Virtual High-Voltage Batteries - Simulating and emulating multicell batteries to develop battery management systems

16th June 2011
Source: dSPACE Ltd
Posted By : ES Admin
Virtual High-Voltage Batteries - Simulating and emulating multicell batteries to develop battery management systems
dSPACE's latest addition to its Automotive Simulation Models (ASM) simulation package is a new battery model for simulating high-voltage rechargeable batteries. The model is designed to virtualize the rechargeable lithium-ion, nickel-metal hydride (NiMH) and lead batteries used for the electrification of vehicle drivetrains. The 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.
New simulation model virtualizes high-voltage batteries
Offline simulation for developing battery management system functions
Cell voltage emulation on a HIL simulator
Realistic Battery Simulations

The new ASM multicell battery 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.
And with the intuitive user interface of dSPACE ModelDesk, even the comprehensive parameterization of multicell simulations is easy to handle.

Highly Precise Battery Cell Emulation
The ASM 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.

Turnkey Laboratory Systems
The new, real-time-capable cell model and the new, highly precise emulation unit for outputting the cell clamp voltage fulfill all the major requirements for testing battery management system ECUs by HIL simulation reproducibly and under automated control. 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.

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