CHARGING CONTROL METHOD FOR SECONDARY CELL AND CHARGING CONTROL DEVICE FOR SECONDARY CELL

摘要

The present invention provides a method for controlling charging of a secondary cell comprising: a positive electrode containing, as a positive-electrode active substance, a positive-electrode active substance having the feature that resistance increases in accordance with an increase in the SOC; a negative electrode; and a non-aqueous electrolyte, wherein the method for controlling charging of a secondary cell is characterized in comprising: a step for performing constant-current charging at a set current value A 1 to a prescribed upper-limit voltage V 1 ; a step for performing constant-voltage charging at the upper-limit voltage V 1 after the upper-limit voltage V 1 has been reached; and a step for terminating charging of the secondary cell when the charging current in the constant-voltage charging has decreased to a cutoff current value A 2 , the cutoff current value A 2 being set to a current value that complies with the relationships in formulas (I) and (II). Cutoff current value A 2 ‰¥ set current value A 1 × X X = cell resistance R 1 of secondary cell at target SOC © / set current value A 1 �¢ A / upper - limit voltage V 1 V