BATTERY SYSTEM AND MANAGEMENT METHOD
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Abstract
A system and method for monitoring the status of a system of battery strings is described. The battery string current is measured by a current sensor urged into contact with a metallic element in which the battery string current is flowing. The time history of the battery string current and voltage is interpreted to determine whether the battery string is discharging, charging or in a fully charged state. A moving average current in the charging state is used to establish a threshold for determining whether a thermal runaway condition exists. The moving average is maintained at the value that existed at a time when the battery string has been disconnected from the system current bus.
2 Citations
8 Claims
- 1. (canceled)
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2. A method of measuring current for use in a storage battery system runaway protection unit, comprising:
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positioning a pair of metallic probes spaced apart along a length of the insulating plate; orienting the insulating plate such that a fictive line joining a first metal probe and a second metal probe is oriented parallel to a direction of current flow in a metalic conductor whose current is to be measured; providing a voltage measuring circuit; urging the pair of metallic probes against the conductor surface so as to form electrical contacts therebetween having a resistance substantially less than a resistance of the voltage measuring circuit; measuring a first voltage between the pair of metallic probes and computing an estimate of the current in the metallic conductor as being proportional to the measured voltage; measuring a second voltage between connections at a first end of a storage battery string and a second end of a storage battery string; determining whether the storage battery system is in a runaway state; providing an output signal when the storage battery system is in a runaway state. - View Dependent Claims (3, 4)
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Specification