高功率薄型金属双极板PEM燃料电池堆研究

对高功率车用薄型金属双极板PEM燃料电池堆模块进行测试研究.电池堆模块可在空气压力110～300 kPa条件下工作,表现出良好的高、低压兼容特性.当空气压力300 kPa,电池堆温度70℃,工作电流350 A时,电池堆输出功率可达27.2 kW,其质量和体积比功率分别为777 W/kg和1 015 W/L.单电池电压方差求和计算结果显示,在工作电流50～120A的窗口区间内,单池电压具有相对最好的均匀一致性.在320A(约为1 A/cm2)放电电流下,使用纯氢/氧气的电池堆输出功率比使用氢/空气高出约10%.空气相对湿度影响测试结果,电池堆较低功率下,空气的相对湿度80%～100%为佳;而当高功率下,空气相对湿度80%为佳.另外,对4单体薄型金属双极板燃料电池短堆进行耐久性测试,累计超过2 900 h,平均单池电压衰减率约为10 mV/1000 h.

Research on high-power metal bipolar plate PEM fuel cell stack

In this paper, a thin metal bipolar-plate PEM fuel cell stack module for transportation was developed and validated. It was verified that the stack could be operated in a wide air pressure range from 110-300 kPa by air pressure compatibility test. The stack electrical power reached 27.2 kW operated at 350 A and 70 ℃ with 300 kPa pressurized air. So the mass specific power and volume specific power of the stack approached 777 W/kg and 1 015 W/L respectively. Variance analysis was adopted to evaluate the uniformity of individual cell voltages in the stack. The calculated results showed the stack had a lower cell to cell voltage variation at load current range from 50 A to 120 A. The stack electrical power operated using pure H_2 and O_2 was about 10% higher than using H_2 and air at a current of 320 A, which corresponds to the current density of 1 A/cm~2. In addition, durability test on the stack was performed for more than 2 900 h with a 4-cell short stack at a given test condition of temperature, pressure and stoichiometry by starting at 100 A. The durability test results indicated that the degradation rate was about 10 mV/1 000 h in average cell voltage.