depends on what u call percussions

if u call abssdrums, hi hats , toms snares, clap etc etc percussions (i'd rather call them drums if u feel the difference) then of course mot of techno has some. so by definition techno is percussive.

of course there are many exception to this rule (steve reich is a good quote though i hardly can call what he does techno)

if u mean by percussions the drums like congo bongo etc ... well i dont think its necessary to make a god techno track at all. example : jeff mills - the bells