DE1812757A1 - Device for processing especially the electrolyte fluid from accumulators - Google Patents

Description

Patent attorneys Dipl.-Ing. F. Weickmann, 1812757

Dipl.-Ing. H. Weickmann, D1PL.-PHYS. Dr K. Fincke Dipl.-Ing. F. A. WEICKMANN, Dipl.-Chem. B. Huber

ALBM S MÖNCHEN 27 DEN MOHLSTRASSE 22, CALL NUMBER 483921/22 GULP GENERAL ATOMIC IWCORPORAEION, 10955 John Jay Hopkins Drive, San Diego, California, V.St.A, Device for processing especially the electrolyte liquid

ability of accumulators

U.S. Patent No. 525,815 issued Jan. 4, 1966 describes an accumulator which has an electrolytic cell with a zinc anode and a porous inert oxygen cathode. Anode and cathode are distanced from each other, to provide a flow path for the electrolytic bite create. The electrolyte liquid circulates through it An oxygen-containing gas is supplied to the flow path and the cathode, whereby a zinc-oxygen reaction occurs.

Such an accumulator has significant advantages compared to other accumulators, such as the lead-acid battery The electrochemical pairing of zinc and oxygen has one high theoretical capacity and a high utilization factor in the anodic and cathodic reaction. Zinc is the most borrowed electropositive solid element, which consists of an aqueous 18-. Solution can be placed in an uncontaminated state. Oxygen is also light and can be «4m * of the atmosphere * can be removed, giving it an excellent position within

half of the gases in question for a reaction, because there is no need for weighty and cumbersome storage elements. The theoretical potential of the reaction: Zn + 1/2 O ₂ = ZnO

is 1.65 V and the actual voltage in the external circuit 1.4 V can be achieved. Potassium hydrate (caustic potash) or a similar caustic substance can be used as the electrolyte liquid can be used in an aqueous solution and air can be pumped to the pozosen cathode, weaving the required there Oxygen supplies, with the excess air in the electrolyte fluid got.

In order to achieve a high level of efficiency, the zinc oxides, which are formed as reaction products during the discharge, are eliminated from inside the battery cell. I'all this Reaction products are not eliminated from the accumulator, the use of a large supply of electrolyte liquid necessary to obtain the zinc oxides in a suspension and so that the solution retains a sufficiently pure concentration. The performance of the battery based on weight would be significantly reduced as a result. When the electrolyte liquid through the accumulator and one outside of the accumulators Circulating circulation system, the reaction products that have formed can largely from the vicinity of the surface of the The anode are kept away and the accumulator can therefore work with a smaller supply of electrolyte fluid. The electrolyte fluid floats the reaction products (zinc oxides) that have formed in the battery cell, out of the cell, where they can be removed from the electrolyte fluid.

Various problems will arise in constructing an energy conversion system as indicated above. Of course, the system should be designed in such a way that it is safe Notice of the reaction products of the zinc oxygen reaction from the electrolyte liquid and the separation should be like this

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be done quickly, because! 3 the necessary supply of electrolyte liquid can remain low in the system. It will also be desirable that the system be continuous as can only work when needed and until the battery is almost completely discharged. Another desirable property of the system can be seen in the fact that those responsible for the separation of the reaction products of the zinc-oxygen reaction from the Electrolyte liquid consumed power remains low, so that there is a high overall efficiency. In the end it is it is desirable that the system be compact and lightweight and that complex or expensive components be avoided.

The aim of the present invention is thus to create an improved energy conversion system with a long service life, compact design and high power output per unit weight.

Another object of the invention is the formation of an energy conversion system, which enables rapid and continuous separation of deposited zinc oxide reaction products from a circulating electrolyte fluid allows.

Another object of the invention is to provide an energy conversion system of the type described above with good efficiency, simple construction, inexpensive design and with a light weight.

The starting point of the invention can also be defined as a device for processing, in particular, the electrolyte liquid of accumulators, comprising an accumulator with at least one cell filled with electrolyte liquid, in solid reaction products are formed during the electrochemical reaction and a circulation system around the electrolyte liquid: ability to circulate through the cell.

The actual invention consists in the fact that a centrifugal separator is switched on in the circuit of the circulation system,

which separates the solid reaction products from the electrolyte liquid outside the cell.

Other parts of the invention will become apparent to those skilled in the art from the following description and accompanying drawings.

Fig. 1 shows a schematic view of the energy conversion system, which explains various principles of the invention, and also includes a partially cut-away Side view of a centrifugal separator with drive means,

FIG. 2 is a top plan view of that shown in FIG. 1 Centrifugal separator and the drive means.

An accumulator is used as an example of the energy conversion system with a depleted zinc anode, an oxygen cathode and an aqueous caustic electrolyte fluid used. It is also suitable for other chemical processes. For example, other electropositive materials can be used ι such as alkali metals are used for the anode. Instead of In addition to zinc, calcium or magnesium can also be used in the system described. Other electronegative ones can also be used for the cathode Materials can be used, e.g. can be used for the supply of oxygen- Fickelhydroxyd or Mercury Oxide “The electrolyte liquid would of course have to be chosen according to the material of the anode and cathode.

In general, the system described has for energy conversion an accumulator with a plurality of series-connected electrolytic cells, each of which has a zinc anode and has a porous inert oxygen cathode. Each cathode is removed from its associated anode, thus one Flow path is created through which the electrolyte liquid

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can circulate. The cathode becomes an oxygen-containing one Gas supplied. A circulation system continuously circulates the liquid through the flow paths. Part of the electrolyte fluid also circulates through a centrifugal separator, which removes the reaction products from the zinc-oxygen reaction removed from the electrolyte liquid during the discharge process of the accumulator.

Specifically, "described is a centrifugal separator and the like Drive that is incorporated into the system described above. The centrifugal separator has a rotating one Shell and a rotating screw, which are arranged to rotate with a speed difference, which necessary and suitable for the separation of the solid reaction products floating in the suspension from the electrolyte liquid is. First and second toothed pulleys, are driven by the engine, and third and fourth Toothed belt pulley is coupled with the casing or the worm · A first belt transmits the torque from the first to the third pulley and a second belt transmits the torque from the second to the fourth pulley. The teeth of the various pulleys have the same shapes, so the numbers of teeth on each of the pulleys are selected so that the predetermined speed difference between the jacket and the son corner results

In the following description, reference is made in particular to FIG. 1. The system has an accumulator 11 with a positive terminal 12 and a negative terminal 13. The accumulator has the type as described in the US patent application mentioned in the introduction. It has a variety of electrolytic cells held in series (not in FIG. 1 shown), each of which has a zinc anode and an oxygen cathode made of a porous inert material. Every Cathode is distanced from the associated anode and one

caustic electrolyte fluid - (such as an aqueous solution an alkali metal hydroxide, e.g. KOH) passes through the intermediate flow path while at the same time an oxygen-containing gas is supplied to the cathode. The reaction that takes place creates a potential difference between anode and cathode; to the desired voltage difference obtained between terminals 12 and 13 SU, a a sufficient number of electrolytic cells connected in series. An accumulator can, for example, be a group of 200 individual zinc-oxygen cells which can be connected in series and in parallel and have an energy of 60 to per charge Reach 75 kWh. The power output is 15 kW a nominal voltage of 240, 120, 60, 48 or any other voltage that results when 240 is replaced by an integer The quotient of 200 (number of cells) is divided. The energy of such an accumulator, based on the unit of weight, is in the order of magnitude of 133 to 200 Wh / kg and is retained even after repeated charging and discharging.

An air compressor or fan 14 is connected to the accumulator 11 to supply air to it. The air contains the oxygen for the zinc-oxygen reaction described above. The electrolyte liquid is circulated through the accumulator 11 by a pump 16. The pump 16 can be driven by a suitable electric motor (not shown) which receives its drive energy from the accumulator 11. The electrolyte liquid passes through the feed line 17 into the accumulator.

Hydrate Elektrolytfltissigkeit takes on its way through the accumulator 11, the resultant in the accumulator reaction products of the zinc-oxygen reaction with and transports them through the outlet 18 to the outside in a Sank 18a, the pump 16 sucks the liquid to the! Thanks 18a. About 5 to 10 # of the flow from pump 16 is going to centrifugal separator 19

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branched off, the greater part of the current passes through the feed line 17 back into the accumulator 11. The centrifugal separator can either be a mechanically rotated version, but it can also be a device that works on the cyclone principle.

The centrifugal separator 19 of Fig. 1 has a frustoconical shell 37, which is mechanically rotated so quickly around its axis in operation that a centrifugal acceleration occurs at its greatest circumference, which is a few hundred to a few thousand times as great as the acceleration due to gravity. To + this way, the electrolyte liquid which contains in suspension solid particles, after it is inserted in the rotating shell accelerates rapidly, namely almost to the speed of rotation and the centrifugal acceleration of the shell 37. Due to the high centrifugal acceleration seeks the electrolytic liquid to the maximum diameter of the jacket 37 and there forms a surface of approximately cylindrical shape regardless of the orientation of the jacket 37. The resulting level surface 38 is determined by the position of the outlet openings 49 in the end plate 4-8 of the casing 37. By changing the radial arrangement of the outlet openings 49, the position of the membrane surface 38 in the jacket 37 can be changed. Since the solid particles have a specific gravity greater than that of the liquid, they migrate through the liquid to the inner surface of the shell 37, where they collect. In order to continuously withdraw the agglomerated solid particles, the screw 24 rotates with its spiral-shaped blade in the shell 37, conveying the solid particles to the narrow end of the shell 37 in the typical manner of a screw conveyor the accumulated solid particles, which are still under the influence of centrifugal force, to fall outwards. The outlet openings 49 for the liquid are located at the wide end of the jacket 37

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η to a larger diameter than the outlet openings 64 for the solid particles, so that the level surface of the liquid remains at a larger diameter than the outlet openings 64. The spiral blade of the snail 24 is located on a screw jacket 23, which rotates relative to the jacket 37. The screw jacket 23 is attached to a cover 26 and is also driven by this. The cover 26 has a hollow inner shaft 28, by means of which the torque from the fourth pulley 67 is introduced.

The frustoconical shell 37 with the screw 24 and her rigid screw blade as well as its suspension and its drive means within the shell 37 is at its wide end covered by an end plate 43. This end plate 48 has an outer shaft 52 which is supported by a roller bearing 54 is held and the torque from the third pulley 68 to the end plate 48 and the jacket 37 transmits. The jacket 37 is also held by a second roller bearing 42 by means of a shaft journal 41 »which from an end plate 39, which can simultaneously form the bottom of the jacket 37, grows out. The inner one driving the cochlea 24 Shaft 23 and the cover 26 v / earth opposite the jacket 37, the outer shaft 52 and the end plate 48 by a Plain bearing bush 51 and a washer 53 for the axial thrust centered or held. The thickness of the disk 53 can vary in order to adjust the radial play between the jacket 37 and the screw 24.

The electrolyte liquid enters the interior of the centrifugal separator 19 through an inlet pipe 21 which lies within the concentric shafts 28 and 52. The inlet pipe 21 extends to the inside of the snail shell 23 »where its open end lies. This is where the electrolyte fluid enters contains the reaction products of the zinc-oxygen reaction,

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from 'and is through the openings 36 in the screw jacket 23 moved into the area between the jacket 37 and the screw jacket 23. The separation then takes place in this area the solid particles from the electrolyte liquid as described above.

The principle of mechanical separation of solid parts with a relatively higher specific weight from a fluid in the vicinity of a rotating frustoconical shell, as described above _; and the continuous removal of the accumulated solid particles by means of a screw conveyor within the shell, as essentially described, is now known in chemical engineering and related industries.

The inlet pipe 21 can be a non-rotating part which is held in its position concentric to the axis of rotation by sliding bearings 31 and 33 which are pressed into the rotating inner shaft 28. The upper slide bearing 31 has a flange 29 which extends over the upper end of the inner shaft 28 and which serves as a thrust bearing for a ring 90. The ring 90 at the upper end of the inlet pipe 21 supports the upper end of this inlet pipe 21 in such a way that it hangs into the jacket 37 as far as is desired. f The inlet pipe 21 empties the electrolyte liquid against a deflector 88 which is arranged inside the screw jacket 23. Br is shaped to DA8 of the wait-directed current derElektrolytflüseigkeit gently to the walls of the worm jacket 23 is deflected down. If this appears to be desirable, the deflector 88 can be designed in such a way that suitable radially arranged vanes 89 accelerate the entering electrolyte liquid effectively to the circumferential speed of the screw jacket 23. As soon as the liquid begins to rot within the screw jacket 23, learns

she has a centrifugal force, which forces her to duroh dl · Yielaahl ·

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of the openings 36 to flow outward. The openings 36 lie next to those surfaces of the screw blades which the pushed solid particles abut or intersect even with these surfaces. The liquid flowing through the openings 36 is therefore more likely to spread over them Spread out surfaces and become distracted by them, rather than against the walls of the shell 37 to bounce. This feature contributes to the fact that the accumulated solid particles settle on the mantle 37 evenly and at the same time prevents locally increased wear on the screw 24.

The screw is driven by the motor 74 and drive means, which will be described below, to a speed in the Of the order of 1,600 to 8,500 rpm. The speed is determined by the diameter of the jacket 37 and by the desired The amount of centrifugal acceleration at this diameter is determined. The motor 74 is a DC motor with terminals 30 and 35, v / elche via a suitable Control unit 91 are connected to terminals 12 and 13 of the accumulator in order to draw the current from there.

As already described, the one with a relatively high speed rotating jacket 37 at its further end through the roller bearing 54 and at its narrow end through the roller bearing 42 supported. The roller bearing 42 is mounted in a support ring 43 which is formed by several ribs 46, one of which can be seen in FIG. 1 is supported against a lower plate 44. The lower plate 44 forms a support for the centrifugal separator 19 and can be part "of a suitably mounted frame, not shown in the figure. The roller bearing 54 at the wide end of the jacket 37 is supported by a cover plate 56 The housing of the centrifugal separator 19 is held.

The electrolyte liquid which flows out of the jacket 37 through the exit openings 49 in the end plate 48,

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collects in an annular chamber 57 which passes through the coarial cylinders 58 and 59 are formed. The two coaxial cylinders 58 and 59 extend from the lower plate 44 me upwards. The outer of the two coaxial cylinders 58 has at its upper linden a ring 60 attached thereto. Servant ring 60 is in a suitable manner with the cover plate 56 connected. An outlet pipe 61 is in communication with the lower end of the annular chamber 57. In the annular chamber 57 accumulated electrolyte liquid can be removed by this The outlet pipe flows out of 61 and returns to the tank 18a through line 6 °.

The various elements of the system described result in their cooperation in an improved energy conversion system, which is suitable wherever a long service life, a compact design and a high output per unit weight are desirable. The separation of the zinc-oxygen reaction products from the electrolyte liquid, the separation effect, or the dryness is carried out to a πehr effective Veise. in the use of a centrifugal separator the Zinkoxydprodukte fall dry and closer to than other separation method such as filtering, and the separation takes place even more quickly when other methods. of solid Particles can be varied over a wide range by influencing the centrifugal force, the flow of liquid or other parameters .

The mode of operation of a centrifugal separator of the type described is based on the formation of a small differential speed between the two rapidly rotating concentric parts in the jacket 37 and the screw 24. The high speed causes centrifugal forces, which result in the heavier components in the electrolyte liquid being quickly deposited radially outward to have. The relative movement of the spiral blades of the screw 24 with respect to the shell 37 pushes the deposited heavier particles along the inner surface of the conical

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Shell 37 downwards towards the bottom of shell 37 and generally opposite to the direction of movement of the Liquid. The outlet openings 64 in the wall of the shell 37 next empty its bottom into the storage container 66, where the mud or swamp builds up. The solid reaction products which pass through the exit openings 64 ″ are located generally in the state of a thick paste. The resulting zinc oxide reaction products are stored for later use To be able to use recharging of the accumulator 11 for the regeneration of the zinc anode. Appropriate means are provided (not shown in the figures) to remove the zinc oxide reaction products during charging to the stream of electrolyte liquid traced back.

In the case of a suitable operating mode, the rotational speed differential between the jacket 37 and the screw 24, which is typical for the system, is in the order of magnitude of 5 to 100 rpm. The speed of the jacket On the other hand, with a largest diameter of approximately 10 cm, 37 is of the order of 1600 to 8500 rpm. To a Shell speed of 6000 l / min, for example, a screw speed of about 6060 l / min can be selected, this corresponds to a differential speed of 60 l / min. The differential speed must be maintained by a form-fitting drive v / earth, so that it cannot be influenced by any slippage of the drive means. This arrangement is necessary because a large part of the drive power of the entire device is required to achieve the differential speed maintain. The reason for this is the relatively high frictional force between the jacket 37 and the worm 24, which by the Pasty consistency caused the layer of solid particles is and which the jacket 37 and the screw 24 on the want to bring the same speed.

To obtain the previously set difference, a positive gear drive could be used to drive the jacket 37 and the screw 24 can be used. Such gear transmission

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with a large gear ratio are generally cumbersome, expensive, heavy and power-consuming. The costs and the extra power consumption of such a gear transmission are often bearable for relatively large and expensive stationary systems, in other words with designs that can occur in the manufacturing industry. Wherever weight, compactness, simplicity, and lower power rating have been desired, gear drives are usually unsatisfactory. Furthermore, the Elektrolytflissigkeiten and the various operating conditions different differential speeds may be desirable depending on the different species, and a gear mechanism is generally not a simple change% of gear ratios.

In accordance with the present invention, a pair of toothed belt drives are provided used to get the desired speed difference. The toothed belts usually consist of a flexible molded part with teeth for engagement in corresponding gaps between the teeth of matching special pulleys. These drives are simple and do not place high demands on the Tolerances, in contrast to the typical gear sets with the tight tolerances, which are here in the toothing and assembly are necessary. Furthermore, these drives are relatively compact, not heavy, quiet in operation and they work with little vibration. Tooth J Belt drives are also more efficient than gear drives with a low gear ratio and a change in gear ratio is possible with a simple change.

In the particular embodiment, a fourth pulley 67 is attached to the upper end of the inner shaft 28 of the worm 24 in a suitable manner. Similarly, a third pulley 68 is attached to the upper end of the outer shaft 52 of the shell 37. Two driving pulleys 71 and 72 are located together on a motor shaft 73 of the motor 74. A second toothed belt 76 couples the second ^K i emenschei.be · 71 and the fourth pulley 67 drehmomentsohltissig · A first tooth

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Belt 77 connects the first pulley 72 and the third Belt pulley 68 torque-locked. The ratio of the speeds of the worm 24 and the driving motor 74 int reversed proportional to the ratio of the number of teeth of the fourth pulley 67 and the second pulley 71. Analogous the speed ratio of the driven shell 37 and the driving motor 74 is inversely proportional to the number of teeth the third pulley 68 and the first pulley 72.

It is thus:

^β fi ^and ■
ⁿ l ^Z 3 ⁿ 2 ^Z 4

here means:

η, = n "engine speed

η. Speed of the screw 24

n. speed of the jacket 37

z, number of teeth of the first belt pulley 72 on the motor 74 that drives the worm 24

ζ «Number of teeth of the second driving the jacket 37 Pulley 71 on engine 74

z, number of teeth of the driven third belt pulley 68 ⁵ on the worm 24

z. Number of teeth of the driven fourth pulley 67 ⁴ on the motor 37

Since n, is constant, the speed difference between the Define screw 24 and jacket 37 as follows:

4 ^{n Z} 3 ^Z 2
In a numerical example, the following values can be given, for example »

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The first pulley 72 with 20 teeth (Z ₁ ) drives the third pulley 68 of the worm 24, which has 19 teeth (z-) and the second pulley 71 with 21 teeth (Zp) drives the fourth pulley 67 of the casing 37, which has 20 teeth Teeth (z.). Then"

ⁿ * _ gO.20 = 400 _ - Q ₀₂ ^ ₁
-2. - Τ5Γ75Τ W $ ~! ' ⁰ ^? ¹

^A ". ■

It follows that at a speed of 6000 l / min the screw 24 will do about 15 l / min more than the jacket 37. (approx. 2.5 l / min more at a speed of 1000 l / min).

The differential speed changes greatly with only a very small change in the size of one or more pulleys. Vie η η e.g. with two belt pulleys the number of teeth is changed by one tooth, it follows:

ζ - M ■ f $ ■ 1. ° ™

The differential speed is now about 1 $ of the speed of the Mantle ^ 7, or about 10 l / min at 1000 l / min of the jacket 37. In this way a variety of different speed differences can be achieved can be achieved, the center distance fluctuating only within tolerable and adjustable tolerances.

The adjustability of the center distance is achieved in that the motor 74 is mounted on a plate 78 in such a way that the loosening of one or more screws allows fine adjustment. The plate 78 pivots about a bolt 75 which is fastened in a frame plate 79. The cover plate 56 of the centrifugal separator 19 is screwed to the frame plate 79, which has a recess 80 which is so large that the third pulley 68 fits into it. The axis 74 of the motor 74 penetrates the plate 78 in an opening (not shown)

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and in a larger opening, also not shown, which Frame plate 79. Two bolts (screw bolts) 81 and 82 extend through guide grooves 83 and 84 in the frame plate 79. As soon as the PMte. 78 has been pivoted about the bolt 75 and has reached its desired position, the bolts and 8 ?. tightened and the plate 78 is thereby clamped together with the frame plate 79.

After the two toothed belts 76 and 77 normally not will fit exactly to the same center distance, the play in the slack toothed belt is eliminated by a tensioning pulley 86. The tension roller 86 is pivotable or in a different manner "is fastened, for example by a screw 89 which extends through a Bore in the eye 88 extends. In this way, the belt that is not tensioned can pass through the belt resting against its outer surface Tension roller 86 are deflected so that the wrap angle between the toothed belt and the relevant pulleys gets bigger.

The described toothed belt drive for the centrifugal separator 19 forms a positive drive for the differential speed between the son corner 24 and the jacket 37. This is done in a simpler way with significantly lower costs and costs with a higher efficiency than with a gear transmission. By changing and adapting relatively few parts different speed differences can easily be achieved. The drive described is compact, light in weight, and quiet and free from body vibrations - it therefore has particularly advantageous properties for use in the drive of a vehicle.

- Patent claims -

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Claims (1)

¹¹¹¹¹¹ T ¹ B ¹¹ :! ' !?!.. ^{1;, 1} J ^"1 !! ¹ X" ■ ": -; ■ ■■■ ■■■ ,,, ■ Claims 1. Device for processing, in particular the electrolyte liquid from accumulators, comprising an accumulator (11) with at least one cell filled with electrolyte fluid, in which solid reaction products are formed during the electrochemical reaction, as well as a rolling system to circulate the electrolyte fluid through the cell, characterized by the fact that a centrifugal separator (19) is connected in the circle of the titanium rolling system (16,17,18), which the solid reaction products separates from the electrolyte liquid outside the cell. 2. Device according to claim 1, characterized in that the daduroh Centrifugal separator (19) in a collecting and storage container (66) for the solid reaction products that have been separated out, in order to supply them again when the accumulator (11) is charged * 3. Device naoh one of claims 1 and 2, characterized in that the centrifugal separator (19) of a motor (74) 1st driven, which is connected to the accumulator (11), 4 · means NaOH any one of claims 1 to 3 »daduroh in which an old a predetermined speed the rotating shell (37) and one with a% different speed rotating · worm (24) of the centrifugal separator (19) dl · solid reaction products to separate from the electrolyte liquid that a first and second toothed belt pulley (72, 71) driven by the motor (74) and a third and fourth toothed "belt pulley (68, 67) for driving the jacket" (37) and of the worm (24) -provisions that a first toothed belt (77) connects the first and third pulley in a torque-free manner - (72, 68) and a second toothed belt (86) connects the second and fourth pulley (71, 67) with torque and that the first, second, third and fourth pulley (72.71 * / .68.67) are provided with such a number of teeth that a proper rotation lower part between jacket (37) and screw joint (24) is achieved. '. »09127 / itU - 18 - - Io - 5. Device according to one of claims 1 to 3, characterized in that that in the accumulator (11) the electropositive material Elemental zinc is that the electronegative material is oxygen and that the zinc oxide reaction products formed during the reaction can be flushed out of the cells by means of an aqueous, caustic solution. 6, device according to claim 4 »characterized in that the Shell (37) and the screw (24) rotate about a common axis, and that the shell (37) has a frustoconical shape Beeitzt that the jacket (37) outlet openings at both ends (49 »64) for the electrolyte liquid or for the solid reaction products and that two coaxial hollow shafts (28, 52) protrude upward from the centrifugal separator (19), one of which the outer, shorter shaft (52) is attached to the jacket (37) and at its end remote from the jacket the third pulley (68) for carries the drive of the shell (37), while the inner, longer shaft (28) is attached to the screw (24) and to his The fourth pulley (67) for the drive at the end far from his corner the screw (24) carries. 7. Device according to one of claims 4 and 6, characterized in that that a tension pulley (86) is provided for at least one of the toothed belts (76 or 77) ifct « 909827 / 11U