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Publication numberUS3185595 A
Publication typeGrant
Publication dateMay 25, 1965
Filing dateApr 24, 1963
Priority dateApr 24, 1963
Publication numberUS 3185595 A, US 3185595A, US-A-3185595, US3185595 A, US3185595A
InventorsJr Raymond L Schenk
Original AssigneeUnion Carbide Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Reinforced cell closure
US 3185595 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

May 25, 1965 R. l.. scHENK, JR

REINFoRcED CELL cLosuRE Original Filed Aug. 4. 1960 INVENTOR.

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3,185,595 REBNFORCED CELL CLOSU Raymond L. Schenk, lr., Minneapolis, Minn., assignor to i Union Carbide Corporation, a corporation of New York Continuation of application Ser. No. 47,408, Aug. 4, 1960. This application Apr. 24, 1963, Ser. No. 275,378

4 Claims. (Cl. 136-133) This application is a continuation of my application Serial No. 47,408, filed August 4, 1960, now abandoned, for Reinforced Cell Closure.

This invention relates to a cell closure for cylindrical galvanic cells and more particularly to a closure for cells which are 11A inches in diameter or greater.

United States patent application Serial No. 774,931, led November 19, 1958, in the name of R. Carmichael et al. and now U.S. Patent No. 3,069,489 discloses an excellent closure for cylindrical alkaline galvanic cells which is extremely resistant to caustic creepage. The disclosed cell closure comprises an annular gasket of a hard, di-electric, plastic-like material which is resistant to cold iiow and a metallic container cover, the gasket being interposed between the cell container wall and the edge of the cell cover in supporting relation with the cell cover. The actual sealing is effected by radially compressingvthemgasket between the container and the cell cover under a high radial force. After the compressive force is removed from the container, the gasket will exert a radial compressive force outwardly against the container Which is substantially equivalent to, but not greater than, the yield strength of the metal of which the container is made.

The term cold flow as used herein and in the appended claims refers to the gradual deformation of a material that occurs when that material is subjected to a constant load at room temperature. Materials which deform very little or only when large forces are applied and which do not continue to deform or creep when the force is applied for a considerable length of time are said to have good cold flow characteristics.

In the above cell closure, the tensile strength of the metal container, the cold flow characteristics of the plastic gasket and the resiliency of the metal cover are factors which affect the success of the closure. The radial seal is accomplished by the balance of the internal resilience of the cover exerting a pressure on the compressed plastic gasket and the metal container resisting this internal force. During the actual radial sealing of the cell by a sizing die of smaller diameter than the container, the metal cover springs or bows, the plastic compresses and flows, and the container yields, growing in length and reducing in diameter.

The ability of the container to maintain this new diameter by resisting the internal forces after the sizing operation is all important if the closure is to be eiective in preventing caustic creepage. The ability of the metal container to resist such deforming is dependent upon the modulus of elasticity of the metal of the container. It is known that the yield or permanent set increases in direct proportion to an increase in the diameter of the container when the wall thickness remains the same.

It' may thus be appreciated that an increase in the diameter of the container will reduce the total elastic resistance of the container, keeping a constant wall thickness, and that the greater the total area, the higher the pressure employed must be in sealing the container, and accordingly, some difficulties may be encountered in sealing large diameter cells with the above disclosed cell closure.

ICC

The principal object of the invention is to provide radially sealed galvanic cells of relatively large diameters.

A concurrent object of the invention is to provide means whereby radially sealed relatively large diameter cylindrical containers may resist deforming under the pressure p exerted by the compressed plastic gasket and the stress energy stored in the cover.

The objects of the invention are accomplished by a cylindrical galvanic cell wherein the cell closure comprises an annular gasket having a depending flange and which is made of a hard di-electric material which is resistant to cold iiow, interposed and radially sealed between the container wall and a metal cover, the rim of which is offset from the horizontal; the top of the outside of the container being provided with a metal reinforcement ring.

The invention will be more readily understood by reference to the accompanying drawing wherein:

vFIGURE l is a front sectional view of a cylindrical galvanic cell employing the cell closure of the invention prior to being radially compressed; and

FIG. 2 is a view of the cell of FIG. l after it has been radially sealed.

In the practice of the invention, the seal gasket must be made of a material which will not be attacked by the corrosive electrolyte ofthe cell and which has good dielectric properties as well, the gasket serving to insulate the positiveiy and negatively charged parts of the cell. Of course, the material must be one generally characterized by its high compressive and shear strength and one capable of withstanding large stresses without a tendency to cold low.

Nylon, a polymer of hexamethylene diammonium adipate, is a hard plastic composition that has been found to be a suitable material for use in practice of the invention. A nylon plastic sold under the trademark Zytel is the preferred material.

Referring now to the drawing, the cell closure of the invention comprises an annular hard nylon gasket 10, provided with a tapered depending flange 12 and a second ange 14 which isolates the oppositely charged parts of the cell; the gasket 10 being interposed and radially sealed between a metal cell container 16 and a metal cover 18 in such a manner that the depending flange 12 is within the cell container 16 and the second flange 14 is outside the cell container 16. In addition, a metal reinforcing ring 20, provided with an inward facing ange 22 and a dependent flange 24, is provided around the top of the container wall 16.

The cover 18 is provided with an integral terminal boss 26 which acts to impart resiliency to the cover 13. The cover 13 accordingly acts as a spring and exerts a backup pressure on the nylon gasket 10 after radial sealing and insures the continuance of a good seal. This quality of resiliency is especially important when the cell is subjected to changes in temperature, and expansion or contraction of the container 16 and reinforcement ring 26 result. ln cells in which the contraction or expansion is significant, changes in diameter are compensated for by the spring-like action of the cover 18. To further insure this spring-like action of the cover 18, the rim 2S of the cover 18 is offset at an angle A which is between 5 and 10 and preferably 7 from the horizontal. By forming the cover 18 in this manner, the contents of the cell, i.e., the negative electrode 30, the separator 32 and the positive electrode 34, support the cover 18 and prevent it from buckling when the radial pressure is applied during the sealing operation.

The actual radial sealing of the cell, as shown in FIG. 2, may be accomplished in a number of ways, a typical way being by pushing or forcing an assembled cell through a sizing die so that the ring 20 is reduced in diameter to the diameter of the unreinforced portion of the container 16 thereby causing a maximum radial seal compressive force to be exerted against the container 16. The deformation of the metal container 16 by the sizing operation is permanent for any spring back of the container 16 after passing through the sizing die is prevented by the reinforcement ring 20.

l claim:

1. For sealing a galvanic cell which includes a cylindrical cupped metallic container containing an electrolyte, enclosing means comprising an annular hard plastic gasket which is resistant to cold ilow interposed between said container and a resiliently secured metallic cell cover; said gasket having a depending flange extending down inside of said container and a second iiange extending external of said container between said container and said cover; said cover being provided with an integral central terminal boss projecting upwardly and the rim of said cover being spaced radially outwardly from said boss and ottset upwardly from the horizontal at an angle of between and 10; and an external metal reinforcement ring encircling said container at its top, having a depending ange in direct contact with the outer periphery thereof and an inwardly facing ange adjacent said second ange on said gasket; said gasket being in a state of radial compression between said container and said cover and exerting a radial force substantially equivalent to but not greater than the yield strength of the metal of which said container and ring are made.

2. The enclosing means of claim 1 wherein said gasket is maderof hard nylon and said rim of said cover is oiset an angle of 7 from the horizontal.

3. A sealed galvanic cell comprising a cylindrical cupped metallic container having as internal elements therein a positive electrode, a negative electrode,` a'separator therebetween and an electrolyte, said cell being sealed at the open end of said cupped container by a closure which comprises an annular hard plastic gasket which is resistant to cold ow interposed between said container and a horizontally disposed resilient metallic cell cover of smaller diameter than said container; said gasket having a depending flange extending down inside of said container and a second flange extending axially external of said container which separates said container and said cover; said cover being supported by said internal cell elements and being provided with an integral central terminal boss which projects upwardly and the rim of said cover being offset upwardly from the horizontal at an angle of between 5 and 10; and an external metal reinforcement ring encircling said container at its top, having a depending ange in direct contact with the outer periphery thereof, and an inwardly facing flange in contact with said second ange on said gasket; said gasket being in a state of radial compression between said container and said cover rim and exerting a radial force substantially equivalent to, but not greater than, the yield strength of the metal of which said ring is made.

4. The sealed galvanic cell of claim 3 wherein said gasket is made of hard nylon, and said rim of said cover is offset an angle of approximately 7 from the horizontal.

References Cited by the Examiner UNITED STATES PATENTS Gelardin 136-133 JOHN H. MACK, Primary Examiner.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2541931 *Jul 9, 1947Feb 13, 1951Marathon Battery CompanyLeakproof dry cell
US2636062 *Nov 19, 1949Apr 21, 1953Mallory & Co Inc P RElectrochemical cell and selfventing enclosure therefor
US2802042 *May 6, 1954Aug 6, 1957Ray O Vac CoDry cell
US2879315 *Jun 14, 1955Mar 24, 1959Gelardin AlbertVented sealed dry cell construction
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4302517 *Jun 26, 1980Nov 24, 1981Union Carbide CorporationUnitary seal and cover support gasket for miniature button cells
US4523376 *Jun 17, 1983Jun 18, 1985General Electric CompanyMethod for sealing a rechargable cell
US4725515 *May 7, 1987Feb 16, 1988Eveready Battery CompanyOpen top, radial flange, u-shaped gasket extending over flange; leak resistant
US5080984 *Mar 29, 1985Jan 14, 1992Gates Energy Products, Inc.Radial seal for an electrochemical cell and method of making same
US5114808 *May 7, 1990May 19, 1992Eveready Battery Company, Inc.Cell cover with internal compression ring of high yield strength material
US5432027 *Mar 2, 1994Jul 11, 1995Micron Communications, Inc.Button-type battery having bendable construction, and angled button-type battery
US5486431 *Mar 2, 1994Jan 23, 1996Micron Communications, Inc.Method of producing button-type batteries and spring-biased concave button-type battery
US5494495 *Oct 11, 1994Feb 27, 1996Micron Communications, Inc.Method of forming button-type batteries
US5547781 *Mar 2, 1994Aug 20, 1996Micron Communications, Inc.Button-type battery with improved separator and gasket construction
US5580674 *Oct 11, 1995Dec 3, 1996Micron Communication, Inc.Method of producing button-type batteries and spring-biased concave button-type battery
US5603157 *Mar 2, 1994Feb 18, 1997Micron Communications, Inc.Methods of producing button-type batteries and a plurality of battery terminal housing members
US5642562 *Jun 6, 1996Jul 1, 1997Micron Communications, Inc.Method of forming button-type battery lithium electrodes with housing member
US5652070 *Jan 18, 1996Jul 29, 1997Micron Communications, Inc.Thin profile battery
US5654110 *Jun 24, 1996Aug 5, 1997Micron Communications, Inc.Thin profile batteries and methods of forming the same
US5663014 *Jun 4, 1996Sep 2, 1997Micron Communications, Inc.Thin profile battery with improved separator and gasket construction
US5665489 *Nov 22, 1995Sep 9, 1997Micron Communications, Inc.Thin profile batteries with solid electrolyte
US5724720 *Oct 23, 1996Mar 10, 1998Micron Communications, Inc.Methods of forming lithium electrodes
US5730761 *Oct 24, 1996Mar 24, 1998Micron Communications, Inc.Methods of producing thin profile batteries and a plurality of battery terminal housing members
US5789104 *Sep 12, 1997Aug 4, 1998Micron Communications, Inc.Button-type battery with improved separator and gasket construction
US5800865 *Sep 12, 1997Sep 1, 1998Micron Communications, Inc.Thin profile battery with improved separator and gasket construction
US5800943 *Jun 20, 1997Sep 1, 1998Micron Communications, Inc.Fluid tight seal
US5800944 *Sep 12, 1997Sep 1, 1998Micron Communications, Inc.Thin profile battery with improved separator and gasket construction
US5807644 *Feb 26, 1997Sep 15, 1998Micron Communications, Inc.Thin profile battery
US5843596 *Oct 11, 1996Dec 1, 1998Micron Communications, Inc.Methods of forming button type batteries and to button type battery insulating and sealing gaskets
US5849044 *Jul 2, 1996Dec 15, 1998Micron Communications, Inc.Method of forming thin profile batteries
US5851244 *Jul 3, 1997Dec 22, 1998Micron Communications, Inc.methods of forming thin profile batteries and methods of providing sealing gaskets between battery terminal housing members
US5866277 *Jun 3, 1997Feb 2, 1999Micron Communications, Inc.Button type battery with improved separator and gasket construction
US5893207 *Jul 10, 1997Apr 13, 1999Micron Communications, Inc.Method of forming a thin-profile battery
US5919274 *Jun 15, 1998Jul 6, 1999Micron Communications, Inc.Method of forming a thin profile battery
US5952121 *Jun 9, 1998Sep 14, 1999Micron Communications, Inc.Button-type battery with improved separator and gasket construction
US6027829 *Mar 4, 1998Feb 22, 2000Micron Technology, Inc.Conductive first terminal housing member having a surrounding peripheral portion which comprises a transversely projecting peripheral container wall, conductive second terminal housing member, polypropylene gasket; watch batteries
Classifications
U.S. Classification429/174
International ClassificationH01M2/04
Cooperative ClassificationH01M2/0413, Y02E60/12
European ClassificationH01M2/04B2B