| 摘要 |
The present invention provides an assembled battery which can improve output density. The assembled batter is configured by connecting four unit cells in series. The unit cells are disposed in parallel such that their polarities are alternate. Unit cells adjacent to each other are connected by a connection member 40. The connection member 40 is composed of a stacked metal plate obtained by stacking two metal plates 40 a and 40 b. Copper and nickel producing binary alloy by welding are used for the metal plates 40 a and 40 b, respectively. Since a volume resistance of copper is about ¼ of that of nickel, a ratio of volume resistances of metals used for the metal plates 40 a and 40 b, respectively, becomes ½ or less. Both end portions of the connection member 40 are joined to a positive electrode external terminal of one of the adjacent unit cells and a negative electrode external terminal of the other by resistance welding, respectively. Copper and nickel used for the metal plates 40 a and 40 b are alloyed by resistance welding.
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