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- Management System for Large Li-Ion Battery Packs with a New Adaptive Multistage Charging MethodPublication . Velho, Ricardo Lopes; Beirão, Miguel; Calado, M. do Rosário; Pombo, José Álvaro Nunes; Fermeiro, J.B.L.; Mariano, S.Among the wide diversity of existing technologically mature batteries, lithium-ion (Li-ion) batteries have become popular because of their longevity, high energy density, high efficiency and lack of memory effect. Differential charging of cells with age has turned balancing management systems into an important research subject. This paper proposes a new battery management system (BMS) to improve the capacity usage and lifespan of large Li-ion battery packs and a new charging algorithm based on the traditional multistage method. The main advantages of the proposed system are its versatility and ability to implement different charging and balancing methods in a very accessible way. The combination of charging methods with balancing methods represents an evolution when compared with other works in the literature.
- Lookup Table Based Intelligent Charging and Balancing Algorithm for Li-ion Battery PacksPublication . Velho, Ricardo Lopes; Pombo, José Álvaro Nunes; Fermeiro, J.B.L.; Calado, M. Do Rosário; Mariano, S.In this article, an energy storage system (ESS) and its entire monitoring system are implemented. A new charging algorithm is developed based on the parameters of the battery pack in real time, extending the battery lifespan, improving the capacity usage and performance of the ESS. The proposed algorithm analyses, in real time, the difference between the desired voltage and the mean voltage of the cells, the temperature of the pack, and the difference of voltage between cells. Based on the obtained information, by trilinear interpolation, the algorithm calculates the charging current. The proposed charging algorithm also combines a balancing algorithm. This represents an innovation compared to the existing methods in the literature. The experimental results demonstrate that the proposed algorithm can successfully charge Li-ion battery packs with different capacities and life cycles, providing a better charging time and a much lower temperature increase.