Patent ID: 8968914
Filing Date: 2015-03-03
Classification: H01M,Y02E,Y02P

Abstract:
1. A prismatic sealed secondary battery comprising: a wound electrode assembly that has wound positive electrode substrate exposed portions and wound negative electrode substrate exposed portions, the wound electrode assembly having a winding axis; a positive collector member that is electrically joined to the wound positive electrode substrate exposed portions; a negative collector member that is electrically joined to the wound negative electrode substrate exposed portions; and a prismatic outer can into which the electrode assembly is inserted, the prismatic outer can including a mouth portion, a bottom, a first side surface, a second side surface, and a sealing plate, the mouth portion being sealed by the sealing plate, the first side surface being perpendicular to the bottom, the second side surface being perpendicular to the bottom, and the first side surface and the second side surface being parallel, the wound positive electrode substrate exposed portions having outermost faces and being split into two groups comprising a first group and a second group, and therebetween being disposed an intermediate member, the intermediate member including a resin material and one or more connecting conductive members each having a columnar body shape, the resin material holding the one or more connecting conductive members, one end of each connecting conductive member being connected to the first group by welding, and an opposite end of each connecting conductive member being connected to the second group by welding, the positive collector member being disposed on at least one of the outermost faces of the wound positive electrode substrate exposed portions, and being electrically joined by a welding method to the wound positive electrode substrate exposed portions; the electrode assembly being arranged so that the winding axis of the electrode assembly is parallel to the bottom, the first side surface being perpendicular to the winding axis of the electrode assembly, the second side surface being perpendicular to the winding axis of the electrode assembly, the wound positive electrode substrate exposed portions being arranged on the first side surface side, the wound negative electrode substrate exposed portions being arranged on the second side surface side, a nearest distance from the resin material to the first side surface being defined as “D1”, a nearest distance from the wound positive electrode substrate exposed portions to the first side surface being defined as “D2”; and a nearest distance from the positive collector member to the first side surface being defined as “D3”, wherein D1 is shorter than D2, and D1 is shorter than D3.