It is now 2020. With the continuous rise of ternary lithium batteries, the technology of ternary lithium batteries is now constantly developing and progressing. Ternary materials with higher energy density are slowly replacing iron phosphate with better stability. lithium battery. Although the ternary material brings higher energy density to the ternary lithium battery, its stability has become a greater challenge. In an environment with excessive temperature, the battery will bulge, and in severe cases There will even be an explosion. Is the probability of a ternary lithium battery exploding high? Today we will take a look at the probability of a ternary lithium battery exploding.

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The probability of a ternary lithium battery exploding

The probability is quite high. When the battery is overcharged, the excessive release of lithium in the positive electrode will change the structure of the positive electrode, and too much lithium will easily be unable to be inserted into the negative electrode, and it will also easily cause lithium on the surface of the negative electrode, and when the voltage reaches Above 4.5V, the electrolyte will decompose to produce a large amount of gas. All of the above may cause an explosion. The symptom before the explosion is the heating and deformation of charging, and the undesirable consequences are short circuit, open circuit, and even explosion.

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Which is the most powerful explosion of a ternary lithium battery or an 18650 lithium battery?

After all, lithium battery is just a battery, not a bomb. Even though the safety of 18650 lithium battery is the worst, its discharge performance is slower. At most, it burns violently after bursting. The so-called “explosion” is just a little movement when it bursts. The final conclusion is that even if 2,000 to 3,000 lithium batteries are stacked together, the power of the explosion is still limited, and it will basically not be killed. Therefore, in daily life, you must be careful when using devices with 18650 lithium batteries.

The preparation process of lithium batteries has been very mature, in addition to greatly improved performance, its safety is also very perfect. In order to prevent explosion of the sealed metal casing, a safety valve is installed on the top of the 18650 battery. This is the standard configuration of each 18650 battery and the most important explosion-proof barrier. When the internal pressure of the battery is too high, the safety valve on the top of the battery opens the exhaust and pressure reduction function to prevent explosion.

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Deep discharge lithium-ion battery

However, ternary lithium batteries still have many problems in terms of safety. In a car accident, the impact of external force will damage the battery diaphragm and cause a short circuit. The heat released during the short circuit will cause the battery to generate heat and increase the battery temperature to over 300°C. The thermal stability of ternary lithium battery is poor, and oxygen molecules will be decomposed when it is held at less than 300℃. It will be a little after encountering the flammable electrolyte and carbon materials of the battery. The heat generated further aggravates the decomposition of the positive electrode. In a very short time It will burn inside. In comparison, another widely used lithium iron phosphate battery can be kept at 700-800°C without decomposing oxygen molecules and is safer.

For more details How to increase lithium polymer battery life please check our later articles.