Title: Housing for battery cell with protection for pressure and temperature

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Claims: I claim:

1. A housing for a rechargeable battery cell having first and second electrodes, including in combination:

a tubular member having first and second ends;

a closure for said first end having a first conducting contact thereon connected to a first electrode of the battery;

a conducting inner closure for said second end connected to the second electrode of the battery; and

a conducting outer closure for said second end having a second conducting contact thereon, said outer closure being movable from a first normal position in which said outer closure makes electrical connection with said inner closure to a second position in which said outer closure is spaced from said inner closure, said outer closure being responsive to a rise in temperature in the battery cell to move to said second position to open the circuit from said first and second conducting contacts to the electrodes of the battery.

2. A housing for a battery cell in accordance with claim 1 wherein said inner closure is porous and said outer closure responds to the pressure of the gasses developed in the battery cell as well as to the temperature thereof.

3. A housing for a battery cell in accordance with claim 1 wherein said outer closure is a bimetallic disc which snaps between said first and second positions in response to changes in temperature within the battery cell.

4. A housing for a battery cell in accordance with claim 3 wherein said inner closure is a porous shell through which gasses developed by the battery cell pass, and said outer closure responds to the pressure of the gasses developed in the cell as well as to the temperature thereof.

5. A housing for a battery cell having first and second electrodes including in combination,

a conducting terminal on said housing connected to the first electrode of the battery cell,

a conducting housing wall formed of bimetallic material which flexes in response to a rise in temperature, and

conductor means connected to the second electrode of the battery cell and engaging said housing wall for completing a circuit from said wall to the battery cell,

said housing wall flexing when the temperature of the battery cell exceeds a predetermined value to move out of engagement with said conductor means and open the circuit therefrom to the battery cell.

6. The housing of claim 5 wherein said conductor means is a porous inner wall of the housing through which gasses developed in the battery cell pass to apply pressure to said conducting housing wall to cause the same to flex and move out of engagement with said conductor means and thereby open the circuit from said housing wall to the battery cell.

Other info:

Inventors: Rackin, Mark H. (Sunrise, FL, US)

Application Number: 504210
Filing Date: 1974-09-09
Publication_date: 1976-01-20
Assignee: Motorola, Inc. (Chicago, IL)
Primary Class(es): 429/97
Other Classes:
US Patent Ref:

2269040	Jan, 1942	Rublee	136/179.
2289128	Jul, 1942	Kopf	136/182.
2651669	Sep, 1953	Neumann	136/179.
3373057	Mar, 1968	Jost et al.	136/179.
3617386	Nov, 1971	Bosben et al.	136/178.
3622397	Nov, 1971	Belove	136/181.

Other Refs:
Primary Examiner: Walton, Donald L.
Assistant Examiner:
Attorney: Southard; Donald B., Gillman; James W.