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U.S. Department of Energy
Office of Scientific and Technical Information

Bipolar battery plate

Patent ·
OSTI ID:5690727
A liquid-impermeable plate having throughplate conductivity with essentially zero resistance comprises an insulator sheet having a series of spaced perforations each of which contains a metal element sealingly received into the perforation. A low-cost plate can readily be manufactured by punching a thermoplastic sheet such as polypropylene with a punching tool, filling the apertures with lead spheres having a diameter smaller than the holes but larger than the thickness of the sheet, sweeping excess spheres off the sheet with a doctor blade and then pressing a heated platen onto the sheet to swage the spheres into a cylindrical shape and melt the surrounding resin to form a liquid-impermeable collar sealing the metal into the sheet.
Assignee:
California Institute of Technology
Patent Number(s):
US 4542082
OSTI ID:
5690727
Country of Publication:
United States
Language:
English