In the past, price was the key factor when purchasing an internal transport system that consisted, for example, of an electric forklift truck, tractionbattery and battery charger.
在过去，当人们购买内部交通系统，包括电动叉车，牵引电池和电池充电器时，价格是关键因素。
2
The fuel cell is connected with traction motor inverter directly and connected with the secondary battery and DC/DC convert in series.
燃料电池与牵引电机逆变器直接相连，与辅助电池和DC/DC器串联。
3
Precise state of charge (SOC) of tractionbattery is a key factor for power distribution of HEV power system, total control of vehicle and cost reduction.