MODULAR MULTILEVEL BATTERY

MODULAR MULTILEVEL BATTERY

Challenge

Nowadays concepts for electromobiles are based besides motor and battery on many different components as e.g. battery power supplies, converters, inverters and filters. This ensemble of components has some disadvantages: (i) The interplay between the components is not optimized in respect to efficiency resulting in unnecessarily limited driving ranges. (ii) Propulsion is based on IGBT-technology which inherently turns 3%-10% of energy into heat and therefore demanding designs for thermal management. (iii) Loading the battery system from different sources requires a choice of matching inverters/converters. (iv) Balancing of State-of-charge levels of different battery cells introduces losses. These are just a few of the problems addressed by innovative modular multilevel converter (MMC, compare Reference No. B71203) concept allowing parallel connectivity of cells.

Innovation

The Modular Multilevel Battery (M2B) is a MMC-system included in the battery system. M2B has full functionality of power electronics like inverters, converters, chargers (220-800V, 10-350A, AC/DC) as well as a loss free battery management system. Intelligent control allows about 20% higher overall efficiency (and travelling range) compared to IGBT-based systems. Further advantages are expendebility of filters, possibility of vehicle-2-vehicle charging, bidirectionality, hot swapping cells, optimum recuperation, lower costs, ...

Commercial Opportunities

  • Electromobility
  • Power storage

Development Status

prototype running

Figure: The modular multilevel battery (M2B) concept is a topology integrating all necessary functions of power electronics into the battery system, i.e. motor and external sources are directly linked to the battery system. Inverters, converters etc. are not needed anymore.

Reference

F. HELLING, J. GLÜCK, A. SINGER, AND T. WEYH, “MODULAR MULTILEVEL BATTERY (M2B) FOR ELECTRIC VEHICLES,” IN EPE 2016-ECCE EUROPE - 18TH EUROPEAN CONF. ON POWER ELECTRONICS AND APPLICATIONS

Dr. Roland Schanz
E-Mail:
Phone:
Reference Number:
rschanz@baypat.de
+49 (0) 89 5480177 - 17
B73264