Battery device and electric device

Abstract

The embodiment of the utility model provides a battery device and a power utilization device. The battery device comprises a 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] The present application relates to the technical field of battery devices, and in particular to a battery device and an electrical device. Background Art

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

[0003] During the manufacturing process of battery devices, the energy density of the battery device is an issue that cannot be ignored. Therefore, how to improve the energy density of the battery device is a technical problem that needs to be solved urgently in battery technology. Utility Model Content

[0004] The present application provides a battery device and an electrical device, which can improve the energy density of the battery device.

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

[0006] In a first aspect, an embodiment of the present application provides 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, the first housing and the second housing being arranged opposite to each other along a first direction, and the first housing and the second housing being snapped together; the bracket is arranged in the housing, the first housing and the bracket forming a first accommodating space, and the second housing and the bracket forming a second accommodating space; 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 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, the bottom wall connects the two first side walls, the 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 being located between the first outer surface and the first inner surface, the bracket is connected to the first end face, the bracket supports the second battery cell assembly, and the second direction is perpendicular to the first direction.

[0007] According to the battery device of an embodiment of the present application, a first housing and a second housing are arranged opposite each other along a first direction, a bracket is arranged within the housing and divides the interior of the housing into a first storage space and a second storage space, a first battery cell assembly is accommodated in the first storage space, and a second battery cell assembly is accommodated in the second storage space, so that the first battery cell assembly and the second battery cell assembly are stacked in the first direction. In the first direction, the bracket is arranged on a side of the first side wall facing away from the bottom wall, and the bracket can be located above the first side wall. The bracket is connected to a first end surface of the first side wall facing away from the bottom wall. No structure for connecting to the bracket is required on the first inner surface of the first side wall. The first battery cell assembly can be arranged close to the first inner surface, so that the distance between the first battery cell assembly and the first inner surface of the first side wall can be reduced. More first battery cell assemblies can be arranged within the housing, so as to improve the space utilization between the two first side walls, thereby improving the volumetric energy density of the battery device.

[0008] According to some embodiments of the present application, the bracket is provided with a first through hole, the first end surface is provided with a first threaded hole corresponding to the first through hole, and the battery device also includes a first fastener, the first fastener 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 setting of the first through hole facilitates the insertion of the first fastener, thereby improving assembly efficiency; the setting of 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 a 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 the present application, the second battery cell assembly is bonded to the bracket by colloid.

[0011] In the above solution, the second battery cell assembly is bonded to the bracket by colloid, which is simple in process and easy to operate.

[0012] According to some embodiments of the present application, 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 is protruded from the first surface, and along the second direction, the protrusion is located between the first through hole and the second battery cell assembly.

[0013] In the above solution, the protrusion is protruding from the first surface, which can form a barrier between the first mounting hole and the second monomer component, reducing the risk of the colloid flowing into the first through hole and affecting the assembly of the first fastener and the first through hole.

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

[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, and more first battery cell assemblies can be arranged to improve the space utilization between the two first side walls, which is conducive to improving the volume energy density of the battery device.

[0016] According to some embodiments of the present application, a receiving groove is provided on the first outer surface, and the receiving groove extends to the first end surface along the first direction; the second box body 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 arranged at intervals 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 arranged in the receiving groove, and the connecting end is connected to the first side wall.

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

[0018] According to some embodiments of the present application, the thickness of the connecting end is smaller than the thickness of the first side wall.

[0019] In the above solution, the first side wall has a relatively large thickness, so that the first side wall still has a relatively high strength after being provided with the accommodating groove, thereby achieving a relatively high connection reliability between the connecting end and the first side wall.

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

[0021] In the above solution, the connecting end does not protrude from the first outer surface, so that the structure after the connecting end is connected to the first side wall occupies a smaller assembly space, reducing the risk of interference between the connecting end and other components.

[0022] According to some embodiments of the present application, the battery device further includes a first seal, which is disposed in the receiving groove. Along the second direction, the first seal is disposed between the connecting end and the first side wall.

[0023] In the above scheme, the first seal is arranged in the accommodating groove, and the first seal is arranged between the connecting end and the first side wall, so that the connecting end and the first side wall are sealed and matched to achieve the seal 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 parts and saving manufacturing costs.

[0024] According to some embodiments of the present application, the connecting end is provided with a second through hole, the groove wall of the accommodating groove is provided with a second threaded hole corresponding to the second through hole, and 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.

[0025] In the above scheme, the provision of the second through hole facilitates the insertion of the second fastener, thereby improving assembly efficiency; the provision of the second threaded hole facilitates the assembly of the second fastener with the groove wall of the accommodating groove, and the connection end and the first side wall have a higher 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 the present application, along a direction from the first inner surface to the first outer surface, the second fastener does not protrude from the first outer surface.

[0027] In the above solution, the second fastener does not protrude from the first outer surface, thereby 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 the present application, a first flow channel is formed inside the bottom wall, and the first flow channel is used to accommodate a heat exchange medium; a second flow channel is formed inside the bracket, and the second flow channel is used to accommodate a heat exchange medium.

[0029] In the above scheme, the first flow channel is set so that a heat exchange medium can be set in the first flow channel, so that heat exchange between the heat exchange medium and the first battery cell assembly can be carried out to adjust the temperature of the first battery cell assembly; the second flow channel is set so that a heat exchange medium can be set in the second flow channel, so that heat exchange between the heat exchange medium set in the second flow channel and the second battery cell assembly can be carried out to adjust the temperature of the second battery cell assembly; at the same time, since the bracket is located between the first battery cell assembly and the second battery cell assembly, the bracket can also adjust the temperature of the first battery cell assembly.

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

[0031] In the above solution, the first side wall is a hollow structure and has a light weight, which is convenient for reducing the weight of the box body and the overall weight of the battery device.

[0032] According to some embodiments of the present application, openings are respectively formed at both ends of the second box body along the third direction, and the third direction, the second direction and the first direction are perpendicular to each other; the box body also includes two third side walls arranged opposite to each other along the third direction, and the first battery cell assembly and the second battery cell assembly are both arranged between the two third side walls; along the direction of the bottom wall pointing to the first battery cell assembly, the third side wall protrudes from the first side wall, and the two third side walls respectively close the two openings.

[0033] In the above solution, by providing a third side wall, 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 side wall to facilitate normal charging and discharging of the battery device; on the other hand, by closing the opening through the third side wall, the space utilization of the battery device in the third direction can be improved, thereby increasing the volume energy density of the battery device.

[0034] According to some embodiments of the present application, the third side wall 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 box body includes two connecting parts, which are respectively located at both ends of the second box body along the third direction. The connecting parts surround an opening, and the connecting parts are connected to the first side surface.

[0035] In the above solution, the connection portion is connected to the first side surface of the third side wall, so as to improve the connection stability and sealing performance between the second box body and the third side wall.

[0036] According to some embodiments of the present application, the connecting portion 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 portion to the third side wall.

[0037] In the above scheme, the setting of the third through hole facilitates the insertion of the third fastener, thereby improving assembly efficiency; the setting of the third threaded hole facilitates the assembly of the third fastener with the first side surface, and the connection between the connecting part and the third side wall has a higher 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 the present application, the battery device further includes a second sealing member disposed between the connecting portion and the first side surface.

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

[0040] In a second aspect, an embodiment of the present application further provides an electrical device, which includes a battery device provided according to any of the above embodiments, and the battery device is used to provide electrical energy.

[0041] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0043] Figure 1 A schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0044] Figure 2 A schematic diagram of the structural decomposition of a battery device provided in some embodiments of the present application;

[0045] Figure 3 A cross-sectional view of a battery device provided in some embodiments of the present application;

[0046] Figure 4 for Figure 3 A local enlarged view of point A;

[0047] Figure 5 for Figure 4 A partial enlarged view of point B;

[0048] Figure 6 A cross-sectional view of a portion of the structure of a battery device provided in some embodiments of the present application;

[0049] Figure 7 A schematic diagram of a portion of the structure of a battery device provided in some embodiments of the present application;

[0050] Figure 8 Schematic diagram of the assembly of the connecting portion and the third side wall provided in some embodiments of the present application.

[0051] Icons: 100-battery device; 10-housing; 10a-first storage space; 10b-second storage 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-slot; 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 portion; 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 DESCRIPTION

[0052] The following detailed description of the embodiments of the present application is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0053] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

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

[0055] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0056] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0057] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0058] The term "multiple" in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0059] The battery device mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, parallel, or hybrid via a busbar.

[0060] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells. For example, the battery cell assembly may be a battery module, which is formed by arranging and securing multiple battery cells to form a single module. For example, a battery module may be formed by bundling multiple battery cells using cable ties.

[0061] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are housed in the case.

[0062] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0063] As an example, the battery cell assembly may also be housed in the box by directly fixing the plurality of battery cells to the box.

[0064] As an example, the housing may include a first housing and a second housing. The first housing and the second housing engage to form an enclosed space within the housing to house the battery cell assembly. Enclosed here means covered or closed, and can be either sealed or unsealed. The first housing may be a top cover or a bottom plate.

[0065] As an example, the box may include a top cover, a frame, and a bottom plate, wherein the top cover and the bottom plate are respectively connected to the frame to form a closed space inside the box to accommodate the battery cell assembly.

[0066] As an example, the box body can be used as a part of the chassis structure of the vehicle. For example, the top cover of the box body can become at least a part of the floor of the vehicle, or the frame of the box body can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0067] In some embodiments, the battery device refers to an energy storage device, which includes a box with a door on at least one side. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0068] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0069] The battery cells may be, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, and the like.

[0070] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator, placed between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing the 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 electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0073] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium with a silver-plated surface may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may 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-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present 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 may be a metal foil or a composite current collector. For example, the metal foil may be silver-plated aluminum, silver-plated stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium.

[0077] In some embodiments, the negative electrode current collector has two opposite surfaces in its 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 for a battery that is well known in the art. 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, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional 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. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical and mechanical stability can be selected.

[0080] As an example, the primary 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 positioned 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, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0082] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0083] In some embodiments, the electrode assembly is a laminate structure.

[0084] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film.

[0085] In some embodiments, the housing includes an end cap and a shell. The shell has an opening, and the end cap closes the opening to form a sealed space for accommodating the electrode assembly, electrolyte, and other substances. The shell may have one or more openings. One or more end caps may also be provided.

[0086] In some embodiments, the housing is provided with at least one electrode terminal, which is electrically connected to a tab of the electrode assembly. The electrode terminal may be directly connected to the tab or indirectly connected to the tab via an adapter. The electrode terminal may be provided on an end cap or on the housing.

[0087] In some embodiments, the housing is provided with an explosion-proof valve for releasing the internal pressure of the battery cell.

[0088] In some embodiments, the housing can be a sealed structure or a non-sealed structure. For example, when the housing is a sealed structure, the housing can protect the electrode assembly and prevent leakage of electrolyte. When the housing is a non-sealed structure, the housing can also protect the electrode assembly. A sealing bag can 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 member or an aluminum-plastic film.

[0089] As an example, the battery cells may be cylindrical, prismatic, soft-pack or other shaped battery cells. Prismatic battery cells include square-shell, blade-shaped, and polygonal batteries. Polygonal batteries may be, for example, hexagonal batteries.

[0090] The development of battery technology requires simultaneous consideration of multiple design factors, including performance parameters such as reliability, discharge capacity, and charge / discharge rate. Furthermore, the energy density of the battery device must be considered. The energy density of a battery device includes both volumetric 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 box body that accommodates the lower battery cell assemblies, and the bracket that supports the upper battery cell assemblies is connected to the boss, so that the space below the boss inside the lower box body cannot be used to place the battery cell assemblies, resulting in space waste, low utilization of the space inside the box body, and low volume energy density of the battery device.

[0092] In view of this, to address the problem of low space utilization within a housing, which results in a low volumetric energy density of a battery device, an embodiment of the present application provides a battery device comprising a housing, a bracket, a first battery cell assembly, and a second battery cell assembly. The housing comprises a first housing and a second housing, the first housing and the second housing being arranged opposite each other along a first direction and interlocked with each other. The bracket is disposed within the housing, the first housing and the bracket forming a first accommodating space, and the second housing and the bracket forming a second accommodating space. The first battery cell assembly is disposed within the first accommodating space, and the second battery cell assembly is disposed within the second accommodating space. The first housing comprises 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 and the bottom wall connects the two first side walls. The first side wall has a first outer surface and a first inner surface opposing each other along its thickness, and a first end surface facing away from the bottom wall. The first end surface is located between the first outer surface and the first inner surface. The bracket is connected to the first end surface and supports the second battery cell assembly. The second direction is perpendicular to the first direction. This battery device has high internal space utilization within the housing and a high volumetric energy density.

[0093] In such a battery device, a first housing and a second housing are disposed opposite each other in a first direction. The first housing can serve as a lower housing, and the second housing can serve as an upper housing. A bracket is disposed within the housing and divides the interior of the housing into a first storage space and a second storage space. The first battery cell assembly is accommodated in the first storage space, and the second battery cell assembly is accommodated in the second storage space, so that the first battery cell assembly and the second battery cell assembly are stacked in the first direction. The bracket is disposed on a side of the first side wall facing away from the bottom wall along the first direction. The bracket can be located above the first side wall and connected to a first end surface of the first side wall facing away from the bottom wall. A structure for connecting with the bracket is not required on the first inner surface of the first side wall. The first battery cell assembly can be disposed close to the first inner surface, thereby reducing the distance between the first battery cell assembly and the first inner surface of the first side wall. A larger number of first battery cell assemblies can be disposed within the housing, thereby improving the space utilization between the two first side walls and thereby increasing the volumetric energy density of the battery device.

[0094] The battery device disclosed in the embodiments of the present application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. The battery device disclosed in the present application can be used to form a power supply system for the electrical device.

[0095] The technical solutions described in the embodiments of the present application are applicable to various electrical devices that use battery devices, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0096] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device according to an embodiment of the present application.

[0097] Please refer to Figure 1 , Figure 1 Schematic diagram of the structure of the vehicle provided for some embodiments of the present application. Vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000. The battery device 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000. For example, the battery device 100 can be used as an operating power source for the vehicle 1000 and for the circuit system of the vehicle 1000, such as for the working power requirements during the startup, navigation and operation of the vehicle 1000.

[0098] The vehicle 1000 may further 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, to meet the power requirements of the vehicle 1000 during startup, navigation, and driving.

[0099] In some embodiments of the present application, the battery device 100 can serve not only as an operating power source for the vehicle 1000 , but also as a 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 a schematic diagram of the structural decomposition of the battery device provided in some embodiments of the present application. Figure 3 A cross-sectional view of a battery device provided in some embodiments of the present application, Figure 4 for Figure 3 A partial enlarged view of point A, Figure 5 for Figure 4 An enlarged partial view of point B. This embodiment of the present application provides a battery device 100, comprising a housing 10, a bracket 20, a first battery cell assembly 31, and a second battery cell assembly 32. The housing 10 comprises a first housing 11 and a second housing 12, which are arranged relative to each other along a first direction Z and are engaged with each other. The bracket 20 is disposed within the housing 10, with the first housing 11 and the bracket 20 forming a first accommodating space 10a, and the second housing 12 and the bracket 20 forming a second accommodating space 10b. The first battery cell assembly 31 is disposed in the first accommodating space 10a, and the second battery cell assembly 32 is disposed in the second accommodating space 10b. Among them, the first box body 11 includes a bottom wall 111 and two first side walls 112 arranged oppositely along the second direction Y. The bottom wall 111 supports the first battery monomer assembly 31. The bottom wall 111 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 bracket 20 is connected to the first end face 112c. The bracket 20 supports the second battery monomer assembly 32. The second direction Y is perpendicular to the first direction Z.

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

[0102] The box body 10 is used to provide a storage space for the first battery cell assembly 31 and the second battery cell assembly 32 .

[0103] The first housing 11 and the second housing 12 are disposed opposite each other along a first direction Z, and the first housing 11 and the second housing 12 are engaged with each other so that the first housing 11 and the second housing 12 enclose a space for accommodating the first battery cell assembly 31 and the second battery cell assembly 32. In some embodiments, the first direction Z may be a vertical direction, the first housing 11 may be a lower housing, and the second housing 12 may be an upper housing.

[0104] The first battery cell assembly 31 may include a plurality of first battery cells, which may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the plurality of first battery cells. The first battery cell assembly 31 may also include other structures, such as a first busbar assembly for electrically connecting the plurality of first battery cells.

[0105] The second battery cell assembly 32 may include a plurality of second battery cells, which may be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a configuration in which the plurality of second battery cells are connected both in series and in parallel. The second battery cell assembly 32 may also include other structures, such as a second busbar assembly for electrically connecting the plurality of second battery cells.

[0106] The bracket 20 is a component for supporting the second battery cell assembly 32 . The bracket 20 has a certain strength and can be made of metal, such as aluminum alloy, stainless steel, etc.; the bracket 20 can also be made of hard non-metal such as engineering plastics.

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

[0108] The first inner surface 112b is the surface of the first sidewall 112 that encloses the first accommodation space 10a. 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 accommodation space 10a. The first outer surface 112a faces away from the first battery cell assembly 31. The first end surface 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 surface 112c connects the first inner surface 112b and the first outer surface 112a. Alternatively, one end of the first end surface 112c in the second direction Y may be connected to the first inner surface 112b, and the other end of the first end surface 112c in the second direction Y may define a groove between the first outer surface 112a and the first end surface 112a.

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

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

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

[0112] According to the battery device 100 of an embodiment of the present application, the first box body 11 and the second box body 12 are arranged opposite to each other along the first direction Z, the bracket 20 is arranged in the box body 10 and divides the interior of the box body 10 into a first accommodating space 10a and a second accommodating space 10b, the first battery cell assembly 31 is accommodated in the first accommodating space 10a, and the 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 are stacked in the first direction Z. Among them, along the first direction Z, the bracket 20 is arranged on the side of the first side wall 112 away from the bottom wall 111, the bracket 20 can be located above the first side wall 112, and the bracket 20 is connected to the first end surface 112c of the first side wall 112 away from the bottom wall 111. There is no need to set a structure for connecting with the bracket 20 on the first inner surface 112b of the first side wall 112. The first battery cell assembly 31 can be arranged 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 arranged in the box body 10 to improve the space utilization between the two first side walls 112, thereby improving the volume energy density of the battery device 100.

[0113] Please refer to Figure 4 and Figure 5 According to some embodiments of the present application, the bracket 20 is provided with a first through hole 21, and the first end surface 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 may 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 passes through the bracket 20 and is connected to the first side wall 112 .

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

[0116] The first fastener 41 can be a bolt or a fastener with a threaded section. The first fastener 41 is arranged along the first direction Z. After one end of the threaded section of the first fastener 41 passes through the first through hole 21, it is threadedly engaged 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 setting of the first through hole 21 facilitates the insertion of the first fastener 41, thereby improving assembly efficiency; the setting of the first threaded hole 112d facilitates the assembly of the first fastener 41 with the first end face 112c, and the bracket 20 and the first side wall 112 have a 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, and the multiple first through holes 21 are spaced apart along the third direction X, with the third direction X, the second direction Y, and the first direction Z being perpendicular to each other. There are multiple first threaded holes 112d, and the multiple first threaded holes 112d are spaced apart along the third direction X, with one first threaded hole 112d corresponding to one first through hole 21. There are multiple first fasteners 41, and one first fastener 41 cooperates with one first through hole 21 and one first threaded hole 112d. The provision of multiple first through holes 21, multiple first threaded holes 112d, and multiple first fasteners 41 allows the bracket 20 to have multiple connection locations with the first side wall 112 in the third manner, thereby improving the stability of the connection between the bracket 20 and the first side wall 112.

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

[0120] For example, when assembling the second battery cell assembly 32 with the bracket 20, colloid may be provided on the surface of the bracket 20 facing away from the bottom wall 111, and the second battery cell and the bracket 20 may be bonded together by the colloid, thereby achieving assembly of the second battery cell assembly 32 with the bracket 20. For another example, when assembling the second battery cell assembly 32 with the bracket 20, colloid may be provided on the surface of the second battery cell assembly 32 facing the bracket 20, and the second battery cell and the bracket 20 may be bonded together by the colloid, thereby achieving assembly of the second battery cell assembly 32 with the bracket 20.

[0121] In the above solution, the second battery cell assembly 32 and the bracket 20 are bonded together by colloid, which is simple in process and easy to operate.

[0122] Please refer to Figure 5 According to some embodiments of the present application, the bracket 20 includes a bracket body 22 and a protrusion 23. The bracket body 22 carries the second battery monomer assembly 32. The bracket body 22 has a portion facing away from the bottom wall 111 (see Figure 3 ), the protrusion 23 is protruded from the first surface 22a, and along the second direction Y, the protrusion 23 is located between the first through hole 21 and the second battery monomer assembly 32.

[0123] The support body 22 may be in the shape of a rectangular parallelepiped, and the support body 22 is used to support the second battery cell assembly 32 .

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

[0125] The protrusion 23 protrudes from the first surface 22 a in a direction away from the bottom wall 111 . The protrusion 23 has a certain height in the first direction Z so as to prevent 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 in a one-to-one correspondence with the two first side walls 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 side wall 112 and the orthographic projection of the second battery cell group.

[0127] In the above solution, the protrusion 23 is protruding from the first surface 22 a to form a barrier between the first mounting hole and the second monomer component, thereby reducing the risk of the colloid flowing into the first through hole 21 and affecting the assembly of the first fastener 41 and the first through hole 21 .

[0128] Please refer to Figure 3According to some embodiments of the present application, along the second direction Y, the distance between the first battery cell assembly 31 and the first inner surface 112b is W, satisfying 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 112 b in the second direction Y.

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

[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, and more first battery cell assemblies 31 can be arranged to improve the space utilization between the two first side walls 112, which is beneficial to improve the volume energy density of the battery device 100.

[0132] Please refer to Figures 3 to 5 According to some embodiments of the present application, the first outer surface 112a is provided with a receiving groove 113, and the receiving groove 113 extends to the first end surface 112c along the first direction Z; the second box body 12 includes a top wall 121 and two second side walls 122, the top wall 121 and the bottom wall 111 are arranged opposite to each other along the first direction Z, and the two second side walls 122 are arranged at intervals 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 arranged 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 112 a and extends along the first direction Z to the first end surface 112 c so that the connecting end 1221 can extend into the receiving groove 113 along the first direction Z.

[0134] In some embodiments, the first side wall 112 has a second end face and a third end face that are oppositely arranged along the third direction X. The second end face and the third end face are located at opposite ends of the first side wall 112 in the third direction. The second end face connects the first inner surface 112b and the first outer surface 112a. 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 accommodating groove 113 can extend from the second end face to the third end face to facilitate the assembly of the second box body 12 and the first side wall 112.

[0135] The top wall 121 and the bottom wall 111 can be located at opposite ends of the box body 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 bracket 20 form a second accommodating space 10 b .

[0137] In some embodiments, the connection end 1221 is disposed in the receiving groove 113 , and the connection end 1221 is connected to the groove wall of the receiving groove 113 in the second direction Y. For example, the connection 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 arranged in the receiving groove 113 and is connected to the first side wall 112 through the connecting end 1221 to facilitate the assembly of the second box body 12 and the first box body 11. For example, when the second box body 12 is assembled with the first box body 11, the connecting end 1221 of the second box body 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 the present application, the material of the first box body can be aluminum, aluminum alloy, steel, stainless steel, etc.; the material of the second box body can be plastic, aluminum, steel, stainless steel, etc.

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

[0141] Optionally, the second box is made of plastic.

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

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

[0144] In the above solution, the thickness of the connecting end 1221 is less than the thickness of the first side wall 112, and the first side wall 112 has a larger thickness, so that the first side wall 112 still has higher strength after being provided with the accommodating groove 113, so that the connection reliability between the connecting end 1221 and the first side wall 112 is higher.

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

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

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

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

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

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

[0151] The phrase "along the second direction Y, the first sealing member 51 is disposed between the connection end 1221 and the first side wall 112" means that the inner surface of the connection end 1221 is sealedly engaged with the wall of the receiving groove 113 in the second direction Y. The inner surface of the connection end 1221 may be the surface of the connection end 1221 facing the interior of the housing 10. With respect to the sealed engagement between the bracket 20 and the first side wall 112, and the sealed engagement between the second side wall 122 and the first side wall 112, after the inner surface of the connection end 1221 and the wall of the receiving groove 113 are sealedly engaged in the second direction Y by the first sealing member 51, the sealing between the second housing 12 and the first housing 11 can be achieved solely by the first sealing member 51, eliminating the need for additional sealing members and reducing the number of components.

[0152] In the above scheme, the first seal 51 is arranged in the accommodating groove 113, and the first seal 51 is arranged between the connecting end 1221 and the first side wall 112, so that the connecting end 1221 is sealed with the first side wall 112 to achieve 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 parts and saving manufacturing costs.

[0153] Please refer to Figure 6According to some embodiments of the present application, the connection end 1221 is provided with a second through hole 1222, and the groove wall of the accommodating 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 connection 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 side wall 112 after passing through the connecting end 1221 .

[0155] The second threaded hole 1131 may be a threaded hole opened on the groove wall of the receiving groove 113 , or the second threaded hole 1131 may be a threaded hole of a screw 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 arranged along the second direction Y. After one end of 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 connecting end 1221 and the first side wall 112.

[0157] In the above scheme, the setting of the second through hole 1222 facilitates the insertion of the second fastener 42, thereby improving assembly efficiency; the setting of the second threaded hole 1131 facilitates the assembly of the second fastener 42 with the groove wall of the accommodating groove 113, and the connection end 1221 and the first side wall 112 have a 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.

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

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

[0160] When the second side wall 122 is assembled with the corresponding first side wall 112, along the direction of the first inner surface 112b pointing to the first outer surface 112a, the second fastener 42 does not protrude from the first outer surface 112a of the corresponding first side wall 112, so that the second fastener 42 does not occupy the space outside the first side wall 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 interference between the second fastener 42 and other components.

[0162] Please refer to Figure 3 According to some embodiments of the present application, a first flow channel 1111 is formed inside the bottom wall 111, and the first flow channel 1111 is used to accommodate a heat exchange medium; a second flow channel 24 is formed inside the bracket 20, and the second flow channel 24 is used to accommodate a heat exchange medium.

[0163] The first flow channel 1111 is formed within the bottom wall 111 and is used for the flow of a heat exchange medium. After the battery device 100 is assembled, the first flow channel 1111 can accommodate a 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. For 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 material of the bottom wall 111 may have 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 within the bracket 20 and is used for the flow of a heat exchange medium. After the battery device 100 is assembled, the second flow channel 24 can contain a heat exchange medium to facilitate heat exchange with the second battery cell assembly 32 through the bracket 20. For example, when the heat exchange medium is a cooling medium, the low temperature of the heat exchange medium is transferred through the bracket 20 to the second battery cell assembly 32, thereby reducing the temperature of the second battery cell assembly 32. For another example, when the heat exchange medium is a heating medium, the high temperature of the heat exchange medium is transferred through the bracket 20 to the second battery cell assembly 32, thereby increasing the temperature of the second battery cell assembly 32.

[0166] In some embodiments, the material of the bracket 20 may have good thermal conductivity to facilitate heat exchange between the heat exchange medium and the second battery cell assembly 32 through the bracket 20 .

[0167] 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 adjust 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 so that a heat exchange medium can be set in the first flow channel 1111, so that heat exchange with the first battery cell assembly 31 can be achieved through the heat exchange medium, thereby adjusting the temperature of the first battery cell assembly 31; the second flow channel 24 is set so that a heat exchange medium can be set in the second flow channel 24, so that heat exchange with the second battery cell assembly 32 can be achieved through the heat exchange medium set in the second flow channel 24, thereby adjusting 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 adjust the temperature of the first battery cell assembly 31.

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

[0171] The first side wall 112 can be formed by extrusion.

[0172] Reinforcement ribs may be formed inside the first side wall 112 to ensure that the first side wall 112 has greater strength.

[0173] In the above solution, the first side wall 112 is a hollow structure. The first side wall 112 is light in weight, which helps to reduce the weight of the box body 10 and the overall weight of the battery device 100 .

[0174] Please refer to Figure 2 , and further reference Figure 7 , Figure 7A partial structural diagram of a battery device provided in some embodiments of the present application. According to some embodiments of the present application, the second housing 12 has openings 123 formed at both ends along the third direction X. 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 side walls 13 disposed opposite each other along the third direction X. The first battery cell assembly 31 and the second battery cell assembly 32 are disposed between the two third side walls 13. The third side wall 13 protrudes from the first side wall 112 along the bottom wall 111 toward the first battery cell assembly 31, and the two third side walls 13 respectively enclose 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 may be the length direction of the battery device 100 .

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

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

[0178] The openings 123 formed at both ends of the second box body 12 along the third direction X may correspond to the notches of the third side wall 13, and the third side wall 13 may correspondingly close the openings 123. In some embodiments, the cross section of the second box body 12 may be U-shaped.

[0179] In the above solution, by providing the third side wall 13, 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 side wall 13, thereby facilitating normal charging and discharging operations of the battery device 100. On the other hand, by closing the opening 123 by the third side wall 13, the space utilization of the battery device 100 in the third direction X can be improved, thereby increasing the volume energy density of the battery device 100.

[0180] Please refer to Figure 2 and Figure 7 According to some embodiments of the present application, the third side wall 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 box body 12 includes two connecting portions 124, which are respectively located at both ends of the second box body 12 along the third direction X. The connecting portions 124 surround an opening 123, and the connecting portions 124 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 may be an 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 may be an 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 box body 12 in the third direction X, and surrounds the opening 123 of the second box body 12 . The contour of the connecting portion 124 matches the first side surface 133 of the third side wall 13 .

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

[0184] In the above solution, the connection portion 124 is connected to the first side surface 133 of the third side wall 13 , thereby improving the connection stability and sealing performance between the second box body 12 and the third side wall 13 .

[0185] Please refer to Figure 2 and Figure 3 According to some embodiments of the present application, the third side wall 13 may include a first part 134 and a second part 135 connected to each other, and the first part 134 and the second part 135 are distributed along the first direction Z, the first part 134 is connected to the bottom wall 111 and the two first side walls 112, the bottom wall 111, the two first side walls 112, the first part 134 of the two third side walls 13, and the bracket 20 form a first accommodating space 10a; the second part 135 is connected to the top wall 121 and the two second side walls 122, and the bracket 20, the top wall 121, the two second side walls 122, and the second part 135 of the two third side walls 13 form a second accommodating 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 surfaces of the first portion 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 arranged at an end of the third side wall 13 away from the bottom wall 111, and the two second flat surfaces 133b are respectively arranged 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 to ensure a smooth transition between the first flat surface 133a and the second flat surface 133b.

[0187] The first flat surface 133a may be the upper surface of the third sidewall 13 and may be a flat surface. The second flat surface 133b may be the outer side surface of the third sidewall 13 and may 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 a 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 have a non-perpendicular transition relationship.

[0188] In some embodiments, the transition surface 133c may be a curved surface or an inclined surface.

[0189] The first flat surface 133a and the second flat surface 133b are non-coplanar surfaces. Therefore, a transition surface 133c is provided to achieve a smooth transition between the first flat surface 133a and the second flat surface 133b. This facilitates forming a good sealing surface between the connecting portion 124 and the first side surface 133, thereby improving the sealing performance of the battery device 100.

[0190] In some embodiments, the first portion 134 and the second portion 135 may be separate structures to facilitate assembly of the first box body 11 and the second box body 12 with the third side wall 13. In another embodiment, the first portion 134 and the second portion 135 are integrally formed to facilitate processing and manufacturing.

[0191] Please refer to Figure 7 , and further reference Figure 8 , Figure 8 Schematic diagram of the assembly of the connection portion and the third side wall provided in some embodiments of the present application. According to some embodiments of the present application, the connection portion 124 is provided with a third through hole 1241, and the first side surface 133 is provided with a third threaded hole 1331. The battery device 100 also includes a third fastener 43. The third fastener 43 passes through the third through hole 1241 and connects with the third threaded hole 1331 to connect the connection portion 124 to the third side wall 13.

[0192] The third through hole 1241 is a hole that penetrates the connecting portion 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 portion 124 .

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

[0194] The third fastener 43 can be a bolt or a fastener with a threaded section. The third fastener 43 is arranged along the first direction Z. After one end of 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, thereby improving assembly efficiency; the setting of the third threaded hole 1331 facilitates the assembly of the third fastener 43 with the first side surface 133, and the connection between the connecting portion 124 and the third side wall 13 has a higher connection stability, which is conducive to the assembly and disassembly of the connecting portion 124 and the third side wall 13.

[0196] In some embodiments, there are multiple third threaded holes 1331, each of which is spaced apart along the circumference of the third sidewall 13. There are multiple third through-holes 1241, with each third threaded hole 1331 corresponding to each third through-hole 1241. There are multiple third fasteners 43, with each third fastener 43 mating with each third through-hole 1241 and each third threaded hole 1331. The provision of multiple third through-holes 1241, multiple third threaded holes 1331, and multiple third fasteners 43 enhances the stability of the connection between the connecting portion 124 and the third sidewall 13.

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

[0198] The second sealing member 52 may be a component having sealing properties and disposed between the connecting portion 124 and the first side surface 133. In some embodiments, the second sealing member 52 may be a sealant or a gasket, and the second sealing member 52 is sandwiched between the first side surface 133 and the connecting portion 124. For example, the second sealing member 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 the second sealing member 52 between the connecting portion 124 and the first side surface 133 , the sealing between the connecting portion 124 and the first side surface 133 can be improved, thereby improving the sealing of the battery device 100 .

[0200] In some embodiments, the first sealing member 51 and the second sealing member 52 may be independent structures, and the first sealing member 51 and the second sealing member 52 are connected by bonding or an intermediate connecting member.

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

[0202] According to some embodiments of the present application, an electrical device is further provided, which includes a battery device 100 provided according to any of the above embodiments, and the battery device 100 is used to provide electrical energy.

[0203] The power-consuming device may be any of the aforementioned devices or systems using the battery device 100 as a power source.

[0204] According to some embodiments of this application, please refer to Figures 2 to 8 The embodiment of the present application provides a battery device 100 , which includes a box 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 box body 10 includes a first box body 11 and a second box body 12 . The first box body 11 and the second box body 12 are arranged opposite to each other along a first direction Z. The first box body 11 and the second box body 12 are buckled together.

[0206] 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 bottom wall 111 supports the first battery cell assembly 31. The first side wall 112 has a first outer surface 112a and a first inner surface 112b that oppose each other along its thickness, and a first end surface 112c facing away from the bottom wall 111. The first end surface 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. The receiving groove 113 extends to the first end surface 112c along the first direction Z and extends through both ends of the first side wall 112 along the third direction X.

[0207] The bracket 20 is disposed within the housing 10. The first housing 11 and the bracket 20 define a first storage space 10a. The second housing 12 and the bracket 20 define a second storage space 10b. The first battery cell assembly 31 is disposed within the first storage space 10a, and the second battery cell assembly 32 is disposed within the second storage space 10b. Along the second direction Y, the distance W between the first battery cell assembly 31 and the first inner surface 112b satisfies the requirement of W ≤ 8 mm.

[0208] The bracket 20 is located on a side of the first side wall 112 facing away from the bottom wall 111. The bracket 20 is connected to the first end surface 112c and supports the second battery cell assembly 32. The bracket 20 is provided with a first through hole 21. The first end surface 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 connects with the first threaded hole 112d to connect the bracket 20 to the first side wall 112.

[0209] The second housing 12 includes a top wall 121 and two second side walls 122. The top wall 121 is disposed opposite the bottom wall 111 along the first direction Z. The two second side walls 122 are spaced apart along the second direction Y, with the top wall 121 connecting the two second side walls 122. The second side walls 122 have a connecting end 1221 distal from the top wall 121. The connecting end 1221 is disposed within the receiving groove 113. A first sealing member 51 is disposed within the receiving groove 113 and between the connecting end 1221 and the first side walls 112 along the second direction Y. The connecting end 1221 is provided with a second through hole 1222. The 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. The second fastener 42 passes through the second through hole 1222 and connects with 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 the embodiment of the present application, the bracket 20 is located on the side of the first side wall 112 away from the bottom wall 111, and the bracket 20 is connected to the first end surface 112c. There is no need to set a structure for connecting with the bracket 20 on the first inner surface 112b of the first side wall 112. 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 arranged in the box body 10 to improve the space utilization between the two first side walls 112, thereby improving the volume energy density of the battery device 100. The first fastener 41 passes through the first through-hole 21 and connects to the first threaded hole 112d, facilitating assembly of the first fastener 41 with the first end face 112c. This provides a highly stable connection between the bracket 20 and the first side wall 112, facilitating assembly and disassembly of the bracket 20 and the first side wall 112, and facilitating 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 wall of the accommodating groove 113 are sealed in the second direction Y by the first seal 51, the seal between the second housing 12 and the first housing 11 can be achieved solely by the first seal 51, eliminating the need for additional seals. This reduces component count and saves manufacturing costs. The second fastener 42 passes through the second through hole 1222 and is connected to the second threaded hole 1131, which facilitates the assembly of the second fastener 42 with the groove wall of the accommodating groove 113. The connection end 1221 and the first side wall 112 have a 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 the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A battery device, characterized in that: include: The box body includes a first box body and a second box body, wherein the first box body and the second box body are arranged opposite to each other along a first direction, and the first box body and the second box body are buckled together; The bracket is arranged in the box body, the first box body and the bracket form a first accommodation space, and the second box body and the bracket form a second accommodation space; a first battery cell assembly and a second battery cell assembly, wherein the first battery cell assembly is disposed in the first accommodation space and the second battery cell assembly is disposed in the second accommodation space; In which, the first box body includes a bottom wall and two first side walls arranged opposite to each other along the second direction, the bottom wall supports the first battery monomer 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 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 bracket is connected to the first end face, the bracket supports the second battery monomer assembly, and the second direction is perpendicular to the first direction.

2. The battery device according to claim 1, wherein: The bracket is provided with a first through hole, and the first end surface 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 by colloid.

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 is protruded from the first surface, and along the second direction, the protrusion is located between the first through hole and the second battery cell assembly.

5. The battery device according to claim 1, wherein: Along the second direction, a distance W between the first battery cell assembly and the first inner surface satisfies W≤8 mm.

6. The battery device according to claim 1, wherein: The first outer surface is provided with a receiving groove, and along the first direction, the receiving groove extends to the first end surface; The second box body 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 accommodating groove, and the connecting end is connected to the first side wall.

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

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 claim 6, characterized in that The battery device further includes a first sealing member, which is disposed in the receiving groove and between the connecting end and the first side wall along the second direction.

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 accommodating 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 a direction from the first inner surface to the first outer surface, the second fastening member does not protrude from the first outer surface.

12. The battery device according to claim 1, wherein: A first flow channel is formed inside the bottom wall, and the first flow channel is used to accommodate a heat exchange medium; A second flow channel is formed inside the bracket, and the second flow channel is used to accommodate a heat exchange medium.

13. The battery device according to claim 1, wherein: A cavity is formed inside the first side wall.

14. The battery device according to any one of claims 1 to 13, characterized in that: The second box body is respectively formed with openings at both ends along the third direction, and the third direction, the second direction and the first direction are perpendicular to each other; The box body further includes two third side walls arranged opposite to each other along the third direction, and the first battery cell assembly and the second battery cell assembly are both arranged between the two third side walls; Along the direction of the bottom wall pointing toward the first battery monomer assembly, the third side wall protrudes from the first side wall, and the two third side walls respectively close the two openings.

15. The battery device according to claim 14, characterized in that The third side wall 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 box body includes two connecting parts, which are respectively located at the two ends of the second box body along the third direction. The connecting parts surround the opening and are connected to the first side surface.

16. The battery device according to claim 15, characterized in that The connecting portion 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 portion to the third side wall.

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

18. An electrical device, characterized in that: The battery device comprises the battery device according to any one of claims 1 to 17, wherein the battery device is used to provide electrical energy.

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