| 摘要 |
<p>A battery management system is disclosed for use with a battery (1) formed of serially connected sub-units. The charge output from the battery (1) is measured by a current measuring circuit (3) and the open circuit voltage across each of the sub-units (1a and 1b) of the battery (1) are measured using the voltage measuring circuit (2). The digital processor (4) is provided with memory (7) and deduces a value for the charge capacity of the battery using the measured values for the open circuit voltage and total output charge, together with information on values of open circuit voltage related to charge delivered for a range of total charge capacity values characteristic of the battery (1). Alternatively, the open circuit voltage of each of the sub-units (1a and 1b) of the battery (1) can be measured using the voltage measuring circuit (2) during a discharge cycle of the battery. A power controller (8) under the control of the digital processor (4) operates to reduce the power available from the battery when the open circuit voltage falls below a predetermined threshold, thus preventing over discharge of the battery.</p> |
