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 first box body comprises a bottom plate and a first side wall plate connected to the bottom plate and protruding from a bearing surface. The second box body cooperates with the first box body to define an assembly space for accommodating the battery cell assembly. The second box body comprises a top plate and a second side wall plate connected to the first side wall plate. The second side wall plate is connected to the top plate at an end thereof away from the bottom plate in a second direction. The protruding dimension of the first side wall plate from the bearing surface is less than one fourth of the maximum dimension of the second side wall plate. The second side wall plate is thermally connected to one side of the battery cell assembly in a third direction. The second side wall plate has a first flow channel formed in the interior thereof. The second side wall plate is configured to manage the temperature of at least two battery cells in the battery cell assembly. The technical solution 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. Utility Model Content

[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. The battery device includes a battery cell assembly, a first housing body, and a second housing body. The battery cell assembly includes a plurality of battery cells arranged 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 base plate and a first side wall plate. The base plate has a bearing surface on one side in a second direction, the bearing surface being used to support the battery cells along the second direction. The first side wall plate is connected to the base plate and protrudes from the bearing surface. The second housing body, together with the first housing body, defines an assembly space for accommodating the battery cell assembly. The second housing body includes a top plate and a second side wall plate, the top plate and the base plate being disposed opposite each other along the second direction. The second side wall plate is connected to the first side wall plate, and the end of the second side wall plate away from the base plate in the second direction is connected to the top plate. Along the second direction, the dimension of the first side wall plate protruding from the bearing surface is less than one-quarter of the maximum dimension of the second side wall plate. The second sidewall is thermally connected to the battery cell assembly on the third direction side. A first flow channel is formed inside the second sidewall for containing a heat exchange medium. The second sidewall is configured to manage the temperature of at least two battery cells in the battery cell assembly, with the first direction, second direction and third direction being perpendicular to each other.

[0007] The technical solution of this application embodiment defines an assembly space for accommodating battery cell components by jointly defining the first box body and the second box body, which helps reduce the risk of damage to the battery cell components and thus improves the reliability of the battery device. Simultaneously, the first side wall panel connects to the second side wall panel, thereby improving the convenience of connecting the first box body and the second box body.

[0008] Since the first housing body is used to carry the battery cell assembly, it requires high structural strength and has a high cost. By setting the size of the first side wall plate protruding from the bearing surface to be less than one-quarter of the maximum size of the second side wall plate, the size of the first side wall plate used for assembly and connection with the second housing body is smaller, which helps to reduce the cost of the first housing body. At the same time, the size of the second side wall plate used for assembly and connection with the first housing body is larger, which allows the second side wall plate to limit the battery cell assembly in the third direction, which helps to improve the reliability of the second housing body in accommodating the battery cell assembly, thereby improving the reliability of the battery device.

[0009] Meanwhile, by setting a first flow channel inside the second side wall panel, the second side wall panel can exchange heat with the battery cell assembly in the third direction, which is beneficial for managing the temperature of the battery cell assembly and improving the reliability of the battery device.

[0010] In some embodiments, there are two first sidewall panels, which are arranged opposite each other along a third direction. There are also two second sidewall panels, which are arranged opposite each other along a third direction, with one second sidewall panel connected to one first sidewall panel and the other second sidewall panel connected to the other first sidewall panel.

[0011] The technical solution of this application embodiment improves the reliability of the connection between the first box body and the second box body by setting two first side wall panels and two second side wall panels to be connected accordingly.

[0012] In some embodiments, the top plate is thermally connected to one side of the battery cell assembly in a second direction, and a second flow channel is formed inside the top plate for containing a heat exchange medium. The top plate is configured to manage the temperature of at least two battery cells in the battery cell assembly.

[0013] The technical solution of this application embodiment achieves heat exchange between the top plate and the battery cell assembly by forming a second flow channel inside the top plate to accommodate the heat exchange medium, which helps to improve the reliability of the battery device.

[0014] In some embodiments, the top panel and the second side panel are integrally formed.

[0015] The technical solution of this application embodiment is that the second side wall panel and the top plate are integrally formed, which facilitates the processing of the second box body.

[0016] In some embodiments, there are two second sidewall panels, which are connected to the two ends of the top plate in a third direction. The first flow channel and the second flow channel of the two second sidewall panels are interconnected. One second sidewall panel is provided with a first medium inlet communicating with the first flow channel, and the other second sidewall panel is provided with a first medium outlet communicating with the first flow channel.

[0017] The technical solution of this application embodiment, by setting a first medium inlet on one second side wall and a first medium outlet on another second side wall, realizes the circulation of heat exchange medium in the first flow channel and the second flow channel, which is beneficial for the second side wall and the top plate to manage the temperature of the battery cell assembly, thereby improving the reliability of the battery device.

[0018] In some embodiments, a battery cell assembly is disposed between the two second sidewalls, one second sidewall is thermally connected to the third-upward side of the battery cell assembly, and the other second sidewall is thermally connected to the third-upward side of the battery cell assembly.

[0019] The technical solution of this application embodiment, through a second sidewall plate thermally connected to the battery cell assembly on one side in the third direction and another second sidewall plate thermally connected to the battery cell assembly on the other side in the third direction, 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.

[0020] In some embodiments, a plurality of battery cell assemblies are disposed between two second sidewall panels, and the plurality of battery cell assemblies are arranged along a second direction. The first housing body also includes a partition plate disposed between two adjacent battery cell assemblies, the partition plate having a third flow channel formed inside for accommodating a heat exchange medium, and the partition plate being configured to manage the temperature of at least two battery cells in the battery cell assembly.

[0021] The technical solution of this application embodiment, through the joint thermal connection of two second sidewall plates and a partition plate with the battery cell assembly, 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.

[0022] In some embodiments, the base plate is thermally connected to one side of the battery cell assembly in a second direction, and a fourth flow channel is formed inside the base plate for containing a heat exchange medium. The base plate is configured to manage the temperature of at least two battery cells in the battery cell assembly.

[0023] The technical solution of this application embodiment achieves heat exchange between the base plate and the battery cell assembly by forming a fourth flow channel inside the base plate to accommodate the heat exchange medium, which helps to improve the reliability of the battery device.

[0024] In some embodiments, the first box body further includes a third side wall panel and a fourth side wall panel, which are arranged opposite to each other along a first direction. Both the third side wall panel and the fourth side wall panel are connected to the bearing surface and are connected to the second box body.

[0025] The technical solution of this application embodiment connects the second box body through the third side wall plate and the fourth side wall plate of the first box body, so as to realize the mutual connection between the two sides of the first box body and the second box body in the first direction, thereby realizing the assembly connection between the first box body and the second box body and jointly defining the assembly space for accommodating the battery cell. The structure is simple and easy to assemble.

[0026] 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 a first direction abuts against the first expansion beam.

[0027] 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.

[0028] In some embodiments, along a first direction, a third sidewall panel, a first expansion beam, a battery cell assembly, and a fourth sidewall panel are arranged sequentially. A second medium inlet and a second medium outlet, communicating with the fourth flow channel, are provided on the bottom plate, both located between the first expansion beam and the third sidewall panel.

[0029] The technical solution of this application embodiment sets the second medium inlet and the second medium outlet between the first expansion beam and the third side wall plate, which reduces the risk of interference between the second medium inlet and the second medium outlet and the battery cell assembly, and helps to improve the reliability of the battery device.

[0030] In some embodiments, the battery device further includes a first connector and a second connector, which are respectively disposed on the third 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 third side wall plate. The first connecting pipe connects the second medium inlet and the first connector, and the second connecting pipe connects the second medium outlet and the second connector.

[0031] The technical solution of this application embodiment connects the second medium inlet and the first connector via a first connecting pipe, and the second connecting pipe connects the second medium outlet and the second connector, thereby realizing the circulation of the heat exchange medium in the fourth 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 third 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.

[0032] In some embodiments, the first housing body further includes a second expansion beam, which is connected to the bearing surface and is disposed opposite to the first expansion beam along a first direction, and the two ends of the battery cell assembly abut against the first expansion beam and the second expansion beam, respectively.

[0033] 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.

[0034] In some embodiments, the number of battery cell assemblies is multiple, and the multiple battery cell assemblies are arranged along a second 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 a first expansion beam and a second expansion beam.

[0035] 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 against the expansion beams of the battery cells.

[0036] In some embodiments, along a 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 a first expansion beam and a third sidewall plate. A bearing surface is disposed on the second sub-base plate, and a fourth flow channel is formed inside the second sub-base plate. The third sub-base plate is connected to the second expansion beam and the fourth sidewall plate. A partition plate is connected to the second sub-base plate.

[0037] The technical solution of this application embodiment connects the first sub-base plate to the first expansion beam and the third side wall plate, the third sub-base plate to the second expansion beam and the fourth 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 third side wall plate, the second expansion beam and the fourth side wall plate to the base plate.

[0038] In some embodiments, the second sub-base plate includes a first portion, a second portion, and a third portion arranged along a third direction, the second portion being integrally formed with a partition plate, and the first portion and the third portion being connected through the second portion.

[0039] 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.

[0040] In some embodiments, the first expansion beam is provided with a through hole that extends through the first expansion beam along a first direction, and a partition plate passes through the through hole. The partition plate has a third flow channel formed inside for containing heat exchange medium, and a third medium inlet and a third medium outlet communicating with the third flow channel are provided on the partition plate. The third medium outlet and the third medium inlet are both located on the side of the first expansion beam away from the battery cell assembly.

[0041] The technical solution of this application embodiment, by providing a through hole in the first expansion beam and having a separator plate pass through the through hole, facilitates the connection between the separator plate and the first expansion beam, thereby improving the reliability of the connection between the separator plate and the first expansion beam. Simultaneously, the separator plate passing through the through hole ensures that the third medium inlet and the third 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 third medium inlet and the third medium outlet and the battery cell assembly, thus improving the reliability of the battery device.

[0042] In some embodiments, a connecting block is provided at the end of the partition plate away from the first expansion beam, and a first 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 first groove to restrict the partition plate from detaching from the second expansion beam.

[0043] 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.

[0044] In some embodiments, the outer surface of the battery cell is covered with a thermally conductive element, which includes a first thermally conductive portion and a second thermally conductive portion connected to each other. The first thermally conductive portion is thermally connected to a first surface, and the second thermally conductive portion is thermally connected to a second sidewall plate. And / or a fourth flow channel is formed inside the bottom plate, which is used to contain a heat exchange medium, and the second thermally conductive portion is thermally connected to the bottom plate.

[0045] The technical solution of this application embodiment, by setting a heat-conducting component, makes the first heat-conducting part heat-conductingly connected to the first surface, and the second heat-conducting part heat-conductingly connected to the second side wall plate and / or the bottom plate, thereby regulating 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.

[0046] In some embodiments, the material of the thermal conductive element includes at least one of graphene, carbon nanotubes, and silicene.

[0047] 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.

[0048] In some embodiments, a second flow channel is formed inside the top plate for containing a heat exchange medium. In a second direction, the battery cell has a second surface facing the top plate. The battery cell includes electrode terminals disposed on the second surface, and the top plate is thermally connected to the second surface.

[0049] 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.

[0050] In some embodiments, a second flow channel is formed inside the top plate for containing a heat exchange medium. In a second direction, each battery cell has a second surface facing the top plate, and each battery cell includes electrode terminals disposed on the second surface. The battery cell assembly also includes a busbar component electrically connected to the electrode terminals of a plurality of battery cells, and the top plate is thermally connected to the busbar component.

[0051] 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.

[0052] In some embodiments, in the third-party orientation, the battery cell has a third surface facing the second sidewall, the battery cell includes electrode terminals disposed on the third surface, and the second sidewall is thermally connected to the third surface.

[0053] The technical solution of this application embodiment, through the thermally conductive connection between the second 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.

[0054] 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.

[0055] 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

[0056] 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.

[0057] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0058] Figure 2 This is an exploded view of the structure of a battery device provided in some embodiments of this application;

[0059] Figure 3 This is an exploded view of the structure of a battery cell provided in some embodiments of this application;

[0060] Figure 4 Schematic diagram of a battery device provided for some embodiments of this application;

[0061] Figure 5 A schematic diagram of a battery device from another perspective, provided for some embodiments of this application;

[0062] Figure 6 This is an exploded view of the structure of a battery device provided in other embodiments of this application;

[0063] Figure 7 This is a schematic diagram of the internal structure of a battery device provided in other embodiments of this application;

[0064] Figure 8 Structural schematic diagrams of the first expansion beam and the third sidewall plate provided for some embodiments of this application;

[0065] Figure 9 This is a schematic diagram of the structure of the base plate and the partition plate provided in some embodiments of this application;

[0066] Figure 10 for Figure 9 Enlarged view of point B in the middle;

[0067] Figure 11 for Figure 9 Enlarged view of point C in the middle;

[0068] 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;

[0069] Figure 13 This is a schematic diagram of the structure of a heat-conducting component provided in some embodiments of this application;

[0070] Figure 14 This is an exploded view of the structure of a battery device provided in some embodiments of this application.

[0071] 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-Box; 21-First box body; 211-Base plate; 2111-Bearing surface; 2112-Fourth flow channel; 2113-Second medium inlet; 2114-Second medium outlet; 2115-First sub-base plate; 2116-Second sub-base plate; 21161-First part; 21162-Second part; 21163-Third part; 2117-Third sub-base plate; 212-First side wall plate; 213-Separator plate; 2131-Third flow channel; 2132-First... 2133 - Third medium outlet; 2134 - Connecting block; 214 - Third side wall plate; 2141 - First connector; 2142 - Second connector; 215 - Fourth side wall plate; 216 - First expansion beam; 2161 - Through hole; 217 - Second expansion beam; 2171 - First groove; 22 - Second box body; 221 - Top plate; 2211 - Second flow channel; 222 - Second side wall plate; 2221 - First flow channel; 2222 - First medium inlet; 2223 - First medium outlet; 30 - Assembly space; 40 - First connecting pipe; 50 - Second connecting pipe; 60 - Heat-conducting component; 61 - First heat-conducting part; 62 - Second heat-conducting part; 100 - Vehicle; 110 - Controller; 120 - Motor; X - First direction; Z - Second direction; Y - Third direction. Detailed Implementation

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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).

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.).

[0093] 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.

[0094] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0102] In some implementations, the electrode assembly is a stacked structure.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] Typically, a battery assembly includes a housing and multiple battery cells disposed within the housing, with the battery cells arranged along the length of the housing. The housing includes a first housing body and a second housing body, which are interconnected to form an assembly space for accommodating the battery cells. The first housing body is used to support the battery cells.

[0112] Since the first housing is used to support the individual battery cells, it requires high structural strength, resulting in high cost. Therefore, to reduce the cost of the first housing, the height of the side walls in the width direction of the housing is usually set to be relatively small, thus saving costs.

[0113] However, by setting the height of the side wall of the first box body in the width direction to be relatively small, the box body has poor limiting effect on the battery cells in the width direction, which affects the reliability of the box body in accommodating the battery cells. At the same time, the battery device cannot exchange heat with the battery cells in the width direction, which poses a risk that temperature affects the reliability of the battery cells.

[0114] Based on the above considerations, in order to solve the problems of poor reliability of the battery cell housing and the impact of temperature on the reliability of the battery cells, 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 a plurality of battery cells arranged 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 and a first side wall plate. The bottom plate has a bearing surface on one side in a second direction, which is used to support the battery cells along the second direction. The first side wall plate is connected to the bottom plate and protrudes from the bearing surface. The second housing body and the first housing body together define an assembly space for housing the battery cell assembly. The second housing body includes a top plate and a second side wall plate. The top plate and the bottom plate are arranged opposite to each other in the second direction. The second side wall plate is connected to the first side wall plate, and the end of the second side wall plate away from the bottom plate in the second direction is connected to the top plate. Along the second direction, the dimension of the first side wall plate protruding from the bearing surface is less than one-quarter of the maximum dimension of the second side wall plate. The second sidewall is thermally connected to the battery cell assembly on the third direction side. A first flow channel is formed inside the second sidewall for containing a heat exchange medium. The second sidewall is configured to manage the temperature of at least two battery cells in the battery cell assembly, with the first direction, second direction and third direction being perpendicular to each other.

[0115] The technical solution of this application embodiment defines an assembly space for accommodating battery cell components by jointly defining the first box body and the second box body, which helps reduce the risk of damage to the battery cell components and thus improves the reliability of the battery device. Simultaneously, the first side wall panel connects to the second side wall panel, thereby improving the convenience of connecting the first box body and the second box body.

[0116] Since the first housing body is used to carry the battery cell assembly, it requires high structural strength and has a high cost. By setting the size of the first side wall plate protruding from the bearing surface to be less than one-quarter of the maximum size of the second side wall plate, the size of the first side wall plate used for assembly and connection with the second housing body is smaller, which helps to reduce the cost of the first housing body. At the same time, the size of the second side wall plate used for assembly and connection with the first housing body is larger, which allows the second side wall plate to limit the battery cell assembly in the third direction, which helps to improve the reliability of the second housing body in accommodating the battery cell assembly, thereby improving the reliability of the battery device.

[0117] Meanwhile, by setting a first flow channel inside the second side wall panel, the second side wall panel can exchange heat with the battery cell assembly in the third direction, which is beneficial for managing the temperature of the battery cell assembly and improving the reliability of the battery device.

[0118] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery devices.

[0119] 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.

[0120] 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.

[0121] Please refer to Figure 1 , Figure 1 This 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.

[0122] 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.

[0123] 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.

[0124] 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.

[0125] 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 20 and a battery cell 11, with the battery cell 11 housed within the housing 20.

[0126] The housing 20 provides a space for accommodating the battery cell 11, and the housing 20 can adopt various structures. In some embodiments, the housing 20 may include a first housing body 21 and a second housing body 22, which overlap each other, and together define an assembly space 30 for accommodating the battery cell 11. The second housing body 22 covers the first housing body 21, so that the first housing body 21 and the second housing body 22 together define the assembly space 30.

[0127] 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 20. 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 20. 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.

[0128] 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.

[0129] 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.

[0130] 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.

[0131] Please refer to Figure 2 and Figure 4 , Figure 4This is a schematic diagram of a battery device provided in some embodiments of this application. Embodiments of this application provide a battery device 1. The battery device 1 includes a battery cell assembly 10, a first housing body 21, and a second housing body 22. The battery cell assembly 10 includes a plurality of battery cells 11 arranged 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 21 includes a base plate 211 and a first side wall plate 212. The base plate 211 has a bearing surface 2111 on one side in the second direction Z, which supports the battery cells 11 along the second direction Z. The first side wall plate 212 is connected to the base plate 211 and protrudes from the bearing surface 2111. The second housing body 22 and the first housing body 21 together define an assembly space 30 for accommodating the battery cell assembly 10. The second housing body 22 includes a top plate 221 and a second side wall plate 222. The top plate 221 and the bottom plate 211 are arranged opposite each other along the second direction Z. The second side wall plate 222 is connected to the first side wall plate 212, and the end of the second side wall plate 222 away from the bottom plate 211 in the second direction Z is connected to the top plate 221. Along the second direction Z, the size of the first side wall plate 212 protruding from the bearing surface 2111 is less than one-quarter of the maximum size of the second side wall plate 222. The second side wall plate 222 is thermally connected to one side of the battery cell assembly 10 in the third direction Y. A first flow channel 2221 is formed inside the second side wall plate 222 for accommodating a heat exchange medium. The second side wall plate 222 is configured to manage the temperature of at least two battery cells 11 in the battery cell assembly 10. The first direction X, the second direction Z, and the third direction Y are perpendicular to each other.

[0132] 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.

[0133] In some embodiments, the first direction X may be parallel to the length direction of the battery device 1, the third direction Y may be parallel to the width direction of the battery device 1, and the second direction Z may be parallel to the height direction of the battery device 1.

[0134] In some embodiments, the first direction X, the third direction Y, and the second direction Z can be perpendicular to each other.

[0135] 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.

[0136] In some embodiments, the first box body 21 and the second box body 22 can be made of various materials. The first box body 21 and the second box body 22 can be made of non-metallic materials, such as polymer composite materials. Of course, the first box body 21 and the second box body 22 can also be made of metallic materials, such as aluminum, aluminum alloy, or steel. Similarly, the materials of the first box body 21 and the second box body 22 can be the same or different.

[0137] In some embodiments, the housing 20 of the battery device 1 may include a first housing body 21 and a second housing body 22. The bottom plate 211 of the first housing body 21 is used to support the battery cell assembly 10. That is, the first housing body 21 may be the lower part of the housing 20, and the second housing body 22 may be the upper part of the housing 20.

[0138] In some embodiments, the first housing body 21 includes a base plate 211, which has a bearing surface 2111 on one side in the second direction Z. The thickness direction of the base plate 211 can be parallel to the second direction Z, that is, the thickness direction of the base plate 211 can be parallel to the direction of gravity. The bearing surface 2111 can be the surface of the base plate 211 facing the battery cell assembly 10.

[0139] In some embodiments, the battery cell assembly 10 is disposed on a base plate 211 along the second direction Z, and the base plate 211 is disposed at the bottom of the battery cell assembly 10, so that the bottom can support the battery cell assembly 10.

[0140] In some embodiments, two first sidewall panels 212 are disposed opposite each other along a third direction Y. In a second direction Z, one end of the first sidewall panel 212 is connected to the base plate 211, and the other end is connected to the second sidewall panel 222. One second sidewall panel 222 is connected to one first sidewall panel 212, and the other second sidewall panel 222 is connected to the other first sidewall panel 212.

[0141] In some embodiments, the first sidewall panel 212 is connected to the bottom plate 211 and protrudes from the bearing surface 2111. That is, the first sidewall panel 212 of the first box body 21 is connected to the bottom plate 211 and extends beyond the bearing surface 2111 of the bottom plate 211 in the second direction Z along the direction from the bottom plate 211 to the battery cell assembly 10.

[0142] In some embodiments, the two first sidewall panels 212 may be arranged opposite each other along the third direction Y, wherein the two first sidewall panels 212 may be arranged at both ends of the bottom plate 211 in the third direction Y, and the two first sidewall panels 212 may be two side beams opposite each other of the box body 20 in the third direction Y, that is, the two first sidewall panels 212 may be the two outermost components of the box body 20 in the third direction Y.

[0143] In some embodiments, the first side wall panel 212 and the bottom plate 211 can be separate structures, with one end of the bottom plate 211 connected to the first side wall panel 212 in the third direction Y, and the first side wall panel 212 protruding along the second direction Z from the bearing surface 2111 of the bottom plate 211 facing the assembly space 30.

[0144] In some embodiments, the top plate 221 is connected to two second side wall panels 222. The two second side wall panels 222 can be arranged opposite each other along a third direction Y, wherein the two second side wall panels 222 can be disposed at both ends of the top plate 221 in the third direction Y, and the two second side wall panels 222 can be two opposite side beams of the box body 20 in the third direction Y, that is, the two second side wall panels 222 can be the two outermost components of the box body 20 in the third direction Y.

[0145] In some embodiments, the second sidewall panel 222 may extend along the second direction Z. In the second direction Z, one end of the second sidewall panel 222 is connected to the top plate 221, and the other end is connected to the first box body 21, such as the first sidewall panel 212 connected to the first box body 21.

[0146] In some embodiments, with the second direction Z as the projection direction, the orthographic projection of the second sidewall panel 222 can overlap with the orthographic projection of the first sidewall panel 212.

[0147] In some embodiments, with the second direction Z as the projection direction, the orthographic projection of the second sidewall panel 222 can completely overlap with the orthographic projection of the first sidewall panel 212.

[0148] It should be noted that among the multiple side wall panels of the first box body 21, the side wall panel whose size protruding from the bearing surface 2111 is less than one-quarter of the maximum size of the second side wall panel 222 is the first side wall panel 212. The first box body 21 may include other side wall panels, and the size of the other side wall panels protruding from the bearing surface 2111 may be greater than one-quarter of the maximum size of the second side wall panel 222.

[0149] In some embodiments, the second sidewall panel 222 may be a solid plate, and the first flow channel 2221 may be formed by machining or integral extrusion.

[0150] In some embodiments, the second sidewall panel 222 may be composed of multiple plates connected to form the second sidewall panel 222, and a first flow channel 2221 may be formed inside the second sidewall panel 222.

[0151] In some embodiments, the battery cell 11 may have a side in the third direction Y, and the second sidewall 222 may contact the side of at least two battery cells 11 of a battery cell assembly 10. Alternatively, the second sidewall 222 may contact the side of all battery cells 11 of a battery cell assembly 10.

[0152] In some embodiments, the heat exchange medium may be a cooling medium, such as a coolant, used to cool the battery cell assembly 10.

[0153] In some embodiments, the heat exchange medium can be a medium with a higher temperature, used to heat up the battery cell assembly 10.

[0154] In some embodiments, thermally conductive adhesive may be provided between the second sidewall panel 222 and the battery cell assembly 10 to improve the thermal conductivity between the second sidewall panel 222 and the battery cell assembly 10.

[0155] The technical solution of this application embodiment defines an assembly space 30 for accommodating the battery cell assembly 10 by jointly defining the first box body 21 and the second box body 22. This helps reduce the risk of damage to the battery cell assembly 10, thereby improving the reliability of the battery device 1. Simultaneously, the first side wall plate 212 connects to the second side wall plate 222, thereby improving the convenience of connecting the first box body 21 and the second box body 22.

[0156] Since the first housing body 21 is used to support the battery cell assembly 10, it requires high structural strength and has a high cost. By setting the size of the first side wall plate 212 protruding from the bearing surface 2111 to be less than one-quarter of the maximum size of the second side wall plate 222, the size of the first side wall plate 212 used for assembly and connection with the second housing body 22 is smaller, which helps to reduce the cost of the first housing body 21. At the same time, the size of the second side wall plate 222 used for assembly and connection with the first housing body 21 is larger, which allows the second side wall plate 222 to limit the battery cell assembly 10 in the third direction Y, which helps to improve the reliability of the second housing body 22 in accommodating the battery cell assembly 10, thereby improving the reliability of the battery device 1.

[0157] Meanwhile, by setting a first flow channel 2221 inside the second side wall panel 222, the second side wall panel 222 can exchange heat with the battery cell assembly 10 in the third direction Y, which is beneficial to managing the temperature of the battery cell assembly 10 and improving the reliability of the battery device 1.

[0158] Please refer to Figure 2 and Figure 4 In some embodiments, there are two first sidewall panels 212, which are arranged opposite each other along a third direction Y. There are also two second sidewall panels 222, which are arranged opposite each other along a third direction Y. One second sidewall panel 222 is connected to one first sidewall panel 212, and the other second sidewall panel 222 is connected to the other first sidewall panel 212.

[0159] In some embodiments, taking one battery cell assembly 10 as an example, the battery cell assembly 10 has two opposing sides in the third direction Y. In the third direction Y, one second sidewall 222 can be thermally connected to one side of the battery cell assembly 10 in the third direction Y, and another second sidewall 222 can be thermally connected to the other side of the battery cell assembly 10 in the third direction Y.

[0160] In some embodiments, taking two battery cell assemblies 10 as an example, one side of the battery cell assembly 10 in the third direction Y can be disposed opposite to the other side of the battery cell assembly 10 in the third direction Y. In the third direction Y, one second sidewall 222 can be thermally connected to the side of one battery cell assembly 10 in the third direction Y, and the other second sidewall 222 can be thermally connected to the other side of the battery cell assembly 10 in the third direction Y.

[0161] The technical solution of this application embodiment improves the reliability of the connection between the first box body 21 and the second box body 22 by setting two first side wall panels 212 and two second side wall panels 222 to be connected accordingly.

[0162] Please refer to Figure 2 and Figure 4 In some embodiments, the top plate 221 is thermally connected to one side of the battery cell assembly 10 in the second direction Z, and a second flow channel 2211 is formed inside the top plate 221 for containing a heat exchange medium. The top plate 221 is configured to manage the temperature of at least two battery cells 11 in the battery cell assembly 10.

[0163] In some embodiments, the top plate 221 may be a solid plate, and the second flow channel 2211 may be formed by machining or integral extrusion.

[0164] In some embodiments, the top plate 221 may be composed of multiple plates connected to form the top plate 221, and a second flow channel 2211 may be formed inside the top plate 221.

[0165] In some embodiments, the battery cell 11 may have a top surface in the second direction Z, and the top plate 221 may contact the top surfaces of at least two battery cells 11 of a battery cell assembly 10. Alternatively, the top plate 221 may contact the top surfaces of all battery cells 11 of a battery cell assembly 10.

[0166] The technical solution of this application embodiment achieves heat exchange between the top plate 221 and the battery cell assembly 10 by forming a second flow channel 2211 inside the top plate 221 for accommodating the heat exchange medium, which helps to improve the reliability of the battery device 1.

[0167] Please refer to Figure 2 and Figure 4 In some embodiments, the top plate 221 and the second side wall plate 222 are integrally formed.

[0168] In some embodiments, the second sidewall panel 222 and the top plate 221 can be integrally formed, for example, the second sidewall panel 222 and the top plate 221 can be integrally cast, or the second sidewall panel 222 and the top plate 221 can be integrally extruded.

[0169] The technical solution of this application embodiment is that the second side wall panel 222 and the top plate 221 are integrally formed, which facilitates the processing of the second box body 22.

[0170] Please refer to Figure 2 and Figure 4 and refer to Figure 5 , Figure 5 This is a schematic diagram of a battery device from another perspective, provided for some embodiments of this application. In some embodiments, there are two second sidewall panels 222, which are connected to the two ends of the top plate 221 in the third direction Y. The first flow channel 2221 and the second flow channel 2211 of the two second sidewall panels 222 are interconnected. One second sidewall panel 222 is provided with a first medium inlet 2222 communicating with the first flow channel 2221, and the other second sidewall panel 222 is provided with a first medium outlet 2223 communicating with the first flow channel 2221.

[0171] In some embodiments, two second sidewalls 222 are respectively connected to the two ends of the top plate 221 in the third direction Y. One of the first flow channels 2221 is connected to the end of the second flow channel 2211 in the third direction Y at the end opposite to the bottom plate 211 in the second direction Z. The other first flow channel 2221 is connected to the other end of the second flow channel 2211 in the third direction Y at the end opposite to the bottom plate 211 in the second direction Z.

[0172] In some embodiments, a second sidewall panel 222 may be provided with a first medium inlet 2222 communicating with the second flow channel 2211 of the second sidewall panel 222, and another second sidewall panel 222 may be provided with a first medium outlet 2223 communicating with the second flow channel 2211 of the other second sidewall panel 222.

[0173] In some embodiments, the first medium outlet 2223 and the first medium inlet 2222 may be spaced apart along a third direction Y.

[0174] In some embodiments, with the third direction Y as the projection direction, the orthographic projection of the first medium outlet 2223 and the orthographic projection of the first medium inlet 2222 can overlap.

[0175] The technical solution of this application embodiment, by setting a first medium inlet 2222 on one second side wall plate 222 and a first medium outlet 2223 on another second side wall plate 222, realizes the circulation of heat exchange medium in the first flow channel 2221 and the second flow channel 2211, which is beneficial for the second side wall plate 222 and the top plate 221 to manage the temperature of the battery cell assembly 10, thereby improving the reliability of the battery device 1.

[0176] Please refer to Figure 2 and Figure 4 In some embodiments, a battery cell assembly 10 is disposed between the two second sidewalls 222, one second sidewall 222 is thermally connected to one side of the battery cell assembly 10 in the third direction Y, and the other second sidewall 222 is thermally connected to the other side of the battery cell assembly 10 in the third direction Y.

[0177] In some embodiments, the number of battery cell assemblies 10 may be one, which has opposite sides in the third direction Y. A second sidewall 222 is thermally connected to one side of the battery cell 11 in the third direction Y, and another second sidewall 222 is thermally connected to the other side of the battery cell 11 in the third direction Y.

[0178] The technical solution of this application embodiment is to thermally connect one second sidewall plate 222 to one side of the battery cell assembly 10 in the third direction Y, and the other second sidewall plate 222 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.

[0179] Please refer to Figure 6 and Figure 7 , Figure 6 This is an exploded view of the structure of a battery device provided in other embodiments of this application. Figure 7 This is a schematic diagram of the internal structure of a battery device provided in other embodiments of this application. In some embodiments, a plurality of battery cell assemblies 10 are disposed between two second sidewall panels 222, and the plurality of battery cell assemblies 10 are arranged along a second direction Z. The first housing body 21 also includes a partition plate 213, which is disposed between two adjacent battery cell assemblies 10. The partition plate 213 has a third flow channel 2131 formed inside it for accommodating a heat exchange medium. The partition plate 213 is configured to manage the temperature of at least two battery cells 11 in the battery cell assembly 10.

[0180] 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 second sidewall panels 222.

[0181] In some embodiments, the separator 213 is located between two adjacent battery cell assemblies 10, and the separator 213 has two opposing surfaces in the third direction Y.

[0182] Taking two battery cell modules 10 as an example, one battery cell module 10 is thermally connected to a second sidewall 222 on the third-direction Y side, and the other battery cell module 10 is thermally connected to one surface of a separator 213 on the other side of the third-direction Y side. The other battery cell module 10 is thermally connected to another surface of the separator 213 on the third-direction Y side, and the other battery cell module 10 is thermally connected to another second sidewall 222 on the third-direction Y side.

[0183] The technical solution of this application embodiment is thermally connected to the battery cell assembly 10 through two second side wall plates 222 and a partition plate 213, which 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.

[0184] Please refer to Figure 2 , Figure 4 , Figure 6 and Figure 7 In some embodiments, the base plate 211 is thermally connected to one side of the battery cell assembly 10 in the second direction Z, and a fourth flow channel 2112 is formed inside the base plate 211 for containing a heat exchange medium. The base plate 211 is configured to manage the temperature of at least two battery cells 11 in the battery cell assembly 10.

[0185] In some embodiments, the base plate 211 may be thermally connected to the side of the battery cell assembly 10 opposite to the top plate 221 in the second direction Z.

[0186] In some embodiments, the base plate 211 may be a solid plate, and the fourth flow channel 2112 may be formed by machining or integral extrusion.

[0187] In some embodiments, the base plate 211 may be composed of multiple plates connected to form the base plate 211, and a fourth flow channel 2112 may be formed inside the base plate 211.

[0188] In some embodiments, the battery cell 11 may have a bottom surface in the second direction Z, and the base plate 211 may contact the bottom surfaces of at least two battery cells 11. Alternatively, the base plate 211 may contact the bottom surfaces of all battery cells 11.

[0189] The technical solution of this application embodiment achieves heat exchange between the base plate 211 and the battery cell assembly 10 by forming a fourth flow channel 2112 inside the base plate 211 to accommodate the heat exchange medium, which helps to improve the reliability of the battery device 1.

[0190] Please refer to Figure 2 and Figure 6 In some embodiments, the first box body 21 further includes a third side wall panel 214 and a fourth side wall panel 215, which are arranged opposite to each other along the first direction X. The third side wall panel 214 and the fourth side wall panel 215 are both connected to the bearing surface 2111, and the third side wall panel 214 and the fourth side wall panel 215 are both connected to the second box body 22.

[0191] In some embodiments, the first housing body 21 may include a third side wall panel 214 and a fourth side wall panel 215, which may be arranged opposite to each other along a first direction X. In the first direction X, the battery cell assembly 10 may be located between the third side wall panel 214 and the fourth side wall panel 215, and the third side wall panel 214 and the fourth side wall panel 215 may be respectively connected to the two ends of the base plate 211 in the first direction X.

[0192] In the second direction Z, one end of the third side wall panel 214 is connected to the bottom plate 211, and the other end is connected to the top plate 221; one end of the fourth side wall panel 215 is connected to the bottom plate 211, and the other end is connected to the top plate 221. That is, the third side wall panel 214 and the fourth side wall panel 215 can be two opposite side beams of the box body 20 in the first direction X, that is, the third side wall panel 214 and the fourth side wall panel 215 can be the two outermost components of the box body 20 in the first direction X.

[0193] In some embodiments, the third side wall panel 214, the fourth side wall panel 215 and the bottom plate 211 can be a separate structure, with the third side wall panel 214 and the fourth side wall panel 215 protruding along the second direction Z from the bearing surface 2111 of the bottom plate 211 facing the assembly space 30.

[0194] The two second side wall panels 222 of the second box body 22 are respectively connected to the two ends of the top plate 221 in the third direction Y, so that the cross section of the second box body 22 perpendicular to the first direction X is a "U" shaped structure, and the two ends of the second box body 22 in the first direction X are open structures.

[0195] Correspondingly, the third side wall panel 214 and the fourth side wall panel 215, which are arranged opposite each other in the first direction X, are used to block the two ends of the second box body 22 in the first direction X. That is, the third side wall panel 214, which is connected to the side of the bottom plate 211 facing the top plate 221, is connected to the top plate 221 and also to the two second side wall panels 222. The fourth side wall panel 215, which is connected to the side of the bottom plate 211 facing the top plate 221, is connected to the top plate 221 and also to the two second side wall panels 222, so that the cross section of the first box body 21 perpendicular to the third direction Y is also U-shaped.

[0196] The technical solution of this application embodiment connects the second box body 22 through the third side wall plate 214 and the fourth side wall plate 215 of the first box body 21, so as to realize the mutual connection between the two sides of the first box body 21 and the second box body 22 in the first direction X, thereby realizing the assembly connection between the first box body 21 and the second box body 22 and jointly defining the assembly space 30 for accommodating the battery cell 11. The structure is simple and easy to assemble.

[0197] Please refer to Figure 2 and Figure 6 In some embodiments, the first housing body 21 further includes a first expansion beam 216, which is connected to the bearing surface 2111, and one end of the battery cell assembly 10 in the first direction X abuts against the first expansion beam 216.

[0198] In some embodiments, the first box body 21 may include a first expansion beam 216, which may be connected to the bearing surface 2111. The first expansion beam 216 may be located between the third side wall panel 214 and the fourth side wall panel 215. In the first direction X, the distance between the first expansion beam 216 and the third side wall panel 214 may be less than the distance between the first expansion beam 216 and the fourth side wall panel 215, meaning the first expansion beam 216 is closer to the third side wall panel 214.

[0199] In some embodiments, the first expansion beam 216 abuts against one end of the battery cell assembly 10 in the first direction X, wherein the first expansion beam 216 abuts against the battery cell 11 at that end, that is, the first expansion beam 216 abuts against the first surface 111 of the battery cell 11 at that end.

[0200] In the first direction X, one end of the battery cell assembly 10 can abut against the first expansion beam 216, and the other end can abut against the fourth side wall panel 215.

[0201] Alternatively, the first housing body 21 may also include a second expansion beam 217, and along the first direction X, a third side wall panel 214, a first expansion beam 216, a second expansion beam 217, and a fourth side wall panel 215 may be arranged sequentially. The battery cell assembly 10 may be located between the first expansion beam 216 and the second expansion beam 217. In the first direction X, both ends of the battery cell assembly 10 may abut against the first expansion beam 216 and the second expansion beam 217, respectively.

[0202] 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 has a tendency to expand outward in a direction away from the center line of the battery cell 11 on the third side. The first expansion beam 216 abuts against the first surface 111 of the battery cell 11 to resist the expansion force of the battery cell 11.

[0203] The technical solution of this application embodiment, by setting the first expansion beam 216 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.

[0204] Please refer to Figure 2 and Figure 6 and refer to Figure 8 , Figure 8 This is a schematic diagram of the structure of the first expansion beam and the third sidewall panel provided in some embodiments of this application. In some embodiments, the third sidewall panel 214, the first expansion beam 216, the battery cell assembly 10, and the fourth sidewall panel 215 are arranged sequentially along the first direction X. The bottom plate 211 is provided with a second medium inlet 2113 and a second medium outlet 2114 communicating with the fourth flow channel 2112. Both the second medium inlet 2113 and the second medium outlet 2114 are located between the first expansion beam 216 and the third sidewall panel 214.

[0205] In some embodiments, along the first direction X, the third sidewall 214, the first expansion beam 216, the battery cell assembly 10 and the fourth sidewall 215 are arranged in sequence, wherein 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 216 and the third sidewall 214.

[0206] In some embodiments, the base plate 211 is provided with a second medium inlet 2113 and a second medium outlet 2114, wherein the second medium inlet 2113 and the second medium outlet 2114 can be pipes, which can extend along the second direction Z. One end of the pipe is connected to the fourth flow channel 2112, and the other end protrudes from the bearing surface 2111 in the second direction Z so as to be connected to the connecting pipe for conveying the heat exchange medium.

[0207] In some embodiments, the second medium inlet 2113 and the second medium outlet 2114 may be disposed between the third side wall panel 214 and the first expansion beam 216, sharing space with other electrical components, which is beneficial to improving the space utilization of the battery device 1.

[0208] In some embodiments, the second medium inlet 2113 and the second medium outlet 2114 may be spaced along a third direction Y.

[0209] In some embodiments, the heat exchange medium enters the fourth flow channel 2112 through the second medium inlet 2113 and flows out through the second medium outlet 2114, thereby realizing the circulation of the heat exchange medium in the fourth flow channel 2112.

[0210] The technical solution of this application embodiment arranges the second medium inlet 2113 and the second medium outlet 2114 between the first expansion beam 216 and the third side wall plate 214, which reduces the risk of interference between the second medium inlet 2113 and the second medium outlet 2114 and the battery cell assembly 10, and helps to improve the reliability of the battery device 1.

[0211] Please refer to Figure 2 , Figure 4 , Figures 6 to 8 In some embodiments, the battery device 1 further includes a first connector 2141 and a second connector 2142, which are respectively disposed on the third side wall plate 214. The battery device 1 also includes a first connecting pipe 40 and a second connecting pipe 50, both of which are located between the first expansion beam 216 and the third side wall plate 214. The first connecting pipe 40 connects the second medium inlet 2113 and the first connector 2141, and the second connecting pipe 50 connects the second medium outlet 2114 and the second connector 2142.

[0212] In some embodiments, the battery device 1 may include a first connector 2141 and a second connector 2142. The first connector 2141 and the second connector 2142 can be pipes that pass through the third side wall panel 214. One end of the pipe is located on the side of the third side wall panel 214 facing the first expansion beam 216. A first connecting pipe 40 connects this end of the first connector 2141 to the second medium inlet 2113, and a second connecting pipe 50 connects this end of the second connector 2142 to the second medium outlet 2114. The other end of the pipe is located on the side of the third side wall panel 214 away from the first expansion beam 216 to facilitate communication with an external container. External heat exchange medium is transported to the fourth flow channel 2112 through the first connector 2141, and the heat exchange medium in the fourth flow channel 2112 is discharged from the battery device 1 through the second connector 2142.

[0213] In some embodiments, the first connecting pipe 40 and the second connecting pipe 50 may be made of plastic hose, metal hose, metal rigid pipe, etc.

[0214] In some embodiments, the materials of the first connecting pipe 40 and the second connecting pipe 50 may be the same or different.

[0215] In some embodiments, the battery device 1 may include a third connecting pipe and a fourth connecting pipe. The third connecting pipe connects a first medium inlet 2222 and a first connector 2141, and the fourth connecting pipe connects a first medium outlet 2223 and a second connector 2142. This allows the heat exchange medium to enter a first flow channel 2221 through the first medium inlet 2222 from the first connector 2141, and then through a second flow channel 2211 and another first flow channel 2221, before exiting the battery device 1 from the first medium outlet 2223 and the second connector 2142.

[0216] It should be noted that the first connector 2141 may have multiple interfaces, the first connecting tube 40 is connected to one of the interfaces of the first connector 2141, and the third connecting tube is connected to another interface of the first connector 2141.

[0217] Similarly, the second connector 2142 may have multiple interfaces, with the second connecting tube 50 connected to one of the interfaces of the second connector 2142 and the fourth connecting tube connected to another interface of the second connector 2142.

[0218] The technical solution of this application embodiment connects the second medium inlet 2113 and the first connector 2141 via a first connecting pipe 40, and the second connecting pipe 50 connects the second medium outlet 2114 and the second connector 2142, thereby realizing the circulation of the heat exchange medium in the fourth flow channel 2112, which is beneficial for the bottom plate 211 to manage the temperature of the battery cell assembly 10. At the same time, the first connecting pipe 40 and the second connecting pipe 50 are located between the first expansion beam 216 and the third side wall plate 214, reducing the risk of interference between the first connecting pipe 40 and the second connecting pipe 50 and the battery cell assembly 10, and improving the reliability of the battery device 1.

[0219] Please refer to Figure 2 and Figure 6 In some embodiments, the first housing body 21 further includes a second expansion beam 217, which is connected to the bearing surface 2111 and is disposed opposite to the first expansion beam 216 along the first direction X. The two ends of the battery cell assembly 10 abut against the first expansion beam 216 and the second expansion beam 217, respectively.

[0220] In some embodiments, along the first direction X, the third sidewall 214, the first expansion beam 216, the second expansion beam 217, and the fourth sidewall 215 can be arranged sequentially, and the battery cell assembly 10 can be located between the first expansion beam 216 and the second expansion beam 217. In the first direction X, both ends of the battery cell assembly 10 can respectively abut against the first expansion beam 216 and the second expansion beam 217.

[0221] In some embodiments, the first expansion beam 216 abuts against one end of the battery cell assembly 10 in the first direction X, wherein the first expansion beam 216 abuts against the battery cell 11 at that end, that is, the first expansion beam 216 abuts against the first surface 111 of the battery cell 11 at that end.

[0222] The second expansion beam 217 abuts against the other end of the battery cell assembly 10 in the first direction X, wherein the second expansion beam 217 abuts against the battery cell 11 at that end, that is, the second expansion beam 217 abuts against the first surface 111 of the battery cell 11 at that end.

[0223] In some embodiments, a portion of the plurality of electrical components may be disposed between the first expansion beam 216 and the third sidewall 214, and another portion may be disposed between the second expansion beam 217 and the fourth sidewall 215.

[0224] In some embodiments, multiple electrical components may be disposed between the first expansion beam 216 and the third sidewall 214.

[0225] In some embodiments, in the first direction X, the distance between the first expansion beam 216 and the third side wall plate 214 may be greater than the distance between the second expansion beam 217 and the fourth side wall plate 215.

[0226] In some embodiments, the connection between the first expansion beam 216 and the base plate 211 can be by bonding, welding, integral molding, etc.

[0227] In some embodiments, the connection between the second expansion beam 217 and the base plate 211 can be by bonding, welding, integral molding, etc.

[0228] In some embodiments, the way in which the first expansion beam 216 and the base plate 211 are connected can be the same as or different from the way in which the second expansion beam 217 and the base plate 211 are connected.

[0229] The technical solution of this application embodiment, by setting the first expansion beam 216 and the second expansion beam 217 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.

[0230] Please refer to Figure 6 In some embodiments, there are multiple battery cell assemblies 10, which are arranged along the second direction Z. The first housing body 21 also includes a partition plate 213, which is disposed between two adjacent battery cell assemblies 10. In the first direction X, the two ends of the partition plate 213 are respectively connected to a first expansion beam 216 and a second expansion beam 217.

[0231] 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.

[0232] 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 213 may be parallel to the third direction Y, and the separator 213 may be disposed between two adjacent battery cell assemblies 10.

[0233] Taking two battery cell modules 10 as an example, the number of separators 213 can be one, with the separator 213 located between the two battery cell modules 10.

[0234] Taking a scenario where there are three battery cell modules 10, the number of separator plates 213 can be two. The two separator plates 213 are arranged at intervals along the third direction Y. Along the third direction Y, a second sidewall plate 222, a first battery cell module 10, a separator plate 213, a second battery cell module 10, another separator plate 213, a third battery cell module 10, and another second sidewall plate 222 are arranged sequentially.

[0235] In some embodiments, the number of battery cell assemblies 10 is two.

[0236] In some embodiments, the partition plate 213 may extend along the first direction X, and the two ends of the partition plate 213 in the first direction X may be connected to the first expansion beam 216 and the second expansion beam 217 respectively.

[0237] In some embodiments, the partition plate 213 can be connected to the first expansion beam 216 by bonding, welding, integral molding, etc.

[0238] In some embodiments, the partition plate 213 can be connected to the second expansion beam 217 by bonding, welding, integral molding, etc.

[0239] In some embodiments, the way in which the partition plate 213 connects to the first expansion beam 216 and the way in which the partition plate 213 connects to the second expansion beam 217 may be the same or different.

[0240] During charging and discharging, the battery cell 11 expands, and the first expansion beam 216 and the second expansion beam 217 resist the expansion force of the battery cell 11. The two ends of the separator 213 are respectively connected to the first expansion beam 216 and the second expansion beam 217, so that in the first direction X, the first expansion beam 216 and the second expansion beam 217 are respectively subjected to the tensile force from the separator 213, which helps to improve the reliability of the first expansion beam 216 and the second expansion beam 217 in resisting the expansion of the battery cell 11.

[0241] The technical solution of this application embodiment reduces the risk of interference between two adjacent battery cell assemblies 10 by placing a separator 213 between them. Simultaneously, the separator 213 connects the first expansion beam 216 and the second expansion beam 217, which helps improve the reliability of the first expansion beam 216 and the second expansion beam 217 in resisting the expansion beams of the battery cells 11.

[0242] Please refer to Figure 6 and Figure 7 and refer to Figure 9 , Figure 9 This 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 211 includes a first sub-base plate 2115, a second sub-base plate 2116, and a third sub-base plate 2117 arranged sequentially. The first sub-base plate 2115 is connected to the first expansion beam 216 and the third side wall plate 214. A bearing surface 2111 is disposed on the second sub-base plate 2116. A fourth flow channel 2112 is formed inside the second sub-base plate 2116. The third sub-base plate 2117 is connected to the second expansion beam 217 and the fourth side wall plate 215. The partition plate 213 is connected to the second sub-base plate 2116.

[0243] In some embodiments, along the first direction X, the base plate 211 may include a first sub-base plate 2115, a second sub-base plate 2116 and a third sub-base plate 2117 arranged in sequence.

[0244] The first sub-base plate 2115 is connected to the first expansion beam 216 and the third side wall plate 214. The first sub-base plate 2115 can be welded to the first expansion beam 216 and the third side wall plate 214, or the first sub-base plate 2115 can be integrally formed with the first expansion beam 216 and the third side wall plate 214.

[0245] The third sub-base plate 2117 is connected to the second expansion beam 217 and the fourth side wall plate 215. The third sub-base plate 2117 can be welded to the second expansion beam 217 and the fourth side wall plate 215, or the third sub-base plate 2117 can be integrally formed with the second expansion beam 217 and the fourth side wall plate 215.

[0246] In some embodiments, the bearing surface 2111 may be disposed on the second sub-base plate 2116, that is, the second sub-base plate 2116 bears the battery cell assembly 10. With the second direction Z as the projection direction, the orthographic projection of the second sub-base plate 2116 can cover the orthographic projection of the battery cell assembly 10.

[0247] In some embodiments, the partition plate 213 may be connected to the second sub-base plate 2116. The connection method between the partition plate 213 and the second sub-base plate 2116 may be bonding, welding, integral molding, etc.

[0248] The technical solution of this application embodiment connects the first sub-base plate 2115 to the first expansion beam 216 and the third side wall plate 214, the third sub-base plate 2117 to the second expansion beam 217 and the fourth side wall plate 215, and the second sub-base plate 2116 to the first sub-base plate 2115 and the third sub-base plate 2117, which facilitates the connection of the first expansion beam 216, the third side wall plate 214, the second expansion beam 217 and the fourth side wall plate 215 to the base plate 211.

[0249] Please refer to Figure 6 , Figure 7 and Figure 9 In some embodiments, the second sub-base plate 2116 includes a first portion 21161, a second portion 21162, and a third portion 21163 arranged along a third direction Y. The second portion 21162 is integrally formed with the partition plate 213, and the first portion 21161 and the third portion 21163 are connected through the second portion 21162.

[0250] In some embodiments, the second sub-base plate 2116 may include a first portion 21161, a second portion 21162, and a third portion 21163 arranged along a third direction Y, wherein the thickness direction of the first portion 21161, the thickness direction of the second portion 21162, and the thickness direction of the third portion 21163 are all parallel to the second direction Z.

[0251] In some embodiments, the second part 21162 and the partition plate 213 are integrally formed, wherein the thickness direction of the second part 21162 may be parallel to the second direction Z, and the thickness direction of the partition plate 213 may be parallel to the third direction Y, that is, the partition plate 213 and the second part 21162 can be integrally formed in an inverted "T" shape.

[0252] In some embodiments, the interior of the first portion 21161 and the interior of the third portion 21163 may both have grooves, and the interior of the second portion 21162 has a channel. The second portion 21162 connects the first portion 21161 and the third portion 21163, and the channel of the second portion 21162 connects the groove of the first portion 21161 and the groove of the third portion 21163, so that the first portion 21161, the second portion 21162 and the third portion 21163 together form the fourth flow channel 2112.

[0253] The second medium outlet 2114 can be connected to the groove of the first part 21161, and the second medium inlet 2113 can be connected to the groove of the third part 21163.

[0254] In some embodiments, the third flow channel 2131 inside the partition plate 213 may communicate with the channel of the second part 21162, so that the third flow channel 2131 of the partition plate 213 communicates with the fourth flow channel 2112 of the second sub-base plate 2116.

[0255] The technical solution of this application embodiment is that the second part 21162 is integrally formed with the partition plate 213, and the first part 21161 and the third part 21163 are connected through the second part 21162, which facilitates the connection between the partition plate 213 and the bottom plate 211.

[0256] Please refer to Figure 9 and refer to Figure 10 , Figure 10 for Figure 9Enlarged view at point B. In some embodiments, the first expansion beam 216 is provided with a through hole 2161, which penetrates the first expansion beam 216 along the first direction X, and the partition plate 213 passes through the through hole 2161. The partition plate 213 has a third flow channel 2131 for containing heat exchange medium inside, and a third medium inlet 2132 and a third medium outlet 2133 communicating with the third flow channel 2131 are provided on the partition plate 213. The third medium outlet 2133 and the third medium inlet 2132 are both located on the side of the first expansion beam 216 away from the battery cell assembly 10.

[0257] 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, one side of one battery cell assembly 10 in the third direction Y may be disposed opposite to the other side of the other battery cell assembly 10 in the third direction Y. In the third direction Y, the separator 213 may have two opposing surfaces. One surface of the separator 213 may be thermally connected to one side of one battery cell assembly 10 in the third direction Y, and the other surface may be thermally connected to the other side of the other battery cell assembly 10 in the third direction Y.

[0258] In some embodiments, the partition plate 213 may be a solid plate, and the third flow channel 2131 may be formed by machining or integral extrusion.

[0259] In some embodiments, the partition plate 213 may be composed of multiple plates connected to form the partition plate 213, and a third flow channel 2131 may be formed inside the partition plate 213.

[0260] In some embodiments, the battery cell 11 may have a side in the third direction Y, and the separator 213 may contact the side of at least two battery cells 11 of a battery cell assembly 10. Alternatively, the separator 213 may contact the side of all battery cells 11 of a battery cell assembly 10.

[0261] In some embodiments, the first expansion beam 216 may be provided with a through hole 2161 extending through the first expansion beam 216 in the first direction X, and the partition plate 213 is disposed in the through hole 2161 such that a portion of the partition plate 213 is located between the first expansion beam 216 and the second expansion beam 217, and another portion is located between the first expansion beam 216 and the third side wall plate 214.

[0262] The third medium inlet 2132 and the third medium outlet 2133 can be located in another part of the partition plate 213, so that the third medium inlet 2132 and the third medium outlet 2133 are located between the first expansion beam 216 and the third side wall plate 214.

[0263] In some embodiments, the battery device 1 may include a fifth connecting pipe and a sixth connecting pipe. The fifth connecting pipe may connect a third medium inlet 2132 and a first connector 2141, and the sixth connecting pipe may connect a third medium outlet 2133 and a second connector 2142, so that the heat exchange medium enters the third flow channel 2131 through the third medium inlet 2132 from the first connector 2141, and is discharged from the battery device 1 through the second connector 2142 from the third medium outlet 2133.

[0264] It should be noted that the first connector 2141 may have multiple interfaces. The first connecting tube 40 is connected to one of the interfaces of the first connector 2141, the third connecting tube is connected to another interface of the first connector 2141, and the fifth connecting tube is connected to yet another interface of the first connector 2141.

[0265] Similarly, the second connector 2142 may have multiple interfaces, with the second connecting tube 50 connected to one of the interfaces of the second connector 2142, the fourth connecting tube connected to another interface of the second connector 2142, and the sixth connecting tube connected to yet another interface of the second connector 2142.

[0266] In some embodiments, since the thickness of the partition plate 213 is small, the third medium outlet 2133 and the third medium inlet 2132 can be spaced apart along the second direction Z.

[0267] In some embodiments, the third medium outlet 2133 and the third medium inlet 2132 can be pipes that extend along the first direction X. One end of the pipe extends into the interior of the partition plate 213 and communicates with the third flow channel 2131, while the other end of the pipe extends out to facilitate connection with the third connecting pipe and the fourth connecting pipe.

[0268] The technical solution of this application embodiment, by providing a through hole 2161 in the first expansion beam 216 and having the partition plate 213 pass through the through hole 2161, facilitates the connection between the partition plate 213 and the first expansion beam 216, thereby improving the reliability of the connection between the partition plate 213 and the first expansion beam 216. Simultaneously, the partition plate 213 passing through the through hole 2161 ensures that the third medium inlet 2132 and the third medium outlet 2133 are located on the side of the first expansion beam 216 away from the battery cell assembly 10, thereby reducing the risk of interference between the third medium inlet 2132 and the third medium outlet 2133 and the battery cell assembly 10, and improving the reliability of the battery device 1.

[0269] Please refer to Figure 9 and refer to Figure 11 , Figure 11 for Figure 9Enlarged view at point C. In some embodiments, a connecting block 2134 is provided at one end of the partition plate 213 away from the first expansion beam 216, and a first groove 2171 is provided on the side of the second expansion beam 217 facing the first expansion beam 216. At least a portion of the connecting block 2134 is embedded in the first groove 2171 to restrict the partition plate 213 from disengaging from the second expansion beam 217.

[0270] In some embodiments, the connecting block 2134 may be disposed at one end of the partition plate 213 away from the first expansion beam 216. The connecting block 2134 can be regarded as a limiting structure formed at one end of the partition plate 213 away from the first expansion beam 216. The connecting block 2134 is used to cooperate with the second expansion beam 217 to restrict the partition plate 213 from disengaging from the second expansion beam 217.

[0271] In some embodiments, the contour of the first groove 2171 can match that of the connecting block 2134, facilitating the assembly and positioning of the partition plate 213 and the second expansion beam 217. When the partition plate 213 is assembled with the first expansion beam 216 and the second expansion beam 217, at least a portion of the connecting block 2134 is embedded in the first groove 2171, and the partition plate 213 is connected to the first expansion beam 216 and the second expansion beam 217.

[0272] The technical solution of this application embodiment is that the connecting block 2134 of the partition plate 213 is set in the groove of the second expansion beam 217, which facilitates the connection between the partition plate 213 and the second expansion beam 217 and helps to improve the reliability of the connection between the partition plate 213 and the second expansion beam 217.

[0273] Please refer to Figure 4 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 13 This 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 60. The heat-conducting component 60 includes a first heat-conducting part 61 and a second heat-conducting part 62 connected to each other. The first heat-conducting part 61 is thermally connected to the first surface 111, and the second heat-conducting part 62 is thermally connected to the second sidewall plate 222. And / or a fourth flow channel 2112 is formed inside the bottom plate 211. The fourth flow channel 2112 is used to contain the heat exchange medium, and the second heat-conducting part 62 is thermally connected to the bottom plate 211.

[0274] In some embodiments, the heat-conducting element 60 may include a first heat-conducting part 61 and a second heat-conducting part 62 connected to each other, with the first heat-conducting part 61 and the second heat-conducting part 62 being thermally connected.

[0275] In some embodiments, the first heat-conducting part 61 may be in the form of a plate, and the first heat-conducting part 61 may be thermally connected to the first surface 111. The thermal connection may be such that the first heat-conducting part 61 covers the first surface 111.

[0276] 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 61 covers one of the first surfaces 111.

[0277] In some embodiments, with the first direction X as the projection direction, the orthographic projection of the first heat-conducting part 61 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 61.

[0278] In some embodiments, the second heat-conducting part 62 may be in the form of a plate, and the second heat-conducting part 62 may be thermally connected to the second side wall plate 222 and / or the bottom plate 211, and exchange heat with the first surface 111 through the first heat-conducting part 61.

[0279] In some embodiments, the number of heat-conducting elements 60 can be multiple. One heat-conducting element 60 can be provided for one battery cell 11, or one heat-conducting element 60 can be provided for two battery cells 11, or one heat-conducting element 60 can be provided for two or more battery cells 11.

[0280] In some embodiments, taking one second heat-conducting part 62 as an example, and two battery cells 11 corresponding to one heat-conducting element 60, the base plate 211 may be provided with a fourth flow channel 2112, and the second heat-conducting part 62 may be located between the base plate 211 and the battery cell assembly 10. The second heat-conducting part 62 is connected to the lower end of the first heat-conducting part 61 in the second direction Z, and with the second direction Z as the projection direction, the orthographic projection of the second heat-conducting part 62 overlaps with the orthographic projection of the two battery cells 11.

[0281] The second sidewall 222 may be provided with a first flow channel 2221, and the second heat-conducting part 62 may be located between the second sidewall 222 and the battery cell assembly 10. The second heat-conducting part 62 is connected to one end of the first heat-conducting part 61 in the third direction Y. With the third direction Y as the projection direction, the orthographic projection of the second heat-conducting part 62 overlaps with the orthographic projection of the two battery cells 11.

[0282] In some embodiments, taking two second heat-conducting parts 62 as an example, with one heat-conducting element 60 corresponding to two battery cells 11. The base plate 211 is provided with a fourth flow channel 2112, and the second sidewall plate 222 is provided with a first flow channel 2221. One second heat-conducting part 62 can be located between the base plate 211 and the battery cell assembly 10, and the other second heat-conducting part 62 can be located between the second sidewall plate 222 and the battery cell assembly 10. One second heat-conducting part 62 is connected to the lower end of the first heat-conducting part 61 in the second direction Z, and another second heat-conducting part 62 is connected to one end of the first heat-conducting part 61 in the third direction Y. With the second direction Z as the projection direction, the orthographic projection of one second heat-conducting part 62 overlaps with the orthographic projection of the two battery cells 11. With the third direction Y as the projection direction, the orthographic projection of the other second heat-conducting part 62 overlaps with the orthographic projection of the two battery cells 11.

[0283] There are two second sidewall panels 222, each with a first flow channel 2221. One second heat-conducting part 62 can be located between one second sidewall panel 222 and the battery cell assembly 10, and the other second heat-conducting part 62 can be located between the other second sidewall panel 222 and the battery cell assembly 10. The two second heat-conducting parts 62 are respectively connected to the two ends of the first heat-conducting part 61 in the third direction Y. With the third direction Y as the projection direction, the orthographic projection of one second heat-conducting part 62 overlaps with the orthographic projection of the two battery cells 11, and the orthographic projection of the other second heat-conducting part 62 also overlaps with the orthographic projection of the two battery cells 11.

[0284] In some embodiments, taking three second heat-conducting parts 62 as an example, with one heat-conducting element 60 corresponding to two battery cells 11. The base plate 211 is provided with a fourth flow channel 2112, and there are two second sidewall plates 222, each with a first flow channel 2221. One second heat-conducting part 62 can be located between the base plate 211 and the battery cell assembly 10, another second heat-conducting part 62 can be located between one second sidewall plate 222 and the battery cell assembly 10, and yet another second heat-conducting part 62 can be located between another second sidewall plate 222 and the battery cell assembly 10. One second heat-conducting part 62 is connected to the lower end of the first heat-conducting part 61 in the second direction Z, another second heat-conducting part 62 is connected to one end of the first heat-conducting part 61 in the third direction Y, and yet another second heat-conducting part 62 is connected to the other end of the first heat-conducting part 61 in the third direction Y. With the second direction Z as the projection direction, the orthographic projection of one second heat-conducting part 62 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 62 overlaps with the orthographic projection of two battery cells 11, and the orthographic projection of yet another second heat-conducting part 62 overlaps with the orthographic projection of two battery cells 11.

[0285] The technical solution of this application embodiment, by setting a heat-conducting component 60, makes the first heat-conducting part 61 thermally connected to the first surface 111, and the second heat-conducting part 62 thermally connected to the second side wall plate 222 and / or the bottom plate 211. Thus, the temperature of the first surface 111 can be regulated by the heat-conducting component 60, which can better manage the temperature of the battery cell 11, reduce the risk that the temperature of the battery cell 11 will affect the charging and discharging efficiency, and help improve the reliability of the battery device 1.

[0286] Please refer to Figure 12 and Figure 13 In some embodiments, the material of the heat conductor 60 includes at least one of graphene, carbon nanotubes, and silicene.

[0287] In some embodiments, the heat-conducting element 60 may be made of graphene.

[0288] 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 60 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.

[0289] Please refer to Figure 2 and Figure 4 In some embodiments, a second flow channel 2211 is formed inside the top plate 221 for containing a heat exchange medium. In the second direction Z, the battery cell 11 has a second surface 112 facing the top plate 221. The battery cell 11 includes an electrode terminal 114 disposed on the second surface 112. The top plate 221 is thermally connected to the second surface 112.

[0290] 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 221. 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.

[0291] In some embodiments, a second flow channel 2211 for accommodating a heat exchange medium is formed inside the top plate 221. The top plate 221 is thermally connected to the second surface 112.

[0292] The technical solution of this application embodiment, through the thermally conductive connection between the top plate 221 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.

[0293] Please refer to Figure 2and Figure 4 In some embodiments, a second flow channel 2211 is formed inside the top plate 221 for containing a heat exchange medium. In the second direction Z, the battery cell 11 has a second surface 112 facing the top plate 221. 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. The top plate 221 is thermally connected to the busbar 12.

[0294] 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 221. 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.

[0295] In some embodiments, a second flow channel 2211 for accommodating a heat exchange medium is formed inside the top plate 221. The busbar component 12 is electrically connected to the electrode terminals 114 of a plurality of battery cells 11, and the thermal management assembly is thermally connected to the busbar component 12.

[0296] The technical solution of this application embodiment, through the thermal connection between the top plate 221 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.

[0297] Please refer to Figure 14 , Figure 14 This 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 second sidewall 222, the battery cell 11 includes an electrode terminal 114 disposed on the third surface 113, and the second sidewall 222 is thermally connected to the third surface 113.

[0298] In some embodiments, in the third direction Y, the battery cell 11 may have two opposing third surfaces 113, one third surface 113 facing a second sidewall 222 and the other third surface 113 facing another sidewall. 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.

[0299] In some embodiments, the interior of the second sidewall 222 has a first flow channel 2221 for accommodating the heat exchange medium. The second sidewall 222 is thermally connected to the third surface 113.

[0300] 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. The second sidewall plate 222 facing the third surface 113 on which the electrode terminals 114 are disposed can be formed with a first flow channel 2221, and the second sidewall plate 222 is thermally connected to the third surface 113.

[0301] 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 second sidewall plates 222 can be provided with first flow channels 2221, with one second sidewall plate 222 thermally connected to one third surface 113 and the other second sidewall plate 222 thermally connected to the other third surface 113.

[0302] The technical solution of this application embodiment, through the thermally conductive connection between the second side wall plate 222 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.

[0303] 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.

[0304] Please refer to Figure 2 and Figure 4 In some embodiments, the battery device 1 includes a battery cell assembly 10, which includes a plurality of battery cells 11 arranged 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 direction X may be parallel to the length direction of the battery device 1.

[0305] The battery assembly 1 also includes a first housing body 21 and a second housing body 22. The first housing body 21 includes a bottom plate 211 and a first side wall plate 212. The bottom plate 211 has a bearing surface 2111 on one side in the second direction Z, which supports the battery cell 11 along the second direction Z. The first side wall plate 212 is connected to the bottom plate 211 and protrudes from the bearing surface 2111. The second housing body 22 and the first housing body 21 together define an assembly space 30 for accommodating the battery cell assembly 10. The second housing body 22 includes a top plate 221 and a second side wall plate 222. The top plate 221 and the bottom plate 211 are arranged opposite each other in the second direction Z. The second side wall plate 222 is connected to the first side wall plate 212, and the end of the second side wall plate 222 away from the bottom plate 211 in the second direction Z is connected to the top plate 221. Along the second direction Z, the dimension of the first side wall plate 212 protruding from the bearing surface 2111 is less than one-quarter of the maximum dimension of the second side wall plate 222. The second direction Z is parallel to the height direction of the battery device 1, and the third direction Y can be parallel to the width direction of the battery device 1.

[0306] The first housing body 21 and the second housing body 22 together define the assembly space 30 for accommodating the battery cell assembly 10, which helps reduce the risk of damage to the battery cell assembly 10 and thus improves the reliability of the battery device 1. At the same time, the first side wall plate 212 connects to the second side wall plate 222, thereby improving the convenience of connecting the first housing body 21 and the second housing body 22.

[0307] Since the first housing body 21 is used to support the battery cell assembly 10, it requires high structural strength and has a high cost. By setting the size of the first side wall plate 212 protruding from the bearing surface 2111 to be less than one-quarter of the maximum size of the second side wall plate 222, the size of the first side wall plate 212 used for assembly and connection with the second housing body 22 is smaller, which helps to reduce the cost of the first housing body 21. At the same time, the size of the second side wall plate 222 used for assembly and connection with the first housing body 21 is larger, which allows the second side wall plate 222 to limit the battery cell assembly 10 in the third direction Y, which helps to improve the reliability of the second housing body 22 in accommodating the battery cell assembly 10, thereby improving the reliability of the battery device 1.

[0308] The second sidewall 222 is thermally connected to one side of the battery cell assembly 10 in the third direction Y. A first flow channel 2221 is formed inside the second sidewall 222, which is used to contain the heat exchange medium. The second sidewall 222 is configured to manage the temperature of at least two battery cells 11 in the battery cell assembly 10.

[0309] By providing a first flow channel 2221 inside the second side wall panel 222, the second side wall panel 222 can exchange heat with the battery cell assembly 10 in the third direction Y, which is beneficial for managing the temperature of the battery cell assembly 10 and improving the reliability of the battery device 1.

[0310] 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 arranged along a first direction, wherein 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 bottom plate and a first 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 is connected to the bottom plate and protrudes from 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 second housing body includes a top plate and a second side wall plate. The top plate and the bottom plate are arranged opposite to each other along the second direction. The second side wall plate is connected to the first side wall plate, and the end of the second side wall plate away from the bottom plate in the second direction is connected to the top plate. Along the second direction, the dimension of the first side wall plate protruding from the bearing surface is less than one-quarter of the maximum dimension of the second side wall plate. The second sidewall is thermally connected to the battery cell assembly on one side in the third direction. A first flow channel is formed inside the second sidewall for containing a heat exchange medium. The second sidewall is configured to manage the temperature of at least two battery cells in 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 number of first sidewall panels is two, and the two first sidewall panels are arranged opposite to each other along the third direction; There are two second sidewall panels, which are arranged opposite each other along the third direction. One second sidewall panel is connected to one first sidewall panel, and the other second sidewall panel is connected to the other first sidewall panel.

3. The battery device according to any one of claims 1-2, characterized in that, The top plate is thermally connected to one side of the battery cell assembly in the second direction. A second flow channel is formed inside the top plate for containing a heat exchange medium. The top plate is configured to manage the temperature of at least two battery cells in the battery cell assembly.

4. The battery device according to claim 3, characterized in that, The top plate and the second side wall plate are integrally formed.

5. The battery device according to claim 4, characterized in that, There are two second sidewall panels, and the two second sidewall panels are connected to the two ends of the top plate in the third direction; The first flow channel and the second flow channel of the two second sidewalls are interconnected. One second sidewall is provided with a first medium inlet that communicates with the first flow channel, and the other second sidewall is provided with a first medium outlet that communicates with the first flow channel.

6. The battery device according to any one of claims 2, 4-5, characterized in that, A battery cell assembly is disposed between the two second sidewalls, one of the second sidewalls being thermally connected to the third-side upward side of the battery cell assembly, and the other second sidewall being thermally connected to the other third-side upward side of the battery cell assembly.

7. The battery device according to any one of claims 2, 4-5, characterized in that, A plurality of battery cell assemblies are disposed between the two second sidewall panels, and the plurality of battery cell assemblies are arranged along the second direction; The first housing body also includes a partition plate disposed between two adjacent battery cell assemblies. The partition plate has a third 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.

8. The battery device according to any one of claims 1-2 and 4-5, characterized in that, The base plate is thermally connected to one side of the battery cell assembly in the second direction. A fourth flow channel is formed inside the base plate for containing a heat exchange medium. The base plate is configured to manage the temperature of at least two battery cells in the battery cell assembly.

9. The battery device according to claim 8, characterized in that, The first box body further includes a third side wall panel and a fourth side wall panel, which are arranged opposite to each other along the first direction. Both the third side wall panel and the fourth side wall panel are connected to the bearing surface, and both the third side wall panel and the fourth side wall panel are connected to the second box body.

10. The battery device according to claim 9, 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.

11. The battery device according to claim 10, characterized in that, Along the first direction, the third sidewall panel, the first expansion beam, the battery cell assembly, and the fourth sidewall panel are arranged in sequence; The base plate is provided with a second medium inlet and a second medium outlet that communicate with the fourth flow channel. The second medium inlet and the second medium outlet are both located between the first expansion beam and the third side wall plate.

12. The battery device according to claim 11, characterized in that, The battery device further includes a first connector and a second connector, which are respectively disposed on the third 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 third side wall plate. The first connecting pipe connects the second medium inlet and the first connector, and the second connecting pipe connects the second medium outlet and the second connector.

13. The battery device according to claim 10, characterized in that, The first box body also includes a second expansion beam, which is connected to the bearing surface 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.

14. The battery device according to claim 13, characterized in that, The number of battery cell assemblies is multiple, and the multiple battery cell assemblies are arranged along the second 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.

15. The battery device according to claim 14, 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 third side wall plate. The bearing surface is disposed on the second sub-base plate. The fourth flow channel is formed inside the second sub-base plate. The third sub-base plate is connected to the second expansion beam and the fourth side wall plate. The partition plate is connected to the second sub-base plate.

16. The battery device according to claim 15, characterized in that, The second sub-base plate includes a first part, a second part, and a third part arranged along the third 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.

17. The battery device according to claim 14, characterized in that, The first expansion beam is provided with a through hole, the through hole extends through the first expansion beam along the first direction, and the partition plate passes through the through hole; The partition plate has a third flow channel inside for accommodating the heat exchange medium, and the partition plate is provided with a third medium inlet and a third medium outlet communicating with the third flow channel. The third medium outlet and the third medium inlet are both located on the side of the first expansion beam away from the battery cell assembly.

18. The battery device according to claim 14, 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 first groove on the side facing the first expansion beam. At least a portion of the connecting block is embedded in the first groove to prevent the partition plate from detaching from the second expansion beam.

19. 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 the second sidewall plate. And / or, The base plate has a fourth flow channel inside, which is used to contain the heat exchange medium, and the second heat-conducting part is thermally connected to the base plate.

20. The battery device according to claim 19, characterized in that, The material of the heat-conducting component includes at least one of graphene, carbon nanotubes, and silicene.

21. The battery device according to claim 1, characterized in that, The top plate has a second flow channel inside, which is used to contain the heat exchange medium. In the second direction, the battery cell has a second surface facing the top plate. The battery cell includes an electrode terminal, which is disposed on the second surface. The top plate is thermally connected to the second surface.

22. The battery device according to claim 1, characterized in that, The top plate has a second flow channel inside, which is used to contain the heat exchange medium. In the second direction, the battery cell has a second surface facing the top plate. The battery cell includes an electrode terminal, which is disposed on the second surface. The battery cell assembly also includes a busbar component, which is electrically connected to the electrode terminals of the plurality of battery cells, and the top plate is thermally connected to the busbar component.

23. The battery device according to claim 1, characterized in that, In the third direction, the battery cell has a third surface facing the second sidewall panel, the battery cell includes electrode terminals disposed on the third surface, and the second sidewall panel is thermally connected to the third surface.

24. An electrical appliance, characterized in that, The battery device includes any one of claims 1-23, the battery device being used to provide electrical energy to the electrical device.

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