Battery unit, battery device and electric device

Abstract

A battery unit, a battery device and an electric device. The battery unit comprises: a housing defining an accommodating cavity, and a plurality of electrode assemblies, wherein the plurality of electrode assemblies are arranged in the accommodating cavity, and the plurality of electrode assemblies are stacked in a first direction; and each electrode assembly comprises two first side walls arranged opposite to each other in the first direction, two second side walls arranged opposite to each other in a second direction, and two third side walls arranged opposite to each other in a third direction, at least two intersecting side walls among the first side walls, the second side walls and the third side walls of each electrode assembly being adhered to the housing, and the first direction, the second direction, and the third direction intersecting in pairs.

Description

Battery packs, 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 pack, battery device, and power supply device. Background Technology

[0004] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, batteries, as the power source, play an irreplaceable and crucial role. Among these, batteries, as a core component of new energy vehicles, have high requirements in terms of both reliability and safety.

[0005] In related technologies, the low connection strength of the electrode components in the battery pack makes the electrode components prone to shaking, which not only affects the rigidity of the battery pack, but also reduces the reliability and safety of the battery pack.

[0006] Application content

[0007] This application aims to at least partially address one of the technical problems in the related art.

[0008] Therefore, this application proposes a battery pack that effectively reduces the risk of electrode assembly shaking and improves the reliability and safety of the battery pack.

[0009] This application further proposes a battery device.

[0010] This application further proposes an electrical device.

[0011] The battery pack according to this application includes: a housing defining a receiving cavity; a plurality of electrode assemblies disposed within the receiving cavity, the plurality of electrode assemblies being stacked in a first direction, each electrode assembly including two first sidewalls disposed opposite each other in the 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 intersecting sidewalls of the first sidewalls, second sidewalls, and third sidewalls of each electrode assembly being glued to the housing, the first direction, the second direction, and the third direction intersecting each other in pairs.

[0012] 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.

[0013] 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

[0014] Figure 1 is a schematic diagram of the structure of an electrical device provided in some embodiments of this application as a vehicle;

[0015] Figure 2 is an exploded view of a battery device provided in some embodiments of this application;

[0016] Figure 3 is a schematic diagram of the structure of a battery pack provided in some embodiments of this application;

[0017] Figure 4 is a cross-sectional view of Figure 3 at point AA;

[0018] Figure 5 is an exploded view of a battery pack provided in some embodiments of this application;

[0019] Figure 6 is a schematic diagram of the battery pack provided in some other embodiments of this application;

[0020] Figure 7 is a cross-sectional view of Figure 6 at point BB;

[0021] Figure 8 is a cross-sectional view of Figure 6 at point CC;

[0022] Figure 9 is an exploded view of a battery pack provided in some other embodiments of this application. Detailed Implementation

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] In this application, "multiple" means two or more (including two).

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.).

[0034] 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 0.3O2 (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.

[0035] 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.

[0036] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0037] 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.

[0038] 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.

[0039] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0040] 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.

[0041] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0042] 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.

[0043] 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.

[0044] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0045] In some implementations, the electrode assembly is a stacked structure.

[0046] As an example, multiple positive and negative electrode plates can be set, and multiple positive and multiple negative electrode plates can be stacked alternately.

[0047] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] In some embodiments, the battery device may be a battery pack, which may include a housing and multiple battery packs housed within the housing.

[0052] As an example, the battery pack can be housed in a casing in a way that is fixed within the casing.

[0053] 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 closing, which can be either sealed or unsealed. The first part may be a top cover or a bottom plate.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, batteries, as the power source, play an irreplaceable and crucial role. Among these, batteries, as a core component of new energy vehicles, have high requirements in terms of both reliability and safety.

[0058] In related technologies, the low connection strength of the electrode components in the battery pack makes the electrode components prone to shaking, which not only affects the rigidity of the battery pack, but also reduces the reliability and safety of the battery pack.

[0059] Based on the above considerations, in order to reduce the risk of electrode assembly shaking, a battery pack is proposed. The battery pack includes: a housing and a plurality of electrode assemblies. The housing defines a receiving cavity, and the plurality of electrode assemblies are disposed in the receiving cavity. The plurality of electrode assemblies are stacked in a first direction. Each electrode assembly includes two first sidewalls arranged opposite each other in the first direction, two second sidewalls arranged opposite each other in a second direction, and two third sidewalls arranged 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. The first direction, the second direction, and the third direction intersect each other in pairs.

[0060] 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 enhances the assembly reliability of the electrode assembly, reduces the risk of wobbling, and consequently improves the rigidity, reliability, and safety of the battery pack.

[0061] This application provides a battery device using the battery pack disclosed herein. The battery device may be a battery module or a battery pack, etc.

[0062] This application provides an electrical device that uses the battery device or battery pack 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, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc. 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, etc.

[0063] For ease of explanation, the following embodiments use a vehicle as an example to describe the structure of the electrical device 1000, battery device 200, and battery pack 100 of this application.

[0064] Please refer to Figure 1, which is a schematic diagram of the structure of an electrical device 1000 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 200, which can be located at the bottom, front, or rear of the vehicle. The battery device 200 can be used to supply power to the vehicle; for example, the battery device 200 can serve as the vehicle's operating power source. The vehicle may also include a controller 300 and a motor 400. The controller 300 is used to control the battery device 200 to supply power to the motor 400, for example, to meet the power needs of the vehicle during starting, navigation, and driving. In some embodiments of this application, the battery device 200 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.

[0065] Please refer to Figure 2, which is an exploded view of a battery device 200 provided in some embodiments of this application. In some embodiments of this application, the battery device 200 includes a housing 210 and a plurality of battery packs 100 disposed within the housing 210.

[0066] The housing 210 has an enclosed space inside for accommodating the battery pack 100. The housing 210 can have various structures. In some embodiments, the housing 210 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. The open side of the second part interlocks with the open side of the first part to form a housing 210 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. The second part interlocks with the open side of the first part to form a housing 210 with an accommodating space.

[0067] In the battery device 200, there are multiple battery packs 100. These battery packs 100 can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that the multiple battery packs 100 are connected in both series and parallel. All the battery packs 100 are directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of all the battery packs 100 is housed in the housing 210.

[0068] In some embodiments, the battery device 200 may further include a busbar assembly, through which multiple battery packs 100 can be electrically connected to each other, enabling series, parallel, or mixed connection of the multiple battery packs 100. The busbar assembly may be a metallic conductor, such as copper, iron, aluminum, stainless steel, or aluminum alloy.

[0069] Please refer to Figures 3 to 5, where Figure 3 is a structural schematic diagram of the battery pack 100 provided in some embodiments of this application; Figure 4 is a cross-sectional view of Figure 3 at point AA; and Figure 5 is an exploded view of the battery pack 100 provided in some embodiments of this application. In some embodiments of this application, the battery pack 100 includes: a housing 110 and a plurality of electrode assemblies 120. The housing 110 defines a receiving cavity 111, and the plurality of electrode assemblies 120 are disposed within the receiving cavity 111. The plurality of electrode assemblies 120 are stacked in a first direction P. Each electrode assembly 120 includes two first sidewalls 121 disposed opposite to each other in the first direction P, two second sidewalls 122 disposed opposite to each other in the second direction Q, and two third sidewalls 123 disposed opposite to each other in the third direction R. At least two intersecting sidewalls of the first sidewall 121, second sidewall 122, and third sidewall 123 of each electrode assembly 120 are glued to the housing 110. The first direction P, the second direction Q, and the third direction R intersect each other in pairs.

[0070] "First direction P" can be understood as the width direction or left-right direction of battery pack 100, "second direction Q" can be understood as the height direction or up-down direction of battery pack 100, and "third direction R" can be understood as the length direction or front-back direction of battery pack 100. For specific direction illustrations, please refer to Figures 4 and 5.

[0071] In the above technical solution, by adhesively bonding at least two intersecting sidewalls of the first sidewall 121, the second sidewall 122, and the third sidewall 123 of each electrode assembly 120 to the outer casing 110, the connection strength between the electrode assembly 120 and the outer casing 110 is improved. This is beneficial to improving the assembly reliability of the electrode assembly 120, reducing the risk of the electrode assembly 120 shaking, thereby improving the rigidity of the battery pack 100, and also improving the reliability and safety of the battery pack 100.

[0072] The outer casing 110 can be made of a material with a certain degree of hardness and strength (such as metal) to reduce the risk of deformation after being squeezed or impacted, thereby allowing the battery pack 100 to have higher structural strength and improved reliability. The material of the outer casing 110 can include, but is not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, or plastic.

[0073] The battery pack 100 includes multiple electrode assemblies 120. For example, there may be several or dozens of electrode assemblies 120. Of course, the battery pack 100 may also include more electrode assemblies 120. Multiple electrode assemblies 120 are stacked along the first direction P and can be electrically connected. It is understood that the specific number of electrode assemblies 120 can be determined according to actual production requirements, and no specific limit is made here.

[0074] At least two intersecting sidewalls of the first sidewall 121, second sidewall 122, and third sidewall 123 of each electrode assembly 120 are glued to the housing 110. For example, one first sidewall 121 and one second sidewall 122 of each electrode assembly 120 can be glued to a portion of the housing 110 opposite to it, or one second sidewall 122 and one third sidewall 123 of each electrode assembly 120 can be glued to a portion of the housing 110 opposite to it, or one first sidewall 121 and one third sidewall 123 of each electrode assembly 120 can be glued to a portion of the housing 110 opposite to it; thus, by making the first sidewall 121, second sidewall 122, and third sidewall 123 of each electrode assembly 120... At least two intersecting sidewalls of wall 122 and the third sidewall are glued to the housing. Since each electrode assembly 120 can be fixed on at least one side in different directions, the electrode assembly 120 can be constrained in multiple directions. This increases the connection area between each electrode assembly 120 and the housing 110, thereby improving the connection strength between each electrode assembly 120 and the housing 110. This enhances the assembly reliability of each electrode assembly 120 and reduces the risk of the electrode assembly 120 shaking within the housing cavity 111. This improves the reliability and safety of the battery pack 100. Furthermore, the glued fixing method also provides sealing and moisture protection, reducing the risk of harmful gas leakage or short circuit of the battery pack 100.

[0075] It is understood that the specific sidewalls of each electrode assembly 120 that are glued to the housing 110 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 120 that are glued to the housing 110 and the specific number of corresponding sidewalls can be determined according to actual production requirements and are not specifically limited here.

[0076] In some embodiments of this application, at least one second sidewall 122 and at least one third sidewall 123 of each electrode assembly 120 are glued to the housing 110.

[0077] In the above technical solution, by adhesively bonding at least one second sidewall 122 and at least one third sidewall 123 of each electrode assembly 120 to the housing 110, it is beneficial to constrain each electrode assembly 120 in the second direction Q and the third direction R respectively, while also improving the connection strength between each electrode assembly 120 and the housing 110, thereby improving the stability of each electrode assembly 120 and reducing the risk of the electrode assembly 120 shaking.

[0078] A second sidewall 122 and a third sidewall 123 of each electrode assembly 120 can be glued to the housing 110 respectively, or the two second sidewalls 122 and the third sidewall 123 of each electrode assembly 120 can be glued to the housing 110 respectively, or the two third sidewalls 123 and the second sidewall 122 of each electrode assembly 120 can be glued to the housing 110 respectively.

[0079] Since multiple electrode assemblies 120 are stacked in the first direction P, the opposing first sidewalls 121 of adjacent electrode assemblies 120 cannot be glued to the housing 110. Therefore, by gluing at least one second sidewall 122 and at least one third sidewall 123 of each electrode assembly 120 to the housing 110, even if both first sidewalls 121 of the electrode assembly 120 cannot be glued to the housing 110 (for example, if the number of electrode assemblies 120 is greater than or equal to three, then the first sidewall 121 of the middle electrode assembly 120 in the first direction P cannot be glued to the housing 110), the intersecting sidewalls of the electrode assemblies 120 can still be glued to the housing 110. This not only constrains each electrode assembly 120 but also helps to improve the connection strength between each electrode assembly 120 and the housing 110, thereby improving the stability of each electrode assembly 120 and reducing the risk of the electrode assembly 120 shaking.

[0080] In some embodiments of this application, the electrode assembly 120 is provided with a positive electrode tab and a negative electrode tab, which are led out from the same third sidewall 123 of two third sidewalls 123.

[0081] In the above technical solution, by having the positive and negative tabs lead out from the same third sidewall 123, it is beneficial to simplify the structure of the battery pack 100, improve the convenience of production and assembly of the battery pack 100, and reduce the production cost of the battery pack 100.

[0082] When the positive and negative tabs are led out from the same third sidewall 123, 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 120. This simplifies the structure of the battery pack 100, improves the production convenience of the battery pack 100, and helps reduce the production cost of the battery pack 100.

[0083] Referring to Figure 5, in some embodiments of this application, the first sidewall 121 of the outermost electrode assembly 120 in the first direction P is glued to the housing 110.

[0084] In the above technical solution, by adhesively bonding the first sidewall 121 of the outermost electrode assembly 120 in the first direction P to the housing 110, it is beneficial to improve the connection reliability and connection strength between the multiple electrode assemblies 120 and the housing 110, thereby further reducing the risk of the electrode assembly 120 shaking inside the housing 110, improving the reliability and safety of the battery pack 100, and also improving the rigidity of the battery pack 100.

[0085] Multiple electrode assemblies 120 are stacked in a first direction P, and the first sidewall 121 of the outermost electrode assembly 120 in the first direction P is glued to the outer casing 110. In other words, the first sidewall 121 of the electrode assembly 120 that is closest to the outer casing 110 in the first direction P is glued to the outer casing 110. This allows the entire assembly formed by the multiple electrode assemblies 120 to be glued and fixed to the outer casing 110 in the first direction P, which helps to improve the reliability and strength of the connection between the multiple electrode assemblies 120 and the outer casing 110. This further reduces the risk of the electrode assembly 120 shaking inside the outer casing 110, improves the reliability and safety of the battery pack 100, and also helps to improve the rigidity of the battery pack 100.

[0086] In some embodiments of this application, in the second direction Q, both second sidewalls 122 of each electrode assembly 120 are glued to the housing 110.

[0087] In the above technical solution, by adhesively bonding both second sidewalls 122 of each electrode assembly 120 to the housing 110, it is beneficial to further improve the connection strength between each electrode assembly 120 and the housing 110 in the second direction Q, thereby further improving the assembly reliability of the electrode assembly 120, reducing the risk of the electrode assembly 120 shaking, and thus further improving the reliability and safety of the battery pack 100.

[0088] Both second sidewalls 122 of each electrode assembly 120 can be coated with adhesive so that both second sidewalls 122 of each electrode assembly 120 are glued to the housing 110. Alternatively, the portion of the housing 110 opposite to the second sidewalls 122 of the electrode assembly 120 in the second direction Q can be coated with adhesive so that both second sidewalls 122 of each electrode assembly 120 are glued to the housing 110.

[0089] Referring to Figures 4 and 5, in some embodiments of this application, the first sidewall 121 is the sidewall with the largest area of ​​the electrode assembly 120.

[0090] In the above technical solution, since the first sidewall 121 is the sidewall with the largest area of ​​the electrode assembly 120, and the first sidewall 121 of the outermost electrode assembly 120 in the first direction P is glued to the outer shell 110, the connection area between the electrode assembly 120 and the outer shell 110 is increased, which helps to improve the connection strength between the electrode assembly 120 and the outer shell 110, and further helps to reduce the risk of the electrode assembly 120 shaking, so as to further improve the safety and reliability of the battery pack 100.

[0091] The electrode assembly 120 can be formed into a cuboid structure. Each electrode assembly 120 can be vertically arranged in the receiving cavity 111, and the first sidewall 121 of each electrode assembly 120 is arranged opposite to each other along the first direction P. The first sidewall 121 of the outermost electrode assembly 120 in the first direction P is arranged opposite to the portion of the outer shell 110 in the first direction P and is glued to the outer shell 110. The first sidewall 121 is the sidewall with the largest area of ​​the electrode assembly 120. By gluing the first sidewall 121 to the outer shell 110, it is beneficial to increase the area where glue can be applied between the electrode assembly 120 and the outer shell 110, thereby increasing the area of ​​glue fixation between the electrode assembly 120 and the outer shell 110, that is, increasing the connection area between the electrode assembly 120 and the outer shell 110, thereby improving the connection strength between the electrode assembly 120 and the outer shell 110, and thus improving the stability of the electrode assembly 120.

[0092] Furthermore, since multiple electrode components 120 are stacked along the first direction P, compared to multiple electrode components 120 being stacked along the second direction Q, the space occupied by multiple electrode components 120 in the second direction Q can be effectively reduced, which is beneficial to reducing the size of the battery pack 100 in the second direction Q, and thus beneficial to increasing the arrangement space required by the battery pack 100 in the second direction Q, thereby improving the arrangement convenience of the battery pack 100.

[0093] Referring to Figures 6 to 9, where Figure 6 is a structural schematic diagram of the battery pack 100 provided in some embodiments of this application; Figure 7 is a cross-sectional view of Figure 6 at point BB; Figure 8 is a cross-sectional view of Figure 6 at point CC; and Figure 9 is an exploded view of the battery pack 100 provided in some embodiments of this application. In some embodiments of this application, an insulating component is provided between the housing 110 and the plurality of electrode assemblies 120.

[0094] In the above technical solution, by providing an insulating component between the outer casing 110 and the multiple electrode components 120, the risk of short circuits or leakage problems caused by the outer casing 110 contacting the electrode components 120 or other metal parts during operation of the battery pack 100 is reduced, which is beneficial to improving the safety of the battery pack 100.

[0095] In some examples, insulating components can be installed between the housing 110 and the multiple electrode assemblies 120 by means of powder spraying, electrophoresis, film application, etc. The insulating components can block unintended conductive paths, thereby reducing the risk of short circuits or leakage during operation of the battery pack 100 due to contact between the housing 110 and the electrode assemblies 120 or other metal parts, and improving the safety of the battery pack 100.

[0096] The specific process for processing the insulating components can be determined based on the operating environment, temperature range, and electrical performance requirements of the battery pack 100. For example, when the battery pack 100 is used in a high humidity or high corrosive environment, electrophoresis or film coating processes can be used to process the insulating components to improve their moisture-proof and corrosion-proof performance. When the battery pack 100 is used in a high temperature environment, powder coating processes can be used to process the insulating components, which helps to improve the heat resistance and insulation of the insulating components.

[0097] The materials used for the insulation components can be polymers, ceramics, or composite materials, and the specific materials chosen can be determined based on actual production requirements. No specific restrictions are imposed here.

[0098] Referring to Figures 7 to 9, in some embodiments of this application, the insulating component includes an insulating coating 131 sprayed on the inner wall of the housing 110; and / or the insulating component includes an insulating sheet 132 fixed between the electrode assembly 120 and the housing 110.

[0099] In the above technical solution, by including an insulating coating 131 sprayed on the inner wall of the housing 110, the insulating coating 131 can completely cover the inner wall of the housing 110, which is beneficial to improving the insulation reliability of the insulating component and reducing the risk of displacement or detachment of the insulating component, thus improving the long-term reliability of the insulating component. By including an insulating sheet 132 fixed between the electrode assembly 120 and the housing 110, the insulating sheet 132 is easy to assemble, which can effectively improve the production and assembly efficiency of the battery pack 100. Furthermore, the insulating sheet 132 can play a role in buffering and reducing wear, which is beneficial to improving the service life and safety of the battery pack 100.

[0100] In some examples, the insulating component includes an insulating coating 131 sprayed onto the inner wall of the housing 110. Since the insulating coating 131 is thin, it can effectively reduce the space occupied by the insulating component within the housing 110, thus saving more installation space for the electrode assembly 120. At the same time, since the insulating coating 131 can form a continuous and complete insulating film on the inner wall of the housing 110, it can effectively reduce the risk of leakage protection, improve the insulation reliability of the insulating component, and the risk of the insulating coating 131 falling off the housing 110 is low, which is beneficial to improving the long-term insulation stability of the insulating component.

[0101] In other examples, the insulating component includes an insulating sheet 132 fixed between the electrode assembly 120 and the housing 110. The insulating sheet 132 can be clamped and fixed between the electrode assembly 120 and the housing 110, or the insulating sheet 132 can be fixed between the electrode assembly 120 and the housing 110 by adhesive or fixed mounting structure. The insulating sheet 132 is easy to install and remove, which helps to improve the assembly and maintenance convenience of the battery pack 100. At the same time, the insulating sheet 132 can act as a buffer between the electrode assembly 120 and the housing, reducing the damage to the electrode assembly 120 caused by mechanical collision. Meanwhile, the insulating sheet 132 can reduce the wear between the electrode assembly 120 and the housing, which helps to improve the service life of the battery pack 100.

[0102] In some other examples, the insulating component includes an insulating coating 131 sprayed onto the inner wall of the housing 110, and an insulating sheet 132 fixed between the electrode assembly 120 and the housing 110, to improve the insulation effect of the insulating component, further improve the safety of the battery pack 100, and at the same time enable the insulating component to have a buffering function, thereby improving the functionality of the insulating component.

[0103] As shown in FIG9, in some embodiments of this application, an insulating sheet 132 is provided between the first sidewall 121 and the outer shell 110.

[0104] In the above technical solution, by providing an insulating sheet 132 between the first sidewall 121 and the outer casing 110, the risk of electrical short circuit or leakage caused by contact between the electrode assembly 120 and the outer casing 110 is reduced. At the same time, the space occupied by the insulating assembly in the second direction Q can be reduced, which is conducive to reducing the size of the battery pack 100 in the second direction Q, and further conducive to reducing the arrangement space required for the battery pack 100 in the second direction Q.

[0105] An insulating sheet 132 is provided between the first sidewall 121 of the outermost electrode assembly 120 and the outer casing 110. On one hand, the insulating sheet 132 can isolate the electrode assembly 120 from the outer casing 110 at the end of the assembly formed by the multiple electrode assemblies 120, reducing the risk of leakage or short circuits in the battery pack 100 due to contact between the electrode assembly 120 and the outer casing 110, thus improving the safety of the battery pack 100. On the other hand, considering the limited space in the battery pack 100 in the second direction Q, if an insulating sheet 132 is provided between the second sidewall 122 and the outer casing 110... This would cause the insulating sheet 132 to encroach on the space in the housing 110 used for arranging the electrode assembly 120, thereby affecting the performance of the battery pack 100. Therefore, by providing the insulating sheet 132 between the first sidewall 121 and the housing 110, not only can the insulation effect between the electrode assembly 120 and the housing 110 be guaranteed, but the encroachment of the insulating sheet 132 on the space in the housing 110 used for arranging the electrode assembly 120 can also be reduced, which is beneficial to improving the performance of the battery pack 100. At the same time, the size of the battery pack 100 in the second direction Q can be reduced, thereby reducing the arrangement space required for the battery pack 100 in the second direction Q.

[0106] In some examples, the insulating sheet 132 can be made of a high-strength, high-insulation material, such as polyester film or polyimide film, to improve the temperature resistance and compressive strength of the insulating sheet 132, so that the insulating sheet 132 can meet the operating requirements of the battery pack 100 under different operating conditions.

[0107] As shown in FIG9, in some embodiments of this application, a flexible first buffer 140 is provided between the first sidewall 121 and the outer shell 110.

[0108] In the above technical solution, a flexible first buffer 140 is provided between the first sidewall 121 and the outer shell 110 to alleviate the impact force on the electrode assembly 120 during installation into the outer shell 110, thereby reducing the risk of deformation or damage to the electrode assembly 120 due to external impact or uneven force.

[0109] Considering that the electrode assembly 120 may collide with the housing 110 when it is installed in the housing 110, a first buffer 140 can be provided between the first sidewall 121 of the outermost electrode assembly 120 and the housing 110. The first buffer 140 can absorb the impact force, thereby effectively reducing the risk of damage to the electrode assembly 120.

[0110] The first buffer 140 is first positioned inside the outer shell 110. After the electrode assembly 120 is installed inside the outer shell 110, the first buffer 140 is clamped and fixed by the electrode assembly 120 and the outer shell 110. Alternatively, the first buffer 140 can be fixed to the first side wall 121 and the outer shell 110 by adhesive. For example, adhesive can be applied to the outer wall of the first buffer 140, and the first buffer 140 can be first bonded to the first side wall 121 of the outermost electrode assembly 120 among the multiple electrode assemblies 120. After the electrode assembly 120 is installed inside the outer shell 110, the first buffer 140 is bonded and fixed to the outer shell 110.

[0111] In some embodiments of this application, the first buffer 140 is an insulating material component.

[0112] In the above technical solution, by making the first buffer 140 an insulating material, the insulation effect between the electrode assembly 120 and the outer casing 110 is further improved, thereby helping to further reduce the risk of electrical short circuits or leakage caused by contact between the electrode assembly 120 and the outer casing 110, and improving the safety of the battery pack 100.

[0113] In some examples, the first buffer 140 can be formed as a silicone material, an EVA (ethylene-vinyl acetate copolymer) material, or an EPDM (ethylene propylene diene monomer) material, so that the first buffer 140 can not only have insulation, but also high elasticity and high temperature resistance, thereby improving the buffering effect of the first buffer 140 on impact force, and at the same time making the first buffer 140 suitable for the high temperature conditions of the battery pack 100.

[0114] It is understood that the material of the first buffer 140 mentioned above is only an example for ease of understanding and should not be construed as a limitation of this application. The first buffer 140 can also be configured with other materials, and its specific material settings can be determined according to actual production requirements, without specific limitations here.

[0115] Referring to FIG8, in some embodiments of this application, a second buffer 150 is provided between adjacent electrode assemblies 120.

[0116] In the above technical solution, by providing a second buffer 150 between adjacent electrode assemblies 120, the risk of adjacent electrode assemblies 120 coming into contact with each other is reduced. At the same time, the second buffer 150 can buffer and dampen the adjacent electrode assemblies 120, reducing the risk of the electrode assemblies 120 shaking or being damaged. In addition, the second buffer 150 can also improve the heat conduction efficiency between adjacent electrode assemblies 120, thereby improving the thermal management performance of the battery pack 100.

[0117] Multiple electrode assemblies 120 are stacked along a first direction P. A second buffer 150 is provided between every two adjacent electrode assemblies 120. The second buffer 150 can clamp and fix the two adjacent electrode assemblies 120 to prevent the adjacent electrode assemblies 120 from contacting each other, thereby reducing the risk of short circuit in the battery pack 100. At the same time, the second buffer 150 can also serve as heat insulation to reduce heat transfer between adjacent electrode assemblies 120, thereby reducing the risk of thermal runaway of the battery pack 100 caused by overheating in a single area. In addition, the second buffer 150 can buffer and dampen vibration between two adjacent electrode assemblies 120 to reduce the risk of displacement of the electrode assemblies 120 due to vibration, compression or thermal expansion and contraction, thereby improving the stability of the electrode assemblies 120 and thus improving the stability and safety of the battery pack 100.

[0118] In some embodiments of this application, the second buffer 150 is glued to the adjacent electrode assembly 120.

[0119] In the above technical solution, by adhesively fixing the second buffer 150 to the adjacent electrode assembly 120, the assembly reliability between the second buffer 150 and the electrode assembly 120 is improved, and the risk of failure of the second buffer 150 due to detachment is reduced.

[0120] In the first direction P, the two sides of the second buffer 150 opposite to the electrode assembly 120 can be coated with adhesive to allow the second buffer 150 to be glued and fixed to the adjacent electrode assembly 120, thereby improving the assembly reliability between the second buffer 150 and the electrode assembly 120 and reducing the risk of the second buffer 150 falling off. This ensures the reliability of the second buffer 150 in separating the two adjacent electrode assemblies 120, the heat insulation effect of the second buffer 150, and the effect of the second buffer 150 in preventing the electrode assembly 120 from shifting. This is beneficial to improving the safety and reliability of the battery pack 100.

[0121] In some embodiments of this application, each electrode assembly 120 is a solid electrode assembly, and each of the electrode assemblies 120 is disposed in a packaging bag; or each of the electrode assemblies 120 is not packaged and is directly housed in the housing 110.

[0122] In the above technical solution, by placing each electrode assembly 120 inside a packaging bag, the packaging bag can serve as an insulating barrier, reducing the risk of short circuits caused by contact between the electrode assembly 120 and the outer casing 110. On the other hand, harmful gases generated by the electrode assembly 120 can be sealed inside the packaging bag, further reducing the risk of harmful gas leakage, thereby further reducing the risk of harmful gases posing a threat to human health and improving the reliability of the battery pack 100. Alternatively, by making each electrode assembly 120 unpackaged and directly housed inside the outer casing 110, the space within the outer casing 110 that can be used to arrange the electrode assembly 120 is increased, allowing the battery pack 100 to have higher energy density while reducing the production cost of the battery pack 100.

[0123] Electrode assembly 120 is a component in battery pack 100 where electrochemical reactions occur. Multiple electrode assemblies 120 are housed within a receiving cavity 111 defined by housing 110. Each electrode assembly 120 is a solid-state electrode assembly, which generates harmful gases during use.

[0124] Each electrode assembly 120 is disposed within a packaging bag to form a battery cell, which is housed within a housing 110; wherein, the packaging bag can be a flexible housing 110, such as aluminum-plastic film, heat-shrink film, etc.

[0125] After the electrode assembly 120 is encapsulated in packaging bags, multiple packaging bags are then housed within the outer casing 110. On one hand, the packaging bags serve as insulation, further reducing the risk of short circuits caused by contact between the electrode assembly 120 and the outer casing 110, thus improving the safety of the battery pack 100. On the other hand, harmful gases generated by the electrode assembly 120 can be sealed within the packaging bags. Even if harmful gases leak from the packaging bags, the outer casing 110 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 100.

[0126] After the electrode assembly 120 is encapsulated in a packaging bag, the packaging bag can be glued to the outer shell 110 to improve the connection strength between the electrode assembly 120 and the outer shell 110.

[0127] Each electrode assembly 120 is unencapsulated and directly housed within the housing 110. In other words, the battery pack 100 can omit the encapsulation bag for the electrode assembly 120 to reduce the occupancy of the housing cavity 111, thereby increasing the space available for arranging the electrode assembly 120 within the housing cavity 111, allowing the battery pack 100 to have a higher energy density.

[0128] As shown in Figure 2, in some embodiments of this application, the size of the battery pack 100 in the second direction Q is smaller than the size of the battery pack 100 in the first direction P, and the size of the battery pack 100 in the first direction P is smaller than the size of the battery pack 100 in the third direction R, so that the size of the battery pack 100 in each direction is more reasonable.

[0129] In some technologies, the battery pack is large in size in all directions, which leads to poor structural strength; in other technologies, the battery pack is small in size in all directions, which leads to low energy density of the battery device. However, the battery pack 100 of this application 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 200.

[0130] In some examples, the first direction P is the thickness direction of the electrode assembly 120, and the first direction P is also the length direction of the housing 210. The thickness direction of the electrode assembly 120 is the direction of the minimum size of the electrode assembly 120, and the length direction of the housing 210 is the direction of the maximum size of the housing 210. By stacking multiple electrode assemblies 120 in the first direction P in each battery pack 100, more electrode assemblies 120 can be arranged in the housing 210, which is beneficial to improving the energy density of the battery device 200.

[0131] In some examples, the wall surface with the largest area of ​​the electrode assembly 120 (i.e., the first sidewall 121) is perpendicular to the first direction P. Combined with the multiple electrode assemblies 120 in each battery pack 100 being stacked in the first direction P, when the electrode assembly 120 expands during charging and discharging, the expansion stress is evenly distributed to the adjacent electrode assemblies 120 in the first direction P, which can better resist the expansion of the electrode assembly 120, so as to improve the reliability of the battery device 200.

[0132] Referring to Figure 5 or Figure 9, in some embodiments of this application, the housing 110 includes: a first wall portion 112 and a second wall portion 113, the first wall portion 112 and the second wall portion 113 being disposed opposite to each other in a first direction P; a third wall portion 114 and a fourth wall portion 115, the third wall portion 114 and the fourth wall portion 115 being disposed opposite to each other in a second direction Q; the first wall portion 112, the third wall portion 114 and the fourth wall portion 115 are integral parts, the second wall portion 113 is fixed to the third wall portion 114 and the fourth wall portion 115 respectively, the first wall portion 112 and the second wall portion 113 are respectively glued to the corresponding first sidewall 121, and at least one of the third wall portion 114 and the fourth wall portion 115 is glued to a plurality of electrode assemblies 120.

[0133] In the above technical solution, by forming the first wall portion 112, the third wall portion 114, and the fourth wall portion 115 into a single piece, it is beneficial to simplify the assembly process of the battery pack 100 and improve the production and assembly efficiency of the battery pack 100. By bonding the first wall portion 112 and the second wall portion 113 to the corresponding first side wall 121 respectively, and bonding at least one of the third wall portion 114 and the fourth wall portion 115 to the multiple electrode assemblies 120, it is beneficial to improve the connection strength between the outer casing 110 and the electrode assembly 120, reduce the risk of the electrode assembly 120 shaking, and improve the rigidity of the battery pack 100.

[0134] The first wall portion 112, the third wall portion 114, and the fourth wall portion 115 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 P after bending are defined as the third wall portion 114 and the fourth wall portion 115, respectively. The part connecting the third wall portion 114 and the fourth wall portion 115 in the second direction Q is defined as the first wall portion 112. Thus, by bending the plate to form the first wall portion 112, the second wall portion 113, and the fourth wall portion 115, the assembly process of the outer casing 110 can be effectively simplified, and the production and assembly efficiency of the battery pack 100 can be improved.

[0135] The second wall portion 113 is disposed opposite to the first wall portion 112 in the first direction P, and is fixed to the third wall portion 114 and the fourth wall portion 115 respectively in the second direction Q. The first wall portion 112 and the second wall portion 113 are respectively disposed opposite to the first side wall 121 of the outermost electrode assembly 120 in the first direction P and are glued and fixed, so that the housing 110 can limit the overall structure formed by the multiple electrode assemblies 120 in the first direction P, thereby reducing the risk of the electrode assembly 120 shaking or shifting in the first direction P, improving the stability of the electrode assembly 120, and thus improving the safety and reliability of the battery pack 100.

[0136] At least one of the third wall portion 114 and the fourth wall portion 115 is adhesively bonded to the plurality of electrode assemblies 120. For example, the third wall portion 114 may be adhesively fixed to the second side wall 122 of the plurality of electrode assemblies 120 that is disposed opposite to it, or the fourth wall portion 115 may be adhesively fixed to the second side wall 122 of the plurality of electrode assemblies 120 that is disposed opposite to it, or the third wall portion 114 and the fourth wall portion 115 may be adhesively fixed to the second side wall 122 of the plurality of electrode assemblies 120 that is disposed opposite to it, so that the housing 110 can further limit the electrode assembly 120, thereby further reducing the risk of the electrode assembly 120 shaking or shifting in the first direction P, further improving the stability of the electrode assembly 120, and thus helping to further improve the safety and reliability of the battery pack 100.

[0137] In some specific embodiments, the integral piece formed by the first wall portion 112, the third wall portion 114, and the fourth wall portion 115 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 110. This can improve the protective effect of the housing 110 on the electrode assembly 120 while improving the heat dissipation effect of the battery pack 100, thereby further improving the safety of the battery pack 100.

[0138] Referring to FIG9, in some embodiments of this application, the housing 110 further includes a fifth wall portion 116 and a sixth wall portion 117. The fifth wall portion 116 and the sixth wall portion 117 are disposed opposite to each other in a third direction R. The third direction R intersects with the first direction P and the second direction Q respectively. The fifth wall portion 116 is provided with a first lead-out portion and a second lead-out portion. The polarities of the first lead-out portion and the second lead-out portion are opposite. The first lead-out portion is electrically connected to a plurality of electrode assemblies 120, and the second lead-out portion is electrically connected to a plurality of electrode assemblies 120.

[0139] It should be noted that "third direction R" can be understood as the length direction of the battery pack 100 or the front-to-back direction. For a specific direction illustration, please refer to Figure 9.

[0140] In the above technical solution, by providing a first lead-out portion and a second lead-out portion on the fifth wall portion 116, the convergence of multiple electrode assemblies 120 can be realized.

[0141] The fifth wall portion 116 can be fixed to one side of the third wall portion 114 and the fourth wall portion 115 on the third direction R, and the sixth wall portion 117 can be fixed to the other side of the third wall portion 114 and the fourth wall portion 115 on the third direction R. Thus, the first wall portion 112, the second wall portion 113, the third wall portion 114, the fourth wall portion 115, the fifth wall portion 116 and the sixth wall portion 117 together enclose and form the outer shell 110, and form a closed receiving cavity 111 inside the outer shell 110, so as to improve the protective capability of the outer shell 110 against the electrode assembly 120 disposed therein, and help reduce the risk of harmful gases leaking from the outer shell 110.

[0142] The battery pack 100 may include an electrical output module. A portion of the electrical output module may be disposed between the fifth wall portion 116 and the electrode assembly 120. 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 116 and the electrode assembly 120. The busbar assembly is disposed on the insulating plate and electrically connected to multiple electrode assemblies 120 to achieve current convergence of the multiple electrode assemblies 120. The output electrode assembly includes a first lead and a second lead, which are disposed on the fifth wall portion 116. 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 100, and the other can serve as the negative output terminal of the battery pack 100. Both are electrically connected to external electrical connection components to achieve outputting electrical energy from the battery pack 100 or inputting electrical energy into the battery pack 100.

[0143] The assembly process of the battery pack 100 according to an embodiment of this application is briefly described below with reference to FIG5.

[0144] First, multiple electrode assemblies 120 are stacked in a first direction P at the front edge of the housing 110. The second sidewall 122 of each electrode assembly 120 and the first sidewall 121 of the outermost electrode assembly 120 in the first direction P are coated with adhesive. After the adhesive is applied, the entire assembly of multiple electrode assemblies 120 can be glued to the integral part formed by the first wall portion 112, the third wall portion 114 and the fourth wall portion 115. The second sidewall 122 is glued and fixed to the third wall portion 114 and the fourth wall portion 115 respectively, and the first sidewall 121 can be glued and fixed to the first wall portion 112.

[0145] The adhesive can be a special adhesive with good bonding performance, high temperature resistance, and corrosion resistance to improve the connection reliability between the electrode assembly 120 and the shell 110 and reduce the risk of loosening or falling off between the electrode assembly 120 and the shell 110 during long-term use of the battery pack 100. 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.

[0146] During the bonding process, the integral piece formed by the first wall portion 112, the third wall portion 114, and the fourth wall portion 115 contacts and fits against the electrode assembly 120 to improve the bonding effect and thermal conductivity. Furthermore, pressure is applied at the bonding location to enhance the adhesion between the electrode assembly 120 and the housing 110. After bonding, the bonding location is cured to allow the adhesive to fully cure, improving the stability and durability of the bond.

[0147] After bonding the electrode assembly 120 to the integrated component, the second wall portion 113 can be further welded or bonded to the integrated component. Then, the sixth wall portion 117 can be positioned and fixed to the integrated component. To improve the connection strength and sealing performance between the sixth wall portion 117 and the integrated component, adhesive can be applied again between them to enhance the connection strength. After bonding the sixth wall portion 117 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 117 can also be fixedly connected to the integrated component by welding to improve the connection strength and sealing performance.

[0148] After completing the connection between the electrode assembly 120, the integral part, and the sixth wall portion 117, the fifth wall portion 116 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 116 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.

[0149] After welding, the battery pack 100 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 the battery pack 100 will not leak or become waterlogged during use. The stability of the battery pack 100 can be evaluated through vibration testing, impact testing, and high / low temperature cycling testing to ensure it functions normally under various environmental conditions.

[0150] After all inspections and tests are completed, the battery pack 100 can proceed to the next process or undergo packaging. During the packaging process, the battery pack 100 can be encased in a shell 110, and heat dissipation design and electrical connection can be carried out according to the usage requirements of the battery pack 100, further improving the performance and safety of the battery pack 100.

[0151] In summary, by applying adhesive to the first sidewall 121 and the second sidewall 122 of the electrode assembly 120, the electrode assembly 120 is bonded to the outer casing 110. Then, the integral component is connected to the second wall portion 113, the fifth wall portion 116, and the sixth wall portion 117, respectively, ultimately forming a battery pack 100 with a stable structure, good sealing, and excellent conductivity. This not only improves the manufacturing efficiency of the battery pack 100 but also enhances its overall performance and reliability.

[0152] As shown in Figure 9, in some embodiments of this application, the fifth wall portion 116 is provided with two first through holes 1161 and a support portion 1162. The support portion 1162 is located outside the receiving cavity 111 and on one side of the first through holes 1161. The first lead-out portion and the second lead-out portion are respectively passed through the corresponding first through holes 1161 and supported and fixed by the support portion 1162.

[0153] In the above technical solution, by providing two first through holes 1161 on the fifth wall portion 116, the first lead-out portion and the second lead-out portion can extend out from the outer casing 110, 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 100 or the input of electrical energy to the battery pack 100; by providing a support portion 1162 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.

[0154] The fifth wall portion 116 may be provided with two first through holes 1161 that pass through it along a third direction R. The two first through holes 1161 may be arranged at intervals in the first direction P. The first lead-out portion may extend out of the housing 110 through one of the two first through holes 1161, and the second lead-out portion may extend out of the housing 110 through the other of the two first through holes 1161, thereby facilitating connection with external electrical connection components.

[0155] The fifth wall portion 116 is also provided with a support portion 1162. The support portion 1162 can be provided on the side of the fifth wall portion 116 facing away from the electrode assembly 120 in the third direction R. The support portion 1162 can be provided opposite to the first through hole 1161 in the second direction Q and located below the first through hole 1161. After the first lead-out portion and the second lead-out portion extend out of the housing 110, the support portion 1162 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.

[0156] Referring to FIG9, in some embodiments of this application, each support portion 1162 includes a sub-support body 11621 spaced apart in a first direction P, and each sub-support body 11621 includes a support arm a disposed opposite to the fifth wall portion 116 in a third direction R.

[0157] In the above technical solution, by designing the support part 1162, on the one hand, the material used in the support part 1162 can be reduced, thereby reducing the material cost of the battery pack 100; on the other hand, the support and fixing effect of the support part 1162 can be improved, thereby improving the stability of the electrical connection of the battery pack 100.

[0158] Each support portion 1162 includes two sub-support bodies 11621 arranged opposite to each other and spaced apart in the first direction P. Each sub-support body 11621 includes a portion extending in the third direction R and a portion extending in the first direction P (i.e., support arm a). One end of the portion of the sub-support body 11621 extending in the third direction R is connected to the fifth wall portion 116, and the other end is connected to the portion extending in the first direction P. In short, in the projection plane in the second direction Q, the projection plane of each sub-support body 11621 is L-shaped, and the L-shaped openings of the two sub-support bodies 11621 of each support portion 1162 open towards each other. Since the support portion 1162 is not formed as a solid boss structure, but is composed of two support arms a with L-shaped projection planes, the material used in the support portion 1162 can be effectively reduced, the material cost of the support portion 1162 can be reduced, and thus the production cost of the battery pack 100 can be reduced.

[0159] For ease of explanation, the first lead-out portion is described using the support portion 1162 as an example. When the first lead-out portion extends out of the housing 110 through the first through hole 1161, the fifth wall portion 116 can support one end of the first lead-out portion in the third direction R. Since each support portion 1162 includes two support arms a that are arranged opposite to the fifth wall portion 116 in the third direction R, and the two support arms a are arranged opposite to each other in the first direction P, the support arms a can support the other end of the first lead-out portion, thereby reducing the risk of the first lead-out portion falling off between the two sub-supports 11621 and improving the stability of the first lead-out portion.

[0160] As shown in FIG9, in some embodiments of this application, the sixth wall portion 117 is provided with an explosion-proof valve, which is configured to vent air outward under set conditions.

[0161] In the above technical solution, by setting an explosion-proof valve in the sixth wall 117, on the one hand, the space on the shell can be reasonably allocated, which is conducive to the miniaturization design of the battery pack 100. On the other hand, when the battery pack 100 experiences thermal runaway or short circuit, a large amount of gas generated inside the shell 110 can be discharged through the explosion-proof valve, thereby reducing the risk of shell 110 rupture or explosion and improving the safety of the battery pack 100.

[0162] The sixth wall portion 117 is provided with a valve body mounting hole 160 that extends through it in a third direction R. The explosion-proof valve can be installed on the sixth wall portion 117 through the valve body mounting hole 160 and communicate with the receiving cavity 111. When the battery pack 100 experiences thermal runaway or short circuit, a large amount of gas will be generated inside the casing 110. When a preset condition is reached, such as the gas pressure inside the casing 110 reaching a set value or the temperature inside the casing 110 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 gas continuously accumulating inside the casing 110, which may lead to the rupture of the casing 110 or even the explosion of the battery pack 100, thereby improving the safety of the battery pack 100.

[0163] Considering that the first wall portion 112 to the fourth wall portion 115 are all used for bonding and fixing with the electrode assembly 120, and the fifth wall portion 116 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 117. This way, it will not interfere with the bonding and fixing of the outer shell 110 and the electrode assembly 120, 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 110.

[0164] Please refer to Figure 2. According to an embodiment of this application, the battery device 200 includes a housing 210 and a plurality of battery packs 100. Each battery pack 100 is the aforementioned battery pack 100, and the plurality of battery packs 100 are disposed within the housing 210.

[0165] In the above technical solution, since the battery device 200 adopts the battery pack 100, by adhesively bonding at least one second sidewall 122 of each electrode assembly 120 to the housing 110, and by adhesively bonding the first sidewall 121 of the outermost electrode assembly 120 in the first direction P to the housing 110, the connection strength between the electrode assembly 120 and the housing 110 is improved. This is beneficial to improving the assembly reliability of the electrode assembly 120, reducing the risk of the electrode assembly 120 shaking, thereby improving the rigidity of the battery pack 100, and also improving the reliability and safety of the battery pack 100, thus improving the reliability and safety of the battery device 200.

[0166] Referring to Figures 2 and 9, in some embodiments of this application, the outer shell 110 is fixed to the housing 210 by a fixing connector 220.

[0167] In the above technical solution, by fixing the outer casing 110 to the housing 210 through the fixing connector 220, the assembly reliability of the battery pack 100 and the housing 210 is improved, the risk of the battery pack 100 shaking inside the housing 210 is reduced, thereby improving the stability and safety of the battery device 200.

[0168] A fixing connection portion 170 may be provided on the side of the outer casing 110 away from the receiving cavity 111. The fixing connection portion 170 is used to connect the outer casing 110 to the housing 210 so that the outer casing 110 is fixed to the housing 210. For example, the fixing connection portion 170 may be provided with a threaded hole, and the fixing connection member 220 may be formed as a threaded connection member (e.g., screw or bolt). The outer casing 110 can be threadedly connected to the housing 210 through the fixing connection member 220, and the threaded connection method can facilitate the disassembly and assembly of the battery pack 100 and the housing 210, thereby improving the convenience of maintenance and repair of the battery device 200.

[0169] Please refer to Figure 1. According to an embodiment of this application, the power supply device 1000 includes the battery device 200 described above; or includes the battery pack 100 described above, the battery pack 100 being used to provide electrical energy.

[0170] In the above technical solution, since the power device 1000 uses the battery pack 100, by adhesively bonding at least one second sidewall 122 of each electrode assembly 120 to the housing 110, and by adhesively bonding the first sidewall 121 of the outermost electrode assembly 120 in the first direction P to the housing 110, the connection strength between the electrode assembly 120 and the housing 110 is improved. This is beneficial to improving the assembly reliability of the electrode assembly 120, reducing the risk of the electrode assembly 120 shaking, thereby improving the rigidity of the battery pack 100, and improving the reliability and safety of the battery pack 100. This is beneficial to improving the reliability and safety of the battery device 200, and further beneficial to improving the reliability and safety of the power device 1000.

[0171] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0172] 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 pack, wherein, include: The outer casing defines a receiving cavity; Multiple electrode assemblies are disposed within the receiving cavity. The multiple electrode assemblies are stacked in a first direction. Each electrode assembly includes two first sidewalls arranged opposite each other in the first direction, two second sidewalls arranged opposite each other in a second direction, and two third sidewalls arranged opposite each other in a third direction. At least two of the first sidewalls, second sidewalls, and third sidewalls of each electrode assembly intersect each other in the outer shell. The first direction, the second direction, and the third direction intersect each other in pairs.

2. The battery pack according to claim 1, wherein, At least one second sidewall and at least one third sidewall of each of the electrode assemblies are glued to the housing.

3. The battery pack according to claim 1, wherein, The electrode assembly is provided with a positive electrode tab and a negative electrode tab, and the positive electrode tab and the negative electrode tab are led out from the same third sidewall of the two third sidewalls.

4. The battery pack according to claim 1, wherein, The first sidewall of the outermost electrode assembly in the first direction is glued to the housing.

5. The battery pack according to claim 1, wherein, In the second direction, both second sidewalls of each electrode assembly are glued to the housing.

6. The battery pack according to claim 1, wherein, The first sidewall is the sidewall with the largest area of ​​the electrode assembly.

7. The battery pack according to claim 1, wherein, An insulating component is provided between the housing and the plurality of electrode assemblies.

8. The battery pack according to claim 7, wherein, The insulating components include an insulating coating sprayed onto the inner wall of the housing; and / or The insulating component includes an insulating sheet fixed between the electrode assembly and the housing.

9. The battery pack according to claim 8, wherein, The insulating sheet is provided between the first sidewall and the outer casing.

10. The battery pack according to claim 1, wherein, A flexible first buffer is provided between the first sidewall and the outer shell.

11. The battery pack according to claim 10, wherein, The first buffer is made of insulating material.

12. The battery pack according to claim 1, wherein, A second buffer is provided between adjacent electrode assemblies.

13. The battery pack according to claim 12, wherein, The second buffer is glued and fixed to the adjacent electrode assembly.

14. The battery pack according to claim 1, wherein, Each of the electrode assemblies is a solid-state electrode assembly, and 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.

15. The battery pack 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.

16. The battery pack according to any one of claims 1-15, wherein, The outer casing includes: A first wall portion and a second wall portion are disposed opposite to each other in the first direction; The third wall portion and the fourth wall portion are disposed opposite to each other in the second direction; The first wall portion, the third wall portion, and the fourth wall portion are integral parts. The second wall portion is fixed to the third wall portion and the fourth wall portion respectively. The first wall portion and the second wall portion are respectively glued to the corresponding first side wall. At least one of the third wall portion and the fourth wall portion is glued to the plurality of electrode assemblies.

17. The battery pack according to claim 16, wherein, The housing further includes a fifth wall portion and a sixth wall portion, which are disposed opposite to each other in a third direction. The third direction intersects the first direction and the second direction respectively. The fifth wall portion is provided with a first lead-out portion and a second lead-out portion. The polarities of the first lead-out portion and the second lead-out portion are opposite. The first lead-out portion is electrically connected to a plurality of electrode assemblies, and the second lead-out portion is electrically connected to a plurality of electrode assemblies.

18. A battery device, wherein, include: Box; Multiple battery packs, each of which is a battery pack according to any one of claims 1-17, and the multiple battery packs are disposed in the housing.

19. The battery device according to claim 18, wherein, The outer shell is fixed to the box body by a fixing connector.

20. An electrical appliance, wherein, It includes the battery device according to claim 18 or 19; or it includes the battery pack according to any one of claims 1-17, the battery pack being used to provide electrical energy.

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