  Quantum batteries are energy storage devices that satisfy quantum mechanical
principles. How to obtain analytical solutions for quantum battery systems and
achieve a full charging is a crucial element of the quantum battery. Here, we
investigate the Rosen-Zener Quantum batteries are energy storage devices that
satisfy quantum mechanical principles. How to obtain analytical solutions for
quantum battery systems and achieve a full charging is a crucial element of the
quantum battery. Here, we investigate the Rosen-Zener quantum battery with $N$
two-level systems, which includes atomic interactions and external driving
field. The analytical solutions of the stored energy, changing power, energy
quantum fluctuations, and von Neumann entropy (diagonal entropy) are derived by
employing the gauge transformation. We demonstrate that full charging process
can be achieved when the external driving field strength and scanning period
conforms to a quantitative relationship. The local maximum value of the final
stored energy corresponds to the local minimum values of the final energy
fluctuations and diagonal entropy. Moreover, we find that the atomic
interaction induces the quantum phase transition and the maximum stored energy
of the quantum battery reaches the maximum value near the quantum phase
transition point. Our result provides an insightful theoretical scheme to
realize the efficient quantum battery.
