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Feedthrough assembly for lithium-iron sulfide cell
| Details |
Inventors: Sharma, Ram A.; Wright, Walter J.; Murie, Richard A.;
Assignee: General Motors Corporation (Detroit, MI)
Primary Examiner: LeFevour; Charles F.
Assistant Examiner:
Attorney, Agent or Firm: Grove; George A.
In an electrochemical cell having a molybdenum terminal rod extending through a metallic housing, a feedthrough assembly for insulating the terminal rod from and bonding it to the housing. The assembly comprises an insulating body of aluminum nitride, yittria or mixtures thereof surrounding the rod. The terminal rod is welded to a molybdenum ring integrally bonded to the insulating body. Also integrally bonded to the insulating body is a second molybdenum ring, which is electrically insulated from the first ring and is employed to attach the insulator to the housing. In a preferred embodiment, the construction is employed in a lithium-iron sulfide cell to hermetically seal the terminal rod to the housing. |
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DETAILED DESCRIPTION In accordance with the present invention a feedthrough assembly is provided for use in an electrochemical cell.
When employed in a lithium-iron sulfide cell, the improved feedthrough assembly provides an electrically insulating seal between the molybdenum terminal rod and the stainless steel housing which serves as the negative terminal.
In a preferred embodiment, the subject feedthrough assembly includes an annular ceramic insulator that is disposed about the terminal rod and is impermeable to air or the contents of the cell.
Suitable insulating materials include aluminum nitride, yittria or mixtures thereof, together with any additives helpful to form a dense body of these materials.
The terminal rod is welded about its periphery to an encircling molybdenum ring that is also at least partially embedded in the surface of the ceramic insulator.
This weld seals the terminal rod to the molybdenum ring-insulator assembly.
A second molybdenum ring, also at least partially embedded in the surface of the insulator and encircling the rod but insulated from it, is joined to the outer housing by a suitable welding procedure or the like.
The second weld completes the hermetic seal between the terminal rod and the housing.
The two molybdenum connector rings are physically separate and electrically insulated from each other.
Each ring is embedded in the insulator so that a hermetic bond is formed between it and the ceramic insulating materials.
The materials employed to construct the subject feedthrough assembly have similar coefficients of expansion.
Further, effect of differences in the expansion coefficients is minimized by the subject construction and especially by the embedded molybdenum bodies.
Thus, the seal remains airtight despite the large temperature changes to which the cell is subjected.
In the practice of the present invention, it is particularly advantageous to weld the one molybdenum ring to the terminal rod employing a molybdenum-rhenium fillet.
The second embedded molybdenum body can easily be joined to the housing by an intermediate ring constructed of metal chosen from the group consisting of tantalum, molybdenum or their alloys
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