Nickel metal hydride batteries in bipolar design offer significant advantages as a power storage system for electric vehicles. This study deals with some aspects in structure design and development of bipolar nickel metal hydride batteries. An improvement on conventional bipolar structure was made, and some novel sealed bipolar nickel metal hydride batteries with 6 cells were assembled and studied. Testing results showed that the improved structure effectively protected the worst single cell of bipolar battery, and led to a better pressure and cycle performances of novel batteries compared with conventional ones. In addition, the improved bipolar batteries showed excellent discharge and recharge ability, and low resistance in electrochemical tests. As simulating hybrid electric vehicle working conditions, the batteries displayed good stability during pulse cycles, which indicated the possibility of being used on electric vehicles.
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