Stacked plate heat exchanger

A stacked plate heat exchanger for a motor vehicle, comprising:

• a plurality of elongated stacked plates extending in a longitudinal direction and stacked against one another perpendicularly to the longitudinal direction in a stacking direction;
• a plurality of first hollow spaces and a plurality of second hollow spaces disposed between adjacent stacked plates that are closed off towards the outside, through which alternatingly a first medium and a second medium flows,
• the plurality of first hollow spaces fluidically connected to two first medium passages located opposite one another in the longitudinal direction and the plurality of second hollow spaces fluidically connected to two medium passages located opposite one another in the longitudinal direction,
• wherein the plurality of stacked plates respectively have a rib structure including a plurality of ribs disposed on a respective plate surface, structured and arranged to provide a plurality of flow passages within the respective hollow space,
• the rib structure having a guiding region and two distribution regions, wherein the two distribution regions and the guiding region extend transversely to the longitudinal direction and are arranged next to one another in the longitudinal direction,
• the first medium passages and the second medium passages are each disposed within one of the two distribution regions, and
• wherein the rib structure differs in the guiding region and in the two distribution regions by shape and size of the plurality of flow passages, wherein the plurality of flow passages are flowed through by the respective medium in the two distribution regions transversely to the longitudinal direction and in the guiding region in the longitudinal direction.