Battery device and electric device

Abstract

The utility model is applicable to the technical field of batteries, and provides a battery device and a power utilization device.The battery device comprises at least one battery monomer group, the battery monomer group comprises a plurality of battery monomers which are sequentially arranged in the first direction, and each battery monomer comprises a shell and an electrode assembly arranged in the shell; sub-flow channels are arranged in the wall body of the shell, the sub-flow channels in the plurality of battery monomers are sequentially communicated along a first direction to form a heat exchange flow channel, and the heat exchange flow channel is used for circulation of a heat exchange medium; interfaces communicated with the sub-runners are formed in the shell; and the interfaces of the two adjacent single batteries are connected in a sealing manner. The battery device provided by the embodiment of the utility model is lighter in structure and beneficial to realizing light weight.

Description

Technical Field

[0001] The present application relates to the technical field of battery thermal management, and particularly relates to a battery device and an electrical device. Background Art

[0002] Energy conservation and emission reduction are the keys to the sustainable development of the automotive industry. Electric vehicles have become an important part of the sustainable development of the automotive industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor related to their development.

[0003] Temperature has an important impact on the performance of batteries. Therefore, in conventional technologies, batteries are additionally provided with thermal management components for cooling the batteries or heating them up in a low-temperature environment to make them reach the normal operating temperature range. However, the thermal management components increase the weight of the batteries, which is not conducive to further lightweighting of electrical devices such as vehicles. Summary of the Utility Model

[0004] In view of this, embodiments of the present application provide a battery device and an electrical device, which can make the structure of the battery device lighter and more portable, and are conducive to lightweighting of the battery device and the electrical device.

[0005] An embodiment of the first aspect of the present application provides a battery device, including at least one battery cell group. The battery cell group includes a plurality of battery cells arranged in sequence along a first direction. Each battery cell includes a housing and an electrode assembly disposed inside the housing. A sub-channel is provided in the wall of the housing. The sub-channels in a plurality of battery cells are sequentially connected along the first direction to form a heat exchange channel for a heat exchange medium to flow through. An interface communicating with the sub-channel is provided on the housing, and the interfaces of two adjacent battery cells are sealingly connected.

[0006] In the battery device provided by the embodiments of the present application, a sub-channel is provided in the wall of the housing of the battery cell, and the interfaces of two adjacent battery cells are sealingly connected, enabling the sub-channels in two adjacent battery cells to be connected. A plurality of battery cells are arranged along the first direction and a plurality of sub-channels are sequentially connected along the first direction to form a heat exchange channel for a heat exchange medium to flow through for thermal management of the battery cell group. The above battery device directly provides a sub-channel in the wall of the housing of the battery cell and uses the sub-channel to circulate the heat exchange medium, omitting at least part of the thermal management components such as the water cooling plate in the traditional technology, making the structure of the battery device lighter and more portable, conducive to lightweighting of the battery device and the electrical device, and reducing costs at the same time. Moreover, the sub-channel is directly provided inside the housing of the battery cell, improving the heat exchange efficiency and having a good thermal management effect on the battery device, which is conducive to improving the performance stability and lifespan of the battery device.

[0007] In some embodiments, the wall of the outer shell includes a first wall, a sub-channel is provided inside the first wall, and the interface is provided on the first wall and extends along a first direction.

[0008] By adopting the above technical solution, two adjacent battery cells can be connected through the interface on the first wall, so that the adjacent sub-channels are connected, and the connection structure between the battery cells is relatively simple.

[0009] In some embodiments, the interface protrudes from the first wall, and the interfaces of two adjacent battery cells are connected by fitting or snap connection.

[0010] By adopting the above technical solution, the two interfaces can be connected by fitting or snap connection, and the connection is relatively stable; by splicing multiple battery cells in a plug-in manner, the number of battery cells can be quickly expanded to form a battery cell group, which is convenient for assembly.

[0011] In some embodiments, among the two interfaces connected by fitting, a ring-shaped first groove is provided on the outer surface of one interface, and a ring-shaped second groove is provided on the inner surface of the other interface, and the first groove and the second groove are fitted with each other to connect the two interfaces.

[0012] By adopting the above technical solution, the two interfaces are connected by fitting through the matching first groove and second groove, the contact area between the two interfaces is large, the connection strength is high and the sealing performance is good.

[0013] In some embodiments, a waterproof sealing structure is provided on the two connected interfaces.

[0014] By setting the waterproof sealing structure, the sealing performance at the interface connection is further improved, and the risk of leakage of the heat exchange medium is reduced.

[0015] In some embodiments, the outer shell includes two first walls, and the two first walls are arranged opposite to each other along a second direction, and the second direction intersects with the first direction; the first wall is the side wall with the largest area in the outer shell, sub-channels are provided inside both of the two first walls, and the sub-channels on both sides of the battery cell group along the second direction are respectively connected and respectively form heat exchange channels.

[0016] By adopting the above technical solution, it is beneficial to obtain a larger area for the sub-channel to improve the heat exchange effect; the two heat exchange channels on both sides of the battery cell group can perform heat exchange on both sides of the battery cell, further improving the heat exchange effect, and the thermal management effect is good.

[0017] In some embodiments, the two heat exchange channels on both sides of the battery cell group along the second direction are continuously connected to form a branch channel.

[0018] By adopting the above technical solution, a branch channel can heat exchange both sides of the battery cell group, with relatively high thermal management efficiency. Moreover, the structure of the branch channel is relatively simple, facilitating the connection of the heat exchange medium inlet and outlet.

[0019] In some embodiments, the multiple battery cells in the battery cell group include a first battery cell, at least one second battery cell, and a third battery cell arranged in sequence along a first direction; a sub-inlet for the inflow of the heat exchange medium and a sub-outlet for the outflow of the heat exchange medium are provided on one side of the first battery cell away from the second battery cell, and two interfaces are provided on the other side; two interfaces are provided on both sides of the second battery cell along the first direction; two interfaces are provided on one side of the third battery cell close to the second battery cell, and two channel connection ports are provided on the other side, where the channel connection ports are the openings at the ends of the sub-channels, and the two channel connection ports are connected and communicate with each other.

[0020] By adopting the above technical solution, the first battery cell, at least one second battery cell, and the third battery cell can be sequentially connected to form a connected branch channel to form a battery cell group; adjacent battery cells are connected through interfaces, facilitating grouping and forming the branch channel; the number of second battery cells can be set according to requirements, and the structure of the battery cell group is relatively flexible, with a lower manufacturing cost.

[0021] In some embodiments, the battery cell further includes a second wall connected between two first walls, and a communication channel is provided in the second wall of the third battery cell, and the communication channel connects the two channel connection ports.

[0022] By providing a communication channel in the second wall of the third battery cell, the branch channels on both sides of the battery cell group can be continuously connected, improving the sealing performance of the branch channel and saving the cost of channel connectors.

[0023] In some embodiments, the battery device further includes an inlet pipe and a return pipe, the sub-inlet is connected and communicates with the inlet pipe, and the sub-outlet is connected and communicates with the return pipe.

[0024] By adopting the above technical solution, a circulating channel is formed, facilitating heat exchange management.

[0025] In some embodiments, the number of battery cell groups is multiple, and the multiple battery cell groups are arranged in sequence along a second direction; the branch channels of the multiple battery cell groups are arranged in parallel, and each branch channel is respectively connected to the inlet pipe and the return pipe.

[0026] By adopting the above technical solution, all the multiple battery cell groups in the battery device can perform thermal management through the corresponding branch channels. Since the multiple branch channels are arranged in parallel, if a blockage or other faults occur in one branch channel, it will not affect the flow of the heat exchange medium in other branch channels, and the reliability of the thermal management of the battery device is relatively high.

[0027] In some embodiments, a plurality of main inlet ports are provided on the inlet pipe at intervals along the second direction, and the plurality of main inlet ports are in one-to-one correspondence and communication with the sub-inlet ports of the plurality of branch channels; a plurality of main return ports are provided on the return pipe at intervals along the second direction, and the plurality of main return ports are in one-to-one correspondence and communication with the sub-return ports of the plurality of branch channels.

[0028] By adopting the above technical solution, the inlet pipe is respectively connected to the sub-inlet ports of the plurality of branch channels through the plurality of main inlet ports, and the return pipe is respectively connected to the sub-return ports of the plurality of branch channels through the plurality of main return ports, realizing the parallel connection of the plurality of branch channels.

[0029] In some embodiments, a plurality of first flow dividing plates are further provided in the inlet pipe, and each first flow dividing plate is arranged at the main inlet port. One end of the first flow dividing plate is arranged on one side of the main inlet port, and the other end of the first flow dividing plate extends towards the inside of the inlet pipe.

[0030] By further providing a plurality of first flow dividing plates in the inlet pipe, the heat exchange medium in the inlet pipe can be divided, improving the uniformity of the flow into the plurality of branch channels.

[0031] In some embodiments, the main inlet port and the sub-inlet port are connected by fitting or snap connection; and / or, the main return port and the sub-return port are connected by fitting or snap connection.

[0032] By adopting the above technical solution, the connection strength between the main inlet port and the sub-inlet port is high and the sealing performance is good; and / or, the connection strength between the main return port and the sub-return port is high and the sealing performance is good.

[0033] In some embodiments, the sub-channel includes a plurality of straight sections and a bending section, and the plurality of straight sections are arranged at intervals along the first direction, and the bending section is connected between two adjacent straight sections.

[0034] By adopting the above technical solution, the sub-channel can obtain a larger channel area, cover as large an area of the first wall as possible, and has a higher heat exchange efficiency.

[0035] In some embodiments, the outer shell includes a housing formed by 3D printing.

[0036] By adopting the above technical solution, the housing is an integral structure formed by metal 3D printing, which can realize precise channel design; through high precision and simple design, material waste can be reduced and the overall cost can be lowered.

[0037] An embodiment of the second aspect of the present application proposes an electrical device, including the battery device as in the first aspect, and the battery device is used to provide electrical energy.

[0038] The above description is only an overview of the technical solution of the present application. In order to better understand the technical means of the present application, it can be implemented according to the content of the specification. And in order to make the above and other objects, features and advantages of the present application more obvious and understandable, the following specific embodiments of the present application are given. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of conventional technologies. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0040] Figure 1 is a schematic structural diagram of a vehicle provided by an embodiment of the present application;

[0041] Figure 2 is a schematic structural diagram of a battery device provided by an embodiment of the present application;

[0042] Figure 3 is an exploded schematic diagram of a battery cell provided by an embodiment of the present application;

[0043] Figure 4 is a schematic structural diagram of a battery device provided by an embodiment of the present application;

[0044] Figure 5 is Figure 4 a top view of the battery device shown;

[0045] Figure 6 is Figure 5 a cross-sectional view of the battery device shown along line A-A;

[0046] Figure 7 is Figure 5 a cross-sectional view of the battery device shown along line B-B;

[0047] Figure 8 is Figure 4 a front view of the battery device shown;

[0048] Figure 9 is Figure 8 a cross-sectional view of the battery device shown along line C-C;

[0049] Figure 10 is Figure 9 a partial enlarged view of part D in the battery device shown;

[0050] Figure 11 is a three-dimensional schematic diagram of a first battery cell provided by an embodiment of the present application;

[0051] Figure 12 is Figure 11 the front view of the first battery cell shown;

[0052] Figure 13 is Figure 11 the side view of the first battery cell shown;

[0053] Figure 14 is Figure 13 the cross-sectional view of the first battery cell shown along line E-E;

[0054] Figure 15 is the three-dimensional schematic diagram of the second battery cell provided by an embodiment of the present application;

[0055] Figure 16 is the three-dimensional schematic diagram of the third battery cell provided by an embodiment of the present application;

[0056] Figure 17 is the three-dimensional schematic diagram of two interfaces provided by an embodiment of the present application;

[0057] Figure 18 is Figure 17 the side view of the two interfaces shown;

[0058] Figure 19 is Figure 18 the cross-sectional view of the two interfaces shown along line F-F;

[0059] Figure 20 is the three-dimensional schematic diagram of the inlet pipe provided by an embodiment of the present application;

[0060] Figure 21 is Figure 20 the front view of the inlet pipe shown;

[0061] Figure 22 is Figure 21 the cross-sectional view of the inlet pipe shown along line G-G;

[0062] Figure 23 is Figure 22 the partial enlarged view of part H in the inlet pipe shown;

[0063] Figure 24 is the three-dimensional schematic diagram of the return pipe provided by some embodiments of the present application.

[0064] The meanings of the marks in the figure are:

[0065] 1000, vehicle; 100, battery device; 200, controller; 300, motor;

[0066] 10, box body; 11, upper box body; 12, lower box body;

[0067] 20, battery cell group;

[0068] 21. Battery cell; 21a. First battery cell; 21b. Second battery cell; 21c. Third battery cell;

[0069] 211. Housing; 211a. Shell; 211b. End cap; 2111. First wall; 2112. Interface; 2113. Second wall; 213. Electrode assembly; 214. Electrode terminal; 215. Pressure relief mechanism;

[0070] 22. Branch flow channel; 221. Heat exchange flow channel; 222. Connecting flow channel; 2221. Flow channel connection port; 2211. Sub-flow channel; 22111. Inlet port; 22112. Return port; 22113. Straight flow section; 22114. Bending section;

[0071] 30. Inlet pipe; 31. Main inlet port; 32. First flow dividing plate;

[0072] 40. Return pipe; 41. Main return port. Detailed implementation mode

[0073] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0074] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0075] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, "a plurality of" means two or more unless otherwise specifically defined.

[0076] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0077] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0078] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0079] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0080] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0081] The battery cells can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., which are not limited in the embodiments of the present application.

[0082] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, parallel, or hybrid via a busbar.

[0083] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.

[0084] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing multiple battery cells to form an independent module. As an example, the battery module may be formed by bundling multiple battery cells with a cable tie.

[0085] In some embodiments, the battery device may be a battery pack, which includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0086] As an example, the battery cell assembly may be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0087] As an example, the battery cell assembly can also be accommodated in the box body by directly fixing a plurality of battery cells to the box body.

[0088] Currently, from the perspective of the development of the market situation, the application of power batteries is becoming more and more extensive. Power batteries are not only applied to energy storage power systems such as hydropower, thermal power, wind power, and solar power stations, but also widely applied to electric transportation tools such as electric bicycles, electric motorcycles, and electric vehicles, as well as other fields. With the continuous expansion of the application fields of power batteries, the market demand for them is also continuously increasing.

[0089] A battery generally includes battery cells and a box body. The battery cells are placed in the box body, and the box body can provide a accommodation space for the battery cells and play a certain protective role. For a battery, the battery cell is the component where the actual electrochemical reaction occurs.

[0090] When an electrochemical reaction occurs inside the battery cell, heat will be generated accordingly. As the battery is cycled, the battery cell continuously generates heat, causing the temperature inside the battery to gradually rise. When the temperature exceeds the allowable range, it will affect the performance and lifespan of the battery. Therefore, currently, a thermal management component is usually provided inside the battery to cool the battery or heat it up in a low-temperature environment to make it reach the normal operating temperature range.

[0091] Currently, a commonly used thermal management component is a water-cooling plate. The water-cooling plate is usually formed by combining an upper plate and a lower plate, and flow channels are provided on one or both of the plates. After the two plates are joined together, a coolant flow channel is formed. However, thermal management components such as water-cooling plates increase the weight of the battery, which is not conducive to further weight reduction of electrical devices such as vehicles.

[0092] Based on the above considerations, one or more embodiments of the present application provide a battery device, including at least one battery cell group. The battery cell group includes a plurality of battery cells arranged in sequence along a first direction. The battery cell includes a housing and an electrode assembly provided inside the housing; a sub-flow channel is provided in the wall body of the housing, and the sub-flow channels in a plurality of battery cells are sequentially communicated along the first direction to form a heat exchange flow channel, and the heat exchange flow channel is used for the circulation of a heat exchange medium.

[0093] In the battery device provided by the embodiment of the present application, a sub-channel is provided inside the outer shell of the battery cell, and the sub-channels in a plurality of battery cells are connected in sequence to form a heat exchange channel. The heat exchange channel can supply a heat exchange medium to flow through to perform thermal management on the battery cell. The battery device does not need to be provided with additional thermal management components such as a water cooling plate, making the structure of the battery device lighter, which is beneficial to the power-consuming device to achieve lightweight, and at the same time reduces the cost; moreover, the sub-channel is directly provided inside the outer shell of the battery cell, improving the heat exchange efficiency, and the thermal management effect of the battery device is better, which is beneficial to improving the performance stability and lifespan of the battery device.

[0094] The embodiment of the present application provides a power-consuming device using the battery device as a power source. The power-consuming device can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, and the like. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric airplane toy, and the like. The spacecraft can include an airplane, a rocket, a space shuttle, a spaceship, and the like. For the convenience of description in the following embodiments, a vehicle is taken as an example of a power-consuming device in an embodiment of the present application for illustration.

[0095] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A battery device 100 is disposed inside the vehicle 1000. The battery device 100 can be disposed at the bottom, the head, or the tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000. For example, the battery device 100 can be used as an operating power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0096] In some embodiments of the present application, the battery device 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0097] Reference Figure 2 , Figure 2This is a schematic diagram of the structure of a battery device 100 according to one embodiment of the present application. The battery device (Battery Apparatus) mentioned in this embodiment of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) may include multiple battery cells 21, which are connected in series, parallel, or hybrid via a busbar.

[0098] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells 21. For example, the battery cell assembly may be a battery module, which is formed by arranging and securing multiple battery cells 21 to form a single module. For example, a battery module may be formed by bundling multiple battery cells 21 using cable ties.

[0099] In some embodiments, the battery device 100 may be a battery pack, which includes a case 10 and one or more battery cell assemblies, wherein the battery cell assemblies are housed in the case 10 .

[0100] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box body by fixing the battery module to the box body 10 .

[0101] As an example, the battery cell assembly may also be housed in the case 10 by directly fixing the plurality of battery cells 21 to the case 10 .

[0102] As an example, the housing 10 may include an upper housing 11 and a lower housing 12. The upper housing 11 and the lower housing 12 are engaged to form a closed chamber within the housing 10 for accommodating the battery cell assembly. The term "closed" here refers to covering or closing, and may be sealed or unsealed.

[0103] As an example, the box body 10 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed receiving cavity is formed inside the box body 10 to accommodate the battery cell group 20.

[0104] As an example, the box 10 may serve as part of the chassis structure of the vehicle 1000. For example, the roof of the box 10 may become at least a part of the floor of the vehicle 1000, or the frame of the box 10 may become at least a part of the cross member and longitudinal member of the vehicle 1000.

[0105] In some embodiments, the battery device 100 refers to an energy storage device, which includes a housing 10 with a door on at least one side of the housing 10. The energy storage device includes an energy storage container, an energy storage cabinet, and the like.

[0106] Figure 3It is an exploded view of the battery cell 21 provided by an embodiment of the present application. Please refer to Figure 3 , the battery cell 21 refers to the smallest unit that makes up the battery device. The battery cell 21 includes a housing 211, an electrode assembly 213, and an electrolyte, and both the electrode assembly 213 and the electrolyte are accommodated in the housing 211.

[0107] The housing 211 includes a housing body 211a and an end cap 211b. The end cap 211b refers to a component that covers the opening of the housing body 211a to isolate the internal environment of the battery cell 21 from the external environment. The shape of the end cap 211b can be adapted to the shape of the housing body 211a to cooperate with the housing body 211a. Optionally, the end cap 211b can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap 211b is not easily deformed when subjected to extrusion and collision, enabling the battery cell 21 to have higher structural strength and improved safety performance. Functional components such as electrode terminals and explosion-proof valves can be provided on the end cap 211b. The electrode terminal can be used for electrically connecting with the electrode assembly 213 to output or input the electrical energy of the battery cell 21. In some embodiments, a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 21 reaches a threshold can also be provided on the end cap 211b. The material of the end cap 211b can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special restrictions on this. In some embodiments, an insulating member can be provided on the inner side of the end cap 211b to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0108] The housing body 211a is a component used to cooperate with the end cap 211b to form the internal environment of the battery cell 21. Among them, the formed internal environment can be used to accommodate the electrode assembly 213, the electrolyte, and other components. The housing body 211a and the end cap 211b can be independent components. An opening can be provided on the housing body 211a, and the end cap 211b is covered at the opening to form the internal environment of the battery cell 21. Without limitation, the end cap 211b and the housing body 211a can also be integrated. Specifically, the end cap 211b and the housing body 211a can first form a common connection surface before other components are put into the housing, and when it is necessary to encapsulate the inside of the housing body 211a, the end cap 211b is then covered on the housing body 211a. The housing body 211a can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing body 211a can be determined according to the specific shape and size of the electrode assembly 213. The material of the housing body 211a can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special restrictions on this.

[0109] The electrode assembly 213 is a component in the battery cell 21 where electrochemical reactions occur. One or more electrode assemblies 213 can be contained within the housing 211a. The electrode assembly 213 is mainly formed by winding or laminating a positive electrode sheet and a negative electrode sheet, and generally, a separator is provided between the positive electrode sheet and the negative electrode sheet. The portions of the positive electrode sheet and the negative electrode sheet having active materials constitute the main body of the electrode assembly 213, and the portions of the positive electrode sheet and the negative electrode sheet without active materials respectively constitute the electrode tabs. The positive electrode tab and the negative electrode tab can be located together at one end of the main body of the electrode sheet or separately at both ends of the main body of the electrode sheet. During the charging and discharging process of the battery device 100, the positive active material and the negative active material react with the electrolyte, and the electrode tabs are connected to the electrode terminals to form a current loop.

[0110] Please refer to Figures 2 to 8 , an embodiment of the first aspect of the present application provides a battery device 100, including at least one battery cell group 20. The battery cell group 20 includes a plurality of battery cells 21 arranged in sequence along a first direction X. The battery cell 21 includes a housing 211 and an electrode assembly 213 disposed within the housing 211. A sub-channel 2211 is provided within the wall of the housing 211. The sub-channels 2211 in a plurality of battery cells 21 are sequentially connected along the first direction X to form a heat exchange channel 221. The heat exchange channel 221 is used for the circulation of a heat exchange medium. An interface 21,12 connected to the sub-channel 2211 is provided on the housing 211, and the interfaces 21,12 of two adjacent battery cells 21 are sealingly connected.

[0111] The battery cell group 20 refers to a plurality of battery cells 21 arranged in sequence along the first direction X. The number of battery cells 21 can be two or more, and the sub-channels 2211 of the plurality of battery cells 21 are sequentially connected. For example, the first direction X is the length direction of the battery cell 21. In other embodiments, the first direction X can also be other directions, such as the width direction of the battery cell 21.

[0112] In the battery device 100, a plurality of battery cells 21 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that there are both series and parallel connections among the plurality of battery cells 21. A plurality of battery cells 21 can be directly connected in series, in parallel, or in a mixed connection together. Of course, the battery device 100 can also be such that a plurality of battery cells 21 are first connected in series, in parallel, or in a mixed connection to form a battery module, and then a plurality of battery modules are connected in series, in parallel, or in a mixed connection to form an integral body. The battery device 100 can also include a current collecting component for realizing the electrical connection among the plurality of battery cells 21.

[0113] The plurality of battery cells 21 in the battery cell group 20 can, but are not limited to, be directly connected to each other to form a battery module. That is to say, the battery cell group 20 is not necessarily the same as the above-mentioned battery module.

[0114] The battery cell 21 includes a housing 211 and an electrode assembly 213 disposed within the housing 211. The shape of the housing 211 can be a flat body, a cuboid, or other shapes.

[0115] The sub-channel 2211 is disposed within the wall body of the housing 211. Among them, the housing 211 includes a plurality of wall bodies, and the sub-channel 2211 is disposed within at least one wall body. For example, the sub-channel 2211 can be disposed on the side wall and / or the bottom wall of the housing 211.

[0116] The structure of the sub-channel 2211 can be various. For example, the sub-channel 2211 is a flow channel hole formed inside the wall body, or the sub-channel 2211 is a flow channel formed by dividing the inside of the wall body through a dividing structure. The sub-channel 2211 can be various shapes, such as linear, broken line, S-shaped, etc.

[0117] Since a plurality of battery cells 21 are arranged in sequence along the first direction X, the sub-channels 2211 inside the plurality of battery cells 21 can be connected in sequence along the first direction X to form a heat exchange flow channel 221. When the number of battery cell groups 20 is multiple, the heat exchange flow channels 221 in the multiple battery cell groups 20 can be connected in series, in parallel, or in a series-parallel hybrid connection. When the heat exchange medium flows in the heat exchange flow channel 221, it can exchange heat with the battery cell group 20 to adjust the temperature of the battery cell group 20, including cooling and heating the battery cell group 20. The heat exchange medium can be water, air, coolant, etc.

[0118] The interface 2112 is used to connect two adjacent battery cells 21 and connect two adjacent sub-channels 2211. In one battery cell 21, the interface 2112 is connected to the sub-channel 2211. Optionally, the interface 2112 is located at the head or end of the sub-channel 2211. Every two adjacent battery cells 21 arranged along the first direction X are hermetically connected through the corresponding interface 2112. Among them, the interfaces 2112 of the two battery cells 21 can be directly hermetically connected, or can be hermetically connected through an intermediate connector such as a water pipe.

[0119] Since the interfaces 2112 of two adjacent battery cells 21 are hermetically connected, the sub-channels 2211 in the two adjacent battery cells 21 can be connected through the corresponding interfaces 2112, and the sealing performance is good, and the heat exchange medium is not easily leaked; and, a plurality of battery cells 21 can be connected in sequence to form a heat exchange flow channel 221, which is convenient for the heat exchange medium to flow in the battery cell group 20 and is easy to implement.

[0120] In the battery device 100 provided by the embodiment of the present application, a sub-channel 2211 is provided in the wall body of the outer shell 211 of the battery cell 21. The interfaces 2112 of two adjacent battery cells 21 are sealed and connected, enabling the sub-channels 2211 in the two adjacent battery cells 21 to communicate with each other. Since multiple battery cells 21 in the battery cell group 20 are arranged in sequence along the first direction X, the sub-channels 2211 of the multiple battery cells 21 can communicate with each other in sequence along the first direction X to form a heat exchange channel 221. The heat exchange channel 221 can supply a heat exchange medium to flow through, so as to perform thermal management on the battery cell group 20. The above battery device 100 directly sets the sub-channel 2211 in the wall body of the outer shell 211 and uses the sub-channel 2211 to flow the heat exchange medium, omitting at least part of the thermal management components such as the water cooling plate in the traditional technology, making the structure of the battery device 100 lighter, which is beneficial to the battery device 100 and the electric device applied thereto to achieve light weight, and at the same time reducing the cost; moreover, the sub-channel 2211 is directly arranged in the outer shell 211, improving the heat exchange efficiency, and the battery device 100 has a good thermal management effect, which is beneficial to improving the performance stability and service life of the battery device 100.

[0121] In addition, the battery device 100 also reduces the space occupancy rate of the thermal management components in the battery device 100, reduces the space waste of the battery device 100, and is beneficial to improving the volume energy density of the battery device 100.

[0122] Please refer to Figures 6 to 19 , in some embodiments, the wall body of the outer shell 211 includes a first wall 2111, and the sub-channel 2211 is provided in the first wall 2111; the interface 2112 is arranged on the first wall 2111 and along the first direction X.

[0123] The first wall 2111 can be the large surface of the battery cell 21, or the side wall connected to the large surface, or the bottom wall opposite to the end cover.

[0124] Since the extending direction of the interface 2112 is consistent with the arrangement direction of the battery cells 21, the two interfaces 2112 can be conveniently connected. Optionally, the interface 2112 protrudes from the outside of the first wall 2111; optionally, one interface 2112 can be arranged inside the first wall 2111, and the other interface 2112 protrudes from the outside of the first wall 2111 and is inserted into the adjacent interface 2112.

[0125] By adopting the above technical solution, two adjacent battery cells 21 can be connected through the interfaces 2112 on the first wall 2111, so that the adjacent sub-channels 2211 communicate with each other, and the connection structure between the battery cells 21 is relatively simple; since the adjacent interfaces 2112 are sealed and connected, the heat exchange medium is not easy to leak, and the reliability of the battery device 100 is better.

[0126] Please refer toFigure 8 , Figures 17 to 19 , in some embodiments, the interface 2112 protrudes from the first wall 2111, and the interfaces 2112 of two adjacent battery cells 21 are fitted or snap-connected.

[0127] The interface 2112 protrudes from the outer side of the first wall 2111 and extends along the first direction X, that is, the interface 2112 is a protruding socket for facilitating the connection of adjacent interfaces 2112. Among them, the interfaces 2112 corresponding to two adjacent battery cells 21 are fitted or snap-connected.

[0128] As Figures 17 to 19 shown, the two interfaces 2112 are fitted, that is, the two interfaces 2112 are internally and externally fitted and in close contact, and the connection strength between the two interfaces 2112 is high and the sealing performance is good.

[0129] The two interfaces 2112 can also be snap-connected. For example, a slot and a clamping protrusion are respectively provided on the two interfaces 2112, and the clamping protrusion is clamped in the slot.

[0130] By adopting the above technical solution, the interface 2112 protrudes from the first wall 2111 and extends along the first direction X, and two adjacent battery cells 21 can be directly connected to each other through the interface 2112; the two interfaces 2112 can be fitted or snap-connected, and the connection is relatively stable; by splicing multiple battery cells 21 in a plug-in manner, the number of battery cells 21 can be quickly expanded to form a battery cell group 20, which is convenient for assembly.

[0131] As Figures 17 to 19 shown, in some embodiments, among the two fitted interfaces 2112, a ring-shaped first groove is provided on the outer surface of one interface 2112, and a ring-shaped second groove is provided on the inner surface of the other interface 2112, and the first groove and the second groove are fitted with each other to connect the two interfaces 2112.

[0132] The cross-section of the interface 2112 can be circular or oval. Optionally, the interface 2112 is a flat tube. Among the two fitted interfaces 2112, a ring-shaped first groove is provided on the outer surface of one interface 2112, the first groove is arranged around the circumferential side of the interface 2112, and the first groove can be located at the end of the interface 2112 along the first direction X; a ring-shaped second groove is provided on the inner surface of the other interface 2112, the second groove is arranged around the inner wall of the interface 2112, and the second groove can be located at the end of this interface 2112 along the first direction X close to the first groove. The first groove and the second groove are fitted with each other to connect the two interfaces 2112.

[0133] Optionally, the outer surfaces of the two interfaces 2112 are flush, so that the space occupied by the interface 2112 is less.

[0134] By adopting the above technical solution, the two interfaces 2112 are fitted and connected through the matching first groove and second groove. The contact area between the two interfaces 2112 is relatively large, and the connection strength is high and the sealing performance is good.

[0135] In some embodiments, a waterproof sealing structure is provided on the two connected interfaces 2112.

[0136] The waterproof sealing structure is located at the junction of the two interfaces 2112. The waterproof sealing structure can be a waterproof sealant, a waterproof sealing ring and other structures.

[0137] By providing the waterproof sealing structure, the sealing performance of the connection of the interface 2112 is further improved, and the risk of leakage of the heat exchange medium is reduced.

[0138] Please refer to Figures 4 to 10 , in some embodiments, the housing 211 includes two first walls 2111, and the two first walls 2111 are oppositely arranged along the second direction Y. The second direction Y intersects with the first direction X; the first wall 2111 is the side wall with the largest area in the housing 211, and sub-channels 2211 are provided in both of the two first walls 2111. The sub-channels 2211 on both sides of the battery cell group 20 along the second direction Y are respectively communicated to form heat exchange channels 221.

[0139] Optionally, the second direction Y is perpendicularly intersecting with the first direction X, and the second direction Y can be the width direction of the battery cell 21.

[0140] The housing 211 includes two first walls 2111. The first wall 2111 is the side wall with the largest area in the housing 211, that is, the first wall 2111 is the large surface of the battery cell 21. Sub-channels 2211 are provided in both of the two first walls 2111. Thus, the sub-channels 2211 on both sides of the battery cell group 20 along the second direction Y respectively form a heat exchange channel 221. The two heat exchange channels 221 can be arranged in series or in parallel.

[0141] By adopting the above technical solution, the area of the first wall 2111 is relatively large, and the heat generation amount of the first wall 2111 is also relatively large. By arranging the sub-channel 2211 inside the first wall 2111, it is beneficial for the sub-channel 2211 to obtain a relatively large area to improve the heat exchange effect; sub-channels 2211 are provided in both of the two first walls 2111 of the battery cell 21. Thus, the two heat exchange channels 221 on both sides of the battery cell group 20 can perform heat exchange on both sides of the battery cell 21, further improving the heat exchange effect and having a good thermal management effect.

[0142] In some embodiments, the two heat exchange channels 221 on both sides of the battery cell group 20 along the second direction Y are continuously communicated to form a branch channel 22.

[0143] The two heat exchange channels 221 on both sides of the battery cell group 20 along the second direction Y are continuously connected, that is, the two heat exchange channels 221 are in series. The heat exchange medium flows from one heat exchange channel 221 through one side of the battery cell group 20 along the second direction Y and then flows to the other side of the battery cell group 20 along the second direction Y.

[0144] By adopting the above technical solution, one branch channel 22 can exchange heat on both sides of the battery cell group 20, and the heat management efficiency is relatively high. In addition, the structure of the branch channel 22 is relatively simple, which is convenient for connecting the heat exchange medium inlet and outlet.

[0145] Please refer to Figures 3 to 16 , in some embodiments, the multiple battery cells 21 in the battery cell group 20 include a first battery cell 21a, at least one second battery cell 21b, and a third battery cell 21c arranged in sequence along the first direction X; a sub-inlet 22111 for the heat exchange medium to flow in and a sub-outlet 22112 for the heat exchange medium to flow out are provided on one side of the first battery cell 21a away from the second battery cell 21b, and two interfaces 2112 are provided on the other side; two interfaces 2112 are provided on both sides of the second battery cell 21b along the first direction X; two interfaces 2112 are provided on one side of the third battery cell 21c close to the second battery cell 21b, and two channel connection ports 2221 are provided on the other side. The channel connection ports 2221 are the openings at the ends of the sub-channel 2211, and the two channel connection ports 2221 are connected to each other.

[0146] In the embodiments of the present application, according to the different structures of the battery cells 21, the multiple battery cells 21 are divided into a first battery cell 21a, a second battery cell 21b, and a third battery cell 21c. The first battery cell 21a is used to connect to the current collector, the third battery cell 21c is used to connect the two heat exchange channels 221, the second battery cell 21b is arranged between the first battery cell 21a and the second battery cell 21b, the number of the second battery cells 21b can be set to one or more, and the multiple battery cells 21 are arranged in sequence along the first direction X.

[0147] A sub-inlet 22111 and a sub-outlet 22112 are provided on one side of the first battery cell 21a along the first direction X, and two interfaces 2112 are provided on the other side. The two interfaces 2112 are respectively located on two first walls 2111 of the first battery cell 21a.

[0148] One interface 2112 is provided on each side of each first wall 2111 of the second battery cell 21b along the first direction X, that is, two interfaces 2112 are respectively formed on both sides of the second battery cell 21b along the first direction X.

[0149] On one side of the third battery cell 21c close to the second battery cell 21b, there are two interfaces 2112, and on the other side, there is a flow channel connection port 2221. The two flow channel connection ports 2221 can be directly connected or connected through external connecting parts such as connecting pipes, so that the two heat exchange flow channels 221 can be continuously connected.

[0150] In the above-mentioned 20 battery cells of the battery cell group, the flow path of the heat exchange medium is as follows: The heat exchange medium flows into the sub-flow channel 2211 of the first battery cell 21a from the sub-inlet 22111 of the first battery cell 21a, flows from the interface 2112 of the first battery cell 21a into the sub-flow channel 2211 of the second battery cell 21b, then flows from the sub-flow channel 2211 of the second battery cell 21b into the sub-flow channel 2211 of another second battery cell 21b or into the sub-flow channel 2211 of the third battery cell 21c, and then flows through the flow channel connection port 2221 into the sub-flow channel 2211 on the other side of the third battery cell 21c, and then flows out from the sub-outlet 22112 of the first battery cell 21a via the sub-flow channel 2211 of the second battery cell 21b and the sub-flow channel 2211 of the first battery cell 21a.

[0151] By adopting the above technical solutions, the first battery cell 21a, at least one second battery cell 21b, and the third battery cell 21c can be connected in sequence to form a connected branch flow channel 22 to form a battery cell group 20; adjacent battery cells 21 are connected through the interface 2112, which is convenient for grouping and forming the branch flow channel 22; the number of the second battery cells 21b can be set according to requirements, and the structure of the battery cell group 20 is relatively flexible and the manufacturing cost is relatively low. The above battery device 100 can achieve rapid iteration and optimized design to meet the ever-changing market demands and technical challenges.

[0152] In some other embodiments, the battery cell group 20 can be of other structures. For example, the battery cell group 20 includes one first battery cell 21a and one third battery cell 21c. Another example is that the battery cell group 20 includes one battery cell 21 and multiple second battery cells 21b, and the heat exchange flow channel 221 can also be formed.

[0153] Please refer to Figures 3 to 7 , in some embodiments, the battery cell 21 further includes a second wall 2113 connected between the two first walls 2111. A communication flow channel 222 is provided in the second wall 2113 of the third battery cell 21c, and the communication flow channel 222 connects the two flow channel connection ports 2221.

[0154] The third battery cell 21c is located at the end of the battery cell group 20 along the first direction X. By arranging a flow channel in the second wall 2113 of the third battery cell 21c, the branch channels 22 on both sides of the battery cell group 20 can be connected continuously, improving the sealing performance of the branch channels 22 and saving the cost of the flow channel connectors.

[0155] Please refer to Figures 3 to 24 , in some embodiments, the battery device 100 further includes an inlet pipe 30 and a return pipe 40. The sub-inlet port 22111 is connected to and communicates with the inlet pipe 30, and the sub-return port 22112 is connected to and communicates with the return pipe 40.

[0156] The inlet pipe 30 and the return pipe 40 can be pipe bodies provided independently of the battery cell group 20, and the materials can be plastics, metals, etc.; the inlet pipe 30 and the return pipe 40 can also be flow channels provided inside the box body 10, for example, flow channels provided in the beam body of the box body 10.

[0157] The inlet pipe 30 communicates with the sub-inlet port 22111 of the first battery cell 21a to provide a heat exchange medium to the heat exchange flow channel 221; the return pipe 40 communicates with the sub-return port 22112 of the first battery cell 21a to supply the heat exchange medium in the heat exchange flow channel 221 to return, thereby forming a circulating flow channel, which is convenient for heat exchange management.

[0158] In some embodiments, the number of the battery cell groups 20 is multiple, and the multiple battery cell groups 20 are arranged in sequence along the second direction Y; the branch channels 22 of the multiple battery cell groups 20 are arranged in parallel, and each branch channel 22 is respectively connected to the inlet pipe 30 and the return pipe 40.

[0159] The multiple battery cell groups 20 can respectively form multiple branch channels 22, and each branch channel 22 is respectively connected to the inlet pipe 30 and the return pipe 40, so that the multiple branch channels 22 are arranged in parallel.

[0160] Optionally, the inlet pipe 30 and the return pipe 40 are arranged on one side of the box body 10 along the first direction X, and only one water inlet for the inlet pipe 30 to pass through and one water outlet for the return pipe 40 to pass through are provided on the box body 10.

[0161] By adopting the above technical solution, each of the multiple battery cell groups 20 in the battery device 100 can perform heat management through the corresponding branch channel 22. Since the multiple branch channels 22 are arranged in parallel, if a fault such as blockage occurs in one branch channel 22, it will not affect the flow of the heat exchange medium in other branch channels 22, and the reliability of the heat management of the battery device 100 is relatively high.

[0162] In other embodiments, the multiple branch channels 22 can also be arranged in series or in a mixed connection.

[0163] In some embodiments, a plurality of main inlet ports 31 are provided on the inlet pipe 30 at intervals along the second direction Y, and the plurality of main inlet ports 31 are in one-to-one correspondence and communication with the sub-inlet ports 22111 of the plurality of branch channels 22; a plurality of main return ports 41 are provided on the return pipe 40 at intervals along the second direction Y, and the plurality of main return ports 41 are in one-to-one correspondence and communication with the sub-return ports 22112 of the plurality of branch channels 22.

[0164] The inlet pipe 30 is respectively connected to the sub-inlet ports 22111 of the plurality of branch channels 22 through the plurality of main inlet ports 31, and the return pipe 40 is respectively connected to the sub-return ports 22112 of the plurality of branch channels 22 through the plurality of main return ports 41, realizing the parallel connection of the plurality of branch channels 22.

[0165] In some embodiments, a plurality of first flow dividing plates 32 are further provided in the inlet pipe 30. Each first flow dividing plate 32 is disposed at the main inlet port 31. One end of the first flow dividing plate 32 is disposed on one side of the main inlet port 31, and the other end of the first flow dividing plate 32 extends toward the inside of the inlet pipe 30 and forms a gap with the inner wall of the inlet pipe 30.

[0166] One end of the first flow dividing plate 32 is connected to the inner wall of the inlet pipe 30, and the other end extends toward the inside of the inlet pipe 30 and forms a gap with the inner wall on the other side of the inlet pipe 30.

[0167] The plurality of first flow dividing plates 32 may have the same length to improve the uniformity of flow division; the plurality of first flow dividing plates 32 may also be set to different lengths, which can be specifically set according to requirements. For example, the length of the first flow dividing plate 32 near the middle of the battery device 100 is greater than the length of the first flow dividing plate 32 near the edge of the battery device 100 to improve the heat exchange efficiency of the middle battery cell group 20.

[0168] By providing a plurality of first flow dividing plates 32 in the inlet pipe 30, the heat exchange medium in the inlet pipe 30 can be divided, and the uniformity of the inlet flow in the plurality of branch channels 22 can be improved.

[0169] In other embodiments, the first flow dividing plate 32 can be omitted, and the heat exchange medium can also flow to each branch channel 22 respectively; the first flow dividing plate 32 can also be replaced by a valve body or other flow dividing structures, or the apertures of the plurality of main inlet ports 31 can be different to adjust the flow rate.

[0170] The structure of the return pipe 40 can be the same as or similar to the structure of the inlet pipe 30 to enable the stable flow of the heat exchange medium. In some embodiments, a plurality of second flow dividing plates are provided in the return pipe 40, and each second flow dividing plate is disposed at the main return port 41. One end of the second flow dividing plate is disposed on one side of the main return port 41, and the other end of the second flow dividing plate extends toward the inside of the return pipe 40.

[0171] In some embodiments, the main inlet 31 is fitted and connected or snap-connected to the sub-inlet 22111; and / or, the main return port 41 is fitted and connected or snap-connected to the sub-return port 22112.

[0172] Both the main inlet 31 and the sub-inlet 22111 can be plug-in ports provided in a protruding manner. For example, both the main inlet 31 and the sub-inlet 22111 extend along the first direction X; the main inlet 31 and the sub-inlet 22111 can be conveniently connected, with high connection strength and good sealing performance.

[0173] Both the main return port 41 and the sub-return port 22112 can be plug-in ports provided in a protruding manner. For example, both the main return port 41 and the sub-return port 22112 extend along the first direction X; the main return port 41 and the sub-return port 22112 can be conveniently connected, with high connection strength and good sealing performance.

[0174] Optionally, the main inlet 31, the sub-inlet 22111, the main inlet 31, and the sub-inlet 22111 can all be flat tubular.

[0175] Optionally, the sub-inlet 22111 and the sub-return port 22112 are arranged at intervals along the height direction of the first battery cell 21a, so that the sub-inlet 22111 and the sub-return port 22112 are staggered, facilitating the connection of the inlet pipe 30 and the return pipe 40.

[0176] Please refer to Figure 6 and Figure 14 , in some embodiments, the sub-channel 2211 includes a plurality of straight sections 22113 and bent sections 22114. The plurality of straight sections 22113 are arranged at intervals along the first direction X, and the bent section 22114 is connected between two adjacent straight sections 22113.

[0177] The straight section 22113 can extend along the height direction of the battery cell 21 (the Z direction in the figure). The number of the straight sections 22113 can be two or more. Every two adjacent straight sections 22113 are connected by a bent section 22114 to form a continuous sub-channel 2211, and the sub-channel 2211 is generally in an S shape.

[0178] By adopting the above technical solution, the sub-channel 2211 can obtain a larger channel area, cover as large an area of the battery cell 21 as possible, and have a higher heat exchange efficiency.

[0179] In some embodiments, the outer shell 211 includes a housing 211a formed by 3D printing.

[0180] The housing 211 includes a housing body 211a and an end cap 211b. The housing body 211a is formed by 3D printing to form a sub-channel 2211 inside the wall of the housing 211. For example, the housing body 211a is an aluminum shell or a steel shell, and can also be made of other metal materials, or can be made of plastic materials. By way of example, the printing material of the housing body 211a is aluminum alloy powder, and the printing device is a metal printing device, such as a metal powder sintering device, Wire Arc Additive Manufacturing (WAAM), or an additive and subtractive composite device.

[0181] In this way, the housing body 211a is an integral structure formed by 3D printing, which can achieve precise flow channel design; through high precision and simple design, material waste can be reduced and the overall cost can be lowered.

[0182] In other embodiments, the housing body 211a can also be made by other means. For example, the first wall 2111 includes a first sub-wall and a second sub-wall arranged opposite to each other. First, a flow channel separation structure is provided on the first sub-wall, and then the second sub-wall is covered with the first sub-wall to enclose the sub-channel 2211.

[0183] Please refer to Figures 1 to 24 , some embodiments of the present application provide a battery device 100, including a battery cell group 20. The battery cell group 20 includes a plurality of battery cells 21 arranged in sequence along a first direction X. The battery cell 21 includes a housing 211 and an electrode assembly 213 disposed inside the housing 211. The housing 211 includes a first wall 2111, and a sub-channel 2211 is provided inside the first wall 2111. The sub-channels 2211 in the plurality of battery cells 21 are sequentially connected along the first direction X to form a heat exchange channel 221. The heat exchange channel 221 is used for the circulation of a heat exchange medium. An interface 2112 extending along the first direction X is provided on the first wall 2111, and the interface 2112 is connected to the sub-channel 2211. Two adjacent battery cells 21 are hermetically connected through corresponding interfaces 2112. The plurality of battery cells 21 in the battery cell group 20 include a first battery cell 21a, at least one second battery cell 21b, and a third battery cell 21c arranged in sequence. A sub-inlet 22111 for the heat exchange medium to flow in and a sub-outlet 22112 for the heat exchange medium to flow out are provided on one side of the first battery cell 21a away from the second battery cell 21b along the first direction X, and two interfaces 2112 are provided on the other side. Two interfaces 2112 are provided on both sides of the second battery cell 21b along the first direction X. Two interfaces 2112 are provided on one side of the third battery cell 21c close to the second battery cell 21b, and two flow channel connection ports 2221 are provided on the other side. The flow channel connection ports 2221 are openings at the ends of the sub-channel 2211, and the two flow channel connection ports 2221 are connected.

[0184] In the battery device 100 provided in the above embodiment, the sub-channel 2211 is directly arranged in the wall body of the outer shell 211, which can solve the problem of the weight increase of the battery device 100 caused by the thermal management component, and is beneficial to the lightweight of the battery device 100.

[0185] An embodiment of the second aspect of the present application provides an electrical device, including the battery device 100 provided in the first aspect, and the battery device 100 is used to provide electric energy.

[0186] The electrical device can be any of the foregoing devices or systems applying the battery device 100.

[0187] The battery device 100 provided in the embodiment of the present application is lighter, which is beneficial to the lightweight of the electrical device.

[0188] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A battery device, characterized in that, The battery device includes: At least one battery cell group, the battery cell group including a plurality of battery cells arranged in sequence along a first direction, the battery cell including a housing and an electrode assembly disposed within the housing; A sub-channel is provided within the wall of the housing, and the sub-channels within a plurality of the battery cells are sequentially connected along the first direction to form a heat exchange channel for allowing a heat exchange medium to flow therethrough; an interface communicating with the sub-channel is provided on the housing, and the interfaces of two adjacent battery cells are sealingly connected.

2. The battery device according to claim 1, wherein The wall of the housing includes a first wall, the sub-channel is provided within the first wall, and the interface is provided on the first wall and extends along the first direction.

3. The battery device according to claim 2, wherein The interface protrudes from the first wall, and the interfaces of two adjacent battery cells are fitted or snap-connected.

4. The battery device according to claim 3, characterized in that, Among two fitted interfaces, an outer surface of one interface is provided with an annular first groove, and an inner surface of the other interface is provided with an annular second groove, and the first groove and the second groove are fitted with each other to connect the two interfaces.

5. The battery device according to claim 3, characterized in that, A waterproof sealing structure is provided on the connected interfaces.

6. The battery device according to claim 2, wherein, The housing includes two of the first walls, and the two first walls are disposed opposite to each other along a second direction, and the second direction intersects the first direction; The first wall is the side wall with the largest area in the housing, the sub-channels are provided within both of the two first walls, and the sub-channels on both sides of the battery cell group along the second direction are respectively connected and respectively form the heat exchange channel.

7. The battery device according to claim 6, characterized in that, The two heat exchange channels on both sides of the battery cell group along the second direction are sequentially connected to form a branch channel.

8. The battery device according to claim 7, wherein The plurality of battery cells in the battery cell group include a first battery cell, at least one second battery cell, and a third battery cell arranged in sequence along the first direction; A sub-inlet for allowing a heat exchange medium to flow in and a sub-outlet for allowing the heat exchange medium to flow out are provided on a side of the first battery cell away from the second battery cell, and two interfaces are provided on the other side; Two interfaces are provided on both sides of the second battery cell along the first direction; Two interfaces are provided on a side of the third battery cell close to the second battery cell, and two flow channel connection ports are provided on the other side, the flow channel connection ports being openings at the ends of the sub-channels, and the two flow channel connection ports are connected.

9. The battery device according to claim 8, wherein, The battery cell further includes a second wall connected between the two first walls, and a communication channel is provided within the second wall of the third battery cell, and the communication channel connects the two flow channel connection ports.

10. The battery device according to claim 8, characterized in that, The battery device further includes an inlet pipe and a return pipe, the sub-inlet is connected and communicated with the inlet pipe, and the sub-outlet is connected and communicated with the return pipe.

11. The battery device according to claim 10, characterized in that, The number of the battery cell groups is multiple, and the multiple battery cell groups are arranged in sequence along the second direction; The branch channels of the multiple battery cell groups are arranged in parallel, and each branch channel is respectively connected to the inlet pipe and the return pipe.

12. The battery device according to claim 11, wherein, A plurality of main inlet ports are provided on the inlet pipe at intervals along the second direction, and the plurality of main inlet ports are in one-to-one correspondence and communication with the sub-inlet ports of the plurality of branch channels; A plurality of main return ports are provided on the return pipe at intervals along the second direction, and the plurality of main return ports are in one-to-one correspondence and communication with the sub-return ports of the plurality of branch channels.

13. The battery device according to claim 12, wherein A plurality of first flow dividing plates are further provided in the inlet pipe, each first flow dividing plate is disposed at the main inlet port, one end of the first flow dividing plate is disposed on one side of the main inlet port, and the other end of the first flow dividing plate extends toward the inside of the inlet pipe and forms a gap with the inner wall of the inlet pipe.

14. The battery device according to claim 12, characterized in that, The main inlet port and the sub-inlet port are fitted and connected or snap-connected; and / or, The main return port and the sub-return port are fitted and connected or snap-connected.

15. The battery device according to any one of claims 1-14, characterized in that, The sub-channel includes a plurality of straight sections and bent sections, the plurality of straight sections are arranged at intervals along the first direction, and the bent section is connected between two adjacent straight sections.

16. The battery device according to any one of claims 1 to 14, characterized in that, The housing includes a housing formed by 3D printing.

17. An electrical device, characterized in that, Comprising the battery device according to any one of claims 1 to 16, the battery device being used for providing electric energy.

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