The main causes of most lithium battery fires can be summarized as follows:
Internal Short Circuit:
Mainly due to the abuse of batteries, such as overcharging and over-discharging caused by crystals, impurities and dust in the battery production process, etc., these factors may deteriorate and form puncture separators, resulting in micro-short circuits.
The release of electrical energy leads to a temperature rise, and the chemical reaction of the material brought about by the temperature rise expands the short-circuit path, forming a larger short-circuit current.
This accumulation, mutual reinforcement of the destruction can eventually lead to thermal runaway, which can lead to fire.
External Short Circuit
Extended external shorts typically cause weak connection points in the circuit to burn out, but this rarely leads directly to a thermal runaway event in the battery.
External High Temperature
The structure of lithium batteries is such that a large amount of heat is generated due to multiple reactions in a high-temperature environment.
High temperatures can cause the diaphragm to melt, which can cause an internal short circuit, and the release of electrical energy increases heat generation.
The consequence of this cumulative, mutually reinforcing destructive effect is the ejection of electrolyte and the occurrence of combustion and fire.
Overcharge/Overdischarge
If the battery is overcharged while charging, or over-discharged during use, the internal structure of the battery may be damaged, resulting in leakage, explosion, etc.
Exposure to fire or high temperatures:
If a lithium battery is exposed to an open flame or a high-temperature environment, the electrolyte may expand and generate heat and gas, which can cause the battery to explode.
Leaving it for too long:
If the lithium battery is not used for a long time, it will cause the battery voltage to be too low, which can cause the battery to be damaged or explode.
In actual use, in order to avoid lithium battery fire, it is recommended that users take the following measures:
Choose a regular brand of lithium battery and operate it correctly according to the instructions.
Avoid leaving the battery in a high temperature environment for long periods of time, especially when charging and using it.
Avoid overcharging and overdischarging, and use appropriate chargers and discharging equipment.
If you find that there are abnormal phenomena in the lithium battery, such as heating, deformation, leakage, etc., you should stop using it immediately and seek professional help.
The above content is for reference only, for more information, it is recommended to consult experts in the field of battery safety or consult relevant literature.