Battery cluster and battery energy storage system

Abstract

The utility model relates to a battery cluster and a battery energy storage system, the battery cluster 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 on the battery rack, and the plurality of battery plug-in boxes are used for mutual connection through high-voltage cables; the high-voltage box is arranged on the battery rack and is used for being connected with the plurality of mutually connected battery plug-in boxes through high-voltage cables; and the fire extinguishing system is arranged on the battery rack. The fire extinguishing system is independently integrated in the battery cluster, so that the thermal safety management of the battery cluster level is realized, and the safety of a single battery cluster is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery energy storage, and in particular to a battery cluster and a battery energy storage system. BACKGROUND

[0002] The battery energy storage system mainly consists of prefabricated cabins, battery clusters, fire extinguishing systems, liquid cooling systems and electrical systems. Among them, the battery cluster is the most core part, which is formed by connecting multiple battery packs (Packs) and high-voltage boxes in series and installing them on the battery rack. The entire energy storage system is constructed by connecting multiple battery clusters in series and parallel.

[0003] It is worth noting that although the entire battery energy storage system usually integrates fire-fighting facilities, when a single battery cluster is verified, certified or tested, it is usually done independently of the entire system. This means that during testing, the battery energy storage system level fire extinguishing system is not integrated, and there is actually no fire protection at this time, which poses a safety hazard. In addition, during the normal operation of the battery energy storage system, the centralized fire extinguishing system cannot independently operate the fire extinguishing function for a single battery cluster. Due to the design and layout of the system, the centralized fire extinguishing system cannot effectively respond to a single battery cluster. Once the battery pack (Pack) in a certain battery cluster experiences thermal runaway, it is difficult to prevent it from spreading to other adjacent battery packs (Packs), thereby causing a fire or even an explosion. Due to the lack of cluster-level fire protection measures, it is difficult to effectively manage the cluster-level thermal runaway and the fire caused by the spread of thermal runaway, which can exacerbate thermal runaway, exacerbate the spread of thermal runaway, and exacerbate the fire, affecting the safety performance of the battery cluster, causing safety accidents, and endangering personal safety and causing economic losses. CONTENT OF THE UTILITY MODEL

[0004] The embodiments of the present application provide a battery cluster and a battery energy storage system, which realize thermal safety management at the battery cluster level and improve the safety of a single battery cluster to at least partially solve the above technical problems.

[0005] In order to achieve the above-mentioned purpose, according to the first aspect of the present application, a battery cluster is provided, comprising:

[0006] a battery rack;

[0007] 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;

[0008] 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

[0009] a fire extinguishing system provided on the battery rack.

[0010] Optionally, each battery pack is provided with a gas fire extinguishing inlet.

[0011] The fire extinguishing system comprises an in-bag type gas fire extinguishing device, the in-bag type gas fire extinguishing device comprises a fire extinguishing gas cylinder and a fire extinguishing gas pipe, the fire extinguishing gas pipe is in communication with the fire extinguishing gas cylinder, and the fire extinguishing gas pipe is provided with a plurality of fire extinguishing interfaces, and the plurality of fire extinguishing interfaces are respectively in communication with the plurality of gas fire extinguishing inlets.

[0012] Optionally, the fire extinguishing system further comprises an aerosol fire extinguishing device, and the aerosol fire extinguishing device is located above the plurality of battery insertion boxes and the high-voltage box.

[0013] Optionally, the fire extinguishing system further comprises a water spray fire extinguishing device, and the water spray fire extinguishing device comprises a fire extinguishing water pipe and a spray head, one end of the fire extinguishing water pipe is used for connecting a fire extinguishing water source, the other end of the fire extinguishing water pipe is connected to the spray head, and the spray head is located above the plurality of battery insertion boxes and the high-voltage box.

[0014] Optionally, each battery insertion box is provided with a liquid cooling inlet and a liquid cooling outlet.

[0015] The battery cluster further comprises a liquid cooling system, and the liquid cooling system comprises:

[0016] a liquid cooling pipeline, the liquid cooling pipeline comprises a primary water inlet pipe, a plurality of secondary water inlet pipes, a plurality of secondary water return pipes and a primary water return pipe, one end of each of the plurality of secondary water inlet pipes is in communication with the primary water inlet pipe, the other end of each of the plurality of secondary water inlet pipes is in communication with a plurality of liquid cooling inlets, one end of each of the plurality of secondary water return pipes is in communication with a plurality of liquid cooling outlets, and the other end of each of the plurality of secondary water return pipes is in communication with the primary water return pipe; and

[0017] a liquid cooling unit for cooling the cooling liquid flowing out of the primary water return pipe and allowing the cooled cooling liquid to enter the primary water inlet pipe.

[0018] Optionally, the liquid cooling system further comprises a water supplement tank, and the water supplement tank is in communication with the primary water inlet pipe and / or the primary water return pipe through a valve.

[0019] Optionally, the battery rack comprises:

[0020] a rack body provided with a mounting cavity, the mounting cavity is used for accommodating the plurality of battery insertion boxes and the high-voltage box; and

[0021] a foot structure connected to the rack body, the foot structure is provided with a mounting hole, and the mounting hole is used for penetrating a fastener to allow the battery cluster to be detachably connected to a prefabricated cabin of a battery energy storage system.

[0022] Optionally, the battery rack further comprises:

[0023] a plurality of first guide rail groups, each first guide rail group comprising two first mounting guide rails, the two first mounting guide rails being respectively arranged on two opposite cavity walls of the mounting cavity, and the two first mounting guide rails jointly bearing the corresponding battery plug-in box; and / or,

[0024] a second guide rail group comprising two second mounting guide rails, the two second mounting guide rails being respectively arranged on two opposite cavity walls of the mounting cavity, and the two second mounting guide rails jointly bearing the high-voltage box.

[0025] Optionally, each battery plug-in box is provided with a grounding terminal, and the bottom foot structure is further provided with a grounding point, and the grounding point is connected with the plurality of grounding terminals.

[0026] According to a second aspect of the present application, a battery energy storage system is provided, comprising the battery cluster according to any one of the above.

[0027] In the battery cluster of the embodiments of the present application, the battery cluster 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, the plurality of battery plug-in boxes are used to be connected with each other through high-voltage cables, the high-voltage box is arranged in the battery rack and is used to be connected with the plurality of battery plug-in boxes connected with each other through high-voltage cables, and 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.

[0028] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0030] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, wherein the same reference numerals in the following description represent the same parts.

[0031] Figure 1 is a structural perspective view of the battery cluster provided in the exemplary embodiments of the present disclosure;

[0032] Figure 2 is Figure 1 is another perspective structural view of the battery cluster in

[0033] Figure 3 is Figure 1The structural front view of the battery cluster;

[0034] Figure 4 yes Figure 1 The left side view of the battery cluster structure;

[0035] Figure 5 yes Figure 1 The right side view of the battery cluster structure;

[0036] Figure 6 yes Figure 1 A top view of the battery cluster structure;

[0037] Figure 7 yes Figure 1 A bottom view of the structure of the battery cluster;

[0038] Figure 8 yes Figure 1 A three-dimensional diagram of the battery cluster structure (without the fire protection system and liquid cooling system)

[0039] Figure 9 yes Figure 8 A three-dimensional diagram of the local structure

[0040] Figure 10 yes Figure 1 Structural stereogram of the fire protection system in the;

[0041] Figure 11 yes Figure 10 A structural stereogram of the fire protection system from another perspective;

[0042] Figure 12 yes Figure 1 A structural perspective diagram of the liquid cooling system;

[0043] Figure 13 yes Figure 1 The structural stereogram of the battery rack;

[0044] Figure 14 yes Figure 13 The main structural view of the battery rack;

[0045] Figure 15 yes Figure 13 Bottom view of the battery rack in Figure 1.

[0046] Description of reference numerals:

[0047] 100, battery cluster; 1, battery rack; 11, rack body; 12, foot structure; 121, mounting hole; 122, grounding point; 13, first rail group; 131, first mounting rail; 14, second rail group; 141, second mounting rail; 2, battery pack; 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; 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. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person skilled in the art without creative labor fall within the protection scope of the present application.

[0049] The present application provides a battery cluster, please refer to Figures 1 to 3 , Figures 1 to 15 The structural schematic diagram of the battery cluster provided by the embodiments of the present application.

[0050] The battery cluster 100 comprises a battery rack 1, a plurality of battery packs 2, a high-voltage box 4, and a fire-fighting system 5.

[0051] The battery rack 1 serves as a support structure for fixing and organizing other components.

[0052] The plurality of battery packs 2 (packs) are installed on the battery rack 1 and are connected to each other through high-voltage cables 3, and provide the required voltage and capacity through series or parallel connection.

[0053] The high-voltage box 4 is also mounted on the battery rack 1 and connected with the plurality of interconnected battery plug-in boxes 2 through the high-voltage cable 3 to ensure the effective transmission and management of power. Specifically, the high-voltage box 4 is internally provided with a fuse and a battery management system (BMS) to conduct electrical management on the entire cluster of battery plug-in boxes 2 and provide electrical safety protection. The cluster of battery plug-in boxes 2 (Pack) is connected to the interfaces B+ and B- of the high-voltage box 4, and the current flows out from the interfaces P+ and P- after passing through the high-voltage box 4. In addition, each battery plug-in box 2 (Pack) is also connected with signal lines 7, which are used to transmit the collected voltage and temperature data, and the data is then transmitted to the BMS built-in the high-voltage box 4 for management and monitoring of the entire battery cluster 100.

[0054] The fire-fighting system 5 is integrated on the battery rack 1 to provide instant fire-fighting protection for the possible thermal runaway or other emergency situations inside the single battery cluster 100.

[0055] In the technical solution of the present application, the independent integration of the fire-fighting system 5 in the battery cluster 100 realizes the thermal safety management at the battery cluster 100 level and improves the safety of the single battery cluster 100.

[0056] It can be understood that the independent integration of the fire-fighting system 5 in each battery cluster 100 can guarantee the safety of the battery energy storage system in the cluster level verification, certification and testing process. During the operation of the battery energy storage system, the independent fire-fighting system 5 can more quickly identify and respond to abnormal situations inside the single battery cluster 100, reduce the time interval from detection to action, improve the emergency handling efficiency, and if the battery plug-in box 2 in a certain battery cluster 100 experiences thermal runaway, the independent fire-fighting system 5 can take measures quickly to prevent the fault from spreading to other clusters, thereby reducing the possibility of overall system damage. The existence of the independent fire-fighting system 5 can significantly improve the reliability and safety of the battery energy storage system, and even if a fault occurs in one cluster, it can also guarantee the normal operation of other clusters as much as possible, reduce downtime and economic losses, and during the operation of the system, the independent fire-fighting system 5 can more accurately allocate resources for fire-fighting operations according to actual needs, avoid unnecessary waste of resources, and better adapt to the differences between different clusters. In general, the independent integration of the fire-fighting system 5 in the battery cluster 100 realizes the thermal safety management at the battery cluster 100 level and improves the safety of the single battery cluster 100. Not only does it provide higher safety protection in the testing stage, but it also enhances the stability and safety of the system during the operation of the battery energy storage system and improves the overall performance of the battery energy storage system.

[0057] In some embodiments, please refer to Figures 9 to 11Each battery plug-in box 2 is provided with a gas fire-fighting inlet 21; the fire-fighting system 5 comprises a pack-type gas fire-fighting device 51, which comprises a fire-fighting gas cylinder 511 and a fire-fighting gas pipe 512 in communication with the fire-fighting gas cylinder 511, and the fire-fighting gas pipe 512 is provided with a plurality of fire-fighting interfaces in communication with the plurality of gas fire-fighting inlets 21. In these embodiments, the fire-fighting gas cylinder 511 serves as the core component of the fire-fighting system 5, and the fire-fighting gas cylinder 511 stores fire-fighting gas such as perfluoroacetone, heptafluoropropane or nitrogen, which can be rapidly released to suppress flames and prevent fire spread when a fire occurs. The fire-fighting gas pipe 512 connects the fire-fighting gas cylinder 511 and the gas fire-fighting inlets 21 of each battery plug-in box 2 to ensure that the fire-fighting gas can be accurately delivered to the interior of each battery plug-in box 2 that needs protection. The fire-fighting gas pipe 512 is provided with a plurality of fire-fighting interfaces that correspond to and communicate with the gas fire-fighting inlets 21 of each battery plug-in box 2. When the pack-type gas fire-fighting device 51 is activated, the fire-fighting gas is released from the fire-fighting gas cylinder 511 through the fire-fighting gas pipe 512 and directly enters the interior of the battery plug-in box 2 through the fire-fighting interface, ensuring efficient and direct delivery of fire-fighting gas and rapidly forming a gas cover inside the battery plug-in box 2 to effectively suppress potential thermal runaway or fire and improve fire extinguishing efficiency, thereby ensuring the safe operation of the battery cluster 100.

[0058] In some embodiments, the fire-fighting system 5 further comprises an aerosol fire extinguishing device 52 located above the plurality of battery plug-in boxes 2 and the high-voltage box 4. In these embodiments, the aerosol fire extinguishing device 52 is a fire extinguishing technology that uses aerosol particles to rapidly generate a large number of aerosol particles at the fire scene, which can effectively isolate oxygen and reduce temperature to quickly extinguish the fire. The aerosol fire extinguishing agent generally contains solid particles and gas, which can rapidly disperse and fill the space when released, and is relatively safe for electrical equipment without leaving residues. The aerosol fire extinguishing device 52 is installed above the plurality of battery plug-in boxes 2 and the high-voltage box 4 to cover the entire protected area in the event of a fire. In the event that the pack-type gas fire-fighting device 51 fails or cannot completely extinguish the fire, the aerosol fire extinguishing device 52 can quickly intervene to provide additional fire extinguishing capacity, provide more comprehensive fire protection, and enhance the safety and reliability of the system.

[0059] In some embodiments, the fire-fighting system 5 further comprises a water spray fire extinguishing device 53, which comprises a fire water pipe 531 and a spray head 532, one end of the fire water pipe 531 is used to connect a fire water source, the other end of the fire water pipe 531 is connected to the spray head 532, and the spray head 532 is located above the plurality of battery cabinets 2 and the high-voltage cabinet 4. In these embodiments, the water spray fire extinguishing device 53 provides multi-stage fire extinguishing capability, and water as a traditional and efficient fire extinguishing medium can quickly reduce the temperature of the fire scene. For initial fire or large-scale fire, the water spray fire extinguishing device 53 can provide rapid cooling effect to effectively control the spread of fire. Even if the package-type gas fire extinguishing device 51 and the aerosol fire extinguishing device 52 have been started, the water spray fire extinguishing device 53 can subsequently perform physical cooling to ensure that the fire is completely controlled. The water spray fire extinguishing device 53 also provides a supplementary fire extinguishing effect, and water can directly act on most combustible materials, including battery materials, to ensure that comprehensive fire extinguishing effect can be achieved even in complex fire conditions. In addition, the water spray fire extinguishing device 53 can 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-fighting devices, a multi-level protection system can be constructed. Even if one type of fire extinguishing method fails, other systems can timely compensate to improve the safety and stability of the overall system.

[0060] It can be understood that the fire-fighting system 5 can further comprise 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, can receive signals from the fire detector, automatically start the corresponding fire-fighting device, and monitor its operation state. 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 gas, aerosol and water spray fire-fighting equipment, the fire-fighting system 5 can effectively cope with the fire risk that may occur in the battery cluster 100 and ensure the safe operation of the battery cluster 100.

[0061] In some embodiments, please refer to Figure 9 and Figure 12Each battery plug-in box 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, which comprises a liquid cooling pipeline 61 and a liquid cooling unit 62. The liquid cooling pipeline 61 comprises 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 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 outlet pipes 613 is in communication with a liquid cooling outlet 23, and the other end of each of the plurality of secondary water outlet pipes 613 is in communication with the primary water outlet pipe 614. The liquid cooling unit 62 is used 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. In these embodiments, the cooling liquid flows out of the cooling device of the liquid cooling unit 62 and is at a lower temperature,

[0062] 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 outlet pipe 614 through the secondary water outlet pipe 613, and is sent back to the liquid cooling unit 62 for cooling. The heat is dissipated through a heat exchanger or the like, the cooling liquid is cooled again, the cooled cooling liquid enters the primary water inlet pipe 611 again, and a new cycle begins. 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.

[0063] In some embodiments, the liquid cooling system 6 further comprises a water supplement tank 63 in communication with the primary water inlet pipe 611 and / or the primary water outlet pipe 614 through a valve. In these embodiments, the water supplement tank 63 supplements the cooling liquid lost due to evaporation or leakage in the cooling circulation system, and maintains the appropriate 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 outlet pipe 614, and the inflow and outflow of the cooling liquid are controlled through a valve. This can ensure that the cooling liquid can be supplemented in time in the case of a decrease in the amount of cooling liquid during operation, and avoid the decrease in heat dissipation efficiency or damage to the equipment due to insufficient cooling liquid.

[0064] In some embodiments, please refer to Figures 13 to 15, the battery rack 1 includes a rack body 11 provided with mounting cavities accommodating a plurality of battery plug-in boxes 2 and high-voltage boxes 4, and a foot structure 12 connected with the rack body 11 and provided with mounting holes 121 for passing fasteners to detachably connect the battery cluster 100 with a prefabricated cabin of a battery energy storage system. In these embodiments, 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 high-voltage boxes 4, ensuring the safe and stable installation of the battery plug-in boxes 2 and high-voltage boxes 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, and 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 with 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 with the prefabricated cabin, which allows the battery cluster 100 to be quickly installed and detached between different scenarios or locations, facilitating transportation and on-site deployment, and the detachable connection also provides convenience for the expansion of the battery energy storage system, allowing easy addition or removal of battery clusters 100 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 high-voltage boxes 4, but also realizes 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, waist-shaped holes have a larger contact area than circular holes, improving the stability and shear resistance of the connection, the design of waist-shaped holes 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, making the connection between the battery cluster 100 and the prefabricated cabin of the battery energy storage system more reliable and convenient.

[0065] In some embodiments, the battery rack 1 further comprises a plurality of first guide rail groups 13, each first guide rail group 13 comprising two first mounting rails 131 respectively arranged on the opposite two cavity walls of the mounting cavity, and the two first mounting rails 131 jointly bear the corresponding battery plug-in box 2. In these embodiments, the two first mounting rails 131 are arranged on the opposite two 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 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, 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 stability, safety and maintenance efficiency.

[0066] In some embodiments, the battery rack 1 further comprises a second guide rail group 14 comprising two second mounting rails 141 respectively arranged on the opposite two cavity walls of the mounting cavity, and the two second mounting rails 141 jointly bear the high-voltage box 4. In these embodiments, the two second mounting rails 141 are symmetrically arranged on the opposite two cavity walls of the mounting cavity 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 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, improving the maintainability of the system.

[0067] In some embodiments, please refer to Figure 9 and Figure 13Each battery cubby 2 is provided with a grounding terminal 24, and the base structure 12 is also provided with grounding points 122, which are connected with the plurality of grounding terminals 24 respectively. In these embodiments, the grounding terminals 24 are 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 operating personnel, and the grounding points 122 are arranged on the base structure 12 of the battery rack 1 as part of the grounding system, connected with the grounding terminals 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 the plurality of grounding points 122 are connected with the plurality of grounding terminals 24 of the plurality of battery cubbies 2 one by one, which helps to disperse the grounding current, reduce the pressure of a single connection point, and improve the grounding continuity and reliability of the entire system, and also helps to maintain the equipotential of the electrical system, reduces the risk of electric shock caused by potential difference, and for example, the number of grounding points 122 is less than the number of battery cubbies 2 (grounding terminals 24), and through appropriate electrical connection, the remaining battery cubbies 2 share these grounding points 122 to form an effective grounding path, and the grounding capacity 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 the 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.

[0068] According to a second aspect of the present application, a battery energy storage system is provided, comprising a battery cluster 100, the structure of which is as described above. Since the battery energy storage system adopts all the technical solutions of the above-mentioned embodiments, it at least has the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0069] In the description of the present application, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0070] In the above-mentioned embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0071] The embodiments, implementation manners and related technical features of the present application can be combined or replaced with each other without conflict.

[0072] The above are only the preferred embodiments of the present application, and do not limit the present application in any form, but any simple modification, equivalent change and modification made to the above embodiments without departing from the technical solution of the present application and according to the technical essence of the present application are still within the scope of the technical solution of the present application.

Claims

1. A battery cluster, characterized in that: include: Battery rack; A plurality of battery plug-in boxes are provided on the battery rack, and the plurality of battery plug-in boxes are used to be connected to each other through high-voltage cables; a high-voltage box, provided on the battery rack and used to be connected to the plurality of battery plug-in boxes connected to each other via high-voltage cables; and The fire protection system is arranged on the battery rack.

2. The battery cluster according to claim 1, wherein: Each of the battery boxes is provided with a gas fire-fighting inlet; The fire-fighting system includes an enclosed gas fire-fighting device, which includes a fire-fighting gas cylinder and a fire-fighting gas pipe. The fire-fighting gas pipe is connected to the fire-fighting gas cylinder. The fire-fighting gas pipe is provided with multiple fire-fighting interfaces, and the multiple fire-fighting interfaces are respectively connected to the multiple gas fire-fighting inlets.

3. The battery cluster according to claim 2, characterized in that: The fire protection system further comprises an aerosol fire extinguishing device, which is located above the multiple battery boxes and the high-voltage box.

4. The battery cluster according to claim 3, characterized in that The fire protection system also includes a water sprinkler fire extinguishing device, which includes a fire hose and a sprinkler head. One end of the fire hose is used to connect to a fire water source, and the other end of the fire hose is connected to the sprinkler head. The sprinkler head is located above multiple battery boxes and the high-voltage box.

5. The battery cluster according to claim 1, wherein: Each of the battery boxes is provided with a liquid cooling inlet and a liquid cooling outlet; The battery cluster further includes a liquid cooling system, which includes: a liquid cooling pipe, the liquid cooling pipe comprising a primary water inlet pipe, multiple secondary water inlet pipes, multiple secondary water return pipes, and a primary water return pipe, one end of each of the multiple secondary water inlet pipes being connected to the primary water inlet pipe, the other ends of each of the multiple secondary water inlet pipes being connected to the multiple liquid cooling inlets, one end of each of the multiple secondary water return pipes being connected to the multiple liquid cooling outlets, and the other ends of each of the multiple secondary water return pipes being connected to the primary water return pipe; and; The liquid cooling unit is used to cool the coolant flowing out of the first-level return pipe and allow the cooled coolant to enter the first-level water inlet pipe.

6. The battery cluster according to claim 5, characterized in that The liquid cooling system further includes a water supply tank, which is connected to the first-level water inlet pipe and / or the first-level water return pipe through a valve.

7. The battery cluster according to any one of claims 1 to 6, characterized in that: The battery rack includes: The frame body is provided with an installation cavity, wherein the installation cavity accommodates a plurality of the battery plug-in boxes and the high-voltage box; and A foot structure is connected to the frame body, and the foot structure is provided with a mounting hole, and the mounting hole is used to pass a fastener so that the battery cluster can be detachably connected to the prefabricated cabin of the battery energy storage system.

8. The battery cluster according to claim 7, characterized in that: The battery rack further comprises: a plurality of first guide rail groups, each first guide rail group including two first mounting guide rails, the two first mounting guide rails being respectively provided on two opposite cavity walls of the mounting cavity, the two first mounting guide rails jointly supporting the corresponding battery plug-in box; and / or, The second guide rail group includes two second mounting guide rails, which are respectively arranged on two opposite cavity walls of the mounting cavity, and the two second mounting guide rails jointly support the high-voltage box.

9. The battery cluster according to claim 7, characterized in that: Each of the battery plug-in boxes is provided with a grounding terminal, and the base structure is further provided with a grounding point, which is respectively connected to a plurality of the grounding terminals.

10. A battery energy storage system, characterized in that: The battery cluster comprises the battery cluster according to any one of claims 1 to 9.

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