Powertrain and Electric Vehicle

A powertrain is provided, including: a motor control unit () including a housing () and a first functional unit () disposed in the housing () and capable of generating heat during operation; and a heat exchanger () disposed in the housing (), where the heat exchanger () includes a first circulation channel () for a first cooling medium to circulate and a second circulation channel () for a second cooling medium to circulate. The first circulation channel () has a first external cooling surface (P), and the first circulation channel () conducts heat with the first functional unit () at the first external cooling surface (P); and/or the first circulation channel () has a second external cooling surface (P), and the first circulation channel () conducts heat with an inner surface of the housing () at the second external cooling surface (P).