Liquid-cooled battery energy storage system

Abstract

The utility model provides a liquid-cooled battery energy storage system, which belongs to the technical field of energy storage systems and comprises a liquid-cooled unit and a plurality of battery clusters. The liquid cooling unit is connected with a liquid supply header pipe and a liquid return header pipe; the plurality of battery clusters are arranged at intervals along a first direction; each battery cluster is connected with a liquid supply branch pipe group and a liquid return branch pipe group; the liquid supply header pipe and the liquid return header pipe are distributed below the plurality of battery clusters; the liquid inlet end of the liquid supply branch pipe group extends to the lower part of the corresponding battery cluster and is connected with the liquid supply main pipe; and the liquid outlet end of the liquid return branch pipe group extends to the lower part of the corresponding battery cluster and is connected with the liquid return header pipe. By optimizing the layout of the liquid supply header pipe and the liquid return header pipe, the battery cluster is prevented from being shielded, so that the maintenance operation efficiency of the battery cluster is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of energy storage systems, and more specifically, relates to a liquid-cooled battery energy storage system. Background Art

[0002] The liquid-cooled battery energy storage system is equipped with multiple battery clusters. Battery clusters are high-heat devices that need to be cooled and dissipated through a liquid cooling system. The liquid cooling system includes a liquid cooling unit, a liquid supply pipeline, and a liquid return pipeline. The liquid cooling unit supplies coolant to each battery cluster through the liquid supply pipeline. After passing through the battery cluster, the coolant returns to the liquid cooling unit through the liquid return pipeline.

[0003] If a battery cluster fails, the electrical modules of the battery cluster need to be removed from the battery cluster rack for maintenance. Since the liquid supply and return lines connect multiple battery clusters with the liquid cooling unit, the paths of the liquid supply and return lines are long, the pipe diameter is wide, the pipe body is strong, and deformation is not allowed. If the layout of the liquid supply and return lines is unreasonable and the electrical modules are blocked, the disassembly and assembly of the electrical modules will be time-consuming and the maintenance efficiency will be low. Utility Model Content

[0004] The utility model aims to provide a liquid-cooled battery energy storage system, aiming to solve the technical problem of low maintenance efficiency of battery clusters caused by unreasonable layout of liquid supply pipelines and liquid return pipelines in the prior art.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a liquid-cooled battery energy storage system, comprising:

[0006] Liquid cooling unit; the liquid cooling unit is connected to a liquid supply main pipe and a liquid return main pipe;

[0007] A plurality of battery clusters are arranged at intervals along a first direction; each of the battery clusters is connected to a liquid supply branch pipe group and a liquid return branch pipe group;

[0008] Wherein, the liquid supply main pipe and the liquid return main pipe are distributed under the plurality of battery clusters; the liquid inlet end of the liquid supply branch pipe group extends to the bottom of the corresponding battery cluster and is connected to the liquid supply main pipe; the liquid outlet end of the liquid return branch pipe group extends to the bottom of the corresponding battery cluster and is connected to the liquid return main pipe.

[0009] In a possible implementation, the battery cluster includes:

[0010] Support frame;

[0011] A plurality of battery packs are arranged on the support frame at intervals along the vertical direction; and

[0012] A main control box is arranged on the support frame and is located below the plurality of battery packs; the main control box is electrically connected to the plurality of battery packs;

[0013] Wherein, the liquid supply branch pipe group and the liquid return branch pipe group are located on the circumferential periphery of the main control box.

[0014] In some embodiments, the liquid supply branch pipe group includes a liquid supply branch pipe, and a plurality of liquid supply branch pipes respectively connected to the liquid supply branch pipes;

[0015] The liquid supply branch pipe includes a horizontal liquid supply pipe portion located below the main control box, and a vertical liquid supply pipe portion located on the front side of the battery cluster; one end of the horizontal liquid supply pipe portion is the liquid inlet end, and the other end is connected to the lower end of the vertical liquid supply pipe portion; the multiple liquid supply branch pipes are spaced apart in the up and down directions and are connected to the multiple battery packs one by one.

[0016] In some embodiments, the liquid return branch pipe group includes a liquid return branch pipe and a plurality of liquid return branch pipes respectively connected to the liquid return branch pipes;

[0017] The liquid return branch pipe includes a liquid return transverse pipe portion located below the main control box, and a liquid return vertical pipe portion located on the front side of the battery cluster; one end of the liquid return transverse pipe portion is the liquid outlet end, and the other end is connected to the lower end of the liquid return vertical pipe portion; the multiple liquid return branch pipes are spaced apart in the up and down directions and are connected to the multiple battery packs one by one.

[0018] In some embodiments, the liquid supply branch pipe and the liquid return branch pipe are both located directly in front of the corresponding battery pack.

[0019] In some embodiments, a fixing piece is connected between the liquid supply vertical pipe portion and the liquid return vertical pipe portion.

[0020] In a possible implementation, each of the liquid supply branch pipe groups is further provided with a first switch valve; each of the liquid return branch pipe groups is further provided with a second switch valve.

[0021] In some embodiments, the first switch valve is disposed at the liquid inlet end of the liquid supply branch pipe group; and the second switch valve is disposed at the liquid outlet end of the liquid return branch pipe group.

[0022] In some embodiments, an air inlet is provided on the liquid supply branch pipe group, and the air inlet is located behind the first switch valve.

[0023] In a possible implementation, the liquid-cooled battery energy storage system further includes:

[0024] The front side plate of the box body includes a door plate corresponding to the plurality of battery clusters; the rear side plate of the box body is closed.

[0025] The beneficial effects of the liquid-cooled battery energy storage system provided by the utility model are as follows: in the liquid-cooled battery energy storage system of the utility model, the liquid supply main pipe and the liquid return main pipe are located below the multiple battery clusters, and the liquid supply main pipe and the liquid return main pipe do not block the battery clusters in the front-to-back direction. When disassembling and assembling the electrical modules of the battery clusters, there is no need to avoid the liquid inlet main pipe and the liquid return main pipe, which facilitates disassembly and assembly; and the liquid inlet end of the liquid supply branch pipe group and the liquid outlet end of the liquid return branch pipe group are both located below the multiple battery clusters, and the liquid supply branch pipe group and the liquid return branch pipe group neither block the battery clusters nor are they easily switched on and off between the liquid supply branch pipe group and the liquid supply main pipe, and between the liquid return branch pipe group and the liquid return main pipe; compared with the prior art, the utility model optimizes the layout of the liquid supply main pipe and the liquid return main pipe to avoid blocking the battery clusters, thereby improving the maintenance operation efficiency of the battery clusters. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A schematic diagram of the structure of a liquid-cooled battery energy storage system provided by an embodiment of the utility model (the front side panel of the box is not shown in the figure);

[0028] Figure 2 A schematic diagram of the distribution structure of the overall pipeline in the liquid-cooled battery energy storage system provided by an embodiment of the utility model;

[0029] Figure 3 A schematic diagram of the distribution structure of the liquid supply branch pipe group and the liquid return branch pipe group in the liquid-cooled battery energy storage system provided in an embodiment of the utility model;

[0030] Figure 4 for Figure 2 A schematic diagram of the enlarged structure at the middle circle A;

[0031] Figure 5 A schematic diagram of the position structure of the liquid supply branch pipe and the liquid return branch pipe in the liquid-cooled battery energy storage system provided in an embodiment of the utility model;

[0032] Figure 6 A schematic diagram of the structure of a battery cluster of a liquid-cooled battery energy storage system provided by an embodiment of the utility model.

[0033] In the figure: 1. Liquid supply main pipe; 2. Liquid return main pipe; 3. Liquid supply branch pipe group; 31. Liquid supply branch pipe; 311. Liquid supply horizontal pipe; 312. Liquid supply vertical pipe; 32. Liquid supply branch pipe; 33. First switch valve; 34. Fixing piece; 35. Air inlet; 4. Liquid return branch pipe group; 41. Liquid return branch pipe; 411. Liquid return horizontal pipe; 412. Liquid return vertical pipe; 42. Liquid return branch pipe; 43. Second switch valve; 5. Battery cluster; 51. Support frame; 52. Battery pack; 53. Main control box; 6. Liquid cooling unit; 7. Box body. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] Please also read Figure 1 and Figure 2 , the liquid-cooled battery energy storage system provided by the utility model is now described. The liquid-cooled battery energy storage system includes a liquid cooling unit 6 and a plurality of battery clusters 5. The liquid cooling unit 6 is connected to a liquid supply main pipe 1 and a liquid return main pipe 2; a plurality of battery clusters 5 are arranged at intervals along the first direction; each battery cluster 5 is connected to a liquid supply branch pipe group 3 and a liquid return branch pipe group 4; wherein the liquid supply main pipe 1 and the liquid return main pipe 2 are distributed under the plurality of battery clusters 5; the liquid inlet end of the liquid supply branch pipe group 3 extends to the bottom of the corresponding battery cluster 5 and is connected to the liquid supply main pipe 1; the liquid outlet end of the liquid return branch pipe group 4 extends to the bottom of the corresponding battery cluster 5 and is connected to the liquid return main pipe 2.

[0036] The liquid cooling unit 6, the liquid supply main pipe 1, the liquid return main pipe 2, the plurality of liquid supply branch pipe groups 3 and the plurality of liquid return branch pipe groups 4 are combined to form the liquid cooling system of the liquid-cooled battery energy storage system. The liquid cooling unit 6 delivers cooling liquid to each battery cluster 5 through the liquid supply main pipe 1 and each liquid supply branch pipe group 3. After the cooling liquid passes through the battery cluster 5, it takes away the heat of the battery cluster 5, dissipates the heat of the battery cluster 5, and then flows back to the liquid cooling unit 6 through each liquid return branch pipe group 4 and the liquid return main pipe 2.

[0037] Multiple liquid supply branch pipe groups 3 and multiple liquid return branch pipe groups 4 correspond one-to-one to multiple battery clusters 5 respectively, and the structures of each liquid supply branch pipe group 3 and each liquid return branch pipe group 4 are the same. The pipeline is distributed in the same way, and the coolant flow rate supplied to each battery cluster 5 is the same, so that the difference in the heat dissipation effect of each battery cluster 5 is small.

[0038] The liquid supply main pipe 1 supplies cooling liquid to multiple battery clusters 5, and the liquid return main pipe 2 returns cooling liquid to the liquid cooling unit 6, so that the paths of the liquid supply main pipe 1 and the liquid return main pipe 2 are long, the pipe diameter is wide, the pipe body strength is high, and deformation is not allowed. The liquid supply branch pipe group 3 only connects the corresponding battery cluster 5 and the liquid supply main pipe 1, and the liquid return branch pipe group 4 only connects the corresponding battery cluster 5 and the liquid return main pipe 2. The liquid supply branch pipe group 3 and the liquid return branch pipe group 4 can reduce the path and pipe diameter accordingly. In addition, the liquid supply branch pipe group 3 and the liquid return branch pipe group 4 can also have the ability to deform and bend, that is, the liquid supply branch pipe group 3 and the liquid return branch pipe group 4 are flexible pipes.

[0039] In order to save the space occupied by the liquid-cooled battery energy storage system and optimize the layout of each pipeline in the liquid cooling system, the liquid cooling unit 6 is located on one side of the multiple battery clusters 5, that is, the liquid cooling unit 6 and the multiple battery clusters 5 are arranged along the first direction. The liquid supply main pipe 1 and the liquid return main pipe 2 are located below the multiple battery clusters 5, and the main bodies of the liquid supply main pipe 1 and the liquid return main pipe 2 are also distributed along the first direction.

[0040] Each battery cluster 5 has multiple battery modules. In the prior art, multiple electrical modules are spaced apart on the battery cluster rack in the vertical direction. If a battery cluster 5 fails, it is necessary to power off the battery cluster 5, disconnect the liquid cooling system, remove the electrical module from the battery cluster rack, and perform maintenance on the battery module. It should be noted that the disconnection method of the liquid cooling system can adopt the common methods in the prior art, such as closing the liquid outlet of the liquid cooling unit 6, no longer supplying coolant to the liquid supply main pipe 1, and the coolant in each battery cluster 5 (i.e., in the electrical module) flows back to the liquid return main pipe 2 through the corresponding liquid return branch pipe group 4, and finally gathers to the liquid cooling unit 6. After there is no coolant in the electrical module, the electrical module can be disassembled and assembled.

[0041] The liquid-cooled battery energy storage system can be used as a container-type battery energy storage system, that is, the liquid cooling unit 6 and the plurality of battery clusters 5 are arranged in a container. Figure 1 It should be noted that Figure 1 In order to avoid cluttering the drawings, only a group of battery clusters 5 located on the far left is shown, and other battery clusters 5 are not shown. The liquid cooling unit 6 is located on the far right.

[0042] In the liquid-cooled battery energy storage system provided by the utility model, the liquid supply main pipe 1 and the liquid return main pipe 2 are located below the multiple battery clusters 5, and the liquid supply main pipe 1 and the liquid return main pipe 2 do not block the battery clusters 5. When disassembling and assembling the electrical modules of the battery clusters 5, there is no need to avoid the liquid supply main pipe 1 and the liquid return main pipe 2, which is convenient for disassembly and assembly; and the liquid inlet end of the liquid supply branch pipe group 3 and the liquid outlet end of the liquid return branch pipe group 4 are both located below the multiple battery clusters 5, and the liquid supply branch pipe group 3 and the liquid return branch pipe group 4 do not block the battery clusters 5, and it is also convenient to implement the on-off operation of the liquid supply branch pipe group 3 and the liquid supply main pipe 1, and the liquid return branch pipe group 4 and the liquid return main pipe 2; compared with the prior art, the utility model optimizes the layout of the liquid supply main pipe 1 and the liquid return main pipe 2 to avoid blocking the battery clusters 5, so as to improve the maintenance operation efficiency of the battery clusters 5;

[0043] In addition, due to the serious heat accumulation from the top solar radiation and the container body 7, the liquid supply main pipe 1 and the liquid return main pipe 2 are arranged below the multiple battery clusters 5, so that the liquid temperature inside the pipeline is basically not affected by the solar radiation and the heat accumulation in the box 7, the refrigeration energy efficiency is high, and the risk of leakage when the pipeline is set on the top is effectively avoided, making the electrical module of the battery cluster 5 operate more safely.

[0044] In some embodiments, the battery cluster 5 may be configured as follows: Figure 6 The structure shown, see Figure 6 The battery cluster 5 includes a support frame 51, a plurality of battery packs 52 and a main control box 53. The support frame 51 is used to support the plurality of battery packs 52 and the main control box 53. Specifically, the plurality of battery packs 52 are arranged on the support frame 51 at intervals along the up-down direction; the main control box 53 is also arranged on the support frame 51 and is located below the plurality of battery packs 52; the main control box 53 is electrically connected to the plurality of battery packs 52, and the main control box 53 is used to control the series and parallel connection and power on and off of the plurality of battery packs 52. The plurality of battery packs 52 and the main control box 53 can be considered as the above-mentioned electrical module.

[0045] In a battery energy storage system, the smallest unit is a battery cell. Multiple battery cells are connected in series and parallel to form a battery module. Multiple battery modules can be connected in series and parallel to form a battery pack 52. Then, multiple battery packs 52 are connected in series and parallel to form a battery cluster 5. Finally, multiple battery clusters 5 are electrically connected to form a battery energy storage system.

[0046] A liquid cooling plate is provided inside the battery pack 52, and the liquid cooling plate is attached to each battery module. A flow channel is provided on the liquid cooling plate, and the coolant passes through the flow channel to take away the heat of each battery module, thereby cooling and dissipating the battery module. The liquid cooling and heat dissipation technology of the above-mentioned battery pack 52 is an existing technology and will not be described in detail here.

[0047] Preferably, each battery pack 52 and the main control box 53 can slide relative to the support frame 51. That is, when the battery cluster 5 fails and needs maintenance, the battery pack 52 and the main control box 53 can be removed from the support frame 51 after the liquid cooling system is disconnected and the battery pack 52 and the main control box 53 are powered off. Specifically, the sliding direction of the battery pack 52 and the main control box 53 can be understood as the front-rear direction of the battery pack 52.

[0048] Specifically, the main control box 53 has the highest maintenance frequency. The liquid supply branch pipe group 3 and the liquid return branch pipe group 4 are located on the circumferential periphery of the main control box 53, and the liquid supply main pipe 1 and the liquid return main pipe 2 are located below the main control box 53. The liquid supply branch pipe group 3, the liquid return branch pipe group 4, the liquid supply main pipe 1, and the liquid return main pipe 2 do not block the main control box 53 in the sliding direction of the main control box 53 (i.e., the front and rear direction), thereby facilitating the disassembly and assembly of the main control box 53.

[0049] In some embodiments, the liquid supply branch pipe group 3 can be used as follows: Figure 2 and Figure 3 The structure shown, see Figure 2 and Figure 3 The liquid supply branch pipe group 3 includes a liquid supply branch pipe 31, and a plurality of liquid supply branch pipes 32 respectively connected to the liquid supply branch pipe 31; the liquid supply branch pipe 31 includes a liquid supply transverse pipe portion 311 located below the main control box 53, and a liquid supply vertical pipe portion 312 located on the front side of the battery cluster 5; one end of the liquid supply transverse pipe portion 311 is a liquid inlet end, and the other end is connected to the lower end of the liquid supply vertical pipe portion 312; the plurality of liquid supply branch pipes 32 are spaced apart in the up and down directions and are connected to the plurality of battery packs 52 one by one.

[0050] The liquid supply branch pipe 31 is used to connect the liquid supply main pipe 1 with multiple liquid supply branch pipes 32. The liquid supply branch pipe 31 includes a liquid supply transverse pipe portion 311 and a liquid supply vertical pipe portion 312, that is, the liquid supply branch pipe 31 is an L-shaped tubular structure, the liquid supply transverse pipe portion 311 is located below the main control box 53, and the liquid supply vertical pipe portion 312 is located on the front side of the multiple battery packs 52 and the main control box 53, so that the liquid supply branch pipe 31 can completely avoid the main control box 53 and the multiple battery packs 52 in the sliding direction (i.e., the front and rear direction), and does not affect the sliding and disassembly operation of the main control box 53 and each battery pack 52.

[0051] A male plug is provided on the front face of the battery pack 52, and a female plug is provided at one end of the liquid supply branch pipe 32, and the female plug and the male plug can be quickly plugged and assembled. The liquid supply branch pipe 32 is used to connect the corresponding battery pack 52. The liquid supply branch pipe 32 can be a flexible tube, so that the liquid supply branch pipe 32 can be deformed to the periphery of the battery pack 52 after being separated from the battery pack 52, and does not block the battery pack 52. The liquid supply branch pipe 32 can also be connected to the liquid supply branch pipe 31 through a rotating joint. After the liquid supply branch pipe 32 and the battery pack 52 are disconnected, the liquid supply branch pipe 32 can be moved to the periphery of the battery pack 52 by rotating the liquid supply branch pipe 32, and does not block the battery pack 52.

[0052] In some embodiments, the liquid return branch pipe group 4 can adopt the same structure as the liquid supply branch pipe group 3. Figure 2 and Figure 3 The liquid return branch pipe group 4 includes a liquid return branch pipe 41, and a plurality of liquid return branch pipes 42 respectively connected to the liquid return branch pipe 41; the liquid return branch pipe 41 includes a liquid return transverse pipe portion 411 located below the main control box 53, and a liquid return vertical pipe portion 412 located on the front side of the battery cluster 5; one end of the liquid return transverse pipe portion 411 is a liquid outlet end, and the other end is connected to the lower end of the liquid return vertical pipe portion 412; the plurality of liquid return branch pipes 42 are spaced apart in the up and down direction and are connected to the plurality of battery packs 52 one by one.

[0053] The liquid return branch pipe group 4 has the same structure as the liquid supply branch pipe group 3 and thus has the same effect as the liquid supply branch pipe group 3 , which will not be described in detail herein.

[0054] Preferably, the liquid supply branch pipe 32 and the liquid return branch pipe 42 are both extended and distributed in the left-right direction, and the liquid supply branch pipe 32 and the liquid return branch pipe 42 are both located in front of the corresponding battery pack 52. The above arrangement can reduce the length of the liquid supply branch pipe 32 and the liquid return branch pipe 42 accordingly, avoid the liquid supply branch pipe 32 and the liquid return branch pipe 42 from blocking other battery packs 52, especially avoid the liquid supply branch pipe 32 and the liquid return branch pipe 42 at the bottom from blocking the main control box 53, so as to facilitate the disassembly and assembly of the main control box 53.

[0055] See also Figure 5 In some embodiments, a fixing member 34 is connected between the liquid supply vertical pipe portion 312 and the liquid return vertical pipe portion 412. The fixing member 34 can connect the liquid supply vertical pipe portion 312 and the liquid return vertical pipe portion 412 at the same time, and the fixing member 34 can also be fixed on the support frame 51 or the side wall of the container body 7, thereby improving the stability of the liquid supply branch pipe 31 and the liquid return branch pipe 41.

[0056] Preferably, the fixing member 34 includes two groups of clamping rings and fixing plates, wherein one group of clamping rings is fastened on the liquid supply vertical pipe portion 312, and the other group of clamping rings is fastened on the liquid return vertical pipe portion 412, and the two groups of clamping rings are respectively connected to the fixing plates; the fixing plate can be connected to the support frame 51 or the side wall of the box body 7 of the container, and screws can also be connected to the clamping rings so that the screws pass through the fixing plate and are threadedly connected to the support frame 51 or the side wall of the box body 7 of the container.

[0057] Before performing maintenance on the battery pack 52 and the main control box 53, it is necessary to disconnect the liquid cooling system to drain the coolant in the battery pack 52; after the maintenance is completed, it is necessary to re-inject coolant into the battery pack 52. In the prior art, since the liquid-cooled battery energy storage system has multiple battery clusters 5, if a battery pack 52 in one of the battery clusters 5 fails, it is necessary to drain all the coolant in the liquid cooling system and then inject new coolant. This not only wastes coolant, but also takes a long time, resulting in low maintenance efficiency. In order to avoid the above problems, in some embodiments, the above-mentioned liquid supply branch pipe group 3 and liquid return branch pipe group 4 can be used as follows Figure 4 The structure shown, see Figure 4 Each liquid supply branch pipe group 3 is also provided with a first switch valve 33, and the first switch valve 33 is used to control the on-off of the liquid supply branch pipe group 3; each liquid return branch pipe group 4 is also provided with a second switch valve 43, and the second switch valve 43 is used to control the on-off of the liquid return branch pipe group 4.

[0058] In this embodiment, a first switch valve 33 is provided on each liquid supply branch pipe group 3, and a second switch valve 43 is provided on each liquid return branch pipe group 4. When a battery pack 52 of a battery cluster 5 needs maintenance, it is only necessary to close the corresponding liquid supply branch pipe group 3 through the first switch valve 33 and the corresponding liquid return branch pipe group 4 through the second switch valve 43, and then discharge the coolant in the battery cluster 5. After maintenance, new coolant can be injected. Therefore, the coolant consumed by replacing a battery pack 52 is only the coolant corresponding to a battery cluster 5, which is more cost-effective and avoids affecting other battery clusters 5.

[0059] In addition, the liquid supply branch pipe group 3 is provided with an air inlet 35, which is located behind the first switch valve 33. Figure 4 After the first switch valve 33 closes the corresponding liquid supply branch pipe group 3, air is introduced into the liquid supply branch pipe group 3 through the air inlet 35. Under the action of pressure, the coolant is pushed back to the liquid return branch pipe group 4. When the coolant in the liquid return branch pipe group 4 is completely discharged, the second switch valve 43 closes the liquid return branch pipe group 4.

[0060] See also Figure 4 On the basis of the above embodiment, the first switch valve 33 is arranged at the liquid inlet end of the liquid supply branch pipe group 3; the second switch valve 43 is arranged at the liquid outlet end of the liquid return branch pipe group 4.

[0061] Since the liquid inlet end of the liquid supply branch pipe group 3 and the liquid outlet end of the liquid return branch pipe group 4 are both located below the battery cluster 5, the first switch valve 33 and the second switch valve 43 are also located below the battery cluster 5. The temperature below the battery cluster 5 is low, making the operation of the first switch valve 33 and the second switch valve 43 more convenient.

[0062] In some embodiments, the liquid-cooled battery energy storage device can also be used as follows Figure 1 The structure shown, see Figure 1 The liquid-cooled battery energy storage system further includes a box body 7; the front side plate of the box body 7 includes door plates corresponding to the multiple battery clusters 5 one by one; and the rear side plate of the box body 7 is closed.

[0063] The box 7 is used to enclose multiple battery clusters 5 and the liquid cooling system. The front side panel of the box 7 includes multiple door panels, each door panel corresponds to a battery cluster 5. When a battery cluster 5 needs to be maintained, only the corresponding door panel needs to be opened without opening the entire front side panel.

[0064] In addition, the rear side panels of the box body 7 are closed, that is, the rear side panels cannot be opened manually, so that other electrical equipment can be arranged behind the box body 7, or another group of the above-mentioned liquid-cooled battery energy storage systems can be arranged (the rear side panels of the two groups of liquid-cooled battery energy storage systems are arranged face to face) to improve the space utilization of the workplace of the liquid-cooled battery energy storage system and increase the power density.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A liquid-cooled battery energy storage system, characterized in that: include: A liquid cooling unit (6); the liquid cooling unit (6) is connected to a liquid supply main pipe (1) and a liquid return main pipe (2); A plurality of battery clusters (5) are arranged at intervals along a first direction; each of the battery clusters (5) is connected to a liquid supply branch pipe group (3) and a liquid return branch pipe group (4); The liquid supply main pipe (1) and the liquid return main pipe (2) are distributed below the plurality of battery clusters (5); the liquid inlet end of the liquid supply branch pipe group (3) extends below the corresponding battery cluster (5) and is connected to the liquid supply main pipe (1); the liquid outlet end of the liquid return branch pipe group (4) extends below the corresponding battery cluster (5) and is connected to the liquid return main pipe (2).

2. The liquid-cooled battery energy storage system according to claim 1, characterized in that: The battery cluster (5) comprises: Support frame (51); A plurality of battery packs (52) are arranged on the support frame (51) at intervals in the up-down direction; and A main control box (53) is arranged on the support frame (51) and is located below the plurality of battery packs (52); the main control box (53) is electrically connected to the plurality of battery packs (52); Wherein, the liquid supply branch pipe group (3) and the liquid return branch pipe group (4) are located on the circumferential periphery of the main control box (53).

3. The liquid-cooled battery energy storage system according to claim 2, characterized in that: The liquid supply branch pipe group (3) comprises a liquid supply branch pipe (31) and a plurality of liquid supply branch pipes (32) respectively connected to the liquid supply branch pipes (31); The liquid supply branch pipe (31) comprises a liquid supply transverse pipe portion (311) located below the main control box (53), and a liquid supply vertical pipe portion (312) located on the front side of the battery cluster (5); one end of the liquid supply transverse pipe portion (311) is the liquid inlet end, and the other end is connected to the lower end of the liquid supply vertical pipe portion (312); a plurality of the liquid supply branch pipes (32) are spaced apart in the up-down direction and are connected to a plurality of the battery packs (52) in a one-to-one correspondence.

4. The liquid-cooled battery energy storage system according to claim 3, characterized in that: The liquid return branch pipe group (4) comprises a liquid return branch pipe (41) and a plurality of liquid return branch pipes (42) respectively connected to the liquid return branch pipes (41); The liquid return branch pipe (41) comprises a liquid return transverse pipe portion (411) located below the main control box (53), and a liquid return vertical pipe portion (412) located on the front side of the battery cluster (5); one end of the liquid return transverse pipe portion (411) is the liquid outlet end, and the other end is connected to the lower end of the liquid return vertical pipe portion (412); a plurality of the liquid return branch pipes (42) are spaced apart in the up-down direction and are connected to a plurality of the battery packs (52) in a one-to-one correspondence.

5. The liquid-cooled battery energy storage system according to claim 4, characterized in that: The liquid supply branch pipe (32) and the liquid return branch pipe (42) are both located directly in front of the corresponding battery pack (52).

6. The liquid-cooled battery energy storage system according to claim 4, characterized in that: A fixing member (34) is connected between the liquid supply vertical pipe portion (312) and the liquid return vertical pipe portion (412).

7. The liquid-cooled battery energy storage system according to claim 1, characterized in that: Each of the liquid supply branch pipe groups (3) is also provided with a first switch valve (33); and each of the liquid return branch pipe groups (4) is also provided with a second switch valve (43).

8. The liquid-cooled battery energy storage system according to claim 7, characterized in that: The first switch valve (33) is arranged at the liquid inlet end of the liquid supply branch pipe group (3); and the second switch valve (43) is arranged at the liquid outlet end of the liquid return branch pipe group (4).

9. The liquid-cooled battery energy storage system according to claim 7, characterized in that: The liquid supply branch pipe group (3) is provided with an air inlet (35), and the air inlet (35) is located behind the first switch valve (33).

10. The liquid-cooled battery energy storage system according to claim 1, characterized in that: The liquid-cooled battery energy storage system also includes: A box body (7); a front side plate of the box body (7) includes door plates corresponding one to one to the plurality of battery clusters (5); and a rear side plate of the box body (7) is closed.

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