Prismatic secondary battery

摘要

In a prismatic secondary battery, an internal negative electrode terminal is electrically connected to a collector through through-holes formed in a sealing plate, a gasket, and an insulating member in a manner electrically insulated from the sealing plate. The sealing plate has one face on which a protrusion is formed, an insulating plate has a face that is on the sealing plate and on which a concave portion fitted to the protrusion is formed, each of the protrusion and the concave portion of the insulating plate is provided at one position on respective sides of the through-hole, and at least one of the protrusions has a top face on which a concave portion is formed. The battery having such a structure is unlikely to cause rotary displacement between the insulating plate and the sealing plate even when a rotary torque is applied to the internal terminal.

主权项

1. A prismatic secondary battery comprising:
a prismatic hollow outer body having a mouth portion and a bottom; a sealing plate sealing up the mouth portion; an electrode assembly being stored in the prismatic hollow outer body; and an internal terminal being electrically connected to the electrode assembly, a first insulating member being disposed on a first face of the sealing plate, a second insulating member being disposed on a second face of the sealing plate, the first insulating member including a conductive member having a bolt standing on an opposite face to the sealing plate, each of the sealing plate, the first insulating member, and the second insulating member having a through-hole, the internal terminal being electrically connected to the conductive member through the through-holes formed in the sealing plate, the first insulating member, and the second insulating member in a manner electrically insulated from the sealing plate, a protrusion being formed on the first face of the sealing plate, a first concave portion being formed on a face of the first insulating member closer to the sealing plate and being fitted to the protrusion; and a concave portion being formed on a top face of the protrusion, wherein an annular concave portion is formed around at the protrusion;wherein
in a direction perpendicular to the sealing plate, an undersurface of the concave portion formed on the top face of the protrusion exists at a position higher than an undersurface of the annular concave portion formed around at the protrusion.