A flux leakage self-excited drive virtual parallel battery balancing circuit and method

Abstract

In the rapidly advancing fields, particularly in electric vehicles, addressing voltage imbalances in series-connected battery packs is crucial for optimizing battery performance. This paper introduces a novel approach using a leakage magnetic selfexcitation driven virtual parallel battery equalization circuit to rectify these imbalances. The circuit design is based on a unique configuration founded on leakage magnetic self-excitation, enabling virtual parallel interconnection of battery packs through leakage magnetic induction. This innovative strategy achieves automated voltage equalization. To address the issue of voltage imbalances within serially connected battery packs, the study examines the complex structure and high costs associated with conventional voltage equalization circuits. The introduction of a leakage-type self-excitation driven virtual parallel battery equalizer circuit is shown to be imperative. This circuit aims to simplify complexity, reduce costs, and enhance battery pack performance. The exposition provides a comprehensive explanation of the architecture and operational principles of the leakage-type self-excitation-driven virtual parallel battery equalization circuit. The circuit design incorporates a leakage coil into the battery pack, utilizing the principle of leakage magnetic induction to achieve virtual parallel battery interconnection through self-excitation. Fine-tuning of circuit parameters leads to the automated attainment of voltage equilibrium among the batteries, providing significant application value and growth potential. The proposed approach is validated through simulation and analysis, offering not only novel insights but also innovative methodologies for advancing battery management technology.