From：CTECHI GROUP Limited Release time：2018-12-07
Overview：Lithium-ion batteries are widely used in various digital electronic products. As a rechargeable battery, compared with traditional aqueous secondary batteries, lithium-ion batteries are characterized by high specific energy, long life and low pollution. However, these characteristics also become the fatal damage of lithium batteries, especially the high specific energy. So what are the potential safety hazards of lithium batteries?
Lithium-ion batteries are widely used in various digital electronic products. As a rechargeable battery, compared with traditional aqueous secondary batteries, lithium-ion batteries are characterized by high specific energy, long life and low pollution. However, these characteristics also become the fatal damage of lithium batteries, especially the high specific energy. So what are the potential safety hazards of lithium batteries?
1. Acupuncture, Short Circuit and Extrusion
When lithium batteries are short-circuited, needled or extruded, the internal diaphragm will burst and the temperature will suddenly explode. Finally, the explosion will occur, especially the lithium batteries with poor safety. This time will be shorter, usually about 5 seconds will explode.
2. Thermal shock
The so-called thermal shock is the phenomenon of sudden rise of ambient temperature. If the temperature is high, it will lead to the decomposition of SEI film on the negative surface of lithium batteries, which will trigger the exothermic reaction. If the heat dissipation of batteries is not good, the internal temperature will rise rapidly, thus causing deflagration.
If the lithium-ion battery is overcharged, the excess energy will be converted into heat energy, which will lead to the damage of the battery body temperature rise. Often this problem occurs in some chargers or electronic products that are not overcharged and protected.
4. Safety measures of manufacturers
There are so many problems with lithium-ion batteries that it is natural to have sufficient safety measures. Manufacturers generally use three common safety measures, one is heat-sealed diaphragm, which can ensure rapid adhesion of diaphragm and prevent internal chemical reactions when needling or extrusion occurs. Secondly, PTC resistance increases with the increase of temperature. When the battery is in trouble, the resistance increases, which reduces the current and guarantees the safety of the battery. This is similar to fuse. Third, the safety valve, if the internal pressure of the battery increases, the safety valve will burst and release the internal pressure to ensure that the battery will not explode. Generally, the positive poles of cylindrical batteries have safety valves.
Although manufacturers use some safety measures to ensure the safety of lithium-ion batteries, we should pay special attention when using them. For replaceable batteries, we should try to use the original batteries, and keep ventilation and heat dissipation while charging, especially for mobile phones. It is better not to charge them on the bed. No accumulated heat causes the battery to explode. For a long time to come, lithium-ion batteries will still be the mainstream choice, and enhancing the safety of batteries is the direction of most manufacturers. I believe that in the near future, lithium-ion batteries will become safer.
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