| 摘要 |
PROBLEM TO BE SOLVED: To provide a battery connection body which stabilizes a connection state and protects single batteries. SOLUTION: The battery unit 1 has two lithium-ion secondary batteries 30a, 30b connected in series with the electric connection body 3. The electric connection body 3 is formed in a shape of a strip of paper, at nearly a center part of which in a length direction, a linear groove 5 is formed for a whole length in a width direction of the electric connection body 3. A cross section and a thickness of a part where the groove 5 is formed at the electric connection body 3 is made smaller than those of a part without the groove 5 formed. The electric connection body 3 has electric resistance larger than that of each connection member arranged between a wound-around electrode group and cathode/anode outer terminals inside each lithium-ion secondary battery 30a, 30b. The part of the electric connection body 3 where the groove 5 is formed absorbs stress added on the electric connection body 3, and exhausts more heat than each connecting member when an abnormal current flows due to outside short-circuiting. COPYRIGHT: (C)2007,JPO&INPIT |
