Battery devices and electrical equipment

Abstract

The present application discloses a battery device and an electrical device. The battery device includes a case, a plurality of battery cells, a buffer and an insulating member. A plurality of battery cells are contained in the case and bonded to the first wall of the case. A plurality of battery cells are arranged along the thickness direction of the battery cells. The battery cells have two first surfaces opposite to each other along the thickness direction. The first surface has a central area and an edge area, and the edge area surrounds the central area. The buffer is arranged between two adjacent battery cells, and the two sides of the buffer along the thickness direction are respectively attached to the edge areas of the two adjacent battery cells close to the first wall. The insulating member is arranged between two adjacent battery cells, and the insulating member and the buffer are enclosed to form a gap. The elastic modulus of the buffer is greater than the elastic modulus of the insulating member. The present application is conducive to reducing the possibility of colloid overflowing to the first surfaces opposite to two adjacent battery cells, reducing the risk of lithium plating, extending the cycle life of the battery device, and improving reliability.

Description

Technical Field

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

[0002] With the development of new energy technology, the application of batteries is becoming more and more extensive. For example, batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields.

[0003] The development of battery technology must take into account many design factors at the same time, such as energy density, cycle life, assembly efficiency, processing technology, etc., and the reliability of the battery must also be considered. Utility Model Content

[0004] The embodiments of the present application provide a battery device and an electrical device, which are beneficial to extending the cycle life of the battery device and improving its reliability and energy density.

[0005] According to a first aspect of the present application, the present application provides a battery device, which includes a case, a plurality of battery cells, a buffer and an insulating member. The case includes a first case wall. A plurality of battery cells are accommodated in the case and bonded to the first case wall, and a plurality of battery cells are arranged along the thickness direction of the battery cells. The battery cells have two first surfaces opposite to each other along the thickness direction, and the first surface has a central area and an edge area, and the edge area surrounds the central area. The buffer is arranged between two adjacent battery cells, and the two sides of the buffer along the thickness direction are respectively attached to the edge areas of the two adjacent battery cells close to the first case wall. The insulating member is arranged between two adjacent battery cells, and the insulating member and the buffer are enclosed to form a gap. The elastic modulus of the buffer is greater than the elastic modulus of the insulating member.

[0006] The elastic modulus of the buffer is relatively small, the rigidity is small, and it is relatively easy to deform. During the assembly process, the buffer can be pressed against the first surface of the two adjacent battery cells by squeezing the two adjacent battery cells, thereby reducing the gap between the buffer and the battery cell and improving the sealing, thereby reducing the possibility of the colloid overflowing from the gap between the buffer and the battery cell to the first surface of the two adjacent battery cells, which is conducive to alleviating the stress concentration phenomenon caused by the solidification of the colloid in the battery cell, reducing the risk of lithium precipitation, extending the cycle life of the battery device, and improving its reliability. The elastic modulus of the insulating part is relatively large, the rigidity is large, and it is not easy to deform. It can provide greater support for the two adjacent battery cells, which is conducive to reducing the thickness of the insulating part and the buffer while meeting the hoisting requirements during the assembly of the battery device, improving the space utilization rate, and thus improving the energy density of the battery device.

[0007] In some embodiments, the first box wall is a wall portion of the box body in the first direction, the buffer extends in the second direction, and the first direction, the second direction and the thickness direction are perpendicular to each other; the insulating member includes a first insulating member, at least part of the first insulating member is located on the side of the buffer away from the first box wall in the first direction, and along the thickness direction, the projection of the first insulating member is located within the projection of the edge area; the first insulating member is connected to the buffer. The first insulating member is connected to the buffer, which can reduce the gap between the first insulating member and the buffer. The first insulating member is arranged in the edge area of ​​the first surface along the second direction, which is conducive to blocking the colloid on the outside of the edge area facing away from the central area, reducing the risk of the colloid overflowing to the central area through the gap between the first insulating member and the buffer in the second direction, thereby reducing the stress concentration phenomenon caused by the adhesive in the central area, which is conducive to further reducing the risk of lithium plating, extending the cycle life of the battery device, and improving its reliability.

[0008] In some embodiments, one of the first insulating member and the buffer member is provided with a first concave portion on a side facing the other member along the first direction, and the other member is provided with a first convex portion, and the first convex portion is inserted into the first concave portion. A reciprocatingly bent mating interface can be formed between the first convex portion and the first concave portion, which is conducive to extending the overflow path from the outside of the first insulating member and the buffer member facing away from the central area to the inside of the first insulating member and the buffer member facing the central area, increasing the flow resistance of the colloid, improving the sealing effect between the first insulating member and the buffer member, and further reducing the risk of the colloid overflowing to the central area.

[0009] In some embodiments, the buffer comprises a first main body, the first main body has a second surface facing away from the first box wall along the first direction, and the first recess is sunken in the second surface; the first insulating member comprises a second main body and a first protrusion, the second main body has a third surface facing the first box wall along the first direction, and the first protrusion protrudes from the third surface in a direction close to the first box wall. Thus, the volume of the first insulating member can be appropriately increased and the volume of the buffer can be reduced, which is conducive to increasing the support area between the insulating member and the battery cell, improving the support strength, reducing the deformation of the side of the multiple battery cells close to the first box wall during hoisting, and improving the assembly efficiency.

[0010] In some embodiments, the second surface is attached to the third surface. Thus, the gap between the second surface and the third surface can be compressed, which is beneficial to reduce the flowable area of ​​the colloid between the buffer and the first insulating member, increase the flow resistance of the colloid, further improve the sealing effect between the first insulating member and the buffer, reduce the risk of the colloid overflowing to the central area, and improve the reliability of the battery cell.

[0011] In some embodiments, the outer surface of the first convex portion is attached to the inner surface of the first concave portion, thereby reducing the gap between the mating interface of the first convex portion and the first concave portion, which is beneficial to further improve the sealing performance and reduce the risk of colloid overflowing to the central area.

[0012] In some embodiments, there are multiple first concave portions and multiple first convex portions, the multiple first concave portions are spaced apart along the second direction, and the multiple first convex portions are inserted into the multiple first concave portions one by one. Thus, the flow path of the colloid can be further extended within a limited space, the flow resistance of the colloid can be increased, and the risk of the colloid overflowing to the central area can be further reduced.

[0013] In some embodiments, the buffer includes a first main body and a second protrusion, the first main body extends along the second direction, the second protrusion is connected to the end of the first main body along the second direction, and protrudes from the second surface of the first main body facing away from the first box wall in the direction away from the first box wall; along the second direction, the second protrusion is arranged outside the at least part of the first insulating member facing away from the central area. The second protrusion can extend the distance between the first box wall and the outermost gap between the buffer and the first insulating member in the second direction in the first direction, which is conducive to increasing the difficulty of the colloid flowing to the gap between the buffer and the first insulating member, reducing the possibility of the colloid flowing into the gap between the buffer and the first insulating member, and reducing the risk of the colloid overflowing to the central area.

[0014] In some embodiments, the first insulating member is provided with a second recessed portion, which is recessed along the second direction into the outer surface of the first insulating member facing away from the central region; the second convex portion is at least partially accommodated in the second recessed portion and fits against the inner wall of the second recessed portion. A step-shaped mating interface can be formed between the second convex portion and the second recessed portion, which is conducive to further extending the flow path of the colloid; the mating interface between the second convex portion and the second recessed portion fits against each other, which is conducive to further increasing the flow resistance of the colloid, thereby reducing the risk of the colloid overflowing to the central region.

[0015] In some embodiments, along the second direction, the outer surface of the first insulating member does not exceed the second convex portion. This facilitates the colloid to flow smoothly along the first direction from the fourth surface of the second convex portion to the outer surface of the first insulating member, reduces the resistance of the colloid to flow outside the first insulating member and the buffer, reduces the possibility of the colloid flowing into the gap between the first insulating member and the buffer, and thus reduces the risk of the colloid flowing to the central area of ​​the battery cell.

[0016] In some embodiments, there are two first insulating members, which are spaced apart along the second direction. Thus, the two first insulating members and the buffer member can prevent the colloid from flowing from both sides of the second direction to the central area, which is helpful to reduce the possibility of the colloid flowing from all possible directions to the central area and improve the effect of preventing the overflow of the glue.

[0017] In some embodiments, the insulating member includes a second insulating member, the second insulating member extends along the second direction, and the second insulating member and the buffer member are spaced apart along the first direction. The second insulating member can support at least part of two adjacent battery cells along the first direction, increase the supporting area of ​​the insulating member, improve its supporting effect, reduce the extrusion deformation between two adjacent battery cells, facilitate the hoisting of multiple battery cells, and improve their assembly efficiency.

[0018] In some embodiments, the second insulating member is disposed on the side of the first insulating member facing away from the first box wall; along the thickness direction, the projection of the second insulating member is located in the projection of the edge area. The second insulating member can support the edges of two adjacent battery cells away from the first box wall along the first direction, and the insulating member can provide relatively balanced support for the two adjacent battery cells, which is beneficial to improving the support effect. In addition, the insulating member can also reduce the blocking effect of the central area of ​​the first surface of the battery cell, which is beneficial to the convex deformation of the central area and reduces the stress concentration phenomenon.

[0019] In some embodiments, along the arrangement direction of the first box wall and the battery cells, the buffer is spaced from the first box wall. A certain space can be formed between the buffer and the first box wall, which can be used to accommodate part of the overflowed colloid, reducing the possibility or amount of the colloid overflowing to other areas.

[0020] According to the second aspect of the present application, an embodiment of the present application further provides an electrical device, which includes a battery device provided according to any embodiment of the first aspect of the present application, and the battery device is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a schematic diagram of the structure of a vehicle provided in some embodiments of the present application.

[0023] Figure 2 It is a schematic diagram of the exploded structure of a battery device provided in some embodiments of the present application.

[0024] Figure 3 It is a schematic structural diagram of a battery device provided in some embodiments of the present application, in which a part of the structure is in a disassembled state.

[0025] Figure 4 It is a schematic diagram of the structure of a battery cell, an insulating component and a buffer component of a battery device provided in some embodiments of the present application.

[0026] Figure 5 It is a schematic cross-sectional structural diagram of a portion of the structure of a battery device provided in some embodiments of the present application.

[0027] Figure 6 yes Figure 5 Schematic diagram of the enlarged structure of area A in the middle.

[0028] Figure 7 yes Figure 6 Schematic diagram of the structure in which the insulating parts and buffer parts are in a disassembled state.

[0029] In the attached figure:

[0030] Vehicles 1000;

[0031] Battery device 100, controller 200, motor 300;

[0032] Box body 10, first box body portion 10a, second box body portion 10b, accommodating space 10c, first box wall 11, second box wall 12, third box wall 13, battery cell 20, first surface 21, central area 211, edge area 212, first edge area 2121, second edge area 2122, third edge area 2123, buffer 30, first recess 31, first main body portion 32, second surface 32a, second protrusion 33, fourth surface 33a, insulating member 40, first insulating member 41, first protrusion 411, second main body portion 412, third surface 412a, second recess 413, outer surface 41a, second insulating member 42;

[0033] Thickness direction X, first direction Y, second direction Z. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0036] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0037] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0039] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0040] The term “plurality” used in this application refers to two or more (including two).

[0041] In the embodiments of the present application, "parallel" includes not only the absolutely parallel situation, but also the roughly parallel situation conventionally recognized in engineering; at the same time, "vertical" includes not only the absolutely vertical situation, but also the roughly vertical situation conventionally recognized in engineering.

[0042] In the embodiment of the present application, the battery cell may be a secondary battery cell, which refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0043] The battery cells can be lithium-ion battery cells, sodium-ion battery cells, sodium-lithium-ion battery cells, lithium metal battery cells, sodium metal battery cells, lithium-sulfur battery cells, magnesium-ion battery cells, nickel-hydrogen battery cells, nickel-cadmium battery cells, lead-acid battery cells, etc., which are not limited in the embodiments of the present application.

[0044] A battery cell generally includes an electrode assembly, a housing, and an electrode terminal. The electrode assembly is contained in the housing, and the electrode terminal is disposed in the housing. The housing is used to encapsulate the electrode assembly and components such as the electrolyte. The electrode assembly includes a tab, which is electrically connected to the electrode terminal through an adapter or directly electrically connected to the electrode terminal. The electrode terminal can be used to electrically connect the electrode assembly to a circuit outside the battery cell to realize charging or discharging of the battery cell.

[0045] The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and released back and forth between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0046] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0047] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0048] In some embodiments, a separator is disposed between the positive electrode and the negative electrode.

[0049] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

[0050] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0051] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0052] In some embodiments, the electrode assembly is a laminate structure.

[0053] The battery device mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, in parallel or in mixed connection through a busbar.

[0054] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.

[0055] A battery device generally includes a case for encapsulating one or more battery cells, which can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0056] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by cable ties. The battery cell assembly may be accommodated in the box by fixing the battery module in the box. As an example, the box may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box to accommodate the battery cell assembly.

[0057] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0058] In some embodiments, the battery device may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0059] In the related art, an insulating member in the shape of a frame is provided between two adjacent battery cells of a battery module. After the battery modules are assembled, they are hoisted into a box and bonded to the inner surface of the box. In order to meet the hoisting requirements, the battery module should not be greatly deformed after being hoisted. Therefore, the insulating member is usually harder, and a larger gap is easily formed between the insulating member and the battery cell. The structural adhesive on the inner surface of the box easily overflows to the relative surfaces of two adjacent battery cells through the gap formed between the insulating member and the battery cell. The structural adhesive hardens after curing, resulting in that the relative surfaces of the battery cells are not easily deformed. The battery cells swell during use, and stress concentration is easily generated in the harder areas on the surface of the battery cells, which affects the lithium ion transmission within the battery cells, resulting in lithium plating, and affecting the cycle life and reliability of the battery device.

[0060] In view of this, an embodiment of the present application provides a technical solution, which provides space for the expansion of the battery cell by arranging an insulating member and a buffer member between two adjacent battery cells. The insulating member and the buffer member enclose a gap to provide space for the expansion of the battery cell. The buffer member fits the edge area of ​​the two adjacent battery cells close to the first box wall. The elastic modulus of the buffer member is relatively small, the rigidity is relatively small, and it is relatively easier to deform. During the assembly process, the buffer member can be pressed against the two adjacent battery cells by squeezing the two adjacent battery cells, and the gap between the buffer member and the battery cell can be reduced, which is conducive to reducing the possibility of the colloid overflowing through the gap between the buffer member and the battery cell to the first surface opposite to the two adjacent battery cells, alleviating the stress concentration phenomenon of the battery cell caused by the solidification of the colloid, reducing the risk of lithium plating, extending the cycle life of the battery device, and improving its reliability.

[0061] The insulating part has a relatively large elastic modulus, large rigidity, and is not easy to deform. It can provide greater support for two adjacent battery cells, which is beneficial for reducing the thickness of the insulating part and the buffer part while meeting the lifting requirements during the assembly of the battery device, improving space utilization, and thus increasing the energy density of the battery device.

[0062] The technical solution provided in the embodiments of the present application can be used in battery devices and electrical equipment that uses the battery devices as a power source.

[0063] The electrical equipment may be, but is not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, the electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and the spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0064] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0065] Figure 1 is a schematic diagram of the structure of a vehicle provided by some embodiments of the present application. Figure 1 The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000. The battery device 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000. For example, the battery device 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to power the motor 300, for example, to meet the power requirements for starting, navigating and driving the vehicle 1000.

[0066] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0067] Figure 2 is a schematic diagram of the exploded structure of a battery device provided in some embodiments of the present application. Figure 2 The battery device 100 includes a box body 10 and a battery cell 20, and the battery cell 20 is accommodated in the box body 10. The box body 10 is used to provide a storage space 10c for the battery cell 20, and the box body 10 can adopt a variety of structures. In some embodiments, the box body 10 may include a first box body portion 10a and a second box body portion 10b, the first box body portion 10a and the second box body portion 10b cover each other, and the first box body portion 10a and the second box body portion 10b jointly define a storage space 10c for accommodating the battery cell 20. The second box body 10b can be a hollow structure with one end open, the first box body 10a can be a plate-like structure, and the first box body 10a covers the open side of the second box body 10b, so that the first box body 10a and the second box body 10b jointly define a storage space; the first box body 10a and the second box body 10b can also be hollow structures with one side open, and the open side of the first box body 10a covers the open side of the second box body 10b. Of course, the box body 10 formed by the first box body 10a and the second box body 10b can be a variety of shapes, such as a cylinder, a cuboid, etc.

[0068] In order to improve the sealing performance after the first box body 10a and the second box body 10b are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body 10a and the second box body 10b.

[0069] Assuming that the first box body portion 10a covers the top of the second box body portion 10b, the first box body portion 10a can also be called an upper box cover, and the second box body portion 10b can also be called a lower box.

[0070] In the battery device 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery device 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery device 100 may also include other structures, for example, the battery device 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.

[0071] Exemplarily, the battery cell 20 may be a smallest unit constituting the battery device 100 .

[0072] Figure 3 is a schematic diagram of a battery device provided in some embodiments of the present application in which a portion of the structure is in a disassembled state, Figure 4 is a schematic diagram of the structure of a battery cell, an insulating member and a buffer member of a battery device provided in some embodiments of the present application, Figure 5 is a schematic cross-sectional view of a partial structure of a battery device provided in some embodiments of the present application, Figure 6 yes Figure 5 Schematic diagram of the enlarged structure of area A in the middle. Figure 7 yes Figure 6 Schematic diagram of the structure in which the insulating parts and buffer parts are in a disassembled state.

[0073] Reference Figures 2 to 7 In some embodiments, the battery device 100 includes a box body 10, a plurality of battery cells 20, a buffer 30 and an insulating member 40. The box body 10 includes a first box wall 11. The plurality of battery cells 20 are accommodated in the box body 10 and bonded to the first box wall 11. The plurality of battery cells 20 are arranged along the thickness direction X of the battery cells 20. The battery cells 20 have two first surfaces 21 opposite to each other along the thickness direction X. The first surface 21 has a central area 211 and an edge area 212. The edge area 212 surrounds the central area 211. The buffer 30 is disposed between two adjacent battery cells 20. The buffer 30 is attached to the edge areas 212 of the two adjacent battery cells 20 close to the first box wall 11 on both sides of the thickness direction X. The insulating member 40 is disposed between two adjacent battery cells 20. The insulating member 40 and the buffer 30 enclose a gap. The elastic modulus of the insulating member 40 is greater than the elastic modulus of the buffer 30.

[0074] The first box wall 11 may be one of the walls of the first box body portion 10 a , or may be one of the walls of the second box body portion 10 b .

[0075] Optionally, the first box wall 11 is a wall of the second box body portion 10b away from the first box body portion 10a along the first direction Y, and the first direction Y is parallel to the arrangement direction of the battery cells 20 and the first box wall 11. The box body 10 also includes a second box wall 12 opposite to the first box wall 11 along the first direction Y, and at least one third box wall 13 connected between the first box wall 11 and the second box wall 12. The second box wall 12 is a wall of the first box body portion 10a, and the third box wall 13 can be a complete wall structure, or can include two parts connected along the first direction Y.

[0076] The multiple battery cells 20 can be bonded to the inner surface of the first box wall 11 by means of colloid. During assembly, the colloid can be pre-coated on the inner surface of the first box wall 11, and the multiple battery cells 20 are bonded to the colloid after being loaded into the box body 10. The colloid can also be pre-coated on the surface of the multiple battery cells 20 opposite to the first box wall 11, and the colloid is bonded to the first box wall 11 after the multiple battery cells 20 are loaded into the box body 10. The multiple battery cells 20 can also be loaded into the box body 10 first, and then the colloid is squeezed between the multiple battery cells 20 and the first box wall 11.

[0077] Each battery cell 20 among the plurality of battery cells 20 is bonded to the first box wall 11 to improve the stability of the installation of each battery cell 20 and reduce the shaking of the battery cell 20 .

[0078] The first box wall 11 is disposed adjacent to each battery cell 20. The first box wall 11 may be other wall portions except the two opposite wall portions of the box body 10 along the thickness direction X.

[0079] Optionally, the first box wall 11 may be a bottom wall of the box body 10 for supporting the plurality of battery cells 20 , or may be a side wall of the box body 10 .

[0080] The central area 211 of the first surface 21 refers to an area defined by the geometric center of the first surface 21 as the center and a closed contour line of a predetermined shape as the edge, and the closed contour line is spaced apart from the periphery of the first surface 21 .

[0081] The closed contour line may be a closed curve or a closed broken line.

[0082] Exemplarily, the closed contour line is a square ring-shaped broken line, and the central area of ​​the first surface 21 is a square area centered on the geometric center of the first surface 21. The length of the square area can be about 20% of the total length of the first surface 21, and the width of the square area can be about 20% of the total width of the first surface 21.

[0083] As another example, the closed contour line is a circular curve, and the central area of ​​the first surface 21 is a circular area centered on the geometric center of the first surface 21 , and the diameter of the circular area may be about 20% of the total width of the first surface 21 .

[0084] As another example, the closed contour line may also be an elliptical curve, and the central area of ​​the first surface 21 is an elliptical area centered on the geometric center of the first surface 21, the short axis length of the elliptical area may be approximately 20% of the total width of the first surface 21, and the long axis length of the elliptical area may be approximately 20% of the total length of the first surface 21.

[0085] Optionally, the edge region 212 may include a first edge area 2121, and the first edge area 2121 is close to the first box wall 11. The buffer member 30 is attached to the first edge areas 2121 of two adjacent battery cells 20 at both sides along the thickness direction X.

[0086] The buffer member 30 may be connected to two adjacent battery cells 20. Optionally, the buffer member 30 may be connected to the first edge regions 2121 of two adjacent battery cells 20 by bonding, abutting or other suitable means.

[0087] The first box wall 11 can be a wall portion of the box body 10 in the first direction Y. The edge region 212 can also include a second edge region 2122 and two third edge regions 2123, the second edge region 2122 is opposite to the first edge region 2121 along the first direction Y and is arranged at intervals, the two third edge regions 2123 are opposite to each other and are arranged at intervals along the second direction Z, and each third edge region 2123 is connected between the first edge region 2121 and the second edge region 2122. The first direction Y, the second direction Z and the thickness direction X are perpendicular to each other. The first edge region 2121, the second edge region 2122 and the two third edge regions 2123 together form a substantially square ring-shaped edge region 212.

[0088] When the battery cell 20 expands, the degree of outward protrusion of the first surface 21 is usually uneven. The central area 211 of the first surface 21 protrudes outward to the greatest extent. To this end, along the thickness direction X, the projection of the gap formed by the buffer 30 and the insulating member 40 and the projection of the central area 211 at least partially overlap, so as to provide space for the expansion of the central area 211 through the gap.

[0089] The insulating member 40 may be connected to at least one of the two adjacent battery cells 20. Optionally, the insulating member 40 may be connected to the first surface 21 of at least one of the two adjacent battery cells 20 by bonding, abutting or other suitable means.

[0090] In some examples, the gap formed by the insulating member 40 and the buffer member 30 may be a closed gap. For example, the insulating member 40 is an integrally formed structure, and two ends of the insulating member 40 are respectively connected to two ends of the buffer member 30 to form a closed annular gap.

[0091] In other examples, the gap formed by the insulating member 40 and the buffer member 30 may also be an open gap. Exemplarily, the insulating member 40 is an integrally formed structure, and at least one end of the insulating member 40 is spaced apart from the adjacent end of the buffer member 30 to form a channel, and the gap formed by the insulating member 40 and the buffer member 30 is connected to the external space through the channel. Exemplarily, the insulating member 40 may also include a plurality of independently formed parts, and the plurality of independently formed parts are spaced apart along the periphery of the central area 211 to form a channel, and the gap formed by the insulating member 40 and the buffer member 30 may be connected to the external space through the channel.

[0092] Both the insulating member 40 and the buffer member 30 can be components capable of generating elastic deformation to buffer the forces between the battery cell 20 and the insulating member 40 and between the battery cell 20 and the buffer member 30 , thereby reducing the stress on the battery cell 20 and lowering the risk of damage to the battery cell 20 .

[0093] The elastic modulus of the insulating member 40 is greater than that of the buffer member 30. The rigidity of the insulating member 40 is greater than that of the buffer member 30. Under the same external force, the buffer member 30 is more likely to be elastically deformed than the insulating member 40.

[0094] Optionally, the insulating member 40 may be a rubber member, a silicone member, etc. The buffer member 30 may be a foam made of a microporous foam material. Exemplarily, the material of the buffer member 30 may include microporous foamed polypropylene, and the cell size thereof may be less than 100 μm.

[0095] The elastic modulus of the buffer 30 is relatively small, the rigidity is relatively small, and it is relatively easy to deform. During the assembly process, the buffer 30 can be pressed against the first surfaces 21 of the two adjacent battery cells 20 by squeezing the two adjacent battery cells 20, thereby reducing the gap between the buffer 30 and the battery cell 20 and improving the sealing performance, thereby reducing the possibility of the colloid overflowing through the gap between the buffer 30 and the battery cell 20 to the first surfaces 21 of the two adjacent battery cells 20, which is conducive to alleviating the stress concentration phenomenon of the battery cell 20 caused by the solidification of the colloid, reducing the risk of lithium plating, extending the cycle life of the battery device, and improving its reliability.

[0096] The insulating member 40 has a relatively large elastic modulus, high rigidity, and is not easily deformed, and can provide greater support for two adjacent battery cells 20 , which is beneficial for reducing the thickness of the insulating member 40 and the buffer member 30 while meeting the hoisting requirements during the assembly of the battery device 100 , thereby improving space utilization and thus improving the energy density of the battery device 100 .

[0097] In some embodiments, the first box wall 11 is a wall portion of the box body 10 in the first direction Y, the buffer member 30 extends along the second direction Z, and the first direction Y, the second direction Z and the thickness direction X are perpendicular to each other. The insulating member 40 includes a first insulating member 41, and at least a portion of the first insulating member 41 is located on a side of the buffer member 30 away from the first box wall 11 along the first direction Y. Along the thickness direction X, the projection of the first insulating member 41 is located within the projection of the edge region 212, and the first insulating member 41 is connected to the buffer member 30.

[0098] The first direction Y is parallel to the arrangement direction of the battery cells 20 and the first box wall 11 .

[0099] The first insulating member 41 may extend along the first direction Y and may be substantially in a strip-shaped structure. The first insulating member 41 may be adjacent to an edge of the first surface 21 in the second direction Z. Optionally, along the thickness direction X, the projection of the first insulating member 41 is located within the projection of the third edge region 2123 .

[0100] The buffer member 30 may be substantially in a conditional structure extending along the second direction Z. Two ends of the buffer member 30 along the second direction Z may be adjacent to two edges of the first surface 21 in the second direction Z, respectively.

[0101] The connection methods between the first insulating member 41 and the buffer member 30 include but are not limited to bonding, plugging, abutting, and clamping.

[0102] When the battery cell 20 expands, the central area 211 of the first surface 21 bulges outward and deforms more obviously. If the central area 211 is too hard and difficult to deform, it will be subjected to greater stress, and stress concentration and lithium deposition will occur more easily.

[0103] To this end, in the embodiment of the present application, the first insulating member 41 is connected to the buffer member 30, which can reduce the gap between the first insulating member 41 and the buffer member 30. The first insulating member 41 is arranged in the edge area 212 of the first surface 21 along the second direction Z, which is beneficial to blocking the colloid on the outer side of the edge area 212 facing away from the central area 211, thereby reducing the risk of the colloid overflowing to the central area 211 through the gap between the first insulating member 41 and the buffer member 30 along the second direction Z, thereby reducing the stress concentration phenomenon in the central area 211 caused by the adhesive, which is beneficial to further reduce the risk of lithium plating, extend the cycle life of the battery device, and improve its reliability.

[0104] In some embodiments, one of the first insulating member 41 and the buffer member 30 has a first recess 31 on a side facing the other along the first direction Y, and the other has a first protrusion 411 inserted into the first recess 31 .

[0105] In some examples, the first concave portion 31 may be disposed on a side of the first insulating member 41 facing the buffer member 30 along the first direction Y and recessed away from the buffer member 30 . The first convex portion 411 is formed on the buffer member 30 and protrudes toward the first insulating member 41 .

[0106] In other examples, the first concave portion 31 may also be disposed on a side of the buffer 30 facing the first insulating member 41 along the first direction Y and recessed away from the first insulating member 41. The first convex portion 411 is formed on the first insulating member 41 and protrudes toward the buffer 30.

[0107] The shapes of the first convex portion 411 and the first concave portion 31 match each other. Exemplarily, the first convex portion 411 and the first concave portion 31 are both cylindrical, prism-shaped, conical or other suitable shapes.

[0108] At least a portion of the outer surface of the first convex portion 411 may be in contact with the inner surface of the first concave portion 31 , or at least a portion of the outer surface of the first convex portion 411 may be spaced apart from the inner surface of the first concave portion 31 .

[0109] The first convex portion 411 is inserted into the first concave portion 31 along the first direction Y. A reciprocatingly bent mating interface can be formed between the first convex portion 411 and the first concave portion 31, which is conducive to extending the glue overflow path from the outer side of the first insulating member 41 and the buffer member 30 facing away from the central area 211 to the inner side of the first insulating member 41 and the buffer member 30 facing the central area 211, increasing the flow resistance of the glue, improving the sealing effect between the first insulating member 41 and the buffer member 30, and further reducing the risk of the glue overflowing to the central area 211.

[0110] In some embodiments, the buffer member 30 includes a first main body portion 32, the first main body portion 32 has a second surface 32a facing away from the first box wall 11 along the first direction Y, and the first recessed portion 31 is recessed in the second surface 32a. The first insulating member 41 includes a second main body portion 412 and a first protruding portion 411, the second main body portion 412 has a third surface 412a facing the first box wall 11 along the first direction Y, and the first protruding portion 411 protrudes from the third surface 412a in a direction close to the first box wall 11.

[0111] The first body portion 32 may extend along the second direction Z, and the second body portion 412 may extend along the first direction Y.

[0112] The depth of the first concave portion 31 sunken into the second surface 32 a and the length of the first convex portion 411 protruding from the third surface 412 a may be the same as or different from each other.

[0113] In some examples, the depth of the first recess 31 sunken into the second surface 32a may be equal to the length of the first protrusion 411 protruding from the third surface 412a, and the first protrusion 411 abuts against the bottom wall of the first recess 31 to reduce the possibility of colloid passing through.

[0114] In other examples, the depth of the first recess 31 sunken into the second surface 32a may be greater than the length of the first protrusion 411 protruding from the third surface 412a, and a certain space is formed between the first protrusion 411 and the bottom wall of the first recess 31, which can accommodate part of the colloid to reduce the amount of colloid that may flow to the central area 211.

[0115] The first protrusion 411 is formed on the first insulating member 41, and the first recess 31 is formed on the buffer member 30, which can appropriately increase the volume of the first insulating member 41 and reduce the volume of the buffer member 30, which is beneficial to increase the support area between the insulating member 40 and the battery cell 20, improve the support strength, reduce the deformation of the side of the multiple battery cells 20 close to the first box wall 11 during hoisting, and improve the assembly efficiency.

[0116] In some embodiments, the second surface 32a is attached to the third surface 412a.

[0117] The shapes of the second surface 32a and the third surface 412a match each other to improve the fit between the two.

[0118] Optionally, both the second surface 32a and the third surface 412a may be planes.

[0119] The second surface 32a and the third surface 412a may abut against each other, or may simply contact each other.

[0120] The second surface 32a is attached to the third surface 412a, which can compress the gap between the second surface 32a and the third surface 412a, which is beneficial to reducing the flowable area of ​​the colloid between the buffer 30 and the first insulating member 41, increasing the flow resistance of the colloid, further improving the sealing effect between the first insulating member 41 and the buffer 30, reducing the risk of the colloid overflowing to the central area 211, and improving the reliability of the battery cell 20.

[0121] In some embodiments, the outer surface of the first convex portion 411 is attached to the inner surface of the first concave portion 31. Thus, the gap between the mating interface of the first convex portion 411 and the first concave portion 31 can be reduced, which is conducive to further improving the sealing performance and reducing the risk of the colloid overflowing to the central area 211.

[0122] In some embodiments, there are multiple first recesses 31 and multiple first protrusions 411 , the multiple first recesses 31 are spaced apart along the second direction Z, and the multiple first protrusions 411 are inserted into the multiple first recesses 31 one by one.

[0123] The depths of the plurality of first recesses 31 along the first direction Y may be the same or different. The cross-sectional shapes and cross-sectional sizes of the plurality of first recesses 31 perpendicular to the first direction Y may be the same or different.

[0124] The plurality of first recesses 31 are arranged at intervals along the second direction Z, which can further extend the flow path of the colloid within a limited space, increase the flow resistance of the colloid, and further reduce the risk of the colloid overflowing to the central area 211 .

[0125] In some embodiments, the buffer member 30 includes a first main body portion 32 and a second protrusion 33, the first main body portion 32 extends along the second direction Z, the second protrusion 33 is connected to the end of the first main body portion 32 along the second direction Z, and protrudes from the second surface 32a of the first main body portion 32 facing away from the first box wall 11 in the direction away from the first box wall 11. Along the second direction Z, the second protrusion 33 is arranged on the outer side of at least a portion of the first insulating member 41 facing away from the central area 211.

[0126] A surface of the second protrusion 33 along the second direction Z facing away from the central area 211 may be flush with a surface of the first body portion 32 along the second direction Z facing away from the central area 211 .

[0127] In some examples, along the second direction Z, the second protrusion 33 may be entirely disposed on the outer side of the first insulating member 41 facing away from the central area 211 , and the surface of the second protrusion 33 facing away from the central area 211 along the second direction Z forms a step with the surface of the first insulating member 41 facing away from the central area 211 along the second direction Z.

[0128] In other examples, along the second direction Z, the second protrusion 33 may be disposed on a portion of the first insulating member 41 facing away from the outer side of the central area 211, and another portion of the first insulating member 41 may, for example, be flush with the second protrusion 33 or extend beyond the second protrusion 33 along the second direction Z toward the outer side away from the central area 211.

[0129] Along the second direction Z, the first protrusion 411 and the first recess 31 are both located on the inner side of the second protrusion 33 facing the central area 211. Along the first direction Y, the second protrusion 33 exceeds the first protrusion 411 and the first recess 31 in a direction away from the first box wall 11.

[0130] The second protrusion 33 can extend the distance between the first box wall 11 and the outermost gap between the buffer component 30 and the first insulating component 41 in the second direction Z in the first direction Y, which is beneficial to increase the difficulty of the colloid flowing to the gap between the buffer component 30 and the first insulating component 41, reduce the possibility of the colloid flowing into the gap between the buffer component 30 and the first insulating component 41, and reduce the risk of the colloid overflowing to the central area 211.

[0131] In some embodiments, the first insulating member 41 has a second recess 413 that is recessed along the second direction Z on the outer surface 41 a of the first insulating member 41 facing away from the central region 211 . The second protrusion 33 is at least partially accommodated in the second recess 413 and fits against the inner wall of the second recess 413 .

[0132] The second recess 413 extends to the end of the first insulating member 41 close to the first box wall 11 along the first direction Y. In other words, the second recess 413 is not only open toward the outside of the first insulating member 41 along the second direction Z, but also open toward the first box wall 11, so that the second protrusion 33 can be inserted into the second recess 413.

[0133] The second convex portion 33 may be entirely received in the second concave portion 413 , or only a portion of the second convex portion 33 may be received in the second concave portion 413 , and the other portion of the second convex portion 33 may extend out of the second concave portion 413 along the second direction Z, for example.

[0134] A step-shaped mating interface can be formed between the second protrusion 33 and the second recess 413, which is conducive to further extending the flow path of the colloid. The mating interface between the second protrusion 33 and the second recess 413 fits well, which is conducive to further increasing the flow resistance of the colloid, thereby reducing the risk of the colloid overflowing to the central area 211.

[0135] In some embodiments, along the second direction Z, the outer surface 41 a of the first insulating member 41 does not extend beyond the second protrusion 33 .

[0136] The second protrusion 33 has a fourth surface 33 a facing away from the central area 211 along the second direction Z. The outer surface 41 a of the first insulating member 41 may be flush with the fourth surface 33 a or may be recessed in the fourth surface 33 a toward the central area 211 .

[0137] If the outer surface 41a of the first insulating member 41 exceeds the second protrusion 33, when the colloid flows along the fourth surface 33a of the second protrusion 33 in the direction away from the first box wall 11, the portion of the first insulating member 41 that exceeds the second protrusion 33 will have a greater blocking effect on the colloid, preventing part of the colloid from continuing to flow along the first direction Y, and part of the colloid will gather in the second recess 413, easily flowing to the gap between the first insulating member 41 and the second protrusion 33, and then flowing to the central area 211 of the battery cell 20.

[0138] In the embodiment of the present application, the outer surface 41a of the first insulating member 41 is set to not exceed the second protrusion 33, which is conducive to the smooth flow of the colloid along the first direction Y from the fourth surface 33a of the second protrusion 33 to the outer surface 41a of the first insulating member 41, reducing the resistance of the colloid to flow on the outside of the first insulating member 41 and the buffer member 30, and reducing the possibility of the colloid flowing into the gap between the first insulating member 41 and the buffer member 30, thereby reducing the risk of the colloid flowing to the central area 211 of the battery cell 20.

[0139] In some embodiments, there are two first insulating members 41 , and the two first insulating members 41 are spaced apart along the second direction Z.

[0140] The first insulating member 41 extends along the first direction Y. The two first insulating members 41 may be respectively connected to two ends of the buffer member 30 along the second direction Z. Along the thickness direction X, the projections of the two first insulating members 41 may be respectively located within the projections of the two third edge regions 2123 .

[0141] Optionally, the two first insulating members 41 may be symmetrically arranged.

[0142] The two first insulating members 41 are both connected to the buffer member 30. The cooperation between the two first insulating members 41 and the buffer member 30 can prevent the colloid from flowing from both sides of the second direction Z to the central area 211, which is beneficial to reduce the possibility of the colloid flowing from all possible directions to the central area 211 and improve the effect of preventing glue overflow.

[0143] In some embodiments, the insulating member 40 includes a second insulating member 42 . The second insulating member 42 extends along the second direction Z. The second insulating member 42 and the buffer member 30 are spaced apart along the first direction Y.

[0144] The second insulating member 42 may be connected to the first insulating member 41 , or may be disposed separately from the first insulating member 41 .

[0145] The materials of the second insulating member 42 and the first insulating member 41 may be the same or different.

[0146] The second insulating member 42 may be one or more. The plurality of second insulating members 42 may be arranged along the first direction Y at intervals.

[0147] At least part of the second insulating member 42 may be adjacent to the edge of the first surface 21 away from the first box wall 11 along the first direction Y. Optionally, along the thickness direction X, the projection of at least part of the second insulating member 42 is located within the projection of the second edge area 2122 .

[0148] The first insulating member 41 , the second insulating member 42 and the buffer member 30 may be enclosed together to form a gap.

[0149] The second insulating member 42 can support at least part of two adjacent battery cells 20 along the first direction Y, increase the supporting area of ​​the insulating member 40, improve its supporting effect, reduce the extrusion deformation between two adjacent battery cells 20, and facilitate the hoisting of multiple battery cells 20 to improve its assembly efficiency.

[0150] In some embodiments, the second insulating member 42 is disposed on a side of the first insulating member 41 facing away from the first box wall 11 . Along the thickness direction X, the projection of the second insulating member 42 is located in the projection of the edge region 212 .

[0151] The second insulating member 42 can support the edges of two adjacent battery cells 20 away from the first box wall 11 along the first direction Y, and the insulating member 40 can provide relatively balanced support for the two adjacent battery cells 20, which is beneficial to improving the support effect. In addition, the insulating member 40 can also reduce the blocking effect of the central area 211 of the first surface 21 of the battery cell 20, which is beneficial to the convex deformation of the central area 211 and reduces the stress concentration phenomenon.

[0152] In some embodiments, along the arrangement direction of the first box wall 11 and the battery cells 20 , the buffer 30 is spaced apart from the first box wall 11 .

[0153] The arrangement direction of the first box wall 11 and the battery cells 20 is parallel to the first direction Y.

[0154] The buffer member 30 may be spaced apart from an edge of the first surface 21 close to the first box wall 11 .

[0155] A certain space may be formed between the buffer member 30 and the first box wall 11 , and the space may be used to accommodate part of the overflowed colloid, thereby reducing the possibility or amount of the colloid overflowing to other areas.

[0156] In some embodiments, a glue containing groove may be provided on a side of the buffer member 30 facing the first box wall 11 , and the glue containing groove is used to contain the colloid to reduce the possibility or amount of the colloid overflowing to other areas.

[0157] According to the second aspect of the present application, an embodiment of the present application further provides an electrical device, the electrical device comprising the battery device 100 provided in any embodiment of the present application, the battery device 100 being used to provide electrical energy.

[0158] The embodiment of the present application provides a battery device 100, which includes a box body 10, a plurality of battery cells 20, a buffer 30 and a first insulating member 41. The box body 10 includes a first box wall 11. The plurality of battery cells 20 are accommodated in the box body 10 and bonded to the first box wall 11 by colloid. The plurality of battery cells 20 are arranged along the thickness direction X of the battery cells 20, and the battery cells 20 have two first surfaces 21 opposite to each other along the thickness direction X, and the first surface 21 has a central area 211 and an edge area 212, and the edge area 212 surrounds the central area 211. The buffer 30 is arranged between two adjacent battery cells 20, and the two sides of the buffer 30 along the thickness direction X are respectively attached to the edge areas 212 of the two adjacent battery cells 20 close to the first box wall 11. The first insulating member 41 is arranged at a position corresponding to the edge area 212 between the two adjacent battery cells 20. The elastic modulus of the first insulating member 41 is greater than the elastic modulus of the buffer 30. The first insulating member 41 is a hard rubber strip, and the buffer member 30 can be made of microporous foamed polypropylene. The buffer member 30 is provided with a plurality of first recesses 31, and the first insulating member 41 is provided with a plurality of first protrusions 411, and the plurality of first protrusions 411 are respectively inserted into the plurality of first recesses 31. The end of the buffer member 30 along the second direction Z further includes a second protrusion 33, and the second protrusion 33 protrudes in a direction away from the first box wall 11.

[0159] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; 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 present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: include: The box body comprises a first box wall; A plurality of battery cells are contained in the box body and bonded to the first box wall, the plurality of battery cells are arranged along the thickness direction of the battery cells, the battery cells have two first surfaces opposite to each other along the thickness direction, the first surfaces have a central area and an edge area, and the edge area surrounds the central area; A buffer member is disposed between two adjacent battery cells, and the two sides of the buffer member along the thickness direction are respectively attached to the edge areas of the two adjacent battery cells close to the first box wall; as well as An insulating member, disposed between two adjacent battery cells, wherein the insulating member and the buffer member enclose a gap; The elastic modulus of the buffer member is greater than the elastic modulus of the insulating member.

2. The battery device according to claim 1, characterized in that: The first box wall is a wall portion of the box body in the first direction, the buffer member extends along the second direction, and the first direction, the second direction and the thickness direction are perpendicular to each other; The insulating member comprises a first insulating member, at least a portion of the first insulating member is located on a side of the buffer member away from the first box wall along the first direction, and along the thickness direction, a projection of the first insulating member is located within a projection of the edge region; The first insulating member is connected to the buffer member.

3. The battery device according to claim 2, characterized in that: One of the first insulating member and the buffer member is provided with a first recessed portion at a side facing the other member along the first direction, and the other member is provided with a first protruding portion, and the first protruding portion is inserted into the first recessed portion.

4. The battery device according to claim 3, characterized in that: The buffer member comprises a first main body portion, the first main body portion has a second surface facing away from the first box wall along the first direction, and the first recessed portion is recessed in the second surface; The first insulating member includes a second main body and the first protrusion. The second main body has a third surface facing the first box wall along the first direction. The first protrusion protrudes from the third surface in a direction close to the first box wall.

5. The battery device according to claim 4, characterized in that: The second surface is attached to the third surface.

6. The battery device according to claim 3, characterized in that: The outer surface of the first convex portion is in contact with the inner surface of the first concave portion.

7. The battery device according to claim 3, characterized in that: There are a plurality of the first recesses and a plurality of the first protrusions, the plurality of the first recesses are arranged at intervals along the second direction, and the plurality of the first protrusions are inserted into the plurality of the first recesses one by one.

8. The battery device according to claim 2, characterized in that: The buffer member includes a first main body portion and a second convex portion, the first main body portion extends along the second direction, the second convex portion is connected to an end portion of the first main body portion along the second direction, and protrudes from a second surface of the first main body portion facing away from the first box wall in a direction away from the first box wall; Along the second direction, the second protrusion is arranged on the outer side of at least a portion of the first insulating member facing away from the central area.

9. The battery device according to claim 8, characterized in that: The first insulating member is provided with a second recessed portion, and the second recessed portion is recessed along the second direction on the outer surface of the first insulating member facing away from the central area; The second convex portion is at least partially accommodated in the second concave portion and is in contact with an inner wall of the second concave portion.

10. The battery device according to claim 9, characterized in that: Along the second direction, the outer surface of the first insulating member does not extend beyond the second protrusion.

11. The battery device according to claim 2, characterized in that: There are two first insulating members, and the two first insulating members are spaced apart along the second direction.

12. The battery device according to claim 2, characterized in that: The insulating member includes a second insulating member extending along the second direction, and the second insulating member and the buffer member are spaced apart from each other along the first direction.

13. The battery device according to claim 12, characterized in that: The second insulating member is arranged on a side of the first insulating member facing away from the first box wall; Along the thickness direction, a projection of the second insulating member is located in a projection of the edge region.

14. The battery device according to claim 1, characterized in that: Along the arrangement direction of the first box wall and the battery cells, the buffer is spaced apart from the first box wall.

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

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