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Keywords = equivalent coulombic efficiency (ECE)

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24 pages, 712 KB  
Article
A New State of Charge Estimation Method for LiFePO4 Battery Packs Used in Robots
by Ming-Hui Chang, Han-Pang Huang and Shu-Wei Chang
Energies 2013, 6(4), 2007-2030; https://doi.org/10.3390/en6042007 - 8 Apr 2013
Cited by 36 | Viewed by 7656
Abstract
The accurate state of charge (SOC) estimation of the LiFePO4 battery packs used in robot applications is required for better battery life cycle, performance, reliability, and economic issues. In this paper, a new SOC estimation method, “Modified ECE + EKF”, is proposed. [...] Read more.
The accurate state of charge (SOC) estimation of the LiFePO4 battery packs used in robot applications is required for better battery life cycle, performance, reliability, and economic issues. In this paper, a new SOC estimation method, “Modified ECE + EKF”, is proposed. The method is the combination of the modified Equivalent Coulombic Efficiency (ECE) method and the Extended Kalman Filter (EKF) method. It is based on the zero-state hysteresis battery model, and adopts the EKF method to correct the initial value used in the Ah counting method. Experimental results show that the proposed technique is superior to the traditional techniques, such as ECE + EKF and ECE + Unscented Kalman Filter (UKF), and the accuracy of estimation is within 1%. Full article
(This article belongs to the Special Issue Li-ion Batteries and Energy Storage Devices)
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