Energy storage box, energy storage device and energy storage system

Abstract

The utility model discloses an energy storage box, an energy storage device and an energy storage system, and relates to the technical field of energy storage. The lower box body comprises a longitudinal beam, a cross beam, an end plate and a bottom plate; the longitudinal beam comprises strip-shaped body parts and first bulges, the cross beam is limited between the two first bulges, and the two end parts of the cross beam are respectively attached to the bottom surfaces of the pair of body parts; the end plate is supported on the cross beam and is limited between the pair of body parts; the bottom plate is a liquid cooling plate, and the pair of first edge parts of the bottom plate are fixedly connected with the bottom surfaces of the pair of body parts respectively; the box cover comprises a top plate and a pair of side plates, the top plate is supported on the end plates, and the side plates are fixedly connected with the longitudinal beams. According to the energy storage device, the structure of the lower box body is simplified so as to avoid the die opening design of the lower box body and the box cover, specifically, the longitudinal beams and / or the cross beams of any length can be manufactured through aluminum extrusion or stamping and the like, and therefore the working procedure of die opening design again after the structural size is adjusted is avoided, the development period of the energy storage device is shortened, and the development difficulty is reduced.

Description

Technical Field

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

[0002] The battery pack includes a lower box body, a box cover and a battery module. The lower box body includes a box structure with a top opening surrounded by a bottom plate and a frame, and a liquid cooling plate arranged on the bottom plate. The box cover is closed on the open side of the box structure, and the battery module is accommodated in an energy storage box body surrounded by the lower box body and the box cover.

[0003] Currently, for battery packs of a specific size, combined with the structural composition of the lower box, only structural components such as the frame can be designed with a targeted mold. If the structural dimensions of the battery pack change, the mold needs to be redesigned, which extends the development cycle of new products and increases the difficulty of new product development. Utility Model Content

[0004] A main purpose of this application is to provide an energy storage box, energy storage device and energy storage system that can simplify and shorten the development cycle and reduce the development difficulty.

[0005] To achieve the above application objectives, this application adopts the following technical solutions:

[0006] According to one aspect of the present application, an energy storage box is provided, comprising: a lower box, comprising a pair of longitudinal beams, a pair of cross beams, a pair of end plates and a bottom plate; the pair of longitudinal beams are relatively distributed along the width direction of the energy storage box, the pair of cross beams are relatively distributed along the length direction of the energy storage box, the pair of longitudinal beams and the pair of cross beams are connected end to end and form a rectangular beam frame, the longitudinal beam comprises a strip-shaped main body and a first protrusion located on the bottom surface of the main body, the first protrusion extends to the two ends of the main body, the cross beam is limited between the two first protrusions, and the cross beam The two end portions are respectively fitted with the bottom surfaces of a pair of the main bodies; the pair of end plates are relatively distributed along the length direction of the energy storage box, and the pair of end plates are respectively supported on a pair of the cross beams and limited between the pair of main bodies; the bottom plate is a liquid cooling plate, and a pair of first edge portions on the bottom plate parallel to the length direction of the energy storage box are respectively fixedly connected to the bottom surfaces of a pair of the main bodies; the box cover is a bent U-shaped structure, and includes a top plate and a pair of side plates, the top plate is supported on the pair of end plates, and the pair of side plates are respectively fixedly connected to the pair of longitudinal beams.

[0007] In the embodiment of the present application, the structure of the lower box body is simplified to avoid the need for mold design processes for the various components included in the lower box body and the box cover. At the same time, for the pair of longitudinal beams and / or the pair of transverse beams included in the lower box body, beam structures of any length can be produced through aluminum extrusion processes or stamping processes, thereby avoiding the process of re-molding after adjusting the structural dimensions of the energy storage box body, that is, shortening the development cycle of the energy storage device and reducing the difficulty of developing the energy storage device. In addition, the box cover is a bent U-shaped structure to simplify the manufacturing process of the box cover. Furthermore, when the transverse beam is connected to the longitudinal beam, the bottom surface of the main body and the first protrusion provided on the bottom surface are used to limit the transverse beam in multiple directions (the width direction and the height direction of the energy storage box body), thereby facilitating the improvement of the fixing efficiency of the transverse beam and the longitudinal beam, and further improving the manufacturing yield of the energy storage box body.

[0008] According to one embodiment of the present application, in the height direction of the energy storage box, the first protrusion protrudes from the crossbeam; the first protrusion has a limiting groove with a notch facing away from the box cover, a sliding member is arranged in the limiting groove, and at least a part of the sliding member protrudes from the notch of the limiting groove.

[0009] In the embodiment of the present application, a first protrusion protrudes from the crossbeam, and a sliding member is provided to reduce the contact area between the energy storage box and the bearing surface, while achieving a smaller friction coefficient between the sliding member and the bearing surface, thereby reducing the friction between the energy storage box and the bearing surface when pushing and pulling the energy storage box, that is, reducing the resistance when pushing and pulling the energy storage box.

[0010] According to one embodiment of the present application, the main body has a second protrusion on one side surface in the width direction of the energy storage box, the lower surface of the second protrusion is flush with the bottom surface of the main body, and the second protrusion extends to both ends of the main body; the end plate has a first step facing the crossbeam, the tread of the first step is supported on the upper surface of the second protrusion, and the kick surface of the first step is in contact with the side surface of the second protrusion.

[0011] In the embodiment of the present application, the second protrusion is provided to support the end plate on the second protrusion (longitudinal beam) and the cross beam to improve the stability of the end plate assembly. At the same time, the side surface of the second protrusion cooperates with the riser surface of the first step to facilitate improving the limiting effect of the end plate, thereby improving the assembly yield of the end plate.

[0012] According to one embodiment of the present application, a circular arc transition surface is provided between the upper surface and the side surface of the second protrusion, and a circular arc chamfer is provided between the tread surface and the riser surface of the first step.

[0013] In the embodiment of the present application, when assembling the end plate, the arc transition surface of the second protrusion can be matched with the arc chamfer of the first step to achieve a guiding effect on the end plate, thereby facilitating the assembly of the end plate between a pair of longitudinal beams; at the same time, by setting the arc transition surface on the second protrusion, it is convenient to guide the battery module when assembling the battery module on the side close to the longitudinal beam in the accommodating cavity of the energy storage box, thereby avoiding scratches between the battery cells included in the battery module and the second protrusion, causing damage to the protective blue film on the battery cells, thereby improving the safety of battery module assembly.

[0014] According to one embodiment of the present application, the longitudinal beam has at least one through hole penetrating along the length direction of the energy storage box.

[0015] In the embodiment of the present application, by providing at least one through hole, a weight reduction design of the longitudinal beam is achieved while ensuring the structural strength of the longitudinal beam, thereby achieving a lightweight design of the energy storage box.

[0016] According to an embodiment of the present application, the at least one through hole includes a first through hole, and the first through hole at least passes through the first protrusion.

[0017] In the embodiment of the present application, the first through hole can be reused as an energy-absorbing hole on the basis of realizing the weight reduction design of the longitudinal beam. That is, when the first protrusion collides with an external object, the external force acting on the first protrusion can be dispersed based on the hole wall of the first through hole to achieve the energy absorption effect, thereby improving the structural strength of the longitudinal beam.

[0018] According to one embodiment of the present application, the at least one through hole includes a second through hole, the second through hole passes through the main body, the opening of the second through hole is circular, and an inner wall of one end portion of the second through hole has an internal thread.

[0019] In the embodiment of the present application, the second through hole can be reused as a threaded hole based on the internal thread set on the inner wall of the end portion on the basis of realizing the weight reduction design of the longitudinal beam, so that when the energy storage box is fixed to the mounting frame, the energy storage box can be fixed directly by tightening the fixing screw in the threaded hole, thereby avoiding the need to reprocess the fixing hole on the energy storage box.

[0020] According to one embodiment of the present application, the lower box body further includes a first partition beam, a second partition beam and a third partition beam; the first partition beam, the second partition beam and the third partition beam are sequentially spaced between a pair of end plates along the length direction of the energy storage box body, and the first partition beam, the second partition beam and the third partition beam divide the accommodating cavity of the energy storage box body into a first battery compartment, a second battery compartment and an electrical compartment; the first partition beam and the second partition beam both have a second step facing the box cover, and the kick surfaces of the two second steps are opposite to each other, and the second partition beam and the third partition beam both have a third step facing the box cover, and the kick surfaces of the two third steps are opposite to each other.

[0021] According to one embodiment of the present application, the bottom surface of the main body further has a recessed groove, the recessed groove is located on one side of the first protrusion, and the groove wall away from the side of the first protrusion is open, and a pair of the first edge portions are respectively limited in a pair of the recessed grooves.

[0022] In the embodiment of the present application, by setting the sink groove on the main body, the surface of the first edge portion facing the box cover can be in contact with the bottom of the sink groove, and the side surface of the first edge portion can be in contact with the groove wall of the sink groove, thereby increasing the limiting area of ​​the bottom plate on the main body, so as to improve the limiting effect of the bottom plate, thereby improving the assembly efficiency of the bottom plate, and at the same time improving the assembly stability of the bottom plate.

[0023] According to one embodiment of the present application, the two ends of the sink along the length direction of the energy storage box are respectively located directly above a pair of the cross beams, and a pair of second edge portions on the bottom plate parallel to the width direction of the energy storage box are respectively supported on a pair of the cross beams.

[0024] In the embodiment of the present application, in addition to the first edge portion of the bottom plate being connected to the longitudinal beam, the second edge portion is also supported on the cross beam, so as to improve the supporting strength of the bottom plate for the battery module, thereby improving the structural strength of the energy storage box.

[0025] According to one embodiment of the present application, the lower box body further includes a plurality of reinforcing ribs; the plurality of reinforcing ribs are spaced apart along the length direction of the energy storage box body, each of the reinforcing ribs is limited between two of the first protrusions, and the bottom plate is supported on the plurality of reinforcing ribs.

[0026] According to one embodiment of the present application, the supporting surfaces of a pair of the end plates have a plurality of positioning pins, and a pair of edge portions on the top plate parallel to the width direction of the energy storage box body have a plurality of positioning holes, and the plurality of positioning pins correspond one-to-one to the plurality of positioning holes, and at least a portion of each of the positioning pins is located in the corresponding positioning hole.

[0027] In the embodiment of the present application, the positioning pins on the end plate and the positioning holes on the top plate are provided to facilitate pre-positioning of the box cover when the box cover and the lower box body are closed, thereby improving the fixing efficiency of the box cover and the lower box body.

[0028] According to one embodiment of the present application, a line connecting two of the plurality of positioning holes intersects with both the length direction and the width direction of the energy storage box.

[0029] In the embodiment of the present application, the limitation in the length direction and the width direction of the energy storage box is achieved simultaneously through fewer positioning holes, thereby reducing the provision of positioning pins and positioning holes while ensuring the cover effect of the box cover and the lower box body.

[0030] According to one embodiment of the present application, the top surface of the main body has a third protrusion, and the third protrusion extends to the two ends of the main body; the end plate has a fourth step facing the crossbeam, the tread of the fourth step is supported on the upper surface of the third protrusion, the kick surface of the fourth step abuts against the inner surface of the third protrusion, and the inner surface of the side plate faces the third protrusion and is fixedly connected to the third protrusion.

[0031] In the embodiment of the present application, the third protrusion is provided to support the end plate on the third protrusion (longitudinal beam) and the transverse beam, so as to improve the stability of the end plate assembly. At the same time, the inner surface of the third protrusion is coordinated with the riser surface of the fourth step to facilitate improving the limiting effect of the end plate, thereby improving the assembly yield of the end plate.

[0032] According to one aspect of the present application, an energy storage device is provided, comprising: a battery module and the energy storage box described in the above aspect, wherein the battery module is located in a receiving cavity enclosed by the lower box and the box cover.

[0033] According to one aspect of the present application, an energy storage system is provided, comprising the energy storage device described in the above aspect.

[0034] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The above and other features and advantages of the present application will become more apparent by describing in detail example embodiments thereof with reference to the accompanying drawings.

[0036] Figure 1 is a schematic diagram showing an energy storage system according to an exemplary embodiment.

[0037] Figure 2 FIG1 is a schematic diagram of an exploded structure of an energy storage device according to an exemplary embodiment.

[0038] Figure 3 FIG1 is a schematic diagram of an explosion structure of an energy storage box according to an exemplary embodiment.

[0039] Figure 4 It is a schematic diagram of the axial bottom view of a lower box according to an exemplary embodiment.

[0040] Figure 5 It is a schematic diagram of an exploded structure of a lower box according to an exemplary embodiment.

[0041] Figure 6 yes Figure 4 The diagram shows a partial enlarged structural diagram of the lower box.

[0042] Figure 7 It is a schematic side view of the structure of a lower box according to an exemplary embodiment.

[0043] Figure 8 yes Figure 7 The diagram shows a partial enlarged structural diagram of the lower box.

[0044] Figure 9 yes Figure 3 The diagram shows a partial enlarged structure of the A1 area of ​​the lower box.

[0045] Figure 10 yes Figure 3 The diagram shows a partial enlarged structure of the A2 area of ​​the lower box.

[0046] The description of the accompanying drawings is as follows:

[0047] 100, energy storage device; 200, electric energy conversion device; 300, user load;

[0048] 10. Energy storage box; 20. Battery module; 30. Sampling component; 40. Battery management system;

[0049] 11. Lower box body; 12. Box cover; 13. Longitudinal beam; 14. Cross beam; 15. End plate; 16. Bottom plate; 17. Reinforcement rib;

[0050] 121. Top plate; 122. Side plate; 123. Positioning hole;

[0051] 131. Main body; 132. First protrusion; 133. Second protrusion; 134. Third protrusion; 135. Through hole; 136. Sink;

[0052] 1321. Limiting groove; 1322. Sliding member;

[0053] 1351, first through hole; 1352, second through hole;

[0054] 141. First dividing beam; 142. Second dividing beam; 143. Third dividing beam; 144. Second step; 145. Third step;

[0055] 151. First step; 152. Fourth step; 153. Positioning pin; 154. Front end plate; 155. Rear end plate;

[0056] 161. First edge portion; 162. Second edge portion;

[0057] 21. Fixed end plate; 22. Battery cell; 23. Cable tie. DETAILED DESCRIPTION

[0058] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Like reference numerals in the figures represent like or similar structures, and thus their detailed description will be omitted.

[0059] Since the energy people need is highly temporal and spatial, in order to make rational use of energy and improve utilization rate, it is necessary to use a medium or equipment to store one form of energy in the same energy form, or convert it into another form of energy, and then release it in a specific energy form based on future applications.

[0060] At present, green energy mainly includes solar energy, wind energy, etc., which generally have the problems of strong intermittency and large volatility, which will cause the voltage of the green power grid to be unstable (not enough electricity during peak hours and too much electricity during low hours). Unstable voltage will cause damage to electricity. Therefore, it may cause the problem of "wind and solar power abandonment" due to insufficient electricity demand or insufficient grid acceptance capacity.

[0061] To address the issue of insufficient electricity demand or insufficient grid capacity, energy storage devices are essential. These devices convert electrical energy into other forms of energy through physical or chemical means, storing it. When needed, the stored energy is converted back into electricity and released. Simply put, an energy storage device acts like a large "power bank," storing electricity when there's sufficient solar or wind energy and releasing it when needed.

[0062] Currently, energy storage (i.e., energy storage) has a wide range of application scenarios, including power generation-side energy storage, grid-side energy storage, renewable energy grid-connected energy storage, and user-side energy storage. The corresponding types of energy storage devices include:

[0063] (1) Large energy storage containers used in grid-side energy storage scenarios can serve as high-quality active and reactive power regulation power sources in the grid, achieving load matching of electricity in time and space, enhancing the ability to absorb renewable energy, and are of great significance in grid system backup, alleviating peak load power supply pressure, and peak and frequency regulation;

[0064] (2) The main operating mode of small and medium-sized energy storage cabinets used in industrial and commercial energy storage scenarios (banks, shopping malls, etc.) on the user side and small household energy storage boxes used in home energy storage scenarios on the user side is "peak shaving and valley filling". Since there is a large price difference in electricity prices at peak and valley locations according to electricity demand, after users have energy storage equipment, in order to reduce costs, they usually charge the energy storage device (energy storage cabinet / box) during the low electricity price period; during the peak electricity price period, the electricity in the energy storage device is discharged for use to achieve the purpose of saving electricity bills. In addition, in remote areas and areas with high incidence of natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices is equivalent to users providing themselves and the power grid with backup power, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0065] An embodiment of the present application provides an energy storage system, which includes an energy storage device to store or supply electric energy through the energy storage device.

[0066] Taking the outdoor energy storage scenario in grid-side energy storage as an example, Figure 1 The schematic diagram of an energy storage system provided by an embodiment of the present application is illustrated. The energy storage system includes an energy storage device 100, an electric energy conversion device 200, and a user load 300. The electric energy conversion device 200 (including a solar energy conversion device and a wind energy conversion device) is electrically connected to the energy storage device 100, and the energy storage device 100 is electrically connected to the user load 300. In this way, solar energy, wind energy, or other forms of energy can be converted into electrical energy by the electric energy conversion device 200 and stored by the energy storage device 100. The energy can then be supplied to the user load 300 for use through the energy storage device 100 during peak electricity prices, or supplied to the user load 300 for use through the energy storage device 100 during a power outage / blackout.

[0067] Among them, the energy storage device 100 can be a battery pack, a battery box, a battery system, etc. composed of battery cells 22. The battery cells 22 can be lithium-ion batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, magnesium-ion batteries, etc., and the battery cells 22 can be cylindrical, flat, rectangular, etc., and the embodiments of the present application do not limit this. Specifically, the battery cells 22 included in the energy storage device 100 can realize the charging and discharging process by chemical reactions or changes of energy storage media (chemical elements). Simply put, light energy, wind energy, etc. are converted into electrical energy through chemical reactions or changes of energy storage media and stored in battery cells 22. When the use of external electricity reaches a peak, the electrical energy stored in the battery cells 22 is released for use through chemical reactions or changes of the energy storage medium, or transferred for use.

[0068] In some embodiments, as Figure 2 As shown, the energy storage device 100 includes: a battery module 20 and an energy storage box 10 , and the battery module 20 is located in the accommodating cavity of the energy storage box 10 .

[0069] The accommodating cavity can accommodate multiple battery modules 20, and the more battery modules 20 there are, the higher the capacity of the energy storage device 100 is, making it easier to meet the power demand. For example, the number of battery modules 20 can be 2, 4, 6, 8, etc. For example, Figure 2 As shown, the accommodating cavity of the energy storage box 10 accommodates two rows of battery modules 20 distributed along the length direction X of the energy storage box 10 and four columns of battery modules 20 distributed along the width direction Y of the energy storage box 10, that is, the accommodating cavity of the energy storage box 10 accommodates eight battery modules 20.

[0070] Among them, Figure 2 As shown, the battery module 20 includes a pair of opposed fixed end plates 21 and a plurality of battery cells 22 positioned between the pair of fixed end plates 21. The plurality of battery cells 22 and the pair of fixed end plates 21 can be secured together using a binding tool such as a cable tie 23. Furthermore, the fixed end plates 21 have mounting holes extending along the height direction H of the energy storage case 10. The battery module 20 includes locking bolts that pass through the mounting holes and are fixedly connected to the bottom of the energy storage case 10 to secure the battery module 20 within the accommodating cavity.

[0071] Among them, Figure 2 As shown, the energy storage device 100 includes a sampling assembly 30 , wherein the plurality of sampling assemblies 30 correspond one-to-one to the plurality of battery modules 20 , and each sampling assembly 30 is located on the top of the corresponding battery module 20 .

[0072] Optionally, the sampling assembly 30 includes an isolation plate and a flexible circuit board. The isolation plate covers the multiple battery cells 22 of the corresponding battery module 20 . The flexible circuit board is located on a side of the isolation plate away from the battery cells 22 and is connected to the multiple battery cells 22 of the corresponding battery module 20 .

[0073] like Figure 2 As shown, the flexible circuit board included in the sampling component 30 is connected to the battery management system 40 of the energy storage device 100. The setting of the flexible circuit board avoids the setting of the collection harness, thereby simplifying the connection between the battery cell 22 and the battery management system 40, and at the same time facilitating the improvement of the power safety of the energy storage device 100.

[0074] In some embodiments, as Figure 2 or Figure 3 As shown, the energy storage box 10 includes: a lower box body 11 and a box cover 12 , and the box cover 12 covers the lower box body 11 to enclose a receiving cavity of the energy storage box 10 .

[0075] Among them, Figure 4 or Figure 5 ,as well as Figure 6 As shown, the lower box body 11 includes a pair of longitudinal beams 13 , a pair of transverse beams 14 , a pair of end plates 15 and a bottom plate 16 . A pair of longitudinal beams 13 are relatively distributed along the width direction Y of the energy storage box 10, and a pair of cross beams 14 are relatively distributed along the length direction X of the energy storage box 10. The pair of longitudinal beams 13 and the pair of cross beams 14 are connected end to end and form a rectangular beam frame. The longitudinal beam 13 includes a strip-shaped main body 131 and a first protrusion 132 located on the bottom surface of the main body 131. The first protrusion 132 extends to the two ends of the main body 131. The cross beam 14 is limited between the two first protrusions 132, and the two ends of the cross beam 14 are respectively fitted with the bottom surfaces of the pair of main bodies 131; a pair of end plates 15 are relatively distributed along the length direction X of the energy storage box 10, and the pair of end plates 15 are respectively supported on the pair of cross beams 14 and limited between the pair of main bodies 131; the bottom plate 16 is a liquid cooling plate, and the bottom plate 16 has a pair of first edge portions 161 parallel to the length direction X of the energy storage box 10, and the pair of first edge portions 161 are respectively fixedly connected to the bottom surfaces of the pair of main bodies 131. Figure 3 As shown, the box cover 12 is a bent U-shaped structure, and includes a top plate 121 and a pair of side plates 122 . The top plate 121 is supported on a pair of end plates 15 , and the pair of side plates 122 are fixedly connected to a pair of longitudinal beams 13 respectively.

[0076] In the embodiment of the present application, the structure of the lower case 11 is simplified to avoid the need for mold design processes for the various components included in the lower case 11 and the case cover 12. At the same time, the pair of longitudinal beams 13 and / or the pair of transverse beams 14 included in the lower case 11 can be manufactured into beam structures of any length through aluminum extrusion or stamping processes, thereby avoiding the process of re-molding after adjusting the structural dimensions of the energy storage case 10, thereby shortening the development cycle of the energy storage device 100 and reducing the difficulty of developing the energy storage device 100. In addition, the case cover 12 has a bent U-shaped structure to simplify the manufacturing process of the case cover 12. Furthermore, when the transverse beam 14 is connected to the longitudinal beam 13, the bottom surface of the main body 131 and the first protrusion 132 provided on the bottom surface are used to limit the transverse beam 14 in multiple directions (the width direction Y and the height direction H of the energy storage case 10), thereby facilitating the improvement of the fixing efficiency of the transverse beam 14 and the longitudinal beam 13, thereby improving the manufacturing yield of the energy storage case 10.

[0077] The end face of the main body 131 can be polygonal, such as a rectangle or trapezoid. The bottom surface of the main body 131 having the first protrusion 132 is the surface of the main body 131 facing away from the cover 12. The pair of crossbeams 14 includes a front crossbeam and a rear crossbeam. The pair of end plates 15 includes a front end plate 154 and a rear end plate 155. The front end plate 154 and the rear end plate 155 are supported on the front crossbeam and the rear end plate 155, respectively. The battery management system included in the energy storage device 100 is located near the front end plate 154. The front end plate 154 is provided with a maintenance port to expose the battery management system 40, thereby facilitating maintenance of the battery management system 40.

[0078] The edge of the bottom plate 16 (second edge 162) near the front plate 154 has a liquid inlet and outlet pipe. These pipes are connected to the two ports of the liquid cooling channel on the bottom plate 16, respectively. The inlet and outlet pipes pass through the front plate 154 and extend out of the energy storage box 10. The connection between the liquid inlet pipe, the liquid cooling channel, and the outlet pipe enables the circulation of coolant, thereby cooling the battery module 20.

[0079] The bottom plate 16 is a liquid cooling plate. In this case, the surface of the bottom plate 16 facing and / or facing away from the box cover 12 may be a corrugated surface. When the surface of the bottom plate 16 facing away from the box cover 12 is a corrugated surface, and the surface facing the box cover 12 is a flat surface, sufficient heat transfer area is provided between the battery modules 20 supported on the bottom plate 16 and the bottom plate 16. In this case, partition bars spaced along the width direction Y of the energy storage box 10 can be provided on the surface of the bottom plate 16 facing the box cover 12. The multiple partition bars and a pair of longitudinal beams 13 divide the storage cavity of the energy storage box 10 into multiple storage areas, each of which is used to accommodate a row of battery modules 20. When both the surfaces of the bottom plate 16 facing and away from the box cover 12 are corrugated, the corrugated surface affects the contact area between the bottom plate 16 and the battery module 20, thereby affecting the heat transfer efficiency. In this case, a heat conducting plate can be provided on the surface of the bottom plate 16 facing the box cover 12, as well as spaced-apart dividing strips along the width direction Y of the energy storage box 10. Thermally conductive adhesive is filled between the heat conducting plate and the bottom plate 16. Multiple dividing strips and a pair of longitudinal beams 13 divide the accommodating cavity of the energy storage box 10 into multiple accommodating areas, each of which is used to accommodate a row of battery modules 20. In this way, the provision of the heat conducting plate and the thermally conductive adhesive filled between the heat conducting plate and the bottom plate 16 improves the heat transfer effect between the bottom plate 16 and the battery module 20, thereby improving the cooling effect on the battery module 20.

[0080] In some embodiments, as Figure 7 and Figure 8 As shown, in the height direction H of the energy storage box 10, the first protrusion 132 protrudes from the crossbeam 14. As such, only the first protrusion 132 is supported on the support surface of the mounting frame. This prevents friction between the crossbeam 14 and the support surface when the energy storage box 10 is pushed or pulled, and simultaneously reduces friction between the energy storage box 10 and the support surface, thereby reducing resistance when pushing or pulling the energy storage box 10.

[0081] Alternatively, as Figure 8 As shown, the first protrusion 132 has a limiting groove 1321 with its opening facing away from the cover 12. A sliding member 1322 is disposed within the limiting groove 1321, with at least a portion of the sliding member 1322 protruding from the opening of the limiting groove 1321. Thus, the provision of the sliding member 1322 further reduces the contact area between the energy storage case 10 and the load-bearing surface, while also achieving a lower coefficient of friction between the sliding member 1322 and the load-bearing surface, thereby further reducing push-pull resistance when pushing or pulling the energy storage case 10.

[0082] The first protrusion 132 may have a plurality of spaced-apart limiting grooves 1321 along the longitudinal direction X of the energy storage case 10, with each of the plurality of limiting grooves 1321 being provided with a sliding member 1322. Alternatively, the first protrusion 132 may have a plurality of spaced-apart limiting grooves 1321 extending along the longitudinal direction X of the energy storage case 10 to both ends of the first protrusion 132, with each of the plurality of sliding members 1322 being spaced-apart within the limiting grooves 1321. The sliding member 1322 may be a sliding roller, a slider having a smooth surface, or the like.

[0083] In some embodiments, as Figure 8 As shown, the main body 131 has a second protrusion 133 on one side surface in the width direction Y of the energy storage box 10, the lower surface of the second protrusion 133 is flush with the bottom surface of the main body 131, and the second protrusion 133 extends to both ends of the main body 131; the end plate 15 has a first step 151 facing the crossbeam 14, the tread of the first step 151 is supported on the upper surface of the second protrusion 133, and the kick surface of the first step 151 abuts against the side surface of the second protrusion 133.

[0084] In this way, by setting the second protrusion 133, the support of the end plate 15 on the second protrusion 133 (longitudinal beam 13) and the cross beam 14 is realized to improve the stability of the assembly of the end plate 15. At the same time, by the cooperation between the side surface of the second protrusion 133 and the kick surface of the first step 151, it is convenient to improve the limiting effect of the end plate 15, thereby improving the assembly yield of the end plate 15.

[0085] The aforementioned tread is the surface of the first step 151 perpendicular to the height of the energy storage case 10, and the riser is the surface of the first step 151 parallel to the height of the energy storage case 10. Furthermore, the treads described subsequently are all surfaces of the corresponding steps perpendicular to the height of the energy storage case 10, and the risers are all surfaces of the corresponding steps parallel to the height of the energy storage case 10. The side surface of the main body 131 having the second protrusion 133 is the pair of surfaces of the main body 131 that face each other, so that the two opposing second protrusions 133 can support the end plate 15.

[0086] Optionally, an arc transition surface is provided between the upper surface and the side surface of the second protrusion 133, and an arc chamfer is provided between the tread and the riser surface of the first step 151. In this way, when assembling the end plate 15, the arc transition surface of the second protrusion 133 can cooperate with the arc chamfer of the first step 151 to achieve a guiding effect on the end plate 15, thereby facilitating the assembly of the end plate 15 between the pair of longitudinal beams 13; at the same time, the provision of the arc transition surface on the second protrusion 133 facilitates the guidance of the battery module 20 when assembling the battery module 20 on the side close to the longitudinal beam 13 in the accommodating cavity of the energy storage box 10, thereby avoiding scratches between the battery cells 22 included in the battery module 20 and the second protrusion 133, which may cause damage to the protective blue film on the battery cells 22, thereby improving the safety of the assembly of the battery module 20.

[0087] In some embodiments, as Figure 8 As shown, the top surface of the main body 131 has a third protrusion 134, and the third protrusion 134 extends to the two ends of the main body 131; the end plate 15 has a fourth step 152 facing the crossbeam 14, and the tread of the fourth step 152 is supported on the upper surface of the third protrusion 134, and the kick surface of the fourth step 152 abuts against the inner surface of the third protrusion 134.

[0088] The top surface of the main body 131 with the third protrusion 134 is the surface of the main body 131 facing the box cover 12 when the main body 131 is laid flat. In this way, the provision of the third protrusion 134 supports the end plate 15 on the third protrusion 134 (longitudinal beam 13) and the cross beam 14, thereby improving the assembly stability of the end plate 15. At the same time, the inner surface of the third protrusion 134 cooperates with the riser surface of the fourth step 152 to improve the limiting effect of the end plate 15, thereby improving the assembly yield of the end plate 15.

[0089] Optionally, an arc transition surface is provided between the upper surface and the inner surface of the third protrusion 134, and an arc chamfer is provided between the tread and the riser surface of the fourth step 152. In this way, when assembling the end plate 15, the arc transition surface of the third protrusion 134 can cooperate with the arc chamfer of the fourth step 152 to achieve a guiding effect on the end plate 15, thereby facilitating the assembly of the end plate 15 between the pair of longitudinal beams 13. At the same time, the provision of the arc transition surface on the third protrusion 134 facilitates the guidance of the battery module 20 when assembling the battery module 20 on the side close to the longitudinal beam 13 in the accommodating cavity of the energy storage box 10, thereby avoiding scratches between the battery cells 22 included in the battery module 20 and the third protrusion 134, which may cause damage to the protective blue film on the battery cells 22, thereby improving the safety of the battery module 20 assembly.

[0090] It should be noted that, in combination with the third protrusion 134 included in the longitudinal beam 13, for the side panel 122 included in the box cover 12, the inner surface of the side panel 122 faces the third protrusion 134 of the corresponding longitudinal beam 13 and is fixedly connected to the third protrusion 134, so that the box cover 12 and the longitudinal beam 13 can be fixedly connected.

[0091] Furthermore, the side surface of the end plate 15 parallel to the height direction H of the energy storage device 100 is flush with the outer surface of the third protrusion 134. At this time, the side plate 122 included in the box cover 12 can be fixedly connected to the side surface of the end plate 15 at the same time to ensure the stability of the connection between the box cover 12 and the lower box body 11.

[0092] In some embodiments, as Figure 8 As shown, the longitudinal beam 13 has at least one through hole 135 extending through the energy storage box 10 along the length direction X. Thus, by providing at least one through hole 135, the longitudinal beam 13 is designed to be lightweight while maintaining the structural strength, thereby achieving a lightweight design of the energy storage box 10.

[0093] Alternatively, as Figure 8 As shown, at least one through hole 135 includes a first through hole 1351, which extends through at least the first protrusion 132. In this way, the first through hole 1351 not only reduces the weight of the longitudinal beam 13 but also serves as an energy-absorbing hole. Specifically, when the first protrusion 132 collides with an external object, the external force acting on the first protrusion 132 can be dispersed through the first through hole 1351, thereby achieving an energy-absorbing effect and improving the structural strength of the longitudinal beam 13.

[0094] For example, Figure 8 As shown, the first through hole 1351 penetrates the first protrusion 132 and the main body 131 at the same time, that is, in the height direction H of the energy storage box 10, the upper part of the first through hole 1351 penetrates the main body 131, and the lower part penetrates the first protrusion 132. In this way, the opening size of the first through hole 1351 can be increased, thereby improving the energy absorption effect of the first through hole 1351.

[0095] Alternatively, as Figure 8 As shown, at least one through hole 135 includes a second through hole 1352, which extends through the main body 131. The opening of the second through hole 1352 is circular, and the inner wall of one end of the second through hole 1352 has an internal thread. In this case, the second through hole 1352, while achieving a weight reduction design for the longitudinal beam 13, can also be reused as a threaded hole based on the internal thread provided on the inner wall of the end. When securing the energy storage box 10 to the mounting bracket, the energy storage box 10 can be secured directly by tightening the fixing screw in the threaded hole, thus avoiding the need to re-machine the fixing hole in the energy storage box 10.

[0096] In particular, in combination with the above-mentioned situation where the pair of end plates 15 include a front end plate 154, an inner wall of the second through hole 1352 near the end of the front end plate 154 may be provided with an internal thread, so that the energy storage box 10 can be fixed at the front end of the energy storage box 10 through a reused threaded hole.

[0097] In the embodiment of the present application, the bottom plate 16 is arranged on the bottom surface of the main body 131, and the pair of first edge portions 161 on the main body 131 are respectively attached to the bottom surface of the pair of bodies and then fixed, or the bottom plate 16 is arranged on the bottom surface of the main body 131, and the pair of first edge portions 161 on the main body 131 are respectively attached to the bottom surface of the pair of bodies and then fixed. Figure 8 As shown, the bottom surface of the main body 131 has a recessed groove 136 , which is located on one side of the first protrusion 132 , and the groove wall of the recessed groove 136 away from the first protrusion 132 is open, and the pair of first edge portions 161 are respectively limited in the pair of recessed grooves 136 .

[0098] In this way, by setting the groove 136 on the main body 131, the surface of the first edge portion 161 facing the box cover 12 can be in contact with the bottom of the groove 136, and the side surface of the first edge portion 161 can be in contact with the groove wall of the groove 136, thereby increasing the limiting area of ​​the bottom plate 16 on the main body 131, thereby improving the limiting effect of the bottom plate 16, thereby improving the assembly efficiency of the bottom plate 16, and at the same time improving the assembly stability of the bottom plate 16.

[0099] The thickness of the first edge portion 161 on the bottom plate 16 is equal to the depth of the recessed groove 136 to ensure that the surface of the first edge portion 161 facing away from the box cover 12 is flush with the bottom surface of the main body 131, thereby increasing the contact area between the side surface of the first edge portion 161 and the groove wall of the recessed groove 136, thereby increasing the welding area of ​​the first edge portion 161 of the bottom plate 16 when welded in the recessed groove 136, and increasing the stability of the welding.

[0100] The length of the sink 136 in the longitudinal direction X of the energy storage box 10 can be equal to the distance between the opposite surfaces of the pair of beams 14, or can be greater than the distance between the opposite surfaces of the pair of beams 14 and less than the distance between the opposite surfaces.

[0101] When the length of the sink 136 is equal to the distance between the opposing surfaces of the pair of crossbeams 14, the walls of the sink 136 at both ends along the length direction X are flush with the opposing surfaces of the pair of crossbeams 14. In this case, the bottom plate 16 has a pair of second edge portions 162 parallel to the width direction Y of the energy storage box 10, and the side surfaces of the pair of second edge portions 162 are flush with the opposing surfaces of the pair of crossbeams 14. This allows the second edge portions 162 of the bottom plate 16 to be fixedly connected to the crossbeams 14 by welding, thereby improving the structural stability of the lower box 11. Of course, the length of the sink 136 can also be slightly less than the distance between the opposing surfaces of the pair of crossbeams 14, as long as the second edge portions 162 of the bottom plate 16 can be fixedly connected to the crossbeams 14.

[0102] When the length of the sink 136 is greater than the distance between the opposite surfaces of the pair of beams 14 and less than the distance between the opposite back surfaces, the two ends of the sink 136 along the length direction X are respectively located directly above the pair of beams 14. Figure 5 and Figure 8 As shown, the bottom plate 16 has a pair of second edge portions 162 parallel to the width direction Y of the energy storage case 10, and the pair of second edge portions 162 are respectively supported on the pair of crossbeams 14. At this point, the surface of the second edge portions 162 of the bottom plate 16 facing the case cover 12 is in contact with the bottom surface of the crossbeam 14, and can be fixedly connected by adhesive, welding, etc., thereby improving the structural stability of the lower case 11. In addition, in addition to the first edge portion 161 of the bottom plate 16 being connected to the longitudinal beam 13, the second edge portion 162 of the bottom plate 16 is also supported on the crossbeam 14, which facilitates improving the support strength of the bottom plate 16 for the battery module 20, thereby improving the structural strength of the energy storage case 10.

[0103] In some embodiments, as Figure 4 or Figure 5 As shown, the lower box body 11 further includes a plurality of reinforcing ribs 17 ; the plurality of reinforcing ribs 17 are spaced apart along the length direction X of the energy storage box body 10 , each reinforcing rib 17 is limited between two first protrusions 132 , and the bottom plate 16 is supported on the plurality of reinforcing ribs 17 .

[0104] Among them, the two ends of each reinforcing rib 17 are fixedly connected to a pair of longitudinal beams 13 respectively. In this way, the stability of the structure of the lower box body 11 is improved by setting multiple reinforcing ribs 17 and fixing each reinforcing rib 17 to a pair of longitudinal beams 13. In addition, the bottom plate 16 is provided to be supported on multiple reinforcing ribs 17, thereby improving the supporting strength of the bottom plate 16 for the battery module 20, thereby improving the structural strength of the energy storage box body 10.

[0105] Among them, the reinforcing rib 17 can be a strip-shaped flat plate structure or a strip-shaped corrugated plate structure. For the corrugated plate structure, the arrangement direction of the corrugations is the length direction X of the energy storage box 10, which makes it easier to improve the supporting strength of the reinforcing rib 17 on the bottom plate 16.

[0106] In the embodiment of the present application, for the battery modules 20 accommodated in the accommodating cavity of the energy storage box 10, the accommodating cavity can accommodate one row of battery modules 20 distributed along the length direction X of the energy storage box 10, or two rows of battery modules 20 distributed along the length direction X of the energy storage box 10, or three or four rows of battery modules 20 distributed along the length direction X of the energy storage box 10.

[0107] When a row of battery modules 20 is accommodated in the accommodating cavity, the lower box body 11 further includes a first partition beam 141 and a second partition beam 142. The first partition beam 141 and the second partition beam 142 are sequentially spaced apart along the length direction X of the energy storage box body 10 between a pair of end plates 15, that is, they are sequentially spaced apart along the length direction X of the energy storage box body 10 between the front end plate 154 and the rear end plate 155.

[0108] Among them, the first partition beam 141 is arranged adjacent to the rear end plate 155, so that the accommodating cavity of the energy storage box 10 is divided into an electrical compartment between the second partition beam 142 and the front end plate 154, and a battery compartment between the first partition beam 141 and the second partition beam 142 through the first partition beam 141 and the second partition beam 142. The electrical compartment is used to accommodate the battery management system 40, and the battery compartment is used to accommodate the battery module 20.

[0109] Optionally, both the first and second partition beams 141, 142 have fifth steps facing the tank cover 12. Specifically, the treads of the two fifth steps face the tank cover 12, and the risers of the two fifth steps face each other. Thus, when the battery module 20 is placed between the first and second partition beams 141, 142, the pair of fixed end plates 21 included in the battery module 20 are supported on the treads of the two fifth steps and positioned between the risers of the two fifth steps, thereby ensuring the stability of the battery module 20 between the first and second partition beams 141, 142.

[0110] When two rows of battery modules 20 are contained in the accommodating cavity, as shown in FIG. Figure 3 or Figure 5As shown, the lower box body 11 also includes a first partition beam 141, a second partition beam 142 and a third partition beam 143. The first partition beam 141, the second partition beam 142 and the third partition beam 143 are sequentially spaced between a pair of end plates 15 along the length direction X of the energy storage box body 10, that is, they are sequentially spaced between the front end plate 154 and the rear end plate 155 along the length direction X of the energy storage box body 10, and the first partition beam 141, the second partition beam 142 and the third partition beam 143 divide the accommodating cavity into an electrical compartment, a first battery compartment and a second battery compartment.

[0111] Among them, the first partition beam 141 is arranged adjacent to the rear end plate, so that the accommodating cavity of the energy storage box 10 is divided into an electrical compartment between the third partition beam 143 and the front end plate 154, a first battery compartment between the second partition beam 142 and the third partition beam 143, and a second battery compartment between the first partition beam 141 and the second partition beam 142 through the first partition beam 141, the second partition beam 142 and the third partition beam 143. The electrical compartment is used to accommodate the battery management system 40, the first battery compartment is used to accommodate the first row of battery modules 20, and the second battery compartment is used to accommodate the second row of battery modules 20.

[0112] Alternatively, as Figure 3 or Figure 5 As shown, the first partition beam 141 and the second partition beam 142 both have a second step 144 facing the box cover 12, that is, the treads of the two second steps 144 both face the box cover 12, and the risers of the two second steps 144 are opposite to each other; the second partition beam 142 and the third partition beam 143 both have a third step 145 facing the box cover 12, that is, the treads of the two third steps 145 both face the box cover 12, and the risers of the two third steps 145 are opposite to each other. In this way, when the first row of battery modules 20 is placed between the first partition beam 141 and the second partition beam 142, the pair of fixed end plates 21 included in the first row of battery modules 20 are respectively supported on the treads of the two second steps 144, and are limited between the risers of the two second steps 144, thereby ensuring the stability of the first row of battery modules 20 fixed between the first partition beam 141 and the second partition beam 142; when the second row of battery modules 20 is placed between the second partition beam 142 and the third partition beam 143, the pair of fixed end plates 21 included in the second row of battery modules 20 are respectively supported on the treads of the two third steps 145, and are limited between the risers of the two third steps 145, thereby ensuring the stability of the second row of battery modules 20 fixed between the second partition beam 142 and the third partition beam 143.

[0113] In some embodiments, as Figure 3 、 Figure 9 and Figure 10As shown, the supporting surfaces of a pair of end plates 15 (i.e., the surfaces facing the top plate 121) have positioning pins 153, and a pair of edge portions on the top plate 121 parallel to the width direction Y of the energy storage box 10 have positioning holes 123, and multiple positioning pins 153 correspond one-to-one to multiple positioning holes 123, and at least a portion of each positioning pin 153 is located in the corresponding positioning hole 123.

[0114] In this way, by setting the positioning pins 153 on the end plate 15 and the positioning holes 123 on the top plate 121, it is convenient to pre-position the box cover 12 when closing the box cover 12 and the lower box body 11, thereby improving the fixing efficiency of the box cover 12 and the lower box body 11.

[0115] The positioning pins 153 provided on the end plates 15 may be provided with limit holes on the support surfaces of the end plates 15, with the limit pins being retained within the limit holes by bonding or interference fit. Furthermore, the support surfaces of a pair of end plates 15 may each have positioning pins 153, or one end plate 15 may have multiple positioning pins 153 while the other end plate 15 may not have positioning pins 153. This is sufficient as long as the top plate 121 can be securely positioned.

[0116] Optionally, a line connecting two of the plurality of positioning holes 123 intersects both the length direction X and the width direction Y of the energy storage case 10. In this way, the top plate 121 can be positioned in the oblique direction by the cooperation between the two positioning holes 123 and the corresponding two positioning pins 153. That is, the energy storage case 10 can be simultaneously limited in the length direction X and the width direction Y by using fewer positioning holes 123, thereby ensuring the covering effect of the case cover 12 and the lower case 11 while reducing the number of positioning pins 153 and positioning holes 123.

[0117] In the embodiments of the present application, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise expressly defined. Terms such as "installed", "connected", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill 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.

[0118] In the description of the embodiments of the present application, it should be understood that the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "front", and "back" are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the embodiments of the present application.

[0119] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the implementation methods of this application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0120] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be modified and varied in various ways. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. An energy storage box, characterized in that: include: The lower box body (11) includes a pair of longitudinal beams (13), a pair of transverse beams (14), a pair of end plates (15) and a bottom plate (16); The pair of longitudinal beams (13) are relatively distributed along the width direction of the energy storage box (10), and the pair of cross beams (14) are relatively distributed along the length direction of the energy storage box (10). The pair of longitudinal beams (13) and the pair of cross beams (14) are connected end to end and form a rectangular beam frame. The longitudinal beam (13) includes a strip-shaped main body (131) and a first protrusion (132) located on the bottom surface of the main body (131). The first protrusion (132) extends to two ends of the main body (131). The cross beam (14) is limited between the two first protrusions (132), and the two ends of the cross beam (14) are respectively in contact with the bottom surfaces of the pair of main bodies (131). The pair of end plates (15) are relatively distributed along the length direction of the energy storage box (10), and the pair of end plates (15) are respectively supported on a pair of cross beams (14) and are limited between a pair of main body parts (131); The bottom plate (16) is a liquid cooling plate, and the bottom plate (16) has a pair of first edge portions (161) parallel to the length direction of the energy storage box (10), and the pair of first edge portions (161) are respectively fixedly connected to the bottom surfaces of the pair of main body portions (131); The box cover (12) is a bent U-shaped structure and includes a top plate (121) and a pair of side plates (122). The top plate (121) is supported on the pair of end plates (15), and the pair of side plates (122) are respectively fixedly connected to the pair of longitudinal beams (13).

2. The energy storage box according to claim 1, characterized in that: In the height direction of the energy storage box (10), the first protrusion (132) protrudes from the crossbeam (14); The first protrusion (132) has a limiting groove (1321) with a notch facing away from the box cover (12); a sliding member (1322) is provided in the limiting groove (1321), and at least a portion of the sliding member (1322) protrudes from the notch of the limiting groove (1321).

3. The energy storage box according to claim 1, characterized in that: The main body (131) has a second protrusion (133) on one side surface in the width direction of the energy storage box (10), the lower surface of the second protrusion (133) is flush with the bottom surface of the main body (131), and the second protrusion (133) extends to both ends of the main body (131); The end plate (15) has a first step (151) facing the crossbeam (14), the tread of the first step (151) is supported on the upper surface of the second protrusion (133), and the riser of the first step (151) abuts against the side surface of the second protrusion (133).

4. The energy storage box according to claim 3, characterized in that: An arc transition surface is provided between the upper surface and the side surface of the second protrusion (133), and an arc chamfer is provided between the tread surface and the riser surface of the first step (151).

5. The energy storage box according to claim 1, characterized in that: The longitudinal beam (13) has at least one through hole (135) penetrating along the length direction of the energy storage box (10).

6. The energy storage box according to claim 5, characterized in that: The at least one through hole (135) includes a first through hole (1351), and the first through hole (1351) at least passes through the first protrusion (132).

7. The energy storage box according to claim 5, characterized in that: The at least one through hole (135) includes a second through hole (1352), the second through hole (1352) passes through the main body (131), the opening of the second through hole (1352) is circular, and the inner wall of one end of the second through hole (1352) has an internal thread.

8. The energy storage box according to claim 1, characterized in that: The lower box (11) further comprises a first partition beam (141), a second partition beam (142) and a third partition beam (143); The first partition beam (141), the second partition beam (142), and the third partition beam (143) are sequentially spaced and distributed between a pair of end plates (15) along the length direction of the energy storage box (10); the first partition beam (141), the second partition beam (142), and the third partition beam (143) divide the accommodating cavity of the energy storage box (10) into a first battery compartment, a second battery compartment, and an electrical compartment; The first partition beam (141) and the second partition beam (142) both have a second step (144) facing the box cover (12), and the kick surfaces of the two second steps (144) are opposite to each other; the second partition beam (142) and the third partition beam (143) both have a third step (145) facing the box cover (12), and the kick surfaces of the two third steps (145) are opposite to each other.

9. The energy storage box according to claim 1, characterized in that: The bottom surface of the main body (131) further comprises a recessed groove (136), the recessed groove (136) being located on one side of the first protrusion (132), and the groove wall on the side away from the first protrusion (132) being open, and a pair of the first edge portions (161) being respectively limited in a pair of the recessed grooves (136).

10. The energy storage box according to claim 9, characterized in that: The two ends of the sink (136) along the length direction of the energy storage box (10) are respectively located directly above a pair of the cross beams (14); the bottom plate (16) has a pair of second edge portions (162) parallel to the width direction of the energy storage box (10); and the pair of second edge portions (162) are respectively supported on the pair of the cross beams (14).

11. The energy storage box according to claim 9 or 10, characterized in that: The lower box body (11) further includes a plurality of reinforcing ribs (17); The plurality of reinforcing ribs (17) are spaced apart along the length direction of the energy storage box (10), each of the reinforcing ribs (17) is limited between two of the first protrusions (132), and the bottom plate (16) is supported on the plurality of reinforcing ribs (17).

12. The energy storage box according to claim 1, characterized in that: The supporting surfaces of a pair of end plates (15) are provided with a plurality of positioning pins (153); a pair of edge portions on the top plate (121) parallel to the width direction of the energy storage box (10) are provided with a plurality of positioning holes (123); the plurality of positioning pins (153) correspond to the plurality of positioning holes (123) one by one, and at least a portion of each positioning pin (153) is located in the corresponding positioning hole (123).

13. The energy storage box according to claim 12, characterized in that: A line connecting two of the plurality of positioning holes (123) intersects both the length direction and the width direction of the energy storage box (10).

14. The energy storage box according to claim 1, characterized in that: The top surface of the main body (131) has a third protrusion (134), and the third protrusion (134) extends to two ends of the main body (131); The end plate (15) has a fourth step (152) facing the crossbeam (14), the tread of the fourth step (152) is supported on the upper surface of the third protrusion (134), the kick surface of the fourth step (152) is in contact with the inner surface of the third protrusion (134), and the inner surface of the side plate (122) faces the third protrusion (134) and is fixedly connected to the third protrusion (134).

15. An energy storage device, characterized in that: include: A battery module (20) and an energy storage box (10) according to any one of claims 1 to 14, wherein the battery module (20) is located in a receiving cavity enclosed by the lower box (11) and the box cover (12).

16. An energy storage system, characterized in that: The energy storage system comprises the energy storage device (100) according to claim 15.

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