在恒压充电密度区域，所有的电流都为闭合电路。
In regions of constant charge density, all currents flow in closed loops.
新型电池还要能够快速充电和放电，这称为电能密度。
They also have to absorb energy and give it back quickly, a factor called power density.
该公司称，他们已经开发了一种微型涡轮发动机，其中包括车载充电器和高密度电池。一次充电能驱动汽车行进60 - 80千米。
It says it has developed a micro-turbine engine to act as an on-board charger and a high-density battery that can power a vehicle for about 60-80 km (35-50 miles) on one charge.
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