In the industry, for different safety issues, lithium-ion batteries will use different safety technologies, such as thermal fuses and thermistors can be used to prevent overheating caused by short circuits.
In terms of preventing battery explosion, the most traditional solution is to add a safety valve. When the internal pressure of the battery is too large, the gas can escape through the safety valve, thereby preventing the explosion.
A similar approach is to make the battery casing thin, which may sound a bit weird. The thinner the battery casing, the easier it is to crack? But in fact, it is precisely because the thin and light battery casing can withstand less pressure, so it can be in the battery When thermal runaway occurs, but the pressure has not reached a particularly dangerous level, it will split in time, which is equivalent to the formation of a safety valve.
In addition, flame-resistant electrolytes are used. The electrolytes used in lithium-ion batteries generally have the characteristics of low boiling point and low ignition point. Once the battery is damaged, the electrolyte is exposed to the air, which may bring the danger of explosion. Although it is almost a dream to develop an electrolyte that has the ideal properties of a battery electrolyte and does not burn when exposed to heat or open flame, the flame resistance of the newly added electrolyte is still possible.