Omron Corporation

Yoshihiro Shimizu

Takahiro Sakai

Hitoshi Yoshida

Toshio Yamashita

Hidekazu Yoshioka

A contact includes a plate with a width that ranges from 0.1 mm or more to 1 mm or less, and a stress concentrated place, where a surface roughness (Ra) on the stress concentrated place is 0.2 &#x3bc;m or less. When samples whose surface roughness Ra is 0.040 &#x3bc;m, 0.080 &#x3bc;m, 0.120 &#x3bc;m, and 0.180 &#x3bc;m were used to study a number of repetitive fracture times, as the surface roughness Ra was smaller, the number of repetitive fracture times became larger. Particularly, it is found that the surface roughness Ra may be 0.200 &#x3bc;m or less in order to satisfy 3000 times as a number of operating times of the battery connector. Further, the surface roughness Ra may be 0.080 &#x3bc;m or less in order to satisfy 6000 times as the number of operating times when a safety factor is 2.

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Moriyama, Japan

Yoshihiro Shimizu