Plate heat exchanger comprising: - a plurality of modules formed of two metal plates (10,20), each plate (10,20) comprising a peripheral zone (19,29), at least one inlet chimney (11,21), at least one outlet chimney (12,22), a crenellated inner zone comprising ridges (13,23) and troughs (14,24) and at least two distribution zones located on the one hand between each inlet chimney (11,21) and said crenellated inner zone and on the other hand between each outlet chimney (12,22) and said crenellated inner zone, each distribution zone comprising channels between said crenellated inner zone and each inlet chimney (11,21) or each outlet chimney (12,22), two plates (10,20) constituting a module being in contact on the one hand at said peripheral zones (19,29) and on the other hand at the points of contact of said troughs (14,24), at least one inlet pipe being formed by said inlet chimneys (11,21) of each plate (10,20) and at least one outlet pipe being formed by said outlet chimneys (12,22) of each plate (10,20), said modules being stacked in such a manner that two adjacent modules are in contact at least at said inlet chimneys (11,21) and at said outlet chimneys (12,22), the directions of said troughs (14,24) and of said ridges (13,23) of each plate (10,20) forming a first angle β with the flow direction of the fluids flowing in said exchanger and the directions of said troughs (14,24) and of said ridges (13,23) of two adjacent plates (10,20) forming a non-zero second angle θ between them, - a casing provided with walls within which said modules are housed, an inlet and an outlet of said exchanger being arranged in said casing, - a first cavity constituted by the inside space of each module, a first fluid being capable of flowing in said first cavities between each inlet pipe and each outlet pipe, - a second cavity constituted by the space between two adjacent modules and by the space between each extreme module and a wall of said casing, a second fluid being capable of flowing in said second cavities between an inlet and an outlet of said exchanger, and - a third cavity constituted by the space situated between said peripheral zones (19,29) of said modules and said walls, characterised in that on the one hand said channels are parallel to said flow direction of said first fluid for a first portion of said distribution zone and on the other hand, for a second portion of said distribution zone, said channels are inclined relative to said flow direction of said first fluid in the proximity of said inlet chimney (11,21) or outlet chimney (12,22) and parallel to said flow direction of said first fluid in the proximity of said crenellated inner zone in order to make the filling and the discharge of said modules by said first fluid uniform, said first portion of said distribution zone being constituted by the space situated between said inlet chimney (11,21) or outlet chimney (12,22) and said crenellated inner zone in said flow direction of said first fluid, said second portion of said distribution zone being constituted by the remainder of said distribution zone outside said first portion. - a plurality of modules formed of two metal plates (10,20), each plate (10,20) comprising a peripheral zone (19,29), at least one inlet chimney (11,21), at least one outlet chimney (12,22), a crenellated inner zone comprising ridges (13,23) and troughs (14,24) and at least two distribution zones located on the one hand between each inlet chimney (11,21) and said crenellated inner zone and on the other hand between each outlet chimney (12,22) and said crenellated inner zone, each distribution zone comprising channels between said crenellated inner zone and each inlet chimney (11,21) or each outlet chimney (12,22), two plates (10,20) constituting a module being in contact on the one hand at said peripheral zones (19,29) and on the other hand at the points of contact of said troughs (14,24), at least one inlet pipe being formed by said inlet chimneys (11,21) of each plate (10,20) and at least one outlet pipe being formed by said outlet chimneys (12,22) of each plate (10,20), said modules being stacked in such a manner that two adjacent modules are in contact at least at said inlet chimneys (11,21) and at said outlet chimneys (12,22), the directions of said troughs (14,24) and of said ridges (13,23) of each plate (10,20) forming a first angle β with the flow direction of the fluids flowing in said exchanger and the directions of said troughs (14,24) and of said ridges (13,23) of two adjacent plates (10,20) forming a non-zero second angle θ between them, - a casing provided with walls within which said modules are housed, an inlet and an outlet of said exchanger being arranged in said casing, - a first cavity constituted by the inside space of each module, a first fluid being capable of flowing in said first cavities between each inlet pipe and each outlet pipe, - a second cavity constituted by the space between two adjacent modules and by the space between each extreme module and a wall of said casing, a second fluid being capable of flowing in said second cavities between an inlet and an outlet of said exchanger, and - a third cavity constituted by the space situated between said peripheral zones (19,29) of said modules and said walls,