Capacity　fade　and　mechanical　degradation　are　the　main　reasons　to　hinder　the　development　of　lithium-ion　batteries.　Temperature　rise　and　thermal　stress　can　lead　to　explosion　and　failure　of　LIBs　during　charge　or　discharge.　In　this　work,　in　order　to　understand　the　mechanism　of　the　temperature　rise,　the　reversible　heat　source　is　regarded　to　be　variable　with　SOC　not　constant,　and　a　full　thermo-mechanical　coupling　model　is　developed　on　basis　of　the　heat　transfer　equation　and　mechanical　equilibrium　equation.　Then　numerical　calculations　are　simulated　to　investigate　the　temperature　and　stress　distributions　of　18650　cylindrical　LIBs.　Simultaneously,　the　influences　of　the　discharge　current,　ambient　temperature　and　conductive　heat　transfer　on　the　temperature,　radial　and　hoop　stresses　are　discussed.　Finally,　the　temperature,　radial　and　hoop　stresses　are　compared　in　different　coupling　models　and　different　heat　sources,　respectively.　Numerical　results　show　that　the　variable　reversible　heat　source　is　more　reasonable,　and　the　discharge　current,　ambient　temperature　and　the　convective　heat　transfer　are　sensitive　to　the　temperature,　radial　and　hoop　stress　distributions.　In　order　to　avoid　the　temperature　rise　and　reduce　the　magnitude　of　the　stress,　one　should　decrease　the　discharge　current　or　enhance　the　conductive　heat　transfer　coefficient.