THIN LITHIUM SECONDARY BATTERY

• Main Authors: SENO YASUNORI, OYAMA MASAMICHI, ORIHARA MASANAO, KOZAI YUKIO
• Format: Patent
• Language: English
• Published: 19.01.2012
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

PROBLEM TO BE SOLVED: To provide a thin lithium secondary battery with adhesiveness, sealability, and short circuit preventive property equivalent to a case where a TAB tape is used, without using the TAB tape.SOLUTION: A sealant layer 103 of an exterior material of the lithium secondary battery is made into three-layer structure where an outside acid modified polypropylene layer 103a/polypropylene layer 103b/inside acid modified polypropylene layer 103a' are laminated. When a thickness of the outside acid modified polypropylene layer 103a before thermal fusion bonding is considered to be α μm, thickness of the polypropylene layer 103b is considered to be μm, thickness of the inside acid modified polypropylene layer 103a' is considered to be γ μm, and thickness of the thicker one of a positive pole terminal 15 and a negative pole terminal is considered to be T μm, relations 2T/3≤α+ +γ≤3T/2, 8≤α≤20, and 10≤γ≤25 are satisfied.