Patent ID: 8206847

Claim:
A battery pack comprising: a first battery and a second battery, each of which comprises a battery casing and a sealing plate that closes an aperture of the battery casing, the first battery and the second battery being placed in a linear relationship with each other; and a connector made of a metallic plate, the connector being disposed between the first battery and the second battery so as to couple the first battery to the second battery via the connector, with the connector being welded to the sealing plate of the first battery and to the battery casing of the second battery, so that the adjoining first battery and second battery are linearly disposed to be connected in series; wherein the connector, being made of the metallic plate, is in a form of a tube with a bottom, being composed of a bottom portion and a side wall; wherein, in regard to the bottom portion of the connector, an outer periphery is welded to a bottom wall of the battery casing of the second battery, while an inner periphery at an interior side of the outer periphery is welded to the sealing plate of the first battery; wherein the side wall of the connector, being protruded toward the first battery, has an inner diameter larger than an outer diameter at an end portion of the first battery, so that the first battery is inserted inside the side wall in a non-contact state; and wherein the end portion of the first battery is inserted inside the side wall of the connector in a non-contact state, with the bottom portion being welded to the first battery and the second battery, so that the first battery is coupled to the second battery by the connector.