Battery sensing circuit path resistance compensation systems and methods
AssigneeGM Global Technology Operations LLC
InventorsAndrew K. Chandler, Roger M. Brisbane, Paul W. Kelley
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Abstract
System and methods for measuring parameters of a battery system using a battery sensing circuit are presented. In certain embodiments, the systems and methods allow a vehicle battery sensing circuit and/or other associated system to measure a compensation parameter. The compensation parameter may be utilized by the battery sensing circuit and/or other associated system in measuring other parameters relating to the battery system including cell voltages.
Claims19
A method for measuring an actual voltage of a first cell included in a battery stack, the method comprising:
- measuring a first voltage of the first cell with a first balancing switch associated with the first cell turned off and a second balancing switch associated with a second cell included in the battery stack turned off;
- measuring a second voltage of the first cell with the first and second balancing switches turned on;
- determining a compensation parameter based on the measured first and second voltages;
- and
- determining the actual voltage of the first cell based on the compensation parameter and at least one of the first and second voltages.
A system comprising:
- a battery stack comprising a first cell;
- a first balancing switch coupled to the first cell;
- and
- a battery sensing circuit coupled to the first cell by a first sense path;
- wherein the battery sensing circuit is configured to:
- measure a first voltage of the first cell with the first balancing switch and a second balancing switch associated with a second cell included in the battery stack turned off;
- measure a second voltage of the first cell with the first and second balancing switches turned on;
- determine a compensation parameter based on the measured first and second voltages;
- and
- determine the actual voltage of the first cell based on the compensation parameter and at least one of the first and second voltages.
A non-transitory computer readable storage medium storing instructions that, when executed by a processor, cause the processor to perform a method comprising:
- receiving a first voltage measurement of a first cell included in a battery stack with a first balancing switch associated with the first cell turned off and a second balancing switch associated with a second cell included in the battery stack turned off;
- receiving a second voltage measurement of the first cell with the first and second balancing switches turned on;
- determining a compensation parameter based on the first and second voltage measurements;
- and
- determining the actual voltage of the first cell based on the compensation parameter and at least one of the first and second voltage measurements.
Dependencies are inferred from the claim text.