dSpace simulation model virtualizes high-voltage batteries

June 14, 2011 // By Christoph Hammerschmidt
Engineering tool vendor dSpace GmbH (Paderborn, Germany) has added a new battery model to its Automotive Simulation Models (ASM) simulation package. The model is designed to virtualize rechargeable lithium-ion, nickel-metal hydride (NiMH) and lead batteries used for the electrification of vehicle drivetrains.

The new high-voltage multicell battery model facilitates function development for battery management systems (BMS) and also the testing of close-to-production electronic control units (ECUs). Model-in-the-loop (MIL) simulations in Simulink and hardware-in-the-loop (HIL) simulations on the simulator are used for this.

The model supports the elementary functions of current battery management systems, such as cell balancing. It simulates every single battery cell to represent the cell-specific charges, voltages and currents. The computations are performed in real time, no matter how many cells there are.

Physical parameters such as internal resistance, diffusion and double-layer capacities can be defined for each cell. The model also includes leakage currents such as those due to outgassing when NiMH cells are charged.

The real-time-capable ASM cell model can be combined with dSpace's new controllable EV1077 buffer amplifier modules to build a complete battery cell emulation. The galvanically isolated voltage is output with a precision of ±1.5 mV across the entire working temperature range. The modules can be switched in series to achieve a total voltage of up to 1000 V.

The model and the new emulation unit for outputting the cell clamp voltage fulfill all major requirements for testing battery management system ECUs by HIL simulation reproducibly and under automated control, the vendor states. For laboratory use, turnkey simulators are available for component testing of single ECUs and also for integration testing of an ECU network. Thus, the multicell battery model seamlessly supports the entire development process from function design to production release for the BMS ECUs.

For further information please visit www.dspace.com.