Battery systems are affected by many factors, a key one being the cells unbalancing. Without the balancing system, the individual cell voltages will differ over time, battery pack capacity will decrease quickly. That will result in the failure of the total battery system. Thus cell balancing acts an important role on the battery life preserving. Different cell balancing methodologies have been proposed for battery pack. This paper presents a review and comparisons between the different proposed balancing topologies for battery string based on MATLAB/Simulink ® simulation. The comparison has been carried out according to circuit design, balancing simulation, voltage/current stress, practical implementations, application, balancing speed, complexity, balancing system efficiency, size, cost … etc.
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