As　a　light　weight　and　high　power　density　energy,　Lithium-ion　batteries　have　become　widely　used　in　electric　vehicles,　energy　storage　systems,　etc.　Thus,　accurately　capturing　the　internal　battery　dynamics　and　properly　estimating　the　state　of　charge　of　a　lithium-ion　battery　attract　academic　research　interest.　A　reliable　battery　detection　method　is　particularly　important.　The　mechanical　properties　(elastic　modulus　and　density)　can　be　affected　by　the　level　of　lithiation　of　the　electrodes　and　the　volume　expansion　during　charge　and　discharge　cycling.　In　this　work,　a　theoretical　model　of　ultrasonic　guided　wave　detection　for　cylindrical　lithium-ion　battery　is　established　to　purchase　the　guidance　of　the　in-situ　monitoring　of　the　battery　status.　Several　numerical　cases　about　cylindrical　Lithium　cobalt　oxide　battery　are　studied,　and　the　effect　of　the　circumferential　wave　number　and　state　of　charge　(SOC)　on　the　dispersion　characteristics　are　illustrated.　Based　on　the　extracted　dispersion　curves　at　different　SOC,　the　relationship　between　the　wave　propagation　characteristics　of　the　ultrasonic　guided　waves　and　the　SOC　of　the　lithiumion　battery　is　analyzed.　The　effective　capture　of　the　mapping　relationship　between　SOC　and　acoustic　behaviors　can　provide　new　ideas　and　solutions　for　the　effective　evaluation　of　the　reliability　and　safety　of　power　batteries.　©　Published　under　licence　by　IOP　Publishing　Ltd.