Energy storage device and electric apparatus

Abstract

The present application relates to the technical field of energy storage. Disclosed are an energy storage device and an electric apparatus. The energy storage device comprises: battery modules, which each comprise fixed end plates and an insulating plate; and a plurality of circuit boards, which include a first circuit board having a first plug-in base and a first plug-in connector, and a second circuit board having a second plug-in connector and a bent portion, wherein the first plug-in base is fixed to the fixed end plates of a first battery module, an insulating member is provided on the surface of the bent portion, and there is an overlapping area between the orthographic projection of the insulating member on a second battery module and the fixed end plates and / or the insulating plate of the second battery module. In the embodiments of the present application, by means of the arrangement of the circuit boards, the space in a battery compartment is saved on, thereby improving the space utilization rate and also improving the electrical safety; in addition, the fixation of the first plug-in connector, the first plug-in base and the fixed end plates can avoid a situation in which the first plug-in connector and the second plug-in connector are suspended after connection, thereby avoiding a situation in which the first circuit board and the second circuit board are torn or even broken due to pulling.

Description

Energy storage device and electric equipment

[0001] Cross-reference to related applications

[0002] The present disclosure claims priority to Chinese Patent Application No. 202411126816.9, 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 battery cells included in the battery module are transmitted to the battery management system (BMS) by a wiring collection method. Specifically, 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. The wiring collection method described above not only has a large wire diameter of the wire harness of part of the battery modules, which occupies a large internal space and causes a low utilization rate of the internal space of the battery pack, but also increases the manufacturing cost of the battery pack. In addition, the number of connection lines is large, the wire harness is complex, and the electrical safety is poor. SUMMARY

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

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

[0007] According to an aspect of the present application, a battery energy storage device is provided, comprising: a battery box body comprising a lower box body and a box cover, the box cover being fixedly 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 fixed end plates arranged oppositely, a plurality of battery cells located between the pair of fixed end plates, and an insulation plate located between the fixed end plates and the adjacent battery cells, the plurality of battery cells being arranged along the length direction of the battery box body, the plurality of battery modules comprising a first battery module and a second battery module adjacent in the length direction of the battery box body; a plurality of circuit boards corresponding to the plurality of battery modules one-to-one, each of the circuit boards being arranged on the top of the corresponding battery module and connected with the plurality of battery cells of the corresponding battery module, the plurality of circuit boards comprising a first circuit board and a second circuit board corresponding to the first battery module and the second battery module respectively; an end portion of the first circuit board having a first connector assembly, the first connector assembly comprising a first plug-in base and a first plug-in connector fixedly connected, the first plug-in base being fixed on the fixed end plate of the first battery module, an end portion of the second circuit board having a second plug-in connector and a curved portion, the second plug-in connector being connected with the first plug-in connector, the curved portion being provided with a sheet-shaped insulation piece towards the surface of the second battery module, the orthographic projection of the insulation piece on the second battery module having an overlapping area with the fixed end plate and / or the insulation plate of the second battery module.

[0008] In the embodiment of the present application, the connecting lines between the battery management module and the plurality of battery monomers included in each battery module are replaced by circuit boards to simplify the connection between the battery management module and each battery module, thereby saving space in the battery compartment and improving space utilization. In addition, the first plug connector is fixed on the fixed end plate of the first battery module through the first plug base, which can avoid the situation that the first plug connector and the second plug connector are suspended between the first battery module and the second battery module after connection, thereby avoiding the situation that the first plug connector and the second plug connector pull the first circuit board and the second circuit board due to their own gravity, causing the first circuit board and the second circuit board to tear or even break, and causing the connection between the first plug connector and the second plug connector to loosen and cause poor contact. Furthermore, by providing an insulating member on the surface of the curved portion of the second circuit board, the end portion of the second circuit board near the second plug connector can be raised to facilitate the insertion of the second plug connector into the first plug connector, and at the same time, a protruding structure can be formed on the second circuit board near the second plug connector, i.e. a buffer allowance can be formed on the second circuit board near the second plug connector to avoid pulling the second circuit board when the battery monomers included in the second battery module expand due to heat, etc. At the same time, it can avoid friction between the second circuit board and the insulating plate, causing the second circuit board to leak electricity, or even causing the second circuit board to break down; and it can also avoid conduction between the second circuit board and the fixed end plate, causing the fixed end plate or even the battery box to be electrified, thereby ensuring the electrical safety of the energy storage device.

[0009] According to an aspect of the present application, an electrical device is provided, which comprises the energy storage device of the above-mentioned aspect, and the energy storage device supplies power to the electrical device.

[0010] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit 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 an exploded structural schematic diagram of an energy storage device according to an example embodiment.

[0014] FIG. 3 is an axial side structural schematic diagram of a battery module according to an example embodiment.

[0015] FIG. 4 is an enlarged structural schematic diagram of the A area of the battery module shown in FIG. 3.

[0016] Figure 5 is an enlarged structural diagram of region B of the battery module shown in Figure 3.

[0017] Figure 6 is an exploded view of a battery module according to an exemplary embodiment.

[0018] Figure 7 is an exploded view of another battery module according to an exemplary embodiment.

[0019] Figure 8 is an enlarged structural diagram of a local area of ​​the battery module shown in Figure 6.

[0020] Figure 9 is a schematic diagram of a structure with an insulating element according to an exemplary embodiment.

[0021] Figure 10 is a schematic diagram of a structure without an insulating element according to an exemplary embodiment.

[0022] Figure 11 is an enlarged structural diagram of a local area of ​​the battery module shown in Figure 7.

[0023] Figure 12 is an axial-side exploded view of a battery module according to an exemplary embodiment.

[0024] Figure 13 is an enlarged structural diagram of a local area of ​​the battery module shown in Figure 12.

[0025] Figure 14 is an exploded top view of a battery module according to an exemplary embodiment.

[0026] Figure 15 is an enlarged structural diagram of a local area of ​​the battery module shown in Figure 14.

[0027] The reference numerals in the attached drawings are explained as follows: 100, Energy storage device; 200, Power conversion device; 300, User load; 10, Battery housing; 20, Battery module; 30, Circuit board; 40, Battery management module; 50, Wire; 11, Lower housing; 12, Housing cover; 20a, First battery module; 20b, Second battery module; 21, Fixed end plate; 22, Battery cell; 23, Cable tie; 24, Insulating plate; 25, Connecting piece; 26, Isolating plate; 211, Limiting groove; 212, Limiting hole; 30a, First circuit board; 30b, Second circuit board; 31, First connector assembly; 32, Second connector; 33, Bend; 34, Insulating component; 35, Buffer component; 36, Second plug-in base; 37, Connecting circuit; 311. First plug-in base; 312. First plug-in connector; 313. First base; 314. Limiting protrusion; 315. Limiting buckle; 316. Limiting surface; 3151. Limiting post; 3152. Outer surface; 3153. Protrusion; 3154. First surface; 3155. Second surface. DETAILED DESCRIPTION

[0028] Example implementations are now described with reference to the drawings. Example implementations can, however, 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 inventive aspects of the example implementations to those skilled in the art. Like reference numerals refer to like elements throughout the specification, thus detailed descriptions of them will be omitted.

[0029] 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 form of energy by a medium or device into the same form of energy or convert into another form of energy, and then release it in a specific energy form based on future application.

[0030] 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, so it may cause the problem of "abandoning wind and light" due to insufficient electricity demand or insufficient grid accommodation capacity.

[0031] In order to solve the problem of insufficient electricity demand or insufficient grid accommodation capacity, it is necessary to rely on energy storage devices. That is, through energy storage devices, electric energy is converted into other forms of energy by physical or chemical means for storage, and when needed, the energy stored in the energy storage device is converted into electric energy for release. In short, the energy storage device is similar to a large "power bank", which stores electric energy when light energy and wind energy are sufficient, and releases the stored electric energy when needed.

[0032] The current energy storage (i.e. energy storage) application scenarios are relatively wide, including power generation side energy storage, power grid side energy storage, renewable energy grid-connected energy storage, and user side energy storage, etc. The corresponding types of energy storage devices include:

[0033] (1) Large energy storage containers applied in power 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 electric energy in time and space, enhance renewable energy consumption capacity, and have great significance in power grid system backup, relieving peak load power supply pressure and peak regulation;

[0034] (2) The small and medium-sized energy storage cabinet applied in the commercial energy storage scene of the user side (bank, shopping mall, etc.) and the small household energy storage box applied in the household energy storage scene of the user side, the main operation mode of which is “peak load shifting”. Due to the large price difference between the electricity price in the peak and valley positions according to the electricity demand, after the user has the energy storage device, in order to reduce the cost, the energy storage device (energy storage cabinet / box) is usually charged in the low electricity price valley period; and the electricity in the energy storage device is discharged for use in the high electricity price peak period, so as to achieve the purpose of saving electricity cost. In addition, in remote areas and areas where natural disasters such as earthquakes and hurricanes are prone to occur, the existence of household energy storage devices is equivalent to that the user provides a standby power source for himself and the power grid, which eliminates the inconvenience caused by frequent power outages due to disasters or other reasons.

[0035] Taking the outdoor energy storage scene in the grid side energy storage as an example, FIG. 1 illustrates a schematic diagram of an energy storage system provided by the embodiment of the present application, which 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 at the electricity price peak or when the power grid is powered off.

[0036] And in the case of energy storage by physical or electrochemical means as described above, taking electrochemical energy storage as an example, the energy storage device 100 includes at least one chemical battery, which uses chemical elements in the chemical battery as energy storage medium to realize the charging and discharging process through chemical reaction or change of the energy storage medium. In simple terms, the electric energy generated by light energy and wind energy is stored in at least one group of chemical batteries through chemical reaction or change of the energy storage medium, and then the electric quantity stored in the at least one group of chemical batteries is released for use through chemical reaction or change of the energy storage medium when the use of external electric energy reaches the peak, or transferred to a place where the electric quantity is in short supply for use.

[0037] The embodiment of the present application provides an energy storage device 100, which can be a battery pack, a battery box, a battery system, etc. composed of battery monomers 22. The battery monomer 22 can be a lithium ion secondary battery, a lithium-sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, etc., and the battery monomer 22 can be in the form of a cylinder, a flat body, a cuboid, etc., which is not limited in the embodiment of the present application.

[0038] In some embodiments, as shown in FIG. 2, the energy storage device 100 includes a battery box 10 and a plurality of battery modules 20, the battery box 10 includes a lower box 11 and a box cover 12, and the box cover 12 is fixedly connected with the lower box 11 to enclose a battery compartment; the plurality of battery modules 20 are located in the battery compartment.

[0039] Among them, the battery modules 20 contained 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, as shown in FIG. 2, the battery compartment of the battery box 10 contains 2 rows along the length direction Y of the battery box 10 and 4 columns along the width direction X of the battery box 10 battery modules 20, that is, the battery compartment contains 8 battery modules 20.

[0040] As shown in FIGS. 3 and 4, the battery module 20 includes a pair of fixed end plates 21 arranged oppositely, and a plurality of battery monomers 22 located between the pair of fixed end plates 21.

[0041] Among them, as shown in FIG. 4, the plurality of battery monomers 22 and the pair of fixed end plates 21 can be fixed by a binding tool such as a cable tie 23, the plurality of battery monomers 22 are arranged along the length direction Y of the battery box 10, and the plurality of battery monomers 22 are connected by a connecting piece 25 to realize series connection or series-parallel connection between the plurality of battery monomers 22. For example, the plurality of battery monomers 22 are connected in series in turn, at this time each connecting piece 25 is connected with two electrode terminals of the same polarity on the two battery monomers 22 respectively; or, the plurality of battery monomers 22 are connected in parallel two by two and then connected in series, at this time each connecting piece 25 is connected with four electrode terminals of the same polarity on the four battery monomers 22 respectively.

[0042] It should be noted that the outer wall of each battery monomer 22 is covered with an insulating blue film to avoid safety hazards caused by shell leakage of the battery monomer 22; since the fixed end plate 21 is usually made of aluminum or other structures with certain strength, at this time, as shown in FIGS. 3 and 4, the battery module 20 includes an insulating plate 24 located between the fixed end plate 21 and the adjacent battery monomer 22 to avoid the burr on the fixed end plate 21 from piercing the insulating blue film on the battery monomer 22, and to avoid the battery monomer 22 from causing the fixed end plate 21 to be electrified after leakage.

[0043] In addition, as shown in FIGS. 3 and 5, the energy storage device 100 further includes a battery management module 40, the battery management module 40 is connected with the battery monomers 22 included in each battery module 20 in the battery compartment to obtain the working condition parameters such as voltage, current and temperature of each battery monomer 22, and to realize monitoring of each battery monomer 22.

[0044] In the related art, the battery management system and each battery monomer 22 are connected through wiring to collect the working condition parameters, that is, one end of the connecting wire is connected to the interface end of the battery management system, and the other end is connected to the battery monomer 22. However, with the demand for high capacity, the number of battery modules 20 in the battery compartment is increasing, that is, the number of battery monomers 22 is increasing. The wiring collection method not only has a large wire diameter of the wire harness of part of the battery modules 20, but also occupies a large internal space of the battery compartment, resulting in low utilization of the space in the battery compartment and increasing the manufacturing cost of the energy storage device 100. In addition, the number of connecting wires is large, the wire harness is complex, and the electrical safety is poor.

[0045] To solve the above technical problems, the present application provides an energy storage device 100 as shown in FIG. 6 or FIG. 7, which includes a plurality of circuit boards 30, and the plurality of circuit boards 30 correspond to the plurality of battery modules 20 one by one. Each circuit board 30 is arranged on the top of the corresponding battery module 20 and is connected to the plurality of battery monomers 22 of the corresponding battery module 20.

[0046] In this way, the connecting wires between the battery management module 40 and the plurality of battery monomers 22 included in each battery module 20 are replaced by the circuit board 30 to simplify the connection between the battery management module 40 and each battery module 20, thereby saving the space in the battery compartment and improving the space utilization. In addition, the arrangement of the circuit board 30 avoids the complex wire harness and improves the safety of the energy storage device 100.

[0047] The circuit board 30 can be a FPC (Flexible Printed Circuit) or a FFC (Flexible Flat Cable) and the like.

[0048] Each circuit board 30 has a plurality of collection terminals, and the plurality of collection terminals correspond to the plurality of connecting pieces 25 on the corresponding battery module 20 one by one. Each collection terminal is connected to the corresponding connecting piece 25 to collect the working condition parameters of the plurality of battery monomers 22 included in the corresponding battery module 20.

[0049] In addition, as shown in FIG. 6 or FIG. 7, the energy storage device 100 further includes a plurality of isolation plates 26 corresponding to the plurality of battery modules 20 one by one. Each isolation plate 26 is located on the top of the corresponding battery module 20, and the plurality of connecting pieces 25 included in each battery module 20 and the corresponding circuit board 30 are limited on the isolation plate 26.

[0050] The isolation plate 26 can be a plate-shaped structure made of insulating material such as plastic plate, so as to realize effective isolation between the battery monomer 22 and the connecting piece 25 and the circuit board 30. The isolation plate 26 has a plurality of first limiting grooves 211 and second limiting grooves 211 facing away from the battery monomer 22, each connecting piece 25 is limited in a first limiting groove 211, and the circuit board 30 is limited in a second limiting groove 211, so as to realize the limiting of the plurality of connecting pieces 25 and the circuit board 30 on the isolation plate 26, and avoid the shaking of the connecting piece 25 and the circuit board 30.

[0051] In some embodiments, as shown in FIG. 6 or FIG. 7, the plurality of battery modules 20 includes a first battery module 20a and a second battery module 20b adjacent in the length direction of the battery box 10; and the plurality of circuit boards 30 includes a first circuit board 30a and a second circuit board 30b corresponding to the first battery module 20a and the second battery module 20b respectively.

[0052] The first circuit board 30a is located above the first battery module 20a, the second circuit board 30b is located above the second battery module 20b, and the first circuit board 30a is electrically connected with the second circuit board 30b.

[0053] The battery management module 40 is located on the side of the first battery module 20a away from the second battery module 20b, and the first battery module 20a and the battery management module 40 have a wire 50 therebetween. At this time, the second circuit board 30b is connected with the first circuit board 30a first, and then connected with the battery management module 40 through the wire 50, so as to realize the connection of the battery monomers 22 included in the first battery module 20a and the second battery module 20b with the battery management module 40, thereby simplifying the connection between the second circuit board 30b and the battery management module 40, further saving the space in the battery compartment, and improving the space utilization.

[0054] In some embodiments, as shown in FIG. 6 and FIG. 8, the end of the first circuit board 30a has a first connector assembly 31, the first connector assembly 31 includes a first plug-in base 311 and a first plug-in connector 312 fixedly connected, the first plug-in base 311 is fixed on the fixed end plate 21 of the first battery module 20a, the end of the second circuit board 30b has a second plug-in connector 32 and a bending part 33, the first plug-in connector 312 is connected with the second plug-in connector 32, the bending part 33 is provided with a sheet-shaped insulating piece 34 facing the surface of the second battery module 20b, and the normal projection of the insulating piece 34 on the second battery module 20b overlaps with the fixed end plate 21 and / or the insulating plate 24 of the second battery module 20b.

[0055] In the embodiment, the first connector 312 is fixed on the fixed end plate 21 of the first battery module 20a through the first connector base 311, so that the first connector 312 and the second connector 32 are not suspended between the first battery module 20a and the second battery module 20b after being connected, and the first connector 312 and the second connector 32 do not pull the first circuit board 30a and the second circuit board 30b due to their own gravity, so that the first circuit board 30a and the second circuit board 30b are not torn or even broken, and the connection between the first connector 312 and the second connector 32 is not loosened and not in poor contact. In addition, the bending part 33 can provide a certain assembly allowance, so as to ensure the normal insertion of the first connector 312 and the second connector 32, and ensure that the first circuit board 30a has a certain stretching allowance, so as to slow down the pulling of the first circuit board 30a when the battery cells 22 included in the first battery module 20a and / or the second battery module 20b expand, and avoid tearing the first circuit board 30a. Furthermore, the insulating part 34 is arranged on the surface of the bending part 33 on the second circuit board 30b, so as to raise the end of the second circuit board 30b close to the second connector 32, facilitate the insertion of the second connector 32 and the first connector 312, and form a convex structure on the second circuit board 30b close to the second connector 32, so as to form a buffer allowance on the second circuit board 30b close to the second connector 32, avoid the pulling of the second circuit board 30b when the battery cells 22 included in the second battery module 20b expand, and avoid the friction between the second circuit board 30b and the insulating plate 24, the leakage of the second circuit board 30b, and the fracture of the second circuit board 30b, and avoid the conduction between the second circuit board 30b and the fixed end plate 21, the electrification of the fixed end plate 21 and the battery box 10, and the safety of the energy storage device 100.

[0056] Furthermore, when the insulating part 34 is arranged between the second circuit board 30b and the second battery module 20b, as shown in FIGS. 9 and 10, the end of the second circuit board 30b close to the second connector 32 is raised, so as to shorten the redundancy of the second circuit board 30b between the first and second battery modules 20b, so as to avoid the excessive bending of the bending part 33 on the second circuit board 30b after the fixed end plates 21 of the first and second battery modules 20b are close to each other due to the thermal expansion of the battery cells 22, that is, compared with the case without the insulating part 34, the distance between the lowest point of the bending part 33 and the upper surface of the fixed end plate 21 can be reduced from L1 to L2, so as to avoid the breaking of the end of the bending part 33 on the second circuit board 30b.

[0057] The first connector 312 and the second connector 32 are one male connector and the other female connector, so as to realize the plug-in connection of the first connector 312 and the second connector 32. For example, the first connector 312 is a male connector, and the second connector 32 is a female connector.

[0058] Optionally, the first connector base 311 and the first connector 312 of the first circuit board 30a are in an integrated structure, so as to facilitate the fixation of the first connector 312 on the fixed end plate 21 of the first battery module 20a, and improve the fixation efficiency of the first circuit board 30a.

[0059] In some embodiments, as shown in FIGS. 4 and 8, the end of the first circuit board 30a close to the first connector 312 is provided with a buffer 35 towards the surface of the first battery module 20a, and the buffer 35 is located in the area between the first circuit board 30a and the insulating plate 24 of the first battery module 20a.

[0060] The buffer 35 (such as buffer foam) is arranged between the first circuit board 30a and the insulating plate 24 of the first battery module 20a, so as to form a foam protection between the first circuit board 30a and the insulating plate 24 of the first battery module 20a, avoid the friction between the first circuit board 30a and the insulating plate 24, and cause the leakage of the first circuit board 30a, or even the fracture failure of the first circuit board 30a; and the end of the first circuit board 30a close to the first connector 312 is raised, so as to form a convex structure on the first circuit board 30a close to the first connector 312, that is, the buffer 35 can be extruded to form a buffer allowance on the first circuit board 30a close to the first connector 312, so as to avoid the pulling of the first circuit board 30a when the battery monomer 22 included in the first battery module 20a is subjected to thermal expansion.

[0061] In the embodiments of the present application, the surface of the curved portion 33 of the second circuit board 30b is provided with the insulating piece 34, and the orthographic projection of the insulating piece 34 on the second battery module 20b can coincide with the insulating plate 24 of the second battery module 20b, or coincide with the fixed end plate 21 of the second battery module 20b, or coincide with both the fixed end plate 21 and the insulating plate 24 of the second battery module 20b.

[0062] When the orthographic projection of the insulating member 34 on the second battery module 20b overlaps with the insulating plate 24 of the second battery module 20b, the insulating member 34 can be insulating foam having insulating properties or can be buffer foam not having insulating properties; when the orthographic projection of the insulating member 34 on the second battery module 20b overlaps with the fixed end plate 21 of the second battery module 20b, the insulating member 34 can be insulating foam having insulating properties.

[0063] In addition, when the orthographic projection of the insulating member 34 on the second battery module 20b overlaps with the insulating plate 24 of the second battery module 20b, as shown in FIGS. 7 and 11, the end portion of the second circuit board 30b further has a second plug-in base 36 fixedly connected with the second plug-in head 32, and the energy storage device 100 further includes a connecting circuit 37, the second plug-in base 36 is fixed on the fixed end plate 21 of the second battery module 20b, and the connecting circuit 37 is connected with the first plug-in head 312 and the second plug-in head 32 respectively.

[0064] In this way, the fixation of the first circuit board 30a and the second circuit board 30b on the first battery module 20a and the second battery module 20b respectively can be realized in advance, and at the same time, the displacement of the first circuit board 30a and the second circuit board 30b during the separate carrying of the first battery module 20a and the second battery module 20b can be avoided, so that the assembly efficiency of the energy storage device 100 is improved, and the assembly yield of the energy storage device 100 is ensured. In addition, due to the fixation of the first plug-in head 312 and the second plug-in head 32 on the first plug-in base 311 and the second plug-in base 36 respectively, the shaking of the first plug-in head 312 and the second plug-in head 32 during the carrying of the energy storage device 100 is avoided, the loosening of the connection between the first plug-in head 312 and the second plug-in head 32 and the poor contact phenomenon are avoided, and the tearing or even breaking of the first circuit board 30a and the second circuit board 30b caused by pulling the first circuit board 30a and the second circuit board 30b is avoided.

[0065] Among them, the first plug-in head 312 of the first circuit board 30a and the second plug-in head 32 of the second circuit board 30b can be that the first plug-in head 312 and the second plug-in head 32 are both plug-in male heads, at this time, the two ends of the connecting circuit 37 are both plug-in female heads; or the first plug-in head 312 and the second plug-in head 32 are both plug-in female heads, at this time, the two ends of the connecting circuit 37 are both plug-in male heads; or one of the first plug-in head 312 and the second plug-in head 32 is a plug-in male head, and the other is a plug-in female head, at this time, the two ends of the connecting circuit 37 are a plug-in male head and a plug-in female head respectively.

[0066] For the case that the first connector 312 and the second connector 32 are both male connectors, it is convenient to realize the fool-proof design of the first circuit board 30a and the second circuit board 30b during manufacturing, and it is also convenient to realize the fixed connection of the first connector 312 and the second connector 32 on the first connector base 311 and the second connector base 36, respectively.

[0067] Optionally, the length of the connecting circuit 37 is greater than the spacing between the first battery module 20a and the second circuit module, so as to provide a certain buffer margin between the first connector 312 and the second connector 32 through the connecting circuit 37, avoid the pulling of the connecting circuit 37 caused by the thermal expansion of the battery monomer 22 included in the first battery module 20a and / or the second battery module 20b, and thus ensure the stability of the connection of the connecting circuit 37 with the first connector 312 and the second connector 32.

[0068] Optionally, the first connector base 311 and the first connector 312 are in an integrated structure, and the second connector base 36 and the second connector 32 are in an integrated structure, so as to facilitate the simplification of the fixation of the first connector 312 and the second connector 32 on the fixed end plate 21 of the first battery module 20a and the fixed end plate 21 of the second battery module 20b, respectively, and thus improve the fixation efficiency of the first circuit board 30a and the second circuit board 30b.

[0069] Optionally, the first connector 312 on the first circuit board 30a and the second connector 32 on the second circuit board 30b both face away from the battery module 20, so as to facilitate the connection of the connecting circuit 37 with the first connector 312 and the second connector 32, respectively, and thus improve the assembly efficiency; at the same time, the connecting circuit 37 can also ensure the connection stability with the first connector 312 and the second connector 32 under the action of its own gravity.

[0070] In the present application, for the first connector base 311 and the second connector base 36 included in the first circuit board 30a and the second circuit board 30b, their structures can be the same or different. Next, the first connector base 311 will be taken as an example for detailed explanation, and the specific structure of the second connector base 36 can refer to the specific structure of the first connector base 311.

[0071] In some embodiments, as shown in FIGS. 12 and 13, and FIGS. 14 and 15, the first connector base 311 includes a first base 313, a limiting protrusion 314, and a limiting buckle 315; the limiting protrusion 314 and the limiting buckle 315 are both located on the lower surface of the first base 313, and the limiting buckle 315 has a limiting surface 316 facing the first base 313; the fixed end plate 21 of the first battery module 20a has a limiting groove 211 and a limiting hole 212, the limiting protrusion 314 is limited in the limiting groove 211, the limiting buckle 315 is located in the limiting hole 212, and the limiting surface 316 cooperates with the limiting hole 212 for limiting.

[0072] Thus, when the first plug-in base 311 is fixed on the fixed end plate 21 of the first battery module 20a, only the plug-in of the first plug-in base 311 on the fixed end plate 21 is needed to realize the fixation of the first plug-in base 311, thereby improving the quickness of the assembly of the first plug-in base 311; moreover, through the setting of the limiting protrusion 314 and the limiting buckle 315, the stability of the fixation of the first plug-in base 311 on the fixed end plate 21 after the plug-in cooperation of the first plug-in base 311 and the fixed end plate 21 is ensured, and the rotatable condition of the first plug-in base 311 is avoided.

[0073] The limiting protrusion 314 included in the first plug-in base 311 can be a circular protruding column, a rectangular protruding column, etc., and correspondingly, the limiting slot 211 on the fixed end plate 21 can be a cylindrical slot, a rectangular column slot, etc. For the case that the limiting protrusion 314 is a rectangular protruding column and the limiting slot 211 is a rectangular column slot, it is convenient to avoid the rotation of the first plug-in base 311 relative to the fixed end plate 21 after the plug-in cooperation of the first plug-in base 311 and the fixed end plate 21.

[0074] The circumferential contour of the limiting buckle 315 included in the first plug-in base 311 can be circular, polygonal, etc., and correspondingly, the limiting hole 212 on the fixed end plate 21 can be a circular hole, a polygonal hole, etc. For the case that the circumferential contour of the limiting buckle 315 is polygonal and the limiting hole 212 is a polygonal hole, it is convenient to avoid the rotation of the first plug-in base 311 relative to the fixed end plate 21 after the plug-in cooperation of the first plug-in base 311 and the fixed end plate 21. In addition, when the circumferential contour of the limiting buckle 315 is polygonal and the limiting hole 212 is a polygonal hole, the first plug-in base 311 can also only include the limiting buckle 315, and correspondingly, the fixed end plate 21 of the first battery module 20a only has the limiting hole 212 to realize the plug-in fixation of the first plug-in base 311 on the fixed end plate 21, while avoiding the rotation of the first plug-in base 311 relative to the fixed end plate 21.

[0075] The cooperation limiting of the limiting face 316 on the limiting buckle 315 in the limiting hole 212 can be that the hole wall of the limiting hole 212 has a stepped face facing the bottom of the lower cabinet 11, so that after the limiting buckle 315 extends into the limiting hole 212, the limiting of the limiting buckle 315 in the limiting hole 212 is realized through the cooperation of the limiting face 316 and the stepped face; or the fixed end plate 21 of the first battery module 20a can be a frame structure, and the limiting hole 212 has a limiting end face facing the bottom of the lower cabinet 11, so that after the limiting buckle 315 extends into the limiting hole 212 and the limiting face 316 extends out of the limiting hole 212, the limiting of the limiting buckle 315 in the limiting hole 212 is realized through the cooperation of the limiting face 316 and the limiting end face.

[0076] In some embodiments, as shown in FIG. 13, the limiting buckle 315 comprises a plurality of limiting columns 3151 distributed along the circumference of the limiting hole 212, each of the limiting columns 3151 has a protrusion 3153 on the outer surface 3152 away from the end of the first base 313; the protrusion 3153 has a first surface 3154 facing the first base 313, and the first surface 3154 forms the limiting surface 316.

[0077] In this way, when the limiting buckle 315 is implemented to limit the cooperation in the limiting hole 212, the protrusions 3153 on the plurality of limiting columns 3151 can be inwardly contracted under the action of an external force based on the gap between the two adjacent limiting columns 3151, so that the protrusions 3153 on the plurality of limiting columns 3151 can extend into the limiting hole 212, and then after the plurality of protrusions 3153 extend into the limiting hole 212, the limiting surface 316 on the protrusion 3153 can be implemented to limit the cooperation with the limiting hole 212 based on the elastic recovery of itself.

[0078] In the above, when the circumferential contour of the limiting buckle 315 is circular, the outer surface 3152 on each limiting column 3151 is an arc surface, and the arc radius of the outer surface 3152 is less than or equal to the hole diameter of the limiting hole 212, and in addition, the first surface 3154 on the protrusion 3153 facing the first base 313 is an arc surface; when the circumferential contour of the limiting buckle 315 is rectangular, the outer surface 3152 on each limiting column 3151 is a rectangular surface, and the width of the outer surface 3152 is less than or equal to the length of the corresponding hole edge of the limiting hole 212, and the first surface 3154 on the protrusion 3153 facing the first base 313 is a rectangular surface.

[0079] It should be noted that for the plurality of limiting columns 3151 distributed at intervals, in combination with the protrusion 3153 on each limiting column 3151 to form the limiting buckle 315, the plurality of limiting columns 3151 can also be an integral structure, and the adjacent two limiting columns 3151 have a spacing seam at the end away from the first base 313, so that the protrusions 3153 on the plurality of limiting columns 3151 can be inwardly contracted under the action of an external force.

[0080] Optionally, as shown in FIG. 13, the edge of the limiting surface 316 away from the limiting column 3151 is inclined away from the first base 313. In this way, while ensuring the cooperation of the limiting surface 316 and the limiting hole 212, the limiting surface 316 can play a guiding role when the first plug-in base 311 is disassembled, that is, the protrusions 3153 on the plurality of limiting columns 3151 can be inwardly contracted under the action of an external force based on the interaction between the limiting hole 212 and the limiting surface 316, and the plurality of limiting columns 3151 can be pulled out from the limiting hole 212.

[0081] In some embodiments, as shown in FIG. 13, the protrusion 3153 has a second surface 3155 facing away from the first base 313, and the second surface 3155 is inclined away from the edge of the limiting post 3151 towards the first base 313 to form a guide surface. In this way, the guide surface is formed by the second surface 3155 on the protrusion 3153 to facilitate the insertion of the plurality of limiting posts 3151 into the limiting hole 212, and to facilitate the mutual extrusion of the edge of the limiting hole 212 and the guide surface to cause the protrusion 3153 on the plurality of limiting posts 3151 to shrink inward, thereby facilitating the insertion of the plurality of limiting posts 3151 into the limiting hole 212 to realize the limiting of the limiting surface 316 and the limiting hole 212.

[0082] Optionally, in the direction away from the first base 313, the second surface 3155 on the protrusion 3153 protrudes beyond the end surface of the limiting protrusion 314, that is, the maximum distance between the second surface 3155 and the lower surface of the first base 313 is greater than the distance between the end surface of the limiting protrusion 314 and the lower surface of the first base 313, so that when the first insertion base 311 is assembled, the alignment of the limiting protrusion 314 and the limiting groove 211 is facilitated by the guide cooperation of the second surface 3155 and the limiting hole 212, thereby improving the insertion efficiency of the first insertion base 311 on the fixed end plate 21.

[0083] Further, the limiting hole 212 is a rectangular hole, and the limiting buckle 315 includes four limiting posts 3151 distributed along the four hole edges of the rectangular hole. In this way, when the second surface 3155 on the protrusion 3153 on the four limiting posts 3151 is guided and cooperated with the limiting hole 212, the rotation of the first insertion base 311 relative to the fixed end plate 21 is avoided, thereby directly realizing the alignment of the limiting protrusion 314 and the limiting groove 211, and further improving the insertion efficiency of the first insertion base 311 on the fixed end plate 21.

[0084] The application also provides a power utilization device 400, which includes the energy storage device 100 described in the above embodiments, and the energy storage device 100 supplies power to the power utilization device. In this way, in combination with the above description, the safety of the energy storage device 100 is improved on the basis of simplifying the connection between the battery monomer 22 and the battery management module 40, thereby facilitating the safety of the operation of the power utilization device.

[0085] In the embodiments of the present application, the terms "first", "second", "third" are only used for descriptive purpose and should not be understood as indicating or implying relative importance. The term "multiple" refers to two or more, unless otherwise explicitly limited. The terms "mount", "connect", "connection", "fix", and the like should be interpreted broadly, for example, "connection" can be fixed connection, or detachable connection, or integral connection; "connection" can be direct connection, or indirect connection through 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.

[0086] 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 used to facilitate the description of the embodiments of the present application and simplify the description, and do not indicate or imply that the device or unit referred to must have a particular direction, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the embodiments of the present application.

[0087] 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.

[0088] 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 should 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) fixedly 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 fixed end plates (21) arranged oppositely, a plurality of battery cells (22) located between the pair of fixed end plates (21), and an insulation plate (24) located between the fixed end plate (21) and the adjacent battery cell (22), the plurality of battery cells (22) being arranged along the length direction of the battery box (10), the plurality of battery modules (20) comprising a first battery module (20a) and a second battery module (20b) adjacent in the length direction of the battery box (10). A plurality of circuit boards (30) correspond to the plurality of battery modules (20) one-to-one, each circuit board (30) being arranged on the top of the corresponding battery module (20) and connected with the plurality of battery cells (22) of the corresponding battery module (20), the plurality of circuit boards (30) comprising a first circuit board (30a) and a second circuit board (30b) corresponding to the first battery module (20a) and the second battery module (20b) respectively. An end portion of the first circuit board (30a) has a first connector assembly (31) comprising a first plug-in base (311) and a first plug-in connector (312) fixedly connected, the first plug-in base (311) being fixed on the fixed end plate (21) of the first battery module (20a), an end portion of the second circuit board (30b) has a second plug-in connector (32) and a bending portion (33), the second plug-in connector (32) being connected with the first plug-in connector (312), the bending portion (33) being provided with a sheet-shaped insulation piece (34) toward the surface of the second battery module (20b), the orthographic projection of the insulation piece (34) on the second battery module (20b) having an overlapping area with the fixed end plate (21) and / or the insulation plate (24) of the second battery module (20b). An end portion of the first circuit board (30a) close to the first plug-in connector (312) is provided with a sheet-shaped buffer piece (35) toward the surface of the first battery module (20a), the buffer piece (35) being located in the area between the first circuit board (30a) and the insulation plate (24) of the first battery module (20a).

2. The energy storage device of claim 1, wherein, The first plug-in base (311) comprises a first base (313), a limiting protrusion (314) and a limiting buckle (315).

3. The energy storage device of claim 1 or 2, wherein, The limiting protrusion (314) and the limiting buckle (315) are located on the lower surface of the first base (313), and the limiting buckle (315) has a limiting surface (316) toward the first base (313). ​ The fixed end plate (21) of the first battery module (20a) is provided with a limiting slot (211) and a limiting hole (212), the limiting protrusion (314) is limited in the limiting slot (211), the limiting buckle (315) is located in the limiting hole (212), and the limiting surface (316) is matched with the limiting hole (212) for limiting.

4. The energy storage device of claim 3, wherein, The limiting buckle (315) comprises a plurality of limiting columns (3151) distributed along the circumference of the limiting hole (212), and each limiting column (3151) has a protrusion (3153) on the outer surface (3152) away from the end of the first base (313). The protrusion (3153) has a first surface (3154) facing the first base (313), and the first surface (3154) forms the limiting surface (316).

5. The energy storage device of claim 4, wherein, The edge of the limiting surface (316) away from the limiting column (3151) is inclined away from the first base (313).

6. The energy storage device of claim 4, wherein, The protrusion (3153) has a second surface (3155) facing away from the first base (313), and the second surface (3155) is inclined away from the limiting column (3151) edge towards the first base (313) to form a guide surface.

7. The energy storage device of claim 6, wherein, In the direction away from the first base (313), the second surface (3155) protrudes from the end surface of the limiting protrusion (314).

8. The energy storage device of claim 7, wherein, The limiting hole (212) is a rectangular hole, and the limiting buckle (315) comprises four limiting columns (3151) corresponding distributed along the four hole edges of the rectangular hole.

9. The energy storage device of claim 1, wherein, The circuit board (30) is a flexible circuit board.

10. An electrical device, comprising: The power-using equipment comprises the energy storage device (100) of any one of the preceding claims 1-9, and the energy storage device (100) supplies power for the power-using equipment.

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