Battery device and electric device

Abstract

The application provides a battery device and a power utilization device. The battery device comprises a battery cell assembly, a first box body and a second box body. The battery cell assembly comprises a plurality of battery cells arranged in a stack. The first box body comprises a bottom plate, a first side wall plate and a second side wall plate. The bottom plate has a bearing surface. The first side wall plate and the second side wall plate are arranged oppositely. The first side wall plate and the second side wall plate are connected to the bearing surface. The first side wall plate and the second side wall plate are connected to the second box body. The second box body comprises a top plate and two third side wall plates. The top plate and the bottom plate are arranged oppositely along a second direction. The two third side wall plates are arranged oppositely along a third direction. One end of the third side wall plate in the second direction is connected to the top plate. The inside of at least two of the bottom plate, the top plate and the two third side wall plates is provided with a flow channel. The technical scheme provided by the application can improve the reliability of the battery device.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In the development of battery technology, how to improve the reliability of battery devices is a technical problem that urgently needs to be solved. Summary of the Invention

[0004] This application provides a battery device and an electrical device that can improve the reliability of the battery device.

[0005] This application is achieved through the following technical solution:

[0006] In a first aspect, this application provides a battery device, which includes a battery cell assembly, a first housing body, and a second housing body. The battery cell assembly includes a plurality of battery cells stacked along a first direction. Each battery cell has a first surface perpendicular to the first direction, and the first surface is the surface with the largest area of ​​the battery cell. The first housing body includes a base plate, a first side wall plate, and a second side wall plate. The base plate has a bearing surface on one side in a second direction, which supports the battery cells along the second direction. The first and second side wall plates are disposed opposite to each other along the first direction, and both the first and second side wall plates are connected to the bearing surface. The second housing body, together with the first housing body, defines an assembly space for accommodating the battery cell assembly. Both the first and second side wall plates are connected to the second housing body. The second housing body includes a top plate and two third side wall plates. The top plate and the bottom plate are disposed opposite to each other along the second direction, and the two third side wall plates are disposed opposite to each other along the third direction. One end of each third side wall plate in the second direction is connected to the top plate. The bottom plate, the top plate, and at least two of the two third sidewalls are provided with flow channels inside. The flow channels are used to contain heat exchange medium for thermally connecting with at least two sides of the battery cell assembly. The first direction, the second direction, and the third direction are perpendicular to each other.

[0007] The technical solution of this application embodiment, compared to setting heat exchange components on the wall panels of a single housing, achieves heat exchange for multiple battery cells by setting flow channels inside at least two of the bottom plate, top plate, and two third side wall panels. This improves the heat exchange efficiency of the battery cells, reduces the risk of battery cell temperature affecting charge and discharge efficiency, and enhances the reliability of the battery device. Furthermore, compared to setting additional heat exchange components inside the housing, the flow channels formed inside the housing wall panels improve the space utilization of the housing, allowing it to accommodate more battery cells and thus increasing the energy density of the battery device.

[0008] In some embodiments, the flow channels are provided inside at least three of the bottom plate, the top plate, and the two second sidewall plates.

[0009] The technical solution of this application embodiment enables heat exchange for multiple battery cells by setting flow channels inside at least three of the bottom plate, top plate and two third side wall plates. This improves the heat exchange efficiency of the battery cells, reduces the risk of the temperature of the battery cells affecting the charging and discharging efficiency, and improves the reliability and energy density of the battery device.

[0010] In some embodiments, the flow channels are provided inside the bottom plate, the top plate, and the two second sidewall plates.

[0011] The technical solution of this application embodiment provides flow channels inside the bottom plate, top plate and two third side wall plates to achieve heat exchange for multiple battery cells. This is beneficial to improving the heat exchange efficiency of battery cells, reducing the risk that the temperature of battery cells will affect the charging and discharging efficiency, and improving the reliability and energy density of the battery device.

[0012] In some embodiments, the first box body further includes two fourth side wall panels, which are arranged opposite to each other along the third direction. The fourth side wall panels are connected to the bottom plate and protrude from the bearing surface. The fourth side wall panels are connected to the third side wall panel.

[0013] The technical solution of this application embodiment connects the first box body and the second box body by connecting the third side wall panel with the fourth side wall panel, which helps to improve the convenience of connecting the first box body and the second box body.

[0014] In some embodiments, along the second direction, the fourth sidewall protrudes from the bearing surface by a dimension less than one-quarter of the maximum dimension of the third sidewall.

[0015] The technical solution of this application embodiment, along the second direction, sets the size of the fourth sidewall panel protruding from the bearing surface to be less than one-quarter of the maximum size of the third sidewall panel. This makes the size of the fourth sidewall panel used for assembly and connection between the first box body and the second box body smaller, which is beneficial for optimizing the size of the first box body in the second direction and reducing the binding force of the first box body on the second box body. This reduces the assembly difficulty between the first box body and the target component, and also reduces the difficulty of assembling the battery cells onto the bearing plate, thereby reducing the assembly difficulty of the battery device. Simultaneously, since the first box body is used to support the battery cell assembly, it requires high structural strength and has a high cost. When the size of the box body in the second direction remains unchanged, the smaller size of the fourth sidewall panel helps to reduce the cost of the first box body.

[0016] In some embodiments, the base plate has a first flow channel formed inside for accommodating the heat exchange medium, and the base plate is configured to manage the temperature of at least two of the battery cells in the battery cell assembly.

[0017] The technical solution of this application embodiment achieves heat exchange between the base plate and the battery cell assembly by forming a first flow channel inside the base plate to accommodate the heat exchange medium, which helps to improve the reliability of the battery device.

[0018] In some embodiments, the first housing body further includes a first expansion beam connected to the bearing surface, and one end of the battery cell assembly in the first direction abuts against the first expansion beam.

[0019] The technical solution of this application embodiment, by setting the first expansion beam to abut against one end of the battery cell assembly in the first direction, is beneficial to resisting the expansion force of the battery cell.

[0020] In some embodiments, along the first direction, the first sidewall panel, the first expansion beam, the battery cell assembly, and the second sidewall panel are arranged sequentially. The base plate is provided with a first medium inlet and a first medium outlet communicating with the first flow channel, both located between the first expansion beam and the first sidewall panel.

[0021] The technical solution of this application embodiment sets the first medium inlet and the first medium outlet between the first expansion beam and the first side wall plate, which reduces the risk of interference between the first medium inlet and the first medium outlet and the battery cell assembly, and helps to improve the reliability of the battery device.

[0022] In some embodiments, the battery device further includes a first connector and a second connector, which are respectively disposed on the first side wall plate. The battery device also includes a first connecting pipe and a second connecting pipe, both of which are located between the first expansion beam and the first side wall plate. The first connecting pipe connects the first medium inlet and the first connector, and the second connecting pipe connects the first medium outlet and the second connector.

[0023] The technical solution of this application embodiment connects the first medium inlet and the first connector via a first connecting pipe, and the second connecting pipe connects the first medium outlet and the second connector, thereby realizing the circulation of the heat exchange medium in the first flow channel, which is beneficial for the bottom plate to manage the temperature of the battery cell assembly. At the same time, the first and second connecting pipes are located between the first expansion beam and the first side wall plate, reducing the risk of interference between the first and second connecting pipes and the battery cell assembly, and improving the reliability of the battery device.

[0024] In some embodiments, the first housing body further includes a second expansion beam, which is connected to the base plate and is disposed opposite to the first expansion beam along the first direction, and the two ends of the battery cell assembly abut against the first expansion beam and the second expansion beam, respectively.

[0025] The technical solution of this application embodiment, by setting the first expansion beam and the second expansion beam to abut against the two ends of the battery cell assembly in the first direction, is beneficial to resisting the expansion force of the battery cell.

[0026] In some embodiments, the number of battery cell assemblies is multiple, and the multiple battery cell assemblies are arranged along the third direction. The first housing body also includes a partition plate disposed between two adjacent battery cell assemblies, and in the first direction, the two ends of the partition plate are respectively connected to the first expansion beam and the second expansion beam.

[0027] The technical solution of this application embodiment reduces the risk of interference between adjacent battery cell modules by placing a separator between them. Simultaneously, the separator connects the first expansion beam and the second expansion beam, improving the reliability of the first and second expansion beams in resisting the expansion force of the battery cells.

[0028] In some embodiments, the partition plate has a second flow channel formed inside for accommodating the heat exchange medium, and the partition plate is configured to manage the temperature of at least two of the battery cells in the battery cell assembly.

[0029] The technical solution of this application embodiment achieves heat exchange between the separator and the battery cell assembly by forming a second flow channel inside the separator to accommodate the heat exchange medium, which helps to improve the reliability of the battery device.

[0030] In some embodiments, along the first direction, the base plate includes a first sub-base plate, a second sub-base plate, and a third sub-base plate arranged sequentially. The first sub-base plate is connected to the first expansion beam and the first sidewall plate. The bearing surface is disposed on the second sub-base plate, and the first flow channel is formed inside the second sub-base plate. The third sub-base plate is connected to the second expansion beam and the second sidewall plate. The partition plate is connected to the second sub-base plate.

[0031] The technical solution of this application embodiment connects the first sub-base plate to the first expansion beam and the first side wall plate, the third sub-base plate to the second expansion beam and the second side wall plate, and the second sub-base plate to the first sub-base plate and the third sub-base plate, which facilitates the connection of the first expansion beam, the first side wall plate, the second expansion beam and the second side wall plate to the base plate.

[0032] In some embodiments, the second sub-base plate includes a first portion, a second portion, and a third portion arranged along the second direction, the second portion being integrally formed with the partition plate, and the first portion and the third portion being connected through the second portion.

[0033] The technical solution of this application embodiment is that the second part is integrally formed with the partition plate, and the first part and the third part are connected through the second part, which facilitates the connection between the partition plate and the bottom plate.

[0034] In some embodiments, the first expansion beam is provided with a first through hole, which extends through the first expansion beam along the first direction, and the partition plate passes through the first through hole. The partition plate is provided with a second medium inlet and a second medium outlet communicating with the second flow channel, and both the second medium outlet and the second medium inlet are located between the first expansion beam and the first side wall plate.

[0035] The technical solution of this application embodiment, by providing a first through hole in the first expansion beam and having a partition plate pass through the first through hole, facilitates the connection between the partition plate and the first expansion beam, thereby improving the reliability of the connection between the partition plate and the first expansion beam. Simultaneously, the partition plate passing through the first through hole ensures that the second medium inlet and the second medium outlet are located on the side of the first expansion beam away from the battery cell assembly, which helps reduce the risk of interference between the second medium inlet and the second medium outlet and the battery cell assembly, thus improving the reliability of the battery device.

[0036] In some embodiments, a connecting block is provided at one end of the partition plate away from the first expansion beam, and a groove is provided on the side of the second expansion beam facing the first expansion beam. At least a portion of the connecting block is embedded in the groove to restrict the partition plate from detaching from the second expansion beam.

[0037] The technical solution of this application embodiment uses a connecting block of the partition plate disposed in the groove of the second expansion beam, which facilitates the connection between the partition plate and the second expansion beam and improves the reliability of the connection between the partition plate and the second expansion beam.

[0038] In some embodiments, the top plate has a third flow channel formed inside for accommodating the heat exchange medium, and the top plate is configured to manage the temperature of at least two of the battery cells in the battery cell assembly.

[0039] The technical solution of this application embodiment achieves heat exchange between the top plate and the battery cell assembly by forming a third flow channel inside the top plate to accommodate the heat exchange medium, which helps to improve the reliability of the battery device.

[0040] In some embodiments, the interior of the third sidewall is formed with a fourth flow channel for accommodating the heat exchange medium, and the third sidewall is configured to manage the temperature of at least two of the battery cells in the battery cell assembly.

[0041] The technical solution of this application embodiment achieves heat exchange between the third side wall plate and the battery cell assembly by forming a fourth flow channel inside the third side wall plate for accommodating the heat exchange medium, which helps to improve the reliability of the battery device.

[0042] In some embodiments, the third sidewall panel and the top panel are integrally formed.

[0043] The technical solution of this application embodiment is that the third side wall panel and the top plate are integrally formed, which facilitates the processing of the second box body.

[0044] In some embodiments, a third flow channel for containing the heat exchange medium is formed inside the top plate, the third flow channel and the fourth flow channel are interconnected, a third medium inlet communicating with the fourth flow channel is provided on one of the third sidewalls, and a third medium outlet communicating with the fourth flow channel is provided on the other third sidewall.

[0045] The technical solution of this application embodiment, by setting a third medium inlet on one third side wall and a third medium outlet on another third side wall, realizes the circulation of heat exchange medium in the third flow channel and the fourth flow channel, which is beneficial for the third side wall and the top plate to manage the temperature of the battery cell assembly.

[0046] In some embodiments, a battery cell assembly is disposed between the two third sidewalls, one third sidewall is thermally connected to the battery cell assembly on the third-direction-oriented side, and the other third sidewall is thermally connected to the battery cell assembly on the other side of the third-direction-oriented side.

[0047] The technical solution of this application embodiment is to conduct heat to the battery cell assembly on one side of the third-direction upward through a third side wall plate, and to conduct heat to the battery cell assembly on the other side of the third-direction upward through another third side wall plate. This can better manage the temperature of the battery cells, reduce the risk of the battery cell temperature affecting the charging and discharging efficiency, and help improve the reliability of the battery device.

[0048] In some embodiments, a plurality of battery cell assemblies are disposed between the two third sidewalls, and the plurality of battery cell assemblies are arranged along the third direction. The first housing body further includes a partition plate disposed between two adjacent battery cell assemblies, the partition plate having a second flow channel formed inside for accommodating the heat exchange medium, and the partition plate being configured to manage the temperature of at least two of the battery cells in the battery cell assembly.

[0049] The technical solution of this application embodiment, through the joint thermal connection of two third sidewalls and a partition plate with the battery cell assembly on both sides in the third direction, can better manage the temperature of the battery cell, reduce the risk of the battery cell temperature affecting the charging and discharging efficiency, and help improve the reliability of the battery device.

[0050] In some embodiments, the outer surface of the battery cell is covered with a thermally conductive element, the thermally conductive element including a first thermally conductive portion and a second thermally conductive portion connected to each other, the first thermally conductive portion being thermally connected to the first surface, and the second thermally conductive portion being thermally connected to at least one of the bottom plate, the top plate and the two third sidewall plates.

[0051] The technical solution of this application embodiment, by setting a heat-conducting component, makes the first heat-conducting part thermally connected to the first surface, and the second heat-conducting part thermally connected to at least one of the bottom plate, the top plate and the two third side wall plates. This allows the bottom plate, the top plate and the two third side wall plates to regulate the temperature of the first surface through the heat-conducting component, which can better manage the temperature of the battery cells, reduce the risk of the battery cell temperature affecting the charging and discharging efficiency, and help improve the reliability of the battery device.

[0052] In some embodiments, the battery cell includes electrode terminals located on the side of the battery cell facing the top plate. The second heat-conducting portion is thermally connected to both the bottom plate and the two third sidewalls.

[0053] The technical solution of this application embodiment, through the thermally conductive connection between the second heat-conducting part and the base plate and the two third side wall plates, can better manage the temperature of the battery cells, reduce the risk of the battery cell temperature affecting the charging and discharging efficiency, and at the same time reduce the risk of interference between the heat-conducting part and the electrode terminals, which is conducive to improving the reliability of the battery device.

[0054] In some embodiments, the material of the thermal conductive element includes at least one of graphene, carbon nanotubes, and silicene.

[0055] The technical solutions of this application embodiment have good thermal conductivity of graphene, carbon nanotubes and silicene. By setting the material of the heat-conducting component to include at least one of the above materials, the temperature of the battery cell can be better managed, reducing the risk of the battery cell temperature affecting the charging and discharging efficiency, and improving the reliability of the battery device.

[0056] In some embodiments, in the second direction, the battery cell has a second surface facing the top plate, and the battery cell includes electrode terminals disposed on the second surface. A third flow channel for accommodating the heat exchange medium is formed inside the top plate, and the top plate is thermally connected to the second surface.

[0057] The technical solution of this application embodiment, through the thermally conductive connection between the top plate and the second surface, can better manage the temperature of the battery cells, reduce the risk of the battery cell temperature affecting the charging and discharging efficiency, and help improve the reliability of the battery device.

[0058] In some embodiments, in the second direction, the battery cell has a second surface facing the top plate, and the battery cell includes electrode terminals disposed on the second surface. The battery cell assembly further includes a busbar that electrically connects the electrode terminals of a plurality of battery cells, and the top plate has a third flow channel formed therein for accommodating the heat exchange medium, and the top plate is thermally connected to the busbar.

[0059] The technical solution of this application embodiment, through the thermal connection between the top plate and the busbar component, can better manage the temperature of the battery cells, reduce the risk of the battery cell temperature affecting the charging and discharging efficiency, and help improve the reliability of the battery device.

[0060] In some embodiments, in the third direction, the battery cell has a third surface facing the third sidewall, the battery cell including electrode terminals disposed on the third surface. A fourth flow channel for accommodating the heat exchange medium is formed inside the third sidewall, and the third sidewall is thermally connected to the third surface.

[0061] The technical solution of this application embodiment, through the thermally conductive connection between the third sidewall plate and the third surface, can better manage the temperature of the battery cells, reduce the risk of the battery cell temperature affecting the charging and discharging efficiency, and help improve the reliability of the battery device.

[0062] Secondly, this application also provides an electrical device, including a battery device according to any embodiment of the first aspect, the battery device being used to provide electrical energy to the electrical device.

[0063] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0064] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0065] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0066] Figure 2 This is an exploded view of the structure of a battery device provided in some embodiments of this application;

[0067] Figure 3 This is an exploded view of the structure of a battery cell provided in some embodiments of this application;

[0068] Figure 4 This is a schematic diagram of the internal structure of a battery device provided in some embodiments of this application;

[0069] Figure 5 Schematic diagrams of the structure of the first expansion beam and the first sidewall plate provided in some embodiments of this application;

[0070] Figure 6 This is an exploded view of the structure of a battery device provided in other embodiments of this application;

[0071] Figure 7 This is a schematic diagram of the internal structure of a battery device provided in other embodiments of this application;

[0072] Figure 8 This is a schematic diagram of the structure of the base plate and the partition plate provided in some embodiments of this application;

[0073] Figure 9 for Figure 8 Enlarged view of point B in the middle;

[0074] Figure 10 for Figure 8 Enlarged view of point C in the middle;

[0075] Figure 11 A schematic diagram of a battery device from another perspective, provided for some embodiments of this application;

[0076] Figure 12 This is a schematic diagram illustrating the assembly of a heat-conducting component with a battery cell according to some embodiments of this application;

[0077] Figure 13 This is a schematic diagram of the structure of a heat-conducting component provided in some embodiments of this application;

[0078] Figure 14 This is an exploded view of the structure of a battery device provided in some embodiments of this application.

[0079] Icons: 1-Battery assembly; 10-Battery cell assembly; 11-Battery cell; 111-First surface; 112-Second surface; 113-Third surface; 114-Electrode terminal; 115-Housing shell; 1151-End cap; 1152-Housing shell; 116-Electrode assembly; 12-Busting component; 20-First housing body; 21-Base plate; 211-Bearing surface; 212-First medium inlet; 213-First medium outlet; 214-First sub-base plate; 215-Second sub-base plate; 2151-First section; 2152-Second section; 2153-Third section; 216-Third sub-base plate; 22-First side wall plate; 23-Second side wall plate; 24-Fourth side wall plate; 25-First expansion beam; 251-First through hole ; 26-Second expansion beam; 261-Groove; 27-Separator plate; 271-Second medium inlet; 272-Second medium outlet; 273-Connecting block; 30-Second box body; 31-Top plate; 32-Third side wall plate; 321-Third medium inlet; 322-Third medium outlet; 40-Assembly space; 50-Flow channel; 51-First flow channel; 52-Second flow channel; 53-Third flow channel; 54-Fourth flow channel; 60-First connector; 61-Second connector; 62-First connecting pipe; 63-Second connecting pipe; 70-Heat-conducting component; 71-First heat-conducting part; 72-Second heat-conducting part; 80-Box body; 100-Vehicle; 110-Controller; 120-Motor; X-First direction; Z-Second direction; Y-Third direction. Detailed Implementation

[0080] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0081] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application 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 description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0082] In this application, the reference to "embodiment" means that a specific 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 mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0083] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0084] 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, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0085] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0086] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0087] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0088] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0089] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0090] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0091] As an example, the enclosure may include a first enclosure body and a second enclosure body. The first enclosure body and the second enclosure body are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed.

[0092] As an example, the enclosure may include a top plate, a frame, and a bottom plate. The top plate and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0093] As an example, the box body can be part of the vehicle's chassis structure. For instance, the box body's roof plate can be at least part of the vehicle's floor, or the box body's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0094] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0095] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0096] The battery cell may be, but is not limited to, lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc.

[0097] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0098] In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0099] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0100] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0101] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used.

[0102] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0103] As an example, the negative electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, or made of carbon, nickel, or titanium, etc.

[0104] In some embodiments, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0105] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in batteries. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0106] In some embodiments, the separator is a diaphragm. This application does not impose any particular limitation on the type of diaphragm; any known porous diaphragm with good chemical and mechanical stability can be selected.

[0107] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0108] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0109] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0110] In some implementations, the electrode assembly is a stacked structure.

[0111] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0112] In some embodiments, the housing includes an end cap and a casing, the casing having an opening, and the end cap closing the opening to form a sealed space for accommodating substances such as electrode assemblies and electrolytes. The casing may have one or more openings. The end cap may also be provided one or more times.

[0113] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab or indirectly connected to the tab via an adapter. The electrode terminal can be located on the end cap or on the housing.

[0114] In some implementations, an explosion-proof valve is provided on the housing. The explosion-proof valve is used to release the internal pressure of the battery cells.

[0115] In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a sealed structure, it protects the electrode assembly and prevents leaks such as electrolyte leakage. When the housing is a non-sealed structure, it protects the electrode assembly, and a sealing bag may be included between the housing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag can be a bag-shaped insulating material or an aluminum-plastic film.

[0116] As an example, a battery cell can be a prismatic battery cell or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0117] Currently, judging from market trends, battery devices are widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in power tools, drones, energy storage equipment, and many other fields. As the application areas for batteries continue to expand, the market demand is also constantly increasing.

[0118] The development of battery technology must take into account multiple design factors, such as energy density, cycle life, discharge capacity, charge-discharge rate and other performance parameters. In addition, the reliability of battery devices is also a key consideration as environmental and / or internal battery conditions change.

[0119] Multiple battery cells are arranged in one direction to form a battery cell assembly. At least one battery cell assembly is placed inside a housing to form a battery device. The charging and discharging efficiency of a battery cell is temperature-dependent. To meet the temperature requirements of the battery cells, a heat exchange plate is usually installed on the bottom plate of the housing, and the heat exchange plate exchanges heat with the battery cell assembly.

[0120] However, relying solely on heat exchange plates mounted on the base plate for heat exchange with individual battery cells results in low heat exchange efficiency, impacting the reliability of the battery system. Furthermore, placing heat exchange plates within the housing occupies internal space, affecting the space utilization of the battery system and consequently its energy density.

[0121] Based on the above considerations, in order to solve the problems of poor reliability and low energy density of battery devices, this application provides a battery device. The battery device includes a battery cell assembly, a first housing body, and a second housing body. The battery cell assembly includes multiple battery cells stacked along a first direction. Each battery cell has a first surface perpendicular to the first direction, which is the surface with the largest area of ​​the battery cell. The first housing body includes a bottom plate, a first side wall plate, and a second side wall plate. The bottom plate has a bearing surface on one side in a second direction, which supports the battery cells along the second direction. The first and second side wall plates are arranged opposite to each other along the first direction, and both are connected to the bearing surface. The second housing body and the first housing body together define an assembly space for accommodating the battery cell assembly. Both the first and second side wall plates are connected to the second housing body. The second housing body includes a top plate and two third side wall plates. The top plate and the bottom plate are arranged opposite to each other along the second direction, and the two third side wall plates are arranged opposite to each other along a third direction. One end of each third side wall plate in the second direction is connected to the top plate. The bottom plate, the top plate, and the two third side wall plates are provided with flow channels inside. The flow channels are used to contain heat exchange medium so that the box body is thermally connected to at least two sides of the battery cell assembly, and the first direction, the second direction, and the third direction are perpendicular to each other.

[0122] Compared to installing heat exchange components on the walls of a single housing, heat exchange can be achieved for multiple battery cells by incorporating flow channels within at least two of the bottom plate, top plate, and two third side walls. This improves the heat exchange efficiency of individual battery cells, reduces the risk of individual cell temperature affecting charge and discharge efficiency, and enhances the reliability of the battery pack. Furthermore, compared to installing additional heat exchange components within the housing, the flow channels formed within the housing walls improve space utilization, allowing the housing to accommodate more battery cells and thus increasing the energy density of the battery pack.

[0123] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery devices.

[0124] Electrical devices can include mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft, such as airplanes, rockets, space shuttles, and spacecraft.

[0125] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0126] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle 100 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 1 is installed inside the vehicle 100, and the battery device 1 can be located at the bottom, front, or rear of the vehicle 100. The battery device 1 can be used to power the vehicle 100; for example, the battery device 1 can serve as the operating power source for the vehicle 100's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 100.

[0127] The vehicle 100 may also include a controller 110 and a motor 120. The controller 110 is used to control the battery device 1 to supply power to the motor 120, for example, for the power needs of the vehicle 100 during startup, navigation and driving.

[0128] In some embodiments of this application, the battery device 1 can not only serve as the operating power source of the vehicle 100, but also as the driving power source of the vehicle 100, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 100.

[0129] The battery device includes battery cell modules and a power management system. The battery management system is connected to the battery cell modules and is used to manage the charging and discharging of the battery cell modules.

[0130] Please refer to Figure 2 , Figure 2 This is an exploded view of the structure of a battery device provided in some embodiments of this application. The battery device 1 may include a housing 80 and a battery cell 11, with the battery cell 11 housed within the housing 80.

[0131] The housing 80 provides a space for accommodating the battery cell 11, and the housing 80 can adopt various structures. In some embodiments, the housing 80 may include a first housing body 20 and a second housing body 30, which overlap each other, and together define an assembly space 40 for accommodating the battery cell 11. The second housing body 30 covers the first housing body 20, so that the first housing body 20 and the second housing body 30 together define the assembly space 40.

[0132] In the battery device 1, there can be multiple battery cells 11, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 11 are connected in both series and parallel configurations. Multiple battery cells 11 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 11 is housed within the housing 80. Alternatively, the battery device 1 can also consist of multiple battery cells 11 first connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 80. The battery device 1 may also include other structures; for example, it may include a busbar component 12 for realizing the electrical connection between the multiple battery cells 11.

[0133] Please refer to Figure 3 , Figure 3 This is an exploded view of the structure of a battery cell provided in some embodiments of this application. For example... Figure 3 As shown, the battery cell 11 includes a housing 115, an electrode assembly 116, and electrode terminals 114. The housing 115 includes a casing 1152 and an end cap 1151. The casing 1152 has an opening, and the end cap 1151 closes the opening to isolate the internal environment of the battery cell 11 from the external environment.

[0134] The housing 1152 is an assembly used to cooperate with the end cap 1151 to form the internal environment of the battery cell 11, wherein the formed internal environment can accommodate the electrode assembly 116, electrolyte, and other components. The housing 1152 and the end cap 1151 can be independent components. The housing 1152 can have various shapes and sizes. Specifically, the shape of the housing 1152 can be determined according to the specific shape and size of the electrode assembly 116. The housing 1152 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0135] End cap 1151 refers to a component that covers the opening of housing 1152 to isolate the internal environment of battery cell 11 from the external environment. The shape of end cap 1151 can be adapted to the shape of housing 1152 to fit it. Optionally, end cap 1151 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 1151 is not easily deformed under pressure and impact, giving battery cell 11 higher structural strength and improved reliability. Functional components such as electrode terminals can be provided on end cap 1151. Electrode terminals can be used for electrical connection with electrode assembly 116 to output or input electrical energy to battery cell 11. The material of end cap 1151 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating structure may be provided on the inner side of the end cap 1151. The insulating structure can be used to isolate the electrical connection components within the housing 1152 from the end cap 1151 to reduce the risk of short circuits. For example, the insulating structure may be made of plastic, rubber, etc.

[0136] Please refer to Figure 2 and refer to Figure 4 , Figure 4 This is a schematic diagram of the internal structure of a battery device provided in some embodiments of this application. Embodiments of this application provide a battery device 1, which includes a battery cell assembly 10, a first housing body 20, and a second housing body 30. The battery cell assembly 10 includes a plurality of battery cells 11 stacked along a first direction X. Each battery cell 11 has a first surface 111 perpendicular to the first direction X, and the first surface 111 is the surface with the largest area of ​​the battery cell 11. The first housing body 20 includes a base plate 21, a first side wall plate 22, and a second side wall plate 23. The base plate 21 has a bearing surface 211 on one side in the second direction Z, which supports the battery cells 11 along the second direction Z. The first side wall plate 22 and the second side wall plate 23 are arranged opposite each other along the first direction X, and both the first side wall plate 22 and the second side wall plate 23 are connected to the bearing surface 211. The second housing body 30 and the first housing body 20 together define an assembly space 40 for accommodating the battery cell assembly 10. The first side wall panel 22 and the second side wall panel 23 are both connected to the second housing body 30. The second housing body 30 includes a top plate 31 and two third side wall panels 32. The top plate 31 and the bottom plate 21 are arranged opposite each other along the second direction Z, and the two third side wall panels 32 are arranged opposite each other along the third direction Y. One end of the third side wall panel 32 in the second direction Z is connected to the top plate 31. At least two of the bottom plate 21, the top plate 31, and the two third side wall panels 32 have flow channels 50 inside. The flow channels 50 are used to accommodate heat exchange medium, so that the housing 80 is thermally connected to at least two sides of the battery cell assembly 10. The first direction X, the second direction Z, and the third direction Y are perpendicular to each other.

[0137] In some embodiments, the first direction can be represented by the direction shown by the letter X in the figure, the second direction can be represented by the direction shown by the letter Z in the figure, and the third direction can be represented by the direction shown by the letter Y in the figure.

[0138] In some embodiments, the first direction X may be parallel to the length direction of the housing 80, the second direction Z may be parallel to the height direction of the housing 80, and the third direction Y may be parallel to the width direction of the housing 80.

[0139] In some embodiments, the first direction X, the second direction Z, and the third direction Y can be perpendicular to each other.

[0140] In some embodiments, the battery cell 11 can be rectangular, and the battery cell 11 can have two first surfaces 111, two second surfaces 112, and two third surfaces 113. The two first surfaces 111 are arranged opposite each other along a first direction X, the two second surfaces 112 are arranged opposite each other along a second direction Z, and the two third surfaces 113 are arranged opposite each other along a third direction Y. The surface area of ​​the first surface 111 is larger than the surface area of ​​the second surface 112, and the surface area of ​​the first surface 111 is larger than the surface area of ​​the third surface 113.

[0141] In some embodiments, at least two of the bottom plate 21, top plate 31 and two third side wall plates 32 are provided with flow channels 50 for containing heat exchange medium so that the housing 80 is thermally connected to at least two sides of the battery cell assembly 10.

[0142] Taking the flow channel 50 inside the base plate 21 as an example, the housing 80 can be thermally connected to the surface of the battery cell assembly 10 facing the base plate 21 in the second direction Z.

[0143] Taking the top plate 31 with a flow channel 50 as an example, the housing 80 can be thermally connected to the surface of the battery cell assembly 10 facing the top plate 31 in the second direction Z.

[0144] Taking the internal flow channel 50 of the third side wall panel 32 as an example, the housing 80 can be thermally connected to the battery cell assembly 10 in the third direction Y facing the surface of the third side wall panel 32.

[0145] In summary, the housing 80 is not thermally connected to the surface of the battery cell 11 in the first direction X.

[0146] In some embodiments, the bottom plate 21, top plate 31 and two third side wall plates 32 can form the flow channel 50 by integral molding, or by setting a separator between two spaced plates and then sealing the two plates to form the flow channel 50.

[0147] In some embodiments, the bottom plate 21, top plate 31, and two third sidewall plates 32 may form the flow channel 50 in the same or different ways.

[0148] In some embodiments, the bottom plate 21 and the top plate 31 may be thermally connected to the battery cell assembly 10.

[0149] In some embodiments, the base plate 21 and a third sidewall plate 32 may be thermally connected to the battery cell assembly 10.

[0150] In some embodiments, a third sidewall panel 32 and a top panel 31 may be thermally connected to the battery cell assembly 10.

[0151] In some embodiments, the two third sidewall panels 32 may be thermally connected to the battery cell assembly 10.

[0152] In some embodiments, the bottom plate 21, the top plate 31, and a third sidewall plate 32 may be thermally connected to the battery cell assembly 10.

[0153] In some embodiments, the base plate 21 and the two third sidewalls 32 may be thermally connected to the battery cell assembly 10.

[0154] In some embodiments, the top plate 31 and the two third sidewalls 32 may be thermally connected to the battery cell assembly 10.

[0155] In some embodiments, the bottom plate 21, the top plate 31, and the two third sidewalls 32 may be thermally connected to the battery cell assembly 10.

[0156] In some embodiments, the heat exchange medium may be a cooling medium, such as a coolant, used to cool the battery cell assembly 10.

[0157] In some embodiments, the heat exchange medium can be a medium with a higher temperature, used to heat up the battery cell assembly 10.

[0158] In some embodiments, when one of the bottom plate 21, the top plate 31, and the two third sidewalls 32 is thermally connected to one side of the battery cell assembly 10, it can be thermally connected to at least two battery cells 11 simultaneously.

[0159] For example, when the base plate 21 is thermally connected to the first side of the battery cell assembly 10, the base plate 21 can simultaneously be thermally connected to the surfaces of multiple battery cells 11 facing the base plate 21 in the second direction Z.

[0160] In some embodiments, thermally conductive adhesive may be provided between the bottom plate 21, the top plate 31, and the two third sidewalls 32 and the battery cell assembly 10 to improve the thermal conductivity between the bottom plate 21, the top plate 31, and the two third sidewalls 32 and the battery cell assembly 10.

[0161] In some embodiments, the first box body 20 and the second box body 30 can be made of various materials. The first box body 20 and the second box body 30 can be made of non-metallic materials, such as polymer composite materials. Of course, the first box body 20 and the second box body 30 can also be made of metallic materials, such as aluminum, aluminum alloy, or steel. Similarly, the materials of the first box body 20 and the second box body 30 can be the same or different.

[0162] In some embodiments, the housing 80 includes a first housing body 20 and a second housing body 30. The bottom plate 21 of the first housing body 20 is used to support the battery cell assembly 10. That is, the first housing body 20 can be the lower part of the housing 80, and the second housing body 30 can be the upper part of the housing 80.

[0163] In some embodiments, the first housing body 20 includes a base plate 21, which has a bearing surface 211 on one side in the second direction Z. The thickness direction of the base plate 21 can be parallel to the second direction Z, that is, the thickness direction of the base plate 21 can be parallel to the direction of gravity. The bearing surface 211 can be the surface of the base plate 21 facing the battery cell assembly 10.

[0164] In some embodiments, the battery cell assembly 10 is disposed at the bottom, and along the second direction Z, the bottom plate 21 is disposed at the bottom of the battery cell assembly 10, so that the bottom can support the battery cell assembly 10.

[0165] In some embodiments, the first box body 20 includes a first side wall panel 22 and a second side wall panel 23, and a bottom plate 21 is connected to the first side wall panel 22 and the second side wall panel 23. The first side wall panel 22 and the second side wall panel 23 can be arranged opposite to each other along a first direction X, wherein the first side wall panel 22 and the second side wall panel 23 can be disposed at both ends of the bottom plate 21 in the first direction X, and the first side wall panel 22 and the second side wall panel 23 can be two opposite side beams of the box body 80 in the first direction X, that is, the first side wall panel 22 and the second side wall panel 23 can be the two outermost components of the box body 80 in the first direction X.

[0166] In some embodiments, the first sidewall panel 22 and the second sidewall panel 23 may extend along the second direction Z. In the second direction Z, one end of the first sidewall panel 22 and one end of the second sidewall panel 23 are connected to the bottom plate 21, and the other end is connected to the top plate 31.

[0167] In some embodiments, the top plate 31 is connected to two third side wall panels 32. The two third side wall panels 32 can be arranged opposite each other along the third direction Y, wherein the two third side wall panels 32 can be disposed at both ends of the top plate 31 in the third direction Y, and the two third side wall panels 32 can be two opposite side beams of the box body 80 in the third direction Y, that is, the two third side wall panels 32 can be the two outermost components of the box body 80 in the third direction Y.

[0168] In some embodiments, the third sidewall panel 32 may extend along the second direction Z. In the second direction Z, one end of the third sidewall panel 32 is connected to the top plate 31, and the other end is connected to the first box body 20, such as to the bottom plate 21 of the first box body 20, or to other sidewall panels of the first box body 20.

[0169] The two third side wall panels 32 of the second box body 30 are respectively connected to the two ends of the top plate 31 in the third direction Y, so that the cross section of the second box body 30 perpendicular to the first direction X is a "U" shaped structure, and the two ends of the second box body 30 in the first direction X are open structures.

[0170] Correspondingly, the first side wall plate 22 and the second side wall plate 23, which are arranged opposite each other in the first direction X, are used to block the two ends of the second box body 30 in the first direction X. That is, the first side wall plate 22, which is connected to the side of the bottom plate 21 facing the top plate 31, is connected to the top plate 31 and also to the two third side wall plates 32. The second side wall plate 23, which is connected to the side of the bottom plate 21 facing the top plate 31, is connected to the top plate 31 and also to the two third side wall plates 32, so that the cross section of the first box body 20 perpendicular to the third direction Y is also U-shaped.

[0171] The technical solution of this application embodiment, compared to setting heat exchange components on the wall panels of a single housing 80, achieves heat exchange for multiple battery cells 11 by setting flow channels 50 inside at least two of the bottom plate 21, top plate 31, and two third side wall panels 32. This improves the heat exchange efficiency of the battery cells 11, reduces the risk of the temperature of the battery cells 11 affecting the charging and discharging efficiency, and improves the reliability of the battery device 1. Furthermore, compared to setting additional heat exchange components inside the housing 80, the flow channels 50 are formed inside the wall panels of the housing 80, which improves the space utilization of the housing 80, allowing the housing 80 to accommodate more battery cells 11 and thus increasing the energy density of the battery device 1.

[0172] Please refer to Figure 2 and Figure 4 In some embodiments, at least three of the bottom plate 21, top plate 31 and two second side wall plates 23 are provided with flow channels 50 inside.

[0173] In some embodiments, the bottom plate 21, the top plate 31, and a third sidewall plate 32 may be thermally connected to the battery cell assembly 10.

[0174] In some embodiments, the base plate 21 and the two third sidewalls 32 may be thermally connected to the battery cell assembly 10.

[0175] In some embodiments, the top plate 31 and the two third sidewalls 32 may be thermally connected to the battery cell assembly 10.

[0176] The technical solution of this application embodiment provides a flow channel 50 inside at least three of the bottom plate 21, top plate 31 and two third side wall plates 32 to achieve heat exchange for multiple battery cells 11. This is beneficial to improve the heat exchange efficiency of the battery cells 11, reduce the risk of the temperature of the battery cells 11 affecting the charging and discharging efficiency, and improve the reliability and energy density of the battery device 1.

[0177] Please refer to Figure 2 and Figure 4 In some embodiments, flow channels 50 are provided inside the bottom plate 21, the top plate 31, and the two second side wall plates 23.

[0178] The technical solution of this application embodiment provides flow channels 50 inside the bottom plate 21, top plate 31 and two third side wall plates 32 to achieve heat exchange for multiple battery cells 11, which helps to improve the heat exchange efficiency of the battery cells 11, reduce the risk of the temperature of the battery cells 11 affecting the charging and discharging efficiency, and improve the reliability and energy density of the battery device 1.

[0179] Please refer to Figure 2 In some embodiments, the first box body 20 further includes two fourth side wall panels 24, which are arranged opposite each other along the third direction Y. The fourth side wall panels 24 are connected to the bottom plate 21 and protrude from the bearing surface 211. The fourth side wall panels 24 are connected to the third side wall panel 32.

[0180] In some embodiments, two fourth sidewall panels 24 are disposed opposite each other along a third direction Y. In the second direction Z, one end of the fourth sidewall panel 24 is connected to the base plate 21, and the other end is connected to the third sidewall panel 32. Specifically, one fourth sidewall panel 24 is connected to one third sidewall panel 32, and the other fourth sidewall panel 24 is connected to the other third sidewall panel 32.

[0181] In some embodiments, the fourth sidewall panel 24 is connected to the base plate 21 and protrudes from the bearing surface 211. That is, the fourth sidewall panel 24 of the first box body 20 is connected to the base plate 21 and extends beyond the bearing surface 211 of the base plate 21 in the second direction Z along the direction from the base plate 21 to the battery cell assembly 10.

[0182] In some embodiments, with the second direction Z as the projection direction, the orthographic projection of the fourth sidewall panel 24 can overlap with the orthographic projection of the third sidewall panel 32.

[0183] In some embodiments, with the second direction Z as the projection direction, the orthographic projection of the fourth side wall panel 24 can completely overlap with the orthographic projection of the third side wall panel 32.

[0184] In some embodiments, the two fourth sidewall panels 24 can be arranged opposite each other along the third direction Y, wherein the two fourth sidewall panels 24 can be arranged at both ends of the bottom plate 21 in the third direction Y, and the two fourth sidewall panels 24 can be two side beams opposite each other of the box 80 in the third direction Y, that is, the two fourth sidewall panels 24 can be the two outermost components of the box 80 in the third direction Y.

[0185] In some embodiments, the fourth sidewall panel 24 and the bottom plate 21 can be a separate structure, with one end of the bottom plate 21 in the third direction Y connected to one fourth sidewall panel 24 and the other end of the bottom plate 21 in the third direction Y connected to another fourth sidewall panel 24, and the fourth sidewall panel 24 protruding along the second direction Z from the bearing surface 211 of the bottom plate 21 facing the assembly space 40.

[0186] The technical solution of this application embodiment connects the first box body 20 and the second box body 30 by connecting the third side wall panel 32 with the fourth side wall panel 24, which helps to improve the convenience of connecting the first box body 20 and the second box body 30.

[0187] Please refer to Figure 2 In some embodiments, along the second direction Z, the fourth sidewall 24 protrudes from the bearing surface 211 by a dimension less than one-quarter of the maximum dimension of the third sidewall 32.

[0188] It should be noted that among the multiple side wall panels of the first box body 20, the side wall panel whose size protruding from the bearing surface 211 is less than one-quarter of the maximum size of the third side wall panel 32 is the fourth side wall panel 24. The first box body 20 may include other side wall panels, and the size of the other side wall panels protruding from the bearing surface 211 may be greater than one-quarter of the maximum size of the third side wall panel 32.

[0189] The technical solution of this application embodiment, along the second direction Z, sets the size of the fourth sidewall panel 24 protruding from the bearing surface 211 to be less than one-quarter of the maximum size of the third sidewall panel 32. This makes the size of the fourth sidewall panel 24, which is used for assembly and connection between the first box body 20 and the second box body 30, smaller. This is beneficial for optimizing the size of the first box body 20 in the second direction Z and can reduce the binding force of the first box body 20 on the second box body 30. This reduces the assembly difficulty between the first box body 20 and the target part, and also reduces the difficulty of assembling the battery cell 11 onto the bearing plate, thereby reducing the assembly difficulty of the battery device 1. At the same time, since the first box body 20 is used to support the battery cell assembly 10, it requires high structural strength and has a high cost. When the size of the box body 80 in the second direction Z remains unchanged, the smaller size of the fourth sidewall panel 24 helps to reduce the cost of the first box body 20.

[0190] Please refer to Figure 2 and Figure 4 In some embodiments, the interior of the base plate 21 is formed with a first flow channel 51 for containing a heat exchange medium, and the base plate 21 is configured to manage the temperature of at least two battery cells 11 in the battery cell assembly 10.

[0191] In some embodiments, the base plate 21 may be a solid plate, and the first flow channel 51 may be formed by machining or integral extrusion.

[0192] In some embodiments, the base plate 21 may be composed of multiple plates connected together to form the base plate 21, and a first flow channel 51 may be formed inside the base plate 21.

[0193] In some embodiments, the battery cell 11 may have a bottom surface in the second direction Z, and the base plate 21 may contact the bottom surfaces of at least two battery cells 11. Alternatively, the base plate 21 may contact the bottom surfaces of all battery cells 11.

[0194] The technical solution of this application embodiment achieves heat exchange between the base plate 21 and the battery cell assembly 10 by forming a first flow channel 51 inside the base plate 21 to accommodate the heat exchange medium, which helps to improve the reliability of the battery device 1.

[0195] Please refer to Figure 2 and Figure 4 In some embodiments, the first housing body 20 further includes a first expansion beam 25, which is connected to the bearing surface 211, and one end of the battery cell assembly 10 in the first direction X abuts against the first expansion beam 25.

[0196] In some embodiments, the first box body 20 includes a first expansion beam 25, which can be connected to the bearing surface 211. The first expansion beam 25 can be located between the first side wall panel 22 and the second side wall panel 23. In the first direction X, the distance between the first expansion beam 25 and the first side wall panel 22 can be less than the distance between the first expansion beam 25 and the second side wall panel 23, that is, the first expansion beam 25 is closer to the first side wall panel 22.

[0197] In some embodiments, the first expansion beam 25 abuts against one end of the battery cell assembly 10 in the first direction X, wherein the first expansion beam 25 abuts against the battery cell 11 at that end, that is, the first expansion beam 25 abuts against the first surface 111 of the battery cell 11 at that end.

[0198] In the first direction X, one end of the battery cell assembly 10 can abut against the first expansion beam 25, and the other end can abut against the fourth side wall panel 24.

[0199] Alternatively, the first housing body 20 may also include a second expansion beam 26, and along the first direction X, the first side wall panel 22, the first expansion beam 25, the second expansion beam 26, and the second side wall panel 23 may be arranged sequentially. The battery cell assembly 10 may be located between the first expansion beam 25 and the second expansion beam 26. In the first direction X, both ends of the battery cell assembly 10 may abut against the first expansion beam 25 and the second expansion beam 26, respectively.

[0200] When the battery cell 11 is charging and discharging, it may expand, especially on the surface with the largest area of ​​the battery cell 11, that is, the first surface 111 tends to expand outward in a direction away from the center line of the battery cell 11 in the second direction Z. The first expansion beam 25 abuts against the first surface 111 of the battery cell 11 to resist the expansion force of the battery cell 11.

[0201] The technical solution of this application embodiment, by setting the first expansion beam 25 to abut against one end of the battery cell assembly 10 in the first direction X, is beneficial to resist the expansion force of the battery cell 11.

[0202] Please refer to Figure 2 and Figure 4 and refer to Figure 5 , Figure 5 This is a schematic diagram of the structure of the first expansion beam and the first sidewall panel provided in some embodiments of this application. In some embodiments, along the first direction X, the first sidewall panel 22, the first expansion beam 25, the battery cell assembly 10, and the second sidewall panel 23 are arranged sequentially. The bottom plate 21 is provided with a first medium inlet 212 and a first medium outlet 213 communicating with the first flow channel 51, and both the first medium inlet 212 and the first medium outlet 213 are located between the first expansion beam 25 and the first sidewall panel 22.

[0203] In some embodiments, along the first direction X, the first sidewall panel 22, the first expansion beam 25, the battery cell assembly 10, and the second sidewall panel 23 are arranged sequentially. The battery device 1 may include other electrical components, such as a high-voltage box, electrical control components, etc., and the other electrical components may be disposed between the first expansion beam 25 and the first sidewall panel 22.

[0204] In some embodiments, the base plate 21 is provided with a first medium inlet 212 and a first medium outlet 213, wherein the first medium inlet 212 and the first medium outlet 213 can be pipes, which can extend along the second direction Z. One end of the pipe is connected to the first flow channel 51, and the other end protrudes from the bearing surface 211 in the second direction Z so as to be connected to the connecting pipe for conveying the heat exchange medium.

[0205] In some embodiments, the first medium inlet 212 and the first medium outlet 213 may be disposed between the first side wall panel 22 and the first expansion beam 25, sharing space with other electrical components, which is beneficial to improving the space utilization of the battery device 1.

[0206] In some embodiments, the first medium inlet 212 and the first medium outlet 213 may be spaced apart along a third direction Y.

[0207] In some embodiments, the heat exchange medium enters the first flow channel 51 through the first medium inlet 212 and flows out through the first medium outlet 213, thereby realizing the circulation of the heat exchange medium in the first flow channel 51.

[0208] The technical solution of this application embodiment arranges the first medium inlet 212 and the first medium outlet 213 between the first expansion beam 25 and the first side wall plate 22, which reduces the risk of interference between the first medium inlet 212 and the first medium outlet 213 and the battery cell assembly 10, and helps to improve the reliability of the battery device 1.

[0209] Please refer to Figure 2 , Figure 4 and Figure 5 In some embodiments, the battery device 1 further includes a first connector 60 and a second connector 61, which are respectively disposed on the first side wall plate 22. The battery device 1 also includes a first connecting pipe 62 and a second connecting pipe 63, both of which are located between the first expansion beam 25 and the first side wall plate 22. The first connecting pipe 62 connects the first medium inlet 212 and the first connector 60, and the second connecting pipe 63 connects the first medium outlet 213 and the second connector 61.

[0210] In some embodiments, the battery device 1 includes a first connector 60 and a second connector 61. The first connector 60 and the second connector 61 can be pipes that pass through a first side wall panel 22. One end of the pipe is located on the side of the first side wall panel 22 facing the first expansion beam 25. A first connecting pipe 62 connects the end of the first connector 60 to the first medium inlet 212, and a second connecting pipe 63 connects the end of the second connector 61 to the first medium outlet 213. The other end of the pipe is located on the side of the first side wall panel 22 away from the first expansion beam 25 to facilitate communication with an external container. The external heat exchange medium is transported to the first flow channel 51 through the first connector 60, and the heat exchange medium in the first flow channel 51 is discharged from the battery device 1 through the second connector 61.

[0211] In some embodiments, the first connecting pipe 62 and the second connecting pipe 63 may be made of plastic hose, metal hose, metal rigid pipe, etc.

[0212] In some embodiments, the materials of the first connecting pipe 62 and the second connecting pipe 63 may be the same or different.

[0213] The technical solution of this application embodiment connects the first medium inlet 212 and the first connector 60 via a first connecting pipe 62, and the first medium outlet 213 and the second connector 61 via a second connecting pipe 63, thereby realizing the circulation of the heat exchange medium within the first flow channel 51, which facilitates the management of the temperature of the battery cell assembly 10 by the base plate 21. Simultaneously, the first connecting pipe 62 and the second connecting pipe 63 are located between the first expansion beam 25 and the first side wall plate 22, reducing the risk of interference between the first connecting pipe 62 and the second connecting pipe 63 and the battery cell assembly 10, thus improving the reliability of the battery device 1.

[0214] Please refer to Figure 2 In some embodiments, the first housing body 20 further includes a second expansion beam 26, which is connected to the base plate 21 and is disposed opposite to the first expansion beam 25 along the first direction X. The two ends of the battery cell assembly 10 abut against the first expansion beam 25 and the second expansion beam 26, respectively.

[0215] In some embodiments, along the first direction X, the first sidewall panel 22, the first expansion beam 25, the second expansion beam 26, and the second sidewall panel 23 can be arranged sequentially, and the battery cell assembly 10 can be located between the first expansion beam 25 and the second expansion beam 26. In the first direction X, both ends of the battery cell assembly 10 can abut against the first expansion beam 25 and the second expansion beam 26, respectively.

[0216] In some embodiments, the first expansion beam 25 abuts against one end of the battery cell assembly 10 in the first direction X, wherein the first expansion beam 25 abuts against the battery cell 11 at that end, that is, the first expansion beam 25 abuts against the first surface 111 of the battery cell 11 at that end.

[0217] The second expansion beam 26 abuts against the other end of the battery cell assembly 10 in the first direction X, wherein the second expansion beam 26 abuts against the battery cell 11 at that end, that is, the second expansion beam 26 abuts against the first surface 111 of the battery cell 11 at that end.

[0218] In some embodiments, a portion of the plurality of electrical components may be disposed between the first expansion beam 25 and the first sidewall panel 22, and another portion may be disposed between the second expansion beam 26 and the second sidewall panel 23.

[0219] In some embodiments, multiple electrical components may be disposed between the first expansion beam 25 and the first sidewall panel 22.

[0220] In some embodiments, in the first direction X, the distance between the first expansion beam 25 and the first side wall plate 22 may be greater than the distance between the second expansion beam 26 and the second side wall plate 23.

[0221] In some embodiments, the connection between the first expansion beam 25 and the base plate 21 can be by bonding, welding, integral molding, etc.

[0222] In some embodiments, the connection between the second expansion beam 26 and the base plate 21 can be by bonding, welding, integral molding, etc.

[0223] In some embodiments, the way in which the first expansion beam 25 and the base plate 21 are connected can be the same as or different from the way in which the second expansion beam 26 and the base plate 21 are connected.

[0224] The technical solution of this application embodiment, by setting the first expansion beam 25 and the second expansion beam 26 to abut against the two ends of the battery cell assembly 10 in the first direction X, is beneficial to resist the expansion force of the battery cell 11.

[0225] Please refer to Figure 6 , Figure 6 This is an exploded view of the structure of a battery device provided in some other embodiments of this application. In some embodiments, there are multiple battery cell assemblies 10, which are arranged along a third direction Y. The first housing body 20 also includes a partition plate 27, which is disposed between two adjacent battery cell assemblies 10. In the first direction X, the two ends of the partition plate 27 are respectively connected to a first expansion beam 25 and a second expansion beam 26.

[0226] In some embodiments, the number of battery cell components 10 can be multiple, and the multiple battery cell components 10 can be connected in parallel or in series.

[0227] In some embodiments, a plurality of battery cell assemblies 10 may be arranged along a third direction Y, wherein the thickness direction of the separator 27 may be parallel to the third direction Y, and the separator 27 may be disposed between two adjacent battery cell assemblies 10.

[0228] Taking two battery cell modules 10 as an example, the number of separators 27 can be one, with the separator 27 located between the two battery cell modules 10.

[0229] Taking a scenario where there are three battery cell modules 10, the number of separator plates 27 can be two. The two separator plates 27 are arranged at intervals along the third direction Y. Along the third direction Y, a third side wall plate 32, a first battery cell module 10, a separator plate 27, a second battery cell module 10, another separator plate 27, a third battery cell module 10, and another third side wall plate 32 are arranged in sequence.

[0230] In some embodiments, the number of battery cell assemblies 10 is two.

[0231] In some embodiments, the partition plate 27 may extend along a first direction X, and the two ends of the partition plate 27 in the first direction X may be connected to the first expansion beam 25 and the second expansion beam 26, respectively.

[0232] In some embodiments, the partition plate 27 can be connected to the first expansion beam 25 by bonding, welding, integral molding, etc.

[0233] In some embodiments, the partition plate 27 can be connected to the second expansion beam 26 by bonding, welding, integral molding, etc.

[0234] In some embodiments, the way in which the partition plate 27 connects to the first expansion beam 25 can be the same as or different from the way in which the partition plate 27 connects to the second expansion beam 26.

[0235] During charging and discharging, the battery cell 11 expands, and the first expansion beam 25 and the second expansion beam 26 resist the expansion force of the battery cell 11. The two ends of the separator 27 are respectively connected to the first expansion beam 25 and the second expansion beam 26, so that in the first direction X, the first expansion beam 25 and the second expansion beam 26 are respectively subjected to the tensile force from the separator 27, which helps to improve the reliability of the first expansion beam 25 and the second expansion beam 26 in resisting the expansion of the battery cell 11.

[0236] The technical solution of this application embodiment reduces the risk of interference between two adjacent battery cell assemblies 10 by placing a separator 27 between them. Simultaneously, the separator 27 connects the first expansion beam 25 and the second expansion beam 26, improving the reliability of the first expansion beam 25 and the second expansion beam 26 in resisting the expansion force of the battery cell 11.

[0237] Please refer to Figure 6 and refer to Figure 7 , Figure 7 This is a schematic diagram of the internal structure of a battery device provided in some other embodiments of this application. In some embodiments, a second flow channel 52 for accommodating a heat exchange medium is formed inside the partition plate 27, and the partition plate 27 is configured to manage the temperature of at least two battery cells 11 in the battery cell assembly 10.

[0238] In some embodiments, the separator 27 may be part of a thermal management assembly. The battery cell assembly 10 may have opposite sides in the third direction Y. Taking two battery cell assemblies 10 as an example, in the third direction Y, one side of one battery cell assembly 10 may be opposite to one side of another battery cell assembly 10. The separator 27 may have two opposite surfaces, one surface of which may be thermally connected to one side of one battery cell assembly 10, and the other surface may be thermally connected to one side of the other battery cell assembly 10.

[0239] In some embodiments, the partition plate 27 may be a solid plate, and the second flow channel 52 may be formed by machining or integral extrusion.

[0240] In some embodiments, the partition plate 27 may be composed of multiple plates connected together to form the partition plate 27, and a second flow channel 52 may be formed inside the partition plate 27.

[0241] In some embodiments, the battery cell 11 may have a side in the third direction Y, and the separator 27 may contact the side of at least two battery cells 11 of a battery cell assembly 10. Alternatively, the separator 27 may contact the side of all battery cells 11 of a battery cell assembly 10.

[0242] The technical solution of this application embodiment achieves heat exchange between the separator 27 and the battery cell assembly 10 by forming a second flow channel 52 inside the separator 27 to accommodate the heat exchange medium, which helps to improve the reliability of the battery device 1.

[0243] Please refer to Figure 6 and Figure 7 and refer to Figure 8 , Figure 8This is a schematic diagram of the structure of the base plate and partition plate provided in some embodiments of this application. In some embodiments, along the first direction X, the base plate 21 includes a first sub-base plate 214, a second sub-base plate 215, and a third sub-base plate 216 arranged sequentially. The first sub-base plate 214 is connected to the first expansion beam 25 and the first side wall plate 22. A bearing surface 211 is disposed on the second sub-base plate 215. A first flow channel 51 is formed inside the second sub-base plate 215. The third sub-base plate 216 is connected to the second expansion beam 26 and the second side wall plate 23. The partition plate 27 is connected to the second sub-base plate 215.

[0244] In some embodiments, along the first direction X, the base plate 21 may include a first sub-base plate 214, a second sub-base plate 215 and a third sub-base plate 216 arranged in sequence.

[0245] The first sub-base plate 214 is connected to the first expansion beam 25 and the first side wall plate 22. The first sub-base plate 214 can be welded to the first expansion beam 25 and the first side wall plate 22, or the first sub-base plate 214 can be integrally formed with the first expansion beam 25 and the first side wall plate 22.

[0246] The third sub-base plate 216 is connected to the second expansion beam 26 and the second side wall plate 23. The third sub-base plate 216, the second expansion beam 26 and the second side wall plate 23 can be welded together, or the third sub-base plate 216, the second expansion beam 26 and the second side wall plate 23 can be integrally formed.

[0247] In some embodiments, the bearing surface 211 may be disposed on the second sub-base plate 215, that is, the second sub-base plate 215 bears the battery cell assembly 10. With the second direction Z as the projection direction, the orthographic projection of the second sub-base plate 215 can cover the orthographic projection of the battery cell assembly 10.

[0248] In some embodiments, the partition plate 27 can be connected to the second sub-base plate 215. The connection method between the partition plate 27 and the second sub-base plate 215 can be bonding, welding, integral molding, etc.

[0249] The technical solution of this application embodiment connects the first sub-base plate 214 to the first expansion beam 25 and the first side wall plate 22, the third sub-base plate 216 to the second expansion beam 26 and the second side wall plate 23, and the second sub-base plate 215 to the first sub-base plate 214 and the third sub-base plate 216, which facilitates the connection of the first expansion beam 25, the first side wall plate 22, the second expansion beam 26, the second side wall plate 23 and the base plate 21.

[0250] Please refer to Figures 6 to 8In some embodiments, the second sub-base plate 215 includes a first portion 2151, a second portion 2152 and a third portion 2153 arranged along the second direction Z. The second portion 2152 is integrally formed with the partition plate 27, and the first portion 2151 and the third portion 2153 are connected through the second portion 2152.

[0251] In some embodiments, the second sub-base plate 215 may include a first portion 2151, a second portion 2152, and a third portion 2153 arranged along a third direction Y, wherein the thickness direction of the first portion 2151, the thickness direction of the second portion 2152, and the thickness direction of the third portion 2153 are all parallel to the second direction Z.

[0252] In some embodiments, the second part 2152 and the partition plate 27 are integrally formed, wherein the thickness direction of the second part 2152 may be parallel to the second direction Z, and the thickness direction of the partition plate 27 may be parallel to the third direction Y, that is, the partition plate 27 and the second part 2152 integrally formed may be in an inverted "T" shape.

[0253] In some embodiments, the interior of the first portion 2151 and the interior of the third portion 2153 may both have grooves, and the interior of the second portion 2152 has a channel. The second portion 2152 connects the first portion 2151 and the third portion 2153, and the channel of the second portion 2152 connects the groove of the first portion 2151 and the groove of the third portion 2153, so that the first portion 2151, the second portion 2152 and the third portion 2153 together form the first flow channel 51.

[0254] The first medium outlet 213 can be connected to the groove of the first part 2151, and the first medium inlet 212 can be connected to the groove of the third part 2153.

[0255] In some embodiments, the second flow channel 52 inside the partition plate 27 may communicate with the channel of the second portion 2152, so that the second flow channel 52 of the partition plate 27 communicates with the first flow channel 51 of the second sub-base plate 215.

[0256] The technical solution of this application embodiment is that the second part 2152 is integrally formed with the partition plate 27, and the first part 2151 and the third part 2153 are connected through the second part 2152, which facilitates the connection between the partition plate 27 and the bottom plate 21.

[0257] Please refer to Figures 6 to 8 and refer to Figure 9 , Figure 9 for Figure 8Enlarged view at point B. In some embodiments, the first expansion beam 25 is provided with a first through hole 251, which penetrates the first expansion beam 25 along a first direction X, and the partition plate 27 passes through the first through hole 251. The partition plate 27 is provided with a second medium inlet 271 and a second medium outlet 272 communicating with the second flow channel 52, and both the second medium outlet 272 and the second medium inlet 271 are located between the first expansion beam 25 and the first side wall plate 22.

[0258] In some embodiments, the first expansion beam 25 may be provided with a first through hole 251 extending through the first expansion beam 25 along the first direction X, and the partition plate 27 is disposed in the first through hole 251 such that a portion of the partition plate 27 is located between the first expansion beam 25 and the second expansion beam 26, and another portion is located between the first expansion beam 25 and the first side wall plate 22.

[0259] The second medium inlet 271 and the second medium outlet 272 can be disposed in another part of the partition plate 27, such that the second medium inlet 271 and the second medium outlet 272 are located between the first expansion beam 25 and the first side wall plate 22.

[0260] In some embodiments, the battery device 1 may include a third connecting pipe and a fourth connecting pipe. The third connecting pipe may connect the second medium inlet 271 and the first connector 60, and the fourth connecting pipe may connect the second medium outlet 272 and the second connector 61, so that the heat exchange medium enters the second flow channel 52 through the second medium inlet 271 from the first connector 60, and is discharged from the battery device 1 through the second medium outlet 272 and the second connector 61.

[0261] It should be noted that the first connector 60 may have multiple interfaces, the first connecting tube 62 is connected to one of the interfaces of the first connector 60, and the third connecting tube is connected to another interface of the first connector 60.

[0262] Similarly, the second connector 61 may have multiple interfaces, with the second connecting pipe 63 connected to one of the interfaces of the second connector 61 and the fourth connecting pipe connected to another interface of the second connector 61.

[0263] In some embodiments, since the thickness of the partition plate 27 is small, the second medium outlet 272 and the second medium inlet 271 can be spaced apart along the second direction Z.

[0264] In some embodiments, the second medium outlet 272 and the second medium inlet 271 can be pipes that extend along a first direction X, with one end of the pipe extending into the interior of the partition plate 27 and communicating with the second flow channel 52, and the other end of the pipe extending out to facilitate connection with the third connecting pipe and the fourth connecting pipe.

[0265] The technical solution of this application embodiment provides a first through hole 251 in the first expansion beam 25, through which the partition plate 27 passes, facilitating the connection between the partition plate 27 and the first expansion beam 25 and improving the reliability of the connection. Simultaneously, the partition plate 27 passing through the first through hole 251 positions the second medium inlet 271 and the second medium outlet 272 on the side of the first expansion beam 25 away from the battery cell assembly 10, reducing the risk of interference between the second medium inlet 271 and the second medium outlet 272 and the battery cell assembly 10, thus improving the reliability of the battery device 1.

[0266] Please refer to Figures 6 to 8 and refer to Figure 10 , Figure 10 for Figure 8 Enlarged view at point C. In some embodiments, a connecting block 273 is provided at the end of the partition plate 27 away from the first expansion beam 25, and a groove 261 is provided on the side of the second expansion beam 26 facing the first expansion beam 25. At least a portion of the connecting block 273 is embedded in the groove 261 to restrict the partition plate 27 from disengaging from the second expansion beam 26.

[0267] In some embodiments, the connecting block 273 may be disposed at one end of the partition plate 27 away from the first expansion beam 25. The connecting block 273 can be regarded as a limiting structure formed at one end of the partition plate 27 away from the first expansion beam 25. The connecting block 273 is used to cooperate with the second expansion beam 26 to restrict the partition plate 27 from disengaging from the second expansion beam 26.

[0268] In some embodiments, the contours of the groove 261 and the connecting block 273 can match, facilitating the assembly and positioning of the partition plate 27 and the second expansion beam 26. When the partition plate 27 is assembled with the first expansion beam 25 and the second expansion beam 26, at least a portion of the connecting block 273 is embedded in the groove 261, and the partition plate 27 is connected to the first expansion beam 25 and the second expansion beam 26.

[0269] The technical solution of this application embodiment is that the connecting block 273 of the partition plate 27 is set in the groove 261 of the second expansion beam 26, which facilitates the connection between the partition plate 27 and the second expansion beam 26 and helps to improve the reliability of the connection between the partition plate 27 and the second expansion beam 26.

[0270] Please refer to Figure 4 and Figure 7 In some embodiments, a third flow channel 53 for containing heat exchange medium is formed inside the top plate 31, and the top plate 31 is configured to manage the temperature of at least two battery cells 11 in the battery cell assembly 10.

[0271] In some embodiments, the battery cell assembly 10 may have opposite sides in the second direction Z, and the top plate 31 may be thermally connected to one side of the battery cell assembly 10.

[0272] In some embodiments, the top plate 31 may be a solid plate, and the third flow channel 53 may be formed by machining or integral extrusion.

[0273] In some embodiments, the top plate 31 may be composed of multiple plates connected together to form the top plate 31, and a third flow channel 53 may be formed inside the top plate 31.

[0274] In some embodiments, the battery cell 11 may have a top surface in the second direction Z, and the top plate 31 may contact the top surfaces of at least two battery cells 11 of a battery cell assembly 10. Alternatively, the top plate 31 may contact the top surfaces of all battery cells 11 of a battery cell assembly 10.

[0275] The technical solution of this application embodiment achieves heat exchange between the top plate 31 and the battery cell assembly 10 by forming a third flow channel 53 inside the top plate 31 for accommodating the heat exchange medium, which helps to improve the reliability of the battery device 1.

[0276] Please refer to Figure 4 and Figure 7 In some embodiments, the interior of the third sidewall 32 is formed with a fourth flow channel 54 for containing heat exchange medium, and the third sidewall 32 is configured to manage the temperature of at least two battery cells 11 in the battery cell assembly 10.

[0277] In some embodiments, the battery cell assembly 10 may have two opposing sides in the third direction Y. Taking two battery cell assemblies 10 as an example, in the third direction Y, one side of one battery cell assembly 10 may be disposed opposite to one side of another battery cell assembly 10, one third sidewall 32 may be thermally connected to one side of one battery cell assembly 10, and the other third sidewall 32 may be thermally connected to one side of the other battery cell assembly 10.

[0278] In some embodiments, the third sidewall panel 32 may be a solid plate, and the fourth flow channel 54 may be formed by machining or integral extrusion.

[0279] In some embodiments, the third sidewall panel 32 may be composed of multiple plates connected to form the third sidewall panel 32, and a fourth flow channel 54 may be formed inside the third sidewall panel 32.

[0280] In some embodiments, the battery cell 11 may have a side in the third direction Y, and the third sidewall 32 may contact the side of at least two battery cells 11 of a battery cell assembly 10. Alternatively, the third sidewall 32 may contact the side of all battery cells 11 of a battery cell assembly 10.

[0281] The technical solution of this application embodiment achieves heat exchange between the third side wall plate 32 and the battery cell assembly 10 by forming a fourth flow channel 54 inside the third side wall plate 32 for accommodating the heat exchange medium, which helps to improve the reliability of the battery device 1.

[0282] Please refer to Figure 4 and Figure 7 In some embodiments, the third sidewall panel 32 and the top panel 31 are integrally formed.

[0283] In some embodiments, the third sidewall panel 32 and the top plate 31 can be integrally formed. For example, the third sidewall panel 32 and the top plate 31 can be integrally cast, or the third sidewall panel 32 and the top plate 31 can be integrally extruded.

[0284] The technical solution of this application embodiment is that the third side wall panel 32 and the top plate 31 are integrally formed, which facilitates the processing of the second box body 30.

[0285] Please refer to Figure 4 and refer to Figure 11 , Figure 11 This is a schematic diagram of a battery device from another perspective, provided for some embodiments of this application. In some embodiments, a third flow channel 53 for containing a heat exchange medium is formed inside the top plate 31. The third flow channel 53 and the fourth flow channel 54 are interconnected. A third medium inlet 321 communicating with the fourth flow channel 54 is provided on one third side wall plate 32, and a third medium outlet 322 communicating with the fourth flow channel 54 is provided on the other third side wall plate 32.

[0286] In some embodiments, two third sidewall panels 32 are respectively connected to the two ends of the top plate 31 in the third direction Y. One of the fourth flow channels 54 is connected to the end of the third flow channel 53 in the third direction Y at the end opposite to the bottom plate 21 in the second direction Z. The other fourth flow channel 54 is connected to the other end of the third flow channel 53 in the third direction Y at the end opposite to the bottom plate 21 in the second direction Z.

[0287] In some embodiments, a third sidewall panel 32 may be provided with a third medium inlet 321 communicating with the third flow channel 53 of the third sidewall panel 32, and another third sidewall panel 32 may be provided with a third medium outlet 322 communicating with the third flow channel 53 of the other third sidewall panel 32.

[0288] In some embodiments, the third medium outlet 322 and the third medium inlet 321 may be spaced apart along a third direction Y.

[0289] In some embodiments, with the third direction Y as the projection direction, the orthographic projection of the third medium outlet 322 and the orthographic projection of the third medium inlet 321 can overlap.

[0290] In some embodiments, the battery device 1 may include a fifth connecting pipe and a sixth connecting pipe. The fifth connecting pipe connects the third medium inlet 321 and the first connector 60, and the sixth connecting pipe connects the third medium outlet 322 and the second connector 61. This allows the heat exchange medium to enter a fourth flow channel 54 through the third medium inlet 321 from the first connector 60, and then through the third flow channel 53 and another fourth flow channel 54, before exiting the battery device 1 from the third medium outlet 322 and the second connector 61.

[0291] It should be noted that the first connector 60 may have multiple interfaces, the first connecting tube 62 is connected to one of the interfaces of the first connector 60, the third connecting tube is connected to another interface of the first connector 60, and the fifth connecting tube is connected to yet another interface of the first connector 60.

[0292] Similarly, the second connector 61 may have multiple interfaces, with the second connecting tube 63 connected to one of the interfaces of the second connector 61, the fourth connecting tube connected to another interface of the second connector 61, and the sixth connecting tube connected to yet another interface of the second connector 61.

[0293] The technical solution of this application embodiment is to set a third medium inlet 321 on one third side wall plate 32 and a third medium outlet 322 on another third side wall plate 32 to realize the circulation of heat exchange medium in the third flow channel 53 and the fourth flow channel 54, which is beneficial for the third side wall plate 32 and the top plate 31 to manage the temperature of the battery cell assembly 10.

[0294] Please refer to Figure 4 In some embodiments, a battery cell assembly 10 is disposed between the two third sidewall panels 32, one third sidewall panel 32 is thermally connected to one side of the battery cell assembly 10 in the third direction Y, and the other third sidewall panel 32 is thermally connected to the other side of the battery cell assembly 10 in the third direction Y.

[0295] In some embodiments, the number of battery cell assemblies 10 may be one, which has two sides in the third direction Y. One third sidewall 32 is thermally connected to one side of the battery cell assembly 10, and the other third sidewall 32 is thermally connected to the other side of the battery cell assembly 10.

[0296] The technical solution of this application embodiment is to thermally connect one third sidewall 32 to one side of the battery cell assembly 10 in the third direction Y, and the other third sidewall 32 to the other side of the battery cell assembly 10 in the third direction Y. This can better manage the temperature of the battery cell 11, reduce the risk of the battery cell 11 temperature affecting the charging and discharging efficiency, and help improve the reliability of the battery device 1.

[0297] Please refer to Figure 7 In some embodiments, a plurality of battery cell assemblies 10 are disposed between two third sidewall panels 32, and the plurality of battery cell assemblies 10 are arranged along a third direction Y. The first housing body 20 also includes a partition plate 27 disposed between two adjacent battery cell assemblies 10, and the partition plate 27 has a second flow channel 52 formed inside for accommodating heat exchange medium. The partition plate 27 is configured to manage the temperature of at least two battery cells 11 in the battery cell assembly 10.

[0298] In some embodiments, the number of battery cell assemblies 10 can be multiple, the multiple battery cell assemblies 10 are arranged along the third direction Y, and the multiple battery cell assemblies 10 are located between two third sidewall panels 32.

[0299] The separator 27 is located between two adjacent battery cell modules 10, and the separator 27 has two opposing surfaces in the third direction Y.

[0300] Taking two battery cell modules 10 as an example, in the third direction Y, one side of one battery cell module 10 is thermally connected to a third sidewall 32, and the other side of one battery cell module 10 is thermally connected to a surface of the separator 27. One side of the other battery cell module 10 is thermally connected to another surface of the separator 27, and the other side of the other battery cell 11 is thermally connected to another third sidewall 32.

[0301] The technical solution of this application embodiment, through the joint thermal connection of two third side wall plates 32 and partition plate 27 with the two sides of the battery cell assembly 10 in the third direction Y, can better manage the temperature of the battery cell 11, reduce the risk of the battery cell 11 temperature affecting the charging and discharging efficiency, and help improve the reliability of the battery device 1.

[0302] Please refer to 4 and Figure 7 and refer to Figure 12 and Figure 13 , Figure 12 This is a schematic diagram illustrating the assembly of a heat-conducting component with a battery cell according to some embodiments of this application. Figure 13This is a schematic diagram of the structure of a heat-conducting component provided in some embodiments of this application. In some embodiments, the outer surface of the battery cell 11 is covered with a heat-conducting component 70. The heat-conducting component 70 includes a first heat-conducting part 71 and a second heat-conducting part 72 connected to each other. The first heat-conducting part 71 is thermally connected to a first surface 111, and the second heat-conducting part 72 is thermally connected to at least one of the bottom plate 21, the top plate 31, and the two third sidewall plates 32.

[0303] In some embodiments, the heat-conducting element 70 may include a first heat-conducting part 71 and a second heat-conducting part 72 connected to each other, and the first heat-conducting part 71 and the second heat-conducting part 72 are thermally connected.

[0304] In some embodiments, the first heat-conducting part 71 may be in the form of a plate, and the first heat-conducting part 71 may be thermally connected to the first surface 111. The thermal connection may be such that the first heat-conducting part 71 covers the first surface 111.

[0305] It should be noted that the battery cell 11 may have two first surfaces 111 in the first direction X, and the first heat-conducting part 71 covers one of the first surfaces 111.

[0306] In some embodiments, with the first direction X as the projection direction, the orthographic projection of the first heat-conducting part 71 can overlap with the orthographic projection of the outer casing 115 of the battery cell 11. It should be noted that the orthographic projection of the electrode terminal 114 of the battery cell 11 may extend beyond the orthographic projection of the first heat-conducting part 71.

[0307] In some embodiments, the second heat-conducting part 72 may be in the form of a plate, and the second heat-conducting part 72 may be thermally connected to at least one of the bottom plate 21, the top plate 31 and the two third side wall plates 32.

[0308] The base plate 21 can be thermally connected to the second heat-conducting part 72 and exchange heat with the first surface 111 through the first heat-conducting part 71.

[0309] The top plate 31 can be thermally connected to the second heat-conducting part 72 and exchange heat with the first surface 111 through the first heat-conducting part 71.

[0310] At least one of the third sidewall panels 32 can be thermally connected to the second heat-conducting part 72 and exchange heat with the first surface 111 through the first heat-conducting part 71.

[0311] In some embodiments, the number of heat-conducting elements 70 can be multiple. One heat-conducting element 70 can be provided for one battery cell 11, or one heat-conducting element 70 can be provided for two battery cells 11, or one heat-conducting element 70 can be provided for two or more battery cells 11.

[0312] In some embodiments, taking one second heat-conducting part 72 as an example, one heat-conducting element 70 is provided for each of two battery cells 11. The base plate 21 can be thermally connected to one side of the battery cell assembly 10 in the second direction Z, and the second heat-conducting part 72 can be located between the base plate 21 and the battery cell assembly 10. The second heat-conducting part 72 is connected to the lower end of the first heat-conducting part 71 in the second direction Z, and with the second direction Z as the projection direction, the orthographic projection of the second heat-conducting part 72 overlaps with the orthographic projection of the two battery cells 11.

[0313] The top plate 31 can be thermally connected to one side of the battery cell 11 in the second direction Z, and the second thermally conductive part 72 can be located between the top plate 31 and the battery cell assembly 10. The second thermally conductive part 72 is connected to the upper end of the first thermally conductive part 71 in the second direction Z, and with the second direction Z as the projection direction, the orthographic projection of the second thermally conductive part 72 overlaps with the orthographic projection of the two battery cells 11.

[0314] The number of second heat-conducting parts 72 can be one. A third sidewall plate 32 can be thermally connected to one side of the battery cell assembly 10 in the third direction Y. The second heat-conducting part 72 can be located between the third sidewall plate 32 and the battery cell assembly 10. The second heat-conducting part 72 is connected to one end of the first heat-conducting part 71 in the third direction Y. With the third direction Y as the projection direction, the orthographic projection of the second heat-conducting part 72 overlaps with the orthographic projection of the two battery cells 11.

[0315] There can be two second heat-conducting parts 72. Each second heat-conducting part 72 can be thermally connected to one of the two third sidewall panels 32. One second heat-conducting part 72 can be located between one third sidewall panel 32 and the battery cell assembly 10, and the other second heat-conducting part 72 can be located between the other third sidewall panel 32 and the battery cell assembly 10. The two second heat-conducting parts 72 are respectively connected to one end of the first heat-conducting part 71 in the third direction Y. With the third direction Y as the projection direction, the orthographic projection of the second heat-conducting part 72 overlaps with the orthographic projection of the two battery cells 11.

[0316] In some embodiments, taking two second heat-conducting parts 72 as an example, with one heat-conducting element 70 corresponding to two battery cells 11. The bottom plate 21 and the top plate 31 can both be thermally connected to the battery cell assembly 10. One second heat-conducting part 72 can be located between the bottom plate 21 and the battery cell assembly 10, and the other second heat-conducting part 72 can be located between the top plate 31 and the battery cell assembly 10. The two second heat-conducting parts 72 are respectively connected to the two ends of the first heat-conducting part 71 in the second direction Z. Taking the second direction Z as the projection direction, the orthographic projection of one second heat-conducting part 72 overlaps with the orthographic projection of the two battery cells 11, and the orthographic projection of the other second heat-conducting part 72 also overlaps with the orthographic projection of the two battery cells 11.

[0317] The base plate 21 and a third sidewall plate 32 can be thermally connected to the battery cell assembly 10. A second thermally conductive part 72 can be located between the base plate 21 and the battery cell assembly 10, and another second thermally conductive part 72 can be located between the third sidewall plate 32 and the battery cell assembly 10. One second thermally conductive part 72 is connected to the lower end of the first thermally conductive part 71 in the second direction Z, and another second thermally conductive part 72 is connected to one end of the first thermally conductive part 71 in the third direction Y. With the second direction Z as the projection direction, the orthographic projection of one second thermally conductive part 72 overlaps with the orthographic projection of two battery cells 11. With the third direction Y as the projection direction, the orthographic projection of the other second thermally conductive part 72 overlaps with the orthographic projection of two battery cells 11.

[0318] The top plate 31 and a third side wall plate 32 can be thermally connected to the battery cell assembly 10. A second thermally conductive part 72 can be located between the top plate 31 and the battery cell assembly 10, and another second thermally conductive part 72 can be located between the third side wall plate 32 and the battery cell assembly 10. One second thermally conductive part 72 is connected to the upper end of the first thermally conductive part 71 in the second direction Z, and another second thermally conductive part 72 is connected to one end of the first thermally conductive part 71 in the third direction Y. With the second direction Z as the projection direction, the orthographic projection of one second thermally conductive part 72 overlaps with the orthographic projection of two battery cells 11. With the third direction Y as the projection direction, the orthographic projection of the other second thermally conductive part 72 overlaps with the orthographic projection of two battery cells 11.

[0319] In some embodiments, taking three second heat-conducting parts 72 as an example, with one heat-conducting element 70 corresponding to two battery cells 11. The base plate 21, top plate 31, and a third sidewall plate 32 are thermally connected to the battery cell assembly 10. One second heat-conducting part 72 can be located between the base plate 21 and the battery cell assembly 10, another second heat-conducting part 72 can be located between the top plate 31 and the battery cell assembly 10, and yet another second heat-conducting part 72 can be located between the third sidewall plate 32 and the battery cell assembly 10. One second heat-conducting part 72 is connected to one end of the first heat-conducting part 71 in the second direction Z, another second heat-conducting part 72 is connected to the other end of the first heat-conducting part 71 in the second direction Z, and yet another second heat-conducting part 72 is connected to one end of the first heat-conducting part 71 in the third direction Y. With the second direction Z as the projection direction, the orthographic projection of one second heat-conducting part 72 overlaps with the orthographic projection of the two battery cells 11, and the orthographic projection of the other second heat-conducting part 72 also overlaps with the orthographic projection of the two battery cells 11. With the third direction Y as the projection direction, the orthographic projection of another second heat-conducting part 72 overlaps with the orthographic projection of two battery cells 11.

[0320] The base plate 21 and the two third sidewalls 32 are thermally connected to the battery cell assembly 10. A second thermally conductive part 72 can be located between the base plate 21 and the battery cell assembly 10, another second thermally conductive part 72 can be located between one third sidewall 32 and the battery cell assembly 10, and yet another second thermally conductive part 72 can be located between another third sidewall 32 and the battery cell assembly 10. One second thermally conductive part 72 is connected to the lower end of the first thermally conductive part 71 in the second direction Z, another second thermally conductive part 72 is connected to one end of the first thermally conductive part 71 in the third direction Y, and yet another second thermally conductive part 72 is connected to the other end of the first thermally conductive part 71 in the third direction Y. With the second direction Z as the projection direction, the orthographic projection of one second thermally conductive part 72 overlaps with the orthographic projection of two battery cells 11. With the third direction Y as the projection direction, the orthographic projection of another second thermally conductive part 72 overlaps with the orthographic projection of two battery cells 11, and yet another second thermally conductive part 72 overlaps with the orthographic projection of two battery cells 11.

[0321] The technical solution of this application embodiment, by setting a heat-conducting component 70, makes the first heat-conducting part 71 thermally connected to the first surface 111, and the second heat-conducting part 72 thermally connected to at least one of the bottom plate 21, the top plate 31 and the two third side wall plates 32. This allows at least one of the bottom plate 21, the top plate 31 and the two third side wall plates 32 to regulate the temperature of the first surface 111 through the heat-conducting component 70. This can better manage the temperature of the battery cell 11, reduce the risk of the battery cell 11 temperature affecting the charging and discharging efficiency, and help improve the reliability of the battery device 1.

[0322] Please refer to Figure 4 , Figure 12 and Figure 13 In some embodiments, the battery cell 11 includes an electrode terminal 114 located on the side of the battery cell 11 facing the top plate 31. The second heat-conducting part 72 is thermally connected to the bottom plate 21 and the two third sidewall plates 32.

[0323] In some embodiments, the number of second heat-conducting parts 72 can be three, taking one heat-conducting element 70 corresponding to two battery cells 11 as an example. The base plate 21 and the two third sidewall plates 32 are thermally connected to the battery cell assembly 10. One second heat-conducting part 72 can be located between the base plate 21 and the battery cell assembly 10, another second heat-conducting part 72 can be located between one third sidewall plate 32 and the battery cell assembly 10, and yet another second heat-conducting part 72 can be located between another third sidewall plate 32 and the battery cell assembly 10. One second heat-conducting part 72 is connected to one end of the first heat-conducting part 71 in the second direction Z, another second heat-conducting part 72 is connected to one end of the first heat-conducting part 71 in the third direction Y, and yet another second heat-conducting part 72 is connected to the other end of the first heat-conducting part 71 in the third direction Y. With the second direction Z as the projection direction, the orthographic projection of one second heat-conducting part 72 overlaps with the orthographic projection of the two battery cells 11. With the third direction Y as the projection direction, the orthographic projection of another second heat-conducting part 72 overlaps with the orthographic projection of two battery cells 11, and the orthographic projection of yet another second heat-conducting part 72 overlaps with the orthographic projection of two battery cells 11.

[0324] The technical solution of this application embodiment, through the thermal connection between the second heat-conducting part 72 and the base plate 21 and the two third side wall plates 32, can better manage the temperature of the battery cell 11, reduce the risk of the temperature of the battery cell 11 affecting the charging and discharging efficiency, and at the same time reduce the risk of interference between the heat-conducting part 70 and the electrode terminal 114, which is conducive to improving the reliability of the battery device 1.

[0325] Please refer to Figure 13 In some embodiments, the heat-conducting element 70 is made of at least one of graphene, carbon nanotubes, and silicene.

[0326] In some embodiments, the heat-conducting element 70 may be made of graphene.

[0327] The technical solutions of this application embodiment have good thermal conductivity of graphene, carbon nanotubes and silicene. By setting the material of the heat-conducting component 70 to include at least one of the above materials, the temperature of the battery cell 11 can be better managed, reducing the risk that the temperature of the battery cell 11 will affect the charging and discharging efficiency, and improving the reliability of the battery device 1.

[0328] Please refer to Figure 2 and Figure 4 In some embodiments, in the second direction Z, the battery cell 11 has a second surface 112 facing the top plate 31, and the battery cell 11 includes an electrode terminal 114 disposed on the second surface 112. A third flow channel 53 for accommodating a heat exchange medium is formed inside the top plate 31, and the top plate 31 is thermally connected to the second surface 112.

[0329] In some embodiments, in the second direction Z, the battery cell 11 may have two opposing surfaces, wherein the upper surface may be the second surface 112, which faces the top plate 31. The electrode terminal 114 is disposed on the second surface 112, that is, the electrode terminal 114 of the battery cell 11 is disposed upward, and the second surface 112 is the surface of the end cap 1151.

[0330] In some embodiments, the top plate 31 is thermally connected to the battery cell assembly 10, that is, a third flow channel 53 for accommodating the heat exchange medium is formed inside the top plate 31. The top plate 31 is also thermally connected to the second surface 112.

[0331] The technical solution of this application embodiment, through the thermally conductive connection between the top plate 31 and the second surface 112, can better manage the temperature of the battery cell 11, reduce the risk of the battery cell 11 temperature affecting the charging and discharging efficiency, and help improve the reliability of the battery device 1.

[0332] Please refer to Figure 2 and Figure 4 In some embodiments, in the second direction Z, the battery cell 11 has a second surface 112 facing the top plate 31, and the battery cell 11 includes electrode terminals 114 disposed on the second surface 112. The battery cell assembly 10 also includes a busbar 12 electrically connected to the electrode terminals 114 of a plurality of battery cells 11, and a third flow channel 53 for accommodating a heat exchange medium is formed inside the top plate 31, and the top plate 31 is thermally connected to the busbar 12.

[0333] In some embodiments, in the second direction Z, the battery cell 11 may have two opposing surfaces, wherein the upper surface may be the second surface 112, which faces the top plate 31. The electrode terminal 114 is disposed on the second surface 112, that is, the electrode terminal 114 of the battery cell 11 is disposed upward, and the second surface 112 is the surface of the end cap 1151.

[0334] In some embodiments, the top plate 31 is thermally connected to the battery cell assembly 10, that is, a third flow channel 53 for accommodating the heat exchange medium is formed inside the top plate 31. The busbar component 12 is electrically connected to the electrode terminals 114 of the plurality of battery cells 11, and the top plate 31 is thermally connected to the battery cells 11 through the busbar component 12.

[0335] The technical solution of this application embodiment, through the thermal connection between the top plate 31 and the busbar component 12, can better manage the temperature of the battery cell 11, reduce the risk of the battery cell 11 temperature affecting the charging and discharging efficiency, and help improve the reliability of the battery device 1.

[0336] Please refer to Figure 14 , Figure 14This is an exploded view of the structure of a battery device provided in some embodiments of this application. In some embodiments, in the third direction Y, the battery cell 11 has a third surface 113 facing the third sidewall 32, and the battery cell 11 includes an electrode terminal 114 disposed on the third surface 113. A fourth flow channel 54 for accommodating a heat exchange medium is formed inside the third sidewall 32, and the third sidewall 32 is thermally connected to the third surface 113.

[0337] In some embodiments, in the third direction Y, the battery cell 11 may have two opposing third surfaces 113, one third surface 113 facing one third sidewall 32 and the other third surface 113 facing another third sidewall 32. Electrode terminals 114 are disposed on the third surface 113, that is, on the side of the electrode terminals 114 of the battery cell 11, and the third surface 113 is the surface of the end cap 1151.

[0338] In some embodiments, the third sidewall 32 is thermally connected to the battery cell assembly 10, that is, a fourth flow channel 54 for accommodating heat exchange medium is formed inside the third sidewall 32. The third sidewall 32 is also thermally connected to the third surface 113.

[0339] In some embodiments, the number of electrode terminals 114 can be two, and the two electrode terminals 114 can be disposed on the same third surface 113. A fourth flow channel 54 can be formed on the third sidewall 32 facing the third surface 113 on which the electrode terminals 114 are disposed, and the third sidewall 32 is thermally connected to the third surface 113.

[0340] In some embodiments, the number of electrode terminals 114 can be two, with one electrode terminal 114 disposed on one third surface 113 and the other electrode terminal 114 disposed on another third surface 113. Both third sidewall plates 32 can be provided with fourth flow channels 54, with one third sidewall plate 32 being thermally connected to one third surface 113 and the other third sidewall plate 32 being thermally connected to the other third surface 113.

[0341] The technical solution of this application embodiment, through the thermally conductive connection between the third side wall plate 32 and the third surface 113, can better manage the temperature of the battery cell 11, reduce the risk of the battery cell 11 temperature affecting the charging and discharging efficiency, and help improve the reliability of the battery device 1.

[0342] This application also provides an electrical device, including a battery device 1 of any of the above embodiments, the battery device 1 being used to provide electrical energy to the electrical device.

[0343] Please refer to Figure 2 and Figure 4In some embodiments, the battery device 1 includes a battery cell assembly 10, a first housing body 20, and a second housing body 30. The battery cell assembly 10 includes a plurality of battery cells 11 stacked along a first direction X. Each battery cell 11 has a first surface 111 perpendicular to the first direction X, and the first surface 111 is the surface with the largest area of ​​the battery cell 11.

[0344] The first housing body 20 includes a bottom plate 21, a first side wall panel 22, and a second side wall panel 23. The bottom plate 21 has a bearing surface 211 on one side in the second direction Z, which supports the battery cell 11 along the second direction Z. The first side wall panel 22 and the second side wall panel 23 are arranged opposite to each other in the first direction X, and both the first side wall panel 22 and the second side wall panel 23 are connected to the bearing surface 211. The second housing body 30 and the first housing body 20 together define an assembly space 40 for accommodating the battery cell assembly 10. The first side wall panel 22 and the second side wall panel 23 are both connected to the second housing body 30. The second housing body 30 includes a top plate 31 and two third side wall panels 32. The top plate 31 and the bottom plate 21 are arranged opposite to each other in the second direction Z, and the two third side wall panels 32 are arranged opposite to each other in the third direction Y. One end of the third side wall panel 32 in the second direction Z is connected to the top plate 31.

[0345] The bottom plate 21, the top plate 31 and the two third side wall plates 32 are all provided with flow channels 50. The flow channels 50 are used to contain heat exchange medium so that the box 80 is thermally connected to at least two sides of the battery cell assembly 10, and the first direction X, the second direction Z and the third direction Y are perpendicular to each other.

[0346] The technical solution of this application embodiment, compared to setting heat exchange components on the wall panels of a single housing 80, achieves heat exchange for multiple battery cells 11 by setting flow channels 50 inside the bottom plate 21, top plate 31, and two third side wall panels 32. This improves the heat exchange efficiency of the battery cells 11, reduces the risk of the temperature of the battery cells 11 affecting the charging and discharging efficiency, and improves the reliability of the battery device 1. Furthermore, compared to setting additional heat exchange components inside the housing 80, the flow channels 50 are formed inside the wall panels of the housing 80, which improves the space utilization of the housing 80, allowing the housing 80 to accommodate more battery cells 11 and thus increasing the energy density of the battery device 1.

[0347] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: A battery cell assembly includes a plurality of battery cells stacked along a first direction, each battery cell having a first surface perpendicular to the first direction, the first surface being the surface with the largest area of ​​the battery cell; The first housing body includes a bottom plate, a first side wall plate and a second side wall plate. The bottom plate has a bearing surface on one side in a second direction. The bearing surface is used to support the battery cell along the second direction. The first side wall plate and the second side wall plate are arranged opposite to each other along the first direction. Both the first side wall plate and the second side wall plate are connected to the bearing surface. as well as The second housing body, together with the first housing body, defines an assembly space for accommodating the battery cell assembly. The first side wall panel and the second side wall panel are both connected to the second housing body. The second housing body includes a top plate and two third side wall panels. The top plate and the bottom plate are arranged opposite to each other along the second direction. The two third side wall panels are arranged opposite to each other along the third direction. One end of the third side wall panel in the second direction is connected to the top plate. The bottom plate, the top plate, and at least two of the two third sidewalls are provided with flow channels inside. The flow channels are used to contain heat exchange medium for thermally connecting with at least two sides of the battery cell assembly. The first direction, the second direction, and the third direction are perpendicular to each other.

2. The battery device according to claim 1, characterized in that, The flow channels are provided inside at least three of the bottom plate, the top plate, and the two second side wall plates.

3. The battery device according to claim 1, characterized in that, The flow channels are provided inside the bottom plate, the top plate, and the two second side wall plates.

4. The battery device according to claim 1, characterized in that, The first box body also includes two fourth side wall panels, which are arranged opposite each other along the third direction. The fourth side wall panels are connected to the bottom plate and protrude from the bearing surface. The fourth side wall panels are connected to the third side wall panel.

5. The battery device according to claim 4, characterized in that, Along the second direction, the fourth sidewall protrudes from the bearing surface by a dimension less than one-quarter of the maximum dimension of the third sidewall.

6. The battery device according to any one of claims 1-5, characterized in that, The base plate has a first flow channel formed inside for accommodating the heat exchange medium, and the base plate is configured to manage the temperature of at least two of the battery cells in the battery cell assembly.

7. The battery device according to claim 6, characterized in that, The first box body also includes a first expansion beam, which is connected to the bearing surface, and one end of the battery cell assembly in the first direction abuts against the first expansion beam.

8. The battery device according to claim 7, characterized in that, Along the first direction, the first sidewall panel, the first expansion beam, the battery cell assembly, and the second sidewall panel are arranged in sequence; The base plate is provided with a first medium inlet and a first medium outlet that communicate with the first flow channel. The first medium inlet and the first medium outlet are both located between the first expansion beam and the first side wall plate.

9. The battery device according to claim 8, characterized in that, The battery device further includes a first connector and a second connector, the first connector and the second connector being respectively disposed on the first side wall plate; The battery device further includes a first connecting pipe and a second connecting pipe, both of which are located between the first expansion beam and the first side wall plate. The first connecting pipe connects the first medium inlet and the first connector, and the second connecting pipe connects the first medium outlet and the second connector.

10. The battery device according to claim 7, characterized in that, The first box body also includes a second expansion beam, which is connected to the bottom plate and is disposed opposite to the first expansion beam along the first direction. The two ends of the battery cell assembly abut against the first expansion beam and the second expansion beam, respectively.

11. The battery device according to claim 10, characterized in that, The number of battery cell modules is multiple, and the multiple battery cell modules are arranged along the third direction; The first box body also includes a partition plate, which is disposed between two adjacent battery cell assemblies. In the first direction, the two ends of the partition plate are respectively connected to the first expansion beam and the second expansion beam.

12. The battery device according to claim 11, characterized in that, The partition plate has a second flow channel formed inside for accommodating the heat exchange medium, and the partition plate is configured to manage the temperature of at least two of the battery cells in the battery cell assembly.

13. The battery device according to any one of claims 11-12, characterized in that, Along the first direction, the base plate includes a first sub-base plate, a second sub-base plate, and a third sub-base plate arranged in sequence. The first sub-base plate is connected to the first expansion beam and the first side wall plate. The bearing surface is disposed on the second sub-base plate. The first flow channel is formed inside the second sub-base plate. The third sub-base plate is connected to the second expansion beam and the second side wall plate. The partition plate is connected to the second sub-base plate.

14. The battery device according to claim 13, characterized in that, The second sub-base plate includes a first part, a second part, and a third part arranged along the second direction. The second part is integrally formed with the partition plate, and the first part and the third part are connected through the second part.

15. The battery device according to claim 12, characterized in that, The first expansion beam is provided with a first through hole, the through hole penetrates the first expansion beam along the first direction, and the partition plate passes through the first through hole; The partition plate is provided with a second medium inlet and a second medium outlet that communicate with the second flow channel. Both the second medium outlet and the second medium inlet are located between the first expansion beam and the first side wall plate.

16. The battery device according to claim 11, characterized in that, The partition plate has a connecting block at one end away from the first expansion beam, and the second expansion beam has a groove on the side facing the first expansion beam. At least a portion of the connecting block is embedded in the groove to prevent the partition plate from detaching from the second expansion beam.

17. The battery device according to any one of claims 1-5, 7-12, and 14-16, characterized in that, The top plate has a third flow channel formed inside it for containing the heat exchange medium, and the top plate is configured to manage the temperature of at least two of the battery cells in the battery cell assembly.

18. The battery device according to any one of claims 1-5, 7-12, and 14-16, characterized in that, The interior of the third sidewall is formed with a fourth flow channel for containing the heat exchange medium, and the third sidewall is configured to manage the temperature of at least two of the battery cells in the battery cell assembly.

19. The battery device according to claim 18, characterized in that, The third side wall panel and the top panel are integrally formed.

20. The battery device according to claim 19, characterized in that, The top plate has a third flow channel for containing the heat exchange medium inside. The third flow channel and the fourth flow channel are interconnected. One of the third sidewalls is provided with a third medium inlet that communicates with the fourth flow channel, and the other of the third sidewalls is provided with a third medium outlet that communicates with the fourth flow channel.

21. The battery device according to claim 18, characterized in that, A battery cell assembly is disposed between the two third sidewalls. One third sidewall is thermally connected to the battery cell assembly on the third-direction side, and the other third sidewall is thermally connected to the battery cell assembly on the other side of the third-direction side.

22. The battery device according to claim 18, characterized in that, A plurality of battery cell assemblies are disposed between the two third sidewalls, and the plurality of battery cell assemblies are arranged along the third direction; The first housing body also includes a partition plate disposed between two adjacent battery cell assemblies. The partition plate has a second flow channel formed inside it for accommodating the heat exchange medium. The partition plate is configured to manage the temperature of at least two of the battery cells in the battery cell assembly.

23. The battery device according to claim 1, characterized in that, The outer surface of the battery cell is covered with a thermally conductive component, which includes a first thermally conductive part and a second thermally conductive part connected to each other. The first thermally conductive part is thermally connected to the first surface, and the second thermally conductive part is thermally connected to at least one of the bottom plate, the top plate, and the two third sidewalls.

24. The battery device according to claim 23, characterized in that, The battery cell includes electrode terminals, which are located on the side of the battery cell facing the top plate; The second heat-conducting part is thermally connected to the bottom plate and the two third side wall plates.

25. The battery device according to any one of claims 23-24, characterized in that, The material of the heat-conducting component includes at least one of graphene, carbon nanotubes, and silicene.

26. The battery device according to claim 1, characterized in that, In the second direction, the battery cell has a second surface facing the top plate, and the battery cell includes electrode terminals disposed on the second surface; The top plate has a third flow channel inside for containing the heat exchange medium, and the top plate is thermally connected to the second surface.

27. The battery device according to claim 1, characterized in that, In the second direction, the battery cell has a second surface facing the top plate, and the battery cell includes electrode terminals disposed on the second surface; The battery cell assembly also includes a busbar component, which is electrically connected to the electrode terminals of multiple battery cells. A third flow channel for accommodating the heat exchange medium is formed inside the top plate, and the top plate is thermally connected to the busbar component.

28. The battery device according to claim 1, characterized in that, In the third direction, the battery cell has a third surface facing the third sidewall panel, and the battery cell includes electrode terminals disposed on the third surface; The interior of the third sidewall has a fourth flow channel for containing the heat exchange medium, and the third sidewall is thermally connected to the third surface.

29. An electrical appliance, characterized in that, The battery device includes any one of claims 1-28, the battery device being used to provide electrical energy to the electrical device.

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