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:
Feb. 09, 2016
Filed:
Apr. 03, 2012
Yoshiyuki Muraoka, Osaka, JP;
Masaya Ugaji, Tokushima, JP;
Takahiro Aoyama, Shizuoka, JP;
Haruya Nakai, Hyogo, JP;
Yoshiyuki Muraoka, Osaka, JP;
Masaya Ugaji, Tokushima, JP;
Takahiro Aoyama, Shizuoka, JP;
Haruya Nakai, Hyogo, JP;
Abstract
In a wound electrode group, a positive electrode includes positive electrode active material layers formed on both surfaces of a band-like positive electrode current collector, and a negative electrode includes negative electrode active material layers on both surfaces of a band-like negative electrode current collector. Charge capacity of the negative electrode falls within a range of 83-99% of theoretical capacity of the negative electrode in a full charge state of a nonaqueous electrolyte secondary battery. An active material mass M1 per unit area of a negative electrode active material layer formed on an outer circumference of the negative electrode current collector, and an active material mass M2 per unit area of a negative electrode active material layer formed on an inner circumference satisfy a relational expression of M1/M2<(R1+t/2)/(R1−t/2), where the electrode group has an innermost diameter of R1, and the negative electrode has a thickness of t.