What are the important reasons for the explosion of lithium batteries?

Long-term overcharge of the battery: In the state of long-term charging, overcharge and overcurrent will also cause high temperature and high pressure, which may cause hidden dangers. Lithium batteries may instantaneously discharge under special conditions of temperature, humidity, and poor contact, resulting in a large amount of current, spontaneous combustion or explosion. Battery short-circuit: When the mobile phone is in a high temperature state, or is subjected to impacts, metal friction, etc., it may cause the battery to short-circuit and explode. Charging causes the battery to explode: charging while playing with the phone, while playing and 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 easier to explode. The charger does not match the battery: Generally, mobile phones have original chargers. A charger of the wrong model is likely to cause a battery accident. Apple mobile phones only accept original chargers to charge, which greatly reduces the chance of battery explosion. Excessive temperature: Excessive temperature means that the internal heat of the battery has reached the limit. Prolonged charging, high-temperature irradiation, and baking can easily cause the battery's temperature to become too high. In southern my country, ordinary families use electric ovens in winter. Many people like to use their mobile phones while grilling on the electric oven. This is also very dangerous. Thermal runaway: The reason why lithium batteries are in danger of exploding is due to a process called thermal runaway in the reaction inside the battery. Thermal runaway is a positive energy feedback cycle: increased temperature will cause the system to heat up, and the system will heat up and increase the temperature, which in turn makes the system hotter. The above reasons such as short-circuit of the battery, high ambient temperature, frequent overcharging, unauthorized modification of the casing, etc., will cause thermal runaway of the lithium battery, which may eventually cause fire or explosion. But don’t worry too much, your electronic device is not a ticking time bomb. As long as it is used reasonably in normal times, the lithium battery will work safely and reliably. Whenever the power drops to 50%, you should charge it. Lithium ions have no memory effect, but too low a voltage can severely damage them. Types of explosion The types of explosion of the battery cell can be classified into three types: external short circuit, internal short circuit, and overcharge. The outside here refers to the outside of the battery cell, which contains short circuits caused by poor internal insulation design of the battery pack. When a short circuit occurs on the outside of the cell and the electronic components fail to cut off the circuit, high heat will appear inside the cell, which will cause part of the electrolyte to vaporize and expand the battery shell. When the internal temperature of the battery is as high as 135 degrees Celsius, a good quality diaphragm paper will close the pores, the electrochemical reaction will be terminated or almost terminated, the current will drop sharply, and the temperature will slowly drop, thus warning of an explosion. However, the sealing rate of the pores is too poor, or the pores are not closed at all. The temperature of the battery will continue to rise, more electrolyte will vaporize, and finally the battery shell will be broken, and the battery temperature will even be increased. The material burns and explodes. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What are the reasons for the explosion of lithium batteries?