At present, all types of consumer electronics, mobile power supplies, and new energy vehicles represented by mobile phones use lithium battery devices. Lithium battery is the direction of new energy development in the future. Recently, some electronics factories have caught fires and explosions. The safety of lithium batteries has become the most concerned issue of consumers.
The following are the top five causes of fire in lithium batteries:
The external short circuit may be caused by improper operation or misuse. Due to the external short circuit, the battery discharge current is large, which will cause the battery core to heat up. The high temperature will cause the internal diaphragm of the battery core to shrink or completely break down, resulting in an internal short circuit and fire.
Due to the internal short-circuit phenomenon, the large current discharge of the battery cell generates a lot of heat, which burns the diaphragm and causes a greater short-circuit phenomenon. In this way, the battery core will generate high temperature and decompose the electrolyte into gas, causing excessive internal pressure. When the shell of the battery cell cannot withstand this pressure, the battery cell will catch fire.
When the battery is overcharged, the excessive release of lithium in the positive electrode will change the structure of the positive electrode. If too much lithium is released, it is easy to be unable to be inserted into the negative electrode, and it is also easy to cause lithium deposition on the surface of the negative electrode. Moreover, 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 a fire.
Moisture can react with the electrolyte in the battery cell to produce gas. When charging, it can react with the generated lithium to generate lithium oxide, which causes the capacity of the battery cell to be lost. It is easy to overcharge the battery to generate gas and decompose the water. The voltage is low, and it is easy to decompose and generate gas when charging. When this series of generated gas will increase the internal pressure of the battery, when the outer shell of the battery cannot withstand it, the battery will explode.
When the capacity of the negative electrode opposite to the positive electrode is insufficient, or there is no capacity at all, part or all of the lithium produced during charging cannot be inserted into the interlayer structure of the negative electrode graphite and will precipitate on the surface of the negative electrode, forming protruding “branches”. “Dendrite” will be more likely to cause the precipitation of lithium during the next charge. After tens to hundreds of cycles of charging and discharging, the “dendrites” will grow up, and will eventually pierce the diaphragm paper, causing internal short circuits.
1. Don’t try to modify the battery
2. Don’t overcharge or over-discharge during charging.
3. Use the original charger.
4. Use reliable batteries( Like us, HLC battery)
5. Do not put the battery in extreme environments. (Except for some special batteries). High-temperature and collisions are all important causes of a battery explosion. Try to keep the battery in a stable environment away from high-temperature places.
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