell assembly 200 is reduced in a direction along the first direction X and gradually away from the inlet 3103 and the outlet 3104.

[0148] For example, the first direction X is the front-to-back direction. The inlet 3103 and outlet 3104 of the heat exchange channel 31 are both arranged on the front side of the battery device 1000. In the front-to-back direction, the heat exchange contact area between the multiple channel bodies 311 and the battery cell assembly 200 can be reduced in a stepwise manner or sequentially.

[0149] In the above technical solution, since the heat exchange contact area between the multiple flow channel bodies 311 and the battery cell assembly 200 is reduced in the direction of gradually moving away from the inlet 3103 and outlet 3104 of the heat exchange channel 31, the length of the multiple flow channel bodies 311 can be reduced, and the extension length of the multiple heat exchange channels 31 can be made to be roughly the same, thereby making the pressure drop and flow resistance of the multiple heat exchange channels 31 roughly the same, thereby improving the heat exchange uniformity of the multiple heat exchange channels 31 and improving the temperature uniformity between the battery cells 210.

[0150] In some embodiments of this application, referring to FIG5, the heat exchange contact area between the plurality of flow channel bodies 311 and the battery cell assembly 200 gradually decreases along the first direction X and gradually away from the inlet 3103 and outlet 3104.

[0151] In the above technical solution, since the heat exchange contact area between the multiple flow channel bodies 311 and the battery cell assembly 200 gradually decreases along the first direction X and gradually away from the inlet 3103 and outlet 3104, the extension length of the multiple flow channel bodies 311 can be gradually reduced, further making the extension length of the multiple heat exchange channels 31 more consistent, improving the heat exchange uniformity between the multiple heat exchange channels 31, and further improving the temperature uniformity between the battery cells 210.

[0152] In some embodiments of this application, referring to FIG5, at least two flow channel bodies 311 have different outer contour widths in the first direction X.

[0153] The outer contour width of the flow channel body 311 in the first direction X refers to the distance between one end edge and the other end edge of the flow channel body 311 in the first direction X. Among multiple flow channel bodies 311, only two or more may have different outer contour widths in the first direction X, while the remaining flow channel bodies 311 may have the same outer contour width in the first direction X; alternatively, all flow channel bodies 311 may have different outer contour widths in the first direction X.

[0154] Since at least two flow channel bodies 311 have different outer contour widths in the first direction X, when the flow channel bodies 311 are arranged with approximately the same spacing, the wider the outer contour width of the flow channel body 311, the longer the length of the flow channel body 311, and the larger the heat exchange contact area with the battery cell assembly 200. In this way, according to the heat exchange requirements of the battery cells 210 at different positions in the length direction of the battery device 1000, multiple heat exchange regions with different widths along the length direction of the battery device 1000 can be divided, and flow channel bodies 311 with different outer contour widths in the first direction X can be matched with the corresponding heat exchange regions, thereby improving the heat exchange efficiency of the battery cells 210 in different heat exchange regions.

[0155] In the above technical solution, at least two flow channel bodies 311 have different outer contour widths in the first direction X. Therefore, according to different heat exchange requirements, the battery device 1000 can be divided into multiple heat exchange regions with different widths along the first direction X. Flow channel bodies 311 with different outer contour widths in the first direction X are matched with the corresponding heat exchange regions, thereby improving the heat exchange efficiency of battery cells 210 in different heat exchange regions and improving the temperature uniformity among battery cells 210.

[0156] In some embodiments of this application, referring to FIG5, the outer contour width of the plurality of flow channel bodies 311 in the first direction X becomes smaller in a direction that is gradually away from the inlet 3103 and the outlet 3104.

[0157] For example, the first direction X is the front-to-back direction. The inlet 3103 and outlet 3104 of the heat exchange channel 31 are both arranged on the front side of the battery device 1000. In the front-to-back direction, the outer contour width of the multiple channel bodies 311 in the first direction X can be reduced in a step-like manner or in sequence.

[0158] In the above technical solution, since the outer contour width of the multiple flow channel bodies 311 in the first direction X becomes smaller in the direction of gradually moving away from the inlet 3103 and outlet 3104 of the heat exchange flow channel 31, the extension length of the multiple flow channel bodies 311 can be reduced in the direction of gradually moving away from the inlet 3103 and outlet 3104, so that the extension length of the multiple heat exchange flow channels 31 is roughly the same, thereby making the pressure drop and flow resistance of the multiple heat exchange flow channels 31 roughly the same, thereby improving the heat exchange uniformity of the multiple heat exchange flow channels 31 and improving the temperature uniformity between battery cells 210.

[0159] In some embodiments of this application, referring to FIG5, in a direction along the first direction X and gradually away from the inlet 3103 and outlet 3104, the outer contour width of a plurality of flow channel bodies 311 in the first direction X decreases sequentially.

[0160] In the above technical solution, since the outer contour width of the multiple flow channel bodies 311 decreases sequentially in the first direction X and gradually moves away from the inlet 3103 and outlet 3104, the extension length of the multiple flow channel bodies 311 can be gradually reduced, further making the extension length of the multiple heat exchange channels 31 more consistent, improving the heat exchange uniformity between the multiple heat exchange channels 31, and further improving the temperature uniformity between the battery cells 210.

[0161] In some embodiments of this application, referring to FIG5, there are two heat exchange channels 31, including a first heat exchange channel 31a and a second heat exchange channel 31b. The channel body 311 of the first heat exchange channel 31a is located closest to the inlet 3103 and the outlet 3104. The ratio of the outer contour width of the channel body 311 of the second heat exchange channel 31b in the first direction X to the total outer contour width of all battery cell assemblies 200 of the battery device 1000 in the first direction X is greater than or equal to 1 / 3 and less than 1 / 2.

[0162] For example, in the first direction X, the ratio of the outer contour width of the flow channel body 311 of the second heat exchange flow channel 31b to the total outer contour width of all battery cell assembly 200 can be 0.34, 0.36, 0.38, 0.4, 0.42, 0.44, 0.46, 0.48 or 0.5.

[0163] Furthermore, the ratio of the outer contour width of the main body 311 of the first heat exchange channel 31a in the first direction X to the total outer contour width of all battery cell assemblies 200 in the first direction X can be greater than 1 / 2 and less than or equal to 2 / 3. For example, in the first direction X, the ratio of the outer contour width of the main body 311 of the first heat exchange channel 31a to the total outer contour width of all battery cell assemblies 200 can be 0.52, 0.54, 0.56, 0.58, 0.6, 0.62, 0.64 or 0.66.

[0164] Since the main body 311 of the first heat exchange channel 31a is located close to the inlet 3103 and the outlet 3104, while the main body 311 of the second heat exchange channel 31b is arranged on the side of the first heat exchange channel 31a away from the inlet 3103 and the outlet 3104 in the first direction X, the main body 311 of the second heat exchange channel 31b needs to be connected to the inlet 3103 and the outlet 3104 through a channel section extending along the first direction X.

[0165] In the above technical solution, by making the ratio of the outer contour width of the main body 311 of the second heat exchange channel 31b in the first direction X to the total outer contour width of all battery cell components 200 in the first direction X greater than or equal to 1 / 3 and less than 1 / 2, the extension length of the first heat exchange channel 31a and the extension length of the second heat exchange channel 31b can be made approximately the same, thereby making the flow resistance and pressure drop of the first heat exchange channel 31a and the second heat exchange channel 31b tend to be consistent, improving the consistency of heat exchange efficiency between the first heat exchange channel 31a and the second heat exchange channel 31b, thereby improving the heat exchange uniformity between the first heat exchange channel 31a and the second heat exchange channel 31b.

[0166] In some embodiments of this application, referring to FIG5, there are two heat exchange channels 31, namely a first heat exchange channel 31a and a second heat exchange channel 31b. The inlet 3103 and outlet 3104 of the two heat exchange channels 31 are located at the same end of the battery device 1000 in the first direction X. The channel body 311 of the first heat exchange channel 31a is arranged close to the inlet 3103 and the outlet 3104. The ratio of the extension length of the second heat exchange channel 31b to the extension length of the first heat exchange channel 31a is greater than or equal to 1 and less than or equal to 1.2.

[0167] For example, the first direction X is the front-to-back direction, the heat exchange component 300 has two heat exchange channels 31, the inlet 3103 and outlet 3104 of the two heat exchange channels 31 are arranged at the front end of the battery device 1000, the two heat exchange channels 31 are the first heat exchange channel 31a and the second heat exchange channel 31b, and the channel body 311 of the first heat exchange channel 31a is arranged in front of the body of the second heat exchange channel 31b.

[0168] Furthermore, in the direction extending from the inlet 3103 to the outlet 3104 of the heat exchange channel 31, the ratio of the extension length of the second heat exchange channel 31b to the extension length of the first heat exchange channel 31a is 1-1.2. That is, the extension length of the second heat exchange channel 31b is greater than or equal to the extension length of the first heat exchange channel 31a, and less than or equal to 1.2 times the extension length of the first heat exchange channel 31a.

[0169] For example, the ratio of the extension length of the second heat exchange channel 31b to the extension length of the first heat exchange channel 31a can be 1.02, 1.04, 1.06, 1.08, 1.0, 1.12, 1.14, 1.16, 1.18 or 2.0.

[0170] It should be noted that since both the first heat exchange channel 31a and the second heat exchange channel 31b extend in a bent manner, and the main body 311 of the first heat exchange channel 31a is arranged in front of the main body 311 of the second heat exchange channel 31b, and since the inlet 3103 and outlet 3104 of both the first heat exchange channel 31a and the second heat exchange channel 31b are arranged in front of the housing 100, when the extension lengths of the first heat exchange channel 31a and the second heat exchange channel 31b are equal, the total length of the straight pipe section of the second heat exchange channel 31b will be greater than the total length of the straight pipe section of the first heat exchange channel 31a, and the number of bends in the first heat exchange channel 31a will be greater than the number of bends in the second heat exchange channel 31b. The longer the extension length, the greater the pressure drop and flow resistance; the more bends, the greater the pressure drop and flow resistance.

[0171] Therefore, the extension length of the second heat exchange channel 31b is greater than or equal to the extension length of the first heat exchange channel 31a and less than or equal to 1.2 times the extension length of the first heat exchange channel 31a. This can make the flow resistance and pressure drop of the heat exchange medium relatively uniform in the first heat exchange channel 31a and the second heat exchange channel 31b, thereby improving the temperature uniformity between the battery cell 210 corresponding to the first heat exchange channel 31a and the battery cell 210 corresponding to the second heat exchange channel 31b.

[0172] In the above technical solution, the ratio of the extension length of the second heat exchange channel 31b to the extension length of the first heat exchange channel 31a is greater than or equal to 1 and less than or equal to 1.2, which can make the flow resistance and pressure drop of the heat exchange medium in the first heat exchange channel 31a and the second heat exchange channel 31b relatively uniform, thereby improving the temperature uniformity between battery cells 210.

[0173] In some embodiments of this application, referring to FIG5, a plurality of heat exchange channels 31 include a first heat exchange channel 31a and a second heat exchange channel 31b. The channel body 311 of the first heat exchange channel 31a is located closest to the inlet 3103 and the outlet 3104. The second heat exchange channel 31b further includes a first connecting portion 312 and a second connecting portion 313. The first connecting portion 312, the channel body 311 and the second connecting portion 313 are connected in sequence. The end of the first connecting portion 312 away from the channel body 311 forms the inlet 3103, and the end of the second connecting portion 313 away from the channel body 311 forms the outlet 3104. The first connecting portion 312 and the second connecting portion 313 both extend along the first direction X.

[0174] The number of first heat exchange channels 31a is one, and the number of second heat exchange channels 31b can be one or more. When there are multiple second heat exchange channels 31b, the main bodies of the multiple second heat exchange channels 31b are arranged sequentially along the first direction X.

[0175] For example, the inlet 3103 and outlet 3104 of the multiple heat exchange channels 31 are arranged at the front end of the battery device 1000, and the channel bodies 311 of the multiple heat exchange channels 31 are arranged behind the inlet 3103 and outlet 3104, and are arranged sequentially in the front-back direction. Among them, the channel body 311 of the first heat exchange channel 31a is located at the foremost of the multiple channel bodies 311, and the channel body 311 of the second heat exchange channel 31b is arranged behind the channel body 311 of the first heat exchange channel 31a.

[0176] Furthermore, for the first heat exchange channel 31a, the entire channel of the first heat exchange channel 31a is the channel body 311, and the two ends of the channel body 311 are respectively formed as the inlet 3103 and the outlet 3104 of the first heat exchange channel 31a.

[0177] For the second heat exchange channel 31b, the channel body 311 of the second heat exchange channel 31b is arranged behind the first heat exchange channel 31a. In order to arrange the inlet 3103 and outlet 3104 of the second heat exchange channel 31b in front of the first heat exchange channel 31a, the second heat exchange channel 31b also includes a first connecting part 312 and a second connecting part 313. The rear end of the first connecting part 312 and the rear end of the second connecting part 313 are respectively connected to the two ends of the channel body 311. The front end of the first connecting part 312 extends to the front of the first heat exchange channel 31a and forms the inlet 3103 of the second heat exchange channel 31b. The front end of the second connecting part 313 extends to the front of the first heat exchange channel 31a and forms the outlet 3104 of the second heat exchange channel 31b.

[0178] In the first direction X, the first connecting portion 312 can extend along a straight line or along a curve and / or a broken line, and the second connecting portion 313 can extend along a straight line or along a curve and / or a broken line.

[0179] In some specific examples, the first connecting portion 312 includes a horizontal portion 3101 and a vertical portion 3102. One end of the vertical portion 3102 of the first connecting portion 312 is connected to one end of the flow channel body 311 of the second heat exchange flow channel 31b, and the other end of the vertical portion 3102 of the first connecting portion 312 extends in a straight line along a first direction X toward the inlet 3103 and the outlet 3104. The horizontal portion 3101 of the first connecting portion 312 extends along a second direction Y, and one end of the horizontal portion 3101 of the first connecting portion 312 is connected to the other end of the vertical portion 3102 of the first connecting portion 312. The other end of the horizontal portion 3101 of the first connecting portion 312 forms the inlet 3103 of the second heat exchange flow channel 31b. Further, the horizontal portion 3101 and the vertical portion 3102 of the first connecting portion 312 are arranged perpendicular to each other, and the connection position of the horizontal portion 3101 and the vertical portion 3102 of the first connecting portion 312 is bent into a quarter-circle arc shape.

[0180] In some specific examples, the second connecting portion 313 includes a horizontal portion 3101 and a vertical portion 3102. One end of the vertical portion 3102 of the second connecting portion 313 is connected to the other end of the flow channel body 311 of the second heat exchange flow channel 31b, and the other end of the vertical portion 3102 of the second connecting portion 313 extends in a straight line along a first direction X toward the inlet 3103 and the outlet 3104. The horizontal portion 3101 of the second connecting portion 313 extends along a second direction Y, and one end of the horizontal portion 3101 of the second connecting portion 313 is connected to the other end of the vertical portion 3102 of the second connecting portion 313. The other end of the horizontal portion 3101 of the second connecting portion 313 forms the outlet 3104 of the second heat exchange flow channel 31b. Further, the horizontal portion 3101 and the vertical portion 3102 of the second connecting portion 313 are arranged perpendicular to each other, and the connection position of the horizontal portion 3101 and the vertical portion 3102 of the second connecting portion 313 is bent into a quarter-circle arc shape.

[0181] The first connecting part 312 and the second connecting part 313 may be located on the same side of the first heat exchange channel 31a in the second direction Y, and the first connecting part 312 and the second connecting part 313 may be located on opposite sides of the second heat exchange channel 31b in the second direction Y.

[0182] When the heat exchange medium flows into the second heat exchange channel 31b, the heat exchange medium first enters the first connecting part 312 from the inlet 3103, flows into the channel body 311 through the first connecting part 312, then flows into the second connecting part 313, and finally flows out from the outlet 3104. The heat exchange medium flowing through the first connecting part 312, the channel body 311 and the second connecting part 313 exchanges heat with the battery cell 210, so that the battery cell 210 can operate within a suitable temperature range.

[0183] Since the inlet 3103 and outlet 3104 are located at one end of the housing 100 in the first direction X, and the flow body 311 of the second heat exchange channel 31b is located on the side of the flow body 311 of the first heat exchange channel 31a away from the inlet 3103 and outlet 3104, in order to connect the inlet 3103 and outlet 3104 with the flow body 311 of the second heat exchange channel 31b, the first connecting part 312 and the second connecting part 313 need to be arranged on one or both sides of the flow body 311 of the first heat exchange channel 31a in the second direction Y. That is, the first connecting part 312 and the second connecting part 313 are both closer to the edge of the housing 100 than the flow body 311 of the first heat exchange channel 31a and the flow body 311 of the second heat exchange channel 31b.

[0184] When the battery device 1000 is in a low-temperature heating condition, the heat exchange medium with a higher temperature can first enter the first connection part 312 from the inlet 3103. Inside, because the battery cell 210 corresponding to the first connection part 312 for heat exchange is closer to the edge of the housing 100, it dissipates more heat to the external environment and its temperature drops faster. The higher temperature heat exchange medium inside the first connection part 312 can not only raise the temperature of the battery cell 210 near the edge of the housing 100, but also make up for the heat lost by the battery cell 210 near the edge of the housing 100 due to heat dissipation to the external environment, thus meeting its heating needs. As a result, the temperature difference between the peripheral battery cell 210 near the edge of the housing 100 and in contact with the first connection part 312 for heat exchange and the battery cell 210 near the middle of the housing 100 (e.g., the battery cell 210 corresponding to the heat exchange of the main body 311 of the first heat exchange channel 31a and the battery cell 210 corresponding to the heat exchange of the main body 311 of the second heat exchange channel 31b) can be reduced, thereby improving the temperature uniformity among the battery cells 210.

[0185] When the battery device 1000 is in a high-temperature cooling condition, the heat exchange medium can flow into the first connecting part 312, the flow channel body 311 and the second connecting part 313 in sequence. As the heat exchange medium flows, the temperature of the heat exchange medium gradually increases, that is, the temperature in the first connecting part 312 < the temperature in the flow channel body 311 < the temperature in the second connecting part 313. Specifically, for the second connecting part, since the second connecting part is located closer to the edge of the housing than the main body of the first heat exchange channel, the battery cell 210 corresponding to the second connecting part 313 that is in contact with the heat exchange is closer to the edge of the housing 100. It can dissipate some heat to the external environment through the housing 100, resulting in better natural heat dissipation. At this time, the slightly higher temperature heat exchange medium in the second connecting part 313 can still meet the heat dissipation requirements of the corresponding battery cell 210 near the edge of the housing 100. Thus, the temperature difference between the battery cell 210 near the edge of the housing 100 and in contact with the second connecting part 313 and the battery cell 210 near the middle of the housing 100 (such as the battery cell 210 corresponding to the heat exchange of the main body 311 of the first heat exchange channel 31a and the battery cell 210 corresponding to the heat exchange of the main body 311 of the second heat exchange channel 31b) can be reduced, thereby improving the temperature uniformity among the battery cells 210.

[0186] When the first connecting part 312 and the second connecting part 313 are arranged on the same side of the flow channel body 311 of the first heat exchange channel 31a in the width direction of the housing 100, the first connecting part 312 and the second connecting part 313 are arranged side by side. Since the first connecting part 312 and the second connecting part 313 are respectively connected to the inlet 3103 and the outlet 3104 of the second heat exchange channel 31b, when the heating condition is low temperature, the temperature of the heat exchange medium in the first connecting part 312 is the highest and the temperature of the heat exchange medium in the second connecting part 313 is the lowest. When the cooling condition is high temperature, the temperature of the heat exchange medium in the first connecting part 312 is the lowest and the temperature of the heat exchange medium in the second connecting part 313 is the highest. For the heat exchange area that is in contact with the first connecting part 312 and the second connecting part 313 for heat exchange, the battery cell 210 in this heat exchange area is in contact with both the first connecting part 312 and the second connecting part 313 for heat exchange. At this time, the heat exchange temperature obtained by this heat exchange area is approximately the average temperature of the first connecting part 312 and the second connecting part 313. As a result, the probability of local overheating or local underheating within the battery device 1000 can be reduced, and the temperature uniformity among the battery cells 210 can be improved.

[0187] In the above technical solution, the second heat exchange channel 31b includes a first connecting part 312 and a second connecting part 313. The first connecting part 312 and the second connecting part 313 are respectively connected to the two ends of the channel body 311 of the second heat exchange channel 31b. The ends of the first connecting part 312 and the second connecting part 313 away from the channel body 311 are respectively formed as the inlet 3103 and the outlet 3104 of the second heat exchange channel 31b. Thus, the first connecting part 312 and the second connecting part 313 can reduce the temperature difference between the battery cells 210 that are close to the edge of the housing 100 and are in contact with the first connecting part 312 and the second connecting part 313 for heat exchange and the battery cells 210 that are close to the middle of the housing 100. It can also reduce the probability of local overheating or local underheating in the battery device 1000 and improve the temperature uniformity among the battery cells 210.

[0188] In some embodiments of this application, referring to FIG5, the first connecting portion 312 is closer to the edge of the housing 100 in the second direction Y than the second connecting portion 313.

[0189] In other words, in the second direction Y, the distance between the first connecting part 312 and the edge of the nearest box 100 is less than the distance between the second connecting part 313 and the edge of the nearest box 100.

[0190] Furthermore, the first connecting portion 312 is closer to the edge of the housing 100 in the first direction X than the second connecting portion 313. In other words, in the first direction X, the distance between the first connecting portion 312 and the nearest edge of the housing 100 is less than the distance between the second connecting portion 313 and the nearest edge of the housing 100.

[0191] In some specific examples, the first connecting part 312 and the second connecting part 313 are both arranged on the same side of the housing 100 in the second direction Y. For example, the second direction Y is the left and right direction. The first connecting part 312 and the second connecting part 313 are both arranged on the left side of the housing 100, and the distance between the first connecting part 312 and the left edge of the housing 100 is less than the distance between the second connecting part 313 and the left edge of the housing 100.

[0192] Because the first heat exchange section 3111 is located closer to the edge of the housing 100, it can exchange heat with the battery cells 210 that are also closer to the edge of the housing 100. Furthermore, since one end of the first connecting section 312 forms the inlet 3103 of the second heat exchange channel 31b, the heat exchange medium entering from the inlet 3103 first enters the first connecting section 312, then flows into the channel body 311, and finally into the second heat exchange section 3112. Therefore, under low-temperature heating conditions, the temperature of the heat exchange channel 31 within the first connecting section 312 is higher, and the battery cells 210 exchanging heat with the first connecting section 312 exchange more heat with the environment. Thus, the high-temperature fluid within the first heat exchange section 3111 can compensate for the heat loss from the heat exchange between the battery cells 210 and the environment, thereby improving the temperature uniformity among the battery cells 210.

[0193] In the above technical solution, since the first connecting part 312 is located closer to the edge of the housing 100 in the second direction Y than the second connecting part 313, and one end of the first connecting part 312 is formed as an inlet 3103, the first connecting part 312 can exchange heat with the battery cell 210 which is closer to the edge of the housing 100 than the second connecting part 313. This allows the heat exchange medium entering the first connecting part 312 from the inlet 3103 to compensate for the heat loss of the battery cell 210 which is closer to the edge of the housing 100 and the environment, thereby improving the temperature uniformity among the battery cells 210.

[0194] In some embodiments of this application, referring to FIG5, the first connecting portion 312 and the second connecting portion 313 are arranged on the same side of the first heat exchange channel 31a in the second direction Y.

[0195] For example, the second direction Y is the left-right direction of the battery device 1000. The first connecting part 312 and the second connecting part 313 can both be arranged on the left side of the first heat exchange channel 31a, or they can both be arranged on the right side of the first heat exchange channel 31a. In this case, for the heat exchange area that is in contact with the first connecting part 312 and the second connecting part 313 for heat exchange, the battery cell 210 in this heat exchange area is in contact with both the first connecting part 312 and the second connecting part 313 for heat exchange. At this time, the heat exchange temperature obtained by this heat exchange area is approximately the average temperature of the first connecting part 312 and the second connecting part 313. Therefore, the probability of local overheating or underheating within the battery device 1000 can be reduced, and the temperature uniformity among the battery cells 210 can be improved.

[0196] In the above technical solution, the first connecting part 312 and the second connecting part 313 are arranged on the same side of the first heat exchange channel 31a in the second direction Y, which makes it easier to bend and form the second heat exchange channel 31b, further simplifying the arrangement of multiple heat exchange channels 31, resulting in a compact structure, improving the space utilization rate within the housing 100, reducing the probability of local overheating or underheating within the battery device 1000, and improving the temperature uniformity between battery cells 210.

[0197] In some embodiments of this application, referring to FIG5, the connection position of the first connecting portion 312 and the flow channel body 311 is bent into a quarter-circle arc shape; and / or, the connection position of the second connecting portion 313 and the flow channel body 311 is bent into a quarter-circle arc shape.

[0198] In the above technical solution, the connection points of the first connecting portion 312 and the second connecting portion 313 with the flow channel body 311 are both bent into a quarter-circle shape. This allows for a smooth transition at the connection points, reducing turbulence and eddies, decreasing flow resistance, lowering pressure drop, and improving heat exchange efficiency. It also reduces stress concentration at the connection points, improving structural stability and durability, and extending the service life of the heat exchange assembly 300. Furthermore, it facilitates the processing and forming of the second heat exchange flow channel 31b, reducing the risk of leakage at the connection points of the first connecting portion 312 and the second connecting portion 313 with the flow channel body 311.

[0199] In some embodiments of this application, referring to Figures 5 and 6, the inlets 3103 of the multiple heat exchange channels 31 are all connected, and the outlets 3104 of the multiple heat exchange channels 31 are all connected.

[0200] In other words, multiple heat exchange channels 31 are connected in parallel. When the heat exchange medium in the external pipeline enters the heat exchange component 300, it can be evenly entered into the multiple heat exchange channels 31 through the inlet 3103 of the multiple heat exchange channels 31, so as to achieve uniform distribution of the heat exchange medium and improve the uniformity of heat exchange on the battery cell 210.

[0201] The parallel arrangement of multiple heat exchange channels 31 can reduce the length of a single heat exchange channel 31, reduce flow resistance, reduce pressure drop, and improve heat exchange efficiency. When one heat exchange channel 31 fails, the remaining heat exchange channels 31 can work normally, thereby improving the reliability of the battery device 1000 and reducing the risk of thermal runaway of the battery device 1000.

[0202] In the above technical solution, the inlets 3103 and outlets 3104 of the multiple heat exchange channels 31 are all connected, which can not only achieve uniform distribution of heat exchange medium in the multiple heat exchange channels 31 and improve the temperature uniformity of the battery device 1000, but also reduce flow resistance, improve heat exchange efficiency, and reduce the risk of thermal runaway of the battery device 1000.

[0203] In some embodiments of this application, referring to FIG5, the heat exchange channel 31 includes a horizontal portion 3101 and a vertical portion 3102. The vertical portion 3102 extends along a first direction X, and the horizontal portion 3101 extends along a second direction Y, where the second direction Y is the width direction of the battery device 1000. The vertical portion 3102 is closer to the edge of the housing 100 than the horizontal portion 3101.

[0204] In some examples, the vertical portion 3102 may extend along a straight line parallel to the first direction X, or it may extend along a straight line inclined relative to the first direction X, or it may extend along a curve and / or a broken line extending in the first direction X. The horizontal portion 3101 may extend along a straight line parallel to the second direction Y, or it may extend along a straight line inclined relative to the second direction Y, or it may extend along a curve and / or a broken line extending in the second direction Y.

[0205] In some examples, the number of longitudinal portions 3102 in each heat exchange channel 31 can be one or more, and the multiple longitudinal portions 3102 can be spaced apart in the second direction Y. The number of transverse portions 3101 in each heat exchange channel 31 can be one or more, and the multiple transverse portions 3101 can be spaced apart in the first direction X.

[0206] The longitudinal portion 3102 extends along the length of the housing 100, and the transverse portion 3101 extends along the width of the housing 100. This simplifies the structure of the heat exchange channel 31, facilitates the forming of the heat exchange channel 31, and makes it easier to arrange multiple heat exchange channels 31 in combination within the housing 100.

[0207] In some examples, the length of the vertical portion 3102 may be greater than, less than, or equal to the total length of the plurality of battery cells 210 arranged in the first direction X. Either end of the vertical portion 3102 may extend beyond the plurality of battery cells 210, be flush with the end edge of the plurality of battery cells 210 in the first direction X, or be located between the two ends of the plurality of battery cells 210 in the first direction X. The length of the horizontal portion 3101 in the second direction Y may be greater than, equal to, or less than the total length of the plurality of battery cells 210 arranged in the second direction Y. Either end of the horizontal portion 3101 in the second direction Y may extend beyond or be flush with one side edge of the plurality of battery cells 210 arranged in the second direction Y, or be located between the two side edges of the plurality of battery cells 210 arranged in the second direction Y.

[0208] The edge of the enclosure 100 refers to the location where the enclosure 100 intersects with the external environment space of the enclosure 100, and the edge of the enclosure 100 is closer to the external environment of the enclosure 100 than other parts of the enclosure 100.

[0209] The fact that the longitudinal portion 3102 is closer to the edge of the housing 100 than the transverse portion 3101 indicates that, in the second direction Y, the distance between the longitudinal portion 3102 and the outermost surface of the housing 100 that is closest to it in the second direction Y is less than the distance between the transverse portion 3101 and the outermost surface of the housing 100. In this case, the longitudinal portion 3102 is arranged on the outer periphery of the transverse portion 3101. For example, the longitudinal portion 3102 can be arranged on one side of the transverse portion 3101 in the second direction Y, or the longitudinal portion 3102 can be arranged on both sides of the transverse portion 3101 in the second direction Y.

[0210] In this way, the longitudinal portion 3102 can surround the transverse portion 3101, and the longitudinal portion 3102 can exchange heat with the outer battery cells 210 located closer to the edge of the housing 100 among the multiple battery cells 210.

[0211] It should be noted that during the flow of the heat exchange medium within the heat exchange channel 31, the temperature of the heat exchange medium gradually changes, resulting in a gradual decrease in the heat exchange effect. Specifically, when heating a battery cell, the temperature of the heat exchange medium gradually decreases as it flows; conversely, when cooling a battery cell, the temperature of the heat exchange medium gradually increases as it flows.

[0212] Meanwhile, the outer battery cells 210 near the edge of the housing 100 are closer to the external environment of the housing 100 than the inner battery cells 210. Therefore, the outer battery cells 210 near the edge of the housing 100 have more heat exchange with the external environment than the inner battery cells 210 near the middle of the housing 100, and the heat is dissipated faster.

[0213] When the battery device 1000 is in a high-temperature cooling condition, the heat exchange medium entering from the inlet 3103 of the heat exchange channel 31 can first enter the longitudinal part 3102 of the heat exchange channel 31 and then flow to the transverse part 3101 of the heat exchange channel 31. Alternatively, the heat exchange medium can first enter the transverse part 3101 of the heat exchange channel 31 and then flow to the longitudinal part 3102. When the heat exchange medium first enters the horizontal section 3101 and then flows to the vertical section 3102, it can first cool the internal battery cells 210 located near the middle of the housing 100 in the horizontal section 3101, and then enter the vertical section 3102 to cool the peripheral battery cells 210 located near the edge of the housing 100. Since the peripheral battery cells 210, which are closer to the edge of the housing 100, can dissipate heat directly to the environment through the housing 100, the natural heat dissipation of the peripheral battery cells 210 is better than that of the internal battery cells 210. Therefore, the lower-temperature heat exchange medium in the horizontal section 3101 can better meet the heat dissipation requirements of the battery cells 210 located in the middle of the housing 100. Since the outer battery cells 210 near the edge of the housing 100 can directly dissipate heat naturally towards the external environment, even when the temperature of the heat exchange medium in the longitudinal section 3102 is slightly higher, it can still meet the heat dissipation requirements of the outer battery cells 210. This results in the outer battery cells 210 near the edge of the housing 100 and the battery cells 210 near the middle of the housing 100 receiving roughly the same cooling effect. Consequently, the outer battery cells 210 near the edge of the housing 100 and the battery cells 210 near the middle of the housing 100 have relatively consistent temperatures after cooling, reducing the internal and external temperature differences between the battery cells 210 caused by heat dissipation to the environment, and making the temperature distribution within the battery device 1000 more uniform.

[0214] When the battery device is in a low-temperature heating condition, the heat exchange medium entering from the inlet 3103 of the heat exchange channel 31 can first enter the longitudinal section 3102 of the heat exchange channel 31 and then flow to the transverse section 3101 of the heat exchange channel 31. Alternatively, the heat exchange medium can first enter the transverse section 3101 of the heat exchange channel 31 and then flow to the longitudinal section 3102. For example, when the heat exchange medium flows from the longitudinal section 3102 to the transverse section 3101, the heat exchange medium can first heat the outer battery cells 210 near the edge of the housing 100 in the longitudinal section 3102, and then enter the transverse section 3101 to cool the battery cells 210 near the middle of the housing 100. Since the outer battery cells 210 near the edge of the housing 100 dissipate more heat to the external environment, their temperature drops more easily. The higher-temperature heat exchange medium first heats the outer battery cells 210 near the edge of the housing 100. The higher-temperature heat exchange medium can increase the temperature of the outer battery cells 210 while compensating for the heat lost by the outer battery cells 210 near the edge of the housing 100 due to heat dissipation to the external environment, thus meeting their heating needs. Meanwhile, the battery cells 210 near the center of the housing 100 have less contact area with the external environment, resulting in less heat loss. The slightly lower temperature heat exchange medium flowing in the horizontal section 3101 can effectively meet the heating needs of the battery cells by combining with the heat generated by the battery cells themselves. As a result, the heating effect of the outer battery cells 210 near the edge of the housing 100 and the battery cells 210 near the center of the housing 100 is basically the same. This makes the temperature of the outer battery cells 210 near the edge of the housing 100 and the battery cells 210 near the center of the housing 100 more consistent after heating, reducing the temperature difference between the inside and outside of the battery cells 210 caused by heat dissipation to the environment, and making the temperature distribution inside the battery device 1000 more uniform.

[0215] In addition, the longitudinal portion 3102 can conduct heat in the length direction of the battery device 1000, and the transverse portion 3101 can conduct heat in the width direction of the battery device 1000. As a result, the temperature difference between the length and width directions of the battery device 1000 can be further reduced, and the temperature uniformity of the battery device 1000 can be further improved.

[0216] In the above technical solution, since the vertical portion 3102 is closer to the edge of the housing 100 than the horizontal portion 3101, the vertical portion 3102 can exchange heat with the outer battery cells 210 near the edge of the housing 100 among the multiple battery cells 210, and the horizontal portion 3101 can exchange heat with the battery cells 210 near the middle of the housing 100. When the heat exchange medium flows into the vertical portion 3102 and the horizontal portion 3101 in sequence, it can compensate for the temperature difference between the outer battery cells 210 near the edge of the housing 100 and the battery cells 210 near the middle of the housing 100 caused by heat exchange with the environment, so that the heat exchange effect of the outer battery cells 210 near the edge of the housing 100 and the battery cells 210 near the middle of the housing 100 tends to be consistent, thereby improving the temperature uniformity of the battery device 1000 and thus improving the service life of the battery device 1000 to a certain extent. In addition, the heat exchange channel 31 includes a longitudinal portion 3102 extending along the first direction X and a transverse portion 3101 extending along the second direction Y, which can simplify the structure of the heat exchange channel 31 and facilitate the processing and arrangement of the heat exchange channel 31.

[0217] In some embodiments of this application, referring to FIG5, a plurality of transverse portions 3101 in the flow channel body 311 are spaced apart and connected sequentially in the first direction X, and the longitudinal portion 3102 in the flow channel body 311 is connected to at least a portion of the transverse portions 3101.

[0218] In other words, the flow channel body 311 may include at least one vertical portion 3102 and multiple horizontal portions 3101. The flow channel body 311 may include two, three, four, five, six, eight or more horizontal portions 3101. Multiple horizontal portions 3101 can increase the heat exchange area between the flow channel body 311 and multiple battery cells 210, thereby improving the heat exchange efficiency with the battery cells 210.

[0219] The longitudinal portion 3102 may be connected to a portion of the plurality of transverse portions 3101, or the longitudinal portion 3102 may be connected to each of the transverse portions 3101. For example, the flow channel body 311 may include only one longitudinal portion 3102 and a plurality of transverse portions 3101, with the plurality of transverse portions 3101 connected sequentially, and one end of the longitudinal portion 3102 connected to one of the transverse portions 3101 at the far end in the first direction X. Alternatively, the flow channel body 311 may include one longitudinal portion 3102 and a plurality of transverse portions 3101, with the longitudinal portion 3102 connected to one end of each transverse portion 3101 in the second direction Y, and the plurality of transverse portions 3101 connected through the longitudinal portion 3102.

[0220] In the above technical solution, since multiple horizontal portions 3101 of the flow channel body 311 are connected in sequence, and the vertical portion 3102 connects some or all of the horizontal portions 3101, the multiple horizontal portions 3101 can increase the arrangement density of the flow channel body 311 in the length direction of the battery device 1000, improve the heat exchange efficiency and heat exchange uniformity with the battery cell 210, and the vertical portion 3102 is arranged closer to the edge and connected to the horizontal portions 3101. The vertical portion 3102 can exchange heat with the outer battery cell 210 near the edge of the housing 100, increase the heat exchange area with the outer battery cell 210, and improve the temperature uniformity of the battery device 1000.

[0221] In some embodiments of this application, referring to FIG5, the flow channel body 311 includes: a first heat exchange portion 3111 and a second heat exchange portion 3112. The first heat exchange portion 3111 is bent and extends to define a U-shaped region, and the second heat exchange portion 3112 is bent and arranged in the U-shaped region. The second heat exchange portion 3112 is bent and connected to one end of the first heat exchange portion 3111.

[0222] The first heat exchange section 3111 is bent and extended into a U-shape, which can extend the length of the first heat exchange section 3111, increase the heat exchange time and heat exchange area between the heat exchange medium and the battery cell 210 in the first heat exchange section 3111, and improve the heat exchange effect.

[0223] The second heat exchange section 3112 is bent and extended, and is arranged inside the first heat exchange section 3111. For example, the second heat exchange section 3112 can be bent and extended in a U-shape, S-shape, or U-shape inside the first heat exchange section 3111. The bent arrangement of the second heat exchange section 3112 can increase the extension length of the second heat exchange section 3112, increase the heat exchange time between the heat exchange medium and the battery cell 210 inside the second heat exchange section 3112, and improve the heat exchange effect.

[0224] The first heat exchange section 3111 and the second heat exchange section 3112 are connected by bending. For example, the first heat exchange section 3111 and the second heat exchange section 3112 can be connected by a bent flow channel section, which can be bent along an arc and / or a zigzag line. As a result, the structure of the flow channel body 311 can be compacted, the arrangement density of the flow channels in the flow channel body 311 can be increased, and the uniformity of heat exchange for multiple battery cells 210 can be improved.

[0225] In some specific examples, the first heat exchange section 3111 and the second heat exchange section 3112 are bent in the same plane, which simplifies the structure of the flow channel body 311, reduces the processing difficulty of the flow channel body 311, and reduces the space occupied by the flow channel body 311.

[0226] The first heat exchange section 3111 is connected to the upstream or downstream side of the second heat exchange section 3112 in the direction of heat exchange medium flow. For example, when the heat exchange medium flows into the flow channel body 311, the heat exchange medium can first flow into the first heat exchange section 3111 and then into the second heat exchange section 3112, or the heat exchange medium can first flow into the second heat exchange section 3112 and then into the first heat exchange section 3111.

[0227] Specifically, when the heat exchange assembly 300 cools the battery cell 210, the heat exchange medium in the flow channel body 311 can flow from the second heat exchange section 3112 to the first heat exchange section 3111. At this time, the lower-temperature heat exchange medium first cools the battery cell 210 in the middle of the heat exchange area corresponding to the flow channel body 311, and then cools the battery cells 210 at the periphery of the heat exchange area corresponding to the flow channel body 311. Since the battery cells 210 at the periphery of the heat exchange area are closer to the edge of the housing 100 than the battery cells 210 in the middle of the heat exchange area, they naturally dissipate more heat from the external environment of the housing 100. The lower-temperature heat exchange medium in the second heat exchange section 3112 can... To better meet the heat dissipation needs of the battery cells 210 in the middle of the heat exchange area corresponding to the main body of the flow channel 311, and since the battery cells 210 at the periphery of the heat exchange area can dissipate more heat to the environment naturally than the battery cells 210 in the middle, the heat exchange medium temperature in the first heat exchange section 3111 is slightly higher, but it can still meet the heat dissipation needs of the battery cells 210 at the periphery of the heat exchange area corresponding to the main body of the flow channel 311. As a result, the cooling effect and temperature of the battery cells 210 at the periphery and the middle of the heat exchange area corresponding to the main body of the flow channel 311 are roughly the same, thus improving the temperature uniformity among the battery cells 210 in the heat exchange area corresponding to the main body of the flow channel 311.

[0228] When the heat exchange assembly 300 heats the battery cell 210, the heat exchange medium in the flow channel body 311 can flow from the first heat exchange section 3111 to the second heat exchange section 3112. At this time, the heat exchange medium with a higher temperature first flows into the first heat exchange section 3111 to heat the battery cell 210 at the periphery of the heat exchange area corresponding to the flow channel body 311. Then, the heat exchange medium with a slightly lower temperature flows into the second heat exchange section 3112 to heat the battery cell 210 at the middle of the heat exchange area corresponding to the flow channel body 311. In this case, since the battery cells 210 at the periphery of the heat exchange area corresponding to the flow channel body 311 are closer to the edge of the box 100 than the battery cells 2101 at the center of the heat exchange area, they are more likely to lose heat and their temperature drops faster. The heat exchange medium with a higher temperature in the first heat exchange section 3111 can not only raise the temperature of the battery cells 210 at the periphery of the heat exchange area corresponding to the flow channel body 311, but also make up for the heat lost by the battery cells 210 at the periphery of the heat exchange area due to environmental heat dissipation, thus meeting their heating requirements. Meanwhile, the battery cell 210 in the middle of the heat exchange area corresponding to the main flow channel 311 dissipates less heat to the external environment of the housing 100. The heat exchange medium in the second heat exchange section 3112, which has a slightly lower temperature, can also well meet the heating requirements of the battery cell 210 in the middle of the heat exchange area corresponding to the main flow channel 311. This results in the battery cells 210 at the periphery and the middle of the heat exchange area corresponding to the main flow channel 311 receiving roughly the same heating effect and the temperature tending to be consistent, thereby improving the temperature uniformity among the battery cells 210 in the heat exchange area corresponding to the main flow channel 311.

[0229] In the above technical solution, since the first heat exchange part 3111 of the flow channel body 311 is bent and extended into a U-shape, and the second heat exchange part 3112 is bent and arranged inside the first heat exchange part 3111, and the first heat exchange part 3111 and the second heat exchange part 3112 are bent and connected, the structure of the flow channel body 311 can be compacted, the flow channel length of the flow channel body 311 and the heat exchange area with the battery cell 210 can be increased, the flow time of the heat exchange medium in the flow channel body 311 can be extended, the heat exchange efficiency can be improved, and the temperature uniformity among the battery cells 210 in the area where the flow channel body 311 is located can be improved.

[0230] In some embodiments of this application, referring to FIG5, the second heat exchange section 3112 includes a plurality of horizontal sections 3101. The plurality of horizontal sections 3101 extend along the second direction Y and are spaced apart in the first direction X. The second direction Y is the width direction of the battery device 1000. The plurality of horizontal sections 3101 of the second heat exchange section 3112 are sequentially bent and connected along the first direction X.

[0231] The second heat exchange section 3112 may include two, three, four, five or more horizontal sections 3101.

[0232] In some examples, two connected horizontal sections 3101 can be connected by bending along a broken line or along an arc. Furthermore, two adjacent horizontal sections 3101 can be bent into a U-shape or a V-shape.

[0233] In the above technical solution, the second heat exchange section 3112 includes multiple horizontal sections 3101. The multiple horizontal sections 3101 can increase the heat exchange area of ​​the second heat exchange section 3112, improve the heat exchange efficiency, make the heat of the second heat exchange section 3112 evenly distributed, and improve the temperature uniformity between battery cells 210. In addition, the multiple horizontal sections 3101 are bent and connected in sequence, which can simplify the structure of the second heat exchange section 3112 and facilitate the processing and forming of the second heat exchange section 3112.

[0234] In some embodiments of this application, referring to FIG5, the connection position of two adjacent horizontal portions 3101 of the second heat exchange portion 3112 is bent into a semi-circular arc shape.

[0235] For example, the second heat exchange section 3112 includes a plurality of horizontal sections 3101, which extend along the second direction Y and are arranged parallel and spaced apart in the first direction X. The spacing between two adjacent horizontal sections 3101 can be set according to the heat exchange requirements of the battery cell 210. The plurality of horizontal sections 3101 are sequentially bent and connected, and the bending position is a semi-circular arc shape that is away from the protrusion of the horizontal section 3101 in the second direction Y.

[0236] The connection point of the two horizontal sections 3101 is bent into a semi-circular arc shape, which can not only further reduce the flow resistance of the heat exchange medium at the bending point, reduce pressure drop, and improve heat exchange performance, but also reduce stress concentration at the bending point, thereby improving the reliability and service life of the heat exchange component 300.

[0237] In the above technical solution, the connection position of the two horizontal parts 3101 of the second heat exchange section 3112 is bent into a semi-circular arc shape. This not only allows the two horizontal parts 3101 to be arranged in parallel and spaced apart, making the structure of the second heat exchange section 3112 compact and improving the heat exchange efficiency, but also reduces the flow resistance of the heat exchange medium, reduces the pressure drop, further improves the heat exchange efficiency of the second heat exchange section 3112, and reduces stress concentration at the bending position, thus extending the service life of the heat exchange component 300.

[0238] In some embodiments of this application, referring to FIG5, the first heat exchange section 3111 includes: two horizontal sections 3101 and one vertical section 3102. The two horizontal sections 3101 extend along the second direction Y and are spaced apart in the first direction X. The second direction Y is the width direction of the battery device 1000. The vertical section 3102 extends along the first direction X and is connected between the two horizontal sections 3101.

[0239] For example, the two horizontal portions 3101 of the first heat exchange section 3111 extend along the second direction Y and are arranged parallel and spaced apart in the first direction X. The vertical portion 3102 is arranged perpendicular to the two horizontal portions 3101, and the two ends of the vertical portion 3102 in the first direction X are respectively connected to the ends of one end of the two horizontal portions 3101 in the second direction Y, so as to form a U-shaped first heat exchange section 3111.

[0240] In the above technical solution, since the first heat exchange part 3111 includes two horizontal parts 3101 and a vertical part 3102 connected between the two horizontal parts 3101, it is convenient to surround the second heat exchange part 3112 inside, simplifying the structure of the first heat exchange part 3111, and making it easier to process and shape the first heat exchange part 3111 to improve production efficiency.

[0241] In some embodiments of this application, referring to FIG5, the connection positions of the two horizontal portions 3101 and the vertical portion 3102 of the first heat exchange portion 3111 are all bent into a quarter-circle arc shape.

[0242] Specifically, one end of one of the horizontal portions 3101 of the first heat exchange section 3111 is connected to one end of the vertical portion 3102, and the connection position is bent into a quarter-circle arc shape. One end of the other horizontal portion 3101 of the first heat exchange section 3111 is connected to the other end of the vertical portion 3102, and the connection position is also bent into a quarter-circle arc shape.

[0243] In the above technical solution, the connection between the horizontal portion 3101 and the vertical portion 3102 of the first heat exchange section 3111 is bent into a quarter-circle shape. This allows for a smooth transition at the connection point, reducing turbulence and eddies, decreasing flow resistance, lowering pressure drop, and improving heat exchange efficiency. It also reduces stress concentration at the connection point, improving structural stability and durability, and extending the service life of the heat exchange assembly 300. Furthermore, it facilitates the processing and forming of the first heat exchange section 3111, reducing the risk of leakage at the connection point.

[0244] In some embodiments of this application, referring to FIG5, the first heat exchange part 3111 and the second heat exchange part 3112 are bent and connected.

[0245] Specifically, the other end of one of the horizontal portions 3101 of the first heat exchange section 3111 is bent and connected to the closest horizontal portion 3101 among the plurality of horizontal portions 3101 of the second heat exchange section 3112.

[0246] In the above technical solution, since the first heat exchange part 3111 and the second heat exchange part 3112 are bent and connected, the second heat exchange part 3112 can be easily bent and set inside the first heat exchange part 3111, so that the first heat exchange part 3111 can cover the second heat exchange part 3112 inside, thus compacting the structure of the heat exchange channel 31, improving the uniformity of the distribution of the heat exchange channel 31 on the surface of multiple battery cells 210, and improving the temperature uniformity performance of the battery device 1000.

[0247] In some embodiments of this application, referring to FIG5, the connection position between the first heat exchange part 3111 and the second heat exchange part 3112 is bent into a semi-circular arc shape.

[0248] For example, the first heat exchange section 3111 and the second heat exchange section 3112 are connected by a semi-circular bend, wherein the bend extends along the second direction Y toward a semi-circular arc protruding away from the first heat exchange section 3111 and the second heat exchange section 3112.

[0249] In the above technical solution, since the connection between the first heat exchanger 3111 and the second heat exchanger 3112 is bent into a semi-circular arc, the connection between the first heat exchanger 3111 and the second heat exchanger 3112 can be smoothly transitioned, reducing turbulence and eddies, reducing flow resistance, lowering pressure drop, and improving heat exchange efficiency. It can also reduce stress concentration at the connection between the first heat exchanger 3111 and the second heat exchanger 3112, improving the structural stability and durability of the connection, and extending the service life of the heat exchange assembly 300. Furthermore, it facilitates the processing and forming of the flow channel body 311, reducing the risk of leakage at the connection between the first heat exchanger 3111 and the second heat exchanger 3112.

[0250] In some embodiments of this application, referring to FIG5, each heat exchange channel 31 has an inlet 3103 and an outlet 3104, and each heat exchange channel 31 extends from the inlet 3103 to the outlet 3104, wherein the ratio of the extension lengths of any two heat exchange channels 31 is 0.8-1.2.

[0251] The extension length of the heat exchange channel 31 refers to the total path length of the heat exchange medium from the inlet 3103 to the outlet 3104 of the heat exchange channel 31 along the flow direction of the heat exchange medium.

[0252] For example, the ratio of the extension lengths of any two heat exchange channels 31 can be 0.8, 0.85, 0.9, 0.95, 1.0, 1.05, 1.1, 1.15 or 1.2.

[0253] In the above technical solution, setting the ratio of the extension lengths of any two heat exchange channels 31 to 0.8-1.2 can make the extension lengths of any two heat exchange channels 31 relatively close, so that the flow distance of the heat exchange medium in each heat exchange channel 31 is relatively uniform, and the flow resistance in each heat exchange channel 31 is similar, thereby making the heat exchange efficiency of each heat exchange channel 31 uniform, and thus improving the temperature uniformity among the battery cells 210 corresponding to each heat exchange channel 31.

[0254] In some embodiments of this application, referring to FIG5, the heat exchange assembly 300 includes a plurality of heat exchange tubes 30, each heat exchange tube 30 being bent and extended to define a heat exchange channel 31.

[0255] The heat exchange tube 30 is a tubular element used to achieve heat exchange. The heat exchange medium can flow inside the heat exchange tube 30 and transfer the heat of the heat exchange medium to the object that needs to be heated or cooled (such as the battery cell 210) through the tube wall of the heat exchange tube 30.

[0256] In some examples, each heat exchange tube 30 is formed by bending a single tube, which reduces the number of weld points on the heat exchange tube 30 and the risk of leakage in the heat exchange assembly 300. At the same time, the process of bending a single tube is simpler than the process of manufacturing a plate structure, and the heat exchange tube requires less material than a cold plate, which can significantly reduce the cost of the heat exchange assembly 300.

[0257] Compared to related technologies that use cold plates with flow channels, where the flow channels are narrow, flow velocity is limited, and flow is uneven, this application uses a heat exchange tube 30 that is bent and extended to define a heat exchange flow channel 31. The heat exchange medium in the heat exchange tube 30 can achieve a higher flow velocity, increasing the turbulence of the heat exchange medium and thus improving the heat exchange efficiency of the battery cell 210. At the same time, the flow velocity of the heat exchange medium in the heat exchange tube 30 is more uniform, which is conducive to the uniform transfer of heat exchange medium temperature and thus improves the temperature uniformity among the battery cells 210.

[0258] In addition, the bent and extended heat exchange tube 30 of this application can be set with bending position and arrangement density according to the heat exchange requirements of the battery cells 210 at various locations within the battery device 1000, thereby effectively reducing the probability of local overheating and underheating within the battery device 1000 and improving the temperature uniformity among the battery cells 210.

[0259] The shape of the heat exchange tube 30 can be varied, such as a circular tube or a flat tube.

[0260] For example, the number of heat exchange tubes 30 can be one, two, three or more, and the number of heat exchange tubes 30 can be designed according to the number and size of the battery cells 210.

[0261] In the above technical solution, since the heat exchange component 300 includes multiple heat exchange tubes 30, each of which is bent and extended to define a heat exchange channel 31, it can not only reduce the complexity of the heat exchange channel 31 forming process, thereby increasing the production rate of the heat exchange component 300, but also reduce the fluid pressure drop within a single heat exchange tube 30, improving heat exchange efficiency, and achieving uniform temperature transfer of the heat exchange medium, thus improving the temperature uniformity between battery cells 210. Furthermore, the tubular structure is simpler than the plate structure, requires less material, has lower cost, and is easier to process.

[0262] In some embodiments of this application, the heat exchange tube 30 is provided with partition ribs (not shown in the figure), which extend along the extension direction of the heat exchange tube 30 and divide the heat exchange channel 31 into multiple sub-channels arranged in parallel.

[0263] For example, the heat exchange tube 30 can be a flat tube or a harmonica tube. Both flat tubes and harmonica tubes can have internal partition ribs that extend along their length. Each heat exchange tube 30 can have one partition rib or multiple partition ribs spaced apart along its width. One or more partition ribs can divide the heat exchange channel 31 within the flat tube or harmonica tube into multiple sub-channels. This increases the contact area between the heat exchange medium and the tube wall of the heat exchange tube 30, thereby improving heat exchange efficiency.

[0264] In some examples, to improve the heat exchange efficiency between the heat exchange tube 30 and the battery cell assembly 200 and increase the heat exchange contact area between the heat exchange tube 30 and the battery cell 210, the arrangement density of the heat exchange tube 30 is usually increased. Therefore, when the heat exchange tube 30 is bent, a smaller bending radius is usually used at the bending position to increase the arrangement density of the heat exchange tube 30. However, when the bending radius of the heat exchange tube 30 is small, the deformation elongation of the heat exchange tube 30 at the bending position is large, which affects the structural strength and sealing performance of the heat exchange tube 30. Therefore, in some examples, the heat exchange tube 30 is provided with partition ribs. The partition ribs extend along the extension direction of the heat exchange tube 30 and are arranged inside the heat exchange tube 30. In the cross-section of the heat exchange tube 30, the two ends of the partition ribs are respectively connected to the inner walls of opposite sides of the heat exchange tube 30. For example, the partition ribs can be connected to the inner walls of opposite sides of the heat exchange tube 30 in the thickness direction. In this way, the partition ribs can play a role in supporting the inner wall of the heat exchange tube 30, improving the structural strength of the heat exchange tube 30, and improving the deformation resistance of the heat exchange tube 30. At the same time, at the bending position of the heat exchange tube 30, the partition ribs can strengthen the structural strength of the bending position of the heat exchange tube 30, reduce the risk of local strength deficiency caused by bending, and improve the service life of the heat exchange tube 30.

[0265] In the above technical solution, since the heat exchange tube 30 is provided with partition ribs, the partition ribs can not only increase the heat exchange area between the heat exchange medium and the heat exchange tube 30 and improve the heat exchange efficiency, but also improve the structural strength of the heat exchange tube 30, improve the reliability and stability of the heat exchange assembly 300, and strengthen the structural strength of the bending position of the heat exchange tube 30, reduce the risk of local strength deficiency caused by bending of the heat exchange tube 30, and improve the service life of the heat exchange tube 30.

[0266] In some embodiments of this application, referring to Figures 3-5, the battery cell assembly 200 includes multiple rows of battery cells 210. The multiple battery cells 210 are stacked in a row along the second direction Y. The multiple rows of battery cells 210 are arranged in the battery cell assembly 200 along the first direction X. The heat exchange assembly 300 is arranged on at least one side of the battery cell assembly 200 in the third direction Z. The second direction Y is the width direction of the battery device 1000. The first direction X, the second direction Y and the third direction Z are arranged at an angle to each other.

[0267] For example, as shown in Figures 3-4, the battery device 1000 includes multiple battery cell assemblies 200. Each battery cell assembly 200 includes one or more rows of battery cells 210. In this embodiment, the battery device 1000 includes three battery cell assemblies 200. The three battery cell assemblies 200 are arranged sequentially along a first direction X. Each battery cell assembly 200 includes two rows of battery cells 210 arranged side by side in the first direction X. Multiple battery cells 210 in each row of battery cells 210 are stacked in a second direction Y. The second direction Y is the thickness direction of the battery cell 210 and is also the left-right direction. The first direction X is the length direction of the battery cell 210 and is also the front-back direction.

[0268] Since the first direction X is the length direction of the housing 100 and the second direction Y is the width direction of the housing 100, when multiple battery cells 210 of the battery cell assembly 200 are stacked in a row along the second direction Y, the stacking direction of the multiple battery cells 210 in the thickness direction is along the width direction of the housing 100. This application, by arranging multiple battery cells 210 in the battery cell assembly 200 along the width direction of the housing 100, allows for the design and adjustment of the number of battery cells 210 in the width direction of the battery cell assembly 200 according to the dimensions of the housing 100, thereby improving the space utilization rate within the housing 100.

[0269] It should be noted that when the battery cell assembly 200 is arranged inside the housing 100, and the arrangement method in the related technology in which the thickness direction of the battery cell 210 is parallel to the length direction of the housing 100 and the length direction of the battery cell 210 is parallel to the width direction of the housing 100, the total number of battery cells 210 that can be arranged sequentially in the width direction of the housing 100 is: the quotient obtained by dividing the width dimension of the housing 100 by the length dimension of the battery cell 200 and then rounding down.

[0270] When the battery cell assembly 200 is arranged inside the housing 100, and the thickness direction of the battery cell 210 of this application is parallel to the width direction of the housing 100, and the length direction of the battery cell 210 is parallel to the length direction of the housing 100, the total number of battery cells 210 that can be arranged sequentially in the width direction of the housing 100 is: the quotient obtained by dividing the width dimension of the housing 100 by the thickness dimension of the battery cell 210 and then rounding down.

[0271] Since the thickness of the battery cell 210 is much smaller than its length, when the outer contour and width of the housing 100 are determined, the battery cell assembly 200 arrangement scheme of this application is adopted, in which the thickness direction of the battery cell 210 is parallel to the width direction of the housing 100, and the battery cells 210 are stacked in the width direction of the housing 100. This allows for more flexible adaptation to the width of the housing 100, making full use of the space in the width direction of the housing 100 and improving the energy density of the battery device 1000.

[0272] Furthermore, the heat exchange component 300 is arranged on one side of the battery cell assembly 200 in the third direction Z, or the heat exchange component 300 is arranged on both sides of the battery cell assembly 200 in the third direction Z. For example, the third direction Z is the vertical direction, and the heat exchange component 300 can be arranged on the upper or lower side of the battery cell assembly 200, or the heat exchange component 300 can be arranged on both the upper and lower sides of the battery cell assembly 200.

[0273] By exchanging heat between the heat exchange component 300 and multiple battery cells 210 of the battery cell assembly 200, the multiple battery cells 210 can operate within a suitable temperature range, thereby improving the reliability, stability and service life of the battery device 1000.

[0274] The heat exchange assembly 300 has a plurality of heat exchange tubes 30, each heat exchange tube 30 is bent and extended and defines a heat exchange flow channel 31 on the inner side, each heat exchange flow channel 31 has a flow channel body 311, and the flow channel bodies 311 of the plurality of heat exchange flow channels 31 are arranged sequentially along the first direction X.

[0275] Since multiple rows of battery cells 210 in the battery cell assembly 200 are arranged sequentially along the first direction, and multiple flow channel bodies 311 are arranged sequentially along the first direction, each flow channel body 311 can exchange heat with one or more adjacent battery cell assemblies, or each flow channel body 311 can exchange heat with one or more adjacent rows of battery cells 210. For example, the flow channel body 311 of the first heat exchange flow channel 31a exchanges heat with two battery cell assemblies 200, and the flow channel body 311 of the second heat exchange flow channel 31b exchanges heat with one battery cell assembly 200. This improves the temperature uniformity among the battery cell assemblies 200.

[0276] Therefore, by controlling the temperature of the corresponding heat exchange channel 31, the temperature of the heat exchange medium in each channel body 311 can be controlled, thereby enabling independent and precise control of the temperature of each battery cell assembly 200 or each row of battery cells 210. This can further reduce the temperature difference between different battery cell assemblies 200 or between different rows of battery cells 210, and improve the temperature uniformity between battery cell assemblies 200 or between multiple rows of battery cells 210.

[0277] Furthermore, since multiple flow channel bodies 311 are arranged sequentially along the length of the housing 100, and each row of battery cells 210 of the battery cell assembly 200 is stacked along the width of the housing 100, each flow channel body 311 can be configured to extend back and forth in the width of the housing 100 during bending and extension. In this way, the flow channel body 311 can contact and exchange heat with each battery cell 210 in the corresponding heat exchange area during the back and forth extension, reducing the risk of local overheating or underheating due to the battery cells 210 not contacting the flow channel body 311 in the corresponding heat exchange area, thereby improving the temperature uniformity among the battery cells 210.

[0278] In some examples, each heat exchange channel 31 includes multiple transverse sections 3101 extending along the width direction of the housing 100 and spaced apart along the length direction of the housing 100. Further, the channel body 311 extends reciprocally along the width direction of the housing 100 and includes multiple sequentially connected transverse sections 3101, wherein each row of battery cells 210 exchanges heat with at least two transverse sections 3101. Thus, the heat exchange temperature between each row of battery cells 210 and the heat exchange channel 31 is equivalent to the average temperature of the multiple transverse sections 3101. This reduces the risk of localized overheating or underheating within the battery device 1000, improving the temperature uniformity performance of the battery device 1000. For example, each row of battery cells 210 may exchange heat with two, three, four, or more transverse sections 3101.

[0279] In the above technical solution, by making the battery cell assembly 200 include multiple rows of battery cells 210, with multiple battery cells 210 stacked in a row along the second direction Y, and multiple rows of battery cells 210 arranged in the first direction X to form the battery cell assembly 200, the width dimension of the housing 100 (i.e., the dimension of the housing in the second direction) can be adapted more flexibly, making full use of the space in the width direction of the housing 100 and increasing the energy density of the battery device 1000. Simultaneously, by placing the heat exchange component 300 on one side of the battery cell assembly 200 in the third direction and arranging multiple flow channel bodies along the first direction, the energy density of the battery device 1000 can be increased. By controlling the temperature of the heat exchange medium within each flow channel body 311, independent and precise temperature control of each battery cell assembly 200 or each row of battery cells 210 can be achieved, improving the temperature uniformity among battery cell assemblies 200. It also allows the flow channel body 311 to be arranged to extend back and forth along the width direction of the housing 100, so that the flow channel body 311 contacts and exchanges heat with each battery cell 210 in the corresponding heat exchange area, reducing the risk of local overheating or underheating due to battery cells 210 not contacting the flow channel body 311 in the corresponding heat exchange area, thereby improving the temperature uniformity among battery cells 210.

[0280] In some embodiments of this application, as shown in FIG6, the width of the heat exchange channel 31 is a first width H1, and the dimension of the battery cell 210 in the first direction X is a second width H2, and the ratio of the first width H1 to the second width H2 is greater than or equal to one-third.

[0281] In some examples, a heat exchange channel 31 is defined within the heat exchange tube 30, the width of which is the width of the heat exchange tube 30 or the length of the cross-section of the heat exchange tube 30.

[0282] For example, the ratio of the first width of the heat exchange channel 31 to the second width of the battery cell 210 is 0.35, 0.4, 0.45, 0.5, 0.55, 0.6 and above, etc.

[0283] In some examples, when the battery cell 210 exchanges heat with multiple transverse portions 3101 of the heat exchange channel 31, the sum of the widths of the multiple transverse portions 3101 exchanging heat with each battery cell 210 in the first direction X is a first heat exchange width, and the ratio of the first heat exchange width to the second width of the battery cell 210 is greater than or equal to one-third. This can increase the heating rate of the battery cell 210 by the heat exchange assembly 300, thereby increasing the temperature rise rate of the battery cell 210.

[0284] In the above technical solution, since the ratio of the first width of the heat exchange channel 31 to the second width of the battery cell 210 is greater than or equal to one-third, it can not only increase the width of the heat exchange channel 31, increase the flow cross-sectional area of ​​the heat exchange channel 31, reduce the pressure drop of the heat exchange channel 31, and improve the heat exchange efficiency, but also increase the heat exchange area between the heat exchange channel 31 and the battery cell 210, increase the heating rate of the heat exchange component 300 on the battery cell 210, and increase the temperature rise rate of the battery cell 210.

[0285] In some embodiments of this application, referring to Figures 5 and 6, the heat exchange assembly 300 includes a plurality of heat exchange tubes 30, each heat exchange tube 30 defining a heat exchange flow channel 31, and the battery cell 210 has a first wall surface that cooperates with the heat exchange tubes 30 for heat exchange. With the first wall surface as the projection surface, the area of ​​the orthographic projection of the heat exchange tube 30 on the first wall surface is greater than or equal to one-third of the area of ​​the first wall surface.

[0286] The first wall surface that mates with the battery cell 210 and the heat exchange tube 30 is the surface of the battery cell 210 on the Z-direction side. Specifically, the first wall surface is the outer surface of the battery cell 210 shell on the Z-direction side. When the heat exchange tube 30 heats or cools the battery cell 210, heat is transferred from the battery cell 210 to the heat exchange medium inside the heat exchange tube 30 through the first wall surface, or from the heat exchange medium inside the heat exchange tube 30 to the battery cell 210.

[0287] The orthographic projection of the heat exchange tube 30 on the first wall surface refers to the projection of the heat exchange tube 30 onto the first wall surface in a direction parallel to the third direction Z. When the heat exchange tube 30 is a flat tube, the orthographic projection of the heat exchange tube 30 on the first wall surface is the contact area between the heat exchange tube 30 and the battery cell 210.

[0288] It is understandable that when the battery cell 210 is cooling down or heating up, if the temperature of the heat exchange medium remains constant, the larger the heat exchange area between the battery cell 210 and the heat exchange tube 30, the faster the cooling or heating rate of the battery cell 210 will be.

[0289] In the above technical solution, since the heat exchange contact area between the heat exchange tube 30 and the battery cell 210 is greater than or equal to one-third of the area of ​​the first wall surface, when the heat exchange tube 30 cools or heats the battery cell 210, the heat exchange contact area between the heat exchange tube 30 and each battery cell 210 can be increased, thereby improving the heat exchange rate of the battery cell 210. In this way, not only can the battery cell 210 quickly reach the preset temperature range when the battery device 1000 starts working, but also during the normal operation of the battery device 1000, the battery cell 210 can be kept within a suitable temperature range, reducing the temperature fluctuation of the battery cell 210 during operation, thereby making the operation of the battery cell 210 more stable and enabling the battery device 1000 to maintain good performance.

[0290] In some embodiments of this application, referring to FIG7, the housing 100 includes: a bottom plate 110 and a top cover 120. The top cover 120 covers the upper side of the bottom plate 110 and cooperates with the bottom plate 110 to define a receiving cavity, and the battery cell 210 is disposed in the receiving cavity.

[0291] In some examples, the base plate 110 and the top cover 120 are detachably connected. For example, the periphery of the base plate 110 is formed with a plurality of first fixing holes arranged at intervals, and the periphery of the top cover 120 is formed with a plurality of second fixing holes arranged at intervals. The base plate 110 and the top cover 120 are fixedly connected by fasteners passing through the first fixing holes and the second fixing holes.

[0292] In some examples, the periphery of the base plate 110 is provided with a first flange extending horizontally, and a first fixing hole passes through the first flange in the vertical direction. The periphery of the top cover 120 is formed with a second flange, and a second fixing hole passes through the second flange in the vertical direction.

[0293] In some examples, a seal 140 is provided between the base plate 110 and the top cover 120. The seal 140 extends circumferentially along the base plate 110 and the top cover 120 and seals against the first flange of the base plate 110 and the second flange of the top cover 120. The seal 140 is used to seal the gap between the base plate 110 and the top cover 120. The seal 140 can be a gasket, and it can extend annularly along the circumferential direction of the base plate 110 and the top cover 120. The seal 140 can also include multiple sealing segments, which are arranged sequentially or spaced apart along the circumferential direction of the base plate 110 and the top cover 120.

[0294] In some examples, the base plate 110 has a mounting plate 113 extending toward the top cover 120 along one edge in the first direction X. The edge of the top cover 120 has a clearance opening adapted to the shape of the mounting plate 113, and the mounting plate 113 fits into the clearance opening. The mounting plate 113 may have mounting portions, one or more of which can be used to fix and mount pipe fittings (e.g., inlet and outlet fittings described below). These fittings connect the inlet and outlet of the heat exchange assembly 300 to external pipelines. Additionally, the mounting portions can also be used to mount connection terminals, which can be used to electrically connect the battery cell assembly 200 to an external circuit, or to electrically connect electrical components inside the housing 100 to external electrical components.

[0295] In the above technical solution, since the housing 100 includes an upper cover 120 and a bottom plate 110, the upper cover 120 and the bottom plate 110 cooperate to define an accommodating cavity. The upper cover 120 and the bottom plate 110 can encapsulate and protect the battery cell 210. In addition, splitting the housing 100 into an upper cover 120 and a bottom plate 110 can simplify the structure of the housing 100, facilitate the processing and forming of the housing 100, and facilitate the installation of internal components of the battery device 1000.

[0296] In some embodiments of this application, referring to FIG7, the housing 100 further includes: mounting beams 130, the end plate mounting beams 130 being disposed within the receiving cavity, the mounting beams 130 extending along the first direction X and arranged on both sides of the bottom plate 110 in the second direction Y, and the battery cell assembly 200 being disposed between the two mounting beams 130.

[0297] The battery cell assembly 200 includes multiple rows of battery cells 210. The multiple battery cells 210 in each row are stacked along the second direction Y. Two mounting beams 130 are respectively arranged on both sides of the battery cell assembly 200 in the second direction Y. In this way, the battery cell assembly 200 can be fixedly connected to the mounting beams 130. At the same time, the mounting beams 130 can limit the multiple battery cells 210 in the battery cell assembly 200, restrict the displacement of the battery cell assembly 200 in the second direction Y, limit the expansion of the multiple battery cells 210 in the second direction Y, and enable the battery cells 210 to operate normally.

[0298] In some examples, the mounting beam 130 can be detachably connected to the base plate 110, for example by fastener connection and / or snap-fit ​​connection. The mounting beam 130 can also be welded and / or bonded to the base plate 110.

[0299] In some examples, the mounting beam 130 can be a single piece to reduce the number of parts and improve assembly efficiency. The mounting beam 130 can also include multiple beam segments, all of which extend along the first direction X and are sequentially connected in the second direction Y, thereby reducing the processing difficulty of the mounting beam 130 and improving processing efficiency.

[0300] In the above technical solution, since the battery cell assembly 200 is placed between the two mounting beams 130, the mounting beams 130 can not only improve the structural strength of the base plate 110 and the structural strength of the housing 100, but also fix the battery cell assembly 200 to the mounting beams 130, thereby improving the reliability of fixing the battery cell assembly 200 in the housing 100. In addition, the mounting beams 130 can also limit the displacement of the battery cell assembly 200 in the second direction Y, limit the expansion beams of the multiple battery cells 210 in the battery cell assembly 200 in the second direction Y, and improve the operational stability of the battery device 1000.

[0301] In some embodiments of this application, referring to FIG7, the heat exchange assembly 300 is disposed inside the housing 100.

[0302] The heat exchange component 300 can be located between the bottom wall of the housing 100 and the battery cell assembly 200, or between the top wall of the housing 100 and the battery cell assembly 200, or between the side wall of the housing 100 and the battery cell assembly 200, or between adjacent battery cell assemblies 200, or between two adjacent rows of battery cells 210 within the battery cell assembly 200.

[0303] In the above technical solution, the heat exchange component 300 is located inside the housing 100, which allows the heat exchange component 300 to directly contact and exchange heat with the battery cell 210, reducing heat loss and improving heat exchange efficiency. In addition, the housing 100 can protect the heat exchange component 300, thereby extending its service life.

[0304] In some embodiments of this application, referring to FIG7, the heat exchange assembly 300 includes a plurality of heat exchange tubes 30, each heat exchange tube 30 defining a heat exchange flow channel 31, and the bottom plate 110 of the housing 100 is formed with a plurality of ribs 111, the plurality of ribs 111 cooperating to define a bent and extended receiving groove 112, and the heat exchange tubes 30 are arranged in the receiving groove 112.

[0305] For example, the number of raised ribs 111 on the base plate 110 can be four, eight, ten, twelve, fifteen or more, etc.

[0306] In some examples, the ribs 111 on the base plate 110 can be formed by protruding from the bottom up from a portion of the base plate 110. For example, multiple ribs 111 can be stamped on the base plate 110. Arranging multiple ribs 111 on the base plate 110 can improve the structural strength of the base plate 110 and enhance the support stability of the base plate 110 for the battery cell assembly 200.

[0307] As shown in Figure 7, the plurality of protruding ribs 111 may include a plurality of first protruding ribs 111, which extend along the second direction Y and are spaced apart in the first direction X, with both ends of the first protruding ribs 111 in the second direction Y being spaced apart from the mounting beam 130. Further, the plurality of protruding ribs 111 also include second protruding ribs 111, which extend along the first direction X and are arranged on one side of the plurality of first protruding ribs 111 in the second direction Y. Receiving grooves 112 are formed between the plurality of first protruding ribs 111, between the first protruding ribs 111 and the second protruding ribs 111, between the plurality of first protruding ribs 111 and the mounting beam 130, and between the second protruding ribs 111 and the mounting beam 130.

[0308] The heat exchange tube 30 is arranged within the receiving groove 112, meaning it is positioned between multiple ribs 111. This allows the ribs 111 to provide support between the base plate 110 and the battery cell assembly 200, reducing the pressure exerted by the battery cell assembly 200 on the heat exchange tube 30 and improving its reliability. Furthermore, the upper surface of the ribs 111 is flush with the upper surface of the heat exchange tube 30. This further reduces the pressure exerted by the battery cell assembly 200 on the heat exchange tube 30 while ensuring close contact and heat exchange between the heat exchange tube 30 and the battery cell 210, thus extending the service life of the heat exchange assembly 300.

[0309] In the above technical solution, since the heat exchange tubes 30 of the heat exchange assembly 300 are arranged in the receiving grooves 112 defined by multiple protrusions 111 on the base plate 110, the protrusions 111 can not only improve the structural strength of the base plate 110 and enhance the support stability of the base plate 110 for the battery cell assembly 200, but also reduce the pressure of the battery cell assembly 200 on the heat exchange tubes 30 and improve the service life of the heat exchange assembly 300.

[0310] In some embodiments of this application, referring to Figures 2 and 7, the ratio of the length dimension of the housing 100 in the first direction X to the width dimension of the housing 100 in the second direction Y is greater than 2, where the second direction Y is the width direction of the battery device 1000.

[0311] For example, the outer contour of the box 100 is a cuboid shape, and the length of the box 100 is greater than twice the width of the box 100. For example, the ratio of the length to the width of the box 100 can be 2.2, 2.4, 2.6, 2.8, 3, 3.2, 3.5, or 4 or higher, etc. In this case, the box 100 is a long box shape with a length much greater than its width.

[0312] Since the length of the housing 100 in this application is greater than twice its width, the battery device 1000 is quite long. If a related technical solution is adopted: multiple heat exchange channels of the heat exchange assembly are arranged along the width of the housing, and each heat exchange channel extends back and forth along the length of the housing for heat exchange with individual battery cells. Because the back-and-forth extension of the heat exchange channels requires bending at a certain bending radius, some battery cells will be located in the area between the two channel segments connecting the two ends of the bend. Battery cells in this area do not contact the heat exchange channels, and there will be a significant temperature difference between the battery cells that exchange heat without contact with the heat exchange channels and those that do.

[0313] Therefore, the length of the housing 100 in this application is greater than twice the width of the housing 100, and the main body 311 of the multiple heat exchange channels 31 is arranged along the length of the housing 100. This facilitates the bending design of the main body 311, making it easier for the multiple heat exchange channels 31 to contact and exchange heat with all battery cells 210, thereby improving the temperature uniformity among the battery cells 210.

[0314] Meanwhile, if the heat exchange channel in the related technology extends back and forth along the length of the battery device and multiple heat exchange channels are arranged along the width of the battery device, the length of the housing 100 in this application is relatively long. The channel section extending along the length of the housing needs to extend from one end of the housing to the other end. The extension distance of this channel section is relatively long. When the heat exchange medium flows from one end to the other end in this channel section, since the heat exchange medium needs to exchange heat with multiple battery cells arranged sequentially along the length of the battery device, the temperature of the heat exchange medium will gradually decrease or gradually increase. This will result in a large temperature difference between the heat exchange medium at both ends of the channel section. Due to the large temperature difference of the heat exchange medium, after exchanging heat with the battery cells at both ends, the temperature difference between the battery cells at both ends along the length of the battery device is also large.

[0315] Therefore, by arranging the flow channel body 311 of the heat exchange flow channel 31 along the length direction of the battery device 1000, this application can reduce the extension length of the heat exchange flow channel 31 or the flow channel section of the flow channel body 311 in the length direction of the battery device 1000, reduce the temperature difference between the two ends of the flow channel section extending along the length direction of the battery device 1000, make the heat exchange temperature of the heat exchange medium at both ends of the flow channel section more consistent, make the heat exchange efficiency between the two ends of the flow channel section and the battery cell 210 more consistent, and improve the temperature uniformity between the battery cells 210.

[0316] Furthermore, the flow channels of the main body 311 of this application are centrally arranged, and multiple flow channel bodies 311 are arranged along the length direction of the battery device 1000. In this way, multiple flow channel bodies 311 can exchange heat with the battery cells 210 at different positions in the length direction of the battery device 1000, so as to achieve independent and precise control of the temperature of the battery cells 210 at the corresponding positions. This allows for precise control of the temperature difference between the battery cells 210 in different positions in the length direction of the housing 100, thereby improving the temperature uniformity between the battery cells 210.

[0317] In the above technical solution, since the length-to-width ratio of the housing 100 is greater than 2, the battery device 1000 can have a narrower width, reducing the space occupied in the width direction and facilitating the assembly of the battery device 1000. By making the length dimension of the housing 100 greater than twice the width dimension of the housing 100, the main body 311 of the multiple heat exchange channels 31 is arranged along the length direction of the battery device 1000. As a result, the temperature difference between the battery cells 210 inside the housing can be reduced, and the temperature uniformity between the battery cells 210 can be improved.

[0318] In some embodiments of this application, referring to Figures 2 and 7, the ratio of the height dimension of the box 100 in the third direction Z to the width dimension of the box 100 in the second direction Y is less than 0.3, and the third direction Z intersects with the second direction Y.

[0319] For example, the outer contour of the box 100 is a cuboid shape, and the ratio of the height to the width of the box 100 is less than 0.3. The ratio of the height to the width of the box 100 can be 0.3, 0.29, 0.28, 0.27, 0.26, 0.25, 0.23, 0.21, 0.2, 0.18, and 0.15, etc. In this case, the box 100 is a low box shape with a height much smaller than its width.

[0320] In the above technical solution, since the height-to-width ratio of the housing 100 is less than 0.3, the battery device 1000 can have a thinner thickness, which is beneficial for the assembly of the battery device 1000 and reduces the space occupied in the height direction.

[0321] In some embodiments of this application, referring to Figures 2 and 7, the thickness of the housing 100 in the third direction Z is greater than or equal to 20 mm and less than or equal to 50 mm.

[0322] For example, the thickness of the enclosure 100 can be 20mm, 25mm, 30mm, 35mm, 40mm, 45mm or 50mm, etc.

[0323] In the above technical solution, the thickness of the housing 100 in the third direction Z is greater than or equal to 20mm and less than or equal to 50mm, which allows the battery device 1000 to have a thinner thickness, which is beneficial to the assembly of the battery device 1000 and optimizes the position arrangement of the battery device 1000.

[0324] Secondly, embodiments of this application also provide an electrical device 1, including the battery device 1000 of any of the above embodiments.

[0325] In the above technical solution, since the power-consuming device 1 is equipped with the aforementioned battery device 1000, and the heat exchange channels 31 of the battery device 1000 form channel bodies 311, and the channel bodies 311 of multiple heat exchange channels 31 are arranged along the length direction of the battery device 1000, and the inlets 3103 and outlets 3104 of multiple heat exchange channels 31 are all located at the same end of the battery device 1000 in the first direction X, this not only allows the inlets 3103 and outlets 3104 of multiple heat exchange channels 31 to be centrally located, simplifying the structure and layout of external pipelines, reducing installation and maintenance difficulty, but also reduces... With minimal space occupation, different flow channel bodies 311 can also exchange heat with different areas of the battery device 1000 along the length direction, reducing the temperature difference between battery cells 210 at different positions along the length direction of the battery device 1000, improving the temperature uniformity of the battery device 1000 along the length direction, improving the temperature uniformity between the battery cells 210 corresponding to each heat exchange flow channel 31, improving the temperature uniformity between the battery cells 210 at the edge of the housing 100 and the battery cells 210 near the middle of the housing 100, and improving the temperature uniformity performance of the battery device 1000. Meanwhile, by varying the number of battery cells 210 that are attached to and heat-exchange in at least two flow channel bodies 311, the number of battery cells 210 attached to and heat-exchange in each flow channel body 311 can be set according to the heat exchange requirements of battery cells 210 in different heat exchange areas, thereby improving the heat exchange efficiency of battery cells 210 in the corresponding heat exchange areas. The number of battery cells 210 attached to and heat-exchange in each flow channel body 311 can also be set according to the extension length of the flow channel body 311, thereby meeting the heat exchange requirements of each battery cell 210, improving the temperature uniformity among battery cells 210, and thus improving the overall performance of the electrical device 1.

[0326] In some embodiments of this application, the electrical device 1 is a vehicle, and the first direction X is the forward and backward direction of the vehicle.

[0327] It should be noted that in the prior art, the battery device 1000 includes a battery module, and the stacking direction of the battery cells 210 in the battery module is along the front and rear direction of the vehicle. When a serpentine water cooling pipe is provided at the bottom of the battery module, the water cooling pipe is divided into left and right parts so that the water cooling channel can provide a heat exchange surface for each cell.

[0328] However, when the width of the battery cell 210 does not match the width of the housing 100 of the battery device 1000, resulting in the stacking direction of the battery cells 210 of the battery module being along the left and right directions of the vehicle, the water cooling pipe divided into left and right parts will have the following problems: Since the water cooling pipe needs to have a certain bending radius when bent, there must be at least one channel width of spacing between the flow channels. The battery cells 210 located between the flow channels arranged adjacent to each other in the left and right directions cannot be directly attached to the flow channels to be cooled or heated, which can easily cause the temperature of the battery cells 210 in this part to be too high or too low, resulting in a large temperature difference between the battery cells 210, which is not conducive to temperature difference management between the battery cells 210.

[0329] In this application, the length direction of the housing 100 of the battery device 1000 is the first direction X, which is the front-rear direction of the vehicle. The battery cell assembly 200 inside the housing 100 includes multiple rows of battery cells 210, which are arranged in the front-rear direction. Each row of battery cells 210 is stacked along the left-right direction of the vehicle (the thickness direction of the battery cells 210 is parallel to the left-right direction).

[0330] The heat exchange assembly 300 includes multiple heat exchange channels 31. The main bodies 311 of the multiple heat exchange channels 31 are arranged in a front-to-back manner. Specifically, the inlet 3103 and outlet 3104 of the multiple heat exchange channels 31 are located at the front end of the battery device 1000. Each heat exchange channel 31 has a main body 311. The multiple main bodies 311 are arranged sequentially in the front-to-back direction. Each heat exchange channel 31 extends from the front end of the battery device 1000 along the left and right sides to the rear, and then extends to the corresponding arrangement area of ​​the main body 311. In the arrangement area of ​​the main body 311, the main body 311 extends in a meandering manner in the left and right direction to exchange heat with each battery cell 210, and then gradually extends to the front end of the battery device 1000.

[0331] In the above technical solution, the length direction of the battery device 1000 is along the front-rear direction of the vehicle, which makes it convenient to arrange the battery device 1000 on the vehicle and facilitates the assembly of the battery device 1000.

[0332] A vehicle according to a specific embodiment of this application will now be described with reference to Figures 1-7.

[0333] Referring to Figure 1, the vehicle includes a battery device 1000, which provides electrical energy to the vehicle.

[0334] Specifically, as shown in Figures 1-4, the battery device 1000 includes a housing 100, a battery cell assembly 200, and a heat exchange assembly 300. The housing 100 includes a bottom plate 110 and a top cover 120. The top cover 120 covers the upper side of the bottom plate 110 and cooperates with the bottom plate 110 to define an accommodating cavity. The bottom plate 110 is plate-shaped, and the front edge of the bottom plate 110 is provided with an upwardly extending mounting plate 113. The top cover 120 is box-shaped with its lower side open. The front edge of the top cover 120 forms a clearance opening that matches the shape of the mounting plate 113. When the top cover 120 is placed on the bottom plate 110, the mounting plate 113 covers the clearance opening. A sealing element 140 is provided between the top cover 120 and the bottom plate 110 to seal the gap between the top cover 120 and the bottom plate 110.

[0335] The housing 100 also includes mounting beams 130, which are located in the accommodating cavity and fixed to the base plate 110. There are two mounting beams 130, which extend forward and backward and are respectively arranged on the left and right sides of the base plate 110 near the edge.

[0336] The base plate 110 also has a plurality of ribs 111, which include a plurality of first ribs 111 and second ribs 111. The plurality of first ribs 111 extend to the left and right and are spaced apart in the front and back direction. The second ribs 111 extend in the front and back direction and are arranged on one side of the plurality of ribs 111 in the left and right direction. The plurality of ribs 111, the base plate 110 and the mounting beam 130 cooperate to define a receiving groove 112 for accommodating a plurality of heat exchange tubes 30 of the heat exchange assembly 300.

[0337] Both the battery cell assembly 200 and the heat exchange assembly 300 are housed within the receiving cavity. Multiple battery cell assemblies 200 are arranged sequentially along a front-to-back direction. Each battery cell assembly 200 includes two rows of battery cells 210 arranged side-by-side along the front-to-back direction. Multiple battery cells 210 within each row are stacked sequentially along a left-to-right direction, with the thickness of each battery cell 210 along the left-to-right direction. All battery cell assemblies 200 are positioned between two mounting beams 130.

[0338] The heat exchange assembly 300 is arranged between the base plate 110 and the battery cell assembly 200. The heat exchange assembly 300 includes a plurality of heat exchange tubes 30, each heat exchange tube 30 is bent and extended and arranged in the receiving groove 112, and the bending position of the heat exchange tube 30 is rounded. The inner side of each heat exchange tube 30 defines a heat exchange flow channel 31, and at least a portion of each heat exchange flow channel 31 is formed as a flow channel body 311. The flow channel bodies 311 of the plurality of heat exchange tubes 30 are arranged sequentially in the front-back direction. The inlet 3103 and outlet 3104 of each heat exchange channel are arranged on the front side of the battery device 1000.

[0339] Each flow channel body 311 includes a first heat exchange section 3111 and a second heat exchange section 3112. The first heat exchange section 3111 includes two horizontal sections 3101 and a vertical section 3102. The two horizontal sections 3101 extend left and right and are arranged at intervals in the front and back direction. The vertical section 3102 extends front and back and is arranged on one side of the two horizontal sections 3101 in the left and right direction. The front and rear ends of the vertical section 3102 are respectively connected to the ends of the two horizontal sections 3101. At this time, the first heat exchange section 3111 is U-shaped and opens to one side in the left and right direction.

[0340] The second heat exchange section 3112 is arranged between the two horizontal sections 3101 of the first heat exchange section 3111. The second heat exchange section 3112 includes a plurality of horizontal sections 3101 that extend in the left and right directions, are spaced apart in the front and back directions, and are sequentially bent and connected.

[0341] In a specific example, there are two heat exchange tubes 30, one of which defines a first heat exchange channel 31a on its inner side, and the other heat exchange tube 30 defines a second heat exchange channel 31b on its inner side. The first heat exchange channel 31a is entirely formed as a channel body 311 and is arranged in front of the channel body 311 of the second heat exchange channel 31b.

[0342] The second heat exchange channel 31b includes a first connecting part 312, a channel body 311, and a second connecting part 313 connected in sequence. The first connecting part 312 and the second connecting part 313 both extend in the front-back direction and are arranged at intervals in the left-right direction. The first connecting part 312 and the second connecting part 313 are both arranged on the side where the U-shaped opening of the first heat exchange part 3111 of the first heat exchange channel 31a is located.

[0343] The first heat exchange channel 31a and the second heat exchange channel 31b extend from their respective inlets 3103 to outlets 3104, and the ratio of the extension length of the second heat exchange channel 31b to the extension length of the first heat exchange channel 31a is greater than or equal to 1 and less than or equal to 1.2. The width of the heat exchange channel 31 is a first width, and the dimension of the battery cell 210 in the front-rear direction is a second width, with the ratio of the first width to the second width being greater than or equal to one-third. The bottom surface of the battery cell 210 is a first wall surface that mates with the heat exchange tube 30, and the projected area of ​​the heat exchange tube 30 on the first wall surface is greater than one-third of the area of ​​the first wall surface. This improves the temperature rise or cooling rate of the battery cell 210.

[0344] The heat exchange assembly 300 also includes a first sleeve 321 and a second sleeve 322. The first sleeve 321 extends left and right, and its two ends are respectively connected to the inlet 3103 of the first heat exchange channel 31a and the inlet 3103 of the second heat exchange channel 31b. The second sleeve 322 extends left and right, and its two ends are respectively connected to the outlet 3104 of the first heat exchange channel 31a and the outlet 3104 of the second heat exchange channel 31b.

[0345] The heat exchange assembly 300 also includes an inlet pipe 331 and an outlet pipe 332. One end of the inlet pipe 331 is connected to the first sleeve 321 and the other end is connected to the inlet connector. One end of the outlet pipe 332 is connected to the second sleeve 322 and the other end is connected to the outlet connector. The inlet connector and the outlet connector are both installed and fixed on the mounting plate 113 at the front end of the base plate 110.

[0346] In the above technical solution, each row of battery cells 210 in the battery cell assembly 200 is stacked in the left-right direction, and the thickness direction of the battery cell 210 is in the left-right direction. The multiple heat exchange channels 31 of the heat exchange tube 30 all run from the front end of the battery device 1000 along the left and right sides to the rear, and then bend at 90 degrees to continue to extend the heat exchange channels 31 in the left-right direction, and gradually return to the front end of the battery device 1000. The main body 311 of the multiple heat exchange channels 31 is arranged in front and behind, thereby realizing heat exchange between the heat exchange channels 31 and each battery cell 210, and improving the temperature uniformity between the battery cells 210.

[0347] 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 (1000), comprising: Box (100); A battery cell assembly (200) is disposed within the housing (100), and the battery cell assembly (200) includes a plurality of battery cells (210); A heat exchange assembly (300) is provided for heat exchange with the battery cell (210). The heat exchange assembly (300) includes a plurality of heat exchange channels (31) connected in parallel. The inlet (3103) and outlet (3104) of the plurality of heat exchange channels (31) are arranged at the same end of the battery device (1000) in a first direction (X), where the first direction (X) is the length direction of the battery device (1000). At least a portion of each heat exchange channel (31) is formed as a channel body (311), and a plurality of channel bodies (311) are arranged sequentially along the first direction (X), and at least two channel bodies (311) are attached to exchange heat with different numbers of battery cells (210).

2. The battery device (1000) according to claim 1, wherein, In the direction along the first direction (X) and gradually away from the inlet (3103) and the outlet (3104), the number of the multiple flow channel bodies (311) that are in contact with the heat exchanged battery cells (210) decreases.

3. The battery device (1000) according to claim 2, wherein, Along the first direction (X) and gradually away from the inlet (3103) and the outlet (3104), the number of the multiple flow channel bodies (311) that are attached to the heat exchanged battery cells (210) decreases sequentially.

4. The battery device (1000) according to any one of claims 1-3, wherein, At least two of the flow channel bodies (311) have different heat exchange contact areas with the battery cell assembly (200).

5. The battery device (1000) according to claim 4, wherein, Along the first direction (X) and gradually away from the inlet (3103) and the outlet (3104), the heat exchange contact area between the plurality of flow channel bodies (311) and the battery cell assembly (200) is reduced.

6. The battery device (1000) according to claim 5, wherein, Along the first direction (X) and gradually away from the inlet (3103) and the outlet (3104), the heat exchange contact area between the plurality of flow channel bodies (311) and the battery cell assembly (200) gradually decreases.

7. The battery device (1000) according to any one of claims 1-6, wherein, At least two of the flow channel bodies (311) have different outer contour widths in the first direction (X).

8. The battery device (1000) according to claim 7, wherein, In the direction along the first direction (X) and gradually away from the inlet (3103) and the outlet (3104), the outer contour width of the plurality of flow channel bodies (311) in the first direction (X) decreases.

9. The battery device (1000) according to claim 8, wherein, Along the first direction (X) and gradually away from the inlet (3103) and the outlet (3104), the outer contour width of the plurality of flow channel bodies (311) decreases sequentially in the first direction (X).

10. The battery device (1000) according to claim 8 or 9, wherein, The number of heat exchange channels (31) is two, including a first heat exchange channel (31a) and a second heat exchange channel (31b). The main body (311) of the first heat exchange channel (31a) is located closest to the inlet (3103) and the outlet (3104). The ratio of the outer contour width of the main body (311) of the second heat exchange channel (31b) in the first direction (X) to the total outer contour width of all battery cell assemblies (200) of the battery device (1000) in the first direction (X) is greater than or equal to 1 / 3 and less than 1 / 2.

11. The battery device (1000) according to any one of claims 1-10, wherein, The number of heat exchange channels (31) is two, namely a first heat exchange channel (31a) and a second heat exchange channel (31b). The main body (311) of the first heat exchange channel (31a) is located close to the inlet (3103) and the outlet (3104). Each of the heat exchange channels (31) extends from the inlet (3103) to the outlet (3104), wherein the ratio of the extension length of the second heat exchange channel (31b) to the extension length of the first heat exchange channel (31a) is greater than or equal to 1 and less than or equal to 1.

2.

12. The battery device (1000) according to any one of claims 1-11, wherein, The plurality of heat exchange channels (31) include a first heat exchange channel (31a) and a second heat exchange channel (31b), wherein the channel body (311) of the first heat exchange channel (31a) is disposed closest to the inlet (3103) and the outlet (3104). The second heat exchange channel (31b) further includes a first connecting portion (312) and a second connecting portion (313), wherein the first connecting portion (312), the channel body (311) and the second connecting portion (313) are connected in sequence, the end of the first connecting portion (312) away from the channel body (311) forms the inlet (3103), and the end of the second connecting portion (313) away from the channel body (311) forms the outlet (3104); wherein the first connecting portion (312) and the second connecting portion (313) both extend along the first direction (X).

13. The battery device (1000) according to claim 12, wherein, The first connecting portion (312) is closer to the edge of the housing (100) in the second direction (Y) than the second connecting portion (313), and the second direction (Y) intersects with the first direction (X).

14. The battery device (1000) according to claim 12 or 13, wherein, The first connecting part (312) and the second connecting part (313) are arranged on the same side of the first heat exchange channel (31a) in the second direction (Y).

15. The battery device (1000) according to any one of claims 1-14, wherein, The inlets (3103) of the multiple heat exchange channels (31) are all connected, and the outlets (3104) of the multiple heat exchange channels (31) are all connected.

16. The battery device (1000) according to any one of claims 1-15, wherein, The heat exchange channel (31) includes a horizontal portion (3101) and a vertical portion (3102), the vertical portion (3102) extending along a first direction (X), and the horizontal portion (3101) extending along a second direction (Y), the second direction (Y) being the width direction of the battery device (1000); wherein the vertical portion (3102) is closer to the edge of the housing (100) than the horizontal portion (3101).

17. The battery device (1000) according to claim 16, wherein, The plurality of transverse portions (3101) in the flow channel body (311) are spaced apart and connected in sequence in the first direction (X), and the longitudinal portion (3102) in the flow channel body (311) is connected to at least a portion of the transverse portions (3101).

18. The battery device (1000) according to any one of claims 1-17, wherein, The flow channel body (311) includes: a first heat exchange section (3111) and a second heat exchange section (3112), wherein the first heat exchange section (3111) is bent and extends to define a U-shaped region, and the second heat exchange section (3112) is bent and arranged in the U-shaped region, and the second heat exchange section (3112) is bent and connected to one end of the first heat exchange section (3111).

19. The battery device (1000) according to claim 18, wherein, The second heat exchange section (3112) includes a plurality of horizontal sections (3101), which extend along a second direction (Y) and are spaced apart along a first direction (X). The second direction (Y) is the width direction of the battery device (1000). The plurality of horizontal sections (3101) of the second heat exchange section (3112) are sequentially bent and connected along the first direction (X).

20. The battery device (1000) according to claim 18 or 19, wherein, The first heat exchange section (3111) includes two horizontal sections (3101) and one vertical section (3102). The two horizontal sections (3101) extend along a second direction (Y) and are spaced apart in a first direction (X). The second direction (Y) is the width direction of the battery device (1000). The vertical section (3102) extends along the first direction (X) and is connected between the two horizontal sections (3101).

21. The battery device (1000) according to any one of claims 1-20, wherein, The heat exchange assembly (300) includes a plurality of heat exchange tubes (30), each of the heat exchange tubes (30) being bent and extending to define a heat exchange channel (31).

22. The battery device (1000) according to any one of claims 1-21, wherein, The battery cell assembly (200) includes multiple rows of battery cells (210), with multiple battery cells (210) stacked in a row along a second direction (Y), and multiple rows of battery cells (210) arranged in the battery cell assembly (200) along a first direction (X). The heat exchange assembly (300) is arranged on at least one side of the battery cell assembly (200) in a third direction (Z). The second direction (Y) is the width direction of the battery device (1000), and the first direction (X), the second direction (Y), and the third direction (Z) are arranged at angles to each other.

23. The battery device (1000) according to claim 22, wherein, The width of the heat exchange channel (31) is a first width, and the dimension of the battery cell (210) in the first direction (X) is a second width. The ratio of the first width to the second width is greater than or equal to one-third.

24. The battery device (1000) according to claim 22 or 23, wherein, The heat exchange assembly (300) includes a plurality of heat exchange tubes (30), each of the heat exchange tubes (30) defining the heat exchange flow channel (31). The battery cell (210) has a first wall surface that cooperates with the heat exchange tube (30) for heat exchange. With the first wall surface as the projection surface, the area of ​​the orthographic projection of the heat exchange tube (30) on the first wall surface is greater than or equal to one-third of the area of ​​the first wall surface.

25. The battery device (1000) according to any one of claims 1-24, wherein, The ratio of the length of the box (100) in the first direction (X) to the width of the box (100) in the second direction (Y) is greater than 2, and the first direction (X) and the second direction (Y) intersect.

26. The battery device (1000) according to any one of claims 1-25, wherein, The ratio of the width dimension of the box (100) in the second direction (Y) to the height dimension of the box (100) in the third direction (Z) is less than 0.3, and the first direction (X), the second direction (Y) and the third direction (Z) intersect each other.

27. The battery device (1000) according to any one of claims 1-26, wherein, The thickness of the housing (100) in the third direction (Z) is greater than or equal to 20 mm and less than or equal to 50 mm, and the third direction (Z) intersects with the first direction (X).

28. An electrical device (1) comprising a battery device (1000) according to any one of claims 1-27.

29. The electrical appliance (1) according to claim 28, wherein, The electrical device (1) is a vehicle, and the first direction (X) is the forward and backward direction of the vehicle.

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