US2404824A - Electrolytic condenser and electrode therefor - Google Patents
Electrolytic condenser and electrode therefor Download PDFInfo
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- US2404824A US2404824A US430173A US43017342A US2404824A US 2404824 A US2404824 A US 2404824A US 430173 A US430173 A US 430173A US 43017342 A US43017342 A US 43017342A US 2404824 A US2404824 A US 2404824A
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- 239000004744 fabric Substances 0.000 description 14
- 238000005096 rolling process Methods 0.000 description 11
- 239000003792 electrolyte Substances 0.000 description 9
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 7
- 239000002923 metal particle Substances 0.000 description 6
- 239000007921 spray Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 125000006850 spacer group Chemical group 0.000 description 5
- 229910021538 borax Inorganic materials 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000004328 sodium tetraborate Substances 0.000 description 4
- 235000010339 sodium tetraborate Nutrition 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 229920000742 Cotton Polymers 0.000 description 2
- 230000001427 coherent effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 101000968267 Drosophila melanogaster Protein dachsous Proteins 0.000 description 1
- 229910000760 Hardened steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001464 adherent effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- TWXDDNPPQUTEOV-FVGYRXGTSA-N methamphetamine hydrochloride Chemical compound Cl.CN[C@@H](C)CC1=CC=CC=C1 TWXDDNPPQUTEOV-FVGYRXGTSA-N 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/04—Electrodes or formation of dielectric layers thereon
- H01G9/048—Electrodes or formation of dielectric layers thereon characterised by their structure
Definitions
- PatentedrJuly 3o, 1946 UNITED ⁇ STATES PATENT OFF l CE ELECTROLYTIC CONDENSER AND ELECTRODE THEREFOR James Marvin Booe, Indianapolis, Ind., asslgnor to F. R. Mallory & 00., Inc., Indianapolis, Ind., a corporation of Delaware Application February 10, 1942, Serial No. 430,113
- An object of the invention is to improve electrolytic condensers and the electrodes therefor, and particularly to improve dry electrolytic condensers.
- the invention comprises the features of construction, combination of elements, arrangement of parts, and methods of manufacture and operation referred to above or which will be brought out and exemplified in the disclosure hereinafter set forth, including the illustration in the drawing.
- Fir-ire 1 shows the initial step in the meth of preparing a condenser electrode
- Figure 2 illustrates a subsequent step which comprises rolling the electrode between pressure v rolls
- FIG. 3 illustrates a completed electrode
- Figure 4 is a section through a portion of a modified form of electrode
- Figure 5 is a sectional view of a completed condenser.
- This invention relates particularly to electrolytic condensers having at least one of their electrodes formed of a finely divided film-forming metal, such as aluminum, deposited in cohering finely divided form upon a porous flexible sheet base such as cloth or gauze.
- the film-forming metal is preferably deposited by a metal spray process using a metal spray gun wherein metal particles are sprayed and simultaneously heated or melted.
- the electrode element comprising a porous or fibrous base carrying a coherent adhering layer of finely divided film-forming metal particles, is subjected to pressure to reduce its thickness and compress the porous electrode metal layer. This is preferably accomplished by rolling the electrode between cooperating calendering rolls of hardened steel or the like.
- the preferred material is a relatively loose woven open-mesh cotton cloth of high purity. Muslin, cheesecloth, cotton gauze and the like are especially suitable in the various weights and thread spacings obtainable commercially.
- the cloth should preferably'be bleached and unsized and free of impurities such as chlorides.
- the spraying time and density are preferably regulated was to produce a sheet which is porous and flexible enough to roll without cracking but in which the sprayed metal particles are bonded together sufliciently to conduct electricity throughout the sheet, thereby forming a porous coherent and adherent layer of metal particles.
- the electrode sheet or strip formed in this manner is compressed, as by rolling, as illustrated'in Figure 2. It will usually be found desirable to chemically clean the sheet electrode, however, before rolling. This may preferably be done by boiling the sprayed electrode for a short time, such as two minutes, in a dilute borax solution, such as a 0.1% borax solution. It is found that this cleaning before rolling results in an increase in capacity of the finished condenser. Or the borax cleaning will permit a greater reduction in thickness without increasing the power factor or reducing the capacity of the condenser produced from the electrode. It also reduces the power and chemicals required for electrolytic film-formation, shortens the aging time of the condns ers and results in a better shelf life and a longer operating life for the condensers.
- the cloth layer 10 carrying spray deposited aluminum particles I2 is rolled and thereby reduced in thickness by passing it between a pair of cooperating steel rollers l4, l5 as shown in Figure 2, thereby resulting in a rolled electrode l8 which is thinner than the original sprayed cloth layer.
- the rolls may be spaced so as to reduce the thickness of the electrode as much as 36%. Thus if the original thickness is .0165 inch on the average, the final thickness may be .0105 inch representing a reduction of 36.4%.
- the electrode After rolling, the electrode is film-formed in a well-known manner. If the electrode has been cleaned before rolling. as described, it is beneficial to dry the electrode after rolling and before film-formation. Whether the electrode is rolled wet or dry is not material but it is undesirable to allow it to remain wet for any extensive period after it has been cleaned in the borax cleaning operation.
- Figure 3 shows a completed condenser electrode comprising the rolled electrode layer I8 and a terminal I! secured thereto by punching the two parts together as indicated at l8.
- the invention is also applicable to condenser electrodes formed of two cloth layers l9 and 20 cemented together by the film-forming metal spray deposit 2! as illustrated in Figure 4.
- FIG. 1 shows a completed condenser comprising a condenser section 22 produced by winding together alternate electrode layers l6 and spacer layers of porous paper, cloth, regenerated sheet cellulose or the like.
- the condenser sectlon 22 is impregnated with a suitable film-maintaining electrolyte and inclosed in a container 23 having a laminated top 24.
- Terminal i1 passes through the laminated top and is connected to a soldering lug 25 mounted in the top.
- the opposite condenser electrode is connected to container 23 by a terminal strip 26 which is spun under the edge of the top.
- the power factor and resistance of the condenser is not materially altered.
- Rolling also insures better electrical conductivity throughout the electrode layer and increases the reliability of electrodes made from a single cloth layer sprayed with a relatively light coating of aluminum. While the rollin hardens the electrode layer slightly, it does not interfere With the winding of the electrode into a roll in producing a condenser.
- An electrolytic condenser comprising cooperating electrodes and an electrolyte in contact therewith, at least one Of said electrodes comprising a compressed layer of finely divided cohering particles of film-forming metal.
- An electrolytic condenser comprising cooperating electrodes and an electrolyte in contact therewith, at least one of said electrodes comprising a compressed layer of finely divided cohering particles of aluminum metal.
- a dry electrolytic condenser comprising cooperating sheet electrodes wound together with porous sheet spacers impregnated with a filmmaintainin electrolyte, at least one of said electrodes comprising a fibrous sheet base carrying a compressed'adherin layer of cohering film-forming metal particles, said layer having a dielectric film thereon.
- a dry electrolytic condenser comprising cooperating sheet electrodes wound together with porous sheet spacers impregnated with a filmmaintaining electrolyte, at least one of said electrodes comprising a cloth base carryin a compressed adhering layer of cohering film-forming metal particles, said layer having a dielectric film thereon.
- An electrode for electrolytic condensers comprising a cloth base carrying an adhering layer of film-forming metal, said layer comprising a compressed cohering spray deposit of aluminum.
- a dry electrolytic condenser comprising cooperatin sheet electrodes wound together with porous sheet spacers impregnated with a filmmaintaining electrolyte, at least one of said electrodes compris ng a cloth base carrying a chemically-cleaned and compressed adhering iayer of cohering aluminum particles, said layer having a continuous dielectric film thereon.
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Description
July 30, 1946. M, BQQE 2,404,824
ELECTROLYTIC CONDENSER AND ELECTRODE THEREFOR Filed Feb. 10, 1942 HAVAVAWAVAswmmrmvmymsws umm'a "lll INVENTOR. hams/1.5006
PatentedrJuly 3o, 1946 UNITED} STATES PATENT OFF l CE ELECTROLYTIC CONDENSER AND ELECTRODE THEREFOR James Marvin Booe, Indianapolis, Ind., asslgnor to F. R. Mallory & 00., Inc., Indianapolis, Ind., a corporation of Delaware Application February 10, 1942, Serial No. 430,113
'1 Claims. (Cl. 175-315) This invention relates to electrolytic condensers.
An object of the invention is to improve electrolytic condensers and the electrodes therefor, and particularly to improve dry electrolytic condensers.
Other objects of the invention will be apparent from the following description and accompanying drawing taken in connection with the appended claims,
The invention comprises the features of construction, combination of elements, arrangement of parts, and methods of manufacture and operation referred to above or which will be brought out and exemplified in the disclosure hereinafter set forth, including the illustration in the drawing.
In the drawing:
Fir-ire 1 shows the initial step in the meth of preparing a condenser electrode;
Figure 2 illustrates a subsequent step which comprises rolling the electrode between pressure v rolls;
Figure 3 illustrates a completed electrode;
Figure 4 is a section through a portion of a modified form of electrode; and
Figure 5 is a sectional view of a completed condenser.
This invention relates particularly to electrolytic condensers having at least one of their electrodes formed of a finely divided film-forming metal, such as aluminum, deposited in cohering finely divided form upon a porous flexible sheet base such as cloth or gauze. The film-forming metal is preferably deposited by a metal spray process using a metal spray gun wherein metal particles are sprayed and simultaneously heated or melted.
According .to the present invention the electrode element comprising a porous or fibrous base carrying a coherent adhering layer of finely divided film-forming metal particles, is subjected to pressure to reduce its thickness and compress the porous electrode metal layer. This is preferably accomplished by rolling the electrode between cooperating calendering rolls of hardened steel or the like.
While a preferred embodiment of the invention is described herein, it is contemplated that considerable variation may be made in the method of procedure and the construction of parts without departing from the spirit of the invention. In the following description and in the claims, parts will be identified by specific names for convenience, but they are intended to be as 2 generic in their application to similar parts as the art will permit.
Referring to the drawing, Figure 1 shows a method of producing the flexible electrode which comprises leading a strip of cloth l0 over a roller l i and simultaneously spraying a deposit of filmforming metal [2, such as aluminum, onto the cloth by a Schoop spray gun 13 as it is led over the roller.
While a variety of porous or fibrous bases may be used, the preferred material is a relatively loose woven open-mesh cotton cloth of high purity. Muslin, cheesecloth, cotton gauze and the like are especially suitable in the various weights and thread spacings obtainable commercially. The cloth should preferably'be bleached and unsized and free of impurities such as chlorides.
The spraying time and density are preferably regulated was to produce a sheet which is porous and flexible enough to roll without cracking but in which the sprayed metal particles are bonded together sufliciently to conduct electricity throughout the sheet, thereby forming a porous coherent and adherent layer of metal particles.
According to the present invention the electrode sheet or strip formed in this manner is compressed, as by rolling, as illustrated'in Figure 2. It will usually be found desirable to chemically clean the sheet electrode, however, before rolling. This may preferably be done by boiling the sprayed electrode for a short time, such as two minutes, in a dilute borax solution, such as a 0.1% borax solution. It is found that this cleaning before rolling results in an increase in capacity of the finished condenser. Or the borax cleaning will permit a greater reduction in thickness without increasing the power factor or reducing the capacity of the condenser produced from the electrode. It also reduces the power and chemicals required for electrolytic film-formation, shortens the aging time of the condns ers and results in a better shelf life and a longer operating life for the condensers.
The cloth layer 10 carrying spray deposited aluminum particles I2 is rolled and thereby reduced in thickness by passing it between a pair of cooperating steel rollers l4, l5 as shown in Figure 2, thereby resulting in a rolled electrode l8 which is thinner than the original sprayed cloth layer.
The rolls may be spaced so as to reduce the thickness of the electrode as much as 36%. Thus if the original thickness is .0165 inch on the average, the final thickness may be .0105 inch representing a reduction of 36.4%.
After rolling, the electrode is film-formed in a well-known manner. If the electrode has been cleaned before rolling. as described, it is beneficial to dry the electrode after rolling and before film-formation. Whether the electrode is rolled wet or dry is not material but it is undesirable to allow it to remain wet for any extensive period after it has been cleaned in the borax cleaning operation.
Figure 3 shows a completed condenser electrode comprising the rolled electrode layer I8 and a terminal I! secured thereto by punching the two parts together as indicated at l8.
The invention is also applicable to condenser electrodes formed of two cloth layers l9 and 20 cemented together by the film-forming metal spray deposit 2! as illustrated in Figure 4.
Figure shows a completed condenser comprising a condenser section 22 produced by winding together alternate electrode layers l6 and spacer layers of porous paper, cloth, regenerated sheet cellulose or the like. The condenser sectlon 22 is impregnated with a suitable film-maintaining electrolyte and inclosed in a container 23 having a laminated top 24. Terminal i1 passes through the laminated top and is connected to a soldering lug 25 mounted in the top. The opposite condenser electrode is connected to container 23 by a terminal strip 26 which is spun under the edge of the top.
The reduction in thickness brought about by rolling surprisingly does not reduce the capacity per unit area, of the electrodes. In fact, in most cases an increas in capacity has been obtained, the increase frequently amounting to or more.
The power factor and resistance of the condenser is not materially altered.
Due to the reduced thickness at smaller condenser section can be produced from the same area electrode making it possible to provide a smaller condenser unit for a given capacity. This also results in a saving in the amount of electrolyte used, this saving in some cases amounting to or of the electrolyte.
Life tests made on condensers using rolled electrodes are as good as or slightly better than those on condensers using sprayed electrodes which have not been rolled.
Rolling also insures better electrical conductivity throughout the electrode layer and increases the reliability of electrodes made from a single cloth layer sprayed with a relatively light coating of aluminum. While the rollin hardens the electrode layer slightly, it does not interfere With the winding of the electrode into a roll in producing a condenser.
The rolling step is simple and easy to perform and adds practically nothing to the cost of producing the electrodes.
While the present invention, as to its objects and advantages, has been described herein as carried out in specific embodiments thereof, it is not desired to be limited thereby but it is intended to cover the invention broadly within the spirit and scope of the appended claims.
What is claimed is:
1, An electrolytic condenser comprising cooperating electrodes and an electrolyte in contact therewith, at least one Of said electrodes comprising a compressed layer of finely divided cohering particles of film-forming metal.
2. An electrolytic condenser comprising cooperating electrodes and an electrolyte in contact therewith, at least one of said electrodes comprising a compressed layer of finely divided cohering particles of aluminum metal.
3. A dry electrolytic condenser comprising cooperating sheet electrodes wound together with porous sheet spacers impregnated with a filmmaintainin electrolyte, at least one of said electrodes comprising a fibrous sheet base carrying a compressed'adherin layer of cohering film-forming metal particles, said layer having a dielectric film thereon.
4.,A dry electrolytic condenser comprising cooperating sheet electrodes wound together with porous sheet spacers impregnated with a filmmaintaining electrolyte, at least one of said electrodes comprising a cloth base carryin a compressed adhering layer of cohering film-forming metal particles, said layer having a dielectric film thereon.
5. An electrode for electrolytic condensers comprising a cloth base carrying an adhering layer of film-forming metal, said layer comprising a compressed cohering spray deposit of aluminum.
6. A dry electrolytic condenser comprising cooperatin sheet electrodes wound together with porous sheet spacers impregnated with a filmmaintaining electrolyte, at least one of said electrodes compris ng a cloth base carrying a chemically-cleaned and compressed adhering iayer of cohering aluminum particles, said layer having a continuous dielectric film thereon.
7 A dry electrolytic condenser comprising cooperating sheet electrodes wound together with porous sheet spacers impregnated with a filmmaintaining electrolyte, at least one of said electrodes comprising a double thickness of open mesh cloth bonded together with a porous cohering spray-deposit of aluminum, said bonded electrode bein uniformly compressed so that its thickness is less than that of said electrode in the as sprayed condition, said spray-deposit having a dielectric film thereon.
JAMES MARVIN BOOE.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US430173A US2404824A (en) | 1942-02-10 | 1942-02-10 | Electrolytic condenser and electrode therefor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US430173A US2404824A (en) | 1942-02-10 | 1942-02-10 | Electrolytic condenser and electrode therefor |
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US2404824A true US2404824A (en) | 1946-07-30 |
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US430173A Expired - Lifetime US2404824A (en) | 1942-02-10 | 1942-02-10 | Electrolytic condenser and electrode therefor |
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Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2547371A (en) * | 1947-09-18 | 1951-04-03 | Everett D Mccurdy | Electrolytic condenser |
US2579250A (en) * | 1948-06-03 | 1951-12-18 | Robert M Brennan | Electrolytic condenser for use on alternating-current devices |
US2582744A (en) * | 1948-08-03 | 1952-01-15 | Joseph B Brennan | Method of making compact metal strip and electrode produced therefrom |
US2604517A (en) * | 1947-04-23 | 1952-07-22 | Everett D Mccurdy | Electrode and terminal assembly for electrolytic devices and methods of making same |
US2648119A (en) * | 1948-07-24 | 1953-08-11 | Joseph B Brennan | Anode for electrolytic condensers |
US2809940A (en) * | 1953-01-30 | 1957-10-15 | Napier & Son Ltd | Method of producing a silver catalyst |
US2873219A (en) * | 1954-12-20 | 1959-02-10 | Joseph B Brennan | Metal-coated batt and method and apparatus for producing same |
US2881368A (en) * | 1955-01-14 | 1959-04-07 | Gen Motors Corp | Vent cap for electrolytic condenser |
DE1129621B (en) * | 1954-12-20 | 1962-05-17 | Joseph Barry Brennan | Process for the production of metallized foil strips for electrolytic capacitors and arrangement for the implementation of this process |
US3055768A (en) * | 1957-11-29 | 1962-09-25 | Frederic H Lassiter | Metallized product and method of forming the same |
US4252575A (en) * | 1979-08-09 | 1981-02-24 | Sprague Electric Company | Producing hydrous oxide of controlled thickness on aluminum capacitor foil |
US20130008217A1 (en) * | 2011-02-18 | 2013-01-10 | Sumitomo Electric Toyama Co., Ltd. | Method for producing electrode for electrochemical element |
-
1942
- 1942-02-10 US US430173A patent/US2404824A/en not_active Expired - Lifetime
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2604517A (en) * | 1947-04-23 | 1952-07-22 | Everett D Mccurdy | Electrode and terminal assembly for electrolytic devices and methods of making same |
US2547371A (en) * | 1947-09-18 | 1951-04-03 | Everett D Mccurdy | Electrolytic condenser |
US2579250A (en) * | 1948-06-03 | 1951-12-18 | Robert M Brennan | Electrolytic condenser for use on alternating-current devices |
US2648119A (en) * | 1948-07-24 | 1953-08-11 | Joseph B Brennan | Anode for electrolytic condensers |
US2582744A (en) * | 1948-08-03 | 1952-01-15 | Joseph B Brennan | Method of making compact metal strip and electrode produced therefrom |
US2809940A (en) * | 1953-01-30 | 1957-10-15 | Napier & Son Ltd | Method of producing a silver catalyst |
US2873219A (en) * | 1954-12-20 | 1959-02-10 | Joseph B Brennan | Metal-coated batt and method and apparatus for producing same |
DE1129621B (en) * | 1954-12-20 | 1962-05-17 | Joseph Barry Brennan | Process for the production of metallized foil strips for electrolytic capacitors and arrangement for the implementation of this process |
US2881368A (en) * | 1955-01-14 | 1959-04-07 | Gen Motors Corp | Vent cap for electrolytic condenser |
US3055768A (en) * | 1957-11-29 | 1962-09-25 | Frederic H Lassiter | Metallized product and method of forming the same |
US4252575A (en) * | 1979-08-09 | 1981-02-24 | Sprague Electric Company | Producing hydrous oxide of controlled thickness on aluminum capacitor foil |
US20130008217A1 (en) * | 2011-02-18 | 2013-01-10 | Sumitomo Electric Toyama Co., Ltd. | Method for producing electrode for electrochemical element |
US8528375B2 (en) * | 2011-02-18 | 2013-09-10 | Sumitomo Electric Industries, Ltd. | Method for producing electrode for electrochemical element |
US9484570B2 (en) | 2011-02-18 | 2016-11-01 | Sumitomo Electric Industries, Ltd. | Method for producing electrode for electrochemical element |
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