I. Critical Temperature for Lithium Battery Self-ignition
Lithium batteries are like small furnaces that are sensitive to heat. When the ambient temperature exceeds 60℃, the electrolyte inside begins to become restless. The heat resistance of different chemical systems in lithium batteries varies:
Lithium Iron Phosphate Battery: relatively mild, thermal runaway will occur only at about 200℃
Lithium Polymer Battery: more delicate, it may start to self-ignite at 130-150℃
Lithium Cobalt Oxide Battery: the most sensitive, there is a risk at around 100℃
II. Scenarios Prone to Risks
These situations in daily life are like adding fuel to the fire for lithium batteries:
Exposed cars: The temperature inside the car can reach 70℃ in summer
Overcharge protection failure: Continuous charging leads to accumulation of internal temperature
Physical damage: Direct short circuit after puncture
Low-quality chargers: Instability in current causes local overheating
III. Correct Ways to Cool Down Lithium Batteries
To keep lithium batteries calm, remember the three golden rules:
Avoid continuous use in high-temperature environments
Keep away from flammable materials when charging
Stop using immediately if a bulge is detected
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