Because of a number of lithium-ion batteries caused by fire and explosion, so lithium-ion batteries are not fully accepted by consumers, although the vast majority of the time lithium batteries in a very stable state, then why lithium-ion batteries will explode? the following points for your reference, I hope to solve the confusion.
First, the negative electrode of the lithium-ion battery capacity is insufficient
When the negative part of the positive part of the lithium-ion battery capacity is insufficient, the lithium atoms that appear when charging can not be inserted into the interlayer structure of the negative graphite, will precipitate on the surface of the negative electrode, the formation of crystals.
Long-term formation of crystals in lithium-ion batteries can lead to short circuits, when the cell is discharged sharply, there will be a lot of heat and burn the diaphragm. High temperature will make the electrolyte decomposition into gas, when the pressure is too high, the cell will explode.
Second, the water content is too high
When charging, water can react with lithium to generate lithium oxide, so that the capacity of the core loss, easy to make the core overcharge and generate gas, the decomposition of water voltage is low, easy to decompose and generate gas when charging, when this series of generated gas will make the internal pressure of the core increase, when the shell of the core can not bear, the core will explode.
Third, the internal short circuit
Internal short circuit of the core causes high current discharge, there is a lot of heat, burn the diaphragm, and cause a larger short circuit phenomenon, will make the electrolyte decomposition into gas, the internal pressure is too high, the cell will explode.
Fourth, lithium-ion battery overcharge
When the cell is overcharged, excessive release of lithium from the positive electrode will make the structure of the positive electrode changes, and too much lithium release is also easy to insert into the negative electrode, but also easy to cause the negative electrode surface lithium precipitation, and, when the voltage reaches 4.5V or more, the electrolyte will decompose to produce a large amount of gas. All of the above may cause an explosion.
V. External short circuit
External short circuit may be caused by the wrong positive and negative electrode connection, due to external short circuit, the battery discharge current is very high, will make the heat of the cell, high temperature will make the cell internal diaphragm shrinkage or completely bad, resulting in internal short circuit, and thus the explosion.
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