| 摘要 |
PROBLEM TO BE SOLVED: To low and stably keep contact resistance between an electrode surface of a terminal part and an electrode terminal of battery using equipment by forming a nickel - tin alloy layer on the surface of at least the outer side of a terminal part of a negative electrode and/or a positive electrode. SOLUTION: A negative terminal plate 13 has a iron - nickel alloy layer 19 formed by heat treatment on the interface between the whole surface of a steel plate 17 acting as a base plate and a nickel plating layer 18. A tin plating layer formed on the outer surface of the nickel plating layer 18, acting as an electrode surface of the negative terminal plate 13 is converted into a nickel - tin alloy layer 14 in a heat treatment process. Tin having contact resistance lower than nickel is used in the nickel - tin alloy layer 14 on the electrode surface (outer surface) electrically connected by contact with an electrode terminal on the negative side of battery using equipment. The nickel - tin alloy layer 14 has high hardness, falling down of abrasion powder produced by rubbing of the negative terminal plate 13 with a battery using equipment terminal is decreased, and increase in contact resistance caused by oxidation of the abrasion powder can be prevented. |
