Electricity: battery or capacitor charging or discharging – Battery or cell discharging – With charging
Patent
1998-04-30
1999-11-23
Tso, Edward H.
Electricity: battery or capacitor charging or discharging
Battery or cell discharging
With charging
H01M 1044, H01M 1046
Patent
active
059906618
ABSTRACT:
A circuit for heating energy storage devices such as batteries is provided. The circuit includes a pair of switches connected in a half-bridge configuration. Unidirectional current conduction devices are connected in parallel with each switch. A series resonant element for storing energy is connected from the energy storage device to the pair of switches. An energy storage device for intermediate storage of energy is connected in a loop with the series resonant element and one of the switches. The energy storage device which is being heated is connected in a loop with the series resonant element and the other switch. Energy from the heated energy storage device is transferred to the switched network and then recirculated back to the battery. The flow of energy through the battery causes internal power dissipation due to electrical to chemical conversion inefficiencies. The dissipated power causes the internal temperature of the battery to increase. Higher internal temperatures expand the cold temperature operating range and energy capacity utilization of the battery. As disclosed, either fixed frequency or variable frequency modulation schemes may be used to control the network.
REFERENCES:
patent: 3767995 (1973-10-01), Kaminski et al.
patent: 4209736 (1980-06-01), Reidenbach
patent: 5760488 (1998-06-01), Sonntag
patent: 5808469 (1998-09-01), Kopera
patent: 5824432 (1998-10-01), Currie
patent: 5831514 (1998-11-01), Hilpert et al.
Ashtiani Cyrus N.
Stuart Thomas A.
DaimlerChrysler Corporation
Stec Jennifer M.
Tso Edward H.
University of Toledo
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