The battery-models are electrochemi

The battery-models are electrochemical, mathematical, and
electrical circuit models. Electrochemical model is
appropriated for electrode and electrolyte of battery’s modeling.
But, it has a disadvantage that too much time is spent on
calculating because the physical properties of battery are
expressed in partial differential equation. Mathematical model
is estimated with available times, efficiency and capacity using
stochastic access methods and empirical formula. However,
this model is not involved to I-V characteristic curve of the
battery and is uncertain model because of large errors. Also,
electrical model is circuit based model. Electrical models are
expressed with resistance, capacitance and inductance which
have physical characteristics of the battery. In addition, it can
be usefully taken in the electrical system and simply analyzed
in the simulation of the electrical circuit [6]. There are simple
battery model and thevenin battery model, etc in electrical
model. Simple battery model has only battery’s internal
resistance; Ri so, it can’t cover the transient behavior of the
battery. On the other hand, the thevenin battery model,
including parallel RC circuit, can represent its transient
characteristic