CA2074159C - Method of manufacturing a sealed type nickel-hydrogen cell - Google Patents
Method of manufacturing a sealed type nickel-hydrogen cellInfo
- Publication number
- CA2074159C CA2074159C CA002074159A CA2074159A CA2074159C CA 2074159 C CA2074159 C CA 2074159C CA 002074159 A CA002074159 A CA 002074159A CA 2074159 A CA2074159 A CA 2074159A CA 2074159 C CA2074159 C CA 2074159C
- Authority
- CA
- Canada
- Prior art keywords
- cell
- sealed type
- type nickel
- hydrogen
- manufacturing
- 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.)
- Expired - Fee Related
Links
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 25
- 239000001257 hydrogen Substances 0.000 title claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 21
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 16
- 239000000956 alloy Substances 0.000 description 12
- 229910045601 alloy Inorganic materials 0.000 description 12
- 229910052759 nickel Inorganic materials 0.000 description 8
- 239000003792 electrolyte Substances 0.000 description 7
- 239000002245 particle Substances 0.000 description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000003487 electrochemical reaction Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910017865 LaNi4 Inorganic materials 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000005245 sintering 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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/34—Gastight accumulators
- H01M10/345—Gastight metal hydride accumulators
-
- 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
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49108—Electric battery cell making
- Y10T29/4911—Electric battery cell making including sealing
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
The invention reduces the number of cycles of charge-discharge operation required in the formation process involved in manufacturing of a sealed type nickel-hydrogen cell having a large high-rate discharge capacity. In the formation process, a sealed type nickel-hydrogen cell is subjected to at least one cycle of charge-discharge operation and thereafter kept at a temperature in the range of about 30°C to 60°C for a predetermined length of time.
Description
This invention relates to a method of manufacturing a sealed type nickel-hydrogen cell.
A method applicable to manufacturing a sealed type nickel-hydrogen cell employing a hydrogen-occlusion alloy electrode has much in common with that used to manufacture a nickel-cadmium cell, so that it is possible to divert the existing manufacturing facilities of the latter to manufacturing of the former and such diversion is viewed to be more advantageous in terms of equipment investment.
In one example of the sealed type nickel-hydrogen cell manufacturing method, well-known pasted type nickel electrode plate and pasted type hydrogen electrode plate are stacked in a laminate fashion with a separator placed therebetween, and rolled up together to be inserted into a cylindrical can; as an electrolyte, an aqueous solution of 7N KOH is then put into the can and a lid is then attached thereto by caulking for airtight sealing of the can; and this sealed type - cylindrical nickel-hydrogen cell so fabricated is subjected to a formation process in which it is charged and discharged for the formation treatment of both the nickel and the hydrogen electrode plates. In another example of said sealed type nickel-hydrogen cell, the pasted type nickel electrode and hydrogen electrode plates are stacked also in a laminate fashion with a separator placed therebetween and inserted flat in a square can; as an electrolyte, an aqueous solution of 7N KOH is put into the can and pasted a lid is then attached thereto by means of laser welding to hermetically seal the can; and this square sealed type nickel-hydrogen cell so fabricated is put in a formation process wherein it is charged and discharged for the formation treatment of both the nickel and the hydrogen electrode plates.
Either type of the above mentioned sealed type nickel-hydrogen cells comes to show its rated capacity at a low discharge rate such as 0.2C when treated with one to three cycles of charge-discharge operation in the above mentioned formation process. However, the discharge capacity it can provide at a lC or higher discharge rate is much smaller, so that the cell has to be charged and discharged repeatedly for ten cycles or more in the formation process in order to increase said capacity, this charge-discharge operation repeated for so many times making the formation process considerably more troublesome and time-consuming and resulting in higher production cost and other inconveniences.
The present invention relates to an improved method of manufacturing a sealed type nickel-hydrogen cell through use of the formation process of a sealed type nickel-hydrogen cell, the cell is kept or retained at a temperature in the range of about 30~C to 60~C for a predetermined length of time after being subjected to at least one cycle of the - charge-discharge operation.
Fig. 1 is a graph showing relationships between the treatment temperatures and time lengths in the formation process and the discharge capacities obtained from the respective cells.
The principle of the present invention is yet to be clarified. It may be that although there occurs with one or more cycles of the charge-discharge operation applied to the cell a kind of pulverization whereby many fine cracks are formed in hydrogen-occlusion alloy particles contained in the hydrogen-occlusion electrode to result in a remarkable increase of the surface area of the alloy particles, the electrolyte nevertheless can not infiltrate sufficiently into all the alloy particles due to its comparatively high viscosity and as a result the surface area actually contributing to the electrochemical reaction remains small.
It is further assumed that when the cell in the above condition is kept at the above-mentioned high temperature for a predetermined length of time, the viscosity of the electrolyte becomes lower and the electrolyte infiltrates more thoroughly into the alloy particles to increase the effective surface area contributing to the electrochemical reaction and as a result there is obtained much increased discharge capacity at a lC or higher rate. In this case, the greatest high-rate discharge capacity is obtained when the cell is kept at a temperature in the range of 30~C to 60~C
for 48 hours to 6 hours at least.
In the following, examples of the present invention will be described with reference to the accompanying single drawing. Commercially available La, Ni, and Al were weighed - and mixed to a predetermined composition ratio, and then heat-melted by means of an arc melting method. As an example, they were so mixed as to produce an alloy having composition of LaNi4.sAlO.s- said alloy being used as the hydrogen-occlusion alloy for the negative electrode. This alloy was pulverized into fine alloy powder of 250-mesh size or smaller. Added to this pulverized material were fluorocarbon resin powder at 5 wt.% and, as an electroconductive agent, carbonyl nickel powder at 20 wt.%.
After mixing them, an aqueous solution of a viscosity d I n.~ C4 ~ th~/ ~e//~/z~e 'lnt~n~ifl~r agent such asCCMC)~as added to the mixture to make a slurry thereof. This slurry was applied to a perforated sheet and dried thereon.
After that, it was pressed to a predetermined thickness and heat-treated for sintering of the resin particles, thereby manufacturing a pasted type hydrogen-occlusion electrode.
This alloy electrode was used as the negative electrode and a well-known pasted type nickel electrode as the positive electrode. They were stacked in a laminate fashion together with a nylon separator placed therebetween, rolled up together and put into a cylindrical can. As an electrolyte, an aqueous solution of 7N KOH was put into the can and a lid was attached thereto by caulking for airtight sealing of the can, thereby fabricating a cylindrical sealed type nickel electrode-controlled lOOmAh nickel-hydrogen cell.
This sealed type nickel-hydrogen cell fabricated in the above manner was subjected to at least one cycle of~charge-discharge operation and thereafter kept~at a~ té~perature inthe range of about 30~C to 60~C for a desired length of time in accordance with the formation process of this invention, - and finally fully charged to complete the formation thereof.
As a result, it has been confirmed that it is possible to obtain with one cycle of the charge-discharge operation a sealed type nickel-hydrogen cell formed to have the rated high discharge capacity at a lC or higher discharge rate and capable of providing the high capacity as from the initial rapid discharge while doing away with the time-consuming and troublesome repetition of the charge-discharge operation for 10 times or more as required in the conventional formation process.
In order to find out the effect of the above-described treatment in the formation process according to the present invention, a plurality of the cylindrical sealed type nickel-hydrogen cells fabricated in the above mentioned manner were prepared for comparative testing to compare examples of the present invention with other comparative examples. More specifically, said plurality of the cells were first subjected to one cycle of charge-discharge operation in which they were charged with O.lC current at 20~C up to 150% of the rated capacity and then discharged at the same current rate to the cell voltage of l.OV. They were divided into different groups, put in thermostatic apparatus and kept therein at different temperatures for different lengths of time, respectively. After this treatment, they were invariably charged with 0.2C current at 20~C up to 150%
of the rated capacity to complete the formation of both the nickel and the hydrogen electrodes.
These test cells treated under the above mentioned different conditions for the formation as described in the foregoing were measured for their respective discharge capacities by discharging them with 3C current at 0~C to the cell voltage of l.OV. The results so obtained are as shown in Fig. 1. In the drawing, A, B, C, D and E refer to the characteristic curves for the discharge capacities of the cells obtained when the cells were kept consistently at 60~C, 40~C, 30~C, 25~C or 20~C respectively and measured at the time intervals of 10, 20, 30 40, 50 and 60 hours while under this formation treatment.
As is clear from the foregoing, the cell becomes capable of providing the largest discharge capacity when it has been kept at 30~C for 48 hours, at 40~C for 24 hours and at 60~C
for 6 hours, respectively. This largest discharge capacity corresponds to that obtained with ten or more cycles of the charge-discharge operation applied in the conventional 2t~ 9 formation process. This indicates that, according to the present invention, there can be obtained a cell or battery so formed with one cycle of the charge-discharge operation as to be capable of providing a large high-rate discharge capacity if kept thereafter at a high temperature in the range of 30~C
to 60~C in the formation process, said cell or battery suited for a rapid discharge use.
There have been observed some improvements in terms of the high-rate discharge capacity even when the cell was kept at lower temperatures such as 20~C and 25~C for the formation treatment, but none of them was effective enough to bring about the required high discharge capacity.
When the cell was kept at a temperature much higher than 60~C in said formation process, the result was unfavorable, including a thermal deterioration of the electrode plates and the separator. On the other hand, keeping the cell at a temperature lower than 30~C and close to 25~C for the formation treatment produced no effect.
The cell kept at a temperature ranging from about 30~C
to 60~C prior to initiation of the formation process produced no effect either. In this case, there was seen even an adverse effect.
Although the above described examples relate to the instance where only one cycle of the charge-discharge operation was applied for the formation treatment, said charge-discharge operation may be repeated for two or more times and such is considered even recommendable if such brings about more cracks in the alloy particles and ;~Q~ 9 consequently more infiltration thereinto of the electrolyte.
Needless to say, there is no use applying such repetitive charge-discharge operation unless it brings about a high discharge capacity greater than the largest obtainable with one cycle of said operation.
According to the present invention as described in the foregoing, a sealed type nickel-hydrogen cell formed through the formation process wherein the cell is subjected to at least one cycle of the charge-discharge operation and B lo thereafter kept~at a ~émper~a~ure in the range of about 30~C
to 60~C for a predetermined length of time for the formation treatment provides a high discharge capacity even at a lC or higher discharge rate, thus assuring the high discharge capacity as from the initial rapid discharge operation, while eliminating such troublesome operation and disadvantage as ten or more cycles of the continuous charge-discharge operation required in the conventional formation process to obtain a cell or battery having a higher high-rate discharge capacity, and the resultant greater power consumption that pushes up the production cost.
A method applicable to manufacturing a sealed type nickel-hydrogen cell employing a hydrogen-occlusion alloy electrode has much in common with that used to manufacture a nickel-cadmium cell, so that it is possible to divert the existing manufacturing facilities of the latter to manufacturing of the former and such diversion is viewed to be more advantageous in terms of equipment investment.
In one example of the sealed type nickel-hydrogen cell manufacturing method, well-known pasted type nickel electrode plate and pasted type hydrogen electrode plate are stacked in a laminate fashion with a separator placed therebetween, and rolled up together to be inserted into a cylindrical can; as an electrolyte, an aqueous solution of 7N KOH is then put into the can and a lid is then attached thereto by caulking for airtight sealing of the can; and this sealed type - cylindrical nickel-hydrogen cell so fabricated is subjected to a formation process in which it is charged and discharged for the formation treatment of both the nickel and the hydrogen electrode plates. In another example of said sealed type nickel-hydrogen cell, the pasted type nickel electrode and hydrogen electrode plates are stacked also in a laminate fashion with a separator placed therebetween and inserted flat in a square can; as an electrolyte, an aqueous solution of 7N KOH is put into the can and pasted a lid is then attached thereto by means of laser welding to hermetically seal the can; and this square sealed type nickel-hydrogen cell so fabricated is put in a formation process wherein it is charged and discharged for the formation treatment of both the nickel and the hydrogen electrode plates.
Either type of the above mentioned sealed type nickel-hydrogen cells comes to show its rated capacity at a low discharge rate such as 0.2C when treated with one to three cycles of charge-discharge operation in the above mentioned formation process. However, the discharge capacity it can provide at a lC or higher discharge rate is much smaller, so that the cell has to be charged and discharged repeatedly for ten cycles or more in the formation process in order to increase said capacity, this charge-discharge operation repeated for so many times making the formation process considerably more troublesome and time-consuming and resulting in higher production cost and other inconveniences.
The present invention relates to an improved method of manufacturing a sealed type nickel-hydrogen cell through use of the formation process of a sealed type nickel-hydrogen cell, the cell is kept or retained at a temperature in the range of about 30~C to 60~C for a predetermined length of time after being subjected to at least one cycle of the - charge-discharge operation.
Fig. 1 is a graph showing relationships between the treatment temperatures and time lengths in the formation process and the discharge capacities obtained from the respective cells.
The principle of the present invention is yet to be clarified. It may be that although there occurs with one or more cycles of the charge-discharge operation applied to the cell a kind of pulverization whereby many fine cracks are formed in hydrogen-occlusion alloy particles contained in the hydrogen-occlusion electrode to result in a remarkable increase of the surface area of the alloy particles, the electrolyte nevertheless can not infiltrate sufficiently into all the alloy particles due to its comparatively high viscosity and as a result the surface area actually contributing to the electrochemical reaction remains small.
It is further assumed that when the cell in the above condition is kept at the above-mentioned high temperature for a predetermined length of time, the viscosity of the electrolyte becomes lower and the electrolyte infiltrates more thoroughly into the alloy particles to increase the effective surface area contributing to the electrochemical reaction and as a result there is obtained much increased discharge capacity at a lC or higher rate. In this case, the greatest high-rate discharge capacity is obtained when the cell is kept at a temperature in the range of 30~C to 60~C
for 48 hours to 6 hours at least.
In the following, examples of the present invention will be described with reference to the accompanying single drawing. Commercially available La, Ni, and Al were weighed - and mixed to a predetermined composition ratio, and then heat-melted by means of an arc melting method. As an example, they were so mixed as to produce an alloy having composition of LaNi4.sAlO.s- said alloy being used as the hydrogen-occlusion alloy for the negative electrode. This alloy was pulverized into fine alloy powder of 250-mesh size or smaller. Added to this pulverized material were fluorocarbon resin powder at 5 wt.% and, as an electroconductive agent, carbonyl nickel powder at 20 wt.%.
After mixing them, an aqueous solution of a viscosity d I n.~ C4 ~ th~/ ~e//~/z~e 'lnt~n~ifl~r agent such asCCMC)~as added to the mixture to make a slurry thereof. This slurry was applied to a perforated sheet and dried thereon.
After that, it was pressed to a predetermined thickness and heat-treated for sintering of the resin particles, thereby manufacturing a pasted type hydrogen-occlusion electrode.
This alloy electrode was used as the negative electrode and a well-known pasted type nickel electrode as the positive electrode. They were stacked in a laminate fashion together with a nylon separator placed therebetween, rolled up together and put into a cylindrical can. As an electrolyte, an aqueous solution of 7N KOH was put into the can and a lid was attached thereto by caulking for airtight sealing of the can, thereby fabricating a cylindrical sealed type nickel electrode-controlled lOOmAh nickel-hydrogen cell.
This sealed type nickel-hydrogen cell fabricated in the above manner was subjected to at least one cycle of~charge-discharge operation and thereafter kept~at a~ té~perature inthe range of about 30~C to 60~C for a desired length of time in accordance with the formation process of this invention, - and finally fully charged to complete the formation thereof.
As a result, it has been confirmed that it is possible to obtain with one cycle of the charge-discharge operation a sealed type nickel-hydrogen cell formed to have the rated high discharge capacity at a lC or higher discharge rate and capable of providing the high capacity as from the initial rapid discharge while doing away with the time-consuming and troublesome repetition of the charge-discharge operation for 10 times or more as required in the conventional formation process.
In order to find out the effect of the above-described treatment in the formation process according to the present invention, a plurality of the cylindrical sealed type nickel-hydrogen cells fabricated in the above mentioned manner were prepared for comparative testing to compare examples of the present invention with other comparative examples. More specifically, said plurality of the cells were first subjected to one cycle of charge-discharge operation in which they were charged with O.lC current at 20~C up to 150% of the rated capacity and then discharged at the same current rate to the cell voltage of l.OV. They were divided into different groups, put in thermostatic apparatus and kept therein at different temperatures for different lengths of time, respectively. After this treatment, they were invariably charged with 0.2C current at 20~C up to 150%
of the rated capacity to complete the formation of both the nickel and the hydrogen electrodes.
These test cells treated under the above mentioned different conditions for the formation as described in the foregoing were measured for their respective discharge capacities by discharging them with 3C current at 0~C to the cell voltage of l.OV. The results so obtained are as shown in Fig. 1. In the drawing, A, B, C, D and E refer to the characteristic curves for the discharge capacities of the cells obtained when the cells were kept consistently at 60~C, 40~C, 30~C, 25~C or 20~C respectively and measured at the time intervals of 10, 20, 30 40, 50 and 60 hours while under this formation treatment.
As is clear from the foregoing, the cell becomes capable of providing the largest discharge capacity when it has been kept at 30~C for 48 hours, at 40~C for 24 hours and at 60~C
for 6 hours, respectively. This largest discharge capacity corresponds to that obtained with ten or more cycles of the charge-discharge operation applied in the conventional 2t~ 9 formation process. This indicates that, according to the present invention, there can be obtained a cell or battery so formed with one cycle of the charge-discharge operation as to be capable of providing a large high-rate discharge capacity if kept thereafter at a high temperature in the range of 30~C
to 60~C in the formation process, said cell or battery suited for a rapid discharge use.
There have been observed some improvements in terms of the high-rate discharge capacity even when the cell was kept at lower temperatures such as 20~C and 25~C for the formation treatment, but none of them was effective enough to bring about the required high discharge capacity.
When the cell was kept at a temperature much higher than 60~C in said formation process, the result was unfavorable, including a thermal deterioration of the electrode plates and the separator. On the other hand, keeping the cell at a temperature lower than 30~C and close to 25~C for the formation treatment produced no effect.
The cell kept at a temperature ranging from about 30~C
to 60~C prior to initiation of the formation process produced no effect either. In this case, there was seen even an adverse effect.
Although the above described examples relate to the instance where only one cycle of the charge-discharge operation was applied for the formation treatment, said charge-discharge operation may be repeated for two or more times and such is considered even recommendable if such brings about more cracks in the alloy particles and ;~Q~ 9 consequently more infiltration thereinto of the electrolyte.
Needless to say, there is no use applying such repetitive charge-discharge operation unless it brings about a high discharge capacity greater than the largest obtainable with one cycle of said operation.
According to the present invention as described in the foregoing, a sealed type nickel-hydrogen cell formed through the formation process wherein the cell is subjected to at least one cycle of the charge-discharge operation and B lo thereafter kept~at a ~émper~a~ure in the range of about 30~C
to 60~C for a predetermined length of time for the formation treatment provides a high discharge capacity even at a lC or higher discharge rate, thus assuring the high discharge capacity as from the initial rapid discharge operation, while eliminating such troublesome operation and disadvantage as ten or more cycles of the continuous charge-discharge operation required in the conventional formation process to obtain a cell or battery having a higher high-rate discharge capacity, and the resultant greater power consumption that pushes up the production cost.
Claims (3)
1. A method of manufacturing a sealed type nickel-hydrogen cell comprising: during the formation process maintaining said cell in its discharged state at a temperature in the range of 30°C
to 60°C for a predetermined length of time after treatment with at least one cycle of charge-discharge operation.
to 60°C for a predetermined length of time after treatment with at least one cycle of charge-discharge operation.
2. A method of manufacturing a sealed type nickel-hydrogen cell as claimed in claim 1, wherein said cell is treated with more than one cycle of the charge-discharge operation and thereafter kept in its discharged state at a temperature in the range of 30°C to 60°C for up to 48 hours.
3. A method of manufacturing a sealed type nickel-hydrogen cell as claimed in claim 2, wherein said cell is kept in its discharged state at said temperature for at least 6 hours.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002074159A CA2074159C (en) | 1992-07-17 | 1992-07-17 | Method of manufacturing a sealed type nickel-hydrogen cell |
| DE69218197T DE69218197T2 (en) | 1992-07-17 | 1992-08-17 | Process for the production of gas-tight nickel hydrogen cells |
| EP92113986A EP0586718B1 (en) | 1992-07-17 | 1992-08-17 | Method of manufacturing sealed type nickel-hydrogen cell |
| US08/138,382 US5334226A (en) | 1992-07-17 | 1993-10-20 | Method of manufacturing a sealed-type nickel-hydrogen cell |
| HK98104182A HK1005052A1 (en) | 1992-07-17 | 1998-05-14 | Method of manufacturing sealed type nickel-hydrogen cell |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002074159A CA2074159C (en) | 1992-07-17 | 1992-07-17 | Method of manufacturing a sealed type nickel-hydrogen cell |
| EP92113986A EP0586718B1 (en) | 1992-07-17 | 1992-08-17 | Method of manufacturing sealed type nickel-hydrogen cell |
| US08/138,382 US5334226A (en) | 1992-07-17 | 1993-10-20 | Method of manufacturing a sealed-type nickel-hydrogen cell |
| HK98104182A HK1005052A1 (en) | 1992-07-17 | 1998-05-14 | Method of manufacturing sealed type nickel-hydrogen cell |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2074159A1 CA2074159A1 (en) | 1994-01-18 |
| CA2074159C true CA2074159C (en) | 1997-11-11 |
Family
ID=27426932
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002074159A Expired - Fee Related CA2074159C (en) | 1992-07-17 | 1992-07-17 | Method of manufacturing a sealed type nickel-hydrogen cell |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5334226A (en) |
| EP (1) | EP0586718B1 (en) |
| CA (1) | CA2074159C (en) |
| DE (1) | DE69218197T2 (en) |
| HK (1) | HK1005052A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0696825B1 (en) | 1994-08-09 | 2004-02-04 | Japan Storage Battery Company Limited | Method for manufacturing nickel-metal-hydride battery |
| US5574353A (en) * | 1995-03-31 | 1996-11-12 | Motorola, Inc. | Electrochemical charge storage device having constant voltage discharge |
| US5512160A (en) * | 1995-08-10 | 1996-04-30 | Hughes Aircraft Company | Nickel-cadmium battery activation process |
| US6287724B2 (en) * | 1997-11-03 | 2001-09-11 | Eveready Battery Company, Inc. | Nickel metal hydride cells designed for high rate/low temperature performance |
| US8056989B2 (en) * | 2007-09-10 | 2011-11-15 | Zielinski Randall S | Child-proof safety latch |
| CN109818087B (en) * | 2019-01-31 | 2022-04-22 | 浙江霖润新能源科技有限公司 | Formation method of nickel-metal hydride battery |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4680241A (en) * | 1983-11-29 | 1987-07-14 | American Telephone And Telegraph Company, At&T Bell Laboratories | Method for restoring the lost capacity of nickel batteries and batteries formed thereby |
| US4926106A (en) * | 1986-07-22 | 1990-05-15 | Tanis Peter G | Aircraft battery charging device |
| DE3725629A1 (en) * | 1987-08-03 | 1989-02-16 | Varta Batterie | GALVANIC ELEMENT |
| JP2512076B2 (en) * | 1988-04-19 | 1996-07-03 | 松下電器産業株式会社 | Manufacturing method of sealed nickel-metal hydride storage battery |
| JPH0644490B2 (en) * | 1989-05-16 | 1994-06-08 | 三洋電機株式会社 | Metal-hydrogen alkaline storage battery manufacturing method |
| JP2548431B2 (en) * | 1990-07-02 | 1996-10-30 | 松下電器産業株式会社 | Nickel-metal hydride battery conversion method |
-
1992
- 1992-07-17 CA CA002074159A patent/CA2074159C/en not_active Expired - Fee Related
- 1992-08-17 DE DE69218197T patent/DE69218197T2/en not_active Expired - Fee Related
- 1992-08-17 EP EP92113986A patent/EP0586718B1/en not_active Expired - Lifetime
-
1993
- 1993-10-20 US US08/138,382 patent/US5334226A/en not_active Expired - Fee Related
-
1998
- 1998-05-14 HK HK98104182A patent/HK1005052A1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| EP0586718B1 (en) | 1997-03-12 |
| DE69218197D1 (en) | 1997-04-17 |
| HK1005052A1 (en) | 1998-12-18 |
| EP0586718A1 (en) | 1994-03-16 |
| CA2074159A1 (en) | 1994-01-18 |
| US5334226A (en) | 1994-08-02 |
| DE69218197T2 (en) | 1997-10-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |