The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 25, 2018
Filed:
Apr. 09, 2015
Nec Energy Devices, Ltd., Sagamihara-shi, Kanagawa, JP;
Ikuo Kojima, Sagamihara, JP;
Tomoyuki Ichikawa, Sagamihara, JP;
NEC ENERGY DEVICES, LTD., Sagamihara-shi, Kanagawa, JP;
Abstract
To provide a lithium ion secondary battery that is less likely affected by vibration, shock, or the like. A stacked lithium ion secondary battery is characterized in that separators, which are stacked with positive and negative electrodes, are a flat bag or flat tube with at least one side of an outer periphery thereof intermittently heat-sealed; the heat-sealed side is provided with concave and convex portions made up of straight lines or curves or a combination of straight lines and curves; the outer periphery of the separator made with the concave and convex portions is positioned outside the outer periphery of the negative electrode along with the concave and convex portions; and the outer periphery of the negative electrode is positioned outside the outer periphery of the positive electrode housed in the bag-shape or tubular separator.