At present, lithium batteries are widely used in electronics, communications, medical care and other products, and play an important role in new energy storage, aerospace, electric bicycles, power tools and military. Because lithium battery is a kind of secondary rechargeable battery, and has the advantages of small size, easy portability, high energy storage capacity, long service life, low self-discharge rate, etc., it has gradually become the mainstream of current battery products.

The reasons for the explosion of lithium batteries are as follows:

1. Long-term overcharge of the battery: In the long-term charging state, overcharge and overcurrent will also lead to high temperature and high pressure, causing hidden dangers. Lithium batteries may be instantaneously discharged under special temperature, humidity and poor contact conditions to generate a large amount of current, causing spontaneous combustion or explosion.

2. Battery short circuit: When the mobile phone is in a high temperature state, or is subjected to impact, metal friction, etc., it may cause a battery short circuit and explode.

3. Charging causes the battery to explode: Playing with the phone while charging will cause the charging time to become longer, and charging for a long time will cause the temperature of the phone to rise, making it more likely to explode.

4. The charger does not match the battery: Generally, the mobile phone has the original charger. The wrong type of charger can easily cause battery accidents. Apple phones only accept original chargers for charging, which greatly reduces the chance of battery self-explosion.

5. Excessive temperature: Excessive temperature means that the internal heat of the battery has reached the limit. Long-term charging, high temperature irradiation, and baking will easily cause the battery temperature to be too high. In southern my country, most families use electric ovens in winter. Many people like to play with mobile phones on the side of the electric oven. This is also very dangerous, and it is easy to induce battery explosion.

6. Thermal runaway: The reason why lithium-ion batteries are at risk of explosion is due to a process called "thermal runaway" in the reaction inside the battery. "Thermal runaway" is an energy-positive feedback loop process: increased temperature causes the system to heat up, which in turn makes the system hotter. The above reasons, such as battery short circuit, high ambient temperature, frequent overcharging, unauthorized modification of the casing, etc., will cause thermal runaway of lithium-ion batteries, which may eventually cause fire or explosion.