Battery device and electric device

Abstract

The application provides a battery device and a power utilization device. The battery device comprises a box body and a battery cell assembly. The battery cell assembly is arranged in the box body, and the battery cell assembly comprises a plurality of battery cells arranged in a first direction in a stacked manner. The battery cell has a first surface perpendicular to the first direction, and the first surface is a surface with the largest area of the battery cell. The battery cell assembly has opposite first and second sides in a third direction, and the battery cell assembly has opposite third and fourth sides in a second direction. The box body comprises a heat management assembly, the heat management assembly is in heat conduction connection with at least two of the first side, the second side, the third side and the fourth side, and an internal part of the heat management assembly is formed with a flow channel for accommodating a heat exchange medium. The technical scheme provided by the application can improve the energy density 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 energy density 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 energy density 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 housing and a battery cell assembly. The housing has a dimension L1 along a first direction and a dimension L2 along a second direction, satisfying 1000mm≤L1≤2300mm, 630mm≤L2≤780mm, and 0.27≤L2 / L1≤0.78. The battery cell assembly is disposed within the housing, and the battery cell assembly includes a plurality of battery cells stacked along the 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 battery cell assembly has a first side and a second side opposite to each other in a third direction, and a third side and a fourth side opposite to each other in the second direction. The first direction, the second direction, and the third direction are perpendicular to each other, and the third direction is parallel to the direction of gravity. The housing includes a thermal management component, which is thermally connected to at least two of the first, second, third, and fourth sides. The thermal management component has a flow channel formed inside, which is used to accommodate a heat exchange medium.

[0007] The technical solution of this application embodiment, through thermally conductive connection of the thermal management component with at least two of the first, second, third, and fourth sides, enables the thermal management component to better manage the temperature of the battery cells, reducing the risk of battery cell temperature affecting charge and discharge efficiency, and thus improving the reliability of the battery device. Simultaneously, the battery cells are stacked along the first direction, and the dimensions of the housing in the first direction and the second direction satisfy the aforementioned conditions, resulting in a large number of battery cells. The first surface is perpendicular to the stacking direction of the multiple battery cells. Compared to thermally conductive connection between the thermal management component and the first surface of the battery cells, this method requires separate heat exchange components (such as water-cooled plates, water-cooled pipes, etc.) for each battery cell, resulting in a larger number of heat exchange components, higher cost, and greater space occupation in the housing in the first direction, affecting the energy density of the battery device. Therefore, the solution of this application is beneficial for cost savings and improving the space utilization of the battery device, thereby improving the energy density of the battery device.

[0008] In some embodiments, the thermal management component is thermally connected to at least three of the first, second, third, and fourth sides.

[0009] The technical solution of this application embodiment, through thermally conductive connection of the thermal management component to at least three of the first, second, third, and fourth sides, enables the thermal management component to better manage the temperature of the battery cells, reducing the risk of battery cell temperature affecting charge and discharge efficiency, and thus improving the reliability of the battery device. Furthermore, compared to thermally conductive connection between the thermal management component and the first surface of the battery cells, the solution of this application is more cost-effective, improves the space utilization of the battery device, and consequently increases the energy density of the battery device.

[0010] In some embodiments, the thermal management component is thermally connected to the first side, the second side, the third side, and the fourth side.

[0011] The technical solution of this application embodiment, through thermally conductive connections between the thermal management component and the first, second, third, and fourth sides, enables the thermal management component to better manage the temperature of the battery cells, reducing the risk of battery cell temperature affecting charge and discharge efficiency, and thus improving the reliability of the battery device. Furthermore, compared to a thermally conductive connection between the thermal management component and the first surface of the battery cells, this solution is more cost-effective, improves the space utilization of the battery device, and consequently increases the energy density of the battery device.

[0012] In some embodiments, the enclosure includes a first enclosure body and a second enclosure body. The first enclosure body includes a base plate with a bearing surface on one side in the third direction for supporting the battery cell assembly in the third direction. The second enclosure body, together with the first enclosure body, defines an assembly space for accommodating the battery cell assembly. The second enclosure body includes a top plate and two first side wall panels, the top plate and the base plate being disposed opposite each other in the third direction, and the two first side wall panels being disposed opposite each other in a second direction. The first side wall panels are connected to the top plate at one end in the third direction.

[0013] The technical solution of this application embodiment defines the assembly space for accommodating battery cell components by jointly defining the first box body and the second box body, which helps to reduce the risk of damage to battery cell components and thus improves the reliability of the battery device.

[0014] In some embodiments, the first box body further includes two second sidewalls, which are arranged opposite to each other along a second direction. The second sidewalls are connected to the bottom plate and protrude from the bearing surface, and the first sidewall is connected to the second sidewall.

[0015] The technical solution of this application embodiment connects the first box body and the second box body by connecting the first side wall panel to the second side wall panel, which helps to improve the convenience of connecting the first box body and the second box body.

[0016] In some embodiments, along a third direction, the second sidewall protrudes from the bearing surface by a dimension less than one-quarter of the maximum dimension of the first sidewall.

[0017] The technical solution of this application embodiment, along a third direction, sets the size of the second sidewall panel protruding from the bearing surface to be less than one-quarter of the maximum size of the first sidewall panel. This makes the size of the second sidewall panel used for assembly and connection between the first box body and the second box body smaller, which is beneficial for optimizing the size of the first box body in the first direction and reducing the binding force of the first box body on the second box body. This reduces the assembly difficulty between the first box body and the target component, and also reduces the difficulty of assembling the battery cells onto the bearing plate, thereby reducing the assembly difficulty of the battery device. Simultaneously, since the first box body is used to support the battery cell assembly, it requires high structural strength and has a high cost. With the dimensions of the box body remaining unchanged in the third direction, the smaller size of the second sidewall panel helps to reduce the cost of the first box body.

[0018] In some embodiments, the thermal management assembly includes a base plate thermally connected to a first side, the interior of the base plate having a first flow channel for receiving a heat exchange medium, and the base plate being configured to manage the temperature of at least two battery cells in a battery cell assembly.

[0019] The technical solution of this application embodiment achieves heat exchange between the base plate and the battery cell assembly by forming a first flow channel inside the base plate to accommodate the heat exchange medium, which helps to improve the reliability of the battery device.

[0020] 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.

[0021] 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 first box body and the second box body on both sides in the third 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.

[0022] 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.

[0023] 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.

[0024] 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 first medium inlet and a first medium outlet, communicating with a first flow channel, are provided on the bottom plate, both located between the first expansion beam and the third sidewall panel.

[0025] The technical solution of this application embodiment sets the first medium inlet and the first medium outlet between the first expansion beam and the third side wall plate, which reduces the risk of interference between the first medium inlet and the first medium outlet and the battery cell assembly, and helps to improve the reliability of the battery device.

[0026] In some embodiments, the thermal management assembly further includes a first connector and a second connector, which are respectively disposed on the third sidewall plate. The thermal management assembly also includes a first connecting pipe and a second connecting pipe, both of which are located between the first expansion beam and the third sidewall plate. The first connecting pipe connects the first medium inlet and the first connector, and the second connecting pipe connects the first medium outlet and the second connector.

[0027] The technical solution of this application embodiment connects the first medium inlet and the first connector via a first connecting pipe, and the second connecting pipe connects the first medium outlet and the second connector, thereby realizing the circulation of the heat exchange medium in the first flow channel, which is beneficial for the bottom plate to manage the temperature of the battery cell assembly. At the same time, the first and second connecting pipes are located between the first expansion beam and the 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.

[0028] In some embodiments, the first housing body further includes a second expansion beam, which is connected to the base plate and is disposed opposite to the first expansion beam along a first direction, and the two ends of the battery cell assembly abut against the first expansion beam and the second expansion beam, respectively.

[0029] 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.

[0030] 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.

[0031] The technical solution of this application embodiment reduces the risk of interference between adjacent battery cell assemblies 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.

[0032] In some embodiments, the thermal management assembly further includes a partition plate having a second flow channel formed inside the partition plate for containing a heat exchange medium, the partition plate being configured to manage the temperature of at least two battery cells in the battery cell assembly.

[0033] The technical solution of this application embodiment achieves heat exchange between the separator and the battery cell assembly by forming a second flow channel inside the separator to accommodate the heat exchange medium, which helps to improve the reliability of the battery device.

[0034] 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 first flow channel is formed inside the second sub-base plate. The third sub-base plate is connected to a second expansion beam and a fourth sidewall plate. A partition plate is connected to the second sub-base plate.

[0035] 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.

[0036] In some embodiments, the second sub-base plate includes a first portion, a second portion, and a third portion arranged along a second direction, wherein the second portion is integrally formed with a partition plate, and the first portion and the third portion are connected through the second portion.

[0037] 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.

[0038] 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 is provided with a second medium inlet and a second medium outlet that communicate with the second flow channel, and both the second medium outlet and the second medium inlet are located on the side of the first expansion beam away from the battery cell assembly.

[0039] The technical solution of this application embodiment, by providing a through hole in the first expansion beam and having a partition plate pass through the through hole, facilitates the connection between the partition plate and the first expansion beam, thereby improving the reliability of the connection between the partition plate and the first expansion beam. Simultaneously, the partition plate passing through the through hole ensures that the second medium inlet and the second medium outlet are located on the side of the first expansion beam away from the battery cell assembly, which helps reduce the risk of interference between the second medium inlet and the second medium outlet and the battery cell assembly, thus improving the reliability of the battery device.

[0040] In some embodiments, a connecting block is provided at the end of the partition plate away from the first expansion beam, and a groove is provided on the side of the second expansion beam facing the first expansion beam. At least a portion of the connecting block is embedded in the groove to restrict the partition plate from detaching from the second expansion beam.

[0041] 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.

[0042] In some embodiments, the thermal management assembly includes a top plate thermally connected to a second side, the interior of which is formed a third flow channel for containing a heat exchange medium, and the top plate is configured to manage the temperature of at least two battery cells in the battery cell assembly.

[0043] The technical solution of this application embodiment achieves heat exchange between the top plate and the battery cell assembly by forming a third flow channel inside the top plate to accommodate the heat exchange medium, which helps to improve the reliability of the battery device.

[0044] In some embodiments, the thermal management assembly includes a first sidewall panel with a fourth flow channel formed inside the first sidewall panel for receiving a heat exchange medium, the first sidewall panel being configured to manage the temperature of at least two battery cells in the battery cell assembly.

[0045] The technical solution of this application embodiment achieves heat exchange between the first side wall plate and the battery cell assembly by forming a fourth flow channel inside the first side wall plate for accommodating the heat exchange medium, which helps to improve the reliability of the battery device.

[0046] In some embodiments, the first sidewall panel and the top panel are integrally formed.

[0047] The technical solution of this application embodiment is that the first side wall panel and the top plate are integrally formed, which facilitates the processing of the second box body.

[0048] In some embodiments, a third flow channel for containing heat exchange medium is formed inside the top plate. The third flow channel and the fourth flow channel are interconnected. A third medium inlet communicating with the third flow channel is provided on one first side wall, and a third medium outlet communicating with the third flow channel is provided on another first side wall.

[0049] The technical solution of this application embodiment, by setting a third medium inlet on one first side wall and a third medium outlet on another first side wall, realizes the circulation of heat exchange medium in the third and fourth flow channels, which is beneficial for the first side wall and top plate to manage the temperature of the battery cell assembly.

[0050] In some embodiments, a battery cell assembly is disposed between the two first sidewalls, one first sidewall is thermally connected to the third side of the battery cell assembly, and the other first sidewall is thermally connected to the fourth side of the battery cell assembly.

[0051] The technical solution of this application embodiment, through a first sidewall plate thermally connected to the third side of the battery cell assembly and another first sidewall plate thermally connected to the fourth side of the battery cell assembly, can better manage the temperature of the battery cell, reduce the risk of the battery cell temperature affecting the charging and discharging efficiency, and help improve the reliability of the battery device.

[0052] In some embodiments, a plurality of battery cell assemblies are disposed between two first sidewall panels, and the plurality of battery cell assemblies are arranged along a second direction. The thermal management assembly further includes a partition plate disposed between two adjacent battery cell assemblies, the partition plate having a second 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.

[0053] The technical solution of this application embodiment, through the joint thermal connection of two first sidewalls and a partition plate with the third and fourth sides of the battery cell assembly, can better manage the temperature of the battery cell, reduce the risk of the battery cell temperature affecting the charging and discharging efficiency, and help improve the reliability of the battery device.

[0054] In some embodiments, the outer surface of the battery cell is covered with a thermally conductive component, 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 thermal management component.

[0055] The technical solution of this application embodiment, by setting a heat-conducting component, makes the first heat-conducting part thermally connected to the first surface and the second heat-conducting part thermally connected to the thermal management component, so that the thermal management component can regulate the temperature of the first surface through the heat-conducting component, which can better manage the temperature of the battery cells, reduce the risk of the battery cell temperature affecting the charging and discharging efficiency, and help improve the reliability of the battery device.

[0056] In some embodiments, the battery cell includes electrode terminals located on a second side. Second heat-conducting portions are provided on the first, third, and fourth sides.

[0057] The technical solution of this application embodiment, through the thermal connection between the second heat-conducting part and the first side, the third side and the fourth side, can better manage the temperature of the battery cell, reduce the risk of the battery cell temperature affecting the charging and discharging efficiency, and at the same time reduce the risk of interference between the heat-conducting part and the electrode terminals, which is conducive to improving the reliability of the battery device.

[0058] In some embodiments, the material of the thermal conductive element includes at least one of graphene, carbon nanotubes, and silicene.

[0059] 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.

[0060] In some embodiments, the thermal management component is thermally connected to the second side. In the third direction, the battery cell has a second surface located on the second side. The battery cell includes electrode terminals disposed on the second surface, and the thermal management component is thermally connected to the second surface.

[0061] The technical solution of this application embodiment, through the thermal management component and the second surface thermally connected, can better manage the temperature of the battery cells, reduce the risk of the battery cell temperature affecting the charging and discharging efficiency, and help improve the reliability of the battery device.

[0062] In some embodiments, the thermal management assembly is thermally connected to the second side. In the third direction, the battery cell has a second surface located on the second side, and the battery cell includes electrode terminals disposed on the second surface. The battery cell assembly also includes a busbar electrically connected to the electrode terminals of a plurality of battery cells, and the thermal management assembly is thermally connected to the busbar.

[0063] The technical solution of this application embodiment, through the thermal management component and the busbar component being thermally connected, 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.

[0064] In some embodiments, the thermal management component is thermally connected to a third side, and in a second direction, the battery cell has a third surface located on the third side. The battery cell includes electrode terminals disposed on the third surface, and the thermal management component is thermally connected to the third surface.

[0065] The technical solution of this application embodiment, through the thermal management component and the third surface thermally conductive connection, 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.

[0066] 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.

[0067] 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

[0068] 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.

[0069] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0070] Figure 2 This is an exploded view of the structure of a battery device provided in some embodiments of this application;

[0071] Figure 3 This is an exploded view of the structure of a battery cell provided in some embodiments of this application;

[0072] Figure 4Schematic diagram of a battery device provided for some embodiments of this application;

[0073] Figure 5 for Figure 4 Sectional view of AA;

[0074] Figure 6 Structural schematic diagrams of the first expansion beam and the third sidewall plate provided for some embodiments of this application;

[0075] Figure 7 This is an exploded view of the structure of a battery device provided in other embodiments of this application;

[0076] Figure 8 This is a schematic diagram of the internal structure of a battery device provided in other embodiments of this application;

[0077] 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;

[0078] Figure 10 for Figure 9 Enlarged view of point B in the middle;

[0079] Figure 11 for Figure 9 Enlarged view of point C in the middle;

[0080] Figure 12 A schematic diagram of a battery device from another perspective, provided for some embodiments of this application;

[0081] Figure 13 This is a schematic diagram illustrating the assembly of a heat-conducting component with a battery cell according to some embodiments of this application;

[0082] Figure 14 This is a schematic diagram of the structure of a heat-conducting component provided in some embodiments of this application;

[0083] Figure 15 This is an exploded view of the structure of a battery device provided in some embodiments of this application.

[0084] Icons: 1-Battery unit; 10-Box body; 11-Thermal management assembly; 111-Flow channel; 112-First connector; 113-Second connector; 114-First connecting pipe; 115-Second connecting pipe; 12-First box body; 121-Bottom plate; 1211-Bearing surface; 1212-First flow channel; 1213-First medium inlet; 1214-First medium outlet; 1215-First sub-bottom plate; 1216-Second sub-bottom plate; 12161-First section; 12162-Second section; 12163-Third section; 1217-Third sub-bottom plate; 122-Second side wall plate; 123-Third side wall plate; 124-Fourth side wall plate; 125-First expansion beam; 1251-Through hole; 126-Second expansion beam; 1261-Groove; 127-Divider plate; 1271-Second flow channel; 1272-Second medium inlet ; 1273-Second medium outlet; 1274-Connecting block; 13-Second box body; 131-Top plate; 1311-Third flow channel; 132-First side wall plate; 1321-Fourth flow channel; 1322-Third medium inlet; 1323-Third medium outlet; 14-Assembly space; 20-Battery cell assembly; 21-Battery cell; 211-First surface; 212-Second surface; 213-Third surface; 214-Electrode terminal; 215-Shell; 2151-End cap; 2152-Shell; 216-Electrode assembly; 22-First side; 23-Second side; 24-Third side; 25-Fourth side; 26-Busting component; 30-Heat conductor; 31-First heat conductor; 32-Second heat conductor; 100-Vehicle; 110-Controller; 120-Motor; X-First direction; Y-Second direction; Z-Third direction. Detailed Implementation

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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).

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] 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.

[0105] 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.).

[0106] 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.

[0107] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative current collector.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] 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.

[0114] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0115] In some implementations, the electrode assembly is a stacked structure.

[0116] 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.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] 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.

[0121] 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.

[0122] 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.

[0123] 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, with changes in environmental conditions and / or internal battery conditions, the energy density of battery devices is also one of the key factors to consider.

[0124] Due to factors such as battery capacity requirements and space adaptability, commercial vehicle battery packs are typically designed to be relatively long, with a large number of individual battery cells arranged along the length of the pack. The largest surface area of ​​each individual battery cell is perpendicular to the length of the pack. Since the charging and discharging efficiency of individual battery cells is usually temperature-dependent, multiple water-cooling plates are incorporated into the battery pack to meet their temperature requirements. The largest surface area of ​​each individual battery cell is thermally connected to one of these water-cooling plates.

[0125] However, the above-mentioned methods of managing the temperature of individual battery cells require a large number of water-cooled plates, which occupy a significant amount of internal space in the battery device, affecting the space utilization rate of the battery device and thus its energy density.

[0126] Based on the above considerations, in order to solve the problem of poor energy density of individual battery cells due to excessive internal space occupied by the battery device, this application provides a battery device. The battery device includes a housing and a battery cell assembly. The housing has a dimension L1 along a first direction and a dimension L2 along a second direction, satisfying 1000mm≤L1≤2300mm, 630mm≤L2≤780mm, and 0.27≤L2 / L1≤0.78. The battery cell assembly is disposed in the housing, and the battery cell assembly includes multiple battery cells stacked along the 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 battery cell assembly has a first side and a second side opposite to each other in a third direction, and a third side and a fourth side opposite to each other in the second direction. The first direction, the second direction, and the third direction are perpendicular to each other, and the third direction is parallel to the direction of gravity. The housing includes a thermal management component, which is thermally connected to at least two of the first, second, third, and fourth sides. The thermal management component has a flow channel formed inside, which is used to accommodate a heat exchange medium.

[0127] By thermally connecting the thermal management component to at least two of the first, second, third, and fourth sides, the component can effectively manage the temperature of individual battery cells, reducing the risk of individual cell temperature affecting charge and discharge efficiency and improving the reliability of the battery device. Simultaneously, the battery cells are stacked along the first direction, and the dimensions of the housing in the first and second directions satisfy the aforementioned conditions, resulting in a large number of battery cells. The first surface is perpendicular to the stacking direction of the multiple battery cells. Compared to thermally connecting the thermal management component to the first surface of the battery cells, this method requires separate heat exchange components (such as water-cooled plates or pipes) for each individual battery cell, leading to a larger number of heat exchange components, higher costs, and greater space occupation in the housing along the first direction, thus affecting the energy density of the battery device. Therefore, the solution proposed in this application is cost-effective, improves the space utilization of the battery device, and consequently increases its energy density.

[0128] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery devices.

[0129] 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.

[0130] 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.

[0131] 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.

[0132] 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.

[0133] 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.

[0134] 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.

[0135] 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 10 and a battery cell 21, with the battery cell 21 housed within the housing 10.

[0136] The housing 10 provides a space for accommodating the battery cell 21, and the housing 10 can adopt various structures. In some embodiments, the housing 10 may include a first housing body 12 and a second housing body 13, which overlap each other, and together define a space for accommodating the battery cell 21. The second housing body 13 covers the first housing body 12, so that the first housing body 12 and the second housing body 13 together define the space.

[0137] In the battery device 1, there can be multiple battery cells 21, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 21 are connected in both series and parallel configurations. Multiple battery cells 21 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 21 is housed within the housing 10. Alternatively, the battery device 1 can also consist of multiple battery cells 21 first connected in series, parallel, or in a mixed manner to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 10. The battery device 1 may also include other structures; for example, it may include a busbar component 26 for electrical connection between the multiple battery cells 21.

[0138] 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 21 includes a housing 215, an electrode assembly 216, and electrode terminals 214. The housing 215 includes a shell 2152 and an end cap 2151. The shell 2152 has an opening, and the end cap 2151 closes the opening to isolate the internal environment of the battery cell 21 from the external environment.

[0139] The housing 2152 is an assembly used to cooperate with the end cap 2151 to form the internal environment of the battery cell 21, wherein the formed internal environment can accommodate the electrode assembly 216, electrolyte, and other components. The housing 2152 and the end cap 2151 can be independent components. The housing 2152 can have various shapes and sizes. Specifically, the shape of the housing 2152 can be determined according to the specific shape and size of the electrode assembly 216. The housing 2152 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0140] End cap 2151 refers to a component that covers the opening of housing 2152 to isolate the internal environment of battery cell 21 from the external environment. The shape of end cap 2151 can be adapted to the shape of housing 2152 to fit it. Optionally, end cap 2151 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 2151 is not easily deformed under pressure and impact, giving battery cell 21 higher structural strength and improved reliability. Functional components such as electrode terminals can be provided on end cap 2151. Electrode terminals can be used for electrical connection with electrode assembly 216 to output or input electrical energy to battery cell 21. The material of end cap 2151 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment does not impose any special limitations on this. In some embodiments, an insulating structure may also be provided on the inner side of the end cap 2151. The insulating structure can be used to isolate the electrical connection components within the housing 2152 from the end cap 2151 to reduce the risk of short circuits. For example, the insulating structure may be made of plastic, rubber, etc.

[0141] Please refer to Figure 2 and refer to Figure 4 and Figure 5 , Figure 4 This is a schematic diagram of a battery device provided in some embodiments of this application. Figure 5 for Figure 4 A cross-sectional view of AA. This application provides a battery device 1. The battery device 1 includes a housing 10 and a battery cell assembly 20. The housing 10 has a dimension L1 along a first direction X and a dimension L2 along a second direction Y, satisfying 1000mm≤L1≤2300mm, 630mm≤L2≤780mm, and 0.27≤L2 / L1≤0.78. The battery cell assembly 20 is disposed within the housing 10 and includes a plurality of battery cells 21 stacked along the first direction X. Each battery cell 21 has a first surface 211 perpendicular to the first direction X, which is the surface with the largest area of ​​the battery cell 21. The battery cell assembly 20 has opposing first sides 22 and second sides 23 in a third direction Z, and opposing third sides 24 and fourth sides 25 in the second direction Y. The first direction X, the second direction Y, and the third direction Z are all perpendicular to each other, and the third direction Z is parallel to the direction of gravity. The housing 10 includes a thermal management component 11, which is thermally connected to at least two of the first side 22, the second side 23, the third side 24 and the fourth side 25. The interior of the thermal management component 11 has a flow channel 111 for containing the heat exchange medium.

[0142] 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 Y in the figure, and the third direction can be represented by the direction shown by the letter Z in the figure.

[0143] In some embodiments, the first direction X can be parallel to the length direction of the housing 10, the second direction Y can be parallel to the width direction of the housing 10, and the third direction Z can be parallel to the height direction of the housing 10.

[0144] In some embodiments, the first direction X, the second direction Y, and the third direction Z can be perpendicular to each other.

[0145] In some embodiments, the dimension L1 of the housing 10 in the first direction X satisfies the above conditions. L1 can be any value among 1000mm, 1200mm, 1400mm, 1600mm, 1800mm, 2000mm, 2200mm, and 2300mm, or a value between any two values.

[0146] In some embodiments, the dimension L2 of the housing 10 in the second direction Y satisfies the above conditions. L2 can be any value among 630mm, 650mm, 670mm, 690mm, 710mm, 730mm, 750mm, 770mm, and 780mm, or a value between any two values.

[0147] In some embodiments, the dimensions L1 of the housing 10 in the first direction X and L2 of the housing 10 in the second direction Y satisfy the above conditions. L2 / L1 can be any value from 0.27, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.78, or any value between any two values. For example, when L1 is 1000mm, L2 can be any value from 630mm or 780mm, or any value between any two values. When L1 is 2300mm, L2 can be any value from 630mm or 780mm, or any value between any two values.

[0148] When the battery device 1 provides power to the commercial vehicle, since the commercial vehicle has a large power demand and a large length, the size of the battery device 1 in the first direction X can be set to be large, wherein the first direction X can be parallel to the length direction of the commercial vehicle.

[0149] In some embodiments, the battery device 1 can be used to provide power to a commercial vehicle, or to provide power to other electrical devices.

[0150] In some embodiments, the battery cell 21 can be rectangular, and the battery cell 21 can have two first surfaces 211, two second surfaces 212, and two third surfaces 213. The two first surfaces 211 are arranged opposite each other along a first direction X, the two second surfaces 212 are arranged opposite each other along a third direction Z, and the two third surfaces 213 are arranged opposite each other along a second direction Y. The surface area of ​​the first surface 211 is larger than the surface area of ​​the second surface 212, and the surface area of ​​the first surface 211 is larger than the surface area of ​​the third surface 213.

[0151] In some embodiments, the housing 10 may include a thermal management component 11, which may include a heat exchange plate. The heat exchange plate may be a plate independent of the housing wall panel, or it may be a housing wall panel that makes up the housing 10. That is, the interior of the housing wall panel has a flow channel 111 for accommodating the heat exchange medium.

[0152] In some embodiments, the battery cell assembly 20 has a first side 22 and a second side 23 opposite to each other in the third direction Z, and a third side 24 and a fourth side 25 opposite to each other in the second direction Y. The thermal management assembly 11 is thermally connected to at least two of the first side 22, the second side 23, the third side 24 and the fourth side 25, that is, the thermal management assembly 11 is not directly thermally connected to the first surface 211.

[0153] In some embodiments, the thermal management component 11 may be thermally connected to the first side 22 and the second side 23.

[0154] In some embodiments, the thermal management component 11 may be thermally connected to the first side 22 and the third side 24.

[0155] In some embodiments, the thermal management component 11 may be thermally connected to the first side 22 and the fourth side 25.

[0156] In some embodiments, the thermal management component 11 may be thermally connected to the second side 23 and the third side 24.

[0157] In some embodiments, the thermal management component 11 may be thermally connected to the second side 23 and the fourth side 25.

[0158] In some embodiments, the thermal management component 11 may be thermally connected to the third side 24 and the fourth side 25.

[0159] In some embodiments, the thermal management component 11 may be thermally connected to the first side 22, the second side 23, and the third side 24.

[0160] In some embodiments, the thermal management component 11 may be thermally connected to the first side 22, the second side 23 and the fourth side 25.

[0161] In some embodiments, the thermal management component 11 may be thermally connected to the first side 22, the third side 24, and the fourth side 25.

[0162] In some embodiments, the thermal management component 11 may be thermally connected to the second side 23, the third side 24, and the fourth side 25.

[0163] In some embodiments, the thermal management component 11 may be thermally connected to the first side 22, the second side 23, the third side 24, and the fourth side 25.

[0164] In some embodiments, the heat exchange medium can be a cooling medium, such as a coolant, used to cool the battery cell assembly 20.

[0165] In some embodiments, the heat exchange medium can be a medium with a higher temperature, used to heat up the battery cell assembly 20.

[0166] In some embodiments, when the thermal management component 11 is thermally connected to one side of the battery cell assembly 20, the thermal management component 11, which is used to thermally connect to one side of the battery cell assembly 20, can be thermally connected to at least two battery cells 21 at the same time.

[0167] For example, the thermal management component 11 may include multiple water-cooled plates. When one of the water-cooled plates is thermally connected to the first side 22 of the battery cell assembly 20, the water-cooled plate can be thermally connected to the surfaces of multiple battery cells 21 located on the first side 22 at the same time.

[0168] In some embodiments, thermally conductive adhesive may be provided between the thermal management component 11 and the battery cell assembly 20 to improve the thermal conductivity between the thermal management component 11 and the battery cell assembly 20.

[0169] In some embodiments, the first box body 12 and the second box body 13 can be made of various materials. The first box body 12 and the second box body 13 can be made of non-metallic materials, such as polymer composite materials. Of course, the first box body 12 and the second box body 13 can also be made of metallic materials, such as aluminum, aluminum alloy, or steel. Similarly, the materials of the first box body 12 and the second box body 13 can be the same or different.

[0170] In the technical solution of this application embodiment, the battery cells 21 are stacked along the first direction X, and the dimensions of the housing 10 in the first direction X and the dimensions in the second direction Y satisfy the above conditions, resulting in a large number of battery cells 21. Through thermally conductive connections between the thermal management component 11 and at least two of the first side 22, second side 23, third side 24, and fourth side 25, the thermal management component 11 can effectively manage the temperature of the battery cells 21, reducing the risk of the battery cell temperature affecting the charging and discharging efficiency, and thus improving the reliability of the battery device 1. Meanwhile, the first surface 211 is perpendicular to the stacking direction of the multiple battery cells 21. Compared with the thermal management component 11 being thermally connected to the first surface 211 of the battery cells 21, the thermal connection to the first surface 211 requires the separate provision of heat exchange components (such as water-cooled plates, water-cooled pipes, etc.) that are thermally connected to the first surface 211 of each battery cell 21. This results in a larger number of heat exchange components, higher costs, and occupies more space in the first direction X of the housing 10, affecting the energy density of the battery device 1. Therefore, the solution of this application is beneficial for saving costs and improving the space utilization of the battery device 1, thereby improving the energy density of the battery device 1.

[0171] Please refer to Figure 5 In some embodiments, the thermal management component 11 is thermally connected to at least three of the first side 22, the second side 23, the third side 24, and the fourth side 25.

[0172] In some embodiments, the thermal management component 11 may be thermally connected to the first side 22, the second side 23, and the third side 24.

[0173] In some embodiments, the thermal management component 11 may be thermally connected to the first side 22, the second side 23 and the fourth side 25.

[0174] In some embodiments, the thermal management component 11 may be thermally connected to the first side 22, the third side 24, and the fourth side 25.

[0175] In some embodiments, the thermal management component 11 may be thermally connected to the second side 23, the third side 24, and the fourth side 25.

[0176] The technical solution of this application embodiment, through thermally conductive connection of the thermal management component 11 to at least three of the first side 22, the second side 23, the third side 24, and the fourth side 25, enables the thermal management component 11 to better manage the temperature of the battery cell 21, reducing the risk of the battery cell 21 temperature affecting the charging and discharging efficiency, and thus improving the reliability of the battery device 1. Furthermore, compared to thermally conductive connection between the thermal management component 11 and the first surface 211 of the battery cell 21, the solution of this application is more cost-effective, improves the space utilization of the battery device 1, and thereby increases the energy density of the battery device 1.

[0177] Please refer to Figure 5 In some embodiments, the thermal management component 11 is thermally connected to the first side 22, the second side 23, the third side 24, and the fourth side 25.

[0178] The technical solution of this application embodiment, through the thermal management component 11 being thermally connected to the first side 22, the second side 23, the third side 24, and the fourth side 25, enables the thermal management component 11 to better manage the temperature of the battery cell 21, reducing the risk of the battery cell 21 temperature affecting the charging and discharging efficiency, and thus improving the reliability of the battery device 1. Furthermore, compared to the thermal management component 11 being thermally connected to the first surface 211 of the battery cell 21, the solution of this application is more cost-effective, improves the space utilization of the battery device 1, and consequently increases the energy density of the battery device 1.

[0179] Please refer to Figure 2 In some embodiments, the housing 10 includes a first housing body 12 and a second housing body 13. The first housing body 12 includes a bottom plate 121, which has a bearing surface 1211 on one side in the third direction Z, for supporting the battery cell assembly 20 in the third direction Z. The second housing body 13, together with the first housing body 12, defines an assembly space 14 for accommodating the battery cell assembly 20. The second housing body 13 includes a top plate 131 and two first side wall panels 132. The top plate 131 and the bottom plate 121 are arranged opposite each other in the third direction Z, and the two first side wall panels 132 are arranged opposite each other in the second direction Y. One end of the first side wall panel 132 in the third direction Z is connected to the top plate 131.

[0180] In some embodiments, the housing 10 may include a first housing body 12 and a second housing body 13. The bottom plate 121 of the first housing body 12 is used to support the battery cell assembly 20. That is, the first housing body 12 may be the lower part of the housing 10, and the second housing body 13 may be the upper part of the housing 10.

[0181] In some embodiments, the first housing body 12 includes a base plate 121, which has a bearing surface 1211 on one side in the third direction Z. The thickness direction of the base plate 121 can be parallel to the third direction Z, that is, the thickness direction of the base plate 121 can be parallel to the direction of gravity. The bearing surface 1211 can be the surface of the base plate 121 facing the battery cell assembly 20.

[0182] In some embodiments, the battery cell assembly 20 is disposed on the base plate 121 along the third direction Z, and the base plate 121 is disposed at the bottom of the battery cell assembly 20 so that the bottom can support the battery cell assembly 20.

[0183] In some embodiments, the top plate 131 is connected to two first side wall panels 132. The two first side wall panels 132 can be arranged opposite each other along the second direction Y, wherein the two first side wall panels 132 can be disposed at both ends of the top plate 131 in the second direction Y, and the two first side wall panels 132 can be two opposite side beams of the box body 10 in the second direction Y, that is, the two first side wall panels 132 can be the two outermost components of the box body 10 in the second direction Y.

[0184] In some embodiments, the first sidewall panel 132 may extend along a third direction Z. In the third direction Z, one end of the first sidewall panel 132 is connected to the top plate 131, and the other end is connected to the first box body 12, such as the bottom plate 121 of the first box body 12, or other sidewall panels of the first box body 12.

[0185] The technical solution of this application embodiment defines an assembly space 14 for accommodating the battery cell assembly 20 by the first box body 12 and the second box body 13, which helps to reduce the risk of damage to the battery cell assembly 20 and thus improves the reliability of the battery device 1.

[0186] Please refer to Figure 2 In some embodiments, the first box body 12 further includes two second side wall panels 122, which are arranged opposite each other along the second direction Y. The second side wall panels 122 are connected to the bottom plate 121 and protrude from the bearing surface 1211. The first side wall panel 132 is connected to the second side wall panels 122.

[0187] In some embodiments, two second sidewall panels 122 are disposed opposite each other along a second direction Y. In a third direction Z, one end of the second sidewall panel 122 is connected to the base plate 121, and the other end is connected to the first sidewall panel 132. One first sidewall panel 132 is connected to one second sidewall panel 122, and the other first sidewall panel 132 is connected to the other second sidewall panel 122.

[0188] In some embodiments, the second sidewall panel 122 is connected to the base plate 121 and protrudes from the bearing surface 1211. That is, the second sidewall panel 122 of the first box body 12 is connected to the base plate 121 and extends beyond the bearing surface 1211 of the base plate 121 in the direction of the third direction Z along the base plate 121 toward the battery cell assembly 20.

[0189] In some embodiments, with the third direction Z as the projection direction, the orthographic projection of the first sidewall panel 132 can overlap with the orthographic projection of the second sidewall panel 122.

[0190] In some embodiments, with the third direction Z as the projection direction, the orthographic projection of the first sidewall panel 132 can completely overlap with the orthographic projection of the second sidewall panel 122.

[0191] In some embodiments, the two second sidewall panels 122 may be arranged opposite each other along the second direction Y, wherein the two second sidewall panels 122 may be disposed at both ends of the bottom plate 121 in the second direction Y, and the two second sidewall panels 122 may be two side beams opposite each other of the box body 10 in the second direction Y, that is, the two second sidewall panels 122 may be the two outermost components of the box body 10 in the second direction Y.

[0192] In some embodiments, the second sidewall panel 122 and the bottom plate 121 can be separate structures, with one end of the bottom plate 121 connected to the second sidewall panel 122 in the second direction Y, and the second sidewall panel 122 protruding along the third direction Z from the bearing surface 1211 of the bottom plate 121 facing the assembly space 14.

[0193] The technical solution of this application embodiment connects the first box body 12 and the second box body 13 by connecting the first side wall panel 132 to the second side wall panel 122, which helps to improve the convenience of connecting the first box body 12 and the second box body 13.

[0194] Please refer to Figure 2 In some embodiments, along the third direction Z, the second sidewall 122 protrudes from the bearing surface 1211 by a dimension less than one-quarter of the maximum dimension of the first sidewall 132.

[0195] It should be noted that among the multiple side wall panels of the first box body 12, the side wall panel whose size protruding from the bearing surface 1211 is less than one-quarter of the maximum size of the first side wall panel 132 is the second side wall panel 122. The first box body 12 may include other side wall panels, and the size of the other side wall panels protruding from the bearing surface 1211 may be greater than one-quarter of the maximum size of the first side wall panel 132.

[0196] The technical solution of this application embodiment, along the third direction Z, sets the size of the second sidewall panel 122 protruding from the bearing surface 1211 to be less than one-quarter of the maximum size of the first sidewall panel 132. This makes the size of the second sidewall panel 122, which is used for assembly and connection between the first housing body 12 and the second housing body 13, smaller. This is beneficial for optimizing the size of the first housing body 12 in the first direction X, and can reduce the binding force of the first housing body 12 on the second housing body 13. This reduces the assembly difficulty between the first housing body 12 and the target component, and also reduces the difficulty of assembling the battery cell 21 onto the bearing plate, thereby reducing the assembly difficulty of the battery device 1. At the same time, since the first housing body 12 is used to support the battery cell assembly 20, it requires high structural strength and has a high cost. When the size of the housing 10 in the third direction Z remains unchanged, the smaller size of the second sidewall panel 122 helps to reduce the cost of the first housing body 12.

[0197] Please refer to Figure 2 and Figure 5 In some embodiments, the thermal management assembly 11 includes a base plate 121 thermally connected to a first side 22, the interior of the base plate 121 having a first flow channel 1212 for accommodating a heat exchange medium, and the base plate 121 being configured to manage the temperature of at least two battery cells 21 in the battery cell assembly 20.

[0198] In some embodiments, the base plate 121 may be part of the thermal management assembly 11. The battery cell assembly 20 may have a first side 22 and a second side 23 opposite each other in the third direction Z, wherein the first side 22 may be located below the second side 23. The base plate 121 may be thermally connected to the first side 22.

[0199] In some embodiments, the base plate 121 may be a solid plate, and the first flow channel 1212 may be formed by milling or integral extrusion.

[0200] In some embodiments, the base plate 121 may be composed of multiple plates connected together to form the base plate 121, and a first flow channel 1212 may be formed inside the base plate 121.

[0201] In some embodiments, the battery cell 21 may have a bottom surface in the third direction Z, and the base plate 121 may contact the bottom surfaces of at least two battery cells 21. Alternatively, the base plate 121 may contact the bottom surfaces of all battery cells 21.

[0202] The technical solution of this application embodiment achieves heat exchange between the base plate 121 and the battery cell assembly 20 by forming a first flow channel 1212 inside the base plate 121 to accommodate the heat exchange medium, which helps to improve the reliability of the battery device 1.

[0203] Please refer to Figure 2 In some embodiments, the first box body 12 further includes a third side wall panel 123 and a fourth side wall panel 124, which are arranged opposite to each other along the first direction X. Both the third side wall panel 123 and the fourth side wall panel 124 are connected to the bearing surface 1211, and both the third side wall panel 123 and the fourth side wall panel 124 are connected to the second box body 13.

[0204] In some embodiments, the first housing body 12 may include a third side wall panel 123 and a fourth side wall panel 124, which may be arranged opposite to each other along a first direction X. In the first direction X, the battery cell assembly 20 may be located between the third side wall panel 123 and the fourth side wall panel 124, and the third side wall panel 123 and the fourth side wall panel 124 may be respectively connected to the two ends of the base plate 121 in the first direction X.

[0205] In the third direction Z, one end of the third side wall panel 123 is connected to the bottom plate 121, and the other end is connected to the top plate 131; one end of the fourth side wall panel 124 is connected to the bottom plate 121, and the other end is connected to the top plate 131. That is, the third side wall panel 123 and the fourth side wall panel 124 can be two opposite side beams of the box body 10 in the first direction X, that is, the third side wall panel 123 and the fourth side wall panel 124 can be the two outermost components of the box body 10 in the first direction X.

[0206] In some embodiments, the third side wall panel 123, the fourth side wall panel 124 and the bottom plate 121 can be a separate structure, with the third side wall panel 123 and the fourth side wall panel 124 protruding along the third direction Z from the bearing surface 1211 of the bottom plate 121 facing the assembly space 14.

[0207] The two first side wall panels 132 of the second box body 13 are respectively connected to the two ends of the top plate 131 in the second direction Y, so that the cross section of the second box body 13 perpendicular to the first direction X is a "U" shaped structure, and the two ends of the second box body 13 in the first direction X are open structures.

[0208] Correspondingly, the third side wall panel 123 and the fourth side wall panel 124, which are arranged opposite each other in the first direction X, are used to block the two ends of the second box body 13 in the first direction X. That is, the third side wall panel 123, which is connected to the side of the bottom plate 121 facing the top plate 131, is connected to the top plate 131 and also to the two first side wall panels 132. The fourth side wall panel 124, which is connected to the side of the bottom plate 121 facing the top plate 131, is connected to the top plate 131 and also to the two first side wall panels 132, so that the cross section of the first box body 12 perpendicular to the second direction Y is also U-shaped.

[0209] The technical solution of this application embodiment connects the second box body 13 through the third side wall plate 123 and the fourth side wall plate 124 of the first box body 12, so as to realize the mutual connection between the two sides of the first box body 12 and the second box body 13 in the third direction Z, thereby realizing the assembly connection between the first box body 12 and the second box body 13 and jointly defining the assembly space 14 for accommodating the battery cell 21. The structure is simple and easy to assemble.

[0210] Please refer to Figure 2 In some embodiments, the first housing body 12 further includes a first expansion beam 125, which is connected to the bearing surface 1211, and one end of the battery cell assembly 20 in the first direction X abuts against the first expansion beam 125.

[0211] In some embodiments, the first box body 12 may include a first expansion beam 125, which may be connected to the bearing surface 1211. The first expansion beam 125 may be located between the third side wall panel 123 and the fourth side wall panel 124. In the first direction X, the distance between the first expansion beam 125 and the third side wall panel 123 may be less than the distance between the first expansion beam 125 and the fourth side wall panel 124, meaning the first expansion beam 125 is closer to the third side wall panel 123.

[0212] In some embodiments, the first expansion beam 125 abuts against one end of the battery cell assembly 20 in the first direction X, wherein the first expansion beam 125 abuts against the battery cell 21 at that end, that is, the first expansion beam 125 abuts against the first surface 211 of the battery cell 21 at that end.

[0213] In the first direction X, one end of the battery cell assembly 20 can abut against the first expansion beam 125, and the other end can abut against the fourth side wall panel 124.

[0214] Alternatively, the first housing body 12 may also include a second expansion beam 126, and along the first direction X, a third side wall panel 123, a first expansion beam 125, a second expansion beam 126, and a fourth side wall panel 124 may be arranged sequentially. The battery cell assembly 20 may be located between the first expansion beam 125 and the second expansion beam 126. In the first direction X, both ends of the battery cell assembly 20 may abut against the first expansion beam 125 and the second expansion beam 126, respectively.

[0215] When the battery cell 21 is charging or discharging, it may expand, especially on the surface with the largest area of ​​the battery cell 21. That is, the first surface 211 tends to expand outward in a direction away from the center line of the battery cell 21 in the first direction X. The first expansion beam 125 abuts against the first surface 211 of the battery cell 21 to resist the expansion force of the battery cell 21.

[0216] The technical solution of this application embodiment, by setting the first expansion beam 125 to abut against one end of the battery cell assembly 20 in the first direction X, is beneficial to resist the expansion force of the battery cell 21.

[0217] Please refer to Figure 2 and Figure 5 and refer to Figure 6 , Figure 6This 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 123, the first expansion beam 125, the battery cell assembly 20, and the fourth sidewall panel 124 are arranged sequentially along the first direction X. The bottom plate 121 is provided with a first medium inlet 1213 and a first medium outlet 1214 communicating with the first flow channel 1212. The first medium inlet 1213 and the first medium outlet 1214 are both located between the first expansion beam 125 and the third sidewall panel 123.

[0218] In some embodiments, along the first direction X, the third side wall panel 123, the first expansion beam 125, the battery cell assembly 20 and the fourth side wall panel 124 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 125 and the third side wall panel 123.

[0219] In some embodiments, the base plate 121 is provided with a first medium inlet 1213 and a first medium outlet 1214, wherein the first medium inlet 1213 and the first medium outlet 1214 can be pipes, which can extend along the third direction Z. One end of the pipe is connected to the first flow channel 1212, and the other end protrudes from the bearing surface 1211 in the third direction Z, so as to connect with the connecting pipe for conveying the heat exchange medium.

[0220] In some embodiments, the first medium inlet 1213 and the first medium outlet 1214 may be disposed between the third side wall panel 123 and the first expansion beam 125, sharing space with other electrical components, which is beneficial to improving the space utilization of the battery device 1.

[0221] In some embodiments, the first medium inlet 1213 and the first medium outlet 1214 may be spaced apart along the second direction Y.

[0222] In some embodiments, the heat exchange medium enters the first flow channel 1212 through the first medium inlet 1213 and flows out through the first medium outlet 1214, thereby realizing the circulation of the heat exchange medium in the first flow channel 1212.

[0223] The technical solution of this application embodiment arranges the first medium inlet 1213 and the first medium outlet 1214 between the first expansion beam 125 and the third side wall plate 123, which reduces the risk of interference between the first medium inlet 1213 and the first medium outlet 1214 and the battery cell assembly 20, and helps to improve the reliability of the battery device 1.

[0224] Please refer to Figure 2 , Figure 5 and Figure 6In some embodiments, the thermal management assembly 11 further includes a first connector 112 and a second connector 113, which are respectively disposed on the third side wall plate 123. The thermal management assembly 11 also includes a first connecting pipe 114 and a second connecting pipe 115, which are both located between the first expansion beam 125 and the third side wall plate 123. The first connecting pipe 114 connects the first medium inlet 1213 and the first connector 112, and the second connecting pipe 115 connects the first medium outlet 1214 and the second connector 113.

[0225] In some embodiments, the thermal management assembly 11 may include a first connector 112 and a second connector 113. The first connector 112 and the second connector 113 may be pipes passing through a third sidewall panel 123. One end of the pipe is located on the side of the third sidewall panel 123 facing the first expansion beam 125. A first connecting pipe 114 connects this end of the first connector 112 to a first medium inlet 1213, and a second connecting pipe 115 connects this end of the second connector 113 to a first medium outlet 1214. The other end of the pipe is located on the side of the third sidewall panel 123 away from the first expansion beam 125 to facilitate communication with an external container. External heat exchange medium is transported to the first flow channel 1212 through the first connector 112, and the heat exchange medium in the first flow channel 1212 is discharged from the battery device 1 through the second connector 113.

[0226] In some embodiments, the first connecting pipe 114 and the second connecting pipe 115 may be made of plastic hose, metal hose, metal rigid pipe, etc.

[0227] In some embodiments, the materials of the first connecting pipe 114 and the second connecting pipe 115 may be the same or different.

[0228] The technical solution of this application embodiment connects the first medium inlet 1213 and the first connector 112 via a first connecting pipe 114, and the second connecting pipe 115 connects the first medium outlet 1214 and the second connector 113, thereby realizing the circulation of the heat exchange medium in the first flow channel 1212, which is beneficial for the base plate 121 to manage the temperature of the battery cell assembly 20. At the same time, the first connecting pipe 114 and the second connecting pipe 115 are located between the first expansion beam 125 and the third side wall plate 123, reducing the risk of interference between the first connecting pipe 114 and the second connecting pipe 115 and the battery cell assembly 20, and improving the reliability of the battery device 1.

[0229] Please refer to Figure 2 In some embodiments, the first housing body 12 further includes a second expansion beam 126, which is connected to the base plate 121 and is disposed opposite to the first expansion beam 125 along the first direction X. The two ends of the battery cell assembly 20 abut against the first expansion beam 125 and the second expansion beam 126, respectively.

[0230] In some embodiments, along the first direction X, the third sidewall 123, the first expansion beam 125, the second expansion beam 126, and the fourth sidewall 124 can be arranged sequentially, and the battery cell assembly 20 can be located between the first expansion beam 125 and the second expansion beam 126. In the first direction X, both ends of the battery cell assembly 20 can respectively abut against the first expansion beam 125 and the second expansion beam 126.

[0231] In some embodiments, the first expansion beam 125 abuts against one end of the battery cell assembly 20 in the first direction X, wherein the first expansion beam 125 abuts against the battery cell 21 at that end, that is, the first expansion beam 125 abuts against the first surface 211 of the battery cell 21 at that end.

[0232] The second expansion beam 126 abuts against the other end of the battery cell assembly 20 in the first direction X, wherein the second expansion beam 126 abuts against the battery cell 21 at that end, that is, the second expansion beam 126 abuts against the first surface 211 of the battery cell 21 at that end.

[0233] In some embodiments, a portion of the plurality of electrical components may be disposed between the first expansion beam 125 and the third sidewall 123, and another portion may be disposed between the second expansion beam 126 and the fourth sidewall 124.

[0234] In some embodiments, multiple electrical components may be disposed between the first expansion beam 125 and the third sidewall 123.

[0235] In some embodiments, in the first direction X, the distance between the first expansion beam 125 and the third side wall plate 123 may be greater than the distance between the second expansion beam 126 and the fourth side wall plate 124.

[0236] In some embodiments, the connection between the first expansion beam 125 and the base plate 121 can be by bonding, welding, integral molding, etc.

[0237] In some embodiments, the connection between the second expansion beam 126 and the base plate 121 can be by bonding, welding, integral molding, etc.

[0238] In some embodiments, the way in which the first expansion beam 125 and the base plate 121 are connected can be the same as or different from the way in which the second expansion beam 126 and the base plate 121 are connected.

[0239] The technical solution of this application embodiment, by setting the first expansion beam 125 and the second expansion beam 126 to abut against the two ends of the battery cell assembly 20 in the first direction X, is beneficial to resist the expansion force of the battery cell 21.

[0240] Please refer to Figure 7 , Figure 7 This is an exploded view of the structure of a battery device provided in some other embodiments of this application. In some embodiments, there are multiple battery cell assemblies 20, which are arranged along the second direction Y. The first housing body 12 also includes a partition plate 127, which is disposed between two adjacent battery cell assemblies 20. In the first direction X, the two ends of the partition plate 127 are respectively connected to a first expansion beam 125 and a second expansion beam 126.

[0241] In some embodiments, the number of battery cell modules 20 can be multiple, and the multiple battery cell modules 20 can be connected in parallel or in series.

[0242] In some embodiments, a plurality of battery cell assemblies 20 may be arranged along a second direction Y, wherein the thickness direction of the separator 127 may be parallel to the second direction Y, and the separator 127 may be disposed between two adjacent battery cell assemblies 20.

[0243] Taking two battery cell modules 20 as an example, the number of separators 127 can be one, with the separator 127 located between the two battery cell modules 20.

[0244] Taking a scenario where there are three battery cell modules 20, the number of separator plates 127 can be two. The two separator plates 127 are arranged at intervals along the second direction Y. Along the second direction Y, a first side wall plate 132, a first battery cell module 20, a separator plate 127, a second battery cell module 20, another separator plate 127, a third battery cell module 20, and another first side wall plate 132 are arranged sequentially.

[0245] In some embodiments, the number of battery cell assemblies 20 is two.

[0246] In some embodiments, the partition plate 127 may extend along a first direction X, and the two ends of the partition plate 127 in the first direction X may be connected to the first expansion beam 125 and the second expansion beam 126 respectively.

[0247] In some embodiments, the partition plate 127 can be connected to the first expansion beam 125 by bonding, welding, integral molding, etc.

[0248] In some embodiments, the partition plate 127 can be connected to the second expansion beam 126 by bonding, welding, integral molding, etc.

[0249] In some embodiments, the way in which the partition plate 127 connects to the first expansion beam 125 can be the same as or different from the way in which the partition plate 127 connects to the second expansion beam 126.

[0250] During charging and discharging, the battery cell 21 expands, and the first expansion beam 125 and the second expansion beam 126 resist the expansion force of the battery cell 21. The two ends of the separator 127 are respectively connected to the first expansion beam 125 and the second expansion beam 126, so that in the first direction X, the first expansion beam 125 and the second expansion beam 126 are respectively subjected to the tensile force from the separator 127, which helps to improve the reliability of the first expansion beam 125 and the second expansion beam 126 in resisting the expansion of the battery cell 21.

[0251] The technical solution of this application embodiment reduces the risk of interference between two adjacent battery cell assemblies 20 by placing a separator 127 between them. Simultaneously, the separator 127 connects the first expansion beam 125 and the second expansion beam 126, which helps improve the reliability of the first expansion beam 125 and the second expansion beam 126 in resisting the expansion beam of the battery cell 21.

[0252] Please refer to Figure 7 and refer to Figure 8 , Figure 8 This is a schematic diagram of the internal structure of a battery device provided in some other embodiments of this application. In some embodiments, the thermal management assembly 11 further includes a partition plate 127, the interior of which is formed a second flow channel 1271 for receiving a heat exchange medium, and the partition plate 127 is configured to manage the temperature of at least two battery cells 21 in the battery cell assembly 20.

[0253] In some embodiments, the separator 127 may be part of the thermal management assembly 11. The battery cell assembly 20 may have opposing third sides 24 and fourth sides 25 in the second direction Y. Taking two battery cell assemblies as an example, the third side 24 of one battery cell assembly 20 may be disposed opposite to the fourth side 25 of the other battery cell assembly 20. In the second direction Y, the separator 127 may have two opposing surfaces, one surface of which may be thermally connected to the third side 24 of one battery cell assembly 20, and the other surface may be thermally connected to the fourth side 25 of the other battery cell assembly 20.

[0254] In some embodiments, the partition plate 127 may be a solid plate, and the second flow channel 1271 may be formed by milling or integral extrusion.

[0255] In some embodiments, the partition plate 127 may be composed of multiple plates connected to form the partition plate 127, and a second flow channel 1271 may be formed inside the partition plate 127.

[0256] In some embodiments, the battery cell 21 may have a side surface in the second direction Y, and the separator 127 may contact the side surface of at least two battery cells 21 of a battery cell assembly 20. Alternatively, the separator 127 may contact the side surface of all battery cells 21 of a battery cell assembly 20.

[0257] The technical solution of this application embodiment achieves heat exchange between the separator 127 and the battery cell assembly 20 by forming a second flow channel 1271 inside the separator 127 for accommodating the heat exchange medium, which helps to improve the reliability of the battery device 1.

[0258] Please refer to Figure 7 and Figure 8 And refer to 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 121 includes a first sub-base plate 1215, a second sub-base plate 1216, and a third sub-base plate 1217 arranged sequentially. The first sub-base plate 1215 is connected to the first expansion beam 125 and the third side wall plate 123. A bearing surface 1211 is disposed on the second sub-base plate 1216. A first flow channel 1212 is formed inside the second sub-base plate 1216. The third sub-base plate 1217 is connected to the second expansion beam 126 and the fourth side wall plate 124. The partition plate 127 is connected to the second sub-base plate 1216.

[0259] In some embodiments, along the first direction X, the base plate 121 may include a first sub-base plate 1215, a second sub-base plate 1216 and a third sub-base plate 1217 arranged sequentially.

[0260] The first sub-base plate 1215 is connected to the first expansion beam 125 and the third side wall plate 123. The first sub-base plate 1215 can be welded to the first expansion beam 125 and the third side wall plate 123, or the first sub-base plate 1215 can be integrally formed with the first expansion beam 125 and the third side wall plate 123.

[0261] The third sub-base plate 1217 is connected to the second expansion beam 126 and the fourth side wall plate 124. The third sub-base plate 1217 can be welded to the second expansion beam 126 and the fourth side wall plate 124, or the third sub-base plate 1217 can be integrally formed with the second expansion beam 126 and the fourth side wall plate 124.

[0262] In some embodiments, the bearing surface 1211 may be disposed on the second sub-base plate 1216, that is, the second sub-base plate 1216 bears the battery cell assembly 20. With the third direction Z as the projection direction, the orthographic projection of the second sub-base plate 1216 can cover the orthographic projection of the battery cell assembly 20.

[0263] In some embodiments, the partition plate 127 can be connected to the second sub-base plate 1216. The connection method between the partition plate 127 and the second sub-base plate 1216 can be bonding, welding, integral molding, etc.

[0264] The technical solution of this application embodiment connects the first sub-base plate 1215 to the first expansion beam 125 and the third side wall plate 123, the third sub-base plate 1217 to the second expansion beam 126 and the fourth side wall plate 124, and the second sub-base plate 1216 to the first sub-base plate 1215 and the third sub-base plate 1217, which facilitates the connection of the first expansion beam 125, the third side wall plate 123, the second expansion beam 126 and the fourth side wall plate 124 to the base plate 121.

[0265] Please refer to Figures 7 to 9 In some embodiments, the second sub-base plate 1216 includes a first portion 12161, a second portion 12162 and a third portion 12163 arranged along the second direction Y. The second portion 12162 is integrally formed with the partition plate 127, and the first portion 12161 and the third portion 12163 are connected through the second portion 12162.

[0266] In some embodiments, the second sub-base plate 1216 may include a first portion 12161, a second portion 12162, and a third portion 12163 arranged along the second direction Y, wherein the thickness direction of the first portion 12161, the thickness direction of the second portion 12162, and the thickness direction of the third portion 12163 are all parallel to the third direction Z.

[0267] In some embodiments, the second part 12162 and the partition plate 127 are integrally formed, wherein the thickness direction of the second part 12162 may be parallel to the third direction Z, and the thickness direction of the partition plate 127 may be parallel to the second direction Y, that is, the partition plate 127 and the second part 12162 integrally formed may be in an inverted "T" shape.

[0268] In some embodiments, the interior of the first portion 12161 and the interior of the third portion 12163 may both have grooves, and the interior of the second portion 12162 has a channel. The second portion 12162 connects the first portion 12161 and the third portion 12163, and the channel of the second portion 12162 connects the groove of the first portion 12161 and the groove of the third portion 12163, so that the first portion 12161, the second portion 12162 and the third portion 12163 together form the first flow channel 1212.

[0269] The first medium outlet 1214 can be connected to the groove of the first part 12161, and the first medium inlet 1213 can be connected to the groove of the third part 12163.

[0270] In some embodiments, the second flow channel 1271 inside the partition plate 127 may communicate with the channel of the second portion 12162, so that the second flow channel 1271 of the partition plate 127 communicates with the first flow channel 1212 of the second sub-base plate 1216.

[0271] The technical solution of this application embodiment is that the second part 12162 is integrally formed with the partition plate 127, and the first part 12161 and the third part 12163 are connected through the second part 12162, which facilitates the connection between the partition plate 127 and the bottom plate 121.

[0272] Please refer to Figure 9 and refer to Figure 10 , Figure 10 for Figure 9 Enlarged view at point B. In some embodiments, the first expansion beam 125 is provided with a through hole 1251, which extends through the first expansion beam 125 along the first direction X, and the partition plate 127 passes through the through hole 1251. The partition plate 127 is provided with a second medium inlet 1272 and a second medium outlet 1273 communicating with the second flow channel 1271. The second medium outlet 1273 and the second medium inlet 1272 are both located on the side of the first expansion beam 125 away from the battery cell assembly 20.

[0273] In some embodiments, the first expansion beam 125 may be provided with a through hole 1251 extending through the first expansion beam 125 along the first direction X, and the partition plate 127 is disposed in the through hole 1251 such that a portion of the partition plate 127 is located between the first expansion beam 125 and the second expansion beam 126, and another portion is located between the first expansion beam 125 and the third side wall plate 123.

[0274] The second medium inlet 1272 and the second medium outlet 1273 may be disposed in another part of the partition plate 127, such that the second medium inlet 1272 and the second medium outlet 1273 are located between the first expansion beam 125 and the third side wall plate 123.

[0275] In some embodiments, the thermal management component 11 may include a third connecting pipe and a fourth connecting pipe. The third connecting pipe may connect the second medium inlet 1272 and the first connector 112, and the fourth connecting pipe may connect the second medium outlet 1273 and the second connector 113, so that the heat exchange medium enters the second flow channel 1271 through the second medium inlet 1272 from the first connector 112, and is discharged from the battery device 1 through the second connector 113 from the second medium outlet 1273.

[0276] It should be noted that the first connector 112 may have multiple interfaces, the first connecting tube 114 is connected to one of the interfaces of the first connector 112, and the third connecting tube is connected to another interface of the first connector 112.

[0277] Similarly, the second connector 113 may have multiple interfaces, with the second connecting pipe 115 connected to one of the interfaces of the second connector 113 and the fourth connecting pipe connected to another interface of the second connector 113.

[0278] In some embodiments, since the thickness of the separator 127 is small, the second medium outlet 1273 and the second medium inlet 1272 can be spaced apart along the third direction Z.

[0279] In some embodiments, the second medium outlet 1273 and the second medium inlet 1272 can be pipes that extend along a first direction X. One end of the pipe extends into the interior of the partition plate 127 and communicates with the second flow channel 1271, while the other end of the pipe extends out to facilitate connection with the third and fourth connecting pipes.

[0280] The technical solution of this application embodiment, by providing a through hole 1251 in the first expansion beam 125 and having the partition plate 127 pass through the through hole 1251, facilitates the connection between the partition plate 127 and the first expansion beam 125, thereby improving the reliability of the connection between the partition plate 127 and the first expansion beam 125. Simultaneously, the partition plate 127 passing through the through hole 1251 ensures that the second medium inlet 1272 and the second medium outlet 1273 are located on the side of the first expansion beam 125 away from the battery cell assembly 20, thereby reducing the risk of interference between the second medium inlet 1272 and the second medium outlet 1273 and the battery cell assembly 20, and improving the reliability of the battery device 1.

[0281] Please refer to Figure 9 and refer to Figure 11 , Figure 11 for Figure 9 Enlarged view at point C. In some embodiments, a connecting block 1274 is provided at one end of the partition plate 127 away from the first expansion beam 125, and a groove 1261 is provided on the side of the second expansion beam 126 facing the first expansion beam 125. At least a portion of the connecting block 1274 is embedded in the groove 1261 to restrict the partition plate 127 from disengaging from the second expansion beam 126.

[0282] In some embodiments, the connecting block 1274 may be disposed at one end of the partition plate 127 opposite to the first expansion beam 125. The connecting block 1274 can be regarded as a limiting structure formed at one end of the partition plate 127 opposite to the first expansion beam 125. The connecting block 1274 is used to cooperate with the second expansion beam 126 to restrict the partition plate 127 from disengaging from the second expansion beam 126.

[0283] In some embodiments, the contours of the groove 1261 and the connecting block 1274 can match, facilitating the assembly and positioning of the partition plate 127 and the second expansion beam 126. When the partition plate 127 is assembled with the first expansion beam 125 and the second expansion beam 126, at least a portion of the connecting block 1274 is embedded in the groove 1261, and the partition plate 127 is connected to the first expansion beam 125 and the second expansion beam 126.

[0284] The technical solution of this application embodiment is that the connecting block 1274 of the partition plate 127 is disposed in the groove 1261 of the second expansion beam 126, which facilitates the connection between the partition plate 127 and the second expansion beam 126 and helps to improve the reliability of the connection between the partition plate 127 and the second expansion beam 126.

[0285] Please refer to Figure 2 and Figure 5 In some embodiments, the thermal management assembly 11 includes a top plate 131 thermally connected to the second side 23, and the interior of the top plate 131 has a third flow channel 1311 for containing a heat exchange medium. The top plate 131 is configured to manage the temperature of at least two battery cells 21 in the battery cell assembly 20.

[0286] In some embodiments, the top plate 131 may be part of the thermal management assembly 11. The battery cell assembly 20 may have a first side 22 and a second side 23 opposite each other in the third direction Z, the second side 23 may be located above the first side 22, and the top plate 131 may be thermally connected to the second side 23 of the battery cell assembly 20.

[0287] In some embodiments, the top plate 131 may be a solid plate, and the third flow channel 1311 may be formed by milling or integral extrusion.

[0288] In some embodiments, the top plate 131 may be composed of multiple plates connected together to form the top plate 131, and a third flow channel 1311 may be formed inside the top plate 131.

[0289] In some embodiments, the battery cell 21 may have a top surface in the third direction Z, and the top plate 131 may contact the top surfaces of at least two battery cells 21 of a battery cell assembly 20. Alternatively, the top plate 131 may contact the top surfaces of all battery cells 21 of a battery cell assembly 20.

[0290] The technical solution of this application embodiment achieves heat exchange between the top plate 131 and the battery cell assembly 20 by forming a third flow channel 1311 inside the top plate 131 for accommodating the heat exchange medium, which helps to improve the reliability of the battery device 1.

[0291] Please refer to Figure 2 and Figure 5In some embodiments, the thermal management assembly 11 includes a first sidewall 132, the interior of which is formed a fourth flow channel 1321 for containing a heat exchange medium, and the first sidewall 132 is configured to manage the temperature of at least two battery cells 21 in the battery cell assembly 20.

[0292] In some embodiments, the first sidewall 132 may be part of the thermal management assembly 11. The battery cell assembly 20 may have opposing third sides 24 and fourth sides 25 in the second direction Y. Taking two battery cell assemblies as an example, the third side 24 of one battery cell assembly 20 may be opposite to the fourth side 25 of the other battery cell assembly 20. In the second direction Y, one first sidewall 132 may be thermally connected to the third side 24 of one battery cell assembly 20, and the other first sidewall 132 may be thermally connected to the fourth side 25 of the other battery cell assembly 20.

[0293] In some embodiments, the first sidewall panel 132 may be a solid plate, and the fourth flow channel 1321 may be formed by milling or integral extrusion.

[0294] In some embodiments, the first sidewall panel 132 may be composed of multiple plates connected to form the first sidewall panel 132, and a fourth flow channel 1321 may be formed inside the first sidewall panel 132.

[0295] In some embodiments, the battery cell 21 may have a side surface in the second direction Y, and the first sidewall 132 may contact the side surface of at least two battery cells 21 of a battery cell assembly 20. Alternatively, the first sidewall 132 may contact the side surface of all battery cells 21 of a battery cell assembly 20.

[0296] The technical solution of this application embodiment achieves heat exchange between the first side wall plate 132 and the battery cell assembly 20 by forming a fourth flow channel 1321 inside the first side wall plate 132 for accommodating the heat exchange medium, which helps to improve the reliability of the battery device 1.

[0297] In some embodiments, the first sidewall panel 132 and the top panel 131 are integrally formed.

[0298] In some embodiments, the first sidewall panel 132 and the top plate 131 can be integrally formed, for example, the first sidewall panel 132 and the top plate 131 can be integrally cast, or the first sidewall panel 132 and the top plate 131 can be integrally extruded.

[0299] The technical solution of this application embodiment is that the first side wall panel 132 and the top panel 131 are integrally formed, which facilitates the processing of the second box body 13.

[0300] Please refer to Figure 2 and Figure 5 and refer to Figure 12 , Figure 12 This is a schematic diagram of a battery device from another perspective, provided for some embodiments of this application. In some embodiments, a third flow channel 1311 for containing a heat exchange medium is formed inside the top plate 131. The third flow channel 1311 and the fourth flow channel 1321 are interconnected. A third medium inlet 1322 communicating with the third flow channel 1311 is provided on one first side wall plate 132, and a third medium outlet 1323 communicating with the third flow channel 1311 is provided on another first side wall plate 132.

[0301] In some embodiments, two first sidewall panels 132 are respectively connected to the two ends of the top plate 131 in the second direction Y. One of the fourth flow channels 1321 is connected to the end of the third flow channel 1311 in the second direction Y at the end opposite to the bottom plate 121 in the third direction Z. The other fourth flow channel 1321 is connected to the other end of the third flow channel 1311 in the second direction Y at the end opposite to the bottom plate 121 in the third direction Z.

[0302] In some embodiments, a first sidewall panel 132 may be provided with a third medium inlet 1322 communicating with the third flow channel 1311 of the first sidewall panel 132, and another first sidewall panel 132 may be provided with a third medium outlet 1323 communicating with the third flow channel 1311 of the other first sidewall panel 132.

[0303] In some embodiments, the third medium outlet 1323 and the third medium inlet 1322 may be spaced apart along the second direction Y.

[0304] In some embodiments, with the second direction Y as the projection direction, the orthographic projection of the third medium outlet 1323 and the orthographic projection of the third medium inlet 1322 can overlap.

[0305] In some embodiments, the thermal management assembly 11 may include a fifth connecting pipe and a sixth connecting pipe. The fifth connecting pipe connects the third medium inlet 1322 and the first connector 112, and the sixth connecting pipe connects the third medium outlet 1323 and the second connector 113. This allows the heat exchange medium to enter a fourth flow channel 1321 through the third medium inlet 1322 from the first connector 112, and then through the third flow channel 1311 and another fourth flow channel 1321, before exiting the battery device 1 from the third medium outlet 1323 and the second connector 113.

[0306] It should be noted that the first connector 112 may have multiple interfaces, the first connecting tube 114 is connected to one of the interfaces of the first connector 112, the third connecting tube is connected to another interface of the first connector 112, and the fifth connecting tube is connected to yet another interface of the first connector 112.

[0307] Similarly, the second connector 113 may have multiple interfaces, with the second connecting tube 115 connected to one of the interfaces of the second connector 113, the fourth connecting tube connected to another interface of the second connector 113, and the sixth connecting tube connected to yet another interface of the second connector 113.

[0308] The technical solution of this application embodiment is to set a third medium inlet 1322 on a first side wall plate 132 and a third medium outlet 1323 on another first side wall plate 132 to realize the circulation of heat exchange medium in the third flow channel 1311 and the fourth flow channel 1321, which is beneficial for the first side wall plate 132 and the top plate 131 to manage the temperature of the battery cell assembly 20.

[0309] Please refer to Figure 2 and Figure 5 In some embodiments, a battery cell assembly 20 is disposed between the two first sidewall panels 132, one first sidewall panel 132 is thermally connected to the third side 24 of the battery cell assembly 20, and the other first sidewall panel 132 is thermally connected to the fourth side 25 of the battery cell assembly 20.

[0310] In some embodiments, the number of battery cell assemblies 20 may be one, which has a third side 24 and a fourth side 25 in the second direction Y. One first sidewall 132 is thermally connected to the third side 24, and the other first sidewall 132 is thermally connected to the fourth side 25.

[0311] The technical solution of this application embodiment, through a first side wall plate 132 thermally connected to the third side 24 of the battery cell assembly 20, and another first side wall plate 132 thermally connected to the fourth side 25 of the battery cell assembly 20, can better manage the temperature of the battery cell 21, reduce the risk of the battery cell 21 temperature affecting the charging and discharging efficiency, and help improve the reliability of the battery device 1.

[0312] Please refer to Figure 7 and Figure 8 In some embodiments, a plurality of battery cell assemblies 20 are disposed between the two first sidewall panels 132, and the plurality of battery cell assemblies 20 are arranged along a second direction Y. The thermal management assembly 11 also includes a partition plate 127 disposed between two adjacent battery cell assemblies 20, the partition plate 127 having a second flow channel 1271 formed inside for accommodating a heat exchange medium, and the partition plate 127 being configured to manage the temperature of at least two battery cells 21 in the battery cell assembly 20.

[0313] In some embodiments, the number of battery cell assemblies 20 can be multiple, the multiple battery cell assemblies 20 are arranged along the second direction Y, and the multiple battery cell assemblies 20 are located between two first sidewall panels 132.

[0314] The thermal management assembly 11 includes a separator 127 located between two adjacent battery cell assemblies 20, and the separator 127 has two opposing surfaces in the second direction Y.

[0315] Taking two battery cell modules 20 as an example, the third side 24 of one battery cell module 20 is thermally connected to a first sidewall 132, and the fourth side 25 of the other battery cell module 20 is thermally connected to one surface of the separator 127. The third side 24 of the other battery cell module 20 is thermally connected to another surface of the separator 127, and the fourth side 25 of the other battery cell module 20 is thermally connected to another first sidewall 132.

[0316] The technical solution of this application embodiment, through the joint thermal connection of two first side wall plates 132 and partition plate 127 with the third side 24 and fourth side 25 of the battery cell assembly 20, can better manage the temperature of the battery cell 21, reduce the risk of the battery cell 21 temperature affecting the charging and discharging efficiency, and help improve the reliability of the battery device 1.

[0317] Please refer to Figure 13 and Figure 14 , Figure 13 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 14 This is a schematic diagram of the structure of a thermally conductive component provided in some embodiments of this application. In some embodiments, the outer surface of the battery cell 21 is covered with a thermally conductive component 30. The thermally conductive component 30 includes a first thermally conductive part 31 and a second thermally conductive part 32 that are connected to each other. The first thermally conductive part 31 is thermally connected to the first surface 211, and the second thermally conductive part 32 is thermally connected to the thermal management component 11.

[0318] In some embodiments, the heat-conducting component 30 may include a first heat-conducting part 31 and a second heat-conducting part 32 connected to each other, and the first heat-conducting part 31 and the second heat-conducting part 32 are thermally connected.

[0319] In some embodiments, the first heat-conducting part 31 may be in the form of a plate, and the first heat-conducting part 31 may be thermally connected to the first surface 211. The thermal connection may be such that the first heat-conducting part 31 covers the first surface 211.

[0320] It should be noted that the battery cell 21 may have two first surfaces 211 in the first direction X, and the first heat-conducting part 31 covers one of the first surfaces 211.

[0321] In some embodiments, with the first direction X as the projection direction, the orthographic projection of the first heat-conducting part 31 can overlap with the orthographic projection of the outer casing 215 of the battery cell 21. It should be noted that the orthographic projection of the electrode terminal 214 of the battery cell 21 may extend beyond the orthographic projection of the first heat-conducting part 31.

[0322] In some embodiments, the second heat-conducting part 32 may be in the form of a plate, and the second heat-conducting part 32 may be thermally connected to the thermal management component 11.

[0323] The thermal management component 11 is thermally connected to the second thermally conductive part 32 and exchanges heat with the first surface 211 through the first thermally conductive part 31.

[0324] In some embodiments, the number of heat-conducting elements 30 can be multiple. One heat-conducting element 30 can be provided for one battery cell 21, or one heat-conducting element 30 can be provided for two battery cells 21, or one heat-conducting element 30 can be provided for two or more battery cells 21.

[0325] In some embodiments, taking one second heat-conducting part 32 as an example, and two battery cells 21 corresponding to one heat-conducting element 30, the thermal management component 11 can be thermally connected to the first side 22, and the second heat-conducting part 32 can be located between the thermal management component 11 and the first side 22. The second heat-conducting part 32 is connected to the lower end of the first heat-conducting part 31 in the third direction Z, and with the third direction Z as the projection direction, the orthographic projection of the second heat-conducting part 32 overlaps with the orthographic projection of the two battery cells 21.

[0326] The thermal management component 11 can be thermally connected to the second side 23, and the second thermally conductive part 32 can be located between the thermal management component 11 and the second side 23. The second thermally conductive part 32 is connected to the upper end of the first thermally conductive part 31 in the third direction Z. With the third direction Z as the projection direction, the orthographic projection of the second thermally conductive part 32 overlaps with the orthographic projection of the two battery cells 21.

[0327] The thermal management component 11 can be thermally connected to the third side 24, and the second thermally conductive part 32 can be located between the thermal management component 11 and the third side 24. The second thermally conductive part 32 is connected to one end of the first thermally conductive part 31 in the second direction Y. With the second direction Y as the projection direction, the orthographic projection of the second thermally conductive part 32 overlaps with the orthographic projection of the two battery cells 21.

[0328] The thermal management component 11 can be thermally connected to the fourth side 25, and the second thermally conductive part 32 can be located between the thermal management component 11 and the fourth side 25. The second thermally conductive part 32 is connected to one end of the first thermally conductive part 31 in the second direction Y. With the second direction Y as the projection direction, the orthographic projection of the second thermally conductive part 32 overlaps with the orthographic projection of the two battery cells 21.

[0329] In some embodiments, taking two second heat-conducting parts 32 as an example, with one heat-conducting element 30 corresponding to two battery cells 21. The thermal management component 11 can be thermally connected to the first side 22 and the second side 23. One second heat-conducting part 32 can be located between the thermal management component 11 and the first side 22, and the other second heat-conducting part 32 can be located between the thermal management component 11 and the second side 23. The two second heat-conducting parts 32 are respectively connected to the two ends of the first heat-conducting part 31 in the third direction Z. With the third direction Z as the projection direction, the orthographic projection of one second heat-conducting part 32 overlaps with the orthographic projection of the two battery cells 21, and the orthographic projection of the other second heat-conducting part 32 overlaps with the orthographic projection of the two battery cells 21.

[0330] The thermal management component 11 can be thermally connected to the first side 22 and the third side 24. A second thermally conductive part 32 can be located between the thermal management component 11 and the first side 22, and another second thermally conductive part 32 can be located between the thermal management component 11 and the third side 24. One second thermally conductive part 32 is connected to the lower end of the first thermally conductive part 31 in the third direction Z, and another second thermally conductive part 32 is connected to the lower end of the first thermally conductive part 31 in the second direction Y. With the third direction Z as the projection direction, the orthographic projection of one second thermally conductive part 32 overlaps with the orthographic projection of the two battery cells 21. With the second direction Y as the projection direction, the orthographic projection of the other second thermally conductive part 32 overlaps with the orthographic projection of the two battery cells 21.

[0331] The thermal management component 11 can be thermally connected to the third side 24 and the fourth side 25. One second thermally conductive part 32 can be located between the thermal management component 11 and the third side 24, and another second thermally conductive part 32 can be located between the thermal management component 11 and the fourth side 25. The two second thermally conductive parts 32 are respectively connected to the two ends of the first thermally conductive part 31 in the second direction Y. With the second direction Y as the projection direction, the orthographic projection of one second thermally conductive part 32 overlaps with the orthographic projection of the two battery cells 21, and the orthographic projection of the other second thermally conductive part 32 overlaps with the orthographic projection of the two battery cells 21.

[0332] In some embodiments, taking three second heat-conducting parts 32 as an example, with one heat-conducting element 30 corresponding to two battery cells 21. The thermal management component 11 can be thermally connected to the first side 22, the second side 23, and the third side 24. One second heat-conducting part 32 can be located between the thermal management component 11 and the first side 22, another second heat-conducting part 32 can be located between the thermal management component 11 and the second side 23, and yet another second heat-conducting part 32 can be located between the thermal management component 11 and the third side 24. One second heat-conducting part 32 is connected to one end of the first heat-conducting part 31 in the third direction Z, another second heat-conducting part 32 is connected to the other end of the first heat-conducting part 31 in the third direction Z, and yet another second heat-conducting part 32 is connected to one end of the first heat-conducting part 31 in the second direction Y. With the third direction Z as the projection direction, the orthographic projection of one second heat-conducting part 32 overlaps with the orthographic projection of the two battery cells 21, and the orthographic projection of the other second heat-conducting part 32 also overlaps with the orthographic projection of the two battery cells 21. With the second direction Y as the projection direction, the orthographic projection of another second heat-conducting part 32 overlaps with the orthographic projection of two battery cells 21.

[0333] The thermal management component 11 can be thermally connected to the first side 22, the third side 24, and the fourth side 25. A second thermally conductive part 32 can be located between the thermal management component 11 and the first side 22, another second thermally conductive part 32 can be located between the thermal management component 11 and the third side 24, and yet another second thermally conductive part 32 can be located between the thermal management component 11 and the fourth side 25. One second thermally conductive part 32 is connected to one end of the first thermally conductive part 31 in the third direction Z, another second thermally conductive part 32 is connected to one end of the first thermally conductive part 31 in the second direction Y, and yet another second thermally conductive part 32 is connected to the other end of the first thermally conductive part 31 in the second direction Y. With the third direction Z as the projection direction, the orthographic projection of one second thermally conductive part 32 overlaps with the orthographic projection of two battery cells 21. With the second direction Y as the projection direction, the orthographic projection of another second thermally conductive part 32 overlaps with the orthographic projection of two battery cells 21, and yet another second thermally conductive part 32 overlaps with the orthographic projection of two battery cells 21.

[0334] The technical solution of this application embodiment, by setting a heat-conducting component 30, makes the first heat-conducting part 31 heat-conductingly connected to the first surface 211, and the second heat-conducting part 32 heat-conductingly connected to the thermal management component 11, so that the thermal management component 11 can regulate the temperature of the first surface 211 through the heat-conducting component 30, which can better manage the temperature of the battery cell 21, reduce the risk of the battery cell 21 temperature affecting the charging and discharging efficiency, and help improve the reliability of the battery device 1.

[0335] Please refer to Figure 13 and Figure 14In some embodiments, the battery cell 21 includes an electrode terminal 214 located on the second side 23. The first side 22, the third side 24, and the fourth side 25 are all provided with a second heat-conducting portion 32.

[0336] In some embodiments, the number of second heat-conducting parts 32 can be three, taking one heat-conducting element 30 corresponding to two battery cells 21 as an example. The thermal management component 11 can be thermally connected to the first side 22, the third side 24, and the fourth side 25. One second heat-conducting part 32 can be located between the thermal management component 11 and the first side 22, another second heat-conducting part 32 can be located between the thermal management component 11 and the third side 24, and yet another second heat-conducting part 32 can be located between the thermal management component 11 and the fourth side 25. One second heat-conducting part 32 is connected to one end of the first heat-conducting part 31 in the third direction Z, another second heat-conducting part 32 is connected to one end of the first heat-conducting part 31 in the second direction Y, and yet another second heat-conducting part 32 is connected to the other end of the first heat-conducting part 31 in the second direction Y. With the third direction Z as the projection direction, the orthographic projection of one second heat-conducting part 32 overlaps with the orthographic projection of the two battery cells 21. With the second direction Y as the projection direction, the orthographic projection of another second heat-conducting part 32 overlaps with the orthographic projection of two battery cells 21, and the orthographic projection of yet another second heat-conducting part 32 overlaps with the orthographic projection of two battery cells 21.

[0337] The technical solution of this application embodiment, through the thermal connection between the second heat-conducting part 32 and the first side 22, the third side 24 and the fourth side 25, can better manage the temperature of the battery cell 21, reduce the risk of the temperature of the battery cell 21 affecting the charging and discharging efficiency, and at the same time reduce the risk of interference between the heat-conducting part 30 and the electrode terminal 214, which is conducive to improving the reliability of the battery device 1.

[0338] In some embodiments, the material of the heat-conducting element 30 includes at least one of graphene, carbon nanotubes, and silicene.

[0339] In some embodiments, the heat-conducting element 30 may be made of graphene.

[0340] The technical solution of this application embodiment has good thermal conductivity of graphene, carbon nanotubes and silicene. By setting the material of the heat-conducting component 30 to include at least one of the above materials, the temperature of the battery cell 21 can be better managed, reducing the risk of the battery cell 21 temperature affecting the charging and discharging efficiency, and improving the reliability of the battery device 1.

[0341] Please refer to Figure 2In some embodiments, the thermal management component 11 is thermally connected to the second side 23. In the third direction Z, the battery cell 21 has a second surface 212 located on the second side 23. The battery cell 21 includes an electrode terminal 214 disposed on the second surface 212. The thermal management component 11 is thermally connected to the second surface 212.

[0342] In some embodiments, in the third direction Z, the battery cell 21 may have two opposing surfaces, wherein the upper surface may be a second surface 212, which faces the top plate 131. The electrode terminal 214 is disposed on the second surface 212, that is, the electrode terminal 214 of the battery cell 21 is disposed upward, and the second surface 212 is the surface of the end cap 2151.

[0343] In some embodiments, the thermal management component 11 is thermally connected to the second side 23, that is, a third flow channel 1311 for accommodating the heat exchange medium is formed inside the top plate 131. The top plate 131 is thermally connected to the second surface 212.

[0344] The technical solution of this application embodiment, through the thermal management component 11 and the second surface 212 thermally connected, can better manage the temperature of the battery cell 21, reduce the risk of the battery cell 21 temperature affecting the charging and discharging efficiency, and help improve the reliability of the battery device 1.

[0345] Please refer to Figure 2 In some embodiments, the thermal management assembly 11 is thermally connected to the second side 23. In the third direction Z, the battery cell 21 has a second surface 212 located on the second side 23. The battery cell 21 includes electrode terminals 214 disposed on the second surface 212. The battery cell assembly 20 also includes a busbar that electrically connects to the electrode terminals 214 of a plurality of battery cells 21. The thermal management assembly 11 is thermally connected to the busbar.

[0346] In some embodiments, in the third direction Z, the battery cell 21 may have two opposing surfaces, wherein the upper surface may be a second surface 212, which faces the top plate 131. The electrode terminal 214 is disposed on the second surface 212, that is, the electrode terminal 214 of the battery cell 21 is disposed upward, and the second surface 212 is the surface of the end cap 2151.

[0347] In some embodiments, the thermal management component 11 is thermally connected to the second side 23, that is, a third flow channel 1311 for accommodating the heat exchange medium is formed inside the top plate 131. The busbar component is electrically connected to the electrode terminals 214 of a plurality of battery cells 21, and the thermal management component 11 is thermally connected to the busbar component.

[0348] The technical solution of this application embodiment, through the thermal management component 11 and the busbar component thermally connected, can better manage the temperature of the battery cell 21, reduce the risk of the battery cell 21 temperature affecting the charging and discharging efficiency, and help improve the reliability of the battery device 1.

[0349] Please refer to Figure 15 , Figure 15 This is an exploded view of the structure of a battery device provided in some embodiments of this application. In some embodiments, the thermal management component 11 is thermally connected to the third side 24. In the second direction Y, the battery cell 21 has a third surface 213 located on the third side 24. The battery cell 21 includes an electrode terminal 214 disposed on the third surface 213. The thermal management component 11 is thermally connected to the third surface 213.

[0350] In some embodiments, in the second direction Y, the battery cell 21 may have two opposing third surfaces 213, one third surface 213 facing a first sidewall 132 and the other third surface 213 facing another sidewall. Electrode terminals 214 are disposed on the third surface 213, that is, the electrode terminals 214 of the battery cell 21 are disposed on the side, and the third surface 213 is the surface of the end cap 2151.

[0351] In some embodiments, the thermal management component 11 is thermally connected to the third side 24, that is, a fourth flow channel 1321 for accommodating the heat exchange medium is formed inside the first side wall panel 132. The first side wall panel 132 is thermally connected to the third surface 213.

[0352] In some embodiments, the number of electrode terminals 214 can be two, and the two electrode terminals 214 can be disposed on the same third surface 213. A first sidewall plate 132 facing the third surface 213 on which the electrode terminals 214 are disposed can be formed with a fourth flow channel 1321, and the first sidewall plate 132 is thermally connected to the third surface 213.

[0353] In some embodiments, the number of electrode terminals 214 can be two, with one electrode terminal 214 disposed on one third surface 213 and the other electrode terminal 214 disposed on another third surface 213. Both first sidewall plates 132 can be provided with fourth flow channels 1321, with one first sidewall plate 132 thermally connected to one third surface 213 and the other first sidewall plate 132 thermally connected to the other third surface 213.

[0354] The technical solution of this application embodiment, through the thermal management component 11 and the third surface 213 thermally connected, can better manage the temperature of the battery cell 21, reduce the risk of the battery cell 21 temperature affecting the charging and discharging efficiency, and help improve the reliability of the battery device 1.

[0355] 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.

[0356] Please refer to Figure 2 and Figure 5 In some embodiments, the battery device 1 can be used to power a commercial vehicle. The battery device 1 includes a housing 10 and a battery cell assembly 20. The housing 10 has a length dimension L1 and a width dimension L2, satisfying the following conditions: 1000mm≤L1≤2300mm, 630mm≤L2≤780mm, and 0.27≤L2 / L1≤0.78. The battery cell assembly 20 is disposed within the housing 10 and includes a plurality of battery cells 21 stacked along the length of the housing 10.

[0357] The battery cell 21 has a first surface 211 perpendicular to the length direction of the housing 10, and the first surface 211 is the surface with the largest area of ​​the battery cell 21.

[0358] The battery cell assembly 20 has a first side 22 and a second side 23 opposite each other in the height direction of the housing 10, and a third side 24 and a fourth side 25 opposite each other in the width direction of the housing 10.

[0359] In some embodiments, the housing 10 includes a first housing body 12 and a second housing body 13. The first housing body 12 includes a bottom plate 121, which has a bearing surface 1211 on one side in the height direction of the housing 10. The bearing surface 1211 is used to support the battery cell assembly 20 in the height direction of the housing 10. The second housing body 13 and the first housing body 12 together define an assembly space 14 for accommodating the battery cell assembly 20. The second housing body 13 includes a top plate 131 and two first side wall panels 132. The top plate 131 and the bottom plate 121 are arranged opposite each other in the height direction of the housing 10, and the two first side wall panels 132 are arranged opposite each other in the width direction of the housing 10. One end of the first side wall panel 132 in the height direction of the housing 10 is connected to the top plate 131.

[0360] The bottom plate 121 has a first flow channel 1212 formed inside to accommodate the heat exchange medium, so that the bottom plate 121 is thermally connected to the first side 22. The top plate 131 has a third flow channel 1311 formed inside to accommodate the heat exchange medium, so that the top plate 131 is thermally connected to the second side 23. Each of the two first side wall plates 132 has a fourth flow channel 1321 formed inside to accommodate the heat exchange medium, so that one first side wall plate 132 is thermally connected to the third side 24 and the other first side wall plate 132 is thermally connected to the fourth side 25.

[0361] In the technical solution of this application embodiment, the battery cells 21 are stacked along the first direction X, and the dimensions of the housing 10 in the first direction X and the dimensions in the second direction Y satisfy the above conditions, resulting in a large number of battery cells 21. Through thermally conductive connections between the thermal management component 11 and at least two of the first side 22, second side 23, third side 24, and fourth side 25, the thermal management component 11 can effectively manage the temperature of the battery cells 21, reducing the risk of the battery cell temperature affecting the charging and discharging efficiency, and thus improving the reliability of the battery device 1. Meanwhile, the first surface 211 is perpendicular to the stacking direction of the multiple battery cells 21. Compared with the thermal management component 11 being thermally connected to the first surface 211 of the battery cells 21, the thermal connection to the first surface 211 requires the separate provision of heat exchange components (such as water-cooled plates, water-cooled pipes, etc.) that are thermally connected to the first surface 211 of each battery cell 21. This results in a larger number of heat exchange components, higher costs, and occupies more space in the first direction X of the housing 10, affecting the energy density of the battery device 1. Therefore, the solution of this application is beneficial for saving costs and improving the space utilization of the battery device 1, thereby improving the energy density of the battery device 1.

[0362] 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: The box body has a dimension of L1 along the first direction and a dimension of L2 along the second direction, satisfying the following conditions: 1000mm≤L1≤2300mm, 630mm≤L2≤780mm, and 0.27≤L2 / L1≤0.

78. A battery cell assembly is disposed within the housing. The battery cell assembly includes a plurality of battery cells stacked along a first direction. Each battery cell has a first surface perpendicular to the first direction, and the first surface is the surface with the largest area of ​​the battery cell. The battery cell assembly has a first side and a second side opposite to each other in the third direction, and a third side and a fourth side opposite to each other in the second direction. The first direction, the second direction and the third direction are perpendicular to each other, and the third direction is parallel to the direction of gravity. The housing includes a thermal management component, which is thermally connected to at least two of the first side, the second side, the third side, and the fourth side. The thermal management component has a flow channel inside, which is used to contain the heat exchange medium.

2. The battery device according to claim 1, characterized in that, The thermal management component is thermally connected to at least three of the first side, the second side, the third side, and the fourth side.

3. The battery device according to claim 1, characterized in that, The thermal management component is thermally connected to the first side, the second side, the third side, and the fourth side.

4. The battery device according to any one of claims 1-3, characterized in that, The enclosure includes: The first housing body includes a base plate, the base plate having a bearing surface on one side in the third direction, the bearing surface being used to support the battery cell assembly along the third direction; and 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 two first side wall panels. The top plate and the bottom plate are arranged opposite each other along the third direction, and the two first side wall panels are arranged opposite each other along the second direction. One end of the first side wall panel in the third direction is connected to the top plate.

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

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

7. The battery device according to claim 4, characterized in that, The thermal management assembly includes the base plate, which is thermally connected to the first side. The base plate has a first flow channel formed inside it for accommodating the heat exchange medium. The base 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 claim 7, 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.

9. The battery device according to claim 8, 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.

10. The battery device according to claim 9, 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 first medium inlet and a first medium outlet that communicate with the first flow channel. The first medium inlet and the first medium outlet are both located between the first expansion beam and the third side wall plate.

11. The battery device according to claim 10, characterized in that, The thermal management assembly further includes a first connector and a second connector, the first connector and the second connector being respectively disposed on the third side wall plate; The thermal management assembly 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 first medium inlet and the first connector, and the second connecting pipe connects the first medium outlet and the second connector.

12. The battery device according to claim 9, characterized in that, The first box body also includes a second expansion beam, which is connected to the bottom plate and is disposed opposite to the first expansion beam along the first direction. The two ends of the battery cell assembly abut against the first expansion beam and the second expansion beam, respectively.

13. The battery device according to claim 12, 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.

14. The battery device according to claim 13, characterized in that, The thermal management assembly also includes the partition plate, the interior of which is formed a second flow channel for containing the heat exchange medium, and the partition plate is configured to manage the temperature of at least two of the battery cells in the battery cell assembly.

15. The battery device according to any one of claims 13-14, 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 first flow channel is formed inside the second sub-base plate. The third sub-base plate is connected to the second expansion beam and the 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 second direction. The second part is integrally formed with the partition plate, and the first part and the third part are connected through the second part.

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 is provided with a second medium inlet and a second medium outlet that communicate with the second flow channel. Both the second medium outlet and the second medium inlet are located on the side of the first expansion beam away from the battery cell assembly.

18. The battery device according to any one of claims 13-14 and 16-17, characterized in that, The partition plate has a connecting block at one end away from the first expansion beam, and the second expansion beam has a groove on the side facing the first expansion beam. At least a portion of the connecting block is embedded in the groove to prevent the partition plate from detaching from the second expansion beam.

19. The battery device according to any one of claims 5-14, 16-17, characterized in that, The thermal management assembly includes a top plate that is thermally connected to the second side. A third flow channel is formed inside the top plate to accommodate the heat exchange medium. The top plate is configured to manage the temperature of at least two of the battery cells in the battery cell assembly.

20. The battery device according to any one of claims 5-14 and 16-17, characterized in that, The thermal management assembly includes a first sidewall panel, the interior of which is formed a fourth flow channel for accommodating the heat exchange medium, and the first sidewall panel is configured to manage the temperature of at least two of the battery cells in the battery cell assembly.

21. The battery device according to claim 20, characterized in that, The first side wall panel and the top panel are integrally formed.

22. The battery device according to claim 21, characterized in that, The top plate has a third flow channel for containing the heat exchange medium inside. The third flow channel and the fourth flow channel are interconnected. A third medium inlet communicating with the third flow channel is provided on one of the first sidewalls, and a third medium outlet communicating with the third flow channel is provided on the other first sidewall.

23. The battery device according to claim 20, characterized in that, A battery cell assembly is disposed between the two first sidewall panels, one of the first sidewall panels is thermally connected to the third side of the battery cell assembly, and the other of the first sidewall panels is thermally connected to the fourth side of the battery cell assembly.

24. The battery device according to claim 20, characterized in that, A plurality of battery cell assemblies are disposed between the two first sidewall panels, and the plurality of battery cell assemblies are arranged along the second direction; The thermal management assembly further includes a partition plate disposed between two adjacent battery cell assemblies. The partition plate has a second flow channel formed inside it for accommodating the heat exchange medium. The partition plate is configured to manage the temperature of at least two of the battery cells in the battery cell assembly.

25. 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 thermal management component.

26. The battery device according to claim 25, characterized in that, The battery cell includes an electrode terminal, which is located on the second side; The first side, the third side, and the fourth side are all provided with the second heat-conducting part.

27. The battery device according to any one of claims 25-26, characterized in that, The material of the heat-conducting component includes at least one of graphene, carbon nanotubes, and silicene.

28. The battery device according to claim 1, characterized in that, The thermal management component is thermally connected to the second side. In the third direction, the battery cell has a second surface located on the second side. The battery cell includes electrode terminals, which are disposed on the second surface. The thermal management component is thermally connected to the second surface.

29. The battery device according to claim 1, characterized in that, The thermal management component is thermally connected to the second side. In the third direction, the battery cell has a second surface located on the second side. The battery cell includes electrode terminals disposed on the second surface. The battery cell assembly also includes a busbar component, which is electrically connected to the electrode terminals of the plurality of battery cells, and the thermal management component is thermally connected to the busbar component.

30. The battery device according to claim 1, characterized in that, The thermal management component is thermally connected to the third side. In the second direction, the battery cell has a third surface located on the third side. The battery cell includes electrode terminals disposed on the third surface. The thermal management component is thermally connected to the third surface.

31. An electrical device, characterized in that, The battery device includes any one of claims 1-30, wherein the battery device is used to provide electrical energy to the electrical device.

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