Patent ID: 8475958
Filing Date: 2013-07-02
Classification: H01M,Y02E,Y02P

Abstract:
1. A nickel hydrogen storage battery comprising: an electrode assembly contained in a bottomed cylindrical container with the electrode assembly formed by winding spirally a strip-like negative electrode and a strip-like positive electrode with a separator interposed therebetween, the negative electrode having a mixture layer containing a hydrogen storage alloy disposed on a single core material, wherein: the negative electrode is disposed so as to occupy an outermost peripheral portion of the electrode assembly; the negative electrode has a normal portion and a thin portion, wherein the thin portion is provided at a portion corresponding to the outermost peripheral portion of the electrode assembly, the thin portion having a mixture layer thickness less than that of the normal portion of the negative electrode; the thin portion is bent in advance in a winding direction of the spirally wound electrode assembly to form an arc shape; the normal portion has a first edge and a second edge; the thin portion has a first edge and a second edge; the first edge of the thin portion is indented from the first edge of the normal portion in a thickness direction on a cross section in a longitudinal direction; the first edge of the thin portion is indented from the second edge of the normal portion in a thickness direction on a cross section in a longitudinal direction; the second edge of the thin portion is indented from the first edge of the normal portion in a thickness direction on a cross section in a longitudinal direction; the second edge of the thin portion is indented from the second edge of the normal portion in a thickness direction on a cross section in a longitudinal direction; and B/A is 0.15 or less, where A is a thickness of the thin portion and B is a deviation distance between respective center lines of the thin portion and the normal portion in a thickness direction on a cross section in a longitudinal direction.