The essence of a lithium battery fire is that the heat in the battery cannot be released according to the design intention, causing the combustible materials inside and outside to ignite , then causing a fire. The main reasons are external short circuits, high external temperatures and internal short circuits. Here are the specific reasons why lithium batteries are prone to fire:
1. Internal short circuit: due to battery abuse, such as dendrites caused by overcharging and overdischarging, impurity dust in the battery production process, etc. . This will deteriorate to the point of piercing the diaphragm and causing a micro short circuit. The release of electrical energy will cause the temperature to increase, and the chemical reaction of the material caused by the temperature increase will widen the short-c path.ircuit and will generate a larger short circuit current. The mutual accumulation and reinforcement of this damage can lead to thermal runaway, which is why the inside of the battery must be repaired.
2. External Short Circuit: A long-term external short circuit will usually burn out weak connection points in the circuit and will rarely result in thermal runaway of the battery. It is necessary to replace the circuit connections.
3. High external temperature: Due to the structural characteristics of lithium batteries, various reactions generate a large amount of heat. The diaphragm melts, causing an internal short circuit, and the release of electrical energy increases heat production. Due to this mutually reinforcing, cumulative destructive effect, electrolyte is ejected, burns, and ignites, necessitating replacement of the diaphragm.
When using batterieslithium battery, do not break or puncture the battery, as this will damage the diaphragm. When charging, the current and voltage should not exceed the specified values, otherwise the lithium battery may catch fire. When charging mobile phones and pure electric vehicles, it is recommended to use original chargers.
Major automakers are constantly looking for ways to improve the safety of ternary lithium batteries. If used correctly, ternary lithium batteries remain very safe.
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