METHODS OF DISCHARGE CONTROL FOR A BATTERY PACK OF A CORDLESS POWER TOOL SYSTEM, A CORDLESS POWER TOOL SYSTEM AND BATTERY PACK ADAPTED TO PROVIDE OVER-DISCHARGE PROTECTION AND DISCHARGE CONTROL

摘要

In a cordless power tool system, a battery pack which may removably attachable to a cordless power tool and to a charger may include at least one battery cell and a power limiting device. The power limiting device may be arranged in series with the at least one battery cell for limiting power output of the battery pack based on the component that is connected to the pack. Current and hence power out of the battery pack may be controlled as a function of total internal impedance in the battery pack, which may be adjusted depending on the component that is connected to the pack.