BATTERY SYSTEM AND MANAGEMENT METHOD
First Claim
22. A method of protecting a battery system from thermal runaway, comprising:
- measuring the current of a battery stringmeasuring the voltage of the battery string;
determining the charging state of battery string as one of charging, discharging or fully charged;
determining the state of charge of the battery string;
determining threshold current and delay time criteria for each of a fully charged state and a charging state, wherein a threshold in the charging state is related to an averaged battery string current value for the charging state; and
providing an alarm or control signal when the threshold in a charging state or in a fully charged state is exceeded by the measured current for greater than the delay time criteria for the threshold.
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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.
53 Citations
30 Claims
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22. A method of protecting a battery system from thermal runaway, comprising:
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measuring the current of a battery string measuring the voltage of the battery string; determining the charging state of battery string as one of charging, discharging or fully charged; determining the state of charge of the battery string; determining threshold current and delay time criteria for each of a fully charged state and a charging state, wherein a threshold in the charging state is related to an averaged battery string current value for the charging state; and providing an alarm or control signal when the threshold in a charging state or in a fully charged state is exceeded by the measured current for greater than the delay time criteria for the threshold. - View Dependent Claims (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 23, 24, 25, 26, 27, 28, 29)
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28-1. The method of claim 22, wherein at least one threshold value in the fully charged state is a constant current value.
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30. A software program product, stored on a non-transitory medium, comprising:
instructions executable by a processor to perform the steps of; measuring the current of a battery string measuring the voltage of the battery string; determining the charging state of battery string as one of charging, discharging or fully charged; determining the state of charge of the battery string; determining threshold current and delay time criteria for each of a fully charged state and a charging state, wherein a threshold in the charging state is related to an averaged battery string current value for the charging state; and providing an alarm or control signal when the threshold in a charging state or in a fully charged state is exceeded by the measured current for greater than the delay time criteria for the threshold.
Specification