Toyo Kohan Co., Ltd.

Toyo Kohan., Ltd.

Hiroaki Kawamura

Tsuneo Inui

Yoshikazu Kondo

Hiroaki Okamoto

Kinji Saijo

Atsuo Tanaka

Terunori Fujimoto

Yoshiyuki Sugimoto

Masatoki Ishida

Nobuyuki Tsutsui

Yoshihiko Isobe

Masanobu Matsubara

Ryoichi Fukumoto

Tadashi Nemoto

Kinji Saijyo

Osamu Yoshioka

A method of forming a protective coating on a cell safety valve element by coating the cell safety valve element with a protective film to protect metal portions thereof against corrosion, a cell safety valve element coated with a protective film, a cell sealing plate using the element, and an enclosed cell using the plate. The safety valve element comprises a coating ( ) obtained by applying an organic paint onto at least one surface of the cell safety valve element ( ) consisting of a metal base plate ( ) having a through hole ( ) drilled therein and a metal foil ( ) laminated on the metal base plate ( ) so as to block the through hole ( ). The sealing plate is formed by bringing the cell safety valve element ( ), on which a protective coating ( ) comprising an organic resin film is formed, into contact with a cell exterior can sealing plate ( ), in which the through hole ( ) acting as a safety valve port is drilled so that the through hole ( ) in the metal base plate of the cell safety valve element ( ) and the through hole ( ) in the sealing plate face each other and bonding the both at a portion around the through hole ( ) in the sealing plate to form the cell sealing plate. The enclosed cell is formed by fitting and supporting the cell sealing plate at the inner periphery of an opening of the cell exterior can in which are housed an electrode body consisting of a positive electrode, a negative electrode and a separator together with an electrolyte to block the opening in the cell exterior can.

Method of forming protective coating on cell safety valve element, cell safety valve element coated with protective film, cell sealing plate using the element, and enclosed cell using the plate

A safety device for a closed battery capable positively preventing a rupture due to a rapid internal pressure rise at over-packing and short-circuiting and being produced inexpensively, a positive electrode lid ( ) attached to one end of an outer covering can ( ) comprises a pressure receiving plate ( ) forming the innermost lid and connected to positive electrode ( ) of an electrode unit ( ) via positive electrode lead ( ), a shielding plate ( ) forming a middle lid and electrically connected to the pressure receiving plate ( ) via a center contact ( ), and a sealing plate ( ) forming the outermost lid and electrically connected to the shielding plate ( ). The center contact ( ) is formed of a projection ( ) having a first flat contact surface ( ) of the pressure receiving plate ( ) and a second flat contact surface ( ) of the shielding plate ( ), and a plurality of annular grooves ( ) are alternately provided around the second flat contact surface ( ) so as to face each other at 180&deg; intervals, the annular grooves ( ) being covered with a metal foil ( ) to form valve membranes ( ).

Safety device for sealed battery and sealed battery using it

A completely-enclosed cell wherein if the internal pressure in the cell rises because of short circuit or overcharging, temperature rise and explosion of the cell is effectively prevented, the current is cut off, and the internal pressure is simultaneously and quickly released. The cell includes a sealer comprising a valve body composed of a metal substrate perforated at narrowly spaced intervals in the endless periphery and a metal foil substrate to cover the perforations. The cell a structure in which a narrow gap portion of a 98 metal plate deformable even by a weak force of when the internal pressure increases elongates and the portion surrounded by the through holes projects

Enclosed cell and sealer

A copolyester film was laminated onto a steel sheet, this sheet having double layers consisting of a lower layer of metallic chromium and an upper layer of hydrated chromium oxide on a tin plated steel sheet in which 5 to 40% of the surface of the steel sheet is covered with plated tin and the remainder of the steel surface is exposed and the space between plated tin particles is 0.5 to 50 .mu.m, and a method for production of this copolyester resin film laminated steel sheet which comprises: (a) electroplating with tin under restricted conditions, (b) formation of said double layer on the plated tin and exposed steel surface and (c) lamination of the copolyester resin film at a temperature above the melting temperature of tin. This copolyester resin film laminated steel sheet is suitable for applications wherein excellent corrosion resistance after severe forming is required, such as deeply drawn cans, drawn and redrawn cans, drawn and stretch formed cans, drawn and partially ironed cans and can ends in which a tab for easy opening is attached.

Method for making a tin-plated steel sheet with a chromium bilayer and a

A copolyester film was laminated onto a steel sheet, this sheet having double layers consisting of a lower layer of metallic chromium and an upper layer of hydrated chromium oxide on a tin plated steel sheet in which 5 to 40% of the surface of the steel sheet is covered with plated tin and exposed steel surface and a space between plated tin particles is 0.5 to 50 .mu.m, and a method for production of this copolyester resin film laminated steel sheet which comprises: (a) electroplating with tin under restricted conditions, (b) formation of said double layer on plated tin and exposed steel surface and (c) lamination of the copolyester resin film at above the melting temperature of tin. This copolyester resin film laminated steel sheet is suitable for applications wherein excellent corrosion resistance after severe forming is required, such as deeply drawn cans, drawn and redrawn cans, drawn and stretch formed cans, drawn and partially ironed cans and can ends in which a tab for easy opening is attached.

Tin-plated steel sheet with a chromium bilayer and a copolyester resin

A surface treated steel sheet having double layers consisting of a lower layer of metallic chromium and an upper layer of hydrated chromium oxide are formed on a low tin plated steel sheet in which 30 to 80% of the surface of the steel sheet is covered with plated tin. Also, the ratio of the area of tin, which actually combined with steel sheet, to the projected area of plated tin to the steel sheet is 20 to 90% and the size of the exposed steel surface units, after tinplating, is 0.5 to 20 .mu.m in diameter when expressing the irregularly exposed areas as circles, and a method for production of this surface treated steel sheet which comprises; (a) electroplating with a small amount of tin under restricted conditions in order to obtain the low tin plated steel sheet described above, (b) after reflowing or without reflowing of the plated tin, formation of said double layer or formation of the metallic chromium layer followed by formation of hydrated chromium oxide under restricted conditions. This surface treated steel sheet is suitable for producing a welded can body without removing the plated layer at high speed, since it is excellent in weldability, lacquer adhesion and corrosion resistance after lacquering.

Surface treated steel sheet for welded can material

A process for producing a thin tin and zinc plated steel sheet which comprises electroplating zinc on a steel sheet from a zinc electroplating bath containing zinc ions followed by tin-plating the zinc plated steel sheet by immersion or by immersion followed by electroplating in a tinplating bath containing stannous ions, whereby zinc ions from the zinc plated steel sheet replace the stannous ions in the tinplating solution during the immersion tinplating. The resultant solution from the tinplating which contains zinc ions is recycled to make up the zinc electroplating bath.

Process for producing a thin tin and zinc plated steel sheet

A steel sheet is provided herein which has been treated to form thereon a first very thin layer of tin and a second layer of hydrated chromium oxide. This treated steel sheet can effectively be coated with an organic coating, and can be used for producing cans for foodstuffs and carbonated beverages.

Steel sheet useful in forming foodstuff and beverage cans

A steel sheet which has been treated to form thereon a first layer of an iron-tin alloy and a second layer of hydrated chromium oxide. This treated steel sheet can be effectively coated with an organic coating, and is useful in forming cans for foodstuffs and carbonated beverages.

Growing community of inventors

Yamaguchi-ken, Japan

Hiroaki Kawamura