Heat exchanger and brayton cycle system based on solution to pinch point in thermodynamic cycle

A heat exchanger based on a solution to a pinch point in a thermodynamic cycle, comprising:

• a heat exchange core, wherein the heat exchange core comprises a plurality of cold side heat exchange plates and a plurality of hot side heat exchange plates stacked alternately;
• a first surface of each cold side heat exchange plate defines a plurality of first flow channels by first partitions;
• a second surface, which faces the same direction as the first surface, of each hot side heat exchange plate defines a plurality of second flow channels by second partitions;
• the cold side heat exchange plates and/or the hot side heat exchange plates further comprise branch flow channels;
• the branch flow channels are disposed along flow paths of all the first flow channels and/or all the second flow channels, and are in fluid communication with all the first flow channels and/or all the second flow channels, to converge or split flows within the cold side heat exchange plates and/or the hot side heat exchange plates;
• and
• a cover plate, configured to seal the heat exchange core.