| 摘要 |
The invention relates to a battery monitoring system comprising a battery and a monitoring device (L), the battery in the system comprising at least four voltage units (B1-B4) connected in series, each unit comprising a terminal with a higher potential and a terminal with a lower potential, an electric coupling (S) being arranged at the terminals, and electric conductors (J) being connected to the electric couplings (S) of each voltage unit, the conductors being connected in electric contact with the monitoring device (L) for monitoring the voltages provided by the voltage units (B1-B4). The monitoring device (L) comprises, for monitoring the four voltage units (B1-B4) connected sequentially in series, a first difference voltage measuring member for measuring the difference voltage of the voltages across two adjacent voltage units (B1, B2), a second difference voltage measuring member for measuring the difference voltage of the voltages across the other two adjacent voltage units (B3, B4), a third difference voltage measuring member for measuring the difference voltage between the sum voltage across the two first-mentioned adjacent voltage units (B1, B2) and the sum voltage across said other two adjacent voltage units (B3, B4), and comparing means for comparing said difference voltages with a preset alarm limit value and for providing an alarm signal when at least one difference voltage exceeds the alarm limit value.
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