NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

WIPO Patent Application WO/2018/155248

A1

The objective of the present invention is to prevent a negative electrode in a bent section of a flat-shaped wound electrode body from over-charging locally, and prevent a positive electrode core body in the bent section from cracking. The non-aqueous electrolyte secondary battery according to one mode of the present invention comprises: a flat-shaped electrode body in which a wound pole plate group having a positive electrode plate, a negative electrode plate, and a separator interposed therebetween; a non-aqueous electrolyte; and an exterior body. The positive electrode plate has a positive electrode core body and a positive electrode mixture layer formed on the surface thereof. The negative electrode plate has a negative electrode core body and a negative electrode mixture layer formed on the surface thereof. In a cross section orthogonal to the winding axis, at each of the end portions in the major axis direction, the electrode body has a bent section wherein the pole plate group is bent. Among the surfaces on the winding inner side of the positive electrode mixture layer within each of the bent sections, a resin tape is adhered in a section of the positive electrode plate disposed most toward the beginning of the winding. The resin tape contains an adhesive layer, and a base material layer that does not transmit lithium ions. The adhesive force of the resin tape with respect to the positive electrode mixture layer is between 0.1 N/cm and 2 N/cm inclusive.

KASAMATSU SHINJI
ICHIKAWA YUTA

PCT/JP2018/004778

August 30, 2018

February 13, 2018

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SANYO ELECTRIC CO (JP)

H01M10/0587

JP2003157902A	2003-05-30
JP2008041581A	2008-02-21
JP2013064086A	2013-04-11
JP2008171632A	2008-07-24

TOKUDA Yoshiaki et al. (JP)

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