Battery charging device and charging method with temperature compensation

Abstract

A method for controlling a battery charging device (1) for charging an energy storage device (5) with at least one lithium-based cell (6) comprises the following steps: determining the cell voltage (Ucell) of the cell (6) and supplying a constant charging current (ICC) to the cell (6) when the determined cell voltage (Ucell) is less than a first threshold (UT), and monitoring the cell voltage (Ucell). If the monitored cell voltage (Ucell) is greater than a second threshold (UT2), a charging current (ICP) less than the constant charging current (ICC) is supplied to the cell (6), and the cell voltage (Ucell) is monitored. The method determines the temperature of the energy storage device (5) and sets the second threshold (UT2) depending on the determined temperature of the energy storage device (5).