Patent ID: 8574753
Filing Date: 2013-11-05
Classification: H01M,Y02E,Y02P

Abstract:
1. A battery comprising: an electrode group in which a positive electrode and a negative electrode are wound into a flat form with a separator interposed therebetween, the positive electrode comprising a positive electrode current collector, and the negative electrode comprising a negative electrode current collector; a positive electrode tab which is a section of the positive electrode current collector projected into a spiral form from one end face of the electrode group; a negative electrode tab which is a section of the negative electrode current collector projected into a spiral form from the other end face of the electrode group; a conductive positive electrode nipping member comprising first and second nipping sections and a linking section which connects the first and second nipping sections electrically to each other, the first and second nipping sections dividing the positive electrode tab into two bundles in which portions of the tab are laminated onto each other in a thickness direction of the electrode group, the first nipping section nipping one of the two bundles, and the second nipping section nipping the other of the two bundles; a conductive negative electrode nipping member comprising first and second nipping sections and a linking section which connects the first and second nipping sections electrically to each other, the first and second nipping sections dividing the negative electrode tab into two bundles in which portions of the tab are laminated onto each other in the thickness direction of the electrode group, the first nipping section nipping one of the two bundles, and the second nipping section nipping the other of the two bundles; a case in which the electrode group is stored; a lid provided to an opening in the case, and comprising a positive electrode terminal and a negative electrode terminal; a positive electrode lead comprising a connecting section connected electrically to the positive electrode terminal, and current collecting sections which are two sections branched from the connecting section and sandwiching the positive electrode nipping member, one of the two sections being connected electrically to the first nipping section of the positive electrode nipping member, the other being connected electrically to the second nipping section; and a negative electrode lead comprising a connecting section connected electrically to the negative electrode terminal, and current collecting sections which are two sections branched from the connecting section and sandwiching the negative electrode nipping member, one of the two sections being connected electrically to the first nipping section of the negative electrode nipping member, the other being connected electrically to the second nipping section.