The invention relates to an absorption plate, in particular of an absorption air conditioner for a vehicle, crossed by a stream of liquid absorbent fluid (10) flowing between two exchange surfaces (35) arranged relatively opposite one another, the exofhermal absorption of a so-called coolant fluid in vapour phase taking place through said exchange surfaces (35) by increasing a concentration of the coolant fluid in the absorbent fluid (10), characterised in that the relative arrangement of the two exchange surfaces (35) forces at least one portion of the stream of absorbent fluid (10) to pass at least once through one of the exchange surfaces (35) and causes mixing of the stream of absorbent fluid (10).