Gs Yuasa International Ltd.

Japan Storage Battery Co., Ltd.

Gs Yuasa Corporation

Shinya Kitano

Takefumi Inoue

Tomonori Kako

Hiroshi Nakahara

Mikito Nagata

Hiroaki Yoshida

Hiroyuki Yumoto

Yudai Kawasoe

Katsushi Nishie

Tetsuya Murai

Mikio Okada

Hiroshi Mukai

Sumio Mori

Noriyoshi Munenaga

Masashi Nakamura

Yoshihiko Mizuta

Kenichi Sejima

Taku Nakamura

Shigeo Komatsu

Hidefumi Hasegawa

Hiroshi Sekiguchi

Keisuke Anami

Hirotsugu Ioka

Masahiro Tagawa

Provided is an energy storage device including a container with high productivity and satisfactory corrosion resistance. In the energy storage device including the container housing an electrode assembly having a positive electrode and a negative electrode, and electrolyte solution, the container is made of stainless steel including 0.09% by weight or more aluminum and has welded portions and where the stainless steel is welded.

Energy storage device

A condition estimation device includes a voltage measurement circuit, memory, and a controller. The voltage measurement circuit measures an open circuit voltage (OCV) of an electric storage device. The memory is configured to store first information on a correlation between a positive electrode potential and an electric storage capacity and second information on a correlation between a negative electrode potential and an electric storage capacity. The controller is configured to: measure an OCV under charge or discharge; calculate an electric storage capacity of the electric storage device having the OCV equal to a reference voltage; correct at least one of the first information and the second information such that a potential difference at the calculated capacity is equal to the reference voltage; and generate an OCV characteristic based on the first and the second information after the at least one of the first and the second information is corrected.

Condition estimation device and method of generating open circuit voltage characteristic

A non-aqueous electrolyte secondary battery includes a positive electrode containing a positive-electrode active material, a negative electrode containing a negative-electrode active material, and a non-aqueous electrolyte, and is characterized in that the non-aqueous electrolyte contains 1.0 wt % or less of a compound represented by formula (1) and 2.0 wt % or less of a cyclic sulfate ester represented by formula (2), based on the total weight of the non-aqueous electrolyte. By using the non-aqueous electrolyte including a specified amount of the compound represented by formula (1) and a specified amount of the cyclic sulfate ester, when the battery is used at a low temperature after being stored at a high temperature, the increase of the internal resistance is inhibited.

Non-aqueous electrolyte secondary battery, and method for fabricating non-aqueous electrolyte secondary battery

A non-aqueous electrolyte secondary battery is described, capable of inhibiting the raise of the internal resistance at a low temperature after use in a high-temperature circumstance, and having a good power performance at a low temperature. The non-aqueous electrolyte secondary battery has a non-aqueous electrolyte, and is characterized in containing a sulfate ester with a specific structure in an amount of 4.0 wt % or less relative to the total weight of the non-aqueous electrolyte.

Non-aqueous electrolyte secondary battery, non-aqueous electrolyte, and method for fabricating non-aqueous electrolyte secondary battery

A nonaqueous secondary electrolytic battery comprising an electricity-generating element formed by spirally winding a laminate of a positive electrode plate, a separating material and a negative electrode plate, and an electrolytic solution with which the separating material, if it is a separator, is impregnated. The electricity-generating element is sealed in a battery case formed by a resin-laminated sheet comprising a metal layer as a barrier layer. Only a pair of lead terminals are drawn to the exterior of the battery case. The resin sheet comprises an oriented resin layer laminated on both surfaces of the metal layer. The inner heat-fused layers are opposed and heat-fused to each other. A molten and solidified resin mass is formed protruding from the inner end of the welded portion toward the inner space of the battery by 0.1 mm or more. Alternatively, the welded portion is formed thinner at the outer end thereof than at the inner end thereof.

Nonaqueous secondary electrolytic battery

A process for the production of a non-aqueous electrolyte battery which comprises a polymer layer forming step of forming a polymer layer on one side of at least one of a positive electrode, a negative electrode and a separator and an electricity-generating element preparing step of laminating or winding the positive electrode, the negative electrode and the separator to prepare an electricity-generating element. The process for the production of a non-aqueous electrolyte battery further comprises battery preparing step of receiving the electricity-generating element in a battery case, injecting an electrolyte into the battery case and then hermetically sealing the battery case to prepare a non-aqueous electrolyte battery and a heating and cooling step of heating and cooling the non-aqueous electrolyte battery while the battery case is under pressure.

Process for the production of non-aqueous electrolyte battery

In a battery having a aluminum or aluminum alloy casing welded to and aluminum or aluminum alloy cover, a film of a synthetic resin and a corrosion preventing agent is formed on the outer surface of the battery raising and an electrolyte comprising hydrofluoric acid is placed in the casing. The film is capable of absorbing hydrofluoric acid. In an alternative embodiment, the exterior film may be a ceramic material capable of absorbing hydrofluoric acid.

Aluminum battery casing with corrosion preventing film

In a nonaqueous electrolyte battery, a negative electrode terminal is fixed to an insulating ceramic material with filler materials for brazing mainly composed of copper and insulation-sealed to an opening of a metallic exterior member with the ceramic material being provided interposed therebetween. A positive electrode terminal fixed to an insulating ceramic material with an aluminum alloy-based filler materials for brazing and insulation-sealed to the opening in the metallic exterior member.

Nonaqueous electrolyte battery having hermetically sealed terminals

A metallic ring is insulatedly sealed around each of the positive electrode terminal and negative electrode terminal, previously, by the glass hermetic seal and ceramic hermetic seal in such a manner that it is sealed into the opening hole of the cover plate of a battery case. In this case, in order to prevent the corrosion of a metallic brazer which may occur in the ceramic hermetic seal and improve the workability, the ceramic material is brazed around the negative electrode terminal through a Au&mdash;Cu brazer or P&mdash;Cu brazer.

Nonaqueous-electrolyte battery

Growing community of inventors

Kyoto, Japan

Shinya Kitano