Abstract
Active battery equalization and passive battery equalization are two important methods which can solve the inconsistency of battery cells in lithium battery groups. In this paper, a new hybrid battery equalization strategy combinfigureing the active equalizing method with a passive equalizing method is proposed. Among them, the implementation of the active equalizing method uses the bidirectional Flyback converter and Forward converter. This hybrid equalizing strategy adopts the concept of hierarchical equilibrium: it can be divided into two layers, the top layer is the equalization between groups, and the bottom layer is the equalization of group. There are three active equilibrium strategies and one passive equilibrium strategy. For verification purposes, a series of experiments were conducted in MATLAB 2018b/Simulink platform. The simulation and experiment results show that this hybrid battery equalizing method is efficient and feasible.
Highlights
The advantages of a lithium-ion battery are its high-energy density, low self-discharge rate, cycling durability, and wide temperature range [1]
If the the condition target battery and the source battery are in the active same equalization group, andisthe dothis not satisfy case, the topology adopts the passive equalization, which is very suitable for the equalization with the condition that the voltage difference is large enough, active equalization is not suitable
That there are n cells in the battery group, and the equalization efficiency of each sub-equalizer is n cells in the battery group, and the equalization efficiency of each sub-equalizer is η
Summary
The advantages of a lithium-ion battery are its high-energy density, low self-discharge rate, cycling durability, and wide temperature range [1]. The passive sub-circuit each battery a MOSFET traditional converter topology. Can realize bidirectional energy flow between the battery groupThe and between-group equalization can realize bidirectional energy flow between the battery group and the the entire power supply system This topology is a double-layer hybrid topology. The active equalization sub-circuit in each group can flexibly realize the energy exchange between cells. It is supplemented by a passive equalization circuit. If the target battery and the source battery are on different sides of the battery group, the energy
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