This section describes the explosive power of 18650 lithium battery and ternary
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2023/05/11 10:57:01
18650 lithium battery is still the highest risk of explosion, but the explosion here, and the explosion is not a concept, insignificant damage, but after the explosion of combustion is very intense, release highly toxic gas, we should pay special attention to the use of safety.
The vast majority of 18650 lithium ion batteries use steel shell packaging, quality of the battery due to no protection function, in the case of overcharge (overcharge), will make its internal pressure surge, when more than the bearing value, it will explode. A battery explosion can be caused by a short circuit, excessive temperature, or a battery being squeezed out of shape or even punctured.
After all, lithium-ion battery is only a battery, not a bomb, even the worst safety of 18650 lithium, energy release is relatively slow, at most after the rupture of violent combustion, the so-called explosion, just a little movement when the rupture. The conclusion is that even if 23,000 lithium-ion batteries were stacked together, the explosion would be so limited that it would barely kill anyone. So in daily life, the use of 18650 lithium installed equipment must be careful.
The preparation technology of 18650 lithium ion battery has been very mature. Besides the performance has been greatly improved, its safety is also very perfect. To prevent the sealed metal casing from exploding, 18650 batteries now have a safety valve at the top, which is standard on every 18650 battery and the most important barrier to explosion. When the pressure inside the battery is too high, the safety valve on the top of the battery will be opened to reduce the exhaust pressure and prevent explosion.
How powerful is the explosion of ternary lithium ion battery?
Why did the Tesla crash? Superbatteries, known for their high energy density, are likely to be blamed. The higher the energy density of the battery, the more energy can be stored per unit volume and the longer the range of the vehicle. Ternary lithium ion battery, with 300Wh/kg battery energy density is the first in the world.
However, three-way lithium-ion batteries are far from safe. In a car accident, the external impact can damage the battery diaphragm, which can lead to a short circuit. The heat from the short circuit can cause the battery to lose thermal control and quickly raise the temperature above 300 ° C.
The thermal stability of ternary lithium ion battery is poor, adhere to less than 300℃ will decompose oxygen molecules, encounter the battery in the flammable electrolyte, carbon material after a point, the heat further aggravate the decomposition of the positive electrode, in a very short time will be combustible. In contrast, another widely used lithium ion iron phosphate battery can last to 700-800 ° C without breaking down oxygen molecules, making it far safer.
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