Study on the configuration of LiCoxNiyMn1-x-yO2 - LiFePO4 hybrid battery pack

Abstract

The “LiCo_xNi_yMn_1-x-yO₂-LiFePO₄” hybrid battery pack is employed to mitigate drawbacks and fully leverage the distinct advantages of these two types of cells. Nonetheless, the fundamental statistics of the two types of cells diverge significantly, and the different cell configurations lead to the different output performances of the hybrid battery pack. Therefore, the different capacity and initial electricity thresholds configurations of the hybrid battery pack for various configurations are researched to achieve the diverse output performances. Firstly, a new approach based on electrochemical equivalent circuit model is introduced to simplify the parameter calibration process. Secondly, a series-connected hybrid battery pack simulation model with electrical-thermal-aging coupling is established to achieve the high-precision of capacity and aging simulation, which effectively replaces the physical experiments. Finally, the unchanged available electricity theory of the hybrid battery pack under a wide range of temperature scenarios is constructed based on the configurations of heterogeneous cells under different configuration, which provides a reference to the development of equalization algorithms. Furthermore, even if the aging rate of the heterogeneous cells is inconsistent, the configuration of the hybrid battery pack still could maintain the consistent output characteristics.