Patent ID: 7883795
Filing Date: 2011-02-08
Classification: H01M,Y02E,Y02P

Abstract:
1. A hexahedral secondary battery comprising: an electrode assembly including a positive electrode and a negative electrode, and a separator interposed therebetween, the positive and negative electrodes each having an uncoated region without active material along an edge thereof, the positive and negative electrodes being spiral wound with the edge of the uncoated region of each electrode forming an end surface; a container receiving the electrode assembly; a cap assembly fixed to the container to seal the container; a lead element contacting the entire end surface of one of the uncoated regions; and a first tab extended from the lead element, wherein the lead element comprises at least two lead plates that are connected to each other by the first tab, each lead plate having a long side edge extending along its length, wherein the two lead plates physically contact each other along their respective long side edges, wherein the first tab extends from the long side edges of the lead plates, wherein the first tab has a first portion and a second portion, the second portion extending past an end of the lead element and is electrically connected to a positive terminal of the cap assembly, wherein the lead element is a positive lead element combined with the uncoated region of the positive electrode, and the positive lead element is electrically connected to the positive terminal of the cap assembly, through the second portion of the first tab electrically connecting the first portion of the first tab to the positive terminal, and wherein the lead element is integrally formed with the first tab.