Energy storage device and electric equipment

Abstract

The invention discloses an energy storage device and electric equipment, the energy storage device comprises a battery module and a box body, and the battery module is assembled in the box body; the battery module comprises two brackets, a plurality of electric connecting sheets, a positive electrode connecting sheet, a negative electrode connecting sheet, a plurality of battery packs, two reinforcing plates, two insulating plates and insulating sheets, the plurality of battery packs are provided with top sides and bottom sides, the two brackets are respectively positioned on the top sides and the bottom sides, and the plurality of battery packs are electrically connected through the plurality of electric connecting sheets and are exposed out of the brackets; the two insulating plates are stacked on the sides, back to the battery pack, of the two supports respectively and abut against the electric connecting pieces, the two reinforcing plates are stacked on the sides, back to the battery pack, of the two insulating plates respectively, and the insulating pieces are stacked on the two sides of the reinforcing plate located on the top side and abut against the battery pack in the height direction of the battery module. The two supports, the two reinforcing plates, the two insulating plates and the insulating sheet are fixedly connected through screw joint, and the positive electrode connecting sheet and the negative electrode connecting sheet both penetrate through the reinforcing plate, the insulating plate and the insulating sheet which are located on the top side.

Description

Technical Field

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

[0002] With the advancement of science and technology, the consumer demand for low-speed power vehicles has gradually increased, and therefore, higher requirements have been placed on the performance of low-speed power vehicles. In the existing technology of low-speed power vehicles, the internal integration of energy storage devices is high and the energy density is large, but the structural strength of the energy storage device will be affected, resulting in poor stability during use. Summary of the invention

[0003] The embodiments of the present application provide an energy storage device and an electrical device, which solve the technical problem that the energy storage device has a high internal integration and a high energy density, thereby affecting the structural strength of the energy storage device and causing poor stability during use.

[0004] The first aspect of the present application provides an energy storage device, which is applied to electrical equipment. The energy storage device includes a battery module and a box body, wherein the battery module is assembled in the box body; the battery module includes two brackets, multiple electrical connecting plates, positive connecting plates and negative connecting plates, several battery packs, two reinforcing plates, two insulating plates and insulating plates, and the several battery packs have a top side and a bottom side arranged opposite to the top side. Each bracket is provided with a plurality of battery accommodating holes arranged in a matrix and two hollow parts. Along the thickness direction of the bracket, the several battery accommodating holes and the two hollow parts all penetrate the bracket, and the two hollow parts are located between the several battery accommodating holes and are arranged at intervals; each of the battery packs includes a plurality of single cells, and the single cells of the several battery packs correspond one-to-one to the several battery accommodating holes, and the single cells of the several battery packs are penetrated and limited to the battery accommodating holes, and the two brackets are respectively located on the top side. and the bottom side, several battery packs are electrically connected through multiple electrical connecting sheets and expose the bracket, the positive connecting sheet and the negative connecting sheet are both electrically connected to one of the battery packs, and the positive connecting sheet and the negative connecting sheet are the positive and negative electrodes of the battery module, wherein multiple electrical connecting sheets are distributed on the top side and the bottom side; the two insulating plates are respectively stacked on the side of two brackets facing away from the battery pack and abut against the electrical connecting sheets, the two reinforcing plates are respectively stacked on the side of two insulating plates facing away from the battery pack, the insulating sheet is stacked on the reinforcing plate located on the top side, the two brackets, the two reinforcing plates, the two insulating plates and the insulating sheet are fixedly connected by screwing along the height direction of the battery module; along the height direction of the battery module, the positive connecting sheet and the negative connecting sheet both pass through the reinforcing plate, the insulating plate and the insulating sheet located on the top side.

[0005] Among them, the two reinforcing plates and the insulating plates are also provided with two avoidance openings, and the two insulating plates are provided with two limiting holes. The two avoidance openings of the reinforcing plates are arranged at intervals along the length direction of the battery module, and the two limiting holes of the insulating plates are arranged at intervals along the length direction of the battery module. The two avoidance openings of the insulating plates are arranged at intervals along the length direction of the battery module, and the avoidance openings of the two reinforcing plates and the insulating plates and the limiting holes of the two insulating plates correspond one to one along the height direction of the battery module; the positive connecting plate and the negative connecting plate both include a bending portion and a base portion, the bending portion is located on one side of the base portion and is connected to the base portion at an angle, and the bending portions of the positive connecting plate and the negative connecting plate respectively extend through the avoidance openings and the two limiting holes of the two reinforcing plates and the insulating plates.

[0006] Wherein, the insulating sheet includes a first insulating sheet and a second insulating sheet, the first insulating sheet is stacked on the side of the reinforcing plate located on the top side facing away from the battery module, the second insulating sheet is stacked between the insulating plate located on the top side and the bracket, and the second insulating sheet is abutted against the electrical connecting sheet; the thickness of the base portion of the positive connecting sheet and the base portion of the negative connecting sheet is equal to the sum of the thickness of the second insulating sheet and the electrical connecting sheet.

[0007] Among them, the hollow part includes a plurality of holes, and the plurality of holes and the plurality of hollow parts are arranged in a matrix. The hollow part includes a first hollow part and a second hollow part, and the first hollow part and the second hollow part are arranged at intervals along the length direction of the energy storage device, and the first hollow part and the second hollow part are close to the opposite ends of the bracket.

[0008] Wherein, the two reinforcement plates are both metal plates.

[0009] Among them, the reinforcing plate includes a first reinforcing plate, the first reinforcing plate includes a first substrate and several positioning edges, the several positioning edges are respectively a first edge, a second edge, a third edge and a fourth edge, along the periphery of the first substrate, the first edge, the second edge, the third edge and the fourth edge are arranged at intervals, the first edge and the fourth edge are located on opposite sides of the first substrate, and the first edge is located between the two avoidance openings of the first reinforcing plate; the second edge and the third edge are located at opposite ends of the first substrate, and the first edge, the second edge, the third edge and the fourth edge surround the first insulating sheet.

[0010] Wherein, the energy storage device also includes a circuit board and a circuit board adapter, the circuit board adapter is stacked on the side of the first insulating sheet facing away from the battery pack, the circuit board is installed on the side of the circuit board adapter facing away from the first insulating sheet, and the circuit board adapter is fixedly connected to the first insulating sheet.

[0011] Wherein, the box body is mainly made of plastic.

[0012] Among them, the bracket is provided with a plurality of through holes, and the two reinforcing plates, the two insulating plates and the two insulating sheets are all provided with a plurality of screw through holes. The plurality of through holes, the screw through holes of the two reinforcing plates, the screw through holes of the two insulating plates and the screw through holes of the insulating sheets correspond one to one along the height direction of the battery module, and are used to lock the passage of the screws.

[0013] A second aspect of the present application provides an electrical device, which is electrically connected to the positive electrode connecting plate and the negative electrode connecting plate of the energy storage device.

[0014] In this embodiment, the manner in which the screw connects the insulating plate, the insulating sheet, the battery pack and the reinforcing plate inside the battery module, as well as the manner in which the positive electrode connecting sheet and the negative electrode connecting sheet are bent to lead out the bent portion, optimizes the integration of the battery module, not only reduces the weight of the energy storage device, but also ensures its structural strength and stability in use, so that the energy storage device can continue to work efficiently in a low-speed power environment, improves the cost-effectiveness of the entire electrical equipment, and expands the market for the electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solution of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be described below.

[0016] Figure 1 An exploded schematic diagram of an energy storage device provided in an embodiment of the present application;

[0017] Figure 2 for Figure 1 A schematic diagram of the structure of a battery module of the energy storage device shown;

[0018] Figure 3 for Figure 2 A schematic structural diagram of the battery module from another angle;

[0019] Figure 4 for Figure 2 An exploded schematic diagram of the battery module shown;

[0020] Figure 5 for Figure 4 A schematic diagram of a part of the structure of the battery module shown;

[0021] Figure 6 for Figure 5 A schematic structural diagram of a partial structure of the battery module from another angle;

[0022] Figure 7 for Figure 5 A schematic diagram of the structure of the positive electrode connecting piece and the negative electrode connecting piece of the battery module shown;

[0023] Figure 8 for Figure 2 A schematic structural diagram of a first reinforcing plate of the battery module shown;

[0024] Fig. 9 for Figure 2 A schematic structural diagram of a second reinforcing plate of the battery module shown;

[0025] Fig.10 for Figure 2 An exploded schematic diagram of a partial structure of the battery module shown;

[0026] Fig.11 for Figure 2 A schematic cross-sectional view of the battery module shown;

[0027] Fig.12 for Fig.11 A schematic cross-sectional view of the XI region of the battery module shown. DETAILED DESCRIPTION

[0028] The specific implementation methods in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects rather than to describe a specific order. Reference to "embodiment" or "implementation method" in this article means that the specific features, structures or characteristics described in conjunction with the embodiment or implementation method may be included in at least one embodiment of the present application. The appearance of this phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0030] See also Figure 1 , Figure 1 A schematic diagram of an exploded view of an energy storage device provided in an embodiment of the present application.

[0031] The present application provides an energy storage device 1000, which is used to supply power to an electrical device (not shown). The energy storage device 1000 may be a battery or other component with a power storage function. Among them, the electrical device may be a vehicle or a drone, etc. Vehicles include but are not limited to pure electric vehicles, hybrid vehicles, extended-range electric vehicles, plug-in hybrid vehicles, or other new energy vehicles such as fuel cell electric vehicles. In this embodiment, the electrical device is described by taking a car as an example, and the energy storage device 1000 is described by taking a battery module 100 as an example. The car includes an energy storage device 1000, a controller, and a motor. The energy storage device 1000 is used to supply power to the controller and the motor as the operating power supply and driving power supply of the car. For example, the energy storage device 1000 is used for the working power demand of the electrical device during startup, navigation, and operation; for example, the energy storage device 1000 supplies power to the control system, and the control system controls the energy storage device 1000 to supply power to the motor in the electrical device, and the motor receives and uses the power of the energy storage device 1000 as the driving power supply of the electrical device.

[0032] The number of energy storage devices 1000 may be one or more, and the energy storage devices 1000 may be connected in series or in parallel to each other to supply power to electrical equipment. In this embodiment, "several" or "plurality" refers to two or more. It is understandable that the energy storage device 1000 may include but is not limited to a battery module, a battery pack, a battery system, etc. The actual application form of the energy storage device 1000 may be, but is not limited to, the listed products, and may also be other application forms.

[0033] For ease of description, in this application, the length direction of the energy storage device 1000 is defined as the X-axis direction, the width direction is defined as the Y-axis direction, and the height direction is defined as the Z-axis direction. The X-axis, Y-axis, and Z-axis directions are perpendicular to each other. It should be noted that the length direction of the battery module 100 is consistent with the length direction of the energy storage device 1000, the width direction of the battery module 100 is consistent with the width direction of the energy storage device 1000, and the height direction of the battery module 100 is consistent with the height direction of the energy storage device 1000. It should be noted that the directional terms such as "rear", "front", "upper", "lower", "top" and "bottom" mentioned in the description of the embodiments of the present application are based on the instructions in the attached manual. Figure 1 The description of the directions shown uses the positive direction of the Z axis as "up" and "top", the positive direction of the Y axis as "front", and the positive direction of the X axis as "left", which does not constitute a limitation on the actual application scenario of the energy storage device 1000.

[0034] The energy storage device 1000 includes a battery module 100 and a box 300. The battery module 100 includes a bracket 10, an electrical connector (not shown), a plurality of battery packs 1, a reinforcing plate 40, an insulating plate 50, an insulating sheet 60, a circuit board 70, and a circuit board adapter 80. The circuit board 70 and the circuit board adapter 80 are both provided with screw holes (not shown) for passing screws 33 and rivet threaded columns 34. The box 300 includes a cover 310 and a body 320. The body 320 includes a bottom plate 321 and a side plate 322. The side plate 322 surrounds the periphery of the bottom plate 321 and is arranged with the bottom plate 321 to form a receiving cavity 324. The side plate 322 is arranged to form an opening 323 on one side away from the bottom plate 321, and the opening 323 is connected to the receiving cavity 324 and is arranged opposite to the bottom plate 321. The battery module 100 is accommodated in the receiving cavity 324 and is fixedly connected to the bottom plate 321. The cover 310 is sealed at the opening 323 , thereby sealing the battery module 100 in the box 300 , ensuring that the battery module 100 is protected from the external environment.

[0035] In this embodiment, the box body 300 adopts a plastic shell. Compared with the solution of using a metal shell commonly used in the market, the box body 300 in this embodiment reduces the weight of the energy storage device 1000.

[0036] See also Figure 2 , Figure 3 as well as Figure 4 , Figure 2 for Figure 1 The schematic diagram of the structure of the battery module of the energy storage device shown in FIG. Figure 3 for Figure 2 The schematic diagram of the structure of the battery module from another angle is shown. Figure 4 for Figure 2 Schematic diagram of the exploded battery module shown.

[0037] The bracket 10 passes through and fixes the opposite ends of several battery packs 1. The electrical connector (not shown) is connected to the side of the bracket 10 facing away from the battery pack 1. The electrical connector connects several battery packs 1, is used for series or parallel connection of several battery packs 1, and connects the energy storage device 1000 to the external circuit to power the electrical equipment (not shown). The circuit board adapter 80 is electrically connected to the circuit board 70 and the electrical connector, thereby realizing the electrical connection between the circuit board 70 and several battery packs 1. In the Z-axis direction, the reinforcing plate 40 includes a first reinforcing plate 41 and a second reinforcing plate 42. The first reinforcing plate 41 and the second reinforcing plate 42 fix the opposite ends of several battery packs 1. The insulating plate 50 includes a first insulating plate 51 and a second insulating plate 52. The first insulating plate 51 and the second insulating plate 52 are located at opposite ends of several battery packs 1, and are used to insulate the battery pack 1 and the reinforcing plate 40. The insulating sheet 60 includes a first insulating sheet 61 and a second insulating sheet 62. The first insulating sheet 61 and the second insulating sheet 62 are located at opposite ends of the first reinforcing plate 41. The insulating plate 50 and the insulating sheet 60 are used to insulate the battery packs 1 from the reinforcing plate 40 and the circuit board 70 to prevent the energy storage device 1000 from short circuiting. The battery module 100 also includes a plurality of fixing members 3. The fixing member 3 includes a plurality of screws 31, a plurality of nuts 32, a plurality of screws 33, and a plurality of rivet threaded columns 34. In the X-axis direction and the Y-axis direction, the battery module 100 is fixed by the plurality of fixing members 3.

[0038] See also Figure 5 and Figure 6 , Figure 5 for Figure 4 A schematic diagram of a partial structure of a battery module is shown. Figure 6 for Figure 5 A schematic structural diagram of a partial structure of a battery module shown from another angle.

[0039] The bracket 10 includes several hollow parts, several battery accommodating holes 13 and several through holes 14. The battery accommodating holes 13 and the through holes 14 are arranged in an array, and several battery accommodating holes 13 are arranged around the several through holes 14. The battery accommodating holes 13 are arranged around the hollow parts. The battery accommodating holes 13 are used to accommodate and position the single battery 2. The through holes 14 can be used to pass the screw 31, and can also be used to dissipate heat from the battery module 100. Each hollow part includes four holes. It should be noted that the four holes located in a hollow part do not accommodate and position the single battery 2. The holes constituting the hollow part of this embodiment have the same structure as the battery accommodating holes 13. It can be understood that some of the battery accommodating holes 13 do not accommodate and position the single battery 2 as the hollow part, which is also convenient for the manufacture of the bracket 10, that is, the battery accommodating holes 13 in the hollow part together form a matrix. The hollow part includes a first hollow part 11 and a second hollow part 12. The first hollow portion 11 and the second hollow portion 12 are spaced apart with respect to the bracket 10 through the battery accommodating hole 13 , and all battery packs 1 are arranged to avoid the first hollow portion 11 and the second hollow portion 12 .

[0040] The bracket 10 can be a plate-like structure made of materials such as metal or plastic. The battery accommodating hole 13 and the through hole 14 are both through holes, and the battery accommodating hole 13 and the through hole 14 pass through two opposite surfaces of the bracket 10. In this embodiment, the four battery accommodating holes 13 form a mounting hole group, and the four battery accommodating holes 13 surround a through hole 14, and there are at least two mounting hole groups between the first hollow portion 11 and the second hollow portion 12. The battery accommodating holes 13 are arranged in a matrix, and the mounting hole groups and the hollow portions are arranged in a matrix. In this embodiment, the bracket 10 adopts a plastic bracket, which reduces the weight of the battery module 100. At the same time, due to the low cost of plastic, the manufacturing cost of the energy storage device 1000 is reduced. In this embodiment, there are two brackets 10.

[0041] Each battery pack 1 includes four single cells 2, and the four single cells 2 are located at the same end of the battery pack 1 with the same polarity. The single cell includes a positive electrode 201 and a negative electrode 202. It can be explained that all the positive electrodes 201 of the four single cells 2 are located at the same end of the battery pack 1, and all the negative electrodes 202 of the four single cells 2 are located at the other end of the battery pack 1. Located on the same side of the battery module 100, the positive electrodes 201 of the battery pack 1 and the negative electrodes 202 of the battery pack 1 are alternately distributed, and the current flows from the negative electrode 202 of one battery pack 1 to the positive electrode 201 of another battery pack 1, and then to the negative electrode 202 of the third battery pack 1. The end of the battery packs 1 facing the cover is the top side A. The end facing away from the top side A is the bottom side B. Specifically, the end of a battery group 1 with all positive electrodes 201 facing the positive direction of the Z axis is named as the positive battery group 101, that is, the positive battery group 101 is a battery group 1 with all negative electrodes 202 facing the negative direction of the Z axis; the end of a battery group 1 with all positive electrodes 201 facing the negative direction of the Z axis is named as the negative battery group 102, that is, the negative battery group 102 is a battery group 1 with all negative electrodes 202 facing the positive direction of the Z axis.

[0042] The single cells 2 of each battery pack 1 are installed in a battery receiving hole 13 of a mounting hole group, located at the top side A and the bottom side B of the battery pack 1. The positive battery packs 101 and the negative battery packs 102 are arranged alternately. One positive battery pack 101 is connected to at least two negative battery packs 102, and one negative battery pack 102 is connected to at least two positive battery packs 101.

[0043] It should be noted that the single battery 2 includes but is not limited to cylindrical batteries, square batteries and chip-type batteries, etc. In this embodiment, the single battery 2 uses a high-rate cylindrical battery, which can increase the capacity of the energy storage device 1000 and increase its energy density, ensuring good compatibility.

[0044] The electrical connector includes a plurality of electrical connecting pieces 21, a positive connecting piece 22a and a negative connecting piece 22b of the same structure. In this embodiment, along the Z-axis direction, a plurality of electrical connecting pieces 21 are located on the top side A and the bottom side B of the battery pack 1, and one electrical connecting piece 21 is connected to two battery packs 1 so that the two battery packs 1 are connected in series. The positive connecting piece 22a and the negative connecting piece 22b are both located on the top side A of the battery pack 1. The positive connecting piece 22a and the negative connecting piece 22b are each connected to a battery pack 1. After the battery packs 1 connected in series by the plurality of electrical connecting pieces 21 are connected, the positive connecting piece 22a and the negative connecting piece 22b realize the outflow and inflow of current. That is, the positive connecting piece 22a is connected to a positive battery pack 101, and the negative connecting piece 22b is connected to a negative battery pack 102. It should be noted that the positive electrode connecting piece 22a and the negative electrode connecting piece 22b are the positive electrode and the negative electrode of the battery module 100, and are used to realize the electrical connection between the battery module 100 and external electrical equipment.

[0045] An electrical connection sheet 21 connects two battery packs 1 and is used to connect two adjacent battery packs 1 in series. It can be understood that each electrical connection sheet 21 located on the top side A only connects two battery packs 1, that is, one electrical connection sheet 21 connects one positive battery pack 101 and one negative battery pack 102. Each electrical connection sheet 21 located on the bottom side B only connects two battery packs 1. Exemplarily, a positive battery pack 101 located on the top side A and an adjacent negative battery pack 102 are connected to an electrical connection sheet 21, and another positive battery pack 101 adjacent to the negative battery pack 102 is connected to another adjacent negative battery pack 102 through another electrical connection sheet 21. A negative battery pack 102 and a positive battery pack 101 located on the bottom side B are connected to an electrical connection sheet 21.

[0046] It should be noted that an electrical connecting piece 21 on the bottom side B and an electrical connecting piece 21 on the top side A are connected in series through a negative battery group 102 or a positive battery group 101, that is, an electrical connecting piece 21 on the top side A and an electrical connecting piece 21 on the bottom side B are respectively connected to the positive and negative poles of the same battery group 1; that is, the electrical connecting piece 21 on the top side A and the electrical connecting piece 21 on the bottom side B jointly realize the series connection of several battery groups 1.

[0047] The number of the electrical connection pieces 21 is determined according to the number of battery packs 1. In this embodiment, the number of the electrical connection pieces 21 is fifteen, that is, seven electrical connection pieces 21 are arranged on the top side A of the battery pack 1, and eight electrical connection pieces 21 are arranged on the bottom side B of the battery pack 1, so as to realize current conduction of the battery pack 1.

[0048] See also Figure 7 , Figure 7 for Figure 5 A schematic diagram of the structure of the positive electrode connecting piece and the negative electrode connecting piece of the battery module shown.

[0049] The positive electrode connecting piece 22a and the negative electrode connecting piece 22b include a bent portion 221 and a base portion 222. The bent portion 221 is located on one side of the base portion 222 and is connected to the base portion 222 at an angle. It should be noted that as long as the bent portion 221 can be led out, this embodiment does not specifically limit this angle. The bent portion 221 protrudes from the top side A and can extend to form a first reinforcing plate 41 at the top, which is used to be electrically connected to external electrical equipment.

[0050] The base portion 222 is used to be electrically connected to a positive battery pack 101 or a negative battery pack 102 , and then the energy storage device 1000 is electrically connected to an external electrical device through the bent portion 221 , thereby supplying power to the electrical device.

[0051] Please refer to Figure 8 and Fig. 9 , Figure 8 for Figure 2 The schematic diagram of the structure of the first reinforcing plate of the battery module shown, Fig. 9 for Figure 2 A schematic structural diagram of the second reinforcement plate of the battery module shown.

[0052] The first reinforcing plate 41 includes a first substrate 417 and a plurality of positioning edges. The first substrate 417 includes a first surface 4171 and a second surface 4172. Along the thickness direction of the first substrate 417, the first surface 4171 and the second surface 4172 are arranged in opposite directions. In this embodiment, the first substrate 417 is generally a T-shaped thin plate, and a third avoidance opening 411 and a fourth avoidance opening 412 are arranged on one side of the first substrate 417. The third avoidance opening 411 and the fourth avoidance opening 412 are arranged at intervals.

[0053] In this embodiment, the positioning edges are formed by bending the side edge of the first substrate 417 toward the first surface 4171 for multiple times, and the positioning edges protrude from the first surface 4171. Several positioning edges have surfaces parallel to the first surface 4171.

[0054] For ease of description, the plurality of positioning edge clamps are respectively the first edge clamp 413, the second edge clamp 414, the third edge clamp 415 and the fourth edge clamp 416. Along the periphery of the first substrate 417, the first edge clamp 413, the second edge clamp 414, the third edge clamp 415 and the fourth edge clamp 416 are arranged at intervals. Along the X-axis direction, the first edge clamp 413 and the fourth edge clamp 416 are located at opposite sides of the first substrate 417, and the extension directions are parallel to each other. Among them, the first edge clamp 413 is located between the third avoidance opening 411 and the fourth avoidance opening 412. Along the Y-axis direction, the second edge clamp 414 and the third edge clamp 415 are located at opposite ends of the first substrate 417, and the extension directions are parallel to each other.

[0055] In this embodiment, the first reinforcing plate 41 is made of a metal plate. Without increasing the thickness of the first reinforcing plate 41, the periphery of the first reinforcing plate 41 is designed with a folded edge and thickened edge, thereby enhancing the edge structural strength of the first reinforcing plate 41 and not increasing the weight of the energy storage device 1000, thereby ensuring the structural stability and strength of the energy storage device 1000 and enabling the energy storage device 1000 to continuously and efficiently work in a low-speed power environment.

[0056] Along the thickness direction of the first substrate 417, the first substrate 417 is further provided with a plurality of second screw through holes 4174 and a plurality of third screw through holes 4173, and the second screw through holes 4174 and the plurality of third screw through holes 4173 both penetrate the first surface 4171 and the second surface 4172. The second screw through holes 4174 are used to pass through the screw 31. The third screw through holes 4173 are used to pass through the rivet threaded column 34. The number of the second screw through holes 4174 and the third screw through holes 4173 respectively corresponds to the number of the screw 31 and the rivet threaded column 34 in the battery module 100.

[0057] The second reinforcing plate 42 includes a second substrate 421, a plurality of bending portions and a plurality of positioning pressing edges. The second substrate 421 includes a third surface 4211 and a fourth surface 4212. Along the thickness direction of the second reinforcing plate 42, the third surface 4211 and the fourth surface 4212 are arranged in opposite directions. In this embodiment, the second substrate 421 is a generally rectangular thin plate, and a plurality of bending portions 422 with the same structure are arranged on both sides of the second substrate 421, and a plurality of positioning pressing edges are arranged on the other two sides of the second substrate 421.

[0058] In this embodiment, the bending portion 422 is formed by bending the opposite two sides of the second substrate 421 toward the fourth surface 4212 multiple times, and the bending portion 422 protrudes from the fourth surface 4212. Several bending portions 422 have surfaces parallel to the fourth surface 4212. In this embodiment, the number of the bending portions 422 is two. Along the length direction of the second reinforcing plate 42, the two bending portions 422 are arranged in parallel and spaced apart. The extension direction of the two bending portions 422 is consistent with the length direction of the second reinforcing plate 42. The bending portion 422 includes a first bending edge 4221 and a second bending edge 4222. The extension directions of the first bending edge 4221 and the second bending edge 4222 are both consistent with the extension direction of the bending portion 422. The first bending edge 4221 is connected to the second substrate 421 and forms a certain angle with its fourth surface 4212. The first bending edge 4221 and the second bending edge 4222 are connected and have a certain angle. The second bending edge 4222 is arranged parallel to the fourth surface 4212. The second bending edge 4222 is fixedly connected to the bottom plate 321 of the box body 300. The angles of the first bending edge 4221 and the second bending edge 4222 and the angle of the second substrate 421 of the first bending edge 4221 are not specifically limited in this embodiment.

[0059] In this embodiment, the positioning edges are formed by bending the other two opposite sides of the second substrate 421 toward the fourth surface 4212 multiple times, and the positioning edges protrude from the fourth surface 4212. Several positioning edges have surfaces parallel to the fourth surface 4212.

[0060] For ease of description, several positioning edge clamps are respectively the fifth edge clamp 423 and the sixth edge clamp 424. Along the periphery of the second substrate 421, the fifth edge clamp 423 and the sixth edge clamp 424 are arranged in parallel and spaced apart. Among them, a bending portion 422 is connected between the third avoidance opening 411 and the fourth avoidance opening 412. Along the Y-axis direction, the fifth edge clamp 423 and the sixth edge clamp 424 are located on opposite sides of the second substrate 421, and the extension directions are parallel to each other. It should be noted that the extension directions of the fifth edge clamp 423 and the sixth edge clamp 424 are both perpendicular to the extension direction of the bending portion 422.

[0061] In this embodiment, the second reinforcing plate 42 is made of a metal plate. Without increasing the thickness of the second reinforcing plate 42, the periphery of the second reinforcing plate 42 is designed to be thickened by folding, thereby enhancing the structural strength of the second reinforcing plate 42 and not increasing the weight of the energy storage device 1000, thereby ensuring the structural stability and strength of the energy storage device 1000, and enabling the energy storage device 1000 to work continuously and efficiently in a low-speed power environment.

[0062] Along the thickness direction of the second substrate 421 , the second substrate 421 is further provided with a plurality of sixth screw holes 4213 . Along the thickness direction of the second substrate 421 , the sixth screw holes 4213 penetrate the third surface 4211 and the fourth surface 4212 for passing a plurality of screws 31 .

[0063] See also Fig.10 , Fig.10 for Figure 2 Schematic diagram of partial structure of the battery module shown.

[0064] The first insulating plate 51 is a generally rectangular thin plate, which includes two opposite surfaces, and also includes a first limiting hole 511, a second limiting hole 512 and a plurality of third screw through holes 513. Along the thickness direction of the first insulating plate 51, the first limiting hole 511, the second limiting hole 512 and the third screw through holes 513 all penetrate the two surfaces of the first insulating plate 51. Along the width direction of the first insulating plate 51, the first limiting hole 511 and the second limiting hole 512 are arranged in parallel and spaced apart, and are used to pass through the bent portion 221 of the positive electrode connecting piece 22a and the negative electrode connecting piece 22b. The third screw through holes 513 correspond to the screw 31 one by one, and are used for the screw 31 to pass through.

[0065] The second insulating plate 52 is a generally rectangular thin plate, which includes two opposite surfaces and a plurality of fifth screw holes 521. The fifth screw holes 521 penetrate the two surfaces of the second insulating plate 52 along the thickness direction of the second insulating plate 52 for the screws 31 to pass through.

[0066] The first insulating sheet 61 is a generally T-shaped thin plate, which includes two opposite surfaces, and also includes a first avoidance opening 611 and a second avoidance opening 612. Along the thickness direction of the first insulating sheet 61, the first avoidance opening 611 and the second avoidance opening 612 penetrate the two surfaces and penetrate one side of the first insulating sheet 61. Along the length direction of the first insulating sheet 61, the first avoidance opening 611 and the second avoidance opening 612 are arranged in parallel and spaced apart, and are located on the same side of the first insulating sheet 61. The first avoidance opening 611 and the second avoidance opening 612 are used to avoid the positive electrode connecting sheet 22a and the negative electrode connecting sheet 22b, respectively.

[0067] The first insulating sheet 61 is also provided with a plurality of first screw through holes 613 and a plurality of second screw through holes 614. Along the thickness direction of the first insulating sheet 61, the first screw through holes 613 and the second screw through holes 614 both penetrate the two surfaces of the first insulating sheet 61. The first screw through holes 613 are used to pass through a plurality of screws 31. The second screw through holes 614 are used to pass through a plurality of rivet threaded columns 34. The number of the first screw through holes 613 corresponds one-to-one to the number of the screws 31, and the number of the second screw through holes 614 corresponds one-to-one to the number of the rivet threaded columns 34. It should be noted that the first insulating sheet 61 is connected between the circuit board adapter sheet 80 and the first reinforcing plate 41, and is used to insulate the first reinforcing plate 41 and the circuit board adapter sheet 80.

[0068] The second insulating sheet 62 is a roughly rectangular thin plate, which includes two opposite surfaces, and also includes a fifth avoidance opening 621 and a sixth avoidance opening 622. Along the thickness direction of the second insulating sheet 62, the fifth avoidance opening 621 and the sixth avoidance opening 622 penetrate the two surfaces and penetrate one side of the second insulating sheet 62. Along the length direction of the second insulating sheet 62, the fifth avoidance opening 621 and the sixth avoidance opening 622 are arranged in parallel and spaced apart, and are located on the same side of the second insulating sheet 62, respectively, for completely avoiding the positive electrode connecting sheet 22a and the negative electrode connecting sheet 22b, and for passing the screw 31. The second insulating sheet 62 is also provided with a plurality of fourth screw through holes 623. Along the thickness direction of the second insulating sheet 62, the fourth screw through holes 623 penetrate the two surfaces of the second insulating sheet 62, and are used to pass a plurality of screws 31.

[0069] Please refer to Figure 4 , Figure 5 and Fig.10Along the height direction of the battery module 100, the circuit board 70, the circuit board adapter sheet 80, the first insulating sheet 61, the first reinforcing plate 41, the first insulating plate 51 and the second insulating sheet 62 are stacked in sequence on the top side A of the plurality of battery packs 1, and the second insulating plate 52 and the second reinforcing plate 42 are stacked in sequence on the bottom side B of the plurality of battery packs 1.

[0070] Specifically, the single cells 2 of several battery packs 1 are all accommodated in the battery accommodating holes 13 of the bracket 10. The two brackets 10 are located at both ends of the length direction of the single cell 2 to prevent the single cell 2 from moving, and then limit and fix the top side A and the bottom side B of the battery pack 1, so that the battery module 100 is not easy to shake, ensuring the safety and structural stability of the energy storage device 1000, avoiding shaking during operation, and thus preventing safety accidents. In addition, the battery pack 1 uses high-rate cylindrical cells, which are installed in the plastic bracket 10. In the volume with high energy density, the bracket 10 adopts an arrangement method with the middle of both ends hollowed out, which not only ensures the current balance and consistency of the single cell 2, but also makes the force of the entire battery module 100 balanced.

[0071] It should be noted that along the height direction of the battery module 100, the battery accommodating holes 13 and the through holes 14 of the two brackets 10 correspond one to one. The battery accommodating holes 13 and the through holes 14 of the two brackets 10 are arranged in an array, which is conducive to optimizing the integration of the battery module 100 and improving the energy density of the energy storage device 1000. Several through holes 14 can pass through the screw 31. At the same time, the through holes 14 are arranged between the battery accommodating holes 13 at intervals to dissipate heat for the single battery 2. During the charging and discharging process of the energy storage device 1000, safety accidents such as explosion of the energy storage device 1000 due to excessive temperature can be avoided. The first hollow parts 11 of the two brackets 10 are coaxially arranged, and the second hollow parts 12 of the two brackets 10 are coaxially arranged. All battery packs 1 are arranged to avoid the first hollow part 11 and the second hollow part 12, thereby ensuring that the current of the battery packs 1 outside the hollow part is balanced and consistent, and the force of the entire battery module 100 is balanced.

[0072] The electrical connector is connected to both ends of several battery packs 1, that is, it is arranged on the top side A and the bottom side B of the bracket 10 facing away from the battery pack 1. The top side A of the battery pack 1 is connected with the electrical connection piece 21, the positive electrode connection piece 22a and the negative electrode connection piece 22b. The bottom side B of the battery pack 1 is only connected with the electrical connection piece 21. It should be noted that the specific connection position of the positive electrode connection piece 22a and the negative electrode connection piece 22b is not strictly limited in this embodiment. The total positive electrode of the battery module 100 is led out from the bent portion 221 of the positive electrode connection piece. The total negative electrode of the battery module 100 is led out from the bent portion 221 of the negative electrode connection piece 22b.

[0073] The first insulating sheet 61, the first reinforcing plate 41, the first insulating plate 51, and the second insulating sheet 62 are sequentially mounted on one side of the top side A of the battery pack 1. Specifically, the first insulating sheet 61 is connected between the circuit board adapter sheet 80 and the first reinforcing plate 41, and is used to insulate the circuit board adapter sheet 80 and the first reinforcing plate 41. The side surface of the first insulating sheet 61 facing away from the circuit board adapter sheet 80 and the first surface 4171 of the first reinforcing plate 41 abut against each other. The periphery of the first insulating sheet 61 is opposite to and abuts against several positioning edges of the first reinforcing plate 41. Several positioning edges of the first reinforcing plate 41 surround the periphery of the first insulating sheet 61. That is, the inner sides of the first edge 413, the second edge 414, the third edge 415 and the fourth edge 416 abut against the side edge of the first insulating sheet 61. The second surface 4172 of the first reinforcing plate 41 abuts against one side surface of the first insulating plate 51. One side surface of the first insulating plate 51 facing away from the second surface 4172 abuts against one side surface of the second insulating sheet 62. One side surface of the second insulating sheet 62 facing away from the second surface 4172 abuts against the electrical connector, that is, the second insulating sheet 62 is connected between the first insulating plate 51 and the electrical connector, increasing the insulation thickness between the electrical connector and the first insulating plate 51.

[0074] It should be noted that, along the Z-axis direction, the first avoidance opening 611 of the first insulating sheet 61, the third avoidance opening 411 of the first reinforcing plate 41, and the fifth avoidance opening 621 of the second insulating sheet 62 correspond one to one. The second avoidance opening 612 of the first insulating sheet 61, the fourth avoidance opening 412 of the first reinforcing plate 41, and the sixth avoidance opening 622 of the second insulating sheet 62 correspond one to one. The first screw through hole 613, the second screw through hole 4174, the third screw through hole 513, and the fourth screw through hole 623 correspond one to one. The second insulating plate 52 and the second reinforcing plate 42 are sequentially mounted on one side of the bottom side B of the battery pack 1. Specifically, the second insulating plate 52 is arranged between several battery packs 1 and the second reinforcing plate 42, and is used to insulate the second reinforcing plate 42 from the battery pack 1. The side surface of the second insulating plate 52 facing away from the battery pack 1 abuts against the third surface 4211 of the second reinforcing plate 42. The second reinforcing plate 42 is disposed between the second insulating plate 52 and the bottom plate 321 of the box body 300. The fourth surface 4212 of the second reinforcing plate 42 is spaced apart from the bottom plate 321 of the box body 300. The bent portion 422 of the second reinforcing plate 42 is fixedly connected to the bottom plate 321, thereby fixing the battery module 100 in the box body 300.

[0075] It should be noted that the fifth screw through hole 521 of the second insulating plate 52 and the sixth screw through hole 4213 of the second reinforcing plate 42 correspond to each other. In this embodiment, in the Z-axis direction, the first reinforcing plate 41 and the second reinforcing plate 42 are used to constrain the plurality of battery packs 1, thereby increasing the restraining force on the battery packs 1. Since the reinforcing plate 40 made of metal has high strength, the structural strength of the battery module 100 is increased, and the structural stability of the energy storage device 1000 is ensured, so that it can continue to work efficiently in a low-speed power environment.

[0076] In this embodiment, along the Z-axis direction, the first screw through hole 613, the second screw through hole 4174, the third screw through hole 513, the fourth screw through hole 623, the partial through hole 14, the fifth screw through hole 521 and the sixth screw through hole 4213 are coaxially arranged for passing several screws 31. Several screws 31 pass through the first screw hole 613, the second screw hole 4174, the third screw hole 513, the fourth screw hole 623, the partial through hole 14, the fifth screw hole 521 and the sixth screw hole 4213 in sequence, and through the corresponding cooperation of several nuts 32 on the side of the fourth surface 4212 of the second reinforcing plate 42, the first insulating sheet 61, the first reinforcing plate 41, the first insulating plate 51, the second insulating plate 62, the bracket 10, the several battery packs 1, the second insulating plate 52 and the second reinforcing plate 42 are fixed in sequence, so as to realize the locking and fixing of the entire battery module 100, optimize the internal integration of the battery module 100, ensure the high-strength structure of the battery module 100, and realize that the energy storage device 1000 can work continuously and efficiently in a low-speed power environment. At the same time, the mechanical fixing method of the screw 31 is also convenient for the disassembly and maintenance of the energy storage device 1000 after sales.

[0077] It should be noted that the extension direction of the screw 31 is consistent with the height direction of the battery module 100. The number of screws 31 is several, and the number of nuts 32 is the same as the number of screws 31. In this embodiment, the number of screws 31 is seven, of which two screws 31 also pass through the two avoidance openings of the second insulating sheet 62 respectively. The number of nuts 32 is also seven, all of which abut against the fourth surface 4212 of the second reinforcing plate 42. In actual application scenarios, the number of screws 31 and nuts 32 can be selected according to needs.

[0078] Along the Z-axis direction, the screw hole (not shown), the second screw through hole 614 and the third screw through hole 4173 are coaxially arranged for passing the screw 33 and the rivet threaded column 34. Several screws 33 are matched with several rivet threaded columns 34, and pass through the screw hole (not shown), the second screw through hole 614 and the third screw through hole 4173 in sequence to fix the circuit board 70, the circuit board adapter 80 and the first insulating sheet 61 to the first reinforcing plate 41 in sequence. The circuit board adapter 80 fixes the circuit board 70, avoiding the safety risks brought by the bonding method of the circuit board 70 in the prior art. The circuit board 70 does not need to be punched, ensuring the use area and strength of the circuit board 70. The circuit board adapter 80 is fixed with the screw 33, eliminating the risk of short circuit caused by the circuit board 70 not being firmly fixed and shifting during the working vibration of the battery module 100. At the same time, the mechanical fixing method using screws 33 not only facilitates the disassembly and maintenance of the energy storage device 1000 after sales, but also realizes the electrical connection between the circuit board 70 and the inside of the battery module 100, thereby controlling the charge and discharge management of the energy storage device 1000, preventing the battery module 100 from overcharging and over-discharging, and extending the service life of the energy storage device 1000, thereby achieving a normal number of cycle charge and discharge.

[0079] It should be noted that the extending directions of the screws 33 and the rivet threaded columns 34 are consistent with the height direction of the battery module 100. The number of screws 33 is several, and the number of screws 33 is the same as the number of rivet threaded columns 34. In this embodiment, the number of screws 33 is four, and the number of rivet threaded columns 34 is also four. In actual application scenarios, the number of screws 33 and rivet threaded columns 34 can be selected according to needs.

[0080] See also Fig.11 as well as Fig.12 , Fig.11 for Figure 2 The schematic cross-sectional view of the battery module shown, Fig.12 for Fig.11 A schematic cross-sectional view of the XI region of the battery module shown.

[0081] Along the height direction of the battery module 100, the bent portion 221 of the positive electrode connecting piece 22a and the negative electrode connecting piece 22b passes through the second insulating sheet 62, the first insulating plate 51, the first reinforcing plate 41 and the first insulating sheet 61 in sequence. The bent portion 221 of the positive electrode connecting piece 22a passes through the fifth avoidance opening 621, the first limiting hole 511, the third avoidance opening 411 and the first avoidance opening 611 in sequence, and is electrically connected to the positive electrode of the external electrical equipment, which will not occupy the internal space of the battery module 100, and can also avoid the technical problem that the positive and negative electrodes cannot be led outward due to the limited space inside the battery module 100. It should be noted that the first avoidance opening 611, the third avoidance opening 411 and the fifth avoidance opening 621 are correspondingly arranged. The cross-sectional area of ​​the first avoidance opening 611 is greater than the cross-sectional area of ​​the third avoidance opening 411. The fifth avoidance opening 621 completely passes through the positive electrode connecting piece. It is understandable that the cross-sectional area of ​​the fifth avoidance opening 621 is greater than the cross-sectional area of ​​the positive electrode connecting piece 22a. The bent portion 221 of the negative electrode connecting piece 22b passes through the sixth avoidance opening 622, the second limiting hole 512, the fourth avoidance opening 412 and the second avoidance opening 612 in sequence, and is electrically connected to the negative electrode of the external electrical equipment, which will not occupy the internal space of the battery module 100, and can also avoid the technical problem that the space inside the battery module 100 is limited, resulting in the inability to lead out the positive and negative electrodes. It should be noted that the fourth avoidance opening 412, the second avoidance opening 612 and the sixth avoidance opening 622 are set accordingly. The cross-sectional area of ​​the fourth avoidance opening 412 is greater than the cross-sectional area of ​​the second avoidance opening 612. The sixth avoidance opening 622 completely passes through the negative electrode connecting piece 22b. The cross-sectional area of ​​the sixth avoidance opening 622 is greater than the cross-sectional area of ​​the negative electrode connecting piece 22b.

[0082] It should be noted that the bent portion 221 of the present embodiment is led out in such a way that it passes through the second insulating sheet 62, the first insulating plate 51, the first reinforcing plate 41 and the first insulating sheet 61 in sequence, so that the first insulating plate 51 can insulate the battery module 100 while pressing down. When the first insulating plate 51 is pressed down, the first insulating plate 51 can press the positive electrode connecting sheet 22a and the negative electrode connecting sheet 22b tightly, so that when the positive and negative electrode harnesses are locked, the connection between the single battery 2 and the positive electrode connecting sheet 22a and the negative electrode connecting sheet 22b is not subjected to stress pulling, thereby ensuring the stability of the electrical connection of the electrical connector.

[0083] It should be noted that along the height direction of the battery module 100, that is, the Z-axis direction, the thickness of the base portion 222 of the positive connecting plate 22a and the negative connecting plate 22b is just equal to the sum of the thicknesses of the second insulating plate 62 and the electrical connecting plate 21, which ensures that when the battery module 100 is vertically locked, the first insulating plate 51 is prevented from being easily deformed due to uneven thickness, so that the first insulating plate 51 and the first reinforcing plate 41 are balanced in force in the Z-axis direction, thereby avoiding the occurrence of safety accidents.

[0084] In this embodiment, the manner in which the screw 31 connects the insulating plate 50, the insulating sheet 60, the battery pack 1 and the reinforcing plate 40 inside the battery module 100, and the manner in which the positive electrode connecting sheet 22a and the negative electrode connecting sheet 22b are bent and led out of the bent portion 221, optimizes the integration of the battery module 100, which not only reduces the weight of the energy storage device 1000, but also ensures its structural strength and stability in use, so that the energy storage device 1000 can continue to work efficiently in a low-speed power environment, thereby improving the cost-effectiveness of the entire electrical equipment and expanding the market for electrical equipment.

[0085] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for general technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. An energy storage device, characterized in that; The energy storage device comprises a battery module and a box, wherein the battery module is assembled in the box; The battery module includes two brackets, a plurality of electrical connection sheets, a positive electrode connection sheet and a negative electrode connection sheet, a plurality of battery packs, two reinforcing plates, two insulating plates and insulating sheets, the plurality of battery packs having a top side and a bottom side arranged opposite to the top side, each bracket is provided with a plurality of battery accommodating holes arranged in a matrix and two hollow portions, along the thickness direction of the bracket, the plurality of battery accommodating holes and the two hollow portions all penetrate the bracket, and the two hollow portions are located between the plurality of battery accommodating holes and are arranged at intervals; Each battery pack includes a plurality of single cells, the single cells of the plurality of battery packs correspond to the plurality of battery accommodating holes one by one, and the single cells of the plurality of battery packs are arranged through and limited in the battery accommodating holes, the two brackets are respectively located on the top side and the bottom side, the plurality of battery packs are electrically connected through the plurality of electrical connecting sheets and are exposed from the brackets, the positive electrode connecting sheet and the negative electrode connecting sheet are both electrically connected to one of the battery packs, and the positive electrode connecting sheet and the negative electrode connecting sheet are the positive electrode and the negative electrode of the battery module, wherein the plurality of electrical connecting sheets are distributed on the top side and the bottom side; The two insulating plates are respectively stacked on the side of the two brackets facing away from the battery pack and abut against the electrical connection sheet, the two reinforcing plates are respectively stacked on the side of the two insulating plates facing away from the battery pack, the insulating sheet is stacked on both sides of the reinforcing plate located on the top side, and the two brackets, the two reinforcing plates, the two insulating plates and the insulating sheet are fixedly connected by screwing along the height direction of the battery module; Along the height direction of the battery module, the positive electrode connecting sheet and the negative electrode connecting sheet both pass through the reinforcing plate, the insulating plate and the insulating sheet located on the top side.

2. The energy storage device according to claim 1, characterized in that: The two reinforcing plates and the insulating sheet are further provided with two avoidance openings, the two insulating plates are provided with two limiting holes, the two avoidance openings of the reinforcing plates are arranged at intervals along the length direction of the battery module, the two limiting holes of the insulating plates are arranged at intervals along the length direction of the battery module, the two avoidance openings of the insulating sheet are arranged at intervals along the length direction of the battery module, and the avoidance openings of the two reinforcing plates and the insulating sheet and the limiting holes of the two insulating plates correspond one to one along the height direction of the battery module; The positive electrode connecting sheet and the negative electrode connecting sheet both include a bent portion and a base portion, the bent portion is located on one side of the base portion and is connected to the base portion at an angle, and the bent portions of the positive electrode connecting sheet and the negative electrode connecting sheet respectively extend through the avoidance openings and the two limiting holes of the two reinforcing plates and the insulating sheet.

3. The energy storage device according to claim 2, characterized in that: The insulating sheet includes a first insulating sheet and a second insulating sheet, wherein the first insulating sheet is stacked on a side of the reinforcing plate located on the top side facing away from the battery module, and the second insulating sheet is stacked between the insulating plate located on the top side and the bracket, and the second insulating sheet abuts against the electrical connection sheet. The thickness of the base portion of the positive electrode connecting sheet and the base portion of the negative electrode connecting sheet is equal to the sum of the thickness of the second insulating sheet and the electrical connecting sheet.

4. The energy storage device according to claim 1, characterized in that: The hollow portion includes a plurality of holes, and the plurality of holes and the plurality of hollow portions are arranged in a matrix. The hollow portion includes a first hollow portion and a second hollow portion, and the first hollow portion and the second hollow portion are arranged at intervals along the length direction of the energy storage device, and the first hollow portion and the second hollow portion are close to opposite ends of the bracket.

5. The energy storage device according to claim 3, characterized in that: The two reinforcement plates are both metal plates.

6. The energy storage device according to claim 5, characterized in that: The reinforcing plate includes a first reinforcing plate, and the first reinforcing plate includes a first substrate and several positioning edges, and the several positioning edges are respectively a first edge, a second edge, a third edge and a fourth edge. Along the periphery of the first substrate, the first edge, the second edge, the third edge and the fourth edge are arranged at intervals, the first edge and the fourth edge are located on opposite sides of the first substrate, and the first edge is located between the two avoidance openings of the first reinforcing plate; the second edge and the third edge are located at opposite ends of the first substrate, and the first edge, the second edge, the third edge and the fourth edge surround the first insulating sheet.

7. The energy storage device according to claim 3, characterized in that: The energy storage device also includes a circuit board and a circuit board adapter. The circuit board adapter is stacked on the side of the first insulating sheet facing away from the battery pack. The circuit board is installed on the side of the circuit board adapter facing away from the first insulating sheet. The circuit board adapter is fixedly connected to the first insulating sheet.

8. The energy storage device according to claim 1, characterized in that: The box body is mainly made of plastic.

9. The energy storage device according to any one of claims 1 to 8, characterized in that: The bracket is provided with a plurality of through holes, and the two reinforcing plates, the two insulating plates and the two insulating sheets are all provided with a plurality of screw through holes. The plurality of through holes, the screw through holes of the two reinforcing plates, the screw through holes of the two insulating plates and the screw through holes of the insulating sheets correspond one to one along the height direction of the battery module, and are used to lock the passage of the screws.

10. An electrical device, characterized in that: The energy storage device comprises the energy storage device as described in any one of claims 1 to 9, wherein the electrical equipment is electrically connected to the positive electrode connecting piece and the negative electrode connecting piece of the energy storage device.

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