US 12,272,844 B1
Pressure activated battery system
Jason Cahayla, Kinnelon, NJ (US); and Barry Schwartz, Newton, NJ (US)
Assigned to The United States of America as Represented by the Secretary of the Army, Washington, DC (US)
Filed by U.S. Gov. as Rep'd by the Secretary of the Army, Picatinny Arsenal, NJ (US)
Filed on May 10, 2023, as Appl. No. 18/315,218.
Int. Cl. H01M 6/38 (2006.01); F42C 15/33 (2006.01); H01M 50/682 (2021.01)
CPC H01M 6/38 (2013.01) [F42C 15/33 (2013.01); H01M 50/682 (2021.01); H01M 2220/30 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A pressure activated battery system for a projectile wherein ballistic pressure for launching the projectile transitions the pressure activated battery system from an inactive state to an active state by translating a piston to activate a reserve battery, said pressure activated battery system further comprising:
a housing further defining a front cavity and a rear cavity connected by a central hole, said rear cavity comprising a slip fit region exposed to an external environment and a press fit region forward of the slip fit region;
a piston contained within the rear cavity and which the inactive state is restrained within the slip fit region by a shear disc positioned between the slip fit region and the press fit region;
a liquid reserve battery subassembly housed within the front cavity, said liquid reserve battery subassembly further comprising a battery housing and an electrolyte-filled glass ampoule contained within said battery housing;
and wherein in response to ballistic pressure, the piston translates forward in the rear cavity thereby rupturing the shear disc and breaking the electrolyte-filled glass ampoule to transition the pressure activated battery system to the activated state.