Power supply apparatus and vehicle

A power supply apparatus that exchanges an electric power with an electric machine, comprising:

• a direct-current power supply;
• a first relay device that electrically selectively connects the direct-current power supply to the electric machine;
• a smoothing capacitor that is connected in parallel with the direct-current power supply and provided between the first relay device and the electric machine;
• and
• a second relay device that is connected to the direct-current power supply in parallel with the smoothing capacitor on the electric machine side with respect to the first relay device and that selectively connects the smoothing capacitor,
• wherein the first relay device and the second relay device are mechanically integrally formed such that the second relay device is electrically connected when the direct-current power supply and the electric machine are disconnected from each other by the first relay device, wherein
• the first relay device has a first contact member that electrically selectively connects a first terminal of the direct-current power supply to a bus connected to the electric machine,
• the second relay device has a second contact member that electrically selectively connects a second terminal of the direct-current power supply to the bus,
• the first contact member is connected to the second contact member via a coupling portion, and
• the second contact member comes into contact with the second terminal and the bus when the first contact member is separated from the first terminal and the bus, or
• the first relay device has a first contact member that electrically selectively connects a first terminal of the direct-current power supply to a bus connected to the electric machine,
• the second relay device has a second contact member that electrically selectively connects a second terminal of the direct-current power supply to the bus,
• the second contact member includes a crank portion that extends toward the first contact member,
• the second contact member is separated from the second terminal and the bus by the crank portion when the first contact member comes into contact with the first terminal and the bus, and
• the second contact member comes into contact with the second terminal and the bus when the first contact member is separated from the first terminal and the bus.