Patent ID: 8986869
Filing Date: 2015-03-24
Classification: H01M,Y02E,Y02P,Y10T

Abstract:
1. A secondary battery comprising: a wound electrode group configured by winding a positive electrode plate and a negative electrode plate through a separator on an outer circumferential portion of a shaft core; a vessel which accommodates the wound electrode group, has an inside sealed with a lid, and is provided with a positive electrode external terminal and a negative electrode external terminal on an external surface; a positive electrode collector that electrically connects the positive electrode plate to the positive electrode external terminal; a negative electrode collector that electrically connects the negative electrode plate to the negative electrode external terminal; a positive electrode splaying portion and a negative electrode splaying portion that press and splay a laminate of the positive electrode plate and a laminate of the negative electrode plate from inside at both end surfaces of the wound electrode group, wherein the shaft core includes a positive electrode shaft core portion provided with the positive electrode splaying portion at one end, a negative electrode shaft core portion provided with the negative electrode splaying portion at the other end, and an insulation portion that mutually insulates and integrates the positive electrode shaft core portion and the negative electrode shaft core portion, the positive electrode plate is electrically connected to the positive electrode collector in a state of being splayed through the positive electrode splaying portion, and the negative electrode plate is electrically connected to the negative electrode collector in a state of being splayed through the negative electrode splaying portion.