This would be a very unfair fight, it would be ridiculous to see Batman die so easily, haha.
Ironman has an armor that gives him super strength, flight power and a level of protection, which makes it almost invulnerable. The armor also contains a huge range of repulsor rays, missile launchers... Only one of these commands and goodbye Batman.
Not to mention the extended reflexes and healing factor.
Batman is just a normal human who doesn't have any "superhuman" abilities, only skills: is a unique, skilled athlete in all forms of hand-to-hand and weapons fights, the world's greatest detective, master of leakage, disguises and explosives, inventor, scientist, acrobatics, riding, driving cars, etc. But I believe that none of these "skills" are able to leave it at an advantage in a fight like that.
Undoubtedly, Ironman wins.