Battery pack and electric device

Abstract

The utility model discloses a battery pack and a power utilization device, and belongs to the technical field of batteries, and the battery pack comprises a plurality of single batteries and a liquid cooling assembly. The plurality of single batteries are arranged along a second direction. The liquid cooling assembly comprises a first cooling plate and a second cooling plate which are connected, the first cooling plate is provided with one of a liquid inlet end and a liquid outlet end, and the second cooling plate is provided with the other of the liquid inlet end and the liquid outlet end. The first cold plate is provided with a first chamber, the second cold plate is provided with a second chamber, and the first chamber is communicated with the second chamber; the first cold plate is arranged between two adjacent single batteries and is in heat conduction connection with the two adjacent single batteries, and the second cold plate is arranged on one side of the single batteries along the third direction and is in heat conduction connection with the two adjacent single batteries. Cooling liquid flows through the first cold plate and the second cold plate through the liquid inlet end and the liquid outlet end so as to realize heat exchange with the single battery, and heat on the surface of the single battery can be quickly and uniformly taken away. The first cold plate and the second cold plate are provided with the liquid inlet end and the liquid outlet end correspondingly, and the cooling efficiency can be improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and particularly relates to a battery pack and a power utilization device. BACKGROUND

[0002] At present, new energy vehicles with pure electric drive have higher and higher requirements for the endurance mileage, so the requirements for the energy density of batteries and the space utilization rate are also higher and higher. While improving the energy density of the battery pack, the charge-discharge rate of the battery is higher. Due to the heat generation of the battery and the internal resistance of the battery cell, the charge-discharge rate is related to the energy of the battery pack. With the increase of the energy of the battery pack and the charge-discharge rate, the heat generation of the battery is also more and more. If too much heat is gathered in the battery pack, the temperature of the battery pack will rise too fast, and there is a risk of thermal runaway. The liquid cooling device in the related technology is usually arranged at the bottom of the battery pack, and the cooling effect is poor. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims at solving the technical problem of poor cooling effect of the liquid cooling assembly.

[0004] TECHNICAL SCHEME: The utility model provides a battery pack, which has a second direction and a third direction intersecting with each other, and comprises:

[0005] a plurality of single batteries arranged along the second direction;

[0006] a liquid cooling assembly comprising a first cold plate and a second cold plate connected with each other, the first cold plate being provided with one of an inlet end and an outlet end, and the second cold plate being provided with the other one of the inlet end and the outlet end. The first cold plate is provided with a first chamber, the second cold plate is provided with a second chamber, and the first chamber and the second chamber are communicated. The first cold plate is arranged between two adjacent single batteries and is in heat-conducting connection with the two adjacent single batteries, and the second cold plate is arranged on one side of the single batteries along the third direction and is in heat-conducting connection with the two adjacent single batteries.

[0007] In some embodiments, the first cold plate is provided with the inlet end, the second cold plate is provided with the outlet end, the first cold plate comprises a plate body and a first flow collector connected with each other, the first flow collector is communicated with the inlet end, the plate body is provided with the first chamber, the first flow collector communicates the first chamber and the second chamber, and the outlet end is communicated with the second chamber.

[0008] In some embodiments, the first cold plate comprises a second flow collector, the second flow collector is provided with the inlet end, the second flow collector is connected with one side of the plate body away from the first flow collector and connected with one side of the second cold plate facing the first cold plate, and the second flow collector communicates the first chamber and the inlet end.

[0009] In some embodiments, the plate body includes a plurality of partitions disposed in the first chamber and spaced apart along the third direction, the plurality of partitions separating the first chamber into a plurality of flow channels, the plurality of flow channels being in communication with the first manifold and the second manifold, respectively.

[0010] In some embodiments, the second cold plate includes a first shell and a second shell, the first shell and the second shell enclosing a second chamber, the first shell being connected to the first manifold, the first shell being provided with a first opening, the side of the first manifold facing the first shell being provided with a second opening, the first opening being in communication with the second opening, the first chamber and the second chamber being in communication through the first opening and the second opening.

[0011] In some embodiments, the first cold plate includes a plate body provided with a first chamber, the maximum thickness of the plate body along the second direction being A mm, satisfying: 1≤A≤10.

[0012] In some embodiments, the battery pack includes:

[0013] The box includes a side plate and a bottom plate connected to the side plate, the side plate and the bottom plate enclosing a receiving cavity; the first cold plate is arranged between the adjacent two single batteries and is in thermal conductive connection with the adjacent two single batteries, and the second cold plate is arranged between the single battery and the bottom plate and is in thermal conductive connection with the single battery and the bottom plate, respectively.

[0014] In some embodiments, the battery pack has a first direction intersecting the second direction and the third direction, respectively, and includes a first end plate and a second end plate located in the receiving cavity, the first end plate and the second end plate being connected to the side of the second cold plate facing the first cold plate, respectively, the first end plate and the second end plate being spaced apart along the first direction and enclosing a receiving space with the second cold plate and the side plate, and the plurality of single batteries being located in the receiving space.

[0015] In some embodiments, the battery pack includes a first end plate and a second end plate, the first end plate being arranged between the first manifold and the single battery and being connected to the first manifold and the single battery, respectively, the first end plate being provided with a first limiting groove, and the plate body being embedded in the first limiting groove; the second end plate being arranged between the second manifold and the single battery and being connected to the second manifold and the single battery, respectively, the second end plate being provided with a second limiting groove, and the plate body being embedded in the second limiting groove.

[0016] In some embodiments, the battery pack includes a first end plate and a second end plate, the first end plate being connected to the side of the first manifold away from the single battery; the second end plate being arranged between the second manifold and the single battery and being connected to the second manifold and the single battery, respectively, the second end plate being provided with a second limiting groove, and the plate body being embedded in the second limiting groove.

[0017] In some embodiments, the battery pack has a first direction intersecting with a second direction and a third direction, a plurality of single batteries arranged along the first direction, a plurality of liquid cooling assemblies, the plurality of liquid cooling assemblies are arranged along the second direction (Y) and are in heat conduction connection with the plurality of single batteries adjacent to the first direction, the liquid inlet ends of the plurality of liquid cooling assemblies are connected to each other, and the liquid outlet ends of the plurality of liquid cooling assemblies are connected to each other.

[0018] Correspondingly, the application provides a power consumption device comprising the battery pack.

[0019] Beneficial effects: the application provides a battery pack with a second direction and a third direction intersecting with each other, and the battery pack comprises a plurality of single batteries and a liquid cooling assembly. The plurality of single batteries are arranged along the second direction. The liquid cooling assembly comprises a first cooling plate and a second cooling plate connected to each other, the first cooling plate is provided with one of the liquid inlet end and the liquid outlet end, and the second cooling plate is provided with the other one of the liquid inlet end and the liquid outlet end. The first cooling plate is provided with a first cavity, the second cooling plate is provided with a second cavity, and the first cavity and the second cavity are communicated; the first cooling plate is arranged between two adjacent single batteries and is in heat conduction connection with the two adjacent single batteries, and the second cooling plate is arranged on one side of the single batteries along the third direction and is in heat conduction connection with the two adjacent single batteries. The cooling liquid flows through the first cooling plate and the second cooling plate through the liquid inlet end and the liquid outlet end to realize heat exchange with the single batteries, and the first cooling plate and the second cooling plate are respectively in contact with the adjacent single batteries, so that the heat on the surface of the single batteries can be quickly and uniformly taken away. The first cooling plate and the second cooling plate are respectively provided with the liquid inlet end and the liquid outlet end, so that the cooling efficiency can be improved.

[0020] The power consumption device of the application comprises the battery pack, so the power consumption device can have all the technical features and beneficial effects of the battery pack, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Figure 1 is a structural schematic diagram of a first battery pack of the application;

[0023] Figure 2 is a structural schematic diagram of a second battery pack of the application;

[0024] Figure 3 is an exploded view of the second battery pack of the application;

[0025] Figure 4is a structural schematic diagram of a liquid cooling assembly according to an embodiment of the present application;

[0026] Figure 5 is an exploded view of a liquid cooling assembly according to an embodiment of the present application;

[0027] Figure 6 is a cross-sectional view of the exploded view of the first liquid cooling assembly according to an embodiment of the present application;

[0028] Figure 7 is a cross-sectional view of the exploded view of the second liquid cooling assembly according to an embodiment of the present application.

[0029] Fig. 1 is a single battery; Fig. 2 is a liquid cooling assembly; Fig. 3 is a box body; Fig. 4 is a first end plate; Fig. 5 is a second end plate; Fig. 6 is a containing space; Fig. 20 is a first cold plate; Fig. 21 is a second cold plate; Fig. 22 is an inlet end; Fig. 23 is an outlet end; Fig. 30 is a bottom plate; Fig. 31 is a side plate; Fig. 32 is a containing cavity; Fig. 40 is a first limiting groove; Fig. 50 is a second limiting groove; Fig. 200 is a first chamber; Fig. 201 is a plate body; Fig. 202 is a first manifold; Fig. 203 is a second manifold; Fig. 210 is a second chamber; Fig. 211 is a first shell; Fig. 212 is a second shell; Fig. 2000 is a flow channel; Fig. 2010 is a partition; Fig. 2020 is a second opening; Fig. 2110 is a first opening; X is a first direction; Y is a second direction; Z is a third direction. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person skilled in the art without creative work fall within the scope of protection of the present application.

[0031] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, at least one of which can be one, two or more, unless otherwise explicitly specified. In the description of the present application, "vertical" means completely vertical at 90° or almost completely vertical, for example, within an angle range of 80°-100°, it is considered as vertical, similarly, "parallel" means completely parallel or almost completely parallel, for example, within a range of 10° of complete parallel, it is considered as parallel.

[0032] At present, the demand for endurance mileage of pure electric new energy vehicles is getting higher and higher, so the demand for energy density of batteries is getting higher and higher, and the demand for space utilization rate is getting higher and higher. While improving the energy density of the battery pack, the charging and discharging rate of the battery is higher. Due to the heat generation of the battery and the internal resistance of the battery cell, the charging and discharging rate is related to the energy of the battery pack. With the increase of the energy of the battery pack and the charging and discharging rate, the heat generation of the battery is also increasing. If too much heat is accumulated in the battery pack, it will cause the temperature of the battery pack to rise too fast, and there is a risk of thermal runaway. The liquid cooling device in the related art is usually arranged at the bottom of the battery pack, and the cooling effect is not good.

[0033] Therefore, the embodiments of the present application provide a battery pack with intersecting second and third directions, the battery pack comprising a plurality of single batteries and a liquid cooling assembly. The plurality of single batteries are arranged along the second direction. The liquid cooling assembly comprises a first cooling plate and a second cooling plate connected together, the first cooling plate is provided with one of an inlet end and an outlet end, and the second cooling plate is provided with the other one of the inlet end and the outlet end. The first cooling plate is provided with a first chamber, the second cooling plate is provided with a second chamber, and the first chamber and the second chamber are communicated; the first cooling plate is arranged between two adjacent single batteries and is in thermal conductive connection with the two adjacent single batteries, and the second cooling plate is arranged on one side of the single batteries along the third direction and is in thermal conductive connection with the two adjacent single batteries. The cooling liquid flows through the first cooling plate and the second cooling plate through the inlet end and the outlet end to realize heat exchange with the single batteries, and the first cooling plate and the second cooling plate are respectively in contact with the adjacent single batteries, so that the heat on the surface of the single batteries can be quickly and uniformly taken away. The first cooling plate and the second cooling plate are respectively provided with the inlet end and the outlet end, so that the cooling efficiency can be improved.

[0034] The battery pack and the electric device according to the present application will be described in detail below with reference to the accompanying drawings. The features in the following embodiments and examples can be combined with each other without conflict.

[0035] Figure 1 is a structural schematic diagram of a first battery pack according to an embodiment of the present application; Figure 2 is a structural schematic diagram of a second battery pack according to an embodiment of the present application; Figure 3 is an exploded view of the second battery pack according to an embodiment of the present application;

[0036] Figure 4 is a structural schematic diagram of a liquid cooling assembly 2 according to an embodiment of the present application; Figure 5 is an exploded view of the liquid cooling assembly 2 according to an embodiment of the present application; Figure 6 is a sectional view of the exploded view of the first liquid cooling assembly 2 according to an embodiment of the present application; Figure 7 is a sectional view of the exploded view of the second liquid cooling assembly 2 according to an embodiment of the present application.

[0037] With reference to Figures 1 to 7 , the present application provides a battery pack having a second direction Y and a third direction Z intersecting with each other. 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 comprises a plurality of single batteries 1 and a liquid cooling assembly 2. The plurality of single batteries 1 are arranged along the second direction Y. The liquid cooling assembly 2 comprises a first cooling plate 20 and a second cooling plate 21 connected with each other. The first cooling plate 20 is provided with one of an inlet end 22 and an outlet end 23, and the second cooling plate 21 is provided with the other one of the inlet end 22 and the outlet end 23. The first cooling plate 20 is provided with a first chamber 200, and the second cooling plate 21 is provided with a second chamber 210. The first chamber 200 and the second chamber 210 are in communication. The first cooling plate 20 is arranged between two adjacent single batteries 1 and is in thermal conductive connection with the two adjacent single batteries 1. The second cooling plate 21 is arranged on one side of the single batteries 1 along the third direction Z and is in thermal conductive connection with the two adjacent single batteries 1. The cooling liquid flows through the first chamber 200 of the first cooling plate 20 and the second chamber 210 of the second cooling plate 21 through the inlet end 22 and the outlet end 23 to achieve heat exchange with the contacted single batteries 1. The first cooling plate 20 and the second cooling plate 21 respectively contact the adjacent single batteries 1, which can quickly and uniformly take away the heat on the surface of the single batteries 1. The first cooling plate 20 and the second cooling plate 21 are respectively provided with the inlet end 22 and the outlet end 23, which can simplify the flow path of the cooling liquid and reduce the residence time of the cooling liquid in the liquid cooling assembly 2, thereby improving the cooling efficiency.

[0038] In some embodiments, the first cold plate 20 includes a plate body 201 and a first manifold 202 connected to the plate body 201, the plate body 201 is provided with a first cavity 200, and the first manifold 202 is connected to the plate body 201 and communicates with the first cavity 200 and a second cavity 210. The first cold plate 20 further includes a second manifold 203 connected to a side of the plate body 201 away from the first manifold 202 and connected to a side of the second cold plate 21 facing the first cold plate 20.

[0039] In some embodiments, the second manifold 203 communicates with the first cavity 200, the second manifold 203 is provided with a liquid outlet 23, the second cold plate 21 is provided with a liquid inlet 22, and the cooling liquid enters the second cavity 210 through the liquid inlet 22, flows to the first cavity 200 through the first manifold 202, and finally flows out through the liquid outlet 23 of the second manifold 203. In this way, the flow path of the cooling liquid can be simplified, the residence time of the cooling liquid in the liquid cooling assembly 2 can be reduced, and the cooling efficiency can be improved.

[0040] In other embodiments, the second manifold 203 communicates with the first cavity 200, the second manifold 203 is provided with a liquid inlet 22, and the second cold plate 21 is provided with a liquid outlet 23, as shown in Figure 4 and Figure 5 . The cooling liquid enters the second manifold 203 and the first cavity 200 communicating with the second manifold 203 through the liquid inlet 22, and flows to the second cavity 210 through the first manifold 202, and finally flows out through the liquid outlet 23. In this way, the flow path of the cooling liquid can be simplified, the residence time of the cooling liquid in the liquid cooling assembly 2 can be reduced, and the cooling efficiency can be improved.

[0041] In the embodiments shown in Figure 6 and Figure 7 , the battery pack has a third direction Z intersecting the first direction X and the second direction Y, respectively. The third direction Z is the length direction of the first manifold 202 and the second manifold 203. The plate body 201 includes a plurality of partition pieces 2010 arranged in the first cavity 200 and spaced apart along the third direction Z. The plurality of partition pieces 2010 divide the first cavity 200 into a plurality of flow channels 2000, and the plurality of flow channels 2000 respectively communicate with the first manifold 202 and the second manifold 203. When the cooling liquid enters the first cavity, it can be divided into a plurality of flow channels 2000, thereby increasing the contact area with the single battery 1 and making it easier for the single battery 1 to transfer heat to the cooling liquid. Increasing the contact area can improve the efficiency of heat transfer and prevent the single battery 1 from overheating locally, thereby enhancing the cooling effect of the cooling liquid on the single battery 1.

[0042] In the embodiments shown in Figure 7In the illustrated embodiment, the first cold plate 20 includes a plate body 201 provided with a first cavity 200, and the maximum thickness of the plate body 201 along the second direction Y is A mm, which satisfies 1≤A≤10. Specifically, the maximum thickness of the plate body 201 along the second direction Y can be any value or a range of any two values selected 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 space occupied by the first cold plate 20 can be reduced while ensuring the cooling effect of the cooling liquid on the single battery 1, so that more single batteries 1 can be arranged, and the grouping rate of the battery pack can be improved.

[0043] In Figure 5 In the illustrated embodiment, the second cold plate 21 includes a first shell 211 and a second shell 212, which enclose a second cavity 210. The first shell 211 is connected to the first manifold 202, and the first shell 211 is provided with a first opening 2110. The side of the first manifold 202 facing the first shell 211 is provided with a second opening 2020, the first opening 2110 and the second opening 2020 are in communication, and the first cavity 200 and the second cavity 210 are in communication through the first opening 2110 and the second opening 2020. In the embodiment of the present application, the first shell 211 and the second shell 212 are welded, and the first shell 211 and the first manifold 202 are welded. By providing the first opening 2110 on the first shell 211 and the second opening 2020 corresponding to the first opening 2110 on the first manifold 202, the communication between the first cavity 200 and the second cavity 210 can be achieved, the structure is simple, and the circulation of the cooling liquid in the first cavity 200 and the second cavity 210 can be promoted, thereby enhancing the heat exchange effect and improving the cooling effect.

[0044] In Figure 6 and Figure 7 In the illustrated embodiment, the second shell 212 is stamped along the third direction Z to form a plurality of flow channels 2100. When the cooling liquid enters the second cavity, it can be distributed to the plurality of flow channels 2100, thereby increasing the contact area with the single battery 1 and making it easier for the single battery 1 to transfer heat to the cooling liquid. Increasing the contact area can improve the efficiency of heat transfer and prevent local overheating of the single battery 1, thereby enhancing the cooling effect of the cooling liquid on the single battery 1.

[0045] In Figures 1 to 3In the embodiment shown, the battery pack comprises a box body 3, the box body 3 comprises side plates 31 and a bottom plate 30 connected with the side plates 31, and the side plates 31 and the bottom plate 30 enclose a containing cavity 32. The first cold plate 20 is arranged between two adjacent single batteries 1 and is in thermal conductive connection with the two adjacent single batteries 1. The first cold plate 20 arranged between the two adjacent single batteries 1 can increase the contact area with the single battery 1 and improve the efficiency of heat transfer. The second cold plate 21 is arranged between the single battery 1 and the bottom plate 30 and is in thermal conductive connection with the single battery 1 and the bottom plate 30, respectively. The second cold plate 21 is formed by stamping a second shell 212 and welding the second shell 212 to form the second cold plate 21. The second cold plate 21 has a certain load-bearing capacity. By using the second cold plate 21 to bear the single battery 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 in the battery pack.

[0046] In Figures 1 to 3 In the embodiment shown, the battery pack comprises a first end plate 4 and a second end plate 5 located in the containing cavity 32. The first end plate 4 and the second end plate 5 are respectively connected with 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 arranged in the first direction X and enclose the second cold plate 21 and the side plate 31 to form a containing space 6. A plurality of single batteries 1 are located in the containing space 6. The first end plate 4 and the second end plate 5 serve as limiting plates and are used to separate the containing cavity 32 to form the containing space 6 containing the single batteries 1. The liquid inlet end 22 and the liquid outlet end 23 are located outside the containing space 6, which is convenient for connecting with a liquid supply device (not shown).

[0047] In Figure 1 In the embodiment shown, the battery pack comprises a first end plate 4 and a second end plate 5. The first end plate 4 is connected with the side of the first current collector 202 away from the single battery 1. The first end plate 4 has a simple structure and can serve as a limiting plate for the first cold plate 20. The second end plate 5 is arranged between the second current collector 203 and the single battery 1 and is connected with the second current collector 203 and the single 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 with the plate body 201 through the second limiting groove 50, which can improve the stability of the connection.

[0048] In Figure 2 and Figure 3In the shown embodiment, the battery pack comprises a first end plate 4 and a second end plate 5, the first end plate 4 is arranged between the first current collector 202 and the single battery 1 and connected with the first current collector 202 and the single battery 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 arranged between the second current collector 203 and the single battery 1 and connected with the second current collector 203 and the single 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. In the embodiment of the present application, the first end plate 4 is connected with the plate body 201 through the first limiting groove 40, and the second end plate 5 is connected with the plate body 201 through the second limiting groove 50, which can further improve the stability of the connection.

[0049] In Figure 1 In the shown embodiment, a plurality of single batteries 1 are also arranged along the first direction X, and the second direction can be the width direction of the battery pack, the third direction can be the height direction of the battery pack, the first direction can be the length direction of the battery pack. The number of liquid cooling assemblies 2 is multiple, a plurality of liquid cooling assemblies 2 are arranged in the second direction Y and are in heat transfer connection with a plurality of single batteries 1 adjacent in the first direction X, the liquid inlet ends 22 of the plurality of liquid cooling assemblies 2 are connected with each other, and the liquid outlet ends 23 of the plurality of liquid cooling assemblies 2 are connected with each other. By arranging a plurality of liquid cooling assemblies 2, the contact area of the liquid cooling assembly 2 and the single battery 1 can be effectively improved, thereby effectively improving the cooling efficiency. By connecting the plurality of liquid inlet ends 22 with each other and connecting the plurality of liquid outlet ends 23 with each other, a continuous cooling liquid circulation path can be formed, so that the cooling liquid can flow between the plurality of liquid cooling assemblies 2, the structure of the liquid supply system can be simplified, and the maintenance and management cost of the cooling system can be reduced.

[0050] The embodiment of the present application provides a power utilization device comprising the above-mentioned battery pack. The battery pack is a power supply of the power utilization device. The power utilization device can be a mobile phone, a portable device, a notebook computer, an electric vehicle, an electric automobile, a ship, a spacecraft, an electric toy and an electric tool, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle and a spaceship, etc.; the electric toy includes a fixed or mobile electric toy, such as a game machine, an electric automobile toy, an electric ship toy and an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator and an electric planer, etc.

[0051] In the above-mentioned embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0052] The above has carried out the detailed introduction to the battery pack and the electric device provided by the embodiment of the application, and the principle and implementation mode of the application are described by applying specific examples; the above embodiment description is only used to help understand the technical solutions and core ideas of the application; those skilled in the art should understand that: the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application.

Claims

1. A battery pack, characterized by, The battery pack has a second direction (Y) and a third direction (Z) intersecting each other, and comprises: a plurality of single batteries (1) arranged along the second direction (Y); a liquid cooling assembly (2) comprising a first cooling plate (20) and a second cooling plate (21) connected to each other, the first cooling plate (20) being provided with one of an inlet end (22) and an outlet end (23), the second cooling plate (21) being provided with the other of the inlet end (22) and the outlet end (23); the first cooling plate (20) is provided with a first cavity (200), the second cooling plate (21) is provided with a second cavity (210), the first cavity (200) and the second cavity (210) are communicated; the first cooling plate (20) is arranged between two adjacent single batteries (1) and is in thermal conductive connection with the two adjacent single batteries (1), and the second cooling plate (21) is arranged on one side of the single batteries (1) along the third direction (Z) and is in thermal conductive connection with two adjacent single batteries (1).

2. The battery pack of claim 1, wherein, The first cooling plate (20) is provided with an inlet end (22), and the second cooling plate (21) is provided with an outlet end (23), the first cooling plate (20) comprises a plate body (201) and a first manifold (202) connected to each other, the first manifold (202) is communicated with the inlet end (22), the plate body (201) is provided with the first cavity (200), and the first manifold (202) is communicated with the first cavity (200) and the second cavity (210), and the outlet end (23) is communicated with the second cavity (210).

3. The battery pack of claim 2, wherein, The first cooling plate (20) comprises a second manifold (203), the second manifold (203) is provided with the inlet end (22), the second manifold (203) is connected to one side of the plate body (201) away from the first manifold (202) and connected to one side of the second cooling plate (21) facing the first cooling plate (20), and the second manifold (203) is communicated with the first cavity (200) and the inlet end (22).

4. The battery pack of claim 3, wherein, The plate body (201) comprises a plurality of partitions (2010), a plurality of the partitions (2010) are arranged in the first cavity (200) and are arranged at intervals along the third direction (Z), a plurality of the partitions (2010) divide the first cavity (200) into a plurality of flow channels (2000), and a plurality of the flow channels (2000) are communicated with the first manifold (202) and the second manifold (203) respectively.

5. The battery pack of claim 2, wherein, The second cold plate (21) comprises a first shell (211) and a second shell (212), the first shell (211) and the second shell (212) enclose the second cavity (210), the first shell (211) is connected with the first manifold (202), the first shell (211) is provided with a first opening (2110), one side of the first manifold (202) towards the first shell (211) is provided with a second opening (2020), the first opening (2110) and the second opening (2020) are communicated, and the first cavity (200) and the second cavity (210) are communicated through the first opening (2110) and the second opening (2020).

6. The battery pack of claim 1, wherein, The first cold plate (20) comprises a plate body (201), the plate body (201) is provided with the first cavity (200), and the maximum thickness of the plate body (201) along the second direction (Y) is A mm, and the following condition is met: 1≤A≤10.

7. The battery pack of claim 1, wherein, The battery pack comprises: A box body (3) comprising side plates (31) and bottom plates (30) connected with the side plates (31), the side plates (31) and the bottom plates (30) enclosing a containing cavity (32); the first cold plate (20) is arranged between two adjacent single batteries (1) and is in thermal conductive connection with the two adjacent single batteries (1), and the second cold plate (21) is arranged between the single battery (1) and the bottom plate (30) and is in thermal conductive connection with the single battery (1) and the bottom plate (30) respectively.

8. The battery pack of claim 7, wherein, The battery pack has a first direction (X) intersecting with the second direction (Y) and the third direction (Z), the battery pack comprises first end plates (4) and second end plates (5) located in the containing cavity (32), the first end plates (4) and the second end plates (5) are connected with one side of the second cold plate (21) towards the first cold plate (20) respectively, the first end plates (4) and the second end plates (5) are arranged at intervals along the first direction (X) and enclose the second cold plate (21) and the side plates (31) to form a containing space (6), and a plurality of single batteries (1) are located in the containing space (6).

9. The battery pack of claim 3, wherein, The battery pack comprises first end plates (4) and second end plates (5), the first end plates (4) are arranged between the first manifold (202) and the single battery (1) and are connected with the first manifold (202) and the single battery (1) respectively, the first end plates (4) are provided with first limiting grooves (40), and the plate body (201) is embedded in the first limiting grooves (40); the second end plates (5) are arranged between the second manifold (203) and the single battery (1) and are connected with the second manifold (203) and the single battery (1) respectively, the second end plates (5) are provided with second limiting grooves (50), and the plate body (201) is embedded in the second limiting grooves (50); or The battery pack comprises a first end plate (4) and a second end plate (5), the first end plate (4) is connected with the side of the first current collector (202) away from the single battery (1); the second end plate (5) is arranged between the second current collector (203) and the single battery (1) and is connected with the second current collector (203) and the single 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).

10. The battery pack of claim 1, wherein, The battery pack has a first direction (X) intersecting with the second direction (Y) and the third direction (Z), a plurality of single batteries (1) are arranged along the first direction (X), the number of the liquid cooling assemblies (2) is a plurality, a plurality of the liquid cooling assemblies (2) are arranged in the second direction (Y) and are in heat conduction connection with a plurality of the single batteries (1) adjacent to the first direction (X), the liquid inlet ends (22) of a plurality of the liquid cooling assemblies (2) are connected with each other, and the liquid outlet ends (23) of a plurality of the liquid cooling assemblies (2) are connected with each other.

11. An electrical device, characterized by The battery pack comprises the battery pack according to any one of claims 1-10. The battery pack comprises the battery pack according to any one of claims 1-10.

Images