Battery device, energy storage apparatus and power system

Abstract

A battery device (100), an energy storage apparatus and a power system. The battery device (100) comprises a connection housing (10), a cover plate assembly (20), a first housing (31), a second housing (32) and a battery cell (50), wherein the first housing (31) and the second housing (32) are oppositely arranged and spaced apart from each other; the connection housing (10), the first housing (31), the second housing (32) and the cover plate jointly enclose a storage space (40); at least one of the first housing (31) and the second housing (32) comprises a frame (33) and a covering member (34), wherein the frame (33) is in the shape of an endless ring, and the frame (33) is connected to a bottom plate (11), a first plate (12), a second plate (13) and the cover plate; the frame (33) encloses a mounting space (331), and the covering member (34) is arranged in the mounting space (331); the frame (33) is provided with a circumferentially continuous accommodating groove (332), the opening direction of the accommodating groove (332) faces the mounting space (331), and a peripheral edge of the covering member (34) extends into the accommodating groove (332) and is connected to the frame (33); and the battery cell (50) is accommodated in the accommodating space (40), and the covering member (34) elastically abuts against a large surface of the battery cell (50).

Description

Battery devices, energy storage devices and power systems

[0001] This application claims priority to Chinese Patent Application No. 202411433527.3, filed on October 14, 2024, entitled "Battery Device, Energy Storage Device and Power System", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of energy storage technology, specifically to a battery device, energy storage equipment, and power system. Background Technology

[0003] Battery devices typically consist of a casing and battery cells, with the cells housed within the casing. The thickness of the cells changes during battery assembly, formation, and subsequent use. Current battery devices, being of a fixed structure, cannot provide sufficient preload to the cells, thus failing to meet the operational requirements of the battery device. Summary of the Invention

[0004] The purpose of this application is to provide a battery device, energy storage device, and power system that solves the problem that the battery device cannot provide sufficient preload to the battery cell.

[0005] To achieve the objectives of this application, the following technical solution is provided:

[0006] In a first aspect, this 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 base plate, a first plate, and a second plate, the first plate and the second plate being connected to the base plate and located on the same side of the base plate, with the first plate and the second plate being spaced apart from each other. The cover plate assembly includes a cover plate, which is connected to the first plate and the second plate and is opposite to the base plate. The first shell and the second shell are all connected to the base plate, the first plate, the second plate, and the cover plate, with the first shell and the second shell being spaced apart from each other. The connecting shell, the first shell, the second shell, and the cover plate together form a single unit. The two housings are enclosed to form a storage space; at least one of the first housing and the second housing includes a frame and a cover, the frame is annular and connected end to end, and the frame is connected to the base plate, the first plate, the second plate and the cover plate; the frame encloses to form an installation space, and the cover is disposed in the installation space; the frame has a receiving groove that is connected in the circumferential direction, the opening of the receiving groove is facing the installation space, and the four edges of the cover extend into the receiving groove and are connected to the frame; the battery cell is housed in the storage space, and in the cross-section along the height direction of the battery device, the battery cell is a racetrack-shaped wound cell or a rectangular stacked cell, and the cover elastically abuts against the large surface of the battery cell.

[0007] The battery device of this application, by providing at least one of the first shell and the second shell including a frame and a cover, is a non-deformable structure compared to the side shell, which allows the cell to have a larger expansion space when the thickness changes. At the same time, the deformation of the cover can provide a tensile reaction on the large surface of the cell, thereby providing the cell with sufficient pre-tightening force to meet the working requirements of the battery device.

[0008] In a second aspect, this application also provides an energy storage device, including a battery device and a fixing plate as described in any of the various embodiments of the first aspect, wherein the fixing plate is disposed on at least one side of the battery device in the thickness direction.

[0009] The energy storage device of this application provides an additional preload force on the battery cell in the thickness direction by setting 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 component, thereby meeting the working requirements of the energy storage device.

[0010] Thirdly, this application also provides an electrical system including electrical equipment 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 electrical equipment.

[0011] The power system of this application, by employing the battery device or energy storage device in the embodiments of this application, can provide sufficient preload to the battery cell, thereby meeting the working requirements of the battery device or energy storage device. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0013] Figure 1 is a perspective view of a battery device according to an embodiment;

[0014] Figure 2 is an exploded schematic diagram of a battery device according to an embodiment;

[0015] Figure 3 is a partial cross-sectional schematic diagram of the frame and covering of one embodiment;

[0016] Figure 4 is a partial cross-sectional schematic diagram of the frame and cover of another embodiment;

[0017] Figure 5 is a partial cross-sectional schematic diagram of the frame and cover of another embodiment;

[0018] Figure 6 is a partial cross-sectional schematic diagram of the frame and cover in another embodiment.

[0019] Explanation of reference numerals in the attached drawings: 100-Battery assembly; 10-Connecting shell; 11-Base plate; 12-First plate; 13-Second plate; 14-Protrusion; 20-Cover assembly; 21-Cover plate; 22-Connecting piece; 23-Terminal post; 31-First housing; 32-Second housing; 33-Frame; 331-Mounting space; 332-Receiving slot; 3321-First slot; 3322-Second slot; 333-First frame; 334-Second frame; 335-First connecting frame; 3351-First outer surface; 336-Mounting frame; 337-Second connecting frame; 3371-Second outer surface; 34-Covering component; 341-First part; 342-Second part; 40-Storage space; 50-Battery cell;

[0020] X - Width direction of the battery device; Y - Thickness direction of the battery device; Z - Height direction of the battery device. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] 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 it can be in a middle component. When a component is said to be "connected" to another component, it can be directly connected to the other component or it may be in a middle component.

[0023] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terminology used in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0024] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0025] Please refer to Figures 1 and 2. This application provides a battery device 100, including a connecting shell 10, a cover assembly 20, a first shell 31, a second shell 32, and a battery cell 50. The assembled battery device 100 has a generally rectangular shape. For ease of explanation, the XYZ directions are defined: X is the width direction of the battery device 100, Y is the thickness direction of the battery device 100, and Z is the height direction of the battery device 100.

[0026] The connecting shell 10 includes a base plate 11, a first plate 12 and a second plate 13. The first plate 12 and the second plate 13 are connected to the base plate 11, and the first plate 12 and the second plate 13 are both located on the same side of the base plate 11. The first plate 12 and the second plate 13 are arranged at intervals relative to each other.

[0027] The base plate 11, the first plate 12, and the second plate 13 are all generally flat. The base plate 11 extends along the X direction, and the first plate 12 and the second plate 13 are respectively connected to the two sides of the base plate 11 in the X direction. The first plate 12 and the second plate 13 both extend along the Z direction. The connecting shell 10 can be a one-piece structure, that is, the base plate 11, the first plate 12, and the second plate 13 are a single piece. For example, it can be formed by bending a long plate, or it can be formed by other processes, without limitation. The connecting shell 10 can also be connected and fixed by welding, screwing, riveting, or other processes.

[0028] 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 base plate 11. The cover plate 21 can be made of aluminum, steel, etc., and a cover plate 21 made of aluminum is generally called a plain aluminum sheet. The cover plate 21 is also roughly flat and extends along the X direction. The two ends of the cover plate 21 in the X direction are connected to the first plate 12 and the second plate 13 respectively. The connection method can be welding, screwing, riveting, etc.

[0029] The cover plate assembly 20 also includes an insulating component (not shown), a terminal post 23, a connecting piece 22, and a top patch (not shown). The insulating component is disposed on the surface of the cover plate 21 facing the base plate 11. The cover plate 21 and the insulating component have holes through which the terminal post 23 passes, such that one end of the terminal post 23 is located at the insulating component, and the other end extends out of the cover plate 21. The connecting piece 22 connects the end of the terminal post 23 located at the insulating component to the tab of the battery cell 50. The top patch is affixed to the surface of the cover plate 21 facing away from the base plate 11, exposing the terminal post 23. The connecting piece 22 and the terminal post 23 are used to transmit electrical energy, the insulating component separates the connecting piece 22 and the cover plate 21 to prevent short circuits, and the top patch provides insulation protection. Positive and negative terminals can be simultaneously provided on a cover plate assembly 20. Specifically, the terminal 23 includes a positive terminal 23 and a negative terminal 23, and the connecting piece 22 includes a positive connecting piece 22 and a negative connecting piece 22. The positive terminal 23 and the negative terminal 23 are spaced apart on the same cover plate 21. The positive connecting piece 22 is connected to the positive terminal 23 and the positive tab, and the negative connecting piece 22 is connected to the negative terminal 23 and the negative tab. The specific structure of the cover plate assembly 20 can refer to any feasible solution, and the embodiments of this application are not limited.

[0030] The first shell 31 and the second shell 32 are all 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 at intervals relative to each other. The connecting shell 10, the first shell 31, the second shell 32 and the cover plate 21 together enclose and form a storage space 40.

[0031] The first shell 31 and the second shell 32 are generally plate-shaped. The first shell 31 and the second shell 32 are arranged at intervals relative to each other in the Y direction. The first shell 31 and the second shell 32 are respectively connected to the two sides of the connecting shell 10 and the cover plate 21 in the Y direction, so as to jointly enclose and form a storage space 40.

[0032] The battery cell 50 is housed in the storage space 40. The battery cell 50 is also generally rectangular in shape, with its width, thickness, and height directions corresponding to those of the aforementioned battery device 100. The battery cell 50 may include a bare cell 50, tabs, Mylar membrane, etc. The bare cell 50 has tabs connected to its end facing the cover assembly 20, and these tabs are connected to the aforementioned connecting piece 22. The tabs include a positive tab and a negative tab, both of which may be located at the same end for connection to the same cover assembly 20. The Mylar membrane covers the surface of the bare cell 50 except for the end facing the top cover. The Mylar membrane serves to protect the bare cell 50. The battery cell 50 may include one or more bare cells 50. When there are multiple bare cells 50, they are arranged side-by-side and connected to the same cover assembly 20. The specific structure of the battery cell 50 can be described with reference to any feasible solution; this application does not limit the specific implementation.

[0033] 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 racetrack-shaped; or, the battery cell 50 is a laminated battery cell 50, and in the cross-section along the Z direction, the cross-section of the battery cell 50 is rectangular. Either of the above methods is acceptable and there is no specific restriction.

[0034] In this embodiment, at least one of the first housing 31 and the second housing 32 includes a frame 33 and a covering 34. One of the first housing 31 and the second housing 32 may include both the frame 33 and the covering 34, while the other may be a flat plate. The flat side shell may be integrally formed with the connecting shell 10, or it may be connected and fixed to the connecting shell 10 by welding, screwing, riveting, or other methods. Alternatively, both the first housing 31 and the second housing 32 may include both the frame 33 and the covering 34, with essentially the same structure.

[0035] The frame 33 serves as the supporting foundation, and the covering 34 is mounted on the frame 33. The frame 33 can be made of metal, and its material can be the same as or different from that of the connecting shell 10 and the cover plate 21. Specific materials for the frame 33 include AL3003 (aluminum alloy with manganese as the main alloying element), SPCC (cold-rolled carbon steel sheet), and SUS304 (304 stainless steel). The covering 34 is made of an elastic material, providing elastic tension after deformation and possessing the ability to recover its original shape. Furthermore, the covering 34 is resistant to electrolyte corrosion. Specific materials for the covering 34 include EPDN (ethylene propylene diene monomer rubber), fluororubber, and PFA (tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer).

[0036] Please refer to FIGS. 2 and 3. The frame 33 is in a ring shape with the head and tail 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 an installation space 331, and the covering member 34 is disposed in the installation space 331. The frame 33 has a receiving groove 332 that is circumferentially connected. The opening direction of the receiving groove 332 faces the installation space 331. The four peripheral 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.

[0037] The frame 33 generally forms a "square" - shaped structure, which includes four side frames that extend in a generally linear manner. The four side frames are sequentially connected head - to - tail to form a ring, and two adjacent side frames are generally perpendicular. The four side frames are generally located in the same plane, and the area enclosed by the four side frames is the installation space 331. The four side frames are respectively connected to the bottom plate 11, the first plate 12, the second plate 13, and the cover plate 21. The connection method can be welding, screwing, riveting, etc., without limitation.

[0038] The shape of the covering member 34 when flattened is adapted to the shape of the space enclosed by the frame 33. That is, the covering member 34 is generally rectangular when flattened, and its thickness direction is the Y - direction. The four peripheral edges of the covering member 34 and the frame 33 can be snap - connected, or can be other feasible connection methods such as bonding, without limitation.

[0039] Combined with FIG. 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 the expansion in the X - direction and Z - direction is relatively small. When the battery cell 50 expands in the Y - direction, the four peripheral edges of the covering member 34 are connected and fixed to the frame 33. The battery cell 50 can expand into the installation space 331 enclosed by the frame 33, and further can expand to the side of the frame 33 opposite to the connection shell 10. The battery cell 50 presses the covering member 34, causing the part of the covering member 34 in contact with the large surface of the battery cell 50 to deform outward in the Y - direction. 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.

[0040] Please refer to Figures 1 and 2. Taking the structure of the first housing 31 and the second housing 32, both of which include a frame 33 and a covering 34, as an example, the assembly process of the battery device 100 is roughly as follows: the cover plate assembly 20 is connected to the cell 50. Specifically, the terminal post 23 is connected to the electrode tab through the connecting piece 22. When the cell 50 has two bare cells 50, the two bare cells 50 can be laid flat on the same plane and connected to the cover plate assembly 20 respectively. Then, the two bare cells 50 are combined. Specifically, the two bare cells 50 are combined into a whole arranged side by side along the Y direction and covered with a heat-fused Mylar film. After that, the cell 50 and the cover plate assembly 20 are installed into the connecting shell 10. The cover plate 21 of the cover plate assembly 20 is connected to the connecting shell 10. Then, the first housing 31 and the second housing 32 are installed. Finally, an outer film can be wrapped around the outside of the connecting shell 10, the first housing 31 and the second housing 32. A top patch is attached to the cover plate 21. The outer film plays a protective role.

[0041] In summary, the battery device 100 of this application embodiment, by providing at least one of the first housing 31 and the second housing 32 including a frame 33 and a covering 34, compared to the side shell being a non-deformable structure, allows the battery cell 50 to have a larger expansion space when the thickness changes. At the same time, the deformation of the covering 34 can provide a tensile reaction 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.

[0042] In one embodiment, referring to Figures 2 and 3, the receiving slot 332 includes a first slot 3321 and a second slot 3322. The first slot 3321 is located inside the frame 33, and the second slot 3322 connects the mounting space 331 and the first slot 3321. The direction of the first slot 3321 toward the second slot 3322 is a first direction, and in a second direction perpendicular to the first direction, the gap size of the first slot 3321 is larger than the gap size of the second slot 3322.

[0043] The covering member 34 includes a first portion 341 and a second portion 342, with the second portion 342 connected to the four peripheral edges of the first portion 341. In a 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.

[0044] 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 it can 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 can be the Z direction, or it can have a certain angle with the Z direction. The second direction can be the Y direction, or it 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 size of the first groove 3321 and the second groove 3322 refers to the size in the Y direction; when the covering 34 is in a flattened state, the plane on which the covering 34 is located is a plane formed by the X direction and the Z direction, and its thickness is the size in the Y direction.

[0045] The first slot 3321 has a larger gap size to accommodate the thicker second part 342. The second slot 3322 has a smaller gap size to accommodate the first part 341. The thickness of the second part 342 is greater than the gap size of the second slot 3322, so that the second part 342 cannot exit through the second slot 3322.

[0046] Optionally, the thickness of the first part 341 is 0.1mm-2mm, specifically 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, etc., without limitation. Optionally, the thickness of the second part 342 is 0.1mm-3mm thicker than the thickness of the first part 341. In a specific embodiment, the thickness of the first part 341 is 0.4mm, and the thickness of the second part 342 is 0.6mm.

[0047] The covering part 34 can be a one-piece structure, for example, the first part 341 and the second part 342 can be a one-piece structure formed by injection molding. The covering part 34 can also be a split structure that is connected to form a whole, for example, the first part 341 and the second part 342 can be connected by bonding, hot melt connection or other means to form a whole.

[0048] The receiving groove 332 is used to engage with the covering 34. That is, after the second part 342 is received in the first groove 3321, when the covering 34 deforms, it pulls the second part 342. The second part 342 will engage with the side wall of the second groove 3322 facing the opening of the first groove 3321 without exiting through the second groove 3322, thus realizing the engagement connection between the covering 34 and the frame 33.

[0049] By setting the receiving groove 332 including the first groove 3321 and the second groove 3322, and the covering part 34 including the first part 341 and the second part 342, the connection between the covering part 34 and the frame 33 can be realized with a simple structure. The structure is simple and easy to implement.

[0050] In one embodiment, referring to Figures 2 and 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 closer to the storage space 40 than the second frame 334. The first connecting frame 335 connects the ends of the first frame 333 and the second frame 334 that are away from the mounting 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 the 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.

[0051] The first frame 333, the second frame 334, and the first connecting frame 335 can all be in the form of a ring connected end to end along the circumference of the frame 33, or one or both of them can be a multi-segment structure arranged sequentially along the circumference, without limitation. In the cross-section at any position of the frame 33, the first frame 333, the second frame 334, and the first connecting frame 335 roughly form a "C" shape, and the three together enclose the receiving groove 332.

[0052] Alternatively, one of the first frame 333 and the second frame 334 may be recessed to form the first groove 3321, and correspondingly, the second part 342 of the covering member 34 protrudes from one side surface of the first part 341 in the second direction to correspond to the first groove 3321. Or both the first frame 333 and the second frame 334 may be recessed to form the first groove 3321, and correspondingly, the second part 342 protrudes from both sides surface of the first part 341 in the second direction to correspond to the first groove 3321.

[0053] The first connecting frame 335 is used to connect the first frame 333 and the second frame 334 to form a whole, and to close the side of the first groove 3321 facing away from the second groove 3322, so that the first groove 3321 can only communicate with the outside (the part outside the interior of the frame 33) through the second groove 3322, so that when the covering 34 is not deformed or retracted after deformation, the second part 342 is always in the first groove 3321 and will not move to other positions, thus ensuring the stability of the structure.

[0054] Optionally, the first frame 333, the first connecting frame 335, and the second frame 334 can be an integral structure. The assembly of the overall "C"-shaped structure with the covering 34 can be achieved by bending one of the first frame 333 and the second frame 334. Specifically, an intermediate component is first manufactured, which has an "L"-shaped cross-section at any position. The surface near the junction of the two segments of the "L"-shaped structure is pre-formed with a recess. Then, the second part 342 of the covering 34 is placed into one of the recesses. After that, one of the two segments of the "L"-shaped structure is bent to form a "C"-shaped structure. The pre-formed recesses face each other to form the first groove 3321.

[0055] Optionally, the first frame 333, the first connecting frame 335, and the second frame 334 can be two of them as a single unit, and formed into a whole with the third unit through welding, screwing, snap-fitting, etc., or the three units can be independent and formed into a whole through welding, screwing, snap-fitting, riveting, etc., without any restrictions. When assembling with the covering part 34, the second part 342 can be placed into the first groove 3321 first, and then the connection between the first frame 333, the first connecting frame 335, and the second frame 334 can be made.

[0056] By setting the frame 33 to include a first frame 333, a second frame 334 and a first connecting frame 335, the simple structure can realize the installation with the covering part 34 and provide a stable support foundation for the covering part 34. The structure is simple.

[0057] In one embodiment, referring to Figures 2 and 3, the first connecting frame 335 includes a first outer surface 3351 facing away from the receiving groove 332. The frame 33 also includes a mounting frame 336, which protrudes from the first outer surface 3351 in the X direction, and the mounting frame 336 is connected and fixed to the connecting shell 10 and the cover plate 21.

[0058] Optionally, the first frame 333, the first connecting frame 335, the second frame 334, and the mounting frame 336 can be an integral structure manufactured using a one-piece molding process. Alternatively, two of the first frame 333, the first connecting frame 335, the second frame 334, and the mounting frame 336 can be an integral structure, and the other two can be formed into a whole through welding, screwing, snap-fitting, etc. Alternatively, three of the first frame 333, the first connecting frame 335, the second frame 334, and the mounting frame 336 can be an integral structure, and the fourth can be formed into a whole through welding, screwing, snap-fitting, etc. Or, the four can be formed into a whole independently through welding, screwing, snap-fitting, etc., without any limitation.

[0059] Optionally, the mounting frame 336 is closer to the second frame 334 than the first frame 333, so that the outline of the first outer surface 3351 has a longer path in the cross-section of the frame 33, so that the first outer surface 3351 can abut against the connecting shell 10 and the cover plate 21, and play a limiting role.

[0060] Optionally, the connection method between the mounting frame 336 and the connecting shell 10 and the cover plate 21 can be welding, screwing, riveting, etc., without limitation. For example, the mounting frame 336 is welded and fixed to the connecting shell 10 and the cover plate 21. The mounting frame 336 protrudes from the first outer surface 3351, thereby providing a welding position, facilitating welding operations, and preventing the molten metal after welding from flowing into the receiving groove 332, thus avoiding the high temperature from affecting the covering part 34.

[0061] The frame 33 also includes a mounting frame 336, which protrudes from the first outer surface 3351 of the first connecting frame 335 and faces away from the receiving groove 332, facilitating the connection and assembly of the frame 33 with the connecting shell 10 and the cover plate 21.

[0062] In one embodiment, referring to 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 storage space 40 is connected and fixed to the connecting shell 10 and the cover plate 21.

[0063] The first outer surface 3351 is a convex surface. In the cross-section of the frame 33, the outline of the first outer surface 3351 is an arc. The first outer surface 3351 is tangent to the surface of the first frame 333 facing away from the second frame 334.

[0064] Optionally, the mounting frame 336 can 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 and the mounting frame 336 are not directly connected, but the mounting frame 336 protrudes from the first outer surface 3351.

[0065] Both the connecting shell 10 and the cover plate 21 are fixedly connected to the surface of the mounting frame 336 facing the storage space 40. That is, in the orthographic projection in the Y direction, the mounting frame 336 covers 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 an 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. After that, the mounting frame 336 is connected to the connecting shell 10 and the cover plate 21, for example, by welding.

[0066] 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 mounting 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.

[0067] In one embodiment, referring to Figures 2 and 3, the mounting frame 336 is connected to the first connecting frame 335. Thus, the frame 33 has a simple structure, good stability, and is easy to connect to the connecting shell 10 and the cover plate 21.

[0068] Optionally, the first frame 333, the first connecting frame 335, and the mounting frame 336 are an integral structure, and are formed as a whole with the second frame 334 through welding, screwing, snap-fitting, etc., and the connection position of the second frame 334 is located on the outside of the mounting space 331. When assembling with the cover 34, the second part 342 can be placed into the recess formed by the first frame 333 first, and then the second frame 334 can be connected. When assembling the battery device 100, after completing the assembly between the cell 50, the cover plate 21, and the connecting shell 10, 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, then the cover 34 is installed, and then the second frame 334 is installed. 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, so as to prevent the second frame 334 from affecting the cell 50 when it is connected (e.g., 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 cover 34.

[0069] In one embodiment, referring to Figures 2 and 3, the mounting frame 336, the first frame 333, the second frame 334, and the first connecting frame 335 are an integral 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 simplifies the structure. Furthermore, both flush surfaces are planar and located on the same plane.

[0070] 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 substantially a flat plate structure. In this embodiment, the frame 33 can be formed by bending the aforementioned intermediate member, the cross-sectional shape of which is substantially "T".

[0071] In one embodiment, referring to FIG4, the frame 33 is basically the same as the embodiment shown in FIG3, and also includes a first frame 333, a first connecting frame 335, a second frame 334 and a mounting frame 336. The difference is that the frame 33 also includes a second connecting frame 337, which is connected to the end of the second frame 334 away from the first connecting frame 335. The mounting frame 336 is located on the side of the second frame 334 facing away from the first frame 333, and the mounting frame 336 is connected to the second connecting frame 337.

[0072] Optionally, the second connecting frame 337, mounting frame 336, and second frame 334 can be an integral structure manufactured using a one-piece molding process. Alternatively, two of the second connecting frame 337, mounting frame 336, and second frame 334 can be an integral structure, and together with the third party, they can be formed as a whole through welding, screwing, snap-fitting, etc. Or, the three can be independent of each other and formed as a whole through welding, screwing, snap-fitting, etc., without any restrictions.

[0073] Optionally, the mounting frame 336 and the surface of the second frame 334 facing away from the first frame 333 may be in contact, or there may be a gap between the mounting frame 336 and the surface of the second frame 334 facing away from the first frame 333. Either of these methods is acceptable and there is no specific limitation.

[0074] Optionally, there is a gap between the surfaces of the mounting frame 336 and the second frame 334 facing away from the first frame 333. The size of this gap in the Y direction is 0mm-0.05mm, specifically 0.01mm, 0.015mm, 0.02mm, 0.025mm, 0.03mm, 0.035mm, 0.04mm, 0.045mm, 0.05mm, etc., and there is no specific limitation. In one specific embodiment, the size of this gap in the Y direction is 0.05mm.

[0075] Optionally, the second frame 334, the second connecting frame 337, and the mounting frame 336 may form a ring connected end-to-end along the circumference of the frame 33, or one or both of them may be a multi-segment structure arranged sequentially along the circumference, without limitation. In any cross-section of the frame 33, the second frame 334, the second connecting frame 337, and the mounting frame 336 generally form a "C" shape, and the opening direction of this "C" shape is opposite to that of the "C" shape generally formed by the first frame 333, the second frame 334, and the first connecting frame 335. In any cross-section of the frame 33, the first frame 333, the first connecting frame 335, the second frame 334, the second connecting frame 337, and the mounting frame 336 generally form an "S" shape.

[0076] The “S” shaped structure of the frame 33 described above can also be achieved by bending. During the bending process, the second part 342 of the covering 34 is first placed into the recess 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 34 can be installed.

[0077] By setting the second connecting frame 337 to the end of the second frame 334 away from the first connecting frame 335, and the mounting frame 336 located on the side of the second frame 334 facing away from the first frame 333, the frame 33 can be connected to the connecting shell 10 and the cover plate 21 while the cover 34 is installed on the frame 33.

[0078] In one embodiment, referring to FIG4, the second connecting frame 337 includes a second outer surface 3371 facing the mounting 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.

[0079] Optionally, the second outer surface 3371 is tangent to the surface of the second frame 334 facing the first frame 333. With this configuration, the second frame 334 will not interfere with the covering 34, facilitating the assembly of the covering 34 and the frame 33.

[0080] 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.

[0081] 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 cover 34 is squeezed by the expansion force of the battery cell 50, the first part 341 of the cover 34 will contact the second outer surface 3371, thus avoiding the first part 341 from directly contacting the sharp corner of the end of the second frame 334 away from the first connecting frame 335 and damaging the first part 341, which can improve the service life of the cover 34.

[0082] In one embodiment, referring to FIG5, the portion of the first frame 333 corresponding to the first groove 3321 protrudes away from the second frame 334, while the portion of the second frame 334 corresponding to the first groove 3321 does not protrude away from the first frame 333. In another embodiment, referring to FIG3, the portion of the first frame 333 corresponding to the first groove 3321 protrudes away from the second frame 334, and the portion of the second frame 334 corresponding to the first groove 3321 protrudes away from the first frame 333. In yet another embodiment, the portion of the second frame 334 corresponding to the first groove 3321 may protrude away from the first frame 333, while the portion of the first frame 333 corresponding to the first groove 3321 may not protrude away from the second frame 334.

[0083] Optionally, when the portion of the first frame 333 corresponding to the first groove 3321 protrudes in a 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 dimension of this portion in the Y direction) can be approximately the same as the thickness of the portion of the first frame 333 corresponding to the second groove 3322 (i.e., the dimension of this portion in the Y direction). With this setting, the overall thickness of the first frame 333 is approximately the same, resulting in better structural strength.

[0084] 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 dimension of that portion in the Y direction) can be approximately the same as the thickness of the portion of the second frame 334 corresponding to the second groove 3322 (i.e., the dimension of that portion in the Y direction).

[0085] By setting the portion of the first frame 333 corresponding to the first groove 3321 to protrude away from the second frame 334, and / or setting the portion of the second frame 334 corresponding to the first groove 3321 to protrude 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 part 342, thereby improving the connection strength between the covering 34 and the frame 33.

[0086] In other embodiments, referring to FIG6, 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, both the first frame 333 and the second frame 334 are generally flat, 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.

[0087] In one embodiment, referring to FIG3, the first frame 333 protrudes toward the mounting space 331 relative to the second frame 334.

[0088] The first frame 333 protrudes into the mounting 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 first mounting frame 336 to the first mounting frame 336 is greater than the distance from the end of the second frame 334 away from the first mounting frame 336 to the first mounting frame 336.

[0089] With this configuration, the contact area between the second frame 334 and the first part 341 of the covering 34 is smaller than the contact area between the first frame 333 and the first part 341 of the covering 34. This makes it easier for the covering 34 to deform toward the second frame 334. The tension of the deformation of the covering 34 is applied to the cell 50 in the Y direction, thereby providing the cell 50 with a pre-tightening force to meet the working requirements of the battery device 100.

[0090] In one embodiment, the first frame 333 includes a plurality of connecting segments arranged sequentially along the circumferential direction, and each connecting segment is connected to the second frame 334.

[0091] Optionally, multiple connecting segments can be connected or spaced apart; the distance between two adjacent connecting segments can be the same or different, without any specific restrictions. The connecting segments and the second frame 334 can be an integral structure or a separate structure, and each connecting segment is connected to the second frame 334 by welding, screwing, snap-fitting, or other methods, without any restrictions.

[0092] Optionally, there are four connecting segments, corresponding to the four side edges of the aforementioned frame 33, with a gap between adjacent connecting segments located at the corners of the adjacent side edges. When the frame 33 is assembled with the covering 34, a receiving groove 332 can be formed by bending the connecting segments. When the connecting segments are bent, there will be no interference at the corners of the frame 33 due to the gap between adjacent connecting segments.

[0093] It should be understood that, for cases where the interval between adjacent connecting segments is not at the corner of frame 33, or where the first frame 333 is an integral structure with the ends connected, the material of the first frame 333 has good ductility and can be bent at the corner of frame 33 to form a receiving groove 332.

[0094] By setting the first frame 333 to include multiple connecting segments arranged sequentially along the circumference, the number of connecting segments and the interval between two adjacent connecting segments can be selected according to actual needs, thus saving costs.

[0095] In one embodiment, the frame 33 is a one-piece structure. The frame 33 is a one-piece structure manufactured using a one-piece molding process, resulting in high structural strength and easy installation.

[0096] In one embodiment, referring to Figures 1 and 2, the inner wall surface of the connecting shell 10 is provided with a plurality of protrusions 14 spaced apart.

[0097] The shape and size of the protrusions 14 are not limited; they can be block-shaped, column-shaped, etc. Multiple protrusions 14 can be arranged at equal intervals, or the interval between two adjacent protrusions 14 is not limited. In one embodiment, multiple protrusions 14 are arranged in an array.

[0098] Multiple protrusions 14 can be provided on any one or a combination of multiple protrusions 14 on the base plate 11, the first plate 12, and the second plate 13. For example, in one embodiment, as shown in FIG1, multiple protrusions 14 are provided on the base 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, but no protrusions 14 are provided on the base plate 11. Alternatively, multiple protrusions 14 are all provided on the base plate 11. All of the above methods are acceptable and there is no specific limitation.

[0099] The protrusion 14 and the connecting shell 10 can be an integral structure, or the protrusion 14 can be connected and fixed to the inner wall surface of the connecting shell 10 by welding, screwing, riveting or other processes. There are no specific restrictions.

[0100] By providing multiple protrusions 14 spaced apart on the inner wall of the connecting shell 10, the battery cell 50 in the storage space 40 can be positioned and limited to prevent the battery cell 50 from moving randomly in the X and Z directions, ensuring the accurate relative position of the battery cell 50 and the covering 34, thereby allowing the large surface of the covering 34 to elastically abut against the battery cell 50.

[0101] This application embodiment also provides an energy storage device, including the battery device 100 and a fixing plate as described in this application embodiment, wherein the fixing plate is disposed on at least one side of the battery device 100 in the thickness direction.

[0102] Optionally, the energy storage device also includes a housing with a receiving space in which the battery unit 100 is housed.

[0103] The enclosure 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 enclosure can be a one-piece structure, meaning it is manufactured using a single molding process, such as stamping or casting, with no restrictions. Alternatively, the enclosure can be a modular structure, with each part connected and secured using welding, bonding, snap-fitting, screwing, or other methods.

[0104] In one embodiment, the energy storage device's enclosure is generally cuboid. The enclosure includes a bottom wall and four connecting plates, which are connected to the bottom wall and enclose a receiving space. The four connecting plates include a first connecting plate and a second connecting plate opposite each other in the Y direction. A fixing plate is received within the receiving space and disposed between the battery device 100 and the first connecting plate, and / or, the fixing plate is disposed between the battery device 100 and the second connecting plate; the specific placement is not limited.

[0105] The energy storage device in this application embodiment provides an additional pre-tightening force on the cell 50 in the thickness direction (i.e., the Y direction) of the cell 50 in addition to the pre-tightening force provided by the covering 34, by setting a fixing plate on at least one side in the Y direction, thereby meeting the working requirements of the battery device 100.

[0106] In one embodiment, there are multiple battery devices 100, which are arranged sequentially along the Y direction; a fixing plate is provided on the outermost side of the battery device 100 in the Y direction, and / or a fixing plate is provided between two adjacent battery devices 100.

[0107] Optionally, the fixing plate is disposed between the battery device 100 closest to the first connecting plate and the first connecting plate among the multiple battery devices 100 in the Y direction, and / or, the fixing plate is disposed between the battery device 100 closest to the second connecting plate and the second connecting plate among the multiple battery devices 100 in the Y direction. The fixing plate can also be disposed between any two adjacent battery devices 100. Fixing plates can be disposed between both adjacent battery devices 100, or, in the multiple battery devices 100 arranged sequentially along the Y direction, a fixing plate can be disposed every two battery devices 100. The fixing plate can also be disposed in other ways, and there are no specific limitations.

[0108] For example, a fixing plate is 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.

[0109] Optionally, the mounting plate can be connected and fixed to the housing / battery unit 100, or the mounting plate can be movable in the Y direction, without any specific limitation.

[0110] At least one fixing plate is movable in the Y direction. Optionally, there is one fixing plate, which is located on 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 the battery device from expanding excessively. Alternatively, there are two fixing plates, which are respectively located on the outermost sides of the battery device in the Y direction. One fixing plate is connected and fixed to the housing, and the other fixing plate can move relative to the fixing plate. Alternatively, there are multiple fixing plates. Fixing plates are provided 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 fixing plate located on the outermost side of the battery device in the Y direction is connected and fixed to the housing, and the remaining fixing plates can move relative to the fixing plate. The above methods and any other feasible methods are acceptable and are not limited in specific terms.

[0111] With this configuration, by setting up a movable fixing plate that can move toward or away from the battery device 100, the pressure on the battery cell can be further increased, preventing the battery cell from over-expanding and deteriorating.

[0112] By providing a fixing plate on the outermost side in the thickness direction of the multiple battery devices 100 as a whole, and / or by providing a fixing plate between two adjacent battery devices 100, the fixing plate can provide additional pre-tightening force to the cell 50 in addition to the pre-tightening force provided by the covering 34, thereby meeting the working requirements of the battery device 100.

[0113] This application also provides a power system, including electrical equipment and a battery device 100 as described in this application embodiment, or an energy storage device as described in this application embodiment, wherein the battery device 100 or the energy storage device supplies power to the electrical equipment.

[0114] The power system can be used for electric vehicles, hybrid electric vehicles, base stations, household electrical loads, etc., without specific restrictions.

[0115] The power system in this application embodiment employs the battery device 100 or energy storage device in this application embodiment. The battery device 100 or energy storage device can provide sufficient preload to the battery cell 50, which can meet the working requirements of the battery device 100 or energy storage device.

[0116] In the description of the embodiments of this application, it should be noted that the orientation or positional relationship of the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and other indicators are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0117] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art will understand that all or part of the processes for implementing the above embodiments and equivalent variations made in accordance with the claims of this application are still within the scope of this application.

Claims

1. A battery device (100), wherein, include: The connecting shell (10) includes a base plate (11), a first plate (12) and a second plate (13). The first plate (12) and the second plate (13) are connected to the base plate (11), and the first plate (12) and the second plate (13) are both located on the same side of the base plate (11). The first plate (12) and the second plate (13) are arranged at a distance from each other. The cover plate assembly (20) includes a cover plate (21) connected to the first plate (12) and the second plate (13) and 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 at intervals relative to each other. The connecting shell (10), the first shell (31), the second shell (32) and the cover plate (21) together enclose and form a storage space (40). At least one of the first housing (31) and the second housing (32) includes a frame (33) and a cover (34). The cover (34) is an elastic thin film structure. The frame (33) is annular with its ends connected. 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). The cover (34) is disposed in the installation space (331). The frame (33) has a receiving groove (332) that is connected in the circumferential direction. The opening direction of the receiving groove (332) is towards the installation space (331). The four edges of the cover (34) extend into the receiving groove (332) and are connected to the frame (33). The battery cell (50) is housed in the storage space (40). In the cross-section along the height direction of the battery device (100), the battery cell (50) is a racetrack-shaped wound cell or a rectangular stacked cell. The cover (34) elastically abuts against the large surface of the battery cell (50).

2. The battery device (100) according to claim 1, wherein, The receiving slot (332) includes a first slot (3321) and a second slot (3322). The first slot (3321) is located inside the frame (33). The second slot (3322) connects the mounting space (331) and the first slot (3321). The direction of the first slot (3321) toward the second slot (3322) is a first direction. In a second direction perpendicular to the first direction, the gap size of the first slot (3321) is larger than the gap size of the second slot (3322). The covering (34) includes a first part (341) and a second part (342). The second part (342) is connected to the four periphery of the first part (341). In the second direction, the thickness of the second part (342) is greater than the thickness of the first part (341), and the thickness of the second part (342) is greater than the gap size of the second groove (3322). The second part (342) is received in the first groove (3321), and at least a portion of the first part (341) is received in the second groove (3322).

3. The battery device (100) according to claim 2, wherein 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 second direction. The first frame (333) is closer to the storage space (40) than the second frame (334). The first connecting frame (335) connects the ends of the first frame (333) and the second frame (334) that are away from the mounting 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 the 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 the first groove (3321). The gap between the non-recessed areas of the opposing 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, wherein The first connecting frame (335) includes a first outer surface (3351) facing away from the receiving groove (332), and the frame (33) further includes a mounting frame (336), which 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, wherein 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). 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, wherein The mounting frame (336) is connected to the first connecting frame (335).

7. The battery device (100) according to claim 5, wherein The frame (33) further includes a second connecting frame (337), which is connected to the end of the second frame (334) away from the first connecting frame (335). The mounting frame (336) is located on the side of the second frame (334) facing away from the first frame (333), and the mounting frame (336) is connected to the second connecting frame (337).

8. The battery device (100) according to claim 7, wherein The second connecting frame (337) includes a second outer surface (3371) facing the mounting 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, wherein The portion of the first frame (333) corresponding to the first groove (3321) protrudes away from the second frame (334), and / or the portion of the second frame (334) corresponding to the first groove (3321) protrudes away from the first frame (333).

10. The battery device (100) according to claim 3, wherein The first frame (333) protrudes toward the mounting space (331) relative to the second frame (334).

11. The battery device (100) according to claim 3, wherein The first frame (333) includes multiple connecting segments, which are arranged sequentially along the circumference, and each connecting segment is connected to the second frame (334).

12. The battery device (100) according to any one of claims 1 to 11, wherein The frame (33) is an integral structure.

13. The battery device (100) according to any one of claims 1 to 11, wherein The inner wall surface of the connecting shell (10) is provided with a plurality of protrusions (14) spaced apart.

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

15. The energy storage device of claim 14, wherein, There are multiple battery devices (100), and the multiple battery devices (100) are arranged sequentially along the thickness direction; the fixing plate is provided on the outermost side of the multiple 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).

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

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