engleski

A Parameter Estimator-based Approach to Constant-Current/Constant-Voltage Charging of a Lithium-Iron-Phosphate Battery Cell

This paper presents the design of a constant-current/constant voltage charging control system for a battery cell using the so-called cascade control system arrangement with the superimposed control level commanding the battery charging current reference to the inner current control loop. The superimposed control level is realized as a double feedback loop utilizing PI controllers, combining the battery terminal voltage limitation with the open-circuit voltage estimation for the indirect control of battery state-of-charge (SoC). The battery cell open-circuit voltage is estimated using the battery equivalent circuit model within the so-called System Reference Adaptive Model (SRAM) approach. The superimposed voltage control system design is based on the damping optimum criterion which provides analytical tuning rules for the voltage limiting and open-circuit voltage controllers. The proposed concept of the battery charging control has been verified by means of simulations using the experimentally-obtained model of a lithium-iron-phosphate (LiFePO4) battery cell.

Lithium-iron-phosphate battery cell, constant-current/constant voltage charging ; parameter estimation ; system reference adaptive model ; Lyapunov stability theory

nije evidentirano