Powertrain for electric vehicle

A powertrain for an electric vehicle, the powertrain comprising:

• a planetary gear including a first rotating element, a second rotating element and a third rotating element, where the first rotating element is connected to a first shaft, the second rotating element is connected to a second shaft, and the third rotating element is selectively connected to a transmission housing;
• a first motor configured to supply power to the first shaft at all times;
• and
• a second motor configured to selectively supply power to the first shaft and the second shaft,
• wherein two rotating elements among the first, second, third rotating elements of the planetary gear are selectively connected to integrally rotate the entire planetary gear,
• wherein:
• a seventh gear is connected to the first shaft in a restrained state;
• an eighth gear is connected to the second shaft in a restrained state;
• a ninth gear in external engagement with the seventh gear and a tenth gear in external engagement with the eighth gear are installed coaxially with each other;
• and
• the second motor is installed to be connectable to the first shaft and the second shaft via a second shift assembly installed between the ninth gear and the tenth gear.