Hitachi, Ltd.

Hitachi Vehicle Energy, Ltd.

Hitachi Metals, Ltd.

Hitachi Automotive Systems, Ltd.

Hitachi Cable, Inc.

Proterial, Ltd.

Kinya Aota

Yasuo Ishimaru

Hisanori Okamura

Tsuyoshi Takenaka

Masakuni Ezumi

Isao Funyuu

Akihiro Satou

Satoshi Hirano

Kazutaka Okamoto

Kouichi Kajiwara

Takeshi Kawasaki

Tadashi Fujieda

Takahiko Kato

Masahiko Sakamoto

Sho Saimaru

Yasuhisa Aono

Takuro Tsunaki

Kenji Nakai

Kousuke Kuwabara

Tomio Odakura

Naoki Kimura

Fujio Hirano

Keisuke Sawada

Akinori Tada

Takenori Ishizu

Yutaka Sato

Akihiro Sato

Mitsuru Koseki

Kiyoyuki Sekine

Hideyuki Shibanuma

Hidemasa Kawai

Ryuji Kono

Hajime Murakami

Hiroyuki Satake

Masatsugu Arai

Masahisa Inagaki

Kenji Yamaga

Akihiko Chiba

Isamu Takahashi

Kouji Satou

Kenta Yamanaka

Isao Funyu

Seiichi Watanabe

Takao Ishikawa

Kosuke Kuwabara

Masaaki Iwasa

Hideki Kita

Xudong Zhang

Masayuki Doi

Yoshihisa Tsurumi

Yusaku Maruno

Toshiro Fujita

Mamoru Hirota

Yuichiro Koizumi

Shinichi Hasshuu

Kouichi Watanabe

Takahiro Ishizaki

Seiji Yamashita

Ryou Ishibashi

Masuhiro Onishi

Manabu Kagawa

Kouji Sato

Yingjuan Yang

Akihiro Satuo

Shoji Imanaga

An austenitic stainless steel includes a mixed grain structure composed of a columnar crystal having an average crystal grain size of 20 &#x3bc;m or less and an equiaxed crystal having an average crystal grain size of 5.0 &#x3bc;m or less, in which an area proportion of the columnar crystal in the mixed grain structure is 20% or more, and an average crystal grain size of the whole mixed grain structure is 5.0 &#x3bc;m or less. Accordingly, it is possible to provide a material having excellent irradiation resistance and mechanical properties.

Austenitic stainless steel and reactor internal structure

An object of the invention is to provide: an alloy article that has excellent homogeneity in the alloy composition and microstructure as well as significant shape controllability, using an HEA with significant mechanical strength and high corrosion resistance; a method for manufacturing the alloy article; and a product using the alloy article. There is provided an alloy article comprising: Co, Cr, Fe, Ni, and Ti elements, each element in content of 5 to 35 atomic %; more than 0 atomic % to 8 atomic % of Mo %; and remainder substances of unavoidable impurities. And, ultrafine particles with an average diameter of 40 nm or less are dispersedly precipitated in matrix phase crystals of the alloy article.

Alloy article, method for manufacturing same, and product using same

A nuclear reactor fuel rod is a fuel rod for a light-water reactor. The nuclear reactor fuel rod includes a fuel cladding tube and an end plug, both of which are formed of a silicon carbide material. A bonding portion between the fuel cladding tube and the end plug is formed by brazing with a predetermined metal bonding material interposed, and/or by diffusion bonding. The predetermined metal bonding material has a solidus temperature of 1200&#xb0; C. or higher. An outer surface of the bonding portion, and a portion of an outer surface of the fuel cladding tube and the end plug, which is adjacent to the outer surface of the bonding portion are covered by bonding-portion coating formed of a predetermined coating metal. The predetermined metal bonding material and the predetermined coating metal have an average linear expansion coefficient which is less than 10 ppm/K.

Nuclear reactor fuel rod and fuel assembly having bundled same

An object of the invention is to provide: an HEA article that has excellent homogeneity in the alloy composition and microstructure as well as significant shape controllability, using an HEA with significant mechanical strength and high corrosion resistance; a method for manufacturing the HEA article; and a product using the HEA article. There is provided an HEA article comprising: Co, Cr, Fe, Ni, and Ti elements, each element in content of 5 to 35 atomic %; more than 0 atomic % to 8 atomic % of Mo %; and remainder substances of unavoidable impurities.

High entropy alloy article, method for manufacturing same, and product using same

An alloy structure has an arbitrary shape dimension which has high uniformity in the distribution of the element composition. The alloy structure contains Fe and at least four elements, which are selected from the group consisting of elements from atomic number 13 to atomic number 79 included in Group 3 to Group 16 of the periodic table of the elements and have a ratio of the atomic radius to an Fe atom of 0.83 or more but 1.17 or less, each of Fe and the four elements is contained in an atomic concentration range of 5 at % or more but 30 at % or less, a difference in atomic concentration between at least four elements among the at least four elements and Fe is in a range of less than 3 at %, and the alloy structure has, a column crystal in which the at least four elements and Fe are solid-dissolved.

Alloy structure and method for producing alloy structure

An alloy structure which has high uniformity in the distribution of the element composition and the mechanical strength and excellent high-temperature strength and corrosion resistance, contains Fe and at least four elements, which are selected from the group consisting of elements from atomic number 13 to atomic number 79, included in Group 3 to Group 16 of the periodic table of the elements, and have a ratio of the atomic radius to an Fe atom of 0.83 or more but 1.17 or less, each of the elements in an atomic concentration range of 5 at % or more but 30 at % or less, a difference in atomic concentration among the at least four elements and Fe is in a range of less than 3 at %, and the alloy structure has, as a main crystal, a column crystal in which the at least four elements and Fe are solid-dissolved.

An electric storage device includes a container which houses an electric generating element, and a sealing plug which seals a liquid injecting hole into which an electrolyte is injected. The liquid injecting hole is provided in a bottom surface of a recessed portion provided to be recessed on one side surface of the container. The sealing plug includes an inserting portion to be inserted into the liquid injecting hole and a fitting portion to be fitted into the recessed portion. At least either a rim portion of the fitting portion or an opening rim portion of the recessed portion is provided with a plurality of plastic deformation portions. In each of n regions (n is an integer of at least 3) into which an outer circumference of the fitting portion or an inner circumference of the recessed portion is equally divided, one or more of the plastic deformation portion(s) is/are arranged, and, in each of regions into which the outer circumference of the fitting portion or the inner circumference of the recessed portion is halved with an arbitrary plastic deformation portion out of the plastic deformation portions set as a starting point, one or more of the plastic deformation portion(s) is/are arranged. An outer circumferential side surface of the fitting portion and an inner circumferential side surface of the recessed portion are welded over an entire circumference.

Electric storage device and method for manufacturing electric storage device

A battery pack with a reduced resistance connection arrangement in which battery cells are arranged in rows in an insulating case and an electrode of each battery cell is coupled to an electrode of another battery cell through a connecting metallic plate. The connecting metallic plate is made of copper and is disposed on a positive electrode of one battery cell and a negative electrode of another battery cell to form a lap joint. Welds are formed in predetermined positions on the connecting metallic plate above the positive and negative electrodes by arc spot welding. The electrodes are formed of nickel-coated steel. The depth h of weld penetration in the weld is greater than the thickness Tof the connecting metallic plate and smaller than the thickness Tplus the thickness Tof one of the electrodes, that is, T&#x3c;h&#x2266;(T+T&#xd7;4/5).

Battery pack and method for welding cells

A secondary cell includes: an electrode roll in which a positive foil on which a positive-electrode material is coated and a negative foil on which a negative-electrode material is coated are winded through a separator into a flat shape around a winding core; a case in which the electrode roll is housed; a cover which seals the case; a positive terminal and a negative terminal provided on the cover; a positive electrode current collector plate that is electrically connected to the positive foil of the electrode roll and the positive terminal and held by the cover; and a negative electrode current collector plate that is electrically connected to the negative foil of the electrode roll and the negative terminal and held by the cover. The positive electrode current collector plate and the negative electrode current collector plate are each connected to the winding core.

Secondary cell

A lithium ion secondary battery comprises a case; a positive electrode foil having a current collector foil on which a positive electrode material is coated; an negative electrode film having a current collector film on which an negative electrode material is coated; a separator sandwiched between the positive electrode film and the negative electrode film, the films and the separator being arranged in multiple layers to form a group of electrodes enclosed in the case, a positive collector disc plate connected to the positive electrode side of the group of the electrodes, and an negative collector disc plate connected to the negative electrode side of the group of the electrodes. Each of the current collector foils has a non-coated portion extended along one side of the foils, a part or the entire of the non-coated portion being exposed from a side of the separator. At least one of the collector disc plate is welded to the side of the exposed non-coated portion of the group of the electrodes. The periphery of the collector disc plate has an annular portion, which is bent towards the group of electrodes.

Lithium ion secondary battery

A secondary battery includes: a jelly roll that includes a positive and a negative electrode wound via a separator; a case; a lid; and electrically conductive input/output members, wherein: the electrically conductive input/output members include, at least; a positive and a negative electrode current collector plate with one end thereof connected to the positive and the negative electrode respectively; a positive and a negative electrode external conductive member with one end thereof connected to another end of the positive and the negative electrode current collector plate respectively and another end thereof extending to an outer side of the lid; the one end of the positive and the negative electrode external conductive member are respectively swage-fused to the other end of the positive and the negative electrode current collector plate; and an oxide layer is formed at a surface of each swage-fused area.

Secondary battery and fabrication method thereof

The present invention provides a lithium-ion secondary battery which can suppress internal resistance to a small value. The lithium-ion secondary battery includes a winding group obtained by winding a positive electrode plate and a negative electrode plate via a separator. An end portion of a positive electrode mixture non-application portionprojects at an upper portion of the winding group, while an end portion of a negative electrode mixture non-application portion projects at a lower portion of the winding group. Current collecting disksare disposed on both end faces of the winding group so as to face them, respectively, and materials for the current collecting disks are the same materials as those for a positive electrode current collector and a negative electrode current collector. An end portion of the positive electrode mixture non-application portionis joined to a face of the current collecting diskpositioned on the side of the winding group at a plurality of joint portions on the positive electrode side, while an end portion of the negative electrode mixture non-application portion is joined to a face of the current collecting diskpositioned on the side of the winding group at a plurality of joint portions on the negative electrode side. Some of the joint portions form joint portions taking on a width expansion shape gradually expanding from a joint end portion with the positive electrode mixture non-application portiontoward the current collecting disk. A volume of the joint portionis increased.

Lithium-ion secondary battery

Battery

Growing community of inventors

Kudamatsu, Japan

Kinya Aota