| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-reliability secondary battery module capable of preventing a situation where the battery module cleaves even when a voltage is raised by overcharge and internal pressure of a battery rises. SOLUTION: In this battery module 10, a central attachment part 124 for isolating unit cells from each other is formed to reduce width of the attachment part (junction part) and adhesion force (junction strength) thereof as compared with those of peripheral attachment parts 123 for isolating the unit cells from the outside. When the battery is overcharged, the voltage thereof rises and gas is generated by heat generation to increase internal pressure, the central attachment part 124 small in adhesion force (junction strength) is separated earlier than the peripheral attachment parts 123, and an isolation state between a first space 125 and a second space 126 is interrupted. As a result, electrolytes of the first and second unit cells 100<SB>-1</SB>and 100<SB>-2</SB>are mixed, the respective voltages of the first and second unit cells 100<SB>-1</SB>and 100<SB>-2</SB>drop, and the overcharge state is eliminated to restrain heat generation. Thereby, the peripheral attachment parts 123 are broken, whereby the battery module 10 can be prevented from cleaving. COPYRIGHT: (C)2007,JPO&INPIT
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