| 摘要 |
PURPOSE: A safety vent of lithium ion battery is provided to prevent damage of system and safety accident and form a notch groove as a logo of manufacturing company. CONSTITUTION: A first notch groove(120) is formed at a first portion. The first notch groove(120) has predetermined depth in a horizontal and a vertical direction. A second notch groove(140) is formed at a second portion. The second notch groove(140) has a predetermined depth in an opposite direction of the first notch groove(120). A logo is formed on a bottom face of a battery case(110). The logo has a safety vent(160) connected through the first and the second notch groove(120,140).
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