| 摘要 |
<p>A cap assembly is provided to reduce constant resistance due to excellent welding property of cap assembly parts by welding the cap assembly parts through groove and protrusion. A cap assembly(180) includes a cap up(170). The cap up is formed with protrusion at the lower side and is formed with groove at the upper side. The cap assembly further includes PTC(positive temperature coefficient, 160), CID(current interrupt device, 150) and vent(140). The protrusion at the lower side of the cap up and the upper side of PTC are welded.</p> |
