TY  - EJOU
AU  - Wu, Tiezhou 
AU  - Zhang, Yukan 

TI  - Lithium-Ion Battery Pack Based on Fuzzy Logic Control Research on Multi-Layer Equilibrium Circuits
T2  - Energy Engineering

PY  - 2024
VL  - 121
IS  - 8
SN  - 1546-0118

AB  - In order to solve the problem of inconsistent energy in the charging and discharging cycles of lithium-ion battery packs, a new multilayer equilibrium topology is designed in this paper. The structure adopts a hierarchical structure design, which includes intra-group equilibrium, primary inter-group equilibrium and secondary inter-group equilibrium. This structure greatly increases the number of equilibrium paths for lithium-ion batteries, thus shortening the time required for equilibrium, and improving the overall efficiency. In terms of control strategy, fuzzy logic control (FLC) is chosen to control the size of the equilibrium current during the equilibrium process. We performed rigorous modeling and simulation of the proposed system by MATLAB and Simulink software. Experiments show that the multilayer equilibrium circuit structure greatly exceeds the traditional single-layer equilibrium circuit in terms of efficacy, specifically, the Li-ion battery equilibrium speed is improved by 12.71% in static equilibrium, 14.48% in charge equilibrium, and 11.19% in discharge equilibrium. In addition, compared with the maximum value algorithm, the use of the FLC algorithm reduces the equalization time by about 3.27% and improves the energy transfer efficiency by about 66.49% under the stationary condition, which verifies the feasibility of the equalization scheme.
KW  - Lithium-ion battery for new energy vehicles; lithium-ion battery equilibrium; fuzzy logic control

DO  - 10.32604/ee.2024.049883