| 摘要 |
A device for rapidly charging a battery using a constant current-constant voltage method comprise a charging power control unit, a central processing unit, a voltage detection unit, and a current detection unit. A method thereof comprises a virtual overvoltage charging step for setting an overvoltage larger than a normal charging completion voltage and performing charging based on the virtual overvoltage when an output terminal voltage of a battery reaches the normal charging completion voltage during charging with a constant current; and a normal charging step for finishing the overvoltage charging and performing normal charging based on the normal charging completion voltage when a charging current satisfies an overvoltage charging completion condition during charging with the overvoltage. The overvoltage charging step comprises a step for stopping the charging for one second when the output terminal voltage reaches the normal charging completion voltage and measuring an OCV; a step for calculating a drop voltage as a difference between the OCV and the output terminal voltage; a step for calculating an internal resistance estimated value by dividing the drop voltage by a current charging current; a step for setting a lower value among a drop voltage compensation value where a predetermined discount rate is applied to the drop voltage, and a preset terminal voltage limit value, as a virtual overvoltage; a step of performing charging with a constant current using the virtual overvoltage and the charging current; and a step for performing charging with a constant voltage until the charging current drops to a preset target current when the output terminal voltage reaches the virtual overvoltage. Therefore, the time for charging a battery can be reduced. [Reference numerals] (AA,DD,EE) No; (BB,CC,FF) Yes; (GG) End; (S300) Charge an overvoltage; (S310) Stop charging for one second; (S320) Measure the battery voltage; (S330) Derive a drop voltage (dropV) and a predicted value (expIR) of an internal resist; (S340) Set a virtual overvoltage (vrV); (S350) Charge constant current; (S360) Is target voltage reached?; (S370) Charge constant voltage; (S380) Less than the lowest current?; (S390) Is the target current reached? |
