Utah State University

University of Colorado

Mohamed Ahmed Kamel Ahmed

Dragan Maksimovic

Regan Andrew Zane

An apparatus includes a battery pack with N battery bricks, each with a DC output voltage. The output of each brick is connected in series providing a bus voltage. Each brick includes battery power modules ('BPMs') connected in parallel and each connected to a battery cell. Each BPM charges/discharges the connected battery cell. Each brick has a battery brick controller that provides a control signal to each brick's BPMs. A control signal of a BPM is derived from a BPM error signal that includes a battery cell current of the battery cell of BPM subtracted from a summation of an average current signal, a local droop current and a balancing current. The balancing current is based on a current SOC of the battery cell connected to the BPM and a desired SOC for the battery cell connected to the BPM. A BMS derives the balancing current for the BPMs.

State-of-charge balancing with parallel and series output connected battery power modules

An apparatus for voltage sharing of series connected battery modules in a DC microgrid includes a battery management system and a battery module controller that generates, for an mof N converters connected together to a DC microbus, a droop current &#x129;that includes a converter voltage error signal {tilde over (v)}multiplied by a droop multiplier g(i). Each converter is a DC/DC converter connected between a battery module, with one or more battery cells, and the DC microbus. The mconverter uses the droop current &#x129;, a common current reference &#x129;of a battery pack that includes the battery modules and an input current &#x129;to the mconverter to control switching of the mconverter. The common current reference &#x129;is from the battery management system. The voltage error signal {tilde over (v)}is based on an output voltage {tilde over (v)}of the mconverter and an average converter output voltage {tilde over (v)}eodcmastereodcmastereodcmaster.

Growing community of inventors

Rochester, MI, United States of America

Mohamed Ahmed Kamel Ahmed