Series/parallel mechanism built-in fuel cell

The utility model provides a fuel cell, equipped with a built-in serial-parallel structure, which comprises an anode wiring board including at least one anode current collecting wiring, at least one anode alignment and at least one anode bonding pad; a cathode wiring board including at least one cathode current collecting wiring, at least one cathode alignment and at least one cathode bonding pad; at least one membrane electrode group, which is knitted and sandwiched between the anode wiring board and the cathode wiring board and each of which is caged one-to-one between the anode current collecting wirings and the corresponding cathode current collecting wirings; and at least one U-shaped connecting terminal which is installed in between the pair, each of which is in opposition to the other, of the anode bonding pads on the anode wiring board and the cathode bonding pads on the cathode wiring board. Besides, the U-shaped connecting terminal is fastened on the paired anode bonding pads and cathode bonding pads by a direct spot welding instead of the tin solder welding.