Battery and electric equipment

Abstract

The utility model discloses a battery and electric equipment. The battery comprises a battery monomer group and a first box body, the first box body comprises a bottom wall and two first side walls which are oppositely arranged along a first direction, the battery monomer group is positioned between the two first side walls, the bottom wall is used for bearing the battery monomer group, and each first side wall is connected with the bottom wall through a first connecting part; wherein the first side wall is provided with a first side surface facing the battery monomer group, along the first direction, the minimum distance between the first side surface and the battery monomer group is L1, the minimum distance between the first connecting part and the battery monomer group is L2, and L1 is smaller than or equal to L2, so that the reliability of the battery can be effectively improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery and an electrical device. Background Art

[0002] With the development of new energy technology, batteries are being used more and more widely. Batteries have high energy density, high safety, long service life, and are green and 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 equipment, etc. At the same time, they also promote technical development and research in communications, medical equipment, energy development, etc.

[0003] In battery technology, how to improve battery reliability is a technical problem that needs to be solved urgently. Utility Model Content

[0004] The embodiments of the present application provide a battery and an electrical device, which can effectively improve the reliability of the battery.

[0005] In a first aspect, an embodiment of the present application provides a battery, the battery comprising a battery cell group and a first box. The first box comprises 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 and the bottom wall are connected by 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.

[0006] 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 a 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.

[0007] In some embodiments, 4 mm ≤ L1 ≤ 50 mm.

[0008] In the above technical solution, L1 is greater than or equal to 4mm so that there is a reliable electrical distance between the first side 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 50mm, which can reduce the distance between the battery cell group and the first side, 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, 4mm≤L1≤50mm can take into account both the reliability and energy density of the battery.

[0009] In some embodiments, 6 mm ≤ L1 ≤ 40 mm.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] In some embodiments, the first side wall and the bottom wall are formed separately.

[0014] 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 limited by the first box body forming process, thereby facilitating the first connecting portion to be set to 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 body.

[0015] 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.

[0016] 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.

[0017] In some embodiments, the first side wall is a first beam roll-formed from a plate.

[0018] In the above technical solution, the first side wall is a first beam formed by roll forming of a plate, which can obtain a first side wall with higher structural strength, further improve the overall structural strength of the first box, and improve the reliability of the battery. At the same time, it is conducive to the processing and forming of the first side wall, and reduces the difficulty of preparing the first side wall.

[0019] 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 in sequence end to end, 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.

[0020] 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.

[0021] In some embodiments, the plate is connected at both ends.

[0022] 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.

[0023] In some embodiments, the head and tail ends of the plate are welded to form a second welding portion.

[0024] 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 body.

[0025] In some embodiments, the first beam is provided with a mounting portion.

[0026] In the above technical solution, the mounting portion facilitates installation or fixing of the battery to a desired position.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] In the above technical solution, the minimum distance between the second connecting 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 connecting 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 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 second connecting 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.

[0031] In some embodiments, the second side wall is a second beam roll-formed from a plate.

[0032] In the above technical solution, the second side wall is a second beam formed by rolling a plate, which can obtain a second side wall with higher structural strength, further improve the overall structural strength of the first box, and improve the reliability of the battery. At the same time, it is conducive to the processing and forming of the second side wall, and reduces the difficulty of preparing the second side wall.

[0033] In a second aspect, an embodiment of the present application provides an electric device, the electric device comprising a battery provided by any of the above embodiments, and the battery is used to power the electric device. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. 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 related drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 A schematic diagram of the structure of a vehicle according to some embodiments of the present application;

[0036] Figure 2 A schematic diagram of the structure of a battery in some embodiments of the present application;

[0037] Figure 3 An exploded schematic diagram of a battery according to some embodiments of the present application;

[0038] Figure 4 A cross-sectional view of a battery according to some embodiments of the present application;

[0039] Figure 5 for Figure 4 Enlarged view of part A in the middle;

[0040] Figure 6 are cross-sectional views of batteries according to other embodiments of the present application;

[0041] Figure 7 for Figure 6 Enlarged view of middle part B;

[0042] Figure 8 for Figure 7 Schematic diagrams of other embodiments of the first side wall;

[0043] Fig. 9 A schematic diagram of the structure of a first beam in some embodiments of the present application;

[0044] Fig.10 A schematic diagram of the structure of a first beam in some other embodiments of the present application;

[0045] Fig.11 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;

[0046] Fig.12 for Figure 5 Structural schematic diagrams of other embodiments of the first beam and the bottom wall;

[0047] Fig.13 A cross-sectional view of a battery 100 according to some other embodiments of the present application taken from another viewing angle;

[0048] Fig.14 for Fig.13 Enlarged view of part C in the middle.

[0049] Icon: 100-battery; 10-battery cell group; 11-battery cell; 20-box; 21-first box; 211-bottom wall; 2111-first surface; 2112-protrusion; 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.

[0050] The drawings are not drawn to scale. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0052] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. 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 and secondary relationship.

[0053] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0054] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0055] In the description of the present application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present 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 vertical, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0056] The term "or" in this application is merely a description of the association relationship of associated objects, indicating that two relationships may exist. For example, A or B may represent two situations: A exists alone, and B exists alone.

[0057] The term "plurality" used in the present application refers to two or more (including two).

[0058] In the embodiments of the present application, the same reference numerals represent 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 the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0059] In the present 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, etc. Battery cells include but are not limited to cylinders, flat bodies, rectangular parallelepipeds or other shapes, etc. Battery cells generally include cylindrical battery cells, square battery cells and soft-pack battery cells, etc., according to the packaging method.

[0060] A battery cell includes 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 mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. Metal ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive electrode sheet and the negative electrode sheet from short-circuiting, while allowing active ions to pass through.

[0061] 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 a positive electrode ear.

[0062] 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 collector can be a metal foil or a composite current collector. For example, as a 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 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.).

[0063] 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 a negative electrode tab.

[0064] The negative electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with silver-plated surface, stainless steel with silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The negative electrode active material may be carbon or silicon, etc.

[0065] In order to ensure that a large current can pass without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the isolation film can be PP (polypropylene) or PE (polyethylene). In addition, the electrode assembly can be a wound structure or a laminated structure.

[0066] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells. The box can reduce the impact of liquid or other foreign matter on the charging or discharging of the battery cells.

[0067] 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.

[0068] 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 accommodated in the case.

[0069] In some embodiments, multiple battery cells may be first integrated into at least one battery module, and then the battery module may be installed in a box to form a battery pack. In this embodiment, auxiliary structural members such as beams may be provided between the battery modules to improve the installation stability of the battery module in the box.

[0070] 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.

[0071] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0072] The development of battery technology must take into account many 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.

[0073] There is a risk of short circuit between the battery box and the battery cell group. Specifically, the box includes a side wall and a bottom wall that supports the battery cell group, and the side wall and the bottom wall are connected by a first connection portion. The box is usually formed by stamping. Limited by the forming method, the side wall and the bottom wall are connected by a chamfer (i.e., the first connection portion), and 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 box, the box 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 box and the battery cell group, affecting the reliability of the battery.

[0074] 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.

[0075] By making the minimum distance between the first connection part and the battery cell group greater than or equal to the minimum distance between the first side wall and the battery cell group, the distance between the first connection 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 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 first connection part and the battery cell group, the risk of short circuit between the first box and the battery cell group, and improving the reliability of the battery.

[0076] The technical solutions disclosed in the embodiments of the present application are applicable to but not limited to batteries and electrical equipment using batteries.

[0077] Electrical equipment can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and electric tools, etc. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.

[0078] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0079] Please refer to Figure 1 , Figure 1 1 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 may be disposed at the bottom, head, or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000. For example, the battery 100 may be used as an operating power source for the vehicle 1000.

[0080] The vehicle 1000 may further include a controller 300 and a motor 200 , wherein 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 starting, navigating, and driving the vehicle 1000 .

[0081] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0082] In some embodiments, please refer to Figure 2 and Figure 3 , Figure 2 is a schematic diagram of the structure of a battery 100 according to some embodiments of the present application, Figure 3 1 is a schematic diagram of an exploded view of a battery 100 according to 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. The plurality of battery cells 11 may be connected in series, in parallel, or in mixed connection. Mixed connection means that the plurality of battery cells 11 are connected in series and in parallel. For example, Figure 3 As shown, the battery cell group 10 includes battery cells 11 arranged in two columns, each column having a plurality of battery cells 11 arranged therein.

[0083] 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 .

[0084] The busbar component may be a metal conductor, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0085] In some embodiments, the battery 100 may further include a box 20, which is used to accommodate the battery cell group 10. The box 20 may include a first box 21 and a second box 22, which cover each other to define an accommodation space for accommodating the battery cell group 10. Of course, the connection between the first box 21 and the second box 22 may be sealed by a sealing element (not shown), which may be a sealing ring, a sealant, etc.

[0086] The first box body 21 and the second box body 22 can be in 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, and 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.

[0087] The first box 21 is used to carry the battery cell group 10. When the battery 100 is in use, the first box 21 may be located at the bottom, in which case the first box 21 is also called the lower box 20, and the second box 22 may be located at the top, in which case the second box 22 is also called the upper box 20. In some implementations, in order to increase the load of the first box 21 to carry the battery cell group 10, the material of the first box 21 may be metal, such as aluminum. In some embodiments, the material of the second box 22 may be plastic to reduce the mass of the second box 22, reduce the total mass of the box 20, and increase the proportion of the battery cell group 10 in the single mass, thereby increasing the energy density of the battery 100.

[0088] 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.

[0089] When the material of the first box body 21 is metal, in order to reduce the risk of short circuit between the battery cell group 10 and the box body 20, a gap may be set around the battery cell group 10 and the side wall of the first box body 21, that is, the battery cell group 10 and the side wall of the first box body 21 are insulated by air, so that there is a reliable electrical distance between the battery cell group 10 and the side wall of the first box body 21. In order to reduce the risk of short circuit between the battery cell group 10 and the first box body 21, an insulating member 24 may be set between the battery cell group 10 and the bottom wall 211 of the first box body 21, and the material of the insulating member 24 includes but is not limited to silicone, rubber, etc.

[0090] The embodiment of the present application provides a battery 100, which 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.

[0091] Figure 4 A cross-sectional view of a battery 100 according to some embodiments of the present application; Figure 5 for Figure 4 Enlarged view of part A in the middle.

[0092] Reference Figure 2 , Figure 3 , Figure 4 and Figure 5In some embodiments, the battery 100 includes a battery cell group 10 and a first box body 21. The first box body 21 includes a bottom wall 211 and two first side walls 212 arranged opposite to 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 used to support the battery cell group 10. Each first side wall 212 and the bottom wall 211 are connected by a first connecting portion 214; wherein 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.

[0093] 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 rectangular parallelepiped, a pentagonal body, a hexagonal body, etc. For example, Figure 3 and Figure 4 As shown, the first box body 21 is a rectangular parallelepiped.

[0094] The first side wall 212 refers to a wall portion of the first box body 21 disposed opposite to the battery cell group 10 in the first direction Y.

[0095] In the case where the first box body 21 is a rectangular parallelepiped, the first direction Y may be the length direction of the first box body 21, or the first direction Y may be the width direction of the first box body 21. If the first direction Y is the length direction of the first box body 21, the first side wall 212 is a side wall extending along the width direction of the first box body 21; if the first direction Y is the width direction of the first box body 21, the first side wall 212 is a side wall extending along the length direction of the first box body 21. For example, Figure 3 and Figure 4 As mentioned above, the first direction Y is the width direction of the first box body 21 . At this time, the first side wall 212 is a side wall extending along the length direction of the first box body 21 .

[0096] It can be understood that the first side wall 212 can be a side wall of the first box body 21 in any direction.

[0097] The first side wall 212 and the bottom wall 211 are connected via a first connection portion 214 , that is, a first connection portion 214 is formed between the first side wall 212 and the bottom wall 211 .

[0098] 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 in one piece. Among them, the first connecting portion 214 can be in various forms, as long as it can meet the connection requirements of 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 marks, colloids, bolts, etc. In the case where the first side wall 212, the first connecting portion 214 and the bottom wall 211 are formed in one piece, the first connecting portion 214 can be a corner between the first side wall 212 and the bottom wall 211 (such as Figure 6 shown).

[0099] The first side wall 212 has a first side surface 21211 facing the battery cell group 10. Correspondingly, the battery cell group 10 also has a surface facing the first side wall 212. The position of the surface of the battery cell group 10 facing the first side wall 212 is defined as the reference line P. Along the first direction Y, the distance from the first side surface 21211 to the reference line P is L. a , measure the distance from the first side surface 21211 to the reference line P as L b .

[0100] The minimum distance between the first side surface 21211 and the battery cell group 10 is L1, that is, L a The minimum value is L1.

[0101] The minimum distance between the first connection portion 214 and the battery cell group 10 is L2, that is, L b The minimum value is L2.

[0102] For example, as shown in Figure 5, from top to bottom, the distance between the first side surface 21211 and the battery cell group 10 is equal, L a is a constant value, at which point L1 is equal to L a .exist Figure 5 In the embodiment, the first connection portion 214 is on a side of the first side surface 21211 away from the battery cell group 10 , and thus L2 is greater than L1 .

[0103] For example, refer to Figure 6 and Figure 7 , 7 is a cross-sectional view of a battery 100 according to some other embodiments of the present application; Figure 7 for Figure 6 The enlarged view of the middle B. Figure 7 As shown, from top to bottom, the distance between the first side surface 21211 and the battery cell group 10 is equal, L a is a constant value, L1 is equal to L a From top to bottom, the distance between the first connection portion 214 and the battery cell group 10 gradually increases. bThe 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 .

[0104] For example, refer to Figure 8 , Figure 8 for Figure 7 Schematic diagram of the structure of other embodiments of the first side wall 212. Figure 8 In the embodiment, the first side surface 21211 is tilted relative to the battery cell group 10, and the distance between the first side surface 21211 and the battery cell group 10 gradually decreases from top to bottom. a From top to bottom, the distance between the first connection portion 214 and the battery cell group 10 gradually increases. The minimum distance L2 between the first connection 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.

[0105] 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.

[0106] In this embodiment, the minimum distance L2 between the first connection 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, so that the distance between the first connection portion 214 and the battery cell group 10 becomes larger, so that the first connection portion 214 is 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 a reliable electrical distance, the minimum distance between the first connection 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 connection portion 214 and the battery cell group 10, reducing the risk of short circuit between the first box body 21 and the battery cell group 10, and improving the reliability of the battery 100.

[0107] In some embodiments, 4 mm ≤ L1 ≤ 50 mm.

[0108] For example, L1 may 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.

[0109] It should be noted that the space inside the first box 21 includes two parts, one part is the space that can accommodate the battery cell group 10, and the other part is the space between the side wall of the first box 21 and the battery cell group 10, which is used for insulation between the battery cell group 10 and the side wall. The larger L1 is, the better the insulation effect between the battery cell group 10 and the side wall is. When the size of the first box 21 is constant, the smaller L1 is, the larger the space that can accommodate the battery cell group 10 is, and the closer the distance between the battery cell group 10 and the side wall is.

[0110] 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, so that a larger space can be provided to accommodate the battery cell group 10, thereby accommodating a larger battery cell group 10, thereby 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, which can take into account both the reliability and energy density of the battery 100.

[0111] In some embodiments, 6 mm ≤ L1 ≤ 40 mm.

[0112] For example, L1 may 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 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.

[0113] In this embodiment, L1 is greater than or equal to 6mm, 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 40mm, 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, 6mm≤L1≤40mm can further take into account both the reliability and energy density of the battery 100.

[0114] Reference Figure 5 and Figure 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 .

[0115] For example, in Figure 5 and Figure 7 In the figure, 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.

[0116] In this embodiment, the first side surface 21211 is perpendicular to the first surface 2111 , which is beneficial to improve the consistency of the distance between the first side surface 21211 and the battery cell group 10 .

[0117] In some embodiments, reference Figure 4 and Figure 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.

[0118] 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 by colloid, the colloid is the first connecting portion 214; if the first side wall 212 and the bottom wall 211 are welded, 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 connected by bolts, the bolts are the first connecting portion 214.

[0119] 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 limited by the molding process of the first box body 21, thereby facilitating the first connecting portion 214 to be set to a position away from the battery cell group 10 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.

[0120] 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.

[0121] 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 welding mark formed by welding between the first side wall 212 and the bottom wall 211 .

[0122] 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 .

[0123] Reference Fig. 9 , Fig. 9 Schematic diagram of the structure of the first beam 212a in some embodiments of the present application. In some embodiments, the first side wall 212 is a first beam 212a formed by roll-forming a plate.

[0124] 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 .

[0125] 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.

[0126] The first side wall 212 is a first beam 212a formed by rolling a plate, which can obtain a first side wall 212 with higher structural strength, further improve the overall structural strength of the first box 21, and improve the reliability of the battery 100. At the same time, it is conducive to the processing and forming of the first side wall 212, and reduces the difficulty of preparing the first side wall 212.

[0127] Reference Figure 5 and Fig. 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 which are 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 are enclosed to form a cavity; wherein the first wall portion 2121 and the third wall portion 2124 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.

[0128] For example, Fig. 9 and Figure 5 As shown, the first wall 2121 , the second wall 2122 , the third wall 2123 and the fourth wall 2124 are enclosed to form a square shape. The first wall is close to the battery cell group 10 , and the fourth wall is close to the bottom wall 211 . The fourth wall is connected to the bottom wall 211 through the first connecting portion 214 .

[0129] 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.

[0130] Reference Fig. 9 and Fig.10 , Fig.10 Schematic diagram of the structure of the first beam 212a in some other embodiments of the present application. In some embodiments, the head and tail ends of the plate are connected.

[0131] 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.

[0132] 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 .

[0133] Reference Fig.10 In some embodiments, the head and tail ends of the plate are welded to form a second welding portion 2126 .

[0134] 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, and a weld mark is formed at the joint 2125, which is the second welding portion 2126. The head end and the tail end of the plate can be melted to fill the joint 2125 to form the second welding portion 2126 to achieve welding of the head and tail ends of the plate, or the joint 2125 can be filled with solder to form the second welding portion 2126 to achieve welding of the head and tail ends of the plate.

[0135] In the case where 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 in sequence end to end, the joints 2125 at the end and end of the plate may be formed at any wall portion of the first beam 212a. Fig. 9 and Fig.10 As shown, the joints 2125 formed at the head and tail ends of the plate are located on the third wall portion 2123 , and correspondingly, the second welding portion 2126 is also located on the third wall portion 2123 .

[0136] 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 .

[0137] In some embodiments, the material of the first beam 212a is steel.

[0138] In some embodiments, the material of the bottom wall 211 is aluminum.

[0139] Reference Figure 2 In some embodiments, the first beam 212 a is provided with a mounting portion 2127 .

[0140] The mounting portion 2127 is a structure for mounting or fixing the battery 100 to a desired position. 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 position.

[0141] The mounting portion 2127 may have various structural forms, including but not limited to mounting holes, sleeves, corner pieces, handles, etc. For example, Figure 2 As shown, the mounting portion 2127 is a handle.

[0142] 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 in sequence, the mounting portion 2127 is disposed on the second wall portion 2122 .

[0143] Reference Fig.11 , Fig.11 The first side 21211 of some embodiments of the present application is provided with an insulating member 24. In some embodiments, the battery 100 further includes an insulating member 24, which is provided on the first side 21211 to further reduce the risk of short circuit between the battery cell group 10 and the first side wall 212, and improve the reliability of the battery 100.

[0144] Reference Fig.12 , Fig.12 for Figure 5 Schematic diagram of the structure of other embodiments of the first beam 212a and the bottom wall 211. 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, and the recessed portion 21241 and the raised portion 2112 abut against each other along the first direction Y. The raised portion 2112 is used to cooperate with the recessed portion 21241 to limit the first beam 212a from moving in the direction close to the battery cell group 10.

[0145] 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.

[0146] Reference Figure 2 , Figure 3 and Figure 4 In some embodiments, the battery 100 further includes a second box body 22 , which together with the first box body 21 defines a storage space for accommodating the battery cell group 10 , and the second box body 22 is connected to the first beam 212 a .

[0147] Optionally, the second box body 22 and the first beam 212a are detachably connected via a locking member 23, and the locking member 23 includes but is not limited to a bolt, a screw, etc. The second box body 22 and the first beam 212a may also be detachably connected via a buckle.

[0148] 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. Figure 3 As shown, the first box body 21 and the second box body 22 are both constructed as rectangular parallelepipeds.

[0149] 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.

[0150] In some implementations, the second box 22 is made of an insulating material to reduce the risk of short circuit between the battery cell group 10 and the second box 22. Optionally, the second box 22 is made of plastic.

[0151] Fig.13 1 is a cross-sectional view of a battery 100 according to some other embodiments of the present application taken from another viewing angle. Fig.14 for Fig.13 Enlarged view of part C in the middle.

[0152] Reference Figure 3 , Fig.13 and Fig.14 In some embodiments, the first box body 21 further includes two second side walls 213 arranged opposite to each other along the third direction X, the battery cell group 10 is located between the two second side walls 213, and each second side wall 213 is connected to the bottom wall 211 through 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, the minimum distance between the second connecting portion 215 and the battery cell group 10 is L4, L3≤L4 is satisfied, and the third direction X is perpendicular to the first direction Y.

[0153] 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.

[0154] In the case where 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. Exemplarily, 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.

[0155] The second side wall 213 and the bottom wall 211 are connected via a second connection portion 215 , that is, a second connection portion 215 is formed between the second side wall 213 and the bottom wall 211 .

[0156] 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 in one piece. Among them, the second connecting portion 215 can be in various forms, as long as it can meet the connection between 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 in one piece, 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).

[0157] The second side wall 213 has a first side surface 21211 facing the battery cell group 10. Correspondingly, the battery cell group 10 also has a surface facing the second side wall 213. The position reference of the surface of the battery cell group 10 facing the second side wall 213 is defined as the reference line F. The minimum distance from the first side surface 21211 to the reference line F is L3, and the distance from the first side surface 21211 to the reference line F is L4.

[0158] In this embodiment, the minimum distance between the second connection 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 connection 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 a reliable electrical distance, the minimum distance between the second connection 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 connection 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.

[0159] In some embodiments, the second side wall 213 is a second beam 213 a formed by roll-forming a plate.

[0160] 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 .

[0161] 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.

[0162] In this embodiment, the second side wall 213 is a second beam 213a formed by rolling a plate, which can obtain a second side wall 213 with higher structural strength, further improve the overall structural strength of the first box body 21, and improve the reliability of the battery 100. At the same time, it is conducive to the processing and forming of the second side wall 213, and reduces the difficulty of preparing the second side wall 213.

[0163] 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.

[0164] In some embodiments, the second beam 213a may have the same structure as the first beam 212a, and the second connection portion 215 may have the same structure as the first connection portion 214. For the sake of brevity, the specific structures of the second beam 213a and the second connection portion 215 are not repeated in this application.

[0165] An embodiment of the present application further provides an electric device, the electric device comprising the battery 100 provided in any of the above embodiments, and the battery 100 is used to supply power to the electric device.

[0166] 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 storing the battery cell group 10 .

[0167] The first box body 21 includes a bottom wall 211 and two first side walls 212 arranged oppositely along a first direction Y and two second side walls 213 arranged oppositely 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 carry the battery cell group 10. Each first side wall 212 is connected to the bottom wall 211 through a first connecting portion 214, and each second side wall 213 is connected to the bottom wall 211 through 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 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 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 side wall 212 is a first beam 212a formed by roll forming of a plate, and the second side wall 213 is a second beam 213a formed by roll forming of a plate. The first beam 212a is welded to the bottom wall 211 to form a first welding portion, and the second beam 213a is welded to the bottom wall 211 to form a second welding portion 2126. The first welding portion is the first connection portion 214, and the second welding 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 in sequence from head to tail. 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 are arranged opposite to each other along the first direction Y, the second wall portion 2122 and the fourth wall portion 2124 are arranged opposite to each other along the second direction Z, the side of the first wall portion 2121 facing the battery cell group 10 is the first side surface 21211, and the second direction Z is perpendicular to the first direction Y. The head and tail ends of the plate are connected and welded to form a second welding portion 2126, and 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.

[0168] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0169] The above embodiments are only used to illustrate the technical solution of the present application and are not used to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery, characterized in that: include: Battery cell group; A first box body, comprising a bottom wall and two first side walls arranged opposite to each other along a first direction, the battery monomer group is located between the two first side walls, the bottom wall is used to carry the battery monomer group, and each of the first side walls and the bottom wall are connected by a first connecting portion; The first side wall has a first side surface facing the battery cell group, and along the first direction, a minimum distance between the first side surface and the battery cell group is L1, and a 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 claim 1, 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, characterized in that The first side wall is a first beam formed by roll forming of a plate member.

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

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

11. The battery according to claim 7, characterized in that The first beam is provided with a mounting portion.

12. The battery according to claim 7, characterized in that The battery also includes: The second box body, together with the first box body, defines a storage space for storing 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 4, 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 of the second side walls 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, 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.

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 member.

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

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