Gs Yuasa International Ltd.

Takaaki Iguchi

Sumio Mori

Toshiyuki Nukuda

Kazuki Furukawa

Kazuya Okabe

Tokuo Inamasu

Akihiro Fujii

Seijiro Ochiai

Hiroki Matsui

Yuta Kashiwa

Suguru Kozono

Ryuji Shiozaki

Toshiaki Kojima

Hiroshi Yufu

Kazushi Nitta

Takanobu Araki

Junichi Kuratomi

Yasuyuki Abe

Hanako Miyasaka

Takashi Watari

A charge voltage controller for a chargeable and dischargeable energy storage device including an electrode assembly having a positive electrode and a negative electrode, is configured to control upper limit voltage applied to charge the energy storage device in accordance with at least one of charge time of the energy storage device, current inputted to the energy storage device, temperature of the energy storage device, and a state of charge of the energy storage device, to inhibit potential of the negative electrode from being lower than deposition potential at which metal ions transmitting and receiving an electric charge between the positive electrode and the negative electrode are deposited at the negative electrode. The deposition potential is variable in accordance with a state of charge of the energy storage device, and/or charge time of the energy storage device, and/or current inputted to the energy storage device, and/or temperature of the energy storage device.

Charge voltage controller for energy storage device, energy storage apparatus, battery charger for energy storage device, and charging method for energy storage device

An embodiment provides a charge voltage controller for a chargeable and dischargeable energy storage device including an electrode assembly having a positive electrode and a negative electrode, the charge voltage controller configured to control upper limit voltage applied to charge the energy storage device in accordance with at least one of charge time of the energy storage device, current inputted to the energy storage device, temperature of the energy storage device, and a state of charge of the energy storage device, to inhibit potential of the negative electrode from being lower than deposition potential at which metal ions transmitting and receiving an electric charge between the positive electrode and the negative electrode are deposited at the negative electrode.

It is an object of an embodiment to provide a degradation estimator for an energy storage device, configured to estimate degradation of the energy storage device, an energy storage apparatus, an input-output control device for the energy storage device, and a method for controlling input and output of the energy storage device. The embodiment includes estimating a temporary power decrease rate of the energy storage device in accordance with at least one of an average load, a maximum load, and a &#x394;SOC obtained from detected current of the energy storage device and detected temperature of the energy storage device.

Degradation estimator for energy storage device, energy storage apparatus, input-output control device for energy storage device, and method for controlling input and output of energy storage device

Provided is an electrode assembly including: a negative electrode including a negative electrode current collector (NC) and a negative electrode active material layer (NAL) disposed on at least one surface of the NC; a positive electrode including a positive electrode current collector (PC), a positive electrode active material layer (PAL) disposed on at least one surface of the PC, and an undercoat layer being disposed between the PC and the PAL and being higher in resistance value than the PC. The negative electrode and the positive electrode are stacked on each other. In at least one side of the thus stacked negative and positive electrodes, the NAL projects from an edge of the PAL in a direction in which the NC and PC extend, and the undercoat layer projects from an edge of the NAL in the direction.

Electrode assembly, method for producing electrode assembly, and electric storage device including electrode assembly

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.

Electric storage device

Disclosed is a nonaqueous electrolyte secondary battery which is suppressed in increase of internal resistance, while having high capacity retention rate and small battery swelling even after a long use. Specifically disclosed is a method for manufacturing a nonaqueous electrolyte secondary battery, which is characterized by using a positive electrode containing a positive electrode active material having an &#x3b1;-NaFeO2 crystal structure and the following chemical composition: LixMnaNibCocOd (wherein 0&#x3c;x&#x3c;1.3, a+b+c=1, 1.7&#x2266;d&#x2266;2.3), while satisfying |a&#x2212;b|&#x3c;0.03 and 0.33&#x2266;c&#x3c;1, a negative electrode, and a nonaqueous electrolyte containing an unsaturated sultone and a sulfate ester compound.

Growing community of inventors

Kyoto, Japan

Takaaki Iguchi