ELECTRIC VEHICLE BATTERY MONITORING SYSTEM
First Claim
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1. A battery powered apparatus comprising:
- a battery comprising one or more electrochemical cells, the battery having an output voltage and an output current when delivering power;
a load driven by power delivered from the battery;
a battery output voltage sensing circuit;
a battery output current sensing circuit; and
processing circuitry coupled to the battery output voltage sensing circuit and the battery output current sensing circuit, the processing circuitry configured to obtain sensed battery output voltage values and sensed battery output current values at defined intervals and to estimate values for at least three battery state parameters at particular times when the battery is delivering power to the load, wherein each of the at least three battery state parameters varies over time as the battery is used to drive the load;
wherein estimating the at least three battery state parameters comprises concurrently fitting sensed battery output voltage values and sensed battery output current values and/or data derived using the sensed battery output voltage values and sensed battery output current values to at least two different equations, wherein each of the at least two different equations are defined at least in part by different subsets of the at least three battery state parameters.
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Abstract
Systems and methods for monitoring and controlling a battery are disclosed. Systems can include a battery having an output voltage and an output current when delivering power, a load driven by power delivered from the battery, battery output voltage and current sensing circuits, and processing circuitry coupled to the battery output voltage and current sensing circuits. The processing circuitry may be configured to obtain sensed battery output voltage and current values, and to estimate values for at least three battery state parameters by concurrently fitting the voltage and current values to at least two different equations.
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Citations
26 Claims
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1. A battery powered apparatus comprising:
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a battery comprising one or more electrochemical cells, the battery having an output voltage and an output current when delivering power; a load driven by power delivered from the battery; a battery output voltage sensing circuit; a battery output current sensing circuit; and processing circuitry coupled to the battery output voltage sensing circuit and the battery output current sensing circuit, the processing circuitry configured to obtain sensed battery output voltage values and sensed battery output current values at defined intervals and to estimate values for at least three battery state parameters at particular times when the battery is delivering power to the load, wherein each of the at least three battery state parameters varies over time as the battery is used to drive the load; wherein estimating the at least three battery state parameters comprises concurrently fitting sensed battery output voltage values and sensed battery output current values and/or data derived using the sensed battery output voltage values and sensed battery output current values to at least two different equations, wherein each of the at least two different equations are defined at least in part by different subsets of the at least three battery state parameters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of operating a battery powered apparatus, the method comprising:
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driving a load of the apparatus with a battery; sensing the output voltage and output current of the battery at defined intervals while driving the load; using the sensed battery output voltage values and sensed battery output current values to estimate values for at least three battery state parameters at particular times when the battery is driving the load, wherein each of the at least three battery state parameters varies over time as the battery is used to drive the load, wherein the estimating the at least three battery state parameters comprises fitting sensed battery output voltage values and sensed battery output current values and/or data derived from the sensed battery output voltage values and sensed battery output current values to at least two different equations, wherein each of the at least two different equations are defined at least in part by different subsets of the at least three battery state parameters. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. An electric vehicle with a battery monitoring system, the vehicle comprising:
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a battery; a powertrain comprising at least one electric motor driven by the battery; a battery output voltage sensing circuit; a battery output current sensing circuit; and processing circuitry coupled to the battery output voltage sensing circuit and the battery output current sensing circuit, the processing circuitry configured to obtain sensed battery output voltage values and sensed battery output current values at defined intervals and to estimate values for at least three battery state parameters at particular times when the battery is delivering power to the powertrain, wherein each of the at least three battery state parameters varies over time as the battery is used to drive the powertrain, wherein estimating the at least three battery state parameters comprises concurrently fitting sensed battery output voltage values and sensed battery output current values and/or data derived from the sensed battery output voltage values and sensed battery output current values to at least two different equations, wherein each of the at least two different equations are defined at least in part by different subsets of the at least three battery state parameters. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification