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Title: Circulating current battery heater

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.
Authors:
 [1] ;  [2]
  1. (West Bloomfield, MI)
  2. (Toledo, OH)
Publication Date:
OSTI Identifier:
873850
Report Number(s):
US 6259229
DOE Contract Number:
AC36-83CH10093
Resource Type:
Patent
Research Org:
Midwest Research Institute
Country of Publication:
United States
Language:
English
Subject:
circulating; current; battery; heater; circuit; heating; energy; storage; devices; batteries; provided; circuit; pair; switches; connected; half-bridge; configuration; unidirectional; current; conduction; devices; connected; parallel; switch; series; resonant; element; storing; energy; connected; energy; storage; device; pair; switches; energy; storage; device; intermediate; storage; energy; connected; loop; series; resonant; element; switches; energy; storage; device; heated; connected; loop; series; resonant; element; switch; energy; heated; energy; storage; device; transferred; switched; network; recirculated; battery; flow; energy; battery; causes; internal; power; dissipation; due; electrical; chemical; conversion; inefficiencies; dissipated; power; causes; internal; temperature; battery; increase; internal; temperatures; expand; cold; temperature; operating; range; energy; capacity; utilization; battery; disclosed; fixed; frequency; variable; frequency; modulation; schemes; control; network; operating range; power dissipation; resonant element; resonant element; resonant element; variable frequency; storage device; storage device; storage device; storage device; storage device; energy storage; energy storage; energy storage; energy storage; energy storage; storage devices; frequency modulation; series resonant; series resonant; series resonant; switches connected; unidirectional current; cold temperature; fixed frequency; internal temperature; internal temperature; current conduction; chemical conversion; temperature operating /320/