Battery system and associated method for determining the internal resistance of battery cells or battery modules of said battery system
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United States of America Patent
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Apr 25, 2017
Grant Date -
Oct 22, 2015
app pub date -
May 24, 2013
filing date -
Jun 8, 2012
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Abstract
A method for determining the internal resistance of battery cells of battery modules of a battery includes measuring a first voltage of at least one battery cell of a first battery module at a first time. The first battery module is decoupled from the battery module string in response to a control signal. The first battery module is connected to the battery module string after the first voltage measurement to enable a change in the first voltage of the at least one battery cell in response to a current flowing through the first battery module. A second voltage is measured at a second time where the first battery module is connected to the battery module string for a predefined time interval. The internal resistance is determined with reference to a difference between the first and the second voltage and the current flowing through the first battery module.
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