US 2017/0373299 A1Published application

Secondary battery

AssigneeNEC Energy Devices, Ltd.

InventorsKouzou TAKEDA, Masaaki MATSUU, Hiroo TAKAHASHI, Yoshimasa YAMAMOTO, Masanori HIRAI

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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 electrode 1 and negative electrode 6 are alternately laminated while separator 20 is interposed therebetween. Positive electrode 1 and negative electrode 6 include current collectors 3, 8 and active materials 2, 7, each surface of current collectors 3, 8 is provided with an application portion and a non-application portion of active materials 2, 8, and the active materials 2, 7 include a thin portion whose thickness is small. A charging capacity ratio A/C between negative electrode 6 and positive electrode 1 that face each other at an outer edge portion containing the thin portion is greater than the charging capacity ratio A/C between negative electrode 6 and positive electrode 1 that face each other at a center side with respect to the outer edge portion.

Claims9

Dependent claims

A secondary battery including a battery electrode assembly in which a positive electrode and a negative electrode are alternately laminated while a separator is interposed therebetween, wherein

each of said positive electrode and said negative electrode includes a current collector and an active material that is applied on said current collector,
each surface of said current collector is provided with an application portion and a non-application portion, said application portion being a portion on which said active material is applied, said non-application portion being a portion on which said active material is not applied, and
said active material includes a thin portion whose thickness is small, at least at a part of an outer edge portion of said application portion, and a charging capacity ratio A/C between said negative electrode and said positive electrode that face each other at the outer edge portion containing said thin portion is higher than the charging capacity ratio A/C between said negative electrode and said positive electrode that face each other at a center side with respect to the outer edge portion, the charging capacity ratio A/C being a ratio between a charging ratio A of said negative electrode and a charging ratio C of said positive electrode.

Dependencies are inferred from the claim text.

Facts

Application: 15/543,597Filed 26 Jan 2016
Priority: JP 2015-01671030 Jan 2015
Published: 28 Dec 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification20 codes

H01M 4/02
Electrodes: electrodes composed of, or comprising, active material
H01M 4/0404
Methods of deposition of the material: by coating on electrode collectors
H01M 4/0416
Methods of deposition of the material: involving impregnation with a solution, dispersion, paste or dry powder
H01M 4/13
Electrodes composed of, or comprising, active material: electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators;…