Energy storage system

Abstract

The utility model provides an energy storage system. The energy storage system comprises a cabinet body, a first cabinet door and a second cabinet door, the cabinet body comprises a first cabinet body and a second cabinet body which are adjacently arranged, the first cabinet door covers the side surface of the first cabinet body, and the second cabinet door covers the side surface of the second cabinet body; the first cabinet body comprises an energy management system, an auxiliary power distribution module, a battery management system and a multi-layer battery box unit; the energy management system is arranged close to the top end of the first cabinet body, and the auxiliary power distribution module is arranged adjacent to the energy management system; the battery management system is arranged between the auxiliary power distribution module and the battery box unit; each battery box unit is provided with a liquid cooling PACK; the second cabinet body comprises a converter and a liquid cooling unit, and the converter is arranged above the liquid cooling unit; and the liquid cooling unit is connected with each liquid cooling PACK through a liquid cooling pipeline. The device is simple in structure, low in installation cost and suitable for large-scale production.

Description

TECHNICAL FIELD

[0001] The utility model relates to energy storage system technical field especially relates to a kind of energy storage systems. BACKGROUND

[0002] With the rapid growth of global economy and the acceleration of urbanization process, the demand for energy of human beings also increases day by day. However, traditional fossil energy such as coal, oil and so on is decreasing, and its exploitation and use process will have serious impact on the environment, such as air pollution, greenhouse gas emission and climate change. In order to cope with these challenges, people urgently need to find alternative energy sources, and realize efficient use and sustainable development of energy.

[0003] Clean energy, including solar energy, wind energy and water energy, etc., is widely concerned due to its renewability and environmental protection. These energies not only can reduce the impact on the environment, but also have great development potential. However, the intermittency and instability of clean energy make it difficult to apply in practice. For example, solar and wind power generation are affected by weather conditions, and it is difficult to ensure continuous power supply. Therefore, how to store and dispatch these energies becomes a problem to be solved.

[0004] At present, compared with large-scale energy storage container, small outdoor cabinet system can not be limited by weight requirements of foreign transportation, and does not need to be integrated with conversion system after overall transportation to the ground. It can be directly connected to customer power grid and load equipment to start working. Outdoor cabinet system generally uses air-cooled energy storage, and the heat dissipation efficiency is slow. The heat dissipation efficiency in summer is affected by environmental temperature, and the temperature in the battery pack cannot be maintained at the most suitable temperature, so that the overall performance of the system is reduced, the temperature difference of the system is difficult to control, and circuit short circuit and fire are prone to occur. In addition, since the battery pack uses air-cooled heat dissipation, when the battery pack uses fire extinguishing agent for fire extinguishing, the fire extinguishing agent is difficult to stay in the battery pack for a long time for fire extinguishing and preventing secondary combustion. Moreover, air-cooled energy storage is prone to be affected by environmental dust, rainwater or mosquitoes for a long time, and there is a risk of short circuit. SUMMARY

[0005] Therefore, the utility model embodiment provides an energy storage system, which aims at solving the problems of low energy utilization efficiency, large energy loss, poor cooling effect, short service life of cabinet, unreliable fire extinguishing of energy storage system and potential safety hazards of existing energy storage system.

[0006] To achieve the above purpose, the utility model embodiment provides an energy storage system, which comprises a cabinet body, a first cabinet door and a second cabinet door. The cabinet body comprises a first cabinet body and a second cabinet body arranged adjacent to each other. The first cabinet door covers the side surface of the first cabinet body, and the second cabinet door covers the side surface of the second cabinet body.

[0007] The first cabinet comprises an energy management system, an auxiliary power distribution module, a battery management system and a plurality of battery box units; the energy management system is arranged near the top end of the first cabinet, the auxiliary power distribution module is arranged adjacent to the energy management system; the battery management system is arranged between the auxiliary power distribution module and the battery box units; the plurality of battery box units are arranged below the battery management system from top to bottom; each battery box unit is provided with a liquid-cooled PACK.

[0008] The second cabinet comprises a converter and a liquid-cooled unit, the converter is arranged above the liquid-cooled unit; the liquid-cooled unit is connected with each liquid-cooled PACK through a liquid-cooled pipeline.

[0009] As a preferred embodiment, the liquid-cooled pipeline comprises an inlet liquid main pipe, a plurality of inlet liquid branch pipes, an outlet liquid main pipe and a plurality of outlet liquid branch pipes; one end of the inlet liquid main pipe is connected with the liquid-cooled unit, the other end is connected with each outlet liquid branch pipe through a first connecting pipe, the outlet liquid branch pipe is connected with the liquid-cooled PACK; one end of the outlet liquid main pipe is connected with the liquid-cooled unit, the other end is connected with each inlet liquid branch pipe through a second connecting pipe, the inlet liquid branch pipe is connected with the liquid-cooled PACK.

[0010] As a preferred embodiment, the inlet liquid branch pipe is arranged one-to-one corresponding to the liquid-cooled PACK, one end of the inlet liquid branch pipe is in communication with the second connecting pipe, the other end is in communication with the inlet of the liquid-cooled PACK; the outlet liquid branch pipe is arranged one-to-one corresponding to the liquid-cooled PACK, one end of the outlet liquid branch pipe is in communication with the first connecting pipe, the other end is in communication with the outlet of the liquid-cooled PACK.

[0011] As a preferred embodiment, the first connecting pipe and the second connecting pipe are arranged on the side of the first cabinet near the second cabinet, and a gap is arranged between the first connecting pipe and the second connecting pipe.

[0012] As a preferred embodiment, the converter is arranged near the energy management system; the energy management system is connected with the battery management system, the converter and the auxiliary power distribution module respectively.

[0013] As a preferred embodiment, the auxiliary power distribution module is connected with the liquid-cooled unit and each battery box unit respectively; the auxiliary power distribution module is provided with a circuit breaker and a fuse.

[0014] As a preferred implementation, the liquid cooling unit comprises a cooling liquid pump, a heat exchanger and a cooling liquid storage tank; the liquid inlet main pipe and the liquid outlet main pipe are connected with the cooling liquid storage tank respectively; the cooling liquid pump is connected with the liquid inlet main pipe and the liquid outlet main pipe respectively; the heat exchanger is connected with the first connecting pipe and the liquid inlet main pipe respectively.

[0015] As a preferred implementation, the energy storage system further comprises a gas self-aided fire extinguisher; the gas self-aided fire extinguisher is provided with a temperature sensor; the gas self-aided fire extinguisher is connected with the battery management system; the battery management system is provided with a BMS high-voltage module.

[0016] As a preferred implementation, the gas self-aided fire extinguisher comprises a fire extinguishing agent storage tank, a gas fire-fighting pipeline, a cabin-level gas nozzle and a plurality of PACK-level gas nozzles; the PACK-level gas nozzles are arranged in the battery box unit, and the PACK-level gas nozzles are arranged one by one corresponding to the battery box unit; the cabin-level gas nozzle is arranged above the battery box unit; the fire extinguishing agent storage tank is connected with the cabin-level gas nozzle and each PACK-level gas nozzle through the gas fire-fighting pipeline.

[0017] As a preferred implementation, the energy storage system further comprises a water fire-fighting module arranged adjacent to the battery management system, the water fire-fighting module is arranged between the gas self-aided fire extinguisher and the battery management system, and the water fire-fighting module is arranged above the battery box unit; the water fire-fighting module is connected with an external water fire-fighting interface through a water fire-fighting pipeline.

[0018] As a preferred implementation, the top of the first cabinet body is provided with an explosion venting structure, and the explosion venting structure is arranged in communication with the first cabinet body.

[0019] As a preferred implementation, the first cabinet door is provided with a fire-fighting exhaust system at one end close to the liquid cooling unit; an EMS display screen is arranged above the fire-fighting exhaust system.

[0020] As a preferred implementation, the first cabinet door is further provided with a running state indicator light, an emergency stop button and a buzzer, the emergency stop button and the buzzer are arranged adjacent to each other, and the running state indicator light is arranged above the emergency stop button; the emergency stop button is arranged above the EMS display screen.

[0021] As a preferred implementation, the second cabinet door is provided with a plurality of exhaust grilles, and the plurality of exhaust grilles are arranged parallel to each other.

[0022] As a preferred implementation, the bottom of the cabinet body is provided with a forklift opening for convenient transportation and installation.

[0023] Compared with the prior art, the structure has the following technical effects: the liquid cooling unit is arranged in the cabinet, and the battery box unit is connected with the liquid cooling unit through the liquid cooling pipeline, so that the working temperature of the battery box unit can be effectively controlled, and the service life of the battery box unit is prolonged. The energy management system, the converter and the fire-fighting module are arranged in the cabinet, so that the cabinet can flexibly adjust the charging and discharging strategy of the battery according to the actual load demand, thereby effectively improving the energy utilization efficiency of the cabinet; meanwhile, the use safety of the cabinet can be effectively improved, and the accident risk can be reduced. The structure is simple, the connection is simple and clear, easy to realize, high in assembly efficiency and low in installation cost, effectively simplifies the traditional cabinet structure, effectively improves the expansibility and maintenance convenience of the cabinet, reduces the maintenance cost, and is suitable for large-scale production. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical schemes in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative labor.

[0025] Figure 1 is a front view structural schematic diagram of the energy storage system of an embodiment of the present application.

[0026] Figure 2 is Figure 1 a whole structure schematic diagram of the energy storage system.

[0027] Figure 3 is Figure 1 a fire-fighting principle structure schematic diagram of the energy storage system.

[0028] The implementation, functional characteristics and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0029] The technical schemes in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the present application.

[0030] It should be noted that if the embodiments of the utility model have directionality indication (such as up, down, left, right, front, back, top, bottom), the directionality indication is only used to explain the relative position relationship, movement condition and the like between components in a certain specific posture (as shown in the drawings), if the specific posture changes, then the directionality indication also changes accordingly.

[0031] In the utility model, unless another explicit provision and limitation, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the communication inside two elements or the interaction relationship of two elements, unless another explicit limitation. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0032] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on another element or there can be a middle element. When an element is referred to as "connected to" another element, it can be directly connected to another element or there can be a middle element.

[0033] In addition, if the embodiments of the utility model have the description of "first", "second" and the like, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one feature. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on that ordinary skilled in the art can realize, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and it is not within the protection scope required by the utility model.

[0034] Specifically, as shown in Figures 1 to 3 An embodiment of the utility model provides a kind of energy storage system, including cabinet 10, first cabinet door 20 and second cabinet door 30;The cabinet 10 includes first cabinet body 11 and second cabinet body 12 adjacently arranged, the first cabinet door 20 is covered on the side of the first cabinet body 11, the second cabinet door 30 is covered on the side of the second cabinet body 12;

[0035] The first cabinet 11 comprises an energy management system 40 (EMS), an auxiliary power distribution module 50, a battery management system (BMS) 60, and a plurality of battery box units 70; the energy management system 40 is arranged near the top end of the first cabinet 11, the auxiliary power distribution module 50 is arranged adjacent to the energy management system 40; the battery management system 60 is arranged between the auxiliary power distribution module 50 and the battery box unit 70; the plurality of battery box units 70 are arranged below the battery management system 60 from top to bottom; each battery box unit 70 is provided with a liquid-cooled PACK 71.

[0036] The second cabinet 12 comprises a converter 80 and a liquid-cooled unit 90, the converter 80 is arranged above the liquid-cooled unit 90; the liquid-cooled unit 90 is connected with each liquid-cooled PACK 71 through a liquid-cooled pipeline 100.

[0037] In the embodiment of the present application, the energy management system can realize intelligent and efficient scheduling of energy, reducing energy loss. As the control center of the system, the EMS monitors the system operation state in real time, optimizes the charging and discharging strategy, and adjusts the working mode of the battery pack. The EMS, BMS and converter exchange data through a communication bus (such as CAN or Modbus) to realize efficient collaboration of the overall system. The converter realizes efficient conversion of direct current and alternating current, has multiple protection functions (such as overvoltage, undervoltage, overcurrent, short circuit protection, etc.), to ensure the safe and stable operation of the system. The first cabinet 11 and the second cabinet 12 are integrally formed.

[0038] As a preferred embodiment, the liquid-cooled pipeline 100 comprises an inlet liquid main pipe 101, a plurality of inlet liquid branch pipes 102, an outlet liquid main pipe 103, and a plurality of outlet liquid branch pipes 104; one end of the inlet liquid main pipe 101 is connected with the liquid-cooled unit 90, the other end is connected with each outlet liquid branch pipe 104 through a first connecting pipe 110, the outlet liquid branch pipe 104 is connected with the liquid-cooled PACK 71; one end of the outlet liquid main pipe 103 is connected with the liquid-cooled unit 90, the other end is connected with each inlet liquid branch pipe 102 through a second connecting pipe 120, the inlet liquid branch pipe 102 is connected with the liquid-cooled PACK 71. The liquid-cooled pipeline uses liquid medium to cool and control the temperature of the energy storage equipment through pipeline circulation. By introducing coolant into the system, the heat generating elements and the coolant are heat exchanged, thereby effectively improving the energy conversion efficiency and maintaining the temperature stability of the system. Its working principle is that the liquid coolant circulates in the pipeline, absorbs the heat generated by the equipment when flowing through the equipment, and then is cooled by the cooler and circulated back to the equipment to form a closed loop system.

[0039] As a preferred embodiment, the liquid inlet branch pipes 102 are arranged one-to-one with the liquid-cooled PACK 71, one end of the liquid inlet branch pipe 102 is arranged in communication with the second connecting pipe 120, and the other end is arranged in communication with the liquid inlet of the liquid-cooled PACK 71; the liquid outlet branch pipe 104 is arranged one-to-one with the liquid-cooled PACK 71, one end of the liquid outlet branch pipe 104 is arranged in communication with the first connecting pipe 110, and the other end is arranged in communication with the liquid outlet of the liquid-cooled PACK 71.

[0040] As a preferred embodiment, the first connecting pipe 110 and the second connecting pipe 120 are arranged on the side of the first cabinet 11 close to the second cabinet 12, and a gap is arranged between the first connecting pipe 110 and the second connecting pipe 120.

[0041] As a preferred embodiment, the converter 80 is arranged close to the energy management system 40; the energy management system 40 is connected with the battery management system 60, the converter 80, and the auxiliary power distribution module 50, respectively.

[0042] As a preferred embodiment, the auxiliary power distribution module 50 is connected with the liquid-cooled unit 90 and each battery box unit 70, respectively; a circuit breaker (not labeled in the figure) and a fuse (not labeled in the figure) are arranged in the auxiliary power distribution module 50. The auxiliary power distribution module can distribute the power inside the system to ensure the normal operation of each subsystem (such as the liquid-cooled unit, gas fire extinguishing, water fire extinguishing, etc.); through the protection devices such as the circuit breaker and the fuse, the abnormal conditions such as overcurrent and short circuit of the system can be coped with.

[0043] As a preferred embodiment, the liquid-cooled unit 90 includes a cooling liquid pump (not labeled in the figure), a heat exchanger (not labeled in the figure), and a cooling liquid storage tank (not labeled in the figure); the liquid inlet main pipe and the liquid outlet main pipe 103 are connected with the cooling liquid storage tank, respectively; the cooling liquid pump is connected with the liquid inlet main pipe 101 and the liquid outlet main pipe 103, respectively; and the heat exchanger is connected with the first connecting pipe 110 and the liquid inlet main pipe 101, respectively. The liquid-cooled PACK cooperates with the liquid-cooled unit to adjust the flow rate and temperature of the cooling liquid through the temperature control strategy, realizes efficient thermal management of the battery through the circulation of the cooling liquid, avoids the performance degradation or safety hazards of the battery caused by excessively high temperature, and realizes precise thermal management.

[0044] As a preferred embodiment, the energy storage system further comprises a gas self- extinguishing device 130, wherein a temperature sensor (not shown in the figure) is arranged in the gas self- extinguishing device 130; the gas self- extinguishing device 130 is connected with the battery management system 60; and a BMS high-voltage module 61 is arranged in the battery management system 60. Through the BMS high-voltage module 61, functions such as electrical connection and distribution, battery protection, pre-charge, voltage and current monitoring, high-voltage interlocking, maintenance safety and quick power-off are realized, thereby ensuring the electrical safety and stable operation of the entire energy storage system.

[0045] As a preferred embodiment, the gas self- extinguishing device 130 comprises a fire extinguishing agent storage tank 131, a gas fire-fighting pipeline 132, a cabin-level gas nozzle 133 and a plurality of PACK-level gas nozzles 134; the PACK-level gas nozzles 134 are arranged in the battery box units 70, and the PACK-level gas nozzles 134 are arranged in one-to-one correspondence with the battery box units 70; the cabin-level gas nozzle 133 is arranged above the battery box units 70; and the fire extinguishing agent storage tank 131 is connected with the cabin-level gas nozzle 133 and each PACK-level gas nozzle 134 through the gas fire-fighting pipeline 132. The gas self- extinguishing device 130 can be used as an automatic fire extinguishing device for communication cabinets, battery compartments, power cabinets, industrial and commercial energy storage cabinets and the like. The gas self- extinguishing device 130 can be started by a temperature-sensitive element or triggered and started by a BMS (battery management system) or other fire control system electrical signal. The gas self- extinguishing device 130 uses an insulating and environmentally friendly perfluoroalkyl ketone fire extinguishing agent, which can effectively extinguish early-stage lithium battery fires caused by electrical fires and cell thermal runaway, and has the functions of rapid cooling and continuous suppression of rekindling.

[0046] In the embodiments of the present application, the energy storage system further comprises a smoke sensor 135, a cabin-level composite detector 136, a temperature sensor 137, a hot aerosol fire extinguishing device 138, a plurality of PACK-level composite detectors 139 and a fire control controller A; the smoke sensor 135 and the temperature sensor 137 are arranged at the top of the first cabinet body 11; the PACK-level composite detectors 139 are arranged in one-to-one correspondence with the battery box units 70; the fire control controller A is connected with each PACK-level composite detector 139 and the cabin-level composite detector 136; and the hot aerosol fire extinguishing device 138 is connected with each PACK-level composite detector 139 and the cabin-level composite detector 136.

[0047] As a preferred embodiment, the energy storage system further comprises a water fire extinguishing module 140 arranged adjacent to the battery management system 60, the water fire extinguishing module 140 is arranged between the gas self- extinguishing device 130 and the battery management system 60, and the water fire extinguishing module 140 is arranged above the battery box unit 70; the water fire extinguishing module 140 is connected with an external water fire extinguishing interface 150 through a water fire extinguishing pipeline 141. The water fire extinguishing module is mainly used for rapid response in emergency situations such as battery thermal runaway, and extinguishes the fire by water or other water-based extinguishing agents to protect the energy storage system from further damage by fire. In the case that other fire extinguishing methods cannot extinguish the fire, the water fire extinguishing module can ensure that all fire sources in the battery box are completely extinguished through full submersion water coverage, improving the fire extinguishing effect.

[0048] As a preferred embodiment, the top of the first cabinet body 11 is provided with a pressure relief structure 160, which is arranged in communication with the first cabinet body 11. When the internal pressure of the first cabinet exceeds the limit, the pressure relief structure 160 automatically bursts to release pressure, preventing the risk of explosion caused by overpressure of the first cabinet, and ensuring the safety of system operation.

[0049] As a preferred embodiment, the first cabinet door 20 is provided with a fire exhaust system 170 near one end of the liquid cooling unit 90; an EMS display screen 180 is arranged above the fire exhaust system 170. The EMS display screen 180 is the user interface of the energy management system (EMS), which is used for real-time monitoring, operation and management of the running state of the battery energy storage system. The EMS display screen provides visual data display and control functions, helping users to intuitively understand the performance and state of the system, and to make necessary operation adjustments to the system.

[0050] The fire exhaust system is a safety component in the energy storage system, mainly used for rapidly exhausting harmful gases, heat and smoke in the case of fire, overheating or other abnormal conditions, reducing the risk of fire spread, ensuring the overall safety of the system, and keeping the air quality and temperature inside the energy storage cabinet within a safe range.

[0051] As a preferred embodiment, the first cabinet door 20 is further provided with a running state indicator lamp 190, an emergency stop button 200 and a buzzer 210, the emergency stop button 200 and the buzzer 210 are arranged adjacent to each other, and the running state indicator lamp 190 is arranged above the emergency stop button 200; the emergency stop button 200 is arranged above the EMS display screen 180. Through the running state indicator lamp, the running state of the system (such as normal, warning, fault, etc.) can be displayed, so as to facilitate the timely discovery of problems. The emergency stop button is arranged outside the cabinet body, which facilitates quick power cut-off in emergency situations and ensures personal and equipment safety. The buzzer emits a buzzing sound when the combustible gas concentration inside the energy storage cabinet exceeds the standard or other safety alarm exceeds the limit, reminding the surrounding personnel to pay attention to safety.

[0052] As a preferred embodiment, the second cabinet door 30 is provided with a plurality of exhaust grilles 31, and the plurality of exhaust grilles 31 are arranged parallel to each other. Through the exhaust grilles, the internal heat can be effectively discharged while preventing rainwater and insects from entering.

[0053] As a preferred embodiment, the bottom of the cabinet body 10 is provided with a forklift opening (not labeled in the figure) for facilitating transportation and installation.

[0054] The fire-fighting working principle of the present application is as shown in the figure. Figure 3 The fire-fighting system of the present application has automatic fire detection and automatic start-up of fire extinguishing function, the battery box unit adopts a perfluorohexone fire extinguishing device to spray and release a cluster level, and the cabinet body adopts a thermal aerosol fire extinguishing device for protection.

[0055] a) When any of the smoke and temperature sensors alarms, the controller outputs a first level fire alarm signal, and the fire alarm dry contact signal is closed.

[0056] b) When the smoke and temperature sensors both alarm, the controller outputs a composite fire alarm signal, and the dry contact signal is closed.

[0057] c) When the composite sensor reports a first or second level warning, the controller uploads the warning signal to the EMS through CAN or 485, the abnormal situation can be confirmed by manual inspection of the site, and corresponding treatment can be performed according to the actual situation, and the dry contact signal is closed.

[0058] d) When the composite sensor reports a third level warning, the controller uploads the warning signal to the EMS through CAN or 485, and simultaneously starts the fire extinguishing agent spraying, the fire extinguishing agent is sprayed into each pack battery compartment through the pipeline and nozzle, and the pack level fire protection is implemented, and the dry contact signal is closed.

[0059] e) When the above fire-fighting measures cannot control the fire, the water fire-fighting port can be connected to the fire-fighting water immersion energy storage system.

[0060] The technical principles of the present application are as follows: In order to realize the efficient operation and safety guarantee of the above-mentioned system, the system design follows the following technical principles:

[0061] Thermal management principle: Liquid-cooled PACK and liquid-cooled unit realize real-time adjustment of battery temperature through cooling liquid circulation, avoiding battery overheating. The temperature control strategy dynamically adjusts the flow rate and temperature of the cooling liquid according to the working load of the battery and the environmental temperature, so as to keep the battery pack working within the optimal temperature range.

[0062] Energy management principle: EMS optimizes the charging and discharging strategy based on load demand, external grid state and SOC (state of charge) of the battery, etc. Through algorithm adjustment of the charging and discharging rate and timing of the battery, the energy utilization efficiency is maximized, and the power supply quality is stabilized when the load fluctuates.

[0063] Protection and safety principle: BMS monitors the running state of battery monomer in real time, through dynamic monitoring of parameters such as voltage and temperature, timely warning or triggering protection mechanism (such as equalization charging, active power-off, etc.), to prevent overcharge, overdischarge and other events that endanger the safety of the battery. The fire extinguishing system automatically starts the fire extinguishing device and notifies EMS for emergency treatment through the detection signals of smoke and temperature sensors.

[0064] Electric energy conversion principle: The converter uses PWM (pulse width modulation) technology to realize efficient DC / AC conversion, maintains the stability of output voltage and frequency through built-in control algorithm, and has multiple protection functions to ensure the safe operation of the system under various working conditions.

[0065] System linkage principle: Each subsystem interacts and works cooperatively through standardized interfaces and communication protocols (such as CAN, Modbus, etc.). EMS, as the control center, adjusts the system working mode in real time according to the battery state information provided by BMS and the operation data of the converter, ensuring the efficient and safe operation of the overall system.

[0066] Compared with the prior art, the present application has the following advantages:

[0067] (1) Efficient thermal management system

[0068] Application of liquid cooling technology: The use of liquid-cooled PACK and liquid-cooled unit through temperature control makes the battery work within the optimal temperature range, improving the charging and discharging efficiency and life of the battery, which is significantly superior to the existing air-cooled or natural cooling system.

[0069] (2) Integrated and modular design

[0070] Modular structure: The use of highly integrated and modular design facilitates the rapid installation, expansion and maintenance of the system, greatly reducing the construction time and cost of the system.

[0071] Convenient maintenance: Modular design makes components easier to replace and maintain, reducing downtime and improving system availability.

[0072] (3) Multiple security safeguards

[0073] Comprehensive safety protection mechanism: The system integrates BMS, EMS, fire protection system, and multiple safety measures such as overpressure, overcurrent, short circuit, and temperature anomalies, significantly improving system safety.

[0074] Explosion relief design: Innovative explosion relief structure design can effectively release internal pressure in extreme cases, preventing system explosion and ensuring equipment and operator safety.

[0075] (4) Intelligent management

[0076] Energy management system (EMS): Intelligent EMS can effectively optimize charging and discharging strategies, dynamically adjust battery operating modes, and improve system energy efficiency and response speed.

[0077] Precise monitoring and control: Combined with BMS and EMS, real-time monitoring of system status and remote control and management improve system intelligence.

[0078] (5) High compatibility and flexibility

[0079] AC / DC integrated design: The system supports multiple operating modes (grid-connected, off-grid, backup, etc.), can flexibly adapt to different application scenarios, and has strong adaptability and scalability.

[0080] High compatibility: Compatible with multiple battery types and energy storage converters, suitable for various energy storage needs and scene configurations.

[0081] (6) Energy efficiency optimization

[0082] Energy efficiency management: EMS optimizes battery charging and discharging strategies, improves system energy utilization, reduces energy loss, and has higher energy efficiency than traditional technologies.

[0083] Bidirectional converter technology: Efficient power conversion technology ensures high efficiency and stability during grid charging and discharging, reducing conversion loss.

[0084] (7) Fast response and stable power supply

[0085] Fast dynamic response: The system can quickly respond to changes in grid demand or load fluctuations, achieving stable power supply, especially in scenarios with frequent changes in new energy access and load.

[0086] High Reliability Power Supply: With multiple protection and backup design, the system can provide high reliability power supply, suitable for critical load and backup power supply scenarios.

[0087] (8) Strong environmental adaptability

[0088] Weather-resistant design: The energy storage cabinet body adopts high-strength materials, with good protection level, suitable for various harsh environments (high temperature, low temperature, humidity, dust, etc.), compared with existing technology, the environmental adaptability is stronger.

[0089] Anti-seismic design: In view of natural disasters such as earthquakes, the system has anti-seismic design, further improving the safety and adaptability.

[0090] (9) User-friendly interface

[0091] Friendly EMS display screen: Provide intuitive interface display and easy-to-operate control function, so that users can easily monitor and manage system operation, improve user experience.

[0092] Multi-language support and permission management: Support multi-language operation interface and multi-level permission management, convenient for global users and different operation level personnel to use and manage.

[0093] The energy storage system of the present application can better meet the efficient, safe and intelligent needs of modern energy storage applications through the improvement of heat management, integrated design, safety, intelligent management, compatibility, energy efficiency, response speed, environmental adaptability and user experience.

[0094] The above is only the preferred embodiment of the present application, not the limitation of the patent range of the present application, any equivalent structural transformation made by the content of the present application specification and drawings, or direct / indirect application in other related technical fields under the utility model concept of the present application are included in the patent protection range of the present application.

Claims

1. An energy storage system, characterized in that, It includes a cabinet body, a first cabinet door, and a second cabinet door; the cabinet body includes a first cabinet body and a second cabinet body arranged adjacent to each other, the first cabinet door covering the side of the first cabinet body, and the second cabinet door covering the side of the second cabinet body; The first cabinet includes an energy management system, an auxiliary power distribution module, a battery management system, and a multi-layer battery box unit; the energy management system is located near the top of the first cabinet, and the auxiliary power distribution module is located adjacent to the energy management system; the battery management system is located between the auxiliary power distribution module and the battery box unit; the multi-layer battery box unit is located below the battery management system from top to bottom; each battery box unit is equipped with a liquid-cooled PACK; The second cabinet includes a converter and a liquid cooling unit, with the converter positioned above the liquid cooling unit; the liquid cooling unit is connected to each of the liquid cooling PACKs via liquid cooling pipelines.

2. The energy storage system according to claim 1, characterized in that, The liquid cooling pipeline includes a main inlet pipe, several inlet branch pipes, a main outlet pipe, and several outlet branch pipes; one end of the main inlet pipe is connected to the liquid cooling unit, and the other end is connected to each of the outlet branch pipes through a first connecting pipe, and the outlet branch pipes are connected to the liquid cooling PACK; one end of the main outlet pipe is connected to the liquid cooling unit, and the other end is connected to each of the inlet branch pipes through a second connecting pipe, and the inlet branch pipes are connected to the liquid cooling PACK.

3. The energy storage system according to claim 2, characterized in that, The liquid inlet branch pipe is configured to correspond one-to-one with the liquid cooling PACK. One end of the liquid inlet branch pipe is connected to the second connecting pipe, and the other end is connected to the liquid inlet of the liquid cooling PACK. The liquid outlet branch pipe is configured to correspond one-to-one with the liquid cooling PACK. One end of the liquid outlet branch pipe is connected to the first connecting pipe, and the other end is connected to the liquid outlet of the liquid cooling PACK.

4. The energy storage system according to claim 2, characterized in that, Both the first connecting pipe and the second connecting pipe are located on the side of the first cabinet near the second cabinet, and a gap is provided between the first connecting pipe and the second connecting pipe.

5. The energy storage system according to claim 1, characterized in that, The converter is located close to the energy management system; the energy management system is connected to the battery management system, the converter, and the auxiliary power distribution module. The auxiliary power distribution module is connected to the liquid cooling unit and each of the battery box units respectively; the auxiliary power distribution module is equipped with a circuit breaker and a fuse.

6. The energy storage system according to claim 2, characterized in that, The liquid cooling unit includes a coolant pump, a heat exchanger, and a coolant storage tank; the inlet manifold and the outlet manifold are respectively connected to the coolant storage tank; the coolant pump is respectively connected to the inlet manifold and the outlet manifold; and the heat exchanger is respectively connected to the first connecting pipe and the inlet manifold.

7. The energy storage system according to claim 1, characterized in that, The energy storage system also includes a gas self-extinguishing fire extinguisher; the gas self-extinguishing fire extinguisher is equipped with a temperature sensor; the gas self-extinguishing fire extinguisher is connected to the battery management system; the battery management system is equipped with a BMS high-voltage module.

8. The energy storage system according to claim 7, characterized in that, The gas self-service fire extinguisher includes an extinguishing agent storage tank, a gas fire-fighting pipeline, a compartment-level gas nozzle, and multiple PACK-level gas nozzles. The PACK-level gas nozzles are located inside the battery box unit, and each PACK-level gas nozzle corresponds to one of the battery box units. The compartment-level gas nozzles are located above the battery box unit. The extinguishing agent storage tank is connected to the compartment-level gas nozzles and each PACK-level gas nozzle via the gas fire-fighting pipeline.

9. The energy storage system according to claim 7, characterized in that, The energy storage system also includes a water fire suppression module disposed adjacent to the battery management system. The water fire suppression module is located between the gas self-extinguishing fire extinguisher and the battery management system, and is positioned above the battery box unit. The water fire suppression module is connected to an external water fire suppression interface via a water fire suppression pipeline. The top of the first cabinet is provided with an explosion venting structure, which is connected to the first cabinet.

10. The energy storage system according to claim 1, characterized in that, A fire exhaust system is installed at the end of the first cabinet door near the liquid cooling unit; an EMS display screen is installed above the fire exhaust system. The first cabinet door is also equipped with a running status indicator light, an emergency stop button, and a buzzer. The emergency stop button and the buzzer are arranged adjacent to each other, and the running status indicator light is located above the emergency stop button. The emergency stop button is located above the EMS display screen. The second cabinet door is provided with multiple ventilation grilles, which are arranged parallel to each other; The bottom of the cabinet is equipped with a forklift opening for easy transport and installation.

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