Lithium battery energy storage unit fire extinguishing system capable of realizing echelon early warning and multiple accurate spraying

Abstract

The invention discloses a lithium battery energy storage unit fire extinguishing system capable of realizing echelon early warning and multiple accurate spraying. The lithium battery energy storage unit fire extinguishing system comprises a power management system, an early warning control system and a first extinguishing device, wherein the early warning control system is connected with the powermanagement system; the fire extinguishing device is connected with the early warning control system; the fire extinguishing device is externally connected with a temperature sensing fire detection pipe, a large-flow release pipeline and a local release pipeline; and the early warning control system is externally connected with a local data summarization module and a lithium battery energy storagepack. The fire extinguishing system is set to perform cyclic detection according to a fire signal and can repeatedly send a starting signal to realize multiple starting, so that the lithium battery fire is restrained for a long time, and the after-combustion problem is solved; the fire risk can be early warned in advance, the early warning response speed is increased, and fire can be controlled in the initial stage to realize inhibition; and accurate detection and accurate fire extinguishing are achieved, and the fire extinguishing efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of fire extinguishing devices, in particular to a fire protection system for cascaded early warning and multiple times of precise discharge of lithium battery energy storage units. Background technique [0002] In recent years, as lithium batteries have many advantages such as high energy density, high output power, and long charge and discharge life, they have been widely used in the fields of transportation power, electric energy storage, and mobile communications, and have developed into my country's energy strategic. part of the emerging industry. However, with the in-depth application of lithium batteries in engineering, the problem of fire safety has become increasingly prominent. Since lithium batteries are energetic substances, especially when they are overheated, short-circuited, squeezed, etc., they will generate a lot of heat, causing fire hazards. The chain reaction of internal electrode material...

AI Technical Summary

Problems solved by technology

However, with the in-depth application of lithium batteries in engineering, the problem of fire safety has become increasingly prominent. Since lithium batteries are energetic substances, especially when they are overheated, short-circuited, squeezed, etc., they will generate a lot of heat, causing fire hazards. The chain reaction of internal electrode materials and electrolyte, and then thermal runaway occurs and develops into large-scale fire and explosion accidents

[0003] At present, in order to improve energy utilization density, more energy storage is installed in a relatively small space, and the space has been squeezed to the point where fire safety cannot be ensured. For example, a 40-foot energy storage container is equipped with a battery capacity of 2MWh, and the cells in the pack are tightly packed. Arrangement, once thermal runaway occurs, it is very easy to cause chain fire spread and explosion

Traditional fire warning cannot detect the thermal runaway of lithium batteries in time. When the fire is confirmed by temperature and smoke, it has often spread in a large area. Coupled with traditional fire release technology, the fire extinguishing agent cannot bypass the battery rack and battery immediately. The pack and module enter the vicinity of the thermally runaway cell to extinguish the fire, and the biggest problem with the thermal runaway of the lithium battery is that it will continue to generate heat, which can easily cause re-ignition. The traditional release technology releases the area evenly in the entire space, and then When the fire extinguishing agent sinks under the action of gravity, it is difficult to maintain a high inhibitory concentration for a long period of time near the thermal runaway battery, and it is impossible to fully and accurately utilize the limited fire extinguishing agent resources

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