Energy storage unit and electric device

Abstract

The present application relates to the technical field of energy storage. Disclosed are an energy storage unit and an electric device. The energy storage unit comprises: a battery case, wherein a cover of the battery case comprises a pair of side plates distributed in the direction of the width of the battery case; and a battery module located in a battery compartment of the battery case, wherein the distance between a first surface of each battery cell and each side plate increases in the direction towards the bottom of a lower case; and a first guide face is provided at an edge portion of a separator plate comprised in a first sub-battery module, and in the direction of the width of the battery case, at least part of the first guide face is located between a fixed end plate and the corresponding side plate.

Description

Energy storage device and electric equipment

[0001] Cross-reference to related applications

[0002] The present disclosure claims priority to Chinese Patent Application No. 202411126817.3, 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 electric equipment. BACKGROUND

[0004] The existing battery pack currently includes a battery box body and a battery module installed in the battery box body. In the context of the market pursuing high-capacity trends of battery packs, the battery pack is made larger and larger, i.e., the number of battery modules installed in the battery box body is more and more, thereby causing the volume and weight of the battery box body to be larger and larger. This causes the volume and weight of the cover included in the battery box body to also increase accordingly. When realizing the fixed connection of the cover and the lower box body, the cover with large volume and weight is prone to positional deviation, which reduces the assembly yield and assembly efficiency of the battery box body. SUMMARY

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

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

[0007] According to one aspect of the present application, an energy storage device is provided, comprising: a battery box body including a lower box body and a cover, the lower box body and the cover enclosing a battery compartment, and the cover including a pair of side plates distributed along the width direction of the battery box body; a battery module located in the battery compartment, and the battery module including a plurality of fixed end plates, a plurality of battery monomers located between the plurality of fixed end plates, and a separation plate covering the top surface of the plurality of battery monomers, in the width direction of the battery box body, the distance between the first surface of the battery monomer close to the side plate and the side plate increases in the direction from the top of the cover towards the bottom of the lower box body; wherein the battery module includes a first sub-battery module adjacent to the side plate, the separation plate included in the first sub-battery module has an edge portion close to the side plate, the edge portion is provided with a first guide surface, and at least part of the first guide surface is located between the fixed end plate and the side plate in the width direction of the battery box body.

[0008] In the embodiment of the present application, the inclination of the side plate included in the box cover to the outside is realized, so that the box cover has a larger opening size in the width direction of the battery box body; in addition, for the first battery module adjacent to the side plate in the battery module, the edge part on the isolation plate is provided with a first guide surface; in this way, when the box cover and the lower box body are assembled, the alignment assembly of the box cover and the lower box body in the width direction of the battery box body can be realized based on the larger opening size of the box cover in the width direction and the guide cooperation of the side plate of the box cover and the first guide surface, so as to improve the assembly yield and assembly efficiency of the battery box body.

[0009] According to an aspect of the present application, a power utilization device is provided, which comprises the energy storage device of the above-mentioned aspect, and the energy storage device supplies power to the power utilization 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 through a detailed description of example embodiments thereof, 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 exploded structural schematic diagram of a battery module according to an example embodiment.

[0015] FIG. 4 is a top view structural schematic diagram of an energy storage device according to an example embodiment.

[0016] FIG. 5 is a sectional structural schematic diagram of the energy storage device shown in FIG. 4 along the A-A' direction.

[0017] FIG. 6 is a partial enlarged structural schematic diagram of the sectional view shown in FIG. 5.

[0018] FIG. 7 is a sectional view of the energy storage device shown in FIG. 4 along the B-B' direction.

[0019] FIG. 8 is a partial enlarged structural schematic diagram of the sectional view shown in FIG. 7.

[0020] FIG. 9 is a rear view structural schematic diagram of a battery module according to an example embodiment.

[0021] FIG. 10 is a partial enlarged structural schematic diagram of the rear view of the battery module shown in FIG. 9.

[0022] FIG. 11 is a side view structural schematic diagram of a battery module according to an exemplary embodiment.

[0023] FIG. 12 is a partial enlarged structural schematic diagram of the side view of the battery module shown in FIG. 11.

[0024] FIG. 13 is a partial enlarged structural schematic diagram of the exploded view of the battery module shown in FIG. 3.

[0025] FIG. 14 is an axial side view exploded structural schematic diagram of a battery box according to an exemplary embodiment.

[0026] FIG. 15 is a top view structural schematic diagram of a battery box according to an exemplary embodiment.

[0027] FIG. 16 is an exploded structural schematic diagram of a lower box according to an exemplary embodiment.

[0028] In the drawings: 100, energy storage device; 200, electric energy conversion device; 300, user load; 10, battery box; 20, battery module; 30, cross-connection tab; 11, lower box; 12, box cover; 13, liquid cooling plate; 14, thermal insulation cotton; 15, heat-conducting plate; 111, bottom plate; 112, frame; 113, rolling mechanism; 114, roller; 1111, first partition; 1112, second partition; 1121, front end plate; 1122, rear end plate; 1123, side end plate; 1124, outer side surface; 1125, convex beam; 1126, fork hole; 1127, suspension hole; 121, cover plate; 122, side plate; 123, back plate; 20a, first sub-battery module; 20b, second sub-battery module; 21, fixed end plate; 22, battery monomer; 23, isolation plate; 24, limiting plate; 25, cable tie; 26, connecting tab; 27, fixed bolt; 28, exposed end; 221, first surface; 222, second surface; 231, edge portion; 232, first guide surface; 233, first extension surface; 234, limiting groove; 235, through hole; 236, recess; 237, limiting column; 261, welding area; 262, curved portion; 263, limiting hole; 31, connection end portion; 32, cross-connection portion; 33, bent portion; 34, second guide surface; 35, second extension surface. DETAILED DESCRIPTION

[0029] Example embodiments now will be described more fully hereinafter with reference to the accompanying drawings; however, these embodiments should not be construed as limiting all example embodiments. Rather, these embodiments 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.

[0030] Since the energy required by people has strong time and space, in order to reasonably use energy and improve the utilization rate, it is necessary to store the energy in the form of one energy form or converted into another energy form through a medium or device, and then release it in a specific energy form based on future application.

[0031] 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 power consumption, and too much electricity at low power consumption), and 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.

[0032] 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, the electrical energy is converted into other forms of energy by physical or chemical means for storage, and the energy stored in the energy storage device is converted into electrical energy for release when needed. Simply put, the energy storage device is similar to a large "power bank", which stores electrical energy when light energy and wind energy are sufficient, and releases the stored electrical energy when needed.

[0033] 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:

[0034] (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 supply in power grid, realize load matching of electrical 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;

[0035] (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". Since there is a large price difference in electricity charges at peak and valley positions according to electricity demand, users usually charge the energy storage device (energy storage cabinet / box) during the low electricity price period in order to reduce costs; during the high electricity price period, the electricity in the energy storage device is discharged for use, in order to achieve the purpose of saving electricity charges. 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 providing backup power for the user and the power grid, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0036] Taking an outdoor energy storage scenario in a grid-side energy storage as an example, FIG. 1 shows a schematic diagram of an energy storage system provided by an 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 a peak time of electricity price or when the power grid is powered off.

[0037] In combination with the above-mentioned energy storage by physical or electrochemical means, 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 an energy storage medium to realize the charging and discharging process through chemical reactions or changes 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 reactions or changes of the energy storage medium, and then released and used by the chemical reactions or changes of the energy storage medium when the use of external electric energy reaches a peak, or transferred to a place where electric energy is in short supply for use.

[0038] The energy storage device 100 provided by an embodiment of the present application can be a battery pack, a battery box, a battery system, etc. composed of battery monomers 22. The battery monomers 22 can be lithium ion secondary batteries, lithium-sulfur batteries, sodium lithium ion batteries, sodium ion batteries, magnesium ion batteries, etc., and can be in the form of a cylinder, a flat body, a cuboid, etc., which is not limited in the present application.

[0039] In some embodiments, as shown in FIG. 2, the energy storage device 100 includes a battery box body 10 and a battery module 20. The battery box body 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 battery module 20 is located in the battery compartment.

[0040] The number of sub-battery modules included in the battery module 20 accommodated in the battery compartment of the battery box body 10 can be 2, 4, 6, 8, etc., and the more the number of sub-battery modules included in the battery module 20, the higher the capacity of the energy storage device 100, thereby more easily meeting market demand. For example, as shown in FIG. 2, the battery compartment of the battery box body 10 accommodates 2 rows along the length direction Y of the battery box body 10 and 4 columns of sub-battery modules along the width direction X of the battery box body 10, i.e., the battery module 20 accommodated in the battery compartment includes 8 sub-battery modules.

[0041] As shown in FIG. 3, the battery module 20 includes a plurality of fixed end plates 21 and a plurality of battery cells 22 located between the plurality of fixed end plates 21. That is, taking a sub-battery module as an example, the sub-battery module includes a pair of fixed end plates 21 and a plurality of battery cells 22 located between the pair of fixed end plates 21.

[0042] Among them, the plurality of battery cells 22 and the pair of fixed end plates 21 can be fixed by a binding tool such as a cable tie 25, and the plurality of battery cells 22 are arranged along the length direction Y of the battery box 10. The relationship between the plurality of battery cells 22 can be in series or in series-parallel. For example, the plurality of battery cells 22 are connected in parallel and then connected in series to increase the output current of the battery module 20.

[0043] Optionally, the outer wall of each battery cell 22 is covered with an insulating blue film to avoid safety hazards caused by shell leakage of the battery cell 22. Since the fixed end plate 21 is usually made of aluminum, an insulating member can be provided between the fixed end plate 21 and the adjacent battery cell 22 to prevent the burr on the fixed end plate 21 from piercing the insulating blue film on the battery cell 22, and to prevent the battery cell 22 from being electrified after leakage.

[0044] In addition, as shown in FIG. 3, the battery module 20 includes an isolation plate 23 covering the top surface of the plurality of battery cells 22, a connecting tab 26 provided on the isolation plate 23, and a transmission line (not shown in the figure) fixed on the isolation plate 23.

[0045] Among them, the isolation plate 23 can be a plate-shaped structure made of insulating materials such as plastic plates to effectively isolate the battery cells 22 and the connecting tab 26; the connecting tab 26 can be an aluminum connecting tab, and is connected to the electrode terminal of the battery cell 22 based on the through hole 235 on the isolation plate 23 to realize series-parallel connection between the plurality of battery cells 22; the transmission line can be a wire harness or a fpc flexible circuit board, one end of the transmission line is connected to the connecting tab 26, and the other end is connected to the battery management module to effectively collect the state parameters of the battery cells 22.

[0046] In the related art, with the demand for high capacity, the volume and weight of the battery box 10 are increasing, which causes the volume and weight of the cover 12 included in the battery box 10 to also increase accordingly, and thus when realizing the fixed connection between the cover 12 and the lower box 11, the cover 12 with large volume and weight is prone to have deviation in alignment, which reduces the assembly efficiency of the battery box 10.

[0047] To solve the technical problem, the application provides an energy storage device 100. As shown in FIG. 4, FIG. 5 and FIG. 6, the cover 12 of the battery box 10 includes a pair of side plates 122 distributed along the width direction X of the battery box 10. In the width direction X of the battery box 10, the distance L1 between the first surface 221 of the battery monomer 22 close to the side plate 122 and the side plate 122 increases in the direction from the top of the cover 12 to the bottom of the lower box 11 (i.e. the direction from the cover plate 121 included in the cover 12 to the bottom plate 111 included in the lower box 11). The first sub-battery module 20a close to the side plate 122 is included in the battery module 20. The isolation plate 23 included in the first sub-battery module 20a has an edge portion 231 close to the side plate 122. The edge portion 231 is provided with a first guide surface 232. At least part of the first guide surface 232 is located between the fixed end plate 21 and the side plate 122 in the width direction X of the battery box 10.

[0048] In the application, the distance L1 between the first surface 221 of the battery monomer 22 close to the side plate 122 and the side plate 122 increases in the direction from the top of the cover 12 to the bottom of the lower box 11 in the width direction X of the battery box 10. The side plate 122 included in the cover 12 is inclined outward, so that the cover 12 has a larger opening size in the width direction X of the battery box 10. Furthermore, for the first sub-battery module 20a close to the side plate 122 in the battery module 20, the edge portion 231 on the isolation plate 23 is provided with the first guide surface 232. Thus, when the cover 12 and the lower box 11 are assembled, the larger opening size of the cover 12 in the width direction of the battery box 10 and the guide cooperation between the side plate 122 of the cover 12 and the first guide surface 232 can realize the alignment and assembly of the cover 12 and the lower box 11 in the width direction X of the battery box 10 faster, thereby improving the assembly yield and assembly efficiency of the battery box 10.

[0049] In the application, the distance L1 between the first surface 221 of the battery monomer 22 close to the side plate 122 and the side plate 122 increases in the direction from the top of the cover 12 to the bottom of the lower box 11 in the width direction X of the battery box 10. The side plate 122 included in the cover 12 is inclined outward, so that the cover 12 has a larger opening size in the width direction X of the battery box 10. Furthermore, for the first sub-battery module 20a close to the side plate 122 in the battery module 20, the edge portion 231 on the isolation plate 23 is provided with the first guide surface 232. Thus, when the cover 12 and the lower box 11 are assembled, the larger opening size of the cover 12 in the width direction of the battery box 10 and the guide cooperation between the side plate 122 of the cover 12 and the first guide surface 232 can realize the alignment and assembly of the cover 12 and the lower box 11 in the width direction X of the battery box 10 faster, thereby improving the assembly yield and assembly efficiency of the battery box 10.

[0050] In some embodiments, as shown in FIG. 3, the isolation plate 23 has a pair of edge portions 231 in the width direction X of the battery box 10, and a pair of limiting plates 24 connected with the pair of edge portions 231 respectively and bent towards the direction close to the bottom of the lower box 11.

[0051] In this way, when the isolation plate 23 is placed on the plurality of battery monomers 22, the limiting of the isolation plate 23 in the width direction X of the battery box 10 is achieved by the cooperation of the pair of limiting plates 24 and the battery monomers 22, so as to avoid the displacement of the isolation plate 23. In addition, by the provision of the pair of limiting plates 24, the protection of the insulating blue film on the battery monomers 22 is also achieved, so as to avoid the contact between the side plate 122 and the battery monomers 22 included in the first sub-battery module 20a when the box cover 12 is assembled, thereby avoiding the abrasion of the insulating blue film on the battery monomers 22 and ensuring the overall insulation effect of the first sub-battery module 20a.

[0052] Among them, the surface of the limiting plate 24 towards the side plate 122 and the first guide surface 232 on the edge portion 231 are an integral extension surface.

[0053] Optionally, as shown in FIG. 6, in the width direction X of the battery box 10, the limiting plate 24 has a gap S with the first surface 221 of the battery monomer 22.

[0054] In this way, by the provision of the gap S, sufficient buffer space is formed between the first guide surface 232 and the battery monomer 22, so that in the process of guiding the side plate 122 by the first guide surface 232 to realize the covering of the box cover 12 and the lower box 11, the first guide surface 232 can be elastically deformed towards the direction close to the battery monomer 22 after being pressed by the side plate 122, so as to avoid the hard contact between the first guide surface 232 and the side plate 122, and further avoid the breakage of the isolation plate 23 at the first guide surface 232 due to the large force on the first guide surface 232, and avoid the hard friction between the first guide surface 232 and the inner wall of the side plate 122, so as to avoid the damage or even falling off of the mica fireproof layer on the inner wall of the side plate 122.

[0055] Optionally, the gap S between the limiting plate 24 and the first surface 221 of the battery monomer 22 can be greater than or equal to 2 mm and less than or equal to 8 mm. For example, the gap S between the limiting plate 24 and the first surface 221 of the battery monomer 22 is 2 mm, 4 mm, 6 mm, 8 mm, etc.

[0056] In some embodiments, the two end faces of the isolation plate 23 in the length direction Y of the battery box 10 have limiting structures such as limiting columns, and correspondingly, one side of the two fixed end plates 21 towards the battery monomers 22 has clamping structures such as clamping holes, and the limiting structures and the clamping structures realize detachable clamping limiting.

[0057] Therefore, when the pair of fixed end plates 21 and the plurality of battery monomers 22 are bundled by the bundling tool such as the cable tie 25, the isolation plate 23 can be arranged on the plurality of battery monomers 22 in advance, so that the end of the isolation plate 23 is clamped and limited by the fixed end plate 21 at the same time when the plurality of battery monomers 22 are bundled, thereby avoiding the displacement of the isolation plate 23 in the width direction X and the length direction Y of the battery box 10, and ensuring the accuracy of the alignment between the connecting tab 26 and the electrode terminal on the battery monomer 22 when the connecting tab 26 is arranged subsequently, and further ensuring the welding yield of the connecting tab 26 and the battery monomer 22.

[0058] In combination with the above, in the case where the insulating member is arranged between the fixed end plate 21 and the battery monomer 22 adjacent to the fixed end plate 21, the end of the isolation plate 23 close to the fixed end plate 21 can directly cover the insulating member, so as to avoid the interference of the insulating member with the clamping and limiting between the isolation plate 23 and the fixed end plate 21.

[0059] In some embodiments, as shown in FIGS. 7 and 8, the box cover 12 includes a back plate 123 connected with a pair of side plates 122, and the distance L2 between the second surface 222 of the battery monomer 22 close to the back plate 123 and the back plate 123 in the length direction Y of the battery box 10 increases in the direction from the top of the box cover 12 to the bottom of the lower box 11 (i.e., the direction from the cover plate 121 included in the box cover 12 to the bottom plate 111 included in the lower box 11); the battery module 20 includes a second sub-battery module 20b adjacent to the back plate 123, and the energy storage device 100 includes a cross-connection tab 30, the cross-connection tab 30 includes a connection end 31, a cross-connection portion 32 and a bending portion 33, the connection end 31 is connected with the second sub-battery module 20b, the cross-connection portion 32 is located between the second sub-battery module 20b and the back plate 123, the bending portion 33 connects the connection end 31 and the cross-connection portion 32, and the bending portion 33 is provided with a second guide surface 34.

[0060] Since the distance L2 between the second surface 222 of the battery monomer 22 and the back plate 123 in the length direction Y of the battery box 10 increases in the direction from the top of the box cover 12 to the bottom of the lower box 11, the inclination of the back plate 123 included in the box cover 12 to the outside is realized, so that the box cover 12 has a larger opening size in the length direction Y of the battery box 10; furthermore, for the cross-connection tab 30 between the second sub-battery module 20b and the back plate 123, the bending portion 33 is provided with the second guide surface 34; thus, when the box cover 12 and the lower box 11 are assembled, the alignment and assembly of the box cover 12 and the lower box 11 in the length direction Y can be realized based on the larger opening size of the box cover 12 in the length direction Y and the guide cooperation between the back plate 123 of the box cover 12 and the second guide surface 34, thereby further improving the assembly yield and efficiency of the battery box 10.

[0061] The second guide surface 34 can be a flat inclined surface or a circular arc transition surface as shown in FIG. 8. When the second guide surface 34 is a circular arc transition surface, the contact area with the back plate 123 is reduced, the friction between the second guide surface 34 and the back plate 123 is reduced, and the abrasion of the mica fireproof layer on the inner wall of the back plate 123 is reduced.

[0062] The cross-connection piece 30 can be a cross-connection copper bar, and as shown in FIG. 9, the cross-connection piece 30 has two connection end portions 31 and two bent portions 33. The two connection end portions 31 are connected to the two ends of the cross-connection portion 32 through the two bent portions 33, respectively, and are connected to the two second sub-battery modules 20b, respectively, to realize the connection between different battery modules 20. The two bent portions 33 each have a second guide surface 34 that cooperates with the back plate 123 to ensure the guiding effect on the back plate 123.

[0063] The connection end portion 31 of the cross-connection piece 30 is directly connected to the battery monomer 22 of the second sub-battery module 20b, and thus the surface of the connection end portion 31 can not be treated. The surface of the bent portion 33 of the cross-connection piece 30 can not be treated, or an insulating film layer (such as an insulating tape or an insulating coating) can be arranged on the surface of the bent portion 33 to insulate and isolate the cross-connection piece 30 from the box cover 12 and avoid the risk of electrification of the box cover 12. The surface of the cross-connection portion 32 of the cross-connection piece 30 can not be treated, or an insulating film layer can be arranged on the surface of the cross-connection portion 32 to simplify the arrangement of the insulating film layer on the bent portion 33 of the cross-connection piece 30.

[0064] In some embodiments, as shown in FIGS. 9 and 10, the battery module 20 includes a fixing bolt 27 that passes through the fixed end plate 21 and is detachably fixedly connected to the bottom of the lower box body 11 (not shown in the figure). The fixing bolt 27 has an exposed end 28 exposed on the side of the fixed end plate 21 away from the bottom of the lower box body 11.

[0065] For the fixing bolt 27 having the exposed end 28, in combination with the above-mentioned outward inclination of the side plate 122 of the box cover 12, as shown in FIGS. 9 and 10, the exposed end 28 of the fixing bolt 27 on the first sub-battery module 20a can be located on the side of the first extension surface 233 away from the side plate 122 (not shown in the figure). The first extension surface 233 is a curved surface obtained by extending the first guide surface 232 along the length direction Y of the battery box body 10.

[0066] Thus, by limiting the relative position of the exposed end 28 of the fixing bolt 27 on the first sub-battery module 20a and the first extension surface 233, when the box cover 12 is assembled, under the guiding effect of the first guide surface 232 on the side plate 122, the rubbing between the fixing bolt 27 on the first sub-battery module 20a and the inner wall of the side plate 122 is avoided, and the damage to the mica fireproof layer provided on the inner wall of the side plate 122 is avoided.

[0067] For example, the distance between the exposed end 28 of the first sub-battery module 20a close to the side plate 122 and the cover plate 121 is greater than the maximum distance between the first guide surface 232 and the cover plate 121, and the distance between the exposed end 28 of the fixing bolt 27 on the first sub-battery module 20a and the side plate 122 is greater than the maximum distance between the first guide surface 232 and the side plate 122.

[0068] In combination with the above-mentioned outward inclination of the back plate 123 of the box body, as shown in FIGS. 11 and 12, the exposed end 28 of the fixing bolt 27 on the second sub-battery module 20b can be located on the side of the second extension surface 35 away from the back plate 123 (not shown in the figure), and the second extension surface 35 is a curved surface after the second guide surface 34 extends along the width direction X of the battery box body 10.

[0069] Thus, by limiting the relative position of the exposed end 28 of the fixing bolt 27 on the second sub-battery module 20b and the second extension surface 35, when the box cover 12 is assembled, under the guiding effect of the second guide surface 34 on the back plate 123, the rubbing between the fixing bolt 27 on the second sub-battery module 20b and the inner wall of the back plate 123 is avoided, and the damage to the mica fireproof layer provided on the inner wall of the back plate 123 is avoided.

[0070] For example, the distance between the exposed end 28 of the second sub-battery module 20b close to the back plate 123 and the cover plate 121 is greater than the maximum distance between the second guide surface 34 and the cover plate 121, and the distance between the exposed end 28 of the second sub-battery module 20b close to the back plate 123 and the back plate 123 is greater than the maximum distance between the second guide surface 34 and the back plate 123.

[0071] In some embodiments, for the case that the battery module 20 includes multiple connecting tabs 26, as shown in FIG. 3 and FIG. 13, the isolation plate 23 away from the surface of the battery monomer 22 has multiple limiting grooves 234 corresponding to the multiple connecting tabs 26, the groove bottom of each limiting groove 234 has multiple through holes 235 penetrating the isolation plate 23, and each through hole 235 respectively exposes an electrode terminal of a different battery monomer 22; each connecting tab 26 has multiple welding areas 261 corresponding to the multiple through holes 235 in the corresponding limiting groove 234, the connecting tab 26 is limited in the corresponding limiting groove 234, and each welding area 261 is fixedly connected with the electrode terminal of a battery monomer 22 in the area of the corresponding through hole 235.

[0072] In this way, based on the limiting grooves 234 on the isolation plate 23, the limiting of the corresponding connecting tab 26 can be realized to avoid the displacement of the connecting tab 26 before the fixed connection of the connecting tab 26 and the electrode terminal of the battery monomer 22, which affects the connection yield of the connecting tab 26 and the battery monomer 22, that is, to ensure the contact area of the connecting tab 26 and the electrode terminal on the battery monomer 22 to ensure sufficient overcurrent capacity.

[0073] Among them, the circumferential profile of the limiting groove 234 matches the circumferential profile of the connecting tab 26 to ensure that the groove wall of the limiting groove 234 can limit the connecting tab 26 in the width direction X and the length direction Y of the battery box body 10. In addition, the groove wall of the limiting groove 234 can have a notch to facilitate the fixed connection of the transmission line and the connecting tab 26 as described above.

[0074] Among them, the number of through holes 235 in the limiting groove 234 can be two, three, four, etc. When the limiting groove 234 has two through holes 235, the corresponding connecting tab 26 has two welding areas 261, and the two welding areas 261 are respectively connected with the electrode terminals of different polarities on two battery monomers 22 through the two through holes 235 in the limiting groove 234 (such as penetration welding, etc.), to realize the series connection of multiple battery monomers 22; when the limiting groove 234 has four through holes 235, the corresponding connecting tab 26 has four welding areas 261, and the four welding areas 261 are respectively connected with the first electrode terminals of the same polarity on two battery monomers 22 among the four battery monomers 22 and the second electrode terminals of the same polarity on the other two battery monomers 22 among the four battery monomers 22 (the polarities of the first electrode terminals and the second electrode terminals are different), to realize the series connection of the two-by-two parallel connection of multiple battery monomers 22.

[0075] In some embodiments, as shown in FIG. 13, for the connecting tab 26 including a plurality of welding areas 261, the connecting tab 26 has an arc-shaped bending part 262 between any two adjacent welding areas 261. In this way, a tensile allowance can be formed between the two adjacent welding areas 261, so as to avoid the pulling of the connecting tab 26 caused by the expansion of the battery cell 22 due to charging and discharging, so as to avoid the loosening or even falling off of the welding areas 261 and the electrode terminals of the battery cell 22.

[0076] In some embodiments, as shown in FIG. 13, the bottom of the limiting groove 234 has a limiting column 237, and the connecting tab 26 has a limiting hole 263 which is sleeved on the limiting column 237. In this way, by matching the limiting hole 263 on the connecting tab 26 with the limiting column 237 at the bottom of the limiting groove 234, the limiting of the connecting tab 26 in the height direction of the battery box 10 can be realized based on the friction between the hole wall of the limiting hole 263 and the limiting column 237, so as to further avoid the displacement of the connecting tab 26 before fixing the connecting tab 26 and the electrode terminals of the battery cell 22, and to affect the welding yield of the connecting tab 26 and the battery cell 22.

[0077] Optionally, the limiting column 237 at the bottom of the limiting groove 234 is a hot melt column, and the limiting column 237 has a cap part which is arranged on the upper surface of the connecting tab 26, and the cross section of the limiting column 237 parallel to the height direction of the battery box 10 is T-shaped.

[0078] For example, the limiting column 237 is a plastic hot melt column which is integrally formed with the isolation plate 23, so that after the limiting hole 263 on the connecting tab 26 is sleeved on the limiting column 237, the screw-like structure of the limiting column 237 with the cap part can be realized by heating the end part of the limiting column 237, i.e. the cross section of the limiting column 237 parallel to the height direction of the battery box 10 is T-shaped, so as to stably limit the connecting tab 26 in the height direction of the battery box 10, avoid the warping of the connecting tab 26, and further ensure the welding yield of the welding areas 261 on the connecting tab 26 and the electrode terminals of the battery cell 22.

[0079] In some embodiments, as shown in FIG. 13, the groove wall of the limiting groove 234 has a recess 236 which extends to the bottom of the limiting groove 234.

[0080] In this way, when the connecting tab 26 is placed in the limiting groove 234, the micro-pressure cavity formed by the connecting tab 26 and the bottom and groove wall of the limiting groove 234 can form an exhaust passage through the recess 236 on the groove wall, so as to avoid the gas in the micro-pressure cavity from hindering the lowering of the connecting tab 26, and to ensure that the connecting tab 26 can directly abut against the bottom of the limiting groove 234, and further ensure the welding yield of the connecting tab 26 and the electrode terminals of the battery cell 22.

[0081] The recess 236 can be a semicircular recess 236 in the depth direction of the limiting groove 234, or a rectangular recess 236, etc., as long as it can form an exhaust passage. The groove wall of the limiting groove 234 can have a plurality of recesses 236 distributed at intervals, so as to accelerate the discharge rate of the gas in the micro-pressure cavity formed by the groove bottom and the groove wall of the limiting groove 234 and the connecting tab 26, thereby accelerating the placement efficiency of the connecting tab 26.

[0082] Optionally, the circumferential profile of the limiting groove 234 is rectangular, and the two opposite groove walls of the limiting groove 234 each have a recess 236. For example, the two groove walls of the limiting groove 234 distributed along the width direction X of the battery box 10 each have a recess 236; or the two groove walls of the limiting groove 234 distributed along the length direction Y of the battery box 10 each have a recess 236; or the two groove walls of the limiting groove 234 distributed along the length direction Y of the battery box 10 and the two groove walls distributed along the width direction X of the battery box 10 each have a recess 236.

[0083] In this way, by arranging the recess 236 on the two opposite groove walls of the limiting groove 234, a grabbing position for the connecting tab 26 is formed on the groove wall of the limiting groove 234, thereby facilitating the removal of the unqualified connecting tab 26 from the limiting groove 234, or the disassembly of the damaged connecting tab 26 from the limiting groove 234, so as to improve the removal efficiency of the connecting tab 26.

[0084] In some embodiments, the pair of opposite outer walls (i.e., the pair of outer walls along the width direction X of the battery box 10) of the lower box 11 each have a hanging structure and a forklift cavity extending along the length direction Y of the battery box 10.

[0085] In this way, for the battery box 10 with a large volume, after accommodating a plurality of battery modules 20, the stable transportation of the battery box 10 can be realized by a designated transportation tool such as a forklift based on the hanging structure and the forklift cavity, i.e., the forklift cavity is used to fork and lift the battery box 10, the hanging structure is used to stably tighten the battery box 10, and the battery box 10 is directly transported to a mounting rack, thereby reducing the transportation difficulty of the battery box 10 and improving the transportation efficiency of the battery box 10.

[0086] The planes where the pair of outer side walls of the lower box body 11 are located are parallel to the length direction Y of the battery box body 10, so as to ensure that the length direction Y of the forklift cavities on the pair of outer side walls of the lower box body 11 is parallel to the length direction Y of the battery box body 10. Of course, the length direction Y of the forklift cavities on the pair of outer side walls of the lower box body 11 can also have a certain angle with the length direction Y of the battery box body 10, as long as the length direction Y of the forklift cavities on the pair of outer side walls is parallel, and the designated transport tool can be based on the forklift cavities to fork and lift the battery box body 10.

[0087] In some embodiments, as shown in FIG. 14, the lower box body 11 includes a bottom plate 111 and a frame 112 surrounding the edge of the bottom plate 111, and the box cover 12 is fixedly connected with the frame 112.

[0088] As shown in FIG. 14, the frame 112 includes a front end plate 1121, a rear end plate 1122, and a pair of side end plates 1123, the front end plate 1121 and the rear end plate 1122 are opposite and parallel in the length direction Y of the battery box body 10, and the pair of side end plates 1123 are opposite and parallel in the width direction X of the battery box body 10.

[0089] As shown in FIG. 15, the bottom of the lower box body 11 is provided with a first partition 1111, and the length direction of the first partition 1111 is parallel to the width direction X of the battery box body 10, so as to separate the battery compartment in the battery box body 10 through the cooperation of the first partition 1111 and the rear end plate 1122, and at the same time realize the limiting of the battery module 20 in the battery compartment, so as to avoid the interference between the battery module 20 and the electrical components (such as battery management module, etc.) fixed on the front end plate 1121.

[0090] As shown in FIG. 15, the bottom of the lower box body 11 is further provided with a second partition 1112 distributed side by side with the first partition 1111, so as to separate the battery compartment into a plurality of sub-compartments distributed along the length direction Y of the battery box body 10 through the second partition 1112, thereby facilitating the arrangement of a plurality of rows of battery modules 20 in the plurality of sub-compartments, so as to realize the assembly of a plurality of rows and a plurality of columns of battery modules 20 in the battery compartment, thereby realizing the high-capacity effect of the energy storage device 100.

[0091] In combination with the specific structure of the lower box body 11, the suspension structure and the forklift cavity provided on the outer side wall of the lower box body 11 can be that the two edge portions 231 of the bottom plate 111 close to the pair of side end plates 1123 are provided with the suspension structure and the forklift cavity; or the outer side surfaces 1124 of the pair of side end plates 1123 are provided with the suspension structure and the forklift cavity; or the two edge portions 231 of the bottom plate 111 close to the pair of side end plates 1123 are provided with one of the suspension structure and the forklift cavity, and the outer side surfaces 1124 of the pair of side end plates 1123 are provided with the other one of the suspension structure and the forklift cavity.

[0092] When the bottom plate 111 is arranged close to the edge portion 231 of the side end plate 1123 with the suspension structure and / or the forking cavity, in order not to affect the fixed connection of the bottom plate 111 and the side end plate 1123, the side end plate 1123 can be supported on the upper surface of the bottom plate 111 to ensure that the suspension structure and / or the forking cavity on the bottom plate 111 protrude from the side end plate 1123, thereby facilitating the forking lifting and suspension tensioning of the battery box 10. When the suspension structure and the forking cavity are both arranged on the outer side surface 1124 of the side end plate 1123, the suspension structure and the forking cavity can be arranged on the two side edge portions 231 of the side end plate 1123 along the height direction of the battery box 10, or the suspension structure and the forking cavity can be arranged on the same side edge portion 231 of the side end plate 1123 along the height direction of the battery box 10.

[0093] For example, the suspension structure and the forking cavity are arranged on the outer side surface 1124 of the side end plate 1123 and located on the side of the side end plate 1123 close to the bottom plate 111 along the height direction of the battery box 10. For the suspension structure and the forking cavity arranged on the side end plate 1123, the collision between the designated transport tool and the electrical devices (battery management module, electrode connector) on the battery box 10 can be avoided during the transfer of the battery box 10, and the structural integrity of the battery box 10 during the transfer process can be ensured.

[0094] Next, the suspension structure and the forking cavity are both located on the outer side surface 1124 of the side end plate 1123 are taken as an example for detailed explanation.

[0095] In some embodiments, as shown in FIG. 14, the outer side surface 1124 of the side end plate 1123 is provided with a convex beam 1125, the length direction Y of the convex beam 1125 is parallel to the length direction Y of the battery box 10, and the convex beam 1125 has at least one open forking hole 1126, and the forking hole 1126 surrounds the forking cavity.

[0096] In this way, for the convex beam 1125 on the outer side surface 1124 of the side end plate 1123, the structural strength of the side end plate 1123 can be enhanced based on the convex beam 1125 to ensure the structural stability of the lower box 11 based on the forking hole 1126 to achieve the forking lifting of the lower box 11. In addition, since the forking cavity is surrounded by the forking hole 1126, the stability of the forking lifting is ensured when the lower box 11 is forking lifted, and the risk of the lower box 11 falling during the transfer process is avoided.

[0097] The convex beam 1125 arranged on the outer side surface 1124 of the side end plate 1123 can be fixed on the outer side surface 1124 of the side end plate 1123 by welding, or the side end plate 1123 and the convex beam 1125 can be in an integrated structure (for example, an integrated extruded aluminum profile). For the integrated structure of the side end plate 1123 and the convex beam 1125, the connection strength between the convex beam 1125 and the side end plate 1123 can be ensured, so that when the lower box 11 is forked and lifted by the fork holes 1126 on the convex beam 1125, the risk of breaking the convex beam 1125 and the side end plate 1123 can be avoided.

[0098] Optionally, as shown in FIG. 14, the convex beam 1125 further has a hole wall penetrating the fork hole 1126, and a plurality of suspension holes 1127 spaced apart and arranged to form a suspension structure. In this way, the plurality of suspension holes 1127 are arranged based on the fork hole 1126 while the fork hole 1126 is arranged on the convex beam 1125, so as to simplify the structure of the lower box 11.

[0099] It should be noted that, in addition to arranging the convex beam 1125 on the outer side surface 1124 of the side end plate 1123 to form the forked cavity on the convex beam 1125, the forked cavity can also be directly formed on the edge portion 231 of the side end plate 1123 close to the bottom plate 111. For example, the edge portion 231 of the side end plate 1123 close to the bottom plate 111 has a rectangular chamfer, and the forked cavity is surrounded by the chamfer surface of the rectangular chamfer. In addition, in addition to arranging the suspension holes 1127 on the convex beam 1125 to form the suspension structure, the convex column can also be arranged on the outer side surface 1124 of the side end plate 1123 to form the suspension structure, and the like, which is not limited in the embodiments of the present application.

[0100] In some embodiments, as shown in FIG. 14, the bottom of the lower box 11 is provided with two groups of rolling mechanisms 113, and each group of rolling mechanisms 113 includes a plurality of rollers 114 spaced apart along the length direction Y of the battery box 10.

[0101] In this way, by arranging the two groups of rolling mechanisms 113 on the bottom of the lower box 11, the movement of the lower box 11 can be facilitated when the lower box 11 is forked and lifted by the designated transport tool, so as to improve the efficiency of the forked lifting. In addition, when the lower box 11 is transported to the position of the mounting rack and pushed to support the lower box 11 on the mounting rack, the friction between the bottom of the lower box 11 and the mounting rack can be reduced based on the contact between the rollers 114 and the mounting rack, so as to prolong the service life of the lower box 11, and also reduce the resistance when the lower box 11 is pushed in, so as to facilitate the assembly efficiency and convenience of the lower box 11 on the mounting rack.

[0102] In combination with the specific structure of the lower box body 11 described above, the two groups of rolling mechanisms 113 can be arranged on the lower surface of the bottom plate 111 or on the edge portion 231 of the first opening end of the frame 112. For example, in the case where the edge portion 231 of the side end plate 1123 of the frame 112 is provided with a convex beam 1125 as shown in FIG. 14, the plurality of rollers 114 included in one group of rolling mechanisms 113 can be arranged at intervals on the bottom surface of the convex beam 1125, so as to ensure that the rollers 114 at the bottom of the lower box body 11 can be supported on the mounting rack after the lower box body 11 is transferred to the mounting rack.

[0103] In some embodiments, as shown in FIG. 16, the battery box 10 further comprises a liquid cooling plate 13 fixed in the battery compartment.

[0104] The liquid cooling plate 13 has an inlet and an outlet, and the bottom edge of the lower box body 11 included in the battery box 10 is provided with an inlet connector and an outlet connector. The inlet and the outlet of the liquid cooling plate 13 are in communication with the inlet connector and the outlet connector at the bottom of the lower box body 11, respectively.

[0105] In this way, by arranging the liquid cooling plate 13, when the internal temperature of the battery compartment is too high, cooling liquid can be introduced through the inlet connector to exchange heat with the internal environment of the battery compartment and the battery module 20 after flowing through the flow channel on the liquid cooling plate 13, so as to achieve cooling of the internal environment. When the internal temperature of the battery compartment is too low, warm fluid can also be introduced through the inlet connector to exchange heat with the internal environment of the battery compartment and the battery module 20 after flowing through the flow channel on the liquid cooling plate 13, so as to achieve heating of the internal environment. In this way, the battery module 20 can be charged and discharged at a suitable temperature, so as to ensure the charging and discharging performance of the battery module 20 and avoid safety hazards caused by high-temperature or low-temperature environments.

[0106] In combination with the specific structure of the lower box body 11 described above, the two groups of rolling mechanisms 113 can be arranged on the lower surface of the bottom plate 111 or on the edge portion 231 of the first opening end of the frame 112. For example, in the case where the edge portion 231 of the side end plate 1123 of the frame 112 is provided with a convex beam 1125 as shown in FIG. 14, the plurality of rollers 114 included in one group of rolling mechanisms 113 can be arranged at intervals on the bottom surface of the convex beam 1125, so as to ensure that the rollers 114 at the bottom of the lower box body 11 can be supported on the mounting rack after the lower box body 11 is transferred to the mounting rack.

[0107] In some embodiments, as shown in FIG. 16, the battery box 10 further comprises a thermal insulation cotton 14 located between the bottom of the lower box body 11 (i.e., the bottom plate 111) and the liquid cooling plate 13.

[0108] Therefore, by arranging the heat preservation cotton 14, the direct contact between the bottom of the lower box body 11 and the liquid cooling plate 13 is isolated, the influence of the environment outside the lower box body 11 on the liquid cooling plate 13 is avoided, and the heat exchange efficiency between the liquid cooling plate 13 and the internal environment of the battery compartment and the battery module 20 is ensured. At the same time, the contact area between the liquid cooling plate 13 and the lower box body 11 can be reduced to avoid the relative friction between the liquid cooling plate 13 and the lower box body 11 when the liquid cooling plate 13 moves, thereby ensuring the safety of the energy storage device 100 during charging and discharging. Furthermore, based on the compressibility of the heat preservation cotton 14, the expansion of the liquid cooling plate 13 can be buffered to avoid the liquid cooling plate 13 being extruded or even the flow channel being collapsed or broken, thereby causing the liquid cooling plate 13 to fail.

[0109] Optionally, the surface of the bottom (i.e., the bottom plate 111) of the lower box body 11 towards the liquid cooling plate 13 has a plurality of protrusions, the plurality of protrusions are distributed along the width direction X of the battery box body 10, and the plurality of protrusions and the inner side wall of the lower box body 11 form a plurality of limiting grooves 234, and each limiting groove 234 has heat preservation cotton 14.

[0110] Therefore, by arranging the limiting grooves 234, the heat preservation cotton 14 is limited to avoid moving in the lower box body 11. At the same time, due to the existence of the protrusions, there is a gap between the adjacent two heat preservation cottons 14, thereby providing a space for movement under the extrusion of the liquid cooling plate 13.

[0111] Of course, in addition to arranging the protrusions on the upper surface of the bottom plate 111 to form the limiting grooves 234 for limiting the heat preservation cotton 14, the heat preservation cotton 14 can also be directly bonded to the upper surface of the bottom plate 111 by an adhesive or the like, as long as the heat preservation cotton 14 can be positioned.

[0112] Optionally, there is a gap between the liquid cooling plate 13 and the inner side wall of the lower box body 11, and the gap is filled with an adhesive.

[0113] Therefore, by arranging the gap, the contact between the liquid cooling plate 13 and the inner side wall of the lower box body 11 can be further reduced, thereby avoiding the generation of metal debris due to the relative friction between the liquid cooling plate 13 and the lower box body 11 when the liquid cooling plate 13 moves. In addition, after filling the gap between the liquid cooling plate 13 and the inner side wall of the lower box body 11 with the adhesive, the liquid cooling plate 13 can be fixed and limited in the battery compartment to ensure the stability of the liquid cooling plate 13 and avoid the movement of the liquid cooling plate 13 when the battery cells 22 included in the battery module 20 are thermally expanded.

[0114] Optionally, the surface of each protrusion has an insulating film layer, and the adhesive is an insulating adhesive. Therefore, by arranging the insulating film layer on the protrusion and arranging the insulating adhesive between the liquid cooling plate 13 and the inner side wall of the lower box body 11, the insulation between the liquid cooling plate 13 and the lower box body 11 is effectively ensured, thereby reducing the possibility of the lower box body 11 being electrified.​

[0115] The insulation film layer can be an insulation coating or an insulation adhesive layer. When the insulation film layer is an insulation adhesive layer, the liquid cooling plate 13 and the bottom plate 111 are insulated, and the liquid cooling plate 13 is pre-fixed, so that the inlet and outlet of the liquid cooling plate 13 are communicated with the inlet and outlet connectors on the bottom of the front end plate 1121.

[0116] In some embodiments, as shown in FIG. 16, the battery box 10 further includes a heat conduction plate 15 on the side of the liquid cooling plate 13 away from the bottom (bottom plate 111) of the lower box 11. The heat conduction plate 15 is arranged to improve the heat exchange efficiency between the liquid cooling plate 13, the internal environment of the battery compartment, and the battery module 20.

[0117] The gap between the heat conduction plate 15 and the liquid cooling plate 13 is filled with heat-conducting adhesive to increase the contact area between the liquid cooling plate 13 and the heat conduction plate 15, thereby increasing the heat exchange area. The heat-conducting adhesive can be filled in the surface of the liquid cooling plate 13 away from the bottom of the lower box 11 (i.e., away from the bottom plate 111), and the surface of the liquid cooling plate 13 can have a plurality of limiting strips. The plurality of limiting strips and the inner side wall of the lower box 11 form a plurality of adhesive grooves, and each of the plurality of adhesive grooves has heat-conducting adhesive. In this way, the heat-conducting adhesive is applied to the liquid cooling plate 13 through the limiting strips, and overflow of the heat-conducting adhesive is avoided.

[0118] The energy storage device 100 of the above embodiments is used to power the electrical equipment. In this way, the assembly yield and efficiency of the electrical equipment are ensured on the basis of ensuring the assembly yield and efficiency of the energy storage device 100.

[0119] In the embodiments of the present application, the terms "first", "second", "third" are only used for descriptive purposes, 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 broadly understood, for example, "connecting" can be fixed connection, or detachable connection, or integral connection; "connected" can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0120] In the description of the implementation of the present application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the implementation of the present application and simplifying 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 implementation of the present application.

[0121] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "a specific embodiment" and the like means 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.

[0122] 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), the lower box (11) and the box cover (12) form a battery compartment, and the box cover (12) comprises a pair of side plates (122) distributed along the width direction (X) of the battery box (10); The battery module (20) is located in the battery compartment, and the battery module (20) comprises a plurality of fixed end plates (21), a plurality of battery cells (22) located between the plurality of fixed end plates (21), and a partition plate (23) covering the top surface of the plurality of battery cells (22), in the width direction (X) of the battery box (10), the distance between the first surface (221) of the battery cell (22) close to the side plate (122) and the side plate (122) increases in the direction from the top of the box cover (12) to the bottom of the lower box (11); Wherein, the battery module (20) comprises a first sub-battery module (20a) adjacent to the side plate (122), the first sub-battery module (20a) comprises a partition plate (23) having an edge portion (231) close to the side plate (122), the edge portion (231) is provided with a first guide surface (232), at least part of the first guide surface (232) is located between the fixed end plate (21) and the side plate (122) in the width direction (X) of the battery box (10). The battery module (20) comprises a fixed bolt (27) passing through the fixed end plate (21) and detachably fixedly connected with the bottom of the lower box (11), the fixed bolt (27) has an exposed end (28) exposed on the side of the fixed end plate (21) away from the bottom of the lower box (11); 2. The energy storage device of claim 1, wherein, The exposed end (28) of the fixed bolt (27) on the first sub-battery module (20a) is located on the side of the first extension surface (233) away from the side plate (122), and the first extension surface (233) is a curved surface extended from the first guide surface (232) along the length direction (Y) of the battery box (10). The box cover (12) comprises a back plate (123) connected with a pair of side plates (122); 3. The energy storage device of claim 1, wherein, In the length direction (Y) of the battery box (10), the distance between the second surface (222) of the battery cell (22) close to the back plate (123) and the back plate (123) increases in the direction from the top of the box cover (12) to the bottom of the lower box (11); ​ The battery module (20) includes a second sub-battery module (20b) adjacent to the back plate (123), the energy storage device (100) includes a cross-connection tab (30), the cross-connection tab (30) includes a connection end (31), a cross-connection part (32) and a bending part (33), the connection end (31) is connected with the second sub-battery module (20b), the cross-connection part (32) is located between the second sub-battery module (20b) and the back plate (123), the bending part (33) connects the connection end (31) and the cross-connection part (32), and the bending part (33) is provided with a second guide surface (34).

4. The energy storage device of claim 3, wherein, The battery module (20) includes a fixing bolt (27) which passes through the fixing end plate (21) and is detachably fixedly connected with the bottom of the lower box body (11), and the fixing bolt (27) has an exposed end (28) exposed on the side of the fixing end plate (21) away from the bottom of the lower box body (11). The exposed end (28) of the fixing bolt (27) on the second sub-battery module (20b) is located on the side of the second extension surface (35) away from the back plate (123), and the second extension surface (35) is a curved surface obtained by extending the second guide surface (34) in the width direction (X) of the battery box body (10).

5. The energy storage device of claim 3, wherein, The surface of the bending part (33) is provided with an insulating film layer.

6. The energy storage device of claim 3, wherein, The first guide surface (232) and the second guide surface (34) are both circular arc transition surfaces.

7. The energy storage device of any one of claims 1-6, wherein, The isolation plate (23) has a pair of edge portions (231) in the width direction (X) of the battery box body (10), and a limiting plate (24) connected with the pair of edge portions (231) and bent towards the bottom of the lower box body (11).

8. The energy storage device of claim 7, wherein, In the width direction (X) of the battery box body (10), the limiting plate (24) has a gap with the first surface (221) of the battery monomer (22).

9. The energy storage device of any one of claims 1-6, wherein, The battery module (20) includes a plurality of connecting tabs (26). The surface of the isolation plate (23) away from the battery monomer (22) has a plurality of limiting grooves (234) corresponding to the plurality of connecting tabs (26), and the groove bottom of each limiting groove (234) has a plurality of through holes (235) penetrating the isolation plate (23), and each through hole (235) exposes an electrode terminal of a different battery monomer (22). Each connecting tab (26) has a plurality of welding areas (261) corresponding to the plurality of through holes (235) in the corresponding limiting groove (234), the connecting tab (26) is limited in the corresponding limiting groove (234), and each welding area (261) is fixedly connected with the electrode terminal of a battery monomer (22) in the area of the corresponding through hole (235).

10. The energy storage device of claim 9, wherein, The groove wall of the limiting groove (234) has a recess (236), and the recess (236) extends to the groove bottom of the limiting groove (234).

11. The energy storage device of claim 10, wherein, The circumferential profile of the limiting groove (234) is rectangular, and the opposite two groove walls of the limiting groove (234) are provided with the recesses (236).

12. The energy storage device of claim 9, wherein, The groove bottom of the limiting groove (234) is provided with a limiting column (237), the connecting tab (26) is provided with a limiting hole (263), and the limiting hole (263) is sleeved on the limiting column (237).

13. The energy storage device of claim 12, wherein, The limiting column (237) is a hot melt column, and the limiting column (237) has a cap portion arranged on the upper surface of the connecting tab (26), and the limiting column (237) has a T-shaped cross section parallel to the height direction of the battery box (10).

14. An electrical device, comprising: The electric 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 electric equipment.

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