Heat exchanger with built-in PTC heating element

The invention belongs to the technical field of new energy electric vehicle accessories, and particularly relates to a heat exchanger with a built-in PTC heating element. The heat exchanger is characterized in that the middle of a rectangular heat exchange plate (1) is divided into an upper cavity (1-3), a hollow cavity (1-4), and a lower cavity (1-5) by a first interval (1-1) and a second interval (1-2); a heat-conductive silicone pad (6) is arranged on the side surface of the heat exchange plate (1); the heat-conductive silicone pad (6) is pressed on a battery module (7); the PTC heating element (2) is arranged in the upper cavity (1-3) and / or the lower cavity (1-5); a lead wire (4) passes through the head of the upper cavity (1-3) and / or the lower cavity (1-5) and is connected with thePTC heating element; a flow channel cavity (5) is set in the hollow cavity (1-4); a water nozzle (3) passes through the head of the intermediate cavity (1-4) and is in communication with the flow channel cavity (5). According to the invention, the two-way heat exchange problems of low temperature rise rate of a cell, heating and cooling in a cold environment are solved by the way that the flow channel cavity is in the middle and the PTC heating element is on the upper or lower end.