Distributed State-of-Charge Estimation for Lithium-Ion Batteries with Random Sensor Failure Under Dynamic Event-Triggering Protocol

The state of charge (SOC) performs as an indicator of the remaining capacity of the lithiumion batteries (LBs). An accurate SOC estimation of LB is of great significance for its operation optimization and life extension of the battery. In this article, the issue of distributed SOC estimation is addressed for LBs. To design the distributed filter for SOC estimation, the equivalent circuit model comprised of the resistor-capacitor networks, Warburg element, ohmic resistance, battery current and voltage is established. By introducing a set of Bernoulli-distributed sequences with known probabilities, the properties of the random sensor failure (RSF) is well described. For the purpose of saving communication resources, the dynamic event-triggering mechanism (DETM) is adopted to regulate transmission of the signals. The objective of the article is to design a distributed SOC estimation approach for LBs subject to RSF under DETM where the upper bound of the estimation error covariance is first ensured and then be minimized by parameterizing the estimator gain. In addition, by virtue of the matrix simplification technique, the issue of sensor network topology's sparseness is effectively tackled. At last, experimental examples are employed to validate the feasibility of the developed distributed SOC estimation algorithm.