Lithium ion battery has high energy density and high average output voltage. Small self discharge, good battery, less than 2% per month (recoverable). No memory effect. The working temperature range is -20 ~ 60 C. It has excellent cycling performance, fast charge and discharge, high charging efficiency of 100%, and high output power. Long service life. No toxic or harmful substances are called green batteries.
Charging is an important step in battery reuse. The charging process of lithium ion batteries is divided into two stages: constant current fast charging stage and constant voltage current decreasing stage. In the constant current fast charging stage, the voltage of the battery gradually rises to the standard voltage of the battery, and then goes to the constant voltage stage under the control chip. The voltage no longer rises to ensure no overcharge. The current gradually decreases to the set value with the increase of the battery capacity, and finally the battery is charged. The power statistics chip can calculate the battery power by recording the discharge curve. The discharge curves of lithium-ion batteries will change after repeated use. Although there is no memory effect in lithium-ion batteries, improper charge and discharge will seriously affect the battery performance.
The first charge and discharge, if the time is long enough (usually 3-4 hours), can make the electrode as much as possible to reach the highest oxidation state (sufficient electricity), discharge (or use) is forced to put the specified voltage, or until the automatic shutdown, so as to activate the battery capacity.
But in the ordinary use of lithium-ion batteries, do not need this operation, can be charged at any time according to needs, charging is neither necessary to be charged until, nor need to discharge first. Like the first charge and discharge operation, it only takes 1–2 consecutive intervals every 3–4 months.