Heat exchanger and heat exchange system

A heat exchanger, comprising:

• a first collecting pipe, a heat exchange tube and a partition plate;
• the first collecting pipe comprising a pipe wall and a first inner cavity;
• the first collecting pipe comprising a first end portion and a second end portion in a length direction thereof;
• the partition plate being disposed in the first inner cavity and extending from the first end portion along the length direction of the first collecting pipe so as to divide the first inner cavity into a first sub-cavity and a second sub-cavity, the first sub-cavity and the second sub-cavity being parallel in the length direction of the first collecting pipe;
• the heat exchange tube comprising a tube wall and a refrigerant channel for refrigerant to flow, the heat exchange tube having a first end and a second end in an extending direction thereof, the refrigerant channel extending from the first end to the second end and extending through the heat exchange tube;
• the pipe wall of the first collecting pipe further defining a first insertion hole, the partition plate defining a second insertion hole corresponding to the first insertion hole, the first end of the heat exchange tube passing through the first insertion hole and being inserted into the second insertion hole;
• the partition plate defining a through hole, the through hole and the second insertion hole being disposed in a staggered manner, the through hole being in communication with the first sub-cavity and the second sub-cavity;
• the heat exchanger further comprising a first inlet/outlet, the first inlet/outlet being disposed at the first end portion of the first collecting pipe and being in communication with the second sub-cavity, the first sub-cavity being in communication with the refrigerant channel.