Battery devices, energy storage equipment and power systems

Abstract

A battery device, energy storage device, and power system, the battery device includes 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 to the bottom plate, the first plate, the second plate, and the cover plate of the connecting shell, and the first shell and the second shell are relatively spaced apart, and the connecting shell, the first shell, the second shell, and the cover plate together enclose a storage space; at least one of the first shell and the second shell includes a frame and a covering, the frame is annular and 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 to form 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 the covering is elastically abutted against the large surface of the battery cell. The battery device in this application provides sufficient preload force to 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, energy storage equipment and power system. Background Art

[0002] A battery assembly typically consists of a housing and a cell, with the cell housed within the housing. The thickness of the cell changes during assembly, formation, and subsequent use. Current battery assemblies are fixed structures that cannot provide sufficient preload to the cell, failing to meet the operational requirements of the battery assembly. Summary of the Invention

[0003] The purpose of this application is to provide a battery device, energy storage equipment and 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 the 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 includes 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, and the connecting shell, the first shell, the second shell and the cover plate are together The first shell and the second shell are enclosed 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 to form 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 in contact with the large surface of the battery cell.

[0006] The battery device of the present application, by providing at least one of the first shell and the second shell including a frame and a covering, can provide the battery cell with a larger expansion space when the thickness changes compared to the side shell which is 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 the first direction, and in the 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 part includes a first part and a second part, the second part is connected to the four 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 piece to include the first part and the second part, the connection between the covering piece and the frame can be achieved with a simple structure, which is simple and easy to achieve.

[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 up a structure in which the frame includes a first frame, a second frame and a first connecting frame, a simple structure can be used to achieve installation 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 further 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 further include a mounting frame, the mounting frame protrudes from the first outer surface of the first connecting frame facing away from the accommodating groove, thereby facilitating the connection and assembly of the frame with the connecting 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 the surface of the first frame facing away from the second frame, and the 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 embodiment, 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 easy to connect with the connecting shell and the cover plate.

[0017] In one embodiment, the frame further includes a second connecting frame 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 the 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 while the frame is connected to the connecting shell and the cover.

[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 away from the first connecting frame and damaging the first part, thereby improving the service life of the covering.

[0021] In one embodiment, 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 setting 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 embodiment, the first frame protrudes toward the installation space relative to the second frame.

[0024] With this arrangement, 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 makes it easier for the covering to deform toward the second frame. The tension of the deformed 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 embodiment, the first frame includes a plurality of connecting segments, which are sequentially arranged along a circumferential direction, and each of the connecting segments is connected to the second frame.

[0026] By configuring the first frame to include a plurality of connection segments sequentially arranged along the circumferential 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 a one-piece 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 the 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 pre-tightening force provided by the covering member, the fixing plate can provide additional pre-tightening force to the battery cell in the thickness direction, thereby meeting 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 provided on the outermost side of the battery devices in the thickness direction, and / or the fixing plate is provided 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 pre-tightening force provided by the covering, the fixing plate can provide additional pre-tightening force to the battery cell to meet the working requirements of the battery device.

[0035] In a third aspect, the present application also 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 following briefly introduces the drawings required for use in the implementation methods or the description of the prior art. 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 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 assembly, 21-cover, 22-connecting piece, 23-pole;

[0048] 31-first housing, 32-second housing, 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 portion, 342-second portion;

[0049] 40-Storage space;

[0050] 50-battery cells;

[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 this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0053] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be an intermediate component. When a component is referred to as being "connected to" another component, it may be directly connected to the other component or there may be an intermediate component.

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

[0055] The following describes some embodiments of the present application in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features therein may be combined with each other.

[0056] Please refer to Figure 1 and Figure 2 The present embodiment provides a battery device 100, comprising a connecting housing 10, a cover assembly 20, a first housing 31, a second housing 32, and a battery cell 50. The assembled battery device 100 has a generally rectangular shape. For ease of description, the X, Y, and Z directions are defined, where the X direction represents the width of the battery device 100, the Y direction represents the thickness of the battery device 100, and the Z direction represents the height 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. The first plate 12 and the second plate 13 are relatively spaced apart.

[0058] The base plate 11, first plate 12, and second plate 13 are all generally flat plates. The base plate 11 extends in the X-direction, and the first plate 12 and second plate 13 are connected to the two side edges of the base plate 11 in the X-direction. The first plate 12 and second plate 13 both extend in the Z-direction. The connecting shell 10 can be a one-piece structure, that is, the base plate 11, first plate 12, and second plate 13 are a one-piece structure. For example, the connecting shell 10 can be formed by bending a long plate, or other processes can be used without limitation. The connecting shell 10 can also be connected and fixed using 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 faces the base plate 11. The cover plate 21 can be made of aluminum, steel, or other materials. Aluminum cover plates 21 are generally referred to as plain aluminum sheets. The cover plate 21 is also generally flat and extends in the X-direction. Its two X-direction edges are connected to the first plate 12 and the second plate 13, respectively. Connections can be made by welding, screwing, riveting, or other methods.

[0060] The cover 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 21 facing the base plate 11. The cover 21 and the insulating member are provided with a hole, 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 21. The connecting piece 22 connects the end of the pole 23 located at the insulating member and the lug of the battery cell 50. The top patch is attached to the surface of the cover 21 facing away from the base 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 21 to avoid short circuit, and the top patch plays an insulating and protective role. Positive and negative terminals can be simultaneously provided on a single cover plate assembly 20. Specifically, the poles 23 include a positive pole 23 and a negative pole 23, and the connecting tabs 22 include a positive connecting tab 22 and a negative connecting tab 22. The positive pole 23 and the negative pole 23 are spaced apart and arranged on the same cover plate 21. The positive connecting tab 22 is connected to the positive pole 23 and the positive terminal tab, and the negative connecting tab 22 is connected to the negative pole 23 and the negative terminal tab. The specific structure of the cover plate assembly 20 can refer to any feasible solution and is not limited by the embodiments of this application.

[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. 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 arranged 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 tab, a Mylar film, etc. The bare battery cell 50 is connected to a tab at one end facing the cover assembly 20, and the tab is connected to the aforementioned connecting piece 22. The tab includes a positive tab and a negative tab, 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 battery cells 50. When there are multiple bare battery cells 50, the multiple bare battery cells 50 are arranged side by side and connected to the same cover assembly 20. Regarding the specific structure of the battery cell 50, reference can be made to any feasible solution, and the embodiments of the present application are 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 runway-shaped; 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 rectangular. All of the above methods are acceptable and are not specifically limited.

[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 can include the frame 33 and the covering 34, while the other can be simply a flat plate. The flat plate side shell can be integral with the connecting shell 10 or can be connected to the connecting shell 10 by welding, screwing, riveting, or other methods. The first shell 31 and the second shell 32 can also both include a frame 33 and a covering 34, and their structures are essentially the same.

[0066] The frame 33 serves as a supporting base, and the covering 34 is mounted on it. The frame 33 can be made of metal, either the same material as the connecting shell 10 or the cover plate 21, or a different material. Specific materials for the frame 33 include AL3003 (an aluminum alloy with manganese as the primary alloying element), SPCC (cold-rolled carbon steel sheet), SUS304 (304 stainless steel), etc. The covering 34 is made of an elastic material, capable of providing elastic tension after deformation and the ability to recover to its original state. Furthermore, the covering 34 is resistant to electrolyte corrosion. Specific materials for the covering 34 include EPDN (ethylene propylene diene monomer), fluororubber, PFA (tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer), etc.

[0067] Please refer to Figure 2 and Figure 3 The frame 33 is an annular structure connected end to end, and is connected to the base 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 cover 34 is disposed within the installation space 331. The frame 33 has an annular receiving groove 332 that opens toward the installation space 331. The edges of the cover 34 extend into the receiving groove 332 and are connected to the frame 33. The cover 34 elastically abuts against the large surface of the battery cell 50.

[0068] The frame 33 is roughly formed into a "mouth" shape, comprising four generally linear frames. The four frames are sequentially connected end to end to form a ring, with adjacent frames generally perpendicular to each other. The four frames are generally located in the same plane, and the area enclosed by the four frames constitutes the installation space 331. The four frames are connected to the base plate 11, first plate 12, second plate 13, and cover plate 21 in a one-to-one correspondence. The connection method can be welding, screwing, riveting, etc., without limitation.

[0069] The flattened shape of the covering member 34 matches the shape of the space enclosed by the frame 33. That is, the flattened covering member 34 is generally rectangular, with its thickness oriented in the Y direction. The edges of the covering member 34 and the frame 33 may be connected by snap-fitting or any other feasible connection method, such as bonding, without limitation.

[0070] Combine Figure 1 The large surface of the battery cell 50 is any 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 and Z directions. 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, causing the portion of the covering 34 that contacts the large surface of the battery cell 50 to deform 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 in which 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 piece 22. When the battery cell 50 has two bare battery cells 50, the two bare battery cells 50 can be first 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 in the Y direction and coated with hot-melt Mylar film; then the battery cell 50 and the cover plate assembly 20 are placed as a whole 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. The outer film plays a protective role.

[0072] In summary, the battery device 100 of the embodiment of the present application, by providing at least one of the first shell 31 and the second shell 32 including 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 which is 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 connects 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. In a second direction perpendicular to the first direction, the gap size of the first groove 3321 is larger than the gap size of the second groove 3322.

[0074] The covering member 34 includes a first portion 341 and a second portion 342. The second portion 342 is connected to the four edges of the first portion 341. In the second direction, the thickness of the second portion 342 is greater than that of the first portion 341, and the thickness of the second portion 342 is greater than the gap dimension 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 can be the X direction or can have a certain angle with the X direction; at the connection between the frame 33 and the base plate 11 and the cover plate 21, the first direction can be the Z direction or can have a certain angle with the Z direction. The second direction can be the Y direction or can have a certain angle with the Y direction. For example, taking the first direction as the X direction or the Z direction and the second direction as the Y direction, the gap dimension between the first groove 3321 and the second groove 3322 refers to the dimension in the Y direction; when the cover 34 is in a flattened state, the plane on which the cover 34 is located is the plane formed by the X direction and the Z direction, and its thickness is the dimension in the Y direction.

[0076] The first groove 3321 has a larger gap to accommodate the thicker second portion 342. The second groove 3322 has a smaller gap to accommodate the first portion 341. The thickness of the second portion 342 is greater than the gap in 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 to 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 to 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 to be snap-fitted and connected with the covering part 34, that is, after the second part 342 is accommodated in the first groove 3321, the covering part 34 pulls the second part 342 when it is deformed, and the second part 342 will be snap-fitted 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 part 34 and the frame 33.

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

[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 spaced apart from each other in the Y direction, with the first frame 333 being 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, each of which is 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 near the first connecting frame 335, so that the first frame 333, the second frame 334, and the first connecting frame 335 together enclose a first groove 3321, and the gap between the non-recessed areas of the opposing surfaces of the first frame 333 and the second frame 334 forms a second groove 3322.

[0082] The first frame 333, the second frame 334, and the first connecting frame 335 can all be annular, connected end to end along the circumferential direction of the frame 33. Alternatively, one or both of them can be a multi-stage structure arranged sequentially along the circumferential 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 together they enclose the receiving slot 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 sides 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 will not move to other positions, thereby ensuring the stability of the structure.

[0085] Alternatively, the first frame 333, the first connecting frame 335, and the second frame 334 may be an integral structure, and the overall "C"-shaped structure may be assembled with the cover 34 by bending one of the first frame 333 and the second frame 334. Specifically, an intermediate member is first fabricated, wherein the cross-section of the intermediate member is "L"-shaped at any position, and a depression is pre-formed on the surface near the junction of the two sections of the "L"-shaped structure. The second portion 342 of the cover 34 is then placed into one of the depressions, and one of the two sections of the "L"-shaped structure is then bent to form a "C"-shaped structure, with the pre-formed depressions facing each other and forming the first groove 3321.

[0086] Alternatively, the first frame 333, the first connecting frame 335, and the second frame 334 may be integrally formed with the third frame by welding, screwing, or snapping, or they may be independent and integrated by welding, screwing, snapping, or riveting, without limitation. When assembling the cover 34, the second portion 342 may be placed into the first groove 3321 before connecting the first frame 333, the first connecting frame 335, and the second frame 334.

[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 used to achieve installation with the covering member 34 and provide a stable supporting foundation for the covering member 34, with a simple structure.

[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 mounting frame 336 can be an integral structure made by an integral molding process. Alternatively, the first frame 333, the first connecting frame 335, the second frame 334, and the mounting frame 336 can be an integral structure of two of them, and are connected to the other two by welding, screwing, clamping, etc. to form a whole. Alternatively, the first frame 333, the first connecting frame 335, the second frame 334, and the mounting frame 336 can be an integral structure of three of them, and are connected to the fourth by welding, screwing, clamping, etc. to form a whole. Alternatively, the four can be independent and connected to each other by welding, screwing, clamping, etc. to form a whole, all of which are not limited.

[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 mounting frame 336 can be connected to the connection shell 10 and the cover plate 21 by welding, screwing, riveting, or the like, without limitation. Exemplarily, the mounting frame 336 is welded to the connection shell 10 and the cover plate 21. The mounting frame 336 protrudes from the first outer surface 3351, thereby providing a welding position that facilitates the welding operation. Furthermore, after welding, molten metal will not flow into the receiving groove 332, thereby preventing the high temperature from affecting the cover 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 , thereby facilitating 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, and the first outer surface 3351 is smoothly connected to the surface of the first frame 333 facing away from the second frame 334 . The surface of the mounting frame 336 facing the receiving 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] Alternatively, 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 receiving 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 the mounting frame 336 protrudes from the first outer surface 3351.

[0096] The connecting 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 obscures at least a portion of the connecting shell 10 and the cover plate 21. During installation, the frame 33 is moved relative to the connecting shell 10 and the cover plate 21. The connecting shell 10 and the cover plate 21 can first contact the first outer surface 3351. Since the first outer surface 3351 is a circular arc surface, the connecting shell 10 and the cover plate 21 will slide along the first outer surface 3351 and contact the surface of the mounting frame 336 facing the storage space 40, completing accurate positioning. The mounting frame 336 is then connected to the connecting shell 10 and the cover plate 21, for example, by welding.

[0097] By setting the first outer surface 3351 as an arc surface, when the connecting 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 connecting 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 connecting frame 335, and the mounting frame 336 are integrally formed and joined to the second frame 334 by welding, screwing, snapping, or the like, with the second frame 334 connected outside the mounting space 331. When assembled with the cover 34, the second portion 342 can be placed into the recess formed by the first frame 333 before the second frame 334 is connected. When assembling the battery device 100, after the battery cells 50, the cover plate 21, and the connecting shell 10 are assembled, the integral structure of the first frame 333, the first connecting frame 335, and the mounting frame 336 is first connected to the connecting shell 10 and the cover plate 21. The cover 34 is then installed, followed by the second frame 334. The first frame 333, the first connecting frame 335 and the mounting 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 connected (for example, high-temperature molten metal during welding). The second frame 334 cooperates with the first frame 333, the first connecting frame 335 and the mounting 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. 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 simplify the structure. Furthermore, the two flush surfaces are both flat and located on the same plane.

[0101] Furthermore, the surface of the mounting frame 336 facing the storage space 40 is flush with the non-recessed area of ​​the surface of the second frame 334 facing the first frame 333. Furthermore, both flush surfaces are planar and lie on the same plane. In other words, the second frame 334 and the mounting frame 336 are generally flat. The frame 33 in this embodiment can be formed by bending the aforementioned intermediate member, which has a generally T-shaped cross-section.

[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 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 installation frame 336 is connected to the second connecting frame 337.

[0103] Optionally, the second connecting frame 337, the mounting frame 336, and the second frame 334 can be an integral structure manufactured by an integral molding process. Alternatively, two of the second connecting frame 337, the mounting frame 336, and the second frame 334 can be an integral structure and joined to the third by welding, screwing, or clamping, or the like. Alternatively, the three can be independent and joined to the third by welding, screwing, or clamping, etc., without limitation.

[0104] Optionally, the installation frame 336 contacts 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 . Both of the above methods are possible and are not specifically limited.

[0105] Optionally, a gap is provided between the mounting frame 336 and the surface of the second frame 334 facing away from the first frame 333. The size of the gap in the Y direction is 0 mm to 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 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 annular, connected end to end along the circumferential direction of the frame 33, or one or both of them may be a multi-segment structure arranged sequentially along the circumferential 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 generally form a "C"-shaped structure, and the opening direction of the "C"-shaped structure is opposite to that of the "C"-shaped structure generally formed by the first frame 333, the second frame 334, the first connecting frame 335, the second frame 334, the second connecting frame 337, and the installation frame 336. 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 to achieve the installation of the covering member 34.

[0108] By setting a second connecting frame 337 to be 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 also be installed with the covering part 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. 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 directly contacting the sharp corner of the end of the second frame 334 away from the first connecting frame 335 and damaging 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 setting 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 the end of the first frame 333 away from the installation frame 336 to the installation frame 336 is greater than the distance from the end of the second frame 334 away from the installation frame 336 to the installation frame 336 .

[0120] In this arrangement, 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 makes it easier for the covering member 34 to deform toward the side of 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 connecting segments, which are sequentially arranged along the circumferential direction, and each connecting segment is connected to the second frame 334 .

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

[0123] Optionally, there are four connecting segments, corresponding to the four sides of the frame 33. A gap exists between two adjacent connecting segments, with the gap located at the corner of the two adjacent sides. When the frame 33 and the cover 34 are assembled, the connecting segments can be bent to form the receiving groove 332. When the connecting segments are bent, the gap between the adjacent connecting segments prevents interference at the corners 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 can be block-shaped, column-shaped, etc. The multiple protrusions 14 can 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, multiple protrusions 14 are provided on the bottom plate 11, the first plate 12, and the second plate 13. Alternatively, multiple protrusions 14 are provided on the first plate 12 and the second plate 13, while no protrusions 14 are provided on the bottom plate 11. Alternatively, multiple protrusions 14 are 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 can be an integral structure, or the protrusion 14 can be connected and fixed to the inner wall surface of the connection shell 10 by welding, screwing, riveting or other processes, which are not specifically limited.

[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, preventing the battery cell 50 from moving around in the X and Z directions, ensuring the relative position of the battery cell 50 and the covering 34 is accurate, and thus making the covering 34 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 housing is made of a material with high structural strength, specifically metal, high-strength plastic, ceramic, etc. Metal materials include aluminum, aluminum alloys, magnesium alloys, iron, and iron alloys. The housing can be a one-piece structure, i.e., a one-piece structure manufactured using a one-piece molding process, such as stamping or casting, without limitation. The housing can also be a split-piece structure, with the various components connected and secured by welding, bonding, clamping, screwing, etc.

[0135] In one embodiment, the housing of the energy storage device is generally rectangular. The housing includes a bottom wall and four connecting plates connected to the bottom wall to enclose a receiving space. The four connecting plates include a first connecting plate and a second connecting plate that are opposite to each other in the Y direction. A fixing plate is housed in the receiving space and is disposed between the battery device 100 and the first connecting plate, and / or between the battery device 100 and the second connecting plate, without limitation.

[0136] The energy storage device in the embodiment of the present application provides a fixing plate on at least one side in the Y direction. 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 in the thickness direction (i.e., the Y direction) of the battery cell 50 , 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, or between two adjacent battery devices 100. Alternatively, a fixing plate may be disposed between every two battery devices 100 in the multiple battery devices 100 disposed sequentially along the Y direction. The fixing plates may also be disposed in other manners, which are not specifically limited.

[0139] Illustratively, fixing plates are provided between the battery device 100 closest to the first connecting plate and the first connecting plate, between the battery device 100 closest to the second connecting plate 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 disposed at the outermost side of the battery device in the Y direction. The fixing plate can move in the Y direction to clamp the battery device and prevent excessive expansion of the battery device. Alternatively, there are two fixing plates, which are disposed 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, and the other fixing plate can move relative to the fixing plate. Alternatively, there are multiple fixing plates, and fixing plates are disposed between the battery device 100 closest to the second connecting plate and the second connecting plate, as well as between two adjacent battery devices 100. One of the fixing plates disposed at the outermost side of the battery device in the Y direction is connected and fixed to the box, and the remaining fixing plates can move relative to the fixing plate. The above methods and any other feasible methods are applicable and are not specifically limited.

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

[0143] By setting a fixing plate at the outermost side of the thickness direction of the multiple battery devices 100 as a whole, 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] An embodiment of the present application further provides a power system, including an electrical 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, wherein the battery device 100 or the energy storage device supplies power to the electrical 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 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. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present application.

[0148] The above disclosure is only a preferred embodiment of the present application, and 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 the above embodiment and equivalent changes made in accordance with 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) comprises 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 relative to each other with a spacing therebetween; A cover plate assembly (20) includes 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 enclosed together 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), wherein the covering member (34) is a thin film structure having elasticity, and 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 and forms 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 edges of the covering member (34) extend into the receiving groove (332) and are connected to the frame (33); A 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 runway-shaped wound battery cell or a rectangular laminated battery cell; the covering member (34) elastically abuts against a large surface of the battery cell (50); 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) communicates with 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) 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), 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).

2. The battery device (100) according to claim 1, characterized in that 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 relative to each other in the second direction, 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).

3. The battery device (100) according to claim 2, 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) further includes a mounting frame (336), wherein 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).

4. The battery device (100) according to claim 3, 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).

5. The battery device (100) according to claim 4, characterized in that The installation frame (336) is connected to the first connection frame (335).

6. The battery device (100) according to claim 4, characterized in that The frame (33) further includes a second connecting frame (337), the second connecting frame (337) being connected to an end of the second frame (334) away from the first connecting frame (335), the installation frame (336) being located on a side of the second frame (334) facing away from the first frame (333), and the installation frame (336) being connected to the second connecting frame (337).

7. The battery device (100) according to claim 6, 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).

8. The battery device (100) according to claim 2, 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).

9. The battery device (100) according to claim 2, characterized in that The first frame (333) protrudes toward the installation space (331) relative to the second frame (334).

10. The battery device (100) according to claim 2, characterized in that The first frame (333) includes a plurality of connecting segments, which are arranged in sequence along the circumferential direction, and each of the connecting segments is connected to the second frame (334).

11. The battery device (100) according to any one of claims 1 to 10, characterized in that: The frame (33) is an integrated structure.

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

13. An energy storage device, characterized in that: include: The battery device (100) according to any one of claims 1 to 12; A fixing plate is provided on at least one side of the battery device (100) in the thickness direction.

14. The energy storage device according to claim 13, characterized in that There are a plurality of battery devices (100), and the plurality of battery devices (100) are sequentially arranged along the thickness direction; the fixing plate is provided on the outermost sides of the plurality of battery devices (100) in the thickness direction, and / or the fixing plate is provided between two adjacent battery devices (100); At least one of the fixing plates is movable in the thickness direction of the battery device (100).

15. A power system, characterized in that: include: Electrical equipment; The battery device (100) according to any one of claims 1 to 12, wherein the battery device (100) supplies power to the electrical device; or The energy storage device according to claim 13 or 14, wherein the energy storage device supplies power to the electrical device.

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