Energy storage apparatus and electric device

Abstract

The present application relates to the technical field of energy storage, and discloses an energy storage apparatus and an electric device. The energy storage apparatus comprises: a plurality of battery modules, located in a battery compartment of a battery case; and sampling assemblies, each comprising an isolation plate that covers a plurality of battery cells of a corresponding battery module, and a circuit board that is connected to the battery cells of the corresponding battery module. Ends of circuit boards comprised in a first sampling assembly and second sampling assembly are respectively provided with a plug connector and a first receptacle, the first receptacle being fixed on the isolation plate of the second sampling assembly and mating with the plug connector.

Description

Energy storage device and electric equipment

[0001] Cross-reference to related applications

[0002] The present disclosure claims priority to Chinese Patent Application No. 202411126815.4, filed on August 16, 2024, entitled "Energy storage device and electric equipment", the entire contents of which are incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of energy storage, in particular to an energy storage device and an electric equipment. BACKGROUND

[0004] The existing battery pack currently includes a battery box and a battery module installed in the battery box. In the related art, the voltage and temperature of the multiple battery cells included in the battery module are transmitted to the battery management system (BMS) by a wiring collection method. Specifically, a wire harness is provided between the battery module and the battery management system, and the wire harness includes multiple connection lines. One end of the connection line is connected to the interface end of the BMS, and the other end is connected to the battery cell to collect the working condition parameters of the battery cell. However, in the trend of pursuing high energy density, the number of battery modules in the battery pack is increasing, and accordingly the number of battery cells is also increasing. Therefore, when the above wiring collection method is used, the number of connection lines will inevitably increase, which will cause the wire diameter of the wire harness to increase, resulting in excessive wiring occupying internal space and causing the utilization rate of the internal space of the battery pack to be low, increasing the manufacturing cost of the battery pack. Moreover, the large number of connection lines and the complex wire harness result in poor electrical safety. SUMMARY

[0005] One main purpose of the present application is to provide an energy storage device and an electric equipment.

[0006] To achieve the above purpose, the present application adopts the following technical solutions:

[0007] According to an aspect of the present application, there is provided an energy storage device, comprising: a battery box body comprising a lower box body and a box cover connected with the lower box body to enclose a battery compartment; a plurality of battery modules located in the battery compartment, each of the battery modules comprising a pair of end plates arranged oppositely, and a plurality of battery cells located between the pair of end plates, the plurality of battery modules comprising a first battery module and a second battery module adjacent in a length direction of the battery box body; a plurality of sampling assemblies corresponding to the plurality of battery modules one by one, and each of the sampling assemblies comprising an isolation plate covering the plurality of battery cells of the corresponding battery module, and a circuit board located on a side of the isolation plate away from the battery cells and connected with the plurality of battery cells of the corresponding battery module; wherein the plurality of sampling assemblies comprise a first sampling assembly and a second sampling assembly corresponding to the first battery module and the second battery module respectively, the circuit board of the first sampling assembly has a plug-in connector on an end portion close to the second sampling assembly, the circuit board of the second sampling assembly has a first plug-in seat on an end portion close to the first sampling assembly, the first plug-in seat is fixed on the isolation plate of the second sampling assembly, and the plug-in connector is plugged into the first plug-in seat.

[0008] In the present application, the sampling assembly comprises the circuit board, thereby avoiding the arrangement of a plurality of connection lines, simplifying the connection between the battery cells and the battery management system, and avoiding the complicated connection lines, thereby facilitating the improvement of the power utilization safety of the energy storage device. In addition, since the first plug-in seat is directly fixed on the isolation plate of the second sampling assembly, the fixing of the circuit board of the second sampling assembly is facilitated, and the integrated arrangement of the second sampling assembly is facilitated, thereby improving the assembly efficiency of the energy storage device.

[0009] According to an aspect of the present application, there is provided an electrical equipment comprising the energy storage device of the above aspect, wherein the energy storage device supplies power to the electrical equipment.

[0010] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and are not limiting to the present application. BRIEF DESCRIPTION OF DRAWINGS

[0011] The above features and advantages of the present application will become more apparent by describing in detail its example embodiments with reference to the attached drawings.

[0012] FIG. 1 is a schematic diagram of an energy storage system according to an example embodiment.

[0013] FIG. 2 is a schematic diagram of a structure of an energy storage device according to an example embodiment.

[0014] FIG. 3 is a schematic diagram showing a structure of connection of a battery module and a battery management system according to an exemplary embodiment.

[0015] FIG. 4 is a schematic diagram showing a partial enlarged structure of connection of the battery module and the battery management system shown in FIG. 3.

[0016] FIG. 5 is a schematic diagram showing an exploded structure of a sampling assembly according to an exemplary embodiment.

[0017] FIG. 6 is a schematic diagram showing an exploded structure of another sampling assembly according to an exemplary embodiment.

[0018] FIG. 7 is a schematic diagram showing a partial enlarged structure of the sampling assembly shown in FIG. 5.

[0019] FIG. 8 is a schematic diagram showing a structure of the sampling assembly shown in FIG. 6.

[0020] FIG. 9 is a schematic diagram showing a partial enlarged structure of an A region of the sampling assembly shown in FIG. 8.

[0021] FIG. 10 is a schematic diagram showing a partial enlarged structure of a B region of the sampling assembly shown in FIG. 8.

[0022] FIG. 11 is a schematic diagram showing a partial enlarged structure of the B region of yet another sampling assembly according to an exemplary embodiment.

[0023] FIG. 12 is a schematic diagram showing a partial enlarged structure of a C region of the sampling assembly shown in FIG. 8.

[0024] In the figure, the reference signs are explained as follows: 100, energy storage device; 200, electric energy conversion device; 300, user load; 10, battery box; 20, battery module; 30, sampling assembly; 40, battery management system; 50, wire harness; 11, lower box; 12, box cover; 21, end plate; 22, battery monomer; 23, cable tie; 24, first battery module; 25, second battery module; 211, mounting hole; 212, locking bolt; 213, locking cap; 214, second step surface; 31, isolation plate; 32, circuit board; 33, sampling terminal; 34, busbar; 35, first sampling assembly; 36, second sampling assembly; 311, first hot melt column; 312, first step surface; 313, second hot melt column; 314, first limiting groove; 315, avoidance groove; 321, first redundant section; 322, second redundant section; 323, limiting hole; 324, circuit collection plate; 325, circuit transmission plate; 3241, second plug-in seat; 3242, notch; 3243, second fixed plate; 3244, second plug-in base; 3251, third plug-in seat; 3252, third fixed plate; 3253, third plug-in base; 3254, third redundant section; 351, plug; 352, buffer pad; 361, first plug-in seat; 362, first fixed plate; 363, first plug-in base; 364, fixed hole. DETAILED DESCRIPTION

[0025] Example embodiments now will be described more fully hereinafter with reference to the accompanying drawings. Example embodiments, however, can be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the scope of example embodiments to those skilled in the art. Like reference numerals refer to like elements throughout the figures, and thus description of the same will be simplified or omitted.

[0026] Since the energy required by people has strong time and space, in order to reasonably use energy and improve utilization, it is necessary to store one energy form into the same energy form or convert into another energy form through a medium or device, and then release it in a specific energy form based on future application.

[0027] At present, green energy mainly includes light energy, wind energy, etc., and light energy and wind energy have the problems of strong intermittency and large fluctuation, which will cause the voltage instability of green power grid (not enough electricity at peak electricity consumption, and too much electricity at low electricity consumption), and the unstable voltage will cause damage to electricity, Therefore, due to insufficient electricity demand or insufficient grid accommodation capacity, the "abandonment of wind and light" problem may occur.

[0028] And to solve the problem of insufficient power demand or insufficient grid accommodation, it must rely on energy storage devices. That is, through energy storage devices, the electrical energy is converted into other forms of energy through physical or chemical means for storage, and when needed, the energy stored in the energy storage device is converted into electrical energy and released. Simply put, the energy storage device is similar to a large "power bank". When the light energy and wind energy are sufficient, the electrical energy is stored, and when needed, the stored electrical energy is released.

[0029] The current energy storage (i.e. energy storage) application scenarios are relatively wide, including power generation side energy storage, grid side energy storage, renewable energy grid connected energy storage, and user side energy storage, etc. The corresponding types of energy storage devices include:

[0030] (1) Large energy storage containers applied in grid side energy storage scenarios, which can be used as high-quality active and reactive power regulation power sources in the power grid, realize load matching of electrical energy in time and space, enhance renewable energy consumption capacity, and are of great significance in power grid system backup, relieving peak load power supply pressure and peak regulation;

[0031] (2) Small and medium-sized energy storage cabinets applied in industrial and commercial energy storage scenarios (banks, shopping malls, etc.) on the user side and small household energy storage boxes applied in household energy storage scenarios on the user side, the main operation mode is "peak clipping and valley filling". Because there is a big price difference in electricity bills according to the power demand at peak and valley positions, after users have energy storage equipment, in order to reduce costs, they usually charge the energy storage device (energy storage cabinet / box) during the low electricity price period; In the high electricity price period, the electricity in the energy storage device is released for use, in order to achieve the purpose of saving electricity bills. In addition, in remote areas, as well as areas with high incidence of natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices is equivalent to the user providing a backup power source for himself and the power grid, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0032] The present application provides an energy storage system, which comprises an energy storage device, so as to realize the storage or supply of electrical energy through the energy storage device.

[0033] Taking an outdoor energy storage scenario in a grid-side energy storage as an example, FIG. 1 illustrates a schematic diagram of an energy storage system provided by an embodiment of the present application, as shown in FIG. 1, the energy storage system includes an energy storage device 100, an electric energy conversion device 200, and a user load 300, the electric energy conversion device 200 (including a solar energy conversion device, a wind energy conversion device) is electrically connected with the energy storage device 100, and the energy storage device 100 is electrically connected with the user load 300. In this way, the solar energy, wind energy and other forms of energy can be converted into electric energy by the electric energy conversion device 200, and stored by the energy storage device 100, and then supplied to the user load 300 for use by the energy storage device 100 at the peak of electricity price, or supplied to the user load 300 for use by the energy storage device 100 when the power grid is disconnected / power off.

[0034] The energy storage device 100 can be a battery module 20 composed of a battery cell 22, a battery pack, a battery box, a battery system, etc. The battery cell 22 can be a lithium ion battery, a lithium-sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, etc., and can be in the form of a cylinder, a flat body, a cuboid, etc., which is not limited in the embodiments of the present application. Specifically, the battery cell 22 can realize the charging and discharging process by using the chemical reaction or change of the energy storage medium (chemical element). Simply put, the electric energy generated by light energy and wind energy is stored in the battery cell 22 through the chemical reaction or change of the energy storage medium, and the electric energy stored in the battery cell 22 is released and used through the chemical reaction or change of the energy storage medium when the use of external electric energy reaches the peak, or is transferred and used.

[0035] In some embodiments, as shown in FIG. 2, the energy storage device 100 includes a battery box 10, a plurality of battery modules 20, and a plurality of sampling assemblies 30. The battery box 10 includes a lower box body 11 and a box cover 12, and the box cover 12 is fixedly connected with the lower box body 11 to enclose a battery compartment. The plurality of battery modules 20 are located in the battery compartment, and the plurality of sampling assemblies 30 correspond one-to-one to the plurality of battery modules 20, and each sampling assembly 30 is located at the top of the corresponding battery module 20.

[0036] The battery modules 20 accommodated in the battery compartment of the battery box 10 can be 4, 6, 8, etc., and the more the number of battery modules 20, the higher the capacity of the energy storage device 100, thereby more easily meeting the market demand. For example, the battery compartment of the battery box 10 accommodates 2 rows of battery modules 20 along the length direction X of the battery box 10, and 4 columns of battery modules 20 along the width direction Y of the battery box 10, i.e. 8 battery modules 20 are accommodated in the battery compartment.

[0037] As shown in FIG. 3, the battery module 20 includes a pair of end plates 21 arranged oppositely, and a plurality of battery cells 22 located between the pair of end plates 21, and the plurality of battery cells 22 and the pair of end plates 21 can be fixed by a binding tool such as a cable tie 23. In addition, as shown in FIG. 3 and FIG. 4, the end plate 21 has a mounting hole 211 penetrating in the height direction of the battery box 10, and the battery module 20 includes a locking bolt 212 having a locking cap 213, the locking bolt 212 penetrates the mounting hole 211 and is fixedly connected with the bottom of the lower box 11, and the locking cap 213 abuts against the hole opening end surface of the mounting hole 211 to achieve the fixation of the battery module 20 in the battery compartment.

[0038] The end plate 21 can be a metal structure such as an aluminum metal plate, or an insulating structure such as a thermoplastic plastic. When the end plate 21 is a metal structure, an insulating base is fixed on the end plate 21, and the output pole connecting piece connected with the battery cell 22 is limited on the insulating base to ensure the creepage distance between the output pole connecting piece and the end plate 21 and the locking cap 213, and avoid the conduction between the output pole connecting piece and the end plate 21 and the locking bolt 212. When the end plate 21 is an insulating structure, the output pole connecting piece connected with the battery cell 22 is directly supported on the end surface of the end plate 21, and as shown in FIG. 4, the end plate 21 has a second stepped surface 214 facing away from the bottom of the lower box 11, and the mounting hole 211 penetrates the end plate 21 on the second stepped surface 214, and at this time the locking cap 213 of the locking bolt 212 abuts against the second stepped surface 214; in this way, the creepage distance between the output pole connecting piece and the locking cap 213 of the locking bolt 212 in the height direction of the battery box 10 can be pulled away, and the conduction between the output pole connecting piece and the locking bolt 212 can be avoided.

[0039] Compared with the case that the end plate 21 is a metal structure as described above, the end plate 21 is provided as an insulating structure, which can reduce the setting of the insulating base on the end plate 21, simplify the structure of the battery module 20, and improve the assembly efficiency of the battery module 20. In addition, the distance between the second stepped surface 214 and the end surface of the end plate 21 facing away from the bottom of the lower box 11 is greater than the thickness of the locking cap 213, so as to ensure that the locking cap 213 of the locking bolt 212 does not protrude from the end surface of the end plate 21 facing away from the bottom of the lower box 11.

[0040] As shown in FIG. 5 or FIG. 6, the sampling assembly 30 includes an isolation plate 31 and a circuit board 32, the isolation plate 31 covers a plurality of battery cells 22 corresponding to the battery module 20, and the circuit board 32 is located on the side of the isolation plate 31 away from the battery cells 22 and is connected with the plurality of battery cells 22 corresponding to the battery module 20.

[0041] As shown in FIG. 4, the sampling assembly 30 includes a circuit board 32 connected with the battery management system 40, so that the circuit board 32 is provided to avoid the arrangement of multiple connecting lines, thereby simplifying the connection between the battery monomer 22 and the battery management system 40, avoiding the complicated connection lines, and facilitating the electrical safety of the energy storage device 100.

[0042] The circuit board 32 is a flexible thin plate with metal traces, and includes two layers of insulating films and metal traces arranged between the two layers of insulating films. For example, the circuit board 32 can be a FPC (Flexible Printed Circuit) or a FFC (Flexible Flat Cable) or the like. In addition, the circuit board 32 is provided with a positioning hole, so that when the metal traces of the circuit board 32 are manufactured, the insulating film of the circuit board 32 can be fixed through the positioning hole, thereby ensuring the manufacturing yield of the metal traces.

[0043] The isolation plate 31 can be a plate-shaped structure made of insulating materials such as plastic plates, and the circuit board 32 is limited on the isolation plate 31 to avoid the shaking of the circuit board 32 during the transportation of the sampling assembly 30. Specifically, the circuit board 32 can be directly limited on the isolation plate 31, or can be pre-positioned on the isolation plate 31 and then limited on the isolation plate 31 to improve the assembly efficiency of the circuit board 32 on the isolation plate 31.

[0044] Alternatively, as shown in FIGS. 5 and 7, or FIGS. 8 and 9, the circuit board 32 has a limiting hole 323, and the isolation plate 31 is provided with a second hot melt column 313, the end of the second hot melt column 313 has a second cap (not shown in the figure), the limiting hole 323 is sleeved on the second hot melt column 313, and the second cap is located on the side of the circuit board 32 away from the isolation plate 31.

[0045] In this way, after the circuit board 32 is sleeved on the second hot melt column 313 of the isolation plate 31 based on the limiting hole 323, the direct limiting of the circuit board 32 on the isolation plate 31 can be realized based on the hot melt process. In addition, the circuit board 32 is usually provided with multiple limiting holes 323, and the isolation plate 31 is provided with a plurality of second hot melt columns 313 corresponding thereto, and at this time, the multiple second hot melt columns 313 can be hot melted at one time based on the hot melt process, thereby improving the fixing efficiency of the circuit board 32 on the isolation plate 31.

[0046] The second hot melt column 313 is integrally formed with the isolation plate 31 to improve the fastening of the second hot melt column 313 and the isolation plate 31, thereby ensuring the stability of the fixed circuit board 32 on the isolation plate 31. In addition, the opening size of the limiting hole 323 (long circular hole) on the circuit board 32 is greater than the cross-sectional size of the second hot melt column 313 on the isolation plate 31, so that after the circuit board 32 is fixed and limited by the second hot melt column 313, the circuit board 32 still has a certain amount of movement, thereby reducing the situation that the circuit board 32 is pulled and torn due to the thermal expansion of the battery monomer 22.

[0047] It should be noted that the limiting and fixing of the circuit board 32 on the isolation plate 31 can be fixed by the above-mentioned hot melt fixing, but also can be fixed by locking screws (such as insulating bolts), and the present application does not limit this. Compared with the case that the circuit board 32 is fixed on the isolation plate 31 by locking screws, the limiting of the circuit board 32 by the hot melt of the second hot melt column 313 can avoid damage to the isolation plate 31 and ensure the integrity of the isolation plate 31.

[0048] Further, as shown in FIGS. 5 and 7 or FIGS. 8 and 9, the isolation plate 31 has a first limiting groove 314 facing away from the battery monomer 22, the circuit board 32 is located in the first limiting groove 314, and the groove bottom of the first limiting groove 314 is provided with the second hot melt column 313. In this way, the circuit board 32 can be placed in the first limiting groove 314 on the isolation plate 31 in advance to realize the pre-positioning of the circuit board 32, and then the circuit board 32 is fixed and limited by the second hot melt column 313 to improve the fixing efficiency of the circuit board 32.

[0049] When the second hot melt column 313 is close to the groove wall of the first limiting groove 314, in order to avoid the interference of the isolation plate 31 with the hot melt equipment for hot melting the second hot melt column 313, the groove wall of the first limiting groove 314 can have a avoiding groove 315 corresponding to the second hot melt column 313 as shown in FIGS. 7 or 9. In this way, by providing the avoiding groove 315, the interference between the isolation plate 31 and the hot melt equipment is avoided, and the normal hot melting of the second hot melt column 313 is ensured.

[0050] For the connection between the circuit board 32 and the battery monomer 22, as shown in FIGS. 5 or 6, each sampling assembly 30 of the plurality of sampling assemblies 30 includes a plurality of sampling terminals 33 (such as nickel sheets) and a plurality of busbars 34. The plurality of busbars 34 are located on the side of the isolation plate 31 away from the battery monomer 22, and each busbar 34 is connected with the plurality of battery monomers 22. The plurality of sampling terminals 33 are spaced apart along the length direction of the circuit board 32, and each is connected with the circuit board 32. One sampling terminal 33 is connected with one busbar 34.

[0051] In the connection of the busbars 34 and the plurality of battery monomers 22, each battery monomer 22 has positive and negative electrode terminals, and the plurality of battery monomers 22 of the battery module 20 can be connected in series or in series-parallel connection after being connected by the plurality of busbars 34. When the plurality of battery monomers 22 are connected in series, each busbar 34 is connected to electrode terminals of different polarity of two battery monomers 22, so as to realize the series connection of the plurality of battery monomers 22. When the plurality of battery monomers 22 are connected in series-parallel, each busbar 34 is connected to electrode terminals of two groups of battery monomers 22, and the electrode terminals of each group of battery monomers 22 have the same polarity, and the electrode terminals of different groups of battery monomers 22 have different polarities, so as to realize the series-parallel connection of the plurality of battery monomers 22. For example, each busbar 34 is connected to electrode terminals of two pairs of battery monomers 22, the electrode terminals of each pair of battery monomers 22 have the same polarity, and the electrode terminals of the two pairs of battery monomers 22 have different polarities, so as to realize the series connection of the two-to-two parallel connection of the plurality of battery monomers 22.

[0052] In addition, the isolation plate 31 has a plurality of second limiting grooves facing away from the battery monomers 22, and the plurality of second limiting grooves correspond one-to-one to the plurality of busbars 34. Each busbar 34 is located in the corresponding second limiting groove, so as to limit the busbar 34 on the isolation plate 31, avoid the busbar 34 from shaking during the carrying of the sampling assembly 30, and cause the connection of the busbar 34, the battery monomer 22 and the sampling terminal 33 to be loose.

[0053] For the limiting of the busbar 34 in the second limiting groove on the isolation plate 31, the hot melting fixation of the circuit board 32 in the first limiting groove 314 described above can be referred to, so as to ensure the stability of the limiting of the busbar 34 in the second limiting groove, and further ensure the reliability of the connection of the busbar 34 and the electrode terminals of the battery monomer 22.

[0054] In some embodiments, as shown in FIGS. 3 and 4, the energy storage device 100 further includes a battery management system 40, which is located in the battery compartment of the battery box 10, and each sampling assembly 30 (circuit board 32) corresponding to each battery module 20 is connected to the battery management system 40 through a wire harness 50. In this way, the working condition parameters of the battery monomers 22 included in the plurality of battery modules 20 can be obtained through the battery management system 40, so as to realize the monitoring of the plurality of battery monomers 22.

[0055] In some embodiments, as shown in FIG. 3, and FIG. 5 or FIG. 6, the plurality of battery modules 20 includes a first battery module 24 and a second battery module 25 adjacent to each other in the length direction X of the battery box 10; the plurality of sampling assemblies 30 includes a first sampling assembly 35 and a second sampling assembly 36 corresponding to the first battery module 24 and the second battery module 25 respectively, the first sampling assembly 35 includes a plug 351 on an end of the circuit board 32 of the first sampling assembly 35 close to the second sampling assembly 36, the second sampling assembly 36 includes a first socket 361 on an end of the circuit board 32 of the second sampling assembly 36 close to the first sampling assembly 35, the first socket 361 is fixed on the isolation plate 31 of the second sampling assembly 36, and the plug 351 is plugged with the first socket 361.

[0056] Since the first socket 361 is directly fixed on the isolation plate 31 of the second sampling assembly 36, the fixing of the circuit board 32 of the second sampling assembly 36 is facilitated, and the integration of the second sampling assembly 36 is facilitated, so as to improve the assembly efficiency of the energy storage device 100. In addition, the first socket 361 can be directly fixed on the isolation plate 31, so that the auxiliary part (such as a fixing seat) arranged when the first socket 361 is fixed on the end plate 21 is avoided, so as to simplify the assembly of the second sampling assembly 36 on the second battery module 25. Furthermore, by plugging the circuit boards 32 of the first sampling assembly 35 and the second sampling assembly 36, the connection between the circuit boards 32 of the first sampling assembly 35 and the second sampling assembly 36 and the battery management system 40 is facilitated, and the connection between the battery monomers 22 of the first battery module 24 and the second battery module 25 and the battery management system 40 is facilitated.

[0057] Among them, for the plug 351 of the circuit board 32 of the first sampling assembly 35 and the first socket 361 of the circuit board 32 of the second sampling assembly 36, as shown in FIG. 5, the plug 351 is located on the end of the circuit board 32 of the first sampling assembly 35 close to the second battery module 25, and the first socket 361 is located on the end of the circuit board 32 of the second sampling assembly 36 close to the first battery module 24, i.e. the plug 351 and the first socket 361 are arranged adjacent to each other, so as to facilitate the plugging of the plug 351 and the first socket 361.

[0058] In some embodiments, as shown in FIG. 7, or FIG. 8 and FIG. 10, the first connector 361 comprises a first fixed plate 362 and a first connector base 363; the first fixed plate 362 is provided with a fixed hole 364, and the isolation plate 31 of the second sampling assembly 36 is provided with a first hot-melt column 311, the end of the first hot-melt column 311 is provided with a first cap (not shown in the figure), the fixed hole 364 is sleeved on the first hot-melt column 311, and the first cap is crimped on the first fixed plate 362; the first connector base 363 is fixed on the first fixed plate 362, and the first connector base 363 is connected with the connector head 351.

[0059] Therefore, after the first fixed plate 362 is sleeved on the first hot-melt column 311 of the isolation plate 31 based on the fixed hole 364, the fixation of the first fixed plate 362 on the isolation plate 31 can be realized based on the hot-melt process, and the fixation of the first connector 361 on the isolation plate 31 is realized. In addition, a plurality of fixed holes 364 are usually arranged on the first fixed plate 362, and a plurality of first hot-melt columns 311 corresponding to the fixed holes 364 are arranged on the isolation plate 31, and at this time, the hot-melt process can be used to realize the hot-melt of the plurality of first hot-melt columns 311 at one time, so as to improve the fixation efficiency of the first fixed plate 362 on the isolation plate 31.

[0060] In addition, the first hot-melt column 311 and the isolation plate 31 are integrally formed, so as to improve the fastening of the first hot-melt column 311 and the isolation plate 31, and further ensure the stability of the fixation of the first fixed plate 362 on the isolation plate 31. In addition, the opening size of the fixed hole 364 (long circular hole) on the first fixed plate 362 is greater than the cross-sectional size of the first hot-melt column 311 on the isolation plate 31, so as to ensure that the fixed hole 364 on the first fixed plate 362 can be sleeved on the first hot-melt column 311, and the assembly of the circuit board 32 on the isolation plate 31 is ensured. After the first fixed plate 362 is fixed and limited by the first hot-melt column 311, the first fixed plate 362 still has a certain activity allowance, so as to reduce the situation that the first connector 361 is torn due to the pulling of the first connector 361 caused by the thermal expansion of the battery monomer 22.

[0061] It should be noted that when the first fixed plate 362 is limited on the isolation plate 31 by means of hot melting, the isolation plate 31 can be provided with a corresponding avoiding groove 315 corresponding to the first hot melting column 311 to realize the avoidance of the hot melting equipment and avoid the interference between the hot melting equipment. In addition, the limiting and fixing of the first fixed plate 362 on the isolation plate 31 can be fixed by means of the above-mentioned hot melting, but also can be fixed by means of locking screws (such as insulating bolts), of course, the first fixed plate 362 can also be fixed on the isolation plate 31 by means of bonding, and the present application does not limit this. Compared with the case that the first fixed plate 362 is fixed on the isolation plate 31 by means of locking screws, the limiting of the first fixed plate 362 by means of the hot melting of the first hot melting column 311 can avoid the damage to the isolation plate 31 and ensure the integrity of the isolation plate 31.

[0062] Optionally, for the case that the first fixed plate 362 is fixed on the isolation plate 31 by means of the first hot melting column 311, as shown in FIG. 10, the first hot melting column 311 has a first stepped surface 312 facing the first cap, and the first fixed plate 362 is supported on the first stepped surface 312. In this way, the limiting height of the first plug-in seat 361 on the isolation plate 31 can be raised by the provision of the first stepped surface 312 on the first hot melting column 311, and the height of the plug-in connector 351 is further raised to reduce the friction between the end portion of the circuit board 32 close to the plug-in connector 351 included in the first sampling assembly 35 and the end plate 21 of the first battery module 24 and the second battery module 25, and prolong the service life of the first sampling assembly 35.

[0063] Of course, in addition to the provision of the first stepped surface 312 facing the first cap on the first hot melting column 311, the plug-in connector 351 can also include a support plate and a plug-in seat, the plug-in seat is fixed on the support plate, and the plug-in seat is plugged with the first plug-in base 363 included in the first plug-in seat 361. In this way, the height of the plug-in seat included in the plug-in connector 351 can be directly raised by the support plate, and the friction between the end portion of the circuit board 32 close to the plug-in connector 351 included in the first sampling assembly 35 and the end plate 21 of the first battery module 24 and the second battery module 25 is further reduced, and the service life of the first sampling assembly 35 is prolonged.

[0064] In some embodiments, as shown in FIG. 7 or FIG. 10, the circuit board 32 included in the first sampling assembly 35 has a first redundant section 321 located at the end portion of the circuit board 32 close to the plug-in connector 351.

[0065] Thus, when the plug 351 is plugged into the first plug seat 361, the first redundant section 321 can provide a certain assembly allowance, so as to facilitate the normal plugging of the plug 351 into the first plug seat 361, and at the same time ensure that the circuit board 32 included in the first sampling assembly 35 has a certain stretching allowance, so as to slow down the pulling of the circuit board 32 included in the first sampling assembly 35 when the battery cells included in the first battery module 24 and / or the second battery module 25 swell, and avoid the tearing of the circuit board 32 due to the pulling.

[0066] In some embodiments, at least part of the first redundant section 321 is located between the first battery module 24 and the second battery module 25.

[0067] Optionally, in combination with the above-mentioned case that the first plug seat 361 includes the first fixed plate 362 and the first plug base 363, at least part of the first plug base 363 can be located directly above the end plate 21 included in the second battery module 25 (i.e., away from the bottom side of the lower box body 11) close to the first battery module 24. In this way, the distance between the first plug base 363 and the plug 351 can be shortened, and after the plug 351 is plugged into the first plug base 363, the circuit board 32 included in the first sampling assembly 35 can be effectively prevented from contacting the end plate 21 of the second battery module 25, thereby avoiding the friction between the circuit board 32 included in the first sampling assembly 35 and the end plate 21 of the second battery module 25, and prolonging the service life of the first sampling assembly 35.

[0068] In some embodiments, as shown in FIG. 11, the surface of the circuit board 32 included in the first sampling assembly 35 towards the first battery module 24 has a buffer pad 352, and the buffer pad 352 is located at least in the region between the circuit board 32 and the end plate 21 included in the first battery module 24 close to the second battery module 25.

[0069] In some embodiments, as shown in FIG. 11, the surface of the circuit board 32 included in the first sampling assembly 35 towards the first battery module 24 has a buffer pad 352, and the buffer pad 352 is located at least in the region between the circuit board 32 and the end plate 21 included in the first battery module 24 close to the second battery module 25.

[0070] Therefore, by arranging the buffer pad 352, the friction between the circuit board 32 included in the first sampling assembly 35 and the end plate 21 of the first battery module 24 can be effectively avoided, thereby prolonging the service life of the first sampling assembly 35.

[0071] In some embodiments, the buffer pad 352 can be arranged between the circuit board 32 of the first sampling assembly 35 and the end plate 21 of the first battery module 24 close to the second battery module 25, that is, the projection of the buffer pad 352 on the bottom of the lower box 11 overlaps with the projection of the end plate 21 of the first battery module 24 close to the second battery module 25 on the bottom of the lower box 11. Alternatively, the buffer pad 352 can be arranged between the circuit board 32 of the first sampling assembly 35 and the end plate 21 of the first battery module 24 close to the second battery module 25, and between the circuit board 32 of the first sampling assembly 35 and the end plate 21 of the second battery module 25 close to the first battery module 24, that is, the projection of the buffer pad 352 on the bottom of the lower box 11 overlaps with the projection of the end plate 21 of the first battery module 24 close to the second battery module 25 on the bottom of the lower box 11, and the projection of the end plate 21 of the second battery module 25 close to the first battery module 24 on the bottom of the lower box 11.

[0072] In some embodiments, when the first plug-in base 363 included in the first plug-in seat 361 is directly above the end plate 21 of the second battery module 25, the buffer pad 352 can be arranged between the circuit board 32 of the first sampling assembly 35 and the end plate 21 of the first battery module 24 close to the second battery module 25, so as to avoid the friction between the circuit board 32 included in the first sampling assembly 35 and the end plate 21 of the first battery module 24.

[0073] In some embodiments, when the first plug-in base 363 included in the first plug-in seat 361 is directly above the end plate 21 of the second battery module 25, the buffer pad 352 can be arranged between the circuit board 32 of the first sampling assembly 35 and the end plate 21 of the first battery module 24 close to the second battery module 25, so as to avoid the friction between the circuit board 32 included in the first sampling assembly 35 and the end plate 21 of the first battery module 24.

[0074] In this way, when the first connector 361 is limited on the isolation plate 31 included in the second sampling assembly 36, the second redundant section 322 on the circuit board 32 included in the second sampling assembly 36 is provided, so as to provide a certain assembly allowance, so as to facilitate the guarantee that the fixing hole 364 on the first fixing plate 362 included in the first connector 361 is sleeved on the first hot melting column 311 of the isolation plate 31, that is, the smooth limiting of the first connector 361 on the isolation plate 31 is guaranteed; at the same time, the circuit board 32 included in the second sampling assembly 36 has a certain stretching allowance, so as to slow down the pulling of the circuit board 32 included in the second sampling assembly 36 when the battery cells included in the second battery module 25 swell, and avoid the tearing of the circuit board 32 due to the pulling.

[0075] In the embodiment of the application, the plurality of battery monomers 22 included in the battery module 20 can be in a series connection relationship, or in a series-parallel connection relationship, and the number of busbars 34 corresponding to the plurality of battery monomers 22 in different connection relationships is different. The fewer the number of busbars 34, the fewer the metal traces on the circuit board 32 included in the sampling assembly 30, and the more the number of busbars 34, the more the metal traces on the circuit board 32 included in the sampling assembly 30. For example, each battery module 20 includes 12 battery monomers 22, when the 12 battery monomers 22 are in a series-parallel connection relationship after being connected in parallel two by two, the sampling assembly 30 includes 7 busbars 34, and the circuit board 32 has corresponding 7 metal traces; when the 12 battery monomers 22 are in a series connection relationship, the sampling assembly 30 includes 13 busbars 34, and the circuit board 32 has corresponding 13 metal traces.

[0076] For example, the battery management system 40 is located on the side of the second battery module 25 away from the first battery module 24, at this time, the working condition parameters of the battery monomers 22 collected by the first sampling assembly 35 can be transmitted to the battery management system 40 through the second sampling assembly 36, at this time, the circuit board 32 included in the second sampling assembly 36 is not only used to collect the working condition parameters of the second battery module 25, but also used to transmit the working condition parameters of the first battery module 24. At this time, in combination with the above description, when the battery monomers 22 included in the battery module 20 are in a series-parallel connection relationship, the circuit board 32 included in the second sampling assembly 36 has 14 metal traces; when the battery monomers 22 included in the battery module 20 are in a series connection relationship, the circuit board 32 included in the second sampling assembly 36 has 26 metal traces.

[0077] The more the metal traces are, the more complex the design of the circuit board 32 is, and therefore, in order to simplify the design of the circuit board 32 included in the second sampling assembly 36, the circuit board 32 included in the second sampling assembly 36 can be one or multiple. When the second sampling assembly 36 includes one circuit board 32, the circuit board 32 is used not only to collect the working condition parameters of the battery cells 22 included in the second battery module 25, but also to transmit the working condition parameters of the battery cells 22 included in the first battery module 24; when the second sampling assembly 36 includes multiple circuit boards 32, for example, the second sampling assembly 36 includes two circuit boards 32, the two circuit boards 32 are arranged in a stack, and one of the two circuit boards 32 is used to collect the working condition parameters of the battery cells 22 included in the second battery module 25, and the other circuit board 32 is used to transmit the working condition parameters of the battery cells 22 included in the first battery module 24.

[0078] The specific number of the circuit boards 32 included in the second sampling assembly 36 can refer to the number of the battery modules 20 arranged along the length direction X of the battery box 10 in the battery compartment. Next, taking the example that the first battery module 24 and the second battery module 25 are arranged adjacent to each other along the length direction X of the battery box 10 in the battery compartment, at this time, as shown in FIG. 6, the circuit board 32 of the second sampling assembly 36 includes a circuit collection board 324 and a circuit transmission board 325, the circuit collection board 324 and the circuit transmission board 325 are arranged in a stack, the first plug-in seat 361 is located at the end of the circuit transmission board 325 away from the battery management system 40, so as to facilitate the connection with the plug-in head 351 on the circuit board 32 included in the first sampling assembly 35; the end of the circuit collection board 324 and the circuit transmission board 325 close to the battery management system 40 are connected with the battery management system 40.

[0079] In this way, the circuit collection board 324 and the circuit transmission board 325 are arranged in the second sampling assembly 36, so as to simplify the arrangement of the metal traces on the circuit board 32 included in the second sampling assembly 36, and facilitate the arrangement of the circuit board 32 included in the second sampling assembly 36 on the isolation board 31 included in the second sampling assembly 36.

[0080] The circuit collection board 324 and the circuit transmission board 325 are both flexible thin plates with metal traces, and the multiple sampling terminals 33 included in the second sampling assembly 36 are connected with the circuit collection board 324, so as to facilitate the collection of the working condition parameters of the battery cells 22 included in the second battery module 25 by the circuit collection board 324 and the transmission of the working condition parameters of the battery cells 22 included in the first battery module 24 by the circuit transmission board 325.

[0081] Wherein, the circuit collection plate 324 can be located between the circuit transmission plate 325 and the isolation plate 31, or as shown in FIG. 6, the circuit transmission plate 325 can be located between the circuit collection plate 324 and the isolation plate 31. Taking the case that the circuit transmission plate 325 is located between the circuit collection plate 324 and the isolation plate 31 as an example, in combination with the above description, the isolation plate 31 can be provided with two rows of second hot melt columns 313 along the length direction X of the battery box body 10, the circuit transmission plate 325 is located between the two rows of second hot melt columns 313, and the circuit collection plate 324 is directly limited on the second hot melt column 313. In addition, when limiting the circuit transmission plate 325 and the circuit collection plate 324, at least one of the opposite surfaces of the circuit transmission plate 325 and the circuit collection plate 324 can be provided with an insulating film layer, or an insulating film layer is arranged between the circuit transmission plate 325 and the circuit collection plate 324, so as to ensure the insulation between the circuit transmission plate 325 and the circuit collection plate 324.

[0082] Optionally, as shown in FIG. 8, and FIG. 10 or FIG. 11, the circuit transmission plate 325 has a third redundant section 3254 close to the first plug-in seat 361. In this way, the third redundant section 3254 close to the first plug-in seat 361 is arranged on the circuit transmission plate 325, so as to ensure that the end of the circuit transmission plate 325 close to the first plug-in seat 361 has a certain stretching allowance, thereby slowing down the pulling of the circuit transmission plate 325 when the battery cells included in the second battery module 25 swell, and avoiding the tearing of the circuit transmission plate 325 due to the pulling.

[0083] Wherein, for the case that the circuit transmission plate 325 is located between the circuit collection plate 324 and the isolation plate 31, in order to avoid that the third redundant section 3254 on the circuit transmission plate 325 is inflated and then props up the circuit collection plate 324 due to the swelling of the battery monomer 22 included in the second battery module 25, the third redundant section 3254 can be located between the end of the circuit collection plate 324 close to the first plug-in seat 361 and the first plug-in seat 361, so as to realize the exposure of the third redundant section 3254; or as shown in FIG. 10 or FIG. 11, the end of the circuit collection plate 324 close to the first plug-in seat 361 has a notch 3242, and the third redundant section 3254 is exposed at the notch 3242 on the circuit collection plate 324. In this way, the exposure of the third redundant section 3254 on the circuit transmission plate 325 can avoid the influence of the swelling of the battery monomer 22 on the circuit collection plate 324 after the third redundant section 3254 is inflated, and ensure that the circuit collection plate 324 can effectively collect the working condition parameters of the battery monomer 22 included in the second battery module 25.

[0084] In addition, the end of the circuit collection plate 324 is provided with the notch 3242, which can not only expose the third redundant section 3254 of the circuit transmission plate 325, but also save the material of the circuit collection plate 324, reduce the weight of the circuit collection plate 324, facilitate the heat dissipation of the circuit transmission plate 325 along the notch 3242, and improve the heat dissipation effect of the circuit transmission plate 325. In addition, the notch 3242 can also be used to realize the foolproof design of the circuit collection plate 324, so as to accurately identify the position of the second connector 3241 on the circuit collection plate 324.

[0085] In some embodiments, as shown in FIGS. 8 and 12, the end of the circuit collection plate 324 near the battery management system 40 (not shown in the figure) is provided with the second connector 3241, and the end of the circuit transmission plate 325 near the battery management system 40 is provided with the third connector 3251. The second connector 3241 and the third connector 3251 are both fixed on the isolation plate 31 included in the second sampling assembly 36 and are both electrically connected with the battery management system 40. In this way, the connection between the circuit collection plate 324, the circuit transmission plate 325, the second connector 3241, the third connector 3251 and the battery management system 40 can be facilitated to simplify the connection between the circuit collection plate 324, the circuit transmission plate 325 and the battery management system 40.

[0086] Optionally, the structure and fixing mode of the second connector 3241 and the third connector 3251 can refer to the structure and fixing mode of the first connector 361 described above. For example, as shown in FIG. 12, the second connector 3241 includes a second fixed plate 3243 and a second connector base 3244, and the third connector 3251 includes a third fixed plate 3252 and a third connector base 3253. The second fixed plate 3243 and the third fixed plate 3252 are both fixed on the isolation plate 31 included in the second sampling assembly 36, the second connector base 3244 is fixed on the second fixed plate 3243, and the third connector base 3253 is fixed on the third fixed plate 3252.

[0087] Further, the second connector base 3244 and the third connector base 3253 can be located on the side of the end plate 21 of the second battery module 25 away from the bottom of the lower box body 11. In this way, the distance between the second connector base 3244, the third connector base 3253 and the battery management system 40 can be shortened, and after the second connector base 3244 and the third connector base 3253 are connected with the battery management system 40 through the wire harness 50, the contact between the wire harness 50 and the end plate 21 of the second battery module 25 can be effectively avoided, thereby avoiding the contact between the wire harness 50 and the end plate 21 of the second battery module 25, and prolonging the service life of the wire harness 50.

[0088] The use electric device also comprises the energy storage device 100 described in the above embodiments, and the energy storage device 100 supplies power for the use electric device. Thus, in combination with the above description, the use electric device of the present application is convenient to improve the working stability of the use electric device based on the power consumption safety of the energy storage device 100 during use.

[0089] In the embodiments of the present application, the terms "first", "second", "third" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance; the term "multiple" refers to two or more, unless otherwise explicitly limited. The terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, "connecting" can be fixed connection, or detachable connection, or integrally connected; "connecting" can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0090] In the description of the embodiments of the present application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or units referred to must have a particular direction, be constructed and operated in a particular orientation, therefore, cannot be understood as a limitation on the embodiments of the present application.

[0091] In the description of the present application, the terms "one embodiment", "some embodiments", "a specific embodiment" and the like mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0092] The above is only the preferred embodiment of the present application, and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An energy storage device, wherein, The battery box (10) comprises a lower box (11) and a box cover (12) connected with the lower box (11) to enclose a battery compartment. A plurality of battery modules (20) are located in the battery compartment, each battery module (20) comprising a pair of end plates (21) arranged oppositely, and a plurality of battery cells (22) located between the pair of end plates (21), the plurality of battery modules (20) comprising a first battery module (24) and a second battery module (25) adjacent in the length direction of the battery box (10). A plurality of sampling assemblies (30) correspond one-to-one to the plurality of battery modules (20), and each sampling assembly (30) comprises an isolation plate (31) and a circuit board (32), the isolation plate (31) covering the plurality of battery cells (22) of the corresponding battery module (20), and the circuit board (32) being located on the side of the isolation plate (31) away from the battery cells (22) and connected with the plurality of battery cells (22) of the corresponding battery module (20). The plurality of sampling assemblies (30) comprise a first sampling assembly (35) and a second sampling assembly (36) corresponding to the first battery module (24) and the second battery module (25) respectively, the circuit board (32) of the first sampling assembly (35) has a plug (351) near the end of the second sampling assembly (36), the circuit board (32) of the second sampling assembly (36) has a first plug seat (361) near the end of the first sampling assembly (35), the first plug seat (361) is fixed on the isolation plate (31) of the second sampling assembly (36), and the plug (351) is plugged with the first plug seat (361). The first plug seat (361) comprises a first fixed plate (362) and a first plug base (363).

2. The energy storage device of claim 1, wherein, The first fixed plate (362) has a fixed hole (364), the isolation plate (31) of the second sampling assembly (36) is provided with a first hot melt column (311), the end of the first hot melt column (311) has a first cap, the fixed hole (364) is sleeved on the first hot melt column (311), and the first cap is crimped on the first fixed plate (362). The first plug base (363) is fixed on the first fixed plate (362), and the first plug base (363) is plugged with the plug (351). The first hot melt column (311) has a first step surface (312) facing the first cap, and the first fixed plate (362) is supported on the first step surface (312).

3. The energy storage device of claim 2, wherein, The circuit board (32) of the first sampling assembly (35) has a first redundant section (321) located at the end of the circuit board (32) near the plug (351).

4. The energy storage device of claim 1, wherein, The first plug seat (361) comprises a first fixed plate (362) and a first plug base (363).

5. The energy storage device of claim 1, wherein, ​ The first fixed plate (362) is fixed on the isolation plate (31) included in the second sampling assembly (36), the first plug-in base (363) is fixed on the first fixed plate (362), at least part of the first plug-in base (363) is located directly above the end plate (21) of the second battery module (25) close to the first battery module (24), and the first plug-in base (363) is plugged with the plug-in head (351).

6. The energy storage device of claim 1, wherein, The circuit board (32) included in the first sampling assembly (35) has a buffer pad (352) on the surface facing the first battery module (24); The buffer pad (352) is located at least in the area between the circuit board (32) and the end plate (21) of the first battery module (24) close to the second battery module (25).

7. The energy storage device of claim 1, wherein, Each of the plurality of sampling assemblies (30) includes a plurality of busbars (34) and a plurality of sampling terminals (33); A plurality of the busbars (34) are located on the side of the isolation plate (31) away from the battery monomer (22), and each of the busbars (34) is connected with a plurality of the battery monomers (22), a plurality of the sampling terminals (33) are spaced along the length direction of the circuit board (32), and each of the sampling terminals (33) is connected with the circuit board (32), one of the sampling terminals (33) is connected with one of the busbars (34); The circuit board (32) included in the second sampling assembly (36) has a second redundant section (322), the second redundant section (322) is located between the first plug-in base (361) and one of the sampling terminals (33) adjacent to the first plug-in base (361).

8. The energy storage device of any one of claims 1-7, wherein, The energy storage device (100) includes a battery management system (40), the battery management system (40) is located in the battery compartment and on the side of the second battery module (25) away from the first battery module (24); The circuit board (32) of the second sampling assembly (36) includes a circuit acquisition board (324) and a circuit transmission board (325), the circuit acquisition board (324) and the circuit transmission board (325) are stacked, the first plug-in base (361) is located at the end of the circuit transmission board (325) away from the battery management system (40), and the end of the circuit acquisition board (324) close to the battery management system (40) has a second plug-in base (3241), and the end of the circuit transmission board (325) close to the battery management system (40) has a third plug-in base (3251); The second plug-in base (3241) and the third plug-in base (3251) are both fixed on the isolation plate (31) included in the second sampling assembly (36), and are both electrically connected with the battery management system (40).

9. The energy storage device of claim 8, wherein, The second connector (3241) comprises a second fixed plate (3243) and a second connector base (3244), and the third connector (3251) comprises a third fixed plate (3252) and a third connector base (3253); The second fixed plate (3243) and the third fixed plate (3252) are fixed on an isolation plate (31) included in the second sampling assembly (36), the second connector base (3244) is fixed on the second fixed plate (3243), the third connector base (3253) is fixed on the third fixed plate (3252), and the second connector base (3244) and the third connector base (3253) are located on a side of an end plate (21) included in the second battery module (25) away from the bottom of the lower box body (11).

10. The energy storage device of claim 8, wherein, The circuit transmission plate (325) is located between the circuit collection plate (324) and the isolation plate (31); The circuit transmission plate (325) has a third redundant section (3254) close to the first connector (361), and an end of the circuit collection plate (324) has a notch (3242), and the third redundant section (3254) is exposed at the notch (3242).

11. The energy storage device of any one of claims 1-7, wherein, The circuit board (32) has a limiting hole (323), the isolation plate (31) is provided with a second hot melt column (313), an end of the second hot melt column (313) has a second cap, the limiting hole (323) is sleeved on the second hot melt column (313), and the second cap is located on a side of the circuit board (32) away from the isolation plate (31).

12. The energy storage device of claim 11, wherein, The isolation plate (31) has a first limiting groove (314), the circuit board (32) is located in the first limiting groove (314), a groove bottom of the first limiting groove (314) is provided with the second hot melt column (313), and a groove wall of the first limiting groove (314) has an avoiding groove (315) corresponding to the second hot melt column (313).

13. The energy storage device of any one of claims 1-7, wherein, The end plate (21) is an insulating plate and has a second stepped surface (214) facing away from the bottom of the lower box body (11) and a mounting hole (211) penetrating through the end plate (21) on the second stepped surface (214) in the height direction of the battery box body (10); The battery module (20) comprises a locking bolt (212), the locking bolt (212) has a locking cap (213), the locking bolt (212) is fixedly connected with the bottom of the lower box body (11) through the mounting hole (211), and the locking cap (213) abuts against the second stepped surface (214).

14. An electrical device, comprising: The power utilization equipment comprises the energy storage device (100) in any one of the preceding claims 1-13, and the energy storage device (100) supplies power to the power utilization equipment.

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