IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
|
| 국제특허분류(IPC7판) |
|
| 출원번호 |
UP-0504700
(2003-02-07)
|
| 등록번호 |
US-7682738
(2010-04-21)
|
| 국제출원번호 |
PCT/US2003/003803
(2003-02-07)
|
| §371/§102 date |
20040806
(20040806)
|
| 국제공개번호 |
WO03/067684
(2003-08-14)
|
|
발명자
/ 주소 |
- Ferreira, Antonio L.
- Zgruis, George C.
- Lifshutz, Norman
|
| 출원인 / 주소 |
|
| 대리인 / 주소 |
Choate, Hall & Stewart LLP
|
| 인용정보 |
피인용 횟수 :
6 인용 특허 :
82 |
초록
▼
A method for producing a lead acid battery that operates on the oxygen cycle is disclosed. The method includes the steps of: assembling a cell comprising a positive plate, a negative plate, and a sheet of separator material which is an absorbent, porous filtration medium, so that there is free space
A method for producing a lead acid battery that operates on the oxygen cycle is disclosed. The method includes the steps of: assembling a cell comprising a positive plate, a negative plate, and a sheet of separator material which is an absorbent, porous filtration medium, so that there is free space between the plates and surfaces of the separator, inserting the cell into a case, introducing into the case a mixture of sulfuric acid and silica including silica from a never dried precipitated silica slurry, causing the sulfuric acid in the mixture in the free space to gel, and sealing the case. The sulfuric acid in the mixture in the free space can be caused to gel by an increase in the silica content thereof, by an increase in the specific gravity thereof, or by both an increase in the silica content thereof, and an increase in the specific gravity thereof.
대표청구항
▼
We claim: 1. A method for producing a lead acid battery that operates on the oxygen cycle, said method comprising the steps of: assembling a cell comprising a pasted, unformed positive plate, a pasted, unformed negative plate, and, between the plates, a sheet of separator material which is an absor
We claim: 1. A method for producing a lead acid battery that operates on the oxygen cycle, said method comprising the steps of: assembling a cell comprising a pasted, unformed positive plate, a pasted, unformed negative plate, and, between the plates, a sheet of separator material which is an absorbent, porous filtration medium wherein there is free space between at least one of the plates and at least one of the surfaces of the separator, inserting the cell into a case, introducing into the case a mixture of sulfuric acid, of a given, first specific gravity, and silica including at least 10 percent by weight of silica from a never dried precipitated silica slurry, the mixture containing silica in a first, given silica concentration, which is below that which would cause sulfuric acid having the given specific gravity to gel, whereby sulfuric acid is absorbed into the plates and the absorbent, porous filtration medium of the separator material while silica is filtered out of that sulfuric acid, thereby increasing the concentration of silica in sulfuric acid which remains in the free space to a second silica concentration which is higher than the first concentration and is below the concentration which would cause the sulfuric acid in the mixture in the free space to gel, sealing the case, and forming the plate to increase the concentration of the sulfuric acid in the cell to one which, at the second concentration of silica, causes gelation of the sulfuric acid in the free space. 2. A method for producing a gelled lead acid battery that operates on the oxygen cycle, said method comprising the steps of: assembling a cell comprising a positive plate which has been formed and dried, at least one negative plate which has been formed and dried, and separator material between the plates, wherein the separator material constitutes an absorbent porous filtration medium and wherein there is free space between at least one of the surfaces of the separator material and at least one of the surfaces of the plates; inserting the cell into a case, introducing into the case a mixture of sulfuric acid of a given, first specific gravity, and silica including at least some silica from a never dried precipitated silica slurry, the mixture containing silica in a first, given concentration, which is below that which would cause sulfuric acid having the given specific gravity to gel, whereby sulfuric acid is absorbed into the plates and the absorbent porous filtration medium of the separator material while silica is filtered out of that sulfuric acid, thereby increasing the concentration of silica in the mixture which remains in the free space to a second concentration which causes the sulfuric acid in the mixture in the free space to gel, and sealing the case. 3. The method claimed in claim 1 wherein the mixture of sulfuric acid and silica comprises sulfuric acid having a specific gravity between about 1.200 and 1.250 and, wherein the silica particles are present in a concentration between about 2 and 15 weight product. 4. The electrolyte method claimed in claim 3 wherein some of the silica particles are from fumed silica and such silica particles are present in a concentration between about 0.5 to 5.0 weight percent. 5. The method claimed in claim 1 or 2 wherein the separator comprises entangled fibers, wherein the separator is operable to absorb at least three times its weight of sulfuric acid electrolyte, wherein the separator has a pore structure such that it is operable to filter silica particles as small as 3 microns from a mixture of sulfuric acid and silica particles and wherein the separator is operable, when positioned between plates in a cell in a case, to define free space between at least one of its surfaces and at least one of the surfaces of the plates. 6. The method claimed in claim 1 or 2 wherein the separator comprises a sheet comprising entangled fibers, wherein the sheet has opposed major surfaces and is operable to absorb at least three times its weight of sulfuric acid and has a pore structure such that it is operable to filter silica particles as small as 3 microns from a mixture of sulfuric acid and silica particles, and wherein the sheet is contoured so that, when it is positioned between facing major surfaces of adjacent plates of a battery, with its major surfaces facing the major surfaces of the plates, there is at least one space between a major surface of the separator and the adjacent major surface of the separator. 7. A method as claimed in claim 1 wherein the positive electrode is a tubular electrode. 8. A battery produced by the method of claim 1. 9. A method as claimed in claim 1 wherein the silica includes at least 50 percent by weight of silica from a never dried precipitated silica slurry. 10. The method claimed in claim 1 wherein gelling of the sulfuric acid in the free space takes place towards the end of plate formation. 11. The method claimed in claim 2 for producing a lead acid battery wherein the mixture of sulfuric acid and silica that is introduced thereinto prior the sealing of the case and forming of the plate comprises sulfuric acid having a specific gravity between about 1.250 and 1.280 and silica particles, at least 10% by weight of which are from a never dried precipitated silica slurry, and wherein the silica particles are present in a concentration between about 2 and 15 weight percent. 12. The method claimed in claim 11 wherein some of the silica particles in the mixture of sulfuric acid and silica particles are from fumed silica and such silica particles are present in a concentration between about 0.5 to 5.0 weight percent. 13. A method as claimed in claim 2 wherein the positive electrode is a tubular electrode. 14. A battery produced by the method of claim 2. 15. A method as claimed in claim 2 wherein the silica includes at least 50 percent by weight of silica from a never dried precipitated silica slurry. 16. A method for producing a lead acid battery that operates on the oxygen cycle, said method comprising the steps of: assembling a cell comprising a pasted, unformed positive plate, a pasted, unformed negative plate, and, between the plates, a sheet of separator material which is an absorbent, porous filtration medium, inserting the cell into a case so that there is free space between the case and the adjacent edges of the plates and of the separator material, introducing into the case a mixture of sulfuric acid and silica including at least about 0.5 percent by weight of silica from a never dried precipitated silica slurry, the mixture containing silica in a first, given concentration, which is below that which would cause sulfuric acid having the given specific gravity to gel, whereby sulfuric acid is absorbed into the plates and the absorbent, porous filtration medium of the separator material while silica is filtered out of that sulfuric acid, thereby increasing the concentration of silica in sulfuric acid which remains in the free space to a second concentration which is higher than the first concentration and is below the concentration which would cause the sulfuric acid in the mixture in the free space to gel, and increasing the specific gravity of the sulfuric acid in the cell, by forming the plates, to a concentration which, in combination with the second concentration of silica, causes gelation of the sulfuric acid in the free space. 17. A method as claimed in claim 16 wherein the positive electrode is a tubular electrode. 18. A battery produced by the method of claim 16. 19. A method as claimed in claim 16 wherein the silica includes at least 50 percent by weight of silica from a never dried precipitated silica slurry. 20. A method for producing a lead acid battery that operates on the oxygen cycle, said method comprising the steps of: assembling a cell comprising a formed and dried positive plate, a formed and dried negative plate, and, between the plates, a sheet of separator material which is an absorbent, porous filtration medium, inserting the cell into a case so that there is free space between the case and the adjacent edges of the plates and of the separator material, introducing into the case a mixture of sulfuric acid and silica including at least about 0.5 percent by weight of silica from a never dried precipitated silica slurry, the mixture containing silica in a first, given concentration, which is below that which would cause sulfuric acid having the given specific gravity to gel, whereby sulfuric acid is absorbed into the plates and the absorbent, porous filtration medium of the separator material while silica is filtered out of that sulfuric acid, thereby increasing the concentration of silica in sulfuric acid which remains in the free space to a second concentration which is higher than the first concentration and is sufficiently high to cause the sulfuric acid in the mixture in the free space to gel. 21. A method as claimed in claim 20 wherein the positive electrode is a tubular electrode. 22. A battery produced by the method of claim 20. 23. A method as claimed in claim 20 wherein the silica includes at least 50 percent by weight of silica from a never dried precipitated silica slurry.
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