Battery device and electric equipment

Abstract

The utility model discloses a battery device and electric equipment, and relates to the technical field of battery devices. The battery device comprises a box body, an expansion beam, a battery monomer, an electric control assembly and a connecting assembly, the box body is provided with a top wall and a bottom wall, and the top wall is provided with a sunken area which is sunken towards the direction of the bottom wall; the expansion beams are arranged in the box body and divide the internal space of the box body into a plurality of cavities; the concave area forms the top of part of the cavity, a first avoiding part is arranged at the position, close to the top wall, of the expansion beam, and the first avoiding part and the concave area are opposite and arranged at an interval; the battery monomers are arranged in the at least one cavity; the electric control assembly is arranged in the at least one cavity; the connecting assembly is connected between the electric control assembly and the battery monomers, the connecting assembly comprises a plurality of connecting pieces, and at least part of the connecting pieces are arranged between the first avoiding part and the sunken area in a penetrating manner. According to the technical scheme, friction between at least part of the connecting pieces and the inner wall of the box body can be reduced, and then abrasion to the part of the connecting pieces is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery device, in particular to a battery device and an electric equipment. BACKGROUND

[0002] The battery device includes a box body, a battery cell and an electric control assembly, and the electric control assembly is used for managing the battery cell. During the charging and discharging process, the battery cell is prone to swelling, which may cause the deformation of the box body. Therefore, an expansion beam is usually added in the box body to resist the swelling force. The expansion beam divides the internal space of the box body into multiple areas, and the battery cell and the electric control assembly are usually located in different areas, which causes at least part of the connecting members between the battery cell and the electric control assembly to be arranged across the beam. In addition, in the field of automobiles, the battery device is installed at the chassis position of the automobile. In order to reduce the influence of the thickness of the battery device on the landing area of the passengers in the vehicle cabin, a recess area is usually arranged in the box body corresponding to the landing area of the passengers.

[0003] However, the arrangement of the recess area occupies part of the space originally used to accommodate the connecting members, which causes the space used to accommodate the connecting members to be too small, resulting in that the connecting members are prone to being worn out due to friction with the inner wall of the box body. UTILITY MODEL CONTENT

[0004] In view of the above problems, the present application provides a battery device and an electric equipment, which aims to reduce the friction between the connecting members and the inner wall of the box body.

[0005] In a first aspect, the present application provides a battery device, which includes a box body, an expansion beam, a battery cell, an electric control assembly and a connecting assembly. The box body has a top wall and a bottom wall, and the top wall is provided with a recess area which is recessed towards the bottom wall. The expansion beam is arranged in the box body and divides the internal space of the box body into multiple cavities. The recess area constitutes the top of part of the cavities, and the expansion beam is provided with a first avoiding part at a position close to the top wall. The first avoiding part is arranged opposite and spaced apart from the recess area. The battery cell is arranged in at least one of the cavities. The electric control assembly is arranged in at least one of the cavities. The connecting assembly is connected between the electric control assembly and the battery cell, and the connecting assembly includes multiple connecting members. At least part of the connecting members are arranged between the first avoiding part and the recess area.

[0006] The technical scheme of the present application is that the first avoiding part is arranged at the position of the expansion beam close to the top wall, and the first avoiding part is arranged opposite and spaced apart from the recess area, so that an avoiding space is configured between the first avoiding part of the expansion beam and the recess area of the top wall. The avoiding space is used to mount at least part of the connecting members, thereby increasing the mounting space of the part of the connecting members, reducing the friction between at least part of the connecting members and the inner wall of the box body, and further reducing the electrical risk caused by the damage of the insulation layer of the connecting members due to friction.

[0007] In some embodiments, the distance between the first avoiding part and the top wall is not less than 10 mm; and / or, the distance between the first avoiding part and the top wall is not more than 50 mm. In this embodiment, the friction between the connecting part and the inner wall of the box can be reduced, and the influence of the avoiding part on the structural strength of the expansion beam can be reduced.

[0008] In some embodiments, the side opposite to the recessed area of the first avoiding part is a first avoiding surface, and the first avoiding surface is arranged obliquely relative to the bottom wall. This embodiment has the advantages of facilitating the layout of the connecting part, simple layout, convenient maintenance, relatively simple process, and being able to adapt to different wiring schemes.

[0009] In some embodiments, the angle between the first avoiding surface and the bottom wall is not less than 105°, and / or, the angle between the first avoiding surface and the bottom wall is not more than 165°. The technical solution of this embodiment can provide a certain avoiding space while reducing the influence on the forming of the expansion beam.

[0010] In some embodiments, the top wall comprises a first segment, a second segment and a third segment arranged in sequence along a first direction; the second segment and the third segment are arranged as the recessed area, the second segment is arranged obliquely relative to the first segment, and the second segment is arranged obliquely relative to the third segment; the third segment and the bottom wall are provided with the electric control assembly, and the first segment and the bottom wall are provided with the battery monomer. In this embodiment, the head space can be increased without increasing the height of the seat H point; the first segment and the third segment are transitioned by using a slope, so that the floor slope of the foot compartment is smooth, and the foot feeling is more comfortable; in addition, the space corresponding to the recessed area is used to arrange the electric control assembly, so that the internal volume utilization rate of the box can be improved.

[0011] In some embodiments, the top wall further comprises a fourth segment and a fifth segment, the first segment, the second segment, the third segment, the fourth segment and the fifth segment are connected in sequence along the first direction, and the second segment is arranged opposite to the fourth segment; the fourth segment is arranged obliquely relative to the third segment, and the fourth segment is arranged obliquely relative to the fifth segment; the second segment, the third segment and the fourth segment are arranged as the recessed area; and the fifth segment and the bottom wall are provided with the battery monomer. This embodiment can further improve the internal volume utilization rate of the box and improve the structural strength of the top wall.

[0012] In some embodiments, the expansion beam is further provided with a support block near one side of the top wall; in the direction from the top wall to the bottom wall, the distance between the support block and the top wall is less than the distance between the first avoiding part and the top wall. This embodiment can reduce or alleviate the extrusion or wear of these components by the top wall.

[0013] In some embodiments, the distance between the first avoiding part and the top wall is not less than 5mm than the distance between the support block and the top wall, and / or the distance between the first avoiding part and the top wall is not more than 30mm than the distance between the support block and the top wall. This embodiment can improve the welding strength of the support block and the expansion beam at the welding position.

[0014] In some embodiments, the number of the support blocks is multiple, and the multiple support blocks are arranged along the length direction of the expansion beam. This embodiment improves the anti-denting capability of the top wall of the box body.

[0015] In some embodiments, the support block has multiple side surfaces, and adjacent side surfaces are connected by a round corner; or the battery device further comprises a buffer member, and the buffer member is wrapped around the circumferential side of the support block. This embodiment further reduces the risk of scratching the connecting member by the edge of the support block.

[0016] In some embodiments, the side of the support block close to the top wall is provided with a second avoiding part, and the second avoiding part is arranged opposite and spaced apart from the denting area. This embodiment can reduce the damage of the box body caused by the contact and friction between the support block and the top wall during vibration.

[0017] In some embodiments, the side of the support block close to the top wall is provided with a second avoiding part, and the second avoiding part is arranged opposite and spaced apart from the denting area. This embodiment can reduce the damage of the box body caused by the contact and friction between the support block and the top wall during vibration.

[0018] In some embodiments, the box body comprises a box body and a box cover; part of the box body constitutes the bottom wall, and at least part of the box cover constitutes the top wall; the box body has a receiving groove, the expansion beam is arranged in the receiving groove, and the receiving groove is divided into multiple sub-groove bodies by the expansion beam; the box cover is arranged at the groove opening of the receiving groove and is enclosed with the multiple sub-groove bodies to form multiple cavities.

[0019] The application also provides a power consuming device, which comprises the battery device according to any one of the preceding embodiments, and the battery device is used to provide electric energy.

[0020] In some embodiments, the power consuming device is a vehicle, the vehicle comprises a vehicle body, and the battery device is arranged in the vehicle body; the vehicle body has a length direction and a width direction; the top wall of the box body is provided with a first seating area, a foot area and a second seating area arranged in sequence along the length direction, the first seating area, the foot area and the second seating area are arranged along the width direction respectively, and the denting area is arranged as the foot area.

[0021] The above description is merely an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0022] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0023] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0024] Figure 2 This is a schematic diagram of the structure of a battery device according to some embodiments of this application;

[0025] Figure 3 This is a partial enlarged cross-sectional view of a battery device according to some embodiments of this application;

[0026] Figure 4 This is a partial enlarged view of a cross-sectional view of a battery device according to other embodiments of this application;

[0027] Figure 5 for Figure 3 or Figure 4 A partially enlarged cross-sectional view of the embodiment shown, with the battery cells and control components hidden.

[0028] Figure 6 This is a schematic diagram of the assembly structure of the box body and the expansion beam;

[0029] Figure 7 This is a schematic diagram of the assembly structure of the box body, expansion beams, and connecting parts;

[0030] Figure 8 for Figure 7 A partially enlarged view of the cross-sectional view at point AA;

[0031] Figure 9 for Figure 7 A partially enlarged view of the cross-sectional view at point BB.

[0032] The reference numerals in the detailed embodiments are as follows:

[0033] 1. Vehicle; 10. Battery unit; 20. Controller; 30. Motor;

[0034] 100, battery cell; 200, box body; 201, top wall; 200a, recessed area; 201a, first section; 201b, second section; 201c, third section; 201d, fourth section; 201e, fifth section; 202, bottom wall; 203, cavity; 204, first seating area; 205, foot area; 206, second seating area; 210, box body; 211, accommodating groove; 211a, sub-groove body; 220, box cover;

[0035] 300, electric control assembly; 400, expansion beam; 410, first avoiding part; 411, first avoiding surface; 420, mounting groove; 500, supporting block; 510, second avoiding part; 511, second avoiding surface; 512, mounting hole; 600, connecting assembly; 610, connecting piece; 620, fastener.

[0036] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments in conjunction with the drawings. DETAILED DESCRIPTION

[0037] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0039] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0040] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily mutually exclusive or alternative to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0041] In the description of the embodiments of the present application, the term "and / or" is only to describe the relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship. In the description of the embodiments of the present application, the term "a plurality of" means two or more (including two), and similarly, "a plurality of groups" means two or more groups (including two groups), and "a plurality of pieces" means two or more pieces (including two pieces).

[0042] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0043] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0044] With the development of market situation, the application range of power battery is more and more extensive. Not only in the energy storage system of water, fire, wind, solar energy and the like, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other transportation tools, and even in the field of aerospace. With the continuous expansion of these application fields, the market demand for power batteries is also increasing.

[0045] Optimization of battery device technology requires comprehensive consideration of multiple design factors, such as reliability, cycle life, discharge capacity, and charge-discharge rate. CTP (Cell to Pack) battery device is a highly integrated power battery technology that cancels or simplifies the module level in the traditional battery pack and directly integrates the battery monomer into the box to improve the energy density and reduce the cost. In the CTP battery device, the battery device usually includes a box, an electric control assembly arranged in the box, and a battery monomer, and the electric control assembly is used for managing the battery monomer. However, during the use of the battery device in the charging and discharging process, the battery monomer will swell and cause the box to deform correspondingly.

[0046] In order to resist the swelling force of the battery monomer, an expansion beam is usually arranged in the box; the expansion beam usually divides the internal space of the box into multiple areas, which makes at least part of the connecting pieces between the battery monomer and the electric control assembly need to be arranged across the expansion beam; at the same time, in the field of new energy vehicles, the battery device is installed at the chassis position of the automobile, in order to reduce the influence of the thickness of the battery device on the passenger landing area in the vehicle cabin, a recess area is usually arranged in the box corresponding to the passenger landing area to increase the riding comfort of the driver and passenger and reduce the fatigue caused by long-term riding.

[0047] In the related art, since the top of the expansion beam remains horizontal, the arrangement of the above-mentioned recess area compresses the space originally used to accommodate the connecting pieces, resulting in insufficient allocation space, which is easy to cause the connecting pieces to rub against the inner wall of the box and wear. It is found in practical application that the insulation layer outside the connecting piece (usually a wire harness or a flexible circuit board and other live components) may be damaged after long-term wear and tear. Although the connecting piece itself has an insulation protective layer, once this layer is damaged, and the gap between the connecting piece and the metal box inner wall is small, the electrical clearance requirement cannot be met, thereby causing insulation abnormality problems.

[0048] Based on this, in order to solve the problem that the connecting pieces are easy to rub against the inner wall of the box and cause wear, the technical scheme of the present application is arranged with a first avoiding part at the position of the expansion beam close to the top wall, the first avoiding part is arranged opposite and spaced apart from the recess area, so that the first avoiding part of the expansion beam and the recess area of the top wall are configured as an avoiding space, the avoiding space is used to install at least part of the connecting pieces, thereby increasing the installation space of the part of the connecting pieces, reducing the friction between the connecting pieces and the inner wall of the box, and further reducing the electrical risk caused by the damage of the insulation layer of the connecting pieces due to friction.

[0049] The battery device disclosed in the embodiments of the present application can be used in, but is not limited to, electric equipment such as vehicles, ships, or aircraft. The power supply system of the electric equipment can be composed of battery monomers, batteries, etc. disclosed in the present application, which is beneficial to alleviate and automatically adjust the deterioration of the cell swelling force, supplement the consumption of electrolyte, and improve the stability of battery performance and the service life of the battery.

[0050] The embodiments of the present application provide a power consumption device using a battery device as a power supply. The power consumption device can be, but is not limited to, an electric toy, an electric vehicle, an electric automobile, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0051] The following embodiments are described by taking a power consumption device as a vehicle as an example for the convenience of description. The power consumption device can be a vehicle in some embodiments of the present application. Figures 1 to 9 The reference signs with arrows indicate holes, surfaces, cavities or spaces.

[0052] Please refer to Figure 1 The vehicle 1 can be a fuel automobile, a gas automobile or a new energy automobile. The new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc. The vehicle 1 is internally provided with a battery. The battery can be arranged at the bottom, the head or the tail of the vehicle 1. The battery can be used for power supply of the vehicle 1. For example, the battery can be used as an operating power supply of the vehicle 1. The vehicle 1 can further include a controller 20 and a motor 30. The controller 20 is used to control the battery to supply power to the motor 30, for example, to meet the power demand of the vehicle 1 during starting, navigation and driving. In some embodiments of the present application, the battery can be used as an operating power supply of the vehicle 1, and can also be used as a driving power supply of the vehicle 1, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1.

[0053] Please refer to Figure 2 and Figure 3 The battery device 10 includes a box body 200 and a battery cell 100. The battery cell 100 is mounted in the box body 200. The box body 200 is used to provide a containing space for the battery cell 100. The box body 200 can adopt various structures. In some embodiments, the box body 200 can include a first part and a second part. The first part and the second part are overlapped with each other. The first part and the second part together define a containing space for containing the battery cell 100. The second part can be a hollow structure with one end open. The first part can be a plate-shaped structure. The first part is overlapped with the open side of the second part, so that the first part and the second part together define the containing space. The first part and the second part can also be hollow structures with one side open. The open side of the first part is overlapped with the open side of the second part. Of course, the box body 200 formed by the first part and the second part can have various shapes, such as a cylinder, a cuboid, etc.

[0054] In the battery device 10, the battery cells 100 can be multiple, and the multiple battery cells 100 can be connected in series or in parallel or in a mixed manner. The mixed manner means that the multiple battery cells 100 are connected in series and in parallel. The multiple battery cells 100 can be directly connected in series or in parallel or in a mixed manner, and are accommodated in the case 200. The battery device 10 can further include other structures, for example, the battery device 10 can further include a busbar component for realizing electrical connection between the multiple battery cells 100.

[0055] The battery cell 100 can include, but is not limited to, a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc. The shape of the battery cell 100 can include, but is not limited to, a cylinder, a flat body, a cuboid, or other shapes, etc. The battery cell 100 can include, but is not limited to, a cylindrical battery cell 100, a square battery cell 100, a soft-pack battery cell 100, and a blade battery cell 100 according to the packaging manner. The battery cell 100 refers to the smallest unit that constitutes a battery. The battery cell 100 includes an end cover, a shell, an electrode assembly, and other functional components.

[0056] The end cover refers to a component that covers the opening of the shell to isolate the internal environment of the battery cell 100 from the external environment. Without limitation, the shape of the end cover can be adapted to the shape of the shell to fit the shell. Alternatively, the end cover can be made of a material with certain hardness and strength (such as aluminum alloy), so that the end cover is not easily deformed when subjected to extrusion and impact, so that the battery cell 100 can have higher structural strength, and the safety performance can also be improved. The end cover can be provided with functional components such as electrode terminals. The electrode terminals can be used to electrically connect with the electrode assembly for outputting or inputting the electrical energy of the battery cell 100. In some embodiments, the end cover can also be provided with a pressure relief mechanism for relieving the internal pressure of the battery cell 100 when the internal pressure or temperature of the battery cell 100 reaches a threshold value. The material of the end cover can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations. In some embodiments, an insulating piece can also be provided on the inner side of the end cover, which can be used to isolate the electrical connection components in the shell from the end cover to reduce the risk of short circuit. Exemplarily, the insulating piece can be plastic, rubber, etc.

[0057] The shell is a component for fitting the end cover to form an internal environment of the battery monomer 100, wherein the formed internal environment can be used to accommodate the battery cell assembly, the electrolyte and other components. The shell and the end cover can be independent components, and an opening can be provided on the shell. The end cover is fitted to cover the opening to form the internal environment of the battery monomer 100. Without limitation, the end cover and the shell can also be integrated. Specifically, the end cover and the shell can form a common connecting surface before other components enter the shell. When it is necessary to seal the internal environment of the shell, the end cover is fitted to cover the shell. The shell can be in various shapes and sizes, such as a cuboid, a cylinder, a hexagonal prism, etc. Specifically, the shape of the shell can be determined according to the specific shape and size of the battery cell assembly. The material of the shell can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations thereto.

[0058] The battery cell assembly is a component in which electrochemical reactions occur in the battery monomer 100. One or more battery cell assemblies can be contained in the shell. The battery cell assembly is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have a portion with active material constituting a main body of the battery cell assembly, and a portion without active material constituting a tab of the positive electrode sheet and the negative electrode sheet, respectively. The positive electrode tab and the negative electrode tab can be located at one end of the main body or at two ends of the main body, respectively. In the charging and discharging process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs are connected to the electrode terminal to form a current loop.

[0059] According to some embodiments of the present application, please refer to Figure 3 , and further refer to Figures 7 to 9 , the battery device 10 comprises a box body 200, an expansion beam 400, a battery monomer 100, an electric control assembly 300 and a connecting assembly 600. The box body 200 has a top wall 201 and a bottom wall 202, and the top wall 201 is provided with a recessed area 200a recessed towards the bottom wall 202. The expansion beam 400 is arranged in the box body 200 and divides the internal space of the box body 200 into a plurality of cavities 203. The recessed area 200a constitutes at least part of the top of part of the cavities 203, and the expansion beam 400 is provided with a first avoiding part 410 near the top wall 201. The first avoiding part 410 is arranged opposite to and spaced from the recessed area 200a. The battery monomer 100 is arranged in at least one cavity 203. The electric control assembly 300 is arranged in at least one cavity 203. The connecting assembly 600 is connected between the electric control assembly 300 and the battery monomer 100, and the connecting assembly 600 comprises a plurality of connecting pieces 610. At least part of the connecting pieces 610 passes between the first avoiding part 410 and the recessed area 200a.

[0060] The box 200 generally provides a housing space or mounting base for the battery monomer 100 and other components of the battery device 10. The box 200 can have various structures as described above, and the structure of the box 200 will not be described here. For ease of introduction, the battery device 10 with a square shell will be taken as an example. Generally, the box 200 has a plurality of walls, which generally include a top wall 201, a bottom wall 202, and side walls connected between the top wall 201 and the bottom wall 202. The top wall 201, the bottom wall 202, and the side walls enclose a housing space, which is also commonly referred to as the internal space of the box 200. In an example, referring to Figure 5 and Figure 6 , the box 200 includes a box body 210 and a box cover 220. Part of the box body 210 constitutes the bottom wall 202, and at least part of the box cover 220 constitutes the top wall 201. The box body 210 has a receiving groove 211, and the expansion beam 400 is arranged in the receiving groove 211 and divides the receiving groove 211 into a plurality of sub-groove bodies 211a. The box cover 220 covers the opening of the receiving groove 211 and is arranged in the plurality of sub-groove bodies 211a to form a plurality of cavities 203.

[0061] The expansion beam 400 refers to a structure in the battery device 10 for limiting the position of the battery monomer 100 and inhibiting the expansion of the battery monomer 100. The expansion beam 400 is a hollow beam structure. When the battery monomer 100 in the box 200 expands, the expansion beam 400 can deform moderately to follow the expansion and contraction of the battery monomer 100 due to its hollow interior. At the same time, the expansion beam 400 can offset the expansion force to some extent, thereby reducing the stress on the box 200 and playing a buffering role. Generally, the expansion beam 400 can be made of sheet metal or extruded profiles. The expansion beam 400 can be connected to the bottom wall 202, to two opposite side walls, or to at least one of the two opposite side walls and the bottom wall 202. The expansion beam 400 can be fixedly connected to the box 200 by welding, bonding, or the like, or can be detachably connected to the box 200 by screwing, clamping, or the like.

[0062] In the embodiments of the present application, the expansion beam 400 is arranged in the box 200 and divides the internal space of the box 200 into a plurality of cavities 203. That is, the expansion beam 400, together with the walls of the box 200, defines the plurality of cavities 203. The number of cavities 203 can be two, three, or more, and is generally determined by the number and mounting position of the expansion beam 400. The number of expansion beams 400 can be one, two, or more.

[0063] In an embodiment, as Figure 3 , Figure 6 and Figure 7As shown, the number of expansion beams 400 is one, and the two sides of the expansion beam 400 define a cavity 203 with the side wall of the box 200, at this time, the number of cavities 203 is two, one of the cavities 203 is provided with the battery monomer 100, and the other cavity 203 is provided with the electric control assembly 300, and the recessed area 200a is provided corresponding to one of the cavities 203, that is, one of the electric control assembly 300 and the battery monomer 100 is located between the bottom wall 202 and the recessed area 200a. In another embodiment, the number of expansion beams 400 is multiple, wherein the multiple expansion beams 400 can be arranged in sequence and spaced apart along the length direction of the box 200, or arranged in other directions; or part of the expansion beams 400 are located at both ends of the box 200, that is, arranged close to the side wall of the box 200, and part of the expansion beams 400 are arranged in the middle of the box 200; the arrangement mode of the expansion beams 400 needs to meet the requirement that the expansion beams 400 can separate the internal space of the box 200 into at least two cavities 203. The recessed area 200a constitutes part of the top of the cavity 203, that is, the part of the top wall 201 corresponding to the recessed area 200a constitutes part of the inner wall of the multiple cavities 203, which can also be called the "ceiling" of the cavity 203.

[0064] As described above, the battery monomer 100 is arranged in the box 200; wherein the multiple battery monomers 100 can be arranged in an array in the box 200, which is usually a rectangular array or a straight line array; taking a square cell as an example, the multiple battery monomers 100 are arranged in a straight line array in the box 200, in other words, the multiple battery monomers 100 are arranged in a spaced apart manner along the length extension direction or the width extension direction of the box 200; in another embodiment, the multiple battery monomers 100 are arranged in an array in the box 200.

[0065] The electric control assembly 300 refers to the device in the battery device 10 for monitoring the battery monomer 100 and controlling the charging and discharging of the battery monomer 100. The electric control assembly 300 can be a power distribution unit (PDU), can be a related component of a battery management system (BMS), or can include both the power distribution unit and the battery management system. The power distribution unit is the "power hub" of the battery pack, responsible for the distribution of high-voltage power, the on-off of the circuit, and the protection of the physical short circuit. The battery management system is the "intelligent brain", which monitors the state of the battery cell in real time, estimates the power, performs balance management, and issues instructions to ensure the safe and efficient operation of the battery, and the two work together to manage and control the battery monomer 100. Since the improvement does not involve the related components of the battery management system and the structure of the power distribution unit itself, it will not be described here.

[0066] Since the electric control assembly 300 refers to the device in the battery device 10 for monitoring the battery monomer 100 and controlling the charging and discharging of the battery monomer 100, the electric connection between the electric control assembly 300 and the battery monomer 100 is needed, which usually needs the physical connection 610, that is, the electric control assembly 300 and the battery monomer 100 are electrically connected through the connection 610; the connection 610 is used to realize the electric connection between the electric control assembly 300 and the battery monomer 100; since the number of the battery monomer 100 is usually multiple, and different types of electrical connections also need different connections 610, for example, strong and weak electrical connections, therefore, the connection 610 between the electric control assembly 300 and the battery monomer 100 is usually multiple, thereby, the multiple connections 610 are collectively referred to as the connection assembly 600.

[0067] In an example, the connection assembly 600 includes a busbar, a circuit board and a wire harness, wherein the busbar is connected with the electrode terminal of the battery monomer 100, the busbar and the circuit board are connected, the circuit board is connected with the electric control assembly 300 through the wire harness, and the connection between the busbar, the circuit board and the wire harness needs to realize the electric connection; in other embodiments, the circuit board is a flexible circuit board. Wherein, the number of the wire harness is usually large, and a fastener 620 similar to a tie or a clamp is usually used to fix the multiple wire harnesses to the expansion beam 400, usually to the avoiding part.

[0068] The battery monomer 100 is arranged in at least one cavity 203, and the electric control assembly 300 is arranged in at least one cavity 203; usually, the multiple cavities 203 separated by the expansion beam 400 can be divided into two parts, one part is used to accommodate the battery monomer 100, and the other part is used to accommodate the electric control assembly 300, since the recess area 200a constitutes the top of one of the cavities 203, that is, at least one of the battery monomer 100 and the electric control assembly 300 is located between the recess area 200a and the bottom wall 202. In this way, the connection 610 between the battery monomer 100 and the electric control assembly 300 needs to be arranged across the expansion beam 400.

[0069] The first avoiding part 410 is an avoiding structure arranged on the expansion beam 400, and is located at a position close to the top wall 201 of the box body 200. The avoiding structure can be an avoiding surface, an avoiding groove or other structures to provide an installation space for the connecting member 610. In the embodiment where the avoiding structure is an avoiding surface, the avoiding surface is generally an inclined surface, and in some embodiments, can also be an arc surface, etc. In the embodiment where the avoiding structure is an avoiding groove, the avoiding groove generally penetrates the expansion beam 400 along the direction from one cavity 203 to another cavity 203, and the groove opening of the avoiding groove is arranged towards the recessed area 200a. For example, the expansion beam 400 has opposite first and second sides, the battery monomer 100 is arranged on the first side of the expansion beam 400, and the electric control assembly 300 is arranged on the second side of the expansion beam 400, that is, the opposite two sides of the expansion beam 400 are respectively provided with cavities 203, the avoiding groove penetrates the expansion beam 400 along the direction from the first side to the second side, and the groove opening of the avoiding groove is arranged towards the recessed area 200a.

[0070] The technical scheme of the present application provides the first avoiding part 410 arranged at a position close to the top wall 201 of the expansion beam 400, and the first avoiding part 410 is arranged opposite and spaced apart from the recessed area 200a, so that the first avoiding part 410 of the expansion beam 400 and the recessed area 200a of the top wall 201 are configured as an avoiding space for installing at least part of the connecting member 610, thereby increasing the installation space of the part of the connecting member 610, reducing the friction between at least part of the connecting member 610 and the inner wall of the box body 200, and further reducing the electrical risk caused by the damage of the insulating layer of the connecting member 610 due to the friction.

[0071] In some embodiments, the distance between the first avoiding part 410 and the top wall 201 is not less than 10 mm; and / or, the distance between the first avoiding part 410 and the top wall 201 is not greater than 50 mm.

[0072] The distance between the first avoiding part 410 and the top wall 201 refers to the minimum distance between the first avoiding part 410 and the top wall 201, which includes d1 as shown in FIG. 2 and d2 as shown in FIG. 3. Figure 3 Figure 5 The distance between the first avoiding part 410 and the top wall 201 can be measured by measuring the size of the box body 200 and the expansion beam 400, constructing a three-dimensional model of the battery device 10 in computer drawing software, and reading the distance between the first avoiding part 410 and the top wall 201 by the drawing software; or by three-dimensional scanning, constructing a three-dimensional model of the battery device 10 in computer drawing software, and the detailed scanning steps are not described here.

[0073] ​The distance between the first avoiding part 410 and the top wall 201 is not less than 10 mm; and / or, the distance between the first avoiding part 410 and the top wall 201 is not greater than 50 mm, which can be that the distance between the first avoiding part 410 and the top wall 201 is not less than 10 mm, which can be that the distance between the first avoiding part 410 and the top wall 201 is not greater than 50 mm, which can be that the distance between the first avoiding part 410 and the top wall 201 is not less than 10 mm, and the distance between the first avoiding part 410 and the top wall 201 is not greater than 50 mm. Exemplarily, the distance between the first avoiding part 410 and the top wall 201 can be 10 mm, 12 mm, 15 mm, 18 mm, 20 mm, 22 mm, 24 mm, 25 mm, 28 mm, 30 mm, 32 mm, 36 mm, 38 mm, 40 mm, 42 mm, 44 mm, 45 mm, 48 mm or 50 mm, etc.

[0074] The distance between the first avoiding part 410 and the top wall 201 is not less than 10 mm, and the minimum distance of 10 mm is set to provide a relatively large physical avoiding space to realize the core function of reducing interference and reducing friction. The distance between the first avoiding part 410 and the top wall 201 is not greater than 50 mm, which is mainly to optimize the space, because too much avoiding may damage the integrity of the structure, and thus the supporting force of the battery monomer 100 is insufficient.

[0075] In the embodiment, by limiting the distance between the first avoiding part 410 and the top wall 201 within a certain value, the friction between the connecting piece 610 and the inner wall of the box body 200 is reduced, and the influence of the avoiding part on the structural strength of the expansion beam 400 is reduced.

[0076] In some embodiments, the side of the first avoiding part 410 opposite to the recessed area 200a is the first avoiding surface 411, and the first avoiding surface 411 is inclined to the bottom wall 202.

[0077] The expansion beam 400 can be provided with an avoiding part at the position close to the top wall 201 and close to the recessed area 200a, or part of the expansion beam 400 at the position close to the top wall 201 and close to the recessed area 200a can be provided with an avoiding part, and the proportion can be set according to the arrangement path of the connecting piece 610. The first avoiding surface 411 is inclined to the bottom wall 202, that is, the first avoiding surface 411 has a certain angle with the inner surface of the bottom wall 202, and the angle is usually greater than 90°.

[0078] Compared with the avoidance structure of setting the avoidance groove, the avoidance structure of the avoidance surface is adopted in the embodiment, the avoidance surface is easy to be made into a large round corner and add a cover, which can further reduce the wear on the connecting piece 610 or the sheath of the connecting piece 610; secondly, the connecting piece 610 does not need to be accurately “plugged into the groove”, which reduces the risk of misinstallation and pinch injury and makes the maintenance more convenient; in addition, the avoidance surface has the advantages of simple process, and the angle, position and gap of the inclined surface are easy to parameterize, which can adapt to different wiring schemes.

[0079] It can be understood that, since the expansion beam 400 is usually manufactured in the form of an extruded profile, if the size of the angle between the first avoidance surface 411 and the bottom wall 202 affects the size of the R angle of the inner cavity of the expansion beam 400, the angle between the first avoidance surface 411 and the bottom wall 202 should not be too large or too small, because the inner cavity of the expansion beam 400 is not easy to be formed if the R angle is too small. Based on this, in some embodiments, please refer to Figure 3 , the angle between the first avoidance surface 411 and the bottom wall 202 is not less than 105° and not more than 165°.

[0080] Wherein, the angle between the first avoidance surface 411 and the bottom wall 202 is ɑ1 as shown in Figure 3 , the value of ɑ1 includes but is not limited to 105°, 110°, 115°, 120°, 125°, 130°, 135°, 140°, 145°, 150°, 155°, 160° or 160°. It can be understood that the surface of the bottom wall 202 is usually relatively flat, at this time, the angle between the inner surface of the bottom wall 202 and the first avoidance surface 411 can be determined as the inclination angle of the first avoidance surface 411. In the case that there is local unevenness on the surface of the bottom wall 202, a reference plane is defined in a fitting manner, and the angle between the reference plane and the first avoidance surface 411 is determined as the inclination angle of the first avoidance surface 411; or the battery device 10 is placed on a horizontal desktop, and the inclination angle of the first avoidance surface 411 is determined by measuring the angle between the desktop and the first avoidance surface 411.

[0081] In the embodiment, the inclination angle of the first avoidance surface 411 is limited to between 105° and 165°, which can provide a certain avoidance space while reducing the influence on the forming of the expansion beam 400.

[0082] In some embodiments, please refer to Figures 3 to 5 , the top wall 201 includes a first segment 201a, a second segment 201b and a third segment 201c arranged in sequence along the first direction; the second segment 201b and the third segment 201c are arranged as a recessed area 200a, the second segment 201b is arranged obliquely relative to the first segment 201a, and the second segment 201b is arranged obliquely relative to the third segment 201c; the electric control assembly 300 is arranged between the third segment 201c and the bottom wall 202, and the battery monomer 100 is arranged between the first segment 201a and the bottom wall 202.

[0083] The first direction can be the length direction or the width direction of the box body 200, wherein, along the first direction, the part of the top wall 201 corresponding to the first section 201a is generally equal or close to equal to the distance from the bottom wall 202, and the part of the top wall 201 corresponding to the third section 201c is also generally equal or close to equal to the distance from the bottom wall 202; the second section 201b is arranged obliquely relative to the first section 201a, that is, the part of the top wall 201 corresponding to the second section 201b is arranged obliquely relative to the part of the top wall 201 corresponding to the first section 201a; the second section 201b is arranged obliquely relative to the third section 201c, that is, the part of the top wall 201 corresponding to the second section 201b is arranged obliquely relative to the part of the top wall 201 corresponding to the third section 201c. The second section 201b is arranged obliquely relative to the third section 201c, and the included angle between the second section 201b and the third section 201c is, as shown in Figure 3 The included angle a2 between the second section 201b and the third section 201c is not less than 105° and not more than 165°, and the value of a2 includes but is not limited to 105°, 110°, 115°, 120°, 125°, 130°, 135°, 140°, 145°, 150°, 155°, 160° or 160°. The measurement method of a2 can refer to that of a1, which will not be described here.

[0084] In the embodiment, the part of the top wall 201 corresponding to the second section 201b and the third section 201c is arranged as the recessed area 200a, the position of the recessed area 200a generally corresponds to the foot area 205 of the chassis of the vehicle 1, the rest part is generally the seating area, the foot area 205 is deepened, the foot angle is more natural, the leg support is better, and the seat H (H-point) point can be lowered or the head space can be increased without increasing the vehicle height; the inclined surface is adopted between the first section 201a and the third section 201c, so that the floor slope of the foot compartment is smooth, and the foot feeling is more comfortable; in addition, the space corresponding to the recessed area 200a is used to arrange the electric control assembly 300, and the utilization rate of the internal volume of the box body 200 is improved.

[0085] It can be understood that the seat H point refers to the geometric representative point of the hip joint of the occupant; in automotive engineering, after a standard anthropometric dummy (H-point Machine) is placed on a seat and a specified load is applied, the center position of the thigh and torso pivot of the dummy is the H point; the three-dimensional coordinates of the H point in the vehicle 1 sitting coordinate system are used as the reference of the sitting posture of the occupant.

[0086] In some embodiments, please refer to Figure 4The top wall 201 further comprises a fourth section 201d and a fifth section 201e, the first section 201a, the second section 201b, the third section 201c, the fourth section 201d and the fifth section 201e are sequentially connected along the first direction, and the second section 201b is oppositely arranged to the fourth section 201d; the fourth section 201d is oppositely arranged to the third section 201c, and the fourth section 201d is oppositely arranged to the fifth section 201e; the second section 201b, the third section 201c and the fourth section 201d are arranged as the concave area 200a; and the fifth section 201e and the bottom wall 202 are provided with the battery monomer 100.

[0087] In the embodiment, the high-thickness battery monomer 100 is arranged in the region of the first section 201a and the fifth section 201e, and the space corresponding to the concave area 200a is used to arrange the electric control assembly 300, so as to further improve the internal volume utilization rate of the box body 200; in addition, the top wall 201 is arranged in multiple sections along the first direction, and is arranged in a bending manner, so as to form a structure of alternating concave and inclined surface transition, thereby improving the structural strength of the top wall 201.

[0088] In some embodiments, referring to Figure 5 The expansion beam 400 is further provided with a support block 500 on the side close to the top wall 201; and the distance between the support block 500 and the top wall 201 is less than the distance between the first avoiding part 410 and the top wall 201 along the direction from the top wall 201 to the bottom wall 202.

[0089] The expansion beam 400 is usually provided with a cavity inside, and the support block 500 is usually a solid structure, of course, the support block 500 can also be a structure with a local cavity; in short, the structural strength of the support block 500 is greater than that of the expansion beam 400. The support block 500 is abutted with the top wall 201, or the support block 500 is connected with the top wall 201 through fastening components, so as to increase the anti-expansion capacity of the box body 200 to the battery monomer 100; for example, the support block 500 can be a trapezoidal solid block, the top of the support block 500 is a plane, a mounting hole 512 is arranged on the top surface of the support block 500, and the top wall 201 and the support block 500 are fastened and connected through a pin, a screw or a bolt.

[0090] In the embodiment, the first avoiding part 410 is usually arranged to avoid the wire harness, the busbar, the valve / ventilation part, the connector and the like, so as to increase the gap between the first avoiding part 410 and the top wall 201, so that the parts can be reduced or lightened in being extruded or abraded by the top wall 201 under the assembly tolerance, thermal expansion and contraction, collision / scraping or stacking load.

[0091] In some embodiments, referring to Figure 5The difference between the distance of the first avoiding part 410 from the top wall 201 and the distance of the support block 500 from the top wall 201 is not less than 5mm, and / or the difference between the distance of the first avoiding part 410 from the top wall 201 and the distance of the support block 500 from the top wall 201 is not more than 30mm.

[0092] The difference between the distance of the first avoiding part 410 from the top wall 201 and the distance of the support block 500 from the top wall 201 is not less than 5mm, and / or the difference between the distance of the first avoiding part 410 from the top wall 201 and the distance of the support block 500 from the top wall 201 is not more than 30mm. Figure 5 The difference between the distance of the first avoiding part 410 from the top wall 201 and the distance of the support block 500 from the top wall 201 is not less than 5mm, and / or the difference between the distance of the first avoiding part 410 from the top wall 201 and the distance of the support block 500 from the top wall 201 is not more than 30mm.

[0093] Generally, the support block 500 is installed on the installation groove 420 on the side of the expansion beam 400 close to the top wall 201 of the box body 200, and then the support block 500 is fixed on the expansion beam 400 by welding. In order to obtain a certain avoiding space and improve the welding strength of the welding position of the support block 500 and the expansion beam 400, the difference between the distance of the first avoiding part 410 from the top wall 201 and the distance of the support block 500 from the top wall 201 is not less than 5mm, that is, the height of the support block 500 protruding from the first avoiding part 410 in the direction from the bottom wall 202 to the top wall 201 is not less than 5mm. Of course, the difference between the distance of the first avoiding part 410 from the top wall 201 and the distance of the support block 500 from the top wall 201 cannot be too large, otherwise it will affect the supporting area of the expansion beam 400 on the battery monomer 100, and further affect the ability of the box body 200 to resist the expansion of the battery monomer 100. The embodiment can improve the welding strength of the welding position of the support block 500 and the expansion beam 400.

[0094] In some embodiments, please refer to Figure 6The number of the support blocks 500 is multiple, and the multiple support blocks 500 are arranged at intervals along the length direction of the expansion beam 400.

[0095] The number of the support blocks 500 can be two, three, four, five, six or more, and the number of the support blocks 500 is usually determined according to the length of the expansion beam 400; the multiple support blocks 500 are arranged at intervals along the length direction of the expansion beam 400, which can be arranged at uniform intervals or not at uniform intervals.

[0096] Compared with a single support block 500, the multiple support blocks 500 arranged at intervals along the length direction of the expansion beam 400 in the embodiment can disperse the sagging of the top wall 201 to multiple bearing points, reduce the single-point peak stress and local bending, and improve the anti-sagging capability of the top wall 201 of the box body 200.

[0097] In some embodiments, referring to Figure 5 and Figure 6 the support block 500 has multiple side surfaces, and adjacent side surfaces are connected through a round corner; or the battery device 10 further includes a buffer member, and the buffer member is wrapped around the circumferential side of the support block 500.

[0098] The adjacent side surfaces are connected through a round corner, that is, the edges of the support block 500 are provided with a round corner; the buffer member is usually a component such as foam or rubber, and the buffer member is wrapped around the circumferential side of the support block 500; in the above two schemes, the round corner can eliminate sharp edges, and the buffer member can provide a flexible interface, thereby changing the "sharp hard contact" into "smooth / soft contact", and cooperating with a reasonable gap, the risk of scratching the connecting member 610 by the edges of the support block 500 can be further reduced, and the round corner connection at the connecting position of the two side surfaces facing the recessed area 200a can reduce the damage of the box body 200 caused by the contact friction between the support block 500 and the top wall 201 during vibration.

[0099] In some embodiments, referring to 5, the side of the support block 500 close to the top wall 201 is provided with a second avoiding part 510, and the second avoiding part 510 is arranged opposite and at an interval from the recessed area 200a.

[0100] The second avoiding part 510 is usually an avoiding surface, which can be an inclined surface, an arc surface or a spherical surface, etc., and the side of the support block 500 close to the top wall 201 is provided with the second avoiding part 510, which is equivalent to increasing the distance between the recessed area 200a and the support block 500, so that the damage of the box body 200 caused by the contact friction between the support block 500 and the top wall 201 during vibration can be further reduced.

[0101] In some embodiments, the side of the second avoiding part 510 facing the recessed area 200a is a second avoiding surface 511, and the second avoiding surface 511 is arranged at an inclination relative to the bottom wall 202.

[0102] In the embodiment, the support block 500 is arranged as a chamfer close to the edge of the recessed area 200a, the area of the chamfer surface is expanded to configure the second avoiding surface 511, in this way, the distance between the support block 500 and the recessed area 200a can be increased, and the damage of the box 200 caused by the contact and friction of the support block 500 with the top during vibration is further reduced.

[0103] The application also provides a battery device 10, which is used for providing electric energy. The specific structure of the battery device 10 is referred to the above embodiments. Since the electric equipment adopts all the technical solutions of the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, which will not be repeated here.

[0104] In some embodiments, the electric equipment is a vehicle 1, the vehicle 1 includes a vehicle body, and the battery device 10 is arranged on the vehicle body; the vehicle body has a length direction and a width direction; the top wall 201 of the box 200 is provided with a first seat area 204, a foot area 205 and a second seat area 206 arranged in sequence along the length direction, the first seat area 204, the foot area 205 and the second seat area 206 are arranged along the width direction respectively, and the recessed area 200a is arranged as the foot area 205.

[0105] In the embodiment, the foot area 205 is arranged as a downward recess, the ankle / knee angle of the occupant is more natural, and the foot feeling is better; under the premise of not raising the roof, the H point of the front and rear seats is allowed to be optimized or reduced, the head space is released or the whole vehicle posture is reduced. The high-thickness battery monomer 100 is arranged in the first seat area 204 and the second seat area 206, and the battery monomer 100 is cancelled in the foot area 205, and the electric control assembly 300 is arranged, which meets the needs of the foot cabin and reduces the overall thinning of the battery device 10 for the foot cabin, and improves the overall volume energy density.

[0106] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the application, but not to limit them; although the application has been described in detail with reference to the above embodiments, those skilled in the art should understand that: they can still modify the technical solutions recorded in the above embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application, and they should be covered in the scope of the claims and the description of the application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized by, The battery device comprises: a box body having a top wall and a bottom wall, the top wall being provided with a recessed area recessed towards the bottom wall; an expansion beam arranged in the box body and separating the internal space of the box body into multiple cavities, the recessed area constituting the top of part of the cavities, the expansion beam being provided with a first avoiding portion near the top wall, the first avoiding portion being arranged opposite and spaced apart from the recessed area; a battery cell arranged in at least one of the cavities; an electronic control assembly arranged in at least one of the cavities; and a connecting assembly connected between the electronic control assembly and the battery cell, the connecting assembly comprising multiple connecting members, at least part of the connecting members being arranged between the first avoiding portion and the recessed area. The distance between the first avoiding portion and the top wall is not less than 10 mm; 2. The battery device of claim 1, wherein and / or, the distance between the first avoiding portion and the top wall is not greater than 50 mm. The side of the first avoiding portion opposite the recessed area is a first avoiding surface, the first avoiding surface being arranged obliquely relative to the bottom wall.

3. The battery device of claim 1, wherein The angle between the first avoiding surface and the bottom wall is not less than 105°; 4. The battery device of claim 3, wherein and / or, the angle between the first avoiding surface and the bottom wall is not greater than 165°. The top wall comprises a first segment, a second segment and a third segment arranged in sequence along a first direction; 5. The battery device according to any one of claims 1 to 4, wherein The second segment and the third segment are arranged as the recessed area, the second segment being arranged obliquely relative to the first segment, and the second segment being arranged obliquely relative to the third segment; The third segment and the bottom wall are provided with the electronic control assembly, and the first segment and the bottom wall are provided with the battery cell. The top wall further comprises a fourth segment and a fifth segment, the first segment, the second segment, the third segment, the fourth segment and the fifth segment being connected in sequence along the first direction, the second segment being arranged opposite the fourth segment, the fourth segment being arranged obliquely relative to the third segment, and the fourth segment being arranged obliquely relative to the fifth segment; 6. The battery device of claim 5, wherein The second segment, the third segment and the fourth segment are arranged as the recessed area, and the fifth segment and the bottom wall are provided with the battery cell. The expansion beam further comprises a support block near the top wall; 7. The battery device according to any one of claims 1 to 4, wherein In the direction from the top wall to the bottom wall, the distance between the support block and the top wall is less than the distance between the first avoiding portion and the top wall. The difference between the distance between the first avoiding portion and the top wall and the distance between the support block and the top wall is not less than 5 mm, and / or the difference between the distance between the first avoiding portion and the top wall and the distance between the support block and the top wall is not greater than 30 mm.

8. The battery device of claim 7, wherein The number of the support blocks is multiple, and the multiple support blocks are arranged in sequence along the length direction of the expansion beam.

9. The battery device of claim 7, wherein The support block has multiple side surfaces, and adjacent side surfaces are connected by a rounded corner.

10. The battery device of claim 7, wherein Alternatively, the battery device further comprises a buffer member, the buffer member being wrapped around the side of the support block. The support block is provided with a second avoiding portion near the top wall, the second avoiding portion being arranged opposite and spaced apart from the recessed area.

11. The battery device of claim 7, wherein The side of the second avoiding portion facing the recessed area is a second avoiding surface, the second avoiding surface being arranged obliquely relative to the bottom wall.

12. The battery device of claim 11, wherein, ​ 13. The battery device according to any one of claims 1 to 4, wherein The box comprises a box body and a box cover; part of the box body constitutes the bottom wall, and at least part of the box cover constitutes the top wall; The box body has a containing groove, the expansion beam is arranged in the containing groove, and the containing groove is divided into a plurality of sub-groove bodies by the expansion beam; the box cover is arranged at the groove opening of the containing groove and is arranged in a surrounding manner with the plurality of sub-groove bodies to form a plurality of cavities.

14. An electrical device, characterized by The electric device comprises the battery device as claimed in any one of claims 1 to 13, and the battery device is used to provide electric energy.

15. The powered device of claim 14, wherein, The electric device is a vehicle, the vehicle comprises a vehicle body, and the battery device is arranged in the vehicle body; the vehicle body has a length direction and a width direction. The top wall of the box is provided with a first seating area, a foot area and a second seating area arranged in sequence along the length direction, the first seating area, the foot area and the second seating area are respectively arranged along the width direction, and the recessed area is arranged as the foot area.

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