Battery pack and electric apparatus

Abstract

The present application relates to the technical field of batteries, and discloses a battery pack and an electric apparatus. The battery pack comprises a plurality of battery cells and a liquid cooling assembly. The liquid cooling assembly comprises a first cooling plate and a second cooling plate that are connected to each other, one of the first cooling plate and the second cooling plate is provided with a liquid inlet end, and the other is provided with a liquid outlet end. The first cooling plate is arranged between two adjacent battery cells, and is in thermally-conductive connection with the two adjacent battery cells. The second cooling plate is arranged on one side of the battery cells in a third direction, and is in thermally-conductive connection with the two adjacent battery cells. A coolant flows through the first cooling plate and the second cooling plate via the liquid inlet end and the liquid outlet end to achieve heat exchange with the battery cells, so as to quickly and evenly take away heat from the surfaces the battery cells. The first cooling plate and the second cooling plate are respectively provided with the liquid inlet end and the liquid outlet end, which can improve the cooling efficiency.

Description

Battery packs and electrical devices

[0001] This application claims priority to Chinese Patent Application No. 202422788380.1, filed on November 15, 2024, entitled "Battery Pack and Power Supply Device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application belongs to the field of battery technology, specifically relating to a battery pack and an electrical device. Background Technology

[0003] Currently, pure electric new energy vehicles have increasingly higher requirements for driving range, thus demanding higher battery energy density and space utilization. While increasing battery pack energy density, higher charge / discharge rates are also necessary. Since battery heat generation is related to cell internal resistance, and the charge / discharge rate is related to the battery pack energy, as battery pack energy and charge / discharge rate increase, battery heat generation also increases. Excessive heat accumulation within the battery pack can lead to rapid temperature rise and the risk of thermal runaway. Liquid cooling devices in related technologies are typically only located at the bottom of the battery pack, resulting in ineffective cooling.

[0004] Application content

[0005] Purpose of application: This application provides a battery pack and power supply device, aiming to solve the technical problem of poor cooling effect of liquid cooling components.

[0006] Technical solution: This application provides a battery pack having intersecting second and third directions. The battery pack includes:

[0007] Multiple individual cells are arranged along the second direction;

[0008] The liquid cooling assembly includes a first cold plate and a second cold plate connected to each other. The first cold plate has one of a liquid inlet and a liquid outlet, and the second cold plate has the other of a liquid inlet and a liquid outlet. The first cold plate has a first chamber, and the second cold plate has a second chamber, which are connected. The first cold plate is disposed between two adjacent individual cells and is thermally connected to the two adjacent individual cells. The second cold plate is disposed on one side of the individual cell along a third direction and is thermally connected to the two adjacent individual cells.

[0009] In some embodiments, the first cold plate is provided with a liquid inlet end, and the second cold plate is provided with a liquid outlet end. The first cold plate includes a plate body and a first manifold connected to each other. The first manifold is connected to the liquid inlet end. The plate body is provided with a first chamber. The first manifold is connected to the first chamber and the second chamber. The liquid outlet end is connected to the second chamber.

[0010] In some embodiments, the first cold plate includes a second manifold, which has a liquid inlet end. The second manifold is connected to the side of the plate body away from the first manifold and to the side of the second cold plate facing the first cold plate. The second manifold connects the first chamber and the liquid inlet end.

[0011] In some embodiments, the plate body includes a plurality of partitions disposed in a first chamber and spaced apart along a third direction. The plurality of partitions divide the first chamber into a plurality of flow channels, which are respectively connected to a first manifold and a second manifold.

[0012] In some embodiments, the second cold plate includes a first housing and a second housing, which together form a second chamber. The first housing is connected to a first manifold, the first housing has a first opening, and the first manifold has a second opening on the side facing the first housing. The first opening and the second opening communicate with each other, and the first chamber and the second chamber communicate with each other through the first opening and the second opening.

[0013] In some embodiments, the first cold plate includes a plate body, the plate body is provided with a first cavity, and the maximum thickness of the plate body along the second direction is A mm, satisfying: 1≤A≤10.

[0014] In some embodiments, the battery pack includes:

[0015] The housing includes a side panel and a bottom plate connected to the side panel, the side panel and the bottom plate forming a receiving cavity; a first cold plate is disposed between two adjacent single cells and is thermally connected to the two adjacent single cells; a second cold plate is disposed between the single cell and the bottom plate and is thermally connected to the single cell and the bottom plate respectively.

[0016] In some embodiments, the battery pack has a first direction that intersects with the second direction and the third direction respectively. The battery pack includes a first end plate and a second end plate, which are located in the receiving cavity. The first end plate and the second end plate are respectively connected to the side of the second cold plate facing the first cold plate. The first end plate and the second end plate are spaced apart along the first direction and enclose the second cold plate and the side plate to form a receiving space. Multiple individual batteries are located in the receiving space.

[0017] In some embodiments, the battery pack includes a first end plate and a second end plate. The first end plate is disposed between a first current collector and a single cell and is connected to the first current collector and the single cell respectively. The first end plate has a first limiting groove, and the plate body is embedded in the first limiting groove. The second end plate is disposed between a second current collector and a single cell and is connected to the second current collector and the single cell respectively. The second end plate has a second limiting groove, and the plate body is embedded in the second limiting groove.

[0018] In some embodiments, the battery pack includes a first end plate and a second end plate. The first end plate is connected to the side of the first current collector away from the individual battery cell. The second end plate is disposed between the second current collector cell and the individual battery cell and is connected to the second current collector cell and the individual battery cell cell respectively. The second end plate is provided with a second limiting groove, and the plate body is embedded in the second limiting groove.

[0019] In some embodiments, the battery pack has a first direction intersecting a second direction and a third direction respectively, a plurality of individual cells are arranged along the first direction, a plurality of liquid cooling components are provided, the plurality of liquid cooling components are spaced apart along the second direction and are thermally connected to the plurality of individual cells adjacent to the first direction, the liquid inlet ends of the plurality of liquid cooling components are interconnected, and the liquid outlet ends of the plurality of liquid cooling components are interconnected.

[0020] Accordingly, this application provides an electrical device including the battery pack described above.

[0021] Beneficial Effects: This application provides a battery pack with intersecting second and third directions. The battery pack includes multiple individual cells and a liquid cooling assembly. The multiple individual cells are arranged along the second direction. The liquid cooling assembly includes a first cold plate and a second cold plate connected to each other. The first cold plate has one of a liquid inlet and a liquid outlet, and the second cold plate has the other of a liquid inlet and a liquid outlet. The first cold plate has a first chamber, and the second cold plate has a second chamber, which are connected. The first cold plate is disposed between two adjacent individual cells and is thermally connected to the two adjacent individual cells. The second cold plate is disposed on one side of the individual cell along the third direction and is thermally connected to the two adjacent individual cells. Coolant flows through the first and second cold plates through the liquid inlet and liquid outlet to exchange heat with the individual cells. The first and second cold plates are in contact with adjacent individual cells, which can quickly and evenly remove heat from the surface of the individual cells. The liquid inlet and liquid outlet of the first and second cold plates respectively can improve cooling efficiency.

[0022] The electrical device in this application includes the battery pack described above. Therefore, the electrical device can have all the technical features and beneficial effects of the battery pack described above, which will not be repeated here. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 is a schematic diagram of the structure of a first type of battery pack according to an embodiment of this application;

[0025] Figure 2 is a schematic diagram of the structure of a second type of battery pack according to an embodiment of this application;

[0026] Figure 3 is an exploded view of the second type of battery pack according to an embodiment of this application;

[0027] Figure 4 is a schematic diagram of the structure of a liquid cooling component according to an embodiment of this application;

[0028] Figure 5 is an exploded view of a liquid cooling component according to an embodiment of this application;

[0029] Figure 6 is an exploded cross-sectional view of a first liquid cooling assembly according to an embodiment of this application;

[0030] Figure 7 is an exploded cross-sectional view of a second type of liquid cooling component according to an embodiment of this application.

[0031] Reference numerals: 1. Single cell; 2. Liquid cooling assembly; 3. Housing; 4. First end plate; 5. Second end plate; 6. Receiving space; 20. First cold plate; 21. Second cold plate; 22. Liquid inlet; 23. Liquid outlet; 30. Bottom plate; 31. Side plate; 32. Receiving cavity; 40. First limiting groove; 50. Second limiting groove; 200. First chamber; 201. Plate body; 202. First manifold; 203. Second manifold; 210. Second chamber; 211. First housing; 212. Second housing; 2000. Flow channel; 2010. Separator; 2020. Second opening; 2110. First opening; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0033] In the description of this application, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, and "at least one" can mean one, two, or more, unless otherwise explicitly specified. In the description of this application, "perpendicular" means completely perpendicular to 90° or almost completely perpendicular, for example, the range of included angles from 80° to 100° is considered perpendicular. Similarly, "parallel" means completely parallel or almost completely parallel, for example, the range of completely parallel angles from 10° is considered parallel.

[0034] Currently, pure electric new energy vehicles have increasingly higher requirements for driving range, thus demanding higher battery energy density and space utilization. While increasing battery pack energy density, higher charge / discharge rates are also being implemented. Since battery heat generation is related to cell internal resistance, and the charge / discharge rate is related to the battery pack's energy, as the battery pack energy and charge / discharge rate increase, so too does the battery generate heat. Excessive heat accumulation within the battery pack can lead to rapid temperature rise and the risk of thermal runaway. Liquid cooling devices in related technologies are typically located at the bottom of the battery pack, resulting in ineffective cooling.

[0035] In view of this, embodiments of this application provide a battery pack having intersecting second and third directions. The battery pack includes multiple individual cells and a liquid cooling assembly. The multiple individual cells are arranged along the second direction. The liquid cooling assembly includes a first cold plate and a second cold plate connected together. The first cold plate is provided with one of a liquid inlet and a liquid outlet, and the second cold plate is provided with the other of a liquid inlet and a liquid outlet. The first cold plate has a first chamber, and the second cold plate has a second chamber, which are connected. The first cold plate is disposed between two adjacent individual cells and is thermally connected to the two adjacent individual cells. The second cold plate is disposed on one side of the individual cell along the third direction and is thermally connected to the two adjacent individual cells. Coolant flows through the first and second cold plates through the liquid inlet and liquid outlet to exchange heat with the individual cells. The first and second cold plates are in contact with adjacent individual cells, which can quickly and evenly remove heat from the surface of the individual cells. The liquid inlet and liquid outlet of the first and second cold plates can improve cooling efficiency.

[0036] The battery pack and power supply device of this application will now be described in detail with reference to the accompanying drawings. Unless otherwise specified, the features of the following embodiments and implementations can be combined with each other.

[0037] Figure 1 is a schematic diagram of the structure of a first type of battery pack according to an embodiment of this application; Figure 2 is a schematic diagram of the structure of a second type of battery pack according to an embodiment of this application; Figure 3 is an exploded view of the second type of battery pack according to an embodiment of this application; Figure 4 is a schematic diagram of the structure of a liquid cooling component 2 according to an embodiment of this application; Figure 5 is an exploded view of a liquid cooling component 2 according to an embodiment of this application; Figure 6 is a cross-sectional view of the exploded view of the first type of liquid cooling component 2 according to an embodiment of this application; Figure 7 is a cross-sectional view of the exploded view of the second type of liquid cooling component 2 according to an embodiment of this application.

[0038] Referring to Figures 1 to 7, this application embodiment provides a battery pack having intersecting second direction Y and third direction Z. Optionally, the second direction can be the width direction of the battery pack, and the third direction can be the height direction of the battery pack. The battery pack includes multiple individual cells 1 and a liquid cooling assembly 2. The multiple individual cells 1 are arranged along the second direction Y. The liquid cooling assembly 2 includes a first cold plate 20 and a second cold plate 21 connected to each other. The first cold plate 20 is provided with one of a liquid inlet end 22 and a liquid outlet end 23, and the second cold plate 21 is provided with the other of the liquid inlet end 22 and the liquid outlet end 23. The first cold plate 20 is provided with a first chamber 200, and the second cold plate 21 is provided with a second chamber 210. The first chamber 200 and the second chamber 210 are connected. The first cold plate 20 is disposed between two adjacent individual cells 1 and is thermally connected to the two adjacent individual cells 1. The second cold plate 21 is disposed on one side of the individual cell 1 along the third direction Z and is thermally connected to the two adjacent individual cells 1. The coolant flows through the inlet end 22 and the outlet end 23 through the first chamber 200 of the first cold plate 20 and the second chamber 210 of the second cold plate 21 to exchange heat with the contacting individual cells 1. The first cold plate 20 and the second cold plate 21 are in contact with adjacent individual cells 1, which can quickly and evenly remove heat from the surface of the individual cells 1. The inlet end 22 and the outlet end 23 of the first cold plate 20 and the second cold plate 21 are respectively provided to simplify the flow path of the coolant and reduce the residence time of the coolant in the liquid cooling assembly 2, thereby helping to improve the cooling efficiency.

[0039] In some embodiments, the first cold plate 20 includes a plate body 201 and a first manifold 202 connected together. The plate body 201 is provided with a first chamber 200, and the first manifold 202 connects the first chamber 200 and a second chamber 210. The first cold plate 20 also includes a second manifold 203, which is connected to the side of the plate body 201 away from the first manifold 202 and to the side of the second cold plate 21 facing the first cold plate 20.

[0040] In some embodiments, the second manifold 203 is connected to the first chamber 200. The second manifold 203 is provided with an outlet end 23, and the second cold plate 21 is provided with an inlet end 22. The coolant enters the second chamber 210 through the inlet end 22 and flows to the first chamber 200 through the first manifold 202. Finally, it flows out through the outlet end 23 of the second manifold 203. This configuration simplifies the flow path of the coolant and reduces the residence time of the coolant in the liquid cooling assembly 2, thereby helping to improve the cooling efficiency.

[0041] In other embodiments, the second manifold 203 connects to the first chamber 200. The second manifold 203 is provided with an inlet end 22, and the second cold plate 21 is provided with an outlet end 23, as shown in Figures 4 and 5. The coolant enters the second manifold 203 and the first chamber 200 connected to the second manifold 203 through the inlet end 22, flows to the second chamber 210 through the first manifold 202, and finally flows out through the outlet end 23. This arrangement simplifies the flow path of the coolant and reduces the residence time of the coolant in the liquid cooling assembly 2, thereby helping to improve the cooling efficiency.

[0042] In the embodiments shown in Figures 6 and 7, the battery pack has a third direction Z intersecting the first direction X and the second direction Y, respectively. The third direction Z can be the length direction of the first manifold 202 and the second manifold 203. The plate body 201 includes multiple partitions 2010, which are disposed within the first chamber 200 and spaced apart along the third direction Z. The partitions 2010 divide the first chamber 200 into multiple flow channels 2000, which are respectively connected to the first manifold 202 and the second manifold 203. When the coolant enters the first chamber, it can be diverted to the multiple flow channels 2000, thereby increasing the contact area with the individual battery cells 1 and making it easier for the heat from the individual battery cells 1 to be transferred to the coolant. Increasing the contact area improves the efficiency of heat transfer, helps avoid localized overheating of the individual battery cells 1, and thus enhances the cooling effect of the coolant on the individual battery cells 1.

[0043] In the embodiment shown in Figure 7, the first cold plate 20 includes a plate body 201, which has a first chamber 200. The maximum thickness of the plate body 201 along the second direction Y is A mm, satisfying: 1 ≤ A ≤ 10. Specifically, the maximum thickness of the plate body 201 along the second direction Y can be any value or any two values ​​from 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, and 10 mm. By limiting the maximum thickness of the plate body 201 along the second direction Y, the cooling effect of the coolant on the individual battery cells 1 can be improved while reducing the space occupied by the first cold plate 20, which helps to arrange more individual battery cells 1 and improve the battery pack assembly rate.

[0044] In the embodiment shown in FIG5, the second cold plate 21 includes a first shell 211 and a second shell 212. The first shell 211 and the second shell 212 enclose a second chamber 210. The first shell 211 is connected to the first manifold 202. The first shell 211 is provided with a first opening 2110. The first manifold 202 is provided with a second opening 2020 on the side facing the first shell 211. The first opening 2110 and the second opening 2020 communicate with each other. The first chamber 200 and the second chamber 210 communicate with each other through the first opening 2110 and the second opening 2020. In the embodiments of this application, the first housing 211 and the second housing 212 are welded together, and the first housing 211 and the first manifold 202 are welded together. By providing a first opening 2110 on the first housing 211 and a second opening 2020 corresponding to the first opening 2110 on the first manifold 202, the first chamber 200 and the second chamber 210 can be connected. The structure is simple and can promote the circulation of coolant in the first chamber 200 and the second chamber 210, thereby helping to enhance the heat exchange effect and improve the cooling effect.

[0045] In the embodiments shown in Figures 6 and 7, the second housing 212 is stamped along the third direction Z to form multiple flow channels 2100. When the coolant enters the second cavity, it can be diverted to the multiple flow channels 2100, thereby increasing the contact area with the individual battery 1 and making it easier for the heat of the individual battery 1 to be transferred to the coolant. Increasing the contact area can improve the efficiency of heat transfer, avoid local overheating of the individual battery 1, and thus help enhance the cooling effect of the coolant on the individual battery 1.

[0046] In the embodiments shown in Figures 1 to 3, the battery pack includes a housing 3, which includes a side plate 31 and a bottom plate 30 connected to the side plate 31. The side plate 31 and the bottom plate 30 form a receiving cavity 32. A first cold plate 20 is disposed between two adjacent individual cells 1 and is thermally connected to the two adjacent individual cells 1. The first cold plate 20 disposed between two adjacent individual cells 1 can increase the contact area with the individual cells 1 and improve the efficiency of heat transfer. A second cold plate 21 is disposed between the individual cells 1 and the bottom plate 30 and is thermally connected to both the individual cells 1 and the bottom plate 30. A second shell 212 is formed by stamping and the second cold plate 21 is formed by welding to the second shell 212. The second cold plate 21 has a certain load-bearing capacity. By using the second cold plate 21 to support the individual cells 1, the thickness of the bottom plate 30 of the battery pack can be reduced, thereby reducing the weight of the battery pack and improving the space utilization rate inside the battery pack.

[0047] In the embodiments shown in Figures 1 to 3, the battery pack includes a first end plate 4 and a second end plate 5, located within a receiving cavity 32. The first end plate 4 and the second end plate 5 are respectively connected to the side of the second cold plate 21 facing the first cold plate 20. The first end plate 4 and the second end plate 5 are spaced apart along a first direction X, and together with the second cold plate 21 and the side plate 31, they enclose a receiving space 6, within which multiple individual batteries 1 are located. The first end plate 4 and the second end plate 5 serve as limiting elements, separating the receiving cavity 32 to form the receiving space 6 for accommodating individual batteries 1. The liquid inlet end 22 and the liquid outlet end 23 are located outside the receiving space 6, facilitating connection to a liquid supply device (not shown).

[0048] In the embodiment shown in Figure 1, the battery pack includes a first end plate 4 and a second end plate 5. The first end plate 4 is connected to the side of the first current collector 202 away from the individual battery 1. The first end plate 4 has a simple structure and can provide a certain limiting effect on the first cold plate 20. The second end plate 5 is disposed between the second current collector 203 and the individual battery 1 and is connected to both the second current collector 203 and the individual battery 1 respectively. The second end plate 5 is provided with a second limiting groove 50, and the plate body 201 is embedded in the second limiting groove 50. The second end plate 5 is connected to the plate body 201 through the provided second limiting groove 50, which can improve the stability of the connection.

[0049] In the embodiments shown in Figures 2 and 3, the battery pack includes a first end plate 4 and a second end plate 5. The first end plate 4 is disposed between the first current collector 202 and the single cell 1 and is connected to both the first current collector 202 and the single cell 1. The first end plate 4 has a first limiting groove 40, and the plate body 201 is embedded in the first limiting groove 40. The second end plate 5 is disposed between the second current collector 203 and the single cell 1 and is connected to both the second current collector 203 and the single cell 1. The second end plate 5 has a second limiting groove 50, and the plate body 201 is embedded in the second limiting groove 50. In the embodiments of this application, the first end plate 4 is connected to the plate body 201 through the first limiting groove 40, and the second end plate 5 is connected to the plate body 201 through the second limiting groove 50, which can further improve the stability of the connection.

[0050] In the embodiment shown in Figure 1, multiple individual battery cells 1 can be arranged along a first direction X. Optionally, the second direction Y can be the width direction of the battery pack, the third direction Z can be the height direction of the battery pack, and the first direction X can be the length direction of the battery pack. Multiple liquid cooling components 2 are provided, spaced apart along the second direction Y and thermally connected to adjacent individual battery cells 1 along the first direction X. The liquid inlet ends 22 of the multiple liquid cooling components 2 are interconnected, and the liquid outlet ends 23 of the multiple liquid cooling components 2 are interconnected. By providing multiple liquid cooling components 2, the contact area between the liquid cooling components 2 and the individual battery cells 1 can be effectively increased, thereby helping to effectively improve cooling efficiency. Connecting the multiple liquid inlet ends 22 and the multiple liquid outlet ends 23 interconnects forms a continuous coolant circulation path, allowing the coolant to flow between the multiple liquid cooling components 2. This simplifies the structure of the liquid supply system and reduces the maintenance and management costs of the cooling system.

[0051] This application provides an electrical device including the aforementioned battery pack. The battery pack provides power to the electrical device. The electrical device can be a mobile phone, portable device, laptop, electric vehicle, electric car, ship, spacecraft, electric toy, or power tool. For example, 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.

[0052] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0053] The battery pack and power device provided in the embodiments of this application have been described in detail above, and specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and 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.

Claims

1. A battery pack, wherein, Having intersecting second direction (Y) and third direction (Z), the battery pack includes: Multiple individual cells (1) are arranged along the second direction (Y); The liquid cooling assembly (2) includes a first cold plate (20) and a second cold plate (21) connected to each other; The first cold plate (20) is provided with one of a liquid inlet end (22) and a liquid outlet end (23), and the second cold plate (21) is provided with the other of the liquid inlet end (22) and the liquid outlet end (23); The first cold plate (20) is provided with a first chamber (200), and the second cold plate (21) is provided with a second chamber (210). The first chamber (200) and the second chamber (210) are connected. The first cold plate (20) is disposed between two adjacent single cells (1) and is thermally connected to the two adjacent single cells (1). The second cold plate (21) is disposed on one side of the single cell (1) along the third direction (Z) and is thermally connected to the two adjacent single cells (1).

2. The battery pack according to claim 1, wherein, The first cold plate (20) is provided with a liquid inlet end (22), and the second cold plate (21) is provided with a liquid outlet end (23); The first cold plate (20) includes a plate body (201) and a first manifold (202) connected to each other. The first manifold (202) is connected to the liquid inlet (22). The plate body (201) is provided with a first chamber (200). The first manifold (202) connects the first chamber (200) and the second chamber (210). The liquid outlet (23) is connected to the second chamber (210).

3. The battery pack according to claim 2, wherein, The first cold plate (20) includes a second manifold (203); The second manifold (203) is provided with the liquid inlet end (22). The second manifold (203) is connected to the side of the plate body (201) away from the first manifold (202) and to the side of the second cold plate (21) facing the first cold plate (20). The second manifold (203) connects the first chamber (200) and the liquid inlet end (22).

4. The battery pack according to claim 3, wherein, The plate body (201) includes multiple partitions (2010); Multiple partitions (2010) are disposed in the first chamber (200) and spaced apart along the third direction (Z). The multiple partitions (2010) divide the first chamber (200) into multiple flow channels (2000), and the multiple flow channels (2000) are respectively connected to the first manifold (202) and the second manifold (203).

5. The battery pack according to claim 2, wherein, The second cold plate (21) includes a first shell (211) and a second shell (212); The first housing (211) and the second housing (212) enclose and form the second chamber (210). The first housing (211) is connected to the first manifold (202). The first housing (211) has a first opening (2110). The first manifold (202) has a second opening (2020) on the side facing the first housing (211). The first opening (2110) communicates with the second opening (2020). The first chamber (200) and the second chamber (210) communicate through the first opening (2110) and the second opening (2020).

6. The battery pack according to claim 5, wherein, The second housing (212) forms a plurality of branch channels (2100) along the third direction (Z).

7. The battery pack according to claim 5, wherein, The first housing (211) and the second housing (212) are connected by welding.

8. The battery pack according to claim 1, wherein, The first cold plate (20) and the second cold plate (21) are connected by welding.

9. The battery pack according to claim 1, wherein, The first cold plate (20) includes a plate body (201); The plate body (201) is provided with the first chamber (200), and the maximum thickness of the plate body (201) along the second direction (Y) is A mm, satisfying: 1≤A≤10.

10. The battery pack according to claim 1, wherein, The battery pack includes: The housing (3) includes a side plate (31) and a bottom plate (30) connected to the side plate (31), the side plate (31) and the bottom plate (30) forming a receiving cavity (32); The first cold plate (20) is disposed between two adjacent single cells (1) and is thermally connected to the two adjacent single cells (1); The second cold plate (21) is disposed between the single cell (1) and the base plate (30), and is thermally connected to the single cell (1) and the base plate (30) respectively.

11. The battery pack according to claim 10, wherein, The battery pack has a first direction (X) that intersects the second direction (Y) and the third direction (Z) respectively; The battery pack includes a first end plate (4) and a second end plate (5) located in the receiving cavity (32). The first end plate (4) and the second end plate (5) are respectively connected to the side of the second cold plate (21) facing the first cold plate (20). The first end plate (4) and the second end plate (5) are spaced apart along the first direction (X) and together with the second cold plate (21) and the side plate (31) form a receiving space (6). A plurality of the individual batteries (1) are located in the receiving space (6).

12. The battery pack according to claim 11, wherein, The liquid inlet (22) and the liquid outlet (23) are located outside the accommodating space (6).

13. The battery pack according to claim 3, wherein, The battery pack includes a first end plate (4) and a second end plate (5); The first end plate (4) is disposed between the first current collector (202) and the single cell (1) and is connected to the first current collector (202) and the single cell (1) respectively. The first end plate (4) is provided with a first limiting groove (40), and the plate body (201) is embedded in the first limiting groove (40). The second end plate (5) is disposed between the second current collector (203) and the single cell (1) and is connected to the second current collector (203) and the single cell (1) respectively. The second end plate (5) is provided with a second limiting groove (50), and the plate body (201) is embedded in the second limiting groove (50).

14. The battery pack according to claim 3, wherein, The battery pack includes a first end plate (4) and a second end plate (5); The first end plate (4) is connected to the side of the first current collector (202) away from the single cell (1); The second end plate (5) is disposed between the second current collector (203) and the single cell (1) and is connected to the second current collector (203) and the single cell (1) respectively. The second end plate (5) is provided with a second limiting groove (50), and the plate body (201) is embedded in the second limiting groove (50).

15. The battery pack according to claim 1, wherein, The battery pack has a first direction (X) that intersects the second direction (Y) and the third direction (Z) respectively; The plurality of said individual cells (1) are arranged along the first direction (X); The number of liquid cooling components (2) is multiple. Multiple liquid cooling components (2) are arranged at intervals along the second direction (Y) and are thermally connected to multiple single cells (1) adjacent to the first direction (X). The liquid inlet ends (22) of multiple liquid cooling components (2) are connected to each other, and the liquid outlet ends (23) of multiple liquid cooling components (2) are connected to each other.

16. The battery pack according to claim 1, wherein, The first cold plate (20) is provided with a liquid outlet (23), and the second cold plate (21) is provided with a liquid inlet (22); The first cold plate (20) includes a plate body (201) and a first manifold (202) connected to each other. The first manifold (202) is connected to the liquid outlet (23). The plate body (201) is provided with a first chamber (200). The first manifold (202) connects the first chamber (200) and the second chamber (210). The liquid inlet (22) is connected to the second chamber (210).

17. The battery pack according to claim 16, wherein, The first cold plate (20) includes a second manifold (203); The second manifold (203) is provided with the liquid outlet (23). The second manifold (203) is connected to the side of the plate body (201) away from the first manifold (202) and to the side of the second cold plate (21) facing the first cold plate (20). The second manifold (203) connects the first chamber (200) and the liquid outlet (23).

18. The battery pack according to claim 1, wherein, The first cold plate (20) is inserted between two adjacent single cells (1), and the second cold plate (21) is supported at the bottom of the single cell (1).

19. The battery pack according to claim 11, wherein, The number of liquid cooling components (2) is multiple, and the multiple liquid cooling components (2) are spaced apart along the second direction (Y) and are thermally connected to the multiple single cells (1) adjacent to each other in the first direction (X); The liquid inlet (22) of the plurality of liquid cooling components (2) are interconnected, and the liquid outlet (23) of the plurality of liquid cooling components (2) are interconnected.

20. An electrical appliance, wherein, The battery pack includes any one of claims 1-19.

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