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Continuously increasing requirements for on-board system performances lead tonew topologies for the energy distribution in vehicles. One promising conceptis the usage of a dual-battery system instead of the conventional lead-acid“starting lightening ignition” battery. As this system is not able tocontrol the current share between the two batteries, its performance dependson the actual battery specific operating points.The initial conditions ofstate of charge, voltage level and temperature influence the current shareand lead to a different voltage drop of the system. This paper yields to, thebasic understanding of the current share between the two batteries. Theconventional performance estimation method for standalone lead-acid batteriescan no longer be applied to this system. Therefore, a new algorithm for thevoltage drop calculation of the dual-battery system is proposed. Measurementsat different temperatures, states of charge and voltage levels show thesystem behavior and prove the functionality of the algorithm

Predictive performance estimation for a dual-battery system in mild-hybrid vehicles