BATTERY SYSTEM AND MANAGEMENT METHOD

摘要

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.

主权项

1. A battery system runaway protection unit, comprising:
a current sensor; a voltage sensor connected across the series string of batteries; a processor configured to accept data from the current sensor and the voltage sensor and to:
determine a charging state of the series battery string;compute a measure of the state of charge of the battery;compare a measured current of the current sensor with a state dependent threshold current;provide a warning or control signal output when the measured current exceeds the threshold current for a predetermined period of time.