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| OF THE PREFERRED EMBODIMENT EXAMPLE 1 As shown in FIG. 1, after a SiO film 2 was deposited to a ... |
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Impact resistant rechargeable battery cell with crumple zone
| Details |
Inventors: Gyenes, Russell Ernest; Stanescu, Corina;
Assignee: Motorola, Inc. (Schaumburg, IL)
Primary Examiner: Martin; David
Assistant Examiner: Phan; Thanh S.
Attorney, Agent or Firm: Burrus, IV; Philip H.
This invention includes a spacer, preferably having a cross section resembling the letter "T", that is positioned between the electrode assembly and the metal can in electrochemical battery cells. The spacer allows a void to exist between the corner of the metal can and the electrode assembly. This "crumple zone" prevents any external damage to the can from damaging the internal electrode assembly. The invention facilitates passage of common OEM drop testing without compromising cell performance. The invention increases the reliability of the cell by allowing the cell to resist external impacts. |
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DETAILED DESCRIPTION OF THE INVENTION A preferred embodiment of the invention is now described in detail.
Referring to the drawings, like numbers indicate like parts throughout the views.
As used in the description herein and throughout the claims, the following terms take the meanings explicitly associated herein, unless the context clearly dictates otherwise: the meaning of "a," "an," and "the" includes plural reference, the meaning of "in" includes "in" and "on.
" Referring now to FIG.
5, illustrated therein is a cross sectional view of a prior art metal-can battery that has been repeatedly dropped on a hard surface as is typical in OEM quality and qualification practice.
For example, a typical qualification test may require the battery withstand 30 five-foot drops to a concrete surface.
Testing was done on common lithium-ion metal-can cells in the lab.
Test results showed that on average 7 batteries in 500 failed this test, with an average of 4 failing within the first 18 drops.
Nothing would be more frustrating for a consumer than to pay $200 for a new personal organizer only to drop it a couple of times and have it stop working! As shown in FIG.
5, the failure is caused by deformation 502 of the metal can 500 causing damage 503 to the inner jellyroll 501.
As stated above, this damage 503 can cause short circuits within the cell.
Referring now to FIG.
6, illustrated therein is a cell assembly in accordance with the invention.
A jellyroll 600 with cathode 601 and anode 602 is provided.
The jellyroll 600 will be inserted into a metal can (not shown).
The assembly includes a first metal connector 603 that serves as the external cathode and a tab 604 for coupling the first metal connector 603 to the cathode 601.
An insulator 605 is provided to isolate the first metal connector 603 from the anode 602.
Flat, top insulators, at one end of the jellyroll 600, are known in the art as recited in U.
S.
Pat.
No.
6,317,335 to Zayatz.
In accordance with the invention, the jellyroll 600, which would normally contact the bottom of the metal can, has been shortened
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