Battery and electric device

Abstract

The utility model discloses a battery and an electric device. The battery comprises a box body. The box body is used for providing an accommodating space for accommodating a battery monomer, the box body is provided with a first wall, and a first weight reduction cavity is formed in the first wall; a first groove is formed in the outer side face of the first wall, the first groove is used for containing a component, and the first groove is not communicated with the first weight reduction cavity. According to the technical scheme, the reliability of the battery can be 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] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

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

[0004] The present application provides a battery and an electrical device, and the technical solution provided in the present application can improve the reliability of the battery.

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

[0006] In a first aspect, the present application provides a battery, the battery comprising a box. The box is used to provide a storage space for accommodating a battery cell, the box has a first wall, and a first weight reduction cavity is formed inside the first wall. A first groove is formed on the outer side of the first wall, the first groove is used to accommodate components, and the first groove is not connected to the first weight reduction cavity.

[0007] In the above scheme, by setting the first groove and the first weight reduction cavity to be unconnected, the risk of external liquid entering the first weight reduction cavity, causing water accumulation inside the first wall, resulting in corrosion of the first wall and failure of the box to protect the battery cell can be reduced, so that the battery has higher reliability.

[0008] According to some embodiments of the present application, the thickness direction of the first wall is defined as the first direction, the box body has two second walls arranged opposite to each other in the second direction, the second walls are connected to the first wall, and the first direction and the second direction are perpendicular to each other. Along the second direction, the first wall has two first end faces opposite to each other, and the first weight reduction cavity passes through the first end face and forms a first opening.

[0009] In the above scheme, by setting the first weight-reducing cavity as the first end face that passes through the first wall, on the one hand, the processing difficulty of the first weight-reducing cavity can be reduced, and on the other hand, at least part of the first opening can be blocked by the second wall, which can reduce the risk of external liquid entering the first weight-reducing cavity, thereby reducing the risk of corrosion of the first wall and the risk of failure of the protection of the battery cell by the box, so that the battery has higher reliability.

[0010] According to some embodiments of the present application, along the third direction, the minimum distance between the first groove and the first weight reduction cavity is L, satisfying that L≥2.5 mm, and the first direction, the second direction and the third direction are perpendicular to each other.

[0011] In the above scheme, by setting the first groove to be at least 2.5 mm away from the first weight reduction cavity in the third direction, the risk of the first groove and the first weight reduction cavity being connected to each other during the processing of the first groove or the first weight reduction cavity can be reduced, thereby reducing the risk of external liquid entering the first wall, causing water accumulation inside the first wall and causing corrosion of the first wall, and the risk of the box body failing to protect the battery cell, so that the battery has higher reliability.

[0012] According to some embodiments of the present application, the first opening is closed by the second wall.

[0013] In the above solution, by setting the first weight-reducing cavity to be enclosed by the second wall, the risk of external liquid entering the interior of the first wall and causing the first wall to be corroded can be reduced, thereby improving the reliability of the battery.

[0014] According to some embodiments of the present application, the second wall is connected to an outer surface of the first wall in the first direction.

[0015] In the above scheme, by connecting the outer surface of the first wall to the second box body, the sealing interface between the first wall and the second wall is located on the outside of the box body. On the one hand, the difficulty of manufacturing and processing the box body can be reduced and the manufacturing efficiency of the battery can be improved; on the other hand, the risk of external liquid entering the interior of the first wall and the interior of the box body can be effectively reduced, so that the battery has higher reliability.

[0016] According to some embodiments of the present application, the second wall is sealingly welded to an outer surface of the first wall in the first direction.

[0017] In the above scheme, the second wall is connected to the outer surface of the first wall in the first direction by sealed welding, which can ensure good sealing between the first wall and the second wall, effectively reduce the risk of external liquid entering the interior of the first wall and the interior of the box, and make the battery have higher reliability.

[0018] According to some embodiments of the present application, the first end face is provided with a convex portion, the second wall includes a first surface corresponding to the first end face, the first surface is provided with a concave portion corresponding to the convex portion, the convex portion is arranged in the concave portion, and the first end face is connected to the first surface.

[0019] In the above scheme, by providing the convex portion and the concave portion, on the one hand, it can facilitate the assembly positioning of the first wall and the second wall and improve the assembly efficiency of the first wall and the second wall; on the other hand, it can increase the connection area and the sealing area between the first wall and the second wall, thereby improving the connection stability and sealing of the first wall and the second wall, thereby making the battery have higher reliability.

[0020] According to some embodiments of the present application, along the third direction, the first wall has a second surface and a third surface opposite to each other. The convex portion includes a first convex portion and a second convex portion, the first convex portion and the second convex portion are arranged at intervals along the third direction, the surface of the first convex portion facing away from the second convex portion is flush with the second surface, and the surface of the second convex portion facing away from the first convex portion is flush with the third surface; the first direction, the second direction and the third direction are perpendicular to each other.

[0021] In the above scheme, by providing the first convex portion and the second convex portion spaced apart from each other along the third direction, on the one hand, it is beneficial to the assembly positioning of the first wall and the second wall, and the assembly efficiency of the first wall and the second wall is effectively improved; on the other hand, it can effectively improve the connection area and the sealing area between the first wall and the second wall, thereby effectively improving the connection stability and sealing of the first wall and the second wall; on the other hand, because the convex portion is flush with the surface of the first wall in the third direction, the concave portion corresponding to the convex portion can be provided at the end of the second wall in the third direction, thereby reducing the influence of the structural strength of the second wall due to the provision of the concave portion, so that the structure of the box is stable and the reliability is high, thereby making the reliability of the battery high.

[0022] According to some embodiments of the present application, the box body further includes a first connecting member, which connects the first protrusion and the second wall in a third direction.

[0023] In the above scheme, by providing the first connecting member, the first protrusion can be firmly connected to the second wall, which can improve the connection stability between the first wall and the second wall and reduce the risk of the first wall and the second wall separating from each other, thereby stabilizing the box structure and further improving the reliability of the battery.

[0024] According to some embodiments of the present application, a second weight-reducing cavity is formed inside the second wall.

[0025] In the above solution, by providing the second weight-reducing cavity inside the second wall, the mass of the battery can be effectively reduced and the weight energy density of the battery can be improved.

[0026] According to some embodiments of the present application, along the first direction, the second wall has a second end surface, and the second weight reduction cavity penetrates the second end surface and forms a second opening on the second end surface.

[0027] In the above scheme, by setting the second weight-reducing groove to pass through the second end face, on the one hand, the second weight-reducing cavity can be formed by processing from the second end face to the inside of the second wall, so that the processing difficulty of the second weight-reducing cavity is low, which is beneficial to the improvement of the manufacturing efficiency of the box body; on the other hand, the first direction can be parallel to the horizontal plane. For this reason, by setting the opening of the second weight-reducing cavity on the second end face, the risk of external liquid entering the second weight-reducing cavity under the action of gravity can be reduced.

[0028] According to some embodiments of the present application, the box body further has a first closing piece, which is connected to the second end surface and closes the second opening.

[0029] In the above solution, by providing the first sealing member, the opening of the second weight-reducing cavity can be effectively sealed, reducing the risk of external liquid entering the second weight-reducing cavity and causing the second wall to be corroded, so that the battery has higher reliability.

[0030] According to some embodiments of the present application, a mounting hole is formed on the second wall, and the mounting hole passes through the surface of the second wall in the third direction. The mounting hole is used for a mounting component to pass through so as to mount the battery on a mounting portion of an electrical device. The third direction, the second direction and the first direction are perpendicular to each other.

[0031] In the above scheme, by setting a mounting hole on the second wall to set a mounting member, the battery can be mounted on the mounting part of the electrical device through the mounting member, thereby facilitating rapid replacement of the battery and allowing the electrical device to have a higher energy replenishment efficiency.

[0032] According to some embodiments of the present application, the mounting hole passes through the outer side of the second wall and forms a third opening, and the box body further has a second closing piece, which is connected to the second wall and closes the third opening.

[0033] In the above solution, by setting the mounting hole to penetrate the outer side of the second wall, the mounting hole can be formed by processing the outer side of the second wall, reducing the difficulty of processing the mounting hole, which is conducive to improving the efficiency of box manufacturing. At the same time, by setting the second sealing member to close the third opening, the risk of external liquid entering the mounting hole and causing liquid accumulation inside the second wall and causing the second wall to be corroded can be reduced, so that the battery has higher reliability.

[0034] In a second aspect, the present application provides an electrical device, comprising the battery provided in the first aspect, and the battery is used to provide electrical energy.

[0035] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] 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.

[0037] Figure 1 A schematic diagram of a vehicle according to some embodiments of the present application;

[0038] Figure 2 A schematic diagram of a battery in some embodiments of the present application;

[0039] Figure 3 Schematic diagram of the first wall and the second wall in some embodiments of the present application;

[0040] Figure 4 This is a schematic diagram of the internal structure of the first wall in some embodiments of the present application;

[0041] Figure 5 for Figure 3 The enlarged view of point A in the middle;

[0042] Figure 6 for Figure 2 Enlarged view of point B in the middle.

[0043] Icon: 100-battery; 10-box; 11-first box; 12-second box; 120-avoidance groove; 13-first wall; 130-first weight reduction cavity; 1300-first opening; 131-first groove; 132-first end surface; 133-convex portion; 1330-first convex portion; 1331-second convex portion; 134-second surface; 135-third surface; 14-second wall; 140-first surface; 141- Recess; 142-second weight-reducing cavity; 1420-second opening; 143-second end face; 144-mounting hole; 1440-third opening; 15-first connecting member; 16-first closing member; 17-second closing member; 18-mounting member; 180-rod body; 181-hanging portion; x-first direction; y-second direction; z-third direction; 1000-vehicle; 200-controller; 300-motor; 400-components. DETAILED DESCRIPTION

[0044] The following detailed description and drawings of the embodiments of the present application are used to illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein 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 figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0046] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0047] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations 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. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0048] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0049] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0050] In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "length", "width", "thickness", "up", "down", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0051] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0052] 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 one or more battery cells. The battery cell includes an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. 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, and the positive electrode collector not coated with the positive electrode active material layer serves as a positive electrode ear. Taking lithium-ion batteries as an example, the material of the positive electrode collector may be aluminum, and the positive electrode active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer. The negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode ear. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. The material of the diaphragm can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene), etc.

[0053] The battery also includes a box body, which provides a storage space for the battery cells. Exemplarily, the box body includes an upper cover and a lower box body, and the upper cover closes the opening of the lower box body to define the storage space together with the lower box body. The battery cells are inside the box body to prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells. In some embodiments, the wall of the box body may be provided with battery components. The components include but are not limited to coolant connectors for realizing battery thermal management, high and low pressure connectors for realizing battery management, pressure relief mechanisms for realizing pressure relief, and the like.

[0054] The electrical device mentioned in the embodiments of the present application can be used in, but not limited to, vehicles, ships, or aircraft, and the battery can provide electrical energy to the electrical device to enable the electrical device to work. In some embodiments, the electrical device includes a device body, the device body has a bracket, and the battery is assembled to the device body through the bracket. In some embodiments, the connection relationship between the battery and the bracket includes, but is not limited to, welding, clamping, screw connection, or mounting connection.

[0055] In recent years, electric vehicles have developed by leaps and bounds. In the field of electric vehicles, batteries, as the power source of electric vehicles, play an irreplaceable and important role. As the core component of electric vehicles, batteries have high requirements in terms of energy density and reliability.

[0056] At present, the energy density of the battery is often improved by reducing the weight of the battery or improving the space utilization of the battery. In some embodiments, by providing a weight-reducing cavity inside the wall of the box, the weight of the battery can be reduced and the weight energy density of the battery can be improved. In other embodiments, by providing grooves on the outer side of the box, the components are embedded in the grooves, which reduces the additional space occupied by the components, improves the space utilization of the battery, and thus improves the volume energy density of the battery. However, if the wall of the box is provided with a weight-reducing cavity and a groove for embedded components at the same time, there will be a problem of mutual communication between the weight-reducing cavity and the groove, resulting in water accumulation inside the wall, causing the box to be corroded, which can easily cause the box seal to fail, and external liquids or other foreign matter will affect the battery cells, resulting in low reliability of the battery.

[0057] In view of this, under the condition of improving the energy density of the battery, in order to improve the problem of water accumulation inside the wall of the box body and affecting the reliability of the battery, some embodiments of the present application provide a battery, the battery includes a box body. The box body has a first wall, and a first weight reduction cavity is formed inside the first wall. A first groove is formed on the outer side of the first wall, and the first groove is used to accommodate components, and the first groove is not connected to the first weight reduction cavity.

[0058] In the above scheme, by providing the first weight-reducing cavity in the first wall and implementing the first groove for embedding components, the weight of the battery can be effectively reduced, and the waste of space by components can be reduced, so that the battery has a higher weight energy density and volume energy density. At the same time, by arranging the first groove and the first weight-reducing cavity to be disconnected from each other, the risk of external liquid entering the first weight-reducing cavity, causing water accumulation inside the first wall, causing the first wall to be corroded, and the risk of the box body failing to protect the battery cell can be reduced, so that the battery has a higher reliability.

[0059] The battery disclosed in the embodiments of the present application can be used in, but not limited to, vehicles, and can also be used in other electrical devices.

[0060] The battery disclosed in the embodiments of the present application can be used in, but is not limited to, vehicles, ships, or aircraft.

[0061] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric car, a ship, a heavy truck, a bus, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0062] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0063] Please refer to Figure 1 , Figure 1 Schematic diagram of a vehicle of some embodiments of the present application. Vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. The type of vehicle 1000 may be a sedan, an off-road vehicle, a heavy truck or a bus, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, the head or the 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, for the circuit system of the vehicle 1000, for example, for the working power requirements during the startup, navigation and operation of the vehicle 1000.

[0064] The vehicle 1000 may further include a controller 200 and a motor 300 , wherein the controller 200 is used to control the battery 100 to supply power to the motor 300 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1000 .

[0065] 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.

[0066] Some embodiments of the present application provide a battery. Figure 2-Figure 5 . Figure 2 This is a schematic diagram of a battery in some embodiments of the present application. Figure 3 This is a schematic diagram of the first wall and the second wall in some embodiments of the present application. Figure 4 This is a schematic diagram of the internal structure of the first wall in some embodiments of the present application. Figure 5 for Figure 3 Enlarged view of point A in the middle.

[0067] The battery 100 includes a box body 10. The box body 10 is used to provide a storage space for accommodating a battery cell. The box body 10 has a first wall 13, and a first weight reduction cavity 130 is formed inside the first wall 13. A first groove 131 is formed on the outer side of the first wall 13, and the first groove 131 is used to accommodate components. The first groove 131 is not connected to the first weight reduction cavity 130.

[0068] The interior of the box 10 has a storage space for accommodating battery cells. In some embodiments, the box 10 may include a first box 11 and a second box 12, which are connected to each other to jointly define a storage space for accommodating battery cells. Optionally, the first box 11 and the second box 12 may be hollow structures with one side open, and the open side of the first box 11 and the open side of the second box 12 cooperate with each other so that the first box 11 and the second box 12 jointly define a closed space; alternatively, the first box 11 may be a hollow structure with one end open, the second box 12 may be a plate-like structure, and the second box 12 is arranged on the open side of the first box 11, so that the first box 11 and the second box 12 jointly define a closed space. Optionally, the second box 12 may be a hollow structure with one end open, the first box 11 may be a plate-like structure, and the first box 11 is arranged on the open side of the second box 12, so that the first box 11 and the second box 12 jointly define a storage space. Optionally, the number of battery cells disposed in the accommodation space may be one or more.

[0069] Exemplarily, the battery 100 is provided with a plurality of battery cells, and the plurality of battery cells can be connected in series, in parallel, or in a hybrid connection. A hybrid connection means that the plurality of battery cells are both connected in series and in parallel. The plurality of battery cells can be directly connected in series, in parallel, or in a hybrid connection, and then the whole formed by the plurality of battery cells is accommodated in the accommodation space; of course, the battery 100 can also be a battery module formed by first connecting a plurality of battery cells in series, in parallel, or in a hybrid connection, and then the plurality of battery modules are connected in series, in parallel, or in a hybrid connection to form a whole, and then accommodated in the accommodation space.

[0070] In some embodiments, the connection relationship between the first box body 11 and the second box body 12 includes but is not limited to welding, bonding, clamping, connection with a connecting member, etc. Exemplarily, the first box body 11 and the second box body 12 are connected by screws.

[0071] In some embodiments, the first box body 11 may be a lower box body, and the second box body 12 may be an upper cover. The vehicle frame includes two longitudinal beams, and the second box body 12 is formed with an avoidance groove 120, which can avoid the longitudinal beams of the vehicle, so that the battery cells in the box body 10 can use the space on the side of the longitudinal beams, so that the space utilization rate of the battery 100 is improved.

[0072] In some embodiments, the structural strength of the material of the first box body 11 may be greater than the structural strength of the second box body 12. In some embodiments, the density of the material of the first box body 11 may be greater than the density of the second box body 12. Exemplarily, the material of the first box body 11 includes but is not limited to aluminum alloy or stainless steel.

[0073] In some embodiments of the present application, the first wall 13 is a wall of the box 10. In some embodiments, the first wall 13 may be a wall of the first box 11. For example, the first box 11 is square, and the first box 11 includes four walls and a bottom wall. The four walls are connected end to end and are arranged around the edge of the bottom wall. The first wall 13 may be one of the four walls. In other embodiments, the first wall 13 may be a wall of the second box 12.

[0074] “A first weight-reducing cavity 130 is formed inside the first wall 13 ” can be understood as, in order to reduce the mass of the first wall 13 , the first wall 13 has a cavity inside, and the cavity includes the first weight-reducing cavity 130 .

[0075] Exemplarily, the thickness direction of the first wall 13 is defined as the first direction x, the length direction of the first wall 13 is defined as the second direction y, and the height direction of the first wall 13 is defined as the third direction z, and the first box 11 and the second box 12 are connected to each other in the height direction. In some embodiments, the first weight reduction cavity 130 can extend along the second direction y, and the first weight reduction cavity 130 can penetrate at least one end of the first wall 13 in the second direction y, such as one end, or two opposite ends; in some of these embodiments, the opening of the first weight reduction cavity 130 can be closed by other wall portions of the box 10, or the opening of the first weight reduction cavity 130 can be closed by other components. In other embodiments, the first weight reduction cavity 130 can extend along the third direction z, and the first weight reduction cavity 130 can penetrate at least one end of the first wall 13 in the third direction z, such as one end, or two opposite ends; in some of these embodiments, the opening of the first weight reduction cavity 130 can be closed by other wall portions of the box 10, or the opening of the first weight reduction cavity 130 can be closed by other components.

[0076] The “outer side of the first wall 13” may be understood as the surface of the first wall 13 away from the accommodation space in the thickness direction of the first wall 13. The first groove 131 is recessed in the outer side of the first wall 13 to accommodate components. In some embodiments, in the thickness direction of the first wall 13, the components located in the first groove 131 may not exceed the outer side of the first wall 13.

[0077] The components include but are not limited to a coolant connector for implementing thermal management of the battery 100, a high and low pressure connector for implementing management of the battery 100, a pressure relief mechanism for implementing pressure relief, and the like. Figure 4 and Figure 5 Component 400 is shown in FIG.

[0078] “The first groove 131 is not connected to the first weight reduction cavity 130” can be understood as that the first weight reduction cavity 130 is staggered with the first weight reduction cavity 130, and the two are independent of each other and not connected to each other. For example, in some embodiments, the first weight reduction cavity 130 extends along the second direction y, and along the third direction z, the position of the first groove 131 is different from the position of the first weight reduction cavity 130, or, there are multiple first weight reduction cavities 130, and multiple first weight reduction cavities 130 are arranged at intervals along the third direction z, and each first weight reduction cavity 130 extends along the second direction y, and the first groove 131 is located between two adjacent first weight reduction cavities 130, or the first groove 131 is located on one side of all the first weight reduction cavities 130.

[0079] In the above scheme, by setting the first groove 131 and the first weight reduction chamber 130 to be disconnected from each other, the risk of external liquid entering the first weight reduction chamber 130, causing water accumulation inside the first wall 13, causing the first wall 13 to be corroded, and the risk of the box body 10 failing to protect the battery cell can be reduced, so that the battery 100 has higher reliability.

[0080] According to some embodiments of this application, see Figure 3 The thickness direction of the first wall 13 is defined as the first direction x. The box body 10 has two second walls 14 arranged opposite to each other in the second direction y. The second wall 14 is connected to the first wall 13. The first direction x and the second direction y are perpendicular to each other. Along the second direction y, the first wall 13 has two first end surfaces 132 opposite to each other. The first weight reduction cavity 130 passes through the first end surface 132 and forms a first opening 1300.

[0081] Exemplarily, taking the first box body 11 as an example, the peripheral wall of the first box body 11 has two first walls 13 opposite to each other in the first direction x. The peripheral wall of the first box body 11 has two second walls 14 opposite to each other in the second direction y, and the first wall 13 has two first end faces 132 opposite to each other in the second direction y, one of the first end faces 132 is directly or indirectly connected to one of the second walls 14, and the other first end face 132 is directly or indirectly connected to the other second wall 14. In the use scenario of the battery 100, the second direction y can be parallel to the horizontal plane.

[0082] The first weight reduction cavity 130 extends along the second direction y, and the first weight reduction cavity 130 respectively penetrates the two first end surfaces 132 in the second direction y and forms a first opening 1300 on the first end surfaces 132 .

[0083] In the above scheme, by setting the first weight reduction cavity 130 as the first end face 132 that passes through the first wall 13, on the one hand, the processing difficulty of the first weight reduction cavity 130 can be reduced, and on the other hand, at least part of the first opening 1300 can be blocked by the second wall 14, which can reduce the risk of external liquid entering the first weight reduction cavity 130, thereby reducing the risk of corrosion of the first wall 13 and the risk of failure of protection of the battery cell by the box 10, so that the battery 100 has higher reliability.

[0084] According to some embodiments of the present application, along the third direction z, the minimum distance between the first groove 131 and the first weight reduction cavity 130 is L, satisfying that L≥2.5 mm, and the first direction x, the second direction y and the third direction z are perpendicular to each other.

[0085] In some embodiments, the first weight reduction cavity 130 penetrates the first wall 13 along the second direction y. In order to make the first weight reduction cavity 130 and the first groove 131 not connected to each other, the first groove 131 and the first weight reduction cavity 130 can be spaced apart in the third direction z, and there is a distance between the two. For example, in the use scenario of the battery 100, the first direction x and the second direction y can be parallel to the horizontal plane, and the third direction z can be perpendicular to the horizontal plane.

[0086] In some embodiments, “the minimum distance L between the first groove 131 and the first weight reduction cavity 130 along the third direction z” can be regarded as that in the first direction x, the first groove 131 and the first weight reduction cavity 130 are projected onto the same plane, and the minimum distance between the two projections on the third direction z is L.

[0087] In some embodiments, along the third direction z, the minimum distance L between the first groove 131 and the first weight reduction cavity 130 may be no less than 2.5 mm, and the value of L may be 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, any value between two adjacent values, or a larger value.

[0088] In the above scheme, by setting the first groove 131 to be at least 0.5 mm away from the first weight reduction cavity 13 in the third direction z, the risk of the first groove 131 and the first weight reduction cavity 130 being connected to each other during the processing of the first groove 131 or the first weight reduction cavity 130 can be reduced, thereby reducing the risk of external liquid entering the first wall 13, causing water accumulation inside the first wall 13 and causing the first wall 13 to be corroded, and the risk of the box body 10 failing to protect the battery cell, so that the battery 100 has higher reliability.

[0089] According to some embodiments of this application, please combine Figure 2 and Figure 3 The first opening 1300 is closed by the second wall 14 .

[0090] In some embodiments, along the second direction y, the second wall 14 has a first surface 140 facing the first wall 13 , and the first surface 140 of the second wall 14 is connected to the first end surface 132 and closes the first opening 1300 .

[0091] In the above solution, by setting the first weight reduction cavity 130 to be closed by the second wall 14 , the risk of external liquid entering the interior of the first wall 13 and causing the first wall 13 to be corroded can be reduced, thereby improving the reliability of the battery 100 .

[0092] In other embodiments, the first end surface 132 of the first wall 13 may be provided with a structural member, and the structural member can close the first opening 1300 .

[0093] According to some embodiments of the present application, the second wall 14 is connected to the outer surface of the first wall 13 in the first direction x.

[0094] In some embodiments, please combine Figure 2 , Figure 3 as well as Figure 5 , the outer surface of the first wall 13 in the first direction x can be the outer side of the first wall 13. “The second wall 14 is connected to the outer surface of the first wall 13 in the first direction x” can be understood as that the connection part between the first wall 13 and the second wall 14 can be located outside the box body 10, and can also be understood as that the first wall 13 and the second wall 14 can be connected and sealed from the outside.

[0095] In some embodiments, the connection relationship of the outer surface of the first wall 13 in the first direction x includes, but is not limited to, bonding or welding.

[0096] In some embodiments, the outer surface of the first wall 13 in the first direction x can be flush with the end surface of the second wall 14 in the first direction x, and the first end surface 132 of the first wall 13 abuts against the first surface 140 of the second wall 14. There is a gap between the outer surface of the first wall 13 in the first direction x and the end surface of the second wall 14 in the first direction x, and an adhesive or welding material can be filled in the gap to connect the second wall 14 to the outer surface of the first wall 13 in the first direction x.

[0097] In the above scheme, by connecting the outer surface of the first wall 13 to the second box body 12, the sealing interface between the first wall 13 and the second wall 14 is located on the outside of the box body 10. On the one hand, the difficulty of manufacturing and processing the box body 10 can be reduced, and the manufacturing efficiency of the battery 100 can be improved; on the other hand, the risk of external liquid entering the interior of the first wall 13 and the interior of the box body 10 can be effectively reduced, so that the battery 100 has higher reliability.

[0098] According to some embodiments of the present application, the second wall 14 is seal-welded to an outer surface of the first wall 13 in the first direction x.

[0099] Sealing welding can be a welding technology, which is mainly used to prevent fluid leakage. Sealing welding technology can adopt the resistance welding seam welding process, and carbon dioxide gas shielded welding is mostly used. Sealing welding is easy to operate, has a wide range of applications, low cost, and good welding sealing and quality.

[0100] In the above scheme, the second wall 14 is connected to the outer surface of the first wall 13 in the first direction x by sealed welding, so that the first wall 13 and the second wall 14 have good sealing, effectively reducing the risk of external liquid entering the interior of the first wall 13 and the interior of the box body 10, so that the battery 100 has higher reliability.

[0101] According to some embodiments of this application, see Figure 5 The first end surface 132 is provided with a convex portion 133 , the second wall 14 includes a first surface 140 corresponding to the first end surface 132 , the first surface 140 is provided with a concave portion 141 corresponding to the convex portion 133 , the convex portion 133 is disposed in the concave portion 141 , and the first end surface 132 is connected to the first surface 140 .

[0102] The convex portion 133 is a portion protruding from the first end surface 132 along the second direction y. In some embodiments, the convex portion 133 may be in a square shape, a cylindrical shape, or other shapes.

[0103] The concave portion 141 is a portion sunken in the first surface 140 along the second direction y. The shape of the concave portion 141 may be arranged corresponding to the convex portion 133 so that the concave portion 141 can play a role in positioning the convex portion 133.

[0104] In the above scheme, by providing the protrusion 133 and the recess 141, on the one hand, it can facilitate the assembly positioning of the first wall 13 and the second wall 14 and improve the assembly efficiency of the first wall 13 and the second wall 14; on the other hand, it can increase the connection area and the sealing area between the first wall 13 and the second wall 14, thereby improving the connection stability and sealing of the first wall 13 and the second wall 14, thereby making the battery 100 have higher reliability.

[0105] According to some embodiments of the present application, along the third direction z, the first wall 13 has a second surface 134 and a third surface 135 opposite to each other. The convex portion 133 includes a first convex portion 1330 and a second convex portion 1331, and the first convex portion 1330 and the second convex portion 1331 are arranged at intervals along the third direction z, and the surface of the first convex portion 1330 that is away from the second convex portion 1331 is flush with the second surface 134, and the surface of the second convex portion 1331 that is away from the first convex portion 1330 is flush with the third surface 135. The first direction x, the second direction y, and the third direction z are perpendicular to each other.

[0106] In some embodiments, the number of the convex parts 133 can be multiple, for example, two, the two convex parts 133 are respectively a first convex part 1330 and a second convex part 1331, and correspondingly, the first surface 140 is provided with a concave part 141 corresponding to the first convex part 1330 and a concave part 141 corresponding to the second convex part 1331. Exemplarily, the third direction z can be regarded as a height direction, the second surface 134 can be regarded as the bottom surface of the first wall 13, and the third surface 135 can be regarded as the top surface of the bottom wall. The bottom surface of the first convex part 1330 can be flush with the second surface 134, and the top surface of the second convex part 1331 can be flush with the third surface 135.

[0107] In some embodiments, the outer surface of the first protrusion 1330 and the outer surface of the second protrusion 1331 may be flush with the outer surface of the first wall 13 . In some embodiments, the outer surface of the first wall 13 in the first direction x, the outer surface of the first protrusion 1330, and the outer surface of the second protrusion 1331 can be flush with the end surface of the second wall 14 in the first direction x, the first end surface 132 of the first wall 13 abuts against the first surface 140 of the second wall 14, the first protrusion 1330 and the second protrusion 1331 are arranged in the corresponding recess 141, and there are gaps between the outer surface of the first wall 13 in the first direction x and the end surface of the second wall 14 in the first direction x, between the outer surface of the first protrusion 1330 and the end surface of the second wall 14 in the first direction x, and between the outer surface of the second protrusion 1331 and the end surface of the second wall 14 in the first direction x, and an adhesive or welding material can be filled in the gap so that the second wall 14 is connected to the outer surface of the first wall 13 in the first direction x, the outer surface of the first protrusion 1330, and the outer surface of the second protrusion 1331.

[0108] In the above scheme, by providing the protrusion 133 and the recess 141, on the one hand, it can facilitate the assembly positioning of the first wall 13 and the second wall 14 and improve the assembly efficiency of the first wall 13 and the second wall 14; on the other hand, it can increase the connection area and the sealing area between the first wall 13 and the second wall 14, thereby improving the connection stability and sealing of the first wall 13 and the second wall 14, thereby making the battery 100 have higher reliability.

[0109] According to some embodiments of this application, see Figure 3 and Figure 5 The box body 10 further includes a first connecting member 15 , and the first connecting member 15 connects the first protrusion 1330 and the second wall 14 in the third direction z.

[0110] The first connecting member 15 is a connecting member connecting the first protrusion 1330 and the second wall 14. The first connecting member 15 includes but is not limited to a threaded member, a rivet member or a clamping member. Exemplarily, the second wall 14 has a threaded hole, the opening of which is located in the recess 141 and is arranged toward the first protrusion 1330. The first connecting member 15 may include a bolt, which passes through the first protrusion 1330 and is arranged in the threaded hole.

[0111] In the above scheme, by setting the first connecting member 15, the first protrusion 1330 can be firmly connected to the second wall 14, which can improve the connection stability between the first wall 13 and the second wall 14 and reduce the risk of the first wall 13 and the second wall 14 separating from each other, thereby making the structure of the box body 10 stable and further making the reliability of the battery 100 high.

[0112] According to some embodiments of this application, see Figure 3 and Figure 5 A second weight-reducing cavity 142 is formed inside the second wall 14 .

[0113] “A second weight-reducing cavity 142 is formed inside the second wall 14 ” can be understood as, in order to reduce the mass of the second wall 14 , the second wall 14 has a cavity inside, and the cavity includes the second weight-reducing cavity 142 .

[0114] In some embodiments, the second weight reduction cavity 142 may extend along the first direction x, and the second weight reduction cavity 142 may penetrate at least one end of the second wall 14 in the first direction x, for example, penetrate one end, or two opposite ends; in some embodiments, the opening of the second weight reduction cavity 142 can be closed by other wall portions of the box body 10, or the opening of the second weight reduction cavity 142 can be closed by other components. In other embodiments, the second weight reduction cavity 142 may extend along the third direction z, and the second weight reduction cavity 142 may penetrate at least one end of the second wall 14 in the third direction z, for example, penetrate one end, or two opposite ends; in some embodiments, the opening of the second weight reduction cavity 142 can be closed by other wall portions of the box body 10, or the opening of the second weight reduction cavity 142 can be closed by other components.

[0115] In some embodiments, the second wall 14 has a plurality of second weight-reducing cavities 142 , and the plurality of second weight-reducing cavities 142 may be arranged at intervals.

[0116] In the above solution, by providing the second weight-reducing cavity 142 inside the second wall 14 , the mass of the battery 100 can be effectively reduced and the weight energy density of the battery 100 can be improved.

[0117] According to some embodiments of the present application, along the first direction x, the second wall 14 has a second end surface 143 , and the second weight reduction cavity 142 penetrates the second end surface 143 and forms a second opening 1420 on the second end surface 143 .

[0118] In some embodiments, in the usage scenario of the battery 100 , the first direction x and the second direction y may be parallel to a horizontal plane.

[0119] In some embodiments, the second weight reduction cavity 142 can extend along the first direction x and penetrate at least one end surface of the second wall 14 in the first direction x to form a second opening 1420 .

[0120] In some embodiments, the second weight reduction cavity 142 can extend along the first direction x and penetrate two end surfaces of the second wall 14 opposite to each other in the first direction x to form second openings 1420 respectively.

[0121] In the above scheme, by setting the second weight reduction groove to pass through the second end face 143, on the one hand, the second weight reduction cavity 142 can be formed from the second end face 143 to the inside of the second wall 14, so that the processing difficulty of the second weight reduction cavity 142 is low, which is beneficial to the improvement of the manufacturing efficiency of the box body 10; on the other hand, the first direction x can be parallel to the horizontal plane. For this reason, by setting the opening of the second weight reduction cavity 142 on the second end face 143, the risk of external liquid entering the second weight reduction cavity 142 under the action of gravity can be reduced.

[0122] According to some embodiments of this application, please combine Figure 2 and Figure 5 The box body 10 further includes a first closing member 16 , which is connected to the second end surface 143 and closes the second opening 1420 .

[0123] The first closing member 16 is a structural member for closing the second opening 1420. In some embodiments, the first closing member 16 may be plate-shaped, and the first closing member 16 may cover the second end surface 143 to close the second opening 1420.

[0124] The connection between the first closing member 16 and the second end surface 143 includes, but is not limited to, bonding, welding, screw connection or other connection methods.

[0125] In some embodiments, the second weight reduction cavity 142 can extend along the first direction x and penetrate the two opposite end surfaces of the second wall 14 in the first direction x to form second openings 1420 respectively, and the two opposite end surfaces of the second wall 14 in the first direction x are respectively provided with first closure members 16 .

[0126] In the above scheme, by providing the first sealing member 16, the opening of the second weight-reducing cavity 142 can be effectively sealed, reducing the risk of external liquid entering the second weight-reducing cavity 142 and causing the second wall 14 to be corroded, so that the battery 100 has higher reliability.

[0127] According to some embodiments of the present application, the second wall 14 is formed with a mounting hole 144, which penetrates the surface of the second wall 14 in the third direction z. The mounting hole 144 is used for allowing a mounting component to pass through so as to mount the battery 100 on a mounting portion of an electrical device. The third direction z, the second direction y and the first direction x are perpendicular to each other.

[0128] The mounting hole 144 is a hole-shaped structure provided on the second wall 14. The mounting hole 144 is used to accommodate a portion of the mounting member 18. Another portion of the mounting member 18 can be located outside the mounting hole 144 and mounted on the mounting portion of the electrical device. In some embodiments, the electrical device can be a vehicle, and the mounting portion can be a bracket provided on a frame of the vehicle.

[0129] Exemplarily, the mounting part is a bracket, and the bracket is formed with a locking hole corresponding to the mounting hole 144. The shape of the locking hole is a non-centrally symmetrical figure, and its size in one direction is larger, for example, the locking hole is formed as a rectangle. The mounting member 18 is rotatably arranged in the mounting hole 144. The mounting member 18 includes a rod body 180 and a hanging portion 181. The rod body 180 is rotatably arranged in the mounting hole 144. The hanging portion 181 is protruded from the rod body along the radial direction of the rod body. When the battery 100 is moved upward, the hanging portion 181 passes through the locking hole. By rotating the rod body, the hanging portion is rotated, so that the hanging portion and the locking hole are misaligned so as to be able to overlap the bracket.

[0130] “The mounting hole 144 penetrates the surface of the second wall 14 in the third direction z” may mean that the mounting hole 144 penetrates a surface of the second wall 14 in the third direction z, and the surface corresponds to the mounting portion of the electrical device. Alternatively, it may mean that the mounting hole 144 penetrates two surfaces of the second wall 14 that are opposite to each other in the third direction z.

[0131] In the above scheme, by setting the mounting hole 144 on the second wall 14 to set the mounting part, the battery 100 can be mounted on the mounting part of the electrical device through the mounting part, thereby facilitating the rapid replacement of the battery 100 and making the electrical device have a higher energy replenishment efficiency.

[0132] According to some embodiments of this application, see Figure 6 , Figure 6 for Figure 2 The mounting hole 144 penetrates the outer side of the second wall 14 and forms a third opening 1440 . The box body 10 further has a second closing member 17 , which is connected to the second wall 14 and closes the third opening 1440 .

[0133] In some embodiments, the outer side of the second wall 14 may refer to the surface of the second wall 14 that is away from the interior of the box 10 along the second direction y. The third opening 1440 is formed on the outer side of the second wall 14 so that the mounting hole 144 communicates with the outside.

[0134] In some embodiments, the size of the third opening 1440 in the third direction z may be smaller than the size of the mounting hole 144 in the third direction z. In some embodiments, the mounting component may be placed in the mounting hole 144 through the third opening 1440 .

[0135] The second closing member 17 is a structural member for closing the third opening 1440. In some embodiments, the second closing member 17 may be plate-shaped, and the second closing member 17 closes the third opening 1440. In some embodiments, the outer side surface of the second wall 14 may be provided with a groove corresponding to the edge of the third opening 1440, and the second closing member 17 may be embedded in the groove to close the third opening 1440, and the outer surface of the second closing member 17 is flush with the outer side surface of the second wall 14.

[0136] The connection between the second closing member 17 and the second wall 14 includes, but is not limited to, bonding, welding, screw connection or other connection methods.

[0137] In the above solution, by setting the mounting hole 144 to penetrate the outer side of the second wall 14, the mounting hole 144 can be formed by processing the outer side of the second wall 14, reducing the processing difficulty of the mounting hole 144, which is conducive to improving the manufacturing efficiency of the box 10. At the same time, by setting the second sealing member 17 to close the third opening 1440, the risk of external liquid entering the mounting hole 144 and causing liquid accumulation inside the second wall 14 and causing the second wall 14 to be corroded can be reduced, so that the battery 100 has higher reliability.

[0138] According to some embodiments of the present application, there is provided an electrical device, which includes the battery 100 described above, and the battery 100 is used to provide electrical energy.

[0139] The electrical device may be a vehicle, and a vehicle is used as an example for this description.

[0140] The vehicle may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. The type of the vehicle may be a sedan, an off-road vehicle, a heavy truck or a bus, etc. The vehicle is provided with a battery 100, and the battery 100 may be provided at the bottom of the vehicle. The battery 100 may be used to power the vehicle, for example, the battery 100 may be used as an operating power source for the vehicle, and used for the circuit system of the vehicle, for example, for the working power demand during the starting, navigation and operation of the vehicle.

[0141] The vehicle may also include a controller and a motor, and the controller is used to control the battery 100 to power the motor, for example, for starting, navigating, and driving the vehicle. In some embodiments of the present application, the battery 100 can not only be used as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0142] In some embodiments, the vehicle includes a frame, the frame may include a longitudinal beam, and the longitudinal beam is equipped with a bracket. The battery 100 is connected to the bracket. In some embodiments, the battery 100 and the bracket may be fixedly connected or detachably connected. When the battery 100 is detachably connected to the bracket, the energy replenishment method of the vehicle may include battery replacement, that is, replacing the battery 100.

[0143] According to some embodiments of the present application, a battery 100 is provided. Figure 2-Figure 6 .

[0144] The battery 100 includes a box 10, which includes a first box 11 and a second box 12. The first box 11 and the second box 12 are connected to each other in a third direction z to define a storage space for accommodating a battery cell. The box 10 is square, the first box 11 is the lower box 10, and the second box 12 is the upper cover.

[0145] The first box body 11 has a first wall 13 in the first direction x, and has two second walls 14 arranged opposite to each other in the second direction y. The first wall 13 has two first end surfaces 132 opposite to each other in the second direction y, and the first end surfaces 132 are connected to the second wall 14. The first direction x, the second direction y, and the third direction z are perpendicular to each other.

[0146] A first weight-reducing cavity 130 is formed inside the first wall 13. The first weight-reducing cavity 130 extends along the second direction y, passes through two first end surfaces 132 of the first wall 13 opposite to each other, and respectively forms first openings 1300. The second wall 14 closes the first openings 1300. The second wall 14 is sealed and welded to the outer side surface of the first wall 13.

[0147] A first groove 131 is formed on the outer side of the first wall 13 , and the first groove 131 accommodates components of the battery 100 . The first groove 131 is not connected to the first weight reduction cavity 130 .

[0148] In some embodiments, in the third direction z, the first groove 131 and the first weight reduction cavity 130 are staggered and spaced apart. Along the third direction z, the minimum distance between the first groove 131 and the first weight reduction cavity 130 is L, satisfying L≥2.5 mm.

[0149] In the above scheme, by setting the first groove 131 and the first weight reduction chamber 130 to be disconnected from each other, the risk of external liquid entering the first weight reduction chamber 130, causing water accumulation inside the first wall 13, causing the first wall 13 to be corroded, and the risk of the box body 10 failing to protect the battery cell can be reduced, so that the battery 100 has higher reliability.

[0150] The above description is only the preferred embodiment of the present application and is not intended 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: A box body, used to provide a storage space for accommodating a battery cell, the box body having a first wall, and a first weight-reducing cavity is formed inside the first wall; A first groove is formed on the outer side surface of the first wall. The first groove is used to accommodate components. The first groove is not connected to the first weight-reducing cavity.

2. The battery according to claim 1, characterized in that The thickness direction of the first wall is defined as a first direction, the box body has two second walls opposite to each other in the second direction, the second walls are connected to the first wall, and the first direction and the second direction are perpendicular to each other; Along the second direction, the first wall has two first end surfaces opposite to each other, and the first weight reduction cavity penetrates through the first end surfaces to form a first opening.

3. The battery according to claim 2, characterized in that Along the third direction, the minimum distance between the first groove and the first weight reduction cavity is L, satisfying that L≥2.5 mm, and the first direction, the second direction and the third direction are perpendicular to each other.

4. The battery according to claim 2, characterized in that The first opening is closed by the second wall.

5. The battery according to claim 2, characterized in that The second wall is connected to an outer surface of the first wall in the first direction.

6. The battery according to claim 5, characterized in that The second wall is seal-welded to an outer surface of the first wall in the first direction.

7. The battery according to claim 2, characterized in that The first end surface is provided with a convex portion, the second wall includes a first surface corresponding to the first end surface, the first surface is provided with a concave portion corresponding to the convex portion, the convex portion is arranged in the concave portion, and the first end surface is connected to the first surface.

8. The battery according to claim 7, characterized in that Along the third direction, the first wall has a second surface and a third surface opposite to each other; The convex portion includes a first convex portion and a second convex portion, the first convex portion and the second convex portion are arranged at intervals along the third direction, the surface of the first convex portion facing away from the second convex portion is flush with the second surface, and the surface of the second convex portion facing away from the first convex portion is flush with the third surface; the first direction, the second direction and the third direction are perpendicular to each other.

9. The battery according to claim 8, characterized in that The box body further includes a first connecting member, and the first connecting member connects the first protrusion and the second wall in the third direction.

10. The battery according to claim 2, characterized in that A second weight-reducing cavity is formed inside the second wall.

11. The battery according to claim 10, characterized in that Along the first direction, the second wall has a second end surface, and the second weight reduction cavity penetrates the second end surface and forms a second opening on the second end surface.

12. The battery according to claim 11, characterized in that The box body also has a first closing piece, which is connected to the second end surface and closes the second opening.

13. The battery according to claim 2, characterized in that The second wall is formed with a mounting hole, which passes through the surface of the second wall in the third direction. The mounting hole is used for a mounting member to pass through so as to mount the battery on a mounting portion of an electrical device. The third direction, the second direction and the first direction are perpendicular to each other.

14. The battery according to claim 13, characterized in that The mounting hole passes through the outer side surface of the second wall to form a third opening. The box body also has a second closing piece, and the second closing piece is connected to the second wall and closes the third opening.

15. An electrical device, characterized in that: The battery comprising any one of claims 1 to 14 is used for providing electrical energy.

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