US3823039A - Sealing closure for electric batteries - Google Patents

Sealing closure for electric batteries Download PDF

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Publication number
US3823039A
US3823039A US00269088A US26908872A US3823039A US 3823039 A US3823039 A US 3823039A US 00269088 A US00269088 A US 00269088A US 26908872 A US26908872 A US 26908872A US 3823039 A US3823039 A US 3823039A
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United States
Prior art keywords
tray
base
projection
annular
zone
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Expired - Lifetime
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US00269088A
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D Sanchez
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Pilas Secas Jupiter SA
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Pilas Secas Jupiter SA
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/182—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for cells with a collector centrally disposed in the active mass, e.g. Leclanché cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • a battery forms water during its discharge at the same time as its electrolytic paste or electrolytic bridge between anode and cathode retrogresses.
  • the pressure inside the closed container constituting the battery is raised, and this is further enhanced by the increase of heat produced by the chemical reactions taking place.
  • This has the effect that because of its higher pressure in relation to atmospheric pressure the liquid tends to escape at moments when its formation is greatest, and it is consequently necessary that the battery should at all times withstand this combined internal pressure of the gas and the liquid, since subsequently the liquid formed will react chemically with solid products, forming chemically complex substances and to a large extent re-absorbing the original liquid.
  • the device according to the present invention is essentially characterized in that the zinc tube or anode of the battery has a negative current collector tray having a base with an upwardly extending lip peripherally fastened to the bottom thereof in order to make electric contact.
  • the base of the tray has a zig-zag cross-section formed by a downwardly and outwardly extending annular projection formed of a first annular flange extending downwardly and outwardly at an acute angle to the horizontal and a second annular flange extending inwardly and upwardly from the lower extremity of the first annular flange at an acute angle to the first annular flange and the horizontal.
  • FIGS. 1 and 2 show two views of the tray, in plan and in profile, respectively;
  • FIG. 3 is a sectional elevation of the hermetic sealing of the bottom of the battery employing the tray of FIGS. 1 and 2;
  • FIG. 4 shows in detail the contraction zone of the heat-sealable material injected into the acute angle of the tray.
  • Metal tray negative pole or cathode device of the battery.
  • Zinc tube (container and anode of the battery).
  • the metal tray 1 has a base with a zig-zag cross-section formed by a downwardly and outwardly extending annular projection formed therein.
  • the annular projection consists of a first annular flange 1a extending downwardly and outwardly at an acute angle 2 from the horizontal, and a second annular flange 1b extending inwardly and upwardly from the lower extremity of the first annular flange at an acute angle to the first annular flange and the horizontal.
  • a central projection or dish-shaped portion 7 extends downwardly from the upper extremity of the second annular flange.
  • an annular lip 10 extends upwardly from the periphery of the base to contact the outer periphery of the bottom portion of zinc tube 5.
  • Thermoplastic material is injected against the annular projection once the tray has been fitted on the bottom of the anode 5 and the outer tubular casing 4 has been fitted thereover. Because of the temperature of the injected material the tubular casing 4 melts at the Zone 8 in contact with the material, so that the two are intimately welded together by fusion. In addition, because of the contraction occurring after cooling following the injection the injected material in the zone 6, contraction of the material in the angles 2 and 3 exerts pressure against the metal tray, so that the battery is hermetically sealed through this pressure on the annular projection. In this manner the liquid and gas formed in the battery are held captive between the metal tray and the thickened zone 6, the latter being shown particularly clearly in FIG. 4, where the directions of the sealing force have been shown by arrows. The contraction force is assisted by the force produced by the swelling of the casing, and the two forces result in tight sealing against the annular projection.
  • the chamber 9 formed between the central projection 7 of the tray and the base of the tube will serve to permit expansion of the gases and liquid produced in the interior of the battery.
  • the aforesaid inner side of the base may be provided with a fine film 10 of anticorrosive product.
  • a base for electric sealed batteries including a tubular anode, a sealing cover surrounding said anode, and a cathode device in contact with said anode and extending outwardly through said cover; the improvement wherein:
  • said cathode device comprises:
  • a metal tray having a base, said base having a zigzag cross-sectional profile formed by a downwardly and outwardly extending annular projection formed of a first annular flange extending downwardly and outwardly at an acute angle from the horizontal, and a second annular flange extending inwardly and upwardly from the lower extremity of said first annular flange at an acute angle to said first annular flange and to the horizontal;
  • annular dish-shaped central projection extending downwardly from the upper extremity of said second annular flange
  • thermoplastic material means inserted between said sealing cover and the bottom surface of said base of said tray for exerting a contracting pressure on said annular projection.
  • thermoplastic material means forms a unitary body rigidly welded to the interior of said sealing cover.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Hybrid Cells (AREA)
  • Prevention Of Electric Corrosion (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

Sealing closure for electric batteries includes, in the bottom of the anode, a metal tray provided on the periphery of its base with a zig-zag cross-sectional profile and in its central zone with a projection to the outside, which is covered internally by a film of anti-corrosive product. The outer zone of the tray surrounding the central projection is provided with a thermoplastic material, leaving free the aforesaid outer central projection of the base of the tray.

Description

July 9, 1974 u. LOPEZ SANCHEZ SEALING CLOSURE FOR ELECTRIC BATTERIES P1106 July 5. 1972 FIG. 1
FIG. 3
United States Patent 3,823,039 SEALING CLOSURE FOR ELECTRIC BATTERIES Demetrio Lopez Sanchez, Madrid, Spain, assiguor to Pilas Secas Jupiter, S.A., Tolosa, Guipuzcoa, Spain Filed July 5, 1972, Ser. No. 269,088 Claims priority, applicastign Spain, Dec. 24, 1971,
Int. Cl. nolm 1/02 U.S. Cl. 136-133 4 Claims ABSTRACT OF THE DISCLOSURE BACKGROUND OF THE INVENTION The present invention relates to a type of sealed closure for electric batteries, which enables them to be kept free from leaks of corrosive liquid from the commencement of their use until they are exhausted.
There have been tested and put into practice various types of electric batteries which comply with the proposed aim regarding tightness, such as represented by Spanish Utility Models Nos. 125,958; 125,959; 125,960; 125,961; 126,121; 126,122; 126,569; 126,570, and 171,501.
However, the present inventor has conceived a sealed closure which is simpler to produce and gives better results, and which is the object of the present invention.
As is known, a battery forms water during its discharge at the same time as its electrolytic paste or electrolytic bridge between anode and cathode retrogresses. As a result of the combination of these two effects the pressure inside the closed container constituting the battery is raised, and this is further enhanced by the increase of heat produced by the chemical reactions taking place. This has the effect that because of its higher pressure in relation to atmospheric pressure the liquid tends to escape at moments when its formation is greatest, and it is consequently necessary that the battery should at all times withstand this combined internal pressure of the gas and the liquid, since subsequently the liquid formed will react chemically with solid products, forming chemically complex substances and to a large extent re-absorbing the original liquid.
*SUMMARY OF THE INVENTION The device according to the present invention is essentially characterized in that the zinc tube or anode of the battery has a negative current collector tray having a base with an upwardly extending lip peripherally fastened to the bottom thereof in order to make electric contact. The base of the tray has a zig-zag cross-section formed by a downwardly and outwardly extending annular projection formed of a first annular flange extending downwardly and outwardly at an acute angle to the horizontal and a second annular flange extending inwardly and upwardly from the lower extremity of the first annular flange at an acute angle to the first annular flange and the horizontal. Extending downwardly from the upper extremity of the second annular flange, and preferably at a right angle thereto, is a central projection or dished portion extending to the outside and constituting the contact zone of the negative pole, for the utilization of the battery.
3,823,039 Patented July 9, 1974 ice This special form of the tray has the effect that when thermoplastic material is injected around the annular projection, once the outer casing has been fitted, the material contracts against the annular projection of the metallic tray and is welded to the outer tubular casing of heat-sealable material which surrounds the entire battery, thereby ensuring a perfect seal at the base of the electric batteries through the intimate bonding between the outer casing and the material forming a thickened base, and also through the contraction force of the thermoplastic material injected against the annular projection of the tray. The annular projection at an acute angle to the tray anchored in the thermoplastic material constitutes a circular closure or sealing zone because it is under a higher pressure than the pressure formed internally during discharge. At moments of maximum formation of gas and liquid the tubular base tends to swell slightly, its edges acting on the thickened zone being contracted and applying additional closing pressure to the annular acute-angle projection of the tray.
BRIEF DESCRIPTION OF THE DRAWINGS To facilitate the understanding of the invention reference will be made to the following description taken with the accompanying drawings showing one illustrative example, which does not constitute a limitation, and wherein: FIGS. 1 and 2 show two views of the tray, in plan and in profile, respectively; FIG. 3 is a sectional elevation of the hermetic sealing of the bottom of the battery employing the tray of FIGS. 1 and 2; and FIG. 4 shows in detail the contraction zone of the heat-sealable material injected into the acute angle of the tray.
DETAILED DESCRIPTION OF THE INVENTION The various elements have been given the following numerical references in the four figures of the drawings:
1. Metal tray (negative pole or cathode device of the battery).
2. Acute angle of the annular projection of the tray.
3. Right angle of the dished portion of the tray.
4. Outer tubular casing possessing heat-sealing properties.
5. Zinc tube (container and anode of the battery).
6. Thickened zone of the outer base of the battery.
7. Central projection or dished portion of the tray which projects downwardly and outwardly of the cover and constituting the contact zone of the negative pole, for the utilisation of the battery.
8. Welding zone between casing and injected material.
9. Chamber formed between the central projection 7 and the base of zinc tube 5.
10. Anti-corrosive film covering the inside of the base of the metal tray 1.
The metal tray 1 has a base with a zig-zag cross-section formed by a downwardly and outwardly extending annular projection formed therein. The annular projection consists of a first annular flange 1a extending downwardly and outwardly at an acute angle 2 from the horizontal, and a second annular flange 1b extending inwardly and upwardly from the lower extremity of the first annular flange at an acute angle to the first annular flange and the horizontal. A central projection or dish-shaped portion 7 extends downwardly from the upper extremity of the second annular flange. Also an annular lip 10 extends upwardly from the periphery of the base to contact the outer periphery of the bottom portion of zinc tube 5. Thermoplastic material is injected against the annular projection once the tray has been fitted on the bottom of the anode 5 and the outer tubular casing 4 has been fitted thereover. Because of the temperature of the injected material the tubular casing 4 melts at the Zone 8 in contact with the material, so that the two are intimately welded together by fusion. In addition, because of the contraction occurring after cooling following the injection the injected material in the zone 6, contraction of the material in the angles 2 and 3 exerts pressure against the metal tray, so that the battery is hermetically sealed through this pressure on the annular projection. In this manner the liquid and gas formed in the battery are held captive between the metal tray and the thickened zone 6, the latter being shown particularly clearly in FIG. 4, where the directions of the sealing force have been shown by arrows. The contraction force is assisted by the force produced by the swelling of the casing, and the two forces result in tight sealing against the annular projection.
In addition, the chamber 9 formed between the central projection 7 of the tray and the base of the tube will serve to permit expansion of the gases and liquid produced in the interior of the battery. In order to prevent the corrosion of the inside of the base of the metal tray through the action of this corrosion liquid, the aforesaid inner side of the base may be provided with a fine film 10 of anticorrosive product.
The above are the essential characteristics of the invention, the scope of protection of which includes all those modifications of details which do not change, alter, or modify the essential nature of the invention.
I claim:
1. In a base for electric sealed batteries including a tubular anode, a sealing cover surrounding said anode, and a cathode device in contact with said anode and extending outwardly through said cover; the improvement wherein:
said cathode device comprises:
a metal tray having a base, said base having a zigzag cross-sectional profile formed by a downwardly and outwardly extending annular projection formed of a first annular flange extending downwardly and outwardly at an acute angle from the horizontal, and a second annular flange extending inwardly and upwardly from the lower extremity of said first annular flange at an acute angle to said first annular flange and to the horizontal;
an annular dish-shaped central projection extending downwardly from the upper extremity of said second annular flange;
an annular lip extending upwardly from the outer periphery of said base, said lip being in contact with said tubular anode about the periphery of the bottom portion thereof; and
there being an expansion chamber formed by said central projection between said tray and the bottom of said anode.
2. The improvement claimed in claim 1, wherein said central projection extends downwardly at a substantially right angle to said second annular flange.
3. The improvement claimed in claim 1, further comprising thermoplastic material means inserted between said sealing cover and the bottom surface of said base of said tray for exerting a contracting pressure on said annular projection.
4. The improvement claimed in claim 3, wherein said thermoplastic material means forms a unitary body rigidly welded to the interior of said sealing cover.
References Cited UNITED STATES PATENTS 3,573,990 4/1971 Tsuchida et al. 136133 3,185,594 5/1965 Urry 136-107 2,996,565 8/1961 Ning 136-132 3,433,681 3/1969 Iammet 136-133 3,457,117 7/1969 Angelovich 136-433 ANTHONY SKAPARS, Primary Examiner US. Cl. X.R. 136-469
US00269088A 1971-12-24 1972-07-05 Sealing closure for electric batteries Expired - Lifetime US3823039A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ES1971175654U ES175654Y (en) 1971-12-24 1971-12-24 WATERPROOF CLOSURE FOR ELECTRIC BATTERIES.

Publications (1)

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US3823039A true US3823039A (en) 1974-07-09

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JP (1) JPS4872629A (en)
DE (1) DE2230772C3 (en)
ES (1) ES175654Y (en)
FR (1) FR2164553B1 (en)
GB (1) GB1361932A (en)
IT (1) IT962808B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3951690A (en) * 1971-08-05 1976-04-20 Pilas Secas Juipter S.A. Base for leakproof electrochemical cells and method of forming the same
US5750283A (en) * 1994-08-24 1998-05-12 Duracell Inc. Seal for electrochemical cell
US5759713A (en) * 1994-08-24 1998-06-02 Duracell, Inc. Upward deflecting support disk for electrochemical cell seal
US20120177984A1 (en) * 2011-01-10 2012-07-12 Jaewook Lee Case for Battery and Secondary Battery Including the Case

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2015916B (en) * 1978-03-13 1982-06-09 Clint Inc Compression moulding

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS423381Y1 (en) * 1965-02-06 1967-02-28

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3951690A (en) * 1971-08-05 1976-04-20 Pilas Secas Juipter S.A. Base for leakproof electrochemical cells and method of forming the same
US5750283A (en) * 1994-08-24 1998-05-12 Duracell Inc. Seal for electrochemical cell
US5759713A (en) * 1994-08-24 1998-06-02 Duracell, Inc. Upward deflecting support disk for electrochemical cell seal
US20120177984A1 (en) * 2011-01-10 2012-07-12 Jaewook Lee Case for Battery and Secondary Battery Including the Case
US9088013B2 (en) * 2011-01-10 2015-07-21 Samsung Sdi Co., Ltd. Case for battery comprising bent edge and seal, and secondary battery including the case

Also Published As

Publication number Publication date
IT962808B (en) 1973-12-31
ES175654U (en) 1972-06-16
FR2164553B1 (en) 1976-03-12
DE2230772A1 (en) 1973-07-05
FR2164553A1 (en) 1973-08-03
DE2230772B2 (en) 1980-02-28
GB1361932A (en) 1974-07-30
ES175654Y (en) 1972-12-16
JPS4872629A (en) 1973-10-01
DE2230772C3 (en) 1980-10-30

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