Battery SOH estimation based on decision tree and improved support vector machine regression algorithm
نویسندگان
چکیده
Battery state of health (SOH) estimation is crucial for the remaining driving range electric vehicles and one core functions battery management system (BMS). The lithium feature sample data used in this paper extracted from National Aeronautics Space Administration (NASA) United States. Based on obtained samples, a decision tree algorithm to analyze them obtain importance each feature. Five groups different inputs are constructed based cumulative importance, original support vector machine regression (SVR) applied perform SOH simulation experiments group. experimental results show that four features (voltage at SOC = 100%, voltage, discharge time, SOC) can be as input achieve high accuracy. To improve training efficiency SVR algorithm, an improved proposed, which optimizes differentiability solution method objective function. Since loss function non-differentiable, smoothing introduced approximate SVR, quadratic programming problem transformed into convex unconstrained minimization problem. conjugate gradient solve smooth approximation sequential minimal optimization manner. experiment with inputs. significantly reduces time compared slight trade-off
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ژورنال
عنوان ژورنال: Frontiers in Energy Research
سال: 2023
ISSN: ['2296-598X']
DOI: https://doi.org/10.3389/fenrg.2023.1218580