摘要：蓄電池作為電源系統(tǒng)停電時(shí)的備用電源，已廣泛的應(yīng)用于工業(yè)生產(chǎn)、交通、通信等行業(yè)。蓄電池狀態(tài)的重要標(biāo)志之一就是它的內(nèi)阻。因此實(shí)現(xiàn)蓄電池內(nèi)阻的在線實(shí)時(shí)監(jiān)測(cè),將有重要的實(shí)際意義。本文提出了基于鑒相處理技術(shù)的方法，介紹了該測(cè)量方法的原理，同時(shí)提供了檢測(cè)蓄電池的交流恒流源的設(shè)計(jì)思想。 敘詞：交流恒流源，蓄電池，內(nèi)阻 Abstract：The battery is standby power supply when the power source system cut , and it widely applies to the profession of industrial production, traffic, communication and so on. Battery impedance is one of its important sign. So it has the important practical significance to realize the battery impedance on-line and real-time measurement. This article has presented a method to measure battery impedance based on phase detector processing technology and the theory of this measurement method. Simultaneously it has presented a thought of designing AC constant current source to apply to measure battery impedance. Keyword：AC constant current source battery impedance