Least‐squares based coulomb counting method and its application for state‐of‐charge (SOC) estimation in electric vehicles |
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| Authors: | Li Zhao Muyi Lin Yong Chen |
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| Affiliation: | 1. Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing Information Science and Technology University, Beijing, China;2. National Engineering Laboratory for Electric Vehicles, Beijing Institute of Technology, Beijing, China;3. State Key Laboratory of Automotive Safety and Energy, Beijing 100084, China |
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| Abstract: | Coulomb counting method is a convenient and straightforward approach for estimating the state‐of‐charge (SOC) of lithium‐ion batteries. Without interrupting the power supply, the remaining capacities of them in an electric vehicle (EV) can be calculated by integrating the current leaving and entering the batteries. The main drawbacks of this method are the cumulative errors and the time‐varying coulombic efficiency, which always lead to inaccurate estimations. To deal with this problem, a least‐squares based coulomb counting method is proposed. With the proposed method, the coulombic losses can be compensated by charging/discharging coulombic efficiency η and the measurement drift can be amended with a morbid efficiency matrix. The experimental results demonstrated that the proposed method is effective and convenient. Copyright © 2016 John Wiley & Sons, Ltd. |
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| Keywords: | coulomb counting method state of charge (SOC) coulombic efficiency (CE) least squares (LS) |
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