Why lithium power batteries requires heat?

- Apr 27, 2020-

For energy saving and environment protection, now the new energy automobile is a trend. The new energy automobile are using lithium electronic power batteries to supply power instead of traditional gas. 

While lithium electronic power batteries cannot be charged at low temperatures. Current mobile batteries basically use graphite as the negative electrode and lithium hexafluorophosphate carbonate solution as the electrolyte. At low temperatures, the conductivity of the electrolyte will decrease, and the impedance of the graphite negative electrode's SEI film will increase. At this time, if it is charged without heating, it will cause two problems. One is that the charging voltage rises to the cut-off voltage and then stops charging, which means that the charging cannot be powered on. The second problem is damage to the battery. The occurrence of lithium element precipitation on the surface of the negative electrode damages the life of the battery and there are hidden safety risks.

Therefore, in general, if the temperature is below 0 degrees in winter, the lithium-ion power battery is not allowed to be charged. It must be heated to 0 to 5 degrees Celsius before recharging. The heaters we generally use to heat lithium-ion power batteries will use silicone heaters and PTC heaters.