Prime Planet Energy & Solutions, Inc.

Naoto Onodera

Hideki Sano

Azusa Nakanishi

Daisuke Nishide

Akira Kohyama

Provided is a technique for preventing plastic deformation of a battery case due to restraint during initial charging. A manufacturing method disclosed herein is a manufacturing method of a non-aqueous electrolyte solution secondary battery. This method includes assembling to construct a secondary battery assembly, and initial charging of the secondary battery assembly. In the initial charging, the initial charging is started with the secondary battery assembly restrained or not restrained; when a negative electrode potential of the secondary battery assembly reaches 0.6 V, a restraint force P1 is applied to the secondary battery assembly, wherein the restraint force P1 is greater than a restraint force applied before the negative electrode potential reaches 0.6 V; and the restraint force P1 is applied to the secondary battery assembly until the negative electrode potential reaches at least 0.3 V.

Non-aqueous electrolyte solution secondary battery and manufacturing method of non- aqueous electrolyte solution secondary battery

Provided is a technique for suppressing the formation of black regions in a wound electrode body. The production method disclosed herein is a method for producing a non-aqueous electrolyte secondary battery that includes a wound electrode body, a non-aqueous electrolyte, and a battery case. This production method includes the following steps: an assembling step Sof placing the wound electrode body and the non-aqueous electrolyte in the battery case to construct a secondary battery assembly; a first step Sof performing initial charging on the secondary battery assembly; and a second step Sof setting the temperature of the wound electrode body to 50° C. or lower and keeping this state for at least 72 hours after the first step.

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Kobe, Japan

Naoto Onodera