Abstract: Athreedimensionalnumericalmodelofanindividualpressurevesselwasdevelopedbasedonthe80AhnickelhydrogenbatteryusedforGEOcommunicationsatellites.Themodel,includingthemaincomponentsofabatteryincludingthebatteryshellandelectrodestack,wasutilizedtosimulatethetransientflowfieldoftheelectrolyteunderzerogravitycondition,byusingthecomputationalfluiddynamics(CFD)technology.Thecomparisonsofthesimulationresultswithdifferentboundaryconditionsshowthattheflowvelocityoftheelectrolytefromshelltotheelectrodestackwasdecidedbythewettabilityoftheelectrolyte.Addingroutesfortheelectrolyteflowingfromthebottomacmeandtheupperacmetotheelectrodestackcanimprovetheperformanceofthenickelhydrogenbattery.

Key words: Nickelhydrogenbattery;Electrolyte, Contactangle, Computationalfluiddynamics;Satellite