Battery device, energy storage device, energy storage system and charging network

Abstract

The application provides a battery device, an energy storage device, an energy storage system and a charging network. The battery device comprises: a battery assembly comprising at least two battery monomers; a heat exchange assembly comprising at least two heat exchange regions arranged in parallel along a first direction; the battery assembly is arranged on the heat exchange assembly and covers the at least two heat exchange regions; the heat exchange region comprises a first port and a heat exchange flow channel connected to each other; and the heat exchange flow channel is arranged around the periphery of the first port. The battery device can reduce the temperature difference between different regions of the battery assembly; the flow resistance in the heat exchange flow channel is relatively small, thereby reducing the amount of cooling liquid, the flow of the liquid supply assembly and the power consumption, and reducing the cost of the battery device.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery device, energy storage device, energy storage system and charging network. Background Technology

[0002] In recent years, battery devices have been widely used in energy storage power systems such as hydropower, thermal power, wind power and solar power plants, as well as in many fields such as power tools, electric bicycles, electric motorcycles, electric cars, and aerospace.

[0003] The battery device includes a battery module, which comprises multiple battery cells. The temperature of battery cells located in the central region of the battery module is typically higher, while the temperature of battery cells located at the edges of the battery module is typically lower. This results in a significant temperature difference between the battery cells in different regions of the battery module, affecting the performance of the battery module.

[0004] Therefore, how to reduce the temperature difference between different areas of the battery module is a technical problem that urgently needs to be solved in battery technology. Utility Model Content

[0005] The battery device, energy storage device, energy storage system, and charging network provided in this application are intended to solve the temperature difference problem in different regions of existing battery modules.

[0006] To solve the above-mentioned technical problems, one technical solution adopted in this application is to provide a battery device. The battery device includes a battery assembly and a heat exchange assembly. The battery assembly includes at least two individual battery cells. The heat exchange assembly includes at least two heat exchange regions arranged in parallel along a first direction; the battery assembly is disposed on the heat exchange assembly and covers the at least two heat exchange regions; each heat exchange region includes a first connected port and a heat exchange channel; the heat exchange channel surrounds the periphery of the first port.

[0007] The aforementioned battery device allows coolant to enter through a first port. Since the coolant enters the heat exchange channel from the first port, its temperature is relatively low, enabling a significant cooling effect on the battery cells in the central region of the battery module. However, as the coolant flows, it exchanges heat with the battery cells, causing its temperature to gradually rise. Therefore, as the coolant flows through the heat exchange channel, its temperature gradually increases, and the cooling effect on the battery cells becomes smaller. For the unheated battery module, since the temperature of the battery cells in the central region is already higher than that of the cells in the edge regions, this solution can significantly cool the battery cells in the central region and only slightly cool the cells in the edge regions. This reduces the temperature difference between the battery cells in the central and edge regions, resulting in better temperature uniformity across the battery module and extending its lifespan. Furthermore, by including at least two heat exchange regions arranged in parallel along the first direction in the heat exchange assembly, the heat exchange channels of each heat exchange region are relatively shorter than those of a scheme that includes only one heat exchange region, which can reduce flow resistance; and the width of the heat exchange channels can be controlled within a certain range to reduce the total volume of the heat exchange channels, thereby reducing the amount of coolant used, the flow rate and power consumption of the liquid supply assembly, and the cost of the battery device. In one embodiment, the heat exchange channel includes a first main channel and a second main channel. The first main channel is connected to a first port and is arranged around the first port circumferentially at least two times. The second main channel is connected in series with the first main channel and is disposed on at least one side of the first main channel along a second direction, which intersects the first direction.

[0008] In the above scheme, the temperature of the battery cells in the central region is higher, requiring greater cooling, while the temperature of the battery cells in the edge region is relatively lower, requiring less cooling. Therefore, this scheme can both match the temperature change pattern of the coolant flowing in the first main channel to the temperature gradient change pattern from the central region to the edge region of the battery module, significantly reducing the temperature of each battery cell at the corresponding location, and also use the coolant flowing through the second main channel to provide a smaller cooling effect on the battery cells in the edge region, thereby reducing the temperature difference between battery cells in different regions.

[0009] In one embodiment, the second main channel includes a plurality of second branch channels arranged in parallel, each of which is connected to the first main channel and extends to the edge of the heat exchange assembly along the second direction.

[0010] Compared to the overall series design of the second main channel, the above scheme adopts a split design for the second main channel. The flow resistance of the second main channel is lower, which reduces the flow resistance of the entire heat exchange channel, reduces the energy loss of the coolant during the flow process and the power consumption of the power components that drive the coolant flow, and improves the uniformity of the coolant flow velocity in the entire heat exchange channel.

[0011] In one embodiment, the heat exchange channel further includes a third main channel; the third main channel is connected to the first port and is arranged around the first port in the circumferential direction at least two times; and the third main channel and the first main channel are nested together.

[0012] The above scheme, in addition to the first main flow channel, further adds a third main flow channel. This third main flow channel increases the heat exchange area between the heat exchange channels and the battery module, thereby improving the heat exchange efficiency and amplitude of the battery cells at the corresponding locations. Simultaneously, the distribution of the third main flow channel allows the temperature change pattern of the coolant flowing within it to match the temperature gradient pattern from the center region to the edge region of the battery module, significantly reducing the temperature of each battery cell at the corresponding location.

[0013] In one embodiment, the heat exchange channel further includes a fourth main channel, which includes a plurality of fourth branch channels arranged in parallel. The plurality of fourth branch channels are connected in series with the third main channel and extend to the edge of the heat exchange component respectively; wherein the fourth main channel and the second main channel are located on both sides of the first main channel along the second direction.

[0014] The above solution, by adding a fourth main flow channel, allows for a slight cooling of the battery cells located at the edges using the coolant flowing through this channel. Simultaneously, the fourth and second main flow channels can evenly distribute the temperature of the battery cells in the central region of the battery module along the second direction to both sides of the heat exchange module, improving the temperature uniformity between the central region and the edges of the battery module along the second direction. Furthermore, since the fourth main flow channel includes multiple parallel fourth branch channels, its flow resistance is low, further reducing the overall flow resistance of the heat exchange channel. This minimizes energy loss of the coolant during flow and the power consumption of the driving components, improving the uniformity of the coolant flow velocity throughout the heat exchange channel.

[0015] In one embodiment, the first port is located in the central region of the heat exchange channel.

[0016] The above solution is more conducive to the coolant entering through the first port carrying away the heat in the central area of ​​the battery module, so as to balance the temperature difference of the battery module.

[0017] In one embodiment, the second and / or fourth branch channels are arranged in a serpentine pattern. This increases the heat exchange area of ​​the second and / or fourth branch channels, thereby improving the heat exchange effect.

[0018] In one embodiment, the heat exchange assembly further includes a first water nozzle and a liquid distribution pipe; the liquid distribution pipe is connected to the first water nozzle, and the first ports are respectively connected to the liquid distribution pipe.

[0019] The above solution allows for the supply of liquid to each heat exchange zone using a single liquid supply component. This not only simplifies the product structure and saves costs, but also improves the heat exchange uniformity of each heat exchange zone and reduces the temperature difference between different areas of the battery module.

[0020] In one embodiment, the dispensing tube has a flow chamber and a plurality of connectors spaced apart. The flow chamber is connected to a first water tap. The plurality of connectors are respectively connected to the flow chamber and respectively connected to a first port.

[0021] The above solution allows the liquid separator to be directly connected to the first port without the need for additional adapters or connectors, simplifying the structural layout of the battery device, reducing product size, and lowering costs.

[0022] In one embodiment, a connector corresponds to a first port; the connector has a connecting hole, and the diameter of the connecting hole of each connector gradually increases in the direction away from the first water nozzle.

[0023] The above scheme can adjust the liquid flow rate at each first port by using different apertures of each connecting hole, so that the liquid flow rate flowing into each first port is basically the same, thereby improving the heat exchange uniformity of each heat exchange area and facilitating the uniform temperature of the battery assembly at each position along the first direction.

[0024] In one embodiment, the heat exchange assembly further includes a reversing mechanism configured to switch the flow direction of the heat exchange medium in the heat exchange channel, so that the heat exchange channel is either inlet to the first port or outlet from the first port.

[0025] The above solution can switch the flow direction of the heat exchange medium in the heat exchange channel according to actual needs, so that the heat exchange component can balance the temperature difference of the battery module in cooling mode as well as the temperature difference of the battery module in heating mode.

[0026] In one embodiment, the heat exchange assembly includes a first heat exchange plate and a second heat exchange plate. The second heat exchange plate cooperates with the first heat exchange plate to form a heat exchange channel; wherein, one of the first and second heat exchange plates is provided with a protrusion, and the other heat exchange plate is provided with a recess, and the protrusion and the recess engage with each other. This facilitates the assembly and positioning of the first and second heat exchange plates. In one embodiment, at least a portion of the first heat exchange plate is recessed in a direction away from the second heat exchange plate to form a first heat exchange groove, and the second heat exchange plate is disposed on the first heat exchange plate and cooperates with the first heat exchange groove to form a heat exchange channel.

[0027] In the above-described scheme, the first heat exchange groove is formed by a recess in the first heat exchange plate itself. Compared to the scheme where the first heat exchange groove is formed by splicing multiple plates, this reduces the splicing gaps and lowers the risk of leakage in the heat exchange channel. Furthermore, compared to the scheme where a groove is cut into the first heat exchange plate to form the first heat exchange groove, the thickness of the first heat exchange plate can be made thinner, which is beneficial for the development of thinner and lighter heat exchange components; moreover, the overall structural strength of the first heat exchange plate is greater.

[0028] To solve the aforementioned technical problems, another technical solution adopted in this application is to provide an energy storage device. This energy storage device includes the battery device described above.

[0029] To address the aforementioned technical problems, another technical solution adopted in this application is to provide an energy storage system. This energy storage system includes a power conversion device and the aforementioned energy storage device, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

[0030] To address the aforementioned technical problems, another technical solution adopted in this application is to provide a charging network. This charging network includes charging piles and the aforementioned energy storage device, which provides electrical energy to the charging piles.

[0031] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0032] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a schematic diagram of the structure of a charging network provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of an energy storage device provided in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of an energy storage system provided in an embodiment of this application; Figure 4 This is a schematic diagram of the overall structure of a battery device provided in an embodiment of this application; Figure 5 Provided for an embodiment of this application Figure 4 A disassembly diagram of the battery device shown; Figure 6 A disassembled schematic diagram of a heat exchange component provided in an embodiment of this application; Figure 7 for Figure 6 The diagram shows the structure of the first heat exchange plate. Figure 8 A schematic diagram of the distribution of heat exchange channels within a heat exchange area provided in an embodiment of this application; Figure 9 A schematic diagram showing the distribution of heat exchange channels within a heat exchange area, provided for another embodiment of this application; Figure 10 for Figure 7 Enlarged view of point A in the structure shown; Figure 11 This is a schematic diagram of the structure of the first heat exchange plate and the second heat exchange plate after being fastened together, according to an embodiment of this application.

[0033] Explanation of reference numerals in the attached figures 1000 Charging network; 2000 Energy storage system; 3000 Power generation device; 100 Battery device; 200 Energy storage device; 210 Energy storage box; 300 Charging pile; 400 Energy storage converter; 10 Battery module; 11 Battery cell; 20 Heat exchange module; 20a Heat exchange area; 21 First port; 22 Heat exchange channel; 221 First main channel; 222 Second main channel; 2221 Second branch channel; 223 Third main channel; 224 Fourth main channel; 2241 Fourth branch channel; 23 First water nozzle; 24 Liquid distribution pipe; 25 Connector; 26 Second water nozzle; 27 First heat exchange plate; 271 Recess; 272 First heat exchange groove; 28 Second heat exchange plate; 281 Protrusion; 29 Clearance hole; 30 Upper box. Detailed Implementation

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0040] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0041] 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.

[0042] In battery devices, battery cells located in the central region of the battery module have a longer heat exchange path compared to those located at the edge of the module. Furthermore, the cumulative thermal coupling effect between multiple battery cells significantly reduces the heat dissipation capacity of the battery module under high-rate charge and discharge conditions, easily leading to excessively high localized temperatures. This results in an uneven temperature distribution within the entire battery device, affecting the temperature consistency between battery cells and reducing the overall lifespan of the battery system.

[0043] Based on this, this application provides a battery device including a heat exchange component with a spiral heat exchange channel. The temperature change pattern of the heat exchange channel matches the temperature gradient pattern within the battery module, which can improve the temperature consistency between battery cells, reduce the temperature difference between battery cells in the central region and battery cells in the edge region of the battery module, and make the temperature consistency of battery cells in various regions of the battery module better, thereby extending the life of the entire battery device.

[0044] The present application will now be described in detail with reference to the accompanying drawings and embodiments.

[0045] Please see Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of a charging network 1000 provided in one embodiment of this application; Figure 2 This is a schematic diagram of the structure of an energy storage device 200 provided in one embodiment of this application. In one embodiment, a charging network 1000 is provided, which includes a charging pile 300 and an energy storage device 200. The charging pile 300 is used to charge electrical equipment. The energy storage device 200 is electrically connected to the charging pile 300 and is used to provide electrical energy to the charging pile 300.

[0046] It should be noted that the charging pile 300 and the battery cells in the energy storage device 200 are electrically connected via cables, and the battery cells can supply their stored electrical energy to the charging pile 300. The charging pile 300 has a connector that can be connected to electrical equipment, thereby replenishing the equipment's power. The application of the energy storage device 200 in this charging network 1000 can effectively improve the safety of the charging network 1000 and also help to enhance the flexibility of the charging network 1000 during deployment.

[0047] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles. Spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0048] In a charging network 1000, there can be one charging pile 300, and the energy storage device 200 provides power to the one charging pile 300; there can also be multiple charging piles 300, and the energy storage device 200 provides power to multiple charging piles 300.

[0049] As an example, such as Figure 1 As shown, the charging network 1000 includes an energy storage device 200 and two charging piles 300, with the energy storage device 200 providing power to the two charging piles 300.

[0050] See Figure 2 The energy storage device 200 may include a battery device 100, which is electrically connected to the charging pile 300 so that the battery device 100 can provide power to the charging pile 300.

[0051] Please refer to Figure 2 and Figure 3 , Figure 3 This is a schematic diagram of the structure of an energy storage system 2000 provided in an embodiment of this application. The energy storage system 2000 includes an energy storage converter 400, a power conversion device, and an energy storage device 200.

[0052] The energy storage converter 400 can be electrically connected to the generator 3000 to convert the electrical power provided by the generator 3000. The energy storage device 200 is electrically connected to the energy storage converter 400, and the energy storage converter 400 converts the electrical energy provided by the generator 3000 and stores it in the energy storage device 200.

[0053] A power conversion device is used to connect the power generation device 3000 and the energy storage device 200. The power generation device 3000 generates electrical energy and stores it in the energy storage device 200 via the power conversion device. The use of the energy storage device 200 in the energy storage system 2000 effectively improves its operational safety. In specific implementations, the power generation device 3000 can be a solar panel, hydroelectric power generation equipment, thermal power generation equipment, etc. This application does not limit the specific type of the power generation device 3000.

[0054] As an example, such as Figure 3 As shown, the energy storage system 2000 includes an energy storage device 200 and an energy storage converter 400. The two power generation devices 3000 respectively transmit the generated electrical energy to the energy storage converter 400, and the energy storage converter 400 introduces the electrical energy into the energy storage device 200 for storage.

[0055] Please refer to Figure 2 The energy storage device 200 also includes an energy storage box 210, in which a battery device 100 is installed.

[0056] As an example, the energy storage device 200 can be an energy storage container, an energy storage cabinet, etc.

[0057] As an example, energy storage device 200 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage power stations can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. Wind power generation systems collect wind energy from wind turbines, convert it into electrical energy, and store it in energy storage device 200. Solar power generation systems can convert solar energy into electrical energy, store it in energy storage device 200, and supply it to users as needed. Mobile power systems can supply power to relevant electrical equipment in areas where the mains power supply cannot reach, such as remote mountainous areas and remote wilderness areas. Temporary power supply systems can provide power to users when there is insufficient power supply.

[0058] See Figures 4 to 7 , Figure 4 This is a schematic diagram of the overall structure of a battery device provided in an embodiment of this application; Figure 5 Provided for an embodiment of this application Figure 4 A disassembly diagram of the battery device shown; Figure 6 A disassembled schematic diagram of a heat exchange component provided in an embodiment of this application; Figure 7 for Figure 6 The diagram shows the structure of the first heat exchange plate.

[0059] In this embodiment, a battery device 100 is provided. The battery device 100 includes a battery assembly 10 and a heat exchange assembly 20. The battery assembly 10 includes at least two battery cells 11. The heat exchange assembly 20 includes at least two heat exchange regions 20a arranged in parallel along a first direction X; the battery assembly 10 is disposed on the heat exchange assembly 20 and covers at least two heat exchange regions 20a; the heat exchange region 20a includes a first port 21 and a heat exchange channel 22 that are connected to each other; the heat exchange channel 22 surrounds the periphery of the first port 21.

[0060] In some embodiments, multiple battery cells 11 can be connected in series, parallel, or mixed to form a battery module 10. In other embodiments, multiple battery cells 11 can also be connected in series, parallel, or mixed first, and then arranged in a fixed manner to form a battery module 10. In still other embodiments, multiple battery cells 11 can also be connected in series, parallel, or mixed first, and then arranged in a fixed manner to form multiple modules, which are then connected in series, parallel, or mixed to form a whole.

[0061] As an example, multiple battery cells 11 can be fixed together to form a battery assembly 10 using cable ties or the like. As another example, multiple battery cells 11 can also be fixed together to form a battery assembly 10 using end plates, side plates, or the like.

[0062] The battery cell 11 involved in this application refers to the smallest unit for storing and outputting electrical energy. The battery cell 11 can be a secondary battery or a primary battery. The battery cell 11 can be, but is not limited to, a metal battery, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery. The battery cell 11 can be cylindrical, flat, cuboid, or other shapes.

[0063] The battery cell 11 may include a casing, electrode assemblies, and other functional components. The casing includes an end cap and a bottom shell. The end cap is a component that closes onto the opening of the bottom shell to isolate the internal environment of the battery cell 11 from the external environment. In any case, the shape of the end cap may be adapted to the shape of the bottom shell. Optionally, the end cap may be made of a material with a certain degree of hardness and strength (such as aluminum alloy), so that the end cap is less prone to deformation under pressure and impact, giving the battery cell 11 higher structural strength and improved safety performance.

[0064] The end cap may be provided with functional components such as electrode terminals. The electrode terminals can be used for electrical connection with the electrode assembly to output or input electrical energy to the battery cell 11. In some embodiments, the electrode terminals may include terminals. Terminals may include positive and negative terminals for current output and connection to external circuits. In some embodiments, the end cap may also be provided with an explosion-proof component for releasing internal pressure when the internal pressure or temperature of the battery cell 11 reaches a threshold. The end cap can be made of various materials, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, and plastic. In some embodiments, an insulating component may be provided on the inner side of the end cap to isolate the electrical connection components within the bottom shell from the end cap, reducing the risk of short circuits. For example, the insulating component may be plastic, rubber, etc. The bottom shell is an assembly used to cooperate with the end cap to form the internal environment of the battery cell 11, wherein the formed internal environment can accommodate the electrode assembly, electrolyte, and other components. The bottom shell and end cap can be independent components. An opening can be provided on the bottom shell, and the end cap closes the opening to form the internal environment of the battery cell 11. Alternatively, the end cap and bottom shell can be integrated. Specifically, the end cap and bottom shell can form a common connection surface before other components are installed. When it is necessary to encapsulate the interior of the bottom shell, the end cap closes the bottom shell. The bottom shell can have various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the bottom shell can be determined according to the specific shape and size of the electrode assembly. The bottom shell can be made of various materials, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0065] The electrode assembly is the component within the battery cell 11 where electrochemical reactions occur. The bottom casing may contain one or more electrode assemblies. The electrode assembly is primarily formed by winding or stacking positive and negative electrode sheets, and typically includes a separator between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly, while the portions without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or separately at both ends. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current loop.

[0066] In this application, "at least two" means two or more (including two).

[0067] The battery assembly 10 has a heat exchange contact surface, which is configured to contact the heat exchange assembly 20.

[0068] The central region and edge region of the battery module 10 specifically refer to the central region and edge region of the heat exchange contact surface of the battery module 10. The central region can be a circular region or a polygonal region; the straight-line distance (i.e., the radius mentioned above) between each side of the polygonal region and the center of the central region is the same. The polygonal region can be a square region, a triangular region, or a hexagonal region, etc.

[0069] The central region of the battery module 10 refers to the center of the heat exchange contact surface of the battery module 10. For example, if the battery module 10 is divided into a nine-square grid, the central region of the battery module 10 is located at the very center of the nine-square grid.

[0070] For example, the area of ​​the central region is less than or equal to the sum of the areas of the bottom or top surfaces of the four battery cells 11. As an example, the area of ​​the central region may be the same as the sum of the areas of the bottom or top surfaces of one, two, three, or four battery cells 11.

[0071] For example, the ratio of the area of ​​the central region to the area of ​​the entire heat exchange contact surface of the battery assembly 10 is greater than or equal to 0.1 and less than or equal to 0.15. For example, the ratio may be 0.1, 0.11, 0.12, 0.13, 0.14 or 0.15.

[0072] In one example, the battery assembly 10 covering at least two heat exchange regions 20a means that the orthographic projection of the battery assembly 10 onto the heat exchange assembly 20 falls within at least two heat exchange regions 20a. That is, in this example, the area of ​​the battery assembly 10 is less than the sum of the areas of the at least two heat exchange regions 20a.

[0073] In another example, "battery assembly 10 covering at least two heat exchange regions 20a" means that the orthographic projection of battery assembly 10 onto heat exchange assembly 20 covers at least two heat exchange regions 20a. That is, in this example, the area of ​​battery assembly 10 is greater than or equal to the sum of the areas of at least two heat exchange regions 20a.

[0074] In one example, battery assembly 10 covers all heat exchange areas 20a.

[0075] For example, the battery assembly 10 covering four heat exchange regions 20a means that the orthographic projection of the battery assembly 10 onto the heat exchange assembly 20 falls within the four heat exchange regions 20a. That is, in this example, the area of ​​the battery assembly 10 is less than the sum of the areas of the four heat exchange regions 20a.

[0076] Alternatively, "battery assembly 10 covers four heat exchange regions 20a" means that the orthographic projection of battery assembly 10 onto heat exchange assembly 20 covers all four heat exchange regions 20a. That is, in this example, the area of ​​battery assembly 10 is greater than or equal to the sum of the areas of the four heat exchange regions 20a.

[0077] In one example, each heat exchange region 20a includes a connected first port 21 and a heat exchange channel 22. Of course, in other examples, some heat exchange regions 20a may include the connected first port 21 and the heat exchange channel 22, while some heat exchange regions 20a may not include the connected first port 21 and the heat exchange channel 22.

[0078] The heat exchange assembly 20 is configured to exchange heat with the battery cells 11 in contact with it. The orthographic projection of the battery assembly 10 onto the heat exchange assembly 20 lies within a plurality of heat exchange regions 20a. The heat exchange mode of the heat exchange assembly 20 for the battery assembly 10 includes at least one of a cooling mode and a heating mode. The cooling mode is a process of cooling down the battery assembly 10. The heating mode is a process of heating up the battery cells 11.

[0079] The portion of the battery module 10 corresponding to a heat exchange region 20a is defined as the heat exchange section. It should be noted that in the relevant descriptions of reducing the temperature difference between the battery cells 11 in the central region and the edge region of the battery module 10 through the heat exchange medium in the heat exchange channel 22 in this application, the central region and the edge region of the battery module 10 refer to the central region and the edge region of the heat exchange section.

[0080] In one example, the heat exchange channel 22 has a first end and a second end, one of which is configured as a liquid inlet and the other as a liquid outlet. In one example, the first end of the heat exchange channel 22 is connected to a first port 21.

[0081] In the cooling mode, where the battery module 10 is cooled by the heat exchange component 20, the overall temperature of the battery module 10 is high, requiring cooling. The temperature of the individual battery cells 11 increases as the coolant approaches the center of the battery module 10. In this mode, the heat exchange channel 22 receives liquid from the first port 21 and exits from the second end. The low-temperature coolant enters the heat exchange channel 22 from the first port 21, and its low temperature allows for rapid cooling of the battery cells 11 located in the center of the battery module 10 (i.e., the center of the heat exchange section). Therefore, the cooling effect on the battery cells 11 in the central region of the battery module 10 is most significant. The coolant entering from the first port 21 flows outwards through the heat exchange channel 22 in concentric circles. During this flow, the coolant heats up due to heat exchange. Therefore, as the coolant flows from the first port 21 to the second end of the heat exchange channel 22, its temperature gradually increases, resulting in a smaller and smaller cooling effect on the battery cells 11. Since the temperature of the battery cells 11 in the central region of the battery module 10 (i.e., the central region of the heat exchange section) is inherently higher than that of the battery cells 11 in the edge region of the battery module 10 (i.e., the edge region of the heat exchange section) when not under heat dissipation, the battery cells 11 in the central region of the battery module 10 have a relatively greater need for cooling, while the battery cells 11 in the edge region of the battery module 10 have a relatively smaller need for cooling. Therefore, the coolant entering from the first port 21 and flowing to the periphery can just balance the difference in cooling needs between the central and edge regions of the battery module 10, making the temperatures of the battery cells 11 in the central and edge regions of the battery module 10 similar and the temperature difference small.

[0082] In the heating mode, that is, when the battery cell 11 is heated by the heat exchange component 20, the temperature of the entire battery module 10 is low and heating is required. At this time, the temperature of the battery cell 11 in the edge area is lower than that of the battery cell 11 in the center area, and the temperature of the battery cell 11 is lower the closer to the edge area. In this scenario, the heat exchange medium enters from the second end of the heat exchange channel 22 and exits from the first port 21. The high-temperature heat exchange medium enters the heat exchange channel 22 from the second end. At this time, the temperature of the heat exchange medium is high, which can quickly heat up the battery cells 11 in the edge region. Therefore, the temperature rise of the battery cells 11 in the edge region is the most obvious. The heat exchange medium cools down due to heat exchange during the flow process. Therefore, as the heat exchange medium flows from the second end of the heat exchange channel 22 to the first port 21, the temperature of the heat exchange medium gradually decreases, and the temperature rise of the battery cells 11 becomes smaller and smaller. Since the temperature of the battery cells 11 in the center region before heating is higher than that of the battery cells 11 in the edge region, the battery cells 11 in the center region of the battery module 10 have a relatively small need for temperature rise, while the battery cells 11 in the edge region of the battery module 10 have a relatively large need for temperature rise. Therefore, the heat exchange medium enters from the second port of the heat exchange channel 22 and flows to the first port 21, which can just balance the difference in the heating demand between the central region and the edge region of the battery module 10, so that the temperature of the battery cells 11 in the central region and the edge region of the battery module 10 is close and the temperature difference is small.

[0083] The following embodiments of this application all use the heat exchange component 20 to cool down the battery cell 11 as an example.

[0084] In one example, see Figure 5 Multiple battery cells 11 are arranged in an array, and the number of battery cells 11 distributed along the second direction Y of the battery assembly 10 is less than the number of battery cells 11 distributed along the first direction X of the battery assembly 10. The distance between a battery cell 11 located in the central region of the battery assembly 10 along the second direction Y and its edge along the second direction Y is a first distance. The distance between a battery cell 11 located in the central region of the battery assembly 10 along the first direction X and its edge along the first direction X is a second distance, which is greater than the first distance. It can be understood that the battery cells 11 located in the central region of the battery assembly 10 along the first direction X have a relatively higher cooling requirement, and the heat dissipation path of the battery assembly 10 to both sides along the second direction Y is shorter.

[0085] Therefore, in this example, at least two heat exchange regions 20a of the heat exchange component 20 are arranged in parallel along the first direction X. Compared with setting a complete series heat exchange channel, this shortens the path of each heat exchange channel 22, thereby reducing flow resistance and removing heat from the battery cell 11 more quickly and significantly. Moreover, it can reduce the amount of coolant used, the flow rate and power consumption of the liquid supply component, and reduce the cost of the battery device 100.

[0086] In one example, the battery assembly 10 can be bonded to the heat exchange assembly 20 with thermally conductive adhesive to reduce the contact thermal resistance between the battery assembly 10 and the heat exchange assembly 20.

[0087] Of course, in other examples, at least two heat exchange regions 20a can also be arranged sequentially along the second direction Y. Alternatively, multiple heat exchange regions 20a can be arranged in an array. All embodiments in this application use... Figure 7 The distribution shown is an example.

[0088] In some examples, the structures of the heat exchange regions 20a are identical; the areas of the heat exchange regions 20a are identical.

[0089] In one example, each heat exchange region 20a is arranged sequentially along the first direction X, and the second end of the heat exchange channel 22 of each heat exchange region 20a extends to at least one edge of the heat exchange component 20 along the second direction Y, so as to balance the temperature difference between the central region and the edge region of the multiple battery cells 11 corresponding to each heat exchange region 20a through the heat exchange channel 22.

[0090] Of course, in other examples, the second end of the heat exchange channel 22 of the two outermost heat exchange regions 20a along the first direction X may also extend to one side edge of the heat exchange assembly 20 along the first direction X.

[0091] In one example, at least a portion of the heat exchange channel 22 is arranged around the first port 21 at least twice in the circumferential direction, and the second end of the heat exchange channel 22 extends to the edge of the heat exchange assembly 20. This allows the temperature change pattern of the coolant flowing within the heat exchange channel 22 to match the temperature gradient change pattern from the center region to the edge region of the battery assembly 10, which is more conducive to improving the temperature consistency between battery cells 11 in different regions; moreover, it can increase the heat exchange area and ensure a superior heat exchange effect.

[0092] The number of turns of the heat exchange channel 22 around the first port 21 in the circumferential direction and the spacing between each two adjacent turns of the channel can be set according to actual needs.

[0093] It should be noted that the heat exchange channel 22 involved in this application, which has at least two turns around the first port 21 in the circumferential direction, is formed by a single channel connected in series and spiraling from the inside out to form multiple turns of the channel. Adjacent turns of the channel are interconnected, and there is no independent, complete, closed loop channel as a whole.

[0094] For example, the number of turns of the heat exchange channel 22 corresponding to each heat exchange region 20a can be the same, and the spacing between each two adjacent turns of the channel can be the same. In this way, the heat exchange uniformity of each heat exchange region 20a to the battery cell 11 can be increased; and the size of each heat exchange region 20a along the first direction X can be made to be basically the same, thereby improving the heat exchange uniformity of the battery assembly 10 at each position along the first direction X.

[0095] In some examples, the entire heat exchange channel 22 is coiled within the same plane. This allows the heat exchange channel 22 to effectively contact the heat exchange contact surface of the battery assembly 10, resulting in more uniform heat exchange between the heat exchange assembly 20 and the battery assembly 10, reducing the problem of localized high temperatures caused by poor local contact. Furthermore, the coiled heat exchange channel 22 within the same plane saves space in the height direction of the heat exchange assembly 20, thus helping to reduce the volume of the heat exchange assembly 20.

[0096] In one example, the heat exchange assembly 20 includes four heat exchange regions 20a along the first direction X; the number of heat exchange regions 20a is not limited in this application. Furthermore, the size and area of ​​each heat exchange region 20a, the length, width, and depth of the heat exchange channels 22, and the spacing between the channels are not limited to those described in this application.

[0097] In one example, the width-to-height ratio of the heat exchange channel 22 can be greater than or equal to 0.1 and less than or equal to 10. For example, the width-to-height ratio of the heat exchange channel 22 can be greater than or equal to 1 and less than or equal to 10. Alternatively, the width-to-height ratio of the heat exchange channel 22 can be greater than or equal to 1 and less than or equal to 5.

[0098] For example, the ratio of the width to the height of the heat exchange channel 22 can be 0.1, 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10.

[0099] In one example, the battery device 100 further includes a battery housing. The battery assembly 10 is disposed within the battery housing. In one example, the battery housing includes an upper housing 30 having a receiving groove. The opening of the upper housing 30 faces and is connected to the heat exchange assembly 20, and cooperates with the heat exchange assembly 20 to form a receiving cavity. The battery assembly 10 is located within the receiving cavity.

[0100] In this example, multiple spaced mounting holes can be formed on the circumferential edge of the heat exchange assembly 20, and the upper housing 30 and the heat exchange assembly 20 can be fixedly connected by fasteners engaging with the mounting holes. For example, the fasteners can be bolts and nuts.

[0101] For example, the shape and aspect ratio of the battery box are not limited. The battery cell 11 is not limited to a prismatic battery cell, and the arrangement of the battery cells 11 is not limited to the arrangement shown in the accompanying drawings.

[0102] The battery device 100 provided in this embodiment allows coolant to enter through the first port 21. Since the coolant enters the heat exchange channel 22 from the first port 21, its temperature is relatively low, enabling a significant cooling effect on the battery cells 11 in the central region of the battery assembly 10. However, as the coolant exchanges heat with the battery cells 11 during its flow, its temperature gradually increases. Therefore, as the coolant flows through the heat exchange channel 22, its temperature gradually rises, and the cooling effect on the battery cells 11 becomes smaller and smaller. For the unheated battery assembly 10, since the temperature of the battery cells 11 in the central region is already higher than that in the edge regions, this solution can significantly cool the battery cells 11 in the central region and only slightly cool the battery cells 11 in the edge regions, thus reducing the temperature difference between them. This results in better temperature uniformity across all regions of the battery assembly 10 and extends its lifespan. Furthermore, by including at least two heat exchange regions 20a arranged in parallel along the first direction X in the heat exchange assembly 20, the path of the heat exchange channel 22 of each heat exchange region 20a is relatively shorter compared to a scheme that includes only one heat exchange region 20a, which can reduce flow resistance; moreover, the width of the heat exchange channel 22 can be controlled within a certain range to reduce the total volume of the heat exchange channel 22, thereby reducing the amount of coolant used, the flow rate and power consumption of the liquid supply assembly, and the cost of the battery device 100. In one embodiment, see Figure 8 , Figure 8 This is a schematic diagram showing the distribution of heat exchange channels 22 within a heat exchange region 20a according to an embodiment of this application. The heat exchange channels 22 include a first main channel 221 and a second main channel 222. The first main channel 221 is connected to a first port 21 and is arranged around the first port 21 in the circumferential direction at least two times. The second main channel 222 is connected in series with the first main channel 221 and is located on at least one side of the first main channel 221 along a second direction Y, which intersects with the first direction.

[0103] The edge of heat exchange component 20 refers to its circumferential edge. In one example, the edge of battery component 10 is set to correspond to the edge of heat exchange component 20.

[0104] For example, the number of times the first main channel 221 coils around the first port 21 can be 2, 3, 4, 5, 6, 7, 8, 9, 10, etc., and this application does not limit this. The number of times the first main channel 221 coils around the first port 21 in the circumferential direction and the spacing between each adjacent coil can be set according to actual needs.

[0105] In some examples, the first main channel 221 can have a coiled shape in the plane that is rectangular, circular, or elliptical, etc.

[0106] For example, see Figure 5 and Figure 7 The orthographic projection of the battery assembly 10 onto the heat exchange assembly 20 is rectangular, and the single-loop winding shape of the first main channel 221 is also rectangular. Thus, the winding shape of the first main channel 221 is adapted to the shape of the orthographic projection of the battery assembly 10 onto the heat exchange assembly 20, and the first main channel 221 can be wound in a rectangular shape along the rectangular arrangement of the battery cells 11, which can better facilitate heat exchange with the battery assembly 10.

[0107] Of course, in some other examples, the orthographic projection of the battery assembly 10 onto the heat exchange assembly 20 is circular, and the single-turn coil shape of the first main channel 221 is also circular. Alternatively, the orthographic projection of the battery assembly 10 onto the heat exchange assembly 20 is elliptical, and the single-turn coil shape of the first main channel 221 is also elliptical.

[0108] In one example, the second main channel 222 is located on one side of the first main channel 221 along the second direction Y.

[0109] In one example, the second direction Y is perpendicular to the first direction X.

[0110] In this embodiment, the temperature of the battery cells 11 in the central region is higher, requiring greater cooling, while the temperature of the battery cells 11 in the edge region is lower, requiring less cooling. Therefore, this solution allows the temperature change pattern of the coolant flowing through the first main channel 221 to match the temperature gradient change pattern from the central region to the edge region of the battery assembly 10, significantly reducing the temperature of each battery cell 11 at the corresponding location. Furthermore, the coolant flowing through the second main channel 222 can provide a small-scale cooling effect on the battery cells 11 at the edges, thereby reducing the temperature difference between battery cells 11 in different regions.

[0111] In one embodiment, see Figure 8The second main channel 222 includes a plurality of second branch channels 2221 arranged in parallel. The plurality of second branch channels 2221 are respectively connected to the first main channel 221 and extend to the edge of the heat exchange component 20.

[0112] Multiple second-branch channels 2221 are distributed in parallel. Compared with the scheme of connecting each second-branch channel 2221 in series, the channel path is shorter and the flow resistance is smaller, which can reduce the width of the channel to a certain range.

[0113] In one example, the second branch channel 2221 extends to one side edge of the heat exchange assembly 20 along the second direction Y. Of course, in other examples, the second branch channels 2221 of the two outermost heat exchange regions 20a of the heat exchange assembly 20 along the first direction X may also extend to one side edge of the heat exchange assembly 20 along the first direction X.

[0114] In one example, a plurality of second branch channels 2221 are arranged sequentially along a first direction X, and at least a portion of each second branch channel 2221 extends along a second direction Y.

[0115] In one example, the ratio of the total spiral length of the first main channel 221 to the sum of the lengths of all second branch channels 2221 in the second main channel 222 can be greater than or equal to 0.1 and less than or equal to 1000. For example, the ratio of the total spiral length of the first main channel 221 to the sum of the lengths of all second branch channels 2221 in the second main channel 222 can be greater than or equal to 1 and less than or equal to 500. Alternatively, the ratio of the total spiral length of the first main channel 221 to the sum of the lengths of all second branch channels 2221 in the second main channel 222 can be greater than or equal to 5 and less than or equal to 100. Alternatively, the ratio of the total spiral length of the first main channel 221 to the sum of the lengths of all second branch channels 2221 in the second main channel 222 can be greater than or equal to 5 and less than or equal to 50.

[0116] For example, the ratio of the total spiral length of the first main channel 221 to the sum of the lengths of all the second branch channels 2221 in the second main channel 222 can be 0.1, 1, 5, 10, 20, 50, 100, 200, 400, 600, 800, or 1000. The specific ratio can be set according to the actual size of the heat exchange region 20a, as well as the number of spiral turns, the spacing between adjacent channels, etc.

[0117] Of course, see other examples as well. Figure 9 , Figure 9 This is a schematic diagram showing the distribution of heat exchange channels 22 within the heat exchange region 20a according to another embodiment of this application. The heat exchange channels 22 may also exclude the second main channel 222, with the first main channel 221 directly extending around the edge of the heat exchange assembly 20.

[0118] In this embodiment, since the second main channel 222 includes multiple second branch channels 2221 arranged in parallel, compared with the second main channel 222 being in series, the second main channel 222 adopts a parallel channel design. The flow resistance of the second main channel 222 is lower, which reduces the flow resistance of the entire heat exchange channel 22, reduces the energy loss of the coolant during the flow process and the power consumption of the power element driving the coolant flow, and at the same time improves the uniformity of the coolant flow velocity in the entire heat exchange channel 22.

[0119] In one embodiment, see Figure 10 , Figure 10 for Figure 7 Enlarged view of point A in the structure shown. The heat exchange channel 22 also includes a third main channel 223; the third main channel 223 is connected to the first port 21 and is arranged around the first port 21 in the circumferential direction at least two times; and the third main channel 223 and the first main channel 221 are nested together.

[0120] In one example, the third main channel 223 is coiled in the opposite direction to the first main channel 221. The specific coiling method of the third main channel 223 is similar to that of the first main channel 221.

[0121] The third main channel 223 and the first main channel 221 are nested together, and in each heat exchange region 20a, the third main channel 223 and the first main channel 221 are alternately distributed along the radial direction from the center region to the edge region of the heat exchange region 20a.

[0122] For example, the spacing between any two adjacent third main channel 223 and first main channel 221 is the same.

[0123] In this embodiment, in addition to the first main flow channel 221, a third main flow channel 223 is further added. The third main flow channel 223 can increase the heat exchange area between the heat exchange channel 22 and the battery module 10, thereby improving the heat exchange efficiency and heat exchange amplitude of the battery cells 11 at the corresponding positions. At the same time, the distribution of the third main flow channel 223 can also make the temperature change pattern of the coolant flowing in the third main flow channel 223 match the temperature gradient change pattern from the center region to the edge region of the battery module 10, thereby significantly reducing the temperature of each battery cell 11 at the corresponding positions.

[0124] In one embodiment, see Figure 10 The fourth main channel 224 includes a plurality of fourth branch channels 2241 arranged in parallel. The plurality of fourth branch channels 2241 are respectively connected to the third main channel 223 and extend to the edge of the heat exchange component 20. The fourth main channel 224 and the second main channel 222 are located on both sides of the first main channel 221 along the second direction Y.

[0125] Each of the fourth branch channels 2241 is connected in series with the third main channel 223.

[0126] Multiple fourth branch channels 2241 are distributed in parallel. Compared with the scheme of connecting each fourth branch channel 2241 in series, the channel path is shorter and the flow resistance is smaller, which can reduce the width of the channel to a certain range.

[0127] In one example, the fourth branch channel 2241 extends to one edge of the heat exchange assembly 20 along the second direction Y. Of course, in other examples, the fourth branch channel 2241 of the two outermost heat exchange regions 20a of the heat exchange assembly 20 along the first direction X may also extend to the corresponding edge of the heat exchange assembly 20 along the first direction X.

[0128] In one example, a plurality of fourth branch channels 2241 are arranged sequentially along a first direction X, and at least a portion of each fourth branch channel 2241 extends along a second direction Y.

[0129] Of course, in other examples, the heat exchange channel 22 may also exclude the second mainstream channel 222 and the fourth mainstream channel 224.

[0130] This application does not limit the specific location of the second main channel 222 and the fourth main channel 224 along the second direction Y.

[0131] In this embodiment, by adding a fourth main flow channel 224, the coolant in the fourth main flow channel 224 can slightly cool the battery cells 11 in the edge region. Simultaneously, the fourth main flow channel 224 and the second main flow channel 222 can evenly distribute the temperature of the battery cells 11 in the central region of the battery assembly 10 along the second direction Y to both sides of the heat exchange assembly 20, thereby improving the temperature uniformity between the central and edge regions of the battery assembly 10 along the second direction Y. Furthermore, since the fourth main flow channel 224 includes multiple fourth branch channels 2241 arranged in parallel, the flow resistance of the fourth main flow channel 224 is low, further reducing the flow resistance of the entire heat exchange channel 22, reducing the energy loss of the coolant during flow and the power consumption of the driving components for the coolant flow, and improving the uniformity of the coolant flow velocity throughout the entire heat exchange channel 22.

[0132] In one embodiment, see Figure 10 The first port 21 is located in the central region of the heat exchange channel 22.

[0133] In one example, the first port 21 is located along the center line of the heat exchange assembly 20 in the second direction Y. The center line of the battery assembly 10 along the second direction Y coincides with the center line of the heat exchange assembly 20 along the second direction Y.

[0134] The above-described solution in this embodiment allows the coolant, which enters from the first port 21 at a lower temperature, to exchange heat with the central region of the battery module 10, which has a higher temperature, so as to remove more heat from the central region of the battery module 10 and thereby balance the temperature difference between the central region and the edge region of the battery module 10.

[0135] In one embodiment, see Figure 10 The second branch channel 2221 and / or the fourth branch channel 2241 are distributed in a serpentine pattern.

[0136] In one example, the serpentine flow distribution refers to the flow channel including multiple rows of sub-flow channels along the first direction X, with adjacent rows of sub-flow channels arranged in opposite directions (i.e., along the second direction Y, one row goes from the first side to the second side, and the next row goes from the second side to the first side, back and forth), and adjacent rows of flow channels are connected end to end in a serpentine pattern.

[0137] In one example, the second branch channel 2221 and the fourth branch channel 2241 are arranged in a serpentine pattern. In another example, the second branch channel 2221 is arranged in a serpentine pattern; or the fourth branch channel 2241 is arranged in a serpentine pattern.

[0138] Of course, in other examples, the second branch channel 2221 may extend along the second direction Y and be in a straight line. The fourth branch channel 2241 may also extend along the second direction Y and be in a straight line.

[0139] Alternatively, in some examples, some of the second branch channels 2221 are serpentine, while some are linear. Some of the fourth branch channels 2241 are serpentine, while some are linear.

[0140] In this embodiment, by making the second branch channel 2221 and / or the fourth branch channel 2241 arranged in a serpentine pattern, the heat exchange area of ​​the second branch channel 2221 and / or the fourth branch channel 2241 can be increased, thereby improving the heat exchange effect.

[0141] In one embodiment, see Figure 6 The heat exchange assembly 20 also includes a first water nozzle 23 and a liquid distribution pipe 24; the liquid distribution pipe 24 is connected to the first water nozzle 23, and the first port 21 is connected to the liquid distribution pipe 24.

[0142] In one example, the first water nozzle 23 is configured to connect to a liquid supply assembly to supply liquid to the heat exchange channel 22. The liquid supply assembly stores or is used to store coolant. Exemplarily, the first water nozzle 23 is directly connected to one end of the distribution pipe 24 and is in direct communication with the distribution pipe 24.

[0143] In one example, the distributor 24 extends along a first direction X to reduce the flow path of the coolant within the distributor 24 and reduce flow resistance.

[0144] In this embodiment, liquid can be supplied to each heat exchange area 20a through the same liquid supply component, which not only simplifies the product structure and saves costs, but also helps to improve the heat exchange uniformity of each heat exchange area 20a and reduce the temperature difference between different areas of the battery component 10.

[0145] In one embodiment, see Figure 5 The liquid separator 24 has a flow chamber (not shown in the figure) and multiple connectors 25 spaced apart. The flow chamber is connected to the first water nozzle 23. The multiple connectors 25 are respectively connected to the flow chamber and respectively connected to the first port 21 and connected to the first port 21.

[0146] In one example, the dispensing tube 24 includes a tube body, the hollow structure of which forms a flow cavity. Exemplarily, the flow cavity extends along a first direction X, and the flow cavity has a constant diameter orifice along the first direction X.

[0147] In one example, connector 25 can be welded to the pipe body. Alternatively, connector 25 can be integrally formed with the pipe body.

[0148] In one example, connector 25 can be screwed onto first port 21 to increase the reliability of the connection between connector 25 and first port 21 and improve the sealing performance of the connection between connector 25 and first port 21.

[0149] In this embodiment, the liquid distribution tube 24 can be directly connected to the first port 21 without the need for additional adapter tubes and connectors, which simplifies the structural layout of the battery device 100, reduces the product volume, and lowers the cost.

[0150] In one embodiment, a connector 25 corresponds to a first port 21; the connector 25 has a connecting hole, and the diameter of the connecting hole of each connector 25 gradually increases in the direction away from the first water nozzle 23.

[0151] In one example, each connector 25 has a through hole. The through hole is a straight through hole that extends through the connector 25.

[0152] In one example, multiple connectors 25 are spaced apart along a first direction X and located on one side of a first water nozzle 23 along the first direction X, and the diameter of the connecting holes of the multiple connectors 25 gradually increases in the direction away from the first water nozzle 23.

[0153] In this embodiment, the liquid flow rate at each first port 21 can be adjusted by using different apertures of each connecting hole, so that the liquid flow rate flowing into each first port 21 is basically the same, thereby improving the heat exchange uniformity of each heat exchange region 20a, which is beneficial to uniformly adjusting the temperature of each position of the battery assembly 10 along the first direction X.

[0154] In one embodiment, the heat exchange assembly 20 further includes a reversing mechanism (not shown in the figure), which is configured to switch the flow direction of the heat exchange medium in the heat exchange channel 22 so that the heat exchange channel 22 is filled with liquid from the first port 21; or so that the heat exchange channel 22 is discharged from the first port 21.

[0155] The reversing mechanism is used to change the flow direction of the heat exchange medium within the heat exchange channel 22. The specific type of the reversing mechanism is not limited; for example, it could be an electromagnetic reversing valve.

[0156] In one example, see Figure 5 The heat exchange assembly 20 also includes a second water nozzle 26, which is connected to the second end of each heat exchange channel 22. The heat exchange medium in each heat exchange channel 22 can flow out through the second water nozzle 26 or enter through the second water nozzle 26.

[0157] In this example, the reversing mechanism is configured to allow liquid to enter the heat exchange channel 22 from the first port 21 and exit from the second nozzle 26 in cooling mode. In heating mode, the heat exchange channel 22 allows liquid to enter from the second nozzle 26 and exit from the first port 21, finally flowing out through the first nozzle 23.

[0158] For example, the reversing mechanism includes two reversing valves, which are respectively located on the first water nozzle 23 and the second water nozzle 26, to switch the flow direction of the heat exchange medium in the heat exchange channel 22.

[0159] In one example, see Figure 4 The first water nozzle 23 and the second water nozzle 26 are both located outside the receiving groove of the battery box to facilitate liquid inlet and outlet.

[0160] In one example, the second ends of all heat exchange channels 22 converge at the same location, with the second water nozzle 26 located directly above that location.

[0161] For example, the heat exchange assembly 20 is further provided with a converging flow channel on both sides along the second direction Y, and the second ends of each heat exchange channel 22 converge into the converging flow channel. The first end of the converging flow channel can extend to one side of the heat exchange assembly 20 along the first direction X, and the second water nozzle 26 is provided corresponding to the first end of the converging flow channel.

[0162] For example, the first water nozzle 23 and the second water nozzle 26 are located on the same side of all heat exchange channels 22.

[0163] In this embodiment, under the cooling mode, i.e., when heat dissipation and cooling of the battery module 10 are required, the temperature of the entire battery module 10 is high, necessitating heat dissipation and cooling. Furthermore, the temperature of the individual battery cells 11 is higher closer to the center of the battery module 10. In this mode, the reversing mechanism causes the heat exchange channel 22 to receive liquid from the first port 21 and exit from the second end of the heat exchange channel 22. Low-temperature coolant enters the heat exchange channel 22 from the first port 21. At this time, the coolant temperature is low, enabling rapid cooling of the individual battery cells 11 located in the center of the battery module 10. Therefore, the cooling effect on the individual battery cells 11 located in the middle region of the battery module 10 is most significant. As the coolant flows, it heats up due to heat exchange. Therefore, as the coolant flows from the first port 21 to the second end of the heat exchange channel 22, the temperature of the coolant gradually increases, and the cooling effect on the battery cells 11 becomes smaller and smaller. Since the temperature of the battery cells 11 in the central region of the battery module 10 is already higher than that of the battery cells 11 in the edge region of the battery module 10 when there is no heat dissipation, the cooling effect of the coolant on the battery cells 11 in the central region of the battery module 10 is the greatest, and the cooling effect on the battery cells 11 in the edge region of the battery module 10 is the smallest. Ultimately, the temperatures of the battery cells 11 in the central region and the edge region of the battery module 10 are similar, and the temperature difference is small.

[0164] In the heating mode, which requires heating the individual battery cells 11, the temperature of the entire battery module 10 is low and heating is required. At this time, the temperature of the individual battery cells 11 in the edge area is lower than that in the center area, and the temperature of the individual battery cells 11 is lower the closer to the edge area. In this scenario, the reversing mechanism causes the heat exchange medium to enter from the second end of the heat exchange channel 22 and exit from the first port 21. The high-temperature heat exchange medium enters the heat exchange channel 22 from the second end, at which point the coolant temperature is high enough to rapidly heat the battery cells 11 in the edge region. Therefore, the temperature rise of the battery cells 11 in the edge region is the most significant. As the coolant flows, it cools down due to heat exchange. Therefore, as the coolant flows from the second end of the heat exchange channel 22 to the first port 21, the temperature of the coolant gradually decreases, and the temperature rise of the battery cells 11 becomes smaller and smaller. Since the temperature of the battery cells 11 in the center region before heating is already higher than that of the battery cells 11 in the edge region, the temperature rise of the battery cells 11 in the edge region is the greatest, and the temperature rise of the battery cells 11 in the center region is the smallest. Therefore, the temperature of the battery cells 11 in the center region and the battery cells 11 in the edge region are ultimately very close, with a small temperature difference.

[0165] In one embodiment, see Figure 6 and Figure 11 , Figure 11 This is a schematic diagram of the structure of the first heat exchange plate 27 and the second heat exchange plate 28 after being fastened together, according to an embodiment of this application. The heat exchange assembly 20 includes a first heat exchange plate 27 and a second heat exchange plate 28. The second heat exchange plate 28 cooperates with the first heat exchange plate 27 to form a heat exchange channel 22; wherein, one of the first heat exchange plate 27 and the second heat exchange plate 28 is provided with a protrusion 281, and the other heat exchange plate is provided with a recess 271, and the protrusion 281 and the recess 271 are fastened together.

[0166] In one example, both the first heat exchange plate 27 and the second heat exchange plate 28 are plate-shaped, and the first heat exchange plate 27 and the second heat exchange plate 28 overlap each other.

[0167] In one example, see Figure 4 , Figure 5 and Figure 11 The second heat exchange plate 28 is located on the side of the first heat exchange plate 27 facing the battery assembly 10. The first heat exchange plate 27 and the second heat exchange plate 28 are respectively provided with clearance holes 29 at the positions corresponding to the first water nozzle 23. The first water nozzle 23 is connected to the liquid distribution pipe 24, passes through the clearance hole 29, and is exposed on the side of the second heat exchange plate 28 away from the first heat exchange plate 27.

[0168] In one example, the second water nozzle 26 is connected to the side of the second heat exchange plate 28 away from the first heat exchange plate 27 and communicates with the heat exchange channel 22.

[0169] In one example, see Figure 6 The central region of the first heat exchange plate 27 is recessed downward relative to its circumferential edge, forming a recessed portion 271. A heat exchange channel 22 is located on the recessed portion 271. The portion of the second heat exchange plate 28 corresponding to the central region of the first heat exchange plate 27 protrudes towards the first heat exchange plate 27, forming a protrusion 281. The depth of the recessed portion 271 is the same as the height of the protrusion 281 to improve the tightness of the connection between the first heat exchange plate 27 and the second heat exchange plate 28, reducing the risk of leakage from the heat exchange assembly 20.

[0170] For example, the first heat exchange plate 27 and the second heat exchange plate 28 can both be formed with a protrusion 281 and a recess 271 respectively by a stamping process.

[0171] Of course, in other examples, the first heat exchange plate 27 and the second heat exchange plate 28 may have multiple protrusions on the circumferential edge of one of the heat exchange plates, with the protrusions spaced apart along the circumferential direction of the plate. The other heat exchange plate has recesses corresponding to the protrusions, with one protrusion corresponding to one recess, and the protrusions are embedded in the corresponding recesses to achieve the connection between the first heat exchange plate 27 and the second heat exchange plate 28. The protrusions can also be replaced with protruding pillars, and the recesses can be replaced with blind holes.

[0172] In one example, the first heat exchange plate 27 and the second heat exchange plate 28 are further welded together. Exemplarily, the first heat exchange plate 27 and the second heat exchange plate 28 can be connected together by a brazing process.

[0173] In one example, to further increase the connection strength between the first heat exchange plate 27 and the second heat exchange plate 28, the first heat exchange plate 27 and the second heat exchange plate 28 can be further installed and positioned by connectors, such as bolts and nuts, and the connection between the two can be achieved.

[0174] In this embodiment, the first heat exchange plate 27 and the second heat exchange plate 28 are connected by the interlocking of the protrusion 281 and the recess 271, which facilitates the assembly and positioning of the first heat exchange plate 27 and the second heat exchange plate 28. In one embodiment, see Figure 6 In the first heat exchange plate 27 and the second heat exchange plate 28, at least a portion of the first heat exchange plate 27 is recessed in the direction away from the second heat exchange plate 28 to form a first heat exchange groove 272. The second heat exchange plate 28 is covered on the first heat exchange plate 27 and cooperates with the first heat exchange groove 272 to form a heat exchange channel 22.

[0175] In one example, the first heat exchange channel 272 can be formed by stamping. This can effectively improve the mechanical rigidity of the heat exchange assembly 20; and when optimizing the flow channel design, it can reduce the dependence of the heat exchange assembly 20 on the reinforcing structure and reduce the interference of the reinforcing structure on the arrangement of the heat exchange flow channel 22.

[0176] In one example, the second heat exchange plate 28 is provided with a second heat exchange groove (not shown in the figure) at the position corresponding to the first heat exchange groove 272. The second heat exchange groove and the first heat exchange groove 272 cooperate to form a heat exchange channel 22. In this way, with a certain cross-sectional area of ​​the heat exchange channel 22, the thickness of the first heat exchange plate 27 and the second heat exchange plate 28 can be controlled within a certain range, so that the first heat exchange plate 27 and the second heat exchange plate 28 have good structural strength and the risk of heat exchange being affected by the large thickness can be reduced.

[0177] For example, the second heat exchange tank can also be formed by stamping the second heat exchange plate 28.

[0178] Of course, in other examples, the second heat exchanger 28 may not be provided at the position corresponding to the first heat exchanger 27.

[0179] In this embodiment, the first heat exchange groove 272 is formed by a recess in the first heat exchange plate 27 itself. Compared with the solution of forming the first heat exchange groove 272 by splicing multiple plates, this reduces splicing gaps and lowers the risk of leakage in the heat exchange channel 22. At the same time, compared with the solution of forming the first heat exchange groove 272 by opening a groove in the first heat exchange plate 27, the thickness of the first heat exchange plate 27 can be made thinner, which is beneficial to the development of the heat exchange assembly 20 in a lighter and thinner form; moreover, the overall structural strength of the first heat exchange plate 27 is greater.

[0180] 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, characterized in that, include: A battery assembly, comprising at least two individual battery cells; A heat exchange assembly includes at least two heat exchange regions arranged in parallel along a first direction; the battery assembly is disposed on the heat exchange assembly and covers at least two of the heat exchange regions; each heat exchange region includes a first port and a heat exchange channel connected to it; the heat exchange channel surrounds the periphery of the first port.

2. The battery device according to claim 1, characterized in that, The heat exchange channel includes: The first main channel is connected to the first port and is arranged around the first port in the circumferential direction at least twice. The second main channel is connected in series with the first main channel. The second main channel is located on at least one side of the first main channel along a second direction, and the second direction intersects with the first direction.

3. The battery device according to claim 2, characterized in that, The second main channel includes a plurality of second branch channels arranged in parallel. The plurality of second branch channels are respectively connected to the first main channel and extend to the edge of the heat exchange component along the second direction.

4. The battery device according to claim 3, characterized in that, The heat exchange channel also includes: The third main channel is connected to the first port and is arranged around the first port at least twice in the circumferential direction; and the third main channel is nested with the first main channel.

5. The battery device according to claim 4, characterized in that, The heat exchange channel also includes: The fourth main channel includes multiple fourth branch channels arranged in parallel. The multiple fourth branch channels are connected in series with the third main channel and extend to the edge of the heat exchange component along the second direction. The fourth main channel and the second main channel are located on both sides of the first main channel along the second direction.

6. The battery device according to claim 1, characterized in that, The first port is located in the central region of the heat exchange channel.

7. The battery device according to claim 5, characterized in that, The second branch channel and / or the fourth branch channel are distributed in a serpentine pattern.

8. The battery device according to any one of claims 1-7, characterized in that, The heat exchange assembly also includes: First water tap; The liquid distribution tube is connected to the first water tap, and the first port is connected to the liquid distribution tube.

9. The battery device according to claim 8, characterized in that, The dispensing tube has a flow chamber and multiple connectors spaced apart. The flow chamber is connected to the first water tap. The multiple connectors are respectively connected to the flow chamber and respectively connected to the first port.

10. The battery device according to claim 9, characterized in that, One of the connectors corresponds to one of the first ports; The connector has a connecting hole, and the diameter of the connecting hole of each connector gradually increases in the direction away from the first water nozzle.

11. The battery device according to any one of claims 1-7, characterized in that, The heat exchange assembly also includes: The reversing mechanism is configured to switch the flow direction of the heat exchange medium in the heat exchange channel so that the heat exchange channel is filled with liquid from the first port; or, so that the heat exchange channel is discharged from the first port.

12. The battery device according to any one of claims 1-7, characterized in that, The heat exchange assembly includes: First heat exchange plate; The second heat exchange plate cooperates with the first heat exchange plate to form the heat exchange channel; wherein, one of the first heat exchange plate and the second heat exchange plate has a protrusion on its circumferential edge, and the other heat exchange plate has a recess on its circumferential edge, and the protrusion and the recess match and engage with each other.

13. The battery device according to claim 12, characterized in that, In the first heat exchange plate and the second heat exchange plate, at least a portion of the first heat exchange plate is recessed in a direction away from the second heat exchange plate to form a first heat exchange groove, and the second heat exchange plate is placed on the first heat exchange plate and cooperates with the first heat exchange groove to form the heat exchange channel.

14. An energy storage device, characterized in that, Includes the battery device as described in any one of claims 1-13.

15. An energy storage system, characterized in that, It includes a power conversion device and an energy storage device as described in claim 14, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

16. A charging network, characterized in that, It includes a charging pile and an energy storage device as described in claim 14, the energy storage device being used to provide electrical energy to the charging pile.

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