Bypass module of photovoltaic module, junction box and photovoltaic module

The invention discloses a bypass module of a photovoltaic module, a junction box and the photovoltaic module, the bypass module comprises a first conductive terminal, a second conductive terminal and a bypass element packaging module, and the bypass element packaging module comprises a bypass element; a conductor connection sheet; a package; at least one of the conductive connecting sheet, the first end part of the first conductive terminal and the second end part of the second conductive terminal is provided with a heat dissipation surface exposed from the upper surface or the lower surface of the packaging body; the bypass module further comprises a first radiator, the first radiator is provided with a connecting plate and a side plate which is bent upwards or downwards from the connecting plate, the connecting plate is arranged above or below the bypass element packaging module, the connecting plate is attached to the heat dissipation face, and the side plate is located on the side of the bypass element pa