Submerged industrial and commercial liquid cooling energy storage fire extinguishing system

Abstract

The utility model discloses a submerged industrial and commercial liquid cooling energy storage fire extinguishing system, which is applied to the field of fire safety and aims to solve the problem that thermal runaway occurs in a single battery cell and then spreads to the whole module in the prior art; after the module is subjected to thermal runaway, the battery module is diffused to the adjacent battery module; and the caused loss is difficult to retrieve. According to the utility model, a multi-stage isolation design is added in the energy storage system, so that when thermal runaway occurs to the module, a fault part can be quickly turned off or isolated; when the battery cells are subjected to thermal runaway, the fire-fighting host controls the oil-based fire extinguishing device to open the control valve, and the battery cells in the liquid-cooled battery module are completely submerged in the novel oil-based fire extinguishing medium in a period of time; the battery cell is cooled and submerged in advance, so that the critical value of thermal runaway is not reached, and the system can normally operate after being recovered to normal.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of fire safety, especially relates to a commercial liquid cooling energy storage fire-fighting device. BACKGROUND

[0002] The fire-fighting medium and detection method of the existing industrial and commercial energy storage liquid cooling energy storage system commonly use gas detection, temperature sensing and smoke sensing. The fire-fighting medium is water, aerosol, heptafluoro-propane and perfluorohexone. When the battery catches fire due to thermal runaway, it cannot completely and effectively achieve the fire extinguishing effect. There is a great hidden danger to the safety of the entire system, causing serious personal injury and property loss.

[0003] With the development and application of new energy technology, battery energy storage technology is widely used in power systems, transportation, agriculture and other fields, becoming an important part of clean energy. Especially in industrial and commercial scenarios, the application of energy storage systems has become an important means to improve energy self-sufficiency, reduce enterprise electricity costs, and ensure the stability of power supply. However, the development and application of battery energy storage technology also face the challenge of safety problems. Once a safety accident occurs in the energy storage system, it will pose a serious threat to the surrounding environment and personal safety. Industrial and commercial energy storage directly faces application scenarios such as factories, hospitals, shopping malls and parks. Compared with traditional power station energy storage, the scene is more complex, the fire-fighting difficulty is greater, and the personnel and assets are more concentrated. Its demand for safety is particularly prominent. In view of the safety problem, the current industrial and commercial energy storage safety scheme is gradually being strengthened, but it is still difficult to accurately identify risks and protect equipment operation in the early stages of an accident. It also lacks the ability to protect the safety of surrounding persons and assets in extreme cases, and cannot completely guarantee the safety of equipment, assets and persons in industrial and commercial scenarios, and has defects and limitations.

[0004] The application of energy storage technology can generally be divided into power generation side, user side and power grid side. It is mainly used to realize self-generation, peak-valley price difference arbitrage, capacity demand electricity management and improve power supply reliability in cooperation with photovoltaic and other new energy systems on the user side. As an important use scenario of user-side energy storage, industrial and commercial scenarios have higher requirements for the safety performance of equipment compared to traditional energy storage power stations.

[0005] The failure path of industrial and commercial energy storage systems includes risk source introduction, thermal runaway occurrence, thermal runaway spread and extreme case energy storage fire and explosion. Each link corresponds to different safety technical challenges. How to achieve the following safety technical challenges and meet the protection of the entire failure process will become the key to safeguarding the safety of industrial and commercial energy storage system equipment, assets and personal safety.

[0006] The original safety of the energy storage system is directly related to the performance of the battery cell, and the battery itself is still the core of the safety of the energy storage system. In the normal charging and discharging reaction of the lithium battery, there are many potential exothermic side reactions, and the lithium battery is unstable. The energy storage system integrator needs to further improve the requirements of battery materials, battery selection and production process, and strengthen the safety of energy storage from the source.

[0007] The safety management of the failure link of the energy storage system can be roughly divided into early warning and fault and thermal runaway alarm two levels. When the failure link proceeds to the fault and thermal runaway alarm link, the reaction inside the energy storage has already formed, and the thermal runaway of the battery cell or module is irreversible. In the early warning stage, the thermal runaway can be warned in advance through the real-time monitoring of the battery cell data, intelligent prediction of the battery cell risk, and hierarchical warning of the fault, so as to give the intervention of the operation and rescue measures time and fundamentally block the thermal runaway risk.

[0008] The inducing factors of battery thermal runaway are complex, including non-battery risk, external and environmental risk, electrical risk, internal defect fault and control failure risk and other risk sources. They can cause overheating, short circuit and other problems during the operation of the energy storage equipment, thereby causing thermal runaway and fire.

[0009] The diffusion of thermal runaway in the energy storage system first occurs in a single battery cell, then spreads to the entire module, and then spreads to the adjacent battery module. Once the thermal runaway starts, it is difficult to stop, and the loss caused by it is difficult to recover. Practical new type content

[0010] The utility model discloses a kind of submerged industrial and commercial energy storage fire extinguishing systems, and the whole cabinet energy storage cabinet is electrically extinguished by aerosol fire extinguishing device;Each liquid-cooled battery module is immersed by setting immersed fire extinguishing system in liquid-cooled battery module.

[0011] The technical scheme adopted by the present application is as follows: a submerged industrial and commercial energy storage fire extinguishing system, comprising: an energy storage cabinet, a fire extinguishing host, the bottom of the energy storage cabinet is connected to the base by bolts, the inner cavity of the energy storage cabinet is riveted with a bracket, the inner part of the bracket is connected with a liquid-cooled battery module, an oil-based fire extinguishing device and a sensor system by bolts respectively, and the fire extinguishing host is connected with the liquid-cooled battery module, the oil-based fire extinguishing device and the sensor system.

[0012] The sensor system specifically includes sensors distributed inside each liquid-cooled battery module and sensors arranged on the top of the energy storage cabinet.

[0013] The beneficial effects of this utility model are as follows: The sensor system of this utility model is used to detect when the temperature, smoke, and combustible gas (CO, H2) inside the liquid-cooled module reach the alarm threshold, indicating that thermal runaway of the battery cell has occurred. The system then controls the oil-based fire extinguishing device via the fire alarm control panel to open the control valve, quickly submerging all the battery cells inside the liquid-cooled battery module in the new oil-based fire extinguishing medium. This achieves cooling of the battery cells and pre-submerges them to prevent them from reaching the critical value for thermal runaway, ensuring normal operation of the system after recovery. It enables rapid isolation of liquid-cooled battery modules in industrial and commercial liquid-cooled energy storage systems when thermal runaway occurs, preventing its spread. Furthermore, the method of completely submerging and cooling the battery cells does not affect their normal operation after recovery, thus reducing losses due to failure. Attached Figure Description

[0014] Figure 1 A schematic diagram of the energy storage cabinet provided by this utility model;

[0015] Figure 2 A schematic diagram of the oil-based fire extinguishing device provided by this utility model;

[0016] Figure 3 This is a structural diagram of the liquid-cooled battery module provided by this utility model;

[0017] Figure 4 A schematic diagram of the working principle of the industrial and commercial energy storage system provided by this utility model. Detailed Implementation

[0018] To facilitate understanding of the technical content of this utility model by those skilled in the art, the content of this utility model will be further explained below with reference to the accompanying drawings.

[0019] This utility model discloses a submerged industrial and commercial energy storage fire protection system, comprising: an energy storage cabinet and a fire control panel, such as... Figure 1 As shown, the bottom of the energy storage cabinet is connected to the base by bolts, and the inner cavity of the energy storage cabinet is riveted with a bracket. The inside of the bracket is connected to a liquid-cooled battery module, an oil-based fire extinguishing device, and a sensor system by bolts. The fire control panel is connected to the liquid-cooled battery module, the oil-based fire extinguishing device, and the sensor system.

[0020] like Figure 2 As shown, the sensing system specifically includes sensors distributed inside each liquid-cooled battery module for detecting the internal temperature, smoke, and combustible gas of each liquid-cooled battery module; it also includes sensors installed on the top of the energy storage cabinet for detecting the internal temperature, smoke, and combustible gas of the entire energy storage cabinet.

[0021] like Figure 2As shown, the oil-based fire extinguishing device stores oil-based fire extinguishing medium, is connected to the spray head inside each liquid-cooled battery module through a pipeline, and further comprises a spray head arranged at the top of the energy storage cabinet body; a fire starting valve is arranged at each spray head.

[0022] As shown in Figure 2 Each fire starting valve and each sensor are connected to the fire host through a CAN bus.

[0023] As shown in Figure 2 The fire host is further connected to an audible and visual alarm through a CAN bus, and the audible and visual alarm is arranged outside the energy storage cabinet body.

[0024] As shown in Figure 2 The fire host is further connected to a spraying start-stop button through a CAN bus.

[0025] The industrial and commercial energy storage liquid-cooled battery module in the embodiment can adopt a composite detector, and a combination of multiple different types of sensors is adopted, specifically including: a temperature sensor, a smoke sensor, and a gas sensor; the temperature sensor detects the temperature inside the liquid-cooled battery module or the entire energy storage cabinet body; the smoke sensor detects the smoke inside the liquid-cooled battery module or the entire energy storage cabinet body; and the gas sensor detects the flammable gas inside the liquid-cooled battery module or the entire energy storage cabinet body. When the temperature sensing, smoke sensing, and flammable gas (CO, H2) inside the liquid-cooled battery module reach the alarm threshold, it is determined that the battery cell has thermal runaway, the control valve of the oil-based fire extinguishing device is opened by the fire host to control the module-level fire extinguishing, and the battery cells inside the liquid-cooled battery module are completely immersed.

[0026] In particular, the temperature sensor can be implemented by using a thermocouple temperature sensor, an infrared temperature sensor, or the like.

[0027] When the temperature inside the liquid-cooled battery module exceeds the preset upper limit of the working temperature of the liquid-cooled battery module, the temperature sensor controls the liquid cooling system to work to cool the liquid-cooled battery module; when the temperature inside the liquid-cooled battery module is lower than the preset lower limit of the working temperature of the liquid-cooled battery module, the fire host controls the heating system to heat the battery cells of the liquid-cooled battery module.

[0028] As shown in Figure 3As shown, the structure of the liquid-cooled battery module of the utility model specifically includes lithium iron phosphate battery cell 14 encapsulated in the shell, aerogel 15 arranged for each battery cell, and module aluminum end plate 16, further includes first battery management system CAN communication interface 1, second battery management system CAN communication interface 3, pressure relief valve 2, manual maintenance switch 4, fire-fighting composite gas detector 5, power output negative electrode 6, power output positive electrode 7, first fire-fighting system CAN communication interface 8, second fire-fighting system CAN communication interface 11, fire-fighting drive signal interface 9, module fire-fighting valve 10, liquid-cooled module water inlet 12, liquid-cooled module water outlet 13 arranged on the shell.

[0029] Table 1 liquid-cooled battery module structure component description table

[0030] Serial number Description 1 / 3 Battery management system CAN communication interface 2 Pressure relief valve 4 Manual maintenance switch with fuse function 5 Fire-fighting composite gas detector 6 Power output negative electrode 7 Power output positive electrode 8 / 11 Fire-fighting system CAN communication interface 9 Fire-fighting drive signal interface 10 Module fire-fighting valve 12 Liquid cooling module water inlet 13 Liquid cooling module water outlet 14 Lithium iron phosphate battery cell 15 Aerogel 16 Module aluminum end plate

[0031] As Figure 4 shown, the working principle diagram of the commercial energy storage system of the utility model, the positive and negative poles of each liquid-cooled battery module are connected to the DC pre-charging circuit through the DC fuse, connected to the AC filter capacitor through the inverter unit, and then connected to the grid side.

[0032] Those skilled in the art will appreciate that the embodiments described herein are presented for the purpose of helping the reader to understand the principles of the utility model, and should be understood as the protection scope of the utility model is not limited to such specific statements and embodiments. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model should be included in the scope of claims of the utility model.

Claims

1. A submerged commercial energy storage fire suppression system characterized by, The utility model relates to a kind of energy storage cabinet and fire-fighting host, the bottom of the energy storage cabinet is connected with base by bolt, the inner chamber of the energy storage cabinet is riveted with support, the inside of the support is respectively connected with liquid-cooled battery module, oil-based fire extinguishing device, sensor system by bolt;Fire-fighting host is connected with liquid-cooled battery module, oil-based fire extinguishing device, sensor system respectively. The sensor system specifically includes sensors distributed in each liquid-cooled battery module and sensors arranged on the top of the energy storage cabinet. The oil-based fire extinguishing device is connected to the spray heads in each liquid-cooled battery module and the spray head arranged on the top of the energy storage cabinet through a pipeline.

2. A flood type commercial energy storage fire suppression system according to claim 1, wherein, Each fire-fighting start valve and each sensor are connected to the fire-fighting host through a CAN bus.

3. A flood type commercial energy storage fire suppression system according to claim 2, wherein, The fire-fighting host is also connected to an audible and visual alarm through a CAN bus.

4. A flood-type commercial energy storage fire suppression system according to claim 3, wherein, The utility model also includes a spray start-stop button connected to the fire-fighting host through a CAN bus.

5. A flood type commercial energy storage fire suppression system according to claim 4, wherein, The sensor uses a composite detector, including a temperature sensor, a smoke sensor and a gas sensor, for detecting temperature, smoke and flammable gas.

6. A flood-type commercial energy storage fire suppression system according to claim 5, wherein, The temperature sensor uses a thermocouple temperature sensor or an infrared temperature sensor.

7. A flood-type commercial energy storage fire suppression system according to claim 6, wherein, ​

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