GB2110464A - Electrically conductive component - Google Patents
Electrically conductive component Download PDFInfo
- Publication number
- GB2110464A GB2110464A GB08134836A GB8134836A GB2110464A GB 2110464 A GB2110464 A GB 2110464A GB 08134836 A GB08134836 A GB 08134836A GB 8134836 A GB8134836 A GB 8134836A GB 2110464 A GB2110464 A GB 2110464A
- Authority
- GB
- United Kingdom
- Prior art keywords
- battery
- roughened
- component
- pressing
- housing
- 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.)
- Withdrawn
Links
- 238000003825 pressing Methods 0.000 claims abstract description 46
- 239000003792 electrolyte Substances 0.000 claims abstract description 18
- 238000009760 electrical discharge machining Methods 0.000 claims abstract description 4
- 239000002184 metal Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 125000006850 spacer group Chemical group 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 10
- 239000010935 stainless steel Substances 0.000 abstract description 10
- 210000000707 wrist Anatomy 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 5
- 238000007788 roughening Methods 0.000 description 5
- 239000011324 bead Substances 0.000 description 4
- 210000003414 extremity Anatomy 0.000 description 4
- 230000003746 surface roughness Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 235000011837 pasties Nutrition 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- DOSMHBDKKKMIEF-UHFFFAOYSA-N 2-[3-(diethylamino)-6-diethylazaniumylidenexanthen-9-yl]-5-[3-[3-[4-(1-methylindol-3-yl)-2,5-dioxopyrrol-3-yl]indol-1-yl]propylsulfamoyl]benzenesulfonate Chemical compound C1=CC(=[N+](CC)CC)C=C2OC3=CC(N(CC)CC)=CC=C3C(C=3C(=CC(=CC=3)S(=O)(=O)NCCCN3C4=CC=CC=C4C(C=4C(NC(=O)C=4C=4C5=CC=CC=C5N(C)C=4)=O)=C3)S([O-])(=O)=O)=C21 DOSMHBDKKKMIEF-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- 238000003466 welding Methods 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
- H01M4/70—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
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/109—Primary casings; Jackets or wrappings characterised by their shape or physical structure of button or coin shape
-
- 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)
- Primary Cells (AREA)
Abstract
A button battery for e.g. an electrically powered wrist watch has the two pressings 17 of its outer housing formed from stainless steel having a substantially smooth surface finish. In order to provide good electrical contact with the electrolyte structure of the battery the base of each housing is roughened by stamping with a press tool surface roughened by spark erosion. <IMAGE>
Description
SPECIFICATION
Electrically conductive component
This invention relates to dry batteries, in particular (but not exclusively) button batteries for use in electrically powered wrist watches and other electrically powered devices.
Button batteries conventionally have a housing formed by two similar metal pressings having a flat base and an upturned peripheral rim, the pressings being disposed with their rims concentric and separated by an insulating spacer formed by a sleeve of insulating material. The housing acts as a container for the electrolyte structure of the battery; moreover, the pressings form the two battery electrodes, and for that purpose are each required to make good electrical contact with the electrolyte structure. In this respect it will be understood that the electrolyte structure is generally in the form of a nonhomogeneous pasty mass in contact with the electrodes at each end.
For corrosion resistance the pressings are conventionally made from stainless steel sheet, but because of the smooth surface which this material normally presents it has hitherto been the practice to spot weld a disc of stainless steel mesh to the base of each pressing within the housing; in this way the surface area presented by the pressing to the electrolyte structure is increased, and a secure, low-resistance electrical contact between them can be achieved.
However, the provision of the discs and their location and attachment to the pressings represent a substantial production cost of the button battery as a whole, and it is one object of the present invention to provide a pressing for the housing of a button battery which has no such disc and yet which is nevertheless capable of making a satisfactory electrical contact with the electrolyte structure of the assembled battery.In accordance with the invention from a first aspect, therefore, there is provided an electrically conductive component for the housing of a dry battery, the component being intended to make electrical contact with the electrolyte structure of the battery but being formed from metal sheet having a substantially smooth surface finish, at least a substantial part of the component at the interior surface thereof being roughened by stamping with a roughened surface of a press tool.
In accordance with the invention from a second aspect there is provided a dry battery having a housing which comprises an electrically conductive component intended to make electrical contact with the electrolyte structure of the battery but formed from metal sheet having a substantially smooth surface finish, at least a substantial part of the component at the interior surface thereof being roughened by stamping with a roughened surface of a press tool.
In accordance with the invention from a third aspect there is provided a method of forming an electrically conductive component for the housing of a dry battery intended to make electrical contact with the electrolyte structure of the battery, which comprises forming the component from metal sheet having a substantially smooth surface finish, at least a substantial part of the component at the interior surface thereof being roughened by stamping with a roughened surface of a press tool.
The roughening of the surface of the press tool is preferably effected by spark erosion, although other treatments, chemical or otherwise, are possible. Where a drawing and/or stamping operation is used to create the component from its parent sheet, the roughening is preferably achieved in the same operation as the creation of the component, by the same press tool.
The roughening of the component is preferably such as to give a surface roughness reading of at least 100 when measured by a 'Talysurf' surface smoothness testing machine. By way of comparison, the stainless steel which is conventionally used for the pressings of button battery housings has a surface roughness reading of less than 10, and typically 1-2, on the above machine.
In order that the invention may be more fully understood, a button battery in accordance with the invention will now be described, by way of example and with reference to the accompanying drawings. In the drawings Figure 1 diagrammatically shows the button battery in enlarged diametral cross-section;
Figure 2 is an enlarged plan view showing the interior of a pressing for a button battery housing as at present commercially available;
Figure 3 is a plan view similar to Figure 2 of a pressing in accordance with the invention;
Figure 4 diagrammatically shows the arrangement of tooling by which the pressing of
Figure 3 may be formed; and
Figure 5 shows a detail of the tooling.
Referring now to Figure 1, a button battery for a wrist watch, hearing aid, camera or like electrically powered device has a circular housing
10 within which is contained an electrolyte structure 1 1 generally formed of a nonhomogeneous pasty mass.
The housing 10 is formed of two similar pressings 1 5A, 1 5B made from stainless steel sheet which on both sides has a surface roughness tyipcally of 1 -2( xl 0-5 ins) as
measured by a 'Talysurf' surface smoothness testing machine. Each pressing 15 has a flat base
16 and a shallow cylindrical rim 17 upstanding
peripherally and integrally around the base. The
pressing 1 5A has a larger diameter than the
pressing 1 58.
The pressings are disposed with their bases 16
in parallel relation and with their rims 17 mutually
concentric, the rim of the pressing 1 5B being
disposed within, and in partially overlapped
relation to, that of the pressing 1 5A.
A spacing sleeve 18 of a suitable
thermoplastics or thermosetting material (e.g.
high density polyethylene, polypropylene or nylon) attaches the pressings together as a liquid and gas-tight enclosure for the electrolyte structure 1 whilst insulating pressings electrically from one another.
The sleeve 18 is generally L-shaped in crosssection, having a longer limb 19 which separates the rims 17, and a shorter limb 20 which separates the free edge of the innermost rim 17 from the adjacent base 16 of the pressing 1 so. It will therefore be seen that the shorter limb accurately determines the thickness of the battery; its own material thickness is chosen accordingly.
The pressings are attached together through the agency of the sleeve 1 8. After the pressings have been assembled together with the sleeve between them, a bead (not shown) is rolled in the rim 1 7 of the pressing 1 5A in correspondence with a preformed bead (not shown) in the rim of the pressing 1 5B. The deformation of the sleeve into the inner bead, and the engagement of the outer bead in the deformity, serve to lock the pressings firmly together but in an insulating manner.
In use of the battery the pressings 15 are required to act as the positive and negative battery electrodes. However, the stainless steel of which they are made is substantially smooth, and in order to ensure a secure and low-resistance connection with the electrolyte structure the internal surfaces of their bases 16 are provided with means for increasing the surface area which they present to the electrolyte structure 1 1. In
Figure 1 these means are generally represented by thick lines and denoted by the reference numeral 21.
Figure 2 shows one of the pressings 1 5A in a button battery which is currently marketed in UK.
The means 21 of the pressing is provided by a circular disc 21A of stainless steel mesh which is centrally located against the inside surface of the base 16 and attached to it by spot welding at a number of discrete points 22.
The disc 21A is located centrally in relation to the pressing, and has a diameter such as to leave a surrounding annular space 23 at which the shorter limb 20 of the spacing sleeve 1 8 may closely engage the base 16. It will be appreciated that the formation of the disc and its location and
attachment on the base represent substantial
material and production costs. Although not
shown, it is to be understood that the pressing
1 5B for the battery is similarly provided with a
stainless steel disc 21A; an annular space 23 may
however, be absent from this pressing.
Figure 3 shows one of the pressings 1 5 for a
button battery in accordance with the invention.
Instead of the separately provided disc 21A the
pressing has a corresponding region 21B over
which the internal surface of the base is
roughened to provide asperities by which the
effective surface area of the base is increased. As
before, an annular clearance 23 may be provided for the spacing sleeve 1 8 to engage the base. The
roughness of the stainless steel at the region 21B is at least, 1 00x 10-5 ins and is typically
125x 10-5 ins, as measured by a Talysurf surface smoothness testing machine.
Figure 4 diagrammatically shows press tooling by which the pressing 15 of Figure 3 may be formed from a precut disc 25 of the parent (unroughened) stainless steel sheet. The tooling comprises a stationary female die member 26 having a cavity 27, and a punch 28 with a head 29 to force the disc into the cavity and so form it by a drawing operation with the base 16 and drawn rim 17. If desired a clamping ring 30 may be provided and arranged to lightly clamp the disc around the periphery of the head 29 and so provide peripheral restraint for the disc as drawing proceeds. The dimensions of the cavity 27 and head 29 are such that during the drawing operation they are separated by an annular clearance which is slightly greater than the material thickness of the disc 25.
The cavity 27 has a bottom defined by a member 31 arranged to eject the pressing upwardly from the cavity after the drawing operation has been completed. At the end of the drawing operation the member 31 also serves as an anvil for the head 29 to form the roughened region 21B (Figure 3) on the inside (i.e. upper) surface of the base of the pressing.
The head 29 is shown in underplan view in
Figure 5, in which it will be seen that its undersurface is provided by a roughened central region 32, and a smooth annular margin 33 which is relieved in relation to the central region by approximately the depth of the asperities with which the central region is formed. The central region 32 of the head forms the roughening of the region 21 B of the pressing base, the annular margin 33 corresponding to the annular clearance 23, which is accordingly unroughened. If desired the whole of the bottom surface of the head 29, and accordingly the whole of the pressing base, may be roughened.
The roughening of the central region 32 is preferably achieved by spark erosion before the head is fitted into position; however, other methods, chemical or otherwise, may be used. In one alternative, molten metal is sputtered onto the head.
Although of particular application to button batteries, the invention may be applied to other dry batteries having housing components which are electrically conductive and intended to make electrical contact with the electrolyte structure of the battery, but which are made from metal sheet usually having a substantially smooth surface finish.
Claims (7)
1. An electrically conductive component for the housing of a dry battery, the component being intended to make electrical contact with the electrolyte structure of the battery but being formed from metal sheet having a substantially smooth surface finish, at least a substantial part of the component at the interior surface thereof being roughened by stamping with a roughened surface of a press tool.
2. A dry battery having a housing which comprises an electrically conductive component intended to make electrical contact with the electrolyte structure of the battery but formed from metal sheet having a substantially smooth surface finish, at least a substantial part of the component at the interior surface thereof being roughened by stamping with a roughened surface of a press tool.
3. A button battery having a housing comprising two pressings each formed with a base and peripheral rim, and a spacer attaching the pressings together whilst insulating them electrically from one another, each pressing being intended to make electrical contact with the electrolyte structure of the battery but being formed from metal sheet having a substantially smooth surface finish, at least a substantial part of the pressing at the interior surface thereof being roughened by stamping with a roughened surface of a press tool.
4. A method of forming an electrically conductive component for the housing of a dry battery and intended to make electrical structure with the electrolyte structure of the battery, which comprises forming the component from sheet metal having a substantially smooth surface finish, at least a substantial part of the component at the interior surface thereof being roughened by stamping with a roughened surface of a press tool.
5. A method in accordance with claim 3, wherein the surface of the press tool is roughened by spark erosion.
6. A pressing for a button battery, substantially as hereinbefore described with reference to Figure 3 of the accompanying drawings.
7. A button battery, substantially as hereinbefore described with reference to Figures 1 and 3 of the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08134836A GB2110464A (en) | 1981-11-19 | 1981-11-19 | Electrically conductive component |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08134836A GB2110464A (en) | 1981-11-19 | 1981-11-19 | Electrically conductive component |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2110464A true GB2110464A (en) | 1983-06-15 |
Family
ID=10525989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08134836A Withdrawn GB2110464A (en) | 1981-11-19 | 1981-11-19 | Electrically conductive component |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2110464A (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0751578A1 (en) * | 1995-05-05 | 1997-01-02 | Rayovac Corporation | Metal-air electrochemical cells |
| US5804327A (en) | 1995-05-05 | 1998-09-08 | Rayovac Corporation | Thin walled electrochemical cell |
| US5904998A (en) | 1995-05-05 | 1999-05-18 | Rayovac Corporation | Metal-air cathode can and electrochemical cell made therewith |
| US6040074A (en) * | 1995-05-05 | 2000-03-21 | Rayovac Corporation | Metal-air cathode can, and electrochemical cell made therewith |
| US6205831B1 (en) | 1998-10-08 | 2001-03-27 | Rayovac Corporation | Method for making a cathode can from metal strip |
| US6248463B1 (en) | 1997-05-05 | 2001-06-19 | Rayovac Corporation | Metal-air cathode can and electrochemical cell made therewith |
| US6261709B1 (en) | 1998-03-06 | 2001-07-17 | Rayovac Corporation | Air depolarized electrochemical cell having mass-control chamber in anode |
| US6368738B1 (en) | 1998-03-06 | 2002-04-09 | Rayovac Corporation | Air depolarized electrochemical cell |
| WO2010112332A1 (en) * | 2009-04-04 | 2010-10-07 | Varta Microbattery Gmbh | Button cell without flanging |
| WO2010130480A1 (en) * | 2009-05-09 | 2010-11-18 | Varta Microbattery Gmbh | Button cell and method for production thereof |
| US9496581B2 (en) | 2009-02-09 | 2016-11-15 | Varta Microbattery Gmbh | Button cells and method of producing same |
| US9799858B2 (en) | 2009-06-18 | 2017-10-24 | Varta Microbattery Gmbh | Button cell having winding electrode and method for the production thereof |
-
1981
- 1981-11-19 GB GB08134836A patent/GB2110464A/en not_active Withdrawn
Cited By (38)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6042957A (en) | 1995-05-05 | 2000-03-28 | Rayovac Corporation | Thin walled electrochemical cell |
| US5658356A (en) * | 1995-05-05 | 1997-08-19 | Rayovac Corporation | Metal-air cathode can having reduced corner radius and electrochemical cells made therewith |
| US5804327A (en) | 1995-05-05 | 1998-09-08 | Rayovac Corporation | Thin walled electrochemical cell |
| US5904998A (en) | 1995-05-05 | 1999-05-18 | Rayovac Corporation | Metal-air cathode can and electrochemical cell made therewith |
| US5945234A (en) * | 1995-05-05 | 1999-08-31 | Rayovac Corporation | Metal-air cathode can having reduced corner radius and electrochemical cells made therewith |
| US6040074A (en) * | 1995-05-05 | 2000-03-21 | Rayovac Corporation | Metal-air cathode can, and electrochemical cell made therewith |
| EP0751578A1 (en) * | 1995-05-05 | 1997-01-02 | Rayovac Corporation | Metal-air electrochemical cells |
| US6280876B1 (en) | 1995-05-05 | 2001-08-28 | Rayovac Corporation | Metal-air cathode can having reduced corner and electrochemical cells made therewith |
| US6284400B1 (en) | 1995-05-05 | 2001-09-04 | Rayovac Corporation | Metal-air cathode can, and electrochemical cell made therewith |
| US6248463B1 (en) | 1997-05-05 | 2001-06-19 | Rayovac Corporation | Metal-air cathode can and electrochemical cell made therewith |
| US6261709B1 (en) | 1998-03-06 | 2001-07-17 | Rayovac Corporation | Air depolarized electrochemical cell having mass-control chamber in anode |
| US6368738B1 (en) | 1998-03-06 | 2002-04-09 | Rayovac Corporation | Air depolarized electrochemical cell |
| US6205831B1 (en) | 1998-10-08 | 2001-03-27 | Rayovac Corporation | Method for making a cathode can from metal strip |
| US9799913B2 (en) | 2009-02-09 | 2017-10-24 | Varta Microbattery Gmbh | Button cells and method of producing same |
| US11258092B2 (en) | 2009-02-09 | 2022-02-22 | Varta Microbattery Gmbh | Button cells and method of producing same |
| US11791493B2 (en) | 2009-02-09 | 2023-10-17 | Varta Microbattery Gmbh | Button cells and method of producing same |
| US11276875B2 (en) | 2009-02-09 | 2022-03-15 | Varta Microbattery Gmbh | Button cells and method of producing same |
| US9496581B2 (en) | 2009-02-09 | 2016-11-15 | Varta Microbattery Gmbh | Button cells and method of producing same |
| US11233264B2 (en) | 2009-02-09 | 2022-01-25 | Varta Microbattery Gmbh | Button cells and method of producing same |
| US11233265B2 (en) | 2009-02-09 | 2022-01-25 | Varta Microbattery Gmbh | Button cells and method of producing same |
| US20200185755A1 (en) | 2009-02-09 | 2020-06-11 | Varta Microbattery Gmbh | Button cells and method of producing same |
| US11024869B2 (en) | 2009-02-09 | 2021-06-01 | Varta Microbattery Gmbh | Button cells and method of producing same |
| WO2010112332A1 (en) * | 2009-04-04 | 2010-10-07 | Varta Microbattery Gmbh | Button cell without flanging |
| CN102460768A (en) * | 2009-04-04 | 2012-05-16 | 瓦尔达微电池有限责任公司 | Button cell without flanging |
| US8586232B2 (en) | 2009-04-04 | 2013-11-19 | Varta Microbattery Gmbh | Button cell without flanging and method of making same |
| WO2010130480A1 (en) * | 2009-05-09 | 2010-11-18 | Varta Microbattery Gmbh | Button cell and method for production thereof |
| US9799858B2 (en) | 2009-06-18 | 2017-10-24 | Varta Microbattery Gmbh | Button cell having winding electrode and method for the production thereof |
| US10804506B2 (en) | 2009-06-18 | 2020-10-13 | Varta Microbattery Gmbh | Button cell having winding electrode and method for the production thereof |
| US11158896B2 (en) | 2009-06-18 | 2021-10-26 | Varta Microbattery Gmbh | Button cell having winding electrode and method for the production thereof |
| US11217844B2 (en) | 2009-06-18 | 2022-01-04 | Varta Microbattery Gmbh | Button cell having winding electrode and method for the production thereof |
| US10971776B2 (en) | 2009-06-18 | 2021-04-06 | Varta Microbattery Gmbh | Button cell having winding electrode and method for the production thereof |
| US11024907B1 (en) | 2009-06-18 | 2021-06-01 | Varta Microbattery Gmbh | Button cell having winding electrode and method for the production thereof |
| US11024906B2 (en) | 2009-06-18 | 2021-06-01 | Varta Microbattery Gmbh | Button cell having winding electrode and method for the production thereof |
| US11024904B2 (en) | 2009-06-18 | 2021-06-01 | Varta Microbattery Gmbh | Button cell having winding electrode and method for the production thereof |
| US11362384B2 (en) | 2009-06-18 | 2022-06-14 | Varta Microbattery Gmbh | Button cell having winding electrode and method for the production thereof |
| US11362385B2 (en) | 2009-06-18 | 2022-06-14 | Varta Microbattery Gmbh | Button cell having winding electrode and method for the production thereof |
| US11791512B2 (en) | 2009-06-18 | 2023-10-17 | Varta Microbattery Gmbh | Button cell having winding electrode and method for the production thereof |
| US11024905B2 (en) | 2009-06-18 | 2021-06-01 | Varta Microbattery Gmbh | Button cell having winding electrode and method for the production thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |