A current equalizer is provided for first and second battery elements connected in parallel to supply a DC link. A first constant resistance carries a first current from the first battery element to the DC link. A first variable resistance is connected in parallel with the first constant resistance. A second constant resistance carries a second current from the second battery element to the DC link. A second variable resistance is connected in parallel with the second constant resistance. A balancer inversely adjusts the first and second variable resistances in response to relative magnitudes of the first and second currents. As a result, the total currents supplied from each battery element to the DC link are equalized because the effective total resistance in series with each battery element compensates for the difference in the internal battery resistances.
Current balancing device for parallel battery cells in an electrified vehicle
20.06.2017
Patent
Elektronische Ressource
Englisch
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