SQUARE LITHIUM-ION SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a square lithium-ion secondary battery with improved liquid injection function to reduce liquid flooding.

SOLUTION: A frame 1 is composed of an oval bottom plate 2 and an outer wall 3 vertical to the bottom plate 2 formed on the outer periphery face of the bottom plate 2. A liquid passing hole 4c is formed at every four corners of the bottom plate 2 so as to contact with the outer wall 3. A reinforcing separation wall 7, crossing the frame 1 and communicating with the outer wall 3, is arranged to the frame 1. A notch 8 is formed at the separation wall 7.

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