Patent ID: 8980468
Filing Date: 2015-03-17
Classification: H01M,Y02E,Y02P

Abstract:
1. A prismatic secondary battery comprising: a prismatic outer casing that has a mouth; an electrode assembly that is housed inside the prismatic outer casing and has a positive electrode plate and a 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 and that has a first through-hole; at least one external terminal that is inserted into the first through-hole of 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, wherein the conductive member has an electrode assembly side end part that is closer to the electrode assembly, and an inner surface of the tubular portion of the conductive member is the inner surface of the electrode assembly side end part, an inversion plate containing conductive material, the inversion plate being 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 second through-hole is formed, at least one of the positive electrode collector and the negative electrode collector being electrically connected to the inversion plate through the second through-hole of 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 an outer edge, and the boundary portion between the first and second regions being disposed further outward than the inner surface of the tubular portion of the conductive member, and at least one of the edge portions, other than the boundary portion, being located further outward than the inner surface of the tubular portion of the conductive member.