Battery energy storage system

Abstract

The utility model discloses a battery energy storage system, including support frame and interval setting on the support frame a plurality of battery package, and battery package includes liquid cooling board and battery module, and battery module sets up on liquid cooling board, is provided with first positioning portion on liquid cooling board, is provided with second positioning portion on support frame, and first positioning portion and second positioning portion can detachable connection. The utility model discloses a battery energy storage system through the detachable connection of first positioning portion and second positioning portion, makes liquid cooling board and support frame can realize the positioning cooperation, promotes the installation positioning precision of battery package, effectively enhances the installation stability and reliability of battery package and battery frame, reduces the situation of displacement after battery package installation.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery energy storage system. Background Technology

[0002] Battery energy storage systems are widely used in industrial and mining enterprises, business centers, and docks where power supply is insufficient or the power grid is unstable, as well as government agencies, research parks, and confidential departments that require uninterrupted power supply, in order to cope with sudden power outages or some temporary power needs.

[0003] Currently, traditional battery energy storage systems typically consist of a battery cabinet and a battery pack. The battery cabinet has multiple compartments spaced apart, each housing one battery pack. Existing technology has the following drawbacks: the battery pack is placed directly inside the battery cabinet, and when the battery energy storage system moves or is impacted, the battery pack may become unstable, shift, or even fall off. Utility Model Content

[0004] The purpose of this invention is to provide a battery energy storage system with a simple structure that can improve the installation and positioning accuracy of the battery pack and support frame.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A battery energy storage system is provided, including a support frame and a plurality of battery packs spaced apart on the support frame. The battery packs include a liquid cooling plate and battery modules. The battery modules are disposed on the liquid cooling plate. A first positioning part is provided on the liquid cooling plate, and a second positioning part is provided on the support frame. The first positioning part and the second positioning part are detachably connected.

[0007] As a preferred embodiment of the battery energy storage system, the battery pack further includes a positioning component, which is disposed on the liquid cooling plate and has a first positioning portion protruding from the side where the liquid cooling plate is connected to the support frame. The second positioning portion is a first positioning hole, and the first positioning portion can be inserted into the first positioning hole.

[0008] As a preferred embodiment of a battery energy storage system, the liquid cooling plate includes a detachably connected flow channel plate and a heat-conducting plate. The flow channel plate has a liquid cooling groove on the side facing the heat-conducting plate. The heat-conducting plate blocks the opening of the liquid cooling groove to form a liquid cooling flow channel. The battery module is disposed on the side of the heat-conducting plate away from the flow channel plate. The flow channel plate has a second positioning hole, which is spaced apart from the liquid cooling groove. A positioning element is partially inserted into the second positioning hole. The heat-conducting plate has a third positioning hole corresponding to the position of the second positioning hole, and a positioning element is partially inserted into the third positioning hole.

[0009] As a preferred embodiment of a battery energy storage system, the positioning element is interference-fitted with the second positioning hole and the third positioning hole, respectively.

[0010] As a preferred embodiment of the battery energy storage system, the battery pack further includes a housing, which is detachably connected to the liquid cooling plate. The housing has a receiving cavity for accommodating the battery module. The housing has an opening communicating with the receiving cavity on the side facing the liquid cooling plate, and the liquid cooling plate is used to seal the opening. The housing also has a fourth positioning hole on the side facing the liquid cooling plate. The positioning element has a third positioning part protruding from the side where the liquid cooling plate is connected to the housing, and the third positioning part can be inserted into the fourth positioning hole.

[0011] As a preferred embodiment of the battery energy storage system, the positioning element includes a bushing for pushing and pulling the battery pack, the bushing portion of which protrudes from the side of the liquid cooling plate opposite to the support frame.

[0012] As a preferred embodiment of the battery energy storage system, the battery pack further includes crossbeams, two of which are spaced apart along a first direction on the liquid cooling plate, and the length of the crossbeams extends along a second direction. The battery module is disposed on the crossbeams, and the first direction is perpendicular to the second direction.

[0013] As a preferred embodiment of a battery energy storage system, the battery module includes multiple battery cells and two end plates. The multiple battery cells are arranged side by side along the first direction to form a battery cell group. The two end plates are respectively arranged on both sides of the battery cell group along the first direction. The end plates are detachably connected to the side of the crossbeam away from the liquid cooling plate. The battery cell group is arranged between the two end plates.

[0014] As a preferred embodiment of the battery energy storage system, the battery pack further includes longitudinal beams, and a plurality of the longitudinal beams are spaced apart along the second direction on the liquid cooling plate, and the length of the longitudinal beams extends along the first direction and is connected to the crossbeams.

[0015] As a preferred embodiment of the battery energy storage system, the battery pack further includes two support beams, which are spaced apart along a second direction on the side of the liquid cooling plate away from the battery module, and the support beams abut against the support frame.

[0016] As a preferred embodiment of the battery energy storage system, the battery pack further includes a bottom protective plate. The support beam includes a first support portion and a second support portion. The first support portion is connected to the liquid cooling plate. The second support portion is provided on the side of the first support portion away from the liquid cooling plate. The two first support portions have adjacent first side surfaces. The second support portions and the first side surfaces are spaced apart along the second direction. The two second support portions are spaced apart to form a placement groove. The bottom protective plate is disposed in the placement groove.

[0017] As a preferred embodiment of the battery energy storage system, the support beam is hollow.

[0018] As a preferred embodiment of the battery energy storage system, the battery pack further includes a wire harness fixing member for securing the wire harnesses of the battery module, the wire harness fixing member being disposed on one side of the liquid cooling plate arranged along a first direction; and / or,

[0019] The battery pack also includes foam, and the foam is disposed on both sides of the liquid cooling plate along the first direction.

[0020] The beneficial effects of this utility model are as follows: the detachable connection between the first positioning part and the second positioning part enables the liquid cooling plate and the support frame to achieve positioning cooperation, improves the installation positioning accuracy of the battery pack, effectively enhances the installation stability and reliability of the battery pack and the battery frame, and reduces the possibility of displacement after the battery pack is installed. Attached Figure Description

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a schematic diagram of the battery energy storage system according to an embodiment of the present invention;

[0023] Figure 2 yes Figure 1 Enlarged view of point A;

[0024] Figure 3 This is an exploded view of the battery pack and support frame according to an embodiment of the present invention;

[0025] Figure 4 This is an exploded view of the battery pack according to an embodiment of the present invention;

[0026] Figure 5 This is an exploded view of the liquid cooling plate according to an embodiment of the present invention;

[0027] Figure 6 yes Figure 5 Enlarged view of point B;

[0028] Figure 7 This is a schematic diagram of the structure of the liquid cooling plate according to an embodiment of the present invention.

[0029] In the picture:

[0030] 1. Support frame; 11. First positioning hole; 2. Battery pack; 21. Liquid cooling plate; 211. Flow channel plate; 2111. Liquid cooling tank; 2112. Second positioning hole; 212. Heat conducting plate; 2121. Third positioning hole; 22. Positioning component; 23. Battery module; 231. Cell assembly; 2311. Cell; 232. End plate; 24. Housing; 241. Receiving cavity; 3. Crossbeam; 4. Longitudinal beam; 5. Support beam; 51. First support part; 511. First side; 52. Second support part; 6. Bottom guard plate; 7. Wiring harness fixing component; 8. Foam. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0032] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0035] like Figures 1 to 7 As shown, the battery energy storage system of this utility model embodiment includes a support frame 1 and a plurality of battery packs 2 spaced apart on the support frame 1. In this embodiment, the plurality of battery packs 2 are spaced apart on the support frame 1 in a vertical direction. The battery pack 2 includes a liquid cooling plate 21 and a battery module 23. The battery module 23 is disposed on the liquid cooling plate 21. A first positioning part is disposed on the liquid cooling plate 21, and a second positioning part is disposed on the support frame 1. The first positioning part and the second positioning part are detachably connected.

[0036] Understandably, the detachable connection between the first and second positioning parts enables the liquid cooling plate 21 and the support frame 1 to achieve positioning and engagement, improving the installation positioning accuracy of the battery pack 2, effectively enhancing the installation stability and reliability of the battery pack 2 and the battery frame, and reducing the possibility of displacement after installation. Furthermore, the battery pack 2 is connected to the support frame 1 via the liquid cooling plate 21, allowing the liquid cooling plate 21 to conduct heat through the support frame 1 and directly contact the external air, resulting in good heat dissipation and effectively improving the heat dissipation efficiency of the battery pack 2. In addition, the modular and detachable installation method, where multiple battery packs 2 can be installed in conjunction with the support frame 1 via the positioning component 22, facilitates flexible configuration of the number of battery packs 2 according to actual needs, improving the system's customizability and scalability.

[0037] In this embodiment, as Figure 1 , Figure 2 and Figure 3 As shown, the battery pack 2 also includes a positioning member 22, which is disposed on the liquid cooling plate 21. The positioning member 22 has a first positioning part protruding from the side where the liquid cooling plate 21 connects to the support frame 1, and a second positioning part is a first positioning hole 11, into which the first positioning part can be inserted. That is, through the insertion and cooperation of the first positioning part and the first positioning hole 11, the fitting accuracy between the liquid cooling plate 21 and the support frame 1 can be effectively improved. In addition, besides the form of setting the positioning member 22, the first positioning part can also be a positioning groove disposed on the liquid cooling plate 21, and the second positioning part can be a positioning part protruding from the support frame 1, with the positioning part inserted into the positioning groove, so as to realize the installation and positioning of the liquid cooling plate 21 and the support frame 1 of the battery pack 2. No further limitations are made here.

[0038] Specifically, in this embodiment, the support frame 1 includes two support parts spaced apart along the second direction, and each support part is provided with a first positioning hole 11. Therefore, the liquid cooling plate 21 is provided with two positioning elements 22 spaced apart along the second direction, and the two positioning elements 22 respectively cooperate with the first positioning holes 11 on the two support parts.

[0039] Furthermore, such as Figure 4 , Figure 5 and Figure 6 As shown, the liquid cooling plate 21 includes a detachably connected flow channel plate 211 and a heat-conducting plate 212. The flow channel plate 211 is provided with a liquid cooling groove 2111 on the side facing the heat-conducting plate 212. The heat-conducting plate 212 blocks the groove opening of the liquid cooling groove 2111 to form a liquid cooling flow channel. The battery module 23 is disposed on the side of the heat-conducting plate 212 away from the flow channel plate 211. The flow channel plate 211 is provided with a second positioning hole 2112, and the second positioning hole 2112 is spaced apart from the liquid cooling groove 2111. The positioning member 22 is partially inserted into the second positioning hole 2112. The heat-conducting plate 212 is provided with a third positioning hole 2121 at the position corresponding to the second positioning hole 2112. The positioning member 22 is partially inserted into the third positioning hole 2121. The detachable connection design of the flow channel plate 211 and the heat conduction plate 212 makes it more convenient to maintain and replace parts of the battery energy storage system, saving maintenance time and replacement costs. The positioning component 22 and the second positioning hole 2112 and the third positioning hole 2111 can achieve precise positioning and cooperation between the flow channel plate 211 and the heat conduction plate 212, ensuring the installation stability and assembly accuracy of the liquid cooling plate 21. In addition, the positioning component 22 can also cooperate with the support frame 1 to achieve precise positioning and installation of the battery pack 2, effectively enhancing the internal structure of the liquid cooling plate 21 and the installation stability and reliability of the liquid cooling plate 21 and the support frame 1.

[0040] Optionally, the positioning member 22 is interference-fitted with the second positioning hole 2112 and the third positioning hole 2111, respectively. This ensures that the positioning member 22 can define the position between the flow channel plate 211 and the heat conduction plate 212, and avoids the situation where there is a gap between the positioning member 22 and the second positioning hole 2112 or the third positioning hole 2111, which would prevent the positioning member 22 from being able to be positioned by abutting against the hole wall.

[0041] Furthermore, the battery pack 2 also includes a housing 24, which is detachably connected to the liquid cooling plate 21. The housing 24 has a receiving cavity 241 for accommodating the battery module 23. An opening communicating with the receiving cavity 241 is provided on the side of the housing 24 facing the liquid cooling plate 21, and the liquid cooling plate 21 is used to seal the opening. A fourth positioning hole is also provided on the side of the housing 24 facing the liquid cooling plate 21. The positioning member 22 has a third positioning part protruding from the side where the liquid cooling plate 21 connects to the housing 24, and the third positioning part can be inserted into the fourth positioning hole. Through the cooperation of the third positioning part and the fourth positioning hole, the positioning member 22 can effectively improve the installation accuracy and stability of the liquid cooling plate 21 and the housing 24. In summary, the positioning component 22 not only limits the connection accuracy between the inner flow channel plate 211 and the heat conduction plate 212 of the liquid cooling plate 21, but also plays a crucial role in improving the fit accuracy between the battery pack 2 housing 24 and the liquid cooling plate 21, ensuring the fit accuracy between the battery pack 2 and the support frame 1, thereby ensuring the relative position accuracy and installation stability of the housing 24, the liquid cooling plate 21 and the support frame 1.

[0042] Optionally, the positioning component 22 can be a positioning pin or a bolt. Taking the positioning pin as an example, the positioning pin is interference-fitted with the second positioning hole 2112 and the third positioning hole 2121 to ensure the fitting accuracy between the flow channel plate 211 and the heat conduction plate 212. The positioning pin protrudes from the end of the liquid cooling plate 21 away from the battery module 23 and is inserted into the first positioning hole 11 to achieve the function of positioning and connection fixation. The positioning pin protrudes from the side of the liquid cooling plate 21 adjacent to the battery module 23 and is inserted into the fourth positioning hole of the housing 24 to achieve the positioning and installation of the liquid cooling plate 21 and the housing 24.

[0043] In another embodiment, the positioning member 22 includes a bushing for pushing and pulling the moving battery pack 2, with a portion of the bushing protruding from the side of the liquid cooling plate 21 away from the support frame 1. The bushing is an existing commercially available part, convenient to purchase and use. The end of the bushing that protrudes from the liquid cooling plate 21 can not only act as a handle for workers to hold and pull, but the hollow design of the bushing can also allow tools such as hooks to be inserted for dragging, so as to pull out the battery pack 2 that is placed deep in the liquid cooling plate 2.

[0044] Furthermore, such as Figure 4 and Figure 5As shown, the battery pack 2 also includes crossbeams 3. At least two crossbeams 3 are spaced apart along a first direction (the first direction is the X direction shown in the figure) on the liquid cooling plate 21, and the length of the crossbeams 3 extends along a second direction (the second direction is the Y direction shown in the figure). The battery module 23 is disposed on the crossbeams 3, with the first direction and the second direction perpendicular to each other. The crossbeams 3 enhance the structural strength of the liquid cooling plate 21, reducing bending deformation, and also facilitate the positioning and installation of the battery module 23, improving the ease and accuracy of installation. In this embodiment, the crossbeams 3 are welded to the liquid cooling plate 21. The gap between the two crossbeams 3 is adjusted according to the battery module 23 with different required capacities to meet different production needs.

[0045] Specifically, such as Figure 4 As shown, the battery module 23 includes multiple battery cells 2311 and two end plates 232. The multiple battery cells 2311 are arranged side by side along a first direction to form a cell assembly 231. The two end plates 232 are respectively disposed on both sides of the cell assembly 231 along the first direction. The end plates 232 are detachably connected to the side of the crossbeam 3 away from the liquid cooling plate 21. The cell assembly 231 is disposed between the two end plates 232, that is, the end plates 232 and the crossbeam 3 are correspondingly disposed along a third direction (the third direction is the Z direction shown in the figure, i.e., the vertical direction), which is perpendicular to the first direction and the second direction, respectively. The cell assembly 231 formed by the multiple battery cells 2311 arranged side by side is surrounded by the two end plates 232, which can effectively improve the overall structural strength of the battery module 23 and prevent the cell assembly 231 from being damaged by external forces. At the same time, the cell assembly 231 is disposed between the two crossbeams 3, which can further stabilize the structural strength of the cell assembly 231. Of course, the detachable connection between the end plate 232 and the crossbeam 3 makes the battery module 23 more convenient to maintain, repair, or replace, and the operation is simple and the maintenance efficiency is high. In this embodiment, the battery pack 2 includes two battery modules 23, that is, four crossbeams 3 are spaced apart on the liquid cooling plate 21 for the end plates 232 of the two battery modules 23 to be connected.

[0046] Furthermore, the battery pack 2 also includes longitudinal beams 4. Multiple longitudinal beams 4 are spaced apart on the liquid cooling plate 21 along the second direction, and the length of the longitudinal beams 4 extends along the first direction and connects to the crossbeams 3. The arrangement of the longitudinal beams 4 further enhances the structural strength of the liquid cooling plate 21 and the stability of its installation structure.

[0047] In some embodiments, such as Figure 4 , Figure 5 and Figure 7As shown, the battery pack 2 also includes two support beams 5, which are spaced apart along the second direction on the side of the liquid cooling plate 21 opposite to the battery module 23. The support beams 5 abut against the support frame 1. The support beams 5 effectively enhance the structural stability of the liquid cooling plate 21 and the entire battery pack 2. Furthermore, the connection between the support beams 5 and the support frame 1 reduces frictional loss between the liquid cooling plate 21 and the support frame 1, ensuring the service life of the liquid cooling plate 21.

[0048] Furthermore, the battery pack 2 also includes a bottom protective plate 6. The support beam 5 includes a first support portion 51 and a second support portion 52. The first support portion 51 is connected to the liquid cooling plate 21. The second support portion 52 is provided on the side of the first support portion 51 away from the liquid cooling plate 21. The two first support portions 51 have adjacent first side surfaces 511. The second support portions and the first side surfaces 511 are spaced apart along a second direction. The two second support portions 52 form a placement groove, and the bottom protective plate 6 is disposed in the placement groove. By setting the bottom protective plate 6, the protection of the bottom of the liquid cooling plate 21 is effectively strengthened, and the safety of the liquid cooling plate 21 is improved. Moreover, the bottom protective plate 6 is disposed in the placement groove, and the support beam 5 can protect the bottom protective plate 6, ensuring the structural safety of the bottom protective plate 6. In this embodiment, the bottom protective plate 6 abuts against the first support portion and is detachably connected to the liquid cooling plate 21 by bolts, which effectively strengthens the relative structural stability of the liquid cooling plate 21, the support beam 5, and the bottom protective plate 6.

[0049] Optionally, the support beam 5 is hollow, effectively reducing its structural weight and saving costs. Furthermore, the battery pack 2 also includes a wire harness fixing member 7 for securing the wiring harnesses of the battery module 23. The wire harness fixing member 7 is located on one side of the liquid cooling plate 21 arranged along the first direction. The wire harness fixing member 7 facilitates the bundling and fixing of the wiring harnesses within the battery module 23 or other battery pack 2, ensuring orderly placement of the wiring harnesses, preventing wiring misalignment, and effectively improving the safety of the battery energy storage system.

[0050] Preferably, the battery pack 2 further includes foam 8, and foam 8 is provided on both sides of the liquid cooling plate 21 along the first direction. By providing foam 8, the possibility of leakage caused by the wiring harness of the battery module 23 being cut by the notch or angle of the liquid cooling plate 21 when it is led out is reduced, thereby improving the safety of the wiring harness when it is led out.

[0051] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery energy storage system, characterized in that, The device includes a support frame (1) and multiple battery packs (2) spaced apart on the support frame (1). Each battery pack (2) includes a liquid cooling plate (21) and a battery module (23). The battery module (23) is disposed on the liquid cooling plate (21). The liquid cooling plate (21) is provided with a first positioning part, and the support frame (1) is provided with a second positioning part. The first positioning part and the second positioning part are detachably connected.

2. The battery energy storage system according to claim 1, characterized in that, The battery pack (2) further includes a positioning member (22), which is disposed on the liquid cooling plate (21). The positioning member (22) has a first positioning part protruding from the side where the liquid cooling plate (21) is connected to the support frame (1). The second positioning part is a first positioning hole (11), and the first positioning part can be inserted into the first positioning hole (11).

3. The battery energy storage system according to claim 2, characterized in that, The liquid cooling plate (21) includes a detachably connected flow channel plate (211) and a heat-conducting plate (212). A liquid cooling groove (2111) is provided on the side of the flow channel plate (211) facing the heat-conducting plate (212). The heat-conducting plate (212) blocks the opening of the liquid cooling groove (2111) to form a liquid cooling flow channel. The battery module (23) is located on the side of the heat-conducting plate (212) away from the flow channel plate (211). The heat-conducting plate (211) is provided with a second positioning hole (2112), and the second positioning hole (2112) is spaced apart from the liquid cooling tank (2111). The positioning member (22) is partially inserted into the second positioning hole (2112). The heat-conducting plate (212) is provided with a third positioning hole (2121) corresponding to the position of the second positioning hole (2112). The positioning member (22) is partially inserted into the third positioning hole (2121).

4. The battery energy storage system according to claim 3, characterized in that, The positioning element (22) is interference-fitted with the second positioning hole (2112) and the third positioning hole (2121) respectively.

5. The battery energy storage system according to claim 2, characterized in that, The battery pack (2) also includes a housing (24), which is detachably connected to the liquid cooling plate (21). The housing (24) has a receiving cavity (241) for accommodating the battery module (23). The housing (24) has an opening communicating with the receiving cavity (241) on the side facing the liquid cooling plate (21). The liquid cooling plate (21) is used to block the opening. The housing (24) also has a fourth positioning hole on the side facing the liquid cooling plate (21). The positioning member (22) has a third positioning part protruding from the side where the liquid cooling plate (21) is connected to the housing. The third positioning part can be inserted into the fourth positioning hole.

6. The battery energy storage system according to claim 2, characterized in that, The positioning element (22) includes a bushing for pushing and pulling the battery pack, the bushing portion of which is exposed on the side of the liquid cooling plate (21) away from the support frame (1).

7. The battery energy storage system according to any one of claims 1-6, characterized in that, The battery pack (2) also includes a crossbeam (3), two crossbeams (3) are spaced apart on the liquid cooling plate (21) along a first direction, and the length of the crossbeam (3) extends along a second direction. The battery module (23) is disposed on the crossbeam (3), and the first direction is perpendicular to the second direction.

8. The battery energy storage system according to claim 7, characterized in that, The battery module (23) includes multiple battery cells (2311) and two end plates (232). The multiple battery cells (2311) are arranged side by side along the first direction to form a battery cell group (231). The two end plates (232) are respectively arranged on both sides of the battery cell group (231) along the first direction. The end plates (232) are detachably connected to the side of the crossbeam (3) away from the liquid cooling plate (21). The battery cell group (231) is arranged between the two end plates (232).

9. The battery energy storage system according to claim 7, characterized in that, The battery pack (2) also includes longitudinal beams (4), and a plurality of longitudinal beams (4) are spaced apart on the liquid cooling plate (21) along the second direction, and the length of the longitudinal beams (4) extends along the first direction and is connected to the crossbeam (3).

10. The battery energy storage system according to any one of claims 1-6, characterized in that, The battery pack (2) also includes two support beams (5), which are spaced apart along the second direction on the side of the liquid cooling plate (21) away from the battery module (23), and the support beams (5) abut against the support frame (1).

11. The battery energy storage system according to claim 10, characterized in that, The battery pack (2) also includes a bottom protective plate (6). The support beam (5) includes a first support part (51) and a second support part (52). The first support part (51) is connected to the liquid cooling plate (21). The second support part (52) is provided on the side of the first support part (51) away from the liquid cooling plate (21). The two first support parts (51) have adjacent first side surfaces (511). The second support part (52) and the first side surface (511) are spaced apart along the second direction. The two second support parts (52) form a placement groove at intervals. The bottom protective plate (6) is disposed in the placement groove.

12. The battery energy storage system according to claim 10, characterized in that, The support beam (5) is hollow.

13. The battery energy storage system according to any one of claims 1-6, characterized in that, The battery pack (2) further includes a wire harness fixing member (7) for fixing the wire harness of the battery module (23), the wire harness fixing member (7) being disposed on one side of the liquid cooling plate (21) arranged along a first direction; and / or, The battery pack (2) also includes foam (8), and the liquid cooling plate (21) is provided with foam (8) on both sides along the first direction.

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