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Shunt element
| Details |
Inventors: Fischer, Wilfried;
Assignee: Brown, Boveri & Cie AG (Mannheim, DE)
Primary Examiner: Walton; Donald L.
Assistant Examiner:
Attorney, Agent or Firm: Lerner; Herbert L., Greenberg; Laurence A.
Shunt element for an electrochemical storage cell or a group of several parallel-connected storage cells of the alkali metal and chalcogen type, with at least one anode space for the anolyte and a cathode space for the catholyte, which spaces are separated from each other by an alkali ion-conducting solid electrolyte wall and, at least in places, are bounded by a metallic housing. The shunt element has at least two directly adjoining spaces which can be connected to each other. The first such space is filled with a metal or with a decomposable metal compound. The second such space contains the contact surfaces of at least two electrodes which are arranged at a defined distance from each other. The first electrode is additionally connected to at least one electron-conducting surface of the first space. The two electrodes can be connected to the storage cell or cells. |
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DETAILED DESCRIPTION An object of the invention is to provide a shunt element for an electrochemical storage cell or a group of parallel-connected storage cells, which shunt element has a very high internal ohmic resistance when the storage cell or group of cells is intact, but which internal ohmic resistance, however, becomes very small if a defect occurs in a storage cell, and permits jumping the circuit through said storage cell or through the group of parallel-connected storage cells for any period of time desired.
With the foregoing and other objects in view, there is provided in accordance with the invention, a shunt element for an electrochemical storage cell based on alkali metal and chalcogen, with at least one anode space for the anolyte and a cathode space for the catholyte, which spaces are separated from each other by an alkali ion-conducting solid electrolyte wall, and at least in places, are bounded by a metallic housing, comprising a first chamber with its interior space containing a metal or a decomposable metal compound, a second chamber with its interior space having two spaced contact surfaces, said two interior spaces adjoining one another, connecting means through which said metal in the first interior space moves into said adjoining second interior space, a first electrode connected to one spaced contact surface and a second electrode connected to the other contact surface, said first electrode additionally connected to at least one electron-conducting surface of the first space, and said two electrodes adapted for connection to the electrochemical storage cell.
Other features which are considered as characteristic for the invention are set forth in the appended claims.
Although the invention is illustrated and described herein as embodied in a shunt element, it is nevertheless not intended to be limited to the details shown, since various modifications may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims
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Fuel Cells 
