Patent ID: 9099734
Filing Date: 2015-08-04
Classification: H01M,Y02E,Y02P

Abstract:
1. A prismatic secondary battery comprising: a bottomed, hollow, prismatic outer casing that has a mouth; an electrode assembly that is housed inside the prismatic outer casing and has positive electrode plate and negative electrode plate; a positive electrode collector that is electrically connected to the positive electrode plate; a negative electrode collector that is electrically connected to the negative electrode plate; a sealing body that seals the mouth of the outer casing; at least one external terminal that is inserted into a through-hole provided in the sealing body while being electrically insulated from the sealing body with a first insulating member interposed therebetween; a conductive member that has a tubular portion; an inversion plate containing conductive material, that is deformed when the battery interior pressure exceeds a particular value; and a second insulating member that is interposed between the inversion plate and at least one of the positive electrode collector and the negative electrode collector, and in which a through-hole is formed, at least one of the positive electrode collector and the negative electrode collector being connected to the inversion plate through the through-hole formed in the second insulating member, one end of the tubular portion of the conductive member being electrically connected to the external terminal, and the other end being sealed by the inversion plate, at least one of the positive electrode collector and the negative electrode collector having a first region that is parallel to the sealing body and a second region that extends from the first region in the direction of the electrode assembly and is connected to the positive electrode plate or negative electrode plate, the first region having: a connecting portion with the inversion plate; a first opening and a second opening each of which has at least one portion located on the centerline passing through the center of the connecting portion in the direction of the long sides of the sealing body and which are formed at both sides of the connecting portion; and at least one third opening or cut-out that is formed at a position distant from the centerline, wherein the first region further has a connection forming through-hole that is formed at the center of the connecting portion, wherein a portion around the circumference of the connection forming through-hole is welded to the inversion plate, the second insulating member having projections formed at positions corresponding to each of the first opening, the second opening, and the at least one third opening or cut-out, which are formed in the first region, the first opening, the second opening, and the at least one third opening or cut-out, which are formed in the first region, each engaging with the projections formed in the second insulating member to form a first fixing portion, a second fixing portion, and a third fixing portion, respectively.