Battery box and energy storage device

Abstract

The utility model discloses a battery box and an energy storage device, and relates to the technical field of energy storage. The battery box comprises a lower box body, the edge of the bottom of the lower box body is provided with a liquid inlet connector and a liquid outlet connector, and a pair of opposite outer side walls of the lower box body are provided with hanging structures and forking cavities extending in the length direction of the battery box; the top cover is fixedly connected with the lower box body, and a battery bin is defined by the top cover; and the liquid cooling plate is fixed in the battery compartment, the liquid cooling plate is provided with a liquid inlet and a liquid outlet, and the liquid inlet and the liquid outlet are respectively communicated with the liquid inlet joint and the liquid outlet joint. According to the embodiment of the invention, after a plurality of battery modules are accommodated in the battery box with a relatively large volume, the battery box can be forked and lifted based on the forking cavity, the energy storage device can be stably tensioned based on the suspension structure, and the battery box is directly transferred to the mounting frame, so that the transfer difficulty of the battery box is reduced, and the transfer efficiency of the battery box is improved. Meanwhile, the transfer efficiency of the battery box is improved.

Description

Technical Field

[0001] This application relates to the technical field of energy storage, and in particular, to a battery box and an energy storage device. Background Art

[0002] Currently, existing battery packs include a battery box and battery modules installed in the battery box. Against the backdrop of the market's pursuit of high-capacity battery packs, the battery packs are getting larger and larger, that is, the number of battery modules installed in the battery box is increasing, resulting in a corresponding increase in the volume and weight of the battery pack.

[0003] In related technologies, after the assembly of the battery pack is completed, the battery pack needs to be transported to the mounting rack in the prefabricated cabin. For the transportation of the battery pack, it usually includes carrying the battery pack onto a designated transportation tool such as a forklift, and then transferring it to the mounting rack through the designated transportation tool such as a forklift. With the increase in the volume and weight of the battery, the transportation difficulty of the battery pack increases, thus reducing the transportation efficiency of the battery pack. Summary of the Utility Model

[0004] A main object of this application is to provide a battery box and an energy storage device that reduce the transportation difficulty and improve the transportation efficiency.

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

[0006] According to one aspect of this application, a battery box is provided, including: a lower box body, a liquid inlet joint and a liquid outlet joint are arranged at the bottom edge of the lower box body, and a pair of opposite outer side walls of the lower box body both have hanging structures, and a fork loading cavity extending along the length direction of the battery box; a top cover, fixedly connected to the lower box body and enclosing a battery compartment; a liquid cooling plate, fixed in the battery compartment, the liquid cooling plate has a liquid inlet and a liquid outlet, and the liquid inlet and the liquid outlet are respectively communicated with the liquid inlet joint and the liquid outlet joint.

[0007] In the embodiment of this application, for a relatively large battery box, after accommodating multiple battery modules, the battery box can be fork-lifted and lifted based on the fork loading cavity, and the energy storage device can be firmly tightened based on the hanging structure, and the battery box can be directly transported to the mounting rack, thereby reducing the transportation difficulty of the battery box and improving the transportation efficiency of the battery box at the same time.

[0008] According to an embodiment of this application, wherein, the lower box body includes a bottom plate and a circle of side frames surrounding the edge of the bottom plate, and the top cover is fixedly connected to the side frames; the side frames include a front end plate, a rear end plate and a pair of side end plates, the front end plate and the rear end plate are arranged opposite to each other along the length direction of the battery box, the liquid inlet joint and the liquid outlet joint are arranged at the bottom of the front end plate, and the hanging structures and the fork loading cavity are arranged on the outer surfaces of a pair of the side end plates.

[0009] In the embodiments of the present application, for the suspension structure and the forklift cavity provided on the side end plates, it is possible to avoid the collision between the designated transportation tool and the electrical components (such as the battery management module and the electrode connector) on the battery box when transporting the battery box, which is convenient for ensuring the structural integrity of the battery box during transportation.

[0010] According to an embodiment of the present application, on the outer surfaces of a pair of the side end plates, there are convex beams, the length direction of the convex beams is parallel to the length direction of the battery box, and the convex beams have forklift holes with at least one end open, and the forklift holes enclose the forklift cavity.

[0011] In the embodiments of the present application, for the convex beams on the outer surfaces of the side end plates, on the basis of realizing the fork connection and lifting of the lower box body through the forklift holes, the structural strength of the side end plates can also be enhanced based on the convex beams to ensure the structural stability of the lower box body. In addition, since the forklift cavity is enclosed by the forklift holes, the stability of the fork connection and lifting is ensured when the lower box body is fork-connected and lifted, avoiding the risk of the lower box body falling during transportation.

[0012] According to an embodiment of the present application, the convex beams also have hole walls passing through the forklift holes and a plurality of suspension holes distributed at intervals, and the plurality of suspension holes constitute the suspension structure.

[0013] According to an embodiment of the present application, the side end plates and the convex beams are integrally formed extrusion aluminum profiles.

[0014] In the embodiments of the present application, for the integrally formed extrusion aluminum profiles including the side end plates and the convex beams, the connection strength between the convex beams and the side end plates can be ensured, so that when the lower box body is fork-connected and lifted through the forklift cavity on the convex beams, the risk of the convex beams and the side end plates breaking is avoided.

[0015] According to an embodiment of the present application, a plurality of rollers are provided at the bottom of the lower box body and are distributed at intervals along the length direction of the battery box.

[0016] In the embodiments of the present application, through the setting of two sets of rolling mechanisms at the bottom of the lower box body, it is convenient to improve the efficiency of fork connection and lifting through the movement of the battery box when the designated transportation tool fork-connects and lifts the battery box; in addition, when the battery box is transported to the position of the mounting rack and the battery box is pushed to support on the mounting rack, the friction between the bottom of the lower box body and the mounting rack can be reduced based on the contact between the rollers and the mounting rack, so as to extend the service life of the battery box, and at the same time, the resistance when the battery box is pushed in can also be reduced, which is convenient for improving the assembly efficiency and convenience of the battery box assembled on the mounting rack.

[0017] According to an embodiment of the present application, the bottom of the lower box body has a plurality of protrusions facing the surface of the liquid cooling plate. The plurality of protrusions are spaced apart along the width direction of the battery box, and the plurality of protrusions and the inner side wall of the lower box body enclose a plurality of limiting grooves; the liquid cooling plate is supported on the plurality of protrusions. The battery box further includes heat-insulating cotton, and the heat-insulating cotton is located between the bottom of the lower box body and the liquid cooling plate, and each of the limiting grooves has the heat-insulating cotton.

[0018] In the embodiment of the present application, through the arrangement of the heat-insulating cotton, the direct contact between the bottom of the lower box body and the liquid cooling plate is isolated, avoiding the influence of the environment outside the lower box body on the liquid cooling plate, so as to ensure the heat exchange efficiency between the liquid cooling plate and the internal environment of the battery compartment and the battery modules; also, based on the compressibility of the heat-insulating cotton, the expansion buffer of the liquid cooling plate can be realized, avoiding the situation that the flow channels of the liquid cooling plate are squeezed or even the flow channels collapse and break, resulting in the failure of the liquid cooling plate; furthermore, through the arrangement of the limiting grooves, the heat-insulating cotton can be limited to avoid the movement of the heat-insulating cotton in the lower box body; at the same time, due to the existence of the protrusions, there is a gap between adjacent two heat-insulating cottons, so there is an activity space under the extrusion of the liquid cooling plate.

[0019] According to an embodiment of the present application, there is a gap between the liquid cooling plate and the inner side wall of the lower box body, and the gap is filled with an adhesive.

[0020] In the embodiment of the present application, through the arrangement of the gap, the contact between the liquid cooling plate and the inner side wall of the lower box body can be further reduced, thereby avoiding the situation that metal debris is generated due to relative friction between the liquid cooling plate and the lower box body when the liquid cooling plate moves; in addition, after filling the adhesive in the gap between the liquid cooling plate and the inner side wall of the lower box body, the liquid cooling plate can be limited and fixed in the battery compartment to ensure the stability of the fixation of the liquid cooling plate and avoid the situation that the liquid cooling plate moves when the single cells included in the battery module thermally expand.

[0021] According to an embodiment of the present application, the surface of each protrusion has an insulating film layer, and the adhesive is an insulating glue.

[0022] In the embodiment of the present application, through the arrangement of the insulating film layer on the protrusion and the insulating glue between the liquid cooling plate and the inner side wall of the lower box body, the insulation between the liquid cooling plate and the lower box body is effectively ensured, and thus the possibility of the lower box body being electrified is reduced.

[0023] According to an embodiment of the present application, the insulating film layer is an insulating glue layer.

[0024] In the embodiments of the present application, the insulating film layer is set as an insulating glue layer, which can not only insulate between the liquid cooling plate and the bottom plate, but also pre-fix the liquid cooling plate, thus facilitating the connection between the liquid inlet and outlet of the liquid cooling plate and the liquid inlet joint and outlet joint at the bottom of the front plate respectively.

[0025] According to an embodiment of the present application, a surface of the liquid cooling plate facing away from the bottom of the lower box body has a plurality of limiting strips, and the plurality of limiting strips and the inner side wall of the lower box body enclose a plurality of glue grooves; the battery box further includes a heat conducting plate supported on the plurality of limiting strips, and a heat conducting glue located in the glue grooves is accommodated between the heat conducting plate and the liquid cooling plate.

[0026] According to an aspect of the present application, there is provided an energy storage device, including a battery module and the battery box described in the above aspect, and the battery module is located in the battery compartment of the battery box.

[0027] In the embodiments of the present application, for a high-capacity energy storage device, in combination with the battery box described above, the energy storage device can be fork-lifted and lifted based on the fork-loading cavity, and firmly tightened based on the suspension structure, and directly transported to the mounting rack, thereby reducing the transportation difficulty of the energy storage device and improving the transportation efficiency of the energy storage device at the same time.

[0028] 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 THE DRAWINGS

[0029] By referring to the accompanying drawings and describing its exemplary embodiments in detail, the above and other features and advantages of the present application will become more obvious.

[0030] Figure 1 is a schematic diagram of an energy storage system shown according to an exemplary embodiment.

[0031] Figure 2 is an exploded structural schematic diagram of an energy storage device shown according to an exemplary embodiment.

[0032] Figure 3 is a top-down axonometric exploded structural schematic diagram of a battery box shown according to an exemplary embodiment.

[0033] Figure 4 is a top-down structural schematic diagram of a lower box body shown according to an exemplary embodiment.

[0034] Figure 5 is a bottom-up axonometric exploded structural schematic diagram of a battery box shown according to an exemplary embodiment.

[0035] Figure 6It is an exploded schematic diagram of a lower box body shown according to an exemplary embodiment.

[0036] Figure 7 is Figure 4 A schematic cross-sectional structure diagram of the lower box body shown along the O-O` direction.

[0037] Figure 8 is Figure 7 An enlarged schematic diagram of the A area shown.

[0038] Figure 9 is Figure 7 An enlarged schematic diagram of the B area shown.

[0039] Among them, the description of the reference numerals is as follows:

[0040] 100, energy storage device; 200, power conversion device; 300, user load;

[0041] 10, battery box; 20, battery module;

[0042] 1, lower box body; 2, top cover; 3, battery compartment; 4, liquid cooling plate; 5, thermal insulation cotton; 6, heat conduction plate; 7, thermal conductive adhesive;

[0043] 11, liquid inlet joint; 12, liquid outlet joint; 13, suspension structure; 14, forklift cavity; 15, roller; 16, bottom plate; 17, frame;

[0044] 161, protrusion; 162, limit groove; 163, insulating film layer; 164, first partition; 165, second partition;

[0045] 171, front end plate; 172, rear end plate; 173, side end plate; 174, outer surface; 175, convex beam;

[0046] 1751, forklift hole; 1752, suspension hole;

[0047] 31, gap; 32, adhesive; 33, limit strip; 34, glue groove. Specific embodiments

[0048] Now, the exemplary embodiments will be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be thorough and complete, and the concept of the exemplary embodiments will be fully conveyed to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed descriptions will be omitted.

[0049] Since the energy required by people has strong temporality and spatiality, in order to rationally utilize energy and improve the utilization rate, it is necessary to store one form of energy in the same form of energy or convert it into another form of energy through a medium or device, and then release it in a specific form of energy based on future applications.

[0050] Currently, green energy mainly includes light energy, wind energy, etc. However, light energy, wind energy, etc. 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 electricity consumption and too much electricity during low electricity consumption). The unstable voltage will damage the electricity, so the problem of "abandoning wind and light" may be caused due to insufficient electricity demand or insufficient grid acceptance capacity.

[0051] To solve the problems of insufficient electricity demand or insufficient grid acceptance capacity, it is necessary to rely on the energy storage device 100. That is, through the energy storage device 100, electrical energy is converted into other forms of energy through physical or chemical means and stored. When needed, the energy stored in the energy storage device 100 is converted back into electrical energy and released. Simply put, the energy storage device 100 is similar to a large "portable charger", which stores electrical energy when light energy and wind energy are sufficient and releases the stored electrical energy when needed.

[0052] Currently, the application scenarios of energy storage (i.e., energy storage) are relatively wide, including power generation side energy storage, grid side energy storage, renewable energy grid connection energy storage, and user side energy storage, etc. The corresponding types of the energy storage device 100 include:

[0053] (1) The large energy storage container applied to the grid side energy storage scenario can be used as a high-quality active and reactive power regulation power source in the grid, realizing the load matching of electrical energy in time and space, enhancing the consumption capacity of renewable energy, and being of great significance in the grid system standby, alleviating the power supply pressure during peak loads, and peak shaving and frequency modulation;

[0054] (2) The small and medium-sized energy storage cabinets applied to the industrial and commercial energy storage scenarios (such as banks, shopping malls, etc.) on the user side and the household small energy storage boxes applied to the household energy storage scenarios on the user side mainly operate in the mode of "peak shaving and valley filling". Since there is a large price difference in electricity charges at the peak and valley positions according to the electricity consumption demand, after users have energy storage devices, in order to reduce costs, they usually charge the energy storage device 100 (energy storage cabinet / box) during the low electricity price period; during the high electricity price period, the electricity in the energy storage device 100 is released for use to achieve the purpose of saving electricity charges. In addition, in remote areas and areas with high incidences of natural disasters such as earthquakes and hurricanes, the existence of the household energy storage device 100 is equivalent to providing a backup power source for users and the grid, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0055] Taking the outdoor energy storage scenario in grid side energy storage as an example,Figure 1 FIG. 0 is a schematic diagram of an energy storage system provided by an embodiment of the present application. The energy storage system includes an energy storage device 100, a power conversion device 200, and a user load 300. The power 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, other forms of energy such as solar energy and wind energy can be converted into electrical energy through the power conversion device 200 and stored through the energy storage device 100. Then, during the peak electricity price period, the energy storage device 100 supplies the user load 300 for use, or during a power grid power outage, the energy storage device 100 supplies the user load 300 for use.

[0056] In combination with the above-mentioned situation of 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. The chemical elements in the chemical battery are used as the energy storage medium to realize the charge and discharge process through the chemical reaction or change of the energy storage medium. Simply put, the electrical energy generated by light energy and wind energy is stored in at least one group of chemical batteries through the chemical reaction or change of the energy storage medium, and when the use of external electrical energy reaches the peak, the electrical energy stored in at least one group of chemical batteries is released through the chemical reaction or change of the energy storage medium for use, or transferred to places with a shortage of electricity for reuse.

[0057] An embodiment of the present application provides an energy storage device 100, which can be a battery pack, a battery box 10, a battery system, etc. composed of single cells. The single cell can be a lithium-ion secondary battery, a lithium-sulfur battery, a sodium-lithium ion battery, a sodium ion battery, a magnesium ion battery, etc., and the single cell can be in a cylindrical shape, a flat shape, a cuboid shape, etc. The embodiment of the present application does not limit this.

[0058] In some embodiments, as Figure 2 shown, the energy storage device 100 includes a battery module 20 and a battery box 10. The battery box 10 has a sealed battery compartment 3, and the battery module 20 is located in the battery compartment 3.

[0059] Among them, the battery module 20 includes a plurality of single cells connected in series and parallel, and the plurality of single cells are arranged along the length direction Y of the battery box 10. The number of battery modules 20 accommodated in the battery compartment 3 of the battery box 10 can be 4, 6, 8, etc. The more the number of battery modules 20, the higher the capacity of the energy storage device 100, and thus it is easier to meet the market demand. For example, as Figure 2 shown, there are 2 rows along the length direction Y of the battery box 10 and 4 columns of battery modules 20 along the width direction X of the battery box 10 in the battery compartment 3 of the battery box 10, that is, there are 8 battery modules 20 accommodated in the battery compartment 3.

[0060] In some embodiments, as Figure 3 shown, the battery box 10 includes a lower box body 1 and a top cover 2. A pair of opposite outer side walls of the lower box body 1 each have a suspension structure 13 and a fork-loading cavity 14 extending along the length direction Y of the battery box 10; the top cover 2 is fixedly connected to the lower box body 1 and encloses a battery compartment 3 (not shown in the figure).

[0061] Thus, for a relatively large battery box 10, after accommodating a plurality of battery modules 20, based on the suspension structure 13 and the fork-loading cavity 14, a designated transportation tool such as a forklift can be used to achieve stable transportation of the battery box 10. That is, the battery box 10 is fork-lifted and supported based on the fork-loading cavity 14, and the battery box 10 is firmly tightened based on the suspension structure 13, and the battery box 10 is directly transported to the mounting rack, thereby reducing the transportation difficulty of the battery box 10 and improving the transportation efficiency of the battery box 10.

[0062] Wherein, the planes where the pair of outer side walls of the lower box body 1 are located are each parallel to the length direction Y of the battery box 10, so as to ensure that the length direction Y of the fork-loading cavity 14 on the pair of outer side walls of the lower box body 1 can be parallel to the length direction Y of the battery box 10. Of course, the length direction Y of the fork-loading cavity 14 on the pair of outer side walls of the lower box body 1 can also form a certain angle with the length direction Y of the battery box 10, as long as it can ensure that the length direction Y of the fork-loading cavity 14 on the pair of outer side walls is parallel, and the designated transportation tool can fork-lift and support the battery box 10 based on the fork-loading cavity 14.

[0063] In some embodiments, as Figure 3 shown, the lower box body 1 includes a bottom plate 16 (not shown in the figure) and a surrounding frame 17 around the edge of the bottom plate 16, and the top cover 2 is fixedly connected to the frame 17.

[0064] Wherein, as Figure 3 shown, the frame 17 includes a front end plate 171, a rear end plate 172 and a pair of side end plates 173. The front end plate 171 and the rear end plate 172 are opposite and parallel to each other in the length direction Y of the battery box 10, and the pair of side end plates 173 are opposite and parallel to each other in the width direction X of the battery box 10.

[0065] Wherein, as Figure 4 shown, a first partition 164 is provided at the bottom of the lower box body 1. The length direction Y of the first partition 164 is parallel to the width direction X of the battery box 10, so as to separate the battery compartment 3 in the battery box 10 through the cooperation of the first partition 164 and the rear end plate 172, and at the same time limit the battery modules 20 in the battery compartment 3 to avoid interference between the battery modules 20 and the electrical components (such as the battery management module, etc.) fixed on the front end plate 171.

[0066] Optionally, as Figure 4As shown, a second partition 165 is further provided at the bottom of the lower box body 1 and is arranged in the battery compartment 3 and side by side with the first partition 164, so as to divide the battery compartment 3 into a plurality of sub-compartments distributed along the length direction Y of the battery box 10 through the second partition 165, thereby facilitating the arrangement of multiple columns of battery modules 20 in the plurality of sub-compartments respectively, so as to realize the assembly of multiple rows and multiple columns of battery modules 20 in the battery compartment 3, and thus achieve the high-capacity effect of the energy storage device 100.

[0067] Combined with the specific structure of the lower box body 1, for the suspension structure 13 and the forklift cavity 14 provided on the outer side wall of the lower box body 1, it can be that the suspension structure 13 and the forklift cavity 14 are provided at both edge portions of the bottom plate 16 close to a pair of side end plates 173; it can also be that the suspension structure 13 and the forklift cavity 14 are provided on the outer surface 174 of a pair of side end plates 173; it can also be that one of the suspension structure 13 and the forklift cavity 14 is provided at both edge portions of the bottom plate 16 close to a pair of side end plates 173, and the other of the suspension structure 13 and the forklift cavity 14 is provided on the outer surface 174 of a pair of side end plates 173.

[0068] Among them, when the suspension structure 13 and / or the forklift cavity 14 is provided at the edge portion of the bottom plate 16 close to the side end plate 173, in order not to affect the fixed connection between the bottom plate 16 and the side end plate 173, the side end plate 173 can be supported on the upper surface of the bottom plate 16 to ensure that the suspension structure 13 and / or the forklift cavity 14 on the bottom plate 16 protrudes from the side end plate 173, so as to facilitate the fork connection, lifting and suspension tensioning of the battery box 10. When the suspension structure 13 and the forklift cavity 14 are both provided on the outer surface 174 of the side end plate 173, the suspension structure 13 and the forklift cavity 14 can be respectively arranged at both edge portions of the side end plate 173 along the height direction of the battery box 10, or the suspension structure 13 and the forklift cavity 14 can be arranged at the same side edge portion of the side end plate 173 along the height direction of the battery box 10.

[0069] Exemplarily, as Figure 3 shown, the suspension structure 13 and the forklift cavity 14 are provided on the outer surface 174 of the side end plate 173 and are located on the side of the side end plate 173 close to the bottom plate 16 along the height direction of the battery box 10. For the suspension structure 13 and the forklift cavity 14 provided on the side end plate 173, it can avoid the collision between the specified transportation tool and the electrical components (such as the battery management module and the electrode connector) on the battery box 10 during the transportation of the battery box 10, and is convenient for ensuring the structural integrity of the battery box 10 during the transportation process.

[0070] Next, taking the example that both the suspension structure 13 and the forklift cavity 14 are located on the outer surface 174 of the side end plate 173, a detailed explanation will be given.

[0071] In some embodiments, as Figure 3 or Figure 5As shown, convex beams 175 are provided on the outer surfaces 174 of the side end plates 173. The length direction of the convex beams 175 is parallel to the length direction Y of the battery box 10, and the convex beams 175 have fork holes 1751 with at least one open end. The fork holes 1751 enclose a fork cavity 14.

[0072] Thus, for the convex beams 175 on the outer surfaces 174 of the side end plates 173, on the basis of realizing the fork-lifting support for the lower box body 1 through the fork holes 1751, the structural strength of the side end plates 173 can also be enhanced based on the convex beams 175 to ensure the structural stability of the lower box body 1. In addition, since the fork cavity 14 is enclosed by the fork holes 1751, the stability of the fork-lifting support is ensured when the lower box body 1 is fork-lifted, avoiding the risk of the lower box body 1 falling during transportation.

[0073] Among them, for the convex beams 175 provided on the outer surfaces 174 of the side end plates 173, they can be fixed on the outer surfaces 174 of the side end plates 173 by welding, or the side end plates 173 and the convex beams 175 can be an integral structure (such as an integral extruded aluminum profile). For the integral structure including the side end plates 173 and the convex beams 175, the connection strength between the convex beams 175 and the side end plates 173 can be ensured, so as to avoid the risk of the convex beams 175 and the side end plates 173 breaking when the lower box body 1 is fork-lifted through the fork cavity 14 on the convex beams 175.

[0074] Optionally, as Figure 3 or Figure 5 shown, the convex beams 175 also have hole walls penetrating the fork holes 1751 and a plurality of suspension holes 1752 distributed at intervals. The plurality of suspension holes 1752 constitute a suspension structure 13. Thus, while the fork holes 1751 are provided on the convex beams 175, a plurality of suspension holes 1752 are provided based on the fork holes 1751 to simplify the structure of the lower box body 1.

[0075] It should be noted that in this application, in addition to forming the fork cavity 14 on the convex beams 175 by providing the convex beams 175 on the outer surfaces 174 of the side end plates 173, the fork cavity 14 can also be directly formed at the edge of the side end plates 173 close to the bottom plate 16. For example, the edge of the side end plate 173 close to the bottom plate 16 has a rectangular chamfer, and the fork cavity 14 is enclosed by the chamfered surface of the rectangular chamfer. In addition, in this application, in addition to forming the suspension structure 13 by providing the suspension holes 1752 on the convex beams 175, convex columns can also be provided on the outer surfaces 174 of the side end plates 173 to form the suspension structure 13, etc. The embodiments of this application do not limit this.

[0076] In some embodiments, as Figure 5 shown, a plurality of rollers 15 are provided at the bottom of the lower box body 1 and are distributed at intervals along the length direction Y of the battery box 10.

[0077] In this way, through the setting of the upper rollers 15 at the bottom of the lower box body 1, it is convenient for the lower box body 1 to move when being fork-lifted by a designated transport vehicle, so as to improve the efficiency of fork-lifting; in addition, when the lower box body 1 is transported to the position of the mounting rack and the lower box body 1 is pushed to support on the mounting rack, based on the contact between the rollers 15 and the mounting rack, the friction between the bottom of the lower box body 1 and the mounting rack can be reduced, so as to extend the service life of the lower box body 1. At the same time, the resistance when the lower box body 1 is pushed in can also be reduced, which is convenient for improving the assembly efficiency and convenience of the lower box body 1 assembled on the mounting rack.

[0078] Among them, combined with the specific structure of the lower box body 1 described above, at least two groups of rollers 15 can be arranged at the bottom of the lower box body 1, so that when the battery box 10 is installed on the mounting rack, the two groups of rollers 15 can respectively support on the two guide rails of the mounting rack. In addition, the rollers 15 can be arranged on the lower surface of the bottom plate 16, or can be arranged at the edge of the first opening end of the frame 17. For example, combined with the situation that the convex beam 175 is arranged at the edge of the side end plate 173 of the frame 17 close to the bottom plate 16 as Figure 5 shown, a plurality of rollers are spaced apart and distributed on the bottom surface of the convex beam 175, so as to ensure that after the lower box body 1 is transported to the mounting rack, the rollers 15 at the bottom of the lower box body 1 can support on the mounting rack.

[0079] In some embodiments, as Figure 3 and Figure 6 shown, the battery box 10 further includes a liquid cooling plate 4, the liquid cooling plate 4 is fixed in the battery compartment 3, the liquid cooling plate 4 has a liquid inlet (not shown in the figure) and a liquid outlet (not shown in the figure). Correspondingly, the bottom edge of the lower box body 1 included in the battery box 10 is provided with a liquid inlet joint 11 and a liquid outlet joint 12, and the liquid inlet and liquid outlet of the liquid cooling plate 4 are respectively communicated with the liquid inlet joint 11 and the liquid outlet joint 12 at the bottom of the lower box body 1.

[0080] In this way, through the setting of the liquid cooling plate 4, when the internal environment temperature of the battery compartment 3 is too high, it is convenient to introduce the coolant along the liquid inlet joint 11, so that after the coolant flows through the flow channels on the liquid cooling plate 4, heat exchange is carried out with the internal environment of the battery compartment 3 and the battery module 20 to realize the cooling of the internal environment; when the internal environment temperature of the battery compartment 3 is too low, warm fluid can also be introduced along the liquid inlet joint 11, so that after the warm fluid flows through the flow channels on the liquid cooling plate 4, heat exchange is carried out with the internal environment of the battery compartment 3 and the battery module 20 to realize the heating of the internal environment, thereby ensuring that the battery module 20 is charged and discharged at an appropriate ambient temperature, so as to ensure the charge and discharge performance of the battery module 20, and at the same time avoid potential safety hazards brought by the high temperature environment or low temperature environment to the battery module 20.

[0081] Among them, in combination with the specific structure of the lower box body 1 described above, the liquid inlet joint 11 and the liquid outlet joint 12 provided at the bottom edge position of the lower box body 1 can be arranged at the bottom of the front end plate 171, that is, as Figure 5 shown, the liquid inlet joint 11 and the liquid outlet joint 12 are arranged at the bottom of the front end plate 171.

[0082] In some embodiments, as Figure 6 shown, the battery box 10 further includes a heat insulating cotton 5, and the heat insulating cotton 5 is located between the bottom of the lower box body 1 (i.e., the bottom plate 16) and the liquid cooling plate 4.

[0083] In this way, through the arrangement of the heat insulating cotton 5, the direct contact between the bottom of the lower box body 1 and the liquid cooling plate 4 is isolated, and the influence of the environment outside the lower box body 1 on the liquid cooling plate 4 is avoided, so as to ensure the heat exchange efficiency between the liquid cooling plate 4 and the internal environment of the battery compartment 3 and the battery module 20; at the same time, the contact area between the liquid cooling plate 4 and the lower box body 1 can be reduced to avoid the situation of relative friction between the liquid cooling plate 4 and the lower box body 1 when the liquid cooling plate 4 moves, generating metal debris, and ensuring the safety of the energy storage device 100 during the charging and discharging process; furthermore, based on the compressibility of the heat insulating cotton 5, the expansion buffer of the liquid cooling plate 4 can be realized, and the situation that the flow channel of the liquid cooling plate 4 is squeezed or even the flow channel collapses and breaks, resulting in the failure of the liquid cooling plate 4, can be avoided.

[0084] Optionally, as Figure 6 shown, the surface of the bottom of the lower box body 1 (i.e., the bottom plate 16) facing the liquid cooling plate 4 has a plurality of protrusions 161, the plurality of protrusions 161 are spaced apart along the width direction X of the battery box 10, and the plurality of protrusions 161 and the inner side wall of the lower box body 1 enclose a plurality of limiting grooves 162, and each limiting groove 162 is provided with a heat insulating cotton 5.

[0085] In this way, through the arrangement of the limiting grooves 162, the limiting of the heat insulating cotton 5 is realized, and the movement of the heat insulating cotton 5 in the lower box body 1 is avoided; at the same time, due to the existence of the protrusions 161, there is a gap 31 between two adjacent heat insulating cottons 5, so there is a moving space under the extrusion of the liquid cooling plate 4.

[0086] Of course, in addition to providing the protrusions 161 on the upper surface of the bottom plate 16 to form the limiting grooves 162 for limiting the heat insulating cotton 5, the heat insulating cotton 5 can also be directly adhered to the upper surface of the bottom plate 16 through an adhesive 32 or the like, as long as the positioning of the heat insulating cotton 5 can be realized.

[0087] Optionally, as Figure 7 and Figure 8 shown, there is a gap 31 between the liquid cooling plate 4 and the inner side wall of the lower box body 1, and the gap 31 is filled with an adhesive 32.

[0088] Thus, through the setting of the gap 31, the contact between the liquid cooling plate 4 and the inner side wall of the lower box body 1 can be further reduced, thereby avoiding the situation of generating metal debris due to relative friction between the liquid cooling plate 4 and the lower box body 1 when the liquid cooling plate 4 moves; in addition, after filling the adhesive 32 in the gap 31 between the liquid cooling plate 4 and the inner side wall of the lower box body 1, the liquid cooling plate 4 can be limited and fixed in the battery compartment 3 to ensure the stability of the fixation of the liquid cooling plate 4 and avoid the situation that the liquid cooling plate 4 is driven to move when the single battery included in the battery module 20 undergoes thermal expansion.

[0089] Optionally, as Figure 7 and Figure 9 shown, the surface of each protrusion 161 has an insulating film layer 163, and the adhesive 32 is an insulating glue. Thus, through the setting of the insulating film layer 163 on the protrusion 161 and the setting of the insulating glue between the liquid cooling plate 4 and the inner side wall of the lower box body 1, the insulation between the liquid cooling plate 4 and the lower box body 1 is effectively ensured, thereby reducing the possibility of the lower box body 1 being electrified.

[0090] Among them, the insulating film layer 163 can be an insulating coating or an insulating glue layer. When the insulating film layer 163 is an insulating glue layer, it can not only realize the insulation between the liquid cooling plate 4 and the bottom plate 16, but also realize the pre-fixation of the liquid cooling plate 4, thus facilitating the connection of the liquid inlet and outlet of the liquid cooling plate 4 with the liquid inlet joint 11 and the liquid outlet joint 12 at the bottom of the front end plate 171 respectively.

[0091] In some embodiments, as Figure 7 and Figure 9 shown, the battery box 10 further includes a heat conducting plate 6 on the side of the liquid cooling plate 4 away from the bottom (bottom plate 16) of the lower box body 1, and a heat conducting glue 7 is accommodated between the heat conducting plate 6 and the liquid cooling plate 4. Thus, through the setting of the heat conducting plate 6, the heat exchange efficiency between the liquid cooling plate 4 and the internal environment of the battery compartment 3 and the battery module 20 is improved.

[0092] Optionally, as Figure 7 and Figure 9 shown, the surface of the bottom of the liquid cooling plate 4 facing away from the lower box body 1 has a plurality of limiting strips 33, and the plurality of limiting strips 33 and the inner side wall of the lower box body 1 enclose a plurality of glue grooves 34, and a heat conducting glue 7 is provided in each of the plurality of glue grooves 34. Thus, through the setting of the limiting strips 33, it is convenient to apply the heat conducting glue 7 on the liquid cooling plate 4, and at the same time, the overflow of the heat conducting glue 7 is avoided, thereby avoiding the heat transfer between the liquid cooling plate 4 and the inner side wall of the lower box body 1.

[0093] In the embodiments of the present application, the terms "first", "second", and "third" are used only for descriptive purposes and cannot be construed as indicating or implying relative importance; the term "plural" means two or more, unless otherwise clearly defined. Terms such as "installed", "connected", "joined", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "joined" 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 specific circumstances.

[0094] In the description of the embodiments of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the embodiments of the present application.

[0095] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0096] The above are only the preferred embodiments of the embodiments of the present application and are not used to limit the embodiments of the present application. For those skilled in the art, the embodiments of the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present application shall be included in the protection scope of the embodiments of the present application.

Claims

1. A battery box, characterized in that, Comprising: A lower box body (1), a liquid inlet joint (11) and a liquid outlet joint (12) are arranged at the bottom edge of the lower box body (1), and a pair of opposite outer side walls of the lower box body (1) both have a suspension structure (13), and a forklift cavity (14) extending along the length direction of the battery box (10); A top cover (2), fixedly connected to the lower box body (1) and enclosing a battery compartment (3); A liquid cooling plate (4), fixed in the battery compartment (3), the liquid cooling plate (4) has a liquid inlet and a liquid outlet, and the liquid inlet and the liquid outlet are respectively communicated with the liquid inlet joint (11) and the liquid outlet joint (12).

2. The battery box according to claim 1, wherein, The lower box body (1) includes a bottom plate (16) and a circle of side frames (17) surrounding the edge of the bottom plate (16), and the top cover (2) is fixedly connected to the side frames (17); The side frames (17) include a front end plate (171), a rear end plate (172) and a pair of side end plates (173), the front end plate (171) and the rear end plate (172) are arranged opposite to each other along the length direction of the battery box (10), the liquid inlet joint (11) and the liquid outlet joint (12) are arranged at the bottom of the front end plate (171), and the suspension structure (13) and the forklift cavity (14) are arranged on the outer surface (174) of a pair of the side end plates (173).

3. The battery box according to claim 2, characterized in that, The outer surface (174) of a pair of the side end plates (173) both has a convex beam (175), the length direction of the convex beam (175) is parallel to the length direction of the battery box (10), and the convex beam (175) has a forklift hole (1751) with at least one end open, and the forklift hole (1751) encloses the forklift cavity (14).

4. The battery box according to claim 3, wherein The convex beam (175) also has a hole wall penetrating through the forklift hole (1751) and a plurality of suspension holes (1752) distributed at intervals, and the plurality of suspension holes (1752) constitute the suspension structure (13).

5. The battery box according to claim 3, characterized in that, The side end plate (173) and the convex beam (175) are an integral extruded aluminum profile.

6. The battery box according to claim 1, wherein A plurality of rollers (15) are arranged at the bottom of the lower box body (1) at intervals along the length direction of the battery box (10).

7. The battery box according to claim 1, characterized in that, The surface of the bottom of the lower box body (1) facing the liquid cooling plate (4) has a plurality of protrusions (161), the plurality of protrusions (161) are distributed at intervals along the width direction of the battery box (10), and the plurality of protrusions (161) and the inner side wall of the lower box body (1) enclose a plurality of limiting grooves (162); The liquid cooling plate (4) is supported on the plurality of protrusions (161), the battery box (10) further includes a heat insulating cotton (5), the heat insulating cotton (5) is located between the bottom of the lower box body (1) and the liquid cooling plate (4), and the heat insulating cotton (5) is in each of the limiting grooves (162).

8. The battery box according to claim 7, characterized in that, There is a gap (31) between the edge of the liquid cooling plate (4) and the inner side wall of the lower box body (1), and an adhesive (32) is filled in the gap (31).

9. The battery box according to claim 8, wherein, The surface of each of the protrusions (161) has an insulating film layer (163), and the adhesive (32) is an insulating glue.

10. The battery box according to claim 9, characterized in that, The insulating film layer (163) is an insulating glue layer.

11. The battery box according to any one of claims 1-10, characterized in that, The surface of the liquid cooling plate (4) facing away from the bottom of the lower box body (1) has a plurality of limiting strips (33), and the plurality of limiting strips (33) and the inner side wall of the lower box body (1) enclose a plurality of glue grooves (34); The battery box (10) further includes a heat conducting plate (6) supported on the plurality of limiting strips (33), and a heat conducting glue (7) located in the glue groove (34) is accommodated between the heat conducting plate (6) and the liquid cooling plate (4).

12. An energy storage device, characterized in that, It includes a battery module (20) and the battery box (10) according to any one of claims 1-11, and the battery module (20) is located in the battery compartment (3) of the battery box (10).

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