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Insulating enclosure for lithium batteries
| Details |
Inventors: Muffoletto, Barry C.; Kuwik, Raymond J.;
Assignee: Wilson Greatbatch Ltd. (Clarence, NY)
Primary Examiner: Skapars; Anthony
Assistant Examiner:
Attorney, Agent or Firm: Hodgson, Russ, Andrews, Woods & Goodyear LLP
A lithium electrochemical cell including an anode and cathode assembly with the anode connected electrically to a conductive cell casing and an insulated cathode conductor extending through a lid at an end of the casing and connected to a cathode lead near the lid and with a first insulating component for insulating the casing from cell components therein and extending along and within the casing from a closed end thereof toward the lid, and which is characterized by a second insulating component for insulating the lid from components in the casing and extending along within the lid and toward the first insulating bag so as to prevent a short circuit between the lid or casing and the cathode assembly caused by formation of lithium clusters in the region between the lid or casing and the cathode connector. Preferably the second insulating component is in the form of a cup having a relatively thin base portion extending along the lid and a relatively thin wall portion extending from the base along within the casing and toward the first insulating component which also is in the form of a thin-walled cup. The walls of the first and second insulating components preferably meet in overlapping relation. The insulating arrangement is particularly adapted for use in a cell wherein the anode and cathode assembly comprises a plurality of cathode plates with anode sections interposed therebetween. |
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DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENT An electrochemical cell generally designated 10 including the insulating arrangement according to the present invention is shown in FIG.
1.
Cell 10 includes a conductive casing of metal such as stainless steel closed at one end and having an opening at the opposite end thereof closed by a conductive lid 14, also of metal such as stainless steel.
In particular, casing 12 includes a bottom 16, a pair of upstanding spaced apart and substantially parallel sidewall portions 18, 20 and a pair of upstanding spaced apart substantially parallel end wall portions 22 and 24 which meet the sidewall portions at substantially rounded corners.
Lid 14 is welded in the open end of casing 12 to complete the cell assembly and is provided with terminal lead means 26 thereon for making electrical connection to a load in a manner which will be described.
Referring now to FIG.
2, the electrochemical cell 10 further comprises a lithium anode assembly generally designated 30 within casing 12 and connected electrically thereto in a manner which will be described, and a cathode assembly generally designated 32 within casing 12 and having cathode lead means generally designated 34 extending therefrom in a region near lid 14 in the completed cell 10.
Anode assembly 30 and cathode assembly 32 together comprise a cell stack assembly 35.
As will be described in detail presently, the cathode assembly 32 is electrically connected to terminal lead 26.
In preferred form, cathode assembly 32 comprises a plurality of plates, and the lithium anode assembly 30 has a plurality of sections interposed between the cathode plates.
In particular, and referring to FIGS.
3-5, the cathode plates 36 are arranged in a stack most clearly seen in FIG.
3.
Each of the cathode components or plates 36 comprises cathode active material, for example a mixture of silver vanadium oxide and a binder such as Teflon, pressed to form a pellet which then is enclosed in an envelope of separator material, for example polypropylene or polyethylene
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Metal Working 
