Gs Yuasa International Ltd.

Kazushi Nitta

Takaaki Iguchi

Suguru Kozono

Yasuyuki Abe

Provided is a nonaqueous electrolyte secondary cell including: a case; an element housed in the case, including at least a positive electrode member, a negative electrode member and a separator; and an electrolyte solution poured into the case, wherein when in the state of the case being installed, in the direction perpendicular to the liquid surface of the electrolyte solution, the length between the highest position and the lowest position of the element is represented by Land the length between the liquid surface and the lowest position of the element is represented by L, the ratio calculated with the formula LL&#xd7;100 is 10% or more and 100% or less.

Nonaqueous electrolyte secondary cell

An electric storage device includes an electrode assembly, in which a positive electrode and a negative electrode in the shape of a sheet are wound with a separator sandwiched therebetween. The electrode assembly has a flat shape and includes a first flat portion and a second flat portion, which are opposed to each other, and a first curved portion and a second curved portion which connect end portions of the first and second flat portions together. One of the positive electrode and the negative electrode covers an inner-circumferential end portion of the other electrode and is disposed on an innermost circumference of the electrode assembly. An inner-circumferential end portion of the one of the electrodes causes an elastic force to act outwardly on the other electrode.

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Kyoto, Japan

Kazushi Nitta