Battery cluster and battery energy storage system

Abstract

Provided in the present application are a battery cluster and a battery energy storage system. The battery cluster comprises a battery rack, a plurality of battery modules, a high-voltage box, and a fire protection system. The plurality of battery modules are disposed on the battery rack, and are configured to connect to each other via high-voltage cables. The high-voltage box is disposed on the battery rack and is configured to connect to the plurality of interconnected battery modules via high-voltage cables. The fire protection system is disposed on the battery rack.

Description

Battery cluster and battery energy storage system

[0001] This application claims priority to Chinese Patent Application No. 202422422856X, filed on September 30, 2024, in the China Patent Office, the entire contents of which are incorporated herein by reference.

[0002] This application claims priority to Chinese Patent Application No. 202422422856X, filed on September 30, 2024, in the China Patent Office, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

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

[0004] A battery energy storage system mainly consists of a prefabricated cabin, a battery cluster, a fire extinguishing system, a liquid cooling system, and an electrical system. Among them, the battery cluster is the most core part, which is formed by connecting a plurality of battery packs and high-voltage boxes in series and installing them on a battery rack. The entire energy storage system is constructed by connecting a plurality of battery clusters in series and parallel.

[0005] In related technologies, the entire battery energy storage system usually integrates fire-fighting facilities. When a single battery cluster is verified, authenticated, or tested, the fire-fighting system at the battery energy storage system level is not integrated. In addition, during the normal operation of the battery energy storage system, the fire-fighting facilities respond to the entire battery energy storage system. SUMMARY

[0006] However, this arrangement does not provide fire protection when a single battery cluster is verified, authenticated, or tested, which poses a safety hazard. During the normal operation of the battery energy storage system, the single battery cluster cannot independently operate the fire-fighting function, and the fire caused by the heat runaway and heat runaway spread of the cluster level cannot be effectively managed, which can exacerbate heat runaway, spread, and fire, affect the safety performance of the battery cluster, cause safety accidents, and endanger personal safety and cause economic losses.

[0007] In a first aspect, the present application provides a battery cluster, comprising:

[0008] a battery rack;

[0009] a plurality of battery packs provided on the battery rack, wherein the plurality of battery packs are connected to each other by high-voltage cables;

[0010] a high-voltage box provided on the battery rack and connected to the plurality of battery packs connected to each other by high-voltage cables; and

[0011] a fire extinguishing system provided on the battery rack.

[0012] In a second aspect, the present application further provides a battery energy storage system, comprising the above-mentioned battery cluster. Beneficial effects

[0013] The battery cluster provided by the application comprises a battery rack, a plurality of battery plug-in boxes, a high-voltage box, and a fire extinguishing system. The plurality of battery plug-in boxes are arranged in the battery rack and are used to be connected to each other through high-voltage cables. The high-voltage box is arranged in the battery rack and is used to be connected to the plurality of battery plug-in boxes connected to each other through high-voltage cables. The fire extinguishing system is arranged in the battery rack. By independently integrating the fire extinguishing system in the battery cluster, the thermal safety management at the battery cluster level is realized, and the safety of a single battery cluster is improved.

[0014] The battery energy storage system provided by the application comprises the above-mentioned battery cluster. By independently integrating the fire extinguishing system in the battery cluster, the thermal safety management at the battery cluster level is realized, and the safety of a single battery cluster is improved. Therefore, the safety of the battery energy storage system is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 is a structural perspective view of the battery cluster provided by the application;

[0016] Fig. 2 is a structural perspective view of the battery cluster in Fig. 1 from another viewing angle;

[0017] Fig. 3 is a structural front view of the battery cluster in Fig. 1;

[0018] Fig. 4 is a structural left view of the battery cluster in Fig. 1;

[0019] Fig. 5 is a structural right view of the battery cluster in Fig. 1;

[0020] Fig. 6 is a structural top view of the battery cluster in Fig. 1;

[0021] Fig. 7 is a structural bottom view of the battery cluster in Fig. 1;

[0022] Fig. 8 is a structural perspective view of the battery cluster in Fig. 1 (without the fire extinguishing system and the liquid cooling system);

[0023] Fig. 9 is a partial structural perspective view of Fig. 8;

[0024] Fig. 10 is a structural perspective view of the fire extinguishing system in Fig. 1;

[0025] Fig. 11 is a structural perspective view of the fire extinguishing system in Fig. 10 from another viewing angle;

[0026] Fig. 12 is a structural perspective view of the liquid cooling system in Fig. 1;

[0027] Fig. 13 is a structural perspective view of the battery rack in Fig. 1;

[0028] Fig. 14 is a structural front view of the battery rack in Fig. 13;

[0029] Fig. 15 is a bottom view of the battery rack in Fig. 13.

[0030] BRIEF DESCRIPTION OF DRAWINGS

[0031] 100, battery cluster; 1, battery rack; 11, rack body; 12, foot structure; 121, mounting hole; 122, grounding point; 13, first guide rail group; 131, first mounting guide rail; 14, second guide rail group; 141, second mounting guide rail; 2, battery plug-in box; 21, gas fire-fighting inlet; 22, liquid cooling inlet; 23, liquid cooling outlet; 24, grounding terminal; 3, high-voltage cable; 4, high-voltage box; 5, fire-fighting system; 51, gas fire-fighting device in bag type; 511, fire-fighting gas cylinder; 512, fire-fighting gas pipe; 52, aerosol fire extinguishing device; 53, water spray fire extinguishing device; 531, fire-fighting water pipe; 532, spray head; 54, fire-fighting power supply; 55, fire-fighting host; 6, liquid cooling system; 61, liquid cooling pipe; 611, first-stage water inlet pipe; 612, second-stage water inlet pipe; 613, second-stage water return pipe; 614, first-stage water return pipe; 62, liquid cooling unit; 63, water replenishment tank; 7, signal line. Embodiments of the present application

[0032] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "below" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, and the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, and the horizontal height of the first feature is less than that of the second feature.

[0034] In the description of the present embodiment, the terms "up", "down", "left", "right", "front", "back" and other orientation or position relationships are based on the orientation or position relationship shown in the drawings, which is for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used to distinguish the description and have no special meaning.

[0035] The application provides a battery cluster, and Figs. 1 to 15 are structural schematic diagrams of the battery cluster provided by the application.

[0036] Please refer to Figs. 1 to 3, the battery cluster 100 comprises a battery rack 1, a plurality of battery packs 2, a high-voltage box 4, and a fire extinguishing system 5.

[0037] The battery rack 1 serves as a support structure and is used for fixing and organizing other components.

[0038] The plurality of battery packs 2 are installed on the battery rack 1 and are connected to each other through high-voltage cables 3, and provide required voltage and capacity through series connection or parallel connection.

[0039] The high-voltage box 4 is also installed on the battery rack 1 and is connected to the plurality of battery packs 2 through high-voltage cables 3, so as to ensure effective transmission and management of power. Specifically, the high-voltage box 4 is internally provided with a fuse and a battery management system (BMS), and through connection with the battery packs 2, the BMS performs electrical management on the plurality of battery packs 2 and provides electrical safety protection. The plurality of battery packs 2 are connected to interfaces B+ and B- of the high-voltage box 4, and current flows out from interfaces P+ and P- after passing through the high-voltage box 4. In addition, each battery pack 2 is also connected to signal lines 7, and the signal lines 7 are used for transmitting collected voltage and temperature data, and the data is then transmitted to the BMS in the high-voltage box 4, so that the BMS manages and monitors the entire battery cluster 100.

[0040] The fire extinguishing system 5 is integrated on the battery rack 1 and provides instant fire protection for possible thermal runaway or other emergency situations inside the single battery cluster 100.

[0041] In the technical solution of the application, the fire extinguishing system 5 is independently integrated in the battery cluster 100, so that thermal safety management at the level of the battery cluster 100 is realized, and the safety of the single battery cluster 100 is improved.

[0042] It can be understood that by integrating an independent fire extinguishing system 5 in each battery cluster 100, the safety of the battery energy storage system during the verification, certification and testing process at the cluster level can be ensured. During the operation of the battery energy storage system, the independent fire extinguishing system 5 can more quickly identify and respond to abnormal conditions within a single battery cluster 100, reducing the time interval from detection to action, improving emergency handling efficiency, and if a battery plug-in box 2 in a certain battery cluster 100 experiences thermal runaway, the independent fire extinguishing system 5 can quickly take measures to prevent the failure from spreading to other clusters, thereby reducing the possibility of overall system damage. The presence of the independent fire extinguishing system 5 can significantly improve the reliability and safety of the battery energy storage system, ensuring the normal operation of other clusters even if a failure occurs within a cluster, reducing downtime and economic losses, and during system operation, the independent fire extinguishing system 5 can more accurately allocate resources for fire fighting operations based on actual needs, avoiding unnecessary resource waste, and better adapting to differences between different clusters. In summary, by integrating an independent fire extinguishing system 5 in each battery cluster 100, thermal safety management at the battery cluster 100 level is achieved, improving the safety of individual battery clusters 100, providing higher safety assurance during the testing phase, and enhancing the stability and safety of the system during the operation of the battery energy storage system, improving the overall performance of the battery energy storage system.

[0043] In some possible implementations, referring to FIGS. 9-11, each battery plug-in box 2 is provided with a gas fire extinguishing inlet 21; the fire extinguishing system 5 includes a pack-type gas fire extinguishing device 51, which includes a fire extinguishing cylinder 511 and a fire extinguishing pipe 512 in communication with the fire extinguishing cylinder 511, and the fire extinguishing pipe 512 is provided with a plurality of fire extinguishing interfaces in communication with the plurality of gas fire extinguishing inlets 21. In these possible implementations, the fire extinguishing cylinder 511 serves as the core component of the fire extinguishing system 5, and the fire extinguishing cylinder 511 stores fire extinguishing gas such as perfluoroacetone, heptafluoropropane or nitrogen, which can be released quickly to suppress flames and prevent the spread of fire when a fire occurs. The fire extinguishing pipe 512 connects the fire extinguishing cylinder 511 and the gas fire extinguishing inlets 21 of each battery plug-in box 2 to ensure that the fire extinguishing gas can be accurately delivered to the interior of each battery plug-in box 2 that needs protection. The fire extinguishing pipe 512 is provided with a plurality of fire extinguishing interfaces that correspond one-to-one with the gas fire extinguishing inlets 21 of each battery plug-in box 2 and are in communication therewith. When the pack-type gas fire extinguishing device 51 is activated, the fire extinguishing gas is released from the fire extinguishing cylinder 511 through the fire extinguishing pipe 512 and directly enters the interior of the battery plug-in box 2 through the fire extinguishing interface, ensuring efficient and direct delivery of the fire extinguishing gas, which can quickly form a gas cover inside the battery plug-in box 2 to effectively suppress potential thermal runaway or fire, improve fire extinguishing efficiency, and ensure the safe operation of the battery cluster 100.

[0044] In some possible implementations, the fire extinguishing system 5 further comprises aerosol fire extinguishing devices 52 located above the plurality of battery boxes 2 and the high-voltage box 4. In these possible implementations, the aerosol fire extinguishing devices 52 are a fire extinguishing technology that uses aerosol particles, which can quickly generate a large number of aerosol particles at the fire scene, effectively isolating oxygen and reducing temperature, so as to quickly extinguish the fire. The aerosol fire extinguishing agent generally contains solid particles and gas, which can quickly disperse and fill the space when released, is relatively safe for electrical equipment, and does not leave residues. The aerosol fire extinguishing devices 52 are installed above the plurality of battery boxes 2 and the high-voltage box 4, so as to cover the entire protected area in the event of a fire. In the event that the bag-type gas fire extinguishing device 51 fails or cannot completely extinguish the fire, the aerosol fire extinguishing devices 52 can quickly intervene to provide additional fire extinguishing capacity, provide more comprehensive fire protection, and enhance the safety and reliability of the system.

[0045] In some possible implementations, the fire extinguishing system 5 further comprises water spray fire extinguishing devices 53, which include a fire water pipe 531 and a spray head 532. One end of the fire water pipe 531 is used to connect to a fire water source, and the other end of the fire water pipe 531 is connected to the spray head 532. The spray head 532 is located above the plurality of battery boxes 2 and the high-voltage box 4. In these possible implementations, the water spray fire extinguishing devices 53 provide multi-stage fire extinguishing capacity. Water is a traditional and efficient fire extinguishing medium that can quickly reduce the temperature of the fire scene. For initial fires or large-scale fires, the water spray fire extinguishing devices 53 can provide rapid cooling effects and effectively control the spread of the fire. Even if the bag-type gas fire extinguishing device 51 and the aerosol fire extinguishing device 52 have been started, the water spray fire extinguishing devices 53 can subsequently perform physical cooling to ensure that the fire is completely controlled. The water spray fire extinguishing devices 53 also provide supplementary fire extinguishing effects. Water can directly act on most combustible materials, including battery materials, to ensure that comprehensive fire extinguishing effects can be achieved even in complex fire conditions. The water spray fire extinguishing devices 53 can also cool the surrounding environment when a fire occurs, prevent the fire from further spreading, protect surrounding equipment, and reduce losses. In this way, by combining different types of fire extinguishing devices, a multi-level protection system can be constructed. Even if one type of fire extinguishing method fails, other systems can timely compensate, thereby improving the safety and stability of the overall system.

[0046] It can be understood that the fire-fighting system 5 can also include a fire-fighting power supply 54 and a fire-fighting host 55. The fire-fighting power supply 54 provides uninterrupted power supply for the entire fire-fighting system 5, can immediately switch power supply when the main power supply fails, and maintain the continuous operation of the fire-fighting system 5. The fire-fighting host 55 is the command center of the entire fire-fighting system 5, responsible for monitoring, controlling and managing the operation of all fire-fighting devices, capable of receiving signals from fire detectors, automatically starting corresponding fire-fighting devices, and monitoring their operating status. Through the stable power supply of the fire-fighting power supply 54, the intelligent control of the fire-fighting host 55, and the synergistic effect of the three fire-fighting equipment of gas, aerosol and water spray, the fire-fighting system 5 can effectively deal with the fire risk that may occur in the battery cluster 100, and ensure the safe operation of the battery cluster 100.

[0047] In some possible implementations, referring to FIGS. 9 and 12, each battery plug-in box 2 is provided with a liquid cooling inlet 22 and a liquid cooling outlet 23; the battery cluster 100 further includes a liquid cooling system 6, which includes a liquid cooling pipeline 61 and a liquid cooling unit 62. The liquid cooling pipeline 61 includes a primary water inlet pipe 611, a plurality of secondary water inlet pipes 612, a plurality of secondary water return pipes 613 and a primary water return pipe 614. One end of each of the plurality of secondary water inlet pipes 612 is in communication with the primary water inlet pipe 611, and the other end of each of the plurality of secondary water inlet pipes 612 is in communication with a liquid cooling inlet 22. One end of each of the plurality of secondary water return pipes 613 is in communication with a liquid cooling outlet 23, and the other end of each of the plurality of secondary water return pipes 613 is in communication with the primary water return pipe 614. The liquid cooling unit 62 is used for cooling the cooling liquid flowing out of the primary water return pipe 614, and making the cooled cooling liquid enter the primary water inlet pipe 611. In these possible implementations, the cooling liquid flows out of the cooling device of the liquid cooling unit 62 and is at a lower temperature,

[0048] The cooling liquid is distributed to the plurality of secondary water inlet pipes 612 through the primary water inlet pipe 611, and then enters the liquid cooling inlet 22 of each battery plug-in box 2. Inside the battery plug-in box 2, the cooling liquid flows through the battery, absorbs the heat generated by the operation of the battery, and the heated cooling liquid flows out of the liquid cooling outlet 23 of the battery plug-in box 2, is collected to the primary water return pipe 614 through the secondary water return pipe 613, and is sent back to the liquid cooling unit 62 for cooling. The heated cooling liquid is cooled by heat exchangers and other components, and the cooled cooling liquid enters the primary water inlet pipe 611 again to start a new cycle. This design of the liquid cooling system 6 can accurately and accurately deliver the cooling liquid to the inside of each battery plug-in box 2, effectively control the temperature of the battery in the battery plug-in box 2, improve the performance and life of the battery, and ensure the stability and safety of the operation of the battery cluster 100.

[0049] In some possible implementations, the liquid cooling system 6 further comprises a water supplement tank 63, which is in communication with the primary water inlet pipe 611 and / or the primary water return pipe 614 through a valve. In these possible implementations, the water supplement tank 63 supplements the cooling liquid lost due to evaporation or leakage in the cooling circulation system, and maintains the proper level of the cooling liquid in the cooling circulation system. The water supplement tank 63 is in communication with the primary water inlet pipe 611 or the primary water return pipe 614, and the inflow and outflow of the cooling liquid are controlled through a valve, so as to ensure that the cooling liquid can be supplemented in time in case of a decrease in the amount of the cooling liquid during operation, and to avoid a decrease in the heat dissipation efficiency or damage to the equipment due to insufficient cooling liquid.

[0050] In some possible implementations, referring to FIGS. 13-15, the battery rack 1 comprises a rack body 11 and a foot structure 12. The rack body 11 is provided with mounting cavities for accommodating a plurality of battery plug-in boxes 2 and a high-voltage box 4. The foot structure 12 is connected to the rack body 11 and is provided with mounting holes 121 for passing fasteners to detachably connect the battery cluster 100 to a prefabricated cabin of a battery energy storage system. In these possible implementations, the rack body 11 is the main structural part of the battery rack 1, providing rigidity and support. The mounting cavities are designed in the rack body 11 to accommodate and secure the plurality of battery plug-in boxes 2 and the high-voltage box 4, ensuring the safe and stable installation of the battery plug-in boxes 2 and the high-voltage box 4. The foot structure 12 is connected to the bottom of the rack body 11 to increase the stability of the entire battery rack 1. The mounting holes 121 are provided on the foot structure 12, which are used to pass fasteners such as bolts, screws, etc. When the battery cluster 100 needs to be connected to the prefabricated cabin of the battery energy storage system, the fasteners are passed through these mounting holes 121 to achieve the detachable connection of the battery cluster 100 to the prefabricated cabin. The detachable connection allows the battery cluster 100 to be quickly installed and detached between different scenarios or locations, facilitating transportation and on-site deployment. The detachable connection also provides convenience for the expansion of the battery energy storage system, allowing the battery cluster 100 to be easily added or removed as needed. Through the above design, the battery rack 1 not only provides stable support and protection for the battery plug-in boxes 2 and the high-voltage box 4, but also achieves quick and detachable connection with the prefabricated cabin of the battery energy storage system through the mounting holes 121 on the foot structure 12, improving the overall flexibility and maintenance efficiency of the system. Specifically, the mounting holes 121 are waist-shaped holes, which are a non-circular hole design, usually in the shape of an ellipse or other similar shapes. The waist-shaped hole has a larger contact area than the circular hole, improving the stability and shear resistance of the connection. The design of the waist-shaped hole can reduce the strict requirements for hole diameter and thread during assembly to some extent, thereby improving the flexibility and fault tolerance of assembly. By adjusting the size and shape of the waist-shaped hole, the load distribution of the fastener on the foot structure 12 can be optimized, reducing stress concentration, so that the connection between the battery cluster 100 and the prefabricated cabin of the battery energy storage system is more reliable and convenient.

[0051] In some possible implementation manners, the battery rack 1 further comprises a plurality of first guide rail groups 13, each of which comprises two first mounting rails 131 arranged on opposite cavity walls of the mounting cavity respectively, and the two first mounting rails 131 jointly bear the corresponding battery plug-in box 2. In these possible implementation manners, the two first mounting rails 131 are arranged on the opposite cavity walls of the mounting cavity respectively, forming a symmetrical layout, and the two first mounting rails 131 jointly bear the corresponding battery plug-in box 2, so as to ensure the balanced support of the battery plug-in box 2, the stability of the battery plug-in box 2 in the mounting cavity, and the stability of the battery plug-in box 2 when subjected to external impact or vibration, thereby reducing the risk of movement or tilting. The symmetrically distributed first mounting rails 131 also provide a guiding function for the battery plug-in box 2, facilitating the sliding installation and disassembly of the battery plug-in box 2, and improving the stability, safety and maintenance efficiency.

[0052] In some possible implementation manners, the battery rack 1 further comprises a second guide rail group 14 comprising two second mounting rails 141 arranged on opposite cavity walls of the mounting cavity respectively, and the two second mounting rails 141 jointly bear the high-voltage box 4. In these possible implementation manners, the two second mounting rails 141 are symmetrically arranged on the opposite cavity walls of the mounting cavity, so as to ensure the balanced support and stable fixation of the high-voltage box 4, the safe positioning of the high-voltage box 4 in the battery rack 1, and the avoidance of safety hazards caused by vibration or movement. The second guide rail group 14 also has a guiding function, facilitating the installation and disassembly of the high-voltage box 4. It can be understood that the high-voltage box 4 usually contains key components such as a battery management system (BMS), and the design of the second guide rail group 14 makes the maintenance and inspection of the high-voltage box 4 more convenient, thereby improving the maintainability of the system.

[0053] In some possible implementations, referring to FIG. 9 and FIG. 13, each battery cubby 2 is provided with a grounding terminal 24, and the base structure 12 is further provided with grounding points 122, which are respectively connected with the plurality of grounding terminals 24. In these possible implementations, the grounding terminal 24 is arranged on the battery cubby 2 to provide a low-impedance path to quickly guide abnormal current to the ground in the event of an electrical fault, thereby protecting the battery and circuit from damage and ensuring the safety of the operator. The grounding point 122 is arranged on the base structure 12 of the battery rack 1 as part of the grounding system, connected with the grounding terminal 24 of the battery cubby 2 to form a common grounding plane to ensure the safety of the electrical system. It should be noted that the number of grounding points 122 is not specifically limited in the present application. For example, a plurality of grounding points 122 can be provided, and each of the plurality of grounding points 122 is respectively connected with the plurality of grounding terminals 24 of the plurality of battery cubbies 2. Such a design helps to disperse the grounding current, reduce the pressure on a single connection point, and improve the grounding continuity and reliability of the entire system. It also helps to maintain the equipotential of the electrical system, reduces the risk of electric shock caused by potential difference, and so on. For example, the number of grounding points 122 is less than the number of battery cubbies 2 (grounding terminals 24), and the remaining battery cubbies 2 share these grounding points 122 through appropriate electrical connections to form an effective grounding path. The grounding capacity and contact resistance can also be compensated by increasing the cross-sectional area of the grounding wire or optimizing the grounding path to maintain sufficient grounding capacity and reduce contact resistance. That is, the number of grounding points 122 depends on the size of the battery energy storage system, design requirements, and safety standards, and can be determined according to specific design specifications and safety requirements.

[0054] The present application also provides a battery energy storage system, which comprises the battery cluster 100. The battery cluster 100 independently integrates the fire extinguishing system 5, thereby improving the safety of the single battery cluster 100 and effectively improving the safety of the battery energy storage system.

Claims

1. A battery cluster (100) comprising: a battery rack (1) ; a plurality of battery bays (2) arranged in the battery rack (1), the plurality of battery bays (2) being configured to be connected to each other by high-voltage cables (3) ; a high-voltage cabinet (4) arranged in the battery rack (1) and configured to be connected to the plurality of battery bays (2) connected to each other by high-voltage cables (3) ; and a fire extinguishing system (5) arranged in the battery rack (1).

2. The battery cluster (100) according to claim 1, wherein Each of the battery bays (2) is provided with a gas fire extinguishing inlet (21) ; the fire extinguishing system (5) comprises a gas fire extinguishing device (51) in the form of a bag, the gas fire extinguishing device (51) comprising a fire extinguishing gas cylinder (511) and a fire extinguishing gas pipe (512), the fire extinguishing gas pipe (512) being in communication with the fire extinguishing gas cylinder (511), the fire extinguishing gas pipe (512) being provided with a plurality of fire extinguishing interfaces, the plurality of fire extinguishing interfaces being in communication with the plurality of gas fire extinguishing inlets (21), respectively.

3. The battery cluster (100) according to claim 2, wherein The fire extinguishing system (5) further comprises an aerosol fire extinguishing device (52), the aerosol fire extinguishing device (52) being located above the plurality of battery bays (2) and the high-voltage cabinet (4).

4. The battery cluster (100) according to claim 3, wherein The fire extinguishing system (5) further comprises a water spray fire extinguishing device (53), the water spray fire extinguishing device (53) comprising a fire water pipe (531) and a spray head (532), one end of the fire water pipe (531) being configured to be connected to a fire water source, the other end of the fire water pipe (531) being connected to the spray head (532), the spray head (532) being located above the plurality of battery bays (2) and the high-voltage cabinet (4).

5. The battery cluster (100) according to any one of claims 1 to 4, wherein Each of the battery bays (2) is provided with a liquid cooling inlet (22) and a liquid cooling outlet (23) ; The battery cluster (100) further comprises a liquid cooling system (6), the liquid cooling system (6) comprising: a liquid cooling pipeline (61), the liquid cooling pipeline (61) comprising a primary water inlet pipe (611), a plurality of secondary water inlet pipes (612), a plurality of secondary water outlet pipes (613) and a primary water outlet pipe (614), one end of each of the plurality of secondary water inlet pipes (612) being in communication with the primary water inlet pipe (611), the other end of each of the plurality of secondary water inlet pipes (612) being in communication with the plurality of liquid cooling inlets (22), respectively, one end of each of the plurality of secondary water outlet pipes (613) being in communication with the plurality of liquid cooling outlets (23), respectively, the other end of each of the plurality of secondary water outlet pipes (613) being in communication with the primary water outlet pipe (614) ; and a liquid cooling unit (62) configured to cool the cooling liquid flowing out of the primary water outlet pipe (614) and to make the cooled cooling liquid enter the primary water inlet pipe (611).

6. The battery cluster (100) according to claim 5, wherein The liquid cooling system (6) further comprises a water supplement tank (63), the water supplement tank (63) being in communication with the primary water inlet pipe (611) and / or the primary water outlet pipe (614) by a valve.

7. The battery cluster (100) according to any one of claims 1 to 6, wherein The battery rack (1) comprises: a rack body (11) provided with a mounting cavity, the mounting cavity accommodating the plurality of battery bays (2) and the high-voltage cabinet (4) ; and A bottom structure (12) is connected with the rack body (11), and the bottom structure (12) is provided with a mounting hole (121) for penetrating a fastener to detachably connect the battery cluster (100) with a prefabricated cabin of a battery energy storage system.

8. The battery cluster (100) according to claim 7, wherein The battery rack (1) further comprises: a plurality of first guide rail groups (13), each first guide rail group (13) comprising two first mounting guide rails (131) respectively arranged on the opposite two cavity walls of the mounting cavity, and the two first mounting guide rails (131) jointly bearing the corresponding battery plug-in box (2); and / or, a second guide rail group (14) comprising two second mounting guide rails (141) respectively arranged on the opposite two cavity walls of the mounting cavity, and the two second mounting guide rails (141) jointly bearing the high-voltage box (4).

9. The battery cluster (100) of claim 7, wherein, Each battery plug-in box (2) is provided with a grounding terminal (24), and the bottom structure (12) is further provided with a grounding point (122) connected with the plurality of grounding terminals (24).

10. A battery energy storage system comprising the battery cluster (100) according to any one of claims 1 to 9.

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