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Author ：Iflowpower – Portable Power Station Supplier
Compared with the lead-acid battery, the lithium ion battery is more likely to explode a fire accident, and it is necessary to differ depending on the electrolyte of both. The electrolyte of the lead-acid battery is generally aqueous solution, which is not easy to start; and the electrolytic solution in the lithium ion battery is organic, we can understand it as gasoline, belong to flammable. Then, why the lead-acid battery can use aqueous solution, the lithium-ion battery is used as an electrolyte with relatively dangerous organic matter? Simply, because the highest ionization voltage of the two is different.
The highest ionization voltage of the aqueous solution is 2V, and this ionization voltage is far less than the lithium-ion battery. In order to increase the electrical energy density, the lithium ion battery does not use organic matter as an electrolyte. When the organic electrolyte is sealed in a narrow space such as the battery, there will be a higher explosion and the risk of fire.
The negative SEI film (ie, solid electrolyte membrane) is destroyed, one of the most important reasons. As the lead-acid battery, the lithium ion battery is also divided into positive and negative electrodes, and the positive electrode is generally lithium transition metal oxide, and the negative electrode is graphite and carbon. When the SEI film of the negative surface is destroyed, the compound of the carbon and lithium that occur during charging cannot be normal in place, and huge heat can occur inside the battery.
When the temperature rises, the positive electrode of the lithium-ion battery will automatically analyze the increase in oxygen when the temperature is increased. When there is flammable, there is a three major combustion conditions of oxygen, and the probability of explosion is sharply rising sharply. Because the positive electrode of the lithium-ion battery will automatically release oxygen when the temperature is increased, so we can't use the oxygen method to fire extinguish, that is, the dry powder fire extinguisher can not be used.
Therefore, the lithium-ion battery is very dangerous. So how do we handle the safety of lithium-ion batteries? This is a systematic engineering, starting from the design of the battery, to the protective board of the battery, and then to charging, ring ring. So users who bought a lithium-ion battery vehicle must be used in accordance with the procedures, and some charging issues are prohibited in the alert manual, and it is proposed to carry out the safety inspection of a battery one year.
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