This section describes the explosive power of 18650 lithium battery and ternary
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2023/09/18 16:03:28
18650 lithium is still the highest risk of explosion battery, but the explosion here, and the explosion is not a concept, the lethality is insignificant, but the combustion after the explosion is very intense, the release of highly toxic gas, pay special attention to the use of safety.
18650 lithium-ion battery The vast majority of the use of steel shell package, the quality of the battery because there is no protection function, in the case of overcharge (overcharge), it will make its internal pressure increase, when the withstand value is exceeded, it will explode. Problems such as short circuit, high temperature or the battery being squeezed and deformed or even punctured may cause the battery to explode.
Lithium-ion battery, after all, is only a battery, not a bomb, even the worst safety of 18650 lithium, the energy is relatively slow, at most after the rupture of violent combustion, the so-called explosion, just a bit of movement when the rupture. The conclusion is that even if 23,000 lithium-ion batteries are stacked together, the explosive power is very limited, and almost no one can blow up. Therefore, in daily life, the use of equipment installed with 18650 lithium battery must be careful.
18650 lithium-ion battery preparation process has been very mature, in addition to the performance has been greatly improved, its safety is also very perfect. In order to prevent the explosion of the sealed metal housing, the 18650 battery is now equipped with a safety valve at the top, which is the standard of every 18650 battery and is the most important explosion-proof barrier. When the internal pressure of the battery is too large, the top safety valve will open the exhaust pressure to prevent explosion.
How big is the explosive power 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 battery energy density, the more electricity is stored per unit volume, and the longer the vehicle's driving range. Ternary lithium-ion battery, with 300Wh/kg battery energy density is unique in the world.
However, ternary lithium-ion batteries are far from reliable in terms of safety. In a car accident, the external impact will damage the battery diaphragm, which will lead to a short circuit, and the heat emitted during the short circuit will cause the battery to lose control of heat, and quickly increase the temperature to more than 300 ° C.
Ternary lithium-ion battery thermal stability is poor, adhere to less than 300 ° C will decompose oxygen molecules, encounter the battery in the flammable electrolyte, carbon material after a point, the heat to further aggravate the decomposition of the positive electrode, in a very short time will deignite. In contrast, another widely used lithium ion iron phosphate battery can hold up to 700-800 ° C, and does not break down oxygen molecules, which is much safer.
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