Kabushiki Kaisha Toshiba

Toshiba Battery Co., Ltd.

Other

Hirotaka Hayashida

Masaaki Yamamoto

Motoya Kanda

Hiroshi Kitayama

Hideki Yoshida

Isao Sakai

Shusuke Inada

Takamichi Inaba

Takao Sawa

Tatsuoki Kohno

Tatsuoki Kono

Fumiyuki Kawashima

Yuji Sato

Shirou Takeno

Hiroyuki Takahashi

Hiroyuki Hasebe

Kazuya Kuriyama

Kazuta Takeno

Kiyoshi Mitsuyasu

Tomoyuki Ono

Ichirou Sawatari

Hiroki Inagaki

Kazuhiro Yoshida

Hidesato Saruwatari

Dai Yamamoto

Akira Yajima

Yoshinao Tatebayashi

Hideki Satake

Masanori Tanaka

Kunihiko Miyamoto

Haruchika Ishii

Kengo Kurata

Hirohito Teraoka

Ken-ichi Kanno

Hideharu Suzuki

Masataka Shikota

Naomi Bando

Katuyuki Hata

Yuuichi Sato

Kunihiko Sasaki

Yuichi Kikuma

Toshihide Arikawa

Hirotada Tahara

Koji Ishiwa

Kengou Kurata

Tsuyoshi Soeda

According to an embodiment, there is provided a battery system. The battery system includes a first battery and a second battery connected in parallel with the first battery. The first battery includes a lead storage battery. The second battery includes a nonaqueous electrolyte battery. The nonaqueous electrolyte battery includes a positive electrode and a negative electrode. The negative electrode includes a negative-electrode-mixture layer, and the negative-electrode-mixture layer contains lithium titanate. The positive electrode contains a positive electrode active material LiMnM(a)O. A ratio of a battery capacity of the second battery to a battery capacity of the first battery is in a range of 1/133 to 1/2.

Battery system

A non-aqueous electrolyte secondary battery of an embodiment includes an exterior member, a negative electrode containing a titanium-containing oxide housed in the exterior member, a positive electrode housed in the exterior member, a separator housed in the exterior member and arranged between the positive electrode and the negative electrode, and a non-aqueous electrolyte solution housed in the exterior member. At least one type or more chain carbonates are contained in a solvent of the non-aqueous electrolyte solution. A self-diffusion coefficient of the chain carbonate in &#x2212;20&#xb0; C. is front 1.4&#xd7;10to 2.0&#xd7;10m/sec.

Non-aqueous electrolyte secondary battery and battery pack

A nonaqueous electrolyte secondary battery includes an electrode assembly having a high-density positive electrode in which a positive electrode active material layer is formed on at least one surface of a positive electrode current collector, a high-density negative electrode in which a negative electrode active material layer is formed on at least one surface of a negative electrode current collector, and a separator interposed between the positive and negative electrodes, and has a structure in which the electrode assembly is impregnated with a nonaqueous electrolyte, wherein the specific surface area per unit area of the positive electrode active material layer of the positive electrode is 0.5 to 1.0 times the specific surface area per unit area of the negative electrode active material layer of the negative electrode which opposes the positive electrode with the separator sandwiched between them.

Nonaqueous electrolyte secondary battery including positive electrode active material layers having parallel grooves

The invention provides a nonaqueous electrolyte secondary battery excellent in output characteristic such as large current discharge or pulse discharge in ordinary use, high in safety by preventing destruction due to suppression of current in an abnormality such as external short-circuiting, and further large in capacity. The nonaqueous electrolyte secondary battery comprises an external can opened at one end thereof, an electrode assembly contained in the external can, and comprising a negative electrode, a separator and a positive electrode, a nonaqueous electrolyte contained in the external can, and a sealing lid group tightly sealed at the opening of the external can by way of an insulating member, wherein the sealing lid group includes an intact plate-like PTC element having a fragile portion to be easily broken due to elevation of internal pressure by gas generation.

Nonaqueous electrolyte secondary battery

The present invention provides a hydrogen absorbing alloy containing as a principal phase at least one phase selected from the group consisting of a second phase having a rhombohedral crystal structure and a first phase having a crystal structure of a hexagonal system excluding a phase having a CaCutype structure, wherein a content of a phase having a crystal structure of ABtype is not higher than 10% by volume including 0% by volume and the hydrogen absorbing alloy has a composition represented by general formula (1) given below:RMgTNiM1M2Mn&#x2003;&#x2003;(1).

Hydrogen absorbing alloy and secondary battery

The present invention provides a hydrogen absorbing alloy containing as a principal phase at least one phase selected from the group consisting of a second phase having a rhombohedral crystal structure and a first phase having a crystal structure of a hexagonal system excluding a phase having a CaCutype structure, wherein a content of a phase having a crystal structure of ABtype is not higher than 10% by volume including 0% by volume and the hydrogen absorbing alloy has a composition represented by general formula (1) given below:MgTNiM1M2Mn.&#x2003;&#x2003;(1)

The present invention provides a hydrogen absorbing alloy containing as a principal phase at least one phase selected from the group consisting of a second phase having a rhombohedral crystal structure and a first phase having a crystal structure of a hexagonal system excluding a phase having a CaCutype structure, wherein a content of a phase having a crystal structure of ABtype is not higher than 10% by volume including 0% by volume and the hydrogen absorbing alloy has a composition represented by general formula (1) given below:RMgTNiM1M2Mn. &#x2003;&#x2003;(1)

Hydrogen-absorbing alloy, secondary battery, hybrid car and electromobile

A nickel-metal hydride secondary battery comprising electrode group comprising positive electrode comprised mainly of nickel hydroxide, negative electrode comprised mainly of a hydrogen storage alloy, and separator being disposed between the positive electrode and the negative electrode, wherein the electrode group is sealed in battery casing, together with an alkali electrolyte liquid, wherein, in the battery, a W element and an Na element are present simultaneously. The nickel-metal hydride secondary battery of the present invention is advantageous not only in that it exhibits high utilization of the active material and excellent self-discharge characteristics in a high temperature storage as well as high charging efficiency in a high temperature environment, but also in that it has excellent large current discharge characteristics.

Nickel-metal hydride secondary battery

Hydrogen-absorbing alloy and secondary battery

Nickel-hydrogen secondary battery

A nickel-hydrogen secondary battery having a negative electrode comprising a hydrogen-absorbing alloy containing magnesium, a rare earth element and nickel as essential elements, which is capable of suppressing the self-discharge being occurred under the condition of high temperature storage, or the like. This secondary battery comprises a negative electrode containing a hydrogen-absorbing alloy, a positive electrode containing nickel hydroxide, a separator comprising a non-woven fabric, and an alkaline electrolyte. The hydrogen-absorbing alloy is represented by (R,Mg,)Ni,A,(wherein R is at least one element selected from rare earth elements (including yttrium), Ca, Zr and Ti, A is at least one element selected from Co, Mn, Fe, V, Cr, Nb, Al, Ga, Zn, Sn, Cu, Si, P and B), and x, y and z are atomic ratio individually defined as 0<x<1, 0&lE;z&lE;1.5, 2.5&lE;y&plus;z<4.5). The ratio between the weight of the hydrogen-absorbing alloy per unit area of the negative electrode (M,(mg/cm,)) and the weight per unit area of the separator (M,(g/m,)) meets the condition of M,/M,&lE;6.

There is provided a hydrogen-absorbing alloy which contains an alloy ingot manufactured by means of a casting or sintering method or a pulverized product of the alloy ingot, and the alloy ingot being represented by the following general formula (1),

Hydrogen-absorbing alloy

A nickel-hydrogen secondary battery comprising, a positive electrode containing nickel hydroxide, a negative electrode containing a hydrogen-absorbing alloy, a separator interposed between the positive electrode and the negative electrode and containing olefin-containing-polymer based fibers having an ion-exchange group, and an alkaline electrolyte having a normality of 5 or more in concentration, wherein the separator satisfies the following equation (1):

A nickel-hydrogen secondary battery is disclosed wherein a long life is assured, an improved self-discharging property in a high temperature storage and the inhibition of increase in inner pressure of the battery in the occasion of over-charging can be realized. The nickel-hydrogen secondary battery comprises, a case, a paste-type positive electrode accommodated in the case and containing nickel hydroxide and a polymeric binder, a paste-type negative electrode accommodated in the case and containing a hydrogen-absorbing alloy and a polymeric binder, a separator accommodated in the case in so as to be interposed between the positive and negative electrodes, and an alkali electrolyte accommodated in the case. The separator is formed of a sheet material containing polyolefin-based synthetic resin fibers and has a hydrophilic first surface and a second surface having hydrophilic and hydrophobic portions, the separator is interposed between the positive and negative electrodes with the second surface facing toward the negative electrode.

Growing community of inventors

Fujisawa, Japan

Hirotaka Hayashida