CN219123323U - Liquid cooling battery box for energy storage system - Google Patents

Abstract

The utility model provides a liquid cooling battery box for an energy storage system, which comprises a box body and a box cover arranged on the box body; the box body comprises a bottom plate, a left side plate, a right side plate, a front panel and a rear panel, wherein the left side plate and the right side plate are arranged corresponding to the left side and the right side of the bottom plate, the front panel and the rear panel are arranged corresponding to the front end and the rear end of the bottom plate, and the left side plate, the right side plate, the front panel and the rear panel are all connected with the bottom plate to form the box body; the left side and the right side of the front panel are respectively connected with the left side plate and the right side plate. The liquid cooling battery box for the energy storage system has the advantages of light weight, high strength, good heat exchange effect and low cost. The box is formed by splicing the bottom plate, the left side plate, the right side plate, the front panel and the rear panel, the box is formed by splicing a plurality of plates, each plate is easy to produce and process, and the overall production and processing difficulty of the box is reduced.

Description

Liquid cooling battery box for energy storage system

Technical Field

The utility model belongs to the field of energy storage battery boxes, and particularly relates to a liquid cooling battery box for an energy storage system.

Background

Because the energy required by people has strong timeliness and space property, in order to reasonably utilize the energy and improve the utilization rate of the energy, a device is needed to collect and store the excessive energy temporarily unused in a period of time in a certain way, and the energy is extracted and used when the energy is used in a peak or is transported to a place where the energy is short of for use, and the system is an energy storage system. The energy storage system has multiple expression forms when being applied to different fields, wherein an energy storage power station, an electric automobile, a high-power emergency power supply and the like all use a lithium ion battery pack as a carrier of the energy storage system, the lithium ion battery pack is used as a core part of the whole battery system, the production cost, the running performance and the safety performance of the whole battery system are greatly influenced, and a battery box body is used as a carrier of an energy storage battery, so that the energy storage system plays a key role in use, safety and protection of the battery pack.

At present, main stream liquid cooling boxes in the market mainly comprise two types: firstly, a sheet metal box body is matched with a split type liquid cooling plate, the defect is that the liquid cooling plate cannot bear load, elastic support is needed between the liquid cooling plate and the box body, the assembly difficulty is high, and the liquid cooling plate is placed in the box body, so that a certain potential safety hazard of liquid leakage is provided; the other is an integral liquid cooling plate for die casting, which has the defects of high die cost, low heat exchange capability, easy air hole, sand hole and the like in the aluminum casting process, high rejection rate, certain potential safety hazard of liquid leakage and high post-remediation processing cost. Therefore, there is a need for a liquid-cooled battery box that is cost-effective, easy to produce and assemble, and less prone to leakage.

Disclosure of Invention

In view of the above, the utility model aims to provide a liquid cooling battery box for an energy storage system, so as to solve the problem that the existing liquid cooling box body is not easy to produce and assemble.

In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:

a liquid cooling battery box for an energy storage system comprises a box body and a box cover arranged on the box body; the box body comprises a bottom plate, a left side plate, a right side plate, a front panel and a rear panel, wherein the left side plate and the right side plate are arranged corresponding to the left side and the right side of the bottom plate, the front panel and the rear panel are arranged corresponding to the front end and the rear end of the bottom plate, and the left side plate, the right side plate, the front panel and the rear panel are all connected with the bottom plate to form the box body; the left side and the right side of the front panel are respectively connected with the left side plate and the right side plate, a front bottom beam is arranged on one side, facing the middle part of the bottom plate, of the front panel, the left side of the front bottom beam is respectively connected with the left side plate and the right side plate, and the middle part of the front bottom beam is connected with the bottom plate; the left side and the right side of the rear panel are respectively connected with the left side plate and the right side plate, one side, facing the middle part of the bottom plate, of the rear panel is provided with a rear bottom beam, the left side and the right side of the rear bottom beam are respectively connected with the left side plate and the right side plate, and the middle part of the rear bottom beam is connected with the bottom plate; the bottom plate is internally provided with a liquid cooling runner, the left side plate and the right side plate are L-shaped structural members, and the horizontal ends of the left side plate and the right side plate are respectively provided with a side runner communicated with the liquid cooling runner.

Further, the horizontal ends of the left side plate and the right side plate are respectively provided with a liquid supply pipe communicated with the side flow.

Further, the liquid supply pipes at the horizontal ends of the left side plate and the right side plate are arranged corresponding to the front panel, the liquid cooling flow channel is communicated with the two side flow channels to form an M-shaped liquid passage, and two ends of the liquid passage are respectively communicated with the liquid supply pipes on the left side plate and the right side plate.

Further, a plurality of partition plates are arranged in the side flow channel at intervals, and a water passing gap communicated with the liquid supply pipe is formed between two adjacent partition plates; a plurality of flow dividing plates are arranged in the liquid cooling flow passage at intervals, and a liquid passing gap communicated with the water passing gap exists between two adjacent flow dividing plates.

Further, one side of the vertical ends of the left side plate and the right side plate, which are different from the horizontal ends, is provided with longitudinal reinforcing ribs, and the longitudinal reinforcing ribs are correspondingly arranged with the horizontal ends of the left side plate or the right side plate.

Further, the vertical end of left side board and right side board is different from the one side of horizontal end all is equipped with the bellying, the bellying corresponds the middle part setting of the vertical end of left side board or right side board, be equipped with the lifting hole on the bellying.

Further, the vertical ends of the left side plate and the right side plate are respectively provided with an upper cavity above the corresponding bulge, and the positions below the corresponding bulge are respectively provided with a lower cavity; the protruding portion is of a trapezoid structure, and a penetrating cavity communicated with the lifting hole is formed in the protruding portion.

Further, one end of the front bottom beam, which faces the middle part of the bottom plate, is provided with a protruding part, the other end of the front bottom beam is arranged on the front panel, and one side of the protruding part, which faces the front panel, is provided with a transverse reinforcing rib.

Further, the protruding portion is of a hollow structure, a mounting hole for mounting the battery module is formed in the protruding portion, and the mounting hole is communicated with the inner cavity of the protruding portion.

Further, the back bottom beam is of a hollow structure, the position of the back bottom beam corresponding to the mounting hole is provided with a mounting hole for mounting the battery module, and the mounting hole is communicated with the inner cavity of the back bottom beam.

Compared with the prior art, the liquid cooling battery box for the energy storage system has the following advantages:

(1) The liquid cooling battery box for the energy storage system has the advantages of light weight, high strength, good heat exchange effect and low cost. The box is formed by splicing the bottom plate, the left side plate, the right side plate, the front panel and the rear panel, the box is formed by splicing a plurality of plates, each plate is easy to produce and process, and the overall production and processing difficulty of the box is reduced. In addition, through setting up the side runner at left side board and right side board horizontal end to set up the liquid cooling runner on the bottom plate, through concatenation left side board, right side board and bottom plate, can directly form the liquid passageway of M type in the bottom half, utilize liquid supply pipe and liquid passageway intercommunication can realize the high-efficient heat dissipation of box, need not to install other cooling device again, further reduced the production and processing degree of difficulty of box. Meanwhile, the side plates and the bottom plate can be welded directly by adopting a friction stir welding process, so that the welding effect is good, the structural strength is high, and leakage of cooling liquid can be effectively avoided.

(2) According to the liquid cooling battery box for the energy storage system, the front bottom beam is arranged on the front panel, the rear bottom beam is arranged on the rear panel, and the longitudinal reinforcing ribs arranged on the left side plate and the right side plate are matched, so that the box body has higher structural strength and stability, is not easy to deform in the use process, and can ensure that a liquid passage in the box body is not easy to be damaged, thereby reducing the possibility of leakage of cooling liquid. In addition, through set up the mounting hole on preceding floorbar to set up the pilot hole on the back floorbar, the subsequent assembly of battery module in the box of being convenient for ensures the holistic leakproofness of box, is favorable to improving the security of this kind of battery box in the use.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

fig. 1 is a schematic structural diagram of a liquid-cooled battery box for an energy storage system according to an embodiment of the present utility model;

fig. 2 is a schematic structural diagram of a tank body in a liquid-cooled battery tank for an energy storage system according to an embodiment of the present utility model;

fig. 3 is a schematic structural diagram of a right side plate in a liquid-cooled battery box for an energy storage system according to an embodiment of the present utility model;

fig. 4 is a schematic structural diagram of a rear panel in a liquid-cooled battery box for an energy storage system according to an embodiment of the present utility model;

fig. 5 is a schematic structural diagram of a front panel in a liquid-cooled battery box for an energy storage system according to an embodiment of the present utility model;

FIG. 6 is a front view of a liquid-cooled battery box for an energy storage system according to an embodiment of the present utility model;

FIG. 7 is a schematic view of the structure in the direction A-A in FIG. 6.

Reference numerals illustrate:

1. a case cover; 2. a case; 3. a maintenance window; 4. a plug connector base; 5. a bottom plate; 6. a left side plate; 7. a right side plate; 8. a liquid supply pipe; 9. a rear panel; 10. a front panel; 11. a front bottom beam; 12. a rear bottom beam; 13. longitudinal reinforcing ribs; 14. a hoisting hole; 15. a boss; 16. a lower cavity; 17. penetrating the cavity; 18. an upper cavity; 19. a fitting hole; 20. a protruding portion; 21. transverse reinforcing ribs; 22. a mounting hole; 23. a side flow channel; 24. a liquid cooling runner; 25. a partition plate; 26. a diverter plate; 27. a water passing gap; 28. and a liquid passing gap.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art in a specific case.

The utility model will be described in detail below with reference to the drawings in connection with embodiments.

As shown in fig. 1 to 7, the liquid-cooled battery box for the energy storage system comprises a box body 2 and a box cover 1 arranged on the box body 2; the box body 2 comprises a bottom plate 5, a left side plate 6, a right side plate 7, a front panel 10 and a rear panel 9, wherein the left side plate 6 and the right side plate 7 are arranged corresponding to the left side and the right side of the bottom plate 5, the front panel 10 and the rear panel 9 are arranged corresponding to the front end and the rear end of the bottom plate 5, and the left side plate 6, the right side plate 7, the front panel 10 and the rear panel 9 are all connected with the bottom plate 5 to form the box body 2; the left side and the right side of the front panel 10 are respectively connected with the left side plate 6 and the right side plate 7, one side of the front panel 10 facing the middle part of the bottom plate 5 is provided with a front bottom beam 11, the left side and the right side of the front bottom beam 11 are respectively connected with the left side plate 6 and the right side plate 7, and the middle part of the front bottom beam 11 is connected with the bottom plate 5; the left side and the right side of the rear panel 9 are respectively connected with the left side plate 6 and the right side plate 7, one side, facing the middle part of the bottom plate 5, of the rear panel 9 is provided with a rear bottom beam 12, the left side and the right side of the rear bottom beam 12 are respectively connected with the left side plate 6 and the right side plate 7, and the middle part of the rear bottom beam 12 is connected with the bottom plate 5; the bottom plate 5 is internally provided with a liquid cooling flow channel 24, the left side plate 6 and the right side plate 7 are L-shaped structural members, and the horizontal ends of the left side plate 6 and the right side plate 7 are respectively provided with a side flow channel 23 communicated with the liquid cooling flow channel 24.

Optionally, the bottom plate 5, the left side plate 6, the right side plate 7, the front panel 10 and the rear panel 9 are all integrated structural members, wherein the side flow channel 23 on the left side plate 6, the side flow channel 23 on the right side plate 7 and the liquid cooling flow channel 24 on the bottom plate 5 can be integrally formed by adopting a profile extrusion process, and the components can have corresponding use functions and safety characteristics only by simple machining treatment in the later stage, are easy to produce and process and have high processing yield. The front panel 10 may further be provided with a positive electrode plug connector base 4 and a negative electrode plug connector base 4, the plug connector base 4 may be designed as a boss, so that power lines in the battery cluster are convenient to connect, and the power line routing mode is shortest, so that the cost is low.

Compared with other processing modes, the novel plastic runner is directly extruded and molded through a set of profile die, secondary welding is not needed between the plate and the runner, time and labor are saved, and good tightness of the runner is ensured. And carrying out secondary machining on the extruded plate to obtain the structures of lifting hole positions of the box body 2, drawing hole positions of the box body 2, liquid cooling flow channels 24 with different lengths and the like. In addition, the depth of the box body 2 can be adjusted at will, and the lower box body 2 with any depth can be obtained only by changing the cutting position of the extruded section bar, so that the battery module with different length and size is matched, the expansibility is strong, and a person skilled in the art can select and adjust the battery module according to the needs, and the details are not repeated here. In addition, in actual use, box 2 of this kind of battery box accessible bolted connection case lid 1 and box 2, and can set up sealed pad between case lid 1, the box 2, play sealed effect, and the person skilled in the art also can select other modes to connect box 2 and case lid 1 according to actual need.

In the practical application process, the case cover 1 can be formed by adopting a sheet metal bending process and is matched with a stamping die to form an upper cover reinforced convex hull structure. Wherein, case lid 1 can also set up detachable maintenance window 3 towards one side of front panel 10, and maintenance window 3 can use the bolt to add sealed pad and fix, and later stage accessible maintenance window 3 is maintained the inside BMU of box 2, and swiftly convenient, the maintenance window 3 also can be installed to other modes to the skilled person to make maintenance window 3 guarantee case lid 1 leakproofness in, can realize convenient dismantlement can.

In addition, the main body of the box body 2 is formed by splicing and welding a bottom plate 5, a left side plate 6, a right side plate 7, a front panel 10 and a rear panel 9, friction stir welding and laser welding are used among the plates, the welding process is simple, the strength is high, the weight of a module can be directly borne, and other bearing structures are not required to be added.

Optionally, the horizontal ends of the left side plate 6 and the right side plate 7 are respectively provided with a liquid supply pipe 8 communicated with the side flow 23. Illustratively, the liquid supply pipe 8 may be welded and fixed to the horizontal end of the left side plate 6 or the right side plate 7, and the horizontal ends of the left side plate 6 and the right side plate 7 are provided with through holes for installing the liquid supply pipe 8.

In the practical application process, the liquid supply pipes 8 at the horizontal ends of the left side plate 6 and the right side plate 7 are arranged in front of the front panel 10, the liquid cooling flow channels 24 are communicated with the two side flow channels 23 to form M-shaped liquid passages, and two ends of each liquid passage are respectively communicated with the liquid supply pipes 8 on the left side plate 6 and the right side plate 7. Illustratively, the liquid supply pipe 8 is disposed at a position outside the tank 2, and by disposing the liquid supply pipe 8 at the horizontal ends of the left side plate 6 and the right side plate 7 and connecting the two ends of the M-shaped liquid passage with the liquid supply pipes 8 at the horizontal ends of the left side plate 6 and the right side plate 7, respectively, the cooling liquid can enter the liquid passage through the liquid supply pipe 8 on one side plate and flow out of the liquid passage from the liquid supply pipe 8 on the other side plate, so that the cooling liquid can continuously flow through the liquid passage, thereby realizing efficient cooling of the tank 2.

Compared with the existing liquid cooling passages with other shapes, the M-shaped liquid passage has larger covered area, can slow down the passing speed of cooling liquid, is favorable for the cooling liquid to fully absorb heat in the box body 2, and therefore achieves efficient cooling and heat dissipation of the box body 2.

Optionally, in order to further cool and dissipate heat of the box body 2, a plurality of partition plates 25 are arranged in the side flow path 23 at intervals, and a water passing gap 27 communicated with the liquid supply pipe 8 exists between two adjacent partition plates 25; a plurality of flow dividing plates 26 are arranged in the liquid cooling flow channel 24 at intervals, and a liquid passing gap 28 communicated with a water passing gap 27 exists between two adjacent flow dividing plates 26.

Illustratively, at least two partition plates 25 are provided at intervals, and the partition plates 25 are integrally formed with the horizontal ends of the left side plate 6 or the right side plate 7. The splitter plates 26 are also arranged at least two at intervals, and the splitter plates 26 and the bottom plate 5 are integrally formed. Through being equipped with a plurality of division boards 25 at the interval in side channel 23 to set up a plurality of flow distribution plates 26 at the interval in liquid cooling runner 24, division board 25 and flow distribution plate 26 not only can further increase the area of contact of box 2 and cooling liquid, thereby improve the conduction efficiency of box 2 heat to cooling liquid, make cooling liquid realize the high-efficient heat dissipation to box 2. And division plate 25 and flow dividing plate 26 can also split the liquid passageway into a plurality of small-size M type passageways, are favorable to further slowing down the flow rate of cooling liquid, improve the cooling effect of cooling liquid to box 2.

In addition, division board 25 and flow distribution plate 26 that the interval set up still is favorable to improving the structural strength of box 2 bottom curb plate and bottom plate 5, and division board 25 and flow distribution plate 26 can form the structure of similar strengthening rib, forms the additional strengthening of an M type in box 2 bottom, are favorable to further improving box 2 holistic structural strength, ensure that box 2 can be stable bear the weight of the battery module all the time.

Furthermore, alternatively, the vertical ends of the left side plate 6 and the right side plate 7 are respectively provided with a longitudinal reinforcing rib 13 at a side different from the horizontal end, and the longitudinal reinforcing ribs 13 are correspondingly arranged with the horizontal ends of the left side plate 6 or the right side plate 7. The longitudinal direction of the longitudinal reinforcing ribs 13 is the same as the longitudinal direction of the left side plate 6 or the right side plate 7, so as to improve the longitudinal structural strength of the left side plate 6 and the right side plate 7.

Illustratively, the longitudinal reinforcing ribs 13 are integrally formed with the vertical ends of the left side plate 6 or the right side plate 7, and the longitudinal reinforcing ribs 13 are beneficial to improving the structural strength of the box body 2 and avoiding deformation of the box body 2. In addition, the left side plate 6 and the right side plate 7 of the L-shaped structure have good structural strength, and the longitudinal reinforcing ribs 13 are arranged corresponding to the horizontal ends of the left side plate 6 or the right side plate 7, so that the left side plate 6 and the right side plate 7 can form an inverted T-shaped structure with better structural strength, and the longitudinal structural strength of the inverted T-shaped structure is higher than that of other structures.

In the practical application process, the horizontal ends of the left side plate 6 and the right side plate 7 can be provided with grooves towards one side of the bottom plate 5, the length direction of the grooves is the same as the length direction of the side plates, the left side and the right side of the bottom plate 5 can be provided with protrusions matched with the grooves, the welding of the side plates and the bottom plate 5 is facilitated by utilizing the protrusions and the grooves to be matched, the structural strength of the joint of the bottom plate 5 and the side plate is improved, the front panel 10 and the rear panel 9 are combined to be connected with the bottom plate 5, the box body 2 can have good longitudinal and transverse structural strength, and the box body 2 is ensured to be difficult to deform in the use process.

Optionally, the vertical end of left side board 6 and right side board 7 is different from the one side of horizontal end all is equipped with bellying 15, bellying 15 corresponds the middle part setting of the vertical end of left side board 6 or right side board 7, be equipped with lifting hole 14 on the bellying 15. By providing the lifting hole 14, subsequent assembly and installation of such a battery box is facilitated.

Illustratively, the length direction of the protruding portion 15 is the same as the length direction of the side plates, wherein the vertical ends of the left side plate 6 and the right side plate 7 are respectively provided with an upper cavity 18 at a position above the protruding portion 15, and a lower cavity 16 at a position below the protruding portion 15; the cross section of the protruding portion 15 is of a trapezoid structure, and a penetrating cavity 17 communicated with the hoisting hole 14 is formed in the protruding portion 15. The upper cavity 18, the lower cavity 16 and the penetrating cavity 17 are not communicated with each other, and the length directions of the three are the same as the length direction of the side plate. By arranging the upper cavity 18 and the lower cavity 16 on the side plates, the weight of the side plates is reduced on the premise that the structural strength of the side plates is not reduced, so that the weight of the box body 2 is reduced, and the subsequent assembly and use inconvenience caused by the overweight of the box body 2 are avoided.

In addition, through set up bellying 15 at the vertical end middle part of curb plate, bellying 15 is favorable to further improving the structural strength of curb plate, through set up the cavity 17 that runs through on bellying 15, is favorable to reducing the weight of bellying 15 and curb plate. And through the communication of the through cavity 17 and the lifting hole 14, the lifting hook on the lifting equipment is convenient to hook the protruding part 15, so that the lifting difficulty of the box body 2 is reduced. In order to improve stability in the lifting process of the box body 2, a plurality of lifting holes 14 can be formed in the protruding portion 15 at intervals, each lifting hole 14 is communicated with the through cavity 17, and a person skilled in the art can select a proper position to set up the plurality of lifting holes 14 according to actual needs, so that the description is omitted here.

Optionally, one end of the front bottom beam 11 facing the middle of the bottom plate 5 is provided with a protruding part 20, the other end is arranged on the front panel 10, and one side of the protruding part 20 facing the front panel 10 is provided with a transverse reinforcing rib 21. The length direction of the transverse reinforcing ribs 21 is the same as the length direction of the front bottom beam 11, so as to improve the transverse structural strength of the front bottom beam 11.

Illustratively, the front sill 11 is integrally formed with the front panel 10, the protruding part 20 has a hollow structure, the protruding part 20 is provided with a mounting hole 22 for mounting the battery module, and the mounting hole 22 communicates with the inner cavity of the protruding part 20. By adopting the hollow-structured protruding portion 20, the weight of the front sill 11 is reduced while the structural strength of the front sill 11 is improved. In addition, the contact area of the front bottom beam 11 with the bottom plate 5 and the side plates can be improved by the protruding part 20, so that the structural strength of the front bottom beam 11 can be better enhanced, and the transverse reinforcing rib 21 arranged on the protruding part 20 towards the front panel 10 side can also enhance the transverse structural strength of the front bottom beam 11.

Optionally, the rear bottom beam 12 is of a hollow structure, and an assembly hole 19 for installing the battery module is arranged on the rear bottom beam 12 corresponding to the installation hole 22, and the assembly hole 19 is communicated with the internal cavity of the rear bottom beam 12. Through set up mounting hole 22 on preceding floorbar 11 to set up mounting hole 19 on back floorbar 12, the assembly of follow-up battery module in box 2 of being convenient for ensures the holistic leakproofness of box 2, is favorable to improving the security of this kind of battery case in the use.

The liquid cooling battery box provided by the embodiment is easy to produce and assemble by adopting a combined structure, each plate can be integrally formed by adopting an aluminum profile extrusion process, the expandability is strong, the die cost is low, the strength of the bottom plate 5 is high, and the direct bearing can be realized. Wherein, curb plate and bottom plate 5 can be respectively extrusion back, through friction stir welding welded fastening, front panel 10 and rear panel 9 then accessible laser welding fixes on bottom plate 5 and curb plate, and whole box 2 is formed by five panel concatenation welding alone, has not only reduced the production processing degree of difficulty of each panel, and welding process is simple and intensity is higher between each panel moreover, can directly bear battery module weight, need not to increase other bearing structures, has reduced the production and the assembly degree of difficulty of box 2.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims (10)

1. The utility model provides a liquid cooling battery box for energy storage system which characterized in that: comprises a box body (2) and a box cover (1) arranged on the box body (2); the box body (2) comprises a bottom plate (5), a left side plate (6), a right side plate (7), a front panel (10) and a rear panel (9), wherein the left side plate (6) and the right side plate (7) are arranged corresponding to the left side and the right side of the bottom plate (5), the front panel (10) and the rear panel (9) are arranged corresponding to the front end and the rear end of the bottom plate (5), and the left side plate (6), the right side plate (7), the front panel (10) and the rear panel (9) are all connected with the bottom plate (5) to form the box body (2); the left side and the right side of the front panel (10) are respectively connected with the left side plate (6) and the right side plate (7), one side, facing the middle part of the bottom plate (5), of the front panel (10) is provided with a front bottom beam (11), the left side and the right side of the front bottom beam (11) are respectively connected with the left side plate (6) and the right side plate (7), and the middle part of the front bottom beam (11) is connected with the bottom plate (5); the left side and the right side of the rear panel (9) are respectively connected with the left side plate (6) and the right side plate (7), one side, facing the middle part of the bottom plate (5), of the rear panel (9) is provided with a rear bottom beam (12), the left side and the right side of the rear bottom beam (12) are respectively connected with the left side plate (6) and the right side plate (7), and the middle part of the rear bottom beam (12) is connected with the bottom plate (5); the novel liquid cooling device is characterized in that a liquid cooling flow channel (24) is arranged in the bottom plate (5), the left side plate (6) and the right side plate (7) are L-shaped structural members, and the horizontal ends of the left side plate (6) and the right side plate (7) are provided with side flow channels (23) communicated with the liquid cooling flow channel (24).

2. The liquid-cooled battery box for an energy storage system according to claim 1, wherein: the horizontal ends of the left side plate (6) and the right side plate (7) are respectively provided with a liquid supply pipe (8) communicated with the side flow (23).

3. The liquid-cooled battery box for an energy storage system according to claim 2, wherein: the liquid supply pipes (8) at the horizontal ends of the left side plate (6) and the right side plate (7) are arranged corresponding to the front panel (10), the liquid cooling flow channels (24) are communicated with the two side flow channels (23) to form an M-shaped liquid passage, and two ends of the liquid passage are respectively communicated with the liquid supply pipes (8) on the left side plate (6) and the right side plate (7).

4. A liquid-cooled battery box for an energy storage system according to claim 2 or 3, wherein: a plurality of partition plates (25) are arranged in the side flow pipe (23) at intervals, and a water passing gap (27) communicated with the liquid supply pipe (8) is formed between two adjacent partition plates (25); a plurality of flow dividing plates (26) are arranged in the liquid cooling flow channel (24) at intervals, and a liquid passing gap (28) communicated with the water passing gap (27) exists between two adjacent flow dividing plates (26).

5. The liquid-cooled battery box for an energy storage system according to claim 1, wherein: the vertical end of left side board (6) and right side board (7) all are equipped with vertical strengthening rib (13) in the one side of horizontal end that is different from, vertical strengthening rib (13) correspond the setting with the horizontal end of left side board (6) or right side board (7).

6. The liquid-cooled battery box for an energy storage system according to claim 1, wherein: the vertical end of left side board (6) and right side board (7) all are equipped with bellying (15) in the one side that is different from the horizontal end, bellying (15) correspond the middle part setting of the vertical end of left side board (6) or right side board (7), be equipped with lifting hole (14) on bellying (15).

7. The liquid-cooled battery box for an energy storage system according to claim 6, wherein: the vertical ends of the left side plate (6) and the right side plate (7) are respectively provided with an upper cavity (18) corresponding to the position above the bulge (15), and the positions corresponding to the position below the bulge (15) are respectively provided with a lower cavity (16); the protruding portion (15) is of a trapezoid structure, and a penetrating cavity (17) communicated with the hoisting hole (14) is formed in the protruding portion (15).

8. The liquid-cooled battery box for an energy storage system according to claim 1, wherein: one end of the front bottom beam (11) facing the middle part of the bottom plate (5) is provided with a protruding part (20), the other end of the front bottom beam is arranged on the front panel (10), and one side of the protruding part (20) facing the front panel (10) is provided with a transverse reinforcing rib (21).

9. The liquid-cooled battery box for an energy storage system according to claim 8, wherein: the protruding portion (20) is of a hollow structure, a mounting hole (22) for mounting the battery module is formed in the protruding portion (20), and the mounting hole (22) is communicated with the inner cavity of the protruding portion (20).

10. The liquid-cooled battery box for an energy storage system according to claim 9, wherein: the rear bottom beam (12) is of a hollow structure, an assembly hole (19) for installing the battery module is formed in the position, corresponding to the installation hole (22), of the rear bottom beam (12), and the assembly hole (19) is communicated with the inner cavity of the rear bottom beam (12).

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