Battery device and electric device

Abstract

A battery device (1000) and an electric device (2000). The battery device (1000) comprises: a case (1), a battery module (2) and a heat exchange assembly (5), wherein the battery module (2) is arranged in the case (1), and the battery module (2) comprises a plurality of battery units (22) arranged in a first direction (X), each battery unit (22) comprising a housing (221) and a plurality of electrode assemblies (222) arranged in the housing (221); and the heat exchange assembly (5) is arranged on at least one side of the battery module (2) in a second direction (Z) and extends to each battery unit (22) in the first direction (X), and the wall surface having the largest area of the housing of each battery unit (22) faces the heat exchange assembly (5) and exchanges heat with the heat exchange assembly (5).

Description

Battery devices and electrical appliances

[0001] Cross-references to related applications

[0002] This application is based on and claims priority to the following patent applications: PCT / CN2024 / 144682, PCT / CN2024 / 144680, PCT / CN2024 / 144678, PCT / CN2024 / 144675, and PCT / CN2024 / 144674, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of battery technology, and more particularly to a battery device and an electrical device. Background Technology

[0004] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, the battery device, as the power source, plays an irreplaceable and crucial role. However, in related technologies, the temperature control of battery devices is relatively poor, making it difficult to meet the demands of high-power fast charging and extreme environments.

[0005] Application content

[0006] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a battery device and an electrical device, wherein a heat exchange component is capable of exchanging heat for each battery pack to achieve temperature control of the battery device and meet the requirements of the battery device for high-power fast charging and extreme environments.

[0007] In a first aspect, embodiments of this application provide a battery device, which includes: a housing, a battery module, and a heat exchange assembly. The battery module is disposed in the housing and includes multiple battery packs arranged along a first direction. Each battery pack includes a housing and multiple electrode assemblies disposed within the housing. The heat exchange assembly is disposed on at least one side of the battery module in a second direction and extends to each battery pack in the first direction. The wall surface with the largest area of ​​the housing of each battery pack faces the heat exchange assembly and exchanges heat with the heat exchange assembly.

[0008] In the above technical solution, the heat exchange component can cool / heat each battery pack, achieving temperature control for each battery pack and thus temperature control of the battery device to meet the requirements of high-power fast charging and extreme environments. Furthermore, the largest surface area of ​​each battery pack's casing (in other words, the largest surface area of ​​each battery pack) exchanges heat with the heat exchange component, increasing the contact area between the battery pack and the heat exchange component, resulting in more uniform heat transfer, avoiding localized overheating or overcooling, and reducing the internal temperature gradient of the battery device.

[0009] In some embodiments, the heat exchange assembly includes a plurality of heat exchange elements, and the battery module has heat exchange elements on both sides in the second direction.

[0010] In the above technical solution, the heat exchange components on opposite sides can exchange heat with the battery pack on opposite sides of the corresponding battery pack, so that the internal temperature of the battery pack is more uniform during heat exchange and the heat exchange efficiency of the heat exchange components can be improved.

[0011] In some embodiments, each heat exchanger is a heating film.

[0012] In the above technical solution, the heating film has good temperature control capability and thermal response speed, can heat up quickly and maintain stable output, and the thickness of the heating film is usually small so that the heat exchanger does not occupy a large space in the battery device.

[0013] In some embodiments, multiple heating films of the heat exchange assembly are connected in series.

[0014] The above technical solution facilitates the achievement of the same heating power for each heating film, thereby making the temperature of the battery module more uniform.

[0015] In some embodiments, the battery device includes multiple battery modules and multiple heat exchange components, each battery module having a corresponding heat exchange component, and the multiple heat exchange components being connected in series.

[0016] The above technical solution facilitates the achievement of the same heating power for each heating component, thereby enabling more uniform temperature distribution across multiple battery modules.

[0017] In some embodiments, the battery module further includes a fixed frame, within which multiple battery packs are disposed, and a heat exchange component is disposed on the fixed frame.

[0018] In the above technical solution, the heat exchange component can exchange heat with the electrode components inside the corresponding battery pack by means of the fixed frame and the outer shell of each battery pack, so that the temperature distribution of the battery module is more uniform. There is no need to configure a separate heat exchange component for each battery pack, and there is no limitation on the number, location and area of ​​the heat exchange components. To a certain extent, it helps to reduce the number of heat exchange components and thus reduce manufacturing costs.

[0019] In some embodiments, the fixed frame includes a first side plate and a second side plate disposed opposite to each other, the first side plate being fixed to the bottom wall of the housing, and both the first side plate and the second side plate being provided with heat exchange components.

[0020] In the above technical solution, the two heat exchange components can exchange heat with the corresponding battery pack on the upper and lower sides of the battery module, so that the internal temperature of the battery pack is more uniform during heat exchange and it is less likely to cause local temperature unevenness.

[0021] In some embodiments, the heat exchange assembly is glued to the fixed frame.

[0022] In the above technical solution, the relative positions of the heat exchange component and the battery module are made more stable, so that the heat exchange component can achieve stable heat exchange with the corresponding battery pack.

[0023] In some embodiments, the battery device further includes a pressure plate, and the battery device includes a plurality of battery modules, with the pressure plate fixedly connected to at least two battery modules.

[0024] In the above technical solution, multiple battery packs are first fixed into a whole by a fixed frame, and then fixedly connected to at least two battery modules by a pressure plate, so that the integrity of the multiple battery packs can be better. Even when the battery device is subjected to vibration or external impact, the multiple battery packs are not easy to separate or misalign, so that the battery device can have better structural strength and rigidity. At the same time, the battery device can have better integrity, which facilitates the improvement of the reliability of the battery device.

[0025] In some embodiments, at least a portion of the heat exchange components are disposed between the pressure plate and the fixed frame.

[0026] In the above technical solution, at least some heat exchange components can be clamped between the pressure plate and the fixed frame. The clamping force between the pressure plate and the fixed frame makes the setting position of the at least some heat exchange components more stable, which facilitates the improvement of the heat exchange stability of the heat exchange components.

[0027] In some embodiments, the pressure plate is disposed on the fixed frame by a first adhesive layer, the first adhesive layer having a clearance space, and at least a portion of the heat exchange components are disposed within the clearance space.

[0028] In the above technical solution, the pressure plate can be directly bonded and fixed to the fixed frame through the first adhesive layer, instead of the pressure plate being fixed to at least part of the heat exchange components through the first adhesive layer, so that the pressure plate and the corresponding fixed frame can have better connection strength and the battery device can have better overall integrity.

[0029] In some embodiments, the size of the battery pack in the second direction is smaller than the size of the battery pack in the first direction, and the size of the battery pack in the first direction is smaller than the size of the battery pack in the third direction, wherein the first direction, the second direction, and the third direction are arranged to intersect each other.

[0030] In the above technical solution, the battery pack has a reasonable size in all directions, which can balance energy density and structural strength, so as to improve the practicality of the battery device.

[0031] In some embodiments, the battery module further includes a fixing frame, in which a plurality of battery packs are disposed. The fixing frame includes an end plate and a side plate. In a first direction, each side of the plurality of battery packs is provided with an end plate. In a second direction, at least one side of the plurality of battery packs is provided with a side plate. The two ends of the side plate in the first direction are fixedly connected to the end plate respectively. The first direction and the second direction intersect. A heat exchange component is disposed on the side plate.

[0032] In the above technical solution, by setting end plates on both sides of the multiple battery pack arrangement direction, and by setting side plates to connect the two end plates respectively, the two end plates can be limited to limit the multiple battery packs. The end plates and side plates can cooperate to jointly limit the multiple battery packs in different directions, which can improve the structural stability of the multiple battery packs after they are fixed together. At the same time, it can protect the multiple battery packs in different directions, improve the protection effect of the multiple battery packs, and improve the mechanical strength of the multiple battery packs after they are fixed together. In this way, the reliability and safety of the multiple battery packs can be improved, and the safety hazards of the battery device can be reduced.

[0033] In some embodiments, multiple electrode components within each battery pack are stacked in a first direction, and each electrode component is a solid-state electrode component.

[0034] In the above technical solution, the multiple electrode components stacked along the first direction in the battery pack enable the multiple battery packs after assembly to be stacked and fixed in other directions, which makes more rational use of the space of the battery device, saves space and reduces its size, thereby improving the energy density of the battery device.

[0035] In some embodiments, each electrode assembly includes two first sidewalls disposed opposite each other in a first direction, two second sidewalls disposed opposite each other in a second direction, and two third sidewalls disposed opposite each other in a third direction. At least two of the first sidewalls, second sidewalls, and third sidewalls of each electrode assembly are glued to the housing, and the first direction, second direction, and third direction intersect each other in pairs.

[0036] In the above technical solution, by adhesively bonding at least two intersecting sidewalls of the first, second, and third sidewalls of each electrode assembly to the outer casing, the connection strength between the electrode assembly and the outer casing is improved. This is beneficial to improving the assembly reliability of the electrode assembly, reducing the risk of the electrode assembly shaking, thereby improving the rigidity of the battery pack, and also improving the reliability and safety of the battery pack.

[0037] In some embodiments, each electrode assembly is disposed within a packaged bag; or each electrode assembly is unpackaged and directly housed within a housing.

[0038] In the above technical solutions, the encapsulation bag can serve as an insulating barrier, improving the safety of the battery pack. Furthermore, the harmful gases generated by the electrode components can be sealed within the encapsulation bag, which helps improve the reliability of the battery pack. Alternatively, the electrode components can be unencapsulated and directly housed within the outer casing, reducing the space occupied by the casing and allowing the battery pack to have a higher energy density.

[0039] Secondly, embodiments of this application provide an electrical device, including the battery device of the first aspect.

[0040] In the above technical solutions, the battery device has good temperature control capabilities, which can meet the battery device's requirements for high-power fast charging and extreme environments, and is conducive to improving the applicability and reliability of the power device.

[0041] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0042] Figure 1 is a schematic diagram of the structure of an electrical device provided in some embodiments of this application as a vehicle;

[0043] Figure 2 is an exploded view of a battery device provided in some embodiments of this application;

[0044] Figure 3 is a schematic diagram of a battery device provided in some embodiments of this application;

[0045] Figure 4 is a cross-sectional view of Figure 3 at point AA;

[0046] Figure 5 is an exploded view of a battery module provided in some embodiments of this application;

[0047] Figure 6 is an enlarged view of point A in Figure 5;

[0048] Figure 7 is a schematic diagram of a battery module provided in some embodiments of this application;

[0049] Figure 8 is a cross-sectional view of Figure 7 at point BB;

[0050] Figure 9 is an enlarged view of point B in Figure 8;

[0051] Figure 10 is a schematic diagram of a battery pack provided in some embodiments of this application;

[0052] Figure 11 is a cross-sectional view of Figure 10 at point CC;

[0053] Figure 12 is an exploded view of a battery pack provided in some embodiments of this application;

[0054] Figure 13 is another schematic diagram of a battery pack provided in some embodiments of this application;

[0055] Figure 14 is a cross-sectional view of Figure 13 at point DD;

[0056] Figure 15 is a cross-sectional view of Figure 13 at EE;

[0057] Figure 16 is another exploded view of a battery pack provided in some embodiments of this application.

[0058] Reference numerals: Battery device 1000, Electrical device 2000, Housing 1, Battery module 2, Fixing frame 21, End plate 211, Clearance groove 2111, Side plate 212, First mating part 2121, Second mating part 2122, First side plate 2123, Second side plate 2124, Fixing member 213, Battery pack 22, Housing 221, First wall part 2211, Second wall part 2212, Third wall part 2213, Fourth wall part 2214, Fifth wall part 2215, Sixth wall part 2216, First through hole 2217, Support part 2218, Sub-support body 22181, Valve body mounting hole 2219, Electrode assembly 222, First side wall 2221, Second side wall 2222, Third side wall 2223, Insulating assembly 223, Insulating coating 2231, Insulating sheet 2232 First buffer 224, second buffer 225, pressure plate 3, controller 41, motor 42, heat exchange assembly 5, heat exchange component 51, first heat exchange component 511, second heat exchange component 512, first adhesive layer 6, first adhesive part 61, clearance space 62, second adhesive layer 7, first direction X, second direction Z, third direction Y. Detailed Implementation

[0059] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0060] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0061] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0062] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to direct connection or indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0063] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0064] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0065] In this application, "multiple" means two or more (including two).

[0066] A battery pack typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process, active ions shuttle between the positive and negative electrodes, inserting and extracting. The separator, positioned between the positive and negative electrodes, reduces the risk of short circuits while allowing active ions to pass through.

[0067] In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0068] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0069] 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 aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors 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.).

[0070] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxide may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM)622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

[0071] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0072] In some embodiments, the negative electrode may be a negative electrode sheet, which may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0073] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0074] As an example, the negative electrode active material may be a negative electrode active material 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, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0075] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0076] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0077] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0078] As an example, polymer solid electrolytes can be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0079] As an example, inorganic solid electrolytes may include one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphate sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0080] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0081] In some implementations, the electrode assembly is a stacked structure.

[0082] As an example, multiple positive and negative electrode plates can be set, and multiple positive and multiple negative electrode plates can be stacked alternately.

[0083] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0084] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0085] In some implementations, the battery pack may include a housing. The housing is used to seal components such as electrode assemblies. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0086] The battery apparatus mentioned in the embodiments of this application may include multiple battery packs to provide higher voltage and capacity, and the multiple battery packs are connected in series, parallel or mixed via a bus assembly.

[0087] In some embodiments, the battery device may be a battery pack, which may include a housing and multiple battery packs housed within the housing.

[0088] As an example, the battery pack can be housed in a casing in a way that is fixed within the casing.

[0089] As an example, the enclosure may include a first part and a second part. The first and second parts are fastened together to form a closed space inside the enclosure for housing the battery pack. Here, "closed" refers to covering or shutting off; it can be sealed or not sealed. The first part may be a top cover or a bottom plate.

[0090] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the battery pack.

[0091] 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.

[0092] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0093] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, the battery device, as the power source, plays an irreplaceable and crucial role. However, in related technologies, the temperature control of the battery device is poor, which affects the charging power of the battery device and cannot adequately meet the application requirements of the battery device in high-temperature and low-temperature scenarios. Therefore, the battery device still needs improvement.

[0094] Based on the above considerations, in order to improve the applicability of the battery device, a battery device is proposed. The battery device includes: a housing, a battery module, and a heat exchange component. The battery module is disposed in the housing and includes multiple battery packs arranged along a first direction. Each battery pack includes a housing and multiple electrode components disposed within the housing. The heat exchange component is disposed on at least one side of the battery module in a second direction and extends to each battery pack in the first direction. The wall surface with the largest area of ​​the housing of each battery pack faces the heat exchange component and exchanges heat with the heat exchange component.

[0095] In the above technical solution, the heat exchange component can cool / heat each battery pack, achieving temperature control for each battery pack and thus temperature control of the battery device to meet the requirements of high-power fast charging and extreme environments. Furthermore, the largest surface area of ​​each battery pack's casing (in other words, the largest surface area of ​​each battery pack) exchanges heat with the heat exchange component, increasing the contact area between the battery pack and the heat exchange component, resulting in more uniform heat transfer, avoiding localized overheating or overcooling, and reducing the internal temperature gradient of the battery device.

[0096] This application provides an electrical device that uses the battery device disclosed herein as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0097] For ease of explanation, the following embodiments use a vehicle as an example to describe the structure of the electrical device 2000 and the battery device 1000 of this application.

[0098] Please refer to Figure 1, which is a schematic diagram of the structure of an electrical device 2000 provided in some embodiments of this application as a vehicle. The vehicle can be a gasoline vehicle, a natural gas vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle is equipped with a battery device 1000, which can be located at the bottom, front, or rear of the vehicle. The battery device 1000 can be used to supply power to the vehicle; for example, the battery device 1000 can serve as the vehicle's operating power source. The vehicle may also include a controller 41 and a motor 42. The controller 41 is used to control the battery device 1000 to supply power to the motor 42, for example, for the vehicle's starting, navigation, and driving power needs. In some embodiments of this application, the battery device 1000 can not only serve as the vehicle's operating power source but also as the vehicle's driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to the vehicle.

[0099] Please refer to Figure 2, which is an exploded view of a battery device 1000 provided in some embodiments of this application. In some embodiments of this application, the battery device 1000 includes: a housing 1 and a plurality of battery modules 2, each battery module 2 including a plurality of battery packs 22, and the plurality of battery modules 2 are disposed within the housing 1.

[0100] The housing 1 has an enclosed space inside for accommodating the battery pack 22. The housing 1 can have various structures. In some embodiments, the housing 1 may include a first part and a second part, which can be interlocked. The first and second parts can have various shapes, such as cuboids or cylinders. The first part can be a hollow structure open on one side, and the second part can also be a hollow structure open on one side. Interlocking the open side of the second part with the open side of the first part forms the housing 1 with an enclosed space. Alternatively, the first part can be a hollow structure open on one side, and the second part can be a plate-like structure, interlocking with the open side of the first part to form the housing 1 with an accommodating space.

[0101] In the battery device 1000, there are multiple battery packs 22. These battery packs 22 can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery packs 22 are connected in both series and parallel configurations. All battery packs 22 are directly connected in series, in parallel, or in a mixed configuration, and the entire assembly consisting of all battery packs 22 is housed within the housing 1.

[0102] In some embodiments, the battery device 1000 may further include a busbar assembly, through which multiple battery packs 22 can be electrically connected to each other to achieve series, parallel, or mixed connection of the multiple battery packs 22. The busbar assembly may be a metallic conductor, such as copper, iron, aluminum, stainless steel, or aluminum alloy.

[0103] Hereinafter, with reference to FIG2, a battery device 1000 according to an embodiment of the present application will be described.

[0104] The battery device 1000 includes: a housing 1, a battery module 2, and a heat exchange assembly 5. The battery module 2 is disposed inside the housing 1 and includes a plurality of battery packs 22 arranged along a first direction X. Each battery pack 22 includes a housing 221 and a plurality of electrode assemblies 222 disposed within the housing 221. The heat exchange assembly 5 is disposed on at least one side of the battery module 2 in a second direction Z and extends to each battery pack 22 in the first direction X. The wall surface with the largest area of ​​the housing 221 of each battery pack 22 faces the heat exchange assembly 5 and exchanges heat with the heat exchange assembly 5.

[0105] It is understood that the heat exchange component 5 may be disposed on one side of the battery module 2 in the second direction Z; or, the heat exchange component 5 may be disposed on both sides of the battery module 2 in the second direction Z, and this application does not limit this.

[0106] In some examples, the battery device 1000 includes a battery module 2 and a heat exchange component 5; in other examples, the battery device 1000 may include two or more battery modules 2, and may also include two or more heat exchange components 5, with the number of heat exchange components 5 and battery modules 2 being the same, so as to achieve a one-to-one correspondence between the heat exchange components 5 and battery modules 2. Of course, in other embodiments of this application, the number of battery modules 2 and heat exchange components 5 may also be different. For example, the number of battery modules 2 may be greater than the number of heat exchange components 5, and at least one heat exchange component 5 may be used to exchange heat with the battery packs 22 in two battery modules 2; or, the number of battery modules 2 may be less than the number of heat exchange components 5, and at least one battery pack 22 of battery module 2 may exchange heat with two heat exchange components 5.

[0107] As can be seen, the heat exchange component 5 can cool / heat each battery pack 22, thereby controlling the temperature of each battery pack 22 and thus controlling the temperature of the battery device 1000. This meets the requirements of the battery device 1000 for high-power fast charging and extreme environments, improving the applicability of the battery device 1000. Furthermore, the largest wall surface of the outer casing 221 of each battery pack 22 (in other words, the large surface area of ​​each battery pack 22) exchanges heat with the heat exchange component 5, increasing the contact area between the battery pack 22 and the heat exchange component 5, resulting in more uniform heat transfer, avoiding localized overheating or overcooling, reducing the internal temperature gradient of the battery device 1000, and improving heat exchange reliability. At the same time, it eliminates the need for a separate heat exchange component 5 for each battery pack 22, reducing the number of heat exchange components 5 and lowering the manufacturing cost of the battery device 1000.

[0108] In some examples, the heat generated by the battery device 1000 during charging is amplified. The heat exchange component 5 can quickly dissipate the heat generated by the battery pack 22, avoiding the triggering of charging current limiting due to excessive temperature and shortening the charging time. Moreover, when the battery device 1000 is charged in a low-temperature environment, the lithium-ion activity decreases. The heat exchange component 5 can preheat the battery device 1000 to a suitable temperature (such as above 5°C), activate the lithium-ion activity, and solve the problem of slow charging at low temperatures.

[0109] In other examples, under high-temperature conditions, the increased internal resistance of the battery device 1000 causes additional energy to be dissipated as heat, reducing system energy efficiency. The heat exchange component 5 can dissipate heat from each battery pack 22 in a timely manner, which can reduce this loss and improve the overall energy utilization of the battery system.

[0110] In other examples, when the battery device 1000 is used in high-temperature scenarios (such as deserts or tropical regions), the heat exchange component 5 can cool each battery pack 22 to prevent the battery device 1000 from overheating and ensure that the battery device 1000 operates normally in environments above 50°C; when the battery device 1000 is used in low-temperature scenarios (such as cold regions or winter), the heat exchange component 5 can heat each battery pack 22 to raise the temperature of the battery device 1000 to above 0°C and avoid difficulties in starting up at low temperatures.

[0111] It is understood that the battery device 1000 may include multiple battery modules 2. This application does not limit the number of battery modules 2, nor does it limit the arrangement of the multiple battery modules 2 within the housing 1. The battery module 2 may include multiple battery packs 22. This application does not limit the number of battery packs 22, nor does it limit the arrangement of the multiple battery packs 22 within the fixed frame 21. The battery pack 22 may include multiple electrode assemblies 222. This application does not limit the number of electrode assemblies 222.

[0112] In some embodiments, referring to Figures 2-4, each heat exchange assembly 5 includes multiple heat exchange elements 51. The battery module 2 has heat exchange elements 51 on both sides in the second direction Z. The heat exchange elements 51 on opposite sides can exchange heat with the battery pack 22 on opposite sides, making the internal temperature of the battery pack 22 more uniform during heat exchange, reducing the likelihood of localized temperature unevenness, thus improving the service life of the battery device 1000 and increasing the heat exchange efficiency of the heat exchange assembly 5. For example, heat exchange elements 51 are provided on both the upper and lower sidewalls of the battery module 2.

[0113] Of course, in other embodiments of this application, the heat exchanger 51 can be arranged not only on both sides of the battery module 2 in the second direction Z, but also on at least one side of the battery module 2 in other directions (e.g., the first direction X and the third direction Y described below).

[0114] In some embodiments, each heat exchanger 51 is a heating film with good temperature control capability and thermal response speed, enabling rapid heating and stable output. The heating film is typically thin so that the heat exchanger 51 does not occupy a large space within the battery device 1000, allowing for a more compact structure and improved energy density. Furthermore, the thin heating film can adhere closely to the sidewall of the battery module 2, directly heating the surface of the corresponding battery pack 22 through large-area heat conduction, forming a "surface-to-surface" heating mode, which improves the heat exchange effect of the heat exchanger 51. Simultaneously, the heating film can be cut into any shape to perfectly fit the curved or irregular structure of the frame sidewall, ensuring compatibility with different types of battery modules 2, reducing the possibility of localized overheating or heating blind spots, and improving the reliability of the battery device 1000.

[0115] In other embodiments of this application, each heat exchanger 51 may also be a heating wire, and a PR film (e.g., polyester film, PET film) may be attached to its surface. The PR film can wrap the heating wire to form an electrical insulation layer and prevent short circuit risk.

[0116] In some embodiments, referring to FIG2, multiple heating films of the heat exchange assembly 5 are connected in series so that the current flowing through each heating film can be the same, which facilitates the realization that the heating power of each heating film can be the same, reduces the local overheating or heating blind zone of the battery module 2 caused by the difference in heating power, so that the temperature of the battery module 2 can be more uniform, which facilitates the improvement of the reliability of the battery device 1000.

[0117] As an example, multiple heating films are respectively disposed on different side walls of the battery module 2, and adjacent heating films can be electrically connected through connecting wires to realize the heating circuit of a heat exchange component 5.

[0118] In some embodiments, referring to FIG2, the battery device 1000 includes a plurality of battery modules 2 and a plurality of heat exchange components 5. Each battery module 2 is provided with a heat exchange component 5. The plurality of heat exchange components 5 are connected in series so that the current flowing through each heat exchange component 5 can be the same, which facilitates the realization that the heating power of each heating component can be the same, reduces the uneven temperature of the plurality of battery modules 2 caused by the difference in heating power, and makes the temperature of the plurality of battery modules 2 more uniform, which helps to improve the reliability of the battery device 1000.

[0119] As an example, the battery device 1000 includes two battery modules 2 and two heat exchange components 5. Each heat exchange component 5 is disposed in a corresponding battery module 2, and each heat exchange component 5 includes multiple heating films. Adjacent heating films can be electrically connected through connecting lines, and two adjacent heat exchange components 5 can also be electrically connected through connecting lines, thereby realizing a complete heating circuit.

[0120] Furthermore, by setting multiple heat exchange components 5 in series, only one power supply is needed to power multiple heat exchange components 5, eliminating the need to set a power supply for each heat exchange component 5. This makes the internal structure of the battery device 1000 simpler and more compact, facilitating the miniaturization design of the battery device 1000.

[0121] It is understood that this application does not impose restrictions on the specific connection methods of multiple heating films and multiple heat exchange components 5. The specific connection methods can be optimized and selected according to the actual installation space, structural strength and heat conduction requirements, so as to minimize thermal resistance and improve overall heating efficiency while ensuring structural stability.

[0122] In some embodiments, please refer to Figures 2 and 5. The battery module 2 further includes a fixing frame 21, in which a plurality of battery packs 22 are disposed, and the heat exchange assembly 5 is disposed in the fixing frame 21.

[0123] As can be seen, when the heat exchange component 5 exchanges heat with each battery pack 22 within the fixed frame 21, it can achieve heat exchange with the electrode components 222 inside the corresponding battery pack 22 through the fixed frame 21 and the outer shell 221 of each battery pack 22. In other words, both the fixed frame 21 and the outer shell 221 of each battery pack 22 have a certain temperature transfer function, thereby making the temperature distribution of the battery module 2 more uniform. This eliminates the need to configure a separate heat exchange component 5 for each battery pack 22, and also does not impose restrictions on the number, location, or area of ​​the heat exchange components 5. To a certain extent, this helps to reduce the number of heat exchange components 5, thereby reducing manufacturing costs.

[0124] As an example, the heat exchange component 5 is disposed on at least one side of the fixed frame 21 in the second direction Z.

[0125] In some embodiments, the fixed frame 21 and the outer shell 221 of the corresponding battery pack 22 can be fixed by bonding with thermally conductive adhesive. The thermally conductive adhesive has excellent thermal conductivity and good bonding strength, which can achieve efficient heat conduction while ensuring structural stability, so that the heat exchange component 5 can exchange heat with the corresponding battery pack 22 through the fixed frame 21, thereby improving the reliability of the battery device 1000.

[0126] In some embodiments, referring to Figures 2-5, the fixed frame 21 includes a first side plate 2123 and a second side plate 2124 disposed opposite to each other. The first side plate 2123 is fixed to the bottom wall of the housing 1, and both the first side plate 2123 and the second side plate 2124 are provided with heat exchange elements 51. As an example, the first side plate 2123 is located at the bottom of the fixed frame 21, and the second side plate 2124 is located at the top of the fixed frame 21.

[0127] The first side plate 2123 is fixed to the bottom of the housing 1 to fix the battery module 2 and the housing 1, so that the battery module 2 is not easily displaced during use, the setting position of the battery module 2 can be more stable, and the reliability of the battery device 1000 can be improved.

[0128] As can be seen, heat exchange components 51 can be set at the top and bottom of the fixed frame 21. The two heat exchange components 51 can exchange heat with the corresponding battery pack 22 on the upper and lower sides of the battery module 2, so that the internal temperature of the battery pack 22 is more uniform during heat exchange, and it is not easy to produce local temperature unevenness. It can also improve the heat exchange efficiency of the heat exchange component 5.

[0129] In some examples, the top and bottom surfaces of the fixed frame 21 are the surfaces with the largest area, that is, the area of ​​the top and bottom surfaces of the fixed frame 21 is larger than the side surfaces of the fixed frame 21. By setting heat exchange components 51 on the first side plate 2123 and the second side plate 2124, the heat exchange components 51 can exchange heat for each battery pack 22, so that the temperature of the battery module 2 is more uniform and stable, which helps to improve the reliability of the battery device 1000.

[0130] In some embodiments, the heat exchange component 5 is glued to the fixing frame 21 to make the relative position of the heat exchange component 5 and the battery module 2 more stable, so that the heat exchange component 5 can achieve stable heat exchange with the corresponding battery pack 22, which is conducive to improving the reliability of the battery device 1000. Moreover, the glued connection fixing method is relatively simple and easy to operate, which is beneficial to improving the assembly efficiency of the battery device 1000.

[0131] As an example, the heat exchange component 5 is fixedly connected to the fixing frame 21 by adhesive, double-sided adhesive, or thermally conductive adhesive. Of course, in other embodiments of this application, the heat exchange component 5 can also be sandwiched between the fixing frame 21 and other components, such as between the fixing frame 21 and the housing 1, or between the fixing frame 21 and the pressure plate 3 described later, so as to use the clamping force to fix the heat exchange component 5, so that the heat exchange component 5 can achieve stable heat exchange with the corresponding battery pack 22.

[0132] In some examples, during the assembly of the battery device 1000, the operation must be strictly carried out in accordance with the design drawings and process requirements to ensure the bonding quality and thermal conductivity of each connecting component. At the same time, the arrangement of the heat exchange component 5 should avoid direct contact with the electrode component 222 to prevent the risk of local overheating or short circuit. Moreover, the series connection of multiple heating films and / or multiple heat exchange components 5 must be fully tested to ensure uniform current distribution and circuit stability, and to avoid safety hazards caused by local overload.

[0133] In some embodiments, referring to FIG2, the battery device 1000 further includes a pressure plate 3, and the battery device 1000 includes a plurality of battery modules 2, with the pressure plate 3 fixedly connected to at least two battery modules 2.

[0134] In some examples, the battery device 1000 includes two battery modules 2, and the pressure plate 3 is fixedly connected to both battery modules 2; in other examples, the battery device 1000 includes two or more battery modules 2, and the pressure plate 3 is fixedly connected to two or more battery modules 2, or the pressure plate 3 is fixedly connected to all of the battery modules 2. For example, the battery module 2 includes multiple battery modules 2, and the pressure plate 3 may be fixedly connected to two of the battery modules 2, or the pressure plate 3 may be fixedly connected to three of the battery modules 2, or the pressure plate 3 may be fixedly connected to all of the battery modules 2.

[0135] As can be seen, by first fixing multiple battery packs 22 into a whole by fixing the frame 21, and then fixing them to at least two battery modules 2 by the pressure plate 3, compared with fixing multiple battery packs directly into the box, this application can make the integrity of multiple battery packs 22 better. Even when the battery device 1000 is subjected to vibration or external impact, the multiple battery packs 22 are not easy to separate or misalign, so that the battery device 1000 can have better structural strength and rigidity. At the same time, the battery device 1000 can have better integrity, which is conducive to improving the reliability of the battery device 1000.

[0136] As an example, the battery device 1000 is used in a vehicle. The two ends of the length and / or the two ends of the width of the housing 1 are fixedly connected to the chassis of the vehicle. The battery device 1000 includes two battery modules 2. A pressure plate 3 is fixedly connected to the two battery modules 2. The pressure plate 3 covers at least the gap between the two battery modules 2, that is, the pressure plate 3 is located in the middle of the housing 1. When the battery device 1000 is subjected to vibration or external impact, the middle part of the battery device 1000 is not fixed to the chassis. At this time, the amplitude of the middle part of the battery device 1000 is large. This application improves the overall integrity of the battery device 1000 by setting the pressure plate 3, which can effectively suppress the amplitude of the middle part of the battery device 1000, so that the two battery modules 2 are less likely to separate or misalign, thus improving the reliability of the battery device 1000.

[0137] It should be noted that this application does not limit the specific fixing method of the pressure plate 3 and at least two battery modules 2. For example, the pressure plate 3 and at least two battery modules 2 can be fixed by bolts, clips, welding, adhesive, etc.

[0138] In some examples, the housing 1 may be made of high-strength aluminum alloy or steel to give it good impact resistance, corrosion resistance and thermal conductivity, which will help improve the reliability of the battery device 1000.

[0139] In some examples, the pressure plate 3 can be a high-strength metal plate or a composite material plate to give the pressure plate 3 good structural rigidity and thermal conductivity.

[0140] In some embodiments, referring to Figures 2-4, at least a portion of the heat exchange components 5 are disposed between the pressure plate 3 and the fixing frame 21, that is, at least a portion of the heat exchange components 5 can be clamped between the pressure plate 3 and the fixing frame 21. The clamping force between the pressure plate 3 and the fixing frame 21 makes the placement position of the at least a portion of the heat exchange components 5 more stable, and the relative position of the at least a portion of the heat exchange components 5 and the corresponding battery pack 22 is not easily changed, which facilitates the improvement of the heat exchange stability of the heat exchange components 5 and the reliability of the battery device 1000.

[0141] As an example, the pressure plate 3 is located on the upper side of the corresponding fixed frame 21, and the heat exchange assembly 5 includes a first heat exchanger 511 and a second heat exchanger 512. The first heat exchanger 511 is located on the upper side of the fixed frame 21, and the second heat exchanger 512 is located on the lower side of the fixed frame 21. The first heat exchanger 511 is located between the pressure plate 3 and the fixed frame 21.

[0142] In some embodiments, referring to Figures 2-4, the pressure plate 3 is disposed on the fixed frame 21 through the first adhesive layer 6. The first adhesive layer 6 has a clearance space 62, and at least part of the heat exchange component 5 is disposed in the clearance space 62. This allows the pressure plate 3 to be directly bonded and fixed to the fixed frame 21 through the first adhesive layer 6, rather than the pressure plate 3 being fixed to the aforementioned at least part of the heat exchange component 5 through the first adhesive layer 6. This allows the pressure plate 3 and the corresponding fixed frame 21 to have better connection strength, and the battery device 1000 to have better overall integrity, which facilitates the improvement of the structural strength and rigidity of the battery device 1000.

[0143] In some examples, the pressure plate 3 is located on the upper side of the corresponding fixed frame 21. The pressure plate 3 and the two battery modules 2 are fixedly connected by two first adhesive layers 6 respectively. Each first adhesive layer 6 includes multiple first adhesive parts 61. The multiple first adhesive parts 61 are spaced apart to define a clearance space 62. The heat exchange assembly 5 includes a first heat exchange element 511 and a second heat exchange element 512. The first heat exchange element 511 is located on the upper side of the fixed frame 21, and the second heat exchange element 512 is located on the lower side of the fixed frame 21. The first heat exchange element 511 is located within the clearance space 62 defined by the corresponding first adhesive layer 6, and the first heat exchange element 511 is located between the pressure plate 3 and the fixed frame 21.

[0144] In some examples, the first adhesive layer 6 is a high-strength adhesive to ensure a tight fit between the pressure plate 3 and the corresponding fixing frame 21, reducing thermal resistance and improving heat transfer efficiency. At the same time, the choice of adhesive should also consider high-temperature resistance and anti-aging properties to withstand the thermal cycling tests during long-term operation.

[0145] In some embodiments, please refer to Figures 2-4. The fixing frame 21 is disposed on the housing 1 through the second adhesive layer 7, so that the assembly of the fixing frame 21 and the housing 1 is simpler and easier to operate. Moreover, the adhesive connection can achieve a uniform force distribution between the fixing frame 21 and the housing 1, which can improve the stability of the entire structure and further enhance its rigidity, making it easier to improve the structural strength of the battery device 1000. In addition, the adhesive fixing method can also play a role in sealing and moisture prevention. At the same time, the adhesive fixing can also play a certain role in shock absorption of the battery module 2.

[0146] As an example, the second adhesive layer 7 can be a special adhesive to ensure a stable connection and smooth heat conduction between the battery module 2 and the housing 1. For example, the second adhesive layer 7 can be a polymer structural adhesive or an epoxy resin adhesive to give it excellent bonding strength, structural strength, temperature resistance, and anti-aging ability. It can effectively transfer heat and withstand mechanical stress, which helps to enhance the overall structural stability of the battery device 1000 and prevent the battery module 2 from loosening or shifting due to vibration or impact. This ensures that the battery device 1000 still has good stability and reliability under complex operating conditions.

[0147] In some examples, the heat exchange assembly 5 includes a first heat exchanger 511 and a second heat exchanger 512. The first heat exchanger 511 is located on the upper side of the fixed frame 21, and the second heat exchanger 512 is located on the lower side of the fixed frame 21. The second heat exchanger 512 may be located within the second adhesive layer 7, that is, the second heat exchanger 512 is sandwiched between the fixed frame 21 and the housing 1, so that the second heat exchanger 512 can exchange heat with the corresponding battery pack 22 more stably.

[0148] In some embodiments, referring to Figures 2 and 3, the size of the battery pack 22 in the second direction Z is smaller than the size of the battery pack 22 in the first direction X, and the size of the battery pack 22 in the first direction X is smaller than the size of the battery pack 22 in the third direction Y. The first direction X, the second direction Z, and the third direction Y are arranged in pairs to make the size of the battery pack 22 reasonable in all directions. In some technologies, the size of the battery pack in all directions is large, which leads to poor structural strength of the battery pack. In other technologies, the size of the battery pack in all directions is small, which leads to a decrease in the energy density of the battery device. The battery pack 22 of this application has a reasonable size in all directions, which can balance energy density and structural strength, thereby improving the practicality of the battery device 1000.

[0149] In some embodiments, referring to FIG5, the battery module 2 further includes a fixing frame 21, within which a plurality of battery packs 22 are disposed. The fixing frame 21 includes an end plate 211 and a side plate 212. In a first direction X, each side of the plurality of battery packs 22 is provided with an end plate 211. In a second direction Z, at least one side of the plurality of battery packs 22 is provided with a side plate 212. The side plate 212 is fixedly connected to the end plate 211 at both ends in the first direction X. The first direction X and the second direction Z intersect. The heat exchange assembly 5 is disposed on the side plate 212. For example, each end plate 211 is fixedly connected to the outermost battery pack 22.

[0150] As an example, the side plate 212 of the fixed frame 21 on the side away from the housing 1 in the second direction Z is the second side plate 2124 mentioned above, and the side plate 212 of the fixed frame 21 on the side adjacent to the housing 1 in the second direction Z is the first side plate 2123 mentioned above. Each heat exchange assembly 5 includes a first heat exchange element 511 and a second heat exchange element 512. In the second direction Z, the first heat exchange element 511 is disposed adjacent to the housing 1 compared to the second heat exchange element 512. The first heat exchange element 511 is disposed on the second side plate 2124, and the second heat exchange element 512 is disposed on the first side plate 2123.

[0151] Multiple battery packs 22 can be arranged along the first direction X, so that the multiple battery packs 22 can extend along the first direction X after being grouped together, and the multiple battery packs 22 can make full use of the space of the battery device 1000 in the first direction X. Thus, the multiple battery packs 22 after being grouped together can be stacked and fixed in other directions (different from the first direction X), which can make more reasonable use of the space of the battery device 1000 and save space. Each battery pack 22 can include a housing 221 and multiple electrode assemblies 222. The multiple electrode assemblies 222 can be disposed in the housing 221, which can realize the protection of the multiple electrode assemblies 222 and the entire battery pack 22, and can ensure the reliability and safety of the battery pack 22.

[0152] Multiple battery packs 22 can be provided with end plates 211 on both sides in the first direction X. Each end plate 211 can be fixedly connected to the outermost battery pack 22. The outermost battery pack 22 refers to the two battery packs 22 on both sides of the multiple battery packs 22 in the first direction X. This can protect the multiple battery packs 22 in the first direction X and ensure the reliability and safety of the multiple battery packs 22.

[0153] At least one side of the multiple battery packs 22 in the second direction Z can be provided with a side plate 212. For example, a side plate 212 can be provided on the upper side of the multiple battery packs 22, or a side plate 212 can be provided on the lower side of the multiple battery packs 22, or a side plate 212 can be provided on the upper and lower sides of the multiple battery packs 22 respectively. This can realize the protection of the multiple battery packs 22 in the second direction Z, and can ensure the reliability and safety of the multiple battery packs 22.

[0154] Each side plate 212 can be fixedly connected to the end plates 211 located on both sides of the battery pack 22 in the first direction X at both ends, thereby limiting the two end plates 211 to limit the multiple battery packs 22. This allows the end plates 211 and side plates 212 to cooperate to jointly limit the multiple battery packs 22 in different directions, and to protect the multiple battery packs 22 in different directions.

[0155] This improves the protection of multiple battery packs 22, enhances the structural stability and mechanical strength of the multiple battery packs 22 after they are fixed together, reduces the safety hazards of the battery device 1000, reduces the precision requirements of the multiple battery packs 22 in the fixed assembly process, facilitates operation, reduces the assembly cost of the battery device 1000, and reduces the difficulty and risk of assembling the battery device 1000.

[0156] The first direction X and the second direction Z can intersect. Since the side plate 212 and the end plate 211 can cooperate to limit and protect the multiple battery packs 22 in different directions, the limiting range of the multiple battery packs 22 can be expanded, and the protection range of the multiple battery packs 22 can be expanded. Specifically, the first direction X and the second direction Z can be perpendicular to each other, which can improve the structural stability of the multiple battery packs 22 after they are fixed together.

[0157] At the same time, it can expand the protection range of multiple battery packs 22, improve the protection effect of multiple battery packs 22, improve the mechanical strength of multiple battery packs 22 after being fixed in groups, and improve the reliability and safety of multiple battery packs 22. In addition, the end plate 211 and the side plate 212 can also participate in the heat dissipation of multiple battery packs 22, so that the heat generated by multiple battery packs 22 during operation can be evenly distributed and more easily dissipated, thereby improving the thermal management capability of the battery device 1000.

[0158] It is understandable that each battery pack 22 and the side plate 212 can be bonded together with adhesive, or the outermost battery pack 22 in the first direction X and the end plate 211 can be bonded together with adhesive, or each battery pack 22 and the side plate 212 can be bonded together with adhesive, and the outermost battery pack 22 in the first direction X and the end plate 211 can be bonded together with adhesive. This allows for good bonding and sealing between the battery pack 22 and the end plate 211, as well as between the battery pack 22 and the side plate 212. The adhesive needs to have good high temperature resistance, bonding strength, and a certain degree of elasticity, so that the multiple battery packs 22 can adapt to the thermal expansion and mechanical vibration generated during operation. This can improve the structural stability and mechanical strength of the multiple battery packs 22, and is conducive to achieving insulation of the multiple battery packs 22, thereby reducing the safety hazards of the battery device 1000.

[0159] In the technical solution of this application embodiment, by providing end plates 211 on both sides of the multiple battery packs 22 in the arrangement direction, and by providing side plates 212 to connect the two end plates 211 respectively, the two end plates 211 can be limited to limit the multiple battery packs 22. The end plates 211 and side plates 212 can cooperate to jointly limit the multiple battery packs 22 in different directions, which can improve the structural stability of the multiple battery packs 22 after being fixed in groups, and can protect the multiple battery packs 22 in different directions, which can improve the protection effect of the multiple battery packs 22, and can improve the mechanical strength of the multiple battery packs 22 after being fixed in groups. This can improve the reliability and safety of the multiple battery packs 22, and can reduce the safety hazards of the battery device 1000. At the same time, it is easy to operate and can reduce the assembly cost of the battery device 1000.

[0160] In some embodiments, please refer to Figures 5-9. The side plate 212 has a first mating portion 2121 and a second mating portion 2122. In the first direction X, the first mating portion 2121 overlaps with and is fixedly connected to the end plate 211. In the second direction Z, the second portion overlaps with and is fixedly connected to the end plate 211.

[0161] Both ends of the side plate 212 in the first direction X can be bent to form a first mating part 2121 and a second mating part 2122. That is, each end of the side plate 212 in the first direction X has a first mating part 2121 and a second mating part 2122. The side plate 212 is connected to the end plate 211 through the first mating part 2121 and the second mating part 2122 respectively. The side plate 212 can be integrally stamped to improve its own structural strength and ensure the structural strength of the ends of the side plate 212 (such as the first mating part 2121 and the second mating part 2122), thereby improving the structural strength of the connection between the side plate 212 and the end plate 211.

[0162] Taking one end of the side plate 212 in the first direction X as an example, the first mating part 2121 and the end plate 211 can overlap and be fixedly connected in the first direction X, which can increase the contact area between the first mating part 2121 and the end plate 211, improve the structural strength at the connection between the first mating part 2121 and the end plate 211, and improve the connection effect between the first mating part 2121 and the end plate 211. The second mating part 2122 and the end plate 211 can overlap and be fixedly connected in the second direction Z, which can increase the contact area between the second mating part 2122 and the end plate 211, improve the structural strength at the connection between the second mating part 2122 and the end plate 211, and improve the connection effect between the second mating part 2122 and the end plate 211.

[0163] This ensures a tighter fit between the end of the side plate 212 and the end plate 211, increases the contact area between the side plate 212 and the end plate 211, improves the structural strength at the connection between the side plate 212 and the end plate 211, enhances the connection effect between the side plate 212 and the end plate 211, and improves the connection effect between the two end plates 211. This, in turn, improves the limiting and protection effect on the multiple battery packs 22, enhances the structural stability and mechanical strength of the multiple battery packs 22 after they are fixed together, improves the reliability and safety of the multiple battery packs 22, and reduces the safety hazards of the battery device 1000.

[0164] In some embodiments, please refer to Figures 7-9, the first mating part 2121 and the end plate 211 are fixedly connected by a fastener 213, and the second mating part 2122 and the end plate 211 are fixedly connected by a fastener 213.

[0165] The first mating part 2121 and the second mating part 2122 can be fixedly connected to the end plate 211 by the fastener 213 respectively. Since the first mating part 2121 and the second mating part 2122 overlap with the end plate 211 in different directions, the first mating part 2121 and the second mating part 2122 can be subjected to force in different directions. This makes the force at the connection between the side plate 212 and the end plate 211 more uniform and improves the structural strength at the connection between the side plate 212 and the end plate 211. It can also improve the structural stability and mechanical strength of the multiple battery packs 22 after they are fixed together, improve the reliability and safety of the multiple battery packs 22, and reduce the safety hazards of the battery device 1000.

[0166] The fastener 213 can be a bolt, screw, or stud, which facilitates disassembly and assembly and ensures a firm and reliable connection between the side plate 212 and the end plate 211. This improves the structural strength of the connection between the side plate 212 and the end plate 211 and makes the connection between the side plate 212 and the end plate 211 adjustable, so that the connection between the side plate 212 and the end plate 211 can be finely adjusted according to actual needs. This ensures the structural stability and consistency of the multiple battery packs 22 after they are fixed together. Furthermore, based on ensuring assembly accuracy, it can reduce the accuracy requirements of the multiple battery packs 22 in the group fixing process and reduce the assembly cost of the battery device 1000. Alternatively, the ends of the side plate 212 can be connected using the FDS riveting (Flow Drill Screw) process, which can improve the structural strength of the connection between the side plate 212 and the end plate 211.

[0167] In some embodiments, please refer to Figures 5-9. The end plate 211 is provided with a relief groove 2111, and the first mating part 2121 is located in the relief groove 2111 and is fixedly connected to the end plate 211.

[0168] The end plate 211 may be provided with a clearance groove 2111 to avoid the first mating part 2121 at the end of the side plate 212, so that the first mating part 2121 can extend into the clearance groove 2111, and the part of the first mating part 2121 extending into the clearance groove 2111 can contact the groove wall of the clearance groove 2111, thereby limiting the first mating part 2121. This can achieve the positioning of the connection between the side plate 212 and the end plate 211, improve the accuracy of fixing multiple battery packs 22 in groups, facilitate operation, improve the structural stability and mechanical strength of multiple battery packs 22 after being fixed in groups, reduce the assembly cost of the battery device 1000, reduce the difficulty and risk of assembling the battery device 1000, and prevent the first mating part 2121 from protruding from the end plate 211, thereby reducing the space occupied by the end plate 211 and the entire battery device 1000 and saving space.

[0169] In some embodiments, referring to Figures 5, 10 and 11, a plurality of electrode assemblies 222 within each battery pack 22 are stacked in a first direction X, and each electrode assembly 222 is a solid electrode assembly 222.

[0170] The battery pack 22 includes multiple electrode components 222. For example, there may be several or dozens of electrode components 222. Of course, the battery pack 22 may also include more electrode components 222. Multiple electrode components 222 are stacked along the first direction X and can be electrically connected. It is understood that the specific number of electrode components 222 can be determined according to actual production requirements and is not specifically limited here.

[0171] Multiple electrode components 222 within each battery pack 22 can be stacked in the first direction X, allowing the battery pack 22 to extend along the first direction X. This enables the multiple battery packs 22 to fully utilize the space of the battery device 1000 in the first direction X, and allows the multiple battery packs 22 after being grouped together to be stacked and fixed in other directions (different from the first direction X), making more rational use of the space of the battery device 1000 and saving space.

[0172] Each electrode assembly 222 can be a solid-state electrode assembly 222, which can combine the functions of electrolyte and separator into one, significantly reducing the distance between the positive and negative electrodes, thereby reducing the thickness of the electrode assembly 222 and thus increasing the energy density of the electrode assembly 222. In addition, the solid electrolyte is non-fluid, which can realize series connection and voltage boosting within the electrode assembly 222, reducing the packaging cost of the electrode assembly 222 and increasing the volumetric energy density.

[0173] Furthermore, the electrode assembly 222 is the component in the battery pack 22 where the electrochemical reaction occurs. By placing the electrode assembly 222 inside the casing 221, it is beneficial to reduce the risk of harmful gas leakage, thereby reducing the risk of harmful gases posing a threat to human health. In addition, the casing 221 can protect multiple electrode assemblies 222, which is beneficial to improve the safety and reliability of the electrode assembly 222 and reduce the risk of damage to the electrode assembly 222 due to contact with dust or water and other debris.

[0174] In some examples, the first direction X is the thickness direction of the electrode assembly 222, and the first direction X is also the length direction of the housing 1. The thickness direction of the electrode assembly 222 is the minimum dimension direction of the electrode assembly 222, and the length direction of the housing 1 is the maximum dimension direction of the housing 1. By stacking multiple electrode assemblies 222 in the first direction X in each battery pack 22, more electrode assemblies 222 can be arranged in the housing 1, which is beneficial to improving the energy density of the battery device 1000.

[0175] In some examples, the wall surface with the largest area of ​​the electrode assembly 222 is perpendicular to the first direction X. Combined with the multiple electrode assemblies 222 stacked in the first direction X within each battery pack 22, when the electrode assembly 222 expands during charging and discharging, the expansion stress is evenly distributed to the adjacent electrode assemblies 222 in the first direction X, which can better resist the expansion of the electrode assembly 222 and improve the reliability of the battery device 1000.

[0176] In some embodiments, referring to Figures 10-12, each electrode assembly 222 includes two first sidewalls 2221 disposed opposite each other in a first direction X, two second sidewalls 2222 disposed opposite each other in a second direction Z, and two third sidewalls 2223 disposed opposite each other in a third direction Y. At least two of the first sidewalls 2221, second sidewalls 2222, and third sidewalls 2223 of each electrode assembly 222 are glued to the housing 221. The first direction X, the second direction Z, and the third direction Y intersect each other in pairs.

[0177] In the above technical solution, by adhesively bonding at least two intersecting sidewalls of the first sidewall 2221, the second sidewall 2222, and the third sidewall 2223 of each electrode assembly 222 to the outer casing 221, the connection strength between the electrode assembly 222 and the outer casing 221 is improved. This is beneficial to improving the assembly reliability of the electrode assembly 222, reducing the risk of the electrode assembly 222 shaking, thereby improving the rigidity of the battery pack 22, and also improving the reliability and safety of the battery pack 22.

[0178] In some examples, the casing 221 may be made of a material with a certain degree of hardness and strength (such as metal) to reduce the risk of deformation after the casing 221 is subjected to compression or impact, thereby allowing the battery pack 22 to have higher structural strength and improved reliability. The material of the casing 221 may include, but is not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, or plastic.

[0179] At least two intersecting sidewalls of the first sidewall 2221, second sidewall 2222, and third sidewall 2223 of each electrode assembly 222 are glued to the housing 221. For example, a first sidewall 2221 and a second sidewall 2222 of each electrode assembly 222 can be glued to a portion of the housing 221 opposite to it, or a second sidewall 2222 and a third sidewall 2223 of each electrode assembly 222 can be glued to a portion of the housing 221 opposite to it, or a first sidewall 2221 and a third sidewall 2223 of each electrode assembly 222 can be glued to a portion of the housing 221 opposite to it; thus, by making the first sidewall 2222 of each electrode assembly 222... 1. At least two intersecting sidewalls of the second sidewall 2222 and the third sidewall are glued to the outer casing. Since each electrode assembly 222 can be fixed on at least one side in different directions, the electrode assembly 222 can be constrained in multiple directions. This increases the connection area between each electrode assembly 222 and the outer casing 221, thereby improving the connection strength between each electrode assembly 222 and the outer casing 221. This improves the assembly reliability of each electrode assembly 222 and reduces the risk of the electrode assembly 222 shaking in the receiving cavity 111. This improves the reliability and safety of the battery pack 22. Furthermore, the glued fixing method can also provide sealing and moisture protection, which helps reduce the risk of harmful gas leakage or short circuit of the battery pack 22.

[0180] It is understood that the specific sidewalls of each electrode assembly 222 that are glued to the outer shell 221 and the specific number of corresponding sidewalls are merely examples for ease of understanding and should not be construed as limitations on this application. The specific sidewalls of each electrode assembly 222 that are glued to the outer shell 221 and the specific number of corresponding sidewalls can be determined according to actual production requirements and are not specifically limited here.

[0181] In some embodiments of this application, at least one second sidewall 2222 and at least one third sidewall 2223 of each electrode assembly 222 are glued to the housing 221.

[0182] In the above technical solution, by adhesively bonding at least one second sidewall 2222 and at least one third sidewall 2223 of each electrode assembly 222 to the housing 221, it is beneficial to constrain each electrode assembly 222 in the second direction Z and the third direction Y respectively, while also improving the connection strength between each electrode assembly 222 and the housing 221, thereby improving the stability of each electrode assembly 222 and reducing the risk of the electrode assembly 222 shaking.

[0183] Each electrode assembly 222 can have one second sidewall 2222 and one third sidewall 2223 glued to the housing 221 respectively, or each electrode assembly 222 can have two second sidewalls 2222 and one third sidewall 2223 glued to the housing 221 respectively, or each electrode assembly 222 can have two third sidewalls 2223 and one second sidewall 2222 glued to the housing 221 respectively.

[0184] Since multiple electrode assemblies 222 are stacked in the first direction X, the opposing first sidewalls 2221 of adjacent electrode assemblies 222 cannot be glued to the outer shell 221. Therefore, by gluing at least one second sidewall 2222 and at least one third sidewall 2223 of each electrode assembly 222 to the outer shell 221, even if both first sidewalls 2221 of the electrode assembly 222 cannot be glued to the outer shell 221 (for example, if the number of electrode assemblies 222 is greater than or equal to three, then the first sidewall 2221 of the middle electrode assembly 222 in the first direction X cannot be glued to the outer shell 221), the intersecting sidewalls of the electrode assemblies 222 can still be glued to the outer shell 221. This not only constrains each electrode assembly 222, but also helps to improve the connection strength between each electrode assembly 222 and the outer shell 221, thereby improving the stability of each electrode assembly 222 and reducing the risk of the electrode assembly 222 shaking.

[0185] In some embodiments of this application, the electrode assembly 222 is provided with a positive electrode tab and a negative electrode tab, which are led out from the same third sidewall 2223 of two third sidewalls 2223.

[0186] In the above technical solution, by having the positive and negative tabs lead out from the same third sidewall 2223, it is beneficial to simplify the structure of the battery pack 22, improve the convenience of production and assembly of the battery pack 22, and reduce the production cost of the battery pack 22.

[0187] When the positive and negative tabs are led out from the same third sidewall 2223, the sampling structure for collecting the tab voltage signal can be integrated with the busbar assembly, eliminating the need to set up a sampling structure on the tabless lead-out side of the electrode assembly 222. This simplifies the structure of the battery pack 22, improves the ease of production of the battery pack 22, and helps reduce the production cost of the battery pack 22.

[0188] Referring to Figure 5, in some embodiments of this application, the first sidewall 2221 of the outermost electrode assembly 222 located in the first direction X is glued to the housing 221.

[0189] In the above technical solution, by adhesively bonding the first sidewall 2221 of the outermost electrode assembly 222 in the first direction X to the housing 221, it is beneficial to improve the connection reliability and connection strength between the multiple electrode assemblies 222 and the housing 221, thereby further reducing the risk of the electrode assembly 222 shaking inside the housing 221, improving the reliability and safety of the battery pack 22, and also improving the rigidity of the battery pack 22.

[0190] Multiple electrode assemblies 222 are stacked in the first direction X, and the first sidewall 2221 of the outermost electrode assembly 222 in the first direction X is glued to the outer casing 221. In other words, the first sidewall 2221 of the electrode assembly 222 that is closest to the outer casing 221 in the first direction X is glued to the outer casing 221. This allows the entire assembly formed by the multiple electrode assemblies 222 to be glued and fixed to the outer casing 221 in the first direction X, which helps to improve the reliability and strength of the connection between the multiple electrode assemblies 222 and the outer casing 221. This further helps to reduce the risk of the electrode assembly 222 shaking inside the outer casing 221, improves the reliability and safety of the battery pack 22, and also helps to improve the rigidity of the battery pack 22.

[0191] In some embodiments, referring to Figures 10-12, in the second direction Z, the two second sidewalls 2222 of each electrode assembly 222 are glued to the housing 221.

[0192] In the above technical solution, by adhesively bonding both second sidewalls 2222 of each electrode assembly 222 to the outer casing 221, it is beneficial to further improve the connection strength between each electrode assembly 222 and the outer casing 221 in the second direction Z, thereby further improving the assembly reliability of the electrode assembly 222, reducing the risk of the electrode assembly 222 shaking, and thus further improving the reliability and safety of the battery pack 22.

[0193] Both second sidewalls 2222 of each electrode assembly 222 can be coated with adhesive so that both second sidewalls 2222 of each electrode assembly 222 are glued to the housing 221. Alternatively, the portion of the housing 221 opposite to the second sidewalls 2222 of the electrode assembly 222 in the second direction Z can be coated with adhesive so that both second sidewalls 2222 of each electrode assembly 222 are glued to the housing 221.

[0194] In some embodiments, please refer to Figures 10-12, the first sidewall 2221 is the sidewall with the largest area of ​​the electrode assembly 222.

[0195] In the above technical solution, since the first sidewall 2221 is the sidewall with the largest area of ​​the electrode assembly 222, and the first sidewall 2221 of the outermost electrode assembly 222 in the first direction X is glued to the outer shell 221, the connection area between the electrode assembly 222 and the outer shell 221 is increased, which helps to improve the connection strength between the electrode assembly 222 and the outer shell 221, and further helps to reduce the risk of the electrode assembly 222 shaking, so as to further improve the safety and reliability of the battery pack 22.

[0196] The electrode assembly 222 can be formed into a cuboid structure. Each electrode assembly 222 can be vertically arranged inside the housing 221, and the first sidewall 2221 of each electrode assembly 222 is arranged opposite to each other along the first direction X. The first sidewall 2221 of the outermost electrode assembly 222 in the first direction X is arranged opposite to the portion of the housing 221 in the first direction X and is glued to the housing 221. The first sidewall 2221 is the sidewall with the largest area of ​​the electrode assembly 222. By gluing the first sidewall 2221 to the housing 221, it is beneficial to increase the area that can be glued between the electrode assembly 222 and the housing 221, thereby increasing the area of ​​glued fixation between the electrode assembly 222 and the housing 221, that is, increasing the connection area between the electrode assembly 222 and the housing 221, thereby improving the connection strength between the electrode assembly 222 and the housing 221, and thus improving the stability of the electrode assembly 222.

[0197] In some embodiments, referring to Figures 13-16, an insulating component 223 is provided between the housing 221 and the plurality of electrode assemblies 222.

[0198] In the above technical solution, by setting an insulating component 223 between the outer casing 221 and multiple electrode components 222, the risk of short circuits or leakage problems caused by the outer casing 221 contacting the electrode components 222 or other metal parts during the operation of the battery pack 22 is reduced, which is beneficial to improving the safety of the battery pack 22.

[0199] In some examples, an insulating component 223 can be set between the housing 221 and multiple electrode components 222 by means of powder spraying, electrophoresis, film application, etc. The insulating component 223 can block unexpected conductive paths, thereby reducing the risk of short circuits or leakage during operation of the battery pack 22 due to contact between the housing 221 and the electrode components 222 or other metal parts, and improving the safety of the battery pack 22.

[0200] The specific process for processing the insulating component 223 can be determined based on the usage environment, temperature range, and electrical performance requirements of the battery pack 22. For example, when the battery pack 22 is used in a high humidity or high corrosive environment, electrophoresis or film coating processes can be used to process the insulating component 223 to improve its moisture-proof and corrosion-proof performance. When the battery pack 22 is used in a high temperature environment, powder coating processes can be used to process the insulating component 223. Powder coating is beneficial to improving the heat resistance and insulation of the insulating component 223.

[0201] The insulating component 223 can be made of polymer, ceramic or composite materials, etc. The specific material selection can be determined according to actual production requirements and is not specifically limited here.

[0202] In some embodiments, referring to Figures 13-16, the insulating component 223 includes an insulating coating 2231 sprayed onto the inner wall of the housing 221; and / or, the insulating component 223 includes an insulating sheet 2232 fixed between the electrode assembly 222 and the housing 221.

[0203] In the above technical solution, by including an insulating coating 2231 sprayed on the inner wall of the outer casing 221 in the insulating component 223, the insulating coating 2231 can completely cover the inner wall of the outer casing 221, which is beneficial to improving the insulation reliability of the insulating component 223 and reducing the risk of displacement or detachment of the insulating component 223, thus improving the long-term reliability of the insulating component 223. By including an insulating sheet 2232 fixed between the electrode component 222 and the outer casing 221 in the insulating component 2233, the insulating sheet 2232 is easy to assemble, which can effectively improve the production and assembly efficiency of the battery pack 22. Furthermore, the insulating sheet 2232 can play a role in buffering and reducing wear, which is beneficial to improving the service life and safety of the battery pack 22.

[0204] In some examples, the insulating component 223 includes an insulating coating 2231 sprayed onto the inner wall of the housing 221. Since the insulating coating 2231 is thin, it can effectively reduce the space occupied by the insulating component 223 in the housing 221, thus saving more installation space for the electrode assembly 222. At the same time, since the insulating coating 2231 can form a continuous and complete insulating film on the inner wall of the housing 221, it can effectively reduce the risk of leakage protection and improve the insulation reliability of the insulating component 223. Furthermore, the insulating coating 2231 has a low risk of falling off from the housing 221, which is beneficial to improving the long-term insulation stability of the insulating component 223.

[0205] In other examples, the insulating component 223 includes an insulating sheet 2232 fixed between the electrode assembly 222 and the housing 221. The insulating sheet 2232 can be clamped and fixed by the electrode assembly 222 and the housing 221, or the insulating sheet 2232 can be fixed between the electrode assembly 222 and the housing 221 by adhesive or fixed mounting structure. The insulating sheet 2232 is easy to install and remove, which helps to improve the assembly and maintenance convenience of the battery pack 22. At the same time, the insulating sheet 2232 can act as a buffer between the electrode assembly 222 and the housing, reducing the damage to the electrode assembly 222 caused by mechanical collision. The insulating sheet 2232 can also reduce the wear between the electrode assembly 222 and the housing, which helps to improve the service life of the battery pack 22.

[0206] In some other examples, the insulating component 223 includes an insulating coating 2231 sprayed onto the inner wall of the housing 221, and an insulating sheet 2232 fixed between the electrode assembly 222 and the housing 221 to improve the insulation effect of the insulating component 223, further improve the safety of the battery pack 22, and at the same time enable the insulating component 223 to have a buffering function, thereby improving the functionality of the insulating component 223.

[0207] In some embodiments, please refer to Figures 13-16, an insulating sheet 2232 is provided between the first sidewall 2221 and the outer casing 221.

[0208] In the above technical solution, by providing an insulating sheet 2232 between the first sidewall 2221 and the outer casing 221, the risk of electrical short circuit or leakage caused by contact between the electrode assembly 222 and the outer casing 221 is reduced. At the same time, the space occupied by the insulating assembly 223 in the second direction Z can be reduced, which is conducive to reducing the size of the battery pack 22 in the second direction Z, and further conducive to reducing the arrangement space required for the battery pack 22 in the second direction Z.

[0209] An insulating sheet 2232 is provided between the first sidewall 2221 of the outermost electrode assembly 222 and the outer casing 221. On one hand, the insulating sheet 2232 can isolate the electrode assembly 222 from the casing 221 at the end of the assembly formed by the multiple electrode assemblies 222, reducing the risk of leakage or short circuits in the battery pack 22 due to contact between the electrode assembly 222 and the casing 221, thus improving the safety of the battery pack 22. On the other hand, considering the limited space in the second direction Z of the battery pack 22, if an insulating sheet 2232 is provided between the second sidewall 2222 and the casing 221... If the insulating sheet 2232 encroaches on the space in the outer casing 221 used for arranging the electrode assembly 222, it will affect the performance of the battery pack 22. Therefore, by setting the insulating sheet 2232 between the first sidewall 2221 and the outer casing 221, not only can the insulation effect between the electrode assembly 222 and the outer casing 221 be guaranteed, but the encroachment of the insulating sheet 2232 on the space in the outer casing 221 used for arranging the electrode assembly 222 can also be reduced, which is beneficial to improving the performance of the battery pack 22. At the same time, the size of the battery pack 22 in the second direction Z can be reduced, so as to reduce the arrangement space required for the battery pack 22 in the second direction Z.

[0210] In some examples, the insulating sheet 2232 can be made of high-strength, high-insulation materials, such as polyester film or polyimide film, to improve the temperature resistance and compressive strength of the insulating sheet 2232, so that the insulating sheet 2232 can meet the operating requirements of the battery pack 22 under different operating conditions.

[0211] In some embodiments, referring to FIG16, a flexible first buffer 224 is provided between the first sidewall 2221 and the outer shell 221.

[0212] In the above technical solution, a flexible first buffer 224 is provided between the first sidewall 2221 and the outer shell 221 to alleviate the impact force on the electrode assembly 222 during the installation into the outer shell 221, thereby reducing the risk of deformation or damage to the electrode assembly 222 due to external impact or uneven force.

[0213] Considering that the electrode assembly 222 may collide with the housing 221 when it is installed in the housing 221, a first buffer 224 can be provided between the first sidewall 2221 of the outermost electrode assembly 222 and the housing 221. The first buffer 224 can absorb the impact force, thereby effectively reducing the risk of damage to the electrode assembly 222.

[0214] The first buffer 224 is first positioned inside the outer shell 221. After the electrode assembly 222 is installed inside the outer shell 221, the first buffer 224 is clamped and fixed by the electrode assembly 222 and the outer shell 221. Alternatively, the first buffer 224 can be fixed to the first side wall 2221 and the outer shell 221 by adhesive. For example, adhesive can be applied to the outer wall of the first buffer 224, and the first buffer 224 can be first bonded to the first side wall 2221 of the outermost electrode assembly 222 among the multiple electrode assemblies 222. After the electrode assembly 222 is installed inside the outer shell 221, the first buffer 224 is bonded and fixed to the outer shell 221.

[0215] In some embodiments, referring to FIG16, the first buffer 224 is formed as an insulating material.

[0216] In the above technical solution, by making the first buffer 224 an insulating material, the insulation effect between the electrode assembly 222 and the outer shell 221 is further improved, thereby helping to further reduce the risk of electrical short circuit or leakage caused by the contact between the electrode assembly 222 and the outer shell 221, and improving the safety of the battery pack 22.

[0217] In some examples, the first buffer 224 can be formed as a silicone part, an EVA (ethylene-vinyl acetate copolymer) part, or an EPDM (ethylene propylene diene monomer rubber) part, so that the first buffer 224 can not only have insulation, but also high elasticity and high temperature resistance, thereby improving the buffering effect of the first buffer 224 on impact force, and at the same time making the first buffer 224 suitable for the high temperature conditions of the battery pack 22.

[0218] It is understood that the material of the first buffer 224 mentioned above is only an example for ease of understanding and should not be construed as a limitation of this application. The first buffer 224 can also be configured with other materials, and its specific material settings can be determined according to actual production requirements, without specific limitations here.

[0219] In some embodiments, referring to Figures 8, 9, 13 and 15, a second buffer 225 is provided between adjacent electrode assemblies 222.

[0220] In the above technical solution, by setting a second buffer 225 between adjacent electrode components 222, the risk of adjacent electrode components 222 coming into contact with each other is reduced. At the same time, the second buffer 225 can play a buffering and shock-absorbing role between adjacent electrode components 222, reducing the risk of the electrode components 222 shaking or being damaged. In addition, the second buffer 225 can also improve the heat conduction efficiency between adjacent electrode components 222, thereby improving the thermal management performance of the battery pack 22.

[0221] Multiple electrode assemblies 222 are stacked along the first direction X. A second buffer 225 is provided between every two adjacent electrode assemblies 222. The second buffer 225 can clamp and fix the two adjacent electrode assemblies 222 to prevent the adjacent electrode assemblies 222 from contacting each other, thereby reducing the risk of short circuit in the battery pack 22. At the same time, the second buffer 225 can also play a role in heat insulation to reduce heat transfer between adjacent electrode assemblies 222, thereby helping to reduce the risk of thermal runaway of the entire battery pack 22 due to overheating in a single area. In addition, the second buffer 225 can buffer and dampen vibration between two adjacent electrode assemblies 222 to reduce the risk of displacement of the electrode assemblies 222 due to vibration, compression or thermal expansion and contraction, thereby improving the stability of the electrode assemblies 222 and thus improving the stability and safety of the battery pack 22.

[0222] In some embodiments, referring to Figures 8, 9, 13 and 15, the second buffer 225 is glued to the adjacent electrode assembly 222.

[0223] In the above technical solution, by adhesively fixing the second buffer 225 to the adjacent electrode assembly 222, the assembly reliability between the second buffer 225 and the electrode assembly 222 is improved, and the risk of failure of the second buffer 225 due to detachment is reduced.

[0224] In the first direction X, the two sides of the second buffer 225 that are opposite to the electrode assembly 222 can be coated with adhesive, so that the second buffer 225 can be glued and fixed to the adjacent electrode assembly 222 respectively, thereby improving the assembly reliability between the second buffer 225 and the electrode assembly 222 and reducing the risk of the second buffer 225 falling off. This ensures the reliability of the second buffer 225 in separating the two adjacent electrode assemblies 222, the heat insulation effect of the second buffer 225, and the effect of the second buffer 225 in preventing the electrode assembly 222 from shifting. This is beneficial to improving the safety and reliability of the battery pack 22.

[0225] In some embodiments, each electrode assembly 222 is disposed within a packaging bag.

[0226] In the above technical solution, by placing each electrode assembly 222 inside the encapsulation bag, the encapsulation bag can serve as an insulating barrier, thereby reducing the risk of short circuits caused by contact between the electrode assembly 222 and the outer casing 221. On the other hand, the harmful gases generated by the electrode assembly 222 can be sealed inside the encapsulation bag, further reducing the risk of harmful gas leakage, which is beneficial to further reducing the risk of harmful gases posing a threat to human health and improving the reliability of the battery pack 22. Alternatively, by making each electrode assembly 222 unencapsulated and directly housed inside the outer casing 221, the space inside the outer casing 221 that can be used to arrange the electrode assembly 222 is increased, allowing the battery pack 22 to have a higher energy density while reducing the production cost of the battery pack 22.

[0227] In some examples, each electrode assembly 222 is disposed within a packaging bag to form a battery cell, which is housed within a housing 221; wherein the packaging bag can be a flexible housing 221, such as aluminum-plastic film, heat-shrink film, etc.

[0228] After the electrode assembly 222 is encapsulated in packaging bags, multiple packaging bags are then housed within the outer casing 221. On one hand, the packaging bags serve as insulation, further reducing the risk of short circuits caused by contact between the electrode assembly 222 and the outer casing 221, thus improving the safety of the battery pack 22. On the other hand, harmful gases generated by the electrode assembly 222 can be sealed within the packaging bags. Even if harmful gases leak from the packaging bags, the outer casing 221 can further seal them, further reducing the risk of leakage and thus further reducing the risk of harmful gases posing a health hazard to humans, thereby improving the reliability of the battery pack 22.

[0229] It should be noted that after the electrode assembly 222 is encapsulated in the packaging bag, the packaging bag can be glued to the outer shell 221 to improve the connection strength between the electrode assembly 222 and the outer shell 221.

[0230] In other embodiments of this application, each electrode assembly 222 is not encapsulated and is directly housed within the housing 221. That is, the battery pack 22 can omit the encapsulation bag for the electrode assembly 222 to reduce the space occupied by the housing 221, thereby increasing the space available for arranging the electrode assembly 222 within the housing 221, so that the battery pack 22 can have a higher energy density.

[0231] In some embodiments, referring to FIG16, the housing 221 includes: a first wall portion 2211 and a second wall portion 2212, the first wall portion 2211 and the second wall portion 2212 being disposed opposite to each other in a first direction X; a third wall portion 2213 and a fourth wall portion 2214, the third wall portion 2213 and the fourth wall portion 2214 being disposed opposite to each other in a second direction Z; the first wall portion 2211, the third wall portion 2213 and the fourth wall portion 2214 are integral parts, the second wall portion 2212 is fixed to the third wall portion 2213 and the fourth wall portion 2214 respectively, the first wall portion 2211 and the second wall portion 2212 are respectively glued to the corresponding first sidewall 2221, and at least one of the third wall portion 2213 and the fourth wall portion 2214 is glued to a plurality of electrode assemblies 222.

[0232] In the above technical solution, by forming the first wall portion 2211, the third wall portion 2213, and the fourth wall portion 2214 into a single piece, it is beneficial to simplify the assembly process of the battery pack 22 and improve the production and assembly efficiency of the battery pack 22. By bonding the first wall portion 2211 and the second wall portion 2212 to the corresponding first side wall 2221 respectively, and bonding at least one of the third wall portion 2213 and the fourth wall portion 2214 to the multiple electrode assemblies 222, it is beneficial to improve the connection strength between the outer shell 221 and the electrode assembly 222, reduce the risk of the electrode assembly 222 shaking, and improve the rigidity of the battery pack 22.

[0233] The first wall portion 2211, the third wall portion 2213, and the fourth wall portion 2214 can be formed by bending the same plate. In other words, the plate is bent to form a U-shaped structural component. The two opposite parts of the plate in the first direction X are defined as the third wall portion 2213 and the fourth wall portion 2214, respectively. The part connecting the third wall portion 2213 and the fourth wall portion 2214 in the second direction Z is defined as the first wall portion 2211. Thus, by bending the plate to form the first wall portion 2211, the second wall portion 2212, and the fourth wall portion 2214, the assembly process of the outer casing 221 can be effectively simplified, and the production and assembly efficiency of the battery pack 22 can be improved.

[0234] The second wall portion 2212 is disposed opposite to the first wall portion 2211 in the first direction X, and is fixed to the third wall portion 2213 and the fourth wall portion 2214 respectively in the second direction Z. The first wall portion 2211 and the second wall portion 2212 are respectively disposed opposite to the first side wall 2221 of the outermost electrode assembly 222 in the first direction X and are glued and fixed, so that the housing 221 can limit the overall structure formed by the multiple electrode assemblies 222 in the first direction X, thereby reducing the risk of the electrode assembly 222 shaking or shifting in the first direction X, improving the stability of the electrode assembly 222, and thus improving the safety and reliability of the battery pack 22.

[0235] At least one of the third wall portion 2213 and the fourth wall portion 2214 is glued to the plurality of electrode assemblies 222. For example, the third wall portion 2213 can be glued to the second sidewall 2222 of the plurality of electrode assemblies 222 that is disposed opposite to it, or the fourth wall portion 2214 can be glued to the second sidewall 2222 of the plurality of electrode assemblies 222 that is disposed opposite to it, or the third wall portion 2213 and the fourth wall portion 2214 can be glued to the second sidewall 2222 of the plurality of electrode assemblies 222 respectively, so that the housing 221 can further limit the electrode assembly 222, thereby further reducing the risk of the electrode assembly 222 shaking or shifting in the first direction X, further improving the stability of the electrode assembly 222, and thus helping to further improve the safety and reliability of the battery pack 22.

[0236] In some specific embodiments, the integral piece formed by the first wall portion 2211, the third wall portion 2213 and the fourth wall portion 2214 can be supported by a metal material (such as aluminum alloy or stainless steel) to improve the structural strength and thermal conductivity of the housing 221. This can improve the protective effect of the housing 221 on the electrode assembly 222 while improving the heat dissipation effect of the battery pack 22, thereby further improving the safety of the battery pack 22.

[0237] In some embodiments, referring to FIG16, the housing 221 further includes a fifth wall portion 2215 and a sixth wall portion 2216, which are disposed opposite to each other in a third direction Y. The third direction Y intersects with the first direction X and the second direction Z, respectively. The fifth wall portion 2215 is provided with a first lead-out portion and a second lead-out portion, which have opposite polarities. The first lead-out portion is electrically connected to a plurality of electrode assemblies 222, and the second lead-out portion is electrically connected to a plurality of electrode assemblies 222.

[0238] It should be noted that "third direction Y" can be understood as the length direction of battery pack 22, or as the front-to-back direction. For a specific direction illustration, please refer to Figure 16.

[0239] In the above technical solution, by providing a first lead-out portion and a second lead-out portion on the fifth wall portion 2215, the convergence of multiple electrode assemblies 222 can be realized.

[0240] The fifth wall portion 2215 can be fixed to one side of the third wall portion 2213 and the fourth wall portion 2214 in the third direction Y, and the sixth wall portion 2216 can be fixed to the other side of the third wall portion 2213 and the fourth wall portion 2214 in the third direction Y. Thus, the first wall portion 2211, the second wall portion 2212, the third wall portion 2213, the fourth wall portion 2214, the fifth wall portion 2215 and the sixth wall portion 2216 together enclose and form the outer shell 221, and form a closed receiving cavity inside the outer shell 221, so as to improve the protective capability of the outer shell 221 for the electrode assembly 222 disposed therein, and help reduce the risk of harmful gas leakage from the outer shell 221.

[0241] The battery pack 22 may include an electrical output module. A portion of the electrical output module may be disposed between the fifth wall portion 2215 and the electrode assembly 222. The electrical output module may include an output electrode assembly, an insulating plate, and a busbar assembly. The insulating plate is disposed between the fifth wall portion 2215 and the electrode assembly 222, and the busbar assembly is disposed on the insulating plate and electrically connected to multiple electrode assemblies 222 to achieve current convergence of multiple electrode assemblies 222. The output electrode assembly includes a first lead and a second lead, which are disposed on the fifth wall portion 2215. The first lead and the second lead have opposite polarities and are electrically connected to the busbar assembly respectively. One of the first lead and the second lead can serve as the positive output terminal of the battery pack 22, and the other can serve as the negative output terminal of the battery pack 22. Both are electrically connected to external electrical connection components to output electrical energy to the battery pack 22 or input electrical energy to the battery pack 22.

[0242] The assembly process of the battery pack 22 according to an embodiment of this application will be briefly described below with reference to FIG16.

[0243] First, multiple electrode assemblies 222 are stacked in the first direction X at the front edge of the housing 221. The second sidewall 2222 of each electrode assembly 222 and the first sidewall 2221 of the outermost electrode assembly 222 in the first direction X are coated with adhesive. After the adhesive is applied, the entire assembly formed by the multiple electrode assemblies 222 can be glued to the integral part formed by the first wall portion 2211, the third wall portion 2213 and the fourth wall portion 2214. The second sidewall 2222 is glued and fixed to the third wall portion 2213 and the fourth wall portion 2214 respectively, and the first sidewall 2221 can be glued and fixed to the first wall portion 2211.

[0244] Among them, the adhesive can be a special adhesive with good adhesion, high temperature resistance and corrosion resistance to improve the connection reliability between the electrode assembly 222 and the shell 221 and reduce the risk of loosening or falling off between the electrode assembly 222 and the shell 221 during long-term use of the battery pack 22. The adhesive application process must be strictly carried out in accordance with the process parameters to ensure that the adhesive layer is uniform and free of bubbles, and to avoid the decrease in bonding strength or failure to meet the sealing standards due to uneven adhesive layer.

[0245] During the bonding process, the integral piece formed by the first wall portion 2211, the third wall portion 2213, and the fourth wall portion 2214 contacts and fits against the electrode assembly 222 to improve the bonding effect and thermal conductivity. Furthermore, pressure is applied at the bonding location to enhance the adhesion between the electrode assembly 222 and the housing 221. After bonding, the bonded area is cured to allow the adhesive to fully cure, improving the stability and durability of the bond.

[0246] After bonding the electrode assembly 222 to the integrated component, the second wall portion 2212 can be further welded or bonded to the integrated component. Then, the sixth wall portion 2216 can be positioned and fixed to the integrated component. To improve the connection strength and sealing performance between the sixth wall portion 2216 and the integrated component, adhesive can be applied again between them to enhance the connection strength. After bonding the sixth wall portion 2216 to the integrated component, a curing treatment is performed at the connection point to improve the reliability of the connection. Alternatively, the sixth wall portion 2216 can also be fixedly connected to the integrated component by welding to improve the connection strength and sealing performance.

[0247] After completing the connection between electrode assembly 222, the integral part, and the sixth wall portion 2216, the fifth wall portion 2215 is further welded to the front opening of the integral part. During the welding process, a specific welding method can be selected according to actual production requirements, such as laser welding, resistance welding, or arc welding, to improve the connection strength and quality between the fifth wall portion 2215 and the integral part. Welding parameters (such as current, voltage, and welding speed) should be optimized according to material properties and structural requirements to ensure that the welding quality meets design standards.

[0248] After welding, the battery pack 22 needs to be inspected and tested. The inspection includes, but is not limited to, weld quality, bond strength, sealing performance, and overall structural stability. For weld quality, non-destructive testing methods such as ultrasonic testing or X-ray inspection can be used to ensure the weld is free of defects such as cracks and porosity. For bond strength, tensile or shear tests can be performed to ensure the bonded areas maintain good adhesion under stress. Sealing performance can be tested using airtightness or hydrostatic testing to ensure that the battery pack 22 will not leak or become waterlogged during use. The stability of the battery pack 22 can be evaluated through vibration testing, impact testing, and high / low temperature cycling testing to ensure that the battery pack 22 can operate normally under various environmental conditions.

[0249] After all inspections and tests are completed, the battery pack 22 can proceed to the next process or undergo packaging. During the packaging process, the battery pack 22 can be encapsulated with a shell 221, and heat dissipation design and electrical connection can be carried out according to the usage requirements of the battery pack 22, further improving the performance and safety of the battery pack 22.

[0250] In summary, by applying adhesive to the first sidewall 2221 and the second sidewall 2222 of the electrode assembly 222, the electrode assembly 222 is bonded to the outer casing 221. Then, the integral component is connected to the second wall portion 2212, the fifth wall portion 2215, and the sixth wall portion 2216, respectively, ultimately forming a battery pack 22 with a stable structure, good sealing, and excellent conductivity. This not only improves the manufacturing efficiency of the battery pack 22 but also enhances its overall performance and reliability.

[0251] In some embodiments, referring to FIG16, the fifth wall portion 2215 is provided with two first through holes 2217 and a support portion 2218. The support portion 2218 is disposed outside the housing 221 and located on one side of the first through hole 2217. The first lead-out portion and the second lead-out portion respectively pass through the corresponding first through hole 2217 and are supported and fixed by the support portion 2218.

[0252] In the above technical solution, by providing two first through holes 2217 on the fifth wall portion 2215, the first lead-out portion and the second lead-out portion can extend out from the outer casing 221, thereby facilitating the electrical connection between the first lead-out portion and the second lead-out portion and the external electrical connection component, and facilitating the output of electrical energy of the battery pack 22 or the input of electrical energy to the battery pack 22; by providing a support portion 2218 to support and fix the first lead-out portion and the second lead-out portion, it is beneficial to improve the stability of the first lead-out portion and the second lead-out portion, thereby improving the stability of the electrical connection between the first lead-out portion and the second lead-out portion and the external electrical connection component.

[0253] The fifth wall portion 2215 may be provided with two first through holes 2217 that pass through it in the third direction Y. The two first through holes 2217 may be arranged at intervals in the first direction X. The first lead-out portion may extend out of the housing 221 through one of the two first through holes 2217, and the second lead-out portion may extend out of the housing 221 through the other of the two first through holes 2217, thereby facilitating connection with external electrical connection components.

[0254] The fifth wall portion 2215 is also provided with a support portion 2218. The support portion 2218 can be provided on the side of the fifth wall portion 2215 facing away from the electrode assembly 222 in the third direction Y. The support portion 2218 can be provided opposite to the first through hole 2217 in the second direction Z and located below the first through hole 2217. After the first lead-out portion and the second lead-out portion extend out of the housing 221, the support portion 2218 can support and fix the first lead-out portion and the second lead-out portion below, so as to reduce the risk of the first lead-out portion and the second lead-out portion shaking or bending, thereby improving the stability of the first lead-out portion and the second lead-out portion, and further improving the stability of the electrical connection between the first lead-out portion and the second lead-out portion and the external electrical connection component.

[0255] In some embodiments, referring to FIG16, each support portion 2218 includes a sub-support body 22181 spaced apart in a first direction X, and each sub-support body 22181 includes a support arm disposed opposite to the fifth wall portion 2215 in a third direction Y.

[0256] In the above technical solution, by designing the support part 2218, on the one hand, the material used in the support part 2218 can be reduced, thereby reducing the material cost of the battery pack 22; on the other hand, the support and fixing effect of the support part 2218 can be improved, thereby improving the stability of the electrical connection of the battery pack 22.

[0257] Each support portion 2218 includes two sub-support bodies 22181 that are opposite to and spaced apart in the first direction X. Each sub-support body 22181 includes a portion extending in the third direction Y and a portion extending in the first direction X (i.e., a support arm). One end of the portion of the sub-support body 22181 extending in the third direction Y is connected to the fifth wall portion 2215, and the other end is connected to the portion extending in the first direction X. In short, in the projection plane in the second direction Z, the projection plane of each sub-support body 22181 is L-shaped, and the L-shaped openings of the two sub-support bodies 22181 of each support portion 2218 open towards each other. Since the support portion 2218 is not formed as a solid boss structure, but is composed of two support arms with L-shaped projection planes, the material used in the support portion 2218 can be effectively reduced, the material cost of the support portion 2218 can be reduced, and thus the production cost of the battery pack 22 can be reduced.

[0258] For ease of explanation, the first lead-out portion is described using the support portion 2218 as an example. When the first lead-out portion extends out of the housing 221 through the first through hole 2217, the fifth wall portion 2215 can support one end of the first lead-out portion in the third direction Y. Since each support portion 2218 includes two support arms that are arranged opposite to the fifth wall portion 2215 in the third direction Y, and the two support arms are arranged opposite to each other in the first direction X, the support arms can support the other end of the first lead-out portion to reduce the risk of the first lead-out portion falling off between the two sub-support bodies 22181 and to improve the stability of the first lead-out portion.

[0259] In some embodiments, referring to FIG16, the sixth wall portion 2216 is provided with an explosion-proof valve, which is configured to vent air outward under set conditions.

[0260] In the above technical solution, by setting an explosion-proof valve in the sixth wall 2216, on the one hand, the space on the shell can be reasonably allocated, which is conducive to the miniaturization design of the battery pack 22. On the other hand, when the battery pack 22 experiences thermal runaway or short circuit, a large amount of gas generated inside the shell 221 can be discharged through the explosion-proof valve, thereby reducing the risk of shell 221 rupture or explosion and improving the safety of the battery pack 22.

[0261] The sixth wall portion 2216 is provided with a valve body mounting hole 2219 that extends through it in a third direction Y. The explosion-proof valve can be installed on the sixth wall portion 2216 through the valve body mounting hole 2219 and communicate with the inside of the outer casing 221. When the battery pack 22 experiences thermal runaway or short circuit, a large amount of gas will be generated inside the outer casing 221. When a preset condition is reached, such as the gas pressure inside the outer casing 221 reaching a set value or the temperature inside the outer casing 221 rising to a critical value, the explosion-proof valve will open, and the gas can be discharged through the explosion-proof valve to reduce the risk of the outer casing 221 rupturing or even the battery pack 22 exploding due to the continuous accumulation of gas inside the outer casing 221, thereby improving the safety of the battery pack 22.

[0262] Considering that the first wall portion 2211 to the fourth wall portion 2214 are all used for bonding and fixing with the electrode assembly 222, and the fifth wall portion 2215 is used to set the first lead-out portion and the second lead-out portion, an explosion-proof valve can be set on the sixth wall portion 2216. This way, it will not interfere with the bonding and fixing of the outer shell 221 and the electrode assembly 222, nor will it cause the explosion-proof valve to encroach on the arrangement space of the first lead-out portion and the second lead-out portion, so as to achieve a reasonable allocation of space on the outer shell 221.

[0263] Secondly, embodiments of this application provide an electrical device 2000, including a battery device 1000 as described in the first aspect.

[0264] In the above technical solution, the battery device 1000 has good temperature control capability, which can meet the requirements of the battery device 1000 for high-power fast charging and extreme environment, and is conducive to improving the applicability and reliability of the power device 2000.

[0265] Please refer again to Figures 2-16 to describe the battery device 1000 of a specific embodiment of this application. The battery device 1000 includes: a housing 1, two battery modules 2, two heat exchange components 5, and a pressure plate 3. The first direction X is the front-back direction of the battery device 1000, the second direction Z is the up-down direction of the battery device 1000, and the third direction Y is the left-right direction of the battery device 1000.

[0266] Two battery modules are housed inside the housing 1. The battery module 2 includes a fixed frame 21 and multiple battery packs 22 housed within the fixed frame 21. The fixed frame 21 is glued to the housing 1. Each battery pack 22 includes a housing 221 and multiple electrode assemblies 222 housed within the housing 221. Each electrode assembly 222 is a solid electrode assembly 222. Each electrode assembly 222 is unencapsulated and directly housed within the housing 221.

[0267] Multiple electrode assemblies 222 within each battery pack 22 are stacked in the first direction X. Each electrode assembly 222 includes two first sidewalls 2221 arranged opposite each other in the first direction X and two second sidewalls 2222 arranged opposite each other in the second direction Z. The first sidewalls 2221 are the sidewalls with the largest area of ​​the electrode assembly 222. The two second sidewalls 2222 of each electrode assembly 222 are glued to the outer casing 221. The first sidewall 2221 of the outermost electrode assembly 222 in the first direction X is glued to the outer casing 221.

[0268] An insulating component 223 is provided between the outer casing 221 and multiple electrode assemblies 222. The insulating component 223 includes an insulating coating 2231 and an insulating sheet 2232. An insulating sheet 2232 is provided between the first sidewall 2221 and the outer casing 221, and an insulating coating 2231 is provided between the second sidewall 2222 and the outer casing 221. A flexible first buffer 224 is also provided between the first sidewall 2221 and the outer casing 221. The first buffer 224 is formed as an insulating material. A second buffer 225 is provided between adjacent electrode assemblies 222. The second buffer 225 is glued and fixed to the adjacent electrode assemblies 222 respectively.

[0269] The outer casing 221 includes a first wall portion 2211, a second wall portion 2212, a third wall portion 2213, a fourth wall portion 2214, a fifth wall portion 2215, and a sixth wall portion 2216. The first wall portion 2211 and the second wall portion 2212 are arranged opposite each other in a first direction X, and the third wall portion 2213 and the fourth wall portion 2214 are arranged opposite each other in a second direction Z. The first wall portion 2211, the third wall portion 2213, and the fourth wall portion 2214 are integrally formed. The second wall portion 2212 is fixed to the third wall portion 2213 and the fourth wall portion 2214 respectively. The first wall portion 2211 and the second wall portion 2212 are respectively glued to the corresponding first sidewall 2221. Multiple electrode assemblies 222 are glued to both the third wall portion 2213 and the fourth wall portion 2214. The fifth wall portion 2215 and the sixth wall portion 2216 are arranged opposite each other in a third direction Y. Part 2215 is provided with a first lead-out part and a second lead-out part, the polarities of the first lead-out part and the second lead-out part are opposite. The first lead-out part is electrically connected to a plurality of electrode assemblies 222, and the second lead-out part is electrically connected to a plurality of electrode assemblies 222. The fifth wall part 2215 is provided with two first through holes 2217 and a support part 2218. The support part 2218 is located outside the housing 221 and on one side of the first through hole 2217. The first lead-out part and the second lead-out part are respectively passed through the corresponding first through holes 2217 and supported and fixed by the support part 2218. Each support part 2218 includes a sub-support body 22181 arranged at intervals in the first direction X. Each sub-support body 22181 includes a support arm arranged opposite to the fifth wall part 2215 in the third direction Y. The sixth wall part 2216 is provided with an explosion-proof valve, which is configured to vent outward under set conditions.

[0270] The fixed frame 21 includes an end plate 211 and a side plate 212. In the first direction X, each side of the plurality of battery packs 22 is provided with an end plate 211, and each end plate 211 is fixedly connected to the outermost battery pack 22. In the second direction Z, each side of the plurality of battery packs 22 is provided with a side plate 212, and each side plate 212 is fixedly connected to the end plates 211 on both sides respectively. The side plate 212 has a first mating part 2121 and a second mating part 2122. In the first direction X, the first mating part 2121 overlaps with the end plate 211 and is fixedly connected by a fastener 213. In the second direction Z, the second mating part 2122 overlaps with the end plate 211 and is fixedly connected by a fastener 213. The end plate 211 is provided with a clearance groove 2111, and the first mating part 2121 is located in the clearance groove 2111 and is fixedly connected to the end plate 211.

[0271] Each battery module 2 is provided with a heat exchange component 5. The heat exchange component 5 is glued to the fixed frame 21. Each heat exchange component 5 includes two heat exchange elements 51. In the second direction Z, the heat exchange element 51 away from the housing 1 is the first heat exchange element 511, and the heat exchange element 51 adjacent to the housing 1 is the second heat exchange element 512. The two heat exchange elements 51 are respectively provided on the two side plates 212 of the corresponding fixed frame 21. The heat exchange element 51 is a heating film. Multiple heating films of each heat exchange component 5 are connected in series, and the two heat exchange components 5 are connected in series.

[0272] Multiple battery packs 22 of each battery module 2 are arranged along the first direction X, and two battery modules 2 are arranged along the third direction Y. A pressure plate 3 is set for each of the two battery modules 2. The pressure plate 3 is glued to two adjacent fixed frames 21 through the first adhesive layer 6. The first adhesive layer 6 is provided with a clearance space 62, and the first heat exchanger 511 is located in the clearance space 62.

[0273] According to the battery device 1000 of this application embodiment, the heat exchange component 5 can cool / heat each battery pack 22, thereby achieving temperature control of each battery pack 22 and thus temperature control of the battery device 1000 to meet the requirements of the battery device 1000 for high-power fast charging and extreme environments. Furthermore, the largest wall surface of the outer casing 221 of each battery pack 22 (in other words, the large surface of each battery pack 22) exchanges heat with the heat exchange component 5, increasing the contact area between the battery pack 22 and the heat exchange component 5, resulting in more uniform heat transfer, avoiding localized overheating or overcooling, reducing the internal temperature gradient of the battery device 1000, and eliminating the need for a separate heat exchange component 5 for each battery pack 22, thus reducing the number of heat exchange components 5 and lowering the manufacturing cost of the battery device 1000.

[0274] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0275] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery device, characterized in that, include: Box; A battery module, wherein the battery module is disposed within the housing, the battery module comprising a plurality of battery packs arranged along a first direction, each battery pack comprising a housing and a plurality of electrode assemblies disposed within the housing; A heat exchange assembly is disposed on at least one side of the battery module in a second direction and extends to each of the battery modules in a first direction. The wall surface with the largest area of ​​the outer casing of each battery module faces the heat exchange assembly and exchanges heat with the heat exchange assembly.

2. The battery device according to claim 1, characterized in that, The heat exchange assembly includes multiple heat exchange elements, and the battery module has heat exchange elements on both sides in the second direction.

3. The battery device according to claim 2, characterized in that, Each of the heat exchangers is a heating film.

4. The battery device according to claim 3, characterized in that, The heat exchange assembly comprises multiple heating films connected in series.

5. The battery device according to claim 4, characterized in that, The battery device includes multiple battery modules and multiple heat exchange components. Each battery module is provided with a corresponding heat exchange component, and the multiple heat exchange components are connected in series.

6. The battery device according to claim 2, characterized in that, The battery module also includes a fixed frame, within which multiple battery packs are disposed, and the heat exchange component is disposed within the fixed frame.

7. The battery device according to claim 6, characterized in that, The fixed frame includes a first side plate and a second side plate arranged opposite to each other. The first side plate is fixed to the bottom wall of the box body, and both the first side plate and the second side plate are provided with the heat exchange element.

8. The battery device according to claim 6, characterized in that, The heat exchange component is glued and fixed to the fixed frame.

9. The battery device according to claim 6, characterized in that, It also includes a pressure plate, and the battery device includes multiple battery modules, with the pressure plate fixedly connected to at least two of the battery modules.

10. The battery device according to claim 9, characterized in that, At least a portion of the heat exchange components are disposed between the pressure plate and the fixed frame.

11. The battery device according to claim 10, characterized in that, The pressure plate is attached to the fixed frame via a first adhesive layer, the first adhesive layer having a clearance space, and at least a portion of the heat exchange components are disposed within the clearance space.

12. The battery device according to claim 1, characterized in that, The size of the battery pack in the second direction is smaller than the size of the battery pack in the first direction, and the size of the battery pack in the first direction is smaller than the size of the battery pack in the third direction. The first direction, the second direction, and the third direction are arranged to intersect each other.

13. The battery device according to any one of claims 1-12, characterized in that, The battery module further includes a fixing frame, within which multiple battery packs are housed. The fixing frame includes: End plates are provided on each side of the plurality of battery packs in the first direction; In the second direction, at least one side of the plurality of battery packs is provided with a side plate, the side plate is fixedly connected to the end plate at both ends in the first direction, the first direction and the second direction intersect, and the heat exchange assembly is provided on the side plate.

14. The battery device according to any one of claims 1-13, characterized in that, The plurality of electrode assemblies within each of the battery packs are stacked in a first direction, and each of the electrode assemblies is a solid-state electrode assembly.

15. The battery device according to claim 14, characterized in that, Each of the electrode assemblies includes two first sidewalls disposed opposite each other in the first direction, two second sidewalls disposed opposite each other in the second direction, and two third sidewalls disposed opposite each other in the third direction. At least two of the first sidewalls, second sidewalls, and third sidewalls of each electrode assembly are glued to the housing. The first direction, the second direction, and the third direction intersect each other in pairs.

16. The battery device according to any one of claims 1-13, characterized in that, Each of the electrode assemblies is disposed within a packaging bag; or Each of the electrode assemblies is unencapsulated and is directly housed within the housing.

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

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