This work presents a novel technique which is simple yet effective in estimating electric model parameters and state-of-charge (SOC) of the LiFePO4 battery. Unlike the well-known recursive least-squares-based algorithms with single constant forgetting factor, this technique employs multiple adaptive forgetting factors to provide the capability to capture the different dynamics of model paramete...

This paper will describe different possible control strategies that can be implemented in hybrid electric drivetrains. A non-exhaustive list will be established of possibilities applicable on series (SHEV), parallel (PHEV) and combined hybrid vehicles (CHEV). Some examples: optimal operating point or line, time deviation limits, location (city or country), State of Charge (SoC) and vehicle spee...

Abstract To address the issue of in-phase state charge(SOC) unbalancing in a cascaded H-bridge battery energy storage system, this paper proposes novel control strategy based on nearest level modulation(NLM). Through NLM, first calculates number sub-modules needed, then adjusts priority different SOC by charging state, so that with larger deviation converge to average value. Considering large p...

This paper proposes a novel battery cell balancing topology with reduced component count and simplified control. The balancing algorithm is based on the state of charge (SOC) of each individual cell instead of cell voltage. The principle of the proposed topology is analyzed and verified through simulation and experiments. Then an experimental battery test workbench is established to validate th...

Purpose: Polarization voltage of the lithium-ion battery is an important parameter that has direct influence on battery performance. The paper aims to analyze the impedance characteristics of the lithium-ion battery based on EIS data. Design/methodology/approach: The effects of currents, initial SOC of the battery on charge polarization voltage are investigated, which is approximately linear fu...

Abstract— Battery is one of the important components in development renewable energy technology. This paper presents a method for estimating State Charge (SoC) 4Ah Li-ion battery. status capacity battery form percentage which makes it easier to monitor during use. Coulomb calculations are widely used, but this still contains errors integration. In paper, SoC measurement using Open Circuit Volta...

It is an essential task of battery management system (BMS) to online estimate the State of Charge (SoC) of a Lithium-ion (Li-ion) battery, an important indicator of the remaining charge in the battery. Accurate modeling of the electrical behavior of a Li-ion battery can provide an accurate approximation of the battery dynamic characteristics during charging/discharging and relaxation phases. Th...

A new systematic approach to state of charge (SoC) observer design for battery cells is presented. It is based on a purely data driven model and a nonlinear observer constructed from it. As a key novelty, a unified and generic framework for model generation (i.e. design of experiments, nonlinear model structure) and observer parametrisation is presented. An integral part of SoC observers in hyb...

This research is focused on state-of-charge (SOC) estimation with state-of-health (SOH) calibration for lithium-ion batteries on the basis of the coulomb counting method. The proposed approach intends to present an easy-to-use solution with high accuracy for estimating battery statuses without the need for demanding calculations or hard-earned databases. To estimate the SOC of an aged battery m...