Battery and electrical device

Abstract

Disclosed in the present application are a battery and an electrical device. The battery comprises a battery cell group and a first box body. The first box body comprises a bottom wall and two first side walls oppositely arranged in a first direction, the battery cell group is located between the two first side walls, the bottom wall is used for bearing the battery cell group, and each first side wall and the bottom wall are connected by means of a first connection part. Each first side wall has a first side surface facing the battery cell group; in the first direction, the minimum distance between the first side surface and the battery cell group is L1, and the minimum distance between the first connection part and the battery cell groups is L2, L1≤L2, thus effectively improving the reliability of the battery.

Description

Batteries and electrical equipment CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to Chinese patent application No. 202420227124.2, filed on January 30, 2024, entitled “Batteries and Electrical Equipment,” the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a battery and an electrical device. Background Art

[0003] With the development of new energy technologies, batteries are being used more and more widely. Batteries have high energy density, high reliability, long service life, and are environmentally friendly to the social environment. They have been widely used in passenger cars, commercial vehicles, electric bicycles, heavy trucks, energy storage facilities, battery swap stations, engineering manufacturing, smart devices, etc. At the same time, they also promote technological development and research in communication terminals, medical devices, energy development, etc.

[0004] In battery technology, how to improve battery reliability is a technical problem that needs to be solved urgently. Summary of the Invention

[0005] The embodiments of the present application provide a battery and an electrical device, which can effectively improve the reliability of the battery.

[0006] In a first aspect, an embodiment of the present application provides a battery, comprising a battery cell group and a first housing. The first housing comprises a bottom wall and two first side walls arranged opposite each other along a first direction, the battery cell group being located between the two first side walls, the bottom wall being configured to support the battery cell group, and each of the first side walls being connected to the bottom wall via a first connecting portion; wherein the first side wall has a first side surface facing the battery cell group, and along the first direction, the minimum distance between the first side surface and the battery cell group is L1, and the minimum distance between the first connecting portion and the battery cell group is L2, satisfying L1≤L2.

[0007] In the above technical solution, the minimum distance between the first connecting part and the battery cell group is greater than or equal to the minimum distance between the first side surface and the battery cell group, so that the distance between the first connecting part and the battery cell group becomes larger. In this way, when the minimum distance between the first side surface and the battery cell group is used as the reliable electrical distance, the minimum distance between the first connecting part and the battery cell group can be greater than or equal to the reliable electrical distance, thereby reducing the occurrence of electrical breakdown between the first connecting part and the battery cell group, reducing the risk of short circuit between the first box and the battery cell group, and improving the reliability of the battery.

[0008] In some embodiments, 4 mm ≤ L1 ≤ 50 mm.

[0009] In the above technical solution, L1 is greater than or equal to 4 mm so that there is a reliable electrical distance between the first side surface and the battery cell group, thereby improving the reliability of the battery; when the size of the first box body is constant, L1 is less than or equal to 50 mm, which can reduce the distance between the battery cell group and the first side surface, so that a larger space can be used to accommodate the battery cell group, thereby accommodating a larger battery cell group, increasing the proportion of the battery cell group per unit volume, and improving the energy density of the battery; therefore, 4 mm ≤ L1 ≤ 50 mm can take into account both the reliability and energy density of the battery.

[0010] In some embodiments, 6 mm ≤ L1 ≤ 40 mm.

[0011] In the above technical solution, L1 greater than or equal to 6mm can further improve the reliability of the electrical distance between the first side and the battery cell group, thereby improving the reliability of the battery; L1 less than or equal to 40mm can further reduce the distance between the first side and the battery cell group, further reduce the volume of the battery case, and improve the energy density of the battery; therefore, 6mm≤L1≤40mm can further take into account both the reliability and energy density of the battery.

[0012] In some embodiments, the bottom wall has a first surface facing the battery cell, and the first side surface is perpendicular to the first surface.

[0013] In the above technical solution, the first side surface is perpendicular to the first surface, which is beneficial to improving the consistency of the distance between the first side surface and the battery cell group.

[0014] In some embodiments, the first side wall and the bottom wall are formed separately.

[0015] In the above technical solution, compared with the technical solution in which the first side wall and the bottom wall are integrally formed, after the first side wall and the bottom wall are separately formed, the first side wall and the bottom wall are connected by a first connecting portion. In this way, the position of the first connecting portion is not restricted by the first box forming process, thereby facilitating the first connecting portion to be set at a position away from the battery cell group to reduce the risk of short circuit between the first connecting portion and the battery cell group, which is beneficial to improving the reliability of the battery while reducing the difficulty of preparing the first box.

[0016] In some embodiments, the first side wall and the bottom wall are welded to form a first welding portion, and the first connecting portion is the first welding portion.

[0017] In the above technical solution, the first side wall and the bottom wall are welded, and welding can improve the connection strength between the first side wall and the bottom wall, thereby improving the overall structural strength of the first box body.

[0018] In some embodiments, the first side wall is a first beam roll-formed from a plate.

[0019] In the above technical solution, the first sidewall is a first beam formed by roll-forming a plate, which can obtain a first sidewall with higher structural strength, further improving the overall structural strength of the first box and enhancing the reliability of the battery. It also facilitates the processing and forming of the first sidewall and reduces the difficulty of manufacturing the first sidewall.

[0020] In some embodiments, the first beam includes a first wall portion, a second wall portion, a third wall portion and a fourth wall portion connected end to end in sequence, and the first wall portion, the second wall portion, the third wall portion and the fourth wall portion enclose a cavity; wherein, the first wall portion and the third wall portion are arranged opposite to each other along the first direction, the second wall portion and the fourth wall portion are arranged opposite to each other along the second direction, the side of the first wall portion facing the battery cell group is the first side surface, and the second direction is perpendicular to the first direction.

[0021] In the above technical solution, the first wall portion, the second wall portion, the third wall portion and the fourth wall portion are connected end to end in sequence to form a first beam, and the first wall portion, the second wall portion, the third wall portion and the fourth wall portion are enclosed to form a cavity. The cavity reduces the mass of the first beam, reduces the proportion of the first box body per unit mass, and increases the proportion of the battery cell group per unit mass, which can improve the energy density of the battery.

[0022] In some embodiments, the plate is connected at both ends.

[0023] In the above technical solution, the head and tail ends of the plate are connected, which can improve the structural strength of the first beam and the structural strength of the first box, thereby improving the reliability of the battery.

[0024] In some embodiments, the head and tail ends of the plate are welded to form a second welding portion.

[0025] In the above technical solution, welding the head and tail ends of the plate is beneficial to improving the structural strength of the first beam and improving the overall structural strength of the first box.

[0026] In some embodiments, the first beam is provided with a mounting portion.

[0027] In the above technical solution, the mounting portion facilitates installation or fixing of the battery to a desired position.

[0028] In some embodiments, the battery further includes a second box body, which together with the first box body defines an accommodating space for accommodating the battery cell group, and the second box body is connected to the first beam.

[0029] In the above technical solution, the second box body and the first box body jointly define a storage space for accommodating the battery cell group. The second box body and the first box body separate or isolate the storage space from the external environment. The second box body and the first box body create a relatively stable internal environment for the battery cell group, reducing the impact of substances in the external environment on the battery cell group, thereby improving the reliability of the battery.

[0030] In some embodiments, the first box body also includes two second side walls arranged opposite to each other along a third direction, the battery cell group is located between the two second side walls, and each second side wall and the bottom wall are connected by a second connecting portion; wherein, the second side wall has a second side surface facing the battery cell group, and along the first direction, the minimum distance between the second side surface and the battery cell group is L3, and the minimum distance between the second connecting portion and the battery cell group is L4, satisfying L3≤L4, and the third direction is perpendicular to the first direction.

[0031] In the above technical solution, the minimum distance between the second connection part and the battery cell group is greater than or equal to the minimum distance between the second side surface and the battery cell group, so that the distance between the second connection part and the battery cell group becomes larger. In this way, when the minimum distance between the second side surface and the battery cell group is used as the reliable electrical distance, the minimum distance between the second connection part and the battery cell group can be greater than or equal to the reliable electrical distance, thereby reducing the occurrence of electrical breakdown between the second connection part and the battery cell group, further reducing the risk of short circuit between the first box and the battery cell group, and thus improving the reliability of the battery.

[0032] In some embodiments, the second side wall is a second beam formed by roll forming of a plate.

[0033] In the above technical solution, the second sidewall is a second beam formed by roll-forming a plate, which can obtain a second sidewall with higher structural strength, further improving the overall structural strength of the first box and enhancing the reliability of the battery. It also facilitates the processing and forming of the second sidewall, reducing the difficulty of manufacturing the second sidewall.

[0034] In a second aspect, an embodiment of the present application provides an electric device, which includes a battery provided by any of the above embodiments, and the battery is used to power the electric device. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0036] FIG1 is a schematic structural diagram of a vehicle according to some embodiments of the present application;

[0037] FIG2 is a schematic structural diagram of a battery according to some embodiments of the present application;

[0038] FIG3 is an exploded schematic diagram of a battery according to some embodiments of the present application;

[0039] FIG4 is a cross-sectional view of a battery according to some embodiments of the present application;

[0040] FIG5 is an enlarged view of portion A in FIG4 ;

[0041] FIG6 is a cross-sectional view of batteries according to other embodiments of the present application;

[0042] FIG7 is an enlarged view of portion B in FIG6 ;

[0043] FIG8 is a schematic diagram of other embodiments of the first side wall in FIG7 ;

[0044] FIG9 is a schematic structural diagram of a first beam in some embodiments of the present application;

[0045] FIG10 is a schematic structural diagram of a first beam in some other embodiments of the present application;

[0046] FIG11 is a schematic diagram of a structure in which an insulating member is provided on the first side surface of some embodiments of the present application;

[0047] FIG12 is a schematic structural diagram of other embodiments of the first beam and the bottom wall in FIG5 ;

[0048] FIG13 is a cross-sectional view of the battery 100 according to some other embodiments of the present application taken from another perspective;

[0049] FIG14 is an enlarged view of portion C in FIG13 .

[0050] Icons: 100 - battery; 10 - battery cell group; 11 - battery cell; 20 - housing; 21 - first housing; 211 - bottom wall; 2111 - first surface; 2112 - raised portion; 212 - first side wall; 212a - first beam; 2121 - first wall; 21211 - first side; 2122 - second wall; 2123 - third wall; 2124 - fourth wall; 21241 - recess Part; 2125-seam; 2126-second welding part; 2127-mounting part; 213-second side wall; 213a-second beam; 2131-second side; 214-first connecting part; 215-second connecting part; 22-second box body; 23-insulating member; 24-locking member; 1000-vehicle; 200-motor; 300-controller; Y-first direction; Z-second direction; X-third direction.

[0051] The drawings are not drawn to scale. DETAILED DESCRIPTION

[0052] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0053] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

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

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

[0056] In the description of this application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly perpendicular, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0057] The term "or" in this application is merely a description of the association relationship between associated objects, indicating that two relationships may exist. For example, A or B can represent two situations: A exists alone, and B exists alone.

[0058] The term "plurality" used in this application refers to two or more (including two).

[0059] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0060] In this application, battery cells may include, but are not limited to, lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries. Battery cells include, but are not limited to, cylindrical, flat, rectangular, or other shapes. Battery cells are generally packaged in cylindrical, prismatic, and soft-pack shapes.

[0061] A battery cell consists of an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrodes. Metal ions (such as lithium ions) are inserted and removed from the positive and negative electrodes. The separator is placed between the positive and negative electrodes to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0062] The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as the positive electrode tab.

[0063] Taking lithium-ion batteries as an example, the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The positive electrode current collector can be a metal foil or a composite current collector. For example, as the metal foil, 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. can be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0064] The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode collector. The negative electrode collector not coated with the negative electrode active material layer protrudes from the negative electrode collector coated with the negative electrode active material layer. The negative electrode collector not coated with the negative electrode active material layer serves as the negative electrode tab.

[0065] The negative electrode current collector can be a metal foil or a composite current collector. For example, the metal foil can be silver-plated aluminum, silver-plated stainless steel, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium. The negative electrode active material can be carbon or silicon, for example.

[0066] To reduce the risk of tabs fusing due to high current, multiple positive tabs are stacked together, and multiple negative tabs are stacked together. The separator can be made of materials such as PP (polypropylene) or PE (polyethylene). Furthermore, the electrode assembly can be either a wound or laminated structure.

[0067] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or a battery pack. A battery generally includes a casing for enclosing one or more battery cells. The casing can reduce the effects of liquids or other foreign matter on the charging or discharging of the battery cells.

[0068] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0069] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are housed in the case.

[0070] In some embodiments, multiple battery cells can be first integrated into at least one battery module, which is then installed in a housing to form a battery pack. In this embodiment, auxiliary structural members such as crossbeams can be installed between the battery modules to improve the stability of the battery module installation in the housing.

[0071] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0072] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0073] The development of battery technology must take into account multiple design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, battery reliability must also be considered.

[0074] There is a risk of short circuit between the battery case and the battery cell group. Specifically, the case includes side walls and a bottom wall that supports the battery cell group. The side walls and the bottom wall are connected by a first connection portion. The case is usually formed by stamping. Due to the limitations of the forming method, the side walls and the bottom wall are connected by a chamfer (i.e., the first connection portion). The minimum distance between the chamfer and the battery cell group is smaller than the minimum distance between the side wall and the bottom wall. In such a case, the case is prepared with the minimum distance between the side wall and the battery cell group as the reliable electrical distance. Since the minimum distance between the chamfer and the battery cell group is smaller than the minimum distance between the side wall and the bottom wall, there is a risk of electrical breakdown between the chamfer and the battery cell group, resulting in a short circuit between the case and the battery cell group, affecting the reliability of the battery.

[0075] In view of this, in order to solve the problem that the short circuit between the box and the battery cell group affects the reliability of the battery, an embodiment of the present application provides a battery, in which the battery includes a first box and a battery cell group, the first box includes a bottom wall and a first side wall, the first side wall and the bottom wall are connected by a first connecting part, and the minimum distance between the first connecting part and the battery cell group is greater than or equal to the minimum distance between the first side wall and the battery cell group.

[0076] By ensuring that the minimum distance between the first connecting portion and the battery cell group is greater than or equal to the minimum distance between the first side wall and the battery cell group, the distance between the first connecting portion and the battery cell group is increased. Thus, when the minimum distance between the first side wall and the battery cell group is used as the reliable electrical distance, the minimum distance between the first connecting portion and the battery cell group can be greater than or equal to the reliable electrical distance, thereby reducing the risk of electrical breakdown between the first connecting portion and the battery cell group and the risk of a short circuit between the first housing and the battery cell group, thereby improving battery reliability.

[0077] The technical solutions disclosed in the embodiments of the present application are applicable to, but not limited to, batteries and electrical equipment using batteries.

[0078] Electrically powered equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be fuel-powered, gas-powered, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles, or extended-range vehicles. Spacecraft include aircraft, rockets, space shuttles, and spacecraft. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. 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.

[0079] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0080] Please refer to FIG1 , which is a schematic diagram of the structure of a vehicle 1000 according to some embodiments of the present application. A battery 100 is disposed inside the vehicle 1000 . The battery 100 can be disposed at the bottom, head, or tail of the vehicle 1000 . The battery 100 can be used to power the vehicle 1000 . For example, the battery 100 can serve as an operating power source for the vehicle 1000 .

[0081] The vehicle 1000 may further include a controller 300 and a motor 200 . The controller 300 is used to control the battery 100 to supply power to the motor 200 , for example, to meet the power requirements of the vehicle 1000 during startup, navigation, and driving.

[0082] In some embodiments of the present application, the battery 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0083] In some embodiments, please refer to Figures 2 and 3. Figure 2 is a schematic structural diagram of a battery 100 in some embodiments of the present application, and Figure 3 is a decomposed schematic diagram of a battery 100 in some embodiments of the present application. The battery 100 includes a battery cell group 10, and the battery cell group 10 includes a plurality of battery cells 11. Among them, the multiple battery cells 11 can be connected in series, in parallel, or in mixed connection. Among them, mixed connection means that the multiple battery cells 11 are both connected in series and in parallel. For example, as shown in Figure 3, the battery cell group 10 includes two columns of battery cells 11, and each column is arranged with a plurality of battery cells 11.

[0084] In some embodiments, the battery 100 may further include a busbar component (not shown), and the multiple battery cells 11 may be electrically connected via the busbar component to achieve series connection, parallel connection, or mixed connection of the multiple battery cells 11 .

[0085] The busbar component may be a metal conductor, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0086] In some embodiments, the battery 100 may further include a housing 20 for accommodating the battery cell group 10. The housing 20 may include a first housing 21 and a second housing 22, which cover each other to define a space for accommodating the battery cell group 10. The connection between the first housing 21 and the second housing 22 may be sealed by a sealing element (not shown), such as a sealing ring, sealant, or the like.

[0087] The first box body 21 and the second box body 22 can be of various shapes, such as a cuboid, a cube, an octahedron, etc. The first box body 21 can be a hollow structure with one side open, and the second box body 22 can also be a hollow structure with one side open. The open side of the second box body 22 covers the open side of the first box body 21, thereby forming a box body 20 with a storage space.

[0088] The first housing 21 is used to support the battery cell group 10. When the battery 100 is in use, the first housing 21 can be located at the bottom, in which case the first housing 21 is also referred to as the lower housing 20. The second housing 22 can be located above, in which case the second housing 22 is also referred to as the upper housing 20. In some implementations, to increase the load capacity of the first housing 21 to support the battery cell group 10, the first housing 21 can be made of metal, such as aluminum. In some embodiments, the second housing 22 can be made of plastic to reduce the mass of the second housing 22, thereby reducing the total mass of the housing 20 and increasing the proportion of the battery cell group 10 in the cell mass, thereby improving the energy density of the battery 100.

[0089] In some embodiments, the second box body 22 can also be eliminated, that is, the box body 20 of the battery 100 only has a lower box body 20, and the box body 20 is an open structure. Such a structure can reduce the total mass and total volume of the box body 20, thereby increasing the proportion of the battery cell group 10 per unit volume and unit mass, and improving the energy density of the battery 100.

[0090] When the first housing 21 is made of metal, to reduce the risk of a short circuit between the battery cell group 10 and the housing 20, a gap may be provided around the sides of the battery cell group 10 and the sidewalls of the first housing 21. That is, the battery cell group 10 and the sidewalls of the first housing 21 are insulated by air, ensuring a reliable electrical distance between the battery cell group 10 and the sidewalls of the first housing 21. To reduce the risk of a short circuit between the battery cell group 10 and the first housing 21, an insulating member 24 may be provided between the battery cell group 10 and the bottom wall 211 of the first housing 21. The material of the insulating member 24 includes, but is not limited to, silicone, rubber, etc.

[0091] The embodiment of the present application provides a battery 100 that can alleviate the problem of low reliability of the battery 100 caused by a short circuit between the battery case 20 and the battery cell group 10. The specific structure of the battery 100 is described in detail below with reference to the accompanying drawings.

[0092] FIG4 is a cross-sectional view of a battery 100 according to some embodiments of the present application; FIG5 is an enlarged view of section A in FIG4 .

[0093] 2 , 3 , 4 , and 5 , in some embodiments, a battery 100 includes a battery cell group 10 and a first housing 21 . The first housing 21 includes a bottom wall 211 and two first side walls 212 disposed opposite each other along a first direction Y. The battery cell group 10 is located between the two first side walls 212 . The bottom wall 211 is configured to support the battery cell group 10 . Each first side wall 212 is connected to the bottom wall 211 by a first connecting portion 214 . The first side wall 212 has a first side surface 21211 facing the battery cell group 10 . Along the first direction Y, the minimum distance between the first side surface 21211 and the battery cell group 10 is L1 , and the minimum distance between the first connecting portion 214 and the battery cell group 10 is L2 , satisfying L1 ≤ L2 .

[0094] The shape of the first box body 21 is adapted to the shape of the battery cell group 10 , and the first box body 21 can be constructed as a cuboid, a pentagonal body, a hexagonal body, etc. For example, as shown in FIG3 and FIG4 , the first box body 21 is a cuboid.

[0095] The first side wall 212 refers to a wall portion of the first box body 21 that is disposed opposite to the battery cell group 10 in the first direction Y.

[0096] When the first housing 21 is a rectangular parallelepiped, the first direction Y can be the length direction of the first housing 21, or the width direction of the first housing 21. If the first direction Y is the length direction of the first housing 21, the first sidewall 212 is a sidewall extending along the width direction of the first housing 21; if the first direction Y is the width direction of the first housing 21, the first sidewall 212 is a sidewall extending along the length direction of the first housing 21. For example, as shown in Figures 3 and 4, the first direction Y is the width direction of the first housing 21, and in this case, the first sidewall 212 is a sidewall extending along the length direction of the first housing 21.

[0097] It can be understood that the first side wall 212 can be a side wall of the first box body 21 in any direction.

[0098] The first side wall 212 and the bottom wall 211 are connected via a first connecting portion 214 . That is, a first connecting portion 214 is formed between the first side wall 212 and the bottom wall 211 .

[0099] The first side wall 212 and the bottom wall 211 can be prepared separately and then connected together by the first connecting portion 214, or the first side wall 212, the first connecting portion 214 and the bottom wall 211 can be formed integrally. The first connecting portion 214 can be in a variety of forms, as long as it can connect the first side wall 212 and the bottom wall 211. In the case where the first side wall 212 and the bottom wall 211 are prepared separately, the structure of the first connecting portion 214 can include but is not limited to welding, colloid, bolts, etc. In the case where the first side wall 212, the first connecting portion 214 and the bottom wall 211 are formed integrally, the first connecting portion 214 can be a corner between the first side wall 212 and the bottom wall 211 (as shown in FIG6 ).

[0100] The first sidewall 212 has a first side surface 21211 facing the battery cell group 10. Accordingly, the battery cell group 10 also has a surface facing the first sidewall 212. The position of the surface of the battery cell group 10 facing the first sidewall 212 is defined as a reference line P. Along the first direction Y, the distance from the first side surface 21211 to the reference line P is La, and the distance from the first side surface 21211 to the reference line P is Lb.

[0101] The minimum distance between the first side surface 21211 and the battery cell group 10 is L1 , that is, the minimum value of La is L1 .

[0102] The minimum distance between the first connecting portion 214 and the battery cell group 10 is L2 , that is, the minimum value of Lb is L2 .

[0103] 5 , from top to bottom, the distance between the first side surface 21211 and the battery cell group 10 is equal, La is a constant value, and L1 is equal to La. In FIG5 , the first connecting portion 214 is on the side of the first side surface 21211 away from the battery cell group 10 , so L2 is greater than L1.

[0104] For example, referring to Figures 6 and 7, Figure 7 is a cross-sectional view of a battery 100 according to other embodiments of the present application; Figure 7 is an enlarged view of section B in Figure 6. As shown in Figure 7, from top to bottom, the distance between the first side surface 21211 and the battery cell group 10 is constant, with La being a constant value and L1 being equal to La. From top to bottom, the distance between the first connecting portion 214 and the battery cell group 10 gradually increases, with Lb gradually increasing. The minimum distance L2 between the first connecting portion 214 and the battery cell group 10 is equal to the minimum distance L1 between the first side surface 21211 and the battery cell group 10.

[0105] For example, refer to Figure 8, which is a schematic structural diagram of other embodiments of the first side wall 212 of Figure 7. In Figure 8, the first side surface 21211 is arranged at an angle relative to the battery cell group 10. From top to bottom, the distance between the first side surface 21211 and the battery cell group 10 gradually decreases, and La gradually decreases. From top to bottom, the distance between the first connecting portion 214 and the battery cell group 10 gradually increases. The minimum distance L2 between the first connecting portion 214 and the battery cell group 10 is also equal to the minimum distance L1 between the first side surface 21211 and the battery cell group 10.

[0106] It should be noted that different batteries 100 have different voltages. Under different voltages, the distance of electrical breakdown is different. Therefore, the electrical distance that satisfies the reliability of the first side surface 21211 and the battery cell group 10 is not a constant value.

[0107] In this embodiment, the minimum distance L2 between the first connecting portion 214 and the battery cell group 10 is greater than or equal to the minimum distance L1 between the first side surface 21211 and the battery cell group 10. This increases the distance between the first connecting portion 214 and the battery cell group 10, thereby moving the first connecting portion 214 away from the battery cell group 10. In this way, when the minimum distance between the first side surface 21211 and the battery cell group 10 is used as the reliable electrical distance, the minimum distance between the first connecting portion 214 and the battery cell group 10 can be greater than or equal to the reliable electrical distance, thereby reducing the occurrence of electrical breakdown between the first connecting portion 214 and the battery cell group 10, reducing the risk of short circuit between the first casing 21 and the battery cell group 10, and improving the reliability of the battery 100.

[0108] In some embodiments, 4 mm ≤ L1 ≤ 50 mm.

[0109] For example, L1 can be 4 mm, 6 mm, 7 mm, 9 mm, 11 mm, 13 mm, 15 mm, 18 mm, 20 mm, 23 mm, 27 mm, 30 mm, 35 mm, 39 mm, 42 mm, 45 mm, 47 mm, 50 mm, etc. Since it is impossible to list all values ​​between 4 mm and 50 mm, several intermediate values ​​are listed as examples. It is understandable that any value between these values ​​can be used as the minimum distance L1 between the first side surface 21211 and the battery cell group 10.

[0110] It should be noted that the space inside the first housing 21 consists of two parts: one part accommodates the battery cell group 10, and the other part is the space between the sidewalls of the first housing 21 and the battery cell group 10. This space is used to insulate the battery cell group 10 from the sidewalls. A larger L1 improves the insulation between the battery cell group 10 and the sidewalls. For a given size of the first housing 21, a smaller L1 increases the space available to accommodate the battery cell group 10 and reduces the distance between the battery cell group 10 and the sidewalls.

[0111] In this embodiment, L1 is greater than or equal to 4 mm so that there is a reliable electrical distance between the first side surface 21211 and the battery cell group 10, thereby improving the reliability of the battery 100; when the size of the first box body 21 is constant, L1 is less than or equal to 50 mm, which can reduce the distance between the battery cell group 10 and the first side surface 21211, thereby increasing the space for accommodating the battery cell group 10, thereby accommodating a larger battery cell group 10, increasing the proportion of the battery cell group 10 per unit volume, and improving the energy density of the battery 100; therefore, 4 mm ≤ L1 ≤ 50 mm can take into account both the reliability and energy density of the battery 100.

[0112] In some embodiments, 6 mm ≤ L1 ≤ 40 mm.

[0113] For example, L1 can be 6 mm, 7 mm, 9 mm, 11 mm, 13 mm, 15 mm, 16 mm, 18 mm, 20 mm, 23 mm, 25 mm, 27 mm, 30 mm, 32 mm, 35 mm, 37 mm, 39 mm, 40 mm, etc. Since it is impossible to list all values ​​between 6 mm and 40 mm, several intermediate values ​​are listed as examples. It is understood that any value between these values ​​can be used as the minimum distance L1 between the first side surface 21211 and the battery cell group 10.

[0114] In this embodiment, L1 is greater than or equal to 6 mm, which can further improve the reliability of the electrical distance between the first side 21211 and the battery cell group 10, and improve the reliability of the battery 100; when the size of the first box 21 is constant, L1 is less than or equal to 40 mm, which can further reduce the distance between the battery cell group 10 and the first side 21211, increase the space for accommodating the battery cell group 10, increase the proportion of the battery cell group 10 per unit volume, and improve the energy density of the battery 100; therefore, 6 mm ≤ L1 ≤ 40 mm can further take into account both the reliability and energy density of the battery 100.

[0115] 5 and 7 , in some embodiments, the bottom wall 211 has a first surface 2111 facing the battery cell 11 , and the first side surface 21211 is perpendicular to the first surface 2111 .

[0116] For example, in Figures 5 and 7, the first side surface 21211 is perpendicular to the first surface 2111, and the distance between the first side surface 21211 and the battery cell group 10 is equal everywhere from top to bottom. The distance between the first side surface 21211 and the battery cell group 10 measured at any position is the minimum distance L1 between the first side surface 21211 and the battery cell group 10.

[0117] In this embodiment, the first side surface 21211 is perpendicular to the first surface 2111 , which helps to improve the consistency of the distance between the first side surface 21211 and the battery cell group 10 .

[0118] 4 and 5 , the first side wall 212 and the bottom wall 211 are formed separately. That is, the first side wall 212 and the bottom wall 211 can be prepared separately.

[0119] After the first side wall 212 and the bottom wall 211 are formed separately, they can be fixedly connected by bonding, welding, bolts, etc. If the first side wall 212 and the bottom wall 211 are bonded together by adhesive, the adhesive is the first connecting portion 214; if the first side wall 212 and the bottom wall 211 are welded together, the weld mark between the first side wall 212 and the bottom wall 211 is the first connecting portion 214; if the first side wall 212 and the bottom wall 211 are bolted together, the bolt is the first connecting portion 214.

[0120] Compared with the technical solution in which the first side wall 212 and the bottom wall 211 are integrally formed, after the first side wall 212 and the bottom wall 211 are separately formed, the first side wall 212 and the bottom wall 211 are then connected by the first connecting portion 214. In this way, the position of the first connecting portion 214 is not restricted by the molding process of the first box body 21, thereby facilitating the setting of the first connecting portion 214 to a position away from the battery cell group 10, so as to reduce the risk of short circuit between the first connecting portion 214 and the battery cell group 10, which is beneficial to improving the reliability of the battery 100 while reducing the difficulty of preparing the first box body 21.

[0121] In some embodiments, the first side wall 212 and the bottom wall 211 are welded to form a first welding portion, and the first connecting portion 214 is the first welding portion.

[0122] It can be understood that the first side wall 212 and the bottom wall 211 are welded to form a first welding portion, and the first welding portion is a weld mark formed by welding the first side wall 212 and the bottom wall 211 .

[0123] The first side wall 212 and the bottom wall 211 are welded, and welding can improve the connection strength between the first side wall 212 and the bottom wall 211 , thereby improving the overall structural strength of the first box body 21 .

[0124] 9 , which is a schematic structural diagram of the first beam 212 a in some embodiments of the present application, in some embodiments, the first sidewall 212 is a first beam 212 a formed by roll-forming a plate.

[0125] The first beam 212 a is a load-bearing component, and the first beam 212 a can improve the load and bearing capacity of the first box body 21 .

[0126] The first beam 212 a may be configured as a long strip, and the shape of the cross section of the first beam 212 a includes but is not limited to a rectangle, a trapezoid, a hexagon, and the like.

[0127] The first side wall 212 is a first beam 212a formed by roll-forming a plate, which can provide a first side wall 212 with higher structural strength, further improving the overall structural strength of the first box 21 and the reliability of the battery 100. It also facilitates the processing and forming of the first side wall 212, reducing the difficulty of preparing the first side wall 212.

[0128] 5 and 9 , in some embodiments, the first beam 212a includes a first wall portion 2121, a second wall portion 2122, a third wall portion 2123, and a fourth wall portion 2124 connected end to end in sequence, and the first wall portion 2121, the second wall portion 2122, the third wall portion 2123, and the fourth wall portion 2124 enclose a cavity; wherein the first wall portion 2121 and the third wall portion 2123 are arranged opposite to each other along a first direction Y, the second wall portion 2122 and the fourth wall portion 2124 are arranged opposite to each other along a second direction Z, and the side of the first wall portion 2121 facing the battery cell group 10 is a first side surface 21211, and the second direction Z is perpendicular to the first direction Y.

[0129] 9 and 5 , the first wall 2121, the second wall 2122, the third wall 2123, and the fourth wall 2124 together form a square. The first wall is adjacent to the battery pack 10, and the fourth wall is adjacent to the bottom wall 211. The fourth wall is connected to the bottom wall 211 via a first connecting portion 214.

[0130] In this embodiment, the first wall portion 2121, the second wall portion 2122, the third wall portion 2123 and the fourth wall portion 2124 are connected end to end in sequence to form a first beam 212a. The first wall portion 2121, the second wall portion 2122, the third wall portion 2123 and the fourth wall portion 2124 are enclosed to form a cavity. The cavity reduces the mass of the first beam 212a, reduces the proportion of the first box body 21 per unit mass, and increases the proportion of the battery cell group 10 per unit mass, which can improve the energy density of the battery 100.

[0131] 9 and 10 , FIG10 is a schematic diagram of the structure of the first beam 212 a according to some other embodiments of the present application. In some embodiments, the head and tail ends of the plate are connected.

[0132] It can be understood that along the rolling direction, the plate has a head end and a tail end, and a joint 2125 is formed between the head end and the tail end of the first beam 212a after roll forming. The joint 2125 can be filled with colloid, solder, etc. to achieve connection between the head and tail ends of the plate.

[0133] The connection of the head and tail ends of the plate can improve the structural strength of the first beam 212 a and the structural strength of the first box body 21 , thereby improving the reliability of the battery 100 .

[0134] 10 , in some embodiments, the head and tail ends of the plate are welded to form a second welding portion 2126 .

[0135] It is understood that the plate has a head end and a tail end along the rolling direction. A seam 2125 is formed between the head end and the tail end of the roll-formed first beam 212a. A weld mark is formed at the seam 2125, which is the second weld portion 2126. The head and tail ends of the plate can be welded by melting the seam 2125 to form the second weld portion 2126, or by filling the seam 2125 with solder to form the second weld portion 2126.

[0136] When the first beam 212a includes a first wall portion 2121, a second wall portion 2122, a third wall portion 2123, and a fourth wall portion 2124 connected end to end, the joints 2125 formed at the end of the plate can be located on any of the wall portions of the first beam 212a. For example, as shown in Figures 9 and 10, the joints 2125 formed at the end of the plate are located on the third wall portion 2123, and accordingly, the second welded portion 2126 is also located on the third wall portion 2123.

[0137] In this embodiment, welding the head and tail ends of the plate is beneficial to improving the structural strength of the first beam 212 a and improving the overall structural strength of the first box body 21 .

[0138] In some embodiments, the material of the first beam 212a is steel.

[0139] In some embodiments, the material of the bottom wall 211 is aluminum.

[0140] 2 , in some embodiments, the first beam 212 a is provided with a mounting portion 2127 .

[0141] The mounting portion 2127 is a structure for mounting or fixing the battery 100 to a desired location. For example, the mounting portion 2127 is used to connect to the sheet metal of the vehicle body. The mounting portion 2127 facilitates mounting or fixing the battery 100 to a desired location.

[0142] The mounting portion 2127 may have various structural forms, including but not limited to mounting holes, sleeves, angle pieces, handles, etc. For example, as shown in FIG2 , the mounting portion 2127 is a handle.

[0143] In some embodiments, when the first beam 212 a includes a first wall portion 2121 , a second wall portion 2122 , a third wall portion 2123 and a fourth wall portion 2124 connected end to end, the mounting portion 2127 is provided on the second wall portion 2122 .

[0144] Referring to Figure 11 , a schematic diagram illustrating a structure in which an insulating member 24 is disposed on the first side 21211 of some embodiments of the present application. In some embodiments, the battery 100 further includes an insulating member 24 disposed on the first side 21211 to further reduce the risk of short circuits between the battery cell group 10 and the first sidewall 212 and improve the reliability of the battery 100.

[0145] Referring to Figure 12 , Figure 12 is a schematic structural diagram of other embodiments of the first beam 212a and bottom wall 211 in Figure 5 . In some embodiments, a recessed portion 21241 is provided on the side of the first beam 212a facing the bottom wall 211, and a raised portion 2112 is provided on the side of the bottom wall 211 facing the first beam 212a. The recessed portion 21241 and the raised portion 2112 abut against each other along the first direction Y. The raised portion 2112 cooperates with the recessed portion 21241 to restrict movement of the first beam 212a in a direction toward the battery cell group 10.

[0146] In some embodiments, a plurality of mounting portions 2127 are provided, and the plurality of mounting portions 2127 are arranged at intervals along the second direction Z.

[0147] 2 , 3 and 4 , in some embodiments, the battery 100 further includes a second box body 22 , which together with the first box body 21 defines an accommodating space for accommodating the battery cell group 10 , and the second box body 22 is connected to the first beam 212 a .

[0148] Optionally, the second box body 22 and the first beam 212a are detachably connected via a locking member 23, which includes but is not limited to a bolt, a screw, etc. The second box body 22 and the first beam 212a can also be detachably connected via a buckle.

[0149] The shape of the second box body 22 can be varied, as long as the shape of the second box body 22 is compatible with the shape of the first box body 21 and can accommodate the battery cell group 10. For example, as shown in FIG3 , the first box body 21 and the second box body 22 are both configured as rectangular parallelepipeds.

[0150] In this embodiment, the second box body 22 and the first box body 21 jointly define a storage space for accommodating the battery cell group 10. The second box body 22 and the first box body 21 separate or isolate the storage space from the external environment. The second box body 22 and the first box body 21 create a relatively stable internal environment for the battery cell group 10, reducing the impact of substances in the external environment on the battery cell group 10, thereby improving the reliability of the battery 100.

[0151] In some implementations, the second housing 22 is made of an insulating material to reduce the risk of short circuit between the battery cell group 10 and the second housing 22. Optionally, the second housing 22 is made of plastic.

[0152] FIG13 is a cross-sectional view of the battery 100 according to some other embodiments of the present application taken from another viewing angle, and FIG14 is an enlarged view of portion C in FIG13 .

[0153] 3, 13, and 14, in some embodiments, the first housing 21 further includes two second side walls 213 disposed opposite each other along a third direction X. The battery cell group 10 is located between the two second side walls 213. Each second side wall 213 is connected to the bottom wall 211 via a second connecting portion 215. The second side wall 213 has a second side surface 2131 facing the battery cell group 10. Along the first direction Y, the minimum distance between the second side surface 2131 and the battery cell group 10 is L3, and the minimum distance between the second connecting portion 215 and the battery cell group 10 is L4, satisfying L3 ≤ L4. The third direction X is perpendicular to the first direction Y.

[0154] The second side wall 213 refers to a wall portion of the first box body 21 disposed opposite to the battery cell group 10 in the third direction X.

[0155] When the first box body 21 is a rectangular parallelepiped, the third direction X may be the length direction of the first box body 21, or the third direction X may be the width direction of the first box body 21. For example, the first direction Y is the width direction of the first box body 21, the third direction X is the length direction of the second box body 22, the first side wall 212 is a side wall extending along the length direction of the first box body 21, and the second side wall 213 is a side wall extending along the width direction of the second box body 22.

[0156] The second side wall 213 and the bottom wall 211 are connected via a second connecting portion 215 . That is, a second connecting portion 215 is formed between the second side wall 213 and the bottom wall 211 .

[0157] The second side wall 213 and the bottom wall 211 can be prepared separately and then connected together by the second connecting portion 215, or the second side wall 213, the second connecting portion 215 and the bottom wall 211 can be formed integrally. The second connecting portion 215 can be in various forms, as long as it can connect the second side wall 213 and the bottom wall 211. In the case where the second side wall 213 and the bottom wall 211 are prepared separately, the structure of the second connecting portion 215 can include but is not limited to welding, colloid, bolts, etc. In the case where the second side wall 213, the second connecting portion 215 and the bottom wall 211 are formed integrally, the second connecting portion 215 can be a corner between the second side wall 213 and the bottom wall 211 (not shown in the figure).

[0158] The second sidewall 213 has a first side surface 21211 facing the battery cell group 10. Accordingly, the battery cell group 10 also has a surface facing the second sidewall 213. The position of the surface of the battery cell group 10 facing the second sidewall 213 is defined as a reference line F. The minimum distance between the first side surface 21211 and the reference line F is L3, and the distance between the first side surface 21211 and the reference line F is L4.

[0159] In this embodiment, the minimum distance between the second connecting portion 215 and the battery cell group 10 is greater than or equal to the minimum distance between the second side surface 2131 and the battery cell group 10, so that the distance between the second connecting portion 215 and the battery cell group 10 becomes larger. In this way, when the minimum distance between the second side surface 2131 and the battery cell group 10 is used as the reliable electrical distance, the minimum distance between the second connecting portion 215 and the battery cell group 10 can be greater than or equal to the reliable electrical distance, thereby reducing the occurrence of electrical breakdown between the second connecting portion 215 and the battery cell group 10, further reducing the risk of short circuit between the first box body 21 and the battery cell group 10, and thus improving the reliability of the battery 100.

[0160] In some embodiments, the second sidewall 213 is a second beam 213 a formed by roll-forming a plate.

[0161] The second beam 213 a is a load-bearing component, and the second beam 213 a can increase the load and bearing capacity of the first box body 21 .

[0162] The second beam 213 a may be configured as a long strip, and the shape of the cross section of the second beam 213 a includes but is not limited to a rectangle, a trapezoid, a hexagon, and the like.

[0163] In this embodiment, the second side wall 213 is a second beam 213a formed by roll-forming a plate, which can provide a second side wall 213 with higher structural strength, further improving the overall structural strength of the first box 21 and the reliability of the battery 100. It also facilitates the processing and forming of the second side wall 213, reducing the difficulty of manufacturing the second side wall 213.

[0164] In some embodiments, the second beam 213a is connected to the second box body 22. Optionally, the second beam 213a is detachably connected to the second box body 22 via a locking member 23.

[0165] In some embodiments, the second beam 213a can have the same structure as the first beam 212a, and the second connecting portion 215 can have the same structure as the first connecting portion 214. For the sake of brevity, the specific structures of the second beam 213a and the second connecting portion 215 are not repeated in this application.

[0166] An embodiment of the present application further provides an electric device, which includes the battery 100 provided in any of the above embodiments, and the battery 100 is used to power the electric device.

[0167] The embodiment of the present application further provides a battery 100 , which includes a first box body 21 , a second box body 22 , and a battery cell group 10 . The second box body 22 and the first box body 21 together define a storage space for accommodating the battery cell group 10 .

[0168] The first housing 21 includes a bottom wall 211, two first side walls 212 arranged opposite each other along a first direction Y, and two second side walls 213 arranged opposite each other along a third direction X. The battery cell group 10 is located between the two first side walls 212, and the battery cell group 10 is located between the two second side walls 213. The bottom wall 211 is used to support the battery cell group 10. Each first side wall 212 is connected to the bottom wall 211 by a first connecting portion 214, and each second side wall 213 is connected to the bottom wall 211 by a second connecting portion 215. The first side wall 212 has a first side surface 21211 facing the battery cell group 10. Along the first direction Y, the minimum distance between the first side surface 21211 and the battery cell group 10 is L1, and the minimum distance between the first connecting portion 214 and the battery cell group 10 is L2, satisfying L1≤L2. The second sidewall 213 has a second side surface 2131 facing the battery cell group 10. Along the first direction Y, the minimum distance between the second side surface 2131 and the battery cell group 10 is L3, and the minimum distance between the second connection portion 215 and the battery cell group 10 is L4, satisfying L3 ≤ L4. The bottom wall 211 has a first surface 2111 facing the battery cell 11. The first side surface 21211 is perpendicular to the first surface 2111, and the second side surface 2131 is perpendicular to the first surface 2111. The first sidewall 212 is a first beam 212a roll-formed from a sheet metal, and the second sidewall 213 is a second beam 213a roll-formed from a sheet metal. The first beam 212a is welded to the bottom wall 211 to form a first welded portion, and the second beam 213a is welded to the bottom wall 211 to form a second welded portion 2126. The first welded portion is the first connection portion 214, and the second welded portion 2126 is the second connection portion 215. The first beam 212a includes a first wall portion 2121, a second wall portion 2122, a third wall portion 2123, and a fourth wall portion 2124, which are connected end to end. The first wall portion 2121, the second wall portion 2122, the third wall portion 2123, and the fourth wall portion 2124 enclose a cavity. The first wall portion 2121 and the third wall portion 2121 are disposed opposite each other along a first direction Y, and the second wall portion 2122 and the fourth wall portion 2124 are disposed opposite each other along a second direction Z. The side of the first wall portion 2121 facing the battery cell pack 10 is a first side surface 21211, and the second direction Z is perpendicular to the first direction Y. The end and end ends of the plate are welded together to form a second welded portion 2126. The first beam 212a is provided with a mounting portion 2127. The second beam 213a has the same structure as the first beam 212a. The third direction X, the first direction Y, and the second direction Z are perpendicular to each other.

[0169] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0170] The above embodiments are intended only to illustrate the technical solutions of this application and are not intended to limit this application. Those skilled in the art will appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this application are intended to be within the scope of protection of this application.

Claims

1. A battery, characterized in that: include: Battery cell group; A first box body includes a bottom wall and two first side walls arranged opposite to each other along a first direction, the battery cell group is located between the two first side walls, the bottom wall is used to support the battery cell group, and each of the first side walls is connected to the bottom wall by a first connecting portion; The first side wall has a first side surface facing the battery cell group. Along the first direction, the minimum distance between the first side surface and the battery cell group is L1, and the minimum distance between the first connecting portion and the battery cell group is L2, satisfying L1≤L2.

2. The battery according to claim 1, characterized in that 4mm≤L1≤50mm.

3. The battery according to claim 2, characterized in that 6mm≤L1≤40mm.

4. The battery according to any one of claims 1 to 3, characterized in that The bottom wall has a first surface facing the battery cell, and the first side surface is perpendicular to the first surface.

5. The battery according to any one of claims 1 to 4, characterized in that: The first side wall and the bottom wall are formed separately.

6. The battery according to claim 5, characterized in that The first side wall and the bottom wall are welded to form a first welding portion, and the first connecting portion is the first welding portion.

7. The battery according to claim 5 or 6, characterized in that The first side wall is a first beam formed by roll forming of a plate.

8. The battery according to claim 7, characterized in that The first beam includes a first wall portion, a second wall portion, a third wall portion, and a fourth wall portion connected end to end in sequence, wherein the first wall portion, the second wall portion, the third wall portion, and the fourth wall portion enclose a cavity; The first wall portion and the third wall portion are arranged opposite to each other along the first direction, the second wall portion and the fourth wall portion are arranged opposite to each other along the second direction, the side of the first wall portion facing the battery cell group is the first side surface, and the second direction is perpendicular to the first direction.

9. The battery according to claim 7 or 8, characterized in that The head and tail ends of the plate are connected.

10. The battery according to any one of claims 7 to 9, characterized in that: The head and tail ends of the plate are welded to form a second welding portion.

11. The battery according to any one of claims 7 to 10, characterized in that: The first beam is provided with a mounting portion.

12. The battery according to any one of claims 7 to 11, characterized in that: The battery further comprises: The second box body, together with the first box body, defines an accommodating space for accommodating the battery cell group, and the second box body is connected to the first beam.

13. The battery according to any one of claims 1 to 12, characterized in that: The first box body further includes two second side walls arranged opposite to each other along a third direction, the battery cell group is located between the two second side walls, and each second side wall is connected to the bottom wall via a second connecting portion; The second side wall has a second side surface facing the battery cell group. Along the first direction, the minimum distance between the second side surface and the battery cell group is L3, and the minimum distance between the second connecting portion and the battery cell group is L4, satisfying L3≤L4. The third direction is perpendicular to the first direction.

14. The battery according to claim 13, characterized in that The second side wall is a second beam formed by roll forming of a plate.

15. An electrical device, characterized in that: The battery comprises the battery according to any one of claims 1 to 14, and the battery is used to supply power to the electrical device.

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