High-power-density battery energy storage system and energy storage container

Abstract

The utility model provides a high-power-density battery energy storage system and an energy storage container, which belong to the technical field of energy storage containers and comprise a plurality of groups of battery clusters and a main control box, the multiple groups of battery clusters are arranged in the vertical direction; each group of battery clusters comprises a plurality of battery packs connected in series, and the plurality of battery packs are arranged in the vertical direction; the main control box is positioned below the plurality of groups of battery clusters; and a plurality of groups of electric control elements are arranged in the main control box, correspond to the battery clusters one by one and are electrically connected with the battery clusters. A plurality of groups of electric control elements are arranged in the main control box, so that the main control box can simultaneously control a plurality of groups of battery clusters to discharge; a plurality of battery clusters correspond to one main control box, so that the occupied space of the main control box is saved, and the power density of the battery energy storage system is correspondingly improved; in addition, the multiple battery clusters are arranged in the vertical direction, the main control box is located below the multiple battery clusters, most lines are distributed below the multiple battery clusters, the line layout is optimized, and the main control box is easy to maintain and operate.

Description

Technical Field

[0001] The utility model belongs to the technical field of containers, and more specifically, relates to a high power density battery energy storage system and an energy storage container. Background Art

[0002] Lithium-ion battery energy storage systems are mostly designed in a modular manner. In lithium-ion battery energy storage systems, the smallest unit is the battery cell. Multiple battery cells are connected in series and parallel to form a battery module. Multiple battery modules can be installed in a shell after being connected in series and parallel to form a battery pack. Then, multiple battery packs are connected in series to form a battery cluster. Finally, multiple battery clusters are electrically connected to form a battery energy storage system.

[0003] In the prior art, each battery cluster must be connected to a main control box, which controls the discharge of the corresponding battery cluster. Since the main control box takes up space and is electrically connected to the corresponding battery cluster, each battery cluster of the battery energy storage system is connected to a main control box. Setting up multiple main control boxes will reduce the power density of the battery energy storage system and make the line distribution complicated. Utility Model Content

[0004] The purpose of the utility model is to provide a high power density battery energy storage system and an energy storage container, aiming to solve the technical problems of low power density and complex line distribution of battery energy storage systems existing in the prior art.

[0005] To achieve the above objectives, in a first aspect, an embodiment of the utility model provides a high power density battery energy storage system, comprising:

[0006] A plurality of battery clusters are arranged in an up-down direction; each of the battery clusters comprises a plurality of battery packs connected in series, and the plurality of battery packs are arranged in an up-down direction; and

[0007] The main control box is located below the multiple battery clusters; the main control box has multiple electric control components, which correspond to and are electrically connected to the multiple battery clusters one by one.

[0008] In combination with the first aspect, in a possible implementation manner, the high power density battery energy storage system further includes:

[0009] A battery cluster rack; a plurality of groups of the battery clusters and the main control box are arranged on the battery cluster rack, and each group of the battery clusters and the main control box can slide on the battery cluster rack in the front-rear direction.

[0010] In some embodiments, the battery cluster rack comprises:

[0011] Two groups of support beams are symmetrically distributed along the left-right direction; each group of the support beams includes a plurality of support beams arranged in the up-down direction, each of the support beams extends in the front-back direction, and the support beams are correspondingly supported on the bottom side edge of one of the battery packs / the main control box; and

[0012] The two groups of column groups correspond one to one with the two groups of support beam groups; each group of the column groups includes a plurality of columns, the columns extend in the up-down direction, and the columns connect the plurality of support beams of the corresponding support beam group.

[0013] In combination with the first aspect, in a possible implementation manner, front end surfaces of the plurality of battery packs are flush with a front end surface of the main control box, and a length of the main control box is smaller than a length of the battery packs.

[0014] The high-power density battery energy storage system provided by the utility model has the following beneficial effects: compared with the prior art, the high-power density battery energy storage system of the utility model has a plurality of groups of electric control elements in the main control box, and the plurality of groups of electric control elements correspond to the plurality of battery clusters one by one and are electrically connected, so that the main control box can control the discharge of the plurality of battery clusters at the same time; the plurality of battery clusters correspond to one main control box, which saves the space occupied by the main control box and correspondingly improves the power density of the high-power density battery energy storage system; in addition, the plurality of battery clusters are arranged in the up-down direction, the main control box is located below the plurality of battery clusters, and most of the lines are distributed below the plurality of battery clusters, which optimizes the line layout and facilitates maintenance operations on the main control box.

[0015] In a second aspect, the embodiment of the utility model further provides an energy storage container, comprising:

[0016] The front side plate of the box is a door plate, and the rear side plate of the box is closed; and

[0017] The above-mentioned high power density battery energy storage system is arranged in the box.

[0018] In combination with the second aspect, in a possible implementation, the high power density battery energy storage system is provided with a plurality of groups, and arranged in the box body along the left-right direction;

[0019] The door panel includes sub-door panels corresponding one by one to multiple groups of the high-power density battery energy storage systems; the sub-door panels are located directly in front of the corresponding high-power density battery energy storage systems when in a closed state.

[0020] In combination with the first aspect, in a possible implementation, the high power density battery energy storage system further includes a battery cluster rack, and multiple groups of the battery clusters and the main control box are arranged on the battery cluster rack; the multiple groups of the battery cluster racks divide the inner cavity of the box into multiple sub-compartments;

[0021] The battery cluster frame includes two groups of support beams and two groups of columns symmetrically distributed along the left and right directions; each group of the support beams includes a plurality of support beams arranged in the up-down direction, each of the support beams extends in the front-back direction, and the support beams are correspondingly supported on the bottom side edge of one of the battery packs / the main control box;

[0022] Each group of the column groups includes a plurality of columns, the columns extend in the up-down direction, and the columns are connected to the plurality of support beams of the corresponding support beam group;

[0023] Among them, the two adjacent groups of support beam groups of each two adjacent sub-bin bodies share one group of column groups.

[0024] In combination with the first aspect, in a possible implementation manner, the energy storage container further includes:

[0025] The liquid cooling unit is arranged in the box and is located on one side of the multiple groups of high power density battery energy storage systems; the liquid cooling unit is connected to a liquid supply main pipe and a liquid return main pipe, and the liquid supply main pipe and the liquid return main pipe are distributed below the multiple groups of high power density battery energy storage systems.

[0026] In some embodiments, each of the high-power density battery energy storage systems is connected to a liquid supply branch pipe group and a liquid return branch pipe group, the liquid inlet end of the liquid supply branch pipe group extends to the bottom of the corresponding high-power density battery energy storage system 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 high-power density battery energy storage system and is connected to the liquid return main pipe.

[0027] In some embodiments, each of the liquid supply branch pipe groups is provided with a first switch valve; each of the liquid return branch pipe groups is provided with a second switch valve.

[0028] The beneficial effect of the energy storage container provided by the utility model is that compared with the prior art, the energy storage container of the utility model, due to the adoption of the above-mentioned high power density battery energy storage system, can improve the power density of the energy storage container, optimize the line layout, and facilitate maintenance operations on the high power density battery energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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.

[0030] Figure 1A schematic diagram of the structure of a high power density battery energy storage system provided by an embodiment of the utility model;

[0031] Figure 2 A schematic diagram of the structure of the energy storage container provided in the embodiment of the utility model Figure 1 (The door panel of the box is not shown in the figure);

[0032] Figure 3 A schematic diagram of the structure of the energy storage container provided in the embodiment of the utility model Figure 2 ;

[0033] Figure 4 A schematic diagram of the distribution structure of the overall pipeline of the energy storage container provided in the embodiment of the utility model;

[0034] Figure 5 for Figure 4 Schematic diagram of the enlarged structure at the center circle A.

[0035] In the figure: 1. battery cluster; 11. battery pack; 2. main control box; 3. battery cluster frame; 31. support beam; 32. column; 4. box body; 41. sub-door panel; 5. liquid cooling unit; 61. liquid supply main pipe; 62. liquid return main pipe; 63. liquid supply branch pipe group; 64. liquid return branch pipe group; 65. first switch valve; 66. second switch valve; 67. air inlet. DETAILED DESCRIPTION

[0036] 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.

[0037] It should be noted that the directions or positional relationships indicated by “front”, “rear”, “inside”, “outside”, “upper”, and “lower” in this embodiment are based on the direction of the high power density battery energy storage system after application, wherein the front of the high power density battery energy storage system represents the “front”, the back represents the “rear”, the top represents the “upper”, and the bottom represents the “lower”, “inside” refers to the side facing the inside of the high power density battery energy storage system in the left-right direction, and “outside” refers to the side facing the outside of the high power density battery energy storage system in the left-right direction.

[0038] In addition, the front-to-back direction defined in the embodiments of the present invention refers to the spacing direction between the front and back sides of the high-power density battery energy storage system, the left-right direction defined refers to the spacing direction between the two side surfaces of the high-power density battery energy storage system, and the up-down direction defined refers to the spacing direction between the top and bottom surfaces of the high-power density battery energy storage system.

[0039] See also Figure 1The high power density battery energy storage system provided by the utility model is now described. The high power density battery energy storage system comprises a plurality of battery clusters 1 and a main control box 2. The plurality of battery clusters 1 are arranged in an up-down direction; each battery cluster 1 comprises a plurality of battery packs 11 connected in series, and the plurality of battery packs 11 are arranged in an up-down direction; the main control box 2 is located below the plurality of battery clusters 1; the main control box 2 has a plurality of electronic control elements, and the plurality of electronic control elements correspond to the plurality of battery clusters 1 one by one and are electrically connected.

[0040] In the high power density 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 installed in a housing to form a battery pack 11 after being connected in series and parallel. Then, multiple battery packs 11 are connected in series to form a battery cluster 1. Multiple battery packs 11 are arranged in parallel in the up and down directions to form a group of battery clusters 1, which are then arranged in parallel with other battery clusters 1 up and down. The number of the above-mentioned battery clusters 1 and the number of battery packs 11 in each group of battery clusters 1 can be determined according to the installation location, installation space and discharge capacity requirements of the high power density battery energy storage system.

[0041] by Figure 1 As shown in the example, Figure 1 There are two battery clusters 1 arranged in parallel, and each battery cluster 1 has four battery packs 11, so Figure 1 There are eight battery packs 11 in the main control box 2. Correspondingly, there are two groups of electronic control components in the main control box 2. The upper four battery packs 11 from top to bottom are connected in series and then connected to one group of electronic control components in the main control box 2, and the lower four battery packs 11 are connected in series and then connected to another group of electronic control components in the main control box 2. Multiple battery packs 11 are arranged in the up and down direction, which can make full use of the height space and improve the power density of the high power density battery energy storage system.

[0042] If the battery cluster 1 fails, the battery cluster 1 needs to be powered off and the battery pack 11 and the main control box 2 need to be maintained. The main control box 2 has the highest maintenance frequency, so the main control box 2 is placed at the bottom.

[0043] It should be noted that the technical solution that the battery cluster 1 is electrically connected to the main control box 2 and the discharge is controlled by the main control box 2 belongs to the prior art and will not be described in detail here.

[0044] Compared with the prior art, the high-power density battery energy storage system provided by the utility model has multiple groups of electronic control elements in the main control box 2, and the multiple groups of electronic control elements correspond to the multiple groups of battery clusters 1 one by one and are electrically connected, so that the main control box 2 can control the discharge of the multiple groups of battery clusters 1 at the same time; multiple battery clusters 1 correspond to one main control box 2, which saves the space occupied by the main control box 2 and correspondingly improves the power density of the high-power density battery energy storage system; in addition, the multiple groups of battery clusters 1 are arranged in the up and down direction, the main control box 2 is located below the multiple groups of battery clusters 1, and most of the lines are distributed below the multiple battery clusters 1, which optimizes the line layout and facilitates maintenance operations on the main control box 2.

[0045] In some embodiments, the high power density battery energy storage system can also be used as follows Figure 1 The structure shown, see Figure 1 The high power density battery energy storage system further comprises a battery cluster frame 3. Among them, multiple battery clusters 1 and main control boxes 2 are arranged on the battery cluster frame 3, and each battery cluster 1 and main control box 2 can slide on the battery cluster frame 3 in the front-rear direction.

[0046] The battery cluster frame 3 is used to support multiple battery clusters 1 and the main control box 2. Compared with the existing traditional cabinet structure supporting the battery cluster 1, the battery cluster frame 3 is a frame structure, which is light in weight and occupies a small space, and can correspondingly improve the power density of the high-power density battery energy storage system; and the battery cluster frame 3 is not closed, which improves the air cooling efficiency of the battery cluster 1.

[0047] In addition, each battery cluster 1 and main control box 2 can slide on the battery cluster frame 3 in the front-rear direction, so that the battery pack 11 and main control box 2 can be easily removed from and loaded into the battery cluster frame 3.

[0048] See also Figure 1 On the basis of the above implementation mode, the battery cluster frame 3 includes two groups of support beam groups and two groups of column groups; the two groups of support beam groups are symmetrically distributed along the left-right direction; each group of support beam groups includes a plurality of support beams 31 arranged along the up-down direction, each support beam 31 extends along the front-back direction, and the support beam 31 is correspondingly supported on the bottom side edge of one of the battery packs 11 / main control box 2; the two groups of column groups correspond one-to-one to the two groups of support beam groups; each group of column groups includes a plurality of columns 32, the columns 32 extend along the up-down direction, and the columns 32 connect the plurality of support beams 31 of the corresponding support beam group.

[0049] The support beam 31 has a support surface, and the support surface is used to support the battery pack 11. In order to save the installation space of the battery pack 11 and facilitate heat dissipation, the side edges of the bottom surface of the battery pack 11 are generally slid on the support surface. Specifically, the left and right side edges of the bottom surface of the battery pack 11 are each supported on a support beam 31, that is, one battery pack 11 requires two support beams 31 for support. Therefore, this embodiment limits the two groups of support beams to be symmetrically distributed along the left and right directions, that is, each support beam 31 has another support beam 31 symmetrical to it, and the two support beams 31 jointly support one battery pack 11.

[0050] The columns 32 are used to connect the multiple support beams 31 into one body to form a frame structure; each column 32 extends and is distributed in the up-down direction to connect the multiple support beams 31 distributed at intervals in the up-down direction.

[0051] In some embodiments, the battery pack 11 and the main control box 2 can be used as follows: Figure 1 The structure shown, see Figure 1 The front end surfaces of the multiple battery packs 11 are flush with the front end surface of the main control box 2; the rear end surfaces of the multiple battery packs 11 are flush; the length of the main control box 2 is smaller than the length of the battery packs 11.

[0052] The length of the battery pack 11 is determined by the number of battery modules inside it. A longer battery pack 11 means more battery modules are distributed inside it, so its discharge capacity is large. The main control box 2 is mainly used to place electronic components, which are small in size. Therefore, as long as the main control box 2 can completely accommodate the electronic components, it is not necessary to design the main control box 2 to be the same length as the battery pack 11.

[0053] If the length of the main control box 2 is smaller than the length of the battery pack 11, there will be an empty space behind the main control box 2, in which lines can be laid to optimize the line layout, and the space can also form air cooling and heat dissipation.

[0054] It should be noted that, for the support beam group, the support beam 31 located at the bottom (i.e., the support beam 31 supporting the main control box 2) can be designed to be the same length as the main control box 2, and the remaining support beams 31 can be designed to be the same length as the battery pack 11.

[0055] See also Figure 2 and Figure 3 Based on the same inventive concept, the embodiment of the present application also provides an energy storage container, including a box body 4 and the above-mentioned energy storage battery system. The front side plate of the box body 4 is a door plate, and the rear side plate of the box body 4 is closed; the high power density battery energy storage system is arranged in the box body 4.

[0056] The box 4 is used to enclose multiple battery clusters 1 and the main control box 2. The front side panel of the box 4 is a door panel, and the rear side panel of the box 4 is closed, that is, the rear side panel cannot be opened manually, so that other electrical equipment can be arranged behind the box 4, or another set of the above-mentioned high-power density battery energy storage system can be arranged (the rear side panels of the two sets of high-power density battery energy storage systems are arranged face to face) to improve the space utilization rate of the workplace of the high-power density battery energy storage system and increase the power density.

[0057] In some embodiments, the energy storage container can also be used as follows Figure 2 and Figure 3 The structure shown, see Figure 2 and Figure 3 There are multiple groups of high-power density battery energy storage systems, which are arranged in the box 4 along the left-right direction; the door panel includes sub-door panels 41 corresponding to the multiple groups of high-power density battery energy storage systems; the sub-door panels 41 are located directly in front of the corresponding high-power density battery energy storage system when closed.

[0058] It should be understood that the box body 4 of the embodiment of the present application may be a hollow structure, preferably a rectangular parallelepiped structure. In addition, in order to facilitate transportation and reduce transportation costs, the energy storage container of the embodiment of the present application may be a container of standard size, for example, a 20-foot or 40-foot container may be used. The number of high-power density battery energy storage systems is determined according to the length of the box body 4 in the left-right direction and the width of the high-power density battery energy storage system itself.

[0059] The door panel of the cabinet includes multiple sub-door panels 41, each sub-door panel 41 corresponds to a group of high-power density battery energy storage systems. When a group of high-power density battery energy storage systems needs to be maintained, it is only necessary to open the corresponding sub-door panel 41 without opening the entire front side panel.

[0060] It should be noted that in Figure 2 In order to avoid cluttering the drawings, only a group of high power density battery energy storage systems located on the far left is shown, and other high power density battery energy storage systems are not shown.

[0061] In some embodiments, the high power density battery energy storage system further includes a battery cluster rack 3, on which multiple battery clusters 1 and a main control box 2 are arranged; the multiple battery cluster racks 3 divide the inner cavity of the box body 4 into multiple sub-compartments.

[0062] Specifically, the battery cluster frame 3 includes two groups of support beam groups and two groups of column groups that are symmetrically distributed along the left-right direction; each group of support beam groups includes a plurality of support beams 31 arranged along the up-down direction, each support beam 31 extends along the front-to-back direction, and the support beam 31 is correspondingly supported on the bottom side edge of one of the battery packs 11 / main control box 2; each group of column groups includes a plurality of columns 32, the columns 32 extend along the up-down direction, and the columns 32 connect the plurality of support beams 31 of the corresponding support beam group.

[0063] The two adjacent groups of support beams of each two adjacent sub-bin bodies share a group of columns.

[0064] The box body 4 is a hollow structure, which can be understood as multiple battery cluster frames 3 dividing the box body 4 to form multiple sub-box bodies. Moreover, among the multiple sub-box bodies, each two adjacent sub-box bodies share a set of columns, so that the battery cluster 1 and the main control box 2 can be directly set in the box body 4, abandoning the setting of the traditional battery cabinet. In addition to the box body 4, there is no need to set up multiple cabinets, which reduces the space originally occupied by the battery cabinet, thereby improving the power density of the energy storage container; and the multiple sub-box bodies are still relatively independent, which can limit the risks such as thermal runaway to a smaller space, ensuring the safety performance of the energy storage container.

[0065] In some embodiments, the energy storage container can also be used as follows Figure 2 and Figure 4 The structure shown, see Figure 2 and Figure 4 The energy storage container also includes a liquid cooling unit 5, which is arranged in the box body 4 and is located on one side of the multiple groups of high power density battery energy storage systems; the liquid cooling unit 5 is connected to a liquid supply main pipe 61 and a liquid return main pipe 62, and the liquid supply main pipe 61 and the liquid return main pipe 62 are distributed below the multiple groups of high power density battery energy storage systems.

[0066] Each high power density battery energy storage system is connected to a liquid supply branch pipe group 63 and a liquid return branch pipe group 64. The liquid inlet end of the liquid supply branch pipe group 63 extends to the bottom of the corresponding high power density battery energy storage system and is connected to the liquid supply main pipe 61; the liquid outlet end of the liquid return branch pipe group 64 extends to the bottom of the corresponding high power density battery energy storage system and is connected to the liquid return main pipe 62.

[0067] The liquid cooling unit 5, the liquid supply main pipe 61, the liquid return main pipe 62, a plurality of liquid supply branch pipe groups 63 and a plurality of liquid return branch pipe groups 64 are combined to form the liquid cooling system of the energy storage container. The liquid cooling unit 5 delivers cooling liquid to each high-power density battery energy storage system through the liquid supply main pipe 61 and each liquid supply branch pipe group 63. After the cooling liquid passes through each battery pack 11 of the battery cluster 1, it takes away the heat of the battery pack 11, dissipates the heat of the battery pack 11, and then flows back to the liquid cooling unit 5 through each liquid return branch pipe group 64 and the liquid return main pipe 62.

[0068] The plurality of liquid supply branch pipe groups 63 and the plurality of liquid return branch pipe groups 64 correspond one to one with the plurality of high power density battery energy storage systems respectively, and the structures of the liquid supply branch pipe groups 63 and the structures of the liquid return branch pipe groups 64 are the same. The same pipeline distribution method is adopted, and the coolant flow rate supplied to each group of high power density battery energy storage systems is the same, so that the difference in the heat dissipation effect of each group of high power density battery energy storage systems is small.

[0069] The liquid supply main pipe 61 supplies cooling liquid to multiple groups of high power density battery energy storage systems, and the liquid return main pipe 62 returns cooling liquid to the liquid cooling unit 5, so that the paths of the liquid supply main pipe 61 and the liquid return main pipe 62 are long, the pipe diameter is wide, the pipe body strength is high, and deformation cannot occur. The liquid supply branch pipe group 63 only connects the corresponding high power density battery energy storage system and the liquid supply main pipe 61, and the liquid return branch pipe group 64 only connects the corresponding high power density battery energy storage system and the liquid return main pipe 62. The liquid supply branch pipe group 63 and the liquid return branch pipe group 64 can reduce the path and pipe diameter accordingly. In addition, the liquid supply branch pipe group 63 and the liquid return branch pipe group 64 can also have deformation and bending capabilities, that is, the liquid supply branch pipe group 63 and the liquid return branch pipe group 64 are flexible pipes.

[0070] In order to save the space occupied by the energy storage container and optimize the layout of each pipeline in the liquid cooling system, the liquid cooling unit 5 is located on one side of the multiple battery clusters 1, that is, the liquid cooling unit 5 and the multiple battery clusters 1 are arranged in the left-right direction. The liquid supply main pipe 61 and the liquid return main pipe 62 are located below the multiple battery clusters 1, and the main bodies of the liquid supply main pipe 61 and the liquid return main pipe 62 are also distributed in the left-right direction.

[0071] If a high power density battery energy storage system fails, it is necessary to power off the battery cluster 1, disconnect the liquid cooling system, and remove the battery pack 11 / main control box 2 from the battery cluster rack 3 for maintenance. 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 5, no longer supplying coolant to the liquid supply main pipe 61, and the coolant of each battery pack 11 flows back to the liquid return main pipe 62 through the corresponding liquid return branch pipe group 64, and finally gathers to the liquid cooling unit 5. After there is no coolant in the battery pack 11, the electrical module can be disassembled and assembled.

[0072] In the energy storage container provided by the utility model, the liquid supply main pipe 61 and the liquid return main pipe 62 are located below the multiple battery clusters 1, and the liquid supply main pipe 61 and the liquid return main pipe 62 do not block the battery pack 11 and the main control box 2. When disassembling and assembling the battery pack 11 and the main control box 2, there is no need to avoid the liquid supply main pipe 61 and the liquid return main pipe 62, which is convenient for disassembly and assembly; and the liquid inlet end of the liquid supply branch pipe group 63 and the liquid outlet end of the liquid return branch pipe group 64 are both located below the multiple groups of high-power density battery energy storage systems, and the liquid supply branch pipe group 63 and the liquid return branch pipe group 64 do not block the high-power density battery energy storage system, and are also convenient for implementing the on-off operation of the liquid supply branch pipe group 63 and the liquid supply main pipe 61, and the liquid return branch pipe group 64 and the liquid return main pipe 62, so as to improve the maintenance operation efficiency of the battery cluster 1;

[0073] In addition, due to the serious heat accumulation from the top solar radiation and the container body 4, the liquid supply main pipe 61 and the liquid return main pipe 62 are arranged below the multiple battery clusters 1, so that the liquid temperature inside the pipeline is basically not affected by the solar radiation and the heat accumulation in the box 4, the refrigeration energy efficiency is high, and the risk of leakage when the pipeline is set on the top is effectively avoided, making the high power density battery energy storage system safer to operate.

[0074] Before maintaining the battery pack 11 and the main control box 2, it is necessary to disconnect the liquid cooling system to drain the coolant in the battery pack 11; after the maintenance is completed, it is necessary to re-inject coolant into the battery pack 11. In the prior art, since the energy storage container has multiple high-power density battery energy storage systems, if a battery pack 11 of one of the high-power density battery energy storage systems 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 63 and liquid return branch pipe group 64 can be used as follows Figure 5 The structure shown, see Figure 5 Each liquid supply branch pipe group 63 is also provided with a first switch valve 65, and the first switch valve 65 is used to control the on-off of the liquid supply branch pipe group 63; each liquid return branch pipe group 64 is also provided with a second switch valve 66, and the second switch valve 66 is used to control the on-off of the liquid return branch pipe group 64.

[0075] In this embodiment, a first switch valve 65 is provided on each liquid supply branch pipe group 63, and a second switch valve 66 is provided on each liquid return branch pipe group 64. When a battery pack 11 of a battery cluster 1 needs maintenance, it is only necessary to close the corresponding liquid supply branch pipe group 63 through the first switch valve 65 and the corresponding liquid return branch pipe group 64 through the second switch valve 66, and then discharge the coolant in the battery cluster 1. After maintenance, new coolant can be injected. Therefore, the coolant consumed by replacing a battery pack 11 is only the coolant corresponding to a battery cluster 1, which is more cost-effective and avoids affecting other battery clusters 1.

[0076] In addition, the liquid supply branch pipe group 63 is provided with an air inlet 67, which is located behind the first switch valve 65. Figure 5 After the first switch valve 65 closes the corresponding liquid supply branch pipe group 63, air is introduced into the liquid supply branch pipe group 63 through the air inlet 67. Under the action of pressure, the coolant is pushed back to the liquid return branch pipe group 64. When the coolant in the liquid return branch pipe group 64 is completely discharged, the second switch valve 66 closes the liquid return branch pipe group 64.

[0077] 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 high power density battery energy storage system, characterized in that: include: A plurality of battery clusters (1) are arranged in an up-down direction; each battery cluster (1) comprises a plurality of battery packs (11) connected in series, and the plurality of battery packs (11) are arranged in an up-down direction; A main control box (2) is located below the multiple groups of battery clusters (1); the main control box (2) has multiple groups of electric control elements, and the multiple groups of electric control elements correspond to the multiple groups of battery clusters (1) one by one and are electrically connected; and A battery cluster frame (3); a plurality of groups of the battery clusters (1) and the main control box (2) are arranged on the battery cluster frame (3), and each group of the battery clusters (1) and the main control box (2) can slide on the battery cluster frame (3) in a front-rear direction.

2. The high power density battery energy storage system according to claim 1, characterized in that: The battery cluster frame (3) comprises: Two groups of support beam groups are symmetrically distributed along the left-right direction; each group of the support beam groups comprises a plurality of support beams (31) arranged in an up-down direction, each of the support beams (31) extends in a front-to-back direction, and the support beams (31) are correspondingly supported on a side edge of the bottom surface of one of the battery packs (11) / the main control box (2); and Two groups of column groups correspond one to one with the two groups of support beam groups; each group of the column groups comprises a plurality of columns (32), the columns (32) extending in the up-down direction, the columns (32) connecting the plurality of support beams (31) of the corresponding support beam group.

3. The high power density battery energy storage system according to claim 1, characterized in that: The front end surfaces of the plurality of battery packs (11) are flush with the front end surface of the main control box (2), and the length of the main control box (2) is shorter than the length of the battery packs (11).

4. An energy storage container, characterized in that: include: A box body (4); the front side panel of the box body (4) is a door panel, and the rear side panel of the box body (4) is closed; and The high power density battery energy storage system according to any one of claims 1 to 3 is arranged in the box (4).

5. The energy storage container according to claim 4, characterized in that: The high power density battery energy storage system is provided with a plurality of groups, and is arranged in a left-right direction in the box (4); The door panel comprises sub-door panels (41) corresponding one-to-one to the plurality of groups of the high-power density battery energy storage systems; the sub-door panels (41) are located directly in front of the corresponding high-power density battery energy storage systems when in a closed state.

6. The energy storage container according to claim 5, characterized in that: A plurality of groups of battery cluster frames (3) divide the inner cavity of the box body (4) into a plurality of sub-chamber bodies; The battery cluster frame (3) comprises two groups of support beams and two groups of columns symmetrically distributed along the left-right direction; each group of the support beams comprises a plurality of support beams (31) arranged in an up-down direction, each of the support beams (31) extending in a front-to-back direction, and the support beams (31) correspondingly support a side edge of the bottom surface of one of the battery packs (11) / the main control box (2); Each group of the upright columns comprises a plurality of upright columns (32), the upright columns (32) extending in the up-down direction, the upright columns (32) connecting the plurality of support beams (31) of the corresponding support beam group; Among them, the two adjacent groups of support beam groups of each two adjacent sub-bin bodies share one group of column groups.

7. The energy storage container according to claim 5, characterized in that: The energy storage container also includes: A liquid cooling unit (5) is arranged in the box (4) and is located on one side of the plurality of groups of high power density battery energy storage systems; the liquid cooling unit (5) is connected to a liquid supply main pipe (61) and a liquid return main pipe (62), and the liquid supply main pipe (61) and the liquid return main pipe (62) are distributed below the plurality of groups of high power density battery energy storage systems.

8. The energy storage container according to claim 7, characterized in that: Each of the high power density battery energy storage systems is connected to a liquid supply branch pipe group (63) and a liquid return branch pipe group (64); the liquid inlet end of the liquid supply branch pipe group (63) extends to the bottom of the corresponding high power density battery energy storage system and is connected to the liquid supply main pipe (61); the liquid outlet end of the liquid return branch pipe group (64) extends to the bottom of the corresponding high power density battery energy storage system and is connected to the liquid return main pipe (62).

9. The energy storage container according to claim 8, characterized in that: Each of the liquid supply branch pipe groups (63) is provided with a first switch valve (65); and each of the liquid return branch pipe groups (64) is provided with a second switch valve (66).

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