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1. A fuse unit used for a charging circuit in a vehicle for charging a first battery having a battery post, and a second battery mounted on the vehicle with electricity generated by a generator through driving of the vehicle, the fuse unit comprising:
an insulating unit main body; a conductive circuit body integrally buried in the unit main body, the circuit body including,
a first battery connecting end connected to the first battery,an alternator connecting end connected to the generator, anda second battery connecting end connected to the second battery; and a fusible body, connected to the circuit body, for blocking a current flow path when an overcurrent flows therethrough, the fusible body including,
a first fusible portion formed between the first battery connecting end and the alternator connecting end,a second fusible portion formed between the alternator connecting end and the second battery connecting end, anda third fusible portion formed between the alternator connecting end and an electrical component installed in the vehicle, wherein the first battery connecting end is provided with an insertion hole into which a connecting bolt attached to a battery terminal connected to the battery post of the first battery and projecting from an upper surface of the first battery, is inserted, the alternator connecting end is provided with an alternator connecting bolt buried in the unit main body and extending in a direction identical with that in which the battery terminal extends, the second battery connecting end is provided with a second battery connecting bolt buried in the unit main body and extending in a direction identical with that in which the alternator connecting bolt extends, and the alternator connecting bolt to be electrically connected to a terminal of an alternator wire has a diameter different from that of the second battery connecting bolt to be electrically connected to a terminal of a second battery wire, wherein the alternator connecting end comprise an integrated plate-like load-side terminal portion bent substantially at a right angle and hanging from an alternator terminal portion, the second battery connecting end comprises an integrated plate-like connecting terminal portion bent substantially at a right angle and hanging from a second battery terminal portion, the load-side terminal portion of the alternator connecting end and the connecting terminal portion of the second battery connecting end are provided with a second battery-side terminal portion and an alternator-side terminal portion, respectively, extending in a direction coming closer together, the second battery-side terminal portion and the alternator-side terminal portion are connected together via the second fusible portion, and the second battery connecting end is connected to the generator via the alternator connecting end such that the second battery connected with the second battery connecting end is charged by the generator and the second fusible portion protects the circuit body from an overcurrent through the second battery. |
