This diaphragm prevents electrons from passing through, so the electrons can only flow out of the external circuit, causing the external circuit to generate current. But this membrane lets lithium ions pass through. The separator of a lithium battery also prevents the positive and negative electrodes from coming into direct contact. If the positive and negative terminals are in direct contact, a short circuit will occur, causing the battery to explode and catch fire. When using lithium batteries, do not do this
The role of the separator in lithium batteries
This separator prevents electrons from passing through, so the electrons can only exit the external circuit, causing the external circuit to generate current. But this membrane lets lithium ions pass through.
The separator of a lithium battery also prevents the positive and negative electrodes from coming into contactdirect side. If the positive and negative terminals are in direct contact, a short circuit will occur, causing the battery to explode and catch fire.
When using lithium batteries, do not waste or puncture the battery, as this may damage the diaphragm.
If the separator of a lithium battery is broken, it is very dangerous.
Lithium battery is an excellent battery with high energy density and light weight.
The batteries we usually use in cell phones, tablets and laptops are lithium batteries.
There are two types of lithium batteries used in pure electric vehicles, one is lithium iron phosphate battery and the other is ternary lithium battery.
The energy density of ternary lithium batteries is higher than that of lithium batterieslithium iron phosphate batteries, but the safety of lithium iron phosphate batteries is better than that of ternary lithium batteries.
Ternary lithium batteries start burning at 200 degrees Celsius, but lithium iron phosphate batteries start burning at 800 degrees Celsius.
Most pure electric vehicles use ternary lithium batteries because they are lighter and have higher energy density.
And many automakers have done a lot of work to improve the safety of ternary lithium batteries.
Why do lithium batteries explode?
Lithium battery explosions are caused by thermal runaway or damage to the diaphragm.
Thermal runaway is easy to understand, it is overheating. If the lithium battery overheats, it will catch fire and explode.
There is a separator inside the lithium battery. If the separator is damaged, the positive and negative electrodes will be in direct contact, resulting in a short circuit.
If the battery is short-circuited, the battery will also explode instantly.
Therefore, when using lithium batteries, do not damage or puncture the batteries, as this is very dangerous.
When charging, do not overcharge, and the voltage and current should not exceed the specified values.
If the voltage and current exceed the specified values, the temperature of the lithium battery will also be too high, which may easily cause the lithium battery to explode and catch fire .
Therefore, it is recommended to use the original charger when charging.
There are two types of lithium batteries commonly used in electric vehiclespure batteries, one is lithium iron phosphate battery and the other is ternary lithium battery.
Ternary lithium batteries have high energy density and light weight, but their safety is not good.
Lithium iron phosphate batteries are safe but have low energy density.
Lithium iron phosphate batteries will only burn at 800℃, and ternary lithium batteries will start burning at 200℃.
Major automakers are constantly looking for ways to improve the safety of ternary lithium batteries.
If used normally, ternary lithium batteries are still very safe. The role of separators in lithium batteries Why are lithium batteries exploding in 2019