US2613234A

US2613234A - Plug or septum for electrolytic cells

Info

Publication number: US2613234A
Application number: US128449A
Authority: US
Inventors: Eppley Marion
Original assignee: Eppley Laboratory Incorporated
Current assignee: Eppley Laboratory Incorporated
Priority date: 1949-11-19
Filing date: 1949-11-19
Publication date: 1952-10-07
Anticipated expiration: 1969-10-07

Description

Oct. 7, 1952 M. EPPLEY PLUG OR SEPTUM FOR ELECTROLYTIC CELLS Filed Nov. 19. 1949 r/vav It!!! IN V EN TOR.

J/Zarion J7 liar-news Patented Oct. 7, 195 2 LLS MarionEppley, Portsmouth, R. I., assignor to The .Eppley Laboratory, Inc., Newport, R. I., a. corporation of Rhode Island Application November 19, 1949, Serial No. 128,449

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This invention relatesto 'new and useful improvements in standard electric cells.

In practice, the volt is established by a cell or battery. The constituents of this cell are generally contained in a glass vessel which usually has the form of an H. At the bottom of the two arms or limbs of the cell thus formed are generally platinum wires sealed through the glass. The top of each limb is usually sealed oii to prevent evaporation. v

In cells of this type especially the portable cells, the ingredients or certain constituents of the cell must be separated by means of suitable plugs or septa. For instance, in some cells the main upper portion of the cell is filled with a solution of cadmium sulfate whereas the limbs are filled with other ingredients and it is necessary to dispose a plug or septum between these ingredients. Previously plugs of porcelain have been used. Later plugs of perforated cork covered with linen have beenemployed. However, it has been found that materials contained in the cork and porcelain, which were not removed, acted adversely upon the behaviour of the cell.

A main object of the present invention is to provide a simple, efiicient, and durable arrangement of plug and associatedelements whereby the hysteresis of the cells thus produced have not been affected in over a year of repeated tests.

In brief and general terms, the invention relates to the provision of a plug or septum for such cells formed of non-porous material. Preferably, this material is a synthetic plastic'material of the non-porous type. Also preferably, these non-porous plugs of synthetic material are so formed as to be springy'and be associated with certain covering layers of material such as linen and/or paper to form a proper seal be-. tween the lowerlimbs of the cell and the upper portions thereof. 1 s r In further particulars, th invention relates to the specific form of the improved plug and to the particular association with it of layers of linen and/or paper. Furthermore, the invention relates to a special structure of plastic plug with a special form of linen covering.

The present preferred forms which the invention may assume, are illustrated in the drawings, of which: a

Fig. 1 is a vertical cross section through a cell showing the application of the invention thereto;

Fig. 2 is an enlarged vertical partial cross section through a limb of the-cell showing one form of plug and covering layers;

Fig. 3 is a similar view showing the improved plug with a different arrangement of covering layers;

Fig. 4 is an enlarged perspective view of the improved form of plug;

Fig. 5 is an enlarged cross section vertical view of 'a modified form of plug and showing the construction for sealing it into the limb of the cell;

Fig. 6 is an enlarged vertical cross sectional I view of a stilliurther modified form of plug;

Fig. 'I is a horizontal section taken on the line l"l of'Figure 6; and,

Fig. 8 is a particular form of covering layerto be noted that th invention has to do with improvements in voltaic electric cells which are used as standards for purposes of comparison and testing. In the drawings, in Figure 1 a cell form generally denoted by the letter A, is shown embodying my invention andhas two vertical limbs l0 and II which at a medial point, are connected by a cross tube I2. The main body of the cell in a particular instance, may be filled with the solution of cadmium sulfate l3. In the form shown, the lower portion of the left hand limb in acts as the positive connection or electrode as indicated by the plus sign, and the lower portion of the right hand limb ll acts as a negative connection or electrode as indicated by the minus-sign.

Intermediate the height of the lower portion of the limb I0, is disposed a plug or septum generally indicated by the letter B, andsimilarly disposed intermediate the height of the right hand lower portion of thelimb H, is a plug C.

The details or these plugs will be hereinafter described. These plugs or septa are disposed in the limbs for the purpose of separating the ingredients above them from those below. In the form shown, below the septum or plug B, may be disposed a suitable quantity of mercurous sulfate I4 and beneath this, a layer or portion of mercury I5 to which latter layer in any suitable manner, a connecting-wire I6 is associated.

Below the septum or plug C in the form shown, there may be disposed a portion or layer of cadmium sulfate solution l3 and beneath this, may be disposed a portionor layer of cadmium amalgam IT, to which latter'layer a connecting wire [8 may be associated in any suitable manner.

The function of these plugs or septa and their associated parts, is to hold the ingredients in place and separate. Previously, septa of porcelain and cork have been used, but for many reasons have been found to he unsatisfactory and also have been found to act adversely upon the behaviour of a cell. Considerable experimentation hasybeen conducted and septa of non-porous plasticxmaterial ,had been foundto possess qualities eminently suited for the purpose. Plastic materials to form these septa have included such well known materials as Lucite and Plastubing. These examples, which are only two of many which may be used, have been shown to give excellent results and did not efiect the .h

teresis of the cell adversely in more than a year of constant test and observation.

Referring now to the details of the plug or septum employed, reference may be had to Figure 4, which shows merely a preferred .form thereof. This septum or plug is in the form of an an u ar-body J9, th tic all o wh h is interrupted or split by a sloping slot 20 and the side walls of which are tapered as shown at 21, so that the upper diameter is slightly less than the lower diameter-for reasons which will be explained. This septum isof non-porous material andpreferably made of some of the modern non-porous plastic compositions now on the market. By reason of the shape and construction described, these septa are elastic and springy and consequently will automatically adjust themselves within the limb of the cell in which they are disposed and in association with suitable covering material to be described. The septum B disposed in the positive limb of the cell shown in Figure 1, isof the nature-and construction described with respect to Figure 4 and it is shown in place in the limb in enlarged form in Figure 3 As shown in Figure 3, the septum or plug I8 is surrounded atits sides and across one face preferably the bottom face, with a. double layer of linen. These layers are indicated by the

numerals

22 and 23. These. layers of covering' material, .whichlare interposed between the material below the plug and above the plug and on the sides-thereof, are firmly packed to seal the connection. The taperof the plug is to-pro- .vide ample space for the covering material to prevent its tendency to bunch up in this particular area. As thecovering layers are placed over and around the bottom and sides of the plug, the layers will tend to bunch up nearthe top portions of the sides of the plug. This is because more covering material collects than is necessary to cover the side surfaces of the plug. In order to compensate for the bunching and in order to provide a uniformly tight connection between the walls .of each limb o f-the cell and the plug therein at all points along the sides; of the plug, the plug is made with af-rustrurn shape, 1. e., it is tapered .downwat ly and outwardly. Thus there is ample space between the plug and the walls of the limb forthe bunched up material to collect without detracting from the tight seal.

With respect to the plug or septum C disposed in the lower portion of limb .li which'forms the negative electrode of the call, this is of the same material and construction as shown in Figure 4, but in this case, the covering layers are an outer layer of linen 24 which extends around the sides of the plug and across thebottom thereof and an intermediate layer of paper25, which extends around the side of the plug between it and the linen layer and only acrossthe solid bottom of disposed therein a sealing washer in the form of a series of bindings of string 30 which project .beyond the'outer face of the groove and contact the walls of the limb, which has been indicated .as-the limb l,l although of course, it is to be understood that that sort of plug can be used with theother limb a-lfdesired. This plug is provided with a covering layer of linen of the form shown in Figure 8, which has a main central portion 3-1 :to beedisposed across a face of the plug and having radially extending spaced arms 32 formed integrally thereon;,wl1ich;extend up the sides of the plug and whic are disposed in the lower groove 29 and held therein by a-suitable binding of string 3.3. Of course, :it-can be readily understood'that if necessary, a layer of paper may be used in connection with this linen layer 31 if desired. o

In :the form shown in Figure '7, a limb of the cell such as It andas shown in Figure 6, in vertical cross section, may be filled with aspiral coil of a flat strip of plastic material 3.4 of suificient length to Jill-the tube. This ofcou-rse. i of plastic elastic material which will tend to press out against the wali s of the limb. A prefer-red form of this material which has been used and proved satisfactOry, isnationallyknown under the name of Saran Tape and is a non-porousplastic. In a manner similar to the above constructions, this spiral roll of tape 34 has-a layer of linen 35 across one face anddisposedup along its sides between it and the inner walls of the limbwith which it is usedt rmedi tei a e sof othe material such a p p r m ybe emulo ed if desired and his form of plug may-be used-with either limb, as the occasion requires. Having thus in detail described the constructions of the several forms of ic t e inve tionrmyassume, it is cl arly anr e e that :1 av provided a simp efiicient, durable device zwhich' can be readily disposed within the cell as above described, to form an effective septum between the several ingredients in th limb, .Qf 51191 a nature as not to introduce into the electrQlytiemedium any deleterious substances.

The pl g'is springy and .elastic and non-porous, and is shaped tolneimit disposition therearound of suitable'layers oi covering material to permit a continuous path forcurrent flow and to prevent bunching of the material around the sides of the septum or plug, which bunching would lessen the effectiveness of the seal betweenthe plug and the cellinto which it. wasdisposed.

The several modifications shown are presented merely as indicative .of-I'variations of the main idea and which are adaptable for different special conditions and purposes.

While the invention 'has been described in detail and with respect :to the preferred form shown in the drawings, it is .not to be limited to such details and forms since many changes and modifications may he .made in the invention without departing from the, spirit and scope of the invention in its broadest aspects. Hence, it is intended to cover any and all fQ Z lS and modifications of the invention whiohmay come within the lanand porous material disposed tightly within the tubing, and said plug being split generally longitudinally.

2. In an electrolytic cell having a straight cyv lindrical portion of tubing. the combination with said tubing of a hollow frustrum shaped plug of non-porous synthetic plastic material and a, layer j Y of porous material covering the large end of the plug with the remainder of said layer passing over the plug toward the reduced end thereof, said plug and porous material disposed within the tubing.

and said plug tending to expand radially so that it has a tight fit within said tubing. 1

3. In an electrolytic cell having a straight cy. 1indrica1 portion of tubing. the combination with said tubing of a hollow frustrum shaped plug of non-porous synthetic plastic material and a, layer of linen covering the large end of the plug with the remainder of said layer passing over the plug toward the reduced end thereof, said plug and 3 said linen disposed tightly within the tubing, and said plug being split generally longitudinally.

generally longitudinally.

4. In an electrolytic cell having a straight cylindrical portion of tubing, the combination with said tubing of a hollow frustrum shaped plug of non-porous synthetic plastic material, a layer of porous material covering the large end of the plug with the remainder of said layer passing over the plug toward the reduced end thereof, a layer of paper intermediate said layer of porous material and the plug, said layer of paper covering the outer wall and the solid bottom of the plug only,

, said plug. Paper and porous material, all disposed tightly within the tubing, and said plug being split MARION EPPLEY.

REFERENCES orrEn The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 631,044 Heinrich Aug. 15, 1899 1,528,076 Rodman et al Mar. 3, 1925 1,645,146 Kinsley Oct. 11, 1927 1,649,525 Herold Nov. 15, 1927 1,760,178 Seitz May 27, 1930 2,176,427 Kershaw Oct. 17, 1939 2,456,355 Aber Dec. 14, 1948 2,484,593 Side c. Oct. 11, 1949