Energy storage device and electric equipment

Abstract

The utility model provides an energy storage device and electric equipment, which are used for preventing a battery cell from shaking in a shell, ensuring the assembly stability of the battery cell in the shell and prolonging the service life of the energy storage device. The energy storage device comprises a shell, a battery cell assembly and an elastic plate, the shell is provided with a containing cavity, the containing cavity is located on the inner side of the shell, the battery cell assembly and the elastic plate are both located in the containing cavity, and the peripheral side face of the battery cell assembly and the cavity wall face of the containing cavity are oppositely arranged in a spaced mode and comprise the first side face and the second side face. The area of the first side face is larger than that of the second side face, the elastic plate is located between the first side face and the cavity wall face of the containing cavity and comprises a push plate and an elastic piece, the push plate abuts against the first side face, the elastic piece is located on the side, away from the battery cell assembly, of the push plate, and the elastic piece comprises an assembling part, an abutting-pushing part and a connecting part; the pushing part and the assembling part are arranged in a staggered mode and push the cavity wall face of the containing cavity, and the connecting part is fixedly connected between the assembling part and the pushing part.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to an energy storage device and electrical equipment. Background Art

[0002] With the continuous development of energy storage technology, secondary batteries, due to their recyclable properties, have gradually become the primary power source for electrical devices. During the charge and discharge cycle of a secondary battery, the battery cells within the casing expand, necessitating a certain amount of space between the cells and the casing to accommodate this expansion. However, when the secondary battery is not in use, the cells are prone to oscillation within the casing, potentially colliding with the casing and causing damage, thus shortening the battery's service life. Utility Model Content

[0003] The present application provides an energy storage device and an electrical device, which are used to prevent the battery cell from shaking in the shell, ensure the assembly stability of the battery cell in the shell, and improve the service life of the energy storage device.

[0004] The present application discloses an energy storage device, comprising a shell, a battery cell assembly and an elastic plate, wherein the shell is provided with a receiving cavity, the receiving cavity is located on the inner side of the shell, the battery cell assembly and the elastic plate are both located in the receiving cavity, the peripheral side surface of the battery cell assembly is spaced apart from and arranged relative to the cavity wall surface of the receiving cavity, the peripheral side surface of the battery cell assembly includes two first side surfaces and two second side surfaces, along the width direction of the battery cell assembly, the two first side surfaces are arranged back to back, along the length direction of the battery cell assembly, the two second side surfaces are arranged back to back, and the two second side surfaces are connected between the two first side surfaces, and the area of ​​the first side surface is larger than that of the battery cell assembly. The area of ​​the second side surface, the elastic plate is located between the peripheral side surface of the battery cell assembly and the cavity wall surface of the accommodating cavity, the elastic plate includes a push plate and a spring plate, the push plate pushes the first side peripheral side surface of the battery cell assembly, the spring plate is located on the side of the push plate away from the battery cell assembly, the spring plate includes an assembly part, a pushing part and a connecting part, the assembly part is fixedly connected to the push plate, along the height direction of the battery cell assembly, the pushing part and the assembly part are staggered, the pushing part and the assembly part are spaced apart, and push the cavity wall surface of the accommodating cavity, and the connecting part is fixedly connected between the assembly part and the pushing part

[0005] In the present application, an elastic plate is arranged between the shell and the battery cell assembly. The push plate of the elastic plate abuts the battery cell assembly, and the spring sheet of the elastic plate abuts the shell, which can fix the position of the battery cell assembly in the shell, limit the movement of the battery cell assembly in the receiving cavity, and provide a pre-tightening force between the battery cell assembly and the shell and the expansion space required for the battery cell assembly. When the elastic plate is compressed to the limit, the thickness of the deformed spring sheet is the thickness of a piece of spring sheet, which can provide expansion space for the battery cell assembly to the greatest extent, improve the energy density of the energy storage device, and improve the safety performance and service life of the energy storage device.

[0006] There are at least two elastic plates, which are located on opposite sides of the battery cell assembly, respectively, so that the battery cell assembly can be subjected to more uniform force, better fix the battery cell assembly, provide expansion space, and provide more uniform pre-tightening force for the battery cell.

[0007] The push plate includes a first surface and a second surface, the first surface is the surface of the push plate facing the battery cell assembly and pushing the first side surface of the battery cell assembly, and the second surface is arranged opposite to the first surface;

[0008] The push plate is provided with an avoidance groove, the opening of the avoidance groove is located on the second surface and is arranged opposite to the push portion. The push portion can extend into the avoidance groove, which can not only avoid interference between the spring sheet and the push plate, but also reduce the thickness of the compressed elastic plate and increase the expansion space of the battery cell assembly.

[0009] In which, the pushing portion includes a pushing surface facing away from the push plate, and the pushing surface is an arc surface. The pushing surface protrudes in the direction away from the push plate and pushes against the wall of the receiving cavity to prevent the shrapnel from scratching the shell to produce metal wires and metal chips, thereby ensuring the reliability of the energy storage device.

[0010] In which, the pushing surface includes a guide portion close to the assembly portion, and the distance between the guide portion and the push plate gradually increases along the direction from the assembly portion toward the pushing portion. The guide portion of the pushing surface can guide the push plate and the battery cell assembly into the receiving cavity to compress the spring sheet of the elastic plate, and the elastic angle will be reduced to provide pre-tightening force for the battery cell assembly.

[0011] Among them, the connecting portion and the push plate form an elastic angle, which is an acute angle. The elastic angle deforms as the battery cell assembly deforms, providing pre-tightening force and expansion space for the battery cell assembly, fixing the position of the battery cell assembly in the shell, and limiting the movement of the battery cell assembly in the shell.

[0012] Among them, there are multiple spring clips, and along the height direction of the shell, the multiple spring clips are arranged in sequence at intervals. The multiple spring clips can make the force on the elastic plate more dispersed and uniform, better fix the battery cell assembly and provide expansion space and pre-tightening force for the battery cell assembly.

[0013] Wherein, the material of the spring piece is spring steel or stainless steel metal material, which can improve the elastic performance of the elastic plate, thereby increasing the service life of the elastic plate.

[0014] The pushing portion, the assembling portion and the connecting portion are integrally formed, so that the structure of the spring sheet is more complete, the spring sheet has higher rigidity, and the safety and durability of the spring sheet are improved.

[0015] The present application also provides an electrical device, comprising an energy storage device as described above, wherein the energy storage device is used to supply power to the electrical device, thereby improving the safety performance and service life of the electrical device.

[0016] The energy storage device and electrical equipment provided in the present application are configured with an elastic plate between the outer shell and the battery cell assembly. The push plate of the elastic plate pushes the battery cell assembly, and the spring sheet of the elastic plate pushes the outer shell. The elastic plate can limit the movement of the battery cell assembly in the receiving cavity and play a role of fixed support. At the same time, the elastic plate can provide the expansion space and pre-tightening force required for the battery cell assembly, thereby improving the safety performance and service life of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be described below.

[0018] Figure 1 A schematic diagram of the structure of the energy storage device provided in an embodiment of the present application;

[0019] Figure 2 yes Figure 1 A schematic diagram of the exploded structure of the energy storage device shown;

[0020] Figure 3 yes Figure 2 A schematic structural diagram of the housing in the energy storage device shown;

[0021] Figure 4 yes Figure 2 A schematic diagram of the structure of the battery cell assembly in the energy storage device shown;

[0022] Figure 5 yes Figure 4 Schematic diagram of the exploded structure of the battery cell assembly shown;

[0023] Figure 6 yes Figure 2 A schematic structural diagram of the elastic plate in the energy storage device shown;

[0024] Figure 7 yes Figure 6 Schematic diagram of the exploded structure of the elastic plate shown;

[0025] Figure 8 yes Figure 6 The structural diagram of the elastic plate shown is at another angle;

[0026] Figure 9 yes Figure 1 The schematic cross-sectional structure diagram of the energy storage device shown is taken along the AA section plane;

[0027] Figure 10 yes Figure 9 Schematic diagram of the structure of the elastic plate in the energy storage device during the compression process.

[0028] Figure 1: Energy storage device 1000, housing 100, accommodating cavity 101, opening 102, first cavity wall 103, second cavity wall 104, battery cell assembly 200, battery cell 210, insulating layer 220, elastic plate 300, top cover 400, push plate 10, spring piece 20, pushing portion 21, assembly portion 22, connecting portion 23, first surface 11, second surface 12, third side surface 13, avoidance groove 14, first side surface 201, second side surface 202, pushing surface 211, guide portion 2111, assembly surface 221, elastic angle α. DETAILED DESCRIPTION

[0029] 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 in 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.

[0030] See also Figures 1 to 2 , Figure 1 is a schematic structural diagram of an energy storage device 1000 provided in an embodiment of the present application. Figure 2 yes Figure 1 Schematic diagram of the exploded structure of the energy storage device 1000 is shown.

[0031] This application provides an energy storage device 1000. Energy storage device 1000 may include, but is not limited to, single cells, battery modules, battery packs, and battery systems. The energy storage device provided in the embodiments of this application may be, but is not limited to, the products listed above, or may be implemented in other forms. This embodiment of this application does not impose strict limitations on the application form of energy storage device 1000. This embodiment of this application uses a prismatic battery as an example for illustration.

[0032] The energy storage device 1000 includes a shell 100, a battery cell assembly 200, an elastic plate 300, and a top cover 400. The shell 100 is provided with a receiving cavity 101 and an opening 102. The receiving cavity 101 is located on the inner side of the shell 100 and contains an electrolyte. The opening 102 is located on the top side of the receiving cavity 101 and is connected to the receiving cavity 101. The shell 100 can be made of aluminum, that is, the shell 100 can be an aluminum shell. The battery cell assembly 200 and the elastic plate 300 are both accommodated in the receiving cavity 101. The battery cell assembly 200 can be immersed in the electrolyte. The elastic plate 300 is located between the battery cell assembly 200 and the cavity wall of the receiving cavity 101, and pushes against the cavity wall of the receiving cavity 101 and the outer peripheral surface of the battery cell assembly 200. The top cover 400 is installed on the shell 100, closes the opening 102, and is electrically connected to the battery cell assembly 200.

[0033] See also Figure 3 , Figure 3 yes Figure 2 A schematic structural diagram of the housing 100 in the energy storage device 1000 is shown.

[0034] In this embodiment, the receiving cavity 101 is square in shape. The cavity walls of the receiving cavity 101 include two first cavity walls 103 and two second cavity walls 104. Along the width of the housing 100, the two first cavity walls 103 are spaced apart and disposed opposite each other. Along the length of the housing 100, the two second cavity walls 104 are spaced apart and disposed opposite each other. The two second cavity walls 104 are connected between the two first cavity walls 103. The area of ​​the first cavity walls 103 is larger than that of the second cavity walls 104.

[0035] See also Figure 4 , Figure 4 yes Figure 2 The schematic diagram of the structure of the battery cell assembly 200 in the energy storage device 1000 is shown. Figure 5 yes Figure 4 A schematic diagram of the exploded structure of the battery cell assembly 200 is shown.

[0036] The circumferential side surfaces of the battery cell assembly 200 are spaced apart from and opposite to the cavity wall surface of the accommodating cavity 101. Particularly, the distance between the circumferential side surfaces of the battery cell assembly 200 and the cavity wall surface of the accommodating cavity 101 is greater than or equal to 4 mm and less than or equal to 10 mm. Specifically, the circumferential side surfaces of the battery cell assembly 200 include two first side surfaces 201 and two second side surfaces 202. Along the width direction of the battery cell assembly 200, the two first side surfaces 201 are disposed back to back. Each first side surface 201 is spaced apart from and opposite to a first cavity wall surface 103. Along the length direction of the battery cell assembly 200, the two second side surfaces 202 are disposed back to back. Each second side surface is spaced apart from and opposite to a second cavity wall surface 104. Particularly, the area of ​​the first side surface 201 is greater than the area of ​​the second side surface 202.

[0037] In this embodiment, the battery cell assembly 200 includes a battery cell 210 and an insulating layer 220. The insulating layer 220 covers the battery cell 210 to provide insulation protection for the battery cell 210 and ensure the safety performance of the energy storage device 1000. There are two battery cells 210, and the two battery cells 210 are stacked along the width direction of the battery cell 210. The insulating layer 220 covers the two battery cells 210. The insulating layer 220 includes two first side surfaces 201 and two second side surfaces 202. The first side surfaces 201 and the second side surfaces 202 are both surfaces of the insulating layer 220 facing away from the battery cell 210. The insulating layer 220 can be Mylar film.

[0038] See also Figures 6 to 8 , Figure 6 yes Figure 2 The schematic structural diagram of the elastic plate 300 in the energy storage device 1000 is shown. Figure 7 Yes Figure 6 The schematic diagram of the exploded structure of the elastic plate 300 is shown. Figure 8 yes Figure 6 The structure diagram of the elastic plate 300 shown is from another angle.

[0039] In this embodiment, there are two elastic plates 300. Along the thickness direction of the battery cell assembly 200, the two elastic plates 300 are respectively located on opposite sides of the battery cell assembly 200, and are both located between the cavity wall surface of the receiving cavity 101 and the peripheral side surface of the battery cell assembly 200, and both push against the cavity wall surface of the receiving cavity 101 and the peripheral side surface of the battery cell assembly 200. Specifically, each elastic plate 300 is located between a first cavity wall surface 103 and a first side surface 201, and both push against a first cavity wall surface 103 and a first side surface 201. The elastic plates 300 can limit the movement of the battery cell assembly 200 within the receiving cavity 101, acting as a fixed support, preventing the battery cell assembly 200 from shaking freely within the housing 100, and improving the safety performance and service life of the battery cell.

[0040] Each elastic plate 300 includes a push plate 10 and a spring piece 20, and the spring piece 20 is fixedly connected to the push plate 10. The push plate 10 is in the shape of a flat plate, and pushes against the peripheral side surface of the battery cell assembly 200, wherein the push plate 10 pushes against a first side surface 201. The push plate 10 includes a first surface 11, a second surface 12 and two third side surfaces 13. Along the thickness direction of the push plate 10, the first surface 11 and the second surface 12 are arranged back to back. The first surface 11 is the surface of the push plate 10 facing the battery cell assembly 200, and pushes against the first side surface 201. The first surface 11 is in contact with the first side surface 201. The second surface 12 is the surface of the push plate 10 facing away from the battery cell assembly 200. Along the length direction of the push plate 10, the two third side surfaces 13 are arranged back to back and connected between the first surface 11 and the second surface 12. Each third side surface 13 can be flush with a second side surface 202.

[0041] The push plate 10 is provided with a relief groove 14. The relief groove 14 opens on the second surface 12. The relief groove 14 is recessed from the second surface 12 toward the first surface 11 and extends through both third side surfaces 13. In this embodiment, the longitudinal direction of the relief groove 14 is parallel to the longitudinal direction of the push plate 10. Multiple relief grooves 14 are provided, spaced apart and arranged sequentially along the height of the battery cell assembly 200.

[0042] It can be understood that the first surface 11 of the push plate 10 is a complete plane, and the first side surface 201 of the battery cell assembly 200 is the large surface of the battery cell assembly 200. The first surface 11 is in contact with the first side surface 201 and pushes against the first side surface 201. This not only ensures that the battery cell assembly 200 is evenly stressed during the charging and discharging process, but also prevents the push plate 10 from scratching the battery cell assembly 200 and damaging the battery cell assembly 200, thereby ensuring the safe use of the energy storage device 1000.

[0043] The spring clip 20 is fixedly connected to the second surface 12. In this embodiment, there are multiple spring clips 20, and along the width direction of the push plate 10 (that is, the height direction of the battery cell assembly 200), the multiple spring clips 20 are arranged in sequence. Each spring clip 20 is in the shape of a long strip. Each spring clip 20 includes a push portion 21, an assembly portion 22 and a connecting portion 23. The assembly portion 22 is fixedly connected to the second surface 12 and is spaced apart from a avoidance groove 14. The assembly portion 22 is in the shape of a flat plate, and the length direction of the assembly portion 22 is parallel to the length direction of the push plate 10. The assembly portion 22 includes an assembly surface 221, which is the surface of the assembly portion 22 facing the second surface 12, and the assembly surface 221 is attached to and fixedly connected to the second surface 12. The assembly surface 221 of the assembly portion 22 can be fixedly connected to the second surface 12 by laser welding.

[0044] Along the width direction of the spring piece 20, the pushing portion 21 and the assembly portion 22 are spaced apart, and along the height direction of the battery cell assembly 200, the pushing portion 21 and the assembly portion 22 are staggered. Specifically, the pushing portion 21 is spaced apart from the push plate 10, and is arranged opposite to the avoidance groove 14, and pushes the cavity wall surface of the accommodating cavity 101. Among them, the pushing portion 21 pushes the first cavity wall surface. In this embodiment, the pushing portion 21 is an arc-shaped curved plate, and the length direction of the pushing portion 21 is parallel to the length direction of the push plate 10. The pushing portion 21 includes a pushing surface 211. The pushing surface 211 is the surface of the pushing portion 21 facing away from the push plate 10. The pushing surface 211 abuts against the first cavity wall surface 103 of the outer shell 100. Among them, the pushing surface 211 is an arc surface, and the pushing surface 211 protrudes in the direction away from the push plate 10, and the radius of the pushing surface 211 can be R. The pushing surface 211 includes a guide portion 2111 close to the fitting portion 22 . The distance between the guide portion 2111 and the push plate 10 gradually increases in a direction from the fitting portion 22 to the pushing portion 21 .

[0045] The connecting portion 23 is planar and fixedly connected between the assembly portion 22 and the push portion 21. It forms an acute spring angle α with the push plate 10, which changes with the expansion of the battery cell assembly 200. The push portion 21, assembly portion 22, and connecting portion 23 of the spring 20 can be integrally formed. In this embodiment, the spring 20 can be made of a highly elastic metal such as spring steel or stainless steel. The material of the push plate is not limited, as long as it does not chemically react with the electrolyte.

[0046] See 9 and Figure 10 , Figure 9 yes Figure 1 The schematic cross-sectional structure diagram of the energy storage device 1000 is shown along the AA cross-sectional plane. Figure 10 yes Figure 9 FIG. 1 is a schematic structural diagram of the elastic plate 300 in the energy storage device 1000 during the compression process.

[0047] In this embodiment, the elastic plate 300 is disposed between the housing 100 and the battery cell assembly 200. Specifically, the pushing surface 211 of the pushing portion 21 abuts against the first cavity wall 103, and the first surface 11 of the push plate 10 fits the first side surface 201, thereby pushing against the battery cell assembly 200. During the assembly of the push plate 10 and the battery cell assembly 200 with the housing 100, the pushing portion 21 of the spring piece 20 interferes with the housing 100. The guide portion 2111 of the pushing surface 211 can guide the push plate 10 and the battery cell assembly 200 into the receiving cavity 101, thereby compressing the spring piece 20 of the elastic plate 300. The elastic angle α of the elastic plate 300 is reduced, thereby providing a pre-tightening force for the battery cell assembly 200. Moreover, since the pushing surface 211 in the pushing portion 21 that contacts the housing 100 is an arc surface, the contact area between the spring 20 and the housing 100 can be reduced, preventing the spring 20 from scratching the housing 100 to produce metal wires and metal chips, thereby ensuring the reliability of the energy storage device 1000.

[0048] When the energy storage device 1000 is charging, the battery cell assembly 200 expands and increases in volume. The battery cell assembly 200 will apply pressure to the push plate 10, causing the push plate 10 to move toward the housing 100. Since the first cavity wall 103 of the accommodating cavity 101 abuts the abutting portion 21, the connecting portion 23 of the spring 20 and the abutting portion 21 will move toward the push plate 10, the elastic angle α of the elastic plate 300 will decrease, and the abutting portion 21 will extend into the avoidance groove 14, which can not only avoid interference between the spring 20 and the push plate 10, but also reduce the thickness of the compressed elastic plate 300. When the elastic plate 300 is in the extreme compression state, the thickness of the spring 20 outside the push plate 10 can be the thickness of a single spring 20, which further increases the expansion space of the battery cell assembly 200 and improves the energy density of the energy storage device 1000. At this time, the spring piece 20 is compressed but still in an elastic state, and the elastic plate 300 can still push the outer peripheral surface of the battery cell assembly 200 and the cavity wall of the receiving cavity 101 to limit the movement of the battery cell assembly 200 in the receiving cavity 101.

[0049] When the energy storage device 1000 is discharged, the thickness and volume of the battery cell assembly 200 decrease, and the push plate 10 moves away from the housing 100. Since the push portion 21 abuts against the first cavity wall 103, the connecting portion 23 and the push portion 21 of the spring 20 will move away from the push plate 10, and the elastic angle α of the elastic plate 300 will increase. The elasticity of the elastic plate 300 can be restored, and a pre-tightening force is provided between the battery cell assembly 200 and the housing 100.

[0050] Therefore, under the action of the spring 20, the elastic plate 300 can adaptively move with the expansion of the battery cell assembly 200 to meet the size change of the battery cell assembly 200 after expansion, and provide a pre-tightening force between the battery cell assembly 200 and the shell 100. Regardless of the expansion of the battery cell assembly 200, the elastic plate 300 can play a role of fixed support for the battery cell assembly 200 to limit the movement of the battery cell assembly 200 in the accommodating cavity 101, avoid damage to the battery cell assembly 200 due to collision with the shell 100, ensure the assembly stability of the battery cell assembly 200 in the shell 100, and improve the service life of the energy storage device 1000.

[0051] This application also provides an electrical device, which includes the energy storage device 1000 of the above embodiment. Since the specific structure and technical effects of the energy storage device 1000 have been described in detail above, they will not be repeated here. The electrical device provided in this embodiment, by providing the above energy storage device, can maximize the service life of the electrical device.

[0052] The above are only optional embodiments of the present application. The description of the above embodiments is only used to help understand the core idea of ​​the present application, and does not limit the patent scope of the present application. At the same time, for those skilled in the art, based on the inventive concept of the present application, equivalent structural transformations made using the description and drawings of the present application, or direct / indirect application in other related technical fields are all included in the patent protection scope of the present application.

Claims

1. An energy storage device, characterized in that: The battery pack comprises a shell, a battery cell assembly and an elastic plate, wherein the shell is provided with a receiving cavity, the receiving cavity is located on the inner side of the shell, the battery cell assembly and the elastic plate are both located in the receiving cavity, the peripheral side surface of the battery cell assembly is spaced apart from and arranged relative to the cavity wall surface of the receiving cavity, the peripheral side surface of the battery cell assembly comprises two first side surfaces and two second side surfaces, along the width direction of the battery cell assembly, the two first side surfaces are arranged back to back, along the length direction of the battery cell assembly, the two second side surfaces are arranged back to back, and the two second side surfaces are connected between the two first side surfaces, and the area of ​​the first side surface is large In the area of ​​the second side surface, the elastic plate is located between the first side surface and the cavity wall surface of the accommodating cavity, the elastic plate includes a push plate and a spring plate, the push plate pushes the first side surface, the spring plate is located on the side of the push plate away from the battery cell assembly, the spring plate includes an assembly part, a pushing part and a connecting part, the assembly part is fixedly connected to the push plate, along the height direction of the battery cell assembly, the pushing part and the assembly part are staggered, the pushing part and the assembly part are spaced apart, and push the cavity wall surface of the accommodating cavity, and the connecting part is fixedly connected between the assembly part and the pushing part.

2. The energy storage device according to claim 1, characterized in that There are at least two elastic plates, and the two elastic plates are respectively located on two opposite sides of the battery core assembly.

3. The energy storage device according to claim 1 or 2, characterized in that: The push plate includes a first surface and a second surface, the first surface is the surface of the push plate facing the battery cell assembly and pushing the first side surface of the battery cell assembly, and the second surface is arranged opposite to the first surface; The push plate is provided with an avoidance groove, the opening of the avoidance groove is located on the second surface and is arranged opposite to the pushing portion.

4. The energy storage device according to claim 1 or 2, characterized in that: The pushing portion includes a pushing surface facing away from the pushing plate, wherein the pushing surface is an arc surface, protrudes in a direction away from the pushing plate, and pushes against the cavity wall surface of the accommodating cavity.

5. The energy storage device according to claim 4, characterized in that The pushing surface includes a guide portion close to the fitting portion, and a distance between the guide portion and the push plate gradually increases in a direction from the fitting portion toward the pushing portion.

6. The energy storage device according to claim 1, characterized in that The connecting portion and the push plate form an elastic angle, which is an acute angle.

7. The energy storage device according to claim 1, characterized in that There are a plurality of spring pieces, and the spring pieces are arranged in sequence and spaced apart along the height direction of the shell.

8. The energy storage device according to claim 6 or 7, characterized in that: The material of the spring piece is spring steel or stainless steel metal material.

9. The energy storage device according to claim 1, characterized in that The pushing portion, the assembling portion and the connecting portion are integrally formed.

10. An electrical device, characterized in that: The energy storage device comprises the energy storage device according to any one of claims 1 to 9, wherein the energy storage device is used to supply power to the electrical equipment.

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