In the present study, we propose a new concept of battery system to achieve both high power and high energy at once by externally hybridizing a high power LiB with a high energy LiB in a single system, so called “hybrid battery (HB)”. To investigate the feasibility of the concept, we construct a mathematical model of a HB system as shown in figure 1. Three LiBs are connected in parallel. Two of them are high power LiBs and the other is high energy LiB. Conducting computational simulations with the developed model, basics characterization (OCV, resistance, C-rate performance) of the hybrid battery system is investigated for the first time. Then, we examine the performance of the hybrid battery under various operating conditions. Also, charging/discharging interactions among LiB members are monitored. To validate the present HB concept with the developed mathematical model, an actual hybrid battery system is constructed by using three automotive LiBs. Basic characterization and simulated driving test shows a good agreement with the theoretically predicted result. Through the present study we confirm the validity of the HB concept for automotive applications.
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