The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 20, 1976
Filed:
Sep. 09, 1974
Mark H Rackin, Sunrise, FL (US);
Motorola, Inc., Chicago, IL (US);
Abstract
A housing for a battery cell includes a built-in switch for opening the circuit to the battery in response to excess pressure and/or temperature. The housing has a first conducting contact connected to the first battery electrode, and a second contact connected to the second electrode and connected through a wall of the housing to provide a circuit to the battery cell. The second contact may be a porous wall to allow gasses which form in the battery cell to pass to the outer housing wall, and when the pressure exceeds a predetermined value the outer wall will flex and open the electrical connection to the battery. The outer wall can be a bimetallic disc which flexes with rise in temperature of the battery cell to open the connection when the temperature exceeds a predetermined value. The pressure responsive action can be provided alone, the temperature responsive action can be provided alone, or the two features can be used in combination to provide a housing wherein the connection to the battery is opened in response to excessive pressure or temperature, or a combination of the two conditions.