Digital correction algorithms to improve battery voltage measurement accuracy

A method, comprising:

• for a respective battery monitoring cycle, correcting a converted battery voltage value from an analog to digital converter (ADC) to provide a common mode corrected value based on a common mode voltage correction parameter and a common mode correction equation of a voltage reference circuit;
• for the respective battery monitoring cycle, correcting the common mode corrected value to provide a temperature corrected value based on a converted temperature value associated with a temperature sensor of the voltage reference circuit, temperature correction parameters, and a temperature correction equation;
• and
• for the respective battery monitoring cycle, correcting the temperature corrected value to provide a corrected battery voltage value based on a first converted strain value associated with a first strain sensor of the voltage reference circuit, a second converted strain value associated with a second strain sensor of the voltage reference circuit, strain correction parameters, and a strain correction equation.

A system, comprising:

• a battery;
• and
• a battery monitoring device, comprising:
• an analog to digital converter (ADC) having a signal input, a reference input, and an output;
• a multiplexer having signal inputs and a signal output, the signal output of the multiplexer coupled to the signal input of the ADC;
• a voltage reference circuit having an output, a first strain sensor, a second strain sensor, and a temperature sensor, the output of the voltage reference circuit coupled to the reference input of the ADC, the first strain sensor coupled to a first signal input of the multiplexer, the second strain sensor coupled to a second signal input of the multiplexer, the first and second strain sensors orthogonal to one another, and the temperature sensor coupled to a third signal input of the multiplexer;
• an analog circuit having an input and an output, the input of the analog circuit coupled to the battery, and the output of the analog circuit coupled to a fourth signal input of the multiplexer;
• and
• a digital circuit coupled to the output of the ADC, the digital circuit stores correction parameters for correcting a converted battery voltage value from the ADC, the correction parameters including common mode voltage correction parameters, temperature correction parameters, and strain correction parameters associated with the first and second strain sensors.