Battery device and electric device

Abstract

The embodiment of the utility model provides a battery device and a power utilization device. The battery device comprises a first battery monomer assembly, a second battery monomer assembly and a box body assembly, the first battery monomer assembly and the second battery monomer assembly are arranged at an interval along a first direction; the box body assembly comprises a first supporting part, a second supporting part, a first expansion beam and a second expansion beam; the first supporting part supports the first battery cell assembly in the first direction, and the second supporting part is located between the first battery cell assembly and the second battery cell assembly in the first direction and supports the second battery cell assembly; the first expansion beam is arranged at the end part of the first battery monomer assembly in the second direction, the first expansion beam is connected with the first supporting component, the second expansion beam is arranged at the end part of the second battery monomer assembly in the second direction, and the second expansion beam is connected with the second supporting component; wherein the first expansion beam is connected with the second expansion beam. According to the technical scheme, the reliability of the battery device can be improved.

Description

Technical Field

[0001] This application relates to the field of battery device 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 manufacturing process of battery devices, the reliability of the battery device is a crucial issue. Therefore, improving the reliability of battery devices is a pressing technical problem that needs to be solved. Utility Model Content

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

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

[0006] In a first aspect, this application provides a battery device, which includes a first battery cell assembly, a second battery cell assembly, and a housing assembly; the first battery cell assembly and the second battery cell assembly are spaced apart along a first direction; the housing assembly includes a first support member, a second support member, a first expansion beam, and a second expansion beam; the first support member supports the first battery cell assembly, and along the first direction, the second support member is located between the first battery cell assembly and the second battery cell assembly, and the second support member supports the second battery cell assembly; the first expansion beam is disposed at the end of the first battery cell assembly in a second direction, and the first expansion beam is connected to the first support member; the second expansion beam is disposed at the end of the second battery cell assembly in the second direction, and the second expansion beam is connected to the second support member, and the second direction is perpendicular to the first direction; wherein, the first expansion beam and the second expansion beam are connected.

[0007] According to the battery device of the present application embodiment, the first expansion beam and the second expansion beam are connected as one unit, which can improve the overall strength of the structure after the first expansion beam and the second expansion beam are connected, improve the connection reliability between the first expansion beam and the first support component, and the connection reliability between the second expansion beam and the second support component, and facilitate the improvement of the resistance to the expansion deformation of the first battery cell assembly and the expansion deformation of the second battery cell assembly, thereby improving the reliability of the battery device.

[0008] According to some embodiments of this application, the first expansion beam includes a first portion and a second portion distributed along a first direction. The first portion connects the second portion and the first support member. The second portion is located on the side of the second expansion beam opposite to the second battery cell assembly and is connected to the second expansion beam.

[0009] In the above scheme, the second part is located on the side of the second expansion beam away from the second battery cell assembly. The second part is connected to the second expansion beam, and the first part connects the second part and the first support component, so that the first expansion beam and the second expansion beam have a large overlap area in the second direction. This facilitates the improvement of the overall strength of the structure after the first expansion beam and the second expansion beam are connected, and further improves the resistance to the expansion force of the first battery cell assembly and the expansion force of the second battery cell assembly.

[0010] According to some embodiments of this application, the second part is connected to the second expansion beam by a first fastener.

[0011] In the above scheme, the second part is connected to the second expansion beam by the first fastener, which makes the connection between the second part and the second expansion beam highly stable.

[0012] According to some embodiments of this application, the second part is provided with a through hole, the second expansion beam is provided with a threaded hole, and the first fastener passes through the through hole and is threadedly connected to the threaded hole.

[0013] In the above scheme, the first fastener passes through the through hole and is threadedly connected to the threaded hole, which is convenient to operate, easy to assemble and disassemble, and convenient to repair and replace.

[0014] According to some embodiments of this application, along the second direction, the thickness of the second portion is less than the thickness of the first portion.

[0015] In the above scheme, the thickness of the second part is less than that of the first part, so as to reduce the space occupied by the structure after the second part is connected to the second expansion beam in the second direction, and facilitate the battery device to have a higher energy density.

[0016] According to some embodiments of this application, the first portion has a first surface facing the first battery cell assembly, the second portion has a second surface facing the second battery cell assembly, a stepped surface is formed between the first surface and the second surface, and the second expansion beam overlaps the stepped surface.

[0017] In the above scheme, by forming a stepped surface between the first surface and the second surface, the second expansion beam overlaps the stepped surface, which can realize the assembly positioning of the second expansion beam, so as to improve assembly efficiency and assembly stability.

[0018] According to some embodiments of this application, the first portion has a first surface facing the first battery cell assembly, and the second expansion beam has a third surface facing the second battery cell assembly, the third surface being coplanar with the first surface.

[0019] In the above scheme, the third surface is coplanar with the first surface, and the second expansion beam and the first expansion beam can correspond to the second battery cell assembly and the first battery cell assembly with the same structure, which is convenient for processing and manufacturing and easy for assembly.

[0020] According to some embodiments of this application, the first expansion beam is a hollow structure, and the second expansion beam is a hollow structure.

[0021] In the above scheme, the first expansion beam is a hollow structure and the second expansion beam is a hollow structure. While meeting the strength requirements, the weight of the box assembly can be reduced, which facilitates the reduction of the weight of the battery device.

[0022] According to some embodiments of this application, the first expansion beam is an integral extrusion structure, and the second expansion beam is an integral extrusion structure.

[0023] In the above scheme, the first expansion beam is an integral extrusion structure, and the second expansion beam is an integral extrusion structure, which is convenient for processing and manufacturing, and the material is evenly distributed. The first expansion beam and the second expansion beam each have high overall strength.

[0024] According to some embodiments of this application, a protrusion is formed on the side of the first expansion beam opposite to the first battery cell assembly, and the protrusion is connected to the first support member.

[0025] In the above scheme, the protrusion is formed on the side of the first expansion beam opposite to the first battery cell assembly and is connected to the first support member, which can improve the deformation resistance of the first expansion beam and facilitate the absorption of the expansion force of the first battery cell assembly and the force transmitted to the first expansion beam by the second expansion beam.

[0026] According to some embodiments of this application, a first flow channel is formed inside the first support member for containing a heat exchange medium; and / or, a second flow channel is formed inside the second support member for containing a heat exchange medium.

[0027] In the above scheme, by using the heat exchange medium contained in the first flow channel, the temperature of the first battery cell assembly can be adjusted using the heat exchange medium, thereby improving the cycle performance of the first battery cell assembly; by using the heat exchange medium contained in the second flow channel, the temperature of the second battery cell assembly can be adjusted using the heat exchange medium, thereby improving the cycle performance of the second battery cell assembly.

[0028] According to some embodiments of this application, there are two first expansion beams, which are spaced apart along a second direction, and a first battery cell assembly is disposed between the two first expansion beams; there are also two second expansion beams, which are spaced apart along a second direction, and a second battery cell assembly is disposed between the two second expansion beams.

[0029] In the above scheme, the first battery cell assembly may include a plurality of first battery cells stacked along the second direction, and the second battery cell assembly may include a plurality of second battery cells stacked along the second direction; the first battery cell assembly has a large expansion force in the second direction, the second battery cell assembly has a large expansion force in the second direction, two first expansion beams are spaced apart along the second direction, two second expansion beams are spaced apart along the second direction, and the structure formed by connecting the first expansion beams and the second expansion beams can be distributed at both ends in the second direction to resist the expansion force of the first battery cell assembly and the second battery cell assembly in the second direction, thereby improving the reliability of the battery device.

[0030] Secondly, this application also provides an electrical device that includes a battery device according to any of the above embodiments.

[0031] 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

[0032] 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.

[0033] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0034] Figure 2 This is an exploded view of the structure of a battery device provided in some embodiments of this application;

[0035] Figure 3 Cross-sectional views of a battery device provided for some embodiments of this application;

[0036] Figure 4 Cross-sectional views of a portion of the structure of a battery device provided in some embodiments of this application;

[0037] Figure 5 Schematic diagrams of the structure of the first expansion beam and the second expansion beam provided in some embodiments of this application;

[0038] Figure 6 A schematic diagram of the assembly state of the first expansion beam and the second expansion beam provided for some embodiments of this application;

[0039] Figure 7 A cross-sectional view of the first expansion beam and the second expansion beam in an assembled state, provided for some embodiments of this application;

[0040] Figure 8 for Figure 4 Enlarged view of a portion at point A;

[0041] Figure 9 A cross-sectional view of a first support member and a second support member provided for some embodiments of this application.

[0042] Icons: 100 - Battery assembly; 10 - Housing assembly; 10a - Housing; 11 - First housing; 111 - Bottom wall; 112 - First side wall; 113 - Second side wall; 12 - Second housing; 121 - Top wall; 122 - Third side wall; 123 - Fourth side wall; 13 - First support member; 131 - First flow channel; 14 - Second support member; 141 - Second flow channel; 15 - First expansion beam; 150 - Body; 15a - First part; 15b - Second part; 151 - Through hole; 152 - First surface; 153 - ... Second surface; 154-Fourth surface; 155-Fifth surface; 156-Stepped surface; 157-Protrusion; 16-Second expansion beam; 161-Threaded hole; 162-Third surface; 17-First fastener; 18-Mounting beam; 20-First battery cell assembly; 21-First battery cell; 30-Second battery cell assembly; 31-Second battery cell; 200-Controller; 300-Motor; 1000-Vehicle; Q1-First receiving space; Q2-Second receiving space; X-Third direction; Y-Second direction; Z-First direction. Detailed Implementation

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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).

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0054] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure 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. The first enclosure may be a top cover or a bottom plate.

[0055] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0056] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0062] 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.

[0063] 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 made of stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium with a silver-plated surface. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector 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.).

[0064] 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.

[0065] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0070] 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.

[0071] 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.

[0072] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0073] In some implementations, the electrode assembly is a stacked structure.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch 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.

[0080] The development of battery device technology must take into account multiple design factors, such as performance parameters like energy density, discharge capacity, and charge / discharge rate. In addition, the reliability of the battery device also needs to be considered.

[0081] In some embodiments, the battery device includes a housing assembly and a plurality of battery cell assemblies disposed within the housing assembly. The battery cell assemblies are arranged in layers within the housing assembly, and each battery cell assembly is supported by a corresponding support member. Typically, an expansion beam is provided at the end of each battery cell assembly to resist its expansion and deformation. However, the expansion beams of each layer of battery cell assemblies are independent of each other, and are connected to the support member of that layer. During operation, the expansion beams resist the expansion of the battery cells within the battery cell assembly. However, as the battery device operates, the connection reliability between the expansion beams and the support members becomes poor, easily leading to connection failure. This results in a weak anti-expansion effect of the expansion beams on the battery cell assemblies, making the battery cells prone to expansion and deformation, thus posing a safety risk and reducing the reliability of the battery device.

[0082] In view of this, in order to solve the problem that the poor connection reliability between the expansion beam and the supporting component leads to a poor resistance of the expansion beam to the expansion of the battery cell assembly, and thus a low reliability of the battery device, this application provides a battery device, which includes a first battery cell assembly, a second battery cell assembly, and a housing assembly; the first battery cell assembly and the second battery cell assembly are spaced apart along a first direction; the housing assembly includes a first supporting component, a second supporting component, a first expansion beam, and a second expansion beam; the first supporting component supports the first battery cell assembly, and along the first direction, the second supporting component is located between the first battery cell assembly and the second battery cell assembly, and supports the second battery cell assembly; the first expansion beam is disposed at the end of the first battery cell assembly in a second direction, and the first expansion beam is connected to the first supporting component; the second expansion beam is disposed at the end of the second battery cell assembly in the second direction, and the second expansion beam is connected to the second supporting component, and the second direction is perpendicular to the first direction; wherein, the first expansion beam and the second expansion beam are connected. This battery device has high reliability.

[0083] In this battery device, a first support member supports a first battery cell assembly, and a second support member supports a second battery cell assembly, so that the first and second battery cell assemblies are arranged along a first direction. A first expansion beam is disposed at the end of the first battery cell assembly in a second direction and is connected to the first support member to resist the expansion force of the first battery cell assembly. A second expansion beam is disposed at the end of the second battery cell assembly in the second direction and is connected to the second support member to resist the expansion force of the second battery cell assembly. The connection between the first and second expansion beams, and their integration as a single unit, improves the overall strength of the structure after the connection of the first and second expansion beams. It also improves the connection reliability between the first and second expansion beams and the first and second support members, thereby enhancing the resistance to the expansion deformation of the first and second battery cell assemblies and improving the reliability of the battery device.

[0084] The battery device disclosed in this application can be used, but is not limited to, in electrical equipment such as vehicles, ships, or aircraft. A power system for such electrical equipment can be constructed using the battery device disclosed in this application.

[0085] The technical solutions described in the embodiments of this application are applicable to various power devices that use battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0086] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device according to an embodiment of this application.

[0087] 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 1000 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 is installed inside the vehicle 1000, and the battery device can be located at the bottom, front, or rear of the vehicle 1000. The battery device can be used to power the vehicle 1000; for example, the battery device can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 1000.

[0088] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0089] In some embodiments of this application, the battery device can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0090] Please refer to Figure 2 and Figure 3 , Figure 2 This is an exploded view of the structure of a battery device provided in some embodiments of this application. Figure 3 This is a cross-sectional view of a battery device provided in some embodiments of this application. Embodiments of this application provide a battery device 100, which includes a first battery cell assembly 20, a second battery cell assembly 30, and a housing assembly 10. The first battery cell assembly 20 and the second battery cell assembly 30 are spaced apart along a first direction Z. The housing assembly 10 includes a first support member 13, a second support member 14, a first expansion beam 15, and a second expansion beam 16. The first support member 13 supports the first battery cell assembly 20 along the first direction Z. The second support member 14 is located between the first battery cell assembly 20 and the second battery cell assembly 30, and supports the second battery cell assembly 30. The first expansion beam 15 is disposed at the end of the first battery cell assembly 20 in a second direction Y, and is connected to the first support member 13. The second expansion beam 16 is disposed at the end of the second battery cell assembly 30 in the second direction Y, and is connected to the second support member 14. The second direction Y is perpendicular to the first direction Z. The first expansion beam 15 and the second expansion beam 16 are connected.

[0091] In some embodiments, the housing assembly 10 further includes a housing 10a, which provides a receiving space for the first battery cell assembly 20 and the second battery cell assembly 30.

[0092] Figure 2 and Figure 3 In this context, the direction indicated by the letter Z can be a first direction, and the direction indicated by the letter Y can be a second direction. In some embodiments, the first direction Z can be parallel to the height direction of the battery device 100. The second direction Y can be parallel to the length direction of the battery device 100.

[0093] In some embodiments, the housing 10a may include a first housing 11 and a second housing 12, the first housing 11 and the second housing 12 covering each other, the first housing 11 and the second housing 12 together defining a receiving space for accommodating a single battery cell. The second housing 12 may be a hollow structure with one end open, and the first housing 11 may be a plate-like structure, the first housing 11 covering the open side of the second housing 12 so that the first housing 11 and the second housing 12 together define the receiving space; the first housing 11 and the second housing 12 may also be hollow structures with one side open, the open side of the first housing 11 covering the open side of the second housing 12.

[0094] In some embodiments, the first support member 13 may be a wall portion of the first housing 11, or the first support member 13 may be disposed on the wall portion of the first housing 11; the second support member 14 may be located inside the housing 10a and connected to the housing 10a. The second support member 14, the first support member 13, and the first housing 11 enclose a first receiving space Q1, in which the first battery cell assembly 20 is received; the second support member 14 and the second housing 12 enclose a second receiving space Q2, in which the second battery cell assembly 30 is received.

[0095] In some embodiments, the first housing 11 may include a bottom wall 111, two first side walls 112 disposed opposite each other along a third direction X, and two second side walls 113 disposed opposite each other along a second direction Y. The bottom wall 111, the two first side walls 112, and the two second side walls 113 form a receiving structure with a first opening facing the second housing 12. A second support member 14 is spaced apart from the bottom wall 111 in a first direction Z. The first support member 13 may be at least a part of the bottom wall 111, or the first support member 13 may be disposed on the inner surface of the bottom wall 111. The second support member 14 is connected to the two first side walls 112, and the first battery cell assembly 20 is located between the two first side walls 112. The third direction X, the second direction Y, and the first direction Z are perpendicular to each other. A first expansion beam 15 is disposed between the two second side walls 113.

[0096] In some embodiments, the second housing 12 may include a top wall 121, two third side walls 122 disposed opposite each other along a third direction X, and two fourth side walls 123 disposed opposite each other along a second direction Y. The top wall 121, the two third side walls 122, and the two fourth side walls 123 form a receiving structure with a second opening. The top wall 121 and the bottom wall 111 are disposed opposite each other in a first direction Z. The first opening of the first housing 11 and the second opening of the second housing 12 are engaged to form a receiving space. The second battery cell assembly 30 is located between the two third side walls 122 and between the top wall 121 and the second support member 14. The second expansion beam 16 is disposed between the two fourth side walls 123.

[0097] The first battery cell assembly 20 and the second battery cell assembly 30 are arranged in layers along the first direction Z so as to utilize the space inside the housing 10a in the first direction Z so that the battery device 100 can have a high energy density.

[0098] In some embodiments, the first battery cell assembly 20 includes a plurality of first battery cells 21 stacked along the second direction Y. The plurality of first battery cells 21 can be connected in series, in parallel, or in a mixed manner. A mixed manner means that some of the plurality of first battery cells 21 are connected in series and some in parallel. The second battery cell assembly 30 includes a plurality of second battery cells 31 stacked along the second direction Y. The plurality of second battery cells 31 can be connected in series, in parallel, or in a mixed manner.

[0099] In some embodiments, the battery device 100 may also include other structures. For example, the battery device 100 may also include a first busbar and a second busbar, wherein the first busbar is used to realize electrical connection between a plurality of first battery cells 21 and the second busbar is used to realize electrical connection between a plurality of second battery cells 31.

[0100] The first expansion beam 15 is a beam used to resist the expansion deformation of the first battery cell assembly 20. The first battery cell assembly 20 has a large expansion force in the second direction Y. The first expansion beam 15 is located at the end of the first battery cell assembly 20 in the second direction Y, so as to resist the expansion force of the first battery cell assembly 20 in the second direction Y. In some embodiments, the first expansion beam 15 may be provided at one end of the first battery cell assembly 20 in the second direction Y, or there may be two first expansion beams 15, with the two first expansion beams 15 respectively located at two opposite ends of the first battery cell assembly 20 in the second direction Y.

[0101] The second expansion beam 16 is a beam used to resist the expansion deformation of the second battery cell assembly 30. The second battery cell assembly 30 has a large expansion force in the second direction Y. The second expansion beam 16 is located at the end of the second battery cell assembly 30 in the second direction Y, so as to resist the expansion force of the second battery cell assembly 30 in the second direction Y. In some embodiments, the second expansion beam 16 may be provided at one end of the second battery cell assembly 30 in the second direction Y, or there may be two second expansion beams 16, with the two second expansion beams 16 respectively located at two opposite ends of the second battery cell assembly 30 in the second direction Y.

[0102] In some embodiments, the first support member 13 may be a metal part with a certain strength to support the first battery cell assembly 20. For example, the material of the first support member 13 may be aluminum alloy, steel, etc. The second support member 14 may be a metal part with a certain strength to support the second battery cell assembly 30. For example, the material of the second support member 14 may be aluminum alloy, steel, etc.

[0103] In some embodiments, the first expansion beam 15 can be a metal component with a certain strength and deformation resistance, such as aluminum or aluminum alloy, to resist the expansion force of the first battery cell assembly 20. The second expansion beam 16 can be a metal component with a certain strength and deformation resistance, such as aluminum or aluminum alloy, to resist the expansion force of the second battery cell assembly 30.

[0104] In some embodiments, the first expansion beam 15 may be welded to the first support member 13 to ensure a secure connection between the first expansion beam 15 and the first support member 13. The second expansion beam 16 may be welded to the second support member 14 to ensure a secure connection between the second expansion beam 16 and the second support member 14.

[0105] The first expansion beam 15 and the second expansion beam 16 are connected as one unit. The first expansion beam 15 can be threaded, snap-fitted or welded to the second expansion beam 16 to make the connection between the first expansion beam 15 and the second expansion beam 16 firm.

[0106] According to the battery device 100 of the present application embodiment, the first expansion beam 15 and the second expansion beam 16 are connected as one unit, which can improve the overall strength of the structure after the first expansion beam 15 and the second expansion beam 16 are connected, improve the connection reliability between the first expansion beam 15 and the first support member 13, and the connection reliability between the second expansion beam 16 and the second support member 14, and facilitate the improvement of the resistance to the expansion deformation of the first battery cell assembly 20 and the expansion deformation of the second battery cell assembly 30, thereby improving the reliability of the battery device 100.

[0107] Please refer to Figure 2and Figure 3 and further refer to Figure 4 and Figure 5 , Figure 4 This is a cross-sectional view of a portion of the structure of a battery device provided in some embodiments of this application. Figure 5 The diagram shows the structure of the first expansion beam and the second expansion beam provided in some embodiments of this application.

[0108] According to some embodiments of this application, the first expansion beam 15 includes a first portion 15a and a second portion 15b distributed along a first direction Z. The first portion 15a connects the second portion 15b and the first support member 13. The second portion 15b is located on the side of the second expansion beam 16 opposite to the second battery cell assembly 30 and is connected to the second expansion beam 16.

[0109] The first part 15a and the second part 15b are distributed along the first direction Z, and the first part 15a and the second part 15b are connected to each other. For example, the first part 15a can be welded to the second part 15b, or the first part 15a can be integrally formed with the second part 15b.

[0110] Along the second direction Y, the first portion 15a at least partially overlaps with the first battery cell assembly 20, and the second portion 15b at least partially overlaps with the second battery cell assembly 30.

[0111] Along the second direction Y, the second expansion beam 16 is located between the second part 15b and the second battery cell assembly 30. On the one hand, this facilitates the connection between the first expansion beam 15 and the second expansion beam 16, and on the other hand, it reduces the interference of the first expansion beam 15 on the assembly of the second expansion beam 16 and the second battery cell assembly 30.

[0112] In the first direction Z, the first expansion beam 15 passes over the second support member 14 and connects to the second expansion beam 16, so that the first expansion beam 15 and the second expansion beam 16 have a large connection area in the first direction Z. When the second battery cell assembly 30 transmits the expansion force to the second expansion beam 16, the expansion force can be transmitted to the first expansion beam 15 through the second expansion beam 16. Thus, the first expansion beam 15 absorbs part of the expansion force acting on the second expansion beam 16 by the second battery cell assembly 30, so as to reduce the impact of the expansion force on the connection between the second expansion beam 16 and the second support member 14, so that the structure after the first expansion beam 15 and the second expansion beam 16 are connected can jointly resist the force of the second battery cell assembly 30. Meanwhile, when the first battery cell assembly 20 transmits the expansion force to the first expansion beam 15, the expansion force can be transmitted to the second expansion beam 16 via the first expansion beam 15. The second expansion beam 16 absorbs part of the expansion force exerted by the first battery cell assembly 20 on the first expansion beam 15, so as to reduce the impact of the expansion force on the connection between the first expansion beam 15 and the first support member 13, so that the structure after the first expansion beam 15 and the second expansion beam 16 are connected can jointly resist the force exerted by the first battery cell assembly 20.

[0113] In the above scheme, the second part 15b is located on the side of the second expansion beam 16 away from the second battery cell assembly 30. The second part 15b is connected to the second expansion beam 16, and the first part 15a connects the second part 15b and the first support member 13, so that the first expansion beam 15 and the second expansion beam 16 have a large overlap area in the second direction Y, which facilitates the improvement of the overall strength of the structure after the first expansion beam 15 and the second expansion beam 16 are connected, and further improves the resistance to the expansion force of the first battery cell assembly 20 and the expansion force of the second battery cell assembly 30.

[0114] Please refer to Figure 4 and further refer to Figure 6 , Figure 6 This is a schematic diagram illustrating the assembly state of the first expansion beam and the second expansion beam according to some embodiments of this application. According to some embodiments of this application, the second part 15b and the second expansion beam 16 are connected by a first fastener 17.

[0115] The first fastener 17 can be a pin, bolt, etc., or the first fastener 17 can also be a weld mark formed after the second part 15b is welded to the second expansion beam 16.

[0116] In the above scheme, the second part 15b and the second expansion beam 16 are connected by the first fastener 17, so that the second part 15b and the second expansion beam 16 have high connection stability.

[0117] Please refer to Figure 4According to some embodiments of this application, the second part 15b is provided with a through hole 151, the second expansion beam 16 is provided with a threaded hole 161, and the first fastener 17 passes through the through hole 151 and is threadedly connected to the threaded hole 161.

[0118] The through hole 151 can penetrate the second part 15b along the second direction Y to facilitate the insertion of the first fastener 17.

[0119] The threaded hole 161 can be a threaded hole opened on the second expansion beam 16, or the threaded hole 161 can be a threaded sleeve provided on the second expansion beam 16.

[0120] The first fastener 17 can be a bolt or screw, etc., and one end of the first fastener 17 passes through the through hole 151 and is threadedly connected to the threaded hole 161.

[0121] In the above scheme, the first fastener 17 passes through the through hole 151 and is threadedly connected to the threaded hole 161, which is convenient to operate, easy to assemble and disassemble, and convenient to repair and replace.

[0122] In some embodiments, the number of through holes 151 can be multiple, and the multiple through holes 151 can be spaced apart along the first direction Z and the third direction X; correspondingly, the number of threaded holes 161 can be multiple, and the multiple threaded holes 161 correspond one-to-one with the multiple through holes 151; the number of first fasteners 17 can be multiple, and a first fastener 17 passes through a through hole 151 and is threadedly connected to a threaded hole 161.

[0123] Please refer to Figure 4 and Figure 5 According to some embodiments of this application, along the second direction Y, the thickness of the second portion 15b is less than the thickness of the first portion 15a.

[0124] The thickness direction of the first expansion beam 15 is parallel to the second direction Y, and the thickness directions of the second part 15b and the first part 15a are both parallel to the thickness direction of the first expansion beam 15.

[0125] The second portion 15b has a second surface 153 facing the second battery cell assembly 30 and a fourth surface 154 facing away from the second battery cell assembly 30, the second surface 153 and the fourth surface 154 being disposed opposite to each other along a second direction Y. Along the second direction Y, the first portion 15a may protrude from the second surface 153, or the first portion 15a may protrude from the fourth surface 154, or the first portion 15a may protrude from both the second surface 153 and the fourth surface 154.

[0126] Optionally, the first portion 15a has a fifth surface 155 facing away from the first battery cell assembly 20, and the fifth surface 155 is coplanar with the fourth surface 154.

[0127] In the above scheme, the thickness of the second part 15b is less than the thickness of the first part 15a, so as to reduce the space occupied by the structure after the second part 15b is connected to the second expansion beam 16 in the second direction Y, so that the battery device 100 can have a higher energy density.

[0128] Please refer to Figure 4 and further refer to Figure 7 and Figure 8 , Figure 7 Cross-sectional views of the first and second expansion beams in their assembled state, provided for some embodiments of this application. Figure 8 for Figure 4 A magnified view of part A.

[0129] According to some embodiments of this application, the first part 15a has a first surface 152 facing the first battery cell assembly 20, the second part 15b has a second surface 153 facing the second battery cell assembly 30, a stepped surface 156 is formed between the first surface 152 and the second surface 153, and the second expansion beam 16 overlaps the stepped surface 156.

[0130] The first surface 152 is the surface of the first part 15a that is close to the first battery cell assembly 20. The first surface 152 can contact the first battery cell assembly 20, or the first surface 152 can be connected to the first battery cell assembly 20 through a separator (buffer pad or heat insulation pad, etc.).

[0131] The second surface 153 and the first surface 152 are located on the same side of the first expansion beam 15 in the second direction Y. Along the second direction Y, the first portion 15a extends beyond the second surface 153, such that a stepped surface 156 is formed between the first surface 152 and the second surface 153.

[0132] The step surface 156 is positioned facing the second expansion beam 16. The two ends of the step surface 156 in the second direction Y are respectively connected to the first surface 152 and the second surface 153. The second surface 153 and the step surface 156 form an assembly space. When the second expansion beam 16 is assembled with the first expansion beam 15, a part of the second expansion beam 16 can be placed in the assembly space. The second expansion beam 16 is placed on the step surface 156 to achieve the assembly positioning of the second expansion beam 16.

[0133] In the above scheme, by forming a stepped surface 156 between the first surface 152 and the second surface 153, the second expansion beam 16 overlaps the stepped surface 156, which can realize the assembly positioning of the second expansion beam 16, so as to improve assembly efficiency and assembly stability.

[0134] Please refer to Figure 7According to some embodiments of this application, the first part 15a has a first surface 152 facing the first battery cell assembly 20, and the second expansion beam 16 has a third surface 162 facing the second battery cell assembly 30, the third surface 162 being coplanar with the first surface 152.

[0135] The third surface 162 is the surface of the second expansion beam 16 that is close to the second battery cell assembly 30. The third surface 162 can contact the second battery cell assembly 30, or the third surface 162 can be connected to the second battery cell assembly 30 through a separator (buffer pad or heat insulation pad, etc.).

[0136] The coplanarity of the third surface 162 and the first surface 152 means that the third surface 162 and the first surface 152 are approximately coplanar, allowing for a certain amount of machining error.

[0137] The third surface 162 corresponds to the second battery cell assembly 30, and the first surface 152 corresponds to the first battery cell assembly 20. The third surface 162 and the first surface 152 are coplanar. The second battery cell 31 can be positioned flush with the first battery cell 21 in the second direction Y, so that the dimensions of the second battery cell assembly 30 and the first battery cell assembly 20 in the second direction Y can be designed to be the same.

[0138] In the above scheme, the third surface 162 is coplanar with the first surface 152, and the second expansion beam 16 and the first expansion beam 15 can correspond to the second battery cell assembly 30 and the first battery cell assembly 20 with the same structure, which is convenient for processing and manufacturing and easy for assembly.

[0139] Please refer to Figure 4 , Figure 7 and Figure 8 According to some embodiments of this application, the first expansion beam 15 is a hollow structure and the second expansion beam 16 is a hollow structure.

[0140] The first expansion beam 15 has a cavity inside, which facilitates the absorption of the expansion force of the first battery cell assembly 20 by the first expansion beam 15, and the weight of the first expansion beam 15 can be relatively light.

[0141] In some embodiments, the interior of the first expansion beam 15 is provided with reinforcing ribs, which divide the interior of the first expansion beam 15 into multiple chambers; the provision of reinforcing ribs can enhance the strength of the first expansion beam 15 so as to resist the expansion force of the first battery cell assembly 20.

[0142] The second expansion beam 16 has a cavity inside, which facilitates the absorption of the expansion force of the second battery cell assembly 30, and the weight of the second expansion beam 16 can be relatively light.

[0143] In some embodiments, the interior of the second expansion beam 16 is provided with reinforcing ribs, which divide the interior of the second expansion beam 16 into multiple chambers; the provision of reinforcing ribs can enhance the strength of the second expansion beam 16 so as to resist the expansion force of the second battery cell assembly 30.

[0144] In the above scheme, the first expansion beam 15 is a hollow structure and the second expansion beam 16 is a hollow structure. While meeting the strength requirements, the weight of the box assembly 10 can be reduced, which facilitates the reduction of the weight of the battery device 100.

[0145] According to some embodiments of this application, the first expansion beam 15 is an integral extrusion structure, and the second expansion beam 16 is an integral extrusion structure.

[0146] The first expansion beam 15 is an integrally extruded structure, which can be integrally extruded from a base material using an extrusion device. The material of the first expansion beam 15 can be aluminum alloy, which has high strength and good ductility.

[0147] The second expansion beam 16 is an integrally extruded structure, which can be integrally extruded from the substrate using an extrusion device. The material of the second expansion beam 16 can be aluminum alloy, which has high strength and good ductility.

[0148] In the above scheme, the first expansion beam 15 is an integral extrusion structure and the second expansion beam 16 is an integral extrusion structure, which is convenient for processing and manufacturing, and the material is evenly distributed. The first expansion beam 15 and the second expansion beam 16 each have high overall strength.

[0149] Please refer to Figure 4 , Figure 5 and Figure 7 According to some embodiments of this application, a protrusion 157 is formed on the side of the first expansion beam 15 opposite to the first battery cell assembly 20, and the protrusion 157 is connected to the first support member 13.

[0150] In some embodiments, the first expansion beam 15 includes a body 150 and a protrusion 157. The body 150 includes a first portion 15a and a second portion 15b. The protrusion 157 is a protruding structure formed on the side of the first portion 15a away from the first battery cell assembly 20. The protrusion 157 is located at the end of the first portion 15a away from the second portion 15b.

[0151] In some embodiments, the protrusion 157 has a first end face facing the first support member 13, and the first portion 15a has a second end face facing the first support member 13. The first end face and the second end face are flush to facilitate the assembly and positioning of the first expansion beam 15 and the first support member 13.

[0152] In some embodiments, the protrusion 157 may be welded to the first support member 13.

[0153] In the above scheme, the protrusion 157 is formed on the side of the first expansion beam 15 away from the first battery cell assembly 20 and is connected to the first support member 13. This can improve the deformation resistance of the first expansion beam 15 and facilitate the absorption of the expansion force of the first battery cell assembly 20 and the force transmitted to the first expansion beam 15 by the second expansion beam 16.

[0154] Please refer to Figure 9 , Figure 9 The images show cross-sectional views of a first support member and a second support member provided in some embodiments of this application. According to some embodiments of this application, the first support member 13 has a first flow channel 131 formed inside, which is used to contain a heat exchange medium; and / or, the second support member 14 has a second flow channel 141 formed inside, which is used to contain a heat exchange medium.

[0155] The first support member 13 has a hollow structure, and the first flow channel 131 is formed inside the first support member 13 to accommodate the heat exchange medium.

[0156] The first support member 13 can be integrally extruded to form a first flow channel 131 inside the first support member 13, which facilitates processing and manufacturing. During the extrusion molding process of the first support member 13, reinforcing ribs can be formed inside the first support member 13 to improve the overall strength of the first support member 13.

[0157] After the battery device 100 is assembled, the first flow channel 131 can contain a heat exchange medium to facilitate heat exchange with the first battery cell assembly 20 via the first support structure. For example, when the heat exchange medium is a cooling medium, the low temperature of the heat exchange medium is transferred to the first battery cell assembly 20 via the first support member 13, which can reduce the temperature of the first battery cell assembly 20. Alternatively, when the heat exchange medium is a heating medium, the high temperature of the heat exchange medium is transferred to the first battery cell assembly 20 via the first support member 13, which can increase the temperature of the first battery cell assembly 20.

[0158] The second support member 14 can be integrally extruded to form a second flow channel 141 inside the second support member 14, which facilitates processing and manufacturing. During the extrusion molding process of the second support member 14, reinforcing ribs can be formed inside the second support member 14 to improve the overall strength of the second support member 14.

[0159] After the battery device 100 is assembled, the second flow channel 141 can contain a heat exchange medium to facilitate heat exchange with the second battery cell assembly 30 via the second support structure. For example, when the heat exchange medium is a cooling medium, the low temperature of the heat exchange medium is transferred to the second battery cell assembly 30 via the second support member 14, which can reduce the temperature of the second battery cell assembly 30. Alternatively, when the heat exchange medium is a heating medium, the high temperature of the heat exchange medium is transferred to the second battery cell assembly 30 via the second support member 14, which can increase the temperature of the second battery cell assembly 30.

[0160] In the above scheme, the heat exchange medium contained in the first flow channel 131 can be used to regulate the temperature of the first battery cell assembly 20 and improve the cycle performance of the first battery cell assembly 20; the heat exchange medium contained in the second flow channel 141 can be used to regulate the temperature of the second battery cell assembly 30 and improve the cycle performance of the second battery cell assembly 30.

[0161] Please refer to Figure 3 and Figure 5 According to some embodiments of this application, there are two first expansion beams 15, which are spaced apart along the second direction Y, and the first battery cell assembly 20 is disposed between the two first expansion beams 15; there are two second expansion beams 16, which are spaced apart along the second direction Y, and the second battery cell assembly 30 is disposed between the two second expansion beams 16.

[0162] The first battery cell assembly 20 may include a plurality of first battery cells 21 stacked along the second direction Y. The first battery cell assembly 20 has a large expansion force in the second direction Y. Two first expansion beams 15 are respectively located at two ends of the first battery cell assembly 20 in the second direction Y. The two first expansion beams 15 can cooperate to constrain the expansion deformation of the first battery cell assembly 20 in the second direction Y.

[0163] The second battery cell assembly 30 may include a plurality of second battery cells 31 stacked along the second direction Y. The second battery cell assembly 30 has a large expansion force in the second direction Y. Two second expansion beams 16 are respectively located at the two ends of the second battery cell assembly 30 in the second direction Y. The two second expansion beams 16 can cooperate to constrain the expansion deformation of the second battery cell assembly 30 in the second direction Y.

[0164] In the above scheme, two first expansion beams 15 are spaced apart along the second direction Y, and two second expansion beams 16 are spaced apart along the second direction Y. The structure formed by connecting the first expansion beams 15 and the second expansion beams 16 can be distributed at both ends in the second direction Y, so as to resist the expansion force of the first battery cell assembly 20 and the second battery cell assembly 30 in the second direction Y, thereby improving the reliability of the battery device 100.

[0165] According to some embodiments of this application, the outer peripheral surface of the housing 10a is provided with a mounting beam 18, which is used to connect to the electrical device body. For example, when the electrical device is a vehicle, the mounting beam 18 can be connected to the vehicle frame through a second locking member.

[0166] According to some embodiments of this application, this application also provides an electrical device that includes a battery device 100 provided according to any of the above embodiments.

[0167] According to some embodiments of this application, please refer to Figures 2 to 9 This application provides a battery device 100, which includes a first battery cell assembly 20, a second battery cell assembly 30, and a housing assembly 10.

[0168] The housing assembly 10 includes a first housing 11 and a second housing 12, which are fastened together to form an accommodating space. A first battery cell assembly 20 and a second battery cell assembly 30 are disposed in the accommodating space, and the first battery cell assembly 20 and the second battery cell assembly 30 are spaced apart along a first direction Z.

[0169] The first housing 11 includes a bottom wall 111, and the second housing 12 includes a top wall 121. The bottom wall 111 and the top wall 121 are arranged opposite each other along the first direction Z.

[0170] The housing assembly 10 includes a first support component 13, a second support component 14, a first expansion beam 15, and a second expansion beam 16; the first support component 13 is the bottom wall 111, which supports the first battery cell assembly 20 along the first direction Z; the second support component 14 is located between the first battery cell assembly 20 and the second battery cell assembly 30, and supports the second battery cell assembly 30.

[0171] There are two first expansion beams 15, which are spaced apart along the second direction Y. A first battery cell assembly 20 is disposed between the two first expansion beams 15, and the first expansion beams 15 are connected to the first support member 13. There are also two second expansion beams 16, which are spaced apart along the second direction Y. A second battery cell assembly 30 is disposed between the two second expansion beams 16, and the second expansion beams 16 are connected to the second support member 14. On the same side of the second battery cell assembly 30 along the second direction Y, one first expansion beam 15 and one second expansion beam 16 are correspondingly arranged, and the first expansion beam 15 is connected to the corresponding second expansion beam 16.

[0172] The first expansion beam 15 includes a first portion 15a and a second portion 15b distributed along a first direction Z. The first portion 15a connects the second portion 15b and the first support member 13. The second portion 15b is located on the side of the second expansion beam 16 opposite to the second battery cell assembly 30. The second portion 15b is provided with a through hole 151, and the second expansion beam 16 is provided with a threaded hole 161. A first fastener 17 passes through the through hole 151 and is threadedly connected to the threaded hole 161.

[0173] Along the second direction Y, the thickness of the second portion 15b is less than the thickness of the first portion 15a. The first portion 15a has a first surface 152 facing the first battery cell assembly 20, and the second portion 15b has a second surface 153 facing the second battery cell assembly 30. A stepped surface 156 is formed between the first surface 152 and the second surface 153, and the second expansion beam 16 overlaps the stepped surface 156. The first portion 15a has a first surface 152 facing the first battery cell assembly 20, and the second expansion beam 16 has a third surface 162 facing the second battery cell assembly 30. The third surface 162 is coplanar with the first surface 152.

[0174] According to the battery device 100 of this application embodiment, the first expansion beam 15 has a large connection area with the second expansion beam 16 in the first direction Z. The first expansion beam 15 is connected to the second expansion beam 16 on the side of the second expansion beam 16 away from the second battery cell assembly 30, so as to improve the overall strength of the structure after the first expansion beam 15 and the second expansion beam 16 are connected, and facilitate the structure after the first expansion beam 15 and the second expansion beam 16 are connected to resist the expansion force of the first battery cell assembly 20 and the second battery cell assembly 30. The second part 15b is connected to the first part 15a by the first fastener 17, which facilitates assembly and disassembly, and is convenient for maintenance and replacement. By forming a stepped surface 156 between the first surface 152 and the second surface 153, the second expansion beam 16 overlaps the stepped surface 156, which can realize the assembly positioning of the second expansion beam 16, so as to improve assembly efficiency and assembly stability. The third surface 162 is coplanar with the first surface 152. The second expansion beam 16 and the first expansion beam 15 can correspond to the second battery cell assembly 30 and the first battery cell assembly 20 with the same structure, which is convenient for processing and manufacturing and easy for assembly.

[0175] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: A first battery cell assembly and a second battery cell assembly are arranged at intervals along a first direction; The housing assembly includes a first support component, a second support component, a first expansion beam, and a second expansion beam; The first support member supports the first battery cell assembly, and along the first direction, the second support member is located between the first battery cell assembly and the second battery cell assembly, and the second support member supports the second battery cell assembly. The first expansion beam is disposed at the end of the first battery cell assembly in the second direction and is connected to the first support member. The second expansion beam is disposed at the end of the second battery cell assembly in the second direction and is connected to the second support member. The second direction is perpendicular to the first direction. The first expansion beam is connected to the second expansion beam.

2. The battery device according to claim 1, characterized in that, The first expansion beam includes a first portion and a second portion distributed along the first direction. The first portion connects the second portion and the first support member. The second portion is located on the side of the second expansion beam opposite to the second battery cell assembly and is connected to the second expansion beam.

3. The battery device according to claim 2, characterized in that, The second part is connected to the second expansion beam by a first fastener.

4. The battery device according to claim 3, characterized in that, The second part is provided with a through hole, the second expansion beam is provided with a threaded hole, and the first fastener passes through the through hole and is threadedly connected to the threaded hole.

5. The battery device according to claim 2, characterized in that, Along the second direction, the thickness of the second portion is less than the thickness of the first portion.

6. The battery device according to claim 5, characterized in that, The first portion has a first surface facing the first battery cell assembly, the second portion has a second surface facing the second battery cell assembly, a stepped surface is formed between the first surface and the second surface, and the second expansion beam overlaps the stepped surface.

7. The battery device according to claim 2, characterized in that, The first portion has a first surface facing the first battery cell assembly, and the second expansion beam has a third surface facing the second battery cell assembly, the third surface being coplanar with the first surface.

8. The battery device according to claim 1, characterized in that, The first expansion beam is a hollow structure, and the second expansion beam is a hollow structure.

9. The battery device according to claim 1, characterized in that, The first expansion beam is an integral extrusion structure, and the second expansion beam is an integral extrusion structure.

10. The battery device according to claim 1, characterized in that, A protrusion is formed on the side of the first expansion beam opposite to the first battery cell assembly, and the protrusion is connected to the first support member.

11. The battery device according to claim 1, characterized in that, The first support member has a first flow channel formed inside, the first flow channel being used to contain the heat exchange medium; and / or, The second support component has a second flow channel inside, which is used to contain the heat exchange medium.

12. The battery device according to claim 1, characterized in that, The number of the first expansion beams is two, and the two first expansion beams are spaced apart along the second direction, with the first battery cell assembly disposed between the two first expansion beams; The number of the second expansion beams is two, and the two second expansion beams are spaced apart along the second direction, with the second battery cell assembly disposed between the two second expansion beams.

13. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1-12.

Images