Electric vehicle lithium-ion battery, why is it easier to fire than lead-acid batteries?

2022/04/08

  Author :Iflowpower – Portable Power Station Supplier

The battery of the two-wheeled electric car is essential to 2 categories, one is a lithium-ion battery, and one is a lead-acid battery. But the news reports that the battery is buffered or a lithium-ion battery. Then, the electric car lithium-ion battery is more likely to fire more likely to the lead-acid battery? The electrolytic liquid medium of the lithium-ion battery and the lead-acid battery is different.

The lead-acid battery is generally used as an electrolyte with sulfuric acid, and the sulfuric acid is not easily ignited, and the resistance of high temperature is good. And the electrolyte of the lithium-ion battery is used in organic matter, and lithium ion organic matter belongs to flammability. What is the lithium-ion battery will fire? Lithium-ion batteries are squeezed, puncture, and high temperature can cause SEI membrane (diaphragm) crushing.

The use of the SEI film is to ensure that the lithium ions are safely safe from the first level to the other level. If the lithium-ion battery SEi is accidentally broken, the lithium electron will instantly release huge heat, and finally "crushed" batteries. The light is not enough, and the lithium-ion battery will also release a lot of oxygen when burning.

We all understand the two must-have conditions: combustible materials, and oxygen gas has it, so the lithium-ion battery will be "more burn" after the fire, and the general dry powder fire extinguisher cannot be destroyed. Fire with a lot of water. The lead-acid battery will also catch fire, but the possibility of exploding.

The lead-acid battery due to the electrolyte is sulfuric acid, the plate is lead. These are relatively stable substances, but don't forget that in addition to the sulfuric acid electrolyte, there is water inside the lead-acid battery. Once the internal short circuit is short-circuited, the hydropower is hydrogen and oxygen.

These two gases are flammable gas, especially After the hydrogen is over, it will explode in the open fire! However, today's general use is a colloidal battery, the internal moisture content is small, and the concentration of hydrogen and oxygen is lowered by electrolysis, so it is not easy to happen the risk of fire explosion. Therefore, the lithium-ion battery is much higher than that of its lively chemical properties, the risk of fire is much higher than lead-acid batteries, which is why there are many safety conditions, which are used in lead-acid batteries. Old iron, how do you see?.

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