Battery device and electric device

Abstract

The invention discloses a battery device and a power utilization device. The battery device comprises a box body; the battery monomer assembly is arranged in the box body, and the battery monomer assembly comprises a plurality of battery monomers; the heat exchange assembly comprises a plurality of heat exchange flow channels, at least part of each heat exchange flow channel forms a flow channel body, the flow channel bodies of at least two heat exchange flow channels are arranged in the first direction, each heat exchange flow channel comprises an extending part and a bent part, at least part of the extending parts of the multiple heat exchange flow channels extend in the first direction, and at least part of the bent part extends in the second direction. The bending part bends and extends in a reciprocating manner in the second direction, and the extending part wraps the outer side of the bending part in the first plane; wherein the first direction and the second direction are both located in the first plane, and the heat exchange assembly is arranged on at least one side of the battery monomer assembly in the third direction. In the technical mode, the temperature uniformity in the battery device can be improved, and the heat exchange efficiency of the battery monomer assembly can also be improved.

Description

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 normal operation and lifespan of batteries, heat exchange components are typically installed inside the battery. These components exchange heat with the individual battery cells to regulate the temperature of each cell, thereby ensuring battery life. However, currently, the temperature uniformity among multiple battery cells within the battery 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, which can improve the temperature uniformity within the battery device and improve the heat exchange efficiency of the battery cell assembly.

[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 including a plurality of heat exchange channels, at least a portion of each heat exchange channel forming a channel body, the channel bodies of at least two heat exchange channels being arranged along a first direction, each heat exchange channel including an extension and a bend, at least a portion of the extensions of the plurality of heat exchange channels extending along the first direction, the bends extending and bending in a second direction, the extensions being disposed on the outside of the bends within a first plane; wherein the first direction and the second direction are both located within the first plane, the heat exchange assembly is arranged on at least one side of the battery cell assembly in a third direction for heat exchange with the battery cells, and the first direction, the second direction, and the third direction intersect each other.

[0006] In the aforementioned technical approach, since the heat exchange channels are formed with channel bodies, and at least two heat exchange channel bodies are arranged along the length of the battery device, different channel bodies can exchange heat with different regions of the battery device along the length, thereby reducing the temperature difference between battery cells at different positions along the length and improving the temperature uniformity of the battery device along the length. Simultaneously, since the heat exchange channels include extensions and bends, with the extensions covering the outside of the bends, the extensions can exchange heat with the outer battery cells near the edge of the housing, and the bends can exchange heat with the battery cells near the center of the housing. When the heat exchange medium flows sequentially into the extensions and bends, it can compensate for the internal and external temperature differences caused by heat exchange with the environment between the outer battery cells near the edge and the battery cells near the center of the housing. This makes the heat exchange effect of the outer 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, to a certain extent, extending the service life of the battery device.

[0007] In some embodiments, the extensions of the plurality of heat exchange channels constitute four extension sections, which are arranged sequentially along the circumference of the heat exchange assembly, and together the four extension sections cover the bends of the plurality of heat exchange channels.

[0008] In the above-mentioned technical approach, the extensions of multiple heat exchange channels constitute four extension sections. The four extension sections are arranged sequentially along the circumference of the heat exchange assembly and enclose the bending portion. This allows for a more compact structure of the heat exchange channels and an extension of the circumferential length of the heat exchange channels in the housing, enabling them to fit closely with the peripheral battery cells arranged near the edge of the housing for heat exchange, thereby improving the thermal management efficiency of the peripheral battery cells and enhancing the temperature uniformity among the peripheral battery cells.

[0009] In some embodiments, the four extension segments are a first extension segment, a second extension segment, a third extension segment, and a fourth extension segment. The first extension segment and the third extension segment both extend along a first direction and are spaced apart in a second direction. The second extension segment and the fourth extension segment both extend along a second direction and are spaced apart in a first direction.

[0010] In the above technical solution, the first extension section, the second extension section, the third extension section and the fourth extension section can enclose a rectangular frame structure, which can not only improve the overall integrity of the heat exchange component, compact the structure of the heat exchange channel, increase the heat exchange area between the heat exchange component and the battery cell component, and improve the heat exchange efficiency, but also exchange heat with all the peripheral battery cells through the four extension sections, thereby improving the heat exchange efficiency and temperature uniformity of the peripheral battery cells.

[0011] In some embodiments, adjacent extensions are connected or spaced apart in the circumferential direction of the heat exchange assembly.

[0012] In the above technical solution, the connection of two adjacent extensions can enhance the overall integrity of the heat exchange assembly and improve its structural strength. The spacing of two adjacent extensions can reduce mutual interference between adjacent heat exchange channels and facilitate the processing and manufacturing of the heat exchange channels.

[0013] In some embodiments, each heat exchange channel includes at least two extensions, the multiple extensions of the heat exchange channel are connected in sequence, and the two connected extensions have different extension directions. The bend is connected to the downstream or upstream side of the multiple extensions in the fluid flow direction.

[0014] In the above technical solution, multiple extensions of each heat exchange channel are connected in sequence, and the bend is connected to the downstream or upstream side of the multiple extensions in the direction of fluid flow. This not only facilitates the cooperation of multiple extensions of multiple heat exchange channels to surround the bend, but also reduces the temperature difference between the inner and outer cells of the battery cells caused by heat dissipation to the environment, and improves the temperature uniformity between the outer battery cells and the inner battery cells near the edge of the housing.

[0015] In some embodiments, the flow channel body includes two extensions and a bend, the two extensions being a first extension and a second extension, the first extension extending along a second direction and the second extension extending along a first direction, the first extension, the second extension and the bend being connected in sequence, and the bend being arranged on the side of the two extensions away from the edge of the housing.

[0016] In the above technical solution, since the two extensions of the main body of the flow channel are bent and connected, and the bent part is arranged on the inner side of the two extensions, 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.

[0017] In some embodiments, the bending portion includes a plurality of horizontal portions 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 portions of the bending portion are sequentially bent and connected along the first direction.

[0018] In the above technical solution, the bending part includes multiple horizontal parts. Multiple horizontal parts can increase the heat exchange area of ​​the bending part, improve the heat exchange efficiency, make the heat of the bending part evenly distributed, and improve the temperature uniformity between battery cells. In addition, the multiple horizontal parts are bent and connected in sequence, which can simplify the structure of the bending part and facilitate the processing and forming of the bending part.

[0019] In some embodiments, the connection point between two adjacent horizontal sections is bent into a semi-circular arc.

[0020] In the above technical solution, the connection position of the two horizontal parts of the bend is bent into a semi-circular arc. This not only allows the two horizontal parts to be arranged in parallel and spaced apart, making the bend structure compact and improving the heat exchange efficiency, but also reduces the flow resistance of the heat exchange medium, reduces pressure drop, further improves the heat exchange efficiency of the bend, and reduces stress concentration at the bend position, thus extending the service life of the heat exchange components.

[0021] In some embodiments, the connection position between the first extension and the second extension is bent into a quarter-circle shape, and the connection position between the second extension and the bent portion is bent into a quarter-circle shape.

[0022] In the above technical solution, the connection points between the first extension and the second extension, and between the second extension and the bend, are both bent into quarter-circle shapes. 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 components. Furthermore, it facilitates the processing and shaping of the flow channel body, reducing the risk of leakage at the connection points.

[0023] In some embodiments, the inlets and outlets of the plurality of heat exchange channels are located at the same end of the battery device in a first direction.

[0024] In the above technical solution, the inlets and outlets of multiple heat exchange channels are all located at the same end of the battery device in the first direction. This allows for the centralized arrangement of the inlets and outlets of multiple heat exchange channels, facilitating the centralized connection of multiple heat exchange channels to external pipelines. This simplifies the structure and layout of external pipelines, reduces installation and maintenance difficulty, and also reduces the space required for the arrangement of inlets, outlets, and external pipes, resulting in a compact structure, reduced space occupation, and improved space utilization. Furthermore, it enhances the temperature uniformity between the battery cells corresponding to each heat exchange channel, improves the temperature uniformity between battery cells at the edge of the housing and those near the center of the housing, reduces the probability of localized overheating or underheating in the battery device, and improves the temperature uniformity performance of the battery device.

[0025] 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.

[0026] 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.

[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 respectively form the inlet and outlet of the second heat exchange channel. Therefore, the inlet and outlet of the second heat exchange channel can be arranged on the other side of the channel body of the first heat exchange channel away from the second heat exchange channel, which is beneficial for concentrating the inlet and outlet of the first heat exchange channel and the inlet and outlet of the second heat exchange channel, facilitating centralized connection to external pipelines, resulting in a compact structure, convenient maintenance, and reduced space occupation. In addition, the first connecting part and the second connecting part can increase the heat exchange area of ​​the second heat exchange channel, improving heat exchange efficiency. The first connecting part and the second connecting part can reduce the temperature difference between the battery cells near the edge of the housing and in contact with the first connecting part and the second connecting part, and the battery cells near the center of the housing. It can also reduce the probability of localized overheating or underheating within the battery device, improving the temperature uniformity among the 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.

[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 first connection portion is in contact with the outermost battery cell in the battery cell assembly arranged in the second direction for heat exchange.

[0034] In the above technical solution, the first connecting part is in contact with the outermost battery cell in the second direction for heat exchange, which can increase the contact area between the outermost battery cell in the second direction and the heat exchange channel, improve the heat exchange efficiency of the outermost battery cell in the second direction, balance the internal and external temperature difference between battery cells caused by the ambient temperature, and thus improve the temperature uniformity between battery cells.

[0035] In some embodiments, the distance between the first connecting portion and the second connecting portion in the second direction is less than the thickness of the battery cell in the second direction.

[0036] In the above technical solution, since the distance between the first connecting part and the second connecting part in the second direction is less than the thickness of the battery cell in the second direction, the first connecting part can exchange heat with the outermost battery cell in the second direction, and the second connecting part can exchange heat with the battery cell adjacent to the first connecting part. This allows each battery cell to fit and exchange heat with the heat exchange channel, avoiding the situation where the battery cell between the first connecting part and the second connecting part cannot exchange heat with either the first connecting part or the second connecting part, thus improving the temperature uniformity between battery cells.

[0037] In some embodiments, each heat exchange channel has an inlet and an outlet, and each heat exchange channel extends from the inlet to the outlet, wherein the ratio of the extension lengths of any two heat exchange channels is 0.8-1.2.

[0038] In the above technical solution, setting the ratio of the extension lengths of any two heat exchange channels to 0.8-1.2 can make the extension lengths of any two heat exchange channels relatively close, so that the flow distance of the heat exchange medium in each heat exchange channel is relatively uniform, and the flow resistance in each heat exchange channel is similar, thereby making the heat exchange efficiency of each heat exchange channel uniform, and thus improving the temperature uniformity between the battery cells corresponding to each heat exchange channel.

[0039] In some embodiments, a 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 first direction to form a battery cell assembly. The number of battery cell assemblies is multiple, and the multiple battery cell assemblies are arranged sequentially along the first direction.

[0040] 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 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 battery cells not contacting the flow channels in the corresponding heat exchange area, thereby improving the temperature uniformity between battery cells.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] In some embodiments, the heat exchange assembly is disposed within the housing.

[0046] In the above technical solution, the heat exchange components are housed inside the casing, which allows for convenient direct contact and heat exchange between the components and individual battery cells, reducing heat loss and improving heat exchange efficiency. Furthermore, the casing protects the heat exchange components, thereby extending their service life.

[0047] In some embodiments, the heat exchange assembly includes heat exchange tubes that define heat exchange channels, and the bottom plate of the housing is formed with a plurality of ribs that cooperate to define a bent and extended receiving groove, in which the heat exchange tubes are arranged.

[0048] In the above technical solution, since the heat exchange tubes of the heat exchange component are arranged in the receiving groove defined by multiple protrusions on the base plate, the protrusions can not only improve the structural strength of the base plate and enhance the support stability of the base plate for the battery cell assembly, but also reduce the pressure of the battery cell assembly on the heat exchange tubes and improve the service life of the heat exchange component.

[0049] Secondly, embodiments of this application provide an electrical device, including a battery device according to the first aspect of this application.

[0050] In the above-described embodiments, by providing the battery device of the first aspect, and by forming a channel body for each of the multiple heat exchange channels of the heat exchange assembly, with at least two channel bodies arranged along the length of the battery device, different channel bodies can exchange heat with different regions of the battery device along the length, thereby reducing the temperature difference between battery cells at different positions along the length and improving the temperature uniformity of the battery device along the length. Furthermore, since the heat exchange channel includes an extension and a bend, with the extension covering the outside of the bend, the extension can prevent other debris or impurities from entering the inside of the extension. It can also exchange heat with battery cells closer to the edge of the housing, improving the thermal management efficiency of battery cells at the edge of the housing. Additionally, the structure of the heat exchange channel is compact, increasing its length and improving the heat exchange efficiency of the battery cell assembly, thereby improving the overall performance of the electrical device.

[0051] In some embodiments, the electrical device is a vehicle, and the first direction is the forward and backward direction of the vehicle.

[0052] 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.

[0053] 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

[0054] Figure 1This is a structural schematic diagram of a vehicle according to an embodiment of this application;

[0055] Figure 2 This is a schematic diagram of the structure of a battery device according to an embodiment of this application;

[0056] Figure 3 This is an exploded view of the battery device according to an embodiment of this application, showing only the top cover of the device exploded.

[0057] Figure 4 This is an exploded view of a battery device according to an embodiment of this application;

[0058] Figure 5 This is a schematic diagram of multiple battery cell assemblies and heat exchange assemblies of a battery device according to an embodiment of this application;

[0059] Figure 6 yes Figure 5 A partial enlarged view of the battery cell assembly and heat exchange assembly shown;

[0060] Figure 7 This is an exploded view of the battery device according to an embodiment of this application from another angle.

[0061] Figure label:

[0062] 1. Electrical appliances;

[0063] 1000, Battery assembly; 2000, Controller; 3000, Motor;

[0064] 100. Box body;

[0065] 110. Base plate; 111. Rib; 112. Receiving groove; 113. Mounting plate;

[0066] 120. Top cover; 130. Mounting beam; 140. Sealing element;

[0067] 200. Battery cell assembly; 210. Battery cell;

[0068] 300. Heat exchange components;

[0069] 30. Heat exchanger tubes;

[0070] 31. Heat exchange channel; 31a. First heat exchange channel; 31b. Second heat exchange channel;

[0071] 3101. Horizontal section; 3103. Import; 3104. Export;

[0072] 311. Main body of the flow channel;

[0073] 312. First connecting part; 313. Second connecting part;

[0074] 321. First sleeve; 322. Second sleeve; 331. Inlet pipe; 332. Outlet pipe;

[0075] 41. Extension; 42. Bending section;

[0076] 4a. First extension segment; 4b. Second extension segment; 4c. Third extension segment; 4d. Fourth extension segment. Detailed Implementation

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two).

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] Based on the above considerations, in order to improve the temperature uniformity among multiple battery cells within a 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, each with a channel body, and the multiple channel bodies are arranged along the length of the housing. Thus, different channel bodies can exchange heat with battery cells in different areas within the battery device, thereby reducing temperature differences between battery cells at different locations within the battery device, improving temperature uniformity within the battery device, and facilitating the arrangement of the heat exchange channels to ensure convenient contact and heat exchange with each battery cell, further enhancing temperature uniformity among multiple battery cells. Simultaneously, the heat exchange channels include an extension and a bend, with the extension covering the outside of the bend. The extension can prevent other debris or impurities from entering the inside of the extension and can also exchange heat with battery cells closer to the edge of the housing, improving the thermal management efficiency of battery cells at the edge of the housing. The compact structure of the heat exchange channels increases the length of the heat exchange channels, improving the heating and cooling efficiency of the battery cell assembly.

[0099] 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.

[0100] 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.

[0101] Please refer to Figure 1 , Figure 1 The electrical device 1 provided in some embodiments of this application is a schematic diagram of a vehicle structure. The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. 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 controls the battery device 1000 to supply power to the motor 3000, for example, to meet the power needs of starting, navigation, and driving the vehicle. 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.

[0102] The following is for reference. Figures 2-7 A battery device 1000 according to an embodiment of the first aspect of this application is described. Figure 2 This is a schematic diagram of the structure of the battery device 1000 according to an embodiment of this application; Figure 3 This is an exploded view of the battery device 1000 according to an embodiment of this application, showing only the top cover 120 blown open; Figure 4 This is an exploded view of the battery device 1000 according to an embodiment of this application; Figure 5 This is a schematic diagram of a plurality of battery cell assemblies 200 and a heat exchange assembly 300 of a battery device 1000 according to an embodiment of this application; Figure 6 yes Figure 5 A partial enlarged view of the battery cell assembly 200 and the heat exchange assembly 300 shown in the figure; Figure 7 This is an exploded view of the battery device 1000 according to an embodiment of this application from another angle.

[0103] 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.

[0104] This application provides a battery device 1000, such as... Figures 2-7 As shown, 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 a plurality of battery cells 210; a heat exchange assembly 300 includes a plurality of heat exchange channels 31, at least a portion of each heat exchange channel 31 is formed as a channel body 311, and the channel bodies 311 of at least two heat exchange channels 31 are arranged along a first direction X, each heat exchange channel 31 includes an extension 41 and a bend 42, at least a portion of the extension 41 of the plurality of heat exchange channels 31 extends along the first direction X, and the bend 42 extends and bends repeatedly in a second direction Y, and the extension 41 is disposed on the outside of the bend 42 in a first plane; wherein, the first direction X and the second direction Y are both located in the first plane, and the heat exchange assembly 300 is arranged on at least one side of the battery cell assembly 200 in a third direction Z for heat exchange with the battery cells 210, and the first direction X, the second direction Y and the third direction Z intersect each other.

[0105] like Figures 2-4 As shown, the housing 100 defines a receiving cavity, and the battery cell assembly 200 is disposed within the receiving cavity of the housing 100. The heat exchange assembly 300 can be disposed within the receiving cavity of the housing 100 or on the outside of the housing 100. In one example, the housing 100 can be made of aluminum alloy to reduce the weight of the housing 100 while meeting the structural strength requirements, thereby increasing the energy density of the battery device 1000.

[0106] 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.

[0107] The battery cell assembly 200 includes multiple 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.

[0108] like Figure 4 As shown, the heat exchange assembly 300 is arranged on one side of the battery cell assembly 200 in the third direction Z, or 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 assembly 300 can be arranged on the upper or lower side of the battery cell assembly 200, or on both the upper and lower sides of the battery cell assembly 200. In this way, it is convenient for the heat exchange assembly 300 to exchange heat with each battery cell 210, thereby improving temperature uniformity.

[0109] 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, it can carry away heat generated by the battery cell or heat the battery cell.

[0110] 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.

[0111] like Figure 5 As shown, multiple heat exchange channels 31 are arranged in parallel, that is, 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. In this way, the flow rate of the heat exchange medium in each heat exchange channel 31 can be made more uniform, realizing uniform heat exchange for the battery cell 210. In addition, the pressure drop in a single heat exchange channel 31 can be reduced, thereby improving the heat exchange efficiency.

[0112] 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.

[0113] 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.

[0114] In some examples, each heat exchange channel 31 has a channel body 311. For a heat exchange channel 31, only a part of the channel can be formed as the channel body 311, or all the channels can be formed together as the channel body 311.

[0115] 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 along the length direction of the battery device 1000.

[0116] 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.

[0117] The first direction X is the length direction of the battery device 1000. Multiple flow channel bodies 311 are arranged along the length direction of the battery device 1000, which can divide multiple battery cells 210 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 for heat exchange with the battery cells 210 in that region.

[0118] 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 the compact arrangement of the battery cells 210 in the long housing 100.

[0119] Furthermore, since the length of the battery unit 1000 is longer than its width, if the relevant technical solution is adopted: multiple heat exchange channels of the heat exchange assembly are arranged along the width direction of the housing, and each heat exchange channel extends back and forth along the length direction of the housing for heat exchange with the 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 will not be in contact with the heat exchange channels, and there will be a significant temperature difference between the battery cells that are exchanging heat without contact with the heat exchange channels and those that are in contact with the heat exchange channels.

[0120] Therefore, by arranging the main body 311 of multiple heat exchange channels 31 along the length of the housing 100, this application can facilitate the bending design of the main body 311, making it easier for multiple heat exchange channels 31 to contact and exchange heat with all battery cells 210, thereby improving the temperature uniformity among battery cells 210.

[0121] Meanwhile, if the heat exchange channel in the relevant 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 channel section extending along the length of the housing needs to extend from one end of the housing to the other. The extension distance of this channel section is relatively long. When the heat exchange medium flows from one end to the other 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 will also be large.

[0122] 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.

[0123] 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 between the battery cells 210.

[0124] like Figure 5 As shown, each heat exchange channel 31 includes an extension 41 and a bend 42. Specifically, each heat exchange channel 31 may have one or more extensions 41, and multiple heat exchange channels 31 may have multiple extensions 41. Only a portion of the multiple extensions 41 of the multiple heat exchange channels 31 may extend along the first direction X, or all the extensions 41 of the multiple heat exchange channels 31 may extend along the first direction X. The bend 42 extends in a reciprocating bend along the second direction Y. For example, the bend 42 may extend in a meandering manner in the second direction Y, forming an S-shape, V-shape, or U-shape.

[0125] The extension 41 is disposed on the outside of the bend 42 in the first plane. That is, the extension 41 and the bend 42 are disposed in the same plane, and the extension 41 is disposed around the bend 42 to surround the bend 42. The extension 41 may surround part of the bend 42 or it may completely surround the bend 42. For example, the extension 41 extending along the first direction X may be respectively arranged on both sides of the bend 42 in the second direction Y to surround the bend 42 from both sides in the second direction Y.

[0126] The bending portion 42 extends by bending back and forth, which not only increases the extension length of the bending portion 42 and extends the flow path of the heat exchange medium to improve the heat exchange efficiency, but also increases the arrangement density of the heat exchange channels 31 and improves the temperature uniformity among the battery cells 210.

[0127] The extension 41 is disposed on the outside of the bend 42. Therefore, the extension 41 is located closer to the edge of the housing 100 than the bend 42. The edge of the housing 100 refers to the position where the housing 100 meets the external environment, and the edge of the housing 100 is closer to the external environment than other parts of the housing 100. In this way, the extension 41 can exchange heat with the outer battery cells 210 located closer to the edge of the housing 100, and the bend 42 can exchange heat with the battery cells 210 located closer to the center of the housing 100.

[0128] 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, leading to a gradual decrease in heat exchange efficiency. 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. Furthermore, the outer battery cells 210 near the edge of the housing 100 are closer to the external environment than the inner battery cells 210. Therefore, the outer battery cells 210 near the edge of the housing 100 experience more heat exchange with the external environment and dissipate heat more quickly than the inner battery cells 210 near the center of the housing 100.

[0129] 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 extension 41 of the heat exchange channel 31 and then flow to the bend 42 of the heat exchange channel 31. Alternatively, the heat exchange medium can first enter the bend 42 of the heat exchange channel 31 and then flow to the extension 41. When the heat exchange medium first enters the bending section 42 and then flows to the extension section 41, it can first cool the internal battery cells 210 located near the middle of the housing 100 in the bending section 42, and then enter the extension section 41 to cool the peripheral battery cells 210 located near the edge of the housing 100. Since the peripheral battery cells 210 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 bending section 42 can better meet the heat dissipation requirements of the battery cells 210 located in the middle of the housing 100. Simultaneously, because... The outer battery cells 210 near the edge of the housing 100 can directly dissipate heat naturally towards the external environment. When the temperature of the heat exchange medium in the extension 41 is slightly higher, it can still meet the heat dissipation requirements of the outer battery cells 210. This makes the cooling 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 roughly the same. As a result, the temperature 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 after cooling is more consistent, reducing the internal and external temperature difference between the battery cells 210 caused by heat dissipation to the environment, and making the temperature distribution inside the battery device 1000 more uniform.

[0130] 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 extension 41 of the heat exchange channel 31 and then flow to the bend 42 of the heat exchange channel 31. Alternatively, the heat exchange medium can first enter the bend 42 of the heat exchange channel 31 and then flow to the extension 41. For example, when the heat exchange medium flows from the extension 41 to the bend 42, the heat exchange medium can first heat the outer battery cells 210 near the edge of the housing 100 in the extension 41, and then enter the bend 42 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 cell 210 near the middle of the housing 100 has a small contact area with the external environment, resulting in less heat loss. The slightly lower temperature heat exchange medium flowing in the bend 42 can effectively meet the heating needs of the battery cell 210 in conjunction with the heat generated by the battery cell itself. 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 middle 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 middle 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.

[0131] In addition, the extension 41, which is attached to the outside of the bend 42, can also compact the arrangement of multiple heat exchange channels 31, allowing more or longer heat exchange channels 31 to be arranged in the same area, thereby improving the heating and cooling rate of the battery cell 210.

[0132] In the above technical solution, since the heat exchange channel 31 is formed with a channel body 311, and the channel bodies 311 of at least two heat exchange channels 31 are arranged along the length direction of the battery device 1000, different channel bodies 311 can exchange heat with different regions of the battery device 1000 in the length direction, thereby reducing the temperature difference between battery cells 210 at different positions in the length direction of the battery device 1000 and improving the temperature uniformity of the battery device 1000 in the length direction. Meanwhile, since the heat exchange channel 31 includes an extension 41 and a bend 42, and the extension 41 is located on the outside of the bend 42, the extension 41 can exchange heat with the peripheral battery cells 210 near the edge of the housing 100 among the multiple battery cells 210, and the bend 42 can exchange heat with the battery cells 210 near the middle of the housing 100. When the heat exchange medium flows into the extension 41 and the bend 42 in sequence, it can compensate for the temperature difference between the peripheral 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 peripheral 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.

[0133] In some embodiments of this application, such as Figure 5 As shown, the extensions 41 of the multiple heat exchange channels 31 constitute four extension sections, which are arranged sequentially along the circumference of the heat exchange assembly 300. The four extension sections together cover the bends 42 of the multiple heat exchange channels 31.

[0134] One extension segment can be composed of one extension portion 41, or it can be composed of multiple extension portions 41. For example, one extension segment may include two extension portions 41, which can be connected or arranged at a certain interval. In addition, any one of the four extension segments can extend along a straight line, a curve, or a broken line.

[0135] In some examples, four extensions are connected end to end in the circumferential direction of the heat exchange assembly 300. The bends 42 cover the inside of the four extensions, so that the bends 42 can be completely covered inside the four extensions. At this time, the four extensions can exchange heat with all the peripheral battery cells 210 of the battery cell assembly 200 located near the edge of the housing 100, and the bends 42 of the multiple heat exchange channels 31 can exchange heat with the internal battery cells 210 near the middle of the housing 100.

[0136] When the battery device 1000 is in cooling mode, the heat exchange medium can first enter the bend 42 of each heat exchange channel through the inlet 3103 of the multiple heat exchange channels 31 to cool the internal battery cells 210 located near the middle of the housing 100, and then enter the four extension sections formed by the multiple heat exchange channels 31 to cool the peripheral battery cells 210 near the edge of the housing 100. Since the outer battery cells 210 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 outer battery cells 210 is better than that of the inner battery cells 210. Therefore, the lower temperature heat exchange medium in the bending section 42 can better meet the heat dissipation needs of the battery cells 210 in the middle of the housing 100. At the same time, since the outer battery cells 210 closer to the edge of the housing 100 can directly dissipate heat to the external environment, even when the temperature of the heat exchange medium in the four extension sections is slightly higher, it can still meet the heat dissipation needs of the outer battery cells 210. This makes the temperature of the outer battery cells 210 closer to the edge of the housing 100 and the battery cells 210 closer to the middle of the housing 100 more consistent after cooling, reducing the temperature difference between the inner and outer parts of the battery cells 210 caused by heat dissipation to the environment, and making the temperature distribution inside the battery device 1000 more uniform.

[0137] When the battery device 1000 is in heating mode, the heat exchange medium can first enter the four extension sections formed by the multiple heat exchange channels 31 through the inlet 3103 to heat the peripheral battery cells 210 near the edge of the housing 100. Then, it enters the bends 42 of the multiple heat exchange channels 31 to cool the internal battery cells 210 near the center of the housing 100. Since the peripheral 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 in the four extension sections first heats the peripheral battery cells 210 near the edge of the housing 100, which can increase the temperature of the peripheral battery cells 210 while compensating for the heat lost by the peripheral battery cells 210 near the edge of the housing 100, 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 bend 42 can effectively meet the heating needs of the battery cells 210 themselves, in conjunction with the heat generated by the battery cells 210 themselves. Therefore, the outer battery cells 210 near the edge of the housing 100 and the battery cells 210 near the center of the housing 100 can achieve a more consistent temperature after heating, reducing the temperature difference between the inner and outer parts of the battery cells 210 caused by heat dissipation to the environment, and making the temperature distribution within the battery device 1000 more uniform.

[0138] In the above technical solution, the extensions 41 of the multiple heat exchange channels 31 constitute four extension sections. The four extension sections are arranged sequentially along the circumference of the heat exchange assembly 300 and cover the bending portion 42. As a result, the structure of the heat exchange channel 31 can be further compacted, and the length of the heat exchange channel 31 in the circumference of the housing 100 can be extended to fit and exchange heat with the peripheral battery cells 210 near the edge of the housing 100, thereby improving the thermal management efficiency of the peripheral battery cells 210 and enhancing the temperature uniformity performance between the peripheral battery cells 210.

[0139] In some embodiments of this application, such as Figure 5 As shown, the four extension segments are the first extension segment 4a, the second extension segment 4b, the third extension segment 4c and the fourth extension segment 4d. The first extension segment 4a and the third extension segment 4c both extend along the first direction X and are arranged at intervals in the second direction Y. The second extension segment 4b and the fourth extension segment 4d both extend along the second direction Y and are arranged at intervals in the first direction X.

[0140] In some examples, the outer contour of the housing 100 is approximately cuboid, and the number of battery cell modules 200 is one or more. All battery cell modules 200 constitute the battery module of the battery device, and the outer contour of the battery module is also approximately cuboid. In this case, the cross-section of the housing 100 and the battery module parallel to the first plane is approximately rectangular. The first extension segment 4a and the third extension segment 4c both extend along the first direction X, and the first extension segment 4a and the third extension segment 4c are arranged parallel and spaced apart in the second direction Y. The first extension segment 4a and the third extension segment 4c are respectively arranged on the two sides of the battery module in the second direction Y. The second extension segment 4b and the fourth extension segment 4d both extend along the second direction Y, and the second extension segment 4b and the fourth extension segment 4d are arranged parallel and spaced apart in the first direction X. The second extension segment 4b and the fourth extension segment 4d are respectively arranged at both ends of the battery module in the first direction X.

[0141] Furthermore, the first extension segment 4a, the second extension segment 4b, the third extension segment 4c, and the fourth extension segment 4d are connected end-to-end in a rectangular ring within the first plane. The first extension segment 4a can be composed of two extension portions 41 extending along and spaced apart in the first direction X. A gap is formed between the two extension portions 41 of the first extension segment 4a in the rectangular ring formed by the first extension segment 4a, the second extension segment 4b, the third extension segment 4c, and the fourth extension segment 4d. The second extension segment 4b is composed of two extension portions 41 extending along and connected in the second direction Y. The third extension segment 4c is composed of one extension portion 41 extending along the first direction X. The fourth extension segment 4d is composed of one extension portion 41 extending along the second direction Y.

[0142] In the above technical solution, the first extension section 4a, the second extension section 4b, the third extension section 4c, and the fourth extension section 4d can enclose a rectangular frame structure, which can not only improve the overall integrity of the heat exchange component 300 and the structure of the heat exchange channel, but also increase the heat exchange area between the heat exchange component 300 and the battery cell component 200 and improve the heat exchange efficiency. Furthermore, the four extension sections can exchange heat with all the peripheral battery cells 210, thereby improving the heat exchange efficiency and temperature uniformity of the peripheral battery cells 210.

[0143] In some embodiments of this application, such as Figure 5 As shown, in the circumferential direction of the heat exchange assembly 300, two adjacent extensions 41 are connected or arranged at intervals.

[0144] In some examples, adjacent extensions 41 in the same heat exchange channel 31 are connected and interconnected to enhance the structural integrity of the heat exchange assembly 300 and improve the structural strength of the heat exchange.

[0145] In some examples, two adjacent extensions 41 of different heat exchange channels 31 can be connected and interconnected to further compact the structure of the multiple heat exchange channels 31 and improve the strength and rigidity of the heat exchange assembly 300.

[0146] In some examples, adjacent extensions 41 of different heat exchange channels 31 are arranged at intervals. This reduces interference between connected heat exchange channels 31, simplifies the structure of the heat exchange channels 31, and facilitates manufacturing.

[0147] In the above technical solution, the connection of two adjacent extensions 41 can enhance the integrity of the heat exchange assembly 300 and improve the structural strength of the heat exchange assembly 300. The spacing of two adjacent extensions 41 can reduce the mutual interference between adjacent heat exchange channels 31 and facilitate the processing and manufacturing of heat exchange channels 31.

[0148] In some embodiments of this application, such as Figure 5 As shown, each heat exchange channel 31 includes at least two extensions 41. The multiple extensions 41 of the heat exchange channel 31 are connected in sequence, and the two connected extensions 41 have different extension directions. The bend 42 is connected to the downstream or upstream side of the multiple extensions 41 in the fluid flow direction.

[0149] In other words, a heat exchange channel 31 may have two, three, four or five extensions 41, and multiple extensions 41 are connected in sequence. One of the extensions 41 located at both ends of the extension direction is connected to the bend 42.

[0150] For example, the first heat exchange channel 31a includes two extensions 41, which are arranged perpendicularly to each other and smoothly connected. The first extension 41 is arranged at the front end of the battery device 1000 and extends in the left-right direction. One end of the first extension 41 is formed as an inlet 3103 and the other end is connected to the second extension 41. The second extension 41 is arranged on one side of the battery device 1000 in the left-right direction and extends in the front-back direction. The bend 42 is connected to the end of the second extension 41 away from the first extension 41.

[0151] For example, the second heat exchange channel 31b includes four extensions 41. The first extension 41 is arranged at the front end of the battery device 1000 and extends in the left-right direction. One end of the first extension 41 forms the inlet of the second heat exchange channel 31b. The second extension 41 is arranged on the left side of the battery device 1000 and extends in the front-back direction. The third extension 41 is arranged at the rear end of the battery device 1000 and extends in the left-right direction, and is connected to the other end of the first extension 41 through the second extension 41. The fourth extension 41 is arranged on the right side of the battery device 1000 and extends in the front-back direction. The rear end of the fourth extension 41 is connected to the third extension 41, and the front end is connected to the bend 42.

[0152] When the heat exchange medium flows within the heat exchange channel 31, under low-temperature heating conditions, the heat exchange medium first flows through multiple extensions 41 sequentially, and then enters the bend 42. At this point, the slightly higher-temperature heat exchange medium can first exchange heat with the outer battery cells 210 near the edge of the housing 100 within the multiple extensions 41, and then the slightly lower-temperature heat exchange medium exchanges heat with the inner battery cells 210 within the bend 42. 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 in the extensions 41 first heats the outer battery cells 210 near the edge of the housing 100, which can raise their temperature 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 bend 42 can effectively meet the heating needs of the battery cells 210 themselves, in conjunction with the heat generated by the battery cells 210 themselves. As a result, the temperatures 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 are more consistent after heating, reducing the temperature difference between the inner and outer parts of the battery cells 210 caused by heat dissipation to the environment, and making the temperature distribution within the battery device 1000 more uniform.

[0153] Under high-temperature cooling conditions, the heat exchange medium can first flow into the bend 42 and then flow into multiple extensions 41 in sequence. At this time, the heat exchange medium with a slightly lower temperature can first exchange heat with the internal battery cell 210 in the bend 42, and then the heat exchange medium with a slightly higher temperature can enter the multiple extensions 41 to exchange heat with the outer battery cell 210 near the edge of the housing 100. Since the outer battery cells 210 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 outer battery cells 210 is better than that of the inner battery cells 210. Therefore, the lower temperature heat exchange medium in the bending section 42 can better meet the heat dissipation needs of the battery cells 210 in the middle of the housing 100. At the same time, since the outer battery cells 210 closer to the edge of the housing 100 can directly dissipate heat to the external environment, even when the temperature of the heat exchange medium in the extension section 41 is slightly higher, it can still meet the heat dissipation needs of the outer battery cells 210. This makes the temperature of the outer battery cells 210 closer to the edge of the housing 100 and the battery cells 210 closer to the middle of the housing 100 more consistent after cooling, reducing the temperature difference between the inner and outer parts of the battery cells 210 caused by heat dissipation to the environment, and making the temperature distribution within the battery device 1000 more uniform.

[0154] In the above technical solution, multiple extensions 41 of each heat exchange channel 31 are connected sequentially, and the bend 42 is connected to the downstream or upstream side of the multiple extensions 41 in the fluid flow direction. This not only facilitates the multiple extensions 41 of the multiple heat exchange channels 31 to cooperate and surround the bend 42, but also reduces the internal and external temperature difference between battery cells 210 caused by heat dissipation to the environment, and improves the temperature uniformity between the outer battery cells 210 and the inner battery cells 210 near the edge of the housing 100.

[0155] In some embodiments of this application, such as Figure 5 As shown, the flow channel body 311 includes two extensions 41 and one bend 42. The two extensions 41 are a first extension 41 and a second extension 41, respectively. The first extension 41 extends along the second direction Y, and the second extension 41 extends along the first direction X. The first extension 41, the second extension 41 and the bend 42 are connected in sequence. The bend 42 is arranged on the side of the two extensions 41 away from the edge of the housing 100.

[0156] In some examples, the first extension 41 and the second extension 41 can be connected in an L-shape, and the connection position of the first extension 41 and the second extension 41 is bent into a quarter-circle shape. The bent portion 42 extends back and forth in the second direction Y. One end of the bent portion 42 is connected to the end of the second extension 41 that is away from the first extension 41, and the other end extends toward the first extension 41.

[0157] The bent portion 42, at one end connected to the second extension 41, defines a U-shaped region with the first extension 41 and the second extension 41, and the remaining portion of the bent portion 42 is arranged within the U-shaped region.

[0158] The bending portion 42 bends and extends, and is arranged inside the two extension portions 41. The bending portion 42 can increase the extension length of the flow channel body 311, increase the heat exchange time and heat exchange area between the heat exchange medium and the battery cell 210 in the bending portion 42, and improve the heat exchange effect.

[0159] The second extension 41 is bent and connected to the bending portion 42. For example, the connection position between the second extension 41 and the bending portion 42 can be bent into an arc and / or a zigzag shape. As a result, the structure of the flow channel body 311 can be compacted, and the arrangement density of the flow channels in the flow channel body 311 can be increased.

[0160] The bend 42 is connected to the upstream or downstream side of the two extensions 41 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 flow into the first extension, the second extension and the bend 42 in sequence, or the heat exchange medium can flow into the bend, the second extension and the first extension in sequence.

[0161] 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 bend 42 to the two extensions 41. 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 in the bend 42, and then cools the battery cell 210 at the periphery of the heat exchange area corresponding to the flow channel body 311 in the two extensions 41. Because the battery cells 210 at the periphery of the heat exchange area are located closer to the edge of the housing 100 than the battery cells 210 at the center 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 bend 42 can better meet the heat dissipation needs of the battery cells 210 at the center of the heat exchange area corresponding to the flow channel body 311. At the same time, because the battery cells 210 at the periphery of the heat exchange area can naturally dissipate more heat to the environment than the battery cells 210 at the center, the slightly higher temperature of the heat exchange medium in the two extensions 41 can still meet the heat dissipation needs of the battery cells 210 at the periphery of the heat exchange area corresponding to the flow channel body 311. As a result, the cooling effect and temperature of the battery cells 210 at the periphery and center of the heat exchange area corresponding to the flow channel body 311 are roughly the same, improving the temperature uniformity among the battery cells 210 in the heat exchange area corresponding to the flow channel body 311.

[0162] 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 two extensions 41 into the bend 42. At this time, the heat exchange medium with a higher temperature first flows into the two extensions 41 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 bend 42 to heat the battery cell 210 at the middle position of the heat exchange area corresponding to the flow channel body 311. Among them, 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 two extensions 41 can not only be used to 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 body of the flow channel 311 dissipates less heat to the external environment of the housing 100. The heat exchange medium with a slightly lower temperature inside the bend 42 can also well meet the heating requirements of the battery cell 210 in the middle of the heat exchange area corresponding to the main body of the flow channel 311. As a result, 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 receive roughly the same heating effect and the temperature tends to be consistent, thereby improving the temperature uniformity among the battery cells 210 in the heat exchange area corresponding to the main body of the flow channel 311.

[0163] In the above technical solution, since the two extensions 41 of the flow channel body 311 are bent and connected, and the bent part 42 is bent and arranged inside the two extensions 41, 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.

[0164] In some embodiments of this application, such as Figure 5 As shown, the bending portion 42 includes a plurality of horizontal portions 3101. The plurality of horizontal portions 3101 extend along the second direction Y and are arranged at intervals along the first direction X. The second direction Y is the width direction of the battery device 1000. The plurality of horizontal portions 3101 of the bending portion 42 are sequentially bent and connected along the first direction X.

[0165] The bending portion 42 may include two, three, four, five or more horizontal portions 3101.

[0166] 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.

[0167] In the above technical solution, the bending portion 42 includes multiple horizontal portions 3101. The multiple horizontal portions 3101 can increase the heat exchange area of ​​the bending portion 42, improve the heat exchange efficiency, make the heat of the bending portion 42 evenly distributed, and improve the temperature uniformity between battery cells 210. In addition, the multiple horizontal portions 3101 are bent and connected in sequence, which can simplify the structure of the bending portion 42 and facilitate the processing and forming of the bending portion 42.

[0168] In some embodiments of this application, such as Figure 5 As shown, the connection position of the two adjacent horizontal parts 3101 of the bent part 42 is bent into a semi-circular arc.

[0169] For example, the bending portion 42 includes a plurality of horizontal portions 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 portions 3101 can be set according to the heat exchange requirements of the battery cell 210. The plurality of horizontal portions 3101 are sequentially bent and connected, and the bending position is a semi-circular arc shape away from the protrusion of the horizontal portions 3101 in the second direction Y.

[0170] 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.

[0171] In the above technical solution, the connection position of the two horizontal parts 3101 of the bent part 42 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 bent part 42 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 bent part 42, and reduces stress concentration at the bending position, thus extending the service life of the heat exchange component 300.

[0172] In some embodiments of this application, such as Figure 5 As shown, the connection between the first extension 41 and the second extension 41 is bent into a quarter-circle shape, and the connection between the second extension 41 and the bent portion 42 is bent into a quarter-circle shape.

[0173] In the above technical solution, the connection points between the first extension 41 and the second extension 41, and between the second extension 41 and the bent portion 42, are both bent into quarter-circle arc shapes. 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 component 300. Furthermore, it facilitates the processing and forming of the flow channel body 311, reducing the risk of leakage at the connection points.

[0174] In some embodiments of this application, such as Figure 5 and Figure 6 As shown, the inlet 3103 and outlet 3104 of the multiple heat exchange channels 31 are all located at the same end of the battery device 1000 in the first direction X.

[0175] 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.

[0176] 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.

[0177] 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.

[0178] 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.

[0179] 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.

[0180] In the above technical solution, 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 allows the inlets 3103 and outlets 3104 of multiple heat exchange channels 31 to 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 space required for the arrangement of inlets 3103, outlets 3104, and external pipes, resulting in a compact structure, reduced space occupation, and improved space utilization. Furthermore, it can improve the temperature uniformity among the battery cells 210 corresponding to each heat exchange channel 31, and improve the temperature uniformity between battery cells 210 at the edge of the housing 100 and those near the center of the housing 100, reducing the probability of localized overheating or underheating in the battery device 1000 and improving the temperature uniformity performance of the battery device 1000.

[0181] In some embodiments of this application, such as Figure 5 and Figure 6As shown, the inlets 3103 of multiple heat exchange channels 31 are all connected, and the outlets 3104 of multiple heat exchange channels 31 are all connected.

[0182] 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.

[0183] 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.

[0184] 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.

[0185] In some embodiments of this application, such as Figure 5 and Figure 6 As shown, the multiple heat exchange channels 31 include 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 second heat exchange channel 31b further includes a first connecting portion 312 and a second connecting portion 313. The first connecting portion 312, the main body 311 and the second connecting portion 313 are connected in sequence. The end of the first connecting portion 312 away from the main body 311 forms the inlet 3103, and the end of the second connecting portion 313 away from the main body 311 forms the outlet 3104. The first connecting portion 312 and the second connecting portion 313 both extend along the first direction X.

[0186] 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 channel bodies 311 of the multiple second heat exchange channels 31b are arranged sequentially along the first direction X.

[0187] 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.

[0188] 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.

[0189] 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.

[0190] 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.

[0191] In some specific examples, the first connecting portion 312 includes two extensions 41 connected in an L-shape. One of the two extensions 41 extends along a first direction X and the other extends along a second direction Y. One end of the extension 41 extending along the first direction X is connected to one end of the channel body 311 of the second heat exchange channel 31b, and one end of the extension 41 extending along the second direction Y forms the inlet 3103 of the second heat exchange channel 31b.

[0192] In some specific examples, the second connecting portion 313 includes a horizontal portion 3101 and a vertical portion. One end of the vertical portion 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 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 is connected to the other end of the vertical portion 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 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 of the second connecting portion 313 is bent into a quarter-circle arc shape.

[0193] 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.

[0194] 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.

[0195] 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.

[0196] When the battery device 1000 is in a low-temperature heating condition, the higher-temperature heat exchange medium can first enter the first connecting part 312 from the inlet 3103. Since the battery cell 210 corresponding to the first connecting part 312 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 in the first connecting part 312 can not only raise the temperature of the battery cell 210 near the edge of the housing 100, but also compensate for the temperature drop of the battery cell 210 near the edge of the housing 100. The heat lost to the external environment is used to meet the heating needs. As a result, the temperature difference between the outer battery cells 210 that are close to the edge of the housing 100 and in contact with the first connecting part 312 for heat exchange and the battery cells 210 that are close to the middle of the housing 100 (such as the battery cells 210 that are heat exchanged corresponding to the flow body 311 of the first heat exchange flow channel 31a and the battery cells 210 that are heat exchanged corresponding to the flow body 311 of the second heat exchange flow channel 31b) can be reduced, thereby improving the temperature uniformity among the battery cells 210.

[0197] 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, regarding the second connecting portion 313, since the second connecting portion 313 is located closer to the edge of the housing 100 than the flow channel body 311 of the first heat exchange flow channel 31a, the battery cell 210 corresponding to the second connecting portion 313 and in contact with the flow channel body 311 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 portion 313 can still meet the heat dissipation requirements of the corresponding battery cell 210 near the edge of the housing 100. Therefore, the temperature difference between the battery cell 210 near the edge of the housing 100 and in contact with the second connecting portion 313 and the battery cell 210 near the middle of the housing 100 (such as the battery cell 210 corresponding to the flow channel body 311 of the first heat exchange flow channel 31a and the battery cell 210 corresponding to the flow channel body 311 of the second heat exchange flow channel 31b) can be reduced, thereby improving the temperature uniformity among the battery cells 210.

[0198] 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.

[0199] 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.

[0200] In some embodiments of this application, such as Figure 5 and Figure 6 As shown, the first connecting part 312 is closer to the edge of the housing 100 in the second direction Y than the second connecting part 313.

[0201] 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.

[0202] 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.

[0203] 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.

[0204] Because the first connecting portion 312 is located closer to the edge of the housing 100, it can exchange heat with the battery cells 210 closer to the edge of the housing 100. Furthermore, since one end of the first connecting portion 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 portion 312, then flows into the channel body 311, and finally into the second connecting portion 313. Therefore, under low-temperature heating conditions, the temperature of the heat exchange channel 31 within the first connecting portion 312 is higher, and the battery cells 210 exchanging heat with the first connecting portion 312 exchange more heat with the environment. Thus, the high-temperature fluid within the first connecting portion 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.

[0205] 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.

[0206] In some embodiments of this application, such as Figure 5 and Figure 6 As shown, 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.

[0207] For example, in the second direction Y, which is the left-right direction, 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 both can 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. Therefore, the heat exchange temperature obtained in this heat exchange area is approximately the average temperature of the first connecting part 312 and the second connecting part 313. This reduces the probability of localized overheating or underheating within the battery device 1000 and improves the temperature uniformity among the battery cells 210.

[0208] 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.

[0209] In some embodiments of this application, such as Figure 5 As shown, the connection position between the first connecting part 312 and the flow channel body 311 is bent into a quarter-circle arc shape; and / or, the connection position between the second connecting part 313 and the flow channel body 311 is bent into a quarter-circle arc shape.

[0210] 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.

[0211] In some embodiments of this application, such as Figure 5 and Figure 6 As shown, the first connecting part 312 is in contact with the outermost battery cell 210 arranged in the second direction Y in the battery cell assembly 200 for heat exchange.

[0212] Multiple battery cells 210 are stacked along a second direction Y to form a row of battery cells 210, where the second direction Y is the thickness direction of the battery cells 210. Multiple rows of battery cells 210 are arranged along a first direction X to form a battery cell assembly 200. The first connecting portion 312 and the second connecting portion 313 both extend in a straight line along the first direction X, and the first connecting portion 312 and the second connecting portion 313 are arranged parallel to each other and spaced apart along the second direction Y. Among them, one or more battery cells 210 on the outermost side of the first connecting portion 312 in the second direction Y are in contact for heat exchange.

[0213] When the width of the first connecting portion 312 in the second direction Y is greater than the thickness of the battery cell 210, the first connecting portion 312 can be in contact with at least two outermost layers of battery cells 210 in the second direction Y for heat exchange. When the width of the first connecting portion 312 in the second direction Y is less than or equal to the thickness of the battery cell 210, the first connecting portion 312 can be in contact with one or two outermost layers of battery cells 210 in the second direction Y for heat exchange.

[0214] In some examples, the length of the first connection portion 312 in the second direction Y is greater than or equal to the total length of the plurality of battery cell assemblies 200 in the first direction X. This allows each outermost battery cell 210 of the plurality of battery cell assemblies 200 in the second direction Y to exchange heat with the first connection portion 312, thereby improving temperature uniformity.

[0215] In the above technical solution, the first connecting part 312 is in contact with the outermost battery cell 210 in the second direction Y for heat exchange, which can increase the contact area between the outermost battery cell 210 in the second direction Y and the heat exchange channel 31, improve the heat exchange efficiency of the outermost battery cell 210 in the second direction Y, balance the internal and external temperature difference between battery cells 210 caused by ambient temperature, and thus improve the temperature uniformity between battery cells 210.

[0216] In some embodiments of this application, such as Figure 5 and Figure 6 As shown, the distance between the first connecting portion 312 and the second connecting portion 313 in the second direction Y is less than the thickness of the battery cell 210 in the second direction Y.

[0217] In the above technical solution, since the distance between the first connecting part 312 and the second connecting part 313 in the second direction Y is less than the thickness of the battery cell 210 in the second direction Y, the first connecting part 312 can exchange heat with the outermost battery cell 210 in the second direction Y, and the second connecting part 313 can exchange heat with the battery cell 210 adjacent to the first connecting part 312. This allows each battery cell 210 to fit and exchange heat with the heat exchange channel 31, avoiding the situation where the battery cell 210 between the first connecting part 312 and the second connecting part 313 cannot exchange heat with either the first connecting part 312 or the second connecting part 313, thereby improving the temperature uniformity among the battery cells 210.

[0218] In some embodiments of this application, such as Figure 5 As shown, 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. The ratio of the extension lengths of any two heat exchange channels 31 is 0.8-1.2.

[0219] 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.

[0220] 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.

[0221] 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.

[0222] In some embodiments of this application, such as Figure 5 and Figure 6 As shown, there are two heat exchange channels 31, namely the first heat exchange channel 31a and the 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.

[0223] For example, the first direction X is the front-rear direction of the battery device 1000. The heat exchange assembly 300 has two heat exchange channels 31. The inlet 3103 and outlet 3104 of the two heat exchange channels 31 are both 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, respectively. 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.

[0224] 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.

[0225] 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.

[0226] 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.

[0227] 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.

[0228] 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.

[0229] In some embodiments of this application, such as Figure 6 and Figure 7 As shown, the battery cell assembly 200 includes multiple rows of battery cells 210. Multiple battery cells 210 are stacked in a row along the second direction Y. 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 angles to each other.

[0230] For example Figure 7 As shown, the battery device 1000 includes a plurality of battery cell assemblies 200. Each battery cell assembly 200 may include 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. The plurality of 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.

[0231] 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.

[0232] 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.

[0233] 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.

[0234] 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.

[0235] Furthermore, the heat exchange assembly 300 is arranged on one side of the battery cell assembly 200 in the third direction Z, or the heat exchange assembly 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 assembly 300 can be arranged on the upper or lower side of the battery cell assembly 200, or on both the upper and lower sides of the battery cell assembly 200. Through heat exchange between the heat exchange assembly 300 and the multiple battery cells 210 of the battery cell assembly 200, the multiple battery cells 210 can be made to operate within a suitable temperature range, thereby improving the reliability, stability and service life of the battery device 1000.

[0236] The heat exchange assembly 300 has a plurality of heat exchange channels 31. For example, the heat exchange assembly 300 includes a plurality of heat exchange tubes 30, each heat exchange tube 30 being bent and extended and defining a heat exchange channel 31 on its inner side. Each heat exchange channel 31 has a channel body 311, and the channel bodies 311 of the plurality of heat exchange channels 31 are arranged sequentially along a first direction X.

[0237] 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.

[0238] 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.

[0239] 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.

[0240] 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.

[0241] 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.

[0242] In some embodiments of this application, such as Figure 6 As shown, the width of the heat exchange channel 31 is the first width H1, and the dimension of the battery cell 210 in the first direction X is the second width H2. The ratio of the first width H1 to the second width H2 is greater than or equal to one-third.

[0243] 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.

[0244] 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.

[0245] 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.

[0246] 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.

[0247] In some embodiments of this application, such as Figure 6 and Figure 7 As shown, 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. 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.

[0248] 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.

[0249] 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.

[0250] 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.

[0251] 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.

[0252] In some examples, the shape of the heat exchange tube 30 can be varied, for example, it can be a circular tube, a flat tube, etc.

[0253] In some examples, the number of heat exchange tubes 30 can be two, three, four or more, and the number of heat exchange tubes 30 can be designed according to the number and size of the battery cells 210.

[0254] Furthermore, multiple heat exchange tubes 30 are arranged in parallel. For example, the inlets 3103 of multiple heat exchange tubes 30 are all connected to the distribution chamber of the heat exchange assembly 300, and the outlets 3104 of multiple heat exchange tubes 30 are all connected to the confluence chamber of the heat exchange assembly 300.

[0255] 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.

[0256] 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.

[0257] 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.

[0258] 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.

[0259] 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.

[0260] 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.

[0261] 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.

[0262] 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.

[0263] In some embodiments of this application, such as Figure 7As shown, 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. The battery cell 210 is disposed in the receiving cavity.

[0264] 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.

[0265] 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.

[0266] 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.

[0267] 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.

[0268] 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.

[0269] In some embodiments of this application, such as Figure 7 As shown, the housing 100 also includes: mounting beams 130, which are disposed in the receiving cavity, extend along the first direction X and are arranged on both sides of the bottom plate 110 in the second direction Y, and the battery cell assembly 200 is disposed between the two mounting beams 130.

[0270] 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.

[0271] 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.

[0272] 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.

[0273] 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.

[0274] In some embodiments of this application, such as Figure 7 As shown, the heat exchange component 300 is located inside the housing 100.

[0275] 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.

[0276] 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.

[0277] In some embodiments of this application, such as Figure 5 and Figure 7 As shown, 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. The bottom plate 110 of the housing 100 has a plurality of ribs 111, which cooperate to define a bent and extended receiving groove 112, in which the heat exchange tubes 30 are arranged.

[0278] For example, the number of raised ribs 111 on the base plate 110 can be four, eight, ten, twelve, fifteen or more, etc.

[0279] 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.

[0280] like Figure 7As shown, 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.

[0281] 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.

[0282] 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.

[0283] In some embodiments of this application, 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. 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.

[0284] In the above technical solution, the length-to-width ratio of the housing 100 is greater than 2, which can make the battery device 1000 have a narrower width, reduce the space occupied in the width direction, and facilitate the assembly of the battery device 1000.

[0285] In some embodiments of this application, 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.

[0286] 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.

[0287] 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.

[0288] In some embodiments of this application, reference is made to Figure 2 and Figure 7 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, and the third direction Z intersects with the first direction X.

[0289] For example, the thickness of the enclosure 100 can be 20mm, 25mm, 30mm, 35mm, 40mm, 45mm or 50mm, etc.

[0290] 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.

[0291] Secondly, embodiments of this application also provide an electrical device 1, including the battery device 1000 of any of the above embodiments.

[0292] In the above technical solution, since the power-consuming device 1 is equipped with the battery device 1000, and the heat exchange components 300 have multiple heat exchange channels 31 each having a channel body 311, with at least two heat exchange channels 31 having their channel bodies 311 arranged along the length of the battery device 1000, different channel bodies 311 can exchange heat with different regions of the battery device 1000 along the length, thereby reducing the temperature difference between battery cells 210 at different positions along the length of the battery device 1000 and increasing the overall temperature of the battery device 1000 along the length. Uniformity is improved. Meanwhile, since the heat exchange channel 31 includes an extension 41 and a bend 42, and the extension 41 is disposed on the outside of the bend 42, the extension 41 can block other debris or impurities from entering the inside of the extension 41. It can also exchange heat with the battery cells 210 closer to the edge of the housing 100, thereby improving the thermal management efficiency of the battery cells 210 at the edge of the housing 100. It can also make the structure of the heat exchange channel 31 more compact, increase the length of the heat exchange channel 31, and improve the heat exchange efficiency of the battery cell assembly 200, thereby improving the overall performance of the electrical device 1.

[0293] 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.

[0294] 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.

[0295] 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.

[0296] 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).

[0297] 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.

[0298] In the above technical solution, the length of the battery device 1000 is along the front-rear direction of the vehicle, which facilitates the placement of the battery device on the vehicle and makes the assembly of the battery device convenient.

[0299] The following will refer to Figures 1-7 Describes a vehicle according to a specific embodiment of this application.

[0300] Reference Figure 1 The vehicle includes a battery unit 1000, which is used to provide electrical energy to the vehicle.

[0301] Specifically, such as Figures 1-4 As shown, 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 a mounting plate 113 extending upward is provided along the front edge of the bottom plate 110. The top cover 120 is box-shaped with its lower side open. An clearance opening adapted to the shape of the mounting plate 113 is formed on the front edge of the top cover 120. 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.

[0302] 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.

[0303] 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.

[0304] 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.

[0305] like Figures 4-6 As shown, 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 flow channel 31 are arranged on the front side of the battery device 1000.

[0306] Each heat exchange channel 31 includes an extension 41 and a bend 42. The number of extensions 41 in each heat exchange channel 31 is multiple and sequentially bent and connected. Adjacent extensions 41 of the same heat exchange channel 31 are arranged perpendicularly to each other. The extensions 41 of the multiple heat exchange channels 31 constitute four extension segments, namely a first extension segment 4a, a second extension segment 4b, a third extension segment 4c, and a fourth extension segment connected end-to-end. The first extension segment 4a and the third extension segment 4c extend along a first direction X and are arranged parallel and spaced apart in a second direction Y. The second extension segment 4b and the fourth extension segment 4d extend along the second direction Y and are arranged parallel and spaced apart in the first direction X. The bends 42 of the multiple heat exchange channels 31 are all arranged within the rectangular area enclosed by the first extension segment 4a, the second extension segment 4b, the third extension segment 4c, and the fourth extension segment. The bend 42 includes multiple horizontal portions 3101 extending horizontally and spaced apart in the front-back direction, and sequentially bent and connected.

[0307] In some specific examples, 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 includes two extensions 41 and a bend 42, and the two extensions 41 and the bend 42 together constitute the channel body 311 of the first heat exchange channel 31a and are arranged in front of the channel body 311 of the second heat exchange channel 31b.

[0308] 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 one side of the first heat exchange channel 31a in the second direction Y.

[0309] 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.

[0310] 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.

[0311] 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.

[0312] 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.

[0313] 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), characterized in that, include: 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) includes a plurality of heat exchange channels (31), at least a portion of each heat exchange channel (31) being formed as a channel body (311), the channel bodies (311) of at least two heat exchange channels (31) being arranged along a first direction (X), each heat exchange channel (31) including an extension (41) and a bend (42), at least a portion of the extension (41) of the plurality of heat exchange channels (31) extending along the first direction (X), the bend... The portion (42) extends in a reciprocating bend in the second direction (Y), and the extension portion (41) is disposed on the outside of the bend portion (42) in a first plane; wherein the first direction (X) and the second direction (Y) are both located in the first plane, and the heat exchange assembly (300) is arranged on at least one side of the battery cell assembly (200) in a third direction (Z) for heat exchange with the battery cell (210), wherein the first direction (X), the second direction (Y) and the third direction (Z) intersect each other.

2. The battery device (1000) according to claim 1, characterized in that, The extensions (41) of the plurality of heat exchange channels (31) constitute four extension sections, which are arranged sequentially along the circumference of the heat exchange assembly (300), and the four extension sections together cover the bends (42) of the plurality of heat exchange channels (31).

3. The battery device (1000) according to claim 2, characterized in that, The four extension segments are a first extension segment (4a), a second extension segment (4b), a third extension segment (4c), and a fourth extension segment (4d). The first extension segment (4a) and the third extension segment (4c) extend along the first direction (X) and are spaced apart in the second direction (Y). The second extension segment (4b) and the fourth extension segment (4d) extend along the second direction (Y) and are spaced apart in the first direction (X).

4. The battery device (1000) according to claim 1, characterized in that, In the circumferential direction of the heat exchange assembly (300), two adjacent extensions (41) are connected or spaced apart.

5. The battery device (1000) according to claim 1, characterized in that, Each heat exchange channel (31) includes at least two extensions (41), and the multiple extensions (41) of the heat exchange channel (31) are connected in sequence, and the two connected extensions (41) have different extension directions. The bend (42) is connected to the downstream or upstream side of the multiple extensions (41) in the fluid flow direction.

6. The battery device (1000) according to claim 1, characterized in that, The main body of the flow channel (311) includes two extensions (41) and one bend (42). The two extensions (41) are a first extension (41) and a second extension (41), respectively. The first extension (41) extends along the second direction (Y) and the second extension (41) extends along the first direction (X). The first extension (41), the second extension (41) and the bend (42) are connected in sequence. The bend (42) is arranged on the side of the two extensions (41) away from the edge of the box body (100).

7. The battery device (1000) according to claim 6, characterized in that, The bending portion (42) includes a plurality of horizontal portions (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 portions (3101) of the bending portion (42) are sequentially bent and connected along the first direction (X).

8. The battery device (1000) according to claim 7, characterized in that, The connection point between two adjacent horizontal sections (3101) is bent into a semi-circular arc shape.

9. The battery device (1000) according to claim 6, characterized in that, The connection between the first extension (41) and the second extension (41) is bent into a quarter-circle arc shape, and the connection between the second extension (41) and the bent portion (42) is bent into a quarter-circle arc shape.

10. The battery device (1000) according to claim 1, characterized in that, The inlets (3103) and outlets (3104) of the plurality of heat exchange channels (31) are all located at the same end of the battery device (1000) in the first direction (X).

11. The battery device (1000) according to claim 10, characterized in that, 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.

12. The battery device (1000) according to claim 10, characterized in that, 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, characterized in that, 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).

14. The battery device (1000) according to claim 12, characterized in that, 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 claim 14, characterized in that, The first connecting portion (312) is in contact with the outermost battery cell (210) arranged in the second direction (Y) of the battery cell assembly (200) for heat exchange.

16. The battery device (1000) according to claim 14, characterized in that, The distance between the first connecting portion (312) and the second connecting portion (313) in the second direction (Y) is less than the thickness of the battery cell (210) in the second direction (Y).

17. The battery device (1000) according to claim 1, characterized in that, Each of the heat exchange channels (31) has an inlet (3103) and an outlet (3104), and each of the heat exchange channels (31) extends from the inlet (3103) to the outlet (3104), wherein the ratio of the extension lengths of any two of the heat exchange channels (31) is 0.8-1.

2.

18. The battery device (1000) according to claim 1, characterized in that, The battery cell assembly (200) includes 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 number of battery cell assemblies (200) is multiple, and the multiple battery cell assemblies (200) are arranged sequentially along the first direction (X).

19. The battery device (1000) according to claim 18, characterized in that, 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.

20. The battery device (1000) according to claim 1, characterized in that, 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.

21. The battery device (1000) according to claim 1, characterized in that, The heat exchange component (300) is located inside the housing (100).

22. The battery device (1000) according to claim 21, characterized in that, The heat exchange assembly (300) includes a heat exchange tube (30) that defines the heat exchange channel (31). The bottom plate (110) of the housing (100) has a plurality of ribs (111) that cooperate to define a bent and extended receiving groove (112). The heat exchange tube (30) is arranged in the receiving groove (112).

23. An electrical device (1), characterized in that, The battery device (1000) includes any one of claims 1-22.

24. The electrical appliance (1) according to claim 23, characterized in that, 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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