A battery device and an electric device

Abstract

The application discloses a battery device and a power utilization device. The battery device comprises an inter-group cooling member and a plurality of battery modules. The inter-group cooling member is arranged along a first direction, and the plurality of battery modules are arranged on the inter-group cooling member along the first direction. Each battery module comprises two end plates and at least one battery group. Each battery group comprises a plurality of battery cells arranged in sequence along a second direction perpendicular to the first direction. Each battery cell comprises two first sides arranged opposite to each other along the second direction and two second sides arranged opposite to each other along the first direction. The area of the first side is larger than that of the second side. The two end plates are located on both sides of the battery group along the second direction and are in contact with the battery cells on both sides, respectively. Thus, the inter-group cooling member can cool the plurality of battery modules while reducing the structural complexity of the inter-group cooling member.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are key to sustainable development, which in turn promotes the adjustment of the energy structure and drives the development and application of battery technology. The key to the development of battery technology lies in electrochemical energy storage technology. Due to its advantages such as high energy density, good cycle capability, high operating voltage, environmental friendliness, and low self-discharge, it has been widely used in portable electronics, electric vehicles, and energy storage systems.

[0003] A battery device consists of multiple battery cells. Each battery cell generates a lot of heat during charging and discharging. In order not to affect the normal operation of the battery device, the battery device needs to have good heat dissipation performance. However, the heat dissipation performance of existing battery devices is poor and it is difficult to meet the high heat dissipation requirements of the battery device. Summary of the Invention

[0004] The main objective of this application is to provide a battery device and an electrical device that address the aforementioned technical problems existing in the prior art.

[0005] To address the aforementioned problems, this application provides a battery device comprising: an inter-group cooling component and a plurality of battery modules. The inter-group cooling component extends along a first direction, and the plurality of battery modules are arranged on the inter-group cooling component along the first direction. Each battery module includes two end plates and at least one set of battery groups. Each battery group includes a plurality of battery cells arranged sequentially in a second direction perpendicular to the first direction. Each battery cell includes two first sides arranged opposite to each other in the second direction and two second sides arranged opposite to each other in the first direction. The area of ​​the first sides is larger than the area of ​​the second sides. The two end plates are located on both sides of the battery group in the second direction and respectively contact the battery cells on both sides. Therefore, multiple battery modules are arranged along the first direction on the inter-group cooling component. This reduces the structural complexity of the inter-group cooling component while allowing multiple battery modules to be cooled together. Each battery module includes two end plates and at least one set of battery groups. Each battery group includes multiple battery cells arranged sequentially in the second direction. The first side of the larger area of ​​the battery cell is perpendicular to the second direction. The two end plates are located on both sides of the battery group in the second direction and contact the battery cells on both sides respectively. The two end plates can cool the battery cells and limit and fix the battery group in the second direction. This improves the space occupied by the battery cells in the first direction due to the arrangement of the battery cells in the battery group, thereby increasing the energy density of the battery device by making reasonable use of the space of the battery device.

[0006] In some embodiments, each battery module includes two edge cooling plates, which are arranged opposite to each other and spaced apart in the first direction. The two ends of one edge cooling plate are connected to two end plates to form a hollow region, where the battery cells are located. Thus, the two ends of one edge cooling plate are connected to two end plates to form a hollow region, reducing the molding difficulty of the battery module and improving the cooling efficiency of the individual battery cells.

[0007] In some embodiments, the battery module includes a cooling top plate, which connects the end plate and the side cold plate and covers the hollow area. The cooling top plate is in contact with the battery cells. Thus, by connecting the end plate and the side cold plate and covering the hollow area, the cooling top plate, in conjunction with the end plate and the side cold plate, can fix the battery cells, improving the fixation effect. Simultaneously, the contact between the cooling top plate and the battery cells also improves the cooling efficiency of the battery cells.

[0008] In some embodiments, the battery module includes a reinforcing member located on the side of the cooling top plate opposite to the hollow region. The reinforcing member extends along the second direction and is connected to the two end plates. Thus, the reinforcing member, located on the side of the cooling top plate opposite to the hollow region and extending along the second direction to connect to the two end plates, enhances the overall structural strength of the battery module, thereby mitigating the risk of damage to the battery module due to cell expansion.

[0009] In some embodiments, the inter-module cooling component includes cooling conduits, with each battery cell of each battery module in direct contact with the cooling conduits. This direct contact between the battery cells and the cooling conduits improves heat transfer efficiency between the battery cells and the cooling conduits, thereby enhancing the cooling efficiency of the battery module.

[0010] In some embodiments, the battery device includes a battery housing with a receiving space, in which a plurality of battery modules and an inter-module cooling component are disposed, and the cooling pipes are fixed to the wall of the battery housing. Thus, fixing the cooling pipes to the wall of the battery housing reduces the molding difficulty of the inter-module cooling component.

[0011] In some embodiments, the battery device includes an inter-module manifold connecting two adjacent battery modules. This inter-module manifold allows cooling fluids between the battery modules to communicate and collectively cool the individual battery cells, further improving the cooling efficiency of the battery device.

[0012] In some embodiments, each battery module includes a first busbar, with the first busbars of two adjacent battery modules disposed opposite each other. The inter-module busbar includes at least one first pipe, and each first pipe connects to two opposite first busbars. Thus, by connecting the two opposite first busbars through the first pipe, the cooling fluid between battery modules can be interconnected through a simple structure, reducing the structural complexity of the battery device.

[0013] In some embodiments, each battery module includes a second busbar spaced apart from the first busbar, and the second busbars of two adjacent battery modules are arranged opposite each other. The inter-module busbar includes at least one second pipe, and each second pipe connects to two opposite second busbars. Thus, the inter-module busbar, including at least one second pipe and each second pipe connecting to two opposite second busbars, can improve the efficiency of cooling fluid flow between different battery modules through the cooperation of the two second busbars and the second pipe, thereby improving the cooling efficiency of the battery modules.

[0014] In some embodiments, the battery module includes a central cooling plate, which is at least partially located between and in contact with at least two of the battery cells. Therefore, the central cooling plate, being located between and in contact with at least two battery cells, can further improve the cooling efficiency of the battery device, thereby enhancing its heat dissipation performance.

[0015] In some embodiments, within the same battery module, the central cold plate contacts the first side surface of two adjacent battery cells and / or contacts the second side surface of two adjacent battery cells. Thus, by contacting the first side surface of two adjacent battery cells and / or the second side surface of two adjacent battery cells, the central cold plate can improve the cooling efficiency of the battery device while also simplifying its structural design.

[0016] In some embodiments, within the same battery module, the central cold plate includes at least one first partition cold plate, with the first partition cold plate sandwiched between the first side surfaces of two adjacent battery cells in the same battery group. Thus, sandwiching the first partition cold plate between the larger area of ​​the first side surfaces of two adjacent battery cells simplifies the structural design of the first partition cold plate while increasing the contact area between the first partition cold plate and the battery cells, thereby improving the cooling efficiency of the battery module.

[0017] In some embodiments, in any two adjacent battery cells, a first partition cold plate is sandwiched between each pair of opposite first side surfaces. Thus, sandwiching the first partition cold plate between the larger area of ​​the first side surfaces of two adjacent battery cells simplifies the structural design of the first partition cold plate while increasing the contact area between the first partition cold plate and the battery cell, thereby improving the cooling efficiency of the battery module.

[0018] In some embodiments, the number of battery groups in the same battery module is at least two groups, and the at least two groups of battery groups are arranged along the first direction. The central cold plate includes at least one second partition cold plate, which is sandwiched between the first sides of two adjacent battery cells in one group of battery groups and between the first sides of two adjacent battery cells in another group of adjacent battery groups. Thus, by sandwiching the second partition cold plate between the first sides of two adjacent battery cells in one group of battery groups and between the first sides of two adjacent battery cells in another group of adjacent battery groups, the contact area between the second partition cold plate and the battery cells can be increased through the simple structural design of the second partition plate, thereby improving the cooling efficiency of the battery module.

[0019] In some embodiments, the number of battery groups in the same battery module is at least two groups, and the at least two groups of battery groups are arranged along the first direction. The central cold plate includes at least one third dividing cold plate, which is sandwiched between the two groups of battery groups. Thus, the central cold plate includes at least one third dividing cold plate, which, sandwiched between the two groups of battery groups, can divide the battery groups by means of the third dividing cold plate, and at the same time cool the battery groups on both sides by means of the third dividing cold plate, thereby improving the cooling efficiency of the battery module.

[0020] In some embodiments, the third partition plate extends along the second direction and contacts the second side surface of each battery cell in the battery pack on both sides. Thus, by having the third partition plate contact the second side surface of each battery cell in the battery pack on both sides, the contact area between the first cooling assembly and the battery cell can be further increased, thereby improving the cooling efficiency of the battery module.

[0021] In some embodiments, the battery device is provided with an inlet and an outlet, which are respectively connected to the flow channels of the battery module and / or the flow channels of the inter-module cooling component. Thus, the inlet and outlet are connected to the flow channels of the battery module and / or the inter-module cooling component, facilitating the replacement of the cooling fluid in the flow channels of the battery module and / or the inter-module cooling component through the inlet and outlet, thereby improving the cooling efficiency of the battery module.

[0022] In some embodiments, the battery device includes an end manifold connecting the liquid inlet, the liquid outlet, the flow channel of the inter-module cooling component, and the flow channel of at least one battery module. Thus, by connecting the liquid inlet, the liquid outlet, the flow channel of the inter-module cooling component, and the flow channel of at least one battery module, the end manifold can improve the cooling efficiency of the battery modules while reducing the structural complexity of the battery device.

[0023] In some embodiments, among the plurality of battery modules, the flow channels of the battery modules closer to the end manifold are connected to the end manifold, and the flow channels of the battery modules connected to the end manifold are connected to the flow channels of the remaining battery modules through inter-group manifolds. Thus, the flow channels of the battery modules closer to the central manifold are connected to the end manifolds, and the flow channels of the battery modules connected to the end manifolds are connected to the flow channels of the remaining battery modules through inter-group manifolds. This allows for improved cooling efficiency of the battery modules while reducing the structural complexity of the battery device through the end manifolds.

[0024] To address the aforementioned problems, this application provides an electrical device, which includes the battery device described above. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the 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.

[0026] Figure 1 This is a structural schematic diagram of a vehicle according to one or more embodiments;

[0027] Figure 2 This is a schematic diagram of a battery device according to one or more embodiments with some parts removed;

[0028] Figure 3 This is a schematic diagram of the structure of a battery device according to one or more embodiments;

[0029] Figure 4 This is a schematic diagram of the structure of a battery module according to one or more embodiments;

[0030] Figure 5 yes Figure 4 The diagram shows the structure of the battery module after the end plate and side cold plate are assembled.

[0031] Figure 6 This is a schematic diagram of the structure of a battery module and an inter-module busbar according to one or more embodiments;

[0032] Figure 7 yes Figure 2 An enlarged schematic diagram of the structure within the dashed box in the battery device shown;

[0033] Figure 8 This is a schematic diagram of the structure of a first embodiment of a battery module according to one or more embodiments;

[0034] Figure 9 This is a schematic diagram of the structure of a second embodiment of a battery module according to one or more embodiments;

[0035] Figure 10 This is a structural schematic diagram of a third embodiment of a battery module according to one or more embodiments;

[0036] Figure 11 This is a structural schematic diagram of a fourth embodiment of a battery module according to one or more embodiments.

[0037] Reference numerals: Vehicle 1; Battery unit 2; Controller 3; Motor 4; Battery module 10; End plate 111; Side cold plate 112; Hollow area 113; Cooling top plate 114; Reinforcing member 115; First junction port 116; Second junction port 117; Battery cell 12; First side 121; Second side 122; Battery group 123; Central cold plate 13; First separating cold plate 131; Second separating cold plate 132; Third separating cold plate 133; Inter-group cooling component 20; Cooling pipe 21; Inter-group manifold 30; Battery housing 40; Liquid inlet 41; Liquid outlet 42; Reception space 410; End manifold 50; First direction X; Second direction Y. Detailed Implementation

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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).

[0044] 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.

[0045] 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.

[0046] Currently, judging from market trends, battery applications are becoming increasingly widespread. Batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of battery applications, market demand is also constantly increasing.

[0047] A battery device consists of multiple battery cells. Each battery cell generates a lot of heat during charging and discharging. In order not to affect the normal operation of the battery device, the battery device needs to have good heat dissipation performance. However, the heat dissipation performance of existing battery devices is poor and it is difficult to meet the high heat dissipation requirements of the battery device.

[0048] To address the technical problems existing in related technologies, this application provides a battery device and an electrical device. The battery device includes multiple battery modules and an inter-module cooling component. The inter-module cooling component extends along a first direction, and the multiple battery modules are arranged along the first direction. The battery cells inside the battery modules are arranged along a second direction, and the end plates of the battery modules are located on both sides of the battery group and in contact with the battery cells on both sides. This makes reasonable use of the internal space of the battery device, and at the same time, it can dissipate heat inside the battery modules and simultaneously dissipate heat from multiple battery modules through the inter-module cooling component to improve the heat dissipation performance of the battery device.

[0049] Specifically, this application provides an electrical device, which may include, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys may include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc. The electrical device may include a battery, which can provide electrical power to achieve the corresponding function.

[0050] This application also provides an electric vehicle that may include a battery device.

[0051] Please refer to Figure 1 , Figure 1 This is a structural schematic diagram of a vehicle according to one or more embodiments.

[0052] Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 2 is installed inside vehicle 1, and the battery device 2 can be located at the bottom, front, or rear of vehicle 1. The battery device 2 can be used to power vehicle 1; for example, it can serve as the operating power source for vehicle 1. Vehicle 1 may also include a controller 3 and a motor 4. The controller 3 controls the battery device 2 to supply power to the motor 4, for example, to meet the power needs of vehicle 1 during starting, navigation, and driving.

[0053] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0054] To improve the performance of electrical devices, this application also provides a battery device, see [link to relevant documentation]. Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of a battery device according to one or more embodiments with some parts removed; Figure 3This is a schematic diagram of a battery device according to one or more embodiments.

[0055] The battery device 2 includes an inter-group cooling component 20 and a plurality of battery modules 10. The inter-group cooling component 20 extends along a first direction X. The plurality of battery modules 10 are arranged on the inter-group cooling component 20 along the first direction X. Each battery module 10 includes two end plates 111 and at least one set of battery groups 123. Each battery group 123 includes a plurality of battery cells 12 arranged sequentially in a second direction Y perpendicular to the first direction X. Each battery cell 12 includes two first side surfaces 121 arranged opposite to each other in the second direction Y and two second side surfaces 122 arranged opposite to each other in the first direction X. The area of ​​the first side surface 121 is larger than the area of ​​the second side surface 122. The two end plates 111 are located on both sides of the battery group 123 in the second direction Y and contact the battery cells 12 on both sides respectively.

[0056] The shape of the battery device 2 can be, but is not limited to, square, cylindrical, or other arbitrary shapes. The number of battery modules 10 can be set according to actual conditions. Multiple battery modules 10 can be arranged according to a certain pattern. In this embodiment, multiple battery modules 10 can all be arranged in a row along the first direction X. The number of battery cells 12 in each battery module 10 can be set according to actual conditions. There can be multiple battery cells 12, which can be connected in series, parallel, or mixed. Mixed connection means that multiple battery cells 12 are connected in both series and parallel. Multiple battery cells 12 can be directly connected in series, parallel, or mixed together to form a whole. The battery module 10 can also include other structures. For example, the battery module 10 can also include a busbar component for realizing the electrical connection between multiple battery cells 12. The battery cells 12 can be manufactured by stacking or winding, that is, the battery cells 12 are divided into stacked batteries and wound batteries. Stacked batteries offer uniform current collection, low internal resistance, and high specific power. However, achieving high precision requires extremely precise molds, resulting in high equipment investment, complex processes, and low production efficiency. Wound batteries, on the other hand, are simpler to manufacture, with less stringent precision requirements for equipment during sheet fabrication and assembly. They offer high production efficiency and lower costs. In terms of performance, wound batteries boast excellent high and low temperature performance, very rapid charging, ultra-long lifespan, stable high output voltage, and a robust, shock-resistant structure.

[0057] In this embodiment, the battery cell 12 can be a prismatic battery cell 12. The outer shell of the prismatic battery cell 12 can have four sides, namely two first sides 121 arranged opposite to each other and two second sides 122 arranged opposite to each other, and the area of ​​the first side 121 is larger than the area of ​​the second side 122. In the same battery module 10, multiple battery cells 12 can be divided into multiple battery groups 123. The number of battery groups 123 can be set according to the actual situation. The first sides 121 of multiple battery cells 12 in the battery group 123 are perpendicular to the second direction Y, that is, the multiple battery cells 12 in the battery group 123 are arranged sequentially along the second direction Y. The inter-group cooling component 20 extends along the first direction X. Multiple battery modules 10 are arranged along the first direction X, and the battery cells 12 inside the battery module 10 are arranged along the second direction Y. This allows the inter-group cooling component 20 to contact the battery module 10 at the same time, while increasing the number of battery cells 12 stored in the battery module 10. The inter-module cooling component 20 may be provided with a flow channel for the flow of cooling fluid. The inter-module cooling component 20 can contact multiple battery modules 10 at the same time, so that the cooling fluid in the inter-module cooling component 20 can exchange heat with multiple battery modules 10 at the same time, thereby reducing the heat of the battery modules 10.

[0058] Each end plate 111 of the battery module 10 can serve as a frame structure for the battery cells 12 of that battery module 10. Two end plates 111 can be used to fix multiple battery cells 12, so that the battery module 10 forms an integral structure. The end plate 111 may have a flow channel for the flow of cooling fluid, which may include, but is not limited to, cooling water, cooling oil, or cooling gas. The flow channels of the end plates 111 of different battery modules 10 can be interconnected, thereby allowing fluid exchange between different battery modules 10. When the end plate 111 contacts the battery cell 12, heat exchange can occur between the end plate 111 and the battery cell 12, reducing the heat of the battery cell 12.

[0059] Through the above implementation, multiple battery modules 10 are arranged on the inter-group cooling component 20 along the first direction X. This reduces the structural complexity of the inter-group cooling component 20 while allowing the multiple battery modules 10 to be cooled together by the inter-group cooling component 20. The battery module 10 includes two end plates 111 and at least one set of battery groups 123. Each battery group 123 includes multiple battery cells 12 arranged sequentially in the second direction Y. The first side 121 of the larger area of ​​the battery cell 12 is perpendicular to the second direction Y. The two end plates 111 are located on both sides of the battery group 123 in the second direction Y and contact the battery cells 12 on both sides respectively. The two end plates 111 can cool the battery cells 12 and limit and fix the battery group 123 in the second direction Y. This improves the space occupied by the battery cells 12 in the first direction X due to the arrangement of the battery cells 12 in the battery group 123, thereby increasing the energy density of the battery device 2 by making reasonable use of the space of the battery device 2.

[0060] See Figure 4 and Figure 5 , Figure 4 This is a schematic diagram of the structure of a battery module 10 according to one or more embodiments. Figure 5 yes Figure 4 The diagram shows the structure of the battery module 10 after the end plate 111 and the side cold plate 112 are assembled.

[0061] Each battery module 10 includes two edge cooling plates 112, which are arranged opposite to each other and spaced apart in a first direction X. Two end plates 111 are connected to both ends of one edge cooling plate 112 to form a hollow region 113, within which a battery group 123 is located. The edge cooling plates 112 can extend along a second direction Y, with both ends connected to the two end plates 111 to form a quadrilateral frame structure. Battery cells 12 are located within the hollow region 113, and multiple battery cells 12 of the battery group 123 are arranged along the second direction Y, ensuring that all battery cells 12 are in contact with the edge cooling plates 112, thus improving the cooling efficiency of the battery cells 12. The end plates 111 can be welded to the edge cooling plates 112. The edge cooling plates 112 can include, but are not limited to, a harmonica tube water-cooled structure. A flexible adapter pipe can be provided inside the edge cooling plate 112, and the flexible adapter pipe can have a flow channel for cooling fluid. The end plate 111 may have a flow channel for cooling fluid to flow through it. The flow channel inside the end plate 111 may penetrate both sides of the end plate 111 in the first direction X. After connecting two side cold plates 112 at both ends of the end plate 111, the flow channel of the end plate 111 may communicate with the flow channel of the side cold plates 112 at both ends, so as to facilitate the flow of cooling fluid between the end plate 111 and the side cold plates 112. The structural strength of the end plate 111 may be greater than that of the side cold plates 112. The two end plates 111 and the two side cold plates 112 are connected to form the frame structure of the battery module 10. Each end plate 111 and each side cold plate 112 may be in direct contact with the battery cell 12. The risk of abnormal expansion of the battery cell 12 can be limited by the end plate 111 with greater structural strength. Thus, the two ends of a side cold plate 112 are connected to two end plates 111 to form a hollow area 113, which reduces the molding difficulty of the battery module 10, and at the same time can improve the cooling efficiency of the battery cell 12 through the side cold plate 112.

[0062] In some embodiments, the battery module 10 includes a cooling top plate 114, which connects to the end plate 111 and the side cold plate 112 and covers the hollow region 113. The cooling top plate 114 is in contact with the battery cell 12. The cooling top plate 114 may be flat, covering the hollow region 113, and welded to the end plate 111 and the side cold plate 112 to form a groove structure together. Alternatively, there may be two cooling top plates 114, located on opposite sides of the hollow region 113, with one cooling top plate 114 covering an opening in the hollow region 113, so that the two cooling top plates 114, the end plate 111, and the side cold plate 112 together form a hollow box structure. The cooling top plate 114 may have flow channels inside. The flow channels of the cooling top plate 114 may be interconnected with the flow channels of the end plate 111 and the side cold plate 112 to form the flow channels inside the battery module 10. For example, the two end plates 111 are arranged relatively spaced apart, the two side cold plates 112 are arranged relatively spaced apart, and the two ends of one side cold plate 112 are connected to the two end plates 111. The cooling top plate 114 may cover the hollow area 113 and be welded and fixed to the two end plates 111. Both the end plate 111 and the cooling top plate 114 are provided with flow channels. The flow channels of the end plate 111 may be interconnected with the flow channels of the cooling top plate 114 and the flow channels of the side cold plate 112, thereby making the flow channels of the end plate 111, the flow channels of the side cold plate 112 and the flow channels between the cooling top plate 114 interconnected. Other components can also be integrated on the cooling top plate 114, such as a current-combining component. The battery cells 12 in the hollow region 113 can be electrically connected through the current-combining component. Thus, the cooling top plate 114 connects the end plate 111 and the side cold plate 112 and covers the hollow region 113. The cooling top plate 114, in conjunction with the end plate 111 and the side cold plate 112, can fix the battery cells 12, improving the fixation effect of the battery cells 12. At the same time, the contact between the cooling top plate 114 and the battery cells 12 can also improve the cooling efficiency of the battery cells 12.

[0063] In some embodiments, the battery module 10 includes a reinforcing member 115 located on the side of the cooling top plate 114 opposite to the hollow region 113. The reinforcing member 115 extends along a second direction Y and is connected to two end plates 111. The reinforcing member 115 can be a steel strip. It can be welded or bolted to the end plates 111. The number of reinforcing members 115 can be set according to actual conditions; for example, there can be one or more reinforcing members 115, which can be spaced apart and extend in the same direction. The reinforcing member 115, located on the side of the cooling top plate 114 opposite to the hollow region 113, can restrict the cooling top plate 114, reducing the risk of deformation caused by the expansion of the battery cells 12. It also enhances the structural strength of the battery module 10, thereby reducing the risk of damage to the battery module 10 due to the expansion of the battery cells 12.

[0064] In some embodiments, the inter-module cooling component 20 includes a cooling conduit 21, with each battery cell 12 of the battery module 10 in direct contact with the cooling conduit 21. The cooling conduit 21 may have internal flow channels, which can reduce the molding difficulty of the inter-module cooling component 20. The cooling conduit 21 can be attached to the outside of the battery module 10 or fixed to other components of the battery device 2. Direct contact between the battery cell 12 of each battery module 10 and the cooling conduit 21 improves the heat transfer efficiency between the battery cell 12 and the cooling conduit 21, thereby improving the cooling efficiency of the battery module 10.

[0065] Furthermore, the battery device 2 includes a battery housing 40, which has a receiving space 410. Multiple battery modules 10 and inter-module cooling components 20 are disposed in the receiving space 410, and cooling pipes 21 are fixed to the wall of the battery housing 40. The battery housing 40 provides the receiving space 410 for the battery device 2. The battery housing 40 can adopt various structures. In some embodiments, the battery housing 40 may include a first part and a second part, which overlap each other, jointly defining the receiving space 410. The second part can be a hollow structure with one open end, and the first part can be a plate-like structure, covering the open side of the second part so that the first part and the second part jointly define the receiving space 410. The cooling pipes 21 can be fixed to the bottom wall and / or top wall of the battery housing 40, reducing the molding difficulty of the inter-module cooling components 20.

[0066] Combination Figure 6 , Figure 6 This is a schematic diagram of the structure of the battery module 10 and the inter-module busbar 30 according to one or more embodiments.

[0067] The battery device 2 includes an inter-module manifold 30 that connects two adjacent battery modules 10. Exemplarily, multiple battery modules 10 can be arranged sequentially in a row, and the inter-module manifold 30 can be divided into multiple sections. Partial sections of the inter-module manifold 30 are located between two adjacent battery modules 10 and connect to the flow channels of the adjacent two battery modules 10 respectively, allowing cooling fluid between the flow channels of the adjacent two battery modules 10 to flow to each other. For example, in the first direction X, the first battery module 10 is connected to the second battery module 10 through a partial section of the inter-module manifold 30, the second battery module 10 is connected to the third battery module 10 through a partial section of the inter-module manifold 30, and so on, with the (n-1)th battery module 10 connected to the nth battery module 10 through a partial section of the inter-module manifold 30. Therefore, two adjacent battery modules 10 are connected through the inter-module manifold 30, which allows the cooling fluid between the battery modules 10 to be interconnected, so as to jointly cool the battery cells 12 between the battery modules 10, thereby further improving the cooling efficiency of the battery device 2.

[0068] Furthermore, each battery module 10 includes a first manifold 116, with the first manifolds 116 of two adjacent battery modules 10 arranged opposite each other. The inter-module manifold 30 includes at least one first pipe, with each first pipe connecting the two opposite first manifolds 116. The first manifold 116 may be located on the side of the battery module 10, and may be an inlet or outlet of the flow channel of the battery module 10. The first pipe may include, but is not limited to, an injection-molded pipe, and may have a flow channel inside. The two ends of the first pipe are respectively connected to the first manifolds 116 of two adjacent battery modules 10, thereby enabling the flow channels of the two battery modules 10 to be connected through the flow channels of the first pipe. Thus, by connecting the two opposite first manifolds 116 through the first pipe, the cooling fluid between the battery modules 10 can be interconnected with a simple structure, reducing the structural complexity of the battery device 2.

[0069] Furthermore, each battery module 10 includes a second busbar 117 spaced apart from the first busbar 116. The second busbars 117 of two adjacent battery modules 10 are arranged opposite each other. The inter-module manifold 30 includes at least one second pipe, and each second pipe connects two opposite second busbars 117. One of the first busbar 116 and the second busbar 117 is an inlet, and the other is an outlet. The second pipe may include, but is not limited to, an injection-molded pipe. The second pipe may have a flow channel inside, and its two ends are respectively connected to the second busbars 117 of two adjacent battery modules 10, thereby enabling the flow channels 110 of the two battery modules 10 to be connected through the flow channel of the second pipe. Each battery module 10 may include multiple sets of first busbars 116 and second busbars 117. For example, each battery module 10 may include two sets of first busbars 116 and second busbars 117, and the two sets of first busbars 116 and second busbars 117 may be located on opposite sides of the battery module 10. Therefore, the inter-group manifold 30 includes at least one second pipe, each second pipe connecting two opposite second manifold ports 117. The efficiency of the cooling fluid flow between different battery modules 10 can be improved by the cooperation of the two second manifold ports 117 and the second pipe, thereby improving the cooling efficiency of the battery module 10.

[0070] Combination Figure 7 , Figure 7 yes Figure 2 An enlarged schematic diagram of the structure within the dashed box in the battery device 2 shown.

[0071] The battery device 2 is provided with an inlet 41 and an outlet 42, which are respectively connected to the flow channels of the battery module 10 and / or the flow channels of the inter-module cooling component 20. The inlet 41 and outlet 42 may be located on the battery housing 40 of the battery device 2, and both can be connected to the flow channels of the battery module 10 and the inter-module cooling component 20 via pipes. The inlet 41 allows cooling fluid to flow into the flow channels of the battery module 10 and the inter-module cooling component 20, while the outlet 42 can be used to collect the cooling fluid, allowing the cooling fluid in the flow channels of the battery module 10 and the inter-module cooling component 20 to flow out through the outlet 42. In some embodiments, the inlet 41 and outlet 42 may only be connected to the flow channels of the battery module 10, and the flow channels of the inter-module cooling component 20 may be connected to the flow channels of the battery module 10. Alternatively, the inlet 41 and outlet 42 may only connect to the flow channels of the inter-group cooling component 20, with the flow channels of the battery module 10 connected to the flow channels of the inter-group cooling component 20. Alternatively, the inlet 41 and outlet 42 may simultaneously connect to the flow channels of both the inter-group cooling component 20 and the battery module 10. Thus, the inlet 41 and outlet 42 are respectively connected to the flow channels of the battery module 10 and / or the inter-group cooling component 20, facilitating the replacement of the cooling fluid in the flow channels of the battery module 10 and / or the inter-group cooling component 20 through the inlet 41 and outlet 42, thereby improving the cooling efficiency of the battery module 10.

[0072] Furthermore, the battery device 2 includes an end manifold 50, which connects the inlet 41, the outlet 42, the flow channel of the inter-group cooling component 20, and the flow channel of at least one battery module 10. The end manifold 50 may be a hollow, elongated strip, allowing cooling fluid to flow. It may extend along a second direction Y and have multiple openings, some for connecting to the flow channel of the battery module 10, some for connecting to the flow channel of the inter-group cooling component 20, and some for connecting to the inlet 41 and the outlet 42. Thus, by connecting the inlet 41, the outlet 42, the flow channel of the inter-group cooling component 20, and the flow channel of at least one battery module 10, the end manifold 50 can improve the cooling efficiency of the battery module 10 while reducing the structural complexity of the battery device 2.

[0073] In some embodiments, among the plurality of battery modules 10, the flow channels of the battery module 10 closer to the end manifold 50 are connected to the end manifold 50, and the flow channels of the battery module 10 connected to the end manifold 50 are connected to the flow channels of the remaining battery modules 10 through the inter-group manifold 30. The plurality of battery modules 10 are arranged in a row, and the end manifold 50 can be extended along the second direction Y. The end manifold 50 can be connected to the flow channels of the battery modules 10 at the end of the plurality of battery modules 10 in the row, and the remaining battery modules 10 that do not flow through the end manifold 50 can be connected sequentially through the flow channels of the inter-group manifold 30, so that the flow channels of all battery modules 10 can be directly or indirectly connected to the end manifold 50. Therefore, the flow channel of the battery module 10 closer to the middle manifold is connected to the end manifold 50, and the flow channel of the battery module 10 connected to the end manifold 50 is connected to the flow channel of the other battery modules 10 through the inter-group manifold 30. This can improve the cooling efficiency of the battery module 10 while reducing the structural complexity of the battery device 2 through the end manifold 50.

[0074] See Figure 8 , Figure 8 This is a schematic diagram of the structure of a first embodiment of a battery module 10 according to one or more embodiments.

[0075] The battery module 10 includes a central cold plate 13, which is at least partially located between and in contact with at least two battery cells 12. The battery cells 12 may include, but are not limited to, prismatic battery cells 12 or blade battery cells 12. Each battery cell 12 may include a housing, electrode assemblies, and other functional components. The housing includes end caps and a casing. An end cap is a component that closes onto the opening of the casing to isolate the internal environment of the battery cell 12 from the external environment. The shape of the end cap may be adapted to the shape of the casing to fit the casing. Optionally, the end cap may be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap is less prone to deformation under pressure and impact, enabling the battery cell 12 to have higher structural strength and improved safety performance. Functional components such as electrode terminals may be provided on the end cap, which can be used to electrically connect to the electrode assemblies for outputting or inputting electrical energy into the battery cell 12. The housing is a component used to mate with the end cap to form the internal environment of the battery cell 12, wherein the formed internal environment can accommodate electrode components, electrolyte, and other components. The housing and end cap can be independent components, and an opening can be provided on the housing. The end cap closes the opening to form the internal environment of the battery cell 12. The housing can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing can be determined according to the specific shape and size of the electrode components. The housing can be made of various materials, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0076] The number of battery cells 12 can be set according to actual conditions. The central cold plate 13 can be located within the hollow region 113. The shape of the central cold plate 13 can be determined according to the shape of the battery cells 12 and the arrangement of multiple battery cells 12. For example, the central cold plate 13 can surround the outside of each battery cell 12, that is, the central cold plate 13 can be made into an integral fixed structure, and the central cold plate 13 has multiple holes, each hole can hold one or more battery cells 12. Alternatively, the central cold plate 13 may include multiple parts, each part can be sandwiched between at least some of the battery cells 12. The central cold plate 13 can be provided with a flow channel for cooling fluid to flow, and the flow channel of the central cold plate 13 can communicate with other flow channels of the battery module 10. Thus, the central cold plate 13 is located between at least two battery cells 12 and in contact with at least two battery cells 12, which can further improve the cooling efficiency of the battery device 2, thereby improving the heat dissipation performance of the battery device 2.

[0077] Furthermore, in the same battery module 10, the central cold plate 13 contacts the first side surface 121 of two adjacent battery cells 12 and / or contacts the second side surface 122 of two adjacent battery cells 12. In this embodiment, the battery cell 12 can be a prismatic battery cell 12, and the outer shell of the prismatic battery cell 12 can have four sides, namely two first side surfaces 121 and two second side surfaces 122 arranged opposite to each other. The central cold plate 13 can contact the first side surface 121 of any two adjacent battery cells 12, or the central cold plate 13 can be located between some two adjacent battery cells 12, and simultaneously contact the first side surface 121 of two adjacent battery cells 12 and / or simultaneously contact the second side surface 122 of two adjacent battery cells 12. Thus, by contacting the first side surface 121 of two adjacent battery cells 12 and / or contacting the second side surface 122 of two adjacent battery cells 12, the cooling efficiency of the battery device 2 can be improved by the central cold plate 13, while also simplifying the structural design of the central cold plate 13.

[0078] See Figure 9 , Figure 9 This is a schematic diagram of the structure of a second embodiment of the battery module 10 according to one or more embodiments.

[0079] In the same battery module 10, the central cold plate 13 includes at least one first partition cold plate 131. The first partition cold plate 131 is sandwiched between the first side surfaces 121 of two adjacent battery cells 12 in the same battery group 123. The first partition cold plate 131 may be flat, and its surface area may be less than or equal to the surface area of ​​the first side surface 121. The first partition cold plate 131 may have a flow channel for cooling fluid to flow inside. Each first partition cold plate 131 is directly or indirectly connected to the end plate 111 and the side cold plate 112, so that the flow channel of each first partition cold plate 131 can be directly or indirectly connected to the flow channel of the end plate 111 and / or the flow channel of the side cold plate 112. Thus, by sandwiching the first partition cold plate 131 between the larger area of ​​the first side surfaces 121 of two adjacent battery cells 12, the structural design of the first partition cold plate 131 can be simplified while increasing the contact area between the first partition cold plate 131 and the battery cell 12, thereby improving the cooling efficiency of the battery module 10.

[0080] Furthermore, in any two adjacent battery cells 12, a first separating cold plate 131 is sandwiched between each pair of opposite first side surfaces 121. Thus, by sandwiching the first separating cold plate 131 between the larger area of ​​the first side surfaces 121 of two adjacent battery cells 12, the structural design of the first separating cold plate 131 can be simplified while increasing the contact area between the first separating cold plate 131 and the battery cell 12, thereby improving the cooling efficiency of the battery module 10.

[0081] See Figure 10 , Figure 10 This is a structural schematic diagram of a third embodiment of a battery module 10 according to one or more embodiments.

[0082] In the same battery module 10, there are at least two sets of battery groups 123, arranged along a first direction X. The central cold plate 13 includes at least one second partition cold plate 132. The second partition cold plate 132 is sandwiched between the first side surfaces 121 of two adjacent battery cells 12 in one set of battery groups 123, and between the first side surfaces 121 of two adjacent battery cells 12 in another set of adjacent battery groups 123. The number of battery groups 123 can be set according to actual conditions. For example, the number of battery groups 123 may include, but is not limited to, two, three, four, or other numbers. Multiple battery groups 123 can be arranged sequentially along the first direction X. The interior of the second partition cold plate 132 may be provided with a flow channel for cooling fluid. Each second partition cold plate 132 is directly or indirectly connected to the end plate 111 and the side cold plate 112, so that the flow channel of each second partition cold plate 132 can be directly or indirectly connected to the flow channel of the end plate 111 and the side cold plate 112. The second partition cold plate 132 can extend along the second direction Y. The second partition cold plate 132 can be flat. The second partition cold plate 132 can be sandwiched between two adjacent battery cells 12 in each of the two sets of battery groups 123. Thus, the second partition cold plate 132 is sandwiched between the first side surface 121 of two adjacent battery cells 12 in one set of battery groups 123, and between the first side surface 121 of two adjacent battery cells 12 in another set of adjacent battery groups 123. Through the simple structural design of the second partition plate, the contact area between the second partition cold plate 132 and the battery cells 12 can be increased, thereby improving the cooling efficiency of the battery module 10.

[0083] See Figure 11 , Figure 11 This is a structural schematic diagram of a fourth embodiment of a battery module 10 according to one or more embodiments.

[0084] In the same battery module 10, there are at least two battery groups 123, which are arranged along a first direction X. The central cold plate 13 includes at least one third partition cold plate 133, which is sandwiched between the two battery groups 123. The number of battery groups 123 can be set according to actual conditions. For example, the number of battery groups 123 can include, but is not limited to, two, three, four, or more groups, and multiple battery groups 123 can be arranged sequentially along the first direction X. Multiple battery cells 12 in each battery group 123 are arranged sequentially along a second direction Y, such that the first sides 121 of two adjacent battery cells 12 in the same group are arranged opposite each other. The third partition cold plate 133 may have a flow channel for cooling fluid to flow inside. Each third partition cold plate 133 is directly or indirectly connected to the end plate 111 and the side cold plate 112, so that the flow channel of each third partition cold plate 133 can be directly or indirectly connected to the flow channel of the end plate 111 and the side cold plate 112. The third partition cold plate 133 is sandwiched between the two battery groups 123, thereby enabling the battery groups 123 to be divided by the third partition cold plate 133, and cooling the battery groups 123 on both sides by the third partition cold plate 133, thereby improving the cooling efficiency of the battery module 10.

[0085] In some embodiments, a third partition cold plate 133 extends along the second direction Y, and the third partition plate contacts the second side surface 122 of each battery cell 12 of the battery packs 123 on both sides. The third partition cold plate 133 may be flat, and the third partition cold plate 133 may be sandwiched between the second side surface 122 of each battery cell 12 of the two battery packs 123, which can further improve the cooling efficiency of the battery module 10.

[0086] In summary, multiple battery modules 10 are arranged along the first direction X on the inter-group cooling component 20. This reduces the structural complexity of the inter-group cooling component 20 while allowing the multiple battery modules 10 to be cooled together. Each battery module 10 includes two end plates 111 and at least one set of battery groups 123. Each battery group 123 includes multiple battery cells 12 arranged sequentially along the second direction Y. The larger side 121 of each battery cell 12 is perpendicular to the second direction Y. The two end plates 111 are located on both sides of the battery group 123 along the second direction Y and contact the battery cells 12 on both sides. This allows the two end plates 111 to cool the battery cells 12 and also to limit and fix the battery group 123 along the second direction Y. This improves the space occupied by the battery cells 12 in the first direction X due to their arrangement along the first direction X, thereby increasing the energy density of the battery device 2 by making reasonable use of its space.

[0087] 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, The battery device includes: An inter-group cooling component is provided extending along a first direction; Multiple battery modules are arranged on the inter-group cooling component along the first direction. Each battery module includes two end plates and at least one group of battery cells. Each battery cell includes multiple battery cells arranged sequentially in a second direction perpendicular to the first direction. Each battery cell includes two first sides arranged opposite each other in the second direction and two second sides arranged opposite each other in the first direction. The area of ​​the first sides is larger than the area of ​​the second sides. The two end plates are located on both sides of the battery cell in the second direction and are in contact with the battery cells on both sides respectively.

2. The battery device according to claim 1, characterized in that, Each of the battery modules includes two side cold plates, which are arranged opposite to each other and spaced apart in the first direction. The two ends of one of the side cold plates are connected to the two end plates to form a hollow region, and the battery module is located in the hollow region.

3. The battery device according to claim 2, characterized in that, The battery module includes a cooling top plate, which connects the end plate and the side cold plate and covers the hollow area. The cooling top plate is in contact with the battery cell.

4. The battery device according to claim 3, characterized in that, The battery module includes a reinforcing member located on the side of the cooling top plate away from the hollow region. The reinforcing member extends along the second direction and is connected to the two end plates.

5. The battery device according to any one of claims 1 to 4, characterized in that, The inter-group cooling component includes cooling pipes, and each battery cell of each battery module is in direct contact with the cooling pipes.

6. The battery device according to claim 5, characterized in that, The battery device includes a battery housing with a receiving space, in which multiple battery modules and inter-module cooling components are disposed, and the cooling pipes are fixed to the wall of the battery housing.

7. The battery device according to any one of claims 1 to 6, characterized in that, The battery device includes an inter-module busbar that connects two adjacent battery modules.

8. The battery device according to claim 7, characterized in that, Each battery module includes a first busbar, and the first busbars of two adjacent battery modules are arranged opposite each other. The inter-module busbar includes at least one first pipe, and each first pipe connects to two opposite first busbars.

9. The battery device according to claim 8, characterized in that, Each battery module includes a second busbar spaced apart from the first busbar. The second busbars of two adjacent battery modules are arranged opposite each other. The inter-module busbar includes at least one second pipe, and each second pipe connects to two opposite second busbars.

10. The battery device according to any one of claims 1 to 9, characterized in that, The battery module includes a central cold plate, which is at least partially located between at least two of the battery cells and in contact with at least two of the battery cells.

11. The battery device according to claim 10, characterized in that, In the same battery module, the central cold plate contacts the first side of two adjacent battery cells and / or contacts the second side of two adjacent battery cells.

12. The battery device according to claim 11, characterized in that, In the same battery module, the central cold plate includes at least one first partition cold plate, and the first partition cold plate is sandwiched between the first sides of two adjacent battery cells in the same battery group.

13. The battery device according to claim 12, characterized in that, In any two adjacent battery cells, the first separating cold plate is sandwiched between each pair of opposite first sides.

14. The battery device according to claim 12 or 13, characterized in that, In the same battery module, the number of battery groups is at least two groups, and the at least two groups of battery groups are arranged along the first direction. The central cold plate includes at least one second dividing cold plate, which is sandwiched between the first sides of two adjacent battery cells in one group of battery groups and between the first sides of two adjacent battery cells in another group of adjacent battery groups.

15. The battery device according to any one of claims 10 to 13, characterized in that, In the same battery module, the number of battery groups is at least two groups, and the at least two groups of battery groups are arranged along the first direction. The central cold plate includes at least one third partition cold plate, which is sandwiched between the two groups of battery groups.

16. The battery device according to claim 15, characterized in that, The third partition plate extends along the second direction and contacts the second side of each battery cell of the battery group on both sides.

17. The battery device according to any one of claims 1 to 16, characterized in that, The battery device is provided with an inlet and an outlet, which are respectively connected to the flow channel of the battery module and / or the flow channel of the inter-module cooling component.

18. The battery device according to claim 17, characterized in that, The battery device includes an end manifold that connects the liquid inlet, the liquid outlet, the flow channel of the inter-group cooling component, and the flow channel of at least one of the battery modules.

19. The battery device according to claim 18, characterized in that, In the plurality of battery modules, the flow channel of the battery module closer to the end manifold is connected to the end manifold, and the flow channel of the battery module connected to the end manifold is connected to the flow channels of the other battery modules through the inter-group manifold.

20. An electrical appliance, characterized in that, The electrical device includes a battery device as described in any one of claims 1 to 19.

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