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:
Jul. 09, 2013
Filed:
Dec. 10, 2008
Yoshihiko Ohashi, Tokyo, JP;
Mitsuo Kougo, Tokyo, JP;
Kiyonori Hinoki, Tokyo, JP;
Kazuo Katai, Tokyo, JP;
Yoshihiko Ohashi, Tokyo, JP;
Mitsuo Kougo, Tokyo, JP;
Kiyonori Hinoki, Tokyo, JP;
Kazuo Katai, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
A wound electrochemical device has a wound body formed by winding a multilayer member including a multilayer structure composed of a positive electrode, a separator, and a negative electrode; wherein each of the positive and negative electrodes, includes a structure having an active material layer formed on both sides of a current collector; wherein the wound body has a space at a center portion thereof; and wherein the smallest radius of curvature R of a curved part in an innermost circumferential portion of the wound body satisfies the following expression (1):=α×(2)  (1)where R is the smallest radius of curvature of the curved part in the innermost circumferential portion of the wound body (unit: μm), α is a value within the range of 3.33 to 7.12, Tis a thickness of the current collector of the electrode positioned at the innermost circumference of the wound body (unit: μm), and Tis a thickness of the active material layer of the electrode positioned at the innermost circumference of the wound body (unit: μm), Tbeing a value within the range of 8 to 30 (unit: μm).