Battery having discharge state indication

摘要

A storage battery of the conventional kind for supplying power to electrical devices has a supervising unit (37) for determining the electric capacity. The supervising unit is electrically connected to terminal posts (19) of the battery in order to measure the battery voltage and also measures the battery current. Measurement posts (31) are connected to the end cells of the battery in parallel to the terminal posts (19) and to the supervising unit through bridges (34). The supervising unit (37) also measures the voltage between the measurement posts (31) and the difference between the measured voltages is a measure of the current flowing through the battery, this difference voltage corresponding to a sum of the voltages over portions of the terminal posts and the bridges (34). From this difference voltage the current through the battery is calculated and therefrom the remaining electric capacity of the battery is determined by repeating regularly the measurement. The addition of measurement posts in a storage battery can be made rather easily by modifying the moulding of the terminal posts.