©　2018　The　Authors.　Published　by　Elsevier　Ltd.　To　accurately　describe　the　operating　mechanism　of　supercapacitor　(SC),　a　precise　model　should　be　established　for　the　SC.　In　this　paper,　an　equivalent-circuit　model　with　a　controlled　current　source　is　proposed,　which　can　simulate　the　dynamic　behavior　of　the　SC.　The　recursive　least　square　algorithm　with　forgetting　factor　is　introduced　to　identify　model　parameters.　Experimental　and　simulation　results　are　presented　to　verify　the　proposed　equivalent-circuit　model.　Results　show　a　very　good　performance　since　the　maximum　relative　modeling　error　do　not　exceed　1%.　Therefore,　the　proposed　model　with　its　parameter　identification　method　can　effectively　reveal　the　operating　mechanism　of　the　SC.