LAMINATED NONAQUEOUS SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a laminated nonaqueous secondary battery retaining high reliability over a long period of time even under a special environment such as a high temperature environment. SOLUTION: The laminated type nonaqueous secondary battery has a group of electrodes which are composed by laminating a positive electrode sheet and a negative electrode sheet with a separator therebetween stored in a rectangular laminate sheet battery package and is weld shielded in three sides or four sides of the laminate sheet battery package in a state with a positive electrode terminal connected to the positive sheet and a negative electrode terminal connected to the negative sheet projecting outside. The problem is solved by the laminated nonaqueous secondary battery in which heat resistant material is arranged in a boundary portion between a welded part and a non-welded part in at least one part of a corner part where weld shielded sides intersect in an inner side of the battery of the laminate sheet on a top side of the electrode group and/or the laminate sheet below the electrode group. COPYRIGHT: (C)2008,JPO&INPIT