A high-fidelity lithium-ion battery emulator for electric vehicle application

Area of Science:

• Electrical Engineering
• Materials Science
• Automotive Engineering

Background:

• Lithium-ion (Li-ion) batteries are pivotal for electric vehicle (EV) development.
• Diverse Li-ion battery chemistries from various manufacturers pose challenges for battery management system (BMS) verification.
• Accurate simulation of battery performance is essential for reliable BMS testing.

Purpose of the Study:

• To propose and validate a high-fidelity Li-ion battery emulator specifically designed for EV applications.
• To enable comprehensive performance verification of BMS across different Li-ion battery chemistries.

Main Methods:

• Development of a high-fidelity Li-ion battery emulator using a parameterized battery model.
• Implementation of a specialized hardware platform integrated with a three-order equivalent circuit model (ECM).
• Parameterization of the ECM using performance tests on a 37 Ah Nickel Manganese Cobalt (NMC) battery across temperatures (-30°C to 45°C) and charge/discharge conditions.

Main Results:

• The proposed emulator accurately generates voltage and current signals based on the parameterized ECM.
• Validation confirmed the emulator's accuracy and dynamic performance in both charge and discharge modes.
• The system demonstrated reliable performance across a wide temperature range.

Conclusions:

• The developed high-fidelity Li-ion battery emulator effectively simulates battery behavior for EV applications.
• This tool provides a reliable method for verifying BMS performance with diverse battery chemistries.
• The emulator's accuracy and dynamic response are suitable for rigorous testing protocols.