The　electrolyte　volume　fraction　in　agglomerate　and　the　agglomerate　radius　in　the　cathode　catalyst　layer　of　a　proton　exchange　membrane　fuel　cell　affect　the　oxygen　transport　resistance,　which　affects　the　electrochemical　reaction　rate,　as　well　as　the　heat　generation　and　transfer　in　the　fuel　cell.　However,　the　effects　of　electrolyte　volume　fraction　and　agglomerate　radius　on　heat　transfer　in　a　fuel　cell　are　not　clear.　Therefore,　in　this　paper,　a　two-dimensional,　two-phase,　non-isothermal　proton　exchange　membrane　fuel　cell　agglomerate　model　is　established　to　investigate　the　effects　of　electrolyte　volume　fraction　and　agglomerate　radius　on　temperature　distribution　and　heat　production　in　a　fuel　cell.　Results　show　that　the　increase　of　electrolyte　volume　fraction　and　the　decrease　of　agglomerate　radius　are　beneficial　to　the　decrease　of　the　oxygen　transport　resistance,　the　improvement　of　cell　performance,　the　increase　of　the　heat　production　of　each　part　of　the　membrane　electrode　assembly,　and　the　increase　of　the　heat　production　of　oxygen　reduction　reaction,　ohmic　heat　production　and　the　heat　production　of　phase　change　of　water　in　the　cathode　catalyst　layer,　while　they　are　not　conducive　to　the　uniform　distribution　of　temperature.　©　2022,　Chinese　Academy　of　Mechanics.　All　rights　reserved.