Determination of IR-free voltage in hybrid vehicle applications
First Claim
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1. A battery control module for use with a battery, comprising:
- a voltage measuring module that measures battery voltage;
a current measuring module that measures battery current; and
a state of charge (SOC) module that communicates with said current and voltage measuring modules, wherein said SOC module estimates an open circuit voltage based on said battery current and said battery voltage; and
wherein said SOC module estimates said open circuit voltage, when said battery is charging, based on an equation
V0=(V+vDschEvent−
(I+iDschEventheld)*R0)/2,where R0 is an internal impedance of the battery, V is the battery voltage, I is the battery current, vDschEvent is the battery voltage during a previous determination of the open circuit voltage when said battery is discharging, and iDschEventHeld is the battery current during the previous determination of the open circuit voltage, and wherein said SOC module estimates a SOC based on said open circuit voltage.
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Abstract
A battery control module is provided for use with a battery and includes a voltage measuring module that measures battery voltage, a current measuring module that measures battery current, and a state of charge (SOC) module that communicates with the current and voltage measuring modules. The SOC module estimates an open circuit voltage based on the battery current and the battery voltage and estimates a SOC based on the open circuit voltage.
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Citations
15 Claims
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1. A battery control module for use with a battery, comprising:
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a voltage measuring module that measures battery voltage; a current measuring module that measures battery current; and a state of charge (SOC) module that communicates with said current and voltage measuring modules, wherein said SOC module estimates an open circuit voltage based on said battery current and said battery voltage; and wherein said SOC module estimates said open circuit voltage, when said battery is charging, based on an equation
V0=(V+vDschEvent−
(I+iDschEventheld)*R0)/2,where R0 is an internal impedance of the battery, V is the battery voltage, I is the battery current, vDschEvent is the battery voltage during a previous determination of the open circuit voltage when said battery is discharging, and iDschEventHeld is the battery current during the previous determination of the open circuit voltage, and wherein said SOC module estimates a SOC based on said open circuit voltage.
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2. A battery control module for use with a battery, comprising:
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a voltage measuring module that measures battery voltage; a current measuring module that measures battery current; and a state of charge (SOC) module that communicates with said current and voltage measuring modules, wherein said SOC module estimates an open circuit voltage based on said battery current and said battery voltage; and wherein said SOC module estimates said open circuit voltage, when said battery is discharging, based on an equation
V0=(V+vChgEvent−
(I+iChgEventheld)*R0)/2,where R0 is an internal impedance of the battery, V is the battery voltage, I is the battery current, vChgEvent is the battery voltage during a previous determination of the open circuit voltage when said battery is charging, and iChgEventHeld is the battery current during the previous determination of the open circuit voltage, and wherein said SOC module estimates a SOC based on said open circuit voltage.
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3. A battery control module for use with a battery, comprising:
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a voltage measuring module that measures battery voltage; a current measuring module that measures battery current; and a state of charge (SOC) module that communicates with said current and voltage measuring modules, wherein said SOC module estimates an open circuit voltage based on said battery current and said battery voltage; and wherein said SOC module estimates a SOC based on said open circuit voltage and accumulates charge swing during charging and accumulates discharge swing during discharging; and wherein said SOC module determines whether said charge swing is greater than a negative of a retained discharge swing and determines whether said discharge swing is greater than a negative of a retained charge swing. - View Dependent Claims (4, 5, 6)
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7. A method of estimating a state-of-charge (SOC) of a battery, comprising:
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measuring a battery voltage; measuring a battery current; estimating an open circuit voltage of the battery based on said battery current and said battery voltage; determining said open circuit voltage, when said battery is charging, based on an equation
V=(V+vDschEvent−
(I+iDschEventheld)*R0)/2,where R0 is an internal impedance of the battery, V is the battery voltage, I is the battery current, vDschEvent is the battery voltage during a previous determination of the open circuit voltage when said battery is discharging, and iDschEventHeld is the battery current during the previous determination of the open circuit voltage; and estimating a SOC based on said open circuit voltage.
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8. A method of estimating a state-of-charge (SOC) of a battery, comprising:
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measuring a battery voltage; measuring a battery current; estimating an open circuit voltage of the battery based on said battery current and said battery voltage;
determining said open circuit voltage, when said battery is discharging, based on an equation
V0=(V+vChgEvent−
(I+iChgEventheld)*R0)/2,where R0 is an internal impedance of the battery, V is the battery voltage, I is the battery current, vChgEvent is the battery voltage during a previous determination of the open circuit voltage when said battery is charging, and iChgEventHeld is the battery current during the previous determination of the open circuit voltage; and estimating a SOC based on said open circuit voltage.
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9. A method of estimating a state-of-charge (SOC) of a battery, comprising:
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measuring a battery voltage; measuring a battery current; estimating an open circuit voltage of the battery based on said battery current and said battery voltage; accumulating charge swing during charging; accumulating discharge swing during discharging; determining whether said charge swing is greater than a negative of a retained discharge swing; determining whether said discharge swing is greater than a negative of a retained charge swing; and estimating a SOC based on said open circuit voltage. - View Dependent Claims (10)
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11. A battery control module for use with a battery, comprising:
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voltage measuring means for measuring battery voltage; current measuring means for measuring battery current; state of charge (SOC) determining means for communicating with said current and voltage measuring means, wherein said SOC determining means estimates an open circuit voltage based on said battery current and said battery voltage; and
accumulates charge swing during charging and accumulates discharge swing during discharging; andwherein said SOC determining means determines whether said charge swing is greater than a negative of a retained discharge swing and determines whether said discharge swing is greater than a negative of a retained charge swing; and
wherein said SOC determining means estimates a SOC based on said open circuit voltage. - View Dependent Claims (12, 13)
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14. A battery control module for use with a battery, comprising:
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voltage measuring means for measuring battery voltage; current measuring means for measuring battery current; and state of charge (SOC) determining means for communicating with said current and voltage measuring means, wherein said SOC determining means estimates an open circuit voltage, when said battery is charging, based on an equation
V0=(V+vDschEvent−
(I+iDschEventheld)*R0)/2,where R0 is an internal impedance of the battery, V is the battery voltage, I is the battery current, vDschEvent is the battery voltage during a previous determination of the open circuit voltage when said battery is discharging, and iDschEventHeld is the battery current during the previous determination of the open circuit voltage; and wherein said SOC determining means estimates a SOC based on said open circuit voltage.
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15. A battery control module for use with a battery, comprising:
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voltage measuring means for measuring battery voltage; current measuring means for measuring battery current; and state of charge (SOC) determining means for communicating with said current and voltage measuring means, wherein said SOC determining means estimates an open circuit voltage, when said battery is discharging, based on an equation
V0=(V+vChgEvent−
(I+iChgEventheld)*R0)/2,where R0 is an internal impedance of the battery, V is the battery voltage, I is the battery current, vChgEvent is the battery voltage during a previous determination of the open circuit voltage when said battery is charging, and iChgEventHeld is the battery current during the previous determination of the open circuit voltage; and wherein said SOC determining means estimates a SOC based on said open circuit voltage.
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Specification