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A connecting bus bar 12 is formed from a negative opposing section 27 which is smaller in thickness than a closed end of a bottomed cylinder 13, partially has a negative weld plate section 27a to be welded to the closed end of a bottomed cylinder 13, and opposes the closed end of the bottomed cylind

A connecting bus bar 12 is formed from a negative opposing section 27 which is smaller in thickness than a closed end of a bottomed cylinder 13, partially has a negative weld plate section 27a to be welded to the closed end of a bottomed cylinder 13, and opposes the closed end of the bottomed cylinder 13; a positive opposing section 28 which is smaller in thickness than a seal plate 14, partially has a positive weld plate section 28a to be welded to the seal plate 14, and opposes the seal plates 14; and the coupling section 29 for connecting together the negative opposing section 27 and the positive opposing section 28. The connecting bus bar 12 is formed such that the connecting bus bar 12, which excludes the negative weld plate section 27a and the positive weld plate section 28a, becomes lower in thickness than a thinner one of the closed end of the bottomed cylinder 13 and the seal plate 14.

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1. An electric-cell connecting structure for connecting a pair of electric cells (11), being disposed in series, which are welded to a closed end of the bottomed cylinder (13) of one of the electrode cells, and to the other seal plates (14) of another electric cell (11), each electric cell having a

1. An electric-cell connecting structure for connecting a pair of electric cells (11), being disposed in series, which are welded to a closed end of the bottomed cylinder (13) of one of the electrode cells, and to the other seal plates (14) of another electric cell (11), each electric cell having a bottomed cylinder (13) at a negative electrode side, and a seal plate (14) at a positive electrode side which is attached, by way of an insulating member (15), to an open end portion of the bottomed cylinder (13) so as to seal the open end of the bottomed cylinder (13), whereinsaid connecting bus bar (12) is integrally formed by a negative opposing section (27) which is smaller in plate thickness than that of the closed end of the bottomed cylinder (13) in an arrangement to be opposed each other, said negative opposing section partially including a negative weld plate section (27a) so as to be welded to the closed end of the bottomed cylinder (13); a positive opposing section (28) which is smaller in plate thickness than that of the seal plates (14) in an arrangement to be opposed each other, said positive opposing section partially including a positive weld plate section (28a) so as to be welded to the seal plate (14); and a coupling section (29) for connecting together said negative opposing section (27) and said positive opposing section (28), and further wherein the connecting bus bar (12) is formed such that a part of the connecting bus bar (12), without including said negative weld plate section (27a) and the positive weld plate section (28a), is smaller or equal in thickness than that of any one of sections of said closed end of the bottomed cylinder (13) and the seal plates (14) which has a thinner thickness thereof. 2. The electric-cell connecting structure according to claim 1, wherein said negative weld plate section (27a) and said positive weld plate section (28a) is protrusively provided with projections (32, 33) for protrusive welding purpose.3. The electric-cell connecting structure according to claim 1 or 2, wherein said coupling section (29) is formed so as to have smaller thickness in comparison of said negative opposing section (27) exclusive of said negative weld plate section (27a) and said positive opposing section (28) exclusive of said positive weld plate section (28a).4. The electric-cell connecting structure according to claim 3, wherein said coupling section (29) is formed into a substantially-U-shaped form.5. An electric-cell connecting structure for connecting together, via a connecting ring (18, 25), a pair of electric cells (11) disposed in series with each other, each electric cell having a bottomed cylinder (13) at a negative electrode side, and a seal plate (14) at a positive electrode side which is attached, by way of an insulating member (15), to an open end portion of the bottomed cylinder (13) so as to seal the open end of the bottomed cylinder (13); and the connecting ring integrally comprising a large-diameter short cylindrical section (18a, 25a) which has one cylindrically open and which is to be fitted over and welded to a surface of an outer periphery of the bottomed cylinder (13), a first flange section (18b, 25b) which extends radially inward from the other end of the large-diameter short cylindrical section (18a, 25a) and which opposes an outer surface of a closed end of the bottomed cylinder (13), a small-diameter short cylindrical section (18c, 25c) whose one end is continually connected to an inner periphery of the first flange section (18b, 25b) and which extends in the direction opposite the large-diameter short cylindrical section (18a, 25a), and a second flange section (18d, 25d) which extends radially inward from the other end of the small-diameter short cylindrical section (18c, 25c) and which is welded to seal plate (14), whereinthe connecting ring (18, 25), whose at least weld sections (18aa, 25aa) of the large-diameter short cylindrical section (18a, 25a) to be welded to the bottomed cylinder (13) are made thinner than the bottomed cylinder (13) and whose at least weld sections (18da, 25da) of the second flange section (18d, 25d) to be welded to the seal plate (14) are made thinner than the seal plate (14), is formed in such a manner that the connecting ring (18, 25), excluding said weld sections (18aa, 25aa) of the cylindrical section (18a, 25a) and the weld sections (18da, 25da) of the second flange section (18d, 25d), is greater or equal in wall thickness than or to thicker sections of said weld sections (18aa, 25aa; 18da, 25da). 6. The electric-cell connecting structure according to claim 5, wherein said weld sections (18aa, 25aa) of the cylindrical section (18a, 25a) further comprise projections (20, 27) for projection welding purpose provided protrusively.