Tolerances within static interconnected cells in automotive battery packs are limiting the overall usable capacity. This dissertation investigates the cascaded H-Bridges (CHB) inverter as an alternative interconnection. Actual cell variations are reviewed, a control strategy is defined, the most suitable state estimator is identified, and the inverter configuration is optimized. The actual capacity gain is limited for high quality cells. However, the efficiency is increased by 5.3 % and total vehicle costs are reduced by USD 2,647. Cells with increased tolerances and therefore potentially decreased costs are enabled.
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Tolerances within static interconnected cells in automotive battery packs are limiting the overall usable capacity. This dissertation investigates the cascaded H-Bridges (CHB) inverter as an alternative interconnection. Actual cell variations are reviewed, a control strategy is defined, the most suitable state estimator is identified, and the inverter configuration is optimized. The actual capacity gain is limited for high quality cells. However, the efficiency is increased by 5.3 % and total ve...
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