Curves for the 0.25 C-rate are presented in Figure 1 with voltage as a function of SOC. Charge/discharge curves of Li-NMC differ significantly from other types of lithium cells. ... ......

In this paper, a new approach to modeling the hysteresis phenomenon of the open circuit voltage (OCV) of lithium-ion batteries and estimating the battery state of charge (SoC) is presented.

Parameter lookup tables at multiple levels of state of charge (SoC), extracted from lithium-ion (Li-ion) battery cells with four different commonly used cathode materials, have been utilized....

Accurate modeling of the nonlinear relationship between the open circuit voltage (OCV) and the state of charge (SOC) is required for adaptive SOC estimation during the lithium-ion (Li-ion) battery operation.

2025年1月10日 · Accurate state of charge (SOC) estimation is crucial for improving battery performance and efficiency. This paper models the battery using a 2-RC equivalent circuit and evaluates three SOC estimation methods: particle filter (PF), Ensemble Kalman-Bucy filter (EnKBF), and deterministic ensemble Kalman-Bucy filter (DEnKBF).

The effective management of the NMC-based battery relies on accurate estimation of its State-of-Charge (SoC) in the Battery Management System (BMS). In this paper, an effective system identification approach is applied to establish the battery model using a Continuous Transfer Function (CTF) model.

2024年2月15日 · The calibrated OCV-SoC curve achieves an overall better SoC estimation performance than that obtained from the low-current OCV test and incremental OCV test, which is validated by experiments of LiNiMnCoO 2 (NMC) batteries at 0 °C and 25 °C.

2023年8月15日 · Due to the steep SOC-OCV curve of NMC cells, the EKF algorithm based on the ECM model described in Section 2.2.1 can be used to achieve high accuracy SOC estimation. Further, the SOC estimation result of the NMC cells is used as a “ruler” to deduce the accumulated charge value over time.

2018年8月17日 · This paper presents a comprehensive comparison study on eighteen OCV models which cover the majority of models used in literature. The low-current OCV tests are conducted on the typical commercial LiFePO4/graphite (LFP) and LiNiMnCoO2/graphite (NMC) cells to obtain the experimental OCV-SoC curves at …

SOC-OCV curve for an NMC cell. With the increase in usage of electric vehicles (EVs), the demand for lithium ion (Li-ion) batteries is also on the rise. A Li-ion battery pack in an EV...