Abstract: Techniques are described through which continuous gapless voltage measurements can be synchronized between devices with independent clock sources on an asynchronous bus by slightly adjusting a speed of a local clock source for a period of time. Also, a read-out technique is described through which the synchronous measurements can be read out in a coherent way. These techniques can allow a high-accuracy time-average of the battery cell voltage (or fuel cell voltage) to be reconstructed, while allowing the same results to be synchronous across an entire battery stack, for use in instantaneous voltage/current diagnostics or calculations.

Abstract: Voltage measurement techniques for battery cells in a battery management system (BMS) are described. Raw voltage measurements may include errors caused by ohmic losses due to cable impedances and other elements in the BMS. The techniques include performing a calibration cycle to generate correction values based on measured response with discharge switches in different states. The techniques also include scaling the correction values during runtime to correct for filter response errors in the voltage measurement.