DE202014101234U1 - Fixable electrochemical wet cell electrode holders - Google Patents

Abstract

Electrode holder for electrolytic vessels for the mechanical clamping / fixing and electrical contacting of electrodes, comprising a contact rod with a in its lower, intended for receiving and electrical contacting of an electrode part inseparably integrated or but detachably fastened / attachable contact tip, the contact tip α) a clamping device with a screw mechanism for mechanical clamping / fixing and electrical contacting geometrically demanding and / or one-sided kontaktierbarer electrodes diverse / changing geometric shapes and dimensions or β) for fixing and electrical contacting back contactable, in a circular form can be cut or stamped foil electrodes configured , By having a screw cap with a flat measuring opening down and a sealing ring in the edge region, by means of which screw cap a foil electrode surface and flüssigkei tsdicht on the contact tip can be pressed from below, or γ) for clamping / fixing and electrically contacting a soft metal wire is formed by having a screw cap with a sealing ring and a hole down for receiving and pressing a soft metal wire.

Description

The invention relates to electrode holders for fixing and electrically contacting different types of electrodes for measuring the conductivity in liquids contained in an electrolyte vessel, in particular in standardized standard ground joints, and a set of interchangeable electrode holders containing different types of electrodes fix and can contact electrically.

Common measuring cells for examining electrode materials on metal foils and electrolytes determine the geometry of the sample: The electrodes must be stampable or cuttable, be present on a planar metal current collector, be contactable from the back and often must not exceed a maximum thickness.

However, for the development and electrochemical investigation of electrode materials and electrolytes for battery and electrochromic applications, electrode holders are needed which have the greatest possible flexibility with regard to the measurable materials, electrode geometries and substrates.

Measuring cells and mounting concepts, which are designed for a specific electrode type, are here too inflexible and uneconomical. Electrode holders must be resistant to organic and inorganic solvents, be able to seal tightly with the sample measuring chamber for air, dust and moisture exclusion, and should have flexible mounting concepts that allow easy measurement of various types of electrodes. The electrical contact must always be guaranteed. In addition, they must be usable in transparent sample vessels to allow optical inspection of the electrochemical processes of all sub-elements (anode, cathode, electrolyte). Especially for battery development, a small volume of electrolyte is essential.

The object of the present invention is therefore to develop a dense and robust standardized electrode holder for various required during electrochemical investigations electrode geometries and sizes and in the above sense flexible electrode holder set of such standardized electrode holders, which allows different electrode geometries in a standard glass flask or in any electrolyte vessel with preferably standardized sleeve or core sections for receiving electrodes or in any open electrolyte vessel, for example, to combine a beaker and to vary flexibly depending on the requirements of the wet cell measurement to be performed.

In the field of solid electrodes, there are numerous products with replaceable probe head for receiving an electrode pin. Examples are electrode shafts with tips from Metrohm or analog holders from Pine Instrument Company. However, such electrode shafts only provide standard electrode materials such as gold, platinum, silver, tungsten, other metals or glassy carbon. Electrode foils or wires are not usable.

Geometrically demanding electrodes are often held with commercially available alligator clips (so-called "crocodile clips"), which however do not guarantee a robust fixation of the samples (electrodes). In addition, there are numerous electrochemical cells, z. B. of EL Cell, but which are only suitable for electrodes that are contactable from the back.

Bank Elektronik - Intelligent Controls GmbH offers a concept for an electrode set for holding planar, one-sided contactable electrodes as well as geometrically demanding samples with the electrode holders "Discfix", "WECLAMP" and "Tipfix", which allow the measurement of different electrode geometries as well as irregularly shaped electrodes. However, the main disadvantage here is that the size of the Discfix and Tipfix holders prevents them from fitting into commercially available glass bulbs. Due to the application for corrosion measurements, the associated electrolyte vessels require large volumes, which can not be provided in battery development.

The above-mentioned object of the invention is achieved by an electrode holder for electrolyte vessels, the contact tip of which may have three different, preferably mutually exchangeable embodiments, wherein the electrode holder is preferably equipped with a hollow stopper, which allows a sealing insertion into an electrolyte vessel.

• α) eine Klemmeinrichtung mit einem Schraubmechanismus zum mechanischen Einspannen/Fixieren und elektrischen Kontaktieren geometrisch anspruchsvoller und/oder einseitig kontaktierbarer Elektroden diverser/wechselnder geometrischer Formen und Abmessungen aufweist oder
• β) zum Fixieren und elektrischen Kontaktieren rückseitig kontaktierbarer, in eine Kreisform schneid- oder stanzbarer Folienelektroden ausgestaltet ist, indem sie eine Schraubkappe mit einer flächigen Messöffnung nach unten und einem dichtenden Ring in deren Randbereich aufweist, mittels welcher Schraubkappe eine Folienelektrode flächig und flüssigkeitsdicht an der Kontaktspitze von unten angedrückt werden kann, oder
• γ) zum Einspannen/Fixieren und elektrischen Kontaktieren eines Weichmetalldrahts ausgestaltet ist, indem sie eine Schraubkappe mit einem dichtenden Ring und einem Loch nach unten zur Aufnahme und zum Einpressen eines Weichmetalldrahts aufweist.

The electrode holder has a contact rod with a in his lower, intended for receiving and electrical contacting of an electrode part inseparably integrated or detachably attached thereto / attachable contact tip, wherein the contact tip

• α) a clamping device with a screw mechanism for mechanical clamping / fixing and electrical contacting geometrically demanding and / or one-sided kontaktierbarer electrodes of various / changing geometric shapes and dimensions, or
• β) for fixing and electrical contact back contactable, cut into a circular shape or punched foil electrodes is configured by having a screw cap with a flat measuring opening down and a sealing ring in the edge region, by means of which screw a film electrode can be pressed flat and liquid-tight at the contact tip from below, or
• γ) for clamping / fixing and electrically contacting a soft metal wire is formed by having a screw cap with a sealing ring and a hole down to receive and for pressing a soft metal wire.

In this embodiment, the electrode holder according to the invention can be fastened on / in the electrolyte vessel, for example by means of a clamp (eg a tripod clamp), such that the contact tip dips into the liquid located therein. He is thus suitable for any, possibly not tightly sealed electrolyte containers, such as beakers, electrolyte baths or open electrolytic flask.

In the following, the three different embodiments α), β) and γ) for the embodiment of the contact tips according to the invention are shown in more detail.

In the clamp holder configuration of the contact tip (Embodiment α)), the screw mechanism may, for. Example, with respect to the contact rod axis laterally, in particular perpendicular thereto, arranged / rotatable clamping screw, which can fix a clamping plate in the direction of Klemmschraubachse at different distances from the contact rod axis matching the thickness of the electrode. One possible configuration is shown schematically in 1 and the associated description below.

In particular, the clamping device may have a slot (an opening) laterally and / or downwardly with respect to the contact tip for receiving an electrode to be examined, so that the intended purpose clamped electrode from the contact tip z. B. hanging out like a flag down and / or can protrude laterally. It can be seen that even a thicker, z. B. parallelepiped or irregularly shaped electrode in the contact tip according to the invention according to this first variant can be fixed and electrically contacted.

In particular, the contact tip or the clamping device may be made of metal and two or more parts, wherein individual parts can be detachably mounted on the contact tip and held about with said clamping screw.

In the case of the film holder configuration of the contact tip (embodiment β)), this has a screw cap (eg made of plastic or glass) with a flat (generally circular) measuring opening downwards and a sealing ring in its edge region (in particular an O-ring). Ring), by means of which screw cap a (in particular circular) foil electrode can be pressed flat and liquid-tight at the contact tip from below. One possible embodiment and / or individual features are in particular the schematic representation in FIG 3 and the associated description below.

In the soft-metal wire holder configuration of the contact tip (Embodiment γ)), it has a screw cap (eg made of plastic or glass) with a sealing ring (in particular an O-ring) and a hole (in particular a notch) for receiving and for pressing a soft metal wire on.

One possible configuration and individual features are the schematic representation in FIG 2 and the associated description below.

Preferred embodiments of the invention are indicated in the dependent claims and in the following description.

The invention thus comprises three basic types of electrode holders with respect to the contact tip: clamp holders, electrode foil holders and soft metal holders. These three different types of holders (α), β) and γ)) are freely combinable with each other due to the invention therein standardized elements (contact rod, contact tip) and allow the electrical contacting and attachment of various types of electrodes, in particular electrode films, soft metal electrodes, solid state electrodes (in particular with irregular geometries) and unilaterally contactable electrodes as the cathode, anode, reference electrode and the like.

By inventively possible installation of an electrode holder according to the invention in any electrolyte vessels, the vessel volume is almost arbitrary. Furthermore, the use in transparent electrolyte vessels (eg those made of glass) is possible, so that electro-optical measurements can be implemented on a wide variety of systems.

The basic structure of the electrode holder according to the invention comprises an exchangeable or firmly integrated contact tip, which is electrically contacted via a contact rod (in short also: rod).

The contact rod is usually electrically insulated by a glass or plastic jacket. It may be in particular a Teflon jacket (PTFE jacket), z. B. a teflon tube with a constant diameter.

In a preferred embodiment, the electrode holder further has a hollow plug with which it is integrally or detachably connected. The hollow plug has a shape that enables it to be placed sealingly on a corresponding opening of an electrolyte vessel. For this purpose, the plug may have a conical core or a conical sleeve which can be sealingly connected to a / a corresponding sleeve or core in an opening of the electrolyte vessel. If the electrolyte vessel is a glass vessel, this can for example have a corresponding glass grinding. The plug can be made of the same material that makes up the outer shell (shell) of the contact rod. In this case, it is both possible that it is integrally connected to the electrode holder, as well as that it is detachable, the geometries are preferably designed so that it can be pushed onto the contact rod and remains by friction at the desired location, so that when using the electrode holder, this dives safely into the electrolyte solution without slipping off. A shoulder in the outer shell (in the jacket) of the electrode holder can possibly ensure that its slipping into the liquid can be avoided with certainty. For such embodiments, plastics and in particular plastics with good sliding properties such as Teflon are a suitable material for the plug and the outer shell of the electrode holder. Instead, the hollow plug may be made of a different material than the outer shell of the electrode holder. Thus, the hollow stopper may consist of a plastic such as Teflon, while the outer shell of the electrode holder is made of glass or vice versa. If glass is the material for the hollow stopper, the conical core or conical sleeve is preferably ground into the glass material. In this embodiment, the electrode holder according to the invention is particularly suitable for use with sealingly closable electrolyte containers.

The conical core or the conical sleeve of the hollow stopper has both in the case that the hollow stopper consists of a plastic material, and when the hollow stopper is made of glass, preferably a normalized outer diameter or a normalized inside diameter, in the case of Glass hollow plug thus a core or a sleeve with standard ground, especially in one of the following sizes DIN 12 594 : Core NS 14/23, sleeve 14/23, core 19/26, sleeve 19/26, core 29/32 or sleeve 29/32.

In a preferred embodiment, the contact rod is slidably mounted in the sleeve (i.e., in the hollow plug) with a sealing ring (eg, an O-ring) to exclude air and moisture. The additional option of providing a built-in gauge and, where appropriate, a mounting mechanism (such as detent grooves for the O-ring on the contact rod surface) for determining the contact rod height with respect to the plug, ensures precise and highly reproducible adjustment of the electrodes to each other, if required.

The contact rod is thus in particular slidably mounted and thus adjustable in height in the hollow stopper, sealed with an O-ring.

In all three variants of the invention, the contact rod can be an electrically conductive core, for. As a metal core of copper or brass, have. This represents, inter alia, the electrical connection between the arranged in the lower part of the electrode holder contact tip and a arranged at the opposite end of the contact rod connector for connection to an electrical device, such as a meter for current or voltage measurement. The electrically conductive core (metal core) can be integrally / inseparably or removably arranged or mounted in the contact rod.

In all cases according to the invention, the contact rod may end in its upper part with a screw having an internal bore for a plug for connection of the respective electrode to a measuring or reading device. As a result, in particular the above-mentioned metal core in the contact rod and thus in the electrode holder can be mechanically fastened or the electrical connection to the contact tip and thus be ensured with an electrode to be examined. The metal core may or may not be inseparable from the contact tip.

In particular, in an electrode holder having a detachable contact tip, a metal core may be provided which is integrally / inseparably formed / connected to the contact tip and may be taken out of the plastic jacket of the electrode holder together with the contact tip, the attachment of the metal core to the plastic jacket of the electrode holder being preferably in the upper, intended for current collection part of the electrode holder / plastic sheath takes place and for this purpose, preferably a metal screw is provided with an inner bore for receiving a contact plug.

In specific embodiments with exchangeable contact tips, the electrode holders of different types (α), β) or γ)) according to the invention can be converted into each other.

In embodiments with a conical sleeve (hollow stopper), the electrode holders according to the invention are preferably freely adjustable in the hollow stopper and close air- and moisture-tight both between the stopper and the contact rod (such as by means of an O-ring) and with the standard ground of the electrolyte vessel a manner known to those skilled in the art from the standard grinding technique.

Furthermore, the invention is directed to an electrode holder set, in particular consisting of electrode holders with a conical core or conical sleeve having hollow stopper, which can be used in particular in combination with such electrolyte vessels having conical, sealable openings, preferably those with conical ( standard) sections. In a variant, this electrode holder set has at least one electrode holder of each of the three variants α, β and γ, in order to allow the user to use any desired shaped electrodes as a cathode, anode or reference electrode.

• a) Einfache Anpassung und Kombinierbarkeit der Halter durch austauschbare Elektrodenspitzen, wobei das Halterungskonzept alle gängigen Elektrodentypen umfasst;
• b) Einsatz in beliebigen Elektrolytgefäßen mit bzw. ohne Standard-Schliffe;
• c) Freie Höhenverstellbarkeit, wahlweise mit Maßanzeige;
• d) Dichtigkeit und Chemikalienresistenz an allen Anschlussstellen.

In a preferred embodiment, in particular the combination of the following properties of an electrode holder or in the case of some or all electrode holders of a set is to be emphasized:

• a) Easy adaptation and combinability of the holders by exchangeable electrode tips, wherein the support concept includes all common electrode types;
• b) use in any electrolyte vessels with or without standard grinding;
• c) Free height adjustment, optionally with dimension display;
• d) Tightness and chemical resistance at all connection points.

• a) Die gegebenenfalls austauschbaren Kontaktspitzen sowie die frei wählbare Kombination aller drei Ausführungen (α), β) und γ)) in einem Standard-Glaskolben mit oder ohne Normschliffe ermöglichen die Befestigung und elektrische Kontaktierung einer Vielzahl denkbarer Elektroden, auch wenn diese unkonventionelle Geometrien aufweisen. Die in diesem Sinne flexible/anpassungsfähige Befestigung von zu untersuchenden Elektroden (Elektrodenproben) beliebiger Ausgestaltung ohne jede Einbuße in der Robustheit und Zuverlässigkeit der mechanischen Fixierung und der elektrischen Kontaktierung erlaubt die zuverlässige Analyse nahezu aller relevanten Materialien in der Batterieentwicklung, im Bereich elektrochromer Systeme sowie die Nutzung für die elektrochemische Grundlagenforschung auf Basis eines einzigen/gemeinsamen Elektrodenhalterkonzepts.
• b) Die Nutzung von Standardmaßen bzw. -Schliffen, insbesondere von genormten Schliffen, aber auch die Möglichkeit der Verwendung von Gefäßen ohne konische Öffnungen erlaubt den Einsatz einer Vielzahl an Gehäuseformen und -Volumina und ermöglicht so eine ökonomische Nutzung der Messzellen. Insbesondere sind auch transparente Glaskolben verwendbar, in welchen Oberflächenphänomene wie Gasung, Verfärbung oder Rissbildung direkt beobachtbar und dokumentierbar sind. In Verbindung mit entsprechenden Körpern aus optischem Glas können in-situ spektroelektrochemische und mikroskopische Untersuchungen durchgeführt werden. Die Anpassung an Standardgrößen der Kerne und Hülsen ermöglicht weiterhin die Kombination mit Standard-Referenzelektroden und weiteren kommerziell erhältlichen Bauteilen. Darüber hinaus kann das Elektrolytvolumen gegenüber handelsüblichen Systemen drastisch reduziert werden, was insbesondere beim Einsatz neuartiger oder teurer Elektrolyte ein wesentlicher Vorteil ist.
• c) Durch eine gegebenenfalls vorhandene Positionierungseinrichtung (bei Bedarf mit Maßanzeige) und die robuste (und damit sowohl in mechanischer als auch in elektrischer Hinsicht zuverlässige) Halterungsweise sind reproduzierbare und stabile Messungen gewährleistet. Die Elektroden können sehr nah zueinander platziert werden, was hinsichtlich der Verlässlichkeit von Messungen ein wesentlicher Faktor ist.
• d) Die gewährleistete gute Dichtigkeit ermöglicht die Verwendung der Messzellen in Laboratmosphäre ohne zusätzliche aufwändige Schutzgasvorrichtungen. Die hohe Chemikalienresistenz erlaubt den Einsatz zahlreicher protischer und aprotischer Elektrolyte.

The electrode holder concept according to the invention therefore has, in particular, the following advantages over the electrode holders known from the prior art:

• a) The optionally exchangeable contact tips as well as the freely selectable combination of all three versions (α), β) and γ)) in a standard glass flask with or without standard ground allow the attachment and electrical contacting of a variety of conceivable electrodes, even if they have unconventional geometries , The in this sense flexible / adaptive attachment of electrodes to be examined (electrode samples) of any configuration without any loss in robustness and reliability of the mechanical fixation and electrical contact allows reliable analysis of almost all relevant materials in battery development, electrochromic systems and the Use for basic electrochemical research based on a single / common electrode holder concept.
• b) The use of standard dimensions or grindings, in particular of standardized grinds, but also the possibility of using vessels without conical openings, allows the use of a variety of housing shapes and volumes and thus enables an economical use of the measuring cells. In particular, it is also possible to use transparent glass flasks in which surface phenomena such as gassing, discoloration or cracking can be directly observed and documented. In-situ spectroelectrochemical and microscopic investigations can be performed in conjunction with appropriate optical glass bodies. The adaptation to standard sizes of the cores and sleeves also allows the combination with standard reference electrodes and other commercially available components. In addition, the electrolyte volume compared to commercially available systems can be drastically reduced, which is a significant advantage especially when using novel or expensive electrolytes.
• c) By a possibly existing positioning device (if necessary, with dimensional display) and the robust (and thus reliable in both mechanical and electrical respects) holder way reproducible and stable measurements are ensured. The electrodes can be placed very close to each other, which is a significant factor in the reliability of measurements.
• d) The ensured good tightness allows the use of the measuring cells in laboratory atmosphere without additional elaborate inert gas devices. The high chemical resistance allows the use of numerous protic and aprotic electrolytes.

The central field of application of the electrode holders and electrode holder sets according to the invention lies in electrochemical analysis. Due to the high flexibility of the electrode holder set according to the invention, applications are possible in all areas of this field. In particular, such electrode holder are interesting for work in which frequently changing types of electrodes must be used and / or the electrolyte volume must be kept low. Typical examples are battery research (eg lithium-ion batteries), the characterization of electrochromic electrodes, spectroelectrochemistry and the development of electrochemical sensors and bio-sensors.

Further advantages of the invention will be explained below with reference to the embodiments illustrated in the figures and the associated description. These should have no limiting effect on the subject invention, but serve as concrete examples. The features shown therein / described may also be present in combinations other than those explicitly stated in an electrode holder according to the invention and / or combined with the features mentioned above. In particular, the figures are schematic representations that are not to scale.

Show it:

1 an electrode holder with a conical hollow plug (core) with a contact tip in the clamp holder configuration according to embodiment α) of the invention

2 a conical hollow plug (core) electrode holder having a contact tip in the configuration for supporting soft metal wires according to embodiment (b) of the invention

3 an electrode holder with a conical hollow plug (core) with a contact tip for electrode films according to embodiment γ) of the invention

4 schematic example of an inventive electrode holder set with each conical hollow stopper (cores) with three electrode holders according to the three different embodiments α), β) and γ) of the invention when used in an appropriate manner in an electrolyte vessel with three standardized grindings for receiving measuring electrodes

1 schematically shows an inventive electrode holder according to the first embodiment α) (clamp holder) for clamping geometrically demanding and / or one-sided kontaktierbarer (electrode) samples.

The electrode holder has a hollow plug with a conical core. The contact tip (short: tip) for the clamp holder configuration has a clamping device which mechanically fixes and electrically contacts electrode samples via a screw mechanism. Electrode samples can be conductive on both sides. The holder allows the installation of geometrically demanding samples with variable dimensioning, which is essentially limited only by the measuring cell or Elekrolytgefäßdimensionen and not by the electrode holder.

2 schematically shows an electrode holder according to the invention - also with hollow drop, which has a conical core - according to the third embodiment γ) for holding soft metal wires. There is here a contact tip, which has a notch or a hole for pressing a metal wire. By pressing a good electrical contact is ensured. For this purpose, the fixing and sealing via a screw cap (union nut) - in particular made of plastic, such as Teflon, or glass - with a sealing ring (in particular an O-ring), the diameter of which can be adapted to the thickness of the metal wire. In particular, in this configuration, a plurality of interchangeable plastic screw caps of different diameters for holding soft metal wires of different thicknesses may be provided for one and the same electrode holder.

In the 3 Fig. 12 is a schematic example of the electrode holder for electrode sheets according to the second embodiment β) of the invention. Such a configuration is suitable for cutting or punchable electrodes that are contactable on the back. Here, the contact tip represents a flat surface electrical contact that allows measurements at high currents. By using a screw sleeve (union nut) with a sealing ring (in particular an O-ring), a defined surface for electrically contacting a foil electrode is produced, which ensures electrical contact and at the same time seals the contact rod against the electrolyte.

For this purpose, the screw sleeve constitutes a screw cap (eg made of plastic or glass) with a flat measuring opening downwards and a sealing ring in its edge region, by means of which a foil electrode can be pressed flat and liquid-tight at the contact tip from below. In this case, the film electrode to be examined should have such a shape and size (eg cut or punched) that they can be inserted into the screw cap from the inside and close / cover the measuring opening completely and tightly, so that the electrode together with the sealing ring Seal between electrolyte and contact rod causes. For example, in the case of a circular screw cap, the lateral dimension of the electrode to be examined in each lateral direction should therefore be smaller than the inner diameter of the screw cap, and larger than the diameter of the measuring opening. In the case of deviating geometries of the screw cap and / or the foil electrode, the same applies. The electrode holder has a hollow plug with conical core, which has the same dimensions as in 1 and 2 illustrated electrode holder.

In 4 schematically an inventive electrode holder set with the intended use in a measuring cell (or electrolyte vessel) with three standardized sleeve openings each shown at the distal end of a provided for inserting an electrode round-section portion of the Elekolyt measuring cell purely schematically. The actual vessel can in particular be larger than shown and in any desired form, depending on the requirements of the measurement / examination to be performed. There may also be fewer or even more than three sleeve openings for electrodes.

By way of example, three electrodes - z. B. working electrode, counter electrode and a reference electrode -. For the purpose of demonstration, all three are different among themselves, i. H. belong to the three different variants of the invention, wherein, of course, the use of pairs of the same electrodes depending on the application may be useful. In particular, cyclovoltammetric measurements are possible.

In 4 the left electrode holder is a clamp holder according to the embodiment γ) of the invention, the middle electrode holder is a film holder according to the embodiment γ), and the right electrode holder is a soft metal wire holder according to the embodiment γ) of the invention. All three sleeve openings of the electrolyte vessel are standardized and have the same size, as well as the three hollow stopper with corresponding cores, which close these sleeve openings tight. As a result, the interchangeability of the contact rods or the entire electrode holder is guaranteed to each other.

The contact rods are each slidably mounted and thus adjustable in height in the hollow stopper, sealed with an O-ring. The respective contact rod is electrically insulated with a plastic jacket to the outside and ends in its upper part with a screw with an internal bore for the plug for connecting the respective electrode to a measuring or readout device. Each contact rod also has an electrically conductive core, z. B. of brass, which electrically connects the upper screw with the arranged in the lower part of the contact rod contact tip and thus with an electrode to be examined.

LIST OF REFERENCE NUMBERS

1

Mittelachse

2

Mutter

3

Messing

4

Kunststoff

5

Dichtung

6

Elektrode (zentrisch gespannt)

7

Probe

8

Überwurfmutter (Kunststoff)

9

Probe (quer)

10

Metall (2-teilig)

11

Stift

12

Schraube

13

Gewindebolzen

14

Dichtringe

15

Außenansicht Elektrode (innerer Aufbau wie mittlere Elektrode bis auf Probenhalterung)

Fig. 4

1

central axis

2

mother

3

Brass

4

plastic

5

poetry

6

Electrode (centered)

7

sample

8th

Union nut (plastic)

9

Sample (transverse)

10

Metal (2 parts)

11

pen

12

screw

13

threaded bolt

14

seals

15

External view of electrode (inner structure like middle electrode except for sample holder)

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited non-patent literature

• DIN 12 594 [0025]

Claims (16)

Electrode holder for electrolytic vessels for mechanical clamping / fixing and electrical contacting of electrodes, comprising a contact rod with a in his lower, intended for receiving and electrical contacting of an electrode part inseparably integrated or but detachably fastened / attachable contact tip, wherein the contact tip α) a clamping device with a screw mechanism for mechanical clamping / fixing and electrical contacting geometrically demanding and / or one-sided kontaktierbarer electrodes of various / changing geometric shapes and dimensions, or β) is designed for fixing and electrical contacting the back contactable, cut in a circular shape or punchable foil electrodes by having a screw cap with a flat measuring opening down and a sealing ring in the edge region, by means of which screw a film electrode surface and liquid-tight at the Contact tip can be pressed from below, or γ) for clamping / fixing and electrically contacting a soft metal wire is formed by having a screw cap with a sealing ring and a hole down to receive and for pressing a soft metal wire. An electrode holder according to claim 1, further comprising a hollow stopper with a conical sleeve or a conical core for sealing placement on an opening of an electrolyte vessel with a corresponding, designed as a core or sleeve opening, such that in each case the core of the hollow stopper in a sleeve formed as opening of the electrolyte vessel is sealingly fitted or vice versa, the sleeve of the hollow plug is sealingly placed on a core formed as opening of the electrolyte vessel, wherein the hollow plug is disposed about the contact tip above the contact tip and is either integrally formed with the outer sheath of the contact rod or is inseparably or removably seated or mountable thereon. Electrode holder according to claim 2, wherein the hollow stopper sealingly sliding and thus height adjustable on the contact rod is seated or can be placed. Electrode holder according to claim 3, wherein a sealing ring between the contact rod and the hollow stopper is present. Electrode holder according to one of claims 2 to 4, wherein the conical sleeve or the conical core of the hollow stopper has a normalized outer diameter or a normalized inside diameter, preferably of a size according to DIN 12 594, selected from: core NS 14/23, sleeve 14/23 , Core 19/26, sleeve 19/26, core 29/32 and sleeve 29/32. Electrode holder according to one of claims 4 or 5, which has a Maßanzeigeeinrichtung for adjusting the height of the hollow plug on the contact rod and / or a fixing or latching mechanism for fixing a desired height adjustment of the hollow plug on the contact rod. Electrode holder according to one of the preceding claims, wherein the contact tip is detachably fastened / fastened to the contact rod, in particular screwed to the lower end of the contact rod / can be. Electrode holder according to one of the preceding claims, wherein the contact rod is electrically insulated by a plastic sheath. An electrode holder according to any one of the preceding claims, wherein the contact rod has a metal core which is electrically connected / connectable to the contact tip and thereby to an electrode to be contacted, the contact rod and its metal core preferably top with a metal screw having an internal bore for receiving a contact plug concludes. Electrode holder according to claims 8 and 9 with a removable contact tip, wherein the metal core is integrally / inseparably formed / connected to the contact tip and can be removed together with the contact tip from the plastic jacket of the electrode holder, wherein the attachment of the metal core on the plastic jacket of the electrode holder preferably in the upper part of the electrode holder / plastic sheath intended for current decrease, and for this purpose preferably a metal screw with an inner bore for receiving a contact plug is provided. An electrode holder set comprising two or more electrode holders according to one of the preceding claims. An electrode holder set according to claim 11, wherein each of the electrode holders has a hollow plug with a conical sleeve or a conical core for sealingly seating on an opening of an electrolyte vessel having a corresponding opening formed as a core or sleeve, such that the core of the hollow plug in a trained as a sleeve opening of the electrolyte vessel is sealingly fittable or vice versa, the sleeve of the hollow plug on a core formed as opening of the electrolyte vessel is sealingly placed. An electrode holder set according to claim 12, comprising at least two or three electrode holders having two or three different contact tips selected from the contact tips as defined in α, β and γ as defined in claim 1. An electrode holder set comprising at least one electrode holder according to claim 7 and at least two or three different contact tips selected from the contact tips as defined under α, β and γ as defined in claim 1. An electrode holder set according to claim 14, comprising at least two electrode holders according to claim 7, wherein the or each electrode holder comprises a hollow plug having a conical sleeve or conical core for sealingly seating on an opening of an electrolyte vessel having a corresponding opening formed as a core or sleeve in such a way that in each case the core of the hollow plug in a sleeve formed as opening of the electrolyte vessel is sealingly fittable or vice versa, the sleeve of the hollow plug to a core formed as opening of the electrolyte vessel is sealingly placed. An electrode holder set according to any one of claims 11 to 15, wherein all the hollow stoppers of the electrode holders equally comprise either a conical sleeve or a conical core and the sleeves or cores have the same outer diameters or clearances.

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