| 摘要 |
<P>PROBLEM TO BE SOLVED: To induce short circuit when a negative electrode tab comes in contact with a metallic layer of a case by breakage of an inner skin layer since the same positive electrode potential is applied to a metallic thin plate of the case and a positive electrode tab, easily detect the variation in the open-circuit voltage, and thereby easily screen the presence or absence of the defect of a battery. <P>SOLUTION: A pouch type lithium secondary battery 30 is equipped with a battery part 31 having a positive electrode plate comprising a positive electrode current collector and a positive electrode active material layer formed on at least one side of the positive electrode current collector, a negative plate comprising a negative electrode current collector and a negative electrode active material layer formed on at least one side of the negative electrode current collector, and a separator arranged between the positive electrode plate and the negative electrode plate and insulating them each other; and a case 310 providing a space part 331 for housing a positive electrode tab 35 electrically connected to the positive current collector, a negative electrode tab 37 electrically connected to the negative electrode current collector, and the battery part 31, forming sealed surfaces 322, 332 heat-sealed along the end edge of the space part 331. The same positive electrode potential is applied to the positive electrode tab 35 and the case 310 by electrically connected structure. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
