Is there some risk of charging lithium batteries in low temperatures?

   18650 batteries cycled at low temperatures are prone to precipitation of lithium metal with a high specific surface area, and the morphology of lithium metal is related to current density, voltage and other factors. Meanwhile, the stability and pinprick test of the uncirculated battery and the battery after low-temperature cycling can be concluded that the electrolyte plays an exceptionally tight use in it.

   Lithium-ion batteries encounter different environments in the course of use, and in winter the temperature in the northern part of China is often below 0℃ or even -10℃. When the battery charging and discharging temperature is reduced to below 0℃, the capacity and voltage of lithium-ion battery charging and discharging will be sharply reduced. This is because the mobility of lithium ions in the electrolyte, in the SEI, and in the graphite particles is reduced at low temperatures. Such a harsh low-temperature environment will inevitably bring about the precipitation of a high percentage of surface area lithium metal.

   Charging li-ion batteries in a low-temperature environment carries certain risks. Because as the temperature decreases, the kinetic properties of the graphite anode progressively deteriorate, and during charging, the electrochemical polarization of the anode is obviously intensified, and the precipitated lithium metal is prone to form lithium dendrites, which can break through the diaphragm and lead to a short circuit at the positive and negative electrodes. Try to avoid charging lithium-ion batteries at low temperatures.

   Discharge at the same multiplier, when the lower the external temperature, the lower the discharge voltage of 18650 lithium-ion battery pack. When the temperature decreases, the power lithium-ion battery discharge voltage is also significantly reduced, so that the battery will reach the discharge cut-off voltage faster when discharged at low temperature, resulting in low temperature discharge capacity is significantly lower than the room temperature capacity. So low temperature has a certain impact on the performance of the battery and its use.