CA2273590A1 - Preparation of battery cell current collectors - Google Patents
Preparation of battery cell current collectors Download PDFInfo
- Publication number
- CA2273590A1 CA2273590A1 CA002273590A CA2273590A CA2273590A1 CA 2273590 A1 CA2273590 A1 CA 2273590A1 CA 002273590 A CA002273590 A CA 002273590A CA 2273590 A CA2273590 A CA 2273590A CA 2273590 A1 CA2273590 A1 CA 2273590A1
- Authority
- CA
- Canada
- Prior art keywords
- steel
- casing
- contact surface
- component
- particles
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000002360 preparation method Methods 0.000 title description 2
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 22
- 239000010959 steel Substances 0.000 claims abstract description 22
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000007747 plating Methods 0.000 claims abstract description 19
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052751 metal Inorganic materials 0.000 claims abstract description 15
- 239000002184 metal Substances 0.000 claims abstract description 15
- 239000002245 particle Substances 0.000 claims abstract description 13
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 10
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims abstract description 9
- 238000003754 machining Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 7
- 210000002105 tongue Anatomy 0.000 claims description 7
- 230000007704 transition Effects 0.000 claims description 6
- 230000035515 penetration Effects 0.000 claims description 4
- 229910000990 Ni alloy Inorganic materials 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 239000004020 conductor Substances 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N zinc oxide Inorganic materials [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims 3
- 239000011701 zinc Substances 0.000 claims 2
- 229960001296 zinc oxide Drugs 0.000 claims 2
- SPAGIJMPHSUYSE-UHFFFAOYSA-N Magnesium peroxide Chemical group [Mg+2].[O-][O-] SPAGIJMPHSUYSE-UHFFFAOYSA-N 0.000 claims 1
- 239000000395 magnesium oxide Substances 0.000 claims 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims 1
- 239000011787 zinc oxide Substances 0.000 claims 1
- SZKTYYIADWRVSA-UHFFFAOYSA-N zinc manganese(2+) oxygen(2-) Chemical compound [O--].[O--].[Mn++].[Zn++] SZKTYYIADWRVSA-UHFFFAOYSA-N 0.000 abstract description 2
- 230000001939 inductive effect Effects 0.000 abstract 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910002804 graphite Inorganic materials 0.000 description 4
- 239000010439 graphite Substances 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 150000002739 metals Chemical class 0.000 description 4
- 230000005012 migration Effects 0.000 description 4
- 238000013508 migration Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- -1 iron ion Chemical class 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910001448 ferrous ion Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/669—Steels
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/552—Terminals characterised by their shape
- H01M50/559—Terminals adapted for cells having curved cross-section, e.g. round, elliptic or button cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/70—Carriers or collectors characterised by shape or form
-
- 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
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/117—Inorganic material
- H01M50/119—Metals
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/545—Terminals formed by the casing of the cells
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/562—Terminals characterised by the material
-
- 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
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
At least portions of steel battery casings or other current collectors in contact with a manganese dioxide layer in a zinc-manganese dioxide alkaline cell present to that layer surfaces which have been burnished in the presence of particles of a passivity inducing metal such as nickel.
Typically, the particles are transferred from a plating layer on a surface of low carbon steel forming the casing by a machining operation which cuts into the surface to increase its surface area whilst burnishing the cut surfaces.
Typically, the particles are transferred from a plating layer on a surface of low carbon steel forming the casing by a machining operation which cuts into the surface to increase its surface area whilst burnishing the cut surfaces.
Description
This invention relates to the preparation of battery cell current collectors, particularly casings for alkaline zinc manganese dioxide cells.
Such casings are conventionally cylindrical vessels deep drawn from blanks cut from low carbon steel strip provided with a nickel or nickel based plating to protect the mild steel.
A problem in such battery cells is maintaining intimate contact between the current collector formed by the casing and a manganese dioxide electrode proper, formed by pressing a manganese dioxide paste, rendered electrically conductive by the admixture of graphite, into the casing. Various measures have been proposed with a view to improving and maintaining this contact. For example, the casings may be internally dusted with powdered graphite prior to introduction of the paste, or techniques may be adopted to increase the contact area of the internal surface of the plate. In Japanese Patent Publication No. 58-209056 (Matsushita Electric), the inner surface of a battery casing is grooved to improve its surface area and contact with the paste.
In our published International patent application W098/20572, there is disclosed a technique for improving the interface between the surface of a current collector or electrode and an adjacent layer of material in an electrochemical cell by displacing projecting tongues of collector or material from troughs formed in the surface, the troughs and projections forming a transition zone between the collector of electrode and the adjacent material which both increases the contact area and assists in maintaining physical contact between the layers. This application is more specifically directed to an electrode of an electrochemical cell which comprises a first component of conductive material presenting a surface having an array of separate elongated channels formed in the surface.
of the component without penetrating it, and an array of integral tongues or flanges rooted adjacent the channel and extending away from the surface so as to present surfaces facing both towards and away from the surface, and a second component extending generally parallel to the first component, the tongues or flanges engaging material formed from the second component in a transition zone without extending beyond said second component, such as to provide physical, electrical and thermal coupling between the components.
An apparent problem with this technique and other techniques involving deforming the inside surface of a battery casing as described above is that it destroys the integrity of the plating of the inside surface of the casing and thus exposes the mild steel to chemical action which may result in migration of emissions. This is presumably why the Japanese application referenced above contemplates plating the casing after deformation of its inside surface. In order to address this problem, we have proposed a technique in which a battery casing is impacted at multiple sties on its exterior surface to form internal projections on which the plating is preserved.
Surprisingly, we have now found that displacing metal from the inside surface of the casing to form projections and recesses in its inside surface, such as to increase the area of the inside surface and set up a transition zone between the casing and the adjacent paste, by a machining operation which involves penetration of a plating layer, does not necessarily result in loss of protection of the steel, provided the machining operation utilized is such as to carry plating material onto exposed surfaces of the steel generated by the operation and burnish the latter such as to modify the structure of the steel and incorporate therein traces of the plating metal such as to produce a surface resistant to ferrous ion migration.
Such casings are conventionally cylindrical vessels deep drawn from blanks cut from low carbon steel strip provided with a nickel or nickel based plating to protect the mild steel.
A problem in such battery cells is maintaining intimate contact between the current collector formed by the casing and a manganese dioxide electrode proper, formed by pressing a manganese dioxide paste, rendered electrically conductive by the admixture of graphite, into the casing. Various measures have been proposed with a view to improving and maintaining this contact. For example, the casings may be internally dusted with powdered graphite prior to introduction of the paste, or techniques may be adopted to increase the contact area of the internal surface of the plate. In Japanese Patent Publication No. 58-209056 (Matsushita Electric), the inner surface of a battery casing is grooved to improve its surface area and contact with the paste.
In our published International patent application W098/20572, there is disclosed a technique for improving the interface between the surface of a current collector or electrode and an adjacent layer of material in an electrochemical cell by displacing projecting tongues of collector or material from troughs formed in the surface, the troughs and projections forming a transition zone between the collector of electrode and the adjacent material which both increases the contact area and assists in maintaining physical contact between the layers. This application is more specifically directed to an electrode of an electrochemical cell which comprises a first component of conductive material presenting a surface having an array of separate elongated channels formed in the surface.
of the component without penetrating it, and an array of integral tongues or flanges rooted adjacent the channel and extending away from the surface so as to present surfaces facing both towards and away from the surface, and a second component extending generally parallel to the first component, the tongues or flanges engaging material formed from the second component in a transition zone without extending beyond said second component, such as to provide physical, electrical and thermal coupling between the components.
An apparent problem with this technique and other techniques involving deforming the inside surface of a battery casing as described above is that it destroys the integrity of the plating of the inside surface of the casing and thus exposes the mild steel to chemical action which may result in migration of emissions. This is presumably why the Japanese application referenced above contemplates plating the casing after deformation of its inside surface. In order to address this problem, we have proposed a technique in which a battery casing is impacted at multiple sties on its exterior surface to form internal projections on which the plating is preserved.
Surprisingly, we have now found that displacing metal from the inside surface of the casing to form projections and recesses in its inside surface, such as to increase the area of the inside surface and set up a transition zone between the casing and the adjacent paste, by a machining operation which involves penetration of a plating layer, does not necessarily result in loss of protection of the steel, provided the machining operation utilized is such as to carry plating material onto exposed surfaces of the steel generated by the operation and burnish the latter such as to modify the structure of the steel and incorporate therein traces of the plating metal such as to produce a surface resistant to ferrous ion migration.
In order for this to occur the machining operation must be such that surfaces of openings in the plated surface formed by a tool used in the operation are smeared with plating material carried onto the exposed steel, and the exposed steel is burnished in the presence of such material by sliding contact under pressure with the tool surface. If the casing has been dusted with the graphite particles, these may also be embedded in the exposed surfaces by the burnishing operation.
The invention is described further below with reference to the accompanying drawing, in which the sole figure is a fragmentary sectional view of part of a battery casing in contact with a manganesed dioxide composition.
Methods suitable for treating surfaces of metallic current collectors which can provide the above smearing and burnishing effect when applied to plated surfaces of mild steel are disclosed in our published international applications W098/20572 and W099/25040.
Because of concerns as to the effect of penetration of plated surfaces by the processes described in these applications, we carried out a microscopic examination of the cut surfaces which demonstrated the modification of grain boundaries in the exposed steel surfaces associated with burnishing as well as the presence of particles of plating material. We further tested the susceptibility of the burnished surfaces to corrosion in the presence of air and moisture as compared to exposed steel surfaces not so burnished. While the unburnished surfaces showed rapid rust formation, no rusting of the burnished surfaces was observed, indicating a substantial resistance to iron ion migration.
It is believed that the burnishing treatment in the presence of particles of metals such as nickel and chromium and other metals, which are known to produce passivity in steels, produces a thin surface layer on the steel having a passivity somewhat similar to that encountered in stainless steels which incorporate such metals as alloying elements, and which inhibits iron ion migration, and that this constitutes an effective replacement for the protection afforded by conventional plating.
As an alternative or additional to providing metal such as nickel to the surface of the steel by transfer from existing plating, the metal could be applied as a very fine powder, or by other metal deposition methods such as spluttering.
Although the invention has been described primarily with reference to cylindrical battery cases, other forms of positive current collector used in alkali cells could also be similarly treated. Moreover, although the burnishing techniques described above burnish only exposed portions of otherwise plate surfaces, it may be possible to dispense with conventional plating if the entire surface of the steel collector is burnished in the presence of particles of a suitable metal or alloy providing passivity such as might otherwise be used for plating. This could have the advantage of reducing the amounts of such metals used in alkaline cells, with environmental and cost benefits.
In the appended drawing showing a fragmentary section through a portion of an exemplary steel battery casing 2, an inside surface of the casing has been machined to plane projecting tongues 4 curling away from recesses 8 which extend into a layer 6 of manganese dioxide composition formed from a paste of manganese dioxide containing graphite to form a transition zone 9 between the casing and the composition. The original surfaces of the casing are plated with nickel or nickel alloy, and this plating is preserved on the surfaces 5, whereas the machining process results in the recesses 8 and the surfaces 7 presenting raw steel. However, the action of blades on the tool producing the machining as they deform and slide over the raw steel surfaces carries particles of plating onto those surfaces and burnishes the surfaces in the presence of the particles so as to produce passivity of the latter.
The invention is described further below with reference to the accompanying drawing, in which the sole figure is a fragmentary sectional view of part of a battery casing in contact with a manganesed dioxide composition.
Methods suitable for treating surfaces of metallic current collectors which can provide the above smearing and burnishing effect when applied to plated surfaces of mild steel are disclosed in our published international applications W098/20572 and W099/25040.
Because of concerns as to the effect of penetration of plated surfaces by the processes described in these applications, we carried out a microscopic examination of the cut surfaces which demonstrated the modification of grain boundaries in the exposed steel surfaces associated with burnishing as well as the presence of particles of plating material. We further tested the susceptibility of the burnished surfaces to corrosion in the presence of air and moisture as compared to exposed steel surfaces not so burnished. While the unburnished surfaces showed rapid rust formation, no rusting of the burnished surfaces was observed, indicating a substantial resistance to iron ion migration.
It is believed that the burnishing treatment in the presence of particles of metals such as nickel and chromium and other metals, which are known to produce passivity in steels, produces a thin surface layer on the steel having a passivity somewhat similar to that encountered in stainless steels which incorporate such metals as alloying elements, and which inhibits iron ion migration, and that this constitutes an effective replacement for the protection afforded by conventional plating.
As an alternative or additional to providing metal such as nickel to the surface of the steel by transfer from existing plating, the metal could be applied as a very fine powder, or by other metal deposition methods such as spluttering.
Although the invention has been described primarily with reference to cylindrical battery cases, other forms of positive current collector used in alkali cells could also be similarly treated. Moreover, although the burnishing techniques described above burnish only exposed portions of otherwise plate surfaces, it may be possible to dispense with conventional plating if the entire surface of the steel collector is burnished in the presence of particles of a suitable metal or alloy providing passivity such as might otherwise be used for plating. This could have the advantage of reducing the amounts of such metals used in alkaline cells, with environmental and cost benefits.
In the appended drawing showing a fragmentary section through a portion of an exemplary steel battery casing 2, an inside surface of the casing has been machined to plane projecting tongues 4 curling away from recesses 8 which extend into a layer 6 of manganese dioxide composition formed from a paste of manganese dioxide containing graphite to form a transition zone 9 between the casing and the composition. The original surfaces of the casing are plated with nickel or nickel alloy, and this plating is preserved on the surfaces 5, whereas the machining process results in the recesses 8 and the surfaces 7 presenting raw steel. However, the action of blades on the tool producing the machining as they deform and slide over the raw steel surfaces carries particles of plating onto those surfaces and burnishes the surfaces in the presence of the particles so as to produce passivity of the latter.
Claims (10)
1. A method for treating a steel current collector for a positive electrode in an alkaline zinc/manganese dioxide cell, the collector having a contact surface intended to contact a manganese dioxide composition, wherein at least a part of that surface is an exposed steel surface and is burnished in the presence of particles of a metal imparting passivity to the contact surface.
2. A method according to claim 1, wherein the current collector is a cylindrical casing deep drawn from low carbon steel, and the contact surface is the inside surface of the casing.
3. A method according to claim 1 or 2, wherein the passivity imparting metal is nickel or a nickel alloy.
4. A method according to any of claims 1, 2 or 3, wherein the exposed steel surface is formed by a machining process which increases the surface area of the contact surface.
5. A method according to claim 4, wherein the particles of passivity imparting metal are transferred to the exposed steel surface by the machining process from a plating layer of that metal previously applied to the contact surface.
6. A steel current collector for use in the positive electrode of an alkaline zinc/manganese dioxide cell, having a contact surface for contact with a manganese dioxide composition at least part of which contact surface is raw steel burnished in the presence of particles of a passivating metal.
7. A current collector according to claim 6, wherein the current collector is a cylindrical battery casing deep drawn from low carbon steel, the contact surface being the inside of the casing.
8. A battery cell incorporating a current collector according to claim 7.
9. A battery cell according to claim 8, wherein the casing is drawn from low carbon steel plated with nickel or a nickel alloy to form a plated contact surface, the plated contact surface has multiple penetrations and is deformed to increase its surface area and the depth of a transition zone between the casing and a layer of manganese dioxide composition adjacent the casing, and surfaces of the steel exposed by the penetrations have been burnished in the presence of particles of plating smeared onto those surfaces.
10. An electrode of an electrochemical cell which comprises a first component of conductive material presenting a surface having an array of separate elongated channels formed in the surface of the component without penetrating it, and an array of integral tongues or flanges rooted adjacent the channel and extending away from the surfaces so as to present surfaces facing both towards and away from the surface, and a second component extending generally parallel to the first component, the tongues or flanges engaging material formed the second component in a transition zone without extending beyond said second component, such as to provide physical, electrical and thermal coupling between the components;
wherein the first component is of low carbon steel, plated with nickel or a nickel-rich alloy, the second component is a magnesium dioxide composition, the cell is a zinc/magnesium oxide alkaline cell, and the surfaces of the channels and the surfaces of the tongues or flanges facing the channels at their roots are burnished in the presence of particles of the plating wiped on to said surfaces during their formation.
wherein the first component is of low carbon steel, plated with nickel or a nickel-rich alloy, the second component is a magnesium dioxide composition, the cell is a zinc/magnesium oxide alkaline cell, and the surfaces of the channels and the surfaces of the tongues or flanges facing the channels at their roots are burnished in the presence of particles of the plating wiped on to said surfaces during their formation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002273590A CA2273590A1 (en) | 1999-06-02 | 1999-06-02 | Preparation of battery cell current collectors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002273590A CA2273590A1 (en) | 1999-06-02 | 1999-06-02 | Preparation of battery cell current collectors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2273590A1 true CA2273590A1 (en) | 2000-12-02 |
Family
ID=30774262
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002273590A Abandoned CA2273590A1 (en) | 1999-06-02 | 1999-06-02 | Preparation of battery cell current collectors |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2273590A1 (en) |
-
1999
- 1999-06-02 CA CA002273590A patent/CA2273590A1/en not_active Abandoned
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |