BATTERY AND METHOD OF MANUFACTURING BATTERY

摘要

It is a task of the invention to provide a battery that allows a gas produced inside a flat wound electrode body to be easily discharged to the outside of the electrode body, and restrains an electrolytic solution (a retained electrolytic solution) extruded from the flat wound electrode body through charge/discharge from directly flowing out to the outside of the flat wound electrode body, and a method of manufacturing this battery. The battery is equipped with a flat wound electrode body, a collector member, and a retained electrolytic solution. The flat wound electrode body has an active material layer wound portion that is obtained by winding an electrode plate, has a flat oval cross-section, and has a wound active material layer forming portion, and an exposed wound portion that has a wound foil exposed portion. An exposed wound central portion is detached from at least one of two exposed wound end portions while maintaining contact with an active material layer wound portion that is adjacent to the exposed wound central portion in an axial direction. The collector member is joined to the exposed wound central portion.

主权项

1. A battery comprising:
a flat wound electrode body that is obtained by winding an electrode plate around a winding axis, the electrode plate including a band-shaped active material layer forming portion that is obtained by forming an active material layer on a band-shaped metal foil along a first end edge as one of two end edges extending in a longitudinal direction of the metal foil, and a band-shaped foil exposed portion that has the metal foil exposed along a second end edge as the other of the two end edges of the metal foil, that has a flat oval cross-section, and that has an active material layer wound portion that is obtained by winding the active material layer forming portion, and an exposed wound portion that is located on one side in an axial direction along the winding axis with respect to the active material layer wound portion and has the foil exposed portion that is wound; a collector member that is made of a metal, and is joined to the exposed wound portion of the flat wound electrode body; and a retained electrolytic solution that is retained by the active material layer wound portion of the flat wound electrode body, wherein when regions of the exposed wound portion that are located at both end portions of the oval cross-section in a major axis direction respectively and are obtained by bending back the foil exposed portion into a shape of R are defined as R-shaped exposed wound portions, regions of the exposed wound portion that include the R-shaped exposed wound portions are defined as exposed wound end portions, and a region of the exposed wound portion that is located in a central region in the major axis direction and is sandwiched between the exposed wound end portions is defined as an exposed wound central portion, the exposed wound central portion is detached from at least one of the two exposed wound end portions, while maintaining contact with the active material layer wound portion that is adjacent to the exposed wound central portion in the axial direction, and the collector member is joined to the exposed wound central portion.