Battery device and electric device

Abstract

The embodiment of the utility model provides a battery device and a power utilization device. The battery device comprises a box body and a plurality of battery cell assemblies. The plurality of battery monomer assemblies are accommodated in the box body and are arranged along a first direction; wherein the box body comprises a supporting wall, the supporting wall is located between two adjacent battery monomer assemblies and supports at least one battery monomer assembly, the supporting wall and a wall body, in the second direction, of the box body are integrally formed, and the first direction is perpendicular to the second direction. According to the technical scheme, the energy density of the battery device can be improved.

Description

Technical Field

[0001] This application relates to the field of battery device technology, and more specifically, to a battery device and an electrical device. Background Art

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

[0003] Energy density is a crucial factor in the manufacturing process of battery devices. Therefore, improving the energy density of battery devices is a pressing technical challenge that needs to be addressed. Utility Model Content

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

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

[0006] In a first aspect, embodiments of this application provide a battery device, which includes a housing and a plurality of battery cell assemblies. The plurality of battery cell assemblies are housed within the housing and are arranged along a first direction. The housing includes a support wall located between two adjacent battery cell assemblies and supporting at least one battery cell assembly. The support wall is integrally formed with a wall of the housing in a second direction, the first direction being perpendicular to the second direction.

[0007] According to the battery device of the present application embodiment, the support wall and the wall of the housing in the second direction are integrally formed. The overall strength of the structure formed by the support wall and the wall of the housing in the second direction is high, and the connection reliability between the support wall and the wall of the housing is high. This is conducive to setting multiple battery cell components in the first direction of the battery device. At the same time, the inner surface of the wall of the housing in the second direction does not need to be provided with additional support structure to cooperate with the support wall, which can improve the space utilization rate inside the housing in the second direction and facilitate the improvement of the energy density of the battery device.

[0008] According to some embodiments of this application, a first flow channel is formed inside the support wall, the first flow channel being used to contain the heat exchange medium.

[0009] In the above scheme, the first flow channel is set up to facilitate heat exchange between the heat exchange medium contained in the first flow channel and the battery cell assembly supported by the support wall, which facilitates the adjustment of the temperature of the battery cell assembly and helps to improve the cycle performance of the battery cell assembly.

[0010] According to some embodiments of this application, the housing includes a first sub-housing, the first sub-housing includes a support wall and two first side walls, the two first side walls are arranged opposite each other along a second direction, the support wall connects the two first side walls, and the support wall is integrally formed with the first side walls; one of two adjacent battery cell assemblies is supported by the support wall, and the other is located between the two first side walls.

[0011] In the above scheme, along the first direction, one of two adjacent battery cell modules is supported by a support wall, which is integrally formed with the two first sidewalls. The structure formed by the support wall and the two first sidewalls can provide a good support effect for the battery cell module, which can improve the reliability of the battery device. At the same time, the other of the two adjacent battery cell modules is located between the two first sidewalls, and the support wall is integrally formed with the two first sidewalls. There is no need to set an additional support structure on the inner surface of the first sidewalls, which can improve the utilization rate of the space enclosed by the support wall and the two first sidewalls in the second direction, which is conducive to improving the energy density of the battery device.

[0012] According to some embodiments of this application, the support wall and the two first sidewalls are integrally extruded.

[0013] In the above scheme, the support wall and the two first side walls are integrally extruded, which is convenient for processing and manufacturing, and the structure formed by the support wall and the two first side walls has high overall strength.

[0014] According to some embodiments of this application, the first sub-box further includes two second sidewalls, which are arranged opposite each other along a third direction. A support wall connects the two second sidewalls, and the second sidewalls connect the two first sidewalls. Another of the two adjacent battery cell assemblies is located between the two second sidewalls. The third direction, the second direction, and the first direction are perpendicular to each other.

[0015] In the above scheme, two second sidewalls are arranged opposite each other in a third direction, and a battery cell assembly is disposed between the two second sidewalls. The two second sidewalls can form a protective barrier for the battery cell assembly in a third direction, reducing the risk of damage to the battery cell assembly located between the two second sidewalls.

[0016] According to some embodiments of this application, the housing further includes a second sub-housing body and a third sub-housing body. The second sub-housing body is connected to the first sub-housing body and together with the first sub-housing body forms a first receiving cavity. The third sub-housing body is connected to the first sub-housing body and together with the first sub-housing body forms a second receiving cavity. Each of the first receiving cavity and the second receiving cavity contains a battery cell assembly. The battery cell assembly in the first receiving cavity is supported by the second sub-housing body, and the battery cell assembly in the second receiving cavity is supported by a support wall.

[0017] In the above scheme, the second sub-box and the third sub-box are distributed on both sides of the first sub-box along the first direction. The second sub-box and the first sub-box form a first receiving cavity, and the third sub-box and the first sub-box form a second receiving cavity. The first receiving cavity and the second receiving cavity respectively accommodate two adjacent battery cell components along the first direction, so as to realize the arrangement of multiple battery cell components in the first direction.

[0018] According to some embodiments of this application, along a first direction, a plurality of first sub-boxes are stacked between the second sub-boxes and the third sub-boxes, and two adjacent first sub-boxes are connected to each other to form a third receiving cavity. Each third receiving cavity contains a battery cell assembly, and the battery cell assembly in the third receiving cavity is supported by a support wall.

[0019] In the above scheme, multiple first sub-boxes are stacked along a first direction, and two adjacent first sub-boxes form a third receiving cavity. Each third receiving cavity accommodates one battery cell assembly. The multiple first sub-boxes cooperate with the second and third sub-boxes to accommodate multiple battery cell assemblies in the first direction, facilitating the assembly of multiple battery cells in the first direction and improving the energy density of the battery device. During battery device assembly, the assembly of multiple battery cell assemblies with the support walls of the multiple first sub-boxes can be performed simultaneously, and then the multiple first sub-boxes equipped with battery cell assemblies are stacked, which can reduce assembly time and improve the assembly efficiency of the battery device.

[0020] According to some embodiments of this application, a second flow channel is formed inside the wall of the second sub-box, and the second flow channel is used to contain the heat exchange medium.

[0021] In the above scheme, the setting of the second flow channel facilitates heat exchange between the heat exchange medium contained in the second flow channel and the battery cell assembly carried by the second sub-box, so as to regulate the temperature of the battery cell assembly and improve the cycle performance of the battery cell assembly.

[0022] According to some embodiments of this application, along a first direction, a first opening is formed on the side of the first sub-box away from the third sub-box, and the second sub-box covers the first opening.

[0023] In the above scheme, the second sub-box covers the first opening, which facilitates the sealing and cooperation between the second box and the first sub-box, and closes the first opening to improve the sealing effect of the first receiving cavity.

[0024] According to some embodiments of this application, the second sub-box is integrally extruded.

[0025] In the above scheme, the second sub-box is integrally extruded and has high strength, which facilitates the provision of better support for the battery cell assembly.

[0026] According to some embodiments of this application, the third sub-box is a one-piece molded structure.

[0027] In the above scheme, the third sub-box is a one-piece molded structure with high overall strength.

[0028] According to some embodiments of this application, a second opening is formed on the side of the third sub-box facing the first sub-box, and the support wall closes the second opening.

[0029] In the above scheme, the second opening of the third sub-box is oriented towards the support wall to facilitate the assembly of the third sub-box with the support wall and improve the sealing effect of the second receiving cavity.

[0030] According to some embodiments of this application, the thickness of the wall of the third sub-box is less than the thickness of the supporting wall.

[0031] In the above scheme, the battery cell assembly housed in the second housing cavity is supported by the support wall. The strength of the third sub-box can be less than that of the first sub-box. Therefore, the thickness of the wall of the third sub-box can be designed to be less than the thickness of the support wall. For example, the material of the third sub-box can be a material with lower strength, or the amount of material used in the wall of the third sub-box can be less than that used in the wall of the first sub-box, so as to save materials and reduce manufacturing costs.

[0032] According to some embodiments of this application, the wall thickness of the third sub-box is H, which satisfies 0.3mm≤H≤5mm.

[0033] In the above scheme, the wall thickness of the third sub-box satisfies the above relationship. While ensuring that the third sub-box has a certain strength, the wall thickness of the third sub-box is small, and the material used in the third sub-box is less, which helps to reduce manufacturing costs.

[0034] According to some embodiments of this application, the third sub-box is a plastic part or a sheet metal part.

[0035] In the above solutions, plastic or sheet metal parts are easy to process and manufacture, and the manufacturing cost is relatively low.

[0036] According to some embodiments of this application, the first sub-box is made of aluminum alloy.

[0037] In the above scheme, the first sub-box is made of aluminum alloy. The first sub-box can have high strength, corrosion resistance and good thermal conductivity. At the same time, aluminum alloy has high ductility and machinability, which facilitates the processing and manufacturing of the first sub-box.

[0038] Secondly, embodiments of this application also provide an electrical device, which includes a battery device provided according to any of the above embodiments.

[0039] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0040] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0042] Figure 2 This is an exploded view of the structure of a battery device provided in some embodiments of this application;

[0043] Figure 3 Cross-sectional views of a battery device provided for some embodiments of this application;

[0044] Figure 4 This is a schematic diagram of the structure of the first sub-box provided in some embodiments of this application;

[0045] Figure 5 This is a schematic diagram of the structure of the second sub-box provided in some embodiments of this application;

[0046] Figure 6 This is a schematic diagram of the structure of the third sub-box provided in some embodiments of this application;

[0047] Figure 7 This is an exploded view of the structure of a battery device provided in other embodiments of this application;

[0048] Figure 8 Cross-sectional views of a battery device provided in other embodiments of this application;

[0049] Figure 9 for Figure 8 A magnified view of part A.

[0050] Icons: 100-Battery assembly; 10-Box; 10a-Wall; 11-First sub-box; 11a-First end sub-box; 11b-Second end sub-box; 111-Support wall; 112-First side wall; 112a-Hollowed portion; 112b-First through hole; 113-Second side wall; 114-First flow channel; 115-Second threaded hole; 116-First opening; 12-Second sub-box; 121-First threaded hole; 122-Second flow channel; 123-Recess; 13-Third sub-box; 131-Second through hole; 132-Second opening; 14-First receiving cavity; 15-Second receiving cavity; 16-Third receiving cavity; 20-Battery cell assembly; 200-Controller; 300-Motor; 1000-Vehicle; X-Third direction; Y-Second direction; Z-First direction. DETAILED DESCRIPTION

[0051] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0052] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having" and any variations thereof in the description, claims and foregoing drawings of this application are intended to cover non-exclusive inclusion.

[0053] The terms "first," "second," etc., in the specification, claims, or the accompanying drawings of this application are used to distinguish different objects, rather than to describe a specific order or primary / secondary relationship.

[0054] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0055] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0056] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0057] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0058] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0059] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0060] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0061] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0062] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0063] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0064] In some embodiments, the energy storage device includes an energy storage enclosure and a battery unit, with a door on at least one side of the energy storage enclosure. The energy storage device may be, but is not limited to, an energy storage container, an energy storage cabinet, etc.

[0065] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0066] The battery cells may be, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, and the like.

[0067] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0068] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0069] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0070] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be made of stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium with a silver-plated surface. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0071] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used.

[0072] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0073] As an example, the negative electrode current collector may be a metal foil or a composite current collector. For example, the metal foil may be silver-plated aluminum, silver-plated stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium.

[0074] In some embodiments, the negative electrode current collector has two opposite surfaces in its thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0075] As an example, the negative electrode active material may be a negative electrode active material for a battery that is well known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0076] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0077] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0078] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0079] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0080] In some implementations, the electrode assembly is a stacked structure.

[0081] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0082] In some embodiments, the housing includes an end cap and a casing, the casing having an opening, and the end cap closing the opening to form a sealed space for accommodating substances such as electrode assemblies and electrolytes. The casing may have one or more openings. The end cap may also be provided one or more times.

[0083] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab or indirectly connected to the tab via an adapter. The electrode terminal can be located on the end cap or on the housing.

[0084] In some implementations, an explosion-proof valve is provided on the housing. The explosion-proof valve is used to release the internal pressure of the battery cells.

[0085] In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a sealed structure, it protects the electrode assembly and prevents leaks such as electrolyte leakage. When the housing is a non-sealed structure, it protects the electrode assembly, and a sealing bag may be included between the housing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag can be a bag-shaped insulating material or an aluminum-plastic film.

[0086] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0087] The development of battery device technology must take into account multiple design factors, such as reliability, discharge capacity, charge / discharge rate and other performance parameters. In addition, the energy density of the battery device also needs to be considered.

[0088] In some embodiments, the battery device includes two battery cell assemblies arranged along a first direction, forming a two-layer battery cell assembly. Typically, the lower battery cell assembly is supported by the bottom wall of the housing, and the upper battery cell assembly is supported by a support wall. During assembly, the lower battery cell assembly is first assembled to the bottom wall, and then the upper battery cell assembly and support wall are placed on top of the lower battery cell assembly. The support wall is connected to two walls of the housing in a second direction. To ensure the stability of the connection between the support wall and the two walls, a support platform is typically provided on the inner surface of the two walls, and the support wall is connected to the support platform. However, the connection stability between the support platform and the support wall is limited, which is not conducive to assembling more layers of battery cell assemblies. Furthermore, the support platform occupies space inside the housing in the second direction, affecting the energy density of the battery device.

[0089] In view of this, to address the problem that the strength of the housing cannot support multiple layers of battery cells, thus affecting the energy density of the battery device, this application provides a battery device including a housing and multiple battery cells. The multiple battery cells are housed within the housing and arranged along a first direction. The housing includes a support wall located between adjacent battery cells and supporting at least one battery cell. The support wall is integrally formed with the housing wall along a second direction, with the first direction perpendicular to the second direction. This battery device can accommodate a larger number of battery cells, facilitating an increase in the energy density of the battery device.

[0090] In such a battery device, the support wall and the casing wall in the second direction are integrally formed. The overall strength of the structure formed by the support wall and the casing wall in the second direction is high, and the connection reliability between the support wall and the casing wall is high. This is conducive to setting multiple battery cell components in the first direction. At the same time, the inner surface of the casing wall in the second direction does not need to be provided with additional support structure to cooperate with the support wall, which can improve the space utilization rate inside the casing in the second direction and facilitate the improvement of the energy density of the battery device.

[0091] The battery device disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using the battery device disclosed in this application.

[0092] The technical solutions described in the embodiments of this application are applicable to various power devices that use battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0093] The battery device disclosed in this application can be used, but is not limited to, as an energy storage device, for storing or providing electrical energy.

[0094] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0095] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 1000.

[0096] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0097] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0098] Please refer to Figure 2 and Figure 3 , Figure 2 This is an exploded view of the structure of a battery device provided in some embodiments of this application. Figure 3 This is a cross-sectional view of a battery device provided in some embodiments of this application. Embodiments of this application provide a battery device 100, which includes a housing 10 and a plurality of battery cell assemblies 20. The plurality of battery cell assemblies 20 are housed within the housing 10 and are arranged along a first direction Z. The housing 10 includes a support wall 111 located between two adjacent battery cell assemblies 20 and supporting at least one battery cell assembly 20. The support wall 111 is integrally formed with a wall 10a of the housing 10 in a second direction Y, where the first direction Z is perpendicular to the second direction Y.

[0099] In the diagram, the direction indicated by the letter Z can be the first direction, and the direction indicated by the letter Y can be the second direction.

[0100] Along the first direction Z, multiple battery cell modules 20 can be arranged in multiple layers. The first direction Z can be parallel to the direction of gravity, and the first direction Z can be parallel to the height direction of the battery device 100. The second direction Y can be parallel to the width direction of the battery device 100.

[0101] The housing 10 is used to provide a space for housing the battery cell assembly 20, and the walls of the housing 10 form a space for housing the battery cell assembly 20.

[0102] Each battery cell assembly 20 may include multiple battery cells, which may be connected in series, parallel, or a combination thereof. A combination thereof means that some of the battery cells are connected in series and others in parallel. The battery cell assembly 20 may also include other structures, such as a busbar for electrical connection between the multiple battery cells.

[0103] The support wall 111 is a portion of the housing 10 used to support the battery cell assembly 20. Along the first direction Z, the support wall 111 is located between two adjacent battery cell assemblies 20, and the support wall 111 and the other walls of the housing 10 form a receiving space for accommodating the battery cell assembly 20. The thickness direction of the support wall 111 may be parallel to the first direction Z.

[0104] The support wall 111 and the wall 10a of the box 10 in the second direction Y can be cast, extruded, etc., to improve the overall strength of the structure formed by the support wall 111 and the wall 10a of the box 10 in the second direction Y.

[0105] According to the battery device 100 of this application embodiment, the support wall 111 and the wall 10a of the housing 10 in the second direction Y are integrally formed. The overall strength of the structure formed by the support wall 111 and the wall 10a of the housing 10 in the second direction Y is high, and the connection reliability between the support wall 111 and the wall 10a of the housing 10 in the second direction Y is high. This is beneficial for the battery device 100 to set multiple battery cell assemblies 20 in the first direction Z. At the same time, the inner surface of the wall 10a of the housing 10 in the second direction Y does not need to be provided with an additional support structure to cooperate with the support wall 111, which can improve the space utilization rate inside the housing 10 in the second direction Y and facilitate the improvement of the energy density of the battery device 100.

[0106] Please refer to Figure 3 According to some embodiments of this application, a first flow channel 114 is formed inside the support wall 111, the first flow channel 114 being used to contain the heat exchange medium.

[0107] The first flow channel 114 is formed inside the support wall 111 and serves as a channel for the flow of the heat exchange medium. After the battery device 100 is assembled, the first flow channel 114 can contain the heat exchange medium to facilitate heat exchange with the battery cell assembly 20 through the support wall 111. For example, when the heat exchange medium is a cooling medium, the low temperature of the heat exchange medium is transferred to the battery cell assembly 20 through the support wall 111, thereby reducing the temperature of the battery cell assembly 20. Alternatively, when the heat exchange medium is a heating medium, the high temperature of the heat exchange medium is transferred to the battery cell assembly 20 through the support wall 111, thereby increasing the temperature of the battery cell assembly 20.

[0108] In some embodiments, the material of the support wall 111 may have good thermal conductivity so that the heat exchange medium can exchange heat with the battery cell assembly 20 supported by the support wall 111.

[0109] In the above scheme, the first flow channel 114 is set so that the heat exchange medium contained in the first flow channel 114 can exchange heat with the battery cell assembly 20 supported by the support wall 111, which facilitates the adjustment of the temperature of the battery cell assembly 20 and helps to improve the cycle performance of the battery cell assembly 20.

[0110] In some embodiments, the support wall 111 is a hollow structure, and a first reinforcing rib is formed inside the support wall 111 to improve the overall strength of the support wall 111.

[0111] Please refer to Figure 2 and Figure 3 According to some embodiments of this application, the housing 10 includes a first sub-housing 11, the first sub-housing 11 includes a support wall 111 and two first side walls 112, the two first side walls 112 are arranged opposite each other along the second direction Y, the support wall 111 connects the two first side walls 112, and the support wall 111 and the first side walls 112 are integrally formed; one of two adjacent battery cell assemblies 20 is supported by the support wall 111, and the other is located between the two first side walls 112.

[0112] The first sub-box 11 is a structure formed by part of the wall of the box 10, and the first sub-box 11 can provide a space for the battery cell assembly 20.

[0113] The two first sidewalls 112 are parallel to each other, and one end of each first sidewall 112 in the first direction Z is integrally formed with the support wall 111. The support wall 111 and the two first sidewalls 112 form a U-shaped structure.

[0114] In some embodiments, the two first sidewalls 112 may be located on one side of the support wall 111 in the first direction Z. Along the first direction Z, two adjacent battery cell assemblies 20 are distributed on both sides of the support wall 111, with one battery cell assembly 20 supported by the support wall 111 and the other battery cell assembly 20 located between the two first sidewalls 112. For example, the two adjacent battery cell assemblies 20 may be divided into an upper battery cell assembly 20 and a lower battery cell assembly 20. The support wall 111 supports the upper battery cell assembly 20, and the support wall 111, the two first sidewalls 112, and other walls of the housing 10 form a receiving space that accommodates the lower battery cell assembly 20.

[0115] In the above scheme, along the first direction Z, one of two adjacent battery cell assemblies 20 is supported by a support wall 111. The support wall 111 is integrally formed with the two first side walls 112. The structure formed by the support wall 111 and the two first side walls 112 can provide a better support effect for the battery cell assembly 20, which is conducive to improving the reliability of the battery device 100. At the same time, the other of the two adjacent battery cell assemblies 20 is located between the two first side walls 112. The support wall 111 is integrally formed with the two first side walls 112, eliminating the need for additional support structures on the inner surface of the first side walls 112. This can improve the utilization rate of the space enclosed by the support wall 111 and the two first side walls 112 in the second direction Y, which is beneficial to improving the energy density of the battery device 100.

[0116] According to some embodiments of this application, the support wall 111 and the two first sidewalls 112 are integrally extruded.

[0117] The support wall 111 and the two first side walls 112 can be formed from the substrate by extrusion molding.

[0118] In the above scheme, the support wall 111 and the two first side walls 112 are integrally extruded, which is convenient for processing and manufacturing. The structure formed by the support wall 111 and the two first side walls 112 has high overall strength.

[0119] Please refer to Figure 2 and Figure 3 and further refer to Figure 4 , Figure 4 This is a schematic diagram of the structure of the first sub-box provided in some embodiments of this application. According to some embodiments of this application, the first sub-box 11 further includes two second sidewalls 113, which are arranged opposite each other along a third direction X. A support wall 111 connects the two second sidewalls 113, and the second sidewalls 113 connect the two first sidewalls 112. Another of the two adjacent battery cell assemblies 20 is located between the two second sidewalls 113. The third direction X, the second direction Y, and the first direction Z are perpendicular to each other.

[0120] Two second sidewalls 113 are arranged parallel to each other. The structure formed by the support wall 111 and the two first sidewalls 112 has a third opening at both ends in the third direction X. The two second sidewalls 113 close the two third openings. The structure formed by connecting the support wall 111, the two first sidewalls 112 and the two second sidewalls 113 has a first opening 116 in the first direction Z. The first opening 116 is arranged opposite to the support wall 111 in the first direction Z to facilitate the entry of the battery cell assembly 20 into the first sub-box 11.

[0121] The second sidewall 113 is detachably connected to the support wall 111 and the two first sidewalls 112. For example, the second sidewall 113 is threaded to the support wall 111 and threaded to the first sidewalls 112. Seals are provided between the second sidewall 113 and the support wall 111 and between the second sidewall 113 and the first sidewall 112, respectively, to achieve a sealing fit between the second sidewall 113 and the support wall 111 and between the second sidewall 113 and the first sidewall 112.

[0122] In the above scheme, two second sidewalls 113 are arranged opposite each other along the third direction X, and a battery cell assembly 20 is disposed between the two second sidewalls 113. The two second sidewalls 113 can form a protective barrier for the battery cell assembly 20 in the third direction X, reducing the risk of damage to the battery cell assembly 20 located between the two second sidewalls 113.

[0123] Please refer to Figures 2 to 4 and further refer to Figure 5 and Figure 6 , Figure 5 This is a schematic diagram of the structure of the second sub-box provided in some embodiments of this application. Figure 6 This is a schematic diagram of the structure of the third sub-box provided in some embodiments of this application. According to some embodiments of this application, the box 10 further includes a second sub-box 12 and a third sub-box 13. The second sub-box 12 is connected to the first sub-box 11 and together with the first sub-box 11 forms a first receiving cavity 14; the third sub-box 13 is connected to the first sub-box 11 and together with the first sub-box 11 forms a second receiving cavity 15; each of the first receiving cavity 14 and the second receiving cavity 15 contains a battery cell assembly 20. The battery cell assembly 20 in the first receiving cavity 14 is supported by the second sub-box 12, and the battery cell assembly 20 in the second receiving cavity 15 is supported by a support wall 111.

[0124] The third sub-box 13, the first sub-box 11, and the second sub-box 12 are arranged along the first direction Z.

[0125] In some embodiments, the second sub-box 12 is detachably connected to the first sub-box 11, for example, by snap-fitting or threaded connection.

[0126] Optionally, the second sub-box 12 is threadedly connected to the first sub-box 11 via a first locking member, please refer to... Figures 3 to 5The first sidewall 112 of the first sub-box 11 is a hollow structure. A perforated portion 112a is provided on the outer surface of the first sidewall 112, connecting the interior and exterior of the first sidewall 112. The first sidewall 112 has a first end face facing away from the supporting wall 111, and a first through hole 112b is provided on the first end face, connecting the interior and exterior of the first sidewall 112. The surface of the second sub-box 12 facing the supporting wall 111 is provided with a perforated portion connected to the first through hole 112b. When the first sub-box 11 and the second sub-box 12 are assembled, the first locking member enters the interior of the first sidewall 112 through the hollow portion 112a, passes through the first through hole 112b and connects with the first threaded hole 121 to lock the first sidewall 112 to the second sub-box 12. The second sub-box 12 closes the first opening 116 of the first sub-box 11, and the second sub-box 12 and the first sub-box 11 form the first receiving cavity 14. The first locking member is a component with a threaded section, such as a bolt or screw.

[0127] Optionally, the second sub-box 12 is threadedly connected to the first sub-box 11 via a first locking member. The second sub-box 12 may be provided with a first through hole 112b, and the first sidewall 112 may be provided with a first threaded hole 121. The first locking member passes through the first through hole 112b and is connected to the first threaded hole 121 to lock the second sub-box 12 to the first sidewall 112. The second sub-box 12 closes the first opening 116 of the first sub-box 11, and the second sub-box 12 and the first sub-box 11 form a first receiving cavity 14.

[0128] In some embodiments, the second sub-box 12 may be plate-shaped, and the second sub-box 12 closes the first opening 116 of the first sub-box 11; or, the second sub-box 12 may have an opening toward the support wall 111, and the second sub-box 12 and the first sub-box 11 may be interlocked to form a first receiving cavity 14.

[0129] In some embodiments, the third sub-box 13 is a hollow structure with an opening facing the support wall 111 (for ease of distinction, this opening is defined as the second opening 132 and is marked in the figure). The third sub-box 13 is fastened to the side of the support wall 111 opposite to the second sub-box 12. The support wall 111 closes the second opening 132. The third sub-box 13 and the first sub-box 11 form a second receiving cavity 15.

[0130] In some embodiments, the third sub-box 13 is detachably connected to the first sub-box 11, for example, by snap-fitting or threaded connection.

[0131] Optionally, the third sub-box 13 is threadedly connected to the first sub-box 11 via a second locking member, please refer to... Figure 3 , Figure 4 and Figure 6 The third sub-box 13 is provided with a second through hole 131. In the first sub-box 11 connected to the third sub-box 13, the first sub-box 11 is provided with a second threaded hole 115 corresponding to the second through hole 131. The second locking member passes through the second through hole 131 and connects with the second threaded hole 115 to lock the third sub-box 13 to the first sub-box 11. The support wall 111 closes the second opening 132. The third sub-box 13 and the first sub-box 11 form a second receiving cavity 15. The second locking member is a component with a threaded section, such as a bolt or screw.

[0132] In an embodiment where only one first sub-box 11 is provided between the third sub-box 13 and the second sub-box 12, along the first direction Z, two adjacent battery cell assemblies 20 are distributed on both sides of the support wall 111, one of which is located in the first receiving cavity 14 and supported by the second sub-box 12; the other is located in the second receiving cavity 15 and supported by the support wall 111.

[0133] In an embodiment where multiple first sub-boxes 11 are arranged between the third sub-box 13 and the second sub-box 12, along the first direction Z, the multiple first sub-boxes 11 have a first end sub-box 11a near the second sub-box 12 and a second end sub-box 11b near the third sub-box 13. The second sub-box 12 and the first end sub-box 11a form a first receiving cavity 14, in which a battery cell assembly 20 is received and supported by the second sub-box 12. The third sub-box 13 and the second end sub-box 11b form a second receiving cavity 15, in which a battery cell assembly 20 is received and supported by a support wall 111.

[0134] In the above scheme, the second sub-box 12 and the third sub-box 13 are distributed on both sides of the first sub-box 11 along the first direction Z. The second sub-box 12 and the first sub-box 11 form a first receiving cavity 14, and the third sub-box 13 and the first sub-box 11 form a second receiving cavity 15. The first receiving cavity 14 and the second receiving cavity 15 respectively accommodate two adjacent battery cell assemblies 20 along the first direction Z, so as to realize the arrangement of multiple battery cell assemblies 20 in the first direction Z.

[0135] Please refer to Figure 7 and Figure 8 , Figure 7 This is an exploded view of the structure of a battery device provided in other embodiments of this application. Figure 8This is a cross-sectional view of a battery device provided in some other embodiments of this application. According to some embodiments of this application, along the first direction Z, a plurality of first sub-boxes 11 are stacked between the second sub-boxes 12 and the third sub-boxes 13. Two adjacent first sub-boxes 11 are connected to each other and form a third receiving cavity 16. Each third receiving cavity 16 contains a battery cell assembly 20, and the battery cell assembly 20 in the third receiving cavity 16 is supported by a support wall 111.

[0136] Multiple first sub-boxes 11 are arranged along the first direction Z. In two adjacent first sub-boxes 11, the support wall 111 of each first sub-box 11 supports a battery cell assembly 20.

[0137] Each first sub-box 11 has a first opening 116 in the first direction Z, the first opening 116 facing the second sub-box 12. Along the first direction Z, in two adjacent first sub-boxes 11, the first opening 116 of the one closer to the third sub-box 13 is closed by the support wall 111 of the one closer to the second sub-box 12, and the two adjacent first sub-boxes 11 form a third receiving cavity 16, in which a battery cell assembly 20 is received, the battery cell assembly 20 being supported by the support wall 111 of the one closer to the second sub-box 12.

[0138] For example, when two first sub-boxes 11 are arranged between the third sub-box 13 and the second sub-box 12, the two first sub-boxes 11 are respectively the first end sub-box 11a and the second end sub-box 11b. The first end sub-box 11a is arranged close to the second sub-box 12, and the second end sub-box 11b is arranged close to the third sub-box 13. The second sub-box 12 and the first end sub-box 11a form a first receiving cavity 14, the first end sub-box 11a and the second end sub-box 11b form a third receiving cavity 16, and the third sub-box 13 and the second end sub-box 11b form a second receiving cavity 15. The first receiving cavity 14, the second receiving cavity 15 and the third receiving cavity 16 each contain a battery cell assembly 20. The battery cell assembly 20 in the first receiving cavity 14 is supported by the second sub-box 12, the battery cell assembly 20 in the second receiving cavity 15 is supported by the support wall 111 of the second end sub-box 11b, and the battery cell assembly 20 in the third receiving cavity 16 is supported by the support wall 111 of the first end sub-box 11a.

[0139] In some embodiments, two adjacent first sub-boxes 11 are detachably connected, for example, by threaded connection, snap-fit, etc.

[0140] Optionally, two adjacent first sub-boxes 11 are threaded together by a third locking member. In the two adjacent first sub-boxes 11, the first sidewall 112 of the one closer to the third sub-box 13 is provided with a third through hole, and the support wall 111 of the one closer to the second sub-box 12 is provided with a third threaded hole. The third locking member passes through the third through hole and is connected to the third threaded hole to lock the two adjacent first sub-boxes 11.

[0141] In some embodiments, multiple first sub-boxes 11 have identical structures. The first sidewall 112 of each first sub-box 11 is hollow, and its outer surface has a perforated portion 112a connecting the interior and exterior of the first sidewall 112. The first sidewall 112 has a first end face facing away from the support wall 111, and this first end face has a third through hole connecting the interior and exterior of the first sidewall 112. The support wall 111 has a third threaded hole corresponding to the third through hole. When two adjacent first sub-boxes 11 are assembled, a third locking member enters the interior of the first sidewall 112 through the perforated portion 112a, passes through the third through hole, and connects with the third threaded hole to lock the two adjacent first sub-boxes 11. The two adjacent first sub-boxes 11 form a third receiving cavity 16. The third locking member is a threaded component, such as a bolt or screw.

[0142] For ease of manufacturing, the third through hole can be the same as the first through hole 112b, and the third threaded hole can be the same as the second threaded hole 115.

[0143] In the above scheme, multiple first sub-boxes 11 are stacked along the first direction Z. Two adjacent first sub-boxes 11 form a third receiving cavity 16, and each third receiving cavity 16 accommodates one battery cell assembly 20. The multiple first sub-boxes 11 cooperate with the second sub-boxes 12 and the third sub-boxes 13 to accommodate multiple battery cell assemblies 20 in the first direction Z, so as to realize the assembly of multiple battery cells in the first direction Z and improve the energy density of the battery device 100. When assembling the battery device 100, the assembly of multiple battery cell assemblies 20 with the support walls 111 of the multiple first sub-boxes 11 can be carried out simultaneously, and then the multiple first sub-boxes 11 assembled with battery cell assemblies 20 are stacked, which can reduce the assembly time and improve the assembly efficiency of the battery device 100.

[0144] Please refer to Figure 3 , Figure 5 and Figure 8 According to some embodiments of this application, a second flow channel 122 is formed inside the wall of the second sub-box 12, and the second flow channel 122 is used to contain the heat exchange medium.

[0145] The second flow channel 122 is formed inside the wall of the second sub-box 12 and serves as a channel for the flow of the heat exchange medium. After the battery device 100 is assembled, the second flow channel 122 can contain the heat exchange medium to facilitate heat exchange between the battery cell assembly 20 and the second sub-box 12. For example, when the heat exchange medium is a cooling medium, the low temperature of the heat exchange medium is transferred to the battery cell assembly 20 through the wall of the second sub-box 12, thereby reducing the temperature of the battery cell assembly 20. Alternatively, when the heat exchange medium is a heating medium, the high temperature of the heat exchange medium is transferred to the battery cell assembly 20 through the wall of the second sub-box 12, thereby increasing the temperature of the battery cell assembly 20.

[0146] In some embodiments, the material of the wall of the second sub-box 12 may have good thermal conductivity so that the heat exchange medium can exchange heat with the battery cell assembly 20 supported by the wall of the second sub-box 12.

[0147] In the above scheme, the second flow channel 122 is provided to facilitate heat exchange between the heat exchange medium contained in the second flow channel 122 and the battery cell assembly 20 carried by the second sub-box 12, so as to regulate the temperature of the battery cell assembly 20 and improve the cycle performance of the battery cell assembly 20.

[0148] Please refer to Figure 3 According to some embodiments of this application, along the first direction Z, the first sub-box 11 has a first opening 116 formed on the side opposite to the third sub-box 13, and the second sub-box 12 covers the first opening 116.

[0149] Please refer to Figure 3 When only one first sub-box 11 is provided between the third sub-box 13 and the second sub-box 12, the first opening 116 of the first sub-box 11 is closed by the second sub-box 12.

[0150] Please refer to Figure 8 When multiple first sub-boxes 11 are provided between the third sub-box 13 and the second sub-box 12, the first opening 116 of the first end sub-box 11a among the multiple first sub-boxes 11 is closed by the second sub-box 12.

[0151] In the above scheme, the second sub-box 12 covers the first opening 116, which facilitates the sealing and cooperation between the second sub-box 12 and the first sub-box 11, and closes the first opening 116, so as to improve the sealing effect of the first receiving cavity 14.

[0152] Please refer to Figure 2 , Figure 5 and Figure 7 According to some embodiments of this application, the second sub-box 12 is a plate-like structure.

[0153] Please refer to Figure 5 and further refer to Figure 9 , Figure 9 for Figure 8 A partial enlarged view at point A. In some embodiments, the second sub-box 12 has a first surface facing the third sub-box 13. The first surface is provided with a recess 123 corresponding to the first sidewall 112. When the second sub-box 12 is assembled with the first sub-box 11, a portion of the first sidewall 112 extends into the recess 123 to reduce the space occupied by the structure after the second sub-box 12 and the first sub-box 11 are assembled in the first direction Z.

[0154] In the above scheme, the second sub-box 12 is a plate structure, which is simple in structure and easy to process and manufacture.

[0155] In some embodiments, the second sub-box 12 is a hollow plate structure, and a second flow channel 122 is formed inside the second sub-box 12 for containing the heat exchange medium.

[0156] According to some embodiments of this application, the second sub-box 12 is integrally extruded.

[0157] The material of the second sub-box 12 has good ductility and is suitable for extrusion molding. For example, the material of the second sub-box 12 can be aluminum alloy, and the aluminum alloy substrate can be integrally extruded into the second sub-box 12 using an extrusion device.

[0158] In the above scheme, the second sub-box 12 is integrally extruded and has high strength, which facilitates the provision of better support for the battery cell assembly 20.

[0159] According to some embodiments of this application, the third sub-box 13 is a one-piece molded structure.

[0160] In some embodiments, the third sub-box 13 can be integrally stamped, integrally injection molded, etc.

[0161] In the above scheme, the third sub-box 13 is a one-piece molded structure with high overall strength.

[0162] According to some embodiments of this application, a second opening 132 is formed on the side of the third sub-box 13 facing the first sub-box 11, and the support wall 111 closes the second opening 132.

[0163] The walls of the third sub-box 13 form an open-end receiving space, the opening of which is the second opening 132 and faces the supporting wall 111. When assembling the third sub-box 13 with the first sub-box 11, the battery cell assembly 20 is first placed on the supporting wall 111 of the first sub-box 11, and then the third sub-box 13 is fastened to the supporting wall 111. The third sub-box 13 is connected to the first sub-box 11. The supporting wall 111 closes the second opening 132 and forms a second receiving cavity 15, in which the battery cell assembly 20 is received.

[0164] In the above scheme, the second opening 132 of the third sub-box 13 is arranged facing the support wall 111 so as to facilitate the assembly of the third sub-box 13 with the support wall 111 and improve the sealing effect of the second receiving cavity 15.

[0165] Please refer to Figure 3 and Figure 8 According to some embodiments of this application, the thickness of the wall of the third sub-box 13 is less than the thickness of the support wall 111.

[0166] In some embodiments, the thickness of the wall of the third sub-box 13 may be less than the thickness of the wall of the second sub-box 12.

[0167] In the above scheme, the battery cell assembly 20 housed in the second housing cavity 15 is supported by the support wall 111. The strength of the third sub-box 13 can be less than that of the first sub-box 11. Therefore, the thickness of the wall of the third sub-box 13 can be designed to be less than the thickness of the support wall 111. For example, the material of the third sub-box 13 can be a material with lower strength, or the amount of material used in the wall of the third sub-box 13 can be less than the amount of material used in the wall of the first sub-box 11, so as to save materials and reduce manufacturing costs.

[0168] According to some embodiments of this application, the wall thickness of the third sub-box 13 is H, which satisfies 0.3mm≤H≤5mm.

[0169] The wall thickness H of the third sub-box 13 can be, but is not limited to, any one or any two of 0.3mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm.

[0170] In the above scheme, the thickness of the wall of the third sub-box 13 satisfies the above relationship. While ensuring that the third sub-box 13 has a certain strength, the thickness of the wall of the third sub-box 13 is small, and the material used in the third sub-box 13 is less, which helps to reduce manufacturing costs.

[0171] According to some embodiments of this application, the third sub-box 13 is a plastic part or a sheet metal part.

[0172] Optionally, the third sub-box 13 can be a box 10 integrally injection molded, or the third sub-box 13 can be a box 10 formed by sheet metal processing.

[0173] In the above scheme, the third sub-box 13 is made of plastic or sheet metal, which is easy to process and manufacture, and has a low manufacturing cost.

[0174] According to some embodiments of this application, the first sub-box 11 is made of aluminum alloy.

[0175] In the above scheme, the first sub-box 11 is made of aluminum alloy. The first sub-box 11 can have high strength, corrosion resistance and good thermal conductivity. At the same time, aluminum alloy has high ductility and machinability, which facilitates the processing and manufacturing of the first sub-box 11.

[0176] According to some embodiments of this application, this application also provides an electrical device that includes a battery device 100 provided according to any of the above embodiments.

[0177] The electrical device is any of the above-mentioned devices or systems that use battery device 100 as a power source.

[0178] According to some embodiments of this application, please refer to Figures 2 to 9 This application provides a battery device 100, which includes a housing 10 and a plurality of battery cell assemblies 20.

[0179] The housing 10 includes a first sub-housing 11, a second sub-housing 12, and a third sub-housing 13, arranged sequentially along the first direction Z.

[0180] The first sub-box 11 includes a support wall 111, two first side walls 112, and two second side walls 113. The two first side walls 112 are arranged opposite each other along the second direction Y. The support wall 111 connects the two first side walls 112. The support wall 111 and the first side walls 112 are integrally extruded and formed into a U-shaped structure. The two second side walls 113 are arranged opposite each other along the third direction X. The support wall 111 connects the two second side walls 113, and the second side walls 113 connect the two first side walls 112. The structure formed by the support wall 111, the two first side walls 112, and the two second side walls 113 has a first opening 116. The first opening 116 is arranged opposite to the support wall 111 in the first direction Z.

[0181] The second sub-box 12 has a plate-like structure. When the second sub-box 12 is assembled with the adjacent first sub-box 11, the second sub-box 12 closes the first opening 116 of the first sub-box 11, and the second sub-box 12 and the first sub-box 11 form a first receiving cavity 14. The first receiving cavity 14 houses a battery cell assembly 20, which is supported by the second sub-box 12. The second sub-box 12 has a simple structure, can be integrally extruded, is easy to process and manufacture, and has high strength.

[0182] The third sub-box 13 is connected to the adjacent first sub-box 11. The third sub-box 13 has an opening facing the support wall 111, which closes the opening and forms a second receiving cavity 15. The second receiving cavity 15 contains a battery cell assembly 20, which is supported by the support wall 111. The third sub-box 13 is a single-piece structure, and the thickness of the wall of the third sub-box 13 is less than the thickness of the support wall 111. The battery cell assembly 20, housed in the second receiving cavity 15, is supported by the support wall 111. The strength of the third sub-box 13 can be less than that of the first sub-box 11. Therefore, the thickness of the wall of the third sub-box 13 can be designed to be less than the thickness of the support wall 111. For example, the material of the third sub-box 13 can be a material with lower strength, or the amount of material used in the wall of the third sub-box 13 can be less than the amount of material used in the wall of the first sub-box 11, in order to save materials and reduce manufacturing costs.

[0183] The support wall 111 is located between two adjacent battery cell modules 20. The support wall 111 supports one battery cell module 20. The support wall 111 and the first side wall 112 are integrally extruded. The overall strength of the structure formed by the support wall 111 and the wall 10a of the housing 10 in the second direction Y is high. The connection reliability between the support wall 111 and the wall 10a of the housing 10 in the second direction Y is high. This is beneficial for the battery device 100 to set multiple battery cell modules 20 in the first direction Z. At the same time, the inner surface of the wall 10a of the housing 10 in the second direction Y does not need to be provided with an additional support structure to cooperate with the support wall 111. This can improve the space utilization rate inside the housing 10 in the second direction Y and facilitate the improvement of the energy density of the battery device 100.

[0184] In some embodiments, a plurality of first sub-boxes 11 are disposed between the third sub-box 13 and the second sub-box 12. The plurality of first sub-boxes 11 are stacked along the first direction Z. Among the plurality of first sub-boxes 11, two adjacent first sub-boxes 11 form a third receiving cavity 16. The third receiving cavity 16 contains a battery cell assembly 20, which is supported by a support wall 111 of the first sub-box 11 near the second sub-box 12. The arrangement of the plurality of first sub-boxes 11 enables the stacking arrangement of a plurality of battery cell assemblies 20. The support wall 111 is integrally formed with the first side wall 112, which improves the strength of the box 10 and allows multiple battery cell assemblies 20 to be stacked in the first direction Z, thereby facilitating the improvement of the energy density of the battery device 100.

[0185] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A battery device, characterized in that, include: Box; Multiple battery cell assemblies are housed within the housing, and the multiple battery cell assemblies are arranged along a first direction; The housing includes a support wall located between two adjacent battery cell assemblies and supporting at least one battery cell assembly. The support wall is integrally formed with the wall of the housing in a second direction, wherein the first direction is perpendicular to the second direction.

2. The battery device according to claim 1, characterized in that, The support wall has a first flow channel inside, which is used to contain the heat exchange medium.

3. The battery device according to claim 1, characterized in that, The enclosure includes a first sub-enclosure, the first sub-enclosure includes the supporting wall and two first side walls, the two first side walls are arranged opposite to each other along the second direction, the supporting wall connects the two first side walls, and the supporting wall is integrally formed with the first side walls; One of two adjacent battery cell assemblies is supported by the support wall, and the other is located between the two first side walls.

4. The battery device according to claim 3, characterized in that, The support wall and the two first side walls are integrally extruded.

5. The battery device according to claim 3, characterized in that, The first sub-box also includes two second sidewalls, which are arranged opposite each other along a third direction. The support wall connects the two second sidewalls, and the second sidewalls connect the two first sidewalls. The other of the two adjacent battery cell assemblies is located between the two second sidewalls. The third direction, the second direction, and the first direction are perpendicular to each other.

6. The battery device according to claim 3, characterized in that, The enclosure further includes a second sub-enclosure and a third sub-enclosure. The second sub-enclosure is connected to the first sub-enclosure and together with the first sub-enclosure forms a first receiving cavity. The third sub-enclosure is connected to the first sub-enclosure and together with the first sub-enclosure forms a second receiving cavity. Each of the first and second accommodating cavities contains one of the battery cell assemblies. The battery cell assembly in the first accommodating cavity is supported by the second sub-casing, and the battery cell assembly in the second accommodating cavity is supported by the support wall.

7. The battery device according to claim 6, characterized in that, Along the first direction, multiple first sub-boxes are stacked between the second sub-box and the third sub-box. Two adjacent first sub-boxes are connected to each other and form a third receiving cavity. Each third receiving cavity contains one battery cell assembly, and the battery cell assembly in the third receiving cavity is supported by the support wall.

8. The battery device according to claim 6, characterized in that, The interior of the wall of the second sub-box has a second flow channel, which is used to contain the heat exchange medium.

9. The battery device according to claim 6, characterized in that, Along the first direction, the first sub-box has a first opening on the side opposite to the third sub-box, and the second sub-box covers the first opening.

10. The battery device according to claim 6, characterized in that, The second sub-box is integrally extruded.

11. The battery device according to claim 6, characterized in that, The third sub-box is a one-piece molded structure.

12. The battery device according to claim 11, characterized in that, Along the first direction, the third sub-box has a second opening on the side facing the first sub-box, and the support wall closes the second opening.

13. The battery device according to claim 6, characterized in that, The thickness of the wall of the third sub-box is less than the thickness of the supporting wall.

14. The battery device according to claim 6, characterized in that, The wall thickness of the third sub-box is H, which satisfies 0.3mm≤H≤5mm.

15. The battery device according to claim 6, characterized in that, The third sub-box is made of plastic or sheet metal.

16. The battery device according to claim 3, characterized in that, The first sub-box is made of aluminum alloy.

17. An electrical device, characterized in that, Includes the battery device as described in any one of claims 1-16.

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