Matsushita Electric Industrial Co., Ltd.

Other

M&g Eco-Battery Co., Ltd.

Japan Capacitor Industrial Co., Ltd.

Sumitomo Electric Industries, Limited

M&g Eco-Battery Institute Co., Ltd.

Isao Matsumoto

Munehisa Ikoma

Hiroshi Kawano

Yoshio Moriwaki

Hirokazu Kimiya

Yoichi Izumi

Hiroyuki Sakamoto

Hidekatsu Izumi

Kohji Yuasa

Akihiro Maeda

Nobuyuki Yanagihara

Masakazu Ikeyama

Osamu Takahashi

Hua Zhou

Hiromu Matsuda

Tsutomu Iwaki

Eiji Kadouchi

Koji Kuwana

Susumu Kitaoka

Akira Iwase

Yasuko Ito

Kazutaka Iwasaki

Takashi Hino

Yoshinori Toyoguchi

Nobuyasu Morishita

Shozo Fujiwara

Takayuki Hayashi

Takabumi Fujii

Kenichiro Shibata

Norikatsu Akutsu

Mamoru Iida

Koji Yoshioka

Koichi Inoue

Minoru Yamaga

Hiroshi Sato

Yoshimitsu Hiroshima

Hiroshi Narusawa

Kimie Muramatsu

Mamoru Ishitobi

Shoichi Hashimoto

Masayuki Domen

Keisuke Aoki

Youichi Izumi

Using the generally used coating method of an active material paste to a metal foil on a 3DF made the electrode properties instable due to residual air inside of the 3DF, and had the risk of causing micro short circuit of the battery due to metal fine powder and the like adhered to the 3DF and the 3DF exposed to the electrode surface. To solve the above-mentioned, the coating of the active material paste to the 3DF was made into a two-step coating process as shown below. Step one removes the air and fills the paste at the same time by applying the paste flow from one side of the 3DF (the first step coating process). Step two coats a new paste onto the surface of the electrode obtained by step one (the second step coating process). This electrode obtained by the two-step coating process hardly has remaining air amount, can uniformly confine metallic power dust or the 3DF itself inside the electrode (the first step coating process), and in addition to this, has the capability of Li ions freely moving between the electrode surface and the depth portion of the electrode through the opening portion formed on the tip portion of the innumerable protrusions of the 3DF, the micro short circuit of the battery due to Li dendrite was prevented even in repeated charge and discharge.

Method for manufacturing electrodes using three-dimensional substrate for electrochemical applied products

In a method for manufacturing a metal-made three-dimensional substrate, a metal foil is passed between a pair of rollersand. Each surface S of a pair of the rollersandis provided with protrusion portionsarranged in a grid pattern, and the protrusion portionsare arranged so that protrusionsof the one rollerare oriented toward the centerof a virtual quadrangle having four adjacent protrusion portionstoof the other rolleras the apices.

Method for manufacturing metal-made three-dimensional substrate for electrodes, metal-made three-dimensional substrate for electrodes and electrochemical applied products using the same

An electrode group E in which a positive electrodeand a negative electrodeare spirally-rolled interposing a separatoris contained in a bottomed cylindrical can. A metal exposure portionprovided on an end surface of the positive electrodeof the electrode group E or a metal-made current collecting plateelectrically connected to the metal exposure portion(called a current collecting portion of a positive electrode) and a cover bodyalso functioning as a positive electrode terminal are electrically connected by a metal lead plate. One or more electrolyte resistant metal pressersare arranged and electrically connected between the current collecting portion of the positive electrode and the cover body. The electrode group E is applied pressure by the cover bodyand the bottom portionof the bottomed cylindrical can

Secondary battery with a spirally-rolled electrode group

Spirally-rolled electrodes for batteries wherein the electrodes having a concentric circle shape or an elliptic shape with positive electrode and negative electrode wound spirally via a separator therebetween has the characteristics as below:

Spirally-rolled electrodes with separator and the batteries therewith

The connection structure between unit cells connects a plurality of batteries Band Bin series with bottomed cylindrical battery casesandwhich function as electrode terminals on one side, sealing plateswhich close the opening portions of the battery casesandwhich function as electrode terminals on another side, and the first ringwith a flange is conductively connected at a bottom portion of a battery caseof one battery B, the second ringwith a flange is conductively connected at an upper portion of the sealing plateof another battery B, and the first ringand the second ringare fitted.

Connection structure between unit cells

A secondary battery can prevent microscopic short circuit due to shedding of active material from an electrode and secure electric connection between the electrode and an electrode terminal. According to an example of means for preventing shedding of active material from a positive electrodeconstituting a wound type electrode unit, a negative electrode side of a separatoris bent toward a center of the electrode unit. The negative electrodehaving a flex substrate is provided with an electrode end portionwith almost no active material. At least a part of the electrode end portionis exposed from the bent separator, and the exposed electrode end portionis electrically connected to a battery terminal or a battery casedirectly or via a negative electrode collector plate

Secondary battery

The present invention relates to the separator for batteries wherein the non-woven cloth comprising fibers mainly composed of polyolefin type resin is provided with hydrophilic property on the fiber surface at least by sulfuric compound and characterized as follows:

Process for producing separator for batteries, the separator for batteries, and alkaline storage batteries using the same

An electrode substrate is formed by mechanically processing a nickel foil so as to be made three dimensional through the creation of concave and convex parts, and then, this substrate is filled with active material or the like so that an electrode is manufactured, wherein the above described concave and convex parts are rolling pressed so as to incline in one direction. Furthermore, an electrode for secondary battery is formed by using the above described method.

Non-sintered thin electrode for battery, battery using same and process for same

A metal sheet ( ) which constitutes a non-sintered type electrode support is processed to have minute irregularities on its surface. The irregularities are formed by a mechanical method such that protrusions ( ) and indentations ( ) are configured with a center-to-center pitch (P) in the range of from 50 to 300 &mgr;m and such that the apparent thickness after processing is at least three times as large as the unprocessed material thickness.

Non-sintered electrode and method of manufacturing same

A nickel positive electrode including an active material mixture mainly composed of a nickel oxide and an electrically conductive support, a metal and/or an oxide thereof including elements effective for increasing oxygen overvoltage, preferably at least one element selected from Ca, Ti, Nb, Cr, Y and Yb is contained in a conducting agent such as metallic Co and/or Co oxide added to supplement the electrical conductivity of the active material. By virtue of this construction, the decrease of charging efficiency caused by increase of battery temperature and decrease of the oxygen overvoltage with charging of the battery can be inhibited and the charging efficiency can be improved in a wide temperature atmosphere. Thus, a nickel-metal hydride storage battery of high capacity can be provided.

Alkaline storage battery

A battery has elements for electromotive-force accommodated in a metal outer can which has a bottom having a cylindrical, prismatic or similar shape. The ratio of the bottom thickness (TA) the side thickness (TB) is 1.5-7.0. The metal outer can contains primarily iron and a layer of nickel is provided on at least the inner face of the battery. Shallow grooves are formed on the nickel layer perpendicular to the bottom face. An iron-based metallic sheet formed with a nickel layer on at least one face is subjected to drawing forming into a tubular shape having a bottom, continuous ironing processing being performed such that the side of the can formed in the tubular shape has an ironing ratio in the range of 20% to 90% and a metal outer can is thereby manufactured having a ratio of a bottom thickness to its side thickness from 1.5 to 7.0, having a cylindrical shape, prismatic shape or shape similar thereto, and with shallow longitudinal grooves formed in a nickel layer provided on the battery inside face.

Metal outer can for a battery and method of manufacturing same

A process for producing positive electrode active material includes feeding an aqueous nickel salt solution, aqueous solutions of different kinds of metals, aqueous solution containing ammonium ions and aqueous alkali solution each independently and simultaneously into a reaction vessel such that the amount of alkali metal is 1.9-2.3 moles relative to 1 mole of the total amount of nickel and different kinds of metals and the amount of ammonium ions is 2 moles or more relative to 1 mole of the total amount of nickel and different kinds of metals, the pH in the vessel is 11-13, the temperature in the vessel is 30-60&deg; C. and the average residence time is 20-50 hours. Further, in the process step of continuously growing the complex metal oxide particles from the salts of a plurality of metal elements through a plurality of successive reaction-deposition stages, the compositions and/or the kinds of the salts of metal element groups used for forming the oxide in the reaction-deposition stages adjacent to each other are made to be different from each other.

Manufacturing method of active materials for the positive electrode in alkaline storage batteries

Disclosed is a high capacity positive active material for an alkaline storage battery comprising a nickel based multi-metals oxide, wherein the charge characteristic at high temperature is improved. This oxide has a large number of micropores in at least a surface layer. An average composition of the surface layer is different from that of the interior in that at least one element selected from the group consisting of Ca, Ti, Zn, Sr, Ba, Y, Cd, Co, Cr, Bi and lanthanoids, in addition to Ni, is contained in the surface layer, or in that the at least one element is contained at a concentration higher than that of the interior.

Positive electrode active material for alkaline storage batteries

A battery accommodates elements for electromotive-force within a metal case. This metal case is a metal case having a bottom wherein the bottom thickness/side thickness ratio has a value of 1.2-4.0 and has a cylindrical, prismatic or similar shape. The metal case is constructed of a metal material whose chief constituent is aluminum. Furthermore, it is desirable that a multiplicity of shallow grooves perpendicular to a bottom face are formed in at least a battery inside face of the metal case and moreover that a nickel layer is provided on the battery inside face. The metal case is made by DI processing involving drawing and ironing, to have a value of bottom thickness/side thickness ratio which was hitherto unavailable,i.e., 1.2-4.0 can be obtained.

Battery and method of manufacturing therefor

Growing community of inventors

Osaka, Japan

Isao Matsumoto