Battery and electric equipment

Abstract

A battery (100) and an electric device, the battery (100) comprises a battery cell group (10), a box cover (20) and a restraining structure (30), the box cover (20) is used for fixedly connecting the battery cell group (10), the box cover (20) is provided with a containing cavity (23), the containing cavity (23) is used for containing at least part of the battery cell group (10), the restraining structure (30) is used for restraining expansion of the battery cell group (10), and the restraining structure (30) is arranged on the box cover (20).

Description

Batteries and electric equipment Technical Field

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

[0002] With the rapid development of new energy technologies, electric vehicles are becoming more and more popular. Electric vehicles are vehicles that rely on the electricity provided by batteries as a power source for all or part of their working conditions.

[0003] Currently, due to the large weight and low mass energy density of batteries, the endurance performance of electric vehicles is reduced, which is not conducive to the promotion and application of electric vehicles. Therefore, how to reduce the weight of batteries is a technical problem that needs to be solved urgently.

[0004] Summary of the Invention

[0005] One of the purposes of the embodiments of the present application is to provide a battery and an electric device, aiming to solve the technical problem of heavy battery weight in related technologies.

[0006] To solve the above technical problems, the technical solutions adopted in the embodiments of the present application are:

[0007] An embodiment of the present application provides a battery, including a cell group, a box cover and a constraint structure. The box cover is used to fix the cell group, the box cover has a cavity, the cavity is used to accommodate at least part of the cell group, and the constraint structure is used to constrain the expansion of the cell group. The constraint structure is arranged on the box cover.

[0008] The battery provided by the embodiment of the present application has at least the following beneficial effects: the battery cell group in the battery provided by the embodiment of the present application is accommodated in the cavity of the box cover and fixedly connected to the box cover, and a constraint structure for constraining the expansion of the battery cell group is arranged on the box cover. Compared with the traditional method of arranging the battery cell group and the constraint structure in the battery frame, at least the height dimension of the frame can be reduced to reduce the weight of the frame, thereby effectively reducing the weight of the battery, improving the mass energy density of the battery, and effectively improving the endurance performance of the electric device.

[0009] In some embodiments of the present application, the restraint structure includes two beam structures spaced apart from each other, and the two beam structures cooperate to clamp the battery cell group.

[0010] By adopting the above technical solution, under the clamping action of the two beam structures, the expansion force of the battery cell group can be resisted, thereby limiting the expansion and deformation of the battery cell group and effectively improving the safety performance of the battery.

[0011] In some embodiments of the present application, the box cover includes a cover plate and an enclosing structure connected to the cover plate, the enclosing structure and the cover plate enclose a cavity, and the beam structure is connected to at least one of the cover plate and the enclosing structure.

[0012] By adopting the above technical solution, the installation operation of the beam structure is facilitated, so that the two beam structures can clamp the battery cell group more effectively.

[0013] In some embodiments of the present application, the beam structure includes a transition piece and a beam body, the transition piece includes a matching portion and an installation portion that are connected to each other, the matching portion is shaped to match and are connected to at least part of the inner wall surface of the surrounding structure, and the beam body is connected to the installation portion.

[0014] By adopting the above technical solution, since the matching part of the adapter can match the shape of at least part of the inner wall surface of the surrounding structure and connect with each other, and the beam body is connected to the mounting part of the adapter, the beam body can be connected to the surrounding structure through the adapter, which facilitates the assembly of the beam body and effectively improves the connection strength between the beam body and the box cover, thereby effectively reducing the risk of deformation or displacement of the beam body and effectively improving the reliability of the battery.

[0015] In some embodiments of the present application, the enclosing structure includes a first wall body and a second wall body arranged opposite to each other, the adapter includes a first adapter and a second adapter, the matching portion of the first adapter is matched with the shape of at least a portion of the inner wall surface of the first wall body and are connected to each other, the matching portion of the second adapter is matched with the shape of at least a portion of the inner wall surface of the second wall body and are connected to each other, one end of the beam body is connected to the mounting portion of the first adapter, and the other end of the beam body is connected to the mounting portion of the second adapter.

[0016] By adopting the above technical solution, the two ends of the beam body can be connected to the surrounding structure through the adapter, further improving the connection strength between the beam body and the box cover, thereby further reducing the risk of deformation or displacement of the beam body.

[0017] In some embodiments of the present application, installation cavities are provided at both ends of the beam body, the installation portion of the first adapter is embedded in one installation cavity, and the installation portion of the second adapter is embedded in the other installation cavity.

[0018] By adopting the above-mentioned technical solution, the mounting portion of the first adapter and the mounting portion of the second adapter can be arranged in the mounting cavity of the beam body, which effectively improves the integration between the mounting portion of the first adapter, the mounting portion of the second adapter and the beam body, and makes the connection structure between the beam body and the first adapter and the connection structure between the beam body and the second adapter more compact, effectively saving the space occupied by the connection structure between the beam body and the first adapter and the connection structure between the beam body and the second adapter, thereby effectively improving the volume energy density of the battery.

[0019] In some embodiments of the present application, the beam body is connected to the cover plate.

[0020] By adopting the above technical solution, the connection strength between the beam body and the box cover is further improved, thereby further reducing the risk of deformation or displacement of the beam body.

[0021] In some embodiments of the present application, the beam body includes a first main body and a first flange, one end of the first main body is connected to the mounting portion of the first adapter, the other end of the first main body is connected to the mounting portion of the second adapter, the first flange is connected to one side of the first main body along the width direction of the beam body, and the first flange is connected to the cover plate.

[0022] By adopting the above technical solution, the connection area between the beam body and the cover plate is effectively increased, and the connection strength between the beam body and the box cover is further improved, thereby further reducing the risk of deformation or displacement of the beam body.

[0023] In some embodiments of the present application, the first flange is connected to the side of the first body facing the battery cell group, the cover plate is provided with a first groove, the first flange is connected to the bottom of the first groove, and the depth of the first groove is greater than or equal to the thickness of the first flange.

[0024] By adopting the above technical solution, the first groove provides the first flange with an escape space for evading the battery cell group, thereby effectively improving the interference between the first flange and the battery cell group.

[0025] In some embodiments of the present application, the beam body further includes a second flange, the second flange is connected to a side of the first body facing away from the battery cell group, and the second flange is connected to the cover plate.

[0026] By adopting the above technical solution, the connection area between the beam body and the cover plate is further increased, and the connection strength between the beam body and the box cover is further improved, thereby further reducing the risk of deformation or displacement of the beam body.

[0027] In some embodiments of the present application, the beam body and the cover plate are welded.

[0028] By adopting the above technical solution, the beam body and the cover plate can be connected without opening additional connection holes on the cover plate, which effectively improves the sealing performance of the battery and effectively simplifies the assembly process of the beam body and the cover plate, thereby effectively improving the assembly efficiency of the battery.

[0029] In some embodiments of the present application, the enclosing structure includes a first wall body and a second wall body arranged opposite to each other, the matching part includes a first matching part and a second matching part, the first matching part is shaped to match with at least a portion of the inner wall surface of the first wall body and are connected to each other, the second matching part is shaped to match with at least a portion of the inner wall surface of the second wall body and are connected to each other, one end of the mounting part is connected to the first matching part, and the other end of the mounting part is connected to the second matching part, and the beam body extends in a direction from the first matching part toward the second matching part.

[0030] By adopting the above technical solution, one end of the mounting portion can be connected to the surrounding structure through the first matching portion, and the other end of the mounting portion can be connected to the surrounding structure through the second matching portion, which effectively improves the connection strength between the mounting portion and the box cover. Since the beam body extends in the direction from the first matching portion toward the second matching portion, after the beam body is connected to the mounting portion, the connection strength between the beam body and the box cover can be improved, thereby further reducing the risk of deformation or displacement of the beam body.

[0031] In some embodiments of the present application, the beam body is provided with an installation cavity, and the installation portion is embedded in the installation cavity.

[0032] By adopting the above technical solution, the mounting part can be set in the mounting cavity of the beam body, which effectively improves the integration between the mounting part and the beam body, makes the connection structure between the beam body and the adapter more compact, and effectively saves the space occupied by the connection structure between the beam body and the adapter, thereby effectively improving the volume energy density of the battery.

[0033] In some embodiments of the present application, the mounting portion is connected to the cover plate.

[0034] By adopting the above technical solution, the connection strength between the adapter and the box cover is effectively improved. After the beam body is connected to the mounting part, the connection strength between the beam body and the box cover can be improved, thereby further reducing the risk of deformation or displacement of the beam body.

[0035] In some embodiments of the present application, the mounting portion includes a second main body and a third flange, the beam body is mounted on the second main body, and the third flange is connected between the second main body and the cover plate.

[0036] By adopting the above technical solution, the connection area between the mounting part and the cover plate is effectively increased, and the connection strength between the adapter and the box cover is further improved. After the beam body is connected to the mounting part, the connection strength between the beam body and the box cover can be improved, thereby further reducing the risk of deformation or displacement of the beam body.

[0037] In some embodiments of the present application, the third flange is connected to the side of the second body facing the battery cell group, the cover plate is provided with a second groove, the third flange is connected to the bottom of the second groove, and the depth of the second groove is greater than or equal to the thickness of the third flange.

[0038] By adopting the above technical solution, the second groove provides the third flange with an escape space for avoiding the battery cell group, thereby effectively improving the interference between the third flange and the battery cell group.

[0039] In some embodiments of the present application, the mounting portion further includes a fourth flange, the fourth flange is connected to a side of the second body facing away from the battery cell group, and the fourth flange is connected to the cover plate.

[0040] By adopting the above technical solution, the connection area between the mounting portion and the cover plate is further increased, and the connection strength between the adapter and the box cover is further improved. After the beam body is connected to the mounting portion, the connection strength between the beam body and the box cover can be improved, thereby further reducing the risk of deformation or displacement of the beam body.

[0041] In some embodiments of the present application, the mounting portion is welded to the cover plate.

[0042] By adopting the above technical solution, the mounting part and the cover plate can be connected without opening additional connection holes on the cover plate, which effectively improves the sealing performance of the battery and effectively simplifies the assembly process of the mounting part and the cover plate, thereby effectively improving the assembly efficiency of the battery.

[0043] In some embodiments of the present application, the beam body has a supporting surface and an abutting surface. The supporting surface is arranged back to back with the battery cell group, and the abutting surface is arranged opposite to the battery cell group and is used to abut the battery cell group to resist the expansion force of the battery cell group.

[0044] By adopting the above technical solution, the expansion force of the battery cell group can be effectively resisted, thereby effectively limiting the expansion and deformation of the battery cell group, and effectively improving the safety performance of the battery.

[0045] In some embodiments of the present application, at least a portion of the support surface is inclined or extends in a stepped manner from the cover plate toward the abutting surface.

[0046] By adopting the above technical solution, the support area of ​​the beam body is effectively increased, the support strength of the beam body is effectively improved, and the beam body can more effectively resist the expansion force of the battery cell group, thereby further reducing the risk of deformation or displacement of the beam body.

[0047] In some embodiments of the present application, the constraint structure further includes a first connecting member connected between two adjacent beam structures.

[0048] By adopting the above technical solution, the relative positions of two adjacent beam structures are effectively restricted, thereby further reducing the risk of deformation or displacement of the beam structures.

[0049] In some embodiments of the present application, the first connecting member is connected to a side of the beam structure away from the cover plate.

[0050] By adopting the above technical solution, the risk of interference between the first connecting member and the battery cell group is effectively reduced, making it easier to connect the first connecting member to the beam structure.

[0051] In some embodiments of the present application, the box cover is used to connect to the external frame.

[0052] By adopting the above technical solution, at least part of the load of the battery cell group can be directly transferred to the external frame through the box cover. In other words, at least part of the load of the battery cell group can be borne by the external frame. This can reduce the strength requirements for other supporting components of the battery and reduce the size of these supporting components. For example, the weight of the battery frame can be reduced, thereby effectively reducing the weight of the battery, improving the mass energy density of the battery, and effectively improving the endurance performance of the electric device.

[0053] In some embodiments of the present application, the battery further includes a mounting assembly, the box cover is connected to the mounting assembly, and the mounting assembly is used to connect to an external frame.

[0054] By adopting the above technical solution, it is convenient to connect the box cover to the external frame.

[0055] In some embodiments of the present application, at least part of the mounting assembly includes a support member and a second connecting member, the support member is connected to the box cover, and the second connecting member is connected to the support member and is used to connect to the external frame.

[0056] By adopting the above technical solution, it is convenient to connect the box cover to the external frame.

[0057] In some embodiments of the present application, the battery cell group is connected to the lower portion of the cover plate, the support member is connected to the cover plate, and the second connecting member connects the support member and the cover plate to the external frame.

[0058] By adopting the above technical solution, the strength of the cover plate is effectively improved, thereby effectively improving the cover plate's bearing capacity for the battery cell group.

[0059] In some embodiments of the present application, the battery further includes a frame and a protective plate, and the box cover, the frame, and the protective plate are connected in sequence along the gravity direction of the battery.

[0060] By adopting the above technical solution, the battery cell group can be effectively protected.

[0061] In some embodiments of the present application, the frame includes a first support beam, the first support beam includes a support beam body and an energy-absorbing beam body, and the energy-absorbing beam body is connected to a side of the support beam body facing away from the battery cell group.

[0062] By adopting the above technical solution, when the outer side of the battery is impacted by external force, the energy-absorbing beam can effectively absorb the impact energy, thereby effectively improving the situation where the impact energy is transmitted to the battery cell group through the frame, and effectively reducing the risk of damage to the battery cell group.

[0063] In some embodiments of the present application, the energy absorbing beam includes a main beam and a first energy absorbing body. The main beam is connected to the side of the supporting beam facing away from the battery cell group and has a first energy absorbing cavity. The first energy absorbing body is arranged in the first energy absorbing cavity.

[0064] By adopting the above technical solution, when the outer side of the battery is impacted by external force, the impact energy can be transmitted to the first energy-absorbing body through the main beam, causing the main beam and the first energy-absorbing body to deform in turn, so that the energy-absorbing beam can absorb the impact energy more effectively, further reducing the risk of damage to the battery cell group.

[0065] In some embodiments of the present application, the protective plate includes a first plate body, a second plate body and a second energy absorbing body. The first plate body and the second plate body are spaced apart along the height direction of the battery to form a second energy absorbing cavity. The second energy absorbing body is arranged in the second energy absorbing cavity.

[0066] By adopting the above technical solution, when the bottom of the battery is impacted by external force, the impact energy can be transferred to the second energy absorber, causing the second energy absorber to deform, so that the protective plate can more effectively absorb the impact energy, further reducing the risk of damage to the battery cell pack.

[0067] In some embodiments of the present application, the battery cell group is bonded to the box cover.

[0068] By adopting the above technical solution, the force between the battery cell group and the box cover can be made more uniform, and the assembly process of the battery cell group and the box cover can be simplified, thereby effectively improving the assembly efficiency of the battery.

[0069] An embodiment of the present application also provides an electric device, comprising the battery described in any of the above embodiments.

[0070] The electric device provided by the embodiments of the present application has at least the following beneficial effects: the electric device provided by the embodiments of the present application effectively improves the reliability of the electric device because it adopts the battery described in any of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or exemplary technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0072] FIG1 is a schematic structural diagram of a vehicle provided in an embodiment of the present application;

[0073] FIG2 is a schematic diagram of an exploded structure of a battery provided in an embodiment of the present application;

[0074] FIG3 is a schematic diagram of the exploded structure of a battery provided by one embodiment of the present application with the cell group, frame and protective plate removed;

[0075] FIG4 is a schematic structural diagram of a box cover in the battery shown in FIG3 ;

[0076] FIG5 is a schematic structural diagram of an adapter in the battery shown in FIG3 ;

[0077] FIG6 is a schematic structural diagram of the beam body in the battery shown in FIG3 ;

[0078] FIG7 is a schematic diagram of the main structure of the beam shown in FIG6 ;

[0079] FIG8 is a schematic structural diagram of the battery shown in FIG3 ;

[0080] FIG9 is a schematic cross-sectional view of the battery shown in FIG8 along line AA;

[0081] FIG10 is an enlarged structural diagram of position B of the battery shown in FIG9 ;

[0082] FIG11 is a schematic diagram of an exploded structure of a battery provided by another embodiment of the present application with the cell group, frame and protective plate removed;

[0083] FIG12 is a schematic structural diagram of a box cover in the battery shown in FIG11 ;

[0084] FIG13 is a schematic structural diagram of the adapter in the battery shown in FIG11 ;

[0085] FIG14 is a schematic structural diagram of the beam body in the battery shown in FIG11 ;

[0086] FIG15 is a schematic diagram of the main structure of the beam shown in FIG14;

[0087] FIG16 is a schematic structural diagram of the battery shown in FIG11 ;

[0088] FIG17 is a schematic cross-sectional view of the battery shown in FIG16 along line CC;

[0089] FIG18 is an enlarged structural diagram of a portion D of the battery shown in FIG17 ;

[0090] FIG19 is a schematic structural diagram of a first support beam of a frame body in the battery shown in FIG2 ;

[0091] FIG20 is a schematic diagram of the front structure of the guard plate in the battery shown in FIG2 ;

[0092] FIG21 is a schematic structural diagram of a battery cell provided in an embodiment of the present application;

[0093] FIG22 is a schematic top view of the battery cell shown in FIG21 ;

[0094] FIG23 is a schematic cross-sectional view of the battery cell shown in FIG22 along line EE.

[0095] Among them, the reference numerals in the figures are:

[0096] 1000. Vehicle;

[0097] 100, battery; 10, battery cell group; 11, battery cell; 111, housing; 112, electrode assembly; 113, electrode terminal; 20, box cover; 21, cover plate; 211, first groove; 212, second groove; 22, surrounding structure; 221, first wall; 222, second wall; 23, cavity; 30, restraining structure; 31, beam structure; 311, adapter; 311a, first adapter; 311b, second adapter; 3111, matching portion; 3111a, first matching portion; 3111b, second matching portion; 3112, mounting portion; 31121, second body; 31122, third flange; 31123, fourth flange; 312, beam body; 3121, mounting cavity; 3122, first main body; 3123, first flange; 3124, second flange; 3125, abutting surface; 3126, supporting surface; 313, first fastener; 32, first connecting member; 33, second fastener; 40, frame; 41, first supporting beam; 411, supporting beam body; 412, energy-absorbing beam body; 4121, main beam body; 4122, first energy-absorbing member; 4123, first energy-absorbing cavity; 42, second supporting beam; 50, guard plate; 51, first plate body; 52, second plate body; 53, second energy-absorbing member; 54, second energy-absorbing cavity; 60, mounting assembly; 61, supporting member; 62, second connecting member;

[0098] 200, frame;

[0099] 300, controller;

[0100] 400, motor;

[0101] 500. Wheel. DETAILED DESCRIPTION

[0102] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0103] It should be noted that when a component is referred to as being "fixed on" or "set on" another component, it can be directly on the other component or indirectly on the other component. When a component is referred to as being "connected to" another component, it can be directly or indirectly connected to the other component. The terms "upper", "lower", "left", "right", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings. They are only for the convenience of 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. Therefore, they cannot be understood as limitations on this application. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "first", "second", "third", "fourth", "fifth", "sixth", and "seventh" are only used for the convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0104] An electric vehicle is a vehicle that relies on electricity for all or part of its operation. It consists of a vehicle frame, a battery, and an electric drive unit. The battery is typically mounted at the bottom of the frame, while the electric drive unit is typically installed at the front or rear of the frame. The battery provides electrical energy to the electric drive unit, which converts this electrical energy into mechanical energy to propel the vehicle.

[0105] In related technologies, batteries typically include a cell pack, a case cover, a frame, and a restraining structure. The case cover is mounted on the frame, the cell pack is housed within the frame, and the restraining structure is installed within the frame to restrain the cell pack from expanding. The frame is typically constructed by connecting multiple profiles and requires high strength, resulting in a relatively heavy frame. However, since the frame needs to accommodate the cell pack and the restraining structure, it also requires a relatively large height dimension, further increasing the frame's weight. This significantly reduces the battery's mass energy density, which in turn reduces the battery life of electric vehicles, hindering their widespread application.

[0106] In order to reduce the weight of the battery, the battery cell group in the battery provided in the embodiment of the present application is accommodated in the cavity of the box cover and fixedly connected to the box cover, and a constraint structure for constraining the expansion of the battery cell group is arranged on the box cover. Compared with the traditional method of arranging the battery cell group and the constraint structure in the battery frame, at least the height dimension of the frame can be reduced to reduce the weight of the frame, thereby effectively reducing the weight of the battery, improving the mass energy density of the battery, and effectively improving the endurance performance of the electric equipment.

[0107] The battery disclosed in the embodiments of the present application can be used in electric devices that use the battery as a power source. The electric device can be, but is not limited to, a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, and the like. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like. 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, and the like.

[0108] For the convenience of description, the following embodiments are described by taking an electric device according to an embodiment of the present application as a vehicle as an example.

[0109] Please refer to Figure 1, which is a structural diagram of a vehicle 1000 provided in an embodiment of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 300 and a motor 400. The controller 300 is used to control the battery 100 to power the motor 400, for example, for starting, navigating and driving the vehicle 1000.

[0110] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000 , but also 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 .

[0111] Please refer to Figure 2, which is an exploded view of a battery 100 according to an embodiment of the present application. Battery 100 includes a battery box and a cell pack 10, which is housed within the battery box. The battery box provides storage space for battery cells 11. The battery box may include a first portion and a second portion, which cover each other and together define a storage space for the cell pack 10. The first portion may be a hollow structure with one end open, and the second portion may be a plate-like structure, with the second portion covering the open side of the first portion, so that the first and second portions together define a storage space. Alternatively, the first and second portions may both be hollow structures with one end open, with the open side of the first portion covering the open side of the second portion. The battery box may have various shapes, such as a cylinder or a rectangular parallelepiped. In some embodiments, the battery box may form part of the bottom structure of the vehicle frame 200. For example, a portion of the battery box may form at least a portion of the floor of the vehicle frame 200, or a portion of the battery box may form at least a portion of a crossbeam or longitudinal beam of the vehicle frame 200.

[0112] The cell assembly 10 is the main body of the battery 100 and is used to store electrical energy. The cell assembly 10 includes a battery cell 11, which is the smallest storage unit for electrical energy. Referring to Figures 21 to 23 , the battery cell 11 includes a housing 111, an electrode assembly 112, and electrode terminals 113.

[0113] The housing 111 is a component used to provide an internal environment for the battery cell 11, which can accommodate the electrode assembly 112 and other functional components of the battery cell 11. The shape of the housing 111 can be, but is not limited to, a rectangular parallelepiped, a cylinder, a hexagonal prism, etc., and it is understood that the shape of the housing 111 can be determined based on the specific shape of the electrode assembly 112. The material of the housing 111 can be, but is not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0114] The electrode assembly 112 is a component in the battery cell 11 where electrochemical reactions occur. The number of electrode assemblies 112 can be one or more. The electrode assembly 112 is mainly made of a positive electrode sheet, a negative electrode sheet and a separator using a winding process or a stacking process. During the charge and discharge process of the battery cell 11, active ions (such as lithium ions) are embedded and released back and forth between the positive electrode sheet and the negative electrode sheet. The separator is arranged between the positive electrode sheet and the negative electrode sheet, which can prevent the positive and negative electrodes from short-circuiting and allow active ions to pass through. Among them, the positive electrode sheet may include a positive electrode collector, a positive electrode ear and a positive electrode active material. The positive electrode ear is connected to the positive electrode collector, and the positive electrode active material is arranged on at least one surface of the positive electrode collector. As an example, the positive electrode collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode active material is arranged on any one or both of the two opposite surfaces of the positive electrode collector. The negative electrode sheet may include a negative electrode collector, a negative electrode ear and a negative electrode active material. The negative electrode tab is connected to the negative electrode current collector, and the negative electrode active material is disposed on at least one surface of the negative electrode current collector. For example, the negative electrode current collector has two surfaces that face each other in the thickness direction, and the negative electrode active material is disposed on either or both of the two opposing surfaces of the negative electrode current collector. The separator is a separator. This application does not specifically limit the type of separator; any known porous separator with good chemical and mechanical stability may be used.

[0115] The electrode terminal 113 is a component that is electrically connected to the electrode assembly 112 for outputting electrical energy from the battery cell 11 or inputting electrical energy into the battery cell 11. The electrode terminal 113 can be disposed on the housing 111. A portion of the electrode terminal 113 extends into the internal environment of the battery cell 11 and is directly or indirectly connected to the positive or negative tab of the electrode assembly 112. Another portion of the electrode terminal 113 is exposed to the external environment of the battery cell 11 and is connected to components such as a busbar and a sampling device. The electrode terminal 113 can have a columnar structure, such as a cylindrical structure or a prismatic structure. The electrode terminal 113 can also have a plate-like structure, such as a circular plate or a square plate. The electrode terminal 113 can also have other irregular three-dimensional structures, which are not specifically limited here. The electrode terminal 113 can be made of a single conductive material or a plurality of conductive materials. The conductive materials can be, but are not limited to, copper, aluminum, nickel, zinc, iron, etc., which are not specifically limited here.

[0116] There can be multiple battery cells 11, and the multiple battery cells 11 can be connected in series, in parallel, or in a mixed connection. Mixed connection means that the multiple battery cells 11 are both connected in series and in parallel. The multiple battery cells 11 can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 11 is accommodated in a battery box. Of course, the battery 100 can also be a battery module composed of multiple battery cells 11 first connected in series, in parallel, or in a mixed connection, and the multiple battery modules are then connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in a battery box. The battery 100 may also include other functional components. For example, the battery 100 may also include a busbar for achieving electrical connection between the multiple battery cells 11.

[0117] Each battery cell 11 may be a secondary battery or a primary battery. A secondary battery refers to a battery cell 11 that can be recharged to activate the active material after the battery cell 11 is discharged and can continue to be used. A primary battery refers to a battery cell 11 that cannot be recharged to activate the active material after the battery cell 11's power is exhausted and can continue to be used. The battery cell 11 may also be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., but is not limited thereto. The battery cell 11 may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or a battery cell 11 of another shape. Prismatic battery cells include square-shell battery cells, blade-shaped battery cells, and polygonal prismatic battery cells. Polygonal prismatic battery cells are, for example, hexagonal prismatic battery cells. This application does not have any special restrictions.

[0118] The battery 100 provided in the embodiment of the present application is described below with reference to the accompanying drawings. For the convenience of description, the direction parallel to the central axis of the wheel 500 of the vehicle 1000 is defined as the width direction of the battery 100. It should be noted that the central axis of the wheel 500 refers to the central axis of the wheel 500 when the driving direction of the vehicle 1000 is a straight line, such as the positive and negative directions of the Y axis shown in Figures 1 to 6, 8, 11 to 14 and 16. The direction perpendicular to the central axis of the wheel 500 and parallel to the support plane of the vehicle 1000 is defined as the length direction of the battery 100. It should be noted that the support plane refers to all the directions tangent to the vehicle 1000 when the vehicle 1000 is in a driving state or a stationary state. The plane of the wheel surface on the side of the wheel 500 facing away from the frame 200 is the positive and negative directions of the X-axis as shown in Figures 1 to 18 and 20, and the direction perpendicular to the above-mentioned width direction and the above-mentioned length direction is defined as the height direction of the battery 100, as shown in Figures 2, 3, 6, 7, 9 to 11, 13 to 15, 17, 18 and 20. The direction from the battery 100 to the above-mentioned support plane and perpendicular to the above-mentioned support plane is defined as the gravity direction of the battery 100, as shown in Figures 2, 3, 6, 7, 9 to 11, 13 to 15, 17, 18 and 20.

[0119] First, please refer to Figures 2, 3 and 11 together. An embodiment of the present application provides a battery 100, including a cell group 10, a box cover 20 and a constraint structure 30. The box cover 20 is used to fix the cell group 10. The box cover 20 has a cavity 23, which is used to accommodate at least part of the cell group 10. The constraint structure 30 is used to constrain the expansion of the cell group 10. The constraint structure 30 is arranged on the box cover 20.

[0120] It should be noted that the above-mentioned box cover 20 and the restraining structure 30 can constitute the first part of the above-mentioned battery box, and can also constitute the second part of the above-mentioned battery box. In some embodiments, the battery 100 may further include a frame 40 and a protective plate 50. The box cover 20, the frame 40, and the protective plate 50 are connected in sequence along the gravity direction of the battery 100. In other words, the box cover 20 is provided on one side of the frame 40 along the height direction of the battery 100, and the protective plate 50 is provided on the other side of the frame 40 along the height direction of the battery 100. The box cover 20 and the restraining structure 30 constitute the first part of the above-mentioned battery box, and the frame 40 and the protective plate 50 constitute the second part of the above-mentioned battery box. The box cover 20, the frame 40, and the protective plate 50 enclose the above-mentioned accommodation space, wherein the cavity 23 of the box cover 20 constitutes a part of the accommodation space, the battery cell group 10 is accommodated in the accommodation space, and at least a part of the battery cell group 10 is accommodated in the cavity 23.

[0121] The box cover 20 is arranged on one side of the frame 40 to block the opening at one end of the above-mentioned accommodating space. The material of the box cover 20 can be, but is not limited to, aluminum, aluminum alloy, iron, stainless steel, copper, etc. The shape of the box cover 20 can be, but is not limited to, circular, rectangular, square, etc. In some embodiments, the box cover 20 can be an integrally formed component, that is, the box cover 20 is made using an integral forming process, for example, the box cover 20 is integrally formed using a stamping process. In other embodiments, the box cover 20 can also be a split connecting component, for example, the box cover 20 includes multiple parts, and the multiple parts are connected to each other after being separately formed. The connection method between the various parts can be, but is not limited to, welding, fastening connection, bonding, etc., and the materials of the various parts can be the same or different. The box cover 20 is connected to the frame 40, and the connection method between the box cover 20 and the frame 40 can be, but is not limited to, welding, bonding, fastening connection, etc.

[0122] The battery cell group 10 is connected to the box cover 20 . The connection between the battery cell group 10 and the box cover 20 may be, but is not limited to, bonding, welding, fastening, etc.

[0123] In some embodiments, multiple battery cells 11 can be directly connected in series, in parallel, or in a mixed manner, and then a battery cell group 10 composed of multiple battery cells 11 can be housed in a battery box. The housing 111 is connected to the box cover 20, and the electrode terminals 113 are provided on other parts of the housing 111 except for the part used for connection to the box cover 20. For example, the electrode terminals 113 are provided on the side of the housing 111 facing away from the box cover 20 along the height direction of the battery 100. In this case, the battery cell 11 can be a square-shell battery cell, a cylindrical battery cell, or a prismatic battery cell. For another example, the electrode terminals 113 are provided on one side or two opposite sides of the housing 111 along the width direction of the battery 100. In this case, the battery cell 11 can be a blade-shaped battery cell. For another example, the electrode terminals 113 are provided on one side or two opposite sides of the housing 111 along the length direction of the battery 100. In this case, the battery cell 11 can be a blade-shaped battery cell.

[0124] In other embodiments, the battery 100 may also be a battery module formed by first connecting multiple battery cells 11 in series, parallel, or in a mixed series connection. The multiple battery modules are then connected in series, parallel, or in a mixed series connection to form a battery cell group 10 and housed in a battery box. The battery module includes a housing and electrical leads. The multiple battery cells 11 are housed in the housing. The electrical leads are directly or indirectly connected to the electrode terminals 113 of the battery cells 11 to output electrical energy from or input electrical energy into the battery cells 11. The housing is directly connected to the box cover 20, and the electrical leads are provided at locations other than the location for connection to the box cover 20. For example, the electrical leads are provided on a side of the housing facing away from the box cover 20 along the height direction of the battery 100. For another example, the electrical leads are provided on one side or two opposite sides of the housing along the width direction of the battery 100. For another example, the electrical leads are provided on one side or two opposite sides of the housing along the length direction of the battery 100.

[0125] The restraining structure 30 is a component used to restrain the expansion of the cell group 10. It is understood that when the cell group 10 expands, the expansion force generated by the cell group 10 acts on the restraining structure 30, which can exert a reaction force on the cell group 10. This reaction force resists the expansion force of the cell group 10, thereby restraining the expansion of the cell group 10. The restraining structure 30 can be, but is not limited to, a clamping structure, a push-pushing structure, etc.

[0126] The frame 40 is a supporting component of the battery 100. The frame 40 can be made of, but is not limited to, aluminum, aluminum alloy, iron, stainless steel, copper, and the like. The shape of the frame 40 can be, but is not limited to, circular, rectangular, or square. In some embodiments, the frame 40 can include multiple parts, each formed separately and then interconnected. The connection between the parts can be, but is not limited to, welding, fastening, mortise and tenon joints, and the materials of the parts can be the same or different.

[0127] The protective plate 50 is a protective component of the battery 100. The protective plate 50 is provided on the side of the frame 40 facing away from the box cover 20 to block the opening of the above-mentioned storage space away from the box cover 20 and protect the battery cell group 10. The material of the protective plate 50 can be, but is not limited to, aluminum, aluminum alloy, iron, stainless steel, copper, etc. The connection method between the protective plate 50 and the frame 40 can be, but is not limited to, welding, bonding, fastening connection, etc. In some embodiments, the protective plate 50 can be an integrally formed component, that is, the protective plate 50 is made using an integral molding process, and the integral molding process can be, but is not limited to, a die-casting molding process, a casting molding process, etc. In other embodiments, the protective plate 50 can be a split connection component, for example, the protective plate 50 includes multiple parts, and the multiple parts are connected together after being separately molded. The connection method between the multiple parts can be, but is not limited to, welding, bonding, etc., and the materials of the various parts can be the same or different.

[0128] The cell group 10 in the battery 100 provided in the embodiment of the present application is accommodated in the cavity 23 of the box cover 20 and fixedly connected to the box cover 20, and a constraint structure 30 for constraining the expansion of the cell group 10 is provided on the box cover 20. Compared with the traditional method of arranging the cell group and the constraint structure in the battery frame, at least the height dimension of the frame 40 can be reduced to reduce the weight of the frame 40, thereby effectively reducing the weight of the battery 100, improving the mass energy density of the battery 100, and effectively improving the endurance performance of the electric device.

[0129] In some embodiments of the present application, please refer to FIG. 3 and FIG. 11 . The restraint structure 30 includes two beam structures 31 spaced apart from each other. The two beam structures 31 cooperate to clamp the battery cell group 10 .

[0130] In some embodiments, a beam structure 31 can be disposed within the cavity 23. Two beam structures 31 are parallel to each other and spaced apart from each other. The battery cell assembly 10 is positioned between the two beam structures 31, so that the two beam structures 31 can cooperate with each other to clamp the battery cell assembly 10, thereby resisting the expansion force of the battery cell assembly 10. The beam structures 31 can be made of, but are not limited to, aluminum, aluminum alloys, iron, stainless steel, copper, etc. It is understood that the beam structures 31 can extend along the width of the battery 100. In this case, the two beam structures 31 are spaced apart from each other along the length of the battery 100. The beam structures 31 can also extend along the length of the battery 100. In this case, the two beam structures 31 are spaced apart from each other along the width of the battery 100. In some embodiments, the beam structures 31 can be connected to the box cover 20. The connection between the beam structures 31 and the box cover 20 can be, but is not limited to, welding, fastening, bonding, etc.

[0131] By adopting the above technical solution, under the clamping action of the two beam structures 31 , the expansion force of the battery cell group 10 can be resisted, thereby limiting the expansion and deformation of the battery cell group 10 and effectively improving the safety performance of the battery 100 .

[0132] In some embodiments of the present application, please refer to Figures 3, 4, 11 and 12 together. The box cover 20 includes a cover plate 21 and an enclosing structure 22 connected to the cover plate 21. The enclosing structure 22 and the cover plate 21 enclose a cavity 23, and the beam structure 31 is connected to at least one of the cover plate 21 and the enclosing structure 22.

[0133] The enclosure structure 22 forms the peripheral wall of the box cover 20. The enclosure structure 22 defines the aforementioned accommodating cavity 23 and surrounds at least a portion of the aforementioned battery cell assembly 10. The enclosure structure 22 is disposed on one side of the frame 40 facing away from the aforementioned protective plate 50 along the height direction of the battery 100. The cover plate 21 is disposed on the other side of the enclosure structure 22 along the height direction of the battery 100 to seal the opening of one end of the aforementioned accommodating cavity along the height direction of the battery 100. In some embodiments, the box cover 20 can be an integrally molded component. In other words, the enclosure structure 22 and the cover plate 21 are integrally molded. For example, the box cover 20 is a stamped part, i.e., the enclosure structure 22 and the cover plate 21 are integrally molded using a stamping process. If the box cover 20 is an integrally molded component, the material of the enclosure structure 22 and the cover plate 21 can be the same. In other words, the box cover 20 can be made of a single material. For example, the material of the box cover 20 can be an aluminum alloy. In other embodiments, the box cover 20 may be a separate connecting component. In other words, the enclosing structure 22 and the cover plate 21 are separately formed and then connected to each other. For example, the enclosing structure 22 and the cover plate 21 are separately formed using a stamping process and then connected to each other. The connection between the enclosing structure 22 and the cover plate 21 may be, but is not limited to, welding, bonding, or fastening. In the case where the box cover 20 is a separate connecting component, the material of the enclosing structure 22 and the cover plate 21 can be the same. In other words, the box cover 20 can be made of a single material, for example, aluminum alloy, while the material of the enclosing structure 22 and the cover plate 21 can be different, for example, the enclosing structure 22 is made of aluminum alloy and the cover plate 21 is made of stainless steel.

[0134] In some embodiments, the beam structure 31 is connected to the cover plate 21 , and the connection between the beam structure 31 and the cover plate 21 may be, but is not limited to, welding, bonding, fastening, etc.

[0135] In other embodiments, the beam structure 31 is connected to the enclosing structure 22, and one end of the beam structure 31 is connected to one side of the enclosing structure 22 and the other end of the beam structure 31 is connected to the other side of the enclosing structure 22. The connection method between the beam structure 31 and the enclosing structure 22 can be but is not limited to welding, bonding, fastening connection, etc.

[0136] In some other embodiments, the beam structure 31 is connected to the cover plate 21 , and the beam structure 31 is also connected to the surrounding structure 22 .

[0137] By adopting the above technical solution, the installation operation of the beam structure 31 is facilitated, so that the two beam structures 31 can clamp the battery cell group 10 more effectively.

[0138] In some embodiments of the present application, please refer to Figures 3 to 5, 8 to 13, and 16 to 18. The beam structure 31 includes a transition piece 311 and a beam body 312. The transition piece 311 includes a matching portion 3111 and an installation portion 3112 that are connected to each other. The matching portion 3111 is shaped to match and are connected to at least part of the inner wall surface of the surrounding structure 22. The beam body 312 is connected to the installation portion 3112.

[0139] The adapter 311 is a component used to connect the box cover 20 and the beam body 312 , wherein the matching portion 3111 is a portion connected to the surrounding structure 22 of the box cover 20 , and the mounting portion 3112 is a portion connected to the beam body 312 . The matching of the shape of the matching portion 3111 with at least part of the inner wall of the enclosing structure 22 means that the shape of the side of the matching portion 3111 facing the enclosing structure 22 is consistent with the shape of at least part of the inner wall of the enclosing structure 22. In other words, when part of the inner wall of the enclosing structure 22 has a surface structure of different shapes such as a convex surface, a curved surface, a corner surface, etc., the side of the matching portion 3111 facing the enclosing structure 22 also has a corresponding surface structure. The shape of the surface structure of the side of the matching portion 3111 facing the enclosing structure 22 is the same as the shape of the surface structure of the part of the inner wall of the enclosing structure 22, and the surface structure of the side of the matching portion 3111 facing the enclosing structure 22 can be matched with the surface structure of the part of the inner wall of the enclosing structure 22 in a concave-convex manner, so that the matching portion 3111 can be fit and connected to the part of the inner wall of the enclosing structure 22. In some embodiments, the adapter 311 can be an integrally formed component. In other words, the matching portion 3111 and the mounting portion 3112 are integrally formed. For example, the adapter 311 is a stamped component, meaning that the matching portion 3111 and the mounting portion 3112 are integrally formed using a stamping process. If the adapter 311 is an integrally formed component, the matching portion 3111 is made of the same material as the mounting portion 3112. In other words, the adapter 311 is made of a single material. The material of the adapter 311 can be, but is not limited to, aluminum, an aluminum alloy, iron, stainless steel, copper, etc. In other embodiments, the adapter 311 can be a separate connected component. In other words, the matching portion 3111 and the mounting portion 3112 are separately formed and then connected together. For example, the matching portion 3111 and the mounting portion 3112 are separately stamped and then connected together. The connection between the matching portion 3111 and the mounting portion 3112 can be, but is not limited to, welding, bonding, or fastening. When the adapter 311 is a separate connecting component, the material of the matching portion 3111 and the mounting portion 3112 can be the same. In other words, the adapter 311 can be made of a single material, such as, but not limited to, aluminum, aluminum alloy, iron, stainless steel, copper, etc. The material of the matching portion 3111 and the mounting portion 3112 can also be different. For example, the matching portion 3111 can be made of aluminum alloy, while the mounting portion 3112 can be made of stainless steel. The connection between the matching portion 3111 and the surrounding structure 22 can be, but not limited to, welding, bonding, or fastening.

[0140] The beam body 312 is the main component of the beam structure 31. The beam body 312 is used to abut against the battery cell group 10 to restrain the battery cell group 10. The beam body 312 can be a profile, that is, the beam body 312 can be integrally formed using a linear extrusion process. The material of the beam body 312 can be, but is not limited to, aluminum, aluminum alloy, iron, stainless steel, copper, etc. The beam body 312 can extend along the width direction of the battery 100, that is, the length direction of the beam body 312 is parallel to the width direction of the battery 100, the width direction of the beam body 312 is parallel to the length direction of the battery 100, and the height direction of the beam body 312 is parallel to the height direction of the battery 100. The beam body 312 can also extend along the length direction of the battery 100, that is, the length direction of the beam body 312 is parallel to the length direction of the battery 100, the width direction of the beam body 312 is parallel to the width direction of the battery 100, and the height direction of the beam body 312 is parallel to the height direction of the battery 100. The connection between the beam body 312 and the mounting portion 3112 may be, but is not limited to, welding, bonding, or fastening.

[0141] In the related art, in order to make the shape of the box cover 20 adapt to the actual application requirements, the box cover 20 is usually formed by a stamping process, so that the surrounding structure 22 of the box cover 20 can have an irregular shape structure according to different application requirements, and the beam body 312 is usually a profile part, that is, the beam body 312 is formed by a linear extrusion process, so that the end shape of the beam body 312 is difficult to match the shape of the surrounding structure 22 of the box cover 20. In this way, the beam body 312 can only be connected to the cover plate 21 of the box cover 20, but it is difficult to connect the two ends of the beam body 312 to the surrounding structure 22 of the box cover 20, resulting in a low connection strength between the beam body 312 and the box cover 20, which makes the beam body 312 easy to deform or shift after being subjected to the expansion force of the battery cell group 10 or other external forces, which is not conducive to improving the reliability of the battery 100.

[0142] By adopting the above technical solution, since the matching portion 3111 of the adapter 311 can match the shape of at least part of the inner wall surface of the surrounding structure 22 and be connected to each other, and the beam body 312 is connected to the mounting portion 3112 of the adapter 311, the beam body 312 can be connected to the surrounding structure 22 through the adapter 311, which facilitates the assembly of the beam body 312 and effectively improves the connection strength between the beam body 312 and the box cover 20, thereby effectively reducing the risk of deformation or displacement of the beam body 312 and effectively improving the reliability of the battery 100.

[0143] It is understandable that the material of the box cover 20 , the material of the adapter 311 and the material of the beam body 312 may be the same or different.

[0144] In some embodiments, referring to Figures 10 and 18 , the material of the cover 20 and the adapter 311 is the same, while the material of the beam 312 is different from that of the cover 20. For example, the cover 20 and the adapter 311 are made of steel, while the beam 312 is made of aluminum. The adapter 311 is welded to the cover 20. The beam structure 31 further includes a first fastener 313, which connects the beam 312 to the mounting portion 3112. The first fastener 313 may be, but is not limited to, a bolt, a screw, a rivet, or the like.

[0145] In the related art, when the box cover 20 is formed by a stamping process, the thickness of the wall of the box cover 20 is relatively small. In order to improve the structural strength of the box cover 20, the box cover 20 is usually made of high-strength steel. Since the beam body 312 needs to resist the expansion force of the battery cell group 10, the beam body 312 is usually made of aluminum as a cavity structure. Since steel and aluminum are difficult to be effectively welded, it is difficult to effectively connect the beam body 312 and the box cover 20, and the connection strength is poor.

[0146] By adopting the above technical solution, since the material of the box cover 20 is the same as that of the adapter 311, the adapter 311 is welded to the box cover 20, and the material of the beam body 312 is different from that of the box cover 20, the beam body 312 and the mounting portion 3112 are connected by the first fastener 313, so that the beam body 312 can be connected to the box cover 20 through the adapter 311, which facilitates the assembly of the beam body 312, effectively improves the connection strength between the beam body 312 and the box cover 20, thereby effectively reducing the risk of deformation or displacement of the beam body 312, and effectively improves the reliability of the battery 100.

[0147] In other embodiments, referring to Figures 3, 10, 11, and 18, the material of the box cover 20 and the adapter 311 is the same, while the material of the beam body 312 is different from that of the box cover 20. For example, the material of the box cover 20 and the adapter 311 is steel, while the material of the beam body 312 is aluminum. The box cover 20 and the adapter 311 are stamped parts, that is, the box cover 20 and the adapter 311 are formed using a stamping process, while the beam body 312 is a profile part, that is, the beam body 312 is formed using a linear extrusion process. The matching portion 3111 of the adapter 311 is shaped to match and welded to at least a portion of the inner wall of the enclosing structure 22 of the box cover 20. The beam structure 31 also includes a first fastener 313, and the beam body 312 is connected to the mounting portion 3112 via the first fastener 313.

[0148] By adopting the above technical solution, since the material of the box cover 20 is the same as that of the adapter 311, the matching portion 3111 of the adapter 311 is matched with and welded to at least part of the inner wall shape of the surrounding structure 22 of the box cover 20, while the material of the beam body 312 is different from that of the box cover 20. The beam body 312 and the mounting portion 3112 are connected by the first fastener 313, so that the beam body 312 can be connected to the surrounding structure 22 of the box cover 20 through the adapter 311, which facilitates the assembly of the beam body 312, effectively improves the connection strength between the beam body 312 and the box cover 20, thereby effectively reducing the risk of deformation or displacement of the beam body 312, and effectively improves the reliability of the battery 100.

[0149] In other embodiments, the material of the box cover 20, the material of the adapter 311, and the material of the beam 312 are the same. For example, the material of the box cover 20, the material of the adapter 311, and the material of the beam 312 are aluminum. In another example, the material of the box cover 20, the material of the adapter 311, and the material of the beam 312 are steel. The box cover 20 and the adapter 311 are stamped parts, that is, the box cover 20 and the adapter 311 are formed using a stamping process, and the beam 312 is a profile part, that is, the beam 312 is formed using a linear extrusion process. The matching portion 3111 of the adapter 311 is shaped to match and welded to at least a portion of the inner wall of the enclosing structure 22 of the box cover 20, and the beam 312 is welded to the mounting portion 3112.

[0150] By adopting the above technical solution, since the material of the box cover 20, the material of the adapter 311 and the material of the beam body 312 are the same, the matching portion 3111 of the adapter 311 is matched with and welded to at least part of the inner wall shape of the surrounding structure 22 of the box cover 20, and the beam body 312 is welded to the mounting portion 3112, so that the beam body 312 can be connected to the surrounding structure 22 of the box cover 20 through the adapter 311, which facilitates the assembly of the beam body 312, effectively improves the connection strength between the beam body 312 and the box cover 20, thereby effectively reducing the risk of deformation or displacement of the beam body 312, and effectively improves the reliability of the battery 100.

[0151] Of course, in other embodiments, the adapter 311 may not be provided, and the beam 312 may be directly connected to the box cover 20. For example, the material of the box cover 20 and the beam 312 may be the same, and the beam 312 and the box cover 20 may be directly welded. In another example, the material of the box cover 20 and the beam 312 may be different, and the beam 312 and the box cover 20 may be connected via fasteners.

[0152] In some embodiments of the present application, please refer to Figures 3 to 5 and Figures 8 to 10 together. The enclosing structure 22 includes a first wall body 221 and a second wall body 222 arranged opposite to each other. The adapter 311 includes a first adapter 311a and a second adapter 311b. The matching portion 3111 of the first adapter 311a is shaped to match at least a portion of the inner wall surface of the first wall body 221 and are connected to each other. The matching portion 3111 of the second adapter 311b is shaped to match at least a portion of the inner wall surface of the second wall body 222 and are connected to each other. One end of the beam body 312 is connected to the mounting portion 3112 of the first adapter 311a, and the other end of the beam body 312 is connected to the mounting portion 3112 of the second adapter 311b.

[0153] The first wall 221 and the second wall 222 are two oppositely disposed walls of the enclosing structure 22. In some embodiments, the first wall 221 and the second wall 222 may be two oppositely disposed walls of the enclosing structure 22 along the width direction of the battery 100. The beam 312 extends along the width direction of the battery 100. The matching portion 3111 of the first adapter 311a is connected to the first wall 221. The mounting portion 3112 of the first adapter 311a is connected to the matching portion 3111 of the first adapter 311a. One end of the beam 312 is connected to the mounting portion 3112 of the first adapter 311a. The matching portion 3111 of the second adapter 311b is connected to the second wall 222. The mounting portion 3112 of the second adapter 311b is connected to the matching portion 3111 of the second adapter 311b. The other end of the beam 312 is connected to the mounting portion 3112 of the second adapter 311b. In other embodiments, the first wall 221 and the second wall 222 can be two walls of the enclosing structure 22 that are oppositely arranged along the length direction of the battery 100, the beam body 312 extends along the length direction of the battery 100, the matching portion 3111 of the first adapter 311a is connected to the first wall 221, the mounting portion 3112 of the first adapter 311a is connected to the matching portion 3111 of the first adapter 311a, one end of the beam body 312 is connected to the mounting portion 3112 of the first adapter 311a, the matching portion 3111 of the second adapter 311b is connected to the second wall 222, the mounting portion 3112 of the second adapter 311b is connected to the matching portion 3111 of the second adapter 311b, and the other end of the beam body 312 is connected to the mounting portion 3112 of the second adapter 311b.

[0154] By adopting the above technical solution, both ends of the beam body 312 can be connected to the surrounding structure 22 through the adapter 311, further improving the connection strength between the beam body 312 and the box cover 20, thereby further reducing the risk of deformation or displacement of the beam body 312.

[0155] In some embodiments of the present application, please refer to Figures 6 and 10. Mounting cavities 3121 are opened at both ends of the beam body 312. The mounting portion 3112 of the first adapter 311a is embedded in one mounting cavity 3121, and the mounting portion 3112 of the second adapter 311b is embedded in the other mounting cavity 3121.

[0156] The mounting cavity 3121 provides a connection space between the beam body 312 and the mounting portion 3112. The mounting cavity 3121 extends through the end of the beam body 312 to form an opening, through which the mounting portion 3112 can enter the mounting cavity 3121 and connect with the beam body 312. The mounting cavity 3121 can also extend through one or both sides of the beam body 312 along the width direction, or through one or both sides of the beam body 312 along the height direction.

[0157] In some embodiments, the shape of the mounting portion 3112 of the first adapter 311a can be consistent with the shape of the corresponding mounting cavity 3121, so that the outer wall of the mounting portion 3112 of the first adapter 311a can fit closely with the wall of the corresponding mounting cavity 3121, thereby effectively limiting the relative position of the mounting portion 3112 of the first adapter 311a and the beam 312, further reducing the risk of deformation or displacement of the beam 312. Similarly, the shape of the mounting portion 3112 of the second adapter 311b can be consistent with the shape of the corresponding mounting cavity 3121, so that the outer wall of the mounting portion 3112 of the second adapter 311b can fit closely with the wall of the corresponding mounting cavity 3121, thereby effectively limiting the relative position of the mounting portion 3112 of the second adapter 311b and the beam 312, further reducing the risk of deformation or displacement of the beam 312.

[0158] By adopting the above technical solution, the mounting portion 3112 of the first adapter 311a and the mounting portion 3112 of the second adapter 311b can be set in the mounting cavity 3121 of the beam body 312, which effectively improves the integration between the mounting portion 3112 of the first adapter 311a, the mounting portion 3112 of the second adapter 311b and the beam body 312, making the connection structure between the beam body 312 and the first adapter 311a and the connection structure between the beam body 312 and the second adapter 311b more compact, effectively saving the space occupied by the connection structure between the beam body 312 and the first adapter 311a and the connection structure between the beam body 312 and the second adapter 311b, thereby effectively improving the volume energy density of the battery 100.

[0159] In some embodiments of the present application, referring to FIG. 10 , the beam 312 is connected to the cover plate 21 .

[0160] The connection between the beam body 312 and the cover plate 21 may be, but is not limited to, welding, bonding, fastening, etc.

[0161] By adopting the above technical solution, the connection strength between the beam body 312 and the box cover 20 is further improved, thereby further reducing the risk of deformation or displacement of the beam body 312.

[0162] In some embodiments of the present application, please refer to Figures 6, 7 and 10 together. The beam body 312 includes a first main body 3122 and a first flange 3123. One end of the first main body 3122 is connected to the mounting portion 3112 of the first adapter 311a, and the other end of the first main body 3122 is connected to the mounting portion 3112 of the second adapter 311b. The first flange 3123 is connected to one side of the first main body 3122 along the width direction of the beam body 312, and the first flange 3123 is connected to the cover plate 21.

[0163] The first main body 3122 is the main part of the beam body 312, which is used to connect the mounting portion 3112 of the first adapter 311a and the mounting portion 3112 of the second adapter 311b. It can be understood that when the mounting cavities 3121 are opened at both ends of the beam body 312, the mounting cavities 3121 are opened at both ends of the first main body 3122.

[0164] The first flange 3123 is used for connection to the cover plate 21. The length of the first body 3122 is parallel to the length of the first flange 3123. The first flange 3123 is connected to one side of the first body 3122 along the width of the beam 312. In other words, the first flange 3123 protrudes outward from one side of the first body 3122 along the width of the beam 312. The first flange 3123 has a first connection surface for connection to the cover plate 21, which is parallel to the surface of the cover plate 21. The connection between the first flange 3123 and the cover plate 21 may be, but is not limited to, welding, bonding, or fastening.

[0165] By adopting the above technical solution, the connection area between the beam body 312 and the cover plate 21 is effectively increased, and the connection strength between the beam body 312 and the box cover 20 is further improved, thereby further reducing the risk of deformation or displacement of the beam body 312.

[0166] In some embodiments of the present application, please refer to Figures 4, 7 and 10 together. The first flange 3123 is connected to the side of the first body 3122 facing the battery cell group 10, the cover plate 21 is provided with a first groove 211, the first flange 3123 is connected to the bottom of the first groove 211, and the depth of the first groove 211 is greater than or equal to the thickness of the first flange 3123.

[0167] The first flange 3123 is connected to the side of the first body 3122 facing the battery cell group 10 . In other words, the first flange 3123 protrudes outward from the side of the first body 3122 facing the battery cell group 10 .

[0168] The first groove 211 is used to provide clearance for the first flange 3123 to circumvent the battery cell pack 10. The first groove 211 is recessed on the surface of the cover plate 21 facing the beam 312. It is understood that the first groove 211 is a strip-shaped groove, and the length of the first groove 211 is parallel to the length of the first flange 3123. The bottom of the first groove 211 refers to the lowest point of the first groove 211 in the height direction of the battery 100. The depth of the first groove 211 refers to the dimension of the first groove 211 along the height direction of the battery 100, and the thickness of the first flange 3123 refers to the dimension of the first flange 3123 along the height direction of the battery 100. The depth of the first groove 211 is greater than or equal to the thickness of the first flange 3123. In other words, when the first flange 3123 is connected to the bottom of the first groove 211, the first flange 3123 will not protrude outside the first groove 211 along the height direction of the battery 100. In this way, when some battery cells 11 in the battery cell group 10 are placed in a position opposite to the first flange 3123, the first flange 3123 will not lift up these battery cells 11.

[0169] By adopting the above technical solution, the first groove 211 provides the first flange 3123 with an escape space for avoiding the battery cell group 10 , thereby effectively improving the interference between the first flange 3123 and the battery cell group 10 .

[0170] In some embodiments of the present application, please refer to Figures 6, 7 and 10 together. The beam body 312 also includes a second flange 3124, which is connected to the side of the first body 3122 facing away from the battery cell group 10, and the second flange 3124 is connected to the cover plate 21.

[0171] The second flange 3124 is used to connect to the cover plate 21. The length of the first body 3122, the length of the first flange 3123, and the length of the second flange 3124 are parallel. The second flange 3124 is connected to the side of the first body 3122 facing away from the cell group 10. In other words, the second flange 3124 protrudes outward from the side of the first body 3122 facing away from the cell group 10. The second flange 3124 has a second connection surface for connecting to the cover plate 21, and the second connection surface is parallel to the surface of the cover plate 21. The connection between the second flange 3124 and the cover plate 21 can be, but is not limited to, welding, bonding, or fastening.

[0172] By adopting the above technical solution, the connection area between the beam body 312 and the cover plate 21 is further increased, and the connection strength between the beam body 312 and the box cover 20 is further improved, thereby further reducing the risk of deformation or displacement of the beam body 312.

[0173] In some embodiments of the present application, the beam body 312 is welded to the cover plate 21 .

[0174] The welding method between the beam body 312 and the cover plate 21 can be, but is not limited to, arc welding, laser welding, ultrasonic welding, brazing, etc.

[0175] In some embodiments, in order to improve the welding stability between the beam body 312 and the cover plate 21, the material of at least part of the beam body 312 is the same as the material of at least part of the cover plate 21. For example, when the beam body 312 includes a first flange 3123 and a second flange 3124, the material of the first flange 3123, the material of the second flange 3124 and the material of the cover plate 21 are aluminum alloy, and the first flange 3123 and the second flange 3124 are welded to the cover plate 21; for another example, the overall material of the beam body 312 and the overall material of the cover plate 21 are aluminum alloy, and the beam body 312 and the cover plate 21 are welded.

[0176] By adopting the above technical solution, the beam body 312 can be connected to the cover plate 21 without opening additional connection holes on the cover plate 21, which effectively improves the sealing performance of the battery 100 and effectively simplifies the assembly process of the beam body 312 and the cover plate 21, thereby effectively improving the assembly efficiency of the battery 100.

[0177] In other embodiments of the present application, please refer to Figures 11 to 13. The enclosing structure 22 includes a first wall 221 and a second wall 222 arranged opposite to each other. The matching portion 3111 includes a first matching portion 3111a and a second matching portion 3111b. The first matching portion 3111a is shaped to match and are connected to at least a portion of the inner wall surface of the first wall 221, and the second matching portion 3111b is shaped to match and are connected to at least a portion of the inner wall surface of the second wall 222. One end of the mounting portion 3112 is connected to the first matching portion 3111a, and the other end of the mounting portion 3112 is connected to the second matching portion 3111b. The beam body 312 extends in a direction from the first matching portion 3111a toward the second matching portion 3111b.

[0178] It can be understood that in this embodiment, the mounting portion 3112 is a strip-shaped structure, and the length direction of the mounting portion 3112 and the length direction of the beam body 312 are the direction from the first matching portion 3111a to the second matching portion 3111b, that is, the length direction of the mounting portion 3112 is parallel to the length direction of the beam body 312.

[0179] The first wall 221 and the second wall 222 are two opposing walls of the enclosing structure 22. In some embodiments, the first wall 221 and the second wall 222 may be two opposing walls of the enclosing structure 22 arranged along the width direction of the battery 100. The first matching portion 3111a is connected to the first wall 221, the second matching portion 3111b is connected to the second wall 222, the mounting portion 3112 and the beam 312 extend along the width direction of the battery 100, one end of the mounting portion 3112 is connected to the first matching portion 3111a, the other end of the mounting portion 3112 is connected to the second matching portion 3111b, and the beam 312 is connected to the mounting portion 3112. In other embodiments, the first wall 221 and the second wall 222 can be two walls of the enclosing structure 22 that are oppositely arranged along the length direction of the battery 100, the first matching portion 3111a is connected to the first wall 221, the second matching portion 3111b is connected to the second wall 222, the mounting portion 3112 and the beam 312 extend along the length direction of the battery 100, one end of the mounting portion 3112 is connected to the first matching portion 3111a, the other end of the mounting portion 3112 is connected to the second matching portion 3111b, and the beam 312 is connected to the mounting portion 3112.

[0180] By adopting the above technical solution, one end of the mounting portion 3112 can be connected to the surrounding structure 22 through the first matching portion 3111a, and the other end of the mounting portion 3112 can be connected to the surrounding structure 22 through the second matching portion 3111b, thereby effectively improving the connection strength between the mounting portion 3112 and the box cover 20. Since the beam body 312 extends from the first matching portion 3111a toward the second matching portion 3111b, after the beam body 312 is connected to the mounting portion 3112, the connection strength between the beam body 312 and the box cover 20 can be improved, thereby further reducing the risk of deformation or displacement of the beam body 312.

[0181] In some embodiments of the present application, please refer to FIG. 14 , FIG. 15 and FIG. 16 to FIG. 18 , the beam body 312 defines a mounting cavity 3121 , and the mounting portion 3112 is embedded in the mounting cavity 3121 .

[0182] In some embodiments, the mounting cavity 3121 may be defined at the bottom of the beam body 312. The bottom of the beam body 312 refers to the lowest portion of the beam body 312 in the height direction of the battery 100. The bottom of the beam body 312 is recessed along the height direction of the battery 100 to form the mounting cavity 3121. It is understood that when the beam body 312 includes a first main body 3122, the mounting cavity 3121 may be defined at the bottom of the first main body 3122.

[0183] In some embodiments, the shape of the mounting portion 3112 can be consistent with the shape of the mounting cavity 3121, so that the outer wall of the mounting portion 3112 can fit into the cavity wall of the mounting cavity 3121, thereby effectively limiting the relative position of the mounting portion 3112 and the beam body 312, and further reducing the risk of deformation or displacement of the beam body 312.

[0184] By adopting the above-mentioned technical solution, the mounting portion 3112 can be set in the mounting cavity 3121 of the beam body 312, which effectively improves the integration between the mounting portion 3112 and the beam body 312, makes the connection structure between the beam body 312 and the adapter 311 more compact, and effectively saves the space occupied by the connection structure between the beam body 312 and the adapter 311, thereby effectively improving the volume energy density of the battery 100.

[0185] In some embodiments of the present application, referring to FIG. 18 , the mounting portion 3112 is connected to the cover plate 21 .

[0186] The connection between the mounting portion 3112 and the cover plate 21 may be, but is not limited to, welding, bonding, fastening, etc.

[0187] By adopting the above technical solution, the connection strength between the adapter 311 and the box cover 20 is effectively improved. After the beam body 312 is connected to the mounting portion 3112, the connection strength between the beam body 312 and the box cover 20 can be improved, thereby further reducing the risk of deformation or displacement of the beam body 312.

[0188] In some embodiments of the present application, please refer to Figures 13 and 18 together. The mounting portion 3112 includes a second main body 31121 and a third flange 31122. The beam body 312 is installed on the second main body 31121. The third flange 31122 is connected between the second main body 31121 and the cover plate 21.

[0189] The second body 31121 is the main part of the mounting portion 3112 and is used to connect to the beam body 312 . The third flange 31122 is used to connect to the cover plate 21 . The length direction of the second body 31121 is parallel to the length direction of the third flange 31122 .

[0190] The third flange 31122 can be connected to one side of the second body 31121 along the width of the mounting portion 3112. In other words, the third flange 31122 protrudes outward from one side of the second body 31121 along the width of the mounting portion 3112. It should be noted that the width of the mounting portion 3112 is parallel to the width of the beam 312. The third flange 31122 has a third connection surface for connecting to the cover plate 21, and the third connection surface is parallel to the plate surface of the cover plate 21. The connection between the third flange 31122 and the cover plate 21 can be, but is not limited to, welding, bonding, or fastening.

[0191] By adopting the above technical solution, the connection area between the mounting portion 3112 and the cover plate 21 is effectively increased, and the connection strength between the adapter 311 and the box cover 20 is further improved. After the beam body 312 is connected to the mounting portion 3112, the connection strength between the beam body 312 and the box cover 20 can be improved, thereby further reducing the risk of deformation or displacement of the beam body 312.

[0192] In some embodiments of the present application, please refer to Figures 4, 5, 12, 13 and 18 together. The third flange 31122 is connected to the side of the second body 31121 facing the battery cell group 10, the cover plate 21 is provided with a second groove 212, the third flange 31122 is connected to the bottom of the second groove 212, and the depth of the second groove 212 is greater than or equal to the thickness of the third flange 31122.

[0193] The third flange 31122 is connected to the side of the second body 31121 facing the battery cell group 10 . In other words, the third flange 31122 protrudes outward from the side of the second body 31121 facing the battery cell group 10 .

[0194] The second groove 212 is used to provide clearance for the third flange 31122 to circumvent the battery cell pack 10. The second groove 212 is recessed on the surface of the cover plate 21 facing the mounting portion 3112. It is understood that the second groove 212 is a strip-shaped groove, and its length is parallel to the length of the third flange 31122. The bottom of the second groove 212 refers to the lowest point of the second groove 212 in the height direction of the battery 100. The depth of the second groove 212 refers to the dimension of the second groove 212 along the height direction of the battery 100, and the thickness of the third flange 31122 refers to the dimension of the third flange 31122 along the height direction of the battery 100. The depth of the second groove 212 is greater than or equal to the thickness of the third flange 31122. In other words, when the third flange 31122 is connected to the bottom of the second groove 212, the third flange 31122 will not protrude outside the second groove 212 along the height direction of the battery 100. In this way, when some battery cells 11 in the battery cell group 10 are placed in a position opposite to the third flange 31122, the third flange 31122 will not lift up these battery cells 11.

[0195] By adopting the above technical solution, the second groove 212 provides the third flange 31122 with an escape space for avoiding the battery cell group 10 , thereby effectively improving the interference between the third flange 31122 and the battery cell group 10 .

[0196] In some embodiments of the present application, please refer to Figures 5, 13 and 18. The mounting portion 3112 also includes a fourth flange 31123, which is connected to the side of the second body 31121 facing away from the battery cell group 10, and the fourth flange 31123 is connected to the cover plate 21.

[0197] The fourth flange 31123 is used to connect to the cover plate 21. The length of the second body 31121, the length of the third flange 31122, and the length of the fourth flange 31123 are parallel. The fourth flange 31123 is connected to the side of the second body 31121 facing away from the cell group 10. In other words, the fourth flange 31123 protrudes outward from the side of the second body 31121 facing away from the cell group 10. The fourth flange 31123 has a fourth connection surface for connecting to the cover plate 21, and the fourth connection surface is parallel to the surface of the cover plate 21. The connection between the fourth flange 31123 and the cover plate 21 can be, but is not limited to, welding, bonding, or fastening.

[0198] By adopting the above technical solution, the connection area between the mounting portion 3112 and the cover plate 21 is further increased, and the connection strength between the adapter 311 and the box cover 20 is further improved. After the beam body 312 is connected to the mounting portion 3112, the connection strength between the beam body 312 and the box cover 20 can be improved, thereby further reducing the risk of deformation or displacement of the beam body 312.

[0199] In other embodiments of the present application, please refer to Figures 4 to 7 and Figure 10. When the adapter 311 includes a first adapter 311a and a second adapter 311b, the number of the second grooves 212 is two, and the third flange 31122 of the mounting portion 3112 of the first adapter 311a is connected to the bottom of one second groove 212, and the third flange 31122 of the mounting portion 3112 of the second adapter 311b is connected to the bottom of the other second groove 212. If the cover plate 21 is provided with a first groove 211, one second groove 212 can be connected to one end of the first groove 211, and the other second groove 212 can be connected to the other end of the first groove 211, so that the first groove 211 and the two second grooves 212 are connected to form a straight groove. In this way, only one straight groove can be provided on the cover plate 21, with the leading end of the straight groove serving as a second groove 212, the middle portion of the straight groove serving as the first groove 211, and the trailing end of the straight groove serving as the other second groove 212, thereby effectively simplifying the forming process of the first groove 211 and the second groove 212. If the beam body 312 includes a second flange 3124, the fourth flange 31123 of the mounting portion 3112 of the first adapter 311a is located at one end of the second flange 3124, and the fourth flange 31123 of the mounting portion 3112 of the second adapter 311b is located at the other end of the second flange 3124.

[0200] In some other embodiments of the present application, please refer to Figures 12 to 15 and 18. When the matching portion 3111 includes a first matching portion 3111a and a second matching portion 3111b, and one end of the mounting portion 3112 is connected to the first matching portion 3111a and the other end of the mounting portion 3112 is connected to the second matching portion 3111b, the third flange 31122 is connected to the side of the second body 31121 facing the battery cell group 10, and the fourth flange 31123 is connected to the side of the second body 31121 facing away from the battery cell group 10. The beam 312 can be installed on the second body 31121 but not directly connected to the cover plate 21, that is, the beam 312 may not include the first flange 3123 and the second flange 3124. In this way, only the second groove 212 can be opened on the cover plate 21, the third flange 31122 is connected to the bottom of the second groove 212, and the fourth flange 31123 is connected to the cover plate 21.

[0201] In some embodiments of the present application, the mounting portion 3112 is welded to the cover plate 21 .

[0202] The welding method between the mounting portion 3112 and the cover plate 21 may be, but is not limited to, arc welding, laser welding, ultrasonic welding, brazing, and the like.

[0203] In some embodiments, in order to improve the welding stability between the mounting portion 3112 and the cover plate 21, the material of at least part of the mounting portion 3112 is the same as the material of at least part of the cover plate 21. For example, when the mounting portion 3112 includes a third flange 31122 and a fourth flange 31123, the material of the third flange 31122, the material of the fourth flange 31123 and the material of the cover plate 21 are aluminum alloy, and the third flange 31122 and the fourth flange 31123 are welded to the cover plate 21; for another example, the overall material of the mounting portion 3112 and the overall material of the cover plate 21 are aluminum alloy, and the mounting portion 3112 is welded to the cover plate 21.

[0204] By adopting the above technical solution, the mounting portion 3112 can be connected to the cover plate 21 without opening an additional connection hole on the cover plate 21, which effectively improves the sealing performance of the battery 100 and effectively simplifies the assembly process of the mounting portion 3112 and the cover plate 21, thereby effectively improving the assembly efficiency of the battery 100.

[0205] In some embodiments of the present application, when the adapter 311 includes a first adapter 311a and a second adapter 311b, the material of the box cover 20, the material of the first adapter 311a, the material of the second adapter 311b and the material of the beam body 312 are the same. For example, the material of the box cover 20, the material of the first adapter 311a, the material of the second adapter 311b and the material of the beam body 312 are aluminum. The box cover 20, the first adapter 311a and the second adapter 311b are respectively integrally formed by a stamping process, and the beam body 312 is integrally formed by a linear extrusion process. The matching portion 3111 of the first adapter 311a is matched with and welded to at least a portion of the inner wall surface of the first wall 221 of the surrounding structure 22, and the matching portion 3111 of the second adapter 311b is matched with and welded to at least a portion of the inner wall surface of the second wall 222 of the surrounding structure 22. The third flange 31122 and the fourth flange 31123 of the mounting portion 3112 are welded to the cover plate 21. One end of the first main body 3122 of 312 is installed on the second main body 31121 of the mounting portion 3112 of the first adapter 311a, and the other end of the first main body 3122 of the beam body 312 is installed on the second main body 31121 of the mounting portion 3112 of the second adapter 311b. The first flange 3123 and the second flange 3124 of the beam body 312 are welded to the cover plate 21, thereby effectively improving the connection strength between the beam body 312 and the box cover 20, thereby effectively reducing the risk of deformation or displacement of the beam body 312, and effectively improving the reliability of the battery 100.

[0206] In some embodiments of the present application, when the matching portion 3111 includes a first matching portion 3111a and a second matching portion 3111b, and the mounting portion 3112 is connected between the first matching portion 3111a and the second matching portion 3111b, the material of the box cover 20 and the material of the adapter 311 are the same, and the material of the box cover 20 and the material of the beam body 312 are different. For example, the material of the box cover 20 and the material of the adapter 311 are steel, and the material of the beam body 312 is aluminum. The box cover 20 and the adapter 311 are respectively integrally formed by a stamping process, and the beam body 312 is integrally formed by a linear extrusion process. The first matching portion 3111a is matched with the shape of at least part of the inner wall surface of the first wall body 221 of the surrounding structure 22 and welded to each other. The second matching portion 3111b is matched with the shape of at least part of the inner wall surface of the second wall body 222 of the surrounding structure 22 and welded to each other. The third flange 31122 and the fourth flange 31123 of the mounting portion 3112 are welded to the cover plate 21, and the beam body 312 is connected to the second main body 31121 of the mounting portion 3112, thereby effectively improving the connection strength between the beam body 312 and the box cover 20, thereby effectively reducing the risk of deformation or displacement of the beam body 312, and effectively improving the reliability of the battery 100.

[0207] In some embodiments of the present application, please refer to Figures 7, 10, 15 and 18. The beam body 312 has a supporting surface 3126 and a supporting surface 3125. The supporting surface 3126 is arranged back to back with the battery cell group 10, and the supporting surface 3125 is arranged opposite to the battery cell group 10 and is used to abut the battery cell group 10 to resist the expansion force of the battery cell group 10.

[0208] It will be understood that when the beam body 312 includes the first main body 3122, the support surface 3126 and the abutment surface 3125 are provided on either side of the first main body 3122 along the width of the beam body 312. The support surface 3126 can be a plane perpendicular to the surface of the cover plate 21, or a sloped surface inclined relative to the surface of the cover plate 21, or a curved surface or other irregular surface structure. Similarly, the abutment surface 3125 can be a plane perpendicular to the surface of the cover plate 21, or a sloped surface inclined relative to the surface of the cover plate 21, or a curved surface or other irregular surface structure.

[0209] By adopting the above technical solution, the expansion force of the battery cell group 10 is effectively resisted, thereby effectively limiting the expansion and deformation of the battery cell group 10 , and effectively improving the safety performance of the battery 100 .

[0210] In some embodiments of the present application, please refer to FIG. 7 , FIG. 10 , FIG. 15 and FIG. 18 , the abutting surface 3125 is perpendicular to the cover plate 21 .

[0211] The abutment surface 3125 is perpendicular to the cover plate 21, that is, the abutment surface 3125 is flat and perpendicular to the plate surface of the cover plate 21. In the related art, the battery cells 11 in the battery cell group 10 or the battery module composed of multiple battery cells 11 are usually placed vertically on the cover plate 21. By making the abutment surface 3125 perpendicular to the cover plate 21, the abutment surface 3125 can be aligned with the side of the battery cell group 10 to the greatest extent possible, thereby effectively increasing the contact area between the beam body 312 and the battery cell group 10, making the force applied to the battery cell group 10 more uniform, and effectively improving the stress concentration between the beam body 312 and the battery cell group 10, thereby more effectively limiting the expansion and deformation of the battery cell group 10, further improving the safety performance of the battery 100.

[0212] In some embodiments of the present application, please refer to FIG. 7 , FIG. 10 , FIG. 15 and FIG. 18 , at least a portion of the support surface 3126 extends obliquely from the cover plate 21 toward the abutting surface 3125 .

[0213] In other words, the distance between at least part of the support surface 3126 and the abutment surface 3125 in the width direction of the beam body 312 gradually decreases along the direction from the cover plate 21 to the beam body 312, that is, the width of at least part of the beam body 312 gradually decreases along the direction from the cover plate 21 to the beam body 312.

[0214] By adopting the above technical solution, the support area of ​​the beam body 312 is effectively increased, the support strength of the beam body 312 is effectively improved, and the beam body 312 can more effectively resist the expansion force of the battery cell group 10, thereby further reducing the risk of deformation or displacement of the beam body 312.

[0215] In some embodiments of the present application, please refer to FIG. 7 , FIG. 10 , FIG. 15 and FIG. 18 , the support surface 3126 is a stepped surface, and the stepped surface extends step by step from the cover plate 21 toward the abutting surface 3125 .

[0216] In other words, the distance between the support surface 3126 and the abutment surface 3125 in the width direction of the beam body 312 gradually decreases along the direction from the cover plate 21 to the beam body 312, that is, the width of at least part of the beam body 312 gradually decreases along the direction from the cover plate 21 to the beam body 312.

[0217] By adopting the above technical solution, the support area of ​​the beam body 312 is effectively increased, the support strength of the beam body 312 is effectively improved, and the beam body 312 can more effectively resist the expansion force of the battery cell group 10, thereby further reducing the risk of deformation or displacement of the beam body 312.

[0218] In some embodiments of the present application, please refer to Figures 7, 10, 15 and 18 together. The abutment surface 3125 is perpendicular to the cover plate 21, and the support surface 3126 is a stepped surface. The stepped surface extends step by step from the cover plate 21 toward the abutment surface 3125, and at least a portion of the stepped surface extends obliquely from the cover plate 21 toward the abutment surface 3125.

[0219] It can be understood that the stepped surface can be a partial surface structure along the width direction of the beam body 312 facing away from the abutment surface 3125 and extending obliquely from the cover plate 21 toward the abutment surface 3125, or the stepped surface can be a partial surface structure along the height direction of the beam body 312 facing the cover plate 21 and extending obliquely from the cover plate 21 toward the abutment surface 3125.

[0220] By adopting the above-mentioned technical solution, the contact area between the beam body 312 and the battery cell group 10 can be effectively increased, so that the force on the battery cell group 10 is more evenly distributed, and the stress concentration between the beam body 312 and the battery cell group 10 is effectively improved, thereby more effectively limiting the expansion and deformation of the battery cell group 10, further improving the safety performance of the battery 100, and effectively increasing the support area of ​​the beam body 312, effectively improving the support strength of the beam body 312, so that the beam body 312 can more effectively resist the expansion force of the battery cell group 10, thereby further reducing the risk of deformation or displacement of the beam body 312.

[0221] In some embodiments of the present application, please refer to FIG. 3 , FIG. 8 to FIG. 10 , FIG. 11 , and FIG. 16 to FIG. 18 . The battery 100 further includes a first connecting member 32 . The first connecting member 32 is connected between two adjacent beam structures 31 .

[0222] The first connector 32 is a component used to connect two adjacent beam structures 31, and serves to limit the relative position of the two adjacent beam structures 31. For example, when the battery cell group 10 expands, the beam structure 31 is subjected to the expansion force of the battery cell group 10. At this time, the first connector 32 applies a pulling force to the beam structure 31 in the opposite direction of the expansion force of the battery cell group 10, thereby offsetting the expansion force of the battery cell group 10 to reduce the risk of deformation or displacement of the beam structure 31. In the case where the beam structure 31 includes an adapter 311 and a beam body 312, the first connector 32 is connected to the beam body 312. The material of the first connector 32 can be, but is not limited to, aluminum, aluminum alloy, iron, stainless steel, copper, etc. The connection method between the first connector 32 and the beam structure 31 can be, but is not limited to, welding, bonding, fastening connection, etc. The first connector 32 can be, but is not limited to, a limit bar, a limit plate, etc.

[0223] 3 , 10 , 11 , and 18 , the constraint structure 30 further includes a second fastener 33 , and the first connector 32 is connected to the beam structure 31 via the second fastener 33 . The second fastener 33 may be, but is not limited to, a bolt, a screw, a rivet, or the like.

[0224] In some embodiments, referring to Figures 3, 10, 11, and 18, when the first connector 32 is a limit bar, the number of first connectors 32 can be multiple. The number of first connectors 32 can be determined according to actual application needs. For example, the number of first connectors 32 can be two, three, four, five, six, etc. The multiple first connectors 32 are arranged in parallel along the length direction of the beam structure 31, with one end of the first connector 32 connected to one beam structure 31 and the other end of the first connector 32 connected to another beam structure 31.

[0225] In other embodiments, when the first connector 32 is a limit plate, the limit plate is positioned between two adjacent beam structures 31 and connects the two beam structures 31. In other embodiments, a cooling channel may be formed within the first connector 32 to provide space for the cooling medium to flow and exchange heat with the battery cell assembly 10. In other words, in this embodiment, the first connector 32 not only serves to limit the relative position of the two adjacent beam structures 31, but also serves as a heat exchange component to exchange heat with the battery cell assembly 10.

[0226] By adopting the above technical solution, the relative positions of two adjacent beam structures 31 are effectively restricted, thereby further reducing the risk of deformation or displacement of the beam structures 31.

[0227] In some embodiments of the present application, please refer to FIG. 3 and FIG. 11 , the first connecting member 32 is connected to a side of the beam structure 31 away from the cover plate 21 .

[0228] By adopting the above technical solution, the risk of interference between the first connecting member 32 and the battery cell group 10 is effectively reduced, and the first connecting member 32 and the beam structure 31 are easily connected.

[0229] In some embodiments of the present application, the box cover 20 is used to connect to an external frame (such as the frame 200 of the vehicle 1000 ).

[0230] The connection between the box cover 20 and the external frame can be, but is not limited to, fastening connection, welding, hook connection, etc.

[0231] In some embodiments, when the battery 100 is assembled to an external frame, the box cover 20, the frame 40 and the protective plate 50 are connected in sequence along the gravity direction of the battery 100, the side of the box cover 20 facing away from the frame 40 is used to connect to the external frame, and the battery cell group 10 is connected to the side of the box cover 20 facing the frame 40.

[0232] By adopting the above technical solution, at least part of the load of the battery cell group 10 can be directly transferred to the external frame through the box cover 20. In other words, at least part of the load of the battery cell group 10 can be borne by the external frame. This can reduce the strength requirements for other supporting components of the battery 100 and reduce the size of these supporting components. For example, the weight of the frame 40 of the battery 100 can be reduced, thereby effectively reducing the weight of the battery 100, improving the mass energy density of the battery 100, and effectively improving the endurance performance of the electric device.

[0233] In some embodiments of the present application, please refer to FIG. 3 and FIG. 11 , the battery 100 further includes a mounting assembly 60 , the box cover 20 is connected to the mounting assembly 60 , and the mounting assembly 60 is used to connect to an external frame.

[0234] The mounting assembly 60 is used to connect the box cover 20 to the external frame. The mounting assembly 60 can be, but is not limited to, a fastening assembly, a hooking assembly, a clamping assembly, etc. The mounting assembly 60 can be mounted on the cover plate 21 of the box cover 20 or on the enclosure structure 22 of the box cover 20.

[0235] By adopting the above technical solution, it is convenient to connect the box cover 20 to the external frame.

[0236] In some embodiments of the present application, please refer to Figures 3 and 11. At least part of the mounting assembly 60 includes a support member 61 and a second connecting member 62. The support member 61 is connected to the box cover 20, and the second connecting member 62 is connected to the support member 61 and is used to connect to the external frame.

[0237] It can be understood that the number of mounting components 60 can be multiple, a part of the mounting components 60 can be connected to the middle part of the cover plate 21, and a part of the mounting components 60 can be connected to the outer peripheral side of the cover plate 21 or the surrounding structure 22, wherein the part of the mounting components 60 connected to the middle part of the cover plate 21 can include a support member 61 and a second connecting member 62.

[0238] The support member 61 is a supporting component of the mounting assembly 60. The support member 61 may be, but is not limited to, a support plate, a support beam, or the like. The material of the support member 61 may be, but is not limited to, aluminum, an aluminum alloy, iron, stainless steel, copper, or the like. The connection between the support member 61 and the cover plate 21 may be, but is not limited to, welding, fastening, or bonding. The number of support members 61 may be one or more.

[0239] The second connector 62 is a component used to connect to the external frame. The second connector 62 may be, but is not limited to, a bolt, a screw, a rivet, a hook, or the like. The connection between the second connector 62 and the support member 61 may be, but is not limited to, welding or fastening. In some embodiments, each support member 61 is provided with one second connector 62. In other embodiments, each support member 61 is provided with multiple second connectors 62.

[0240] By adopting the above technical solution, it is convenient to connect the box cover 20 to the external frame.

[0241] In some embodiments of the present application, please refer to Figures 3, 4, 11 and 12, the battery cell group 10 is connected to the lower part of the cover plate 21, the support member 61 is connected to the cover plate 21, and the second connecting member 62 connects the support member 61 and the cover plate 21 to the external frame.

[0242] It can be understood that when the box cover 20 is connected to the external frame, the upper portion of the cover plate 21 is arranged opposite to the external frame, and the lower portion of the cover plate 21 is arranged opposite to the guard plate 50.

[0243] In some embodiments, the support member 61 is connected to the upper portion of the cover plate 21 and extends along the width direction of the battery 100. In other words, the support member 61 is an elongated structure, and the length direction of the support member 61 is parallel to the width direction of the battery 100. When the battery 100 is impacted by an external force on one side along the width direction, the impact energy can be transferred from one end of the support member 61 to the other end of the support member 61, effectively reducing the risk of the support member 61 bending, thereby effectively improving the impact resistance of the cover plate 21 of the box cover 20 in the width direction of the battery 100, effectively reducing the risk of deformation of the box cover 20 when the battery 100 is impacted by an external force on one side along the width direction, and thus effectively reducing the risk of damage to the battery cell pack 10.

[0244] Of course, in other embodiments, the support member 61 may also extend along the length direction of the battery 100 .

[0245] By adopting the above technical solution, the strength of the cover plate 21 is effectively improved, thereby effectively improving the bearing capacity of the cover plate 21 on the battery cell group 10.

[0246] In some embodiments of the present application, please refer to Figures 3, 11 and 19. The frame 40 includes a first support beam 41. The first support beam 41 includes a support beam body 411 and an energy-absorbing beam body 412. The energy-absorbing beam body 412 is connected to the side of the support beam body 411 facing away from the battery cell group 10.

[0247] The first support beam 41 is a supporting component of the frame 40. In some embodiments, the dimension of the first support beam 41 along the width direction of the battery 100 is smaller than the dimension of the first support beam 41 along the length direction of the battery 100, that is, the first support beam 41 extends along the length direction of the battery 100. For example, the first support beam 41 extends straight along the length direction of the battery 100. In another example, the first support beam 41 bends and extends along the length direction of the battery 100. There may be two first support beams 41, with the two first support beams 41 spaced apart along the width direction of the battery 100. In other embodiments, the dimension of the first support beam 41 along the length direction of the battery 100 is smaller than the dimension of the first support beam 41 along the width direction of the battery 100. That is, the first support beam 41 extends along the width direction of the battery 100. For example, the first support beam 41 extends straight along the width direction of the battery 100. In another example, the first support beam 41 bends and extends along the width direction of the battery 100. There may be two first support beams 41, with the two first support beams 41 spaced apart along the length direction of the battery 100.

[0248] The support beam 411 is the main supporting component of the first support beam 41, and the energy-absorbing beam 412 is used to absorb the external force impact energy received by the first support beam 41. In some embodiments, the energy-absorbing beam 412 can be a strip-shaped structure and extend along the length direction of the support beam 411. In other embodiments, the energy-absorbing beam 412 can include a plurality of energy-absorbing parts (not shown in the figure), and the plurality of energy-absorbing parts are spaced apart along the length direction of the support beam 411. In some embodiments, the support beam 411 and the energy-absorbing beam 412 can be an integrally formed component, for example, the support beam 411 and the energy-absorbing beam 412 are integrally formed by a linear extrusion process. In other embodiments, the support beam 411 and the energy-absorbing beam 412 can be separate components, for example, the support beam 411 and the energy-absorbing beam 412 are separately formed and then connected to each other, and the connection method between the support beam 411 and the energy-absorbing beam 412 can be, but is not limited to, welding, fastening connection, etc. In the case where the supporting beam 411 and the energy-absorbing beam 412 are separate components, the material of the supporting beam 411 and the material of the energy-absorbing beam 412 can be the same, for example, the material of the supporting beam 411 and the material of the energy-absorbing beam 412 are aluminum alloy. The material of the supporting beam 411 and the material of the energy-absorbing beam 412 can also be different, for example, the material of the supporting beam 411 is aluminum alloy, and the material of the energy-absorbing beam 412 is stainless steel.

[0249] In some embodiments, the frame 40 may further include a second support beam 42 connected between the two first support beams 41. The second support beam 42 is another supporting component of the frame 40. The material of the second support beam 42 may be, but is not limited to, aluminum, aluminum alloy, iron, stainless steel, copper, etc. When the first support beam 41 extends along the length of the battery 100, the dimension of the second support beam 42 along the length of the battery 100 is smaller than the dimension of the second support beam 42 along the width of the battery 100. That is, the second support beam 42 extends along the width of the battery 100. For example, the second support beam 42 extends straight along the width of the battery 100, or, for example, the second support beam 42 extends in a curved manner along the width of the battery 100. The number of second support beams 42 may be two, and the two second support beams 42 are spaced apart along the length of the battery 100. When the first support beam 41 extends along the width direction of the battery 100, the dimension of the second support beam 42 along the width direction of the battery 100 is smaller than the dimension of the second support beam 42 along the length direction of the battery 100. That is, the second support beam 42 extends along the length direction of the battery 100. For example, the second support beam 42 extends straight along the length direction of the battery 100, or the second support beam 42 extends in a curved manner along the length direction of the battery 100. The number of second support beams 42 can be two, and the two second support beams 42 are spaced apart along the width direction of the battery 100. The second support beam 42 can be provided with an electrical interface for connecting to a high-voltage box, a pipe interface for connecting to a thermal management component, etc.

[0250] By adopting the above technical solution, when the outer side of the battery 100 is impacted by external force, the energy-absorbing beam 412 can effectively absorb the impact energy, thereby effectively improving the situation where the impact energy is transmitted to the battery cell group 10 through the frame 40, and effectively reducing the risk of damage to the battery cell group 10.

[0251] In some embodiments of the present application, please refer to Figure 19, the energy absorbing beam 412 includes a main beam 4121 and a first energy absorbing body 4122, the main beam 4121 is connected to the side of the supporting beam 411 facing away from the battery cell group 10 and has a first energy absorbing cavity 4123, and the first energy absorbing body 4122 is arranged in the first energy absorbing cavity 4123.

[0252] Main beam 4121 is the main portion of energy-absorbing beam 412. Main beam 4121 is hollow, and the cavity within main beam 4121 constitutes the aforementioned first energy-absorbing cavity 4123. First energy-absorbing cavity 4123 provides a collapsible space for main beam 4121. When energy-absorbing beam 4121 is impacted by an external force, main beam 4121 collapses and deforms inward, effectively absorbing the impact energy. The cross-sectional shape of main beam 4121 can be, but is not limited to, square, circular, or triangular.

[0253] The first energy absorber 4122 supports the main beam 4121 and provides secondary energy absorption. Specifically, when the energy absorber 4121 is impacted by an external force and the main beam 4121 collapses and deforms due to absorbing the impact energy, the main beam 4121 compresses the first energy absorber 4122, causing it to collapse and deform accordingly, thereby achieving secondary energy absorption. The first energy absorber 4122 may be, but is not limited to, energy absorbing ribs, energy absorbing adhesive, or the like.

[0254] By adopting the above technical solution, when the outer side of the battery 100 is impacted by external force, the impact energy can be transmitted to the first energy-absorbing body 4122 through the main beam 4121, causing the main beam 4121 and the first energy-absorbing body 4122 to deform in turn, so that the energy-absorbing beam 412 can absorb the impact energy more effectively, further reducing the risk of damage to the battery cell group 10.

[0255] In some embodiments of the present application, please refer to Figure 20, the protective plate 50 includes a first plate body 51, a second plate body 52 and a second energy absorbing body 53, the first plate body 51 and the second plate body 52 are spaced apart along the height direction of the battery 100 to form a second energy absorbing cavity 54, and the second energy absorbing body 53 is arranged in the second energy absorbing cavity 54.

[0256] The first plate 51 and the second plate 52 together constitute the main body of the protective plate 50. The first plate 51 and the second plate 52 are spaced apart along the height direction of the battery 100 to form a second energy absorption cavity 54. It can be understood that the first plate 51 and the second plate 52 are parallel to each other, and the plate surface of the first plate 51 and the plate surface of the second plate 52 are opposite and spaced apart. The first plate 51 can be arranged on the side of the second plate 52 facing away from the box cover 20, or the second plate 52 can be arranged on the side of the first plate 51 facing away from the box cover 20. The first plate 51 and the second plate 52 are connected together by necessary connecting structures.

[0257] The second energy absorbing body 53 plays a role of secondary energy absorption, that is, when the main body composed of the first plate body 51 and the second plate body 52 is impacted by an external force, the main body squeezes the second energy absorbing body 53, causing the second energy absorbing body 53 to collapse and deform, thereby achieving the purpose of secondary energy absorption. The second energy absorbing body 53 can be, but is not limited to, energy absorbing ribs, energy absorbing glue, etc. The material of the first plate body 51, the material of the second plate body 52, and the material of the second energy absorbing body 53 can be the same, for example, the material of the first plate body 51, the material of the second plate body 52, and the material of the second energy absorbing body 53 are aluminum alloy. The material of the first plate body 51, the material of the second plate body 52, and the material of the second energy absorbing body 53 can be different, for example, the material of the first plate body 51 and the material of the second plate body 52 are aluminum alloy, and the material of the second energy absorbing body 53 is stainless steel.

[0258] By adopting the above technical solution, when the bottom of the battery 100 is impacted by external force, the impact energy can be transferred to the second energy absorber 53, causing the second energy absorber 53 to deform, so that the protective plate 50 can absorb the impact energy more effectively, further reducing the risk of damage to the battery cell group 10.

[0259] In some embodiments of the present application, the battery cell assembly 10 is bonded to the box cover 20 .

[0260] In some embodiments, an adhesive layer may be coated on the box cover 20 , and the battery cell group 10 may be placed on the adhesive layer. After the adhesive layer solidifies, the battery cell group 10 may be bonded to the box cover 20 .

[0261] In other embodiments, the battery cell group 10 may be placed on the box cover 20 , and adhesive may be poured onto the box cover 20 . After the adhesive layer solidifies, the battery cell group 10 may be bonded to the box cover 20 .

[0262] By adopting the above technical solution, the force between the battery cell group 10 and the box cover 20 can be made more uniform, and the assembly process of the battery cell group 10 and the box cover 20 can be simplified, thereby effectively improving the assembly efficiency of the battery 100.

[0263] In the second aspect, referring to FIG. 1 , an embodiment of the present application provides an electric device including the above-mentioned battery 100 .

[0264] The electric device provided in the embodiment of the present application effectively improves the reliability of the electric device because it adopts the above-mentioned battery 100.

[0265] The above are merely optional embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included within the scope of the claims of the present application.

Claims

1. A battery, characterized in that: The battery comprises: Battery cell group; A box cover, used for fixing and connecting the battery cell group, the box cover has a cavity, and the cavity is used for accommodating at least part of the battery cell group; The restraint structure is used to restrain the expansion of the battery cell group, and the restraint structure is arranged on the box cover.

2. The battery according to claim 1, characterized in that The restraining structure includes two beam structures arranged at intervals, and the two beam structures cooperate to clamp the battery cell group.

3. The battery according to claim 2, characterized in that The box cover comprises a cover plate and a surrounding structure connected to the cover plate, the surrounding structure and the cover plate are combined to form the cavity, and the beam structure is connected to at least one of the cover plate and the surrounding structure.

4. The battery according to claim 3, characterized in that The beam structure includes a transition piece and a beam body. The transition piece includes a matching portion and a mounting portion that are connected to each other. The matching portion is matched with at least part of the inner wall surface of the surrounding structure and is connected to each other. The beam body is connected to the mounting portion.

5. The battery according to claim 4, characterized in that The enclosing structure includes a first wall body and a second wall body that are arranged opposite to each other, and the adapter includes a first adapter and a second adapter. The matching portion of the first adapter is shaped to match with at least a portion of the inner wall surface of the first wall body and are connected to each other, and the matching portion of the second adapter is shaped to match with at least a portion of the inner wall surface of the second wall body and are connected to each other. One end of the beam body is connected to the mounting portion of the first adapter, and the other end of the beam body is connected to the mounting portion of the second adapter.

6. The battery according to claim 5, characterized in that Both ends of the beam body are provided with installation cavities, the installation portion of the first adapter is embedded in one of the installation cavities, and the installation portion of the second adapter is embedded in the other of the installation cavities.

7. The battery according to claim 5 or 6, characterized in that: The beam body is connected to the cover plate.

8. The battery according to claim 7, characterized in that The beam body includes a first main body and a first flange, one end of the first main body is connected to the mounting portion of the first adapter, the other end of the first main body is connected to the mounting portion of the second adapter, the first flange is connected to one side of the first main body along the width direction of the beam body, and the first flange is connected to the cover plate.

9. The battery according to claim 8, characterized in that The first flange is connected to a side of the first body facing the battery cell group, the cover plate is provided with a first groove, the first flange is connected to the bottom of the first groove, and the depth of the first groove is greater than or equal to the thickness of the first flange.

10. The battery according to claim 9, characterized in that The beam body further includes a second flange, the second flange is connected to a side of the first body facing away from the battery cell group, and the second flange is connected to the cover plate.

11. The battery according to any one of claims 7 to 10, characterized in that: The beam body is welded to the cover plate.

12. The battery according to claim 4, characterized in that The enclosing structure includes a first wall body and a second wall body that are arranged opposite to each other, and the matching part includes a first matching part and a second matching part. The first matching part is matched with at least a part of the inner wall surface of the first wall body and connected to each other, and the second matching part is matched with at least a part of the inner wall surface of the second wall body and connected to each other. One end of the mounting part is connected to the first matching part, and the other end of the mounting part is connected to the second matching part. The beam body extends in a direction from the first matching part to the second matching part.

13. The battery according to claim 12, characterized in that The beam body is provided with an installation cavity, and the installation portion is embedded in the installation cavity.

14. The battery according to any one of claims 4 to 13, characterized in that: The mounting portion is connected to the cover plate.

15. The battery according to claim 14, characterized in that The mounting portion includes a second main body and a third flange, the beam body is mounted on the second main body, and the third flange is connected between the second main body and the cover plate.

16. The battery according to claim 15, characterized in that The third flange is connected to the side of the second body facing the battery cell group, the cover plate is provided with a second groove, the third flange is connected to the bottom of the second groove, and the depth of the second groove is greater than or equal to the thickness of the third flange.

17. The battery according to claim 16, characterized in that The mounting portion further includes a fourth flange, the fourth flange is connected to a side of the second body facing away from the battery cell group, and the fourth flange is connected to the cover plate.

18. The battery according to any one of claims 14 to 17, characterized in that: The mounting portion is welded to the cover plate.

19. The battery according to any one of claims 4 to 18, characterized in that: The beam body has a supporting surface and a butting surface, wherein the supporting surface is arranged opposite to the battery cell group, and the butting surface is arranged opposite to the battery cell group and is used to butt against the battery cell group to resist the expansion force of the battery cell group.

20. The battery according to claim 19, characterized in that At least a portion of the support surface is inclined or extends in a stepped manner from the cover plate toward the abutting surface.

21. The battery according to any one of claims 3 to 20, characterized in that: The restraining structure further includes a first connecting member, wherein the first connecting member is connected between the two beam structures.

22. The battery according to claim 21, characterized in that The first connecting member is connected to a side of the beam structure away from the cover plate.

23. The battery according to any one of claims 3 to 22, characterized in that The box cover is used for connecting with the external frame.

24. The battery according to claim 23, characterized in that The battery also includes a mounting assembly, the box cover is connected to the mounting assembly, and the mounting assembly is used to connect to the external frame.

25. The battery according to claim 24, characterized in that At least part of the mounting assembly includes a support member and a second connecting member, wherein the support member is connected to the box cover, and the second connecting member is connected to the support member and is used to connect to the external frame.

26. The battery according to claim 25, characterized in that The battery cell group is connected to the lower part of the cover plate, the support member is connected to the cover plate, and the second connecting member connects the support member and the cover plate to the external frame.

27. The battery according to any one of claims 1 to 26, characterized in that The battery further comprises a frame and a guard plate, and the box cover, the frame and the guard plate are sequentially connected along the gravity direction of the battery.

28. The battery according to claim 27, characterized in that The frame body includes a first support beam, and the first support beam includes a support beam body and an energy absorbing beam body, and the energy absorbing beam body is connected to a side of the support beam body facing away from the battery cell group.

29. The battery according to claim 28, characterized in that The energy absorbing beam body comprises a main beam body and a first energy absorbing body. The main beam body is connected to a side of the supporting beam body facing away from the battery cell group and has a first energy absorbing cavity. The first energy absorbing body is arranged in the first energy absorbing cavity.

30. The battery according to any one of claims 27 to 29, characterized in that The guard plate includes a first plate body, a second plate body and a second energy absorbing body. The first plate body and the second plate body are spaced apart along the height direction of the battery to form a second energy absorbing cavity. The second energy absorbing body is arranged in the second energy absorbing cavity.

31. The battery according to any one of claims 1 to 30, characterized in that The battery cell group is bonded to the box cover.

32. An electric device, characterized in that: The electric device comprises the battery according to any one of claims 1-31.

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