Energies 2015, 8(8), 7703-7728; doi:10.3390/en8087703 Article A Novel Grouping Method for Lithium Iron Phosphate Batteries Based on a Fractional Joint Kalman Filter and a New Modified K-Means Clustering Algorithm Xiaoyu Li,  Kai Song,  Guo Wei * ,  Rengui Lu and   Chunbo Zhu *  + Authors’ affiliation  Received: 27 May 2015 / Revised: 1 July 2015 / Accepted: 22 July 2015 / Published: […]