A High-Efficiency Capacitor-Based Battery Equalizer for Electric Vehicles
Alfredo Alvarez-Diazcomas1, Adyr A Estévez-Bén2, Juvenal Rodríguez-Reséndiz1
1Facultad de Ingeniería, Universidad Autónoma de Querétaro, Las Campanas, Querétaro 76010, Mexico.
Sensors (Basel, Switzerland)
|June 10, 2023
Summary
A new switched-capacitor equalizer improves electric vehicle battery safety and efficiency. This technology enables faster equalization and can manage battery state of charge for optimal performance.
Area of Science:
- Electrical Engineering
- Sustainable Transportation
Background:
- Electric vehicle (EV) technology is rapidly advancing, driven by the need to reduce transportation-related pollution.
- EV batteries, crucial for performance and cost, require cell equalization circuits for safe and efficient operation.
- Capacitor-based cell equalizers are common due to their favorable characteristics.
Purpose of the Study:
- To propose and analyze a novel switched-capacitor equalizer for electric vehicle battery packs.
- To enhance the efficiency and speed of the battery equalization process.
- To explore the use of state of charge as an equalization variable.
Main Methods:
- Development of a switched-capacitor equalizer circuit with an added switch for controlled capacitor disconnection.
- Analysis of the equalizer's operation, power design, and controller design.
- Comparative study of the proposed equalizer against existing capacitor-based architectures.
Main Results:
- The proposed switched-capacitor equalizer facilitates efficient equalization without excess energy transfer.
- The design allows for equalization based on variables like state of charge, not just voltage.
- Simulations validated the theoretical analysis of the equalizer's performance.
Conclusions:
- The novel switched-capacitor equalizer offers a more efficient and faster solution for EV battery management.
- This technology enhances battery safety and operational longevity.
- The proposed design represents a significant advancement in capacitor-based battery equalization techniques.
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