Why can not fast charge full power? In fact, from the literal meaning, this sentence is expressed more Why can not maintain fast charging the battery is full of power. In the actual charging, fast charge verge of full power, such as 90%, a sharp decline at this time power to the normal charged state. This is the principle behind what has or cause it? Following in the answer for you.
protect the battery pack
fast charge, is quickly charged, to a high voltage, high current state continue to add power to the battery pack, which is a certain physical damage, chemical principles behind we will not go into too much for the lithium battery itself. In addition, in order to protect lithium batteries, generally at low or high power consumption, it will not be charged with a high-power, which is why we often find a reason for the fast charge will mark the interval values. Taken together, in order to protect the battery, trickle charging at the low power end extenuating.
to ensure the safety ensuring that the temperature
fast charging, high voltage high current charging of the battery pack itself will in addition cause addition to some damage in the fast charge process will be accompanied by a lot of heat is generated, this heat piled together for the safety of the battery pack is concerned with the higher threat. In order to control the temperature of the battery pack, and to consider the safety of the fast charge duration tend to be strictly controlled, which is why many pure electric car is not always at a steady fast charging power to the battery pack is fully reasons.
Summary: In general, protect the battery pack ensure that the battery pack temperature, ensure safety, this is not fast charge power sustainable and stable way, or for some reason can not fast charge the battery fully charged. I hope my answer can help to you.