Patent ID: 8106629
Filing Date: 2012-01-31
Classification: H02J

Abstract:
1. A charging method for a battery, comprising: A) enabling a charging device to receive an actual voltage value and an actual current value of the battery; B) enabling the charging device to charge the battery with a first charging voltage and a first charging current, the first charging voltage having a value that is continuously increasing, the first charging current having a value that is constant and that is not greater than a discharge current value of the battery; C) enabling the charging device to obtain an internal resistance value of the battery based on the value of the first charging voltage, and the actual voltage value and the actual current value received in step A); D) enabling the charging device to obtain a first predetermined threshold value based on a maximum charging voltage value of the battery and a normal charging voltage value of the battery less than the maximum charging voltage value, and the internal resistance value of the battery obtained in step C), the first predetermined threshold value being less than the discharge current value of the battery; E) when it is determined that the value of the first charging voltage is equal to the maximum charging voltage value of the battery, enabling the charging device to charge the battery with a second charging voltage and a second charging current, the second charging voltage having a value that is constant and that is equal to the maximum charging voltage value of the battery, the second charging current having a value that is continuously decreasing; F) when it is determined that the value of the second charging current is not greater than the first predetermined threshold value, enabling the charging device to charge the battery with a third charging voltage and the second charging current, the third charging voltage having a value that is constant and that is equal to the normal charging voltage value of the battery; and G) when it is determined that the value of the second charging current is not greater than a second predetermined threshold value, which is less than the first predetermined threshold value, disabling the charging device from charging the battery.