Thermal　runaway　and　volume　expansion　caused　by　temperature　rise　under　fast　charging　of　lithium-ion　batteries　(LIBs)　are　the　major　reasons　of　battery　explosion　and　cycle　performance　degradation.　In　this　work,　considering　the　radiation　heat　transfer　on　the　battery　surface,　an　electrochemical-thermal-mechanical　coupling　model　of　cylindrical　LIBs　under　fast　charging　(state　of　charge　(SOC)　≤80%)　is　developed　in　order　to　investigate　the　distributions　of　the　temperature　and　stress.　Then,　choosing　18650　LIBs　as　the　object,　the　charge　efficiency,　temperature,　and　stress　distributions　are　compared　between　fast　charging　and　galvanostatic　operation　under　SOC≤80%,　respectively.　Finally,　the　influences　of　the　thickness,　particle　radius,　the　maximum　lithium-ion　concentration　of　the　cathode,　and　initial　electrolyte　concentration　on　the　temperature,　radial　stress,　and　hoop　stress　of　LIB　during　charge　are　explored,　respectively.　Numerical　results　show　that　fast　charging　improves　20.8%　of　the　charge　efficiency.　Increasing　the　cathodic　thickness　and　decreasing　the　cathodic　maximum　lithium-ion　concentration　or　initial　electrolyte　concentration　can　reduce　the　temperature　of　LIB　during　the　charge.　The　results　of　this　work　will　provide　some　reference　value　for　the　design　of　LIBs　under　fast　charging.　　©　2024　Yaohong　Suo　et　al.