Electricity storage device and electric equipment with same

Abstract

The embodiment of the utility model relates to an electricity storage device and electric equipment with the same. The power storage device comprises a shell, a battery module, a heat insulation pad, a pressing plate and an electric cover plate assembly. The shell comprises a plurality of side walls and a bottom wall, and the side walls and the bottom wall jointly define a containing cavity with an opening. The battery module comprises a plurality of battery cells stacked in the height direction of the shell, and at least part of the battery module is located in the containing cavity. The heat insulation pad is located on one side of the battery module back to the bottom wall. The pressing plate is located on the side, back to the battery module, of the heat insulation pad, and the pressing plate is fixedly connected with at least one side wall in the multiple side walls. The electric cover plate assembly is located on the side, opposite to the heat insulation pad, of the pressing plate and arranged on the opening. The electric cover plate assembly comprises a circuit board electrically connected with the battery module. According to the embodiment of the utility model, the heat insulation pad is positioned between the battery module and the electric cover plate assembly, so that heat generated by the battery module can be prevented from being transmitted to the circuit board, and the safety of the circuit board is ensured.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular, to an energy storage device and an electrical appliance having the same. Background Technology

[0002] Energy storage devices, such as battery packs, are important components of electrical devices, such as vehicles. Energy storage devices include battery modules and a battery management system (BMS). A battery module can include multiple battery cells, which are the energy storage units of the energy storage device. The BMS monitors and manages the operating status of the battery cells, such as voltage, current, and temperature. When the BMS detects an abnormal operating status of a battery cell, the circuit board in the BMS will execute corresponding protection measures according to the set protection strategy.

[0003] However, the battery module releases heat during charging, discharging, or high-load conditions. This heat is transferred to the circuit board, causing the circuit board temperature to rise, which in turn affects the circuit board's performance and reliability. Utility Model Content

[0004] In view of this, the present invention provides an energy storage device and an electrical device having the same, aiming to improve the safety and reliability of the energy storage device.

[0005] On one hand, the energy storage device provided in this embodiment includes a housing, a battery module, a heat insulation pad, a pressure plate, and an electric cover assembly. The housing includes multiple side walls and a bottom wall, which together enclose an accommodating cavity with an opening. The battery module includes multiple battery cells stacked along the height direction of the housing, with at least a portion of the battery module located within the accommodating cavity. The heat insulation pad is located on the side of the battery module facing away from the bottom wall. The pressure plate is located on the side of the heat insulation pad facing away from the battery module, and is fixedly connected to at least one of the multiple side walls. The electric cover assembly is located on the side of the pressure plate facing away from the heat insulation pad, and covers the opening, and is electrically connected to the battery module.

[0006] According to an embodiment of this utility model, the heat insulation pad is located between the battery module and the cover plate assembly, that is, between the battery module and the circuit board. Therefore, this implementation can prevent the heat generated by the battery module during operation from being transferred to the circuit board, thereby ensuring the safety and reliability of the circuit board. Furthermore, through the cooperation of the pressure plate and the bottom wall, multiple battery cells can be confined between the pressure plate and the bottom wall, which helps ensure that the battery module remains in a fixed position during operation.

[0007] As one possible implementation, the battery module also includes a tab support. Each of the multiple battery cells includes a cell body and a tab, which is connected to the tab support. The tab support is located between any one of the multiple sidewalls and the battery module. The pressure plate includes a plate-like portion and a bent portion. The plate-like portion and the cell body are located on the same side of the tab support in the thickness direction. One end of the bent portion is connected to the plate-like portion, and the other end protrudes towards the side opposite to the bottom wall and bypasses the tab support to be fixedly connected to the side wall. At least a portion of the tab support is surrounded by the bent portion.

[0008] According to the embodiment of this utility model, the side of the bent part facing away from the bottom wall protrudes and is fixedly connected to the side wall around one end of the electrode bracket, so that the pressure plate can be supported on the side wall. This method of implementation does not require additional support structure for the pressure plate in the width direction of the electrode bracket, which not only simplifies the assembly steps, but also effectively reduces the size of the housing in the width direction of the electrode bracket.

[0009] As one possible implementation, the plate-shaped portion has a first recess protruding towards the side where the heat insulation pad is located, and the first recess abuts against the side wall of the multiple battery cells.

[0010] The protruding first recess helps to evenly distribute the externally applied load on the plate-like portion, thereby reducing the risk of localized damage or deformation and enhancing the overall structural strength. Furthermore, the first recess contacts the cell wall, providing support and fixation for the cell, reducing movement or damage to the cell under vibration or external forces, thus enhancing the overall structural stability of the battery module.

[0011] As one possible implementation, multiple bends are arranged at intervals along the width direction of the tab support. Each of the multiple bends includes multiple extension segments connected in sequence, any two extension segments that are connected form an included angle, and a second recess is provided at the connection point of the two extension segments.

[0012] Compared to constructing a single bend, arranging multiple bends at intervals effectively reduces weight and disperses stress during use, contributing to improved overall stability of the support structure. Multiple extensions connected at angles to form a polygonal structure effectively distributes external forces, ensuring overall structural strength. Furthermore, the addition of a second recess at the connection point enhances local compressive strength, preventing deformation caused by concentrated external forces.

[0013] As one possible implementation, the battery module also includes a nut bracket integrally formed with the tab bracket, the nut bracket protruding from the tab bracket and avoiding multiple bends.

[0014] The nut bracket and the electrode lug bracket are integrated into one piece, which reduces the number of components and assembly complexity. In addition, by designing the nut bracket to avoid multiple bends, interference between the nut bracket and the bends can be effectively avoided during the installation of the pressure plate.

[0015] As one possible implementation, the battery module also includes a bus that is electrically connected to the tabs, the bus including an extension located between the tab support and a plurality of bends, the extension being fitted with an insulating sleeve.

[0016] The insulating sleeve effectively isolates current and prevents current leakage. By fitting an insulating sleeve onto the extension, it prevents other metal components (such as pressure plates) from accidentally contacting the busbar during installation, thus avoiding short circuits. This reduces the risk of electrical failures and ensures stable operation of the battery module.

[0017] The battery cover assembly includes a circuit board and a top cover. The top cover has a cavity inside, and the circuit board is located inside the cavity and electrically connected to the battery module.

[0018] The design of the top cover covering the circuit board effectively saves space and reduces the size of the energy storage device. Furthermore, after the cover assembly is installed over the opening, the circuit board can be electrically connected to the battery module while simultaneously connecting the top cover to multiple sidewalls. This approach allows two installation steps to be completed simultaneously on the same working surface, greatly simplifying the assembly process. By reducing steps and avoiding separate installations, assembly time can be reduced, lowering overall production costs.

[0019] As one possible implementation, the distance from the heat insulation pad to the tab support is less than the distance from the plate to the tab support.

[0020] Since the end of the plate-shaped portion near the tab support is connected to the bent portion, the distance between the plate-shaped portion and the tab support can be appropriately increased to reserve installation space for the bent portion. On the other hand, after the current passes through the tab, some electrical energy is converted into heat energy, causing the tab to heat up. To prevent heat near the tab from concentrating and bypassing the heat insulation pad to be transferred to the circuit board, the heat insulation pad can be appropriately extended towards the tab support, that is, its distance to the tab support can be shortened. According to the embodiment of this utility model, the distance from the heat insulation pad to the tab support is less than the distance from the plate-shaped portion to the tab support, which can effectively block the heat generated by the battery module during operation from being transferred to the circuit board, ensuring the safety and reliability of the circuit board. At the same time, it can reserve sufficient installation space for the bent portion to ensure that the pressure plate can be installed in place.

[0021] As one possible implementation, the battery module also includes a tab support, with each of the multiple cells including a cell body and a tab connected to the tab support, the tab support being located between any of the multiple sidewalls and the battery module. The energy storage device also includes a nut support integrally formed with the pressure plate, the nut support protruding from the pressure plate toward the side of the pressure plate facing away from the bottom wall.

[0022] The nut bracket and pressure plate are integrally molded, which can reduce the number of components, simplify the assembly steps, and reduce assembly time.

[0023] On the other hand, this utility model embodiment also provides an electrical device, which includes the energy storage device mentioned above. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below.

[0025] It should be understood that the following figures only show some embodiments of the present invention and should not be regarded as a limitation on the scope.

[0026] It should also be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.

[0027] It should also be understood that the accompanying drawings are only schematic, and the dimensions and scales of the elements in the drawings are not necessarily precise.

[0028] Figure 1 This is a schematic diagram of the electrical device according to an embodiment of the present invention.

[0029] Figure 2 yes Figure 1 A schematic diagram of the energy storage device in the diagram.

[0030] Figure 3 yes Figure 2 An exploded view of the energy storage device.

[0031] Figure 4 yes Figure 2 A schematic diagram of the battery module and pressure plate in the diagram.

[0032] Figure 5 yes Figure 4 Side view of the battery module and pressure plate.

[0033] Figure 6 yes Figure 5 A schematic diagram of the structure of part A.

[0034] Figure 7 yes Figure 2 A schematic diagram of the pressure plate structure.

[0035] Figure 8 yes Figure 2 A partial structural diagram of the battery module.

[0036] Figure 9 yes Figure 3 Cross-sectional view of the connection between the circuit board and the tab bracket.

[0037] Figure 10 This is a schematic diagram of the battery module and pressure plate in another embodiment of the present invention.

[0038] Figure 11 yes Figure 10 Side view of the battery module and pressure plate. Detailed Implementation

[0039] The embodiments of the present invention will now be described by way of example with reference to the accompanying drawings. It should be understood that there are many ways to implement the present invention, and it should not be construed as being limited to the embodiments described herein. The embodiments described herein are only for a more thorough and clear understanding of the present invention.

[0040] This utility model provides an electrical device 200. For example, the electrical device 200 provided by this utility model can be a car. Of course, the electrical device 200 provided by this utility model is not limited to a car. The electrical device 200 provided by this utility model can be any type of electrical device, such as an energy storage station or a power tool.

[0041] The energy storage device 100 provided by this utility model can be a start-stop battery pack, a low-voltage battery pack, a power battery pack, or an energy storage module, etc.

[0042] refer to Figure 1 Electrical device 200 includes an energy storage device 100. The energy storage device 100 is equipped with a battery management system (BMS), which monitors and manages the operating status of the battery cells, such as voltage, current, and temperature. When the battery management system detects an abnormal operating status of a battery cell, the circuit board 21 in the battery management system executes corresponding protection measures according to the set protection strategy. For example, when the voltage reaches a set overcharge voltage, the circuit board controls the switch to open, cutting off the charging circuit to prevent overcharging; when the voltage is lower than a set discharge lower limit, the circuit board controls the switch to disconnect the load, limiting current flow and avoiding over-discharge. Similarly, when the temperature of the battery cell is too high, the circuit board reduces the charging or discharging rate to ensure that the battery temperature remains within a safe range. If the temperature continues to rise, the circuit board controls the switch to disconnect the load to prevent the temperature from rising further.

[0043] The battery modules in the energy storage device 100, especially lithium batteries or high-energy-density batteries, release heat under charging, discharging, or high-load conditions. If this heat is not effectively managed, it may be transferred to the circuit board, causing its temperature to rise and thus affecting the performance and reliability of the circuit board.

[0044] In view of this, the present invention provides an energy storage device 100, which aims to improve the safety and reliability of an electrical device 200 having the energy storage device 100.

[0045] See Figure 2 and Figure 3 The energy storage device 100 includes a battery module 10, an electric cover assembly 20, and a housing 30.

[0046] refer to Figure 2 , Figure 3 and Figure 5 The battery module 10 may include multiple battery cells 11, each battery cell 11 being an energy storage unit of the energy storage device 100. The battery cover assembly 20 includes a circuit board 21 and a top cover 22. The housing 30 includes four side walls 31 and a bottom wall 32, which together enclose a receiving cavity 34 with an opening 33. The multiple battery cells 11 are stacked along the height direction of the housing 30 and are at least partially located in the receiving cavity 34. The top cover 22 is secured to the four side walls 31 by multiple fasteners 24 to close the opening 33.

[0047] Circuit board 21 can be mounted outside or inside the receiving cavity 34. (See reference) Figure 3 The top cover 22 is recessed upwards and covers the circuit board 21. In this way, both the battery module 10 and the circuit board 21 are located in the accommodating cavity 34, and the circuit board 21 can be supported by the top cover 22 without the need for additional support structures, thus saving space and reducing the volume of the energy storage device 100.

[0048] Continue to refer to Figure 3 The circuit board 21 has a first mounting hole 211, and the top cover 22 has a second mounting hole 221. After the cover plate assembly 20 is placed over the opening 33, the bolt 23 can electrically connect the circuit board 21 to the battery module 10 through the first mounting hole 211, and the fastener 24 can fix the top cover 22 to the side wall 31 through the second mounting hole 221. This implementation method allows the two installation steps to be completed on the same operating surface, which greatly simplifies the assembly process, reduces assembly time, and thus reduces the overall production cost.

[0049] refer to Figures 3 to 5Each of the multiple battery cells 11 includes a cell body 111 and a tab 112. The battery module 10 may also include a tab support 12 and a bus 13. Both the tab 112 and the bus 13 are supported by the tab support 12, which is located between any one of the four side walls 31 and the battery module 10. One end of the bus 13 is electrically connected to the tab 112, and the other end is electrically connected to an external circuit, that is, to the circuit board 21.

[0050] It is understood that the directional descriptions above are relative rather than absolute. These directional descriptions apply when the elements of this utility model are in the placement posture and position shown in the figures. In the figures of this utility model, arrows Z+ and Z- are used to indicate opposite sides in the height direction; arrow X is used to indicate the width direction of the electrode bracket, which is perpendicular to the height direction; arrow Y is used to indicate the thickness direction of the electrode bracket, which is perpendicular to both the width and height directions of the electrode bracket.

[0051] Continue to refer to Figure 3 The energy storage device 100 also includes a heat insulation pad 40 and a pressure plate 50. The heat insulation pad 40 is located on the side of the battery module 10 facing away from the bottom wall 32. The pressure plate 50 is located on the side of the heat insulation pad 40 facing away from the battery module 10, and the pressure plate 50 is fixedly connected to at least one of the plurality of side walls 31. The cover plate assembly 20 is located on the side of the pressure plate 50 facing away from the heat insulation pad 40. The heat insulation pad 40 is located between the battery module 10 and the cover plate assembly 20, that is, between the battery module 10 and the circuit board 21. Therefore, this implementation can prevent the heat generated by the battery module 10 during operation from being transferred to the circuit board 21, thereby ensuring the safety and reliability of the circuit board 21.

[0052] Furthermore, the cooperation between the pressure plate 50 and the bottom wall 32 allows multiple battery cells 11 to be confined between them. This helps ensure that the battery module 10 remains in a fixed position during operation, preventing displacement of the cells due to vibration. Moreover, when the pressure plate 50 and the bottom wall 32 apply appropriate clamping force to the battery module 10, it facilitates contact between the electrode materials and the electrolyte. For example, in lithium batteries, good contact ensures that lithium ions migrate smoothly between the electrodes during charging and discharging, rather than depositing as metallic lithium on the negative electrode surface.

[0053] It is understood that the material of the heat insulation pad 40 needs to have good heat insulation performance. Optional materials include ceramics, silicone, polytetrafluoroethylene, or ceramic fiber cloth composite silicone rubber, etc. This utility model does not impose any particular limitations in this regard.

[0054] refer to Figure 5 and Figure 7The pressure plate 50 may include a plate-shaped portion 51 and a bent portion 52, with the plate-shaped portion 51 and the cell body 111 located on the same side of the electrode bracket 12 in the thickness direction. Figure 3 One end of the bent portion 52 is connected to the plate-shaped portion 51, and the other end protrudes towards the side opposite to the bottom wall 32 and passes around the tab support 12 to be fixedly connected to the side wall 31. The bent portion 52 and the side wall 31 are located on opposite sides of the thickness direction of the tab support 12, and at least a portion of the tab support 12 is surrounded by the bent portion 52. According to this embodiment of the present invention, the end of the bent portion 52 that protrudes towards the side opposite to the bottom wall 32 and passes around the tab support 12 is fixedly connected to the side wall 31, which can support the pressure plate 50 on the side wall 31. This implementation method does not require an additional support structure for the pressure plate 50 in the width direction of the tab support 12, which not only simplifies the assembly steps but also effectively reduces the size of the housing 30 in the width direction of the tab support 12.

[0055] It is understood that in some other embodiments, the end of the plate-shaped portion 51 facing away from the bent portion 52 can be fixedly connected to the other side wall, wherein the two side walls connecting the plate-shaped portion 51 and the bent portion 52 are spaced apart along the thickness direction of the tab support 12.

[0056] refer to Figure 5 and Figure 6 Since the end of the plate-shaped portion 51 near the tab support 12 is connected to the bent portion 52, the distance D1 between the plate-shaped portion 51 and the tab support 12 can be appropriately increased to reserve installation space for the bent portion 52. On the other hand, after the current passes through the tab 112, some of the electrical energy is converted into heat energy, causing the tab 112 to heat up. In order to prevent the heat near the tab 112 from concentrating and bypassing the heat insulation pad 40 to be transferred to the circuit board 21, the heat insulation pad 40 can be appropriately extended towards the tab support 12, that is, its distance D2 from the tab support 12 can be shortened.

[0057] According to the embodiment of this utility model, the distance between the heat insulation pad 40 and the plate-shaped part 51 to the tab bracket 12 is configured as D1>D2, which can effectively block the heat generated by the battery module 10 during operation from being transferred to the circuit board 21, ensuring the safety of the circuit board 21. At the same time, it can reserve sufficient installation space for the bending part 52 to ensure that the pressure plate 50 is installed in place.

[0058] refer to Figure 6 and Figure 7The plate-shaped portion 51 has a first recess 511 protruding towards the side where the heat insulation pad 40 is located. The first recess 511 abuts against the side wall 31 of the multiple battery cells 11. The protruding first recess 511 helps the plate-shaped portion 51 to evenly distribute the externally applied load, thereby reducing the risk of local damage or deformation and enhancing the overall structural strength. In addition, the contact between the first recess 511 and the wall of the battery cell 11 can provide support and fixation for the battery cell 11, reducing the movement or damage of the battery cell 11 under vibration or external force, thereby enhancing the overall structural stability of the battery module 10.

[0059] refer to Figure 7 Multiple bends 52 are spaced apart along the width of the tab support 12. Each bend 52 includes multiple sequentially connected extension segments 521. Any two connected extension segments 521 form an included angle, and a second recess 522 is provided at the connection point of the two extension segments 521. Compared to constructing only a single bend 52, the spaced arrangement of multiple bends 52 can effectively reduce weight and disperse stress during use, thus helping to improve the overall stability of the support. The multiple extension segments 521 connected at the included angle form a polygonal structure, which can effectively disperse external forces and ensure the strength of the overall structure. In addition, the second recess 522 at the connection point can improve local compressive strength and avoid deformation caused by concentrated external forces.

[0060] It is understandable that, in order to improve the overall structural strength, the concave direction of the second recess 522 needs to be restricted, that is, the second recess 522 is concave towards the concave corner at the junction of the two extensions 521.

[0061] It is understood that the pressure plate 50 can be a thin-walled steel component. Steel has high rigidity, which can effectively resist external loads and reduce the possibility of significant deformation of the pressure plate 50, thereby ensuring the strength and structural stability of the pressure plate 50. At the same time, steel has good plasticity and can be formed by stamping, bending and other methods, which is suitable for constructing the first recess 511 and the second recess 522 in the embodiments of this utility model.

[0062] refer to Figures 3 to 5 The battery module 10 also includes a nut bracket 14 integrally formed with the tab bracket 12. The nut bracket 14 protrudes from the tab bracket 12 away from the bottom wall 32 and avoids multiple bends 52. The nut bracket 14 is integrally formed with the tab bracket 12, which can reduce the number of components and reduce assembly complexity. In addition, by designing the nut bracket 14 to avoid multiple bends 52, interference between the nut bracket 14 and the bends 52 can be avoided during the installation of the pressure plate 50.

[0063] refer to Figure 4 and Figure 8 The busbar 13 includes an extension 131 located between the tab support 12 and multiple bends 52, and an insulating sleeve 15 is fitted onto the extension 131. The insulating sleeve 15 effectively isolates current and prevents current leakage. Fitting the extension 131 with the insulating sleeve 15 prevents other metal components (e.g., pressure plate 50) from accidentally contacting the busbar 13 during installation, thus avoiding a short circuit. This implementation reduces the risk of electrical failures and ensures stable operation of the battery module 10.

[0064] It should be noted that during installation, one end of the extension 131 needs to be electrically connected to the tab 112, and the insulating sleeve 15 cannot be fitted. In order to prevent the pressure plate 50 from accidentally contacting the part of the extension 131 exposed outside the insulating sleeve 15 during installation and causing a short circuit, an insulating material, such as epoxy resin, polyurethane or polytetrafluoroethylene, can be sprayed on the surface of the pressure plate 50.

[0065] Continue to refer to Figure 8 and Figure 9 The other end of the extension 131 of the busbar 13 is located on the upper part of the nut bracket 14 and is provided with a third mounting hole 132. The nut bracket 14 is provided with an upward-opening fourth mounting hole 141. Figure 3 After passing through the first mounting hole 211, the third mounting hole 132 and the fourth mounting hole 141, the bolt 23 can cooperate with the nut 60 in the nut bracket 14 to electrically connect the circuit board 21 to the battery module 10.

[0066] It should be understood that there are multiple ways to implement the energy storage device 100 of this utility model, and it should not be construed as being limited to the embodiments described above. The following, in conjunction with... Figure 10 and Figure 11 The following are illustrative examples of variations of this utility model. It should be noted that the foregoing embodiments and the following variations share some common elements. In the following variations, these elements will use the same reference numerals as in the foregoing embodiments to omit repeated descriptions.

[0067] refer to Figure 10 and Figure 11 The pressure plate 50a is plate-shaped and has a notch 53. The tab bracket 12a extends into the notch 53.

[0068] To enhance the structural strength of the pressure plate 50a, the pressure plate 50a may be provided with ribs 54, for example, they may be provided on the surface of the pressure plate 50a facing away from the bottom wall 32. As an example, refer to... Figure 10 Ribs 54 may include perpendicularly intersecting transverse ribs and longitudinal ribs. It is understood that the material of the pressure plate 50a may be polypropylene, polycarbonate, etc. This utility model does not impose any particular limitation in this regard.

[0069] The energy storage device 100a also includes a nut bracket 14a integrally formed with the pressure plate 50a. The nut bracket 14a protrudes from the pressure plate 50a toward the side of the pressure plate 50a facing away from the bottom wall 32. The nut bracket 14a is integrally formed with the pressure plate 50a, which can reduce the number of components, simplify the assembly steps, and reduce the assembly time.

[0070] It should be understood that there can be two nut brackets 14 or 14a, which are respectively connected to the main positive terminal and the main negative terminal of the battery module.

[0071] It should be understood that the term "comprising" and its variations used in the embodiments of this utility model are open-ended, meaning "including but not limited to". The term "according to" means "at least in part according to". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least another embodiment".

[0072] It should be understood that although terms such as "first" or "second" may be used in embodiments of the present invention to describe various elements (such as the first recess and the second recess), these elements are not defined by these terms, which are only used to distinguish one element from another.

[0073] The protection scope of this utility model embodiment is not limited to the above embodiments. Any variations or substitutions that can be conceived by those skilled in the art within the technical scope disclosed in this utility model embodiment should be included within the protection scope of this utility model embodiment. Therefore, the protection scope of this utility model embodiment should be determined by the protection scope of the claims.

Claims

1. An energy storage device, characterized in that, include: The housing includes multiple side walls and a bottom wall, which together enclose a receiving cavity with an opening; A battery module, at least a portion of which is located within the accommodating cavity, the battery module comprising a plurality of cells stacked along the height direction of the housing; A heat insulation pad is located on the side of the battery module facing away from the bottom wall; A pressure plate is located on the side of the heat insulation pad facing away from the battery module, and the pressure plate is fixedly connected to at least one of the plurality of side walls; An electrical cover assembly is located on the side of the pressure plate facing away from the heat insulation pad. The electrical cover assembly covers the opening and is electrically connected to the battery module.

2. The energy storage device according to claim 1, characterized in that, The battery module further includes a tab bracket, and each of the plurality of battery cells includes a cell body and a tab. The tab is connected to the tab bracket, and the tab bracket is located between any one of the plurality of side walls and the battery module. The pressure plate includes a plate-shaped portion and a bent portion. The plate-shaped portion and the battery cell body are located on the same side in the thickness direction of the tab support. One end of the bent portion is connected to the plate-shaped portion, and the other end protrudes toward the side opposite to the bottom wall and passes around the tab support to be fixedly connected to the side wall. At least part of the tab support is surrounded by the bent portion.

3. The energy storage device according to claim 2, characterized in that, The plate-shaped portion has a first recessed portion protruding toward the side where the heat insulation pad is located, and the first recessed portion abuts against the side wall of the plurality of battery cells.

4. The energy storage device according to claim 2, characterized in that, The plurality of the bending portions are arranged at intervals along the width direction of the electrode bracket; Each of the plurality of bends includes a plurality of extension segments connected in sequence, wherein any two extension segments connected in sequence form an included angle, and a second recess is provided at the connection point of the two extension segments.

5. The energy storage device according to claim 2, characterized in that, It also includes a nut bracket integrally formed with the electrode bracket, the nut bracket protruding from the electrode bracket and avoiding the plurality of bends.

6. The energy storage device according to claim 5, characterized in that, It also includes a busbar electrically connected to the tab, the busbar including an extension located between the tab support and the plurality of bends, the extension being fitted with an insulating sleeve.

7. The energy storage device according to claim 6, characterized in that, The battery cover assembly includes a circuit board and a top cover. The top cover has a cavity inside, and the circuit board is located inside the cavity and electrically connected to the battery module.

8. The energy storage device according to claim 2, characterized in that, The distance from the heat insulation pad to the electrode bracket is less than the distance from the plate-shaped portion to the electrode bracket.

9. The energy storage device according to claim 1, characterized in that, The battery module further includes a tab bracket, and each of the plurality of battery cells includes a cell body and a tab. The tab is connected to the tab bracket, and the tab bracket is located between any one of the plurality of side walls and the battery module. The energy storage device further includes a nut bracket integrally formed with the pressure plate, and the nut bracket protrudes from the pressure plate toward the side of the pressure plate facing away from the bottom wall.

10. An electrical appliance, characterized in that, Includes the energy storage device according to any one of claims 1 to 9.

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