IE48530B1 - Lead accumulators and negative electrodes therefor - Google Patents
Lead accumulators and negative electrodes thereforInfo
- Publication number
- IE48530B1 IE48530B1 IE1362/79A IE136279A IE48530B1 IE 48530 B1 IE48530 B1 IE 48530B1 IE 1362/79 A IE1362/79 A IE 1362/79A IE 136279 A IE136279 A IE 136279A IE 48530 B1 IE48530 B1 IE 48530B1
- Authority
- IE
- Ireland
- Prior art keywords
- fibres
- electrode according
- bars
- paste
- electrode
- Prior art date
Links
- 239000011521 glass Substances 0.000 claims description 4
- 239000011810 insulating material Substances 0.000 claims description 3
- 239000000314 lubricant Substances 0.000 claims description 2
- 239000004753 textile Substances 0.000 claims description 2
- 229920002472 Starch Polymers 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch 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
- H01M4/70—Carriers or collectors characterised by shape or form
- H01M4/72—Grids
- H01M4/73—Grids for lead-acid accumulators, e.g. frame plates
-
- 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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Cell Electrode Carriers And Collectors (AREA)
- Cell Separators (AREA)
- Secondary Cells (AREA)
Abstract
Negative electrode supports in the form of a frame with bars have gaps such that the ratio between the total length of the bars in cm divided by the overall area of the plate in cm<2> is less than 1.5, the paste includes fibres 6 to 25 mm long which constitute between 0.25% and 1.5% the weight of the paste.
Description
The present invention relates to negative electrodes for lead accumulators, in particular those in the form of plates comprising a paste support in the form of a frame with bars and at least superficially metallic, together with an electrochemically active paste containing fibres.
In negative electrodes, the active material is spongylead and because of this it conducts current. It therefore follows at the support for the said material,which support is generally in the form of a grid, performs an essentially mechanical role, whereas for the positive electrodes the support must also perform the role of a current collector.
Attempts have been made for a long time to reduce battery weight by using lightened grids,especially for the negative electrodes, e.g. by reducing the number of bars.
However, the applicant has observed that the electrodes thus obtained are not satisfactory since they have inadequate mechanical strength.
After many experiments, the applicant has had the idea of introducing fibres into the active masses of lightened support electrodes in order to compensate for the drop in mechanical strength, the said fibres having well-defined structural features, in particular length, and co-operating closely with the degree of lightening of the support.
The present invention provides a negative electrode for a lead accumulator, the electrode being in the form of a plate comprising a paste support in the form of a frame with bars and at least superficially metallic, and an electrochemically active paste, wherein the ratio between the total length of the said bars, measured in centimetres,and the area of the plate calculated in square centimetres,is less than 1.5, and wherein the said paste includes fibres constituting between 0.25% and 1.5% thereof by weight, the lengths of the said fibres lying between 6 and 25 mm.
Advantageously the said ratio is less than 1, and prefer35 ably it lies between 0.25 and 0.50.
The fibres may be constituted by an insulating material, especially one based on glass.
The invention also provides lead accumulators including electrodes as defined above.
An embodiment of the invention is described with reference to the accompanying drawing in which the sole figure is a partial plan view of a support suitable for use in the present invention and shown by way of example.
The support comprises a rectangular frame 1 provided with three bars 2,3 and 4 converging on the same corner. The sides of the frame are referenced 5,6,7 and 8. Means for conveying current are not shown.
The angle between the side 5 and the bar 2 is about 45°.
The angle between the bars 2 and 3 is about 13°.
The angle between the bars 3 and 4 is about 9°.
The length of the bars 5 and 7 is about 10 cm.
The length of the bars 6 and 8 is about 14.5 cm.
The total length of the bars 2,3 and 4 is less than 40 cm and is about 38 cm, the length of each of the said bars being respectively about 9.5, 16 and 12.3 cm.
In a conventional support, in the form of a rectangular grid of sides equal to the sides 5,6, 7 and 8, the total length of the bars of the grid is about 325 cm.
Xn the case of a support in accordance with the invention and as shown, the ratio between the total length of the bars and the area of the plate as defined by the area of the support is :
x 14.5 while in the case of a conventional grid it is :
x 14.5
i.e. about 8 to 10 times more.
As already mentioned the quantity of fibres in the paste lies between 0.25% and 1.5% of the weight of lead powder. For example, in the support shown, it may lie between 0.5 and 1%.
The lengths of the fibres lie between 6 and 25 mm and preferably between 13 and 18 mm.
The diameter of the fibres may be of the order of 14 microns.
Fibres comprising 98% glass and 2% textile lubricant, e.g. starch, may be used for this purpose.
It is important to limit the lengths of the fibres and their concentration in the paste, since otherwise they may interfere with mixing and spreading of the paste. Further, it is quite clear that fibres which are too short fail to provide the desired mechanical strength.
The nature of the fibres must also be such that they do not break during the mixing up operation.
It is possible to retain a bar section substantially the same as those used for conventional grids when performing the invention, thereby insuring ease of casting using conventional manufacturing techniques.
The weight of the support may be reduced by about 40% or even im to 45% as compared with a conventional grid.
Claims (12)
1/ A negative electrode for a lead accumulator, the electrode being in the form of a plate comprising a paste support in the form of a frame with bars and at least superficially metallic, and an electrochemically active paste, wherein the ratio between the total length of the said bars, measured in centimetres, and the area of the plate calculated in square centimetres, is less than 1.5, and wherein the said paste includes fibres comprising between 0.25% and 1.5% thereof by weight, the lengths of the said fibres lying between 6 and 25 mm.
2. / An electrode according to claim 1, wherein the area of the plate is about 145 cm^, and the total length of the bars is about 40 cm.
3. / An electrode according to any preceding claim, wherein the said ratio is less than 1, and preferably lies between 0.25 and 0.50.
4. / An electrode according to any preceding claim, wherein the fibres constitute between 0.5 and 1% by weight of the paste.
5. / An electrode according to any preceding claim, wherein the lengths of the fibres lie preferably between 13 and 18 mm.
6. / An electrode according to any preceding claim, wherein the diameter of the fibres is about 14 microns.
7. / An electrode according to any preceding claim, wherein the fibres are constituted by an insulating material.
8. / An electrode according to claim 7, wherein the said insulating material is based on glass.
9. / An electrode according to claim 8, wherein the fibres are constituted by about 98% glass and about 2% textile lubricant.
10. / An electrode according to any preceding claim, wherein the support is in the form of a rectangular frame having three bars converging on a single corner.
11. / A negative electrode for a lead accumulator, substantially 5 as herein described with reference to the accompanying drawings.
12. / A lead accumulator including negative electrodes according to any preceding claim.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7821501A FR2431772A1 (en) | 1978-07-20 | 1978-07-20 | IMPROVEMENTS ON NEGATIVE LEAD BATTERY ELECTRODES |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| IE791362L IE791362L (en) | 1980-01-20 |
| IE48530B1 true IE48530B1 (en) | 1985-02-20 |
Family
ID=9210941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IE1362/79A IE48530B1 (en) | 1978-07-20 | 1979-08-08 | Lead accumulators and negative electrodes therefor |
Country Status (9)
| Country | Link |
|---|---|
| BE (1) | BE877395A (en) |
| DE (1) | DE2928422A1 (en) |
| DK (1) | DK305079A (en) |
| FR (1) | FR2431772A1 (en) |
| GB (1) | GB2027555B (en) |
| IE (1) | IE48530B1 (en) |
| IT (1) | IT1119320B (en) |
| LU (1) | LU81516A1 (en) |
| NL (1) | NL7905565A (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB190053A (en) * | 1922-02-07 | 1922-12-14 | Arthur Owen Garrett | Storage battery grid |
| GB479104A (en) * | 1935-04-25 | 1938-01-31 | Owens Illinois Glass Co | Improvements in storage battery plates |
| GB1429189A (en) * | 1972-06-03 | 1976-03-24 | Lucas Batteries Ltd | Battery plate grids for electric storage batteries |
| DE2425375A1 (en) * | 1974-05-25 | 1975-12-04 | Varta Batterie | ELECTRODE GRID FOR LEAD ACCUMULATORS |
| DE2509948A1 (en) * | 1975-03-07 | 1976-09-09 | Varta Batterie | METHOD OF FILLING TUBE ELECTRODES FOR LEAD ACCUMULATORS |
| GB1517267A (en) * | 1977-04-26 | 1978-07-12 | Ni I Electron Tekhnol | Paste for accumulator electrodes |
-
1978
- 1978-07-20 FR FR7821501A patent/FR2431772A1/en active Granted
-
1979
- 1979-07-02 IT IT68390/79A patent/IT1119320B/en active
- 1979-07-02 GB GB7922981A patent/GB2027555B/en not_active Expired
- 1979-07-02 BE BE1/9446A patent/BE877395A/en not_active IP Right Cessation
- 1979-07-13 DE DE19792928422 patent/DE2928422A1/en not_active Withdrawn
- 1979-07-17 NL NL7905565A patent/NL7905565A/en not_active Application Discontinuation
- 1979-07-17 LU LU81516A patent/LU81516A1/en unknown
- 1979-07-19 DK DK305079A patent/DK305079A/en not_active Application Discontinuation
- 1979-08-08 IE IE1362/79A patent/IE48530B1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| FR2431772A1 (en) | 1980-02-15 |
| IE791362L (en) | 1980-01-20 |
| GB2027555A (en) | 1980-02-20 |
| IT7968390A0 (en) | 1979-07-02 |
| DK305079A (en) | 1980-01-21 |
| IT1119320B (en) | 1986-03-10 |
| DE2928422A1 (en) | 1980-01-31 |
| NL7905565A (en) | 1980-01-22 |
| FR2431772B1 (en) | 1983-08-05 |
| GB2027555B (en) | 1982-09-29 |
| LU81516A1 (en) | 1980-02-14 |
| BE877395A (en) | 1980-01-02 |
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