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. 26, 2019
Filed:
Jan. 26, 2016
Nec Energy Devices, Ltd., Sagamihara-shi, Kanagawa, JP;
Kouzou Takeda, Kanagawa, JP;
Masaaki Matsuu, Kanagawa, JP;
Hiroo Takahashi, Kanagawa, JP;
Yoshimasa Yamamoto, Kanagawa, JP;
Masanori Hirai, Kanagawa, JP;
NEC ENERGY DEVICES, LTD., Sagamihara-shi, Kanagawa, JP;
Abstract
Provided is a secondary battery with a high electric characteristic and reliability that prevents the short circuit between a positive electrode and a negative electrode by an insulating member and that prevents or reduces the volume increase and deformation of a battery electrode assembly. A secondary battery includes a battery electrode assembly in which positive electrodeand negative electrodeare alternately laminated while separatoris interposed therebetween. Positive electrodeand negative electrodeinclude current collectorsand active materials, each surface of current collectorsis provided with an application portion and a non-application portion of active materials, and the active materialsinclude a thin portion whose thickness is small. A charging capacity ratio A/C between negative electrodeand positive electrodethat face each other at an outer edge portion containing the thin portion is greater than the charging capacity ratio A/C between negative electrodeand positive electrodethat face each other at a center side with respect to the outer edge portion.