Battery case and energy storage device

Abstract

The present application relates to the technical field of energy storage, and discloses a battery case and an energy storage device. The battery case comprises: a lower case body, the bottom edge of the lower case body being provided with a liquid inlet connector and a liquid outlet connector, and a pair of opposite outer side walls on the lower case body being each provided with a suspension structure, and a fork pocket extending in the length direction of the battery case; a top cover, fixedly connected to the lower case body and thus defining a battery compartment; and a liquid cooling plate, fixed in the battery compartment, wherein 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 connector and the liquid outlet connector. In embodiments of the present application, for a large-sized battery case, after a plurality of battery modules are accommodated, fork lifting of the battery case can be achieved on the basis of fork pockets, the energy storage device is securely held on the basis of suspension structures, and the battery case is directly transferred to a mounting frame, thereby reducing the difficulty of transferring the battery case, and improving the transfer efficiency of the battery case.

Description

Battery box and energy storage device

[0001] Cross-reference to related applications

[0002] The present disclosure claims priority to the Chinese patent application No. 202422013038.4 filed on August 16, 2024, entitled “Battery box and energy storage device”, the entire contents of which are incorporated herein by reference in its entirety. TECHNICAL FIELD

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

[0004] The existing battery pack currently includes a battery box and a battery module installed in the battery box. In the context of the market pursuing high-capacity trends of battery packs, the battery pack is getting larger and larger, i.e., the number of battery modules installed in the battery box is increasing, thereby causing the volume and weight of the battery pack to also increase accordingly.

[0005] In the related art, 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 to a designated transport tool such as a forklift, and then transferring to the mounting rack by the designated transport tool. With the increase of the volume and weight of the battery, the transportation difficulty of the battery pack is increased, thereby reducing the transportation efficiency of the battery pack. SUMMARY

[0006] One main purpose of the present application is to provide a battery box and an energy storage device.

[0007] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0008] According to one aspect of the present application, a battery box is provided, comprising: a lower box body, the bottom edge of the lower box body is provided with a liquid inlet joint and a liquid outlet joint, and a pair of opposite outer side walls of the lower box body each has a suspension structure, and a forklift cavity extending along the length direction of the battery box; a top cover fixedly connected with the lower box body and surrounding a battery compartment; a liquid cooling plate fixed in the battery compartment, the liquid cooling plate has a liquid inlet and a liquid outlet, the liquid inlet and the liquid outlet are in communication with the liquid inlet joint and the liquid outlet joint, respectively.

[0009] In the present application, for a battery box with a large volume, after accommodating a plurality of battery modules, the forklift cavity can be used to fork and lift the battery box, the suspension structure can be used to stably tighten the energy storage device, 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.

[0010] According to an aspect of the present application, there is provided an energy storage device, comprising a battery module and the battery box according to the aspect described above, wherein the battery module is located in the battery compartment of the battery box.

[0011] In the embodiments of the present application, for the high-capacity energy storage device, the fork loading cavity can be used to fork and lift the energy storage device, the suspension structure can be used to stabilize and tighten the energy storage device, and the energy storage device can be directly transferred to the mounting rack, thereby reducing the difficulty of transferring the energy storage device and improving the transfer efficiency of the energy storage device.

[0012] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and are not limiting to the present application. BRIEF DESCRIPTION OF DRAWINGS

[0013] The above and other features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

[0014] FIG. 1 is a schematic diagram of an energy storage system according to an exemplary embodiment.

[0015] FIG. 2 is an exploded structural schematic diagram of an energy storage device according to an exemplary embodiment.

[0016] FIG. 3 is a top view of an exploded structural schematic diagram of a battery box according to an exemplary embodiment.

[0017] FIG. 4 is a top view of a structural schematic diagram of a lower box according to an exemplary embodiment.

[0018] FIG. 5 is a bottom view of an exploded structural schematic diagram of a battery box according to an exemplary embodiment.

[0019] FIG. 6 is an exploded structural schematic diagram of a lower box according to an exemplary embodiment.

[0020] FIG. 7 is a sectional structural schematic diagram of the lower box shown in FIG. 4 along the direction of O-O'.

[0021] FIG. 8 is an enlarged structural schematic diagram of region A shown in FIG. 7.

[0022] FIG. 9 is an enlarged structural schematic diagram of region B shown in FIG. 7.

[0023] Wherein, the reference signs are explained as follows: 100, energy storage device; 200, electric energy conversion device; 300, user load; 10, battery box; 20, battery module; 1, lower box body; 2, top cover; 3, battery compartment; 4, liquid cooling plate; 5, thermal insulation cotton; 6, heat conduction plate; 7, heat conduction adhesive; 11, liquid inlet connector; 12, liquid outlet connector; 13, suspension structure; 14, fork loading cavity; 15, roller; 16, bottom plate; 17, frame; 161, protrusion; 162, limiting groove; 163, insulating film layer; 164, first partition; 165, second partition; 171, front end plate; 172, rear end plate; 173, side end plate; 174, outer surface; 175, convex beam; 1751, fork loading hole; 1752, suspension hole; 31, gap; 32, adhesive; 33, limiting strip; 34, adhesive groove. DETAILED DESCRIPTION

[0024] Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments, however, can be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. Like reference numerals refer to like elements throughout the figures, and thus a detailed description of them will not be repeated.

[0025] Since the energy required by people has strong time and space, in order to reasonably use energy and improve utilization, it is necessary to store one energy form into the same energy form or convert into another energy form through a medium or device, and then release it in a specific energy form based on future application.

[0026] At present, green energy mainly includes light energy, wind energy, etc., and light energy and wind energy have the problems of strong intermittency and large fluctuation, which will cause the voltage instability of green power grid (not enough electricity at peak electricity consumption, and too much electricity at low electricity consumption), and the unstable voltage will cause damage to electricity, so it may cause the problem of "abandoning wind and light" due to insufficient electricity demand or insufficient grid accommodation capacity.

[0027] In order to solve the problem of insufficient electricity demand or insufficient grid accommodation capacity, it is necessary to rely on energy storage device 100. That is, through energy storage device 100, the electric energy is converted into other forms of energy by physical or chemical means, and when needed, the energy stored in energy storage device 100 is converted into electric energy and released. In short, energy storage device 100 is similar to a large "power bank", which stores electric energy when light energy and wind energy are sufficient, and releases the stored electric energy when needed.

[0028] Current energy storage applications are widely used, including power generation side energy storage, power grid side energy storage, renewable energy grid-connected energy storage, and user side energy storage. The corresponding types of energy storage devices 100 include:

[0029] (1) Large energy storage containers used in power grid side energy storage scenarios, which can be used as high-quality active and reactive power regulation power sources in the power grid, to realize load matching in time and space, enhance renewable energy consumption capacity, and have great significance in power grid system backup, relieving peak load power supply pressure, and peak regulation;

[0030] (2) Small and medium-sized energy storage cabinets used in industrial and commercial energy storage scenarios (banks, shopping malls, etc.) and small household energy storage boxes used in household energy storage scenarios, the main operation mode of which is "peak clipping and valley filling". Due to the large price difference between peak and valley electricity prices, users usually charge the energy storage device 100 (energy storage cabinet / box) during the low electricity price period to reduce costs. During the high electricity price period, the electricity in the energy storage device 100 is discharged for use to achieve the purpose of saving electricity costs. In addition, in remote areas and areas prone to natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices 100 is equivalent to the user providing a backup power source for himself and the power grid, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0031] Taking the outdoor energy storage scenario in the power grid side energy storage as an example, FIG. 1 illustrates a schematic diagram of an energy storage system provided by the embodiments of the present application, which includes an energy storage device 100, an electric energy conversion device 200, and a user load 300. The electric energy conversion device 200 (including a solar energy conversion device, a wind energy conversion device) is electrically connected 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, and other forms of energy can be converted into electric energy by the electric energy conversion device 200, and stored by the energy storage device 100. Then, the energy storage device 100 can supply the user load 300 for use during the peak electricity price period, or supply the user load 300 for use when the power grid is disconnected / power off.

[0032] In the case 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, which uses chemical elements in the chemical battery as an energy storage medium to realize the charging and discharging process through chemical reactions or changes of the energy storage medium. In short, the electrical energy generated by light energy or wind energy is stored in at least one set of chemical batteries through chemical reactions or changes of the energy storage medium. When the use of external electrical energy reaches a peak, the electrical energy stored in the at least one set of chemical batteries is released and used through chemical reactions or changes of the energy storage medium, or is transferred to a place where electrical energy is in short supply for use.

[0033] The energy storage device 100 according to the embodiments of the present application can be a battery pack, a battery box 10, a battery system, etc. composed of single batteries. The single batteries can be lithium ion secondary batteries, lithium-sulfur batteries, sodium lithium ion batteries, sodium ion batteries, magnesium ion batteries, etc. The single batteries can be in the shape of a cylinder, a flat body, a cuboid, etc., which are not limited in the embodiments of the present application.

[0034] In some embodiments, as shown in FIG. 2, the energy storage device 100 includes the battery module 20 and the battery box 10, and the battery box 10 has a sealed battery compartment 3, and the battery module 20 is located in the battery compartment 3.

[0035] The battery module 20 includes a plurality of single batteries connected in series and in parallel, and the plurality of single batteries are arranged along the length direction Y of the battery box 10. The battery module 20 accommodated in the battery compartment 3 of the battery box 10 can be 4, 6, 8, etc., and the more the number of the battery module 20, the higher the capacity of the energy storage device 100, so as to more easily meet the market demand. For example, as shown in FIG. 2, the battery compartment 3 of the battery box 10 accommodates 2 rows of battery modules 20 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, that is, the battery compartment 3 accommodates 8 battery modules 20.

[0036] In some embodiments, as shown in FIG. 3, the battery box 10 includes the lower box body 1 and the top cover 2, and each of the pair of outer side walls opposite to each other on the lower box body 1 has a hanging structure 13 and a forklift cavity 14 extending along the length direction Y of the battery box 10; the top cover 2 is fixedly connected with the lower box body 1, and surrounds the battery compartment 3 (not shown in the figure).

[0037] In this way, for the battery box 10 with a large volume, after accommodating a plurality of battery modules 20, the stable transportation of the battery box 10 can be realized by the forklift and other designated transportation tools based on the hanging structure 13 and the forklift cavity 14, that is, the forking and lifting of the battery box 10 is realized based on the forklift cavity 14, the stable tensioning of the battery box 10 is realized based on the hanging structure 13, and the battery box 10 is directly transported to the mounting rack, so as to reduce the transportation difficulty of the battery box 10 and improve the transportation efficiency of the battery box 10.

[0038] The pair of outer side walls of the lower box body 1 are respectively arranged in planes parallel to the length direction Y of the battery box 10, so as to ensure that the length direction Y of the forklift cavities 14 on the pair of outer side walls of the lower box body 1 is parallel to the length direction Y of the battery box 10. Of course, the length direction Y of the forklift cavities 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 the length direction Y of the forklift cavities 14 on the pair of outer side walls is parallel, and the designated transport tool can be based on the forklift cavities 14 to fork and lift the battery box 10.

[0039] In some embodiments, as shown in FIG. 3, the lower box body 1 includes a bottom plate 16 (not shown in the figure) and a frame 17 surrounding the edge of the bottom plate 16, and the top cover 2 is fixedly connected with the frame 17.

[0040] As shown in FIG. 3, 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 arranged opposite and parallel in the length direction Y of the battery box 10, and the pair of side end plates 173 are arranged opposite and parallel in the width direction X of the battery box 10.

[0041] As shown in FIG. 4, the bottom of the lower box body 1 is provided with a first partition 164, and 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 realize the limiting of the battery module 20 in the battery compartment 3, so as to avoid the interference between the battery module 20 and the electrical components (such as battery management module, etc.) fixed on the front end plate 171.

[0042] Optionally, as shown in FIG. 4, the bottom of the lower box body 1 is further provided with a second partition 165 located in the battery compartment 3 and distributed side by side with the first partition 164, so as to separate 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 a plurality of rows of battery modules 20 in the plurality of sub-compartments, so as to realize the assembly of a plurality of rows and a plurality of columns of battery modules 20 in the battery compartment 3, thereby realizing the high-capacity effect of the energy storage device 100.

[0043] In combination with the specific structure of the lower box body 1, for the suspension structure 13 and the forklift cavity 14 arranged on the outer side wall of the lower box body 1, the suspension structure 13 and the forklift cavity 14 can be arranged on both edge portions of the bottom plate 16 close to the pair of side end plates 173; or the suspension structure 13 and the forklift cavity 14 can be arranged on the outer side surfaces 174 of the pair of side end plates 173; or one of the suspension structure 13 and the forklift cavity 14 can be arranged on both edge portions of the bottom plate 16 close to the pair of side end plates 173, and the other of the suspension structure 13 and the forklift cavity 14 can be arranged on the outer side surfaces 174 of the pair of side end plates 173.

[0044] When the suspension structure 13 and / or the forklift cavity 14 are arranged on 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, so as to ensure that the suspension structure 13 and / or the forklift cavity 14 on the bottom plate 16 protrude out of the side end plate 173, thereby facilitating the forklift lifting and suspension tensioning of the battery box 10. When the suspension structure 13 and the forklift cavity 14 are both arranged on the outer side surface 174 of the side end plate 173, the suspension structure 13 and the forklift cavity 14 can be arranged on the two side 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 on the same side edge portion of the side end plate 173 along the height direction of the battery box 10.

[0045] For example, as shown in FIG. 3, the suspension structure 13 and the forklift cavity 14 are arranged on the outer side 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 arranged on the side end plate 173, the collision between the designated transport tool and the electrical devices (battery management module, electrode connector) etc. on the battery box 10 can be avoided during the transfer of the battery box 10, thereby facilitating the guarantee of the structural integrity of the battery box 10 during the transfer process.

[0046] Next, the suspension structure 13 and the forklift cavity 14 are both located on the outer side surface 174 of the side end plate 173 as an example for detailed explanation.

[0047] In some embodiments, as shown in FIG. 3 or FIG. 5, the outer side surface 174 of the side end plate 173 is provided with a convex beam 175, the length direction of the convex beam 175 is parallel to the length direction Y of the battery box 10, and the convex beam 175 has at least one open forklift hole 1751, and the forklift hole 1751 surrounds the forklift cavity 14.

[0048] Thus, for the convex beam 175 provided on the outer side surface 174 of the side end plate 173, on the basis of the fork loading hole 1751, the structural strength of the side end plate 173 can be enhanced based on the convex beam 175 to ensure the structural stability of the lower box body 1 when the lower box body 1 is forked and lifted. In addition, since the fork loading cavity 14 is surrounded by the fork loading hole 1751, the stability of the fork lifting is ensured when the lower box body 1 is forked and lifted, and the risk of the lower box body 1 falling during transportation is avoided.

[0049] Among them, the convex beam 175 provided on the outer side surface 174 of the side end plate 173 can be fixed on the outer side surface 174 of the side end plate 173 by welding, or the side end plate 173 and the convex beam 175 can be an integral structure (such as an integral extruded aluminum profile). For the integral structure including the side end plate 173 and the convex beam 175, the connection strength between the convex beam 175 and the side end plate 173 can be ensured, so that when the lower box body 1 is forked and lifted by the fork loading cavity 14 on the convex beam 175, the risk of the convex beam 175 and the side end plate 173 breaking is avoided.

[0050] Optionally, as shown in FIG. 3 or FIG. 5, the convex beam 175 also has a hole wall penetrating the fork loading hole 1751, and a plurality of suspension holes 1752 spaced apart, and the plurality of suspension holes 1752 constitute the suspension structure 13. Thus, while the fork loading hole 1751 is provided on the convex beam 175, the plurality of suspension holes 1752 are provided based on the fork loading hole 1751 to simplify the structure of the lower box body 1.

[0051] It should be noted that in this application, in addition to setting the convex beam 175 on the outer side surface 174 of the side end plate 173 to form the fork loading cavity 14 on the convex beam 175, the fork loading cavity 14 can also be directly formed on the edge portion of the side end plate 173 close to the bottom plate 16. For example, the edge portion of the side end plate 173 close to the bottom plate 16 has a rectangular chamfer to surround the fork loading cavity 14 by the chamfer surface of the rectangular chamfer. In addition, in this application, in addition to setting the suspension hole 1752 on the convex beam 175 to form the suspension structure 13, a convex column can also be provided on the outer side surface 174 of the side end plate 173 to form the suspension structure 13, etc. The embodiments of the present application do not limit this.

[0052] In some embodiments, as shown in FIG. 5, the bottom of the lower box body 1 is provided with a plurality of rollers 15 spaced apart along the length direction Y of the battery box 10.

[0053] Therefore, by arranging the rollers 15 on the bottom of the lower box 1, the movement of the lower box 1 is facilitated when the lower box 1 is lifted by the designated transport tool, thereby improving the efficiency of the lifting. In addition, when the lower box 1 is transported to the position of the mounting rack and is pushed to be supported on the mounting rack, the friction between the bottom of the lower box 1 and the mounting rack can be reduced based on the contact between the rollers 15 and the mounting rack, thereby prolonging the service life of the lower box 1 and reducing the resistance when the lower box 1 is pushed in, thereby facilitating the assembly efficiency and convenience of the assembly of the lower box 1 on the mounting rack.

[0054] In combination with the specific structure of the lower box 1 described above, the bottom of the lower box 1 can be provided with at least two groups of rollers 15, so that when the battery box 10 is mounted on the mounting rack, the two groups of rollers 15 can be supported on the two guide rails of the mounting rack, respectively. In addition, the rollers 15 can be arranged on the lower surface of the bottom plate 16 or on the edge portion of the first opening end of the frame 17. For example, in the case where the edge portion of the side end plate 173 of the frame 17 is provided with the protruding beam 175 as described above, as shown in FIG. 5, a plurality of rollers are distributed on the bottom surface of the protruding beam 175, so that after the lower box 1 is transported to the mounting rack, the rollers 15 on the bottom of the lower box 1 can be supported on the mounting rack.

[0055] In some embodiments, as shown in FIGS. 3 and 6, the battery box 10 further includes a liquid cooling plate 4 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 1 included in the battery box 10 is provided with a liquid inlet connector 11 and a liquid outlet connector 12. The liquid inlet and the liquid outlet of the liquid cooling plate 4 are in communication with the liquid inlet connector 11 and the liquid outlet connector 12 on the bottom of the lower box 1, respectively.

[0056] Therefore, by arranging the rollers 15 on the bottom of the lower box 1, the movement of the lower box 1 is facilitated when the lower box 1 is lifted by the designated transport tool, thereby improving the efficiency of the lifting. In addition, when the lower box 1 is transported to the position of the mounting rack and is pushed to be supported on the mounting rack, the friction between the bottom of the lower box 1 and the mounting rack can be reduced based on the contact between the rollers 15 and the mounting rack, thereby prolonging the service life of the lower box 1 and reducing the resistance when the lower box 1 is pushed in, thereby facilitating the assembly efficiency and convenience of the assembly of the lower box 1 on the mounting rack.

[0057] 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 arranged 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 shown in FIG. 5, the bottom of the front end plate 171 is provided with the liquid inlet joint 11 and the liquid outlet joint 12.

[0058] In some embodiments, as shown in FIG. 6, the battery box 10 further comprises thermal insulation cotton 5, which is located between the bottom (i.e., the bottom plate 16) of the lower box body 1 and the liquid cooling plate 4.

[0059] In this way, by arranging the thermal insulation cotton 5, the direct contact between the bottom of the lower box body 1 and the liquid cooling plate 4 is isolated, the influence of the environment outside the lower box body 1 on the liquid cooling plate 4 is avoided, and 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 ensured. 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 generation of metal debris due to the relative friction between the liquid cooling plate 4 and the lower box body 1 when the liquid cooling plate 4 moves, thereby ensuring the safety of the energy storage device 100 during the charging and discharging process. Furthermore, based on the compressibility of the thermal insulation cotton 5, the expansion of the liquid cooling plate 4 can be buffered, and the conditions of the flow channel being extruded or even the flow channel collapsing or rupturing of the liquid cooling plate 4 can be avoided, thereby preventing the liquid cooling plate 4 from failing.

[0060] Optionally, as shown in FIG. 6, the surface of the bottom (i.e., the bottom plate 16) 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 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 has thermal insulation cotton 5 therein.

[0061] In this way, by arranging the limiting grooves 162, the thermal insulation cotton 5 can be limited to avoid movement in the lower box body 1. At the same time, due to the presence of the protrusions 161, there is a gap 31 between adjacent two thermal insulation cottons 5, thereby providing a space for movement under the extrusion of the liquid cooling plate 4.

[0062] Of course, in addition to arranging the protrusions 161 on the upper surface of the bottom plate 16 to form the limiting grooves 162 for limiting the thermal insulation cotton 5, the thermal insulation cotton 5 can also be directly adhered to the upper surface of the bottom plate 16 by an adhesive 32 or the like, as long as the thermal insulation cotton 5 can be positioned.

[0063] Optionally, as shown in FIGS. 7 and 8, the liquid cooling plate 4 and the inner side wall of the lower box body 1 have a gap 31 therebetween, and the gap 31 is filled with an adhesive 32.

[0064] Therefore, by arranging 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 generation of 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 the gap 31 between the liquid cooling plate 4 and the inner side wall of the lower box body 1 is filled with the adhesive 32, the liquid cooling plate 4 can be fixed and limited in the battery compartment 3, thereby ensuring the stability of the liquid cooling plate 4 and avoiding the movement of the liquid cooling plate 4 when the single battery included in the battery module 20 expands due to heat.

[0065] Optionally, as shown in FIGS. 7 and 9, the surface of each protrusion 161 has an insulating film layer 163, and the adhesive 32 is an insulating glue. In this way, by arranging the insulating film layer 163 on the protrusion 161 and arranging 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 electrification of the lower box body 1.

[0066] 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, the liquid cooling plate 4 and the bottom plate 16 can be insulated, and the liquid cooling plate 4 can be pre-fixed, thereby facilitating the communication of the inlet and outlet of the liquid cooling plate 4 with the inlet joint 11 and the outlet joint 12 at the bottom of the front end plate 171.

[0067] In some embodiments, as shown in FIGS. 7 and 9, the battery box 10 further includes a heat-conducting plate 6 located on the side of the liquid cooling plate 4 away from the bottom (the bottom plate 16) of the lower box body 1, and the heat-conducting plate 6 and the liquid cooling plate 4 accommodate heat-conducting glue 7 therebetween. In this way, by arranging 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.

[0068] Optionally, as shown in FIGS. 7 and 9, the surface of the liquid cooling plate 4 away from the bottom of the lower box body 1 has a plurality of limiting strips 33, 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 each of the plurality of glue grooves 34 has heat-conducting glue 7 therein. In this way, by arranging the limiting strips 33, the heat-conducting glue 7 can be easily applied on the liquid cooling plate 4, while avoiding overflow of the heat-conducting glue 7, thereby avoiding heat transfer between the liquid cooling plate 4 and the inner side wall of the lower box body 1.

[0069] In the embodiments of the present application, the terms "first", "second", "third" are only used for descriptive purpose and should not be understood as indicating or implying relative importance. The term "multiple" refers to two or more, unless otherwise explicitly limited. The terms "mount", "connect", "connection", "fix", and the like should be interpreted broadly, for example, "connection" can be fixed connection, or detachable connection, or integral connection; "connection" can be direct connection, or indirect connection through intermediate medium. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0070] In the description of the embodiments of the present application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the embodiments of the present application and simplify the description, and do not indicate or imply that the device or unit referred to must have a particular direction, be constructed and operated in a particular orientation, therefore, it should not be understood as a limitation on the embodiments of the present application.

[0071] In the description of the present application, the terms "one embodiment", "some embodiments", "a specific embodiment", and the like, mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0072] The above is only the preferred embodiment of the present application, and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A battery box, wherein, The utility model relates to a battery box, including: Lower box (1), the bottom edge of lower box (1) is provided with liquid inlet joint (11) and liquid outlet joint (12), and the opposite pair of outer side walls of lower box (1) all have suspension structure (13) and the fork loading cavity (14) extending along the length direction of battery box (10); Top cover (2) is fixedly connected with lower box (1), and encloses battery compartment (3); Liquid cooling plate (4) is fixed in battery compartment (3), and liquid cooling plate (4) has liquid inlet and liquid outlet, and liquid inlet and liquid outlet are communicated with liquid inlet joint (11) and liquid outlet joint (12) respectively.

2. The battery pack of claim 1, wherein, Lower box (1) includes bottom plate (16) and the frame (17) around the edge of bottom plate (16), and top cover (2) is fixedly connected with frame (17); Frame (17) includes front end plate (171), rear end plate (172) and a pair of side end plate (173), and front end plate (171) and rear end plate (172) are oppositely arranged along the length direction of battery box (10), and the bottom of front end plate (171) is provided with liquid inlet joint (11) and liquid outlet joint (12), and the outer side surface (174) of a pair of side end plate (173) is provided with suspension structure (13) and fork loading cavity (14).

3. The battery pack of claim 2, wherein, The outer side surface (174) of a pair of side end plate (173) has convex beam (175), and the length direction of convex beam (175) is parallel with the length direction of battery box (10), and convex beam (175) has at least one end opening fork loading hole (1751), and fork loading hole (1751) encloses fork loading cavity (14).

4. The battery pack of claim 3, wherein, Convex beam (175) also has the hole wall through fork loading hole (1751), and a plurality of suspension holes (1752) are spaced apart, and a plurality of suspension holes (1752) constitute suspension structure (13).

5. The battery pack of claim 3, wherein, Side end plate (173) and convex beam (175) are integrated extruded aluminum profile.

6. The battery pack of claim 1, wherein, The bottom of lower box (1) is provided with a plurality of rollers (15) spaced apart along the length direction of battery box (10).

7. The battery pack of claim 1, wherein, The surface of the bottom of the lower box (1) towards the liquid cooling plate (4) has a plurality of protrusions (161), a plurality of the protrusions (161) are spaced apart along the width direction of the battery box (10), and a plurality of the protrusions (161) and the inner side wall of the lower box (1) enclose a plurality of limiting grooves (162); The liquid cooling plate (4) is supported on a plurality of the protrusions (161), the battery box (10) further includes thermal insulation cotton (5), the thermal insulation cotton (5) is located between the bottom of the lower box (1) and the liquid cooling plate (4), and each of the limiting grooves (162) has the thermal insulation cotton (5).

8. The battery pack of claim 7, wherein, The edge of the liquid cooling plate (4) and the inner side wall of the lower box (1) have a gap (31), and the gap (31) is filled with an adhesive (32).

9. The battery pack of claim 8, wherein, The surface of each of the protrusions (161) is provided with an insulating film layer (163), and the adhesive (32) is an insulating adhesive.

10. The battery pack of claim 9, wherein, The insulating film layer (163) is an insulating adhesive layer.

11. The battery pack of any one of claims 1-10, wherein, The surface of the liquid cooling plate (4) away from the bottom of the lower box body (1) is provided with a plurality of limiting strips (33), and the plurality of limiting strips (33) and the inner side wall of the lower box body (1) form a plurality of adhesive grooves (34). The battery box (10) further comprises a heat-conducting plate (6) supported on the plurality of limiting strips (33), and the heat-conducting plate (6) and the liquid cooling plate (4) are provided with heat-conducting adhesive (7) located in the adhesive grooves (34).

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

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