Battery device and electric device

Abstract

The embodiment of the invention provides a battery device and a power utilization device. The battery device comprises a box body, a bracket, a first battery cell assembly and a second battery cell assembly, the box body comprises a first box body and a second box body, and the first box body and the second box body are oppositely arranged in the first direction; a first containing space is defined by the first box body and the support, and a second containing space is defined by the second box body and the support. The first battery cell assembly is arranged in the first accommodating space, and the second battery cell assembly is arranged in the second accommodating space. The first box body comprises a bottom wall and two first side walls oppositely arranged in the second direction, the bottom wall supports the first battery monomer assembly and is connected with the two first side walls, each first side wall is provided with a first outer surface, a first inner surface and a first end face deviating from the bottom wall, and the first end face is located between the first outer surface and the first inner surface; the bracket is connected to the first end face and supports the second battery cell assembly. According to the technical scheme, the energy density 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] Energy density is a crucial factor in the manufacturing process of battery devices. Therefore, improving the energy density of battery devices is a pressing technical challenge in battery technology. Summary of the Invention

[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, embodiments of this application provide a battery device, which includes a housing, a bracket, a first battery cell assembly, and a second battery cell assembly. The housing includes a first housing and a second housing, which are disposed opposite to each other along a first direction and are fastened together. The bracket is disposed within the housing, with the first housing and the bracket forming a first receiving space, and the second housing and the bracket forming a second receiving space. The first battery cell assembly is disposed in the first receiving space, and the second battery cell assembly is disposed in the second receiving space. The first housing includes a bottom wall and two first side walls disposed opposite to each other along a second direction. The bottom wall supports the first battery cell assembly and connects the two first side walls. Each first side wall has a first outer surface and a first inner surface opposite to each other along its thickness direction, and a first end face away from the bottom wall. The first end face is located between the first outer surface and the first inner surface. The bracket is connected to the first end face and supports the second battery cell assembly. The second direction is perpendicular to the first direction.

[0007] According to the battery device of this application embodiment, a first housing and a second housing are arranged opposite to each other along a first direction. A bracket is disposed inside the housing and divides the interior of the housing into a first receiving space and a second receiving space. A first battery cell assembly is accommodated in the first receiving space, and a second battery cell assembly is accommodated in the second receiving space, so that the first battery cell assembly and the second battery cell assembly can be stacked in the first direction. Along the first direction, the bracket is disposed on the side of the first sidewall opposite to the bottom wall. The bracket can be located above the first sidewall and connected to the first end face of the first sidewall opposite to the bottom wall. No structure for connecting to the bracket is required on the first inner surface of the first sidewall, allowing the first battery cell assembly to be disposed close to the first inner surface. This reduces the distance between the first battery cell assembly and the first inner surface of the first sidewall, allowing for a larger number of first battery cell assemblies to be disposed inside the housing, thereby improving the space utilization between the two first sidewalls and increasing the volumetric energy density of the battery device.

[0008] According to some embodiments of this application, the bracket is provided with a first through hole, and a first threaded hole corresponding to the first through hole is provided on the first end face. The battery device also includes a first fastener, which passes through the first through hole and is connected to the first threaded hole to connect the bracket to the first side wall.

[0009] In the above scheme, the first through hole facilitates the insertion of the first fastener and improves assembly efficiency; the first threaded hole facilitates the assembly of the first fastener with the first end face, and the bracket and the first side wall have high connection stability, which is conducive to the assembly and disassembly of the bracket and the first side wall, and facilitates the maintenance and replacement of the first battery cell assembly or the second battery cell assembly.

[0010] According to some embodiments of this application, the second battery cell assembly is bonded to the bracket by an adhesive.

[0011] In the above scheme, the second battery cell assembly and the bracket are bonded together with an adhesive, which is simple and easy to operate.

[0012] According to some embodiments of this application, the bracket includes a bracket body and a protrusion. The bracket body carries a second battery cell assembly. The bracket body has a first surface facing away from the bottom wall. The protrusion protrudes from the first surface and is located between the first through hole and the second battery cell assembly along a second direction.

[0013] In the above solution, the protrusion protrudes from the first surface and can form a barrier between the first mounting hole and the second unit assembly, reducing the risk that the colloid will flow into the first through hole and affect the assembly of the first fastener and the first through hole.

[0014] According to some embodiments of this application, along the second direction, the distance between the first battery cell assembly and the first inner surface is W, which satisfies that W≤8mm.

[0015] In the above scheme, the distance between the first battery cell assembly and the first inner surface satisfies the above relationship. The distance between the first battery assembly and the first inner surface is small, so more first battery cell assemblies can be set, which improves the space utilization between the two first sidewalls and helps to improve the volumetric energy density of the battery device.

[0016] According to some embodiments of this application, a receiving groove is provided on the first outer surface, and the receiving groove extends to the first end face along the first direction; the second housing includes a top wall and two second side walls, the top wall and the bottom wall are arranged opposite to each other along the first direction, the two second side walls are spaced apart along the second direction, and the top wall connects the two second side walls; the second side wall has a connecting end away from the top wall, the connecting end is disposed in the receiving groove, and the connecting end is connected to the first side wall.

[0017] In the above scheme, the connecting end is set in the receiving groove and connected to the first side wall through the connecting end, so as to facilitate the assembly of the second box and the first box. For example, when assembling the second box and the first box, the connecting end of the second box can be inserted into the receiving groove along the first direction, which is simple to operate.

[0018] According to some embodiments of this application, the thickness of the connecting end is less than the thickness of the first sidewall.

[0019] In the above scheme, the first sidewall has a large thickness so that it still has high strength after the receiving groove is provided, so that the connection end and the first sidewall have high connection reliability.

[0020] According to some embodiments of this application, the connecting end does not protrude from the first outer surface in the direction from the first inner surface to the first outer surface.

[0021] In the above scheme, the connecting end does not protrude from the first outer surface, so that the structure after the connecting end is connected to the first sidewall occupies less assembly space and reduces the risk of interference between the connecting end and other components.

[0022] According to some embodiments of this application, the battery device further includes a first seal disposed in a receiving groove, and along a second direction, the first seal is disposed between the connecting end and the first sidewall.

[0023] In the above scheme, the first sealing element is disposed in the receiving groove and between the connecting end and the first side wall, so that the connecting end and the first side wall are sealed together to achieve the sealing between the second side wall and the first side wall. The first battery cell assembly and the second battery cell assembly share the same sealing structure, reducing the number of parts and saving manufacturing costs.

[0024] According to some embodiments of this application, the connecting end is provided with a second through hole, the groove wall of the receiving groove is provided with a second threaded hole corresponding to the second through hole, and the battery device further includes a second fastener, which passes through the second through hole and is connected to the second threaded hole to connect the connecting end to the first side wall.

[0025] In the above scheme, the second through hole facilitates the insertion of the second fastener and improves assembly efficiency; the second threaded hole facilitates the assembly of the second fastener with the groove wall of the receiving groove, and the connection end and the first side wall have high connection stability, which is conducive to the assembly and disassembly of the connection end and the first side wall, and facilitates the maintenance and replacement of the first battery cell assembly or the second battery cell assembly.

[0026] According to some embodiments of this application, the second fastener does not protrude from the first outer surface in the direction from the first inner surface to the first outer surface.

[0027] In the above scheme, the second fastener does not protrude from the first outer surface, reducing the space occupied by the structure after the second fastener connects the connecting end to the first side wall.

[0028] According to some embodiments of this application, a first flow channel is formed inside the bottom wall for containing a heat exchange medium; a second flow channel is formed inside the support for containing a heat exchange medium.

[0029] In the above scheme, the first flow channel is set up to facilitate the placement of a heat exchange medium within the first flow channel, which facilitates heat exchange with the first battery cell assembly through the heat exchange medium, thereby regulating the temperature of the first battery cell assembly; the second flow channel is set up to facilitate the placement of a heat exchange medium within the second flow channel, which facilitates heat exchange with the second battery cell assembly through the heat exchange medium placed within the second flow channel, thereby regulating the temperature of the second battery cell assembly; at the same time, since the support is located between the first battery cell assembly and the second battery cell assembly, the support can also regulate the temperature of the first battery cell assembly.

[0030] According to some embodiments of this application, a cavity is formed inside the first sidewall.

[0031] In the above scheme, the first sidewall is a hollow structure, which makes it lighter and easier to reduce the weight of the box and the overall weight of the battery device.

[0032] According to some embodiments of this application, the second housing has openings at both ends along a third direction, and the third direction, the second direction, and the first direction are perpendicular to each other; the housing also includes two third sidewalls arranged opposite each other along the third direction, and the first battery cell assembly and the second battery cell assembly are both disposed between the two third sidewalls; along the direction from the bottom wall to the first battery cell assembly, the third sidewall protrudes from the first sidewall, and the two third sidewalls respectively close the two openings.

[0033] In the above scheme, by setting a third sidewall, on the one hand, components such as explosion-proof valves, water-cooling connectors or high and low voltage connectors can be installed on the third sidewall, which facilitates the normal charging and discharging of the battery device; on the other hand, by closing the opening through the third sidewall, the space utilization rate of the battery device in the third direction can be improved, and the volumetric energy density of the battery device can be increased.

[0034] According to some embodiments of this application, the third sidewall has a second inner surface facing the second battery cell assembly, a second outer surface facing away from the second battery cell assembly, and a first side surface connecting the second inner surface and the second outer surface. The second housing includes two connecting portions, which are respectively located at both ends of the second housing along a third direction. The connecting portions form an opening and are connected to the first side surface.

[0035] In the above solution, the connection between the connecting part and the first side of the third side wall facilitates the improvement of the connection stability and sealing between the second housing and the third side wall.

[0036] According to some embodiments of this application, the connecting part is provided with a third through hole, the first side is provided with a third threaded hole, and the battery device further includes a third fastener, which passes through the third through hole and is connected to the third threaded hole to connect the connecting part to the third side wall.

[0037] In the above scheme, the setting of the third through hole facilitates the insertion of the third fastener and improves assembly efficiency; the setting of the third threaded hole facilitates the assembly of the third fastener with the first side, and the connection between the connecting part and the third side wall has high connection stability, which is conducive to the assembly and disassembly of the connecting part and the third side wall.

[0038] According to some embodiments of this application, the battery device further includes a second seal disposed between the connection portion and the first side.

[0039] In the above solution, by providing a second seal between the connecting part and the first side, the sealing performance between the connecting part and the first side can be improved, thereby improving the sealing performance of the battery device.

[0040] Secondly, embodiments of this application also provide an electrical device, which includes a battery device according to any of the above embodiments, the battery device being used to provide electrical energy.

[0041] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0042] 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.

[0043] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0044] Figure 2 This is an exploded view of the structure of a battery device provided in some embodiments of this application;

[0045] Figure 3 Cross-sectional views of a battery device provided for some embodiments of this application;

[0046] Figure 4 for Figure 3 A magnified view of part A;

[0047] Figure 5 for Figure 4 A magnified view of section B;

[0048] Figure 6 Cross-sectional views of a portion of the structure of a battery device provided in some embodiments of this application;

[0049] Figure 7 This is a partial structural schematic diagram of a battery device provided in some embodiments of this application;

[0050] Figure 8 This is a schematic diagram of the assembly of the connecting part and the third sidewall provided in some embodiments of this application.

[0051] Icons: 100 - Battery assembly; 10 - Housing; 10a - First receiving space; 10b - Second receiving space; 11 - First housing; 111 - Bottom wall; 1111 - First flow channel; 112 - First side wall; 112a - First outer surface; 112b - First inner surface; 112c - First end face; 112d - First threaded hole; 1121 - Cavity; 113 - Receiving groove; 1131 - Second threaded hole; 12 - Second housing; 121 - Top wall; 122 - Second side wall; 1221 - Connecting end; 1222 - Second through hole; 123 - Opening; 124 - Connecting part; 1241 - Third through hole; 13 - Third side wall; 131 - Second inner surface; 132 - Second outer surface; 133-First side surface; 133a-First flat surface; 133b-Second flat surface; 133c-Transition surface; 1331-Third threaded hole; 134-First part; 135-Second part; 20-Bracket; 21-First through hole; 22-Bracket body; 22a-First surface; 23-Protrusion; 24-Second flow channel; 31-First battery cell assembly; 32-Second battery cell assembly; 41-First fastener; 42-Second fastener; 43-Third fastener; 51-First seal; 52-Second seal; 200-Controller; 300-Motor; 1000-Vehicle; X-Third direction; Y-Second direction; Z-First direction. Detailed Implementation

[0052] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0053] 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 foregoing drawings of this application are intended to cover non-exclusive inclusion.

[0054] The terms "first," "second," etc., in the specification, claims, or the accompanying drawings of this application are used to distinguish different objects, rather than to describe a specific order or primary / secondary relationship.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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).

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.).

[0074] 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.

[0075] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0083] In some implementations, the electrode assembly is a stacked structure.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] The development of battery technology must consider multiple design factors simultaneously, such as reliability, discharge capacity, and charge / discharge rate. Additionally, the energy density of the battery device must also be considered. The energy density of a battery device includes volumetric energy density and gravimetric energy density.

[0091] In some embodiments, when the battery device includes two layers of battery cell assemblies, in order to facilitate the assembly of the two layers of battery cell assemblies, a boss is usually provided on the inner surface of the side wall of the lower housing that houses the lower battery cell assembly. The support that carries the upper battery cell assembly is connected to the boss, which makes it impossible to place the battery cell assembly in the space below the boss inside the lower housing, resulting in wasted space, low utilization of the internal space of the housing, and low volumetric energy density of the battery device.

[0092] In view of this, in order to solve the problem of low space utilization within the housing, resulting in low volumetric energy density of the battery device, this application provides a battery device including a housing, a support, a first battery cell assembly, and a second battery cell assembly. The housing includes a first housing and a second housing, which are arranged opposite to each other along a first direction and are fastened together. The support is disposed within the housing, with the first housing and the support forming a first receiving space, and the second housing and the support forming a second receiving space. The first battery cell assembly is disposed in the first receiving space, and the second battery cell assembly is disposed in the second receiving space. The first housing includes a bottom wall and two first side walls arranged opposite to each other along a second direction. The bottom wall supports the first battery cell assembly and connects to the two first side walls. Each first side wall has a first outer surface and a first inner surface opposite to each other along its thickness direction, and a first end face facing away from the bottom wall. The first end face is located between the first outer surface and the first inner surface. The support is connected to the first end face and supports the second battery cell assembly. The second direction is perpendicular to the first direction. This battery device has high space utilization within the housing and a high volumetric energy density.

[0093] In this battery device, a first housing and a second housing are arranged opposite each other in a first direction. The first housing can serve as the lower housing, and the second housing can serve as the upper housing. A support is disposed within the housing and divides the interior of the housing into a first receiving space and a second receiving space. A first battery cell assembly is housed in the first receiving space, and a second battery cell assembly is housed in the second receiving space, so that the first and second battery cell assemblies can be stacked in the first direction. Along the first direction, the support is disposed on the side of the first sidewall facing away from the bottom wall. The support can be located above the first sidewall and connected to the first end face of the first sidewall facing away from the bottom wall. No structure for connecting to the support is needed on the first inner surface of the first sidewall, allowing the first battery cell assembly to be positioned close to the first inner surface. This reduces the distance between the first battery cell assembly and the first inner surface of the first sidewall, allowing for a larger number of first battery cell assemblies to be housed within the housing. This improves the space utilization between the two first sidewalls, thereby increasing the volumetric energy density of the battery device.

[0094] The battery device disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using the battery device disclosed in this application.

[0095] 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.

[0096] 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.

[0097] 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 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 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.

[0098] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0099] In some embodiments of this application, the battery device 100 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.

[0100] Please refer to Figures 2 to 5 , 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. Figure 4 for Figure 3 A magnified view of part A. Figure 5 for Figure 4 A partial enlarged view at point B. This application provides a battery device 100, which includes a housing 10, a support 20, a first battery cell assembly 31, and a second battery cell assembly 32. The housing 10 includes a first housing 11 and a second housing 12, which are arranged opposite to each other along a first direction Z and are fastened together. The support 20 is disposed within the housing 10, with the first housing 11 and the support 20 forming a first receiving space 10a, and the second housing 12 and the support 20 forming a second receiving space 10b. The first battery cell assembly 31 is disposed in the first receiving space 10a, and the second battery cell assembly 32 is disposed in the second receiving space 10b. The first housing 11 includes a bottom wall 111 and two first side walls 112 arranged opposite each other along the second direction Y. The bottom wall 111 supports the first battery cell assembly 31 and connects the two first side walls 112. The first side wall 112 has a first outer surface 112a and a first inner surface 112b opposite each other along its thickness direction, and a first end face 112c away from the bottom wall 111. The first end face 112c is located between the first outer surface 112a and the first inner surface 112b. A bracket 20 is connected to the first end face 112c and supports the second battery cell assembly 32. The second direction Y is perpendicular to the first direction Z.

[0101] Figures 2 to 5 In the diagram, the direction indicated by the letter Z can be a first direction, which can be parallel to the thickness direction of the bottom wall 111; the direction indicated by the letter Y can be a second direction, which can be perpendicular to the thickness direction of the bottom wall 111. The first direction Z can be the height direction of the battery device 100, and the second direction Y can be the width direction of the battery device 100.

[0102] The housing 10 provides space for housing the first battery cell assembly 31 and the second battery cell assembly 32.

[0103] The first housing 11 and the second housing 12 are arranged opposite to each other along the first direction Z, and the first housing 11 and the second housing 12 are fastened together so that the first housing 11 and the second housing 12 form a receiving space for accommodating the first battery cell assembly 31 and the second battery cell assembly 32. In some embodiments, the first direction Z can be a vertical direction, the first housing 11 can be a lower housing, and the second housing 12 can be an upper housing.

[0104] The first battery cell assembly 31 may include multiple first battery cells, which may be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that some of the multiple first battery cells are connected in series and others in parallel. The first battery cell assembly 31 may also include other structures; for example, it may include a first busbar for electrically connecting the multiple first battery cells.

[0105] The second battery cell assembly 32 may include multiple second battery cells, which may be connected in series, parallel, or a combination thereof. A combination thereof means that some of the multiple second battery cells are connected in series and others in parallel. The second battery cell assembly 32 may also include other structures, for example, it may also include a second busbar for realizing electrical connection between the multiple second battery cells.

[0106] The bracket 20 is a component used to support the second battery cell assembly 32. The bracket 20 has a certain strength. The material of the bracket 20 can be metal, such as aluminum alloy or stainless steel; the material of the bracket 20 can also be rigid non-metal such as engineering plastic.

[0107] The bracket 20 is disposed inside the housing 10, and the bracket 20 divides the internal space of the housing 10 into a first accommodating space 10a and a second accommodating space 10b. For example, the bottom wall 111, the two first side walls 112 and the bracket 20 form the first accommodating space 10a; the bracket 20 and the second housing 12 form the second accommodating space 10b.

[0108] The first inner surface 112b is the surface of the first sidewall 112 that forms the first receiving space 10a, and the first inner surface 112b faces the first battery cell assembly 31. The first outer surface 112a is the surface of the first sidewall 112 that faces away from the first receiving space 10a, and the first outer surface 112a faces away from the first battery cell assembly 31. The first end face 112c is located between the first outer surface 112a and the first inner surface 112b. The thickness direction of the first sidewall 112 is parallel to the second direction Y. The first end face 112c connects the first inner surface 112b and the first outer surface 112a. Alternatively, one end of the first end face 112c in the second direction Y can be connected to the first inner surface 112b, and the other end of the first end face 112c in the second direction Y can have a groove formed between it and the first outer surface 112a.

[0109] One end of the first sidewall 112 along the first direction Z is connected to the bottom wall 111, and the end face of the other end of the first sidewall 112 along the first direction Z forms a first end face 112c.

[0110] The bracket 20 is connected to the first end face 112c. The bracket 20 can be disposed on the side of the first side wall 112 away from the bottom wall 111. For example, the bracket 20 can be disposed above the first side wall 112.

[0111] The second battery cell assembly 32 is supported by the bracket 20, and the first battery cell assembly 31 is supported by the bottom wall 111. The bracket 20 is connected to the first end face 112c. During the assembly of the battery device 100, the assembly of the first battery cell assembly 31 with the bottom wall 111 and the assembly of the second battery cell assembly 32 with the bracket 20 can be carried out simultaneously, which can shorten the assembly waiting time and improve the assembly efficiency.

[0112] According to the battery device 100 of the present application embodiment, a first housing 11 and a second housing 12 are arranged opposite to each other along a first direction Z. A bracket 20 is disposed inside the housing 10 and divides the interior of the housing 10 into a first accommodating space 10a and a second accommodating space 10b. A first battery cell assembly 31 is accommodated in the first accommodating space 10a, and a second battery cell assembly 32 is accommodated in the second accommodating space 10b, so that the first battery cell assembly 31 and the second battery cell assembly 32 can be stacked in the first direction Z. Along the first direction Z, the bracket 20 is disposed on the side of the first side wall 112 facing away from the bottom wall 111. The bracket 20 can be located above the first side wall 112. The bracket 20 is connected to the first end face 112c of the first side wall 112 facing away from the bottom wall 111. The first inner surface 112b of the first side wall 112 does not need to be provided with a structure for connecting with the bracket 20. The first battery cell assembly 31 can be disposed close to the first inner surface 112b, so that the distance between the first battery cell assembly 31 and the first inner surface 112b of the first side wall 112 can be smaller. More first battery cell assemblies 31 can be disposed in the housing 10 to improve the space utilization between the two first side walls 112, thereby improving the volumetric energy density of the battery device 100.

[0113] Please refer to Figure 4 and Figure 5 According to some embodiments of this application, the bracket 20 is provided with a first through hole 21, and the first end face 112c is provided with a first threaded hole 112d corresponding to the first through hole 21. The battery device 100 also includes a first fastener 41, which passes through the first through hole 21 and is connected to the first threaded hole 112d to connect the bracket 20 to the first side wall 112.

[0114] The thickness direction of the bracket 20 can be parallel to the first direction Z. The first through hole 21 is a hole that passes through the bracket 20 along the first direction Z so that the first fastener 41 can be connected to the first side wall 112 after passing through the bracket 20.

[0115] The first threaded hole 112d can be a threaded hole opened on the first end face 112c, or the first threaded hole 112d can be a threaded hole of a threaded sleeve embedded in the first end face 112c.

[0116] The first fastener 41 can be a bolt or a fastener with a threaded section. The first fastener 41 is set along the first direction Z. After the threaded section of the first fastener 41 passes through the first through hole 21, it engages with the first threaded hole 112d to improve the connection stability between the bracket 20 and the first side wall 112.

[0117] In the above scheme, the first through hole 21 is provided to facilitate the insertion of the first fastener 41 and improve assembly efficiency; the first threaded hole 112d is provided to facilitate the assembly of the first fastener 41 and the first end face 112c; the bracket 20 and the first side wall 112 have high connection stability, which is conducive to the assembly and disassembly of the bracket 20 and the first side wall 112, and facilitates the maintenance and replacement of the first battery cell assembly 31 or the second battery cell assembly 32.

[0118] In some embodiments, there are multiple first through holes 21, which are spaced apart along a third direction X, and the third direction X, the second direction Y, and the first direction Z are perpendicular to each other. There are multiple first threaded holes 112d, which are spaced apart along a third direction X, and one first threaded hole 112d corresponds to one first through hole 21. There are multiple first fasteners 41, and one first fastener 41 mates with one first through hole 21 and one first threaded hole 112d. The arrangement of multiple first through holes 21, multiple first threaded holes 112d, and multiple first fasteners 41 allows the bracket 20 and the first sidewall 112 to have multiple connection positions in a third manner, which helps to improve the connection stability between the bracket 20 and the first sidewall 112.

[0119] According to some embodiments of this application, the second battery cell assembly 32 is bonded to the bracket 20 by an adhesive.

[0120] For example, when assembling the second battery cell assembly 32 with the bracket 20, an adhesive can be applied to the surface of the bracket 20 facing away from the bottom wall 111 to bond the second battery cell to the bracket 20, thereby achieving the assembly of the second battery cell assembly 32 with the bracket 20. As another example, when assembling the second battery cell assembly 32 with the bracket 20, an adhesive can be applied to the surface of the second battery cell assembly 32 facing the bracket 20 to bond the second battery cell to the bracket 20, thereby achieving the assembly of the second battery cell assembly 32 with the bracket 20.

[0121] In the above scheme, the second battery cell assembly 32 and the bracket 20 are bonded together with an adhesive, which is simple and easy to operate.

[0122] Please refer to Figure 5 According to some embodiments of this application, the bracket 20 includes a bracket body 22 and a protrusion 23. The bracket body 22 carries the second battery cell assembly 32. The bracket body 22 has a back wall 111 (see reference). Figure 3 The first surface 22a has a protrusion 23 protruding from it. Along the second direction Y, the protrusion 23 is located between the first through hole 21 and the second battery cell assembly 32.

[0123] The bracket body 22 can be cuboid, and the bracket body 22 is used to support the second battery cell assembly 32.

[0124] The first surface 22a is the surface of the support body 22 that is away from the bottom wall 111, and the second battery cell assembly 32 can be disposed on the first surface 22a.

[0125] The protrusion 23 protrudes from the first surface 22a in a direction away from the bottom wall 111. The protrusion 23 has a certain height in the first direction Z so as to block the colloid from moving toward the first through hole 21.

[0126] In some embodiments, there may be two protrusions 23, which are spaced apart along the second direction Y, and the second battery cell assembly 32 is disposed between the two protrusions 23. The two protrusions 23 are disposed one-to-one with the two first sidewalls 112. On the same projection plane perpendicular to the first direction Z, along the second direction Y, the orthographic projection of the protrusion 23 is located between the orthographic projection of the first through hole 21 corresponding to the first sidewall 112 and the orthographic projection of the second battery cell assembly.

[0127] In the above scheme, the protrusion 23 protrudes from the first surface 22a and can form a barrier between the first mounting hole and the second unit assembly, reducing the risk that the colloid will flow into the first through hole 21 and affect the assembly of the first fastener 41 and the first through hole 21.

[0128] Please refer to Figure 3According to some embodiments of this application, along the second direction Y, the distance between the first battery cell assembly 31 and the first inner surface 112b is W, which satisfies that W≤8mm.

[0129] In the figure, the dimension indicated by the letter W is the distance between the first battery cell assembly 31 and the first inner surface 112b in the second direction Y.

[0130] For example, the distance W between the first battery cell assembly 31 and the first inner surface 112b in the second direction Y can satisfy: 3mm≤W≤8mm. W can be any one or any two of 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, and 8mm.

[0131] In the above scheme, the distance between the first battery cell assembly 31 and the first inner surface 112b satisfies the above relationship (W≤8mm). The distance between the first battery assembly and the first inner surface 112b is small, so more first battery cell assemblies 31 can be set, which improves the space utilization between the two first sidewalls 112 and helps to improve the volumetric energy density of the battery device 100.

[0132] Please refer to Figures 3 to 5 According to some embodiments of this application, a receiving groove 113 is provided on the first outer surface 112a, and the receiving groove 113 extends to the first end face 112c along the first direction Z; the second housing 12 includes a top wall 121 and two second side walls 122, the top wall 121 and the bottom wall 111 are disposed opposite to each other along the first direction Z, the two second side walls 122 are spaced apart along the second direction Y, and the top wall 121 connects the two second side walls 122; the second side wall 122 has a connecting end 1221 away from the top wall 121, the connecting end 1221 is disposed in the receiving groove 113, and the connecting end 1221 is connected to the first side wall 112.

[0133] The receiving groove 113 is a groove formed on the first outer surface 112a. The receiving groove 113 extends along the first direction Z to the first end face 112c so that the connecting end 1221 can extend into the receiving groove 113 along the first direction Z.

[0134] In some embodiments, the first sidewall 112 has a second end face and a third end face disposed opposite to each other along a third direction X. The second end face and the third end face are located at opposite ends of the first sidewall 112 in the third direction. The second end face connects the first inner surface 112b and the first outer surface 112a, and the third end face connects the first inner surface 112b and the first outer surface 112a. The third direction X, the second direction Y, and the first direction Z are perpendicular to each other. The receiving groove 113 can extend from the second end face to the third end face to facilitate the assembly of the second housing 12 with the first sidewall 112.

[0135] The top wall 121 and the bottom wall 111 can be located at opposite ends of the housing 10 in the first direction Z. One end of the second side wall 122 in the first direction Z is connected to the top wall 121, and the other end of the second side wall 122 in the first direction Z forms a connecting end 1221.

[0136] The top wall 121, the two side walls, and the support 20 form a second accommodating space 10b.

[0137] In some embodiments, the connecting end 1221 is disposed in the receiving groove 113 and is connected to the groove wall of the receiving groove 113 in the second direction Y. For example, the connecting end 1221 is connected to the groove wall of the receiving groove 113 along the second direction Y.

[0138] In the above scheme, the connecting end 1221 is disposed in the receiving groove 113 and is connected to the first side wall 112 through the connecting end 1221, so as to facilitate the assembly of the second box 12 and the first box 11. For example, when assembling the second box 12 and the first box 11, the connecting end 1221 of the second box 12 can be inserted into the receiving groove 113 along the first direction Z, which is simple to operate.

[0139] According to some embodiments of this application, the material of the first housing can be aluminum, aluminum alloy, steel, stainless steel, etc.; the material of the second housing can be plastic, aluminum, steel, stainless steel, etc.

[0140] Optionally, the first housing is made of aluminum alloy.

[0141] Optionally, the second housing may be made of plastic.

[0142] Please refer to Figures 3 to 5 According to some embodiments of this application, the thickness of the connecting end 1221 is less than the thickness of the first sidewall 112.

[0143] The thickness direction of the connecting end 1221 is parallel to the thickness direction of the second sidewall 122, and the thickness direction of both the second sidewall 122 and the first sidewall 112 are parallel to the second direction Y.

[0144] In the above scheme, the thickness of the connecting end 1221 is less than the thickness of the first sidewall 112. The first sidewall 112 has a larger thickness so that it still has high strength after the receiving groove 113 is provided, so that the connecting end 1221 and the first sidewall 112 have high connection reliability.

[0145] According to some embodiments of this application, the thickness of the second sidewall 122 is less than the thickness of the first sidewall 112.

[0146] Please refer to Figures 3 to 5According to some embodiments of this application, the connecting end 1221 does not protrude from the first outer surface 112a in the direction from the first inner surface 112b to the first outer surface 112a.

[0147] When the second sidewall 122 is assembled with the corresponding first sidewall 112, the connecting end 1221 does not protrude from the first outer surface 112a of the corresponding first sidewall 112 in the direction from the first inner surface 112b to the first outer surface 112a, so that the connecting end 1221 does not occupy the space outside the first sidewall 112.

[0148] In the above scheme, the connecting end 1221 does not protrude from the first outer surface 112a, so that the structure after the connecting end 1221 is connected to the first side wall 112 occupies less assembly space and reduces the risk of interference between the connecting end 1221 and other components.

[0149] Please refer to Figure 6 , Figure 6 This is a cross-sectional view of a portion of the structure of a battery device provided in some embodiments of this application. According to some embodiments of this application, the battery device 100 further includes a first seal 51, which is disposed within a receiving groove 113 along the second direction Y, and is located between the connecting end 1221 and the first sidewall 112.

[0150] The first sealing element 51 can be a sealing gasket or sealant, which has a good sealing effect.

[0151] "Along the second direction Y, the first sealing element 51 is disposed between the connecting end 1221 and the first side wall 112" means that the inner surface of the connecting end 1221 is sealed to the groove wall of the receiving groove 113 in the second direction Y. The inner surface of the connecting end 1221 can be the surface of the connecting end 1221 facing the inside of the housing 10. Compared with the sealing fit between the bracket 20 and the first side wall 112, and the sealing fit between the second side wall 122 and the first side wall 112, after the inner surface of the connecting end 1221 and the groove wall of the receiving groove 113 are sealed to each other in the second direction Y by the first sealing element 51, the seal between the second housing 12 and the first housing 11 can be achieved by the first sealing element 51 alone, without the need for additional sealing elements, thus reducing the number of parts.

[0152] In the above scheme, the first sealing element 51 is disposed in the receiving groove 113 and between the connecting end 1221 and the first side wall 112, so that the connecting end 1221 and the first side wall 112 are sealed together, thereby achieving the sealing between the second side wall 122 and the first side wall 112. The first battery cell assembly 31 and the second battery cell assembly 32 share the same sealing structure, reducing the number of parts and saving manufacturing costs.

[0153] Please refer to Figure 6According to some embodiments of this application, the connecting end 1221 is provided with a second through hole 1222, the groove wall of the receiving groove 113 is provided with a second threaded hole 1131 corresponding to the second through hole 1222, and the battery device 100 further includes a second fastener 42, which passes through the second through hole 1222 and is connected to the second threaded hole 1131 to connect the connecting end 1221 to the first side wall 112.

[0154] In some embodiments, the second through hole 1222 is a hole that passes through the connecting end 1221 along the second direction Y, so that the second fastener 42 can be connected to the first sidewall 112 after passing through the connecting end 1221.

[0155] The second threaded hole 1131 can be a threaded hole opened on the groove wall of the receiving groove 113, or the second threaded hole 1131 can be a threaded hole of a threaded sleeve embedded in the groove wall of the receiving groove 113.

[0156] The second fastener 42 can be a bolt or a fastener with a threaded section. The second fastener 42 is set along the second direction Y. After the threaded section of the second fastener 42 passes through the second through hole 1222, it is threadedly engaged with the second threaded hole 1131 to improve the connection stability between the connection end 1221 and the first side wall 112.

[0157] In the above scheme, the second through hole 1222 facilitates the insertion of the second fastener 42, thereby improving assembly efficiency; the second threaded hole 1131 facilitates the assembly of the second fastener 42 with the groove wall of the receiving groove 113; the connection end 1221 and the first side wall 112 have high connection stability, which facilitates the assembly and disassembly of the connection end 1221 and the first side wall 112, and facilitates the maintenance and replacement of the first battery cell assembly 31 or the second battery cell assembly 32.

[0158] In some embodiments, there are multiple second through holes 1222, which are spaced apart along a third direction X. There are also multiple second threaded holes 1131, which are spaced apart along a third direction X, with one threaded hole corresponding to one second through hole 1222. There are also multiple second fasteners 42, which mate with one second through hole 1222 and one second threaded hole 1131. The arrangement of multiple second through holes 1222, multiple second threaded holes 1131, and multiple second fasteners 42 allows the connecting end 1221 and the first sidewall 112 to have multiple connection positions in a third manner, thereby improving the connection stability between the connecting end 1221 and the first sidewall 112.

[0159] Please refer to Figure 6According to some embodiments of this application, the second fastener 42 does not protrude from the first outer surface 112a in the direction from the first inner surface 112b to the first outer surface 112a.

[0160] When the second sidewall 122 is assembled with the corresponding first sidewall 112, the second fastener 42 does not protrude from the first outer surface 112a of the corresponding first sidewall 112 along the direction from the first inner surface 112b to the first outer surface 112a, so that the second fastener 42 does not occupy the space on the outside of the first sidewall 112.

[0161] In the above solution, the second fastener 42 does not protrude from the first outer surface 112a, which reduces the space occupied by the structure after the second fastener 42 connects the connecting end 1221 to the first side wall 112, and reduces the risk of the second fastener 42 interfering with other components.

[0162] Please refer to Figure 3 According to some embodiments of this application, a first flow channel 1111 is formed inside the bottom wall 111 for containing heat exchange medium; a second flow channel 24 is formed inside the support 20 for containing heat exchange medium.

[0163] The first flow channel 1111 is formed inside the bottom wall 111 and serves as a channel for the flow of the heat exchange medium. After the battery device 100 is assembled, the first flow channel 1111 can contain the heat exchange medium to facilitate heat exchange with the first battery cell assembly 31 through the bottom wall 111. 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 31 through the bottom wall 111, which can reduce the temperature of the first battery cell assembly 31. As another example, 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 31 through the bottom wall 111, which can increase the temperature of the first battery cell assembly 31.

[0164] In some embodiments, the bottom wall 111 may be made of a material with good thermal conductivity to facilitate heat exchange between the heat exchange medium and the first battery cell assembly 31.

[0165] The second flow channel 24 is formed inside the support 20 and serves as a channel for the flow of the heat exchange medium. After the battery device 100 is assembled, the second flow channel 24 can contain the heat exchange medium to facilitate heat exchange between the support 20 and the second battery cell assembly 32. 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 32 through the support 20, thereby reducing the temperature of the second battery cell assembly 32. 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 32 through the support 20, thereby increasing the temperature of the second battery cell assembly 32.

[0166] In some embodiments, the material of the support 20 may have good thermal conductivity so that the heat exchange medium can exchange heat with the second battery cell assembly 32 through the support 20.

[0167] Meanwhile, since the bracket 20 is located between the first battery cell assembly 31 and the second battery cell assembly 32, the bracket 20 can also regulate the temperature of the first battery cell assembly 31.

[0168] In some embodiments, the heat exchange medium is a fluid, which may be, but is not limited to, water, alcohol or other liquid mixtures.

[0169] In the above scheme, the first flow channel 1111 is set up to facilitate the placement of a heat exchange medium within the first flow channel 1111, which facilitates heat exchange with the first battery cell assembly 31 through the heat exchange medium, thereby regulating the temperature of the first battery cell assembly 31; the second flow channel 24 is set up to facilitate the placement of a heat exchange medium within the second flow channel 24, which facilitates heat exchange with the second battery cell assembly 32 through the heat exchange medium placed within the second flow channel 24, thereby regulating the temperature of the second battery cell assembly 32; at the same time, since the bracket 20 is located between the first battery cell assembly 31 and the second battery cell assembly 32, the bracket 20 can also regulate the temperature of the first battery cell assembly 31.

[0170] Please refer to Figure 3 and Figure 4 According to some embodiments of this application, a cavity 1121 is formed inside the first sidewall 112.

[0171] The first sidewall 112 can be manufactured by extrusion molding.

[0172] The interior of the first sidewall 112 may be reinforced with ribs to give the first sidewall 112 high strength.

[0173] In the above scheme, the first sidewall 112 is a hollow structure and has a lighter weight, which makes it easier to reduce the weight of the box 10 and the overall weight of the battery device 100.

[0174] Please refer to Figure 2 and further refer to Figure 7 , Figure 7This is a partial structural schematic diagram of a battery device provided in some embodiments of this application. According to some embodiments of this application, the second housing 12 has openings 123 formed at both ends along the third direction X, and the third direction X, the second direction Y, and the first direction Z are perpendicular to each other; the housing 10 also includes two third sidewalls 13 arranged opposite each other along the third direction X, and the first battery cell assembly 31 and the second battery cell assembly 32 are both disposed between the two third sidewalls 13; along the direction from the bottom wall 111 to the first battery cell assembly 31, the third sidewalls 13 protrude from the first sidewall 112, and the two third sidewalls 13 respectively close the two openings 123.

[0175] When the first direction Z is the height direction of the battery device 100 and the second direction Y is the width direction of the battery device 100, the third direction X can be the length direction of the battery device 100.

[0176] In some embodiments, the top wall 121 and the two second side walls 122 form an opening 123 at their ends in the third direction X.

[0177] The third sidewall 13 can be connected to the bottom wall 111 by welding or bonding. In some embodiments, the third sidewall 13 can be equipped with components such as explosion-proof valves, water-cooled connectors, or high and low voltage connectors to facilitate the normal charging and discharging operation of the battery device 100.

[0178] The openings 123 formed at both ends of the second housing 12 along the third direction X can be notches corresponding to the third sidewall 13, and the third sidewall 13 can correspondingly close the openings 123. In some embodiments, the cross-sectional shape of the second housing 12 can be U-shaped.

[0179] In the above scheme, by setting the third sidewall 13, on the one hand, components such as explosion-proof valves, water-cooled connectors or high and low voltage connectors can be installed on the third sidewall 13, which facilitates the normal charging and discharging operation of the battery device 100; on the other hand, by closing the opening 123 through the third sidewall 13, the space utilization rate of the battery device 100 in the third direction X can be improved, and the volumetric energy density of the battery device 100 can be improved.

[0180] Please refer to Figure 2 and Figure 7 According to some embodiments of this application, the third sidewall 13 has a second inner surface 131 facing the second battery cell assembly 32, a second outer surface 132 facing away from the second battery cell assembly 32, and a first side surface 133 connecting the second inner surface 131 and the second outer surface 132. The second housing 12 includes two connecting portions 124, which are located at both ends of the second housing 12 along the third direction X. The connecting portions 124 form an opening 123 and are connected to the first side surface 133.

[0181] The second inner surface 131 and the second outer surface 132 are disposed opposite each other along the thickness direction of the third sidewall 13, and the thickness direction of the third sidewall 13 is parallel to the third direction X. The first side surface 133 can be the outer peripheral surface of the third sidewall 13 located between the second inner surface 131 and the second outer surface 132. The outer peripheral surface of the third sidewall 13 can be the outer surface of the third sidewall 13 in the first direction Z and the second direction Y.

[0182] The connecting portion 124 is located at the end of the second housing 12 in the third direction X, which surrounds the opening 123 of the second housing 12, and the outline of the connecting portion 124 fits the first side surface 133 of the third side wall 13.

[0183] The connecting portion 124 may be in the form of a sheet, which mates with the first side surface 133. In some embodiments, the connection between the connecting portion 124 and the first side surface 133 is a surface-to-surface connection.

[0184] In the above solution, the connection part 124 is connected to the first side surface 133 of the third side wall 13, which facilitates the improvement of the connection stability and sealing between the second housing 12 and the third side wall 13.

[0185] Please refer to Figure 2 and Figure 3 According to some embodiments of this application, the third sidewall 13 may include a first portion 134 and a second portion 135 that are interconnected. The first portion 134 and the second portion 135 are distributed along a first direction Z. The first portion 134 is connected to the bottom wall 111 and the two first sidewalls 112. The bottom wall 111, the two first sidewalls 112, the first portions 134 of the two third sidewalls 13, and the support 20 form a first receiving space 10a. The second portion 135 is connected to the top wall 121 and the two second sidewalls 122. The support 20, the top wall 121, the two second sidewalls 122, and the second portions 135 of the two third sidewalls 13 form a second receiving space 10b.

[0186] Please refer to Figure 2 and Figure 7 In some embodiments, the second inner surface 131, the second outer surface 132, and the first side surface 133 can be the surface of the first part 134. The first side surface 133 includes a first flat surface 133a, a second flat surface 133b, and a transition surface 133c. The first flat surface 133a is disposed at one end of the third side wall 13 away from the bottom wall 111. The two second flat surfaces 133b are respectively disposed at both ends of the third side wall 13 along the second direction Y. The transition surface 133c connects the first flat surface 133a and the second flat surface 133b so that the first flat surface 133a and the second flat surface 133b transition smoothly.

[0187] The first flat surface 133a can be the upper surface of the third sidewall 13, and it can be a flat surface. The second flat surface 133b can be the outer surface of the third sidewall 13, and it can be a flat surface. In some embodiments, the first flat surface 133a and the second flat surface 133b are perpendicular to each other. The transition surface 133c is the portion connecting the first flat surface 133a and the second flat surface 133b, which enables a smooth transition between the first flat surface 133a and the second flat surface 133b. A smooth transition means that the first flat surface 133a and the second flat surface 133b are in a non-right-angle transition relationship.

[0188] In some embodiments, the transition surface 133c can be an arc surface or an inclined surface.

[0189] The first flat surface 133a and the second flat surface 133b are non-coplanar surfaces. Therefore, by providing a transition surface 133c, the first flat surface 133a and the second flat surface 133b can be smoothly transitioned, which can facilitate the formation of a good sealing surface between the connecting part 124 and the first side surface 133, thereby improving the sealing performance of the battery device 100.

[0190] In some embodiments, the first part 134 and the second part 135 can be separate structures, facilitating the assembly of the first housing 11 and the second housing 12 with the third sidewall 13, respectively. In another embodiment, the first part 134 and the second part 135 are integrally formed, facilitating processing and manufacturing.

[0191] Please refer to Figure 7 and further refer to Figure 8 , Figure 8 This is a schematic diagram illustrating the assembly of the connecting portion and the third sidewall according to some embodiments of this application. According to some embodiments of this application, the connecting portion 124 is provided with a third through hole 1241, the first sidewall 133 is provided with a third threaded hole 1331, and the battery device 100 further includes a third fastener 43, which passes through the third through hole 1241 and connects to the third threaded hole 1331 to connect the connecting portion 124 to the third sidewall 13.

[0192] The third through hole 1241 is a hole that passes through the connecting part 124 along the first direction Z, so that the third fastener 43 can be connected to the third side wall 13 after passing through the connecting part 124.

[0193] The third threaded hole 1331 can be a threaded hole opened on the first side 133, or the third threaded hole 1331 can be a threaded hole of a threaded sleeve embedded in the first side 133.

[0194] The third fastener 43 can be a bolt or a fastener with a threaded section. The third fastener 43 is set along the first direction Z. After the threaded section of the third fastener 43 passes through the third through hole 1241, it is threadedly engaged with the third threaded hole 1331 to improve the connection stability between the connecting part 124 and the third side wall 13.

[0195] In the above scheme, the setting of the third through hole 1241 facilitates the insertion of the third fastener 43 and improves assembly efficiency; the setting of the third threaded hole 1331 facilitates the assembly of the third fastener 43 and the first side 133; the connection between the connecting part 124 and the third side wall 13 has high connection stability, which is conducive to the assembly and disassembly of the connecting part 124 and the third side wall 13.

[0196] In some embodiments, there are multiple third threaded holes 1331, which are spaced apart circumferentially along the third sidewall 13. There are also multiple third through holes 1241, with one third threaded hole 1331 corresponding to one third through hole 1241. There are also multiple third fasteners 43, each engaging with one third through hole 1241 and one third threaded hole 1331. The arrangement of multiple third through holes 1241, multiple third threaded holes 1331, and multiple third fasteners 43 improves the connection stability between the connecting portion 124 and the third sidewall 13.

[0197] Please refer to Figure 7 and Figure 8 According to some embodiments of this application, the battery device 100 further includes a second seal 52 disposed between the connecting portion 124 and the first side surface 133.

[0198] The second seal 52 can be a component with sealing properties and disposed between the connecting portion 124 and the first side surface 133. In some embodiments, the second seal 52 can be a sealant or a gasket, and the second seal 52 is sandwiched between the first side surface 133 and the connecting portion 124. For example, the second seal 52 is sandwiched between the first flat surface 133a and the connecting portion 124, between the second flat surface 133b and the connecting portion 124, and between the transition surface 133c and the connecting portion 124.

[0199] In the above solution, by providing a second sealing member 52 between the connecting part 124 and the first side surface 133, the sealing performance between the connecting part 124 and the first side surface 133 can be improved, thereby improving the sealing performance of the battery device 100.

[0200] In some embodiments, the first seal 51 and the second seal 52 can be independent structures, and the first seal 51 and the second seal 52 can be connected by adhesive or intermediate connector.

[0201] In some embodiments, the first seal 51 and the second seal 52 may be an integral structure. For example, the first seal 51 and the second seal 52 may be integrally formed.

[0202] According to some embodiments of this application, this application also provides an electrical device, which includes a battery device 100 provided according to any of the above embodiments, the battery device 100 being used to provide electrical energy.

[0203] The power supply device can be any of the above-mentioned devices or systems that use the battery device 100 as a power source.

[0204] According to some embodiments of this application, please refer to Figures 2 to 8 This application provides a battery device 100, which includes a housing 10, a bracket 20, a first battery cell assembly 31, a second battery cell assembly 32, a first fastener 41, a second fastener 42, and a first seal 51.

[0205] The housing 10 includes a first housing 11 and a second housing 12, which are arranged opposite to each other along a first direction Z and are fastened together.

[0206] The first housing 11 includes a bottom wall 111 and two first side walls 112 disposed opposite to each other along a second direction Y. The bottom wall 111 supports a first battery cell assembly 31 and connects the two first side walls 112. The first side wall 112 has a first outer surface 112a and a first inner surface 112b opposite to each other along its thickness direction, and a first end face 112c facing away from the bottom wall 111. The first end face 112c is located between the first outer surface 112a and the first inner surface 112b. The first outer surface 112a is provided with a receiving groove 113. Along the first direction Z, the receiving groove 113 extends to the first end face 112c. Along the third direction X, the receiving groove 113 passes through both ends of the first side wall 112.

[0207] A bracket 20 is disposed within a housing 10. A first housing 11 and the bracket 20 form a first accommodating space 10a, and a second housing 12 and the bracket 20 form a second accommodating space 10b. A first battery cell assembly 31 is disposed in the first accommodating space 10a, and a second battery cell assembly 32 is disposed in the second accommodating space 10b. Along the second direction Y, the distance between the first battery cell assembly 31 and the first inner surface 112b is W, which satisfies W ≤ 8mm.

[0208] The bracket 20 is located on the side of the first sidewall 112 opposite to the bottom wall 111. The bracket 20 is connected to the first end face 112c and supports the second battery cell assembly 32. The bracket 20 is provided with a first through hole 21, and the first end face 112c is provided with a first threaded hole 112d corresponding to the first through hole 21. The first fastener 41 passes through the first through hole 21 and is connected to the first threaded hole 112d to connect the bracket 20 to the first sidewall 112.

[0209] The second housing 12 includes a top wall 121 and two second side walls 122. The top wall 121 and the bottom wall 111 are arranged opposite each other along a first direction Z, and the two second side walls 122 are spaced apart along a second direction Y. The top wall 121 connects the two second side walls 122. The second side wall 122 has a connecting end 1221 away from the top wall 121. The connecting end 1221 is disposed in a receiving groove 113. A first sealing member 51 is disposed in the receiving groove 113 along the second direction Y, between the connecting end 1221 and the first side wall 112. The connecting end 1221 is provided with a second through hole 1222. The groove wall of the receiving groove 113 is provided with a second threaded hole 1131 corresponding to the second through hole 1222. The battery device 100 also includes a second fastener 42, which passes through the second through hole 1222 and is connected to the second threaded hole 1131 to connect the connecting end 1221 to the first side wall 112.

[0210] According to the battery device 100 of this application embodiment, the bracket 20 is located on the side of the first side wall 112 away from the bottom wall 111. The bracket 20 is connected to the first end face 112c. The first inner surface 112b of the first side wall 112 does not need to be provided with a structure for connecting with the bracket 20. The first battery cell assembly 31 can be set close to the first inner surface 112b, so that the distance between the first battery cell assembly 31 and the first inner surface 112b of the first side wall 112 can be small. For example, along the second direction Y, the distance between the first battery cell assembly 31 and the first inner surface 112b is W≤8mm. More first battery cell assemblies 31 can be set in the housing 10 to improve the space utilization between the two first side walls 112, thereby improving the volumetric energy density of the battery device 100. After the first fastener 41 passes through the first through hole 21 and connects to the first threaded hole 112d, it facilitates the assembly of the first fastener 41 with the first end face 112c. The bracket 20 and the first side wall 112 have high connection stability, which is conducive to the assembly and disassembly of the bracket 20 and the first side wall 112, and facilitates the maintenance and replacement of the first battery cell assembly 31 or the second battery cell assembly 32. After the inner surface of the connecting end 1221 and the groove wall of the receiving groove 113 are sealed in the second direction Y by the first sealing member 51, the seal between the second housing 12 and the first housing 11 can be achieved by the first sealing member 51 alone, without the need for additional sealing members, reducing the number of parts and saving manufacturing costs. After the second fastener 42 passes through the second through hole 1222, it connects to the second threaded hole 1131, which facilitates the assembly of the second fastener 42 with the groove wall of the receiving groove 113. The connection end 1221 and the first side wall 112 have high connection stability, which is conducive to the assembly and disassembly of the connection end 1221 and the first side wall 112, and facilitates the maintenance and replacement of the first battery cell assembly 31 or the second battery cell assembly 32.

[0211] 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 enclosure includes a first enclosure and a second enclosure, the first enclosure and the second enclosure are disposed opposite to each other along a first direction, and the first enclosure and the second enclosure are fastened together; A support frame is disposed inside the box, the first box and the support frame forming a first accommodating space, and the second box and the support frame forming a second accommodating space; A first battery cell assembly and a second battery cell assembly, wherein the first battery cell assembly is disposed in the first accommodating space and the second battery cell assembly is disposed in the second accommodating space; The first housing includes a bottom wall and two first side walls disposed opposite each other along a second direction. The bottom wall supports the first battery cell assembly. The bottom wall connects the two first side walls. The first side wall has a first outer surface and a first inner surface opposite each other along its thickness direction, and a first end face away from the bottom wall. The first end face is located between the first outer surface and the first inner surface. The bracket is connected to the first end face and supports the second battery cell assembly. The second direction is perpendicular to the first direction.

2. The battery device according to claim 1, characterized in that, The bracket is provided with a first through hole, and the first end face is provided with a first threaded hole corresponding to the first through hole. The battery device also includes a first fastener, which passes through the first through hole and is connected to the first threaded hole to connect the bracket to the first side wall.

3. The battery device according to claim 2, characterized in that, The second battery cell assembly is bonded to the bracket with an adhesive.

4. The battery device according to claim 3, characterized in that, The bracket includes a bracket body and a protrusion. The bracket body supports the second battery cell assembly. The bracket body has a first surface facing away from the bottom wall. The protrusion protrudes from the first surface and is located between the first through hole and the second battery cell assembly along the second direction.

5. The battery device according to any one of claims 1-4, characterized in that, Along the second direction, the distance between the first battery cell assembly and the first inner surface is W, which satisfies W≤8mm.

6. The battery device according to any one of claims 1-5, characterized in that, The first outer surface is provided with a receiving groove, which extends to the first end face along the first direction; The second housing includes a top wall and two second side walls. The top wall and the bottom wall are arranged opposite to each other along the first direction, and the two second side walls are spaced apart along the second direction. The top wall connects the two second side walls. The second sidewall has a connecting end away from the top wall, the connecting end being disposed within the receiving groove, and the connecting end being connected to the first sidewall.

7. The battery device according to claim 6, characterized in that, The thickness of the connecting end is less than the thickness of the first sidewall.

8. The battery device according to claim 7, characterized in that, Along the direction from the first inner surface to the first outer surface, the connecting end does not protrude from the first outer surface.

9. The battery device according to any one of claims 6-8, characterized in that, The battery device further includes a first seal, which is disposed within the receiving groove along the second direction, between the connecting end and the first sidewall.

10. The battery device according to claim 9, characterized in that, The connecting end is provided with a second through hole, and the groove wall of the receiving groove is provided with a second threaded hole corresponding to the second through hole. The battery device also includes a second fastener, which passes through the second through hole and is connected to the second threaded hole to connect the connecting end to the first side wall.

11. The battery device according to claim 10, characterized in that, Along the direction from the first inner surface to the first outer surface, the second fastener does not protrude from the first outer surface.

12. The battery device according to any one of claims 1-11, characterized in that, The bottom wall has a first flow channel formed inside, which is used to contain the heat exchange medium. The support has a second flow channel inside, which is used to contain the heat exchange medium.

13. The battery device according to any one of claims 1-12, characterized in that, A cavity is formed inside the first sidewall.

14. The battery device according to any one of claims 1-13, characterized in that, The second housing has openings at both ends along a third direction, and the third direction, the second direction, and the first direction are perpendicular to each other. The housing also includes two third sidewalls arranged opposite each other along the third direction, and the first battery cell assembly and the second battery cell assembly are both disposed between the two third sidewalls; Along the direction of the bottom wall toward the first battery cell assembly, the third sidewall protrudes from the first sidewall, and the two third sidewalls respectively close the two openings.

15. The battery device according to claim 14, characterized in that, The third sidewall has a second inner surface facing the second battery cell assembly, a second outer surface facing away from the second battery cell assembly, and a first side surface connecting the second inner surface and the second outer surface. The second housing includes two connecting portions, which are respectively located at both ends of the second housing along the third direction. The connecting portions form the opening and are connected to the first side surface.

16. The battery device according to claim 15, characterized in that, The connecting part is provided with a third through hole, and the first side is provided with a third threaded hole. The battery device also includes a third fastener, which passes through the third through hole and is connected to the third threaded hole to connect the connecting part to the third side wall.

17. The battery device according to claim 15 or 16, characterized in that, The battery device further includes a second seal disposed between the connecting portion and the first side.

18. An electrical appliance, characterized in that, Includes a battery device as described in any one of claims 1-17, the battery device being used to provide electrical energy.

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