Patent ID: 7785738
Filing Date: 2010-08-31
Classification: H01G,H01M,Y02E,Y02P,Y10T

Abstract:
1. A lithium-ion secondary battery comprising: electrode bodies each having positive and negative electrodes laminated with a separator interposed therebetween; an outer package accommodating a multilayer body formed by laminating at least two of the electrode bodies; planar leads respectively connected to the positive and negative electrodes of each of the electrode bodies, the planar leads extending from the multilayer body to the outside of the outer package; and a sealing member in close contact with surroundings of the leads and held by an opening part of the outer package so as to seal the opening part; wherein the at least two electrode bodies are laminated such as to yield portions where only one of the planar leads of a first electrode body overlaps one of the planar leads of a second electrode body in the laminating direction of the electrode bodies in the opening part; and wherein the lithium-ion secondary battery has a portion where a thickness of the sealing member from a surface of the outer package to a surface of one of the planar leads in the laminating direction of the electrode bodies on one side of the one planar lead differs from that on the other side of the one planar lead such that the one planar lead and another of the planar leads respectively connected to the positive and negative electrodes of one of the electrode bodies are arranged within the same plane perpendicular to the laminating direction of the electrode bodies.