Lithium-ion battery charging method for correcting and compensating voltage

A lithium-ion battery charging method for correcting and compensating voltage, comprising:

• during the charging process, starting to constant-voltage charge the battery when it is charged to the voltage limited charge voltage U;
• keeping on constant-voltage charging until the charging current decreases to 50%˜99.99% of the charging current before constant-voltage charging;
• and then stopping charging the battery, the limited charge voltage between the battery positive and negative electrodes is set as 3U0−US−USO;
• wherein,
• USO is the standard stabilized voltage dropped from U0 which the battery is charged to by constant-current and constant-voltage charging, whose value is selected by the following steps:
• when stopping constant-current and constant-voltage charging the lithium-ion battery and starting to lay up the lithium-ion battery, starting timing;
• performing division of time intervals during the timing, each time interval having a same time length;
• from some time point, the open-circuit voltage-drop of the lithium-ion battery would be smaller than a preset value during a time interval which the some time point belongs to, which means the battery voltage has already been in a stable state;
• then selecting the voltage corresponding to the first time point of said time interval as standard stabilized voltage USO of the battery;
• US is the stabilized voltage dropped from U0 which the battery is charged to by constant-current charging, whose value is selected by the following steps:
• when stopping constant-current and constant-voltage charging the lithium-ion battery and starting to lay up the lithium-ion battery, starting timing;
• performing division of time intervals during the timing, each time interval having a same time length;
• from some time point, the open-circuit voltage-drop of the lithium-ion battery would be smaller than a preset value during a time interval which the some time point belongs to, which means the battery voltage has already been in a stable state;
• then selecting the voltage corresponding to the first time point of the time interval as stabilized voltage US of the battery;
• U0 is standard charge cut-off voltage and commonly recognized by the industry as the charge cut-off voltage used by the low power, constant-current and constant-voltage charging method.