Circulating current battery heater

Patent · Mon Jan 01 00:00:00 EST 2001

OSTI ID:873850

Ashtiani, Cyrus N ^[1]; Stuart, Thomas A ^[2]

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1. West Bloomfield, MI
2. Toledo, OH

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.

• Research Organization: Midwest Research Institute, Kansas City, MO (United States)
• DOE Contract Number: AC36-83CH10093
• Assignee: DaimlerChrysler Corporation (Auburn Hills, MI); University of Toledo (Toledo, OH)
• Patent Number(s): US 6259229
• OSTI ID: 873850
• Country of Publication: United States
• Language: English

Related Subjects

circulating
current
battery
heater
circuit
heating
energy
storage
devices
batteries
provided
pair
switches
connected
half-bridge
configuration
unidirectional
conduction
parallel
switch
series
resonant
element
storing
device
intermediate
loop
heated
transferred
switched
network
recirculated
flow
causes
internal
power
dissipation
due
electrical
chemical
conversion
inefficiencies
dissipated
temperature
increase
temperatures
expand
cold
operating
range
capacity
utilization
disclosed
fixed
frequency
variable
modulation
schemes
control
operating range
power dissipation
resonant element
variable frequency
storage device
energy storage
storage devices
frequency modulation
series resonant
switches connected
unidirectional current
cold temperature
fixed frequency
internal temperature
current conduction
chemical conversion
temperature operating
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