Battery device, energy storage equipment and power system

Abstract

A battery device, an energy storage device and a power system, the battery device comprises a connecting shell, a cover plate assembly, a first shell, a second shell and a battery cell, the first shell and the second shell are connected with a bottom plate of the connecting shell, a first plate, a second plate and a cover plate of the cover plate assembly, and the first shell and the second shell are oppositely arranged at an interval; the connecting shell, the first shell, the second shell and the cover plate jointly define a storage space; at least one of the first shell and the second shell comprises a frame and a wrapping piece, the frame is in a ring shape connected end to end, and the frame is connected with the bottom plate, the first plate, the second plate and the cover plate; a mounting space is defined by the frame, and the wrapping piece is arranged in the mounting space; the frame is provided with a containing groove which is communicated in the annular direction, the opening direction of the containing groove faces the installation space, and the peripheral edge of the wrapping piece extends into the containing groove and is connected with the frame; the battery cell is accommodated in the accommodating space, and the coating piece is elastically propped against the large surface of the battery cell. The battery device provided by the invention provides enough pre-tightening force for the battery cell.

Description

Technical Field

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

[0002] A battery device generally includes a shell and a battery cell, and the battery cell is contained in the shell. The thickness of the battery cell will change when the battery device is assembled, formed, and subsequently used. However, the current battery device is a fixed structure, which cannot provide sufficient pre-tightening force to the battery cell and cannot meet the working requirements of the battery device. Summary of the invention

[0003] The purpose of the present application is to provide a battery device, an energy storage device and a power system to solve the problem that the battery device cannot provide sufficient pre-tightening force to the battery cell.

[0004] To achieve the purpose of this application, this application provides the following technical solutions:

[0005] In a first aspect, the present application provides a battery device, including a connecting shell, a cover plate assembly, a first shell, a second shell and a battery cell, the connecting shell including a bottom plate, a first plate and a second plate, the first plate and the second plate are connected to the bottom plate, and the first plate and the second plate are both located on the same side of the bottom plate, and the first plate and the second plate are relatively spaced apart; the cover plate assembly includes a cover plate, the cover plate is connected to the first plate and the second plate, and is opposite to the bottom plate; the first shell and the second shell are all connected to the bottom plate, the first plate, the second plate and the cover plate, and the first shell and the second shell are relatively spaced apart, the connecting shell, the first shell, the second shell and the cover plate are The first shell and the second shell are enclosed together to form a storage space; at least one of the first shell and the second shell includes a frame and a covering, the frame is in a ring shape connected end to end, and the frame is connected to the bottom plate, the first plate, the second plate and the cover plate; the frame encloses an installation space, and the covering is arranged in the installation space; the frame has a receiving groove connected along the annular direction, the opening direction of the receiving groove is toward the installation space, and the edges of the covering extend into the receiving groove and are connected to the frame; the battery cell is accommodated in the storage space, and in the cross section along the height direction of the battery device, the battery cell is a runway-type wound battery cell, or a rectangular stacked battery cell, and the covering is elastically abutted against the large surface of the battery cell.

[0006] The battery device of the present application, by setting at least one of the first shell and the second shell to include a frame and a covering, can provide the battery cell with a larger expansion space when the thickness changes, compared with the side shell as a non-deformable structure. At the same time, the deformation of the covering can provide tension to react on the large surface of the battery cell, thereby providing the battery cell with sufficient pre-tightening force to meet the working requirements of the battery device.

[0007] In one embodiment, the accommodating groove includes a first groove and a second groove, the first groove is located inside the frame, the second groove connects the installation space and the first groove, the direction of the first groove toward the second groove is a first direction, and in a second direction perpendicular to the first direction, the gap size of the first groove is larger than the gap size of the second groove; the covering component includes a first part and a second part, the second part is connected to the four peripheral edges of the first part, in the second direction, the thickness dimension of the second part is larger than the thickness dimension of the first part, and the thickness dimension of the second part is larger than the gap dimension of the second groove, the second part is accommodated in the first groove, and at least part of the first part is accommodated in the second groove.

[0008] By arranging the accommodating groove to include the first groove and the second groove, and the covering member to include the first part and the second part, the connection between the covering member and the frame can be realized with a simple structure, and the structure is simple and easy to realize.

[0009] In one embodiment, the frame includes a first frame, a second frame and a first connecting frame, the first frame and the second frame are arranged relative to each other in the second direction, the first frame is closer to the storage space than the second frame, the first connecting frame connects one end of the first frame and the second frame respectively away from the installation space, the surface of the first frame facing the second frame and / or the surface of the second frame facing the first frame is recessed in an area close to the first connecting frame, so that the first frame, the second frame and the first connecting frame are jointly enclosed to form the first groove, and the gap between the non-recessed areas of the respective opposite surfaces of the first frame and the second frame forms the second groove.

[0010] By setting the frame to include a first frame, a second frame and a first connecting frame, a simple structure can be installed with the covering member and provide a stable supporting foundation for the covering member, and the structure is simple.

[0011] In one embodiment, the first connecting frame includes a first outer surface facing away from the accommodating groove, and the frame also includes a mounting frame, which protrudes from the first outer surface in the first direction, and the mounting frame is connected and fixed to the connecting shell and the cover plate.

[0012] By arranging the frame to also include an installation frame, the installation frame protrudes from the first outer surface of the first connection frame facing away from the accommodating groove, thereby facilitating the connection and assembly of the frame with the connection shell and the cover plate.

[0013] In one embodiment, the first outer surface is an arc surface, the first outer surface is smoothly connected to a surface of the first frame facing away from the second frame, and a surface of the installation frame facing the storage space is connected and fixed to the connecting shell and the cover plate.

[0014] By setting the first outer surface as an arc surface, when the connecting shell and the cover plate are connected to the surface of the installation frame facing the storage space, the first outer surface can guide the connecting shell and the cover plate to ensure accurate positioning.

[0015] In one implementation, the installation frame is connected to the first connection frame.

[0016] With such arrangement, the frame has a simple structure, good self-stability, and is also convenient for connection with the connecting shell and the cover plate.

[0017] In one embodiment, the frame further includes a second connecting frame, which is connected to an end of the second frame away from the first connecting frame. The installation frame is located on a side of the second frame facing away from the first frame, and the installation frame is connected to the second connecting frame.

[0018] By setting a second connecting frame connected to an end of the second frame away from the first connecting frame, the installation frame is located on the side of the second frame facing away from the first frame, and the frame can be installed with the covering component while the frame is connected to the connecting shell and the cover plate.

[0019] In one embodiment, the second connection frame includes a second outer surface facing the installation space, the second outer surface is an arc surface, and the second outer surface is smoothly connected to a surface of the second frame facing the first frame.

[0020] By setting the second outer surface of the second connecting frame facing the installation space to be an arc surface, when the covering is squeezed by the expansion force of the battery cell, the first part of the covering will contact the second outer surface, avoiding the first part directly contacting the sharp corner of the second frame at the end away from the first connecting frame and damaging the first part, thereby increasing the service life of the covering.

[0021] In one implementation, a portion of the first frame corresponding to the first groove protrudes in a direction away from the second frame, and / or a portion of the second frame corresponding to the first groove protrudes in a direction away from the first frame.

[0022] By arranging the portion of the first frame corresponding to the first groove to protrude in a direction away from the second frame, and / or the portion of the second frame corresponding to the first groove to protrude in a direction away from the first frame, the structural strength of the frame can be increased, and a larger first groove space can be provided to accommodate a larger second part, thereby improving the connection strength between the cover and the frame.

[0023] In one implementation, the first frame protrudes toward the installation space relative to the second frame.

[0024] With such a configuration, the contact area between the second frame and the first part of the covering is smaller than the contact area between the first frame and the first part of the covering, which can make the covering more easily deformed toward the second frame. The tension of the deformation of the covering applies an inward pulling force in the thickness direction of the battery cell, thereby providing a pre-tightening force to the battery cell to meet the working requirements of the battery device.

[0025] In one implementation, the first frame includes a plurality of connection segments, the plurality of connection segments are sequentially arranged along a circumferential direction, and each of the connection segments is connected to the second frame.

[0026] By configuring the first frame to include a plurality of connection segments sequentially arranged along the annular direction, the number of connection segments can be selected according to actual needs and the interval between two adjacent connection segments can be controlled, thereby saving costs.

[0027] In one embodiment, the frame is an integrated structure.

[0028] The frame is an integrated structure made by an integrated molding process, and the frame has high structural strength and is easy to install.

[0029] In one embodiment, the inner wall surface of the connecting shell is provided with a plurality of protrusions arranged at intervals.

[0030] By providing the inner wall surface of the connecting shell with multiple protrusions arranged at intervals, the battery cells in the storage space can be positioned and limited, preventing the battery cells from moving around in the width and height directions, ensuring the accurate relative position of the battery cells and the covering, and allowing the covering to elastically abut against the large surface of the battery cells.

[0031] In a second aspect, the present application further provides an energy storage device, comprising a battery device and a fixing plate as described in any one of the various embodiments of the first aspect, wherein the fixing plate is arranged on at least one side in a thickness direction of the battery device.

[0032] The energy storage device in the present application provides a fixing plate on at least one side of the battery device in the thickness direction. In addition to the preload force provided by the covering member, the fixing plate can provide additional preload force to the battery cell in the thickness direction to meet the working requirements of the energy storage device.

[0033] In one embodiment, there are multiple battery devices, and the multiple battery devices are arranged in sequence along the thickness direction; the fixing plate is arranged on the outermost side of the battery devices in the thickness direction, and / or the fixing plate is arranged between two adjacent battery devices; at least one of the fixing plates is movable in the thickness direction of the battery device.

[0034] By setting a fixing plate at the outermost side in the thickness direction of the entire battery device, and / or setting a fixing plate between two adjacent battery devices, in addition to the preload force provided by the covering, the fixing plate can provide additional preload force to the battery cell to meet the working requirements of the battery device.

[0035] In a third aspect, the present application further provides an electric power system, comprising an electric device and a battery device as described in any one of the various embodiments of the first aspect or an energy storage device as described in any one of the various embodiments of the second aspect, wherein the battery device or the energy storage device supplies power to the electric device.

[0036] The power system of the present application adopts the battery device or energy storage device in the embodiment of the present application. The battery device or energy storage device can provide sufficient pre-tightening force to the battery cell to meet the working requirements of the battery device or energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 is a perspective view of a battery device according to an embodiment;

[0039] Figure 2 is an exploded schematic diagram of a battery device according to an embodiment;

[0040] Figure 3 is a partial cross-sectional schematic diagram of a frame and a covering member of an embodiment;

[0041] Figure 4 is a partial cross-sectional schematic diagram of a frame and a covering member of another embodiment;

[0042] Figure 5 is a partial cross-sectional schematic diagram of a frame and a covering member of yet another embodiment;

[0043] Figure 6 It is a partial cross-sectional schematic diagram of a frame and a covering member of yet another embodiment.

[0044] Description of reference numerals:

[0045] 100-battery device;

[0046] 10-connecting shell, 11-bottom plate, 12-first plate, 13-second plate, 14-protrusion;

[0047] 20-cover plate assembly, 21-cover plate, 22-connecting piece, 23-pole;

[0048] 31-first shell, 32-second shell, 33-frame, 331-installation space, 332-accommodation groove, 3321-first groove, 3322-second groove, 333-first frame, 334-second frame, 335-first connecting frame, 3351-first outer surface, 336-installation frame, 337-second connecting frame, 3371-second outer surface, 34-covering member, 341-first part, 342-second part;

[0049] 40- Storage space;

[0050] 50-battery cell;

[0051] X is the width direction of the battery device, Y is the thickness direction of the battery device, and Z is the height direction of the battery device. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only 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.

[0053] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there can be a central component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there can be a central component at the same time.

[0054] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in this application and in the specification are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this application includes any and all combinations of one or more of the related listed items.

[0055] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0056] Please refer to Figure 1 and Figure 2 The embodiment of the present application provides a battery device 100, including a connection shell 10, a cover plate assembly 20, a first shell 31, a second shell 32 and a battery cell 50. The overall shape of the assembled battery device 100 is roughly a rectangular parallelepiped. For the convenience of description, the XYZ direction is defined, where the X direction is the width direction of the battery device 100, the Y direction is the thickness direction of the battery device 100, and the Z direction is the height direction of the battery device 100.

[0057] The connecting shell 10 includes a bottom plate 11, a first plate 12 and a second plate 13. The first plate 12 and the second plate 13 are connected to the bottom plate 11, and the first plate 12 and the second plate 13 are both located on the same side of the bottom plate 11, and the first plate 12 and the second plate 13 are relatively spaced apart.

[0058] The bottom plate 11, the first plate 12 and the second plate 13 are all roughly flat plates. The bottom plate 11 extends in the X direction. The first plate 12 and the second plate 13 are respectively connected to the two side edges of the bottom plate 11 in the X direction. The first plate 12 and the second plate 13 extend in the Z direction. The connecting shell 10 can be an integrated structure, that is, the bottom plate 11, the first plate 12 and the second plate 13 are an integrated structure. For example, a long plate can be used to form the connecting shell 10 by bending, or other processes can be used to form it, without limitation. The connecting shell 10 can also be connected and fixed by welding, screwing, riveting and other processes.

[0059] The cover plate assembly 20 includes a cover plate 21, which is connected to the first plate 12 and the second plate 13 and is opposite to the bottom plate 11. The cover plate 21 can be made of aluminum, steel, etc., and the cover plate 21 made of aluminum is generally called a plain aluminum sheet. The cover plate 21 is also generally in the shape of a flat plate, which extends along the X direction. The two end edges of the cover plate 21 in the X direction are respectively connected to the first plate 12 and the second plate 13, and the connection method can be welding, screw connection, riveting, etc.

[0060] The cover plate assembly 20 also includes an insulating member (not shown in the figure), a pole 23, a connecting piece 22, a top patch (not shown in the figure), etc. The insulating member is arranged on the surface of the cover plate 21 facing the bottom plate 11, and the cover plate 21 and the insulating member are provided with holes, and the pole 23 passes through the hole, so that one end of the pole 23 is located at the insulating member and the other end extends out of the cover plate 21. The connecting piece 22 connects the end of the pole 23 located at the insulating member and the pole ear of the battery cell 50. The top patch is attached to the surface of the cover plate 21 facing away from the bottom plate 11, and the pole 23 is exposed. The connecting piece 22 and the pole 23 are used to transmit electrical energy, the insulating member is used to separate the connecting piece 22 and the cover plate 21 to avoid short circuit, and the top patch plays an insulating protection role. Positive and negative terminals can be provided on a cover plate assembly 20 at the same time, specifically, the pole 23 includes a positive pole 23 and a negative pole 23, the connecting piece 22 includes a positive connecting piece 22 and a negative connecting piece 22, the positive pole 23 and the negative pole 23 are arranged at intervals on the same cover plate 21, the positive connecting piece 22 is connected to the positive pole 23 and the positive pole ear, and the negative connecting piece 22 is connected to the negative pole 23 and the negative pole ear. The specific structure of the cover plate assembly 20 can refer to any feasible solution, and the embodiment of the present application is not limited.

[0061] The first shell 31 and the second shell 32 are connected to the bottom plate 11, the first plate 12, the second plate 13 and the cover plate 21, and the first shell 31 and the second shell 32 are relatively spaced apart, and the connecting shell 10, the first shell 31, the second shell 32 and the cover plate 21 together enclose a storage space 40.

[0062] The first shell 31 and the second shell 32 are roughly plate-shaped. The first shell 31 and the second shell 32 are relatively spaced apart in the Y direction. The first shell 31 and the second shell 32 are respectively connected to the two side edges of the connecting shell 10 and the cover plate 21 in the Y direction, thereby jointly enclosing a storage space 40.

[0063] The battery cell 50 is accommodated in the storage space 40. The battery cell 50 is also roughly in the shape of a rectangular parallelepiped, and its width, thickness and height directions are the same as the corresponding directions of the aforementioned battery device 100. The battery cell 50 may include a bare battery cell 50, a pole ear, a Mylar film, etc. The bare battery cell 50 is connected to a pole ear at one end facing the cover assembly 20, and the pole ear is connected to the aforementioned connecting piece 22. The pole ear includes a positive pole ear and a negative pole ear, both of which can be arranged at the same end to be connected to the same cover assembly 20. The Mylar film is coated on the other surfaces of the bare battery cell 50 except the end face facing the top cover. The Mylar film plays a role in protecting the bare battery cell 50. The battery cell 50 may include one or more bare batteries 50. When there are multiple bare batteries 50, the multiple bare batteries 50 are arranged side by side and connected to the same cover assembly 20. The specific structure of the battery cell 50 can refer to any feasible scheme, and the embodiment of the present application is not limited.

[0064] The battery cell 50 is a wound battery cell 50, and in the cross section along the Z direction (i.e., the cross section is perpendicular to the Z direction), the cross section of the battery cell 50 is a racetrack shape; or, the battery cell 50 is a stacked battery cell 50, and in the cross section along the Z direction, the cross section of the battery cell 50 is a rectangular. All of the above methods are possible and there is no specific limitation.

[0065] In the embodiment of the present application, at least one of the first shell 31 and the second shell 32 includes a frame 33 and a covering 34. One of the first shell 31 and the second shell 32 may include a frame 33 and a covering 34, and the other may be only a flat plate. The side shell of the flat plate may be an integrated structure with the connecting shell 10, or may be connected and fixed to the connecting shell 10 by welding, screwing, riveting, etc. The first shell 31 and the second shell 32 may also both include a frame 33 and a covering 34, and the structures of the two are basically the same.

[0066] Among them, the frame 33 serves as a supporting base, and the covering member 34 is installed on the frame 33. The frame 33 can be made of metal, which can be the same as or different from the material of the connecting shell 10 and the cover plate 21. The material of the frame 33 can be AL3003 (aluminum alloy with manganese as the main alloying element), SPCC (cold-rolled carbon steel sheet), SUS304 (304 stainless steel), etc. The covering member 34 is made of elastic material, which can provide elastic tension after deformation and can have the ability to recover as before. At the same time, the covering member 34 also has the performance of resistance to electrolyte corrosion. The specific material of the covering member 34 can be EPDN (ethylene propylene diene monomer rubber), fluororubber, PFA (tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer), etc.

[0067] Please refer to Figure 2 and Figure 3 The frame 33 is in a ring shape with the ends connected, and the frame 33 is connected to the bottom plate 11, the first plate 12, the second plate 13 and the cover plate 21. The frame 33 encloses and forms an installation space 331, and the cover 34 is arranged in the installation space 331. The frame 33 has a receiving groove 332 connected in an annular direction, and the opening direction of the receiving groove 332 faces the installation space 331. The edges of the covering member 34 extend into the receiving groove 332 and are connected to the frame 33. The covering member 34 elastically abuts against the large surface of the battery cell 50.

[0068] The frame 33 is roughly formed into a "mouth"-shaped structure, which includes four frames extending roughly in a straight line, the four frames are sequentially connected end to end to form a ring, and the adjacent frames are roughly perpendicular to each other, and the four frames are roughly located in the same plane. The area enclosed by the four frames is the installation space 331. The four frames are connected to the bottom plate 11, the first plate 12, the second plate 13 and the cover plate 21 in a one-to-one manner, and the connection method can be welding, screwing, riveting, etc., without limitation.

[0069] The shape of the covering member 34 when flattened matches the shape of the space enclosed by the frame 33, that is, the covering member 34 when flattened is roughly rectangular, and its thickness direction is the Y direction. The edges of the covering member 34 and the frame 33 can be connected by snapping or any other feasible connection method such as bonding, without limitation.

[0070] Combination Figure 1 The large surface of the battery cell 50 is any one of the two opposite surfaces of the battery cell 50 in the Y direction. When the battery cell 50 expands, it mainly expands in the Y direction, and expands less in the X direction and the Z direction. When the battery cell 50 expands in the Y direction, the edges of the covering 34 are connected and fixed to the frame 33. The battery cell 50 can expand to the installation space 331 enclosed by the frame 33, and further expand to the side of the frame 33 facing away from the connection shell 10. The battery cell 50 squeezes the covering 34 so that the part of the covering 34 that contacts the large surface of the battery cell 50 deforms outward in the Y direction. The tension of the deformation of the covering 34 applies an inward pulling force to the battery cell 50 in the Y direction, thereby providing the battery cell 50 with a pre-tightening force.

[0071] Please refer to Figure 1 and Figure 2 Taking the structure that both the first shell 31 and the second shell 32 include a frame 33 and a covering 34 as an example, the assembly process of the battery device 100 is roughly as follows: connect the cover plate assembly 20 to the battery cell 50, specifically connect the pole 23 to the pole ear through the connecting sheet 22. When the battery cell 50 has two bare battery cells 50, the two bare battery cells 50 can be laid flat on the same plane and connected to the cover plate assembly 20, and then the two bare battery cells 50 are combined. Specifically, the two laid bare battery cells 50 are combined into a whole side by side along the Y direction and coated with hot-melt Mylar film; then the battery cell 50 and the cover plate assembly 20 are installed in the connecting shell 10, and the cover plate 21 of the cover plate assembly 20 is connected to the connecting shell 10; then the first shell 31 and the second shell 32 are installed; finally, the outer side of the connecting shell 10, the first shell 31 and the second shell 32 can be coated with an outer film, and a top patch is attached to the cover plate 21, and the outer film plays a protective role.

[0072] In summary, the battery device 100 of the embodiment of the present application, by setting at least one of the first shell 31 and the second shell 32 to include a frame 33 and a covering 34, can provide the battery cell 50 with a larger expansion space when the thickness changes compared to the side shell as a non-deformable structure. At the same time, the deformation of the covering 34 can provide tension to react on the large surface of the battery cell 50, thereby providing the battery cell 50 with sufficient pre-tightening force to meet the working requirements of the battery device 100.

[0073] In one embodiment, please refer to Figure 2 and Figure 3The receiving groove 332 includes a first groove 3321 and a second groove 3322. The first groove 3321 is located inside the frame 33, and the second groove 3322 communicates with the installation space 331 and the first groove 3321. The direction from the first groove 3321 to the second groove 3322 is a first direction, and in a second direction perpendicular to the first direction, the gap size of the first groove 3321 is greater than the gap size of the second groove 3322.

[0074] The covering member 34 includes a first portion 341 and a second portion 342, wherein the second portion 342 is connected to the four peripheral edges of the first portion 341. In the second direction, the thickness of the second portion 342 is greater than the thickness of the first portion 341, and the thickness of the second portion 342 is greater than the gap size of the second groove 3322. The second portion 342 is received in the first groove 3321, and at least a portion of the first portion 341 is received in the second groove 3322.

[0075] In this embodiment, at the connection between the frame 33 and the first plate 12 and the second plate 13, the first direction may be the X direction, or may have a certain angle with the X direction; at the connection between the frame 33 and the bottom plate 11 and the cover plate 21, the first direction may be the Z direction, or may have a certain angle with the Z direction. The second direction may be the Y direction, or may have a certain angle with the Y direction. Exemplarily, taking the first direction as the X direction or the Z direction, and the second direction as the Y direction as an example, the gap size between the first groove 3321 and the second groove 3322 refers to the size in the Y direction; when the covering member 34 is in a flattened state, the plane where the covering member 34 is located is the plane formed by the X direction and the Z direction, and its thickness is the size in the Y direction.

[0076] The first groove 3321 has a larger gap size to accommodate the thicker second portion 342. The second groove 3322 has a smaller gap size to accommodate the first portion 341. The thickness of the second portion 342 is larger than the gap size of the second groove 3322, so that the second portion 342 cannot exit through the second groove 3322.

[0077] Optionally, the thickness of the first portion 341 is 0.1 mm-2 mm, specifically 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, etc., without limitation. Optionally, the thickness of the second portion 342 is 0.1 mm-3 mm thicker than the thickness of the first portion 341. In a specific embodiment, the thickness of the first portion 341 is 0.4 mm, and the thickness of the second portion 342 is 0.6 mm.

[0078] The covering member 34 may be an integral structure, for example, the first portion 341 and the second portion 342 may be an integral structure formed by injection molding. The covering member 34 may also be a split structure formed as a whole by connection, for example, the first portion 341 and the second portion 342 may be formed as a whole by bonding, hot-melt connection, etc.

[0079] The accommodating groove 332 is used for snap-fit ​​connection with the covering member 34, that is, after the second part 342 is accommodated in the first groove 3321, the covering member 34 pulls the second part 342 when deforming, and the second part 342 will snap-fit ​​with the side wall of the second groove 3322 toward the opening of the first groove 3321 and will not exit through the second groove 3322, thereby realizing the snap-fit ​​connection between the covering member 34 and the frame 33.

[0080] By providing the receiving groove 332 including the first groove 3321 and the second groove 3322 , and the covering member 34 including the first portion 341 and the second portion 342 , the connection between the covering member 34 and the frame 33 can be achieved with a simple structure, which is simple and easy to achieve.

[0081] In one embodiment, please refer to Figure 2 and Figure 3 The frame 33 includes a first frame 333, a second frame 334 and a first connecting frame 335. The first frame 333 and the second frame 334 are arranged relatively spaced in the Y direction, and the first frame 333 is closer to the storage space 40 than the second frame 334. The first connecting frame 335 connects one end of the first frame 333 and the second frame 334, respectively, away from the installation space 331. The surface of the first frame 333 facing the second frame 334 and / or the surface of the second frame 334 facing the first frame 333 are recessed in an area close to the first connecting frame 335, so that the first frame 333, the second frame 334 and the first connecting frame 335 are enclosed together to form a first groove 3321, and the gap between the areas where the surfaces of the first frame 333 and the second frame 334 are not recessed respectively on the opposite sides forms a second groove 3322.

[0082] The first frame 333, the second frame 334 and the first connecting frame 335 can all be in a ring shape connected end to end along the ring direction of the frame 33, or one or both of them can be a multi-stage structure arranged in sequence along the ring direction, without limitation. In a cross section at any position of the frame 33, the first frame 333, the second frame 334 and the first connecting frame 335 generally form a "C"-shaped structure, and the three together enclose a receiving groove 332.

[0083] One of the first frame 333 and the second frame 334 may be recessed to form the first groove 3321, and correspondingly, the second portion 342 of the cover 34 protrudes from one side surface of the first portion 341 in the second direction to correspond to the first groove 3321. Alternatively, both the first frame 333 and the second frame 334 may be recessed to form the first groove 3321, and correspondingly, the second portion 342 protrudes from both side surfaces of the first portion 341 in the second direction to correspond to the first groove 3321.

[0084] The first connecting frame 335 is used to connect the first frame 333 and the second frame 334 to form a whole, and close the side of the first groove 3321 facing away from the second groove 3322, so that the first groove 3321 can be connected with the outside (the part outside the interior of the frame 33) only through the second groove 3322, so that when the covering part 34 is not deformed or retracted after deformation, the second part 342 is in the first groove 3321 and does not move to other positions, thereby ensuring the stability of the structure.

[0085] Optionally, the first frame 333, the first connecting frame 335 and the second frame 334 may be an integrated structure, and the assembly method of the overall "C"-shaped structure and the covering member 34 may be achieved by bending one of the first frame 333 and the second frame 334. Specifically, an intermediate member is first made, the shape of the intermediate member in the cross section at any position is "L"-shaped, and the "L"-shaped structure has a surface near the junction of the two sections pre-formed with a depression, and then the second part 342 of the covering member 34 is placed in one of the depressions, and then one of the two sections of the "L" shape is bent to form a "C"-shaped structure, and the pre-formed depressions are opposite to each other and form the first groove 3321.

[0086] Optionally, the first frame 333, the first connecting frame 335 and the second frame 334 may be an integrated structure of two of them and form a whole with the third one by welding, screwing, clamping, etc., or the three may be independent and form a whole by welding, screwing, clamping, riveting, etc., without limitation. When assembling with the covering member 34, the second part 342 may be placed in the first groove 3321 first and then the first frame 333, the first connecting frame 335 and the second frame 334 may be connected.

[0087] By setting the frame 33 to include a first frame 333, a second frame 334 and a first connecting frame 335, a simple structure can be installed with the covering member 34 and provide a stable supporting foundation for the covering member 34, and the structure is simple.

[0088] In one embodiment, reference Figure 2 and Figure 3The first connection frame 335 includes a first outer surface 3351 facing away from the receiving groove 332. The frame 33 also includes a mounting frame 336. The mounting frame 336 protrudes from the first outer surface 3351 in the X direction. The mounting frame 336 is connected and fixed to the connection shell 10 and the cover plate 21.

[0089] Optionally, the first frame 333, the first connecting frame 335, the second frame 334 and the installation frame 336 can be an integrated structure made by an integrated molding process. Alternatively, the first frame 333, the first connecting frame 335, the second frame 334 and the installation frame 336 can also be an integrated structure of two of them, and they are formed into a whole with the other two by welding, screwing, clamping, etc. Alternatively, the first frame 333, the first connecting frame 335, the second frame 334 and the installation frame 336 can also be an integrated structure of three of them, and they are formed into a whole with the fourth by welding, screwing, clamping, etc., or the four can be independent and formed into a whole by welding, screwing, clamping, etc., without limitation.

[0090] Optionally, the mounting frame 336 is closer to the second frame 334 than the first frame 333, so that in the cross section of the frame 33, the contour line of the first outer surface 3351 has a longer path, so that the first outer surface 3351 can abut against the connecting shell 10 and the cover plate 21 to play a limiting role.

[0091] Optionally, the connection method of the installation frame 336 to the connection shell 10 and the cover plate 21 can be welding, screwing, riveting, etc., without limitation. Exemplarily, the installation frame 336 is welded and fixed to the connection shell 10 and the cover plate 21, and the installation frame 336 protrudes from the first outer surface 3351, thereby providing a welding position, which can facilitate the welding operation, and the molten metal after welding will not flow into the receiving groove 332, avoiding the high temperature from affecting the covering member 34.

[0092] The frame 33 further includes a mounting frame 336 , which protrudes from the first outer surface 3351 of the first connecting frame 335 facing away from the receiving groove 332 , so as to facilitate the connection and assembly of the frame 33 with the connecting shell 10 and the cover plate 21 .

[0093] In one embodiment, reference Figures 1 to 3 The first outer surface 3351 is an arc surface, the first outer surface 3351 is smoothly connected to the surface of the first frame 333 facing away from the second frame 334, and the surface of the mounting frame 336 facing the storage space 40 is connected and fixed to the connecting shell 10 and the cover plate 21.

[0094] The first outer surface 3351 is an outwardly convex surface. In the cross section of the frame 33 , the contour line of the first outer surface 3351 is an arc line. The first outer surface 3351 is tangent to the surface of the first frame 333 facing away from the second frame 334 .

[0095] Optionally, the mounting frame 336 may be directly connected to the first outer surface 3351, in which case the surface of the mounting frame 336 facing the storage space 40 is connected to the first outer surface 3351. Alternatively, the first outer surface 3351 is not directly connected to the mounting frame 336, but only the mounting frame 336 protrudes from the first outer surface 3351.

[0096] The connection shell 10 and the cover plate 21 are both connected and fixed to the surface of the mounting frame 336 connected thereto, which faces the storage space 40. That is, in the orthographic projection in the Y direction, the mounting frame 336 covers at least part of the connection shell 10 and the cover plate 21. During installation, the frame 33 is relatively moved with the connection shell 10 and the cover plate 21, and the connection shell 10 and the cover plate 21 can first contact with the first outer surface 3351. Since the first outer surface 3351 is an arc surface, the connection shell 10 and the cover plate 21 will slide along the first outer surface 3351 and contact with the surface of the mounting frame 336 facing the storage space 40, completing accurate positioning, and then the mounting frame 336 is connected with the connection shell 10 and the cover plate 21, for example, by welding and fixing.

[0097] By setting the first outer surface 3351 as an arc surface, when the connection shell 10 and the cover plate 21 are connected to the surface of the installation frame 336 facing the storage space 40, the first outer surface 3351 can guide the connection shell 10 and the cover plate 21 to ensure accurate positioning.

[0098] In one embodiment, reference Figure 2 and Figure 3 , the mounting frame 336 is connected to the first connecting frame 335. In this way, the frame 33 has a simple structure, good self-stability, and is also convenient for connection with the connecting shell 10 and the cover plate 21.

[0099] Optionally, the first frame 333, the first connection frame 335 and the installation frame 336 are an integrated structure, and are formed as a whole with the second frame 334 by welding, screwing, clamping, etc., and the connection position of the second frame 334 is located outside the installation space 331. When assembling with the covering 34, the second part 342 can be first placed in the recess formed by the first frame 333, and then the second frame 334 is connected. When the battery device 100 is assembled, after the assembly between the battery cell 50, the cover plate 21 and the connection shell 10 is completed, the integrated structure of the first frame 333, the first connection frame 335 and the installation frame 336 is first connected to the connection shell 10 and the cover plate 21, and then the covering 34 is installed, and then the second frame 334 is installed. The first frame 333, the first connecting frame 335 and the installing frame 336 can isolate the second frame 334 from the storage space 40 of the battery device 100 to prevent the second frame 334 from affecting the battery cell 50 when being connected (such as high-temperature molten metal during welding). The second frame 334 cooperates with the first frame 333, the first connecting frame 335 and the installing frame 336 to clamp the covering 34.

[0100] In one embodiment, please refer to Figure 2 and Figure 3 The mounting frame 336, the first frame 333, the second frame 334 and the first connecting frame 335 are an integrated structure, and the surface of the mounting frame 336 facing away from the storage space 40 is flush with the surface of the second frame 334 facing away from the first frame 333, which can make the structure simpler. Further, the two flush surfaces are both planes and are located in the same plane.

[0101] Further, the surface of the mounting frame 336 facing the storage space 40 is flush with the non-depressed area of ​​the surface of the second frame 334 facing the first frame 333. Further, the two flush surfaces are both planes and are located in the same plane. In other words, the second frame 334 and the mounting frame 336 are roughly a flat plate structure. The frame 33 in this embodiment can be formed by bending the aforementioned intermediate member, and the cross-sectional shape of the intermediate member is roughly "T" shaped.

[0102] In one embodiment, reference Figure 4 ,and Figure 3 The illustrated embodiments are basically the same, and the frame 33 also includes a first frame 333, a first connecting frame 335, a second frame 334 and an installation frame 336. The difference is that the frame 33 also includes a second connecting frame 337, and the second connecting frame 337 is connected to an end of the second frame 334 away from the first connecting frame 335. The installation frame 336 is located on the side of the second frame 334 facing away from the first frame 333, and the installation frame 336 is connected to the second connecting frame 337.

[0103] Optionally, the second connection frame 337, the installation frame 336 and the second frame 334 can be an integrated structure made by an integrated molding process. The second connection frame 337, the installation frame 336 and the second frame 334 can also be an integrated structure of two of them, and form a whole with the third one through welding, screwing, clamping, etc., or the three can be independent and form a whole through welding, screwing, clamping, etc., without limitation.

[0104] Optionally, the installation frame 336 is in contact with the surface of the second frame 334 facing away from the first frame 333 , or there is a gap between the installation frame 336 and the surface of the second frame 334 facing away from the first frame 333 . All of the above methods are possible and are not specifically limited.

[0105] Optionally, there is a gap between the mounting frame 336 and the surface of the second frame 334 facing away from the first frame 333, and the size of the gap in the Y direction is 0 mm-0.05 mm, and can be specifically 0.01 mm, 0.015 mm, 0.02 mm, 0.025 mm, 0.03 mm, 0.035 mm, 0.04 mm, 0.045 mm, 0.05 mm, etc., without specific limitation. In a specific embodiment, the size of the gap in the Y direction is 0.05 mm.

[0106] Optionally, the second frame 334, the second connecting frame 337 and the installation frame 336 may be in a ring shape connected end to end along the annular direction of the frame 33, or one or both of them may be a multi-segment structure arranged in sequence along the annular direction, without limitation. In a cross section at any position of the frame 33, the second frame 334, the second connecting frame 337 and the installation frame 336 roughly form a "C"-shaped structure, and the opening direction of the "C"-shaped structure is opposite to that of the "C"-shaped structure roughly formed by the first frame 333, the second frame 334 and the first connecting frame 335. In a cross section at any position of the frame 33, the first frame 333, the first connecting frame 335, the second frame 334, the second connecting frame 337 and the installation frame 336 generally form an "S" shape.

[0107] The "S"-shaped structure of the above-mentioned frame 33 can also be achieved by bending. During the bending process, the second part 342 of the covering member 34 is first placed in the recesses of the first frame 333 and the second frame 334, and then the first frame 333 is bent relative to the second frame 334, so that the covering member 34 can be installed.

[0108] By setting a second connecting frame 337 connected to the end of the second frame 334 away from the first connecting frame 335, the installation frame 336 is located on the side of the second frame 334 facing away from the first frame 333, and the frame 33 can be installed with the cover 34 while the frame 33 is connected to the connecting shell 10 and the cover plate 21.

[0109] In one embodiment, reference Figure 4 The second connection frame 337 includes a second outer surface 3371 facing the installation space 331 , the second outer surface 3371 is an arc surface, and the second outer surface 3371 is smoothly connected to the surface of the second frame 334 facing the first frame 333 .

[0110] Optionally, the second outer surface 3371 is tangent to the surface of the second frame 334 facing the first frame 333. In this way, the second frame 334 will not interfere with the covering member 34, which facilitates the assembly of the covering member 34 and the frame 33.

[0111] Optionally, the second outer surface 3371 is smoothly connected to the surface of the mounting frame 336 facing away from the second frame 334. The second outer surface 3371 is a convex surface.

[0112] By setting the second outer surface 3371 of the second connecting frame 337 facing the installation space 331 to be an arc surface, when the covering member 34 is squeezed by the expansion force of the battery cell 50, the first portion 341 of the covering member 34 will contact the second outer surface 3371, avoiding the first portion 341 from directly contacting the sharp corner of the end of the second frame 334 away from the first connecting frame 335 and crushing the first portion 341, thereby improving the service life of the covering member 34.

[0113] In one embodiment, reference Figure 5 , the portion of the first frame 333 corresponding to the first groove 3321 protrudes in a direction away from the second frame 334, while the portion of the second frame 334 corresponding to the first groove 3321 does not protrude in a direction away from the first frame 333. In another embodiment, please refer to Figure 3 , the portion of the first frame 333 corresponding to the first groove 3321 protrudes in a direction away from the second frame 334, and the portion of the second frame 334 corresponding to the first groove 3321 protrudes in a direction away from the first frame 333. In another embodiment, the portion of the second frame 334 corresponding to the first groove 3321 protrudes in a direction away from the first frame 333, while the portion of the first frame 333 corresponding to the first groove 3321 does not protrude in a direction away from the second frame 334.

[0114] Optionally, when the portion of the first frame 333 corresponding to the first groove 3321 protrudes in the direction away from the second frame 334, the thickness of the portion of the first frame 333 corresponding to the first groove 3321 (i.e., the size of the portion in the Y direction) and the thickness of the portion of the first frame 333 corresponding to the second groove 3322 (i.e., the size of the portion in the Y direction) may be approximately the same. With this arrangement, the overall thickness of the first frame 333 is approximately the same, and the structural strength is better.

[0115] Similarly, when the portion of the second frame 334 corresponding to the first groove 3321 protrudes in a direction away from the first frame 333, the thickness of the portion of the second frame 334 corresponding to the first groove 3321 (i.e., the size of the portion in the Y direction) and the thickness of the portion of the second frame 334 corresponding to the second groove 3322 (i.e., the size of the portion in the Y direction) may be approximately the same.

[0116] By arranging the portion of the first frame 333 corresponding to the first groove 3321 to protrude in a direction away from the second frame 334, and / or the portion of the second frame 334 corresponding to the first groove 3321 to protrude in a direction away from the first frame 333, the structural strength of the frame 33 can be increased, and a larger first groove 3321 can be provided to accommodate a larger second portion 342, thereby improving the connection strength between the cover 34 and the frame 33.

[0117] For other embodiments, please refer to Figure 6 , the portion of the first frame 333 corresponding to the first groove 3321 does not protrude in the direction away from the second frame 334, and the portion of the second frame 334 corresponding to the first groove 3321 does not protrude in the direction away from the first frame 333. In other words, the first frame 333 and the second frame 334 are both substantially flat plates, and at least one of the two opposing surfaces of the first frame 333 and the second frame 334 is provided with a recess to form the first groove 3321.

[0118] In one embodiment, reference Figure 3, the first frame 333 protrudes toward the installation space 331 relative to the second frame 334 .

[0119] The first frame 333 protrudes toward the installation space 331 relative to the second frame 334, that is, in the X direction, the distance from one end of the first frame 333 away from the first installation frame 336 to the first installation frame 336 is greater than the distance from one end of the second frame 334 away from the first installation frame 336 to the first installation frame 336.

[0120] In this configuration, the contact area between the second frame 334 and the first part 341 of the covering member 34 is smaller than the contact area between the first frame 333 and the first part 341 of the covering member 34, which can make the covering member 34 more easily deformed toward the second frame 334. The tension of the deformation of the covering member 34 applies an inward pulling force to the battery cell 50 in the Y direction, thereby providing a pre-tightening force to the battery cell 50 to meet the working requirements of the battery device 100.

[0121] In one embodiment, the first frame 333 includes a plurality of connection segments, which are arranged in sequence along the circumferential direction, and each connection segment is connected to the second frame 334 .

[0122] Optionally, the multiple connecting segments may be connected or spaced apart; the distances between two adjacent connecting segments may be the same or different, without specific limitation. The connecting segments and the second frame 334 may be an integrated structure or a split structure, and each connecting segment may be connected to the second frame 334 by welding, screwing, clamping, etc., without limitation.

[0123] Optionally, the number of the connecting segments is 4, and the 4 connecting segments correspond to the 4 frames of the aforementioned frame 33, and there is a gap between two adjacent connecting segments, and the gap is located at the corner of the two adjacent frames. When the frame 33 and the covering member 34 are assembled, the receiving groove 332 can be formed by bending the connecting segments. When the connecting segments are bent, since there is a gap between two adjacent connecting segments, no interference will occur at the corner of the frame 33.

[0124] It should be understood that when the interval between adjacent connecting sections is not at the corners of the frame 33, or when the first frame 333 is an integrated structure connected end to end, since the material of the first frame 333 has good ductility, it can also be bent at the corners of the frame 33 to form a receiving groove 332.

[0125] By configuring the first frame 333 to include a plurality of connection segments sequentially arranged along the circumferential direction, the number of connection segments can be selected and the interval between two adjacent connection segments can be controlled according to actual needs, thereby saving costs.

[0126] In one embodiment, the frame 33 is an integrated structure. The frame 33 is an integrated structure made by an integrated molding process, and the frame 33 has high structural strength and is easy to install.

[0127] In one embodiment, please refer to Figure 1 and Figure 2 The inner wall surface of the connecting shell 10 is provided with a plurality of protrusions 14 arranged at intervals.

[0128] The shape and size of the protrusions 14 are not limited, and may be block-shaped, column-shaped, etc. The multiple protrusions 14 may be arranged at equal intervals, or the interval between two adjacent protrusions 14 is not limited. In one embodiment, the multiple protrusions 14 are arranged in an array.

[0129] The plurality of protrusions 14 may be provided on any one or a combination of the bottom plate 11, the first plate 12 and the second plate 13. For example, in one embodiment, Figure 1 As shown, the bottom plate 11, the first plate 12 and the second plate 13 are all provided with a plurality of protrusions 14. Alternatively, the first plate 12 and the second plate 13 are provided with a plurality of protrusions 14, and the bottom plate 11 is not provided with protrusions 14. Alternatively, the plurality of protrusions 14 are all provided on the bottom plate 11. All of the above methods are possible and are not specifically limited.

[0130] The protrusion 14 and the connection shell 10 may be an integral structure, or the protrusion 14 may be connected and fixed to the inner wall surface of the connection shell 10 by welding, screwing, riveting or other processes, without any specific limitation.

[0131] By providing the inner wall surface of the connecting shell 10 with a plurality of protrusions 14 arranged at intervals, the battery cell 50 in the storage space 40 can be positioned and limited to prevent the battery cell 50 from moving around in the X direction and the Z direction, thereby ensuring that the relative position of the battery cell 50 and the covering 34 is accurate, thereby allowing the covering 34 to elastically abut against the large surface of the battery cell 50.

[0132] The embodiment of the present application further provides an energy storage device, comprising the battery device 100 in the embodiment of the present application and a fixing plate, wherein the fixing plate is arranged on at least one side of the battery device 100 in the thickness direction.

[0133] Optionally, the energy storage device further includes a box having a receiving space, and the battery device 100 is received in the receiving space.

[0134] The box body is made of a material with high structural strength, specifically metal materials, high-strength plastics, ceramics, etc. Metal materials include aluminum, aluminum alloys, magnesium alloys, iron and iron alloys, etc. The box body can be an integrated structure, that is, the box body is an integrated structure made by an integrated molding process, and the integrated molding process can be stamping, casting, etc., without limitation. The box body can also be a split structure, and the various parts can be connected and fixed by welding, bonding, clamping, screwing, etc.

[0135] In one embodiment, the box of the energy storage device is roughly a rectangular parallelepiped. The box includes a bottom wall and four connecting plates, which are connected to the bottom wall and enclosed to form a receiving space. The four connecting plates include a first connecting plate and a second connecting plate that are opposite in the Y direction. The fixing plate is received in the receiving space and is arranged between the battery device 100 and the first connecting plate, and / or the fixing plate is arranged between the battery device 100 and the second connecting plate, without specific limitation.

[0136] The energy storage device in the embodiment of the present application, by setting a fixing plate on at least one side in the Y direction, can provide additional pre-tightening force to the battery cell 50 in the thickness direction (i.e., the Y direction) of the battery cell 50 in addition to the pre-tightening force provided by the covering member 34, thereby meeting the working requirements of the battery device 100.

[0137] In one embodiment, there are multiple battery devices 100, and the multiple battery devices 100 are arranged in sequence along the Y direction; a fixing plate is provided on the outermost side of the multiple battery devices 100 in the Y direction, and / or a fixing plate is provided between two adjacent battery devices 100.

[0138] Optionally, the fixing plate is disposed between the battery device 100 closest to the first connecting plate among the multiple battery devices 100 in the Y direction and the first connecting plate, and / or, the fixing plate is disposed between the battery device 100 closest to the second connecting plate among the multiple battery devices 100 in the Y direction and the second connecting plate. The fixing plate may also be disposed between any two adjacent battery devices 100, and a fixing plate may be disposed between two adjacent battery devices 100, or, in the multiple battery devices 100 disposed sequentially along the Y direction, a fixing plate may be disposed between every two battery devices 100, and the fixing plate may also be disposed in other ways, which are not specifically limited.

[0139] Illustratively, a fixing plate is provided between the battery device 100 closest to the first connecting plate among the multiple battery devices 100 and the first connecting plate, between the battery device 100 closest to the second connecting plate among the multiple battery devices 100 and the second connecting plate, and between two adjacent battery devices 100.

[0140] Optionally, the fixing plate may be connected and fixed to the box / battery device 100, or the fixing plate may be movable in the Y direction, without specific limitation.

[0141] At least one fixing plate is movable in the Y direction. Optionally, there is one fixing plate, which is arranged at the outermost side of the battery device in the Y direction, and the fixing plate can move in the Y direction to clamp the battery device to prevent the battery device from over-expanding; or, there are two fixing plates, which are respectively arranged on both sides of the outermost side of the battery device in the Y direction, one of which is connected and fixed to the box body, and the other fixing plate can move relative to the fixing plate; or, there are multiple fixing plates, and fixing plates are arranged between the battery device 100 closest to the second connecting plate and the second connecting plate among the multiple battery devices 100, and between two adjacent battery devices 100, one of which is arranged at the outermost side of the battery device in the Y direction is connected and fixed to the box body, and the remaining fixing plates can move relative to the fixing plate. The above method and any other feasible method are all possible, and there is no specific limitation.

[0142] In this configuration, by providing a movable fixing plate, the fixing plate can move toward or away from the battery device 100, which can further increase the squeezing force on the battery cell and prevent the battery cell from excessive expansion and degradation.

[0143] By setting a fixing plate at the outermost side of the multiple battery devices 100 in the overall thickness direction, and / or setting a fixing plate between two adjacent battery devices 100, in addition to the pre-tightening force provided by the covering member 34, the fixing plate can provide additional pre-tightening force to the battery cell 50 to meet the working requirements of the battery device 100.

[0144] The embodiment of the present application further provides a power system, including an electric device and the battery device 100 in the embodiment of the present application, or an energy storage device as in the embodiment of the present application, the battery device 100 or the energy storage device supplies power to the electric device.

[0145] The power system can be an electric vehicle, a hybrid vehicle, a base station, a household power load, etc., without specific limitation.

[0146] The power system in the embodiment of the present application adopts the battery device 100 or energy storage device in the embodiment of the present application. The battery device 100 or energy storage device can provide sufficient pre-tightening force to the battery cell 50 to meet the working requirements of the battery device 100 or the energy storage device.

[0147] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientation or positional relationship described in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0148] What is disclosed above is only a preferred embodiment of the present application, and it certainly cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiment and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A battery device (100), characterized in that: include: A connecting shell (10), comprising a bottom plate (11), a first plate (12) and a second plate (13), wherein the first plate (12) and the second plate (13) are connected to the bottom plate (11), and the first plate (12) and the second plate (13) are both located on the same side of the bottom plate (11), and the first plate (12) and the second plate (13) are arranged relatively spaced apart; A cover plate assembly (20), comprising a cover plate (21), wherein the cover plate (21) is connected to the first plate (12) and the second plate (13), and is opposite to the bottom plate (11); The first shell (31) and the second shell (32) are connected to the bottom plate (11), the first plate (12), the second plate (13) and the cover plate (21), and the first shell (31) and the second shell (32) are arranged relatively spaced apart, and the connecting shell (10), the first shell (31), the second shell (32) and the cover plate (21) are jointly enclosed to form a storage space (40); At least one of the first shell (31) and the second shell (32) comprises a frame (33) and a covering member (34); the covering member (34) is a thin film structure having elasticity; the frame (33) is in the form of a ring connected end to end, and the frame (33) is connected to the bottom plate (11), the first plate (12), the second plate (13) and the cover plate (21); the frame (33) encloses an installation space (331), and the covering member (34) is arranged in the installation space (331); the frame (33) has a receiving groove (332) connected in an annular direction, the opening direction of the receiving groove (332) faces the installation space (331), and the surrounding edges of the covering member (34) extend into the receiving groove (332) and are connected to the frame (33); The battery cell (50) is accommodated in the storage space (40); in a cross section along the height direction of the battery device (100), the battery cell (50) is a track-shaped wound battery cell or a rectangular stacked battery cell; the covering member (34) is in elastic contact with a large surface of the battery cell (50).

2. The battery device (100) according to claim 1, characterized in that: The accommodating groove (332) comprises a first groove (3321) and a second groove (3322), the first groove (3321) is located inside the frame (33), the second groove (3322) connects the installation space (331) and the first groove (3321), the direction from the first groove (3321) toward the second groove (3322) is a first direction, and in a second direction perpendicular to the first direction, a gap size of the first groove (3321) is greater than a gap size of the second groove (3322); The covering member (34) comprises a first portion (341) and a second portion (342), wherein the second portion (342) is connected to the four peripheral edges of the first portion (341), and in the second direction, the thickness dimension of the second portion (342) is greater than the thickness dimension of the first portion (341), and the thickness dimension of the second portion (342) is greater than the gap dimension of the second groove (3322), and the second portion (342) is accommodated in the first groove (3321), and at least a portion of the first portion (341) is accommodated in the second groove (3322).

3. The battery device (100) according to claim 2, characterized in that: The frame (33) comprises a first frame (333), a second frame (334) and a first connecting frame (335); the first frame (333) and the second frame (334) are arranged relative to each other in the second direction at an interval; the first frame (333) is closer to the storage space (40) than the second frame (334); the first connecting frame (335) connects one end of the first frame (333) and the second frame (334) respectively away from the installation space (331); the surface of the first frame (333) facing the second frame (334) and / or the surface of the second frame (334) facing the first frame (333) is recessed in an area close to the first connecting frame (335), so that the first frame (333), the second frame (334) and the first connecting frame (335) are jointly enclosed to form the first groove (3321); and the gap between the non-recessed areas of the respective opposite surfaces of the first frame (333) and the second frame (334) forms the second groove (3322).

4. The battery device (100) according to claim 3, characterized in that: The first connecting frame (335) includes a first outer surface (3351) facing away from the accommodating groove (332), and the frame (33) also includes a mounting frame (336), the mounting frame (336) protrudes from the first outer surface (3351) in the first direction, and the mounting frame (336) is connected and fixed to the connecting shell (10) and the cover plate (21).

5. The battery device (100) according to claim 4, characterized in that: The first outer surface (3351) is an arc surface, and the first outer surface (3351) is smoothly connected to the surface of the first frame (333) facing away from the second frame (334), and the surface of the mounting frame (336) facing the storage space (40) is connected and fixed to the connecting shell (10) and the cover plate (21).

6. The battery device (100) according to claim 5, characterized in that: The installation frame (336) is connected to the first connection frame (335).

7. The battery device (100) according to claim 5, characterized in that: The frame (33) further comprises a second connecting frame (337), wherein the second connecting frame (337) is connected to an end of the second frame (334) away from the first connecting frame (335), and the installation frame (336) is located on a side of the second frame (334) facing away from the first frame (333), and the installation frame (336) is connected to the second connecting frame (337).

8. The battery device (100) according to claim 7, characterized in that: The second connection frame (337) includes a second outer surface (3371) facing the installation space (331), the second outer surface (3371) is an arc surface, and the second outer surface (3371) is smoothly connected to the surface of the second frame (334) facing the first frame (333).

9. The battery device (100) according to claim 3, characterized in that: The portion of the first frame (333) corresponding to the first groove (3321) protrudes in a direction away from the second frame (334), and / or the portion of the second frame (334) corresponding to the first groove (3321) protrudes in a direction away from the first frame (333).

10. The battery device (100) according to claim 3, characterized in that: The first frame (333) protrudes toward the installation space (331) relative to the second frame (334).

11. The battery device (100) according to claim 3, characterized in that: The first frame (333) includes a plurality of connection segments, which are arranged in sequence along the circumferential direction, and each of the connection segments is connected to the second frame (334).

12. The battery device (100) according to any one of claims 1 to 11, characterized in that: The frame (33) is an integrated structure.

13. The battery device (100) according to any one of claims 1 to 11, characterized in that: The inner wall surface of the connecting shell (10) is provided with a plurality of protrusions (14) arranged at intervals.

14. An energy storage device, characterized in that: include: The battery device (100) according to any one of claims 1 to 13; A fixing plate is arranged on at least one side of the battery device (100) in the thickness direction.

15. The energy storage device according to claim 14, characterized in that: There are a plurality of battery devices (100), and the plurality of battery devices (100) are arranged in sequence along the thickness direction; the fixing plate is arranged at the outermost side of the plurality of battery devices (100) in the thickness direction of the battery devices (100), and / or the fixing plate is arranged between two adjacent battery devices (100); At least one of the fixing plates is movable in the thickness direction of the battery device (100).

16. A power system, characterized in that: include: Electrical equipment; The battery device (100) according to any one of claims 1 to 13, wherein the battery device (100) supplies power to the electrical device; or The energy storage device as claimed in claim 14 or 15, wherein the energy storage device supplies power to the electrical device.

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