What if lithium batteries catch fire? How do you avoid spontaneous combustion after charging?

Domestic famous lithium batteryexperts, Li Shujun, analyzed the battery spontaneous combustion phenomenon in order to find the culprit cause fire.Li Shujun said, the possibility of internal short circuit caused spontaneous combustion explosion.Li Shujun also pointed out that the country has not yet been aimed at lithium ion batteries production process and technical supervision standards at present , resulting in industry a mess.

Inside the battery short circuit more likely

Li Shujun is graduation of high energy physics, Chinese academy of sciences institute of physics, Ph.D., is the domestic earlier in one of the lithium ion battery technology development personnel.Li Shujun apart a lithium battery inside the pool, I saw a layer of aluminum foil and copper foil, there is a similar to the plastic layer of the diaphragm.Li Shujun, explains the process of lithium ion batteries, are of negative pole piece stack together, join the diaphragm strictly separated, among close winding together again, in the processed in advance shell, injection liquid electrolyte, and the opening seal, a lithium-ion battery is ready.Battery itself is no electricity at this moment, only the diaphragm material and electrolyte is flammable, but it is not flammable, it is very safe.Also does not have the high risk in the manufacturing process of the whole process, no special factors in blaze.

But the battery charge for the first time in before they leave, put aside and for testing, if there is a short circuit condition after charging, the result will be a spontaneous combustion phenomenon."Short circuit internal short circuit and external short circuit two kinds, the cause of the external short circuit may be caused in the process of storage, transportation and so on, and internal short circuit is the problem of the product itself", Li Shujun further explained, these problems include: in the process of production, the environment clean, lead to negative on a chip with other substances;Internal diaphragm cannot effectively separated is negative, was flawed.This will lead to storage in the battery power will quickly through the join point release, instantaneous release large amounts of heat, the battery temperature rise sharply, led first to the electrolyte, the diaphragm, such as fuel burning, after waiting for temperature rise to a certain degree, anode material and aluminum foil is also intense burning, center temperature rises to more than 1000 degrees Celsius, and similar explosion phenomenon.If inside the factory, a lot of batteries are centralized, can lead to a chain of fire explosion.

Lithium battery is on fire with dry powder can't fire

Li Shujun said, due to the battery internal combustion explosion, this time with dry powder fire extinguishers can't work, and is the best way to water to cool.

Lithium battery manufacturing lack of standards

In recent years, the batteries more and more spontaneous combustion and explosion accident, Li Shujun said, in the end or to enterprise production standard of blank in our country, lead to the chaos in the industry."External short circuit or consumer use undeserved rare, improper internal storage and transportation in the factory also relatively easy to avoid.For battery enterprise, the biggest danger lies in the fact that lead to internal short circuit manufacturing defects ", Li Shujun said that in order to avoid this kind of defect, battery manufacturing enterprises need to have good precision of processing equipment, and under the environment of low humidity and low dust production, and in each working procedure complete monitoring and testing.

At the same time, in order to avoid spontaneous result in fire, after charging the battery is not charged battery factory deposit must be independent within the fire compartment, and equipped with automatic monitoring facilities and smoke and spray fire extinguishing system, at the same time, the operator must leave a safe distance, near escape routes should be unobstructed."But with the stronghold machine, charging treasure low-end unregulated markets such as the existence of, a lot of investment is very small battery factory, processing and manufacturing lithium ion battery using simple equipment, lack of the most basic quality control measures, many products within the various defects and defects, the hidden danger of fire explosion is great.Piles up at will at the same time after charging the battery and adjacent cargo, there is no fire safety measures, fire accidents and casualties "extremely easily.

Investigate its reason, lies in the country at present in view of the lithium-ion battery production process and technical supervision standards.

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