5OLSON J B,SEXTON E D.Operation of lead-acid batteries for HEV applications[C].USA:IEEE Ann Battery Conf,2000:205-210.
6WEST S,KREIN P T.Equalization of valve-regulated lead-acid ba-tteries:Issues and life tests[C].USA:IEEE Int.1 Telecommunications En-ergy Conf,2000:439-446.
7LOHNER A,KARDEN E,DEDONCKER R W.Charge equalizing and lifetime increasing with a new charging method for VRLA batteries[C].Australia:IEEE Int.1 Telecommunications Energy Conf,Melbourne,1997:407-411.
