Battery device and electric device

Abstract

Embodiments of the present application provide a battery device and an electric device. The battery device comprises a housing, a support frame, a first battery cell assembly, and a second battery cell assembly. The housing comprises a first housing and a second housing, and the first housing and the second housing are arranged opposite to each other in a first direction; the first housing and the support frame define a first accommodating space, and the second housing and the support frame define 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 comprises a bottom wall and two first side walls arranged opposite to each other in a second direction; the bottom wall supports the first battery cell assembly, and the bottom wall is connected to the two first side walls; each first side wall has a first outer surface, a first inner surface, and a first end face facing away from the bottom wall, and the first end face is located between the first outer surface and the first inner surface; the support frame is connected to the first end faces, and the support frame supports the second battery cell assembly. The technical solution of the present application can improve the energy density of battery devices.

Description

Battery device and electric device Cross-reference to related applications

[0001] The present application claims priority to Chinese Patent Application CN202411288461.3, filed on September 13, 2024, entitled "Battery device and electric device", the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of battery devices, in particular to a battery device and an electric device. BACKGROUND

[0003] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy-saving and environmentally friendly advantages. For electric vehicles, battery technology is an important factor for their development.

[0004] In the manufacturing process of the battery device, the energy density of the battery device is a problem that cannot be ignored. Therefore, how to improve the energy density of the battery device is a technical problem that needs to be solved in battery technology. SUMMARY

[0005] The present application provides a battery device and an electric device, which can improve the energy density of the battery device.

[0006] The present application is achieved by the following technical solutions:

[0007] In a first aspect, the present application provides a battery device, which includes a box body, a support, a first battery monomer assembly and a second battery monomer assembly. The box body includes a first box body and a second box body, the first box body and the second box body are oppositely arranged along a first direction, and the first box body and the second box body are buckled. The support is arranged in the box body, the first box body and the support form a first containing space, and the second box body and the support form a second containing space. The first battery monomer assembly is arranged in the first containing space, and the second battery monomer assembly is arranged in the second containing space. The first box body includes a bottom wall and two first side walls oppositely arranged along a second direction, the bottom wall supports the first battery monomer assembly, the bottom wall is connected with the two first side walls, the first side wall has a first outer surface and a first inner surface opposite along the thickness direction thereof, and a first end surface away from the bottom wall, the first end surface is located between the first outer surface and the first inner surface, the support is connected to the first end surface, the support supports the second battery monomer assembly, and the second direction is perpendicular to the first direction.

[0008] According to the battery device provided in the embodiments of the present application, the first box body and the second box body are arranged opposite to each other along the first direction, the support is arranged in the box body and divides the box body into the first accommodating space and the second accommodating space, the first battery monomer assembly is accommodated in the first accommodating space, and the second battery monomer assembly is accommodated in the second accommodating space, so that the first battery monomer assembly and the second battery monomer assembly are arranged in a stacked manner along the first direction. In the embodiments of the present application, along the first direction, the support is arranged on the side of the first side wall away from the bottom wall, the support can be arranged above the first side wall, the support is connected to the first end surface of the first side wall away from the bottom wall, and no structure for connecting the support needs to be arranged on the first inner surface of the first side wall. Therefore, the first battery monomer assembly can be arranged close to the first inner surface, so that the distance between the first battery monomer assembly and the first inner surface of the first side wall can be small, and more first battery monomer assemblies can be arranged in the box body, so as to improve the space utilization rate between the two first side walls and improve the volume energy density of the battery device.

[0009] According to some embodiments of the present application, the support 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 further comprises a first fastener, the first fastener passes through the first through hole and is connected with the first threaded hole, so as to connect the support to the first side wall.

[0010] In the above scheme, the first through hole is arranged, so that the first fastener can pass through, thereby improving the assembly efficiency; the first threaded hole is arranged, so that the first fastener can be assembled with the first end surface, the support and the first side wall have high connection stability, the assembly and disassembly of the support and the first side wall are facilitated, and the maintenance and replacement of the first battery monomer assembly or the second battery monomer assembly are facilitated.

[0011] According to some embodiments of the present application, the second battery monomer assembly and the support are bonded by a colloid.

[0012] In the above scheme, the second battery monomer assembly and the support are bonded by a colloid, and the process is simple and easy to operate.

[0013] According to some embodiments of the present application, the support comprises a support body and a protruding portion, the support body bears the second battery monomer assembly, the support body has a first surface away from the bottom wall, and the protruding portion protrudes from the first surface. Along the second direction, the protruding portion is located between the first through hole and the second battery monomer assembly.

[0014] In the above scheme, the protruding portion protrudes from the first surface, so that a block can be formed between the first mounting hole and the second monomer assembly, and the risk that the colloid flows into the first through hole and affects the assembly of the first fastener and the first through hole is reduced.

[0015] According to some embodiments of the present application, along the second direction, the distance between the first battery monomer assembly and the first inner surface is W, and W≤8mm is satisfied.

[0016] In the above scheme, the distance between the first battery monomer assembly and the first inner surface satisfies the above relationship, the distance between the first battery assembly and the first inner surface is smaller, more first battery monomer assemblies can be arranged, the space utilization between the two first side walls is improved, and the volume energy density of the battery device is improved.

[0017] According to some embodiments of the application, the first outer surface is provided with a receiving groove extending to the first end face in the first direction; the second box body includes a top wall and two second side walls, the top wall is arranged opposite to the bottom wall in the first direction, the two second side walls are arranged in the second direction, and the top wall is connected to 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.

[0018] In the above scheme, the connecting end is arranged in the receiving groove and connected to the first side wall, so as 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 in the first direction, and the operation is simple.

[0019] According to some embodiments of the application, the thickness of the connecting end is less than the thickness of the first side wall.

[0020] In the above scheme, the first side wall has a larger thickness, so that the first side wall still has high strength after the receiving groove is arranged in the first side wall, and the connecting end has high connection reliability with the first side wall.

[0021] According to some embodiments of the application, in the direction of the first inner surface pointing to the first outer surface, the connecting end does not protrude from the first outer surface.

[0022] In the above scheme, the connecting end does not protrude from the first outer surface, so as to occupy smaller assembly space after the connecting end is connected to the first side wall, and reduce the risk of interference between the connecting end and other components.

[0023] According to some embodiments of the application, the battery device further comprises a first sealing member arranged in the receiving groove, and the first sealing member is arranged between the connecting end and the first side wall in the second direction.

[0024] In the above scheme, the first sealing member is arranged in the receiving groove, and the first sealing member 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, the sealing between the second side wall and the first side wall is realized, the first battery monomer assembly and the second battery monomer assembly share the same sealing structure, the number of parts is reduced, and the manufacturing cost is saved.

[0025] 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 further comprises a second fastener, the second fastener passes through the second through hole and is connected with the second threaded hole, so as to connect the connecting end to the first side wall.

[0026] In the above scheme, the second through hole is provided to facilitate the second fastener to pass through, thereby improving the assembly efficiency; the second threaded hole is provided to facilitate the assembly of the second fastener and the groove wall of the accommodating groove, so that the connecting end and the first side wall have higher connection stability, which facilitates the assembly and disassembly of the connecting end and the first side wall, and facilitates the maintenance and replacement of the first battery monomer assembly or the second battery monomer assembly.

[0027] According to some embodiments of the present application, in the direction of the first inner surface pointing to the first outer surface, the second fastener does not protrude from the first outer surface.

[0028] In the above scheme, the second fastener does not protrude from the first outer surface, thereby reducing the space occupation of the structure after the second fastener connects the connecting end to the first side wall.

[0029] According to some embodiments of the present application, the inside of the bottom wall is formed with a first flow channel for accommodating a heat exchange medium; and the inside of the support is formed with a second flow channel for accommodating the heat exchange medium.

[0030] In the above scheme, the first flow channel is provided to facilitate the arrangement of the heat exchange medium in the first flow channel, so as to facilitate the heat exchange between the heat exchange medium and the first battery monomer assembly, and adjust the temperature of the first battery monomer assembly; the second flow channel is provided to facilitate the arrangement of the heat exchange medium in the second flow channel, so as to facilitate the heat exchange between the heat exchange medium arranged in the second flow channel and the second battery monomer assembly, and adjust the temperature of the second battery monomer assembly; at the same time, since the support is located between the first battery monomer assembly and the second battery monomer assembly, the support can also adjust the temperature of the first battery monomer assembly.

[0031] According to some embodiments of the present application, the inside of the first side wall is formed with a cavity.

[0032] In the above scheme, the first side wall is a hollow structure, and the first side wall has a lighter weight, thereby facilitating the reduction of the weight of the box body and the overall weight of the battery device.

[0033] According to some embodiments of the present application, the second box body is formed with openings at both ends in a third direction, the third direction, the second direction and the first direction are perpendicular to each other; the box body further comprises two third side walls oppositely arranged along the third direction, and the first battery monomer assembly and the second battery monomer assembly are arranged between the two third side walls; in the direction of the bottom wall pointing to 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.

[0034] In the above scheme, by arranging the third side wall, on the one hand, components such as explosion-proof valves, water-cooled connectors or high-low voltage connectors can be mounted on the third side wall, facilitating normal charging and discharging of the battery device; on the other hand, by closing the opening with the third side wall, the space utilization of the battery device in the third direction can be improved, and the volumetric energy density of the battery device can be improved.

[0035] According to some embodiments of the present application, the third side wall has a second inner surface facing the second battery monomer assembly, a second outer surface facing away from the second battery monomer assembly, and a first side surface connecting the second inner surface and the second outer surface, and the second box body includes two connecting portions, the two connecting portions are respectively located at two ends of the second box body in the third direction, the connecting portions surround the opening, and the connecting portions are connected to the first side surface.

[0036] In the above scheme, by connecting the connecting portion and the first side surface of the third side wall, the connection stability and the sealing performance of the second box body and the third side wall can be improved.

[0037] According to some embodiments of the present application, the connecting portion is provided with a third through hole, the first side surface is provided with a third threaded hole, and the battery device further includes a third fastener, the third fastener passes through the third through hole and is connected with the third threaded hole, so as to connect the connecting portion to the third side wall.

[0038] In the above scheme, the third through hole is arranged, so as to facilitate the arrangement of the third fastener, and the assembly efficiency is improved; the third threaded hole is arranged, so as to facilitate the assembly of the third fastener and the first side surface, and the connection stability between the connecting portion and the third side wall is high, which is beneficial to the assembly and disassembly of the connecting portion and the third side wall.

[0039] According to some embodiments of the present application, the battery device further includes a second sealing member arranged between the connecting portion and the first side surface.

[0040] In the above scheme, by arranging 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, and the sealing performance of the battery device can be improved.

[0041] In a second aspect, the embodiments of the present application also provide a power utilization device, which includes the battery device provided by any of the above embodiments, and the battery device is used to provide electric energy.

[0042] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as a limitation to the scope. For those of ordinary skill in the art, other related drawings can also be obtained without creative effort based on these drawings.

[0044] Fig. 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application;

[0045] Fig. 2 is a structural exploded schematic diagram of a battery device according to some embodiments of the present application;

[0046] Fig. 3 is a sectional view of the battery device according to some embodiments of the present application;

[0047] Fig. 4 is an enlarged view of a portion of Fig. 3;

[0048] Fig. 5 is an enlarged view of a portion of Fig. 4;

[0049] Fig. 6 is a sectional view of a portion of the battery device according to some embodiments of the present application;

[0050] Fig. 7 is a schematic diagram of a portion of the battery device according to some embodiments of the present application;

[0051] Fig. 8 is an assembly schematic diagram of a connecting portion and a third side wall according to some embodiments of the present application.

[0052] In the drawings, the drawings are not drawn according to the actual scale.

[0053] Label description: 100 - battery device; 10 - box; 10a - first accommodating space; 10b - second accommodating space; 11 - first box; 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 - accommodating groove; 1131 - second threaded hole; 12 - second box; 121 - top wall; 122 - second side wall; 1221 - connecting end; 1222 - second through hole; 123 - opening; 124 - connecting part; 1241 - third through hole; 13 - third side wall; 131 - second inner surface; 132 - second outer surface; 133 - first side face; 133a - first flat face; 133b - second flat face; 133c - transition face; 1331 - third threaded hole; 134 - first part; 135 - second part; 20 - bracket; 21 - first through hole; 22 - bracket body; 22a - first surface; 23 - protruding part; 24 - second flow channel; 31 - first battery monomer assembly; 32 - second battery monomer assembly; 41 - first fastener; 42 - second fastener; 43 - third fastener; 51 - first sealing member; 52 - second sealing member; 200 - controller; 300 - motor; 1000 - vehicle; X - third direction; Y - second direction; Z - first direction. DETAILED DESCRIPTION

[0054] The embodiments of the present application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description and the accompanying drawings of the following examples are used to exemplarily explain the principles of the present application, but cannot be used to limit the scope of the present application, i.e., the present application is not limited to the described examples.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the description and claims of the present application as well as the above abstract are not intended to be technical and scientific terms, but are intended to cover not exclusively including.

[0056] The terms "first", "second", etc. in the specification and claims of the present application or in the above description of drawings are used to distinguish different objects, and are not used to describe a specific order or primary and secondary relationship.

[0057] Reference within this application to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. As used in this application, the term "or" is intended to mean an inclusive "or" rather than an exclusive "or". That is, unless specified otherwise, or clear from context, "X employs A or B" means that X employs A or B or both. In addition, the term "another" is used interchangeably with "one or more". As used in this application, the term "another" is intended to mean "at least one" or "one or more", unless specified otherwise.

[0058] In the description of the application, it is necessary to explain that, unless otherwise expressly specified and limited, the terms "mount", "connect", "connection", "attach" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0059] In this application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in this application generally represents that the front and rear associated objects have an "or" relationship.

[0060] In this application, "multiple" means more than two (including two), and similarly, "multiple groups" means more than two groups (including two groups), and "multiple pieces" means more than two pieces (including two pieces).

[0061] The battery device mentioned in the embodiments of the application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a hybrid manner through a busbar component.

[0062] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0063] In some embodiments, the battery device can be a battery pack, which includes a box body and one or more battery cell assemblies accommodated in the box body.

[0064] As an example, the battery cell assembly can be a battery module, which can be accommodated in the box body by fixing the battery module in the box body.

[0065] As an example, the battery cell assembly can also be housed in the case by directly fixing a plurality of battery cells to the case.

[0066] As an example, the case can include a first case and a second case. The first case and the second case are coupled so that an inner portion of the case forms a closed space to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or unsealed. The first case can be a top cover or a bottom plate.

[0067] As an example, the case can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected with the frame so that an inner portion of the case forms a closed space to accommodate the battery cell assembly.

[0068] As an example, the case can be part of a chassis structure of a vehicle. For example, the top cover of the case can be at least part of a floor of the vehicle, or the frame of the case can be at least part of a cross beam and a longitudinal beam of the vehicle.

[0069] In some embodiments, the battery device refers to an energy storage device, and the energy storage device includes a case, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0070] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging.

[0071] The battery cell can be, but is not limited to, a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc.

[0072] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are embedded and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive electrode and the negative electrode from short-circuiting, and at the same time, the active ions can pass through.

[0073] In some embodiments, the positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material arranged on at least one surface of the positive electrode current collector.

[0074] As an example, the positive electrode current collector has two opposite surfaces in the thickness direction of itself, and the positive electrode active material is arranged on any one or both of the two opposite surfaces of the positive electrode current collector.

[0075] As an example, the positive electrode current collector can employ a metal foil or a composite current collector. For example, as a metal foil, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, etc. that is surface silver-plated can be employed. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0076] As an example, the positive electrode active material can include at least one of lithium-containing phosphates, lithium transition metal oxides, and modified compounds of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive electrode active material can also be used.

[0077] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0078] As an example, the negative electrode current collector can employ a metal foil or a composite current collector. For example, as a metal foil, aluminum that is surface silver-plated, stainless steel that is surface silver-plated, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, etc. can be employed.

[0079] In some embodiments, the negative electrode current collector has two surfaces opposite in the thickness direction thereof, and the negative electrode active material is disposed on either one or both of the two opposite surfaces of the negative electrode current collector.

[0080] As an example, the negative electrode active material can employ a negative electrode active material for a battery that is well known in the art. As an example, the negative electrode active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material can be selected from at least one of elemental tin, a tin oxide compound, and a tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery negative electrode active material can also be used. These negative electrode active materials can be used alone only one or in combination of two or more.

[0081] In some embodiments, the separator is a separator film. The present application does not have a particular limitation on the type of the separator film, and any well-known porous structure separator film having good chemical stability and mechanical stability can be used.

[0082] As an example, the main material of the separator film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator film can be a single layer film or a multi-layer composite film, and is not particularly limited. When the separator film is a multi-layer composite film, the materials of the respective layers can be the same or different, and are not particularly limited. The separator can be a separate component located between the positive and negative electrodes, or can be attached to the surfaces of the positive and negative electrodes.

[0083] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive and negative electrodes, and functions to transport ions and separate the positive and negative electrodes.

[0084] In some embodiments, the electrode assembly is a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound to form the jelly-roll structure.

[0085] In some embodiments, the electrode assembly is a stack structure.

[0086] In some embodiments, the battery cell can include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can be a steel case, an aluminum case, a plastic case (e.g., polypropylene), a composite metal case (e.g., a copper-aluminum composite case), or an aluminum-plastic film, etc.

[0087] In some embodiments, the housing includes an end cap and a case body, and the case body is provided with an opening, and the end cap closes the opening to form a sealed space for accommodating the electrode assembly and the electrolyte, etc. The case body can be provided with one or more openings. The end cap can also be provided with one or more openings.

[0088] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab, or can be indirectly connected to the tab through an adapter. The electrode terminal can be provided on the end cap or on the case body.

[0089] In some embodiments, an explosion-proof valve is provided on the housing. The explosion-proof valve is used to release the internal pressure of the battery cell.

[0090] In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a sealed structure, the housing can function to protect the electrode assembly and prevent leakage of the electrolyte, etc. When the housing is a non-sealed structure, the housing can function to protect the electrode assembly, and a sealing bag can be further included between the housing and the electrode assembly, and the sealing bag is used to encapsulate the electrode assembly and the electrolyte, etc. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film.

[0091] As an example, the battery cells can be cylindrical battery cells, prismatic battery cells, pouch battery cells, or other shaped battery cells, including square battery cells, blade battery cells, multi-prismatic battery cells, such as hexagonal battery cells, etc.

[0092] The development of battery technology needs to consider various design factors, such as reliability, discharge capacity, charge-discharge rate, and other performance parameters, and in addition, the energy density of the battery device also needs to be considered. The energy density of the battery device includes the volume energy density and the weight energy density.

[0093] 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 arranged on the inner surface of the side wall of the lower box body accommodating the lower layer of battery cell assemblies, and a bracket carrying the upper layer of battery cell assemblies is connected to the boss, so that the space below the boss inside the lower box body cannot place the battery cell assemblies, which causes space waste, resulting in low utilization of the internal space of the box body, and low volume energy density of the battery device.

[0094] In view of this, in order to solve the problem of low utilization of the internal space of the box body and low volume energy density of the battery device, the embodiments of the present application provide a battery device, which includes a box body, a bracket, a first battery cell assembly and a second battery cell assembly. The box body includes a first box body and a second box body, the first box body and the second box body are oppositely arranged along a first direction, and the first box body and the second box body are buckled; the bracket is arranged in the box body, the first box body and the bracket form a first accommodating space, and the second box body and the bracket form 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. Wherein, the first box body includes a bottom wall and two first side walls oppositely arranged along a second direction, the bottom wall supports the first battery cell assembly, the bottom wall is connected to the two first side walls, the first side wall has a first outer surface and a first inner surface opposite along the thickness direction thereof, and a first end surface 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, the bracket supports the second battery cell assembly, and the second direction is perpendicular to the first direction. The internal space utilization rate of the box body of the battery device is high, and the battery device has high volume energy density.

[0095] In the battery device, the first box body and the second box body are oppositely arranged in the first direction, the first box body can be a lower box body, and the second box body can be an upper box body. The support is arranged in the box body and divides the box body into a first containing space and a second containing space. The first battery monomer assembly is contained in the first containing space, and the second battery monomer assembly is contained in the second containing space, so that the first battery monomer assembly and the second battery monomer assembly are arranged in a stacked manner in the first direction. In the first direction, the support is arranged on the side of the first side wall away from the bottom wall, and the support can be located above the first side wall. The support is connected to the first end surface of the first side wall away from the bottom wall. The first inner surface of the first side wall does not need to be provided with a structure for connecting with the support. The first battery monomer assembly can be arranged close to the first inner surface, so that the distance between the first battery monomer assembly and the first inner surface of the first side wall can be small. More first battery monomer assemblies can be arranged in the box body, so as to improve the space utilization rate between the two first side walls and improve the volume energy density of the battery device.

[0096] The battery device disclosed in the embodiments of the present application can be used in an electric device such as a vehicle, a ship or an aircraft, but is not limited thereto. The power supply system of the electric device can be composed of the battery device disclosed in the present application.

[0097] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery devices, for example, mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft including airplanes, rockets, space shuttles and spacecraft.

[0098] The following embodiments are described for convenience with a vehicle as an example of an electric device of an embodiment of the present application.

[0099] Please refer to FIG. 1, which is a structural schematic diagram of a vehicle provided by some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, the head or the tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as an operating power source of the vehicle 1000, for example, for the working power demand of the circuit system of the vehicle 1000, for example, for the working power demand of the vehicle 1000 during starting, navigation and running.

[0100] The vehicle 1000 can 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, for the working power demand of the vehicle 1000 during starting, navigation and running.

[0101] In some embodiments of the present application, the battery device 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing the fuel or natural gas to provide driving power for the vehicle 1000.

[0102] Please refer to FIG. 2 to FIG. 5, FIG. 2 is a structural exploded view of the battery device provided by some embodiments of the present application, FIG. 3 is a sectional view of the battery device provided by some embodiments of the present application, FIG. 4 is a partial enlarged view of A in FIG. 3, and FIG. 5 is a partial enlarged view of B in FIG. 4. The embodiments of the present application provide a battery device 100, which comprises a box body 10, a support 20, a first battery monomer assembly 31 and a second battery monomer assembly 32. The box body 10 comprises a first box 11 and a second box 12, the first box 11 and the second box 12 are oppositely arranged along a first direction Z, and the first box 11 and the second box 12 are buckled; the support 20 is arranged in the box body 10, the first box 11 and the support 20 form a first containing space 10a, and the second box 12 and the support 20 form a second containing space 10b; the first battery monomer assembly 31 is arranged in the first containing space 10a, and the second battery monomer assembly 32 is arranged in the second containing space 10b. Wherein, the first box 11 comprises a bottom wall 111 and two first side walls 112 oppositely arranged along a second direction Y, the bottom wall 111 supports the first battery monomer assembly 31, the bottom wall 111 is connected with the two first side walls 112, the first side wall 112 has a first outer surface 112a and a first inner surface 112b opposite along the thickness direction thereof, and a first end surface 112c 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 support 20 is connected to the first end surface 112c, and the support 20 supports the second battery monomer assembly 32, and the second direction Y is perpendicular to the first direction Z.

[0103] In FIG. 2 to FIG. 5, the direction indicated by the letter Z can be the first direction, and the first direction Z can be parallel to the thickness direction of the bottom wall 111; the direction indicated by the letter Y can be the second direction, and the second direction Y can be perpendicular to the thickness direction of the bottom wall 111. The first direction Z can be the height direction of the battery device 100, and the second direction Y can be the width direction of the battery device 100.

[0104] The box body 10 is used to provide the containing space for the first battery monomer assembly 31 and the second battery monomer assembly 32.

[0105] The first box 11 and the second box 12 are oppositely arranged along the first direction Z, and the first box 11 and the second box 12 are buckled, so as to form the containing space containing the first battery monomer assembly 31 and the second battery monomer assembly 32. In some embodiments, the first direction Z can be a vertical direction, the first box 11 can be a lower box, and the second box 12 can be an upper box.

[0106] The first battery cell assembly 31 can include a plurality of first battery cells, which can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the plurality of first battery cells are connected in series and in parallel. The first battery cell assembly 31 can further include other structures. For example, the first battery cell assembly 31 can further include a first busbar component for realizing electrical connection between the plurality of first battery cells.

[0107] The second battery cell assembly 32 can include a plurality of second battery cells, which can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the plurality of second battery cells are connected in series and in parallel. The second battery cell assembly 32 can further include other structures. For example, the second battery cell assembly 32 can further include a second busbar component for realizing electrical connection between the plurality of second battery cells.

[0108] The bracket 20 is a component for carrying the second battery cell assembly 32. The bracket 20 has a certain strength. The material of the bracket 20 can be metal, such as aluminum alloy, stainless steel, etc. The material of the bracket 20 can also be hard non-metal, such as engineering plastic.

[0109] The bracket 20 is arranged in the box body 10. The bracket 20 divides the internal space of the box body 10 into a first accommodating space 10a and a second accommodating space 10b. For example, the bottom wall 111, the two first side walls 112, and the bracket 20 enclose the first accommodating space 10a. The bracket 20 and the second box body 12 enclose the second accommodating space 10b.

[0110] The first inner surface 112b is a surface of the first side wall 112 that encloses the first accommodating space 10a and faces the first battery cell assembly 31. The first outer surface 112a is a surface of the first side wall 112 that faces away from the first accommodating space 10a and 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 side wall 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 can be connected to the first inner surface 112b, and the other end of the first end surface 112c in the second direction Y can be provided with a groove.

[0111] The first side wall 112 is connected to the bottom wall 111 at one end along the first direction Z. The end surface of the other end of the first side wall 112 along the first direction Z forms the first end surface 112c.

[0112] The bracket 20 is connected to the first end face 112c, and the bracket 20 can be arranged on the side of the first side wall 112 away from the bottom wall 111, for example, the bracket 20 can be arranged above the first side wall 112.

[0113] The second battery monomer assembly 32 is supported by the bracket 20, and the first battery monomer assembly 31 is supported by the bottom wall 111. The bracket 20 is connected to the first end face 112c. During assembly of the battery device 100, the assembly of the first battery monomer assembly 31 and the bottom wall 111 and the assembly of the second battery monomer assembly 32 and the bracket 20 can be performed synchronously, which can shorten the assembly waiting time and facilitate improving the assembly efficiency.

[0114] According to the battery device 100 of the embodiments 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 box body 10 into the first containing space 10a and the second containing space 10b. The first battery monomer assembly 31 is contained in the first containing space 10a, and the second battery monomer assembly 32 is contained in the second containing space 10b, so as to arrange the first battery monomer assembly 31 and the second battery monomer assembly 32 in a stacked manner along 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, and the bracket 20 can be located above the first side wall 112. The bracket 20 is connected to the first end face 112c of the first side wall 112 away from the bottom wall 111. The first inner surface 112b of the first side wall 112 does not need to be provided with a structure for connecting with the bracket 20. The first battery monomer assembly 31 can be arranged close to the first inner surface 112b, so that the distance between the first battery monomer assembly 31 and the first inner surface 112b of the first side wall 112 can be smaller. More first battery monomer assemblies 31 can be arranged in the box body 10, so as to improve the space utilization rate between the two first side walls 112, thereby improving the volume energy density of the battery device 100.

[0115] Please refer to FIG. 4 and FIG. 5. According to some embodiments of the present application, the bracket 20 is provided with a first through hole 21, the first end face 112c is provided with a first threaded hole 112d corresponding to the first through hole 21, and the battery device 100 further comprises a first fastener 41. The first fastener 41 passes through the first through hole 21 and is connected with the first threaded hole 112d, so as to connect the bracket 20 to the first side wall 112.

[0116] The thickness direction of the bracket 20 can be parallel to the first direction Z, and the first through hole 21 is a hole penetrating the bracket 20 along the first direction Z, so that the first fastener 41 is connected with the first side wall 112 after passing through the bracket 20.

[0117] The first threaded hole 112d can be a threaded hole formed on the first end face 112c, or the first threaded hole 112d can be a threaded hole of a threaded sleeve embedded on the first end face 112c.

[0118] 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. One end of the threaded section of the first fastener 41 passes through the first through hole 21 and is screwed with the first threaded hole 112d, so as to improve the connection stability of the bracket 20 and the first side wall 112.

[0119] In the above scheme, the first through hole 21 is arranged to facilitate the arrangement of the first fastener 41, thereby improving the assembly efficiency. The first threaded hole 112d is arranged to facilitate the assembly of the first fastener 41 and the first end face 112c, thereby improving the connection stability between the bracket 20 and the first side wall 112, facilitating the assembly and disassembly of the bracket 20 and the first side wall 112, and facilitating the maintenance and replacement of the first battery monomer assembly 31 or the second battery monomer assembly 32.

[0120] In some embodiments, the number of first through holes 21 is multiple, and the multiple first through holes 21 are arranged along the third direction X. The third direction X, the second direction Y and the first direction Z are perpendicular to each other. The number of first threaded holes 112d is multiple, and the multiple first threaded holes 112d are arranged along the third direction X. One first threaded hole 112d corresponds to one first through hole 21. The number of first fasteners 41 is multiple, and one first fastener 41 cooperates with one first through hole 21 and one first threaded hole 112d. The arrangement of the multiple first through holes 21, the multiple first threaded holes 112d and the multiple first fasteners 41 facilitates the bracket 20 and the first side wall 112 to have multiple connection positions in the third direction, thereby improving the connection stability of the bracket 20 and the first side wall 112.

[0121] According to some embodiments of the present application, the second battery monomer assembly 32 and the bracket 20 are bonded by glue.

[0122] For example, when the second battery monomer assembly 32 and the bracket 20 are assembled, glue can be arranged on the surface of the bracket 20 away from the bottom wall 111, and the second battery monomer and the bracket 20 are bonded by the glue to realize the assembly of the second battery monomer assembly 32 and the bracket 20. For another example, when the second battery monomer assembly 32 and the bracket 20 are assembled, glue can be arranged on the surface of the second battery monomer assembly 32 facing the bracket 20, and the second battery monomer and the bracket 20 are bonded by the glue to realize the assembly of the second battery monomer assembly 32 and the bracket 20.

[0123] In the above scheme, the second battery monomer assembly 32 and the bracket 20 are bonded by glue, which is simple in process and convenient to operate.

[0124] Referring to FIG. 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 first surface 22a facing away from the bottom wall 111 (see FIG. 3), and the protrusion 23 protrudes from the first surface 22a and is located between the first through hole 21 and the second battery monomer assembly 32 along the second direction Y.

[0125] The bracket body 22 can be a cuboid, and the bracket body 22 is used to carry the second battery monomer assembly 32.

[0126] The first surface 22a is a surface of the bracket body 22 facing away from the bottom wall 111, and the second battery monomer assembly 32 can be arranged on the first surface 22a.

[0127] The protrusion 23 protrudes from the first surface 22a in a direction away from the bottom wall 111, and the protrusion 23 has a certain height in the first direction Z so as to block the gel from moving towards the first through hole 21.

[0128] In some embodiments, the number of protrusions 23 can be two, and the two protrusions 23 are arranged at intervals along the second direction Y, and the second battery monomer assembly 32 is arranged between the two protrusions 23. The two protrusions 23 are arranged one by one corresponding to the two first side walls 112, and in the same projection plane perpendicular to the first direction Z, the orthographic projection of the protrusion 23 is located between the orthographic projection of the first through hole 21 of the corresponding first side wall 112 and the orthographic projection of the second battery monomer assembly along the second direction Y.

[0129] In the above scheme, the protrusion 23 protrudes from the first surface 22a, which can form a block between the first mounting hole and the second monomer assembly, thereby reducing the risk of the gel flowing to the first through hole 21 and affecting the assembly of the first fastener 41 and the first through hole 21.

[0130] Referring to FIG. 3, according to some embodiments of the present application, the distance between the first battery monomer assembly 31 and the first inner surface 112b along the second direction Y is W, which satisfies W≤8mm.

[0131] In the figure, the size indicated by the letter W is the distance between the first battery monomer assembly 31 and the first inner surface 112b in the second direction Y.

[0132] For example, the distance W between the first battery monomer assembly 31 and the first inner surface 112b in the second direction Y can satisfy 3mm≤W≤8mm. W can be any one of 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm or a range between any two of them.

[0133] In the above scheme, the distance between the first battery monomer 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 smaller, more first battery monomer assemblies 31 can be arranged, the space utilization between the two first side walls 112 is improved, and the volume energy density of the battery device 100 is improved.

[0134] Please refer to FIG. 3 to FIG. 5, according to some embodiments of the present application, the first outer surface 112a is provided with a receiving groove 113, which extends to the first end surface 112c along the first direction Z; the second box 12 includes a top wall 121 and two second side walls 122, the top wall 121 is arranged opposite to the bottom wall 111 along the first direction Z, and the two second side walls 122 are arranged spaced apart along the second direction Y, and the top wall 121 connects the two second side walls 122; the second side wall 122 has a connecting end 1221 away from the top wall 121, and the connecting end 1221 is arranged in the receiving groove 113, and the connecting end 1221 is connected with the first side wall 112.

[0135] The receiving groove 113 is a groove opened in the first outer surface 112a, and the receiving groove 113 extends to the first end surface 112c along the first direction Z, so that the connecting end 1221 can extend into the receiving groove 113 along the first direction Z.

[0136] In some embodiments, the first side wall 112 has a second end surface and a third end surface arranged opposite along a third direction X, the second end surface and the third end surface are located at opposite ends of the first side wall 112 in the third direction X, the second end surface connects the first inner surface 112b and the first outer surface 112a, and the third end surface 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, and the receiving groove 113 can extend from the second end surface to the third end surface, so as to facilitate the assembly of the second box 12 and the first side wall 112.

[0137] The top wall 121 and the bottom wall 111 can be located at opposite ends of the box 10 in the first direction Z, one end of the second side wall 122 in the first direction Z is connected with the top wall 121, and the other end of the second side wall 122 in the first direction Z forms the connecting end 1221.

[0138] The top wall 121, the two side walls and the bracket 20 enclose a second receiving space 10b.

[0139] In some embodiments, the connecting end 1221 is arranged in the receiving groove 113, and the connecting end 1221 is connected with the groove wall of the receiving groove 113 in the second direction Y, for example, the connecting end 1221 is connected with the groove wall of the receiving groove 113 along the second direction Y.

[0140] In the above scheme, the connecting end 1221 is arranged in the accommodating groove 113, and the connecting end 1221 is connected with the first side wall 112, so as 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 accommodating groove 113 along the first direction Z, and the operation is simple.

[0141] According to some embodiments of the present application, the material of the first box body can be aluminum, aluminum alloy, steel, stainless steel, etc.; and the material of the second box body can be plastic, aluminum, steel, stainless steel, etc.

[0142] Optionally, the material of the first box body is aluminum alloy.

[0143] Optionally, the material of the second box body is plastic.

[0144] Please refer to FIGS. 3-5. 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.

[0145] The thickness direction of the connecting end 1221 is parallel to the thickness direction of the second side wall 122, and both the thickness direction of the second side wall 122 and the thickness direction of the first side wall 112 are parallel to the second direction Y.

[0146] In the above scheme, 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 high strength after the accommodating groove 113 is arranged, and the connecting reliability between the connecting end 1221 and the first side wall 112 is high.

[0147] According to some embodiments of the present application, the thickness of the second side wall 122 is less than the thickness of the first side wall 112.

[0148] Please refer to FIGS. 3-5. According to some embodiments of the present application, in the direction from the first inner surface 112b to the first outer surface 112a, the connecting end 1221 does not protrude from the first outer surface 112a.

[0149] When the second side wall 122 is assembled with the corresponding first side wall 112, in the direction from the first inner surface 112b to the first outer surface 112a, the connecting end 1221 does not protrude from the first outer surface 112a of the corresponding first side wall 112, so that the connecting end 1221 does not occupy the space on the outer side of the first side wall 112.

[0150] In the above scheme, the connecting end 1221 does not protrude from the first outer surface 112a, so that the structure after the connecting end 1221 is connected with the first side wall 112 occupies a smaller assembly space, and the risk of interference between the connecting end 1221 and other components is reduced.

[0151] Please refer to FIG. 6, which is a sectional view of a partial structure of a battery device according to some embodiments of the present application. According to some embodiments of the present application, the battery device 100 further comprises a first sealing member 51, which is arranged in the accommodating groove 113 and between the connecting end 1221 and the first side wall 112 along the second direction Y.

[0152] The first sealing member 51 can be a sealing gasket or a sealing glue, which has a good sealing effect.

[0153] The phrase "the first sealing member 51 is arranged between the connecting end 1221 and the first side wall 112 along the second direction Y" means that the inner surface of the connecting end 1221 and the groove wall of the accommodating groove 113 are sealingly matched along the second direction Y. The inner surface of the connecting end 1221 can be the surface of the connecting end 1221 facing the inside of the box 10. After the inner surface of the connecting end 1221 and the groove wall of the accommodating groove 113 are sealingly matched along the second direction Y by the first sealing member 51, the sealing between the second box 12 and the first box 11 can be realized only by the first sealing member 51, without the need to additionally arrange other sealing members, thereby reducing the number of parts.

[0154] In the above scheme, the first sealing member 51 is arranged in the accommodating groove 113, and the first sealing member 51 is arranged between the connecting end 1221 and the first side wall 112, so that the connecting end 1221 and the first side wall 112 are sealingly matched, thereby realizing the sealing between the second side wall 122 and the first side wall 112. The first battery monomer assembly 31 and the second battery monomer assembly 32 share the same sealing structure, thereby reducing the number of parts and saving manufacturing costs.

[0155] Please refer to FIG. 6. According to some embodiments of the present application, the connecting end 1221 is provided with a second through hole 1222, the groove wall of the accommodating groove 113 is provided with a second threaded hole 1131 corresponding to the second through hole 1222, and the battery device 100 further comprises a second fastener 42, which passes through the second through hole 1222 and is connected with the second threaded hole 1131, so as to connect the connecting end 1221 to the first side wall 112.

[0156] In some embodiments, the second through hole 1222 is a hole penetrating through the connecting end 1221 along the second direction Y, so as to facilitate the connection of the second fastener 42 with the first side wall 112 after passing through the connecting end 1221.

[0157] The second threaded hole 1131 can be a threaded hole opened on the groove wall of the accommodating groove 113, or the second threaded hole 1131 can be a threaded hole of a threaded sleeve embedded on the groove wall of the accommodating groove 113.

[0158] 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. One end of the threaded section of the second fastener 42 is arranged to pass through the second through hole 1222 and threadedly engage the second threaded hole 1131, so as to improve the connection stability between the connecting end 1221 and the first side wall 112.

[0159] In the above scheme, the arrangement of the second through hole 1222 facilitates the arrangement of the second fastener 42, thereby improving the assembly efficiency. The arrangement of the second threaded hole 1131 facilitates the assembly of the second fastener 42 and the slot wall of the accommodating slot 113. The connecting end 1221 and the first side wall 112 have high connection stability, which facilitates the assembly and disassembly of the connecting end 1221 and the first side wall 112, and facilitates the maintenance and replacement of the first battery monomer assembly 31 or the second battery monomer assembly 32.

[0160] In some embodiments, the number of the second through holes 1222 is multiple. The multiple second through holes 1222 are arranged along the third direction X at intervals. The number of the second threaded holes 1131 is multiple. The multiple second threaded holes 1131 are arranged along the third direction X at intervals. One second threaded hole 1131 corresponds to one second through hole 1222. The number of the second fasteners 42 is multiple. One second fastener 42 cooperates with one second through hole 1222 and one second threaded hole 1131. The arrangement of the multiple second through holes 1222, the multiple second threaded holes 1131, and the multiple second fasteners 42 facilitates the multiple connection positions of the connecting end 1221 and the first side wall 112 in the third direction, thereby improving the connection stability of the connecting end 1221 and the first side wall 112.

[0161] Please refer to FIG. 6. According 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.

[0162] When the second side wall 122 is assembled with the corresponding first side wall 112, 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 of the corresponding first side wall 112, so that the second fastener 42 does not occupy the space on the outer side of the first side wall 112.

[0163] In the above scheme, the second fastener 42 does not protrude from the first outer surface 112a, which reduces the space occupation of 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.

[0164] Referring to FIG. 3, according to some embodiments of the present application, the inner portion of the bottom wall 111 is formed with a first flow channel 1111 for containing a heat exchange medium; the inner portion of the bracket 20 is formed with a second flow channel 24 for containing the heat exchange medium.

[0165] The first flow channel 1111 is a passage formed in the inner portion of the bottom wall 111 and used for the flow of the heat exchange medium. After the battery device 100 is assembled, the first flow channel 1111 can contain the heat exchange medium, so as to exchange heat with the first battery monomer 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 transmitted to the first battery monomer assembly 31 through the bottom wall 111, so as to reduce the temperature of the first battery monomer assembly 31. For another example, when the heat exchange medium is a heating medium, the high temperature of the heat exchange medium is transmitted to the first battery monomer assembly 31 through the bottom wall 111, so as to increase the temperature of the first battery monomer assembly 31.

[0166] In some embodiments, the material of the bottom wall 111 can have good heat conduction performance, so as to exchange heat between the heat exchange medium and the first battery monomer assembly 31.

[0167] The second flow channel 24 is a passage formed in the inner portion of the bracket 20 and used for the flow of the heat exchange medium. After the battery device 100 is assembled, the second flow channel 24 can contain the heat exchange medium, so as to exchange heat with the second battery monomer 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 transmitted to the second battery monomer assembly 32 through the bracket 20, so as to reduce the temperature of the second battery monomer assembly 32. For another example, when the heat exchange medium is a heating medium, the high temperature of the heat exchange medium is transmitted to the second battery monomer assembly 32 through the bracket 20, so as to increase the temperature of the second battery monomer assembly 32.

[0168] In some embodiments, the material of the bracket 20 can have good heat conduction performance, so as to exchange heat between the heat exchange medium and the second battery monomer assembly 32 through the bracket 20.

[0169] Meanwhile, since the bracket 20 is located between the first battery monomer assembly 31 and the second battery monomer assembly 32, the bracket 20 can also adjust the temperature of the first battery monomer assembly 31.

[0170] In some embodiments, the heat exchange medium is a fluid, which can be but is not limited to water, alcohol or other liquid mixtures.

[0171] In the above scheme, the first flow channel 1111 is arranged so as to arrange the heat exchange medium in the first flow channel 1111, facilitate heat exchange with the first battery monomer assembly 31 through the heat exchange medium, and adjust the temperature of the first battery monomer assembly 31; the second flow channel 24 is arranged so as to arrange the heat exchange medium in the second flow channel 24, facilitate heat exchange with the second battery monomer assembly 32 through the heat exchange medium arranged in the second flow channel 24, and adjust the temperature of the second battery monomer assembly 32; meanwhile, since the support 20 is located between the first battery monomer assembly 31 and the second battery monomer assembly 32, the support 20 can also adjust the temperature of the first battery monomer assembly 31.

[0172] Please refer to FIG. 3 and FIG. 4, according to some embodiments of the present application, the inside of the first side wall 112 is formed with a cavity 1121.

[0173] The first side wall 112 can be processed by extrusion molding.

[0174] The inside of the first side wall 112 can be formed with a reinforcing rib so that the first side wall 112 has higher strength.

[0175] In the above scheme, the first side wall 112 is a hollow structure, and the first side wall 112 has lighter weight, which facilitates reducing the weight of the box body 10 and the overall weight of the battery device 100.

[0176] Please refer to FIG. 2, and further refer to FIG. 7, which is a partial structure schematic diagram of a battery device according to some embodiments of the present application. According to some embodiments of the present application, the second box body 12 is formed with openings 123 at both ends along a third direction X, the third direction X, the second direction Y and the first direction Z are perpendicular to each other; the box body 10 further comprises two third side walls 13 arranged oppositely along the third direction X, and the first battery monomer assembly 31 and the second battery monomer assembly 32 are arranged between the two third side walls 13; along the direction of the bottom wall 111 pointing to the first battery monomer assembly 31, the third side wall 13 protrudes from the first side wall 112, and the two third side walls 13 respectively close the two openings 123.

[0177] When the first direction Z is the height direction of the battery device 100 and the second direction Y is the width direction of the battery device 100, the third direction X can be the length direction of the battery device 100.

[0178] In some embodiments, the top wall 121 and the two second side walls 122 enclose the opening 123 at the end in the third direction X.

[0179] 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 explosion-proof valves, water cooling connectors or high and low voltage connectors and other components so as to facilitate the normal charging and discharging work of the battery device 100.

[0180] The opening 123 formed at each end of the second case 12 along the third direction X can be a notched portion corresponding to the third side wall 13, and the third side wall 13 can correspondingly close the opening 123. In some embodiments, the cross-sectional shape of the second case 12 can be U-shaped.

[0181] In the above scheme, by arranging the third side wall 13, on the one hand, components such as explosion-proof valves, water-cooled connectors, or high-low voltage connectors can be installed on the third side wall 13, facilitating normal charging and discharging of the battery device 100; on the other hand, by closing the opening 123 with the third side wall 13, the space utilization of the battery device 100 in the third direction X can be improved, and the volumetric energy density of the battery device 100 can be improved.

[0182] Please refer to FIG. 2 and FIG. 7, according to some embodiments of the present application, the third side wall 13 has a second inner surface 131 facing the second battery monomer assembly 32, a second outer surface 132 facing away from the second battery monomer assembly 32, and a first side surface 133 connecting the second inner surface 131 and the second outer surface 132, and the second case 12 includes two connecting portions 124, which are respectively located at the two ends of the second case 12 along the third direction X, the connecting portion 124 surrounds the opening 123, and the connecting portion 124 is connected to the first side surface 133.

[0183] The second inner surface 131 and the second outer surface 132 are oppositely arranged along the thickness direction of the third side wall 13, and the thickness direction of the third side wall 13 is parallel to the third direction X. The first side surface 133 can be the outer peripheral surface of the third side wall 13 between the second inner surface 131 and the second outer surface 132. The outer peripheral surface of the third side wall 13 can be the outer surface of the third side wall 13 in the first direction Z and the second direction Y.

[0184] The connecting portion 124 is a portion at the end of the second case 12 in the third direction X, which surrounds the opening 123 of the second case 12, and the profile of the connecting portion 124 fits the first side surface 133 of the third side wall 13.

[0185] The connecting portion 124 can be in the form of a sheet, which cooperates with the first side surface 133. In some embodiments, the connecting relationship between the connecting portion 124 and the first side surface 133 is a surface-to-surface connection.

[0186] In the above scheme, by connecting the connecting portion 124 with the first side surface 133 of the third side wall 13, the connection stability and sealing performance of the second case 12 and the third side wall 13 can be improved.

[0187] Please refer to FIG. 2 and FIG. 3, according to some embodiments of the present application, the third side wall 13 can include a first portion 134 and a second portion 135 connected to each other, the first portion 134 and the second portion 135 are distributed along the first direction Z, the first portion 134 is connected with the bottom wall 111 and the two first side walls 112, the bottom wall 111, the two first side walls 112, the first portion 134 of the two third side walls 13, and the bracket 20 enclose the first containing space 10a; the second portion 135 is connected with the top wall 121 and the two second side walls 122, the bracket 20, the top wall 121, the two second side walls 122, and the second portion 135 of the two third side walls 13 enclose the second containing space 10b.

[0188] Please refer to FIG. 2 and FIG. 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 one end of the third side wall 13 away from the bottom wall 111, the two second flat surfaces 133b are respectively arranged at two ends of the third side wall 13 along the second direction Y, and the transition surface 133c connects the first flat surface 133a and the second flat surface 133b to make the first flat surface 133a and the second flat surface 133b smoothly transition.

[0189] The first flat surface 133a can be an upper surface of the third side wall 13, which can be a flat surface. The second flat surface 133b can be an outer side surface of the third side wall 13, which can be a flat surface. In some embodiments, the first flat surface 133a and the second flat surface 133b are perpendicular to each other. The transition surface 133c is a part connecting the first flat surface 133a and the second flat surface 133b, which can make the first flat surface 133a and the second flat surface 133b smoothly transition. The smoothly transition means that the first flat surface 133a and the second flat surface 133b are in a non-right angle transition relationship.

[0190] In some embodiments, the transition surface 133c can be an arc surface or an inclined surface.

[0191] The first flat surface 133a and the second flat surface 133b are non-parallel surfaces, and therefore, by arranging the transition surface 133c to make the first flat surface 133a and the second flat surface 133b smoothly transition, a good sealing surface can be formed between the connecting portion 124 and the first side surface 133, which facilitates to improve the sealing performance of the battery device 100.

[0192] In some embodiments, the first portion 134 and the second portion 135 can be a split structure, which facilitates to realize the assembly of the first box body 11 and the second box body 12 with the third side wall 13 respectively. In another embodiment, the first portion 134 and the second portion 135 are integrally formed, which facilitates the processing and manufacturing.

[0193] Please refer to FIG. 7, and further refer to FIG. 8, which is an assembly diagram of the connecting part and the third side wall according to some embodiments of the present application. According to some embodiments of the present application, the connecting part 124 is provided with a third through hole 1241, the first side surface 133 is provided with a third threaded hole 1331, and the battery device 100 further comprises a third fastener 43, which passes through the third through hole 1241 and is connected with the third threaded hole 1331, so as to connect the connecting part 124 with the third side wall 13.

[0194] The third through hole 1241 is a hole penetrating through the connecting part 124 along the first direction Z, so as to facilitate the connection of the third fastener 43 with the third side wall 13 after passing through the connecting part 124.

[0195] The third threaded hole 1331 can be a threaded hole opened on the first side surface 133, or the third threaded hole 1331 can be a threaded hole of a threaded sleeve embedded on the first side surface 133.

[0196] The third fastener 43 can be a bolt or a fastener with a threaded section, which is arranged along the first direction Z. One end of the threaded section of the third fastener 43 passes through the third through hole 1241 and is screwed with the third threaded hole 1331, so as to improve the connection stability of the connecting part 124 with the third side wall 13.

[0197] In the above scheme, the third through hole 1241 is arranged to facilitate the passing of the third fastener 43, so as to improve the assembly efficiency. The third threaded hole 1331 is arranged to facilitate the assembly of the third fastener 43 with the first side surface 133, and the connecting part 124 and the third side wall 13 have high connection stability, which is beneficial to the assembly and disassembly of the connecting part 124 and the third side wall 13.

[0198] In some embodiments, the number of third threaded holes 1331 is multiple, and the multiple third threaded holes 1331 are arranged along the circumference of the third side wall 13. The number of third through holes 1241 is multiple, and one third threaded hole 1331 corresponds to one third through hole 1241. The number of third fasteners 43 is multiple, and one third fastener 43 cooperates with one third through hole 1241 and one third threaded hole 1331. The arrangement of the multiple third through holes 1241, the multiple third threaded holes 1331 and the multiple third fasteners 43 facilitates the improvement of the connection stability of the connecting part 124 with the third side wall 13.

[0199] Please refer to FIG. 7 and FIG. 8. According to some embodiments of the present application, the battery device 100 further comprises a second sealing member 52 arranged between the connecting part 124 and the first side surface 133.

[0200] The second seal 52 can be a component with sealing properties and arranged between the connecting portion 124 and the first side surface 133. In some embodiments, the second seal 52 can be a sealant or a gasket, and the second seal 52 is clamped between the first side surface 133 and the connecting portion 124. For example, the second seal 52 is clamped 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.

[0201] In the above scheme, by arranging the second seal 52 between the connecting portion 124 and the first side surface 133, the sealing property between the connecting portion 124 and the first side surface 133 can be improved, and thus the sealing property of the battery device 100 can be improved.

[0202] In some embodiments, the first seal 51 and the second seal 52 can be independent structures, and the first seal 51 and the second seal 52 are connected by adhesion or an intermediate connecting member.

[0203] In some embodiments, the first seal 51 and the second seal 52 can be an integrated structure. For example, the first seal 51 and the second seal 52 can be integrally formed.

[0204] According to some embodiments of the present application, the embodiments of the present application further provide a power consumption device, which comprises the battery device 100 provided according to any of the above embodiments, and the battery device 100 is used to provide electric energy.

[0205] The power consumption device can be a device or a system in which the application battery device 100 is used as a power supply.

[0206] According to some embodiments of the present application, please refer to FIGS. 2 to 8, the embodiments of the present application provide a battery device 100, which comprises a box body 10, a support 20, a first battery monomer assembly 31, a second battery monomer assembly 32, a first fastener 41, a second fastener 42, and a first seal 51.

[0207] The box body 10 comprises a first box body 11 and a second box body 12, and the first box body 11 and the second box body 12 are oppositely arranged along a first direction Z and are buckled.

[0208] The first box body 11 includes a bottom wall 111 and two first side walls 112 oppositely arranged along the second direction Y, the bottom wall 111 supports the first battery monomer assembly 31, the bottom wall 111 is connected with the two first side walls 112, the bottom wall 111 supports the first battery monomer assembly 31, the first side wall 112 has a first outer surface 112a and a first inner surface 112b oppositely arranged along the thickness direction thereof, and a first end surface 112c 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, which extends to the first end surface 112c along the first direction Z and penetrates through both ends of the first side wall 112 along the third direction X.

[0209] The bracket 20 is arranged in the box body 10, the first box body 11 and the bracket 20 form a first receiving space 10a, the second box body 12 and the bracket 20 form a second receiving space 10b, the first battery monomer assembly 31 is arranged in the first receiving space 10a, and the second battery monomer assembly 32 is arranged in the second receiving space 10b. Along the second direction Y, the distance between the first battery monomer assembly 31 and the first inner surface 112b is W, which satisfies W≤8mm.

[0210] The bracket 20 is located on the side of the first side wall 112 away from the bottom wall 111, the bracket 20 is connected to the first end surface 112c, and the bracket 20 supports the second battery monomer 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, and the first fastener 41 penetrates through the first through hole 21 and is connected with the first threaded hole 112d, so as to connect the bracket 20 to the first side wall 112.

[0211] The second box body 12 includes a top wall 121 and two second side walls 122, the top wall 121 is oppositely arranged with the bottom wall 111 along the first direction Z, the two second side walls 122 are spaced apart along the second direction Y, and the top wall 121 is connected with 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, the first sealing member 51 is arranged in the receiving groove 113, and along the second direction Y, the first sealing member 51 is arranged between the connecting end 1221 and the first side wall 112. The connecting end 1221 is provided with a second through hole 1222, the groove wall of the receiving groove 113 is provided with a second threaded hole 1131 corresponding to the second through hole 1222, and the battery device 100 further includes a second fastener 42, the second fastener 42 penetrates through the second through hole 1222 and is connected with the second threaded hole 1131, so as to connect the connecting end 1221 to the first side wall 112.

[0212] According to the battery device 100 provided by the embodiment of the present application, the support 20 is located on the side of the first side wall 112 away from the bottom wall 111, and the support 20 is connected to the first end face 112c. No structure for connecting the support 20 needs to be arranged on the first inner surface 112b of the first side wall 112, and the first battery monomer assembly 31 can be arranged close to the first inner surface 112b, so that the distance between the first battery monomer assembly 31 and the first inner surface 112b of the first side wall 112 can be small, for example, the distance between the first battery monomer assembly 31 and the first inner surface 112b in the second direction Y is W≤8mm. More first battery monomer assemblies 31 can be arranged in the box body 10, so as to improve the space utilization rate between the two first side walls 112, thereby improving the volume energy density of the battery device 100. After the first fastener 41 passes through the first through hole 21 and is connected to the first threaded hole 112d, the first fastener 41 is assembled with the first end face 112c, the support 20 has high connection stability with the first side wall 112, which is beneficial to the assembly and disassembly of the support 20 and the first side wall 112, and is beneficial to the maintenance and replacement of the first battery monomer assembly 31 or the second battery monomer assembly 32. After the inner surface of the connecting end 1221 and the groove wall of the accommodating groove 113 are sealed and matched in the second direction Y by the first sealing element 51, the sealing between the second box body 12 and the first box body 11 can be realized only by the first sealing element 51, without the need for additional sealing elements, thereby reducing parts and saving manufacturing costs. After the second fastener 42 passes through the second through hole 1222 and is connected to the second threaded hole 1131, the second fastener 42 is assembled with the groove wall of the accommodating groove 113, the connecting end 1221 has high connection stability with the first side wall 112, which is beneficial to the assembly and disassembly of the connecting end 1221 and the first side wall 112, and is beneficial to the maintenance and replacement of the first battery monomer assembly 31 or the second battery monomer assembly 32.

[0213] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to the present application without departing from the scope of the present application, and equivalent components can be substituted therefor. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, comprising: a box including a first box and a second box, the first box and the second box oppositely arranged along a first direction, the first box and the second box being fastened together; a support arranged in the box, the first box and the support enclosing a first accommodating space, the second box and the support enclosing a second accommodating space; a first battery cell assembly arranged in the first accommodating space, and a second battery cell assembly arranged in the second accommodating space; wherein the first box includes a bottom wall and two first side walls oppositely arranged along a second direction, the bottom wall supporting the first battery cell assembly, the bottom wall connecting the two first side walls, the first side wall having a first outer surface and a first inner surface oppositely arranged along a thickness direction of the first side wall, and a first end surface facing away from the bottom wall, the first end surface being located between the first outer surface and the first inner surface, the support being connected to the first end surface, the support supporting the second battery cell assembly, the second direction being perpendicular to the first direction.

2. The battery device of claim 1, wherein, The support 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 further comprises a first fastener, the first fastener passing through the first through hole and being connected with the first threaded hole to connect the support to the first side wall.

3. The battery device of claim 2, wherein, The second battery cell assembly is adhesively bonded to the support.

4. The battery device of claim 3, wherein, The support includes a support body and a protruding portion, the support body carrying the second battery cell assembly, the support body having a first surface facing away from the bottom wall, and the protruding portion protruding from the first surface, the protruding portion being located between the first through hole and the second battery cell assembly along the second direction.

5. The battery device according to any one of claims 1-4, wherein, The distance between the first battery cell assembly and the first inner surface along the second direction is W, and W≤8mm is satisfied.

6. The battery device according to any one of claims 1-5, wherein, The first outer surface is provided with an accommodating groove, the accommodating groove extending to the first end surface along the first direction. The second box includes a top wall and two second side walls, the top wall and the bottom wall oppositely arranged along the first direction, the two second side walls being spaced apart along the second direction, and the top wall connecting the two second side walls. The second side wall has a connecting end facing away from the top wall, the connecting end being arranged in the accommodating groove, and the connecting end being connected to the first side wall.

7. The battery device of claim 6, wherein, The thickness of the connecting end is less than the thickness of the first side wall.

8. The battery device of claim 7, wherein, The connecting end does not protrude from the first outer surface along a direction in which the first inner surface points to the first outer surface.

9. The battery device of any one of claims 6-8, wherein, The battery device further comprises a first sealing member arranged in the accommodating groove, the first sealing member being arranged between the connecting end and the first side wall along the second direction.

10. The battery device of claim 9, wherein, The connecting end is provided with a second through hole, a groove wall of the accommodating groove is provided with a second threaded hole corresponding to the second through hole, and the battery device further comprises a second fastener, the second fastener passes through the second through hole and is connected with the second threaded hole, so as to connect the connecting end to the first side wall.

11. The battery device of claim 10, wherein, In a direction of the first inner surface pointing to the first outer surface, the second fastener does not protrude from the first outer surface.

12. The battery device of any one of claims 1-11, wherein, The bottom wall is internally formed with a first flow channel for accommodating heat exchange medium. The bracket is internally formed with a second flow channel for accommodating heat exchange medium.

13. The battery device of any one of claims 1-12, wherein, The first side wall is internally formed with a cavity.

14. The battery device of any one of claims 1-13, wherein, The second box body is formed with openings at two ends thereof along a third direction, the third direction, the second direction and the first direction are perpendicular to each other; The box body further comprises two third side walls oppositely arranged along the third direction, and the first battery monomer assembly and the second battery monomer assembly are arranged between the two third side walls. In a direction of the bottom wall pointing to 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 of claim 14, wherein, The third side wall has a second inner surface facing the second battery monomer assembly, a second outer surface away from the second battery monomer assembly, and a first side surface connecting the second inner surface and the second outer surface, the second box body comprises two connecting portions, the two connecting portions are respectively located at two ends of the second box body along the third direction, the connecting portions enclose the openings, and the connecting portions are connected to the first side surface.

16. The battery device of claim 15, wherein, The connecting portion is provided with a third through hole, the first side surface is provided with a third threaded hole, and the battery device further comprises a third fastener, the third fastener passes through the third through hole and is connected with the third threaded hole, so as to connect the connecting portion to the third side wall.

17. The battery device of claim 15 or 16, wherein, The battery device further comprises a second sealing member arranged between the connecting portion and the first side surface.

18. An electric device comprising the battery device according to any one of claims 1-17, wherein the battery device is used to provide electric energy.

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