A Mixed SOC Estimation Algorithm with High Accuracy in Various Driving Patterns of EVs

Abstract

In this paper, a mixed algorithm is proposed to overcome the limitations of the conventional algorithms, which cannot be applied in various driving patterns of drivers. The proposed algorithm based on the coulomb counting method is mixed with reset algorithms that consist of the enhanced OCV reset method and the DCIR iterative calculation method. It has many advantages, such as a simple model structure, low computational overload in various profiles, and a low accumulated SOC error through the frequent SOC reset. In addition, the enhanced parameter based on a mathematical analysis of the second-order RC ladder model is calculated and is then applied to all of the methods. The proposed algorithm is verified by experimental results based on a 27-Ah LiPB. It is observed that the SOC RMSE of the proposed algorithm decreases by about 9.16% compared to the coulomb counting method.

A comprehensive working state monitoring method for power battery packs considering state of balance and aging correction

“…The core factor SOC in the Battery Management System (BMS) is quite important to the battery-based energy storage and supply systems in various working conditions [5]. With respect to the cellto-cell battery difference, the technology design of the associated BMS equipment becomes more and more challenging [6], which should be investigated under the limited computational resource requirement conditions [7]. The SOC value is necessary to be estimated accurately by the BMS for the power application battery packs [8].…”

An improved packing equivalent circuit modeling method with the cell‐to‐cell consistency state evaluation of the internal connected lithium‐ion batteries

“…43 The discrete wavelet transform-based feature extraction was analyzed for the lithium-ion battery consistency by using the experimental voltage signals. A novel thermoelectric model was investigated, 42 attracting a great protection circuit progress.…”

“…A mixed estimation algorithm was proposed, in which high accuracy values can be achieved in various driving patterns of Electrical Vehicles (EVs). 43 The discrete wavelet transform-based feature extraction was analyzed for the lithium-ion battery consistency by using the experimental voltage signals. 44 The real-time SOC estimation method was conducted in the thermal storage vessels and applied to the smart polygene ration grid.…”

Open circuit voltage and state of charge relationship functional optimization for the working state monitoring of the aerial lithium-ion battery pack

“…The SOC modeling of lithium-ion batteries realized by using dual exponential functions (Kuo et al, 2016). A mixed SOC estimation algorithm was proposed with high accuracy in various driving patterns of EVs (Electric Vehicles) (Lim, Ahn, Kim, & Lee, 2016). The charge and discharge voltage and temperature pattern recognition method was studied using the double EKF, improving the SOC estimation effect to adapt different temperature working conditions (Kim et al, 2015).…”