Battery device and electric device

Abstract

The utility model provides a battery device and an electric device. The battery device comprises a box body, a battery monomer assembly and a buffer piece, the battery monomer assembly is arranged in the box body, the battery monomer assembly comprises a battery monomer, and the battery monomer comprises two side walls which are oppositely arranged along a first direction; the buffer piece is arranged in the box body, the battery monomer assembly and the buffer piece are arranged in the first direction, and the buffer piece comprises a buffer space. Wherein in the first direction, the middle area of the side wall corresponds to the buffering space, the buffering space is arranged close to the side wall, the buffering space comprises a buffering concave part, the buffering concave part comprises an opening, and the opening faces the side wall.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of battery, in particular to a battery device and a power utilization device. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery device technology is an important factor for its development. In the development of battery device technology, how to improve the safety of battery device has always been a research direction in battery device technology. CONTENT OF THE INVENTION

[0003] In view of the above problems, the present application provides a battery device and a power utilization device, which is beneficial to improve the safety of the battery device.

[0004] The present application provides a battery device, which comprises a box body, a battery monomer assembly and a buffer. The battery monomer assembly is arranged in the box body, and the battery monomer assembly comprises a battery monomer, and the battery monomer comprises two side walls arranged opposite along a first direction. The buffer is arranged in the box body, and the battery monomer assembly and the buffer are arranged along the first direction, and the buffer comprises a buffer space. Wherein, along the first direction, the middle region of the side wall is arranged corresponding to the buffer space, and the buffer space is arranged close to the side wall, and the buffer space comprises a buffer recess, and the buffer recess comprises an opening, and the opening faces the side wall.

[0005] The battery device of the present application comprises a battery monomer assembly and a buffer. The battery monomer assembly and the buffer are arranged along a first direction. When the battery monomer expands, the side wall will expand and deform in the first direction, so that the battery monomer assembly expands in the first direction. The buffer space of the buffer is arranged corresponding to the middle region of the side wall. When the side wall expands and deforms, the buffer space of the buffer can buffer and release the expansion force of the middle region of the side wall, reduce the force applied by the side wall to the buffer, reduce the deformation amount of the buffer, and reduce the possibility of stress concentration of the buffer. The buffer can provide limiting support to the edge region of the side wall close to the end cover, so that the edge region of the side wall is limited, the deformation amount of the edge region of the side wall is reduced, the end cover and the shell are subjected to a relatively small pulling force, the structural stress of the connection region of the end cover and the shell can be kept relatively stable, the possibility of connection failure is reduced, and the safety of the battery monomer and the battery device is improved.

[0006] When the side wall expands, the buffer member limits and constrains the middle region of the side wall to a smaller extent in the area of the buffer space, so that the middle region of the side wall can expand, reducing the possibility of excessive pressure in the battery monomer due to the failure of the side wall to expand. When the side wall expands and deforms, the volume of the buffer space can be compressed to effectively release the expansion force of the middle region of the side wall, reducing the extrusion stress of the side wall on the buffer member.

[0007] In some possible implementations, the buffer space is arranged through the buffer member in the second direction, and the first direction is perpendicular to the second direction.

[0008] When the battery monomer assembly and the buffer member are assembled, the battery monomer assembly can be relatively easily arranged such that the middle region of the side wall corresponds to the buffer space, reducing the assembly difficulty of the battery monomer assembly and the buffer member, and facilitating the improvement of assembly efficiency.

[0009] In some possible implementations, the buffer member is arranged on the opposite sides of the battery monomer assembly in the first direction.

[0010] When the battery monomer assembly expands, the battery monomer assembly simultaneously expands and deforms in the first direction. The buffer members arranged on the opposite sides of the battery monomer assembly can simultaneously buffer and release the expansion force, which is conducive to further buffering and releasing the expansion force of the middle region of the side wall and reducing the force exerted by the side wall on the buffer member.

[0011] In some possible implementations, the buffer member is any one of a limiting beam and an end plate.

[0012] In some possible implementations, the battery device further includes an elastic insulating member, the buffer member is connected to the box body, and the elastic insulating member is arranged between the buffer member and the side wall.

[0013] The elastic insulating member isolates the buffer member and the battery monomer assembly, improving the safety of the battery device. When the side wall expands, the middle region of the side wall can exert an expansion force on the elastic insulating member, so that the elastic insulating member can deform. The buffer space of the buffer member and the elastic insulating member can be used together to buffer and release the expansion force of the middle region of the side wall, reduce the force exerted by the side wall on the buffer member, and reduce the deformation amount of the buffer member.

[0014] The battery device provided in the application comprises a box body, a battery cell assembly and a buffer. The battery cell assembly is arranged in the box body, and comprises battery cells, which comprise two side walls arranged oppositely along a first direction. The buffer is arranged in the box body, and the battery cell assembly and the buffer are arranged along the first direction. The buffer comprises a buffer space. The middle region of the side wall is arranged corresponding to the buffer space along the first direction, and the buffer space is arranged close to the side wall. The buffer comprises two side plates arranged oppositely along the first direction and a plurality of first protruding ribs arranged along a third direction. The middle region of one of the two side plates is arranged with the plurality of first protruding ribs, and the other is arranged with the plurality of first protruding ribs along the first direction to form the buffer space. The first direction is perpendicular to the third direction.

[0015] In some possible implementation manners, the buffer space is arranged through the buffer along a second direction. The first direction, the second direction and the third direction are perpendicular to each other.

[0016] When the battery cell assembly and the buffer are assembled, the middle region of the side wall can be arranged corresponding to the buffer space relatively easily, which reduces the difficulty of assembling the battery cell assembly and the buffer, and is beneficial to improving the assembly efficiency.

[0017] In some possible implementation manners, the buffer is arranged on the opposite sides of the battery cell assembly along the first direction.

[0018] When the battery cell assembly is expanded, the battery cell assembly is simultaneously expanded and deformed to the two sides along the first direction. The buffers arranged on the opposite sides of the battery cell assembly can simultaneously buffer and release the expansion force of the battery cell assembly, which is beneficial to further buffering and releasing the expansion force of the middle region of the side wall, and reducing the force applied by the side wall to the buffer.

[0019] In some possible implementation manners, the battery device further comprises a limiting member, which is connected with the box body. The battery cell assembly and the limiting member are arranged along the first direction, and the buffer is arranged between the limiting member and the battery cell assembly.

[0020] When the side wall is expanded and deformed, the buffer space of the buffer can buffer and release the expansion force of the middle region of the side wall, reduce the force applied by the side wall to the limiting member, reduce the deformation amount of the limiting member, reduce the possibility of stress concentration of the limiting member, reduce the possibility of bending, deformation or fracture of the end connecting region of the limiting member caused by stress concentration, improve the structural stability of the limiting member itself and the connection stability between the limiting member and the box body.

[0021] In some possible implementation manners, the buffer is an insulating pad.

[0022] When the side wall is deformed by expansion, the buffer space of the insulating pad can buffer the expansion force of the middle region of the side wall, reduce the force applied by the side wall to the insulating pad, and reduce the force applied by the side wall to the limiting piece.

[0023] In some possible implementation manners, the buffer piece includes two side plates opposite in the first direction, and the buffer piece further includes a plurality of second protruding ribs arranged at intervals in the third direction, and the two side plates are connected with the second protruding ribs respectively.

[0024] The second protruding ribs are arranged in this way, which is beneficial to improving the structural strength of the buffer piece and improving the impact resistance of the buffer piece.

[0025] The battery device is used to provide electric energy. BRIEF DESCRIPTION OF DRAWINGS

[0026] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not intended to limit the scope of the present application. Moreover, like reference numerals designate like parts throughout the several views. In the drawings:

[0027] Figure 1 is a structural schematic diagram of a vehicle provided by an embodiment of the present application;

[0028] Figure 2 is a partial structural schematic diagram of a battery device provided by an embodiment of the present application;

[0029] Figure 3 is a structural schematic diagram of a battery monomer assembly provided by an embodiment of the present application;

[0030] Figure 4 is a partial structural schematic diagram of a battery monomer provided by an embodiment of the present application;

[0031] Figure 5 is a partial structural schematic diagram of a battery device provided by an embodiment of the present application;

[0032] Figure 6 is a partial structural schematic diagram of a battery device provided by an embodiment of the present application;

[0033] Figure 7 is a partial structural schematic diagram of a battery device provided by an embodiment of the present application;

[0034] Figure 8 is a structural schematic diagram of a buffer piece provided by an embodiment of the present application;

[0035] Figure 9is a partial structure schematic diagram of a battery device provided by an embodiment of the present application;

[0036] Figure 10 is a structure schematic diagram of a buffer provided by an embodiment of the present application;

[0037] Figure 11 is a partial structure schematic diagram of a battery device provided by an embodiment of the present application;

[0038] Figure 12 is a structure schematic diagram of a buffer provided by an embodiment of the present application;

[0039] Figure 13 is Figure 11 is an enlarged schematic diagram at M in FIG. 8.

[0040] Explanation of Reference Signs:

[0041] 1, vehicle; 10, battery device; 10a, box; 10b, first box part; 10c, second box part;

[0042] 11, controller; 12, motor;

[0043] 20, battery cell assembly;

[0044] 30, battery cell;

[0045] 40, end cover; 41, electrode terminal;

[0046] 50, housing; 51, side wall;

[0047] 60, electrode assembly; 601, large face; 602, narrow face;

[0048] 70, buffer; 71, buffer space; 711, opening; 72, through hole; 73, first protruding rib; 74, side plate; 75, second protruding rib;

[0049] 80, elastic insulating member;

[0050] 90, limiting member;

[0051] X, first direction;

[0052] Y, second direction;

[0053] Z, third direction. DETAILED DESCRIPTION

[0054] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying 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.

[0055] It should be noted that the technical terms or scientific terms used in the embodiments of the present application should be understood as the general meaning understood by the skilled in the art to which the embodiments of the present application belong, unless otherwise specified.

[0056] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0057] In addition, the technical terms "first", "second" and the like are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0058] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "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.

[0059] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or it can only mean that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or it can only mean that the horizontal height of the first feature is less than that of the second feature.

[0060] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of the application areas of battery devices, the market demand is also constantly increasing.

[0061] In this application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., and the embodiments of this application are not limited thereto. The battery cell may be flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited thereto.

[0062] The battery device mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. The battery device mentioned in this application can be a battery pack. For example, the battery device mentioned in this application can include battery cell assemblies, etc. A battery device generally includes a housing for encapsulating one or more battery cells. The housing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0063] A battery cell includes an end cap, a housing, and an electrode assembly. The electrode assembly is housed within the housing. The end cap is fixedly connected to the housing. The housing of the battery cell includes two opposing sidewalls. The electrode assembly includes a large surface and a narrow surface. The large surface of the electrode assembly faces the sidewall. During battery cell use (e.g., charging and discharging), the large surface of the electrode assembly may expand. When the electrode assembly expands, it exerts a force on the sidewall, potentially causing the sidewall to bulge outward. The bulge is more pronounced in the central area of ​​the sidewall than at the edges; that is, the closer to the center of the sidewall, the greater the bulge and the more obvious the swelling. The connection area between the end cap and the housing is a connection risk point. When the sidewall expands and deforms, it pulls on the connection area, causing a decrease in structural stress and potentially leading to connection failure, thus affecting the safety of the battery cell and the battery assembly.

[0064] To alleviate the safety issues of individual battery cells, a buffer structure can be set in the middle area of ​​the corresponding sidewall. When the sidewall expands and deforms, the expansion and deformation in the middle area can be released, while the edge area of ​​the sidewall near the end cap is restricted, reducing deformation. This keeps the structural stress in the connection area between the end cap and the casing stable, reduces the possibility of connection failure, and improves the safety of the individual battery cells and battery devices.

[0065] Based on the above considerations, and to alleviate the safety issues of individual battery cells within the casing, the inventors, after in-depth research, designed a battery device. This battery device includes a buffer component. The buffer component comprises a buffer space, with a central region of the sidewall connected to the buffer space. When the sidewall expands and deforms, the volume of the buffer space can be compressed to effectively release the expansion force in the central region of the sidewall. This reduces the compressive stress on the buffer component while allowing the sidewall to expand. Simultaneously, the buffer component provides limiting support to the edge region of the sidewall, restricting deformation near the end cap and stabilizing the structural stress at the connection area between the end cap and the casing. This reduces the possibility of connection failure and improves the safety of the individual battery cells and the battery device.

[0066] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.

[0067] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles. Spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. This application does not impose any special limitations on the above-mentioned electrical devices.

[0068] It should be understood that the technical solutions described in the embodiments of this application are not limited to the battery devices and electrical devices described above, but can also be applied to all battery devices including housings and electrical devices using battery devices. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0069] See Figure 1 As shown, vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 10 is installed inside vehicle 1. The battery device 10 can be located at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1. For example, the battery device 10 can serve as the operating power source for vehicle 1. Vehicle 1 may also include a controller 11 and a motor 12. The controller 11 is used to control the battery device 10 to supply power to the motor 12. For example, this is for the power needs of vehicle 1 during starting, navigation, and driving.

[0070] In some embodiments of this application, the battery device 10 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1.

[0071] To meet different power demands, the battery device 10 may include multiple battery cells. A battery cell is the smallest unit that makes up a battery cell assembly or battery pack. Multiple battery cells can be connected in series and / or in parallel via electrode terminals for various applications. The battery device mentioned in this application includes battery cell assemblies or battery packs. Multiple battery cells can be connected in series, in parallel, or in a mixed configuration. A mixed configuration refers to a combination of series and parallel connections. In the embodiments of this application, multiple battery cells can be directly assembled into a battery pack, or they can first be assembled into battery cell assemblies, and then the battery cell assemblies can be assembled into a battery pack.

[0072] See Figure 2 As shown, the battery device 10 includes a housing 10a and individual battery cells (not shown). The individual battery cells are housed within the housing 10a.

[0073] The housing 10a can be a simple three-dimensional structure such as a single cuboid, cylinder, or sphere, or it can be a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders, or spheres. This application embodiment does not limit this. The material of the housing 10a can be an alloy material such as aluminum alloy or iron alloy, or a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin. This application embodiment also does not limit this.

[0074] The housing 10a is used to accommodate individual battery cells, and the housing 10a can have various structures. In some embodiments, the housing 10a may include a first housing portion 10b and a second housing portion 10c. The first housing portion 10b and the second housing portion 10c overlap each other. The first housing portion 10b and the second housing portion 10c together define a receiving space for accommodating the individual battery cells. The second housing portion 10c may be a hollow structure with one open end. In some embodiments, the first housing portion 10b is a plate-like structure. The first housing portion 10b overlaps the open side of the second housing portion 10c to form a housing 10a with a receiving space. In some embodiments, both the first housing portion 10b and the second housing portion 10c may also be hollow structures with one open side. The open side of the first housing portion 10b overlaps the open side of the second housing portion 10c to form a housing 10a with a receiving space. Of course, the first housing portion 10b and the second housing portion 10c can have various shapes, such as cylinders, cuboids, etc.

[0075] To improve the sealing performance after the first housing part 10b and the second housing part 10c are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 10b and the second housing part 10c.

[0076] In some embodiments, the first housing portion 10b covers the top of the second housing portion 10c. The first housing portion 10b may also be referred to as the upper housing cover, and the second housing portion 10c may also be referred to as the lower housing.

[0077] In the battery device 10, there can be one or more battery cells. When there are multiple battery cells, they can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells are connected in both series and parallel. Multiple battery cells can be directly connected in series, parallel, or in a mixed configuration and then housed within the housing 10a. Alternatively, multiple battery cells can first be connected in series, parallel, or in a mixed configuration to form a battery cell assembly. The multiple battery cell assemblies can then be connected in series, parallel, or in a mixed configuration to form a whole and housed within the housing 10a.

[0078] In some embodiments, see Figure 3 As shown, there can be multiple battery cells 30. Multiple battery cells 30 are first connected in series, parallel, or in a mixed manner to form a battery cell assembly 20. Multiple battery cell assemblies 20 are then connected in series, parallel, or in a mixed manner to form a whole, which is housed within the casing 10a.

[0079] Multiple battery cells 30 in the battery cell assembly 20 can be electrically connected through a busbar component to achieve parallel, series, or mixed connection of multiple battery cells 30 in the battery cell assembly 20.

[0080] In this embodiment, the battery cell 30 may include a lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., and this embodiment is not limited thereto. The battery cell 30 may be flat, cuboid, or other shapes, and this embodiment is not limited thereto either. However, for the sake of brevity, the following embodiment uses a cuboid battery cell 30 as an example for illustration.

[0081] Battery cell 30 refers to the smallest unit that makes up battery device 10. See also Figure 4 As shown, the battery cell 30 includes an end cap 40, a housing 50, and an electrode assembly 60.

[0082] End cap 40 refers to a component that covers the opening of housing 50 to isolate the internal environment of battery cell 30 from the external environment. Exemplarily, the shape of end cap 40 can be adapted to the shape of housing 50 to fit the housing 50. Exemplarily, end cap 40 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that end cap 40 is not easily deformed under compression or impact, enabling battery cell 30 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 41 can be provided on end cap 40. Electrode terminals 41 can be used for electrical connection with electrode assembly 60 to output or input electrical energy to battery cell 30.

[0083] In some embodiments, the end cap 40 may also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 30 reaches a threshold. The end cap 40 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating component may also be provided on the inner side of the end cap 40. The insulating component can be used to isolate the electrical connection components within the housing 50 from the end cap 40 to reduce the risk of short circuits. Exemplarily, the insulating component can be plastic, rubber, etc.

[0084] The housing 50 is a component used to cooperate with the end cap 40 to form the internal environment of the battery cell 30. The formed internal environment can accommodate the electrode assembly 60 and other components. The housing 50 and the end cap 40 can be independent components. An opening can be provided on the housing 50, and the end cap 40 closes the opening to form the internal environment of the battery cell 30. Exemplarily, the housing 50 and the end cap 40 can be welded together. Alternatively, the end cap 40 and the housing 50 can be integrated. Specifically, the end cap 40 and the housing 50 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 50, the end cap 40 closes the housing 50. The housing 50 can be of various shapes and sizes, such as cuboid, hexagonal prism, etc. Specifically, the shape of the housing 50 can be determined according to the specific shape and size of the electrode assembly 60. The material of the housing 50 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment does not impose any special limitations on this.

[0085] Electrode assembly 60 is the component in the battery cell 30 where electrochemical reactions occur. The housing 50 may contain one or more electrode assemblies 60. Electrode assembly 60 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly. The portions of the positive and negative electrode sheets without active material each constitute a tab (not shown in the figure). The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs connect the electrode terminals to form a current loop.

[0086] See Figure 4 , Figure 5 and Figure 6 As shown, this application embodiment provides a battery device 10, which includes a housing 10a, a battery cell assembly 20, and a buffer 70. The battery cell assembly 20 is disposed within the housing 10a and includes a battery cell 30. The battery cell 30 includes two sidewalls 51 disposed opposite to each other along a first direction X. The buffer 70 is disposed within the housing 10a, and the battery cell assembly 20 and the buffer 70 are arranged along the first direction X. The buffer 70 includes a buffer space 71. Along the first direction X, the middle region of the sidewall 51 corresponds to the buffer space 71, and the buffer space 71 is disposed close to the sidewall 51.

[0087] When the battery cell 30 expands, the sidewall 51 will expand and deform in the first direction X. During this expansion and deformation, the middle region of the sidewall 51 bulges relatively more. Under the compression of the middle region of the sidewall 51, the volume of the buffer space 71 of the buffer member 70 can be relatively reduced to buffer and release the expansion force of the middle region of the sidewall 51, reduce the force exerted by the sidewall 51 on the buffer member 70, and reduce the deformation of the buffer member 70. The buffer member 70 can provide limiting support for the edge region of the sidewall 51, thus restricting the edge region of the sidewall 51 near the end cap 40 and reducing the deformation of the edge region of the sidewall 51.

[0088] In some possible implementations, the battery cell assembly 20 includes a plurality of battery cells 30. The plurality of battery cells 30 are arranged along a first direction X.

[0089] In some feasible implementations, multiple battery cell assemblies 20 can be arranged within the housing 10a. The multiple battery cell assemblies 20 are arranged along a second direction Y, where the first direction X is perpendicular to the second direction Y.

[0090] In some possible implementations, the battery cell 30 includes a housing 50. The housing 50 includes sidewalls 51. The housing 50 is cuboid in shape.

[0091] In some possible implementations, the electrode assembly 60 includes a large surface 601 and a narrow surface 602. The large surface 601 of the electrode assembly 60 is disposed facing the sidewall 51.

[0092] The battery device 10 of this embodiment includes a battery cell assembly 20 and a buffer member 70. The battery cell assembly 20 and the buffer member 70 are arranged along a first direction X. When the battery cell 30 expands, the sidewall 51 expands and deforms in the first direction X, causing the battery cell assembly 20 to expand in the first direction X. The buffer space 71 of the buffer member 70 is correspondingly disposed to the middle region of the sidewall 51. When the sidewall 51 expands and deforms, the buffer space 71 of the buffer member 70 can buffer and release the expansion force of the middle region of the sidewall 51, reduce the force exerted by the sidewall 51 on the buffer member 70, reduce the deformation of the buffer member 70, and reduce the possibility of stress concentration in the buffer member 70. The buffer 70 can provide limiting support for the edge area of ​​the side wall 51 near the end cap 40, thereby restricting the edge area of ​​the side wall 51, reducing the deformation of the edge area of ​​the side wall 51, and making the end cap 40 and the housing 50 subject to relatively small tensile force. The structural stress in the connection area between the end cap 40 and the housing 50 can remain relatively stable, reducing the possibility of connection failure and improving the safety of the battery cell 30 and the battery device 10.

[0093] The buffer space 71 provided on the buffer member 70 can effectively absorb the bulging deformation of the middle region generated by the battery cell 30 during the expansion process, reduce the squeezing force of the battery cell 30 on the buffer member 70, reduce the structural stress of the buffer member 70 itself, and reduce the possibility of deformation or failure of the buffer member 70. At the same time, it can also reduce the possibility of structural failure of the casing 10a due to the cumulative effect of expansion force, which is conducive to the normal operation of the battery device 10. The buffer member 70 can effectively disperse and absorb the expansion force, improving the safety of the battery device 10.

[0094] The higher the energy density of the battery device 10, the greater the expansion force of the battery cell assembly 20. The battery device 10 in this embodiment includes a buffer 70, which enables the battery device 10 to adapt to the product requirements of high energy density, and enables the battery device 10 to maintain stability and reliability under high energy density.

[0095] See also some of the possible implementation methods. Figure 7 and Figure 8 As shown, the buffer space 71 of the buffer member 70 includes a buffer recess, the buffer recess including an opening 711 facing the sidewall 51. Along the first direction X, the buffer space 71 is disposed close to the battery cell assembly 20.

[0096] When the sidewall 51 expands, the buffer 70 exerts less constraint on the middle region of the sidewall 51 within the buffer space 71, allowing the middle region of the sidewall 51 to expand. This reduces the possibility of excessive pressure inside the battery cell 30 due to the sidewall 51 failing to expand. When the sidewall 51 expands and deforms, the volume of the buffer space 71 can be compressed to effectively release the expansion force in the middle region of the sidewall 51, reducing the compressive stress of the sidewall 51 on the buffer 70.

[0097] Along the third direction Z, the portions of the buffer member 70 located on both sides of the buffer space 71 can provide limiting support for the edge region of the side wall 51, thereby restricting the edge region of the side wall 51 near the end cap 40, reducing the deformation of the edge region of the side wall 51, and keeping the structural stress of the connection area between the end cap 40 and the housing 50 stable, reducing the possibility of connection failure. The first direction X, the second direction Y, and the third direction Z are all perpendicular to each other.

[0098] In some examples, the cross-sectional shape of the buffer recess can be arc-shaped, trapezoidal, V-shaped, or U-shaped. In the embodiments of this application, the cross-sectional shape of the buffer recess is not specifically limited, and the specific shape can be designed according to structural requirements and the expansion characteristics of the sidewall 51.

[0099] In some examples, the depth, opening 711 width, and curvature of the buffer recess can be designed according to the expansion force characteristics of the sidewall 51, the material of the buffer 70, and the structural strength, so that the buffer recess can effectively buffer and release the expansion force of the sidewall 51, and is not likely to affect the structural strength and rigidity of the buffer 70 itself.

[0100] In some feasible implementations, the buffer space 71 is disposed through the buffer member 70 along the second direction Y, and the first direction X is perpendicular to the second direction Y.

[0101] When assembling the battery cell assembly 20 and the buffer 70, the middle area of ​​the side wall 51 of the battery cell assembly 20 can be relatively easily aligned with the buffer space 71, reducing the assembly difficulty of the battery cell assembly 20 and the buffer 70 and improving assembly efficiency.

[0102] In some examples, the buffer 70 is a strip-shaped structure. The length direction of the buffer 70 is the same as the second direction Y.

[0103] In some examples, the buffer space 71 is a buffer recess that extends through the buffer member 70 along the second direction Y.

[0104] In some examples, multiple battery cell assemblies 20 can be arranged within the housing 10a. The multiple battery cell assemblies 20 are arranged along a second direction Y. A buffer 70 can be provided on the same side of the multiple battery cell assemblies 20.

[0105] See also some of the possible implementation methods. Figure 5 As shown, buffer members 70 are respectively provided on opposite sides of the battery cell assembly 20 along the first direction X.

[0106] When the battery cell assembly 20 expands, it expands and deforms simultaneously to both sides in the first direction X. The buffer members 70 provided on opposite sides of the battery cell assembly 20 can simultaneously buffer and release the expansion force, which is beneficial to further buffer and release the expansion force in the middle area of ​​the side wall 51 and reduce the force exerted by the side wall 51 on the buffer members 70.

[0107] In some examples, multiple battery cell assemblies 20 are arranged between two buffers 70 along the first direction X.

[0108] In some feasible implementations, the buffer 70 is either a limiting beam or an end plate.

[0109] See in some examples Figure 7 and Figure 8 As shown, the buffer 70 is a limiting beam. The limiting beam can be connected to the housing 10a. The limiting beam can provide limiting constraints on the battery cell assembly 20 in the first direction X. The limiting beam is used to absorb collision energy and support the battery cell assembly 20.

[0110] When the side wall 51 expands and deforms, the buffer space 71 of the limiting beam can buffer and release the expansion force in the middle area of ​​the side wall 51, reduce the force exerted by the side wall 51 on the limiting beam, reduce the deformation of the limiting beam, reduce the possibility of stress concentration in the limiting beam, reduce the possibility of bending, deformation or breakage of the end connection area of ​​the limiting beam due to stress concentration, and improve the structural stability of the limiting beam itself and the connection stability between the limiting beam and the box 10a.

[0111] The limiting beam can provide limiting support for the edge area of ​​the side wall 51, thereby restricting the edge area of ​​the side wall 51 near the end cover 40, reducing the deformation of the edge area of ​​the side wall 51, keeping the structural stress of the connection area between the end cover 40 and the shell 50 stable, and reducing the possibility of connection failure.

[0112] For example, the material of the limiting beam may include, but is not limited to, aluminum, steel or magnesium-aluminum alloy.

[0113] For example, along the second direction Y, the limiting beam includes two opposing ends. The two ends are respectively connected and fixed to the box body 10a, for example, the two ends are respectively welded and fixed to the box body 10a.

[0114] For example, the buffer space 71 is a buffer recess, which makes the stress distribution of the limiting beam more uniform, which is beneficial to improving the strength and rigidity of the limiting beam.

[0115] See in some examples Figure 9 and Figure 10 As shown, the buffer 70 is an end plate. Each battery cell assembly 20 is provided with a corresponding end plate. The end plate can be connected to the housing 10a. The end plate can provide a limiting constraint on the battery cell assembly 20 in the first direction X. The end plate is used to absorb collision energy and support the battery cell assembly 20.

[0116] When the side wall 51 expands and deforms, the buffer space 71 of the end plate can buffer and release the expansion force in the middle area of ​​the side wall 51, reduce the force exerted by the side wall 51 on the end plate, reduce the amount of deformation of the end plate, reduce the possibility of stress concentration in the end plate, reduce the possibility of bending, deformation or breakage of the end connection area of ​​the end plate due to stress concentration, and improve the structural stability of the end plate itself and the connection stability between the end plate and the box 10a.

[0117] The end plate can provide limiting support for the edge area of ​​the side wall 51, thereby restricting the edge area of ​​the side wall 51 near the end cover 40, reducing the deformation of the edge area of ​​the side wall 51, keeping the structural stress of the connection area between the end cover 40 and the housing 50 stable, and reducing the possibility of connection failure.

[0118] For example, the material of the end plate may include, but is not limited to, aluminum, steel or magnesium-aluminum alloy.

[0119] For example, a limiting beam is provided inside the housing 10a. The end plate is connected to the limiting beam by bolts or riveting to improve the connection strength between the end plate and the limiting beam. The buffer space 71 of the end plate can buffer and release the expansion force of the middle area of ​​the side wall 51, reduce the force exerted by the side wall 51 on the end plate, and make the connection between the end plate and the limiting beam less prone to deformation or loosening.

[0120] For example, the buffer space 71 is a buffer recess, which makes the stress distribution of the end plate more uniform, which is beneficial to improving the strength and rigidity of the end plate.

[0121] In some examples, buffer members 70 are respectively provided on opposite sides of the battery cell assembly 20 along the first direction X. Both buffer members 70 can be limiting beams. Alternatively, both buffer members 70 can be end plates. Alternatively, one of the buffer members 70 on both sides can be a limiting beam and the other an end plate. Alternatively, both buffer members 70 on both sides can be insulating pads.

[0122] See also some of the possible implementation methods. Figure 7 or Figure 9 As shown, the battery device 10 also includes an elastic insulating member 80, a buffer member 70 connected to the housing 10a, and an elastic insulating member 80 disposed between the buffer member 70 and the side wall 51.

[0123] The elastic insulator 80 isolates the buffer 70 and the battery cell assembly 20, improving the safety of the battery device 10. When the sidewall 51 expands, the middle region of the sidewall 51 can apply an expansion force to the elastic insulator 80, causing the elastic insulator 80 to deform. The elastic insulator 80 and the buffer space 71 of the buffer 70 can work together to buffer and release the expansion force in the middle region of the sidewall 51, reducing the force exerted by the sidewall 51 on the buffer 70 and reducing the deformation of the buffer 70.

[0124] In some examples, the resilient insulator 80 is a solid structural member. The resilient insulator 80 is a plate-like structure.

[0125] In some examples, the material of the elastic insulator 80 may include, but is not limited to, rubber, polyurethane, or silicone.

[0126] In some examples, the buffer space 71 includes a buffer recess with an opening 711 facing the sidewall 51. An elastic insulating member 80 covers the opening 711 of the buffer recess. When the sidewall 51 expands and deforms, it compresses the middle region of the elastic insulating member 80, which can deform and enter the buffer recess.

[0127] See also some of the possible implementation methods. Figure 11 , Figure 12 and Figure 13 As shown, the buffer 70 includes two side plates 74 opposite each other along the first direction X and a plurality of first ribs 73 spaced apart along the third direction Z. The middle region of one of the two side plates 74 is provided with a plurality of first ribs 73, and the other side and the plurality of first ribs 73 are spaced apart along the first direction X to form a buffer space 71. The first direction X is perpendicular to the third direction Z.

[0128] Two side plates 74 are spaced apart along the first direction X. When the side wall 51 expands and deforms, the side wall 51 presses against the middle area of ​​the side plate 74, and the middle area of ​​the side plate 74 can be recessed to reduce the volume of the buffer space 71. The buffer member 70 buffers and releases the expansion force of the middle area of ​​the side wall 51.

[0129] Setting the first rib 73 helps to improve the structural strength of the buffer 70 itself and improve the impact resistance of the buffer 70.

[0130] In some examples, along the second direction Y, the buffer space 71 extends through the buffer 70.

[0131] In some examples, a first rib 73 is provided on the side plate 74 away from the battery cell assembly 20, and the side plate 74 close to the battery cell assembly 20 and the first rib 73 are spaced apart in the first direction X.

[0132] See also some of the possible implementation methods. Figure 11 As shown, the battery device 10 also includes a limiting member 90, which is connected to the housing 10a. Along the first direction X, the battery cell assembly 20 and the limiting member 90 are arranged together, and a buffer member 70 is provided between the limiting member 90 and the battery cell assembly 20. The limiting member 90 can be connected to the housing 10a. The limiting member 90 can provide a limiting constraint on the battery cell assembly 20 in the first direction X. The limiting member 90 is used to absorb collision energy and support the battery cell assembly 20.

[0133] When the side wall 51 expands and deforms, the buffer space 71 of the buffer member 70 can buffer and release the expansion force in the middle area of ​​the side wall 51, reduce the force exerted by the side wall 51 on the limiting member 90, reduce the deformation of the limiting member 90, reduce the possibility of stress concentration in the limiting member 90, reduce the possibility of bending, deformation or breakage of the end connection area of ​​the limiting member 90 due to stress concentration, and improve the structural stability of the limiting member 90 itself and the connection stability between the limiting member 90 and the box 10a.

[0134] In some examples, the limiting member 90 can be a solid structural member or a profile with multiple through holes.

[0135] In some examples, the limiting element 90 is a limiting beam or end plate.

[0136] See in some examples Figure 11 , Figure 12 and Figure 13 As shown, the buffer 70 is an insulating pad. Each battery cell assembly 20 is provided with a corresponding insulating pad. The insulating pad serves to provide insulation and isolation, improving the safety of the battery cell assembly 20.

[0137] When the sidewall 51 expands and deforms, the buffer space 71 of the insulating pad can buffer and release the expansion force in the middle area of ​​the sidewall 51, reduce the force exerted by the sidewall 51 on the insulating pad, and reduce the force exerted by the sidewall 51 on the limiting member 90.

[0138] The insulating pad can provide limiting support for the edge area of ​​the side wall 51, thereby restricting the edge area of ​​the side wall 51 near the end cover 40, reducing the deformation of the edge area of ​​the side wall 51, keeping the structural stress of the connection area between the end cover 40 and the housing 50 stable, and reducing the possibility of connection failure.

[0139] For example, the material of the insulating pad may include, but is not limited to, rubber, polyurethane, or silicone.

[0140] See also some of the possible implementation methods. Figure 12 and Figure 13 As shown, the buffer member 70 includes two side plates 74 facing each other along a first direction X. The buffer member 70 also includes a plurality of second ribs 75 spaced apart along a third direction Z. The two side plates 74 are respectively connected to the second ribs 75. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. A through hole 72 is formed between the side plates 74 and the second ribs 75. Along the third direction Z, the second ribs 75 are correspondingly arranged in the areas of the side plates 74 that are relatively close to the edge.

[0141] The method of setting the second rib 75 is beneficial to improving the structural strength of the buffer 70 itself and improving the impact resistance of the buffer 70.

[0142] See in some examples Figure 12 As shown, the buffer 70 includes a plurality of through holes 72. The plurality of through holes 72 are spaced apart along the third direction Z. Adjacent through holes 72 are separated by a second rib 75.

[0143] According to some embodiments of this application, this application also provides an electrical device including a battery device 10 of any of the above schemes, and the battery device 10 is used to provide electrical energy to the electrical device.

[0144] The power supply device can be any of the aforementioned devices or systems that utilize battery device 10.

[0145] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: Box; A battery cell assembly is disposed within the housing, the battery cell assembly comprising a battery cell, the battery cell comprising two sidewalls disposed opposite to each other along a first direction; A buffer element is disposed within the housing. Along the first direction, the battery cell assembly and the buffer element are arranged together. The buffer element includes a buffer space. Wherein, along the first direction, the middle region of the sidewall is correspondingly disposed to the buffer space, and the buffer space is disposed close to the sidewall. The buffer space includes a buffer recess, which includes an opening facing the sidewall.

2. The battery device according to claim 1, characterized in that, Along the second direction, the buffer space extends through the buffer member, and the first direction is perpendicular to the second direction.

3. The battery device according to claim 1, characterized in that, Along the first direction, the buffer members are respectively provided on opposite sides of the battery cell assembly.

4. The battery device according to any one of claims 1 to 3, characterized in that, The buffer component is either the limiting beam or the end plate.

5. The battery device according to any one of claims 1 to 3, characterized in that, The battery device also includes an elastic insulating element, the buffer element is connected to the housing, and the elastic insulating element is disposed between the buffer element and the side wall.

6. A battery device, characterized in that, include: Box; A battery cell assembly is disposed within the housing, the battery cell assembly comprising a battery cell, the battery cell comprising two sidewalls disposed opposite to each other along a first direction; A buffer element is disposed within the housing. Along the first direction, the battery cell assembly and the buffer element are arranged together. The buffer element includes a buffer space. Along the first direction, the middle region of the sidewall is correspondingly disposed with the buffer space, and the buffer space is disposed close to the sidewall. The buffer includes two side plates opposite each other along the first direction and a plurality of first ribs spaced apart along a third direction. The middle region of one of the two side plates is provided with a plurality of the first ribs, and the other side plate and the plurality of the first ribs are spaced apart along the first direction to form the buffer space. The first direction is perpendicular to the third direction.

7. The battery device according to claim 6, characterized in that, Along the second direction, the buffer space extends through the buffer member, and the first direction, the second direction, and the third direction are perpendicular to each other.

8. The battery device according to claim 6, characterized in that, Along the first direction, the buffer members are respectively provided on opposite sides of the battery cell assembly.

9. The battery device according to any one of claims 6 to 8, characterized in that, The battery device further includes a limiting member connected to the housing. Along the first direction, the battery cell assembly and the limiting member are arranged together, and the buffer member is disposed between the limiting member and the battery cell assembly.

10. The battery device according to any one of claims 6 to 8, characterized in that, The buffer is an insulating pad.

11. The battery device according to any one of claims 6 to 8, characterized in that, The buffer also includes a plurality of second ribs spaced apart along the third direction, and the two side plates are respectively connected to the second ribs.

12. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1 to 11, the battery device being used to provide electrical energy.

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