Meaning
Algorithmic correction process that adjusts voltage and current measurement signals to remove errors caused by temperature changes in the sensing electronics. Applying thermal drift compensation ensures that battery diagnostic instruments remain accurate as the internal temperature of the tester fluctuates. It is a critical feature for high-power cycling tests where heat generation is significant.
Sensor Calibration
Multi-temperature testing of each sensing channel is performed during the manufacturing of the test equipment to build an error map. This map correlates the known temperature of the sensor with the measurement error, allowing the system to determine the exact correction required for any operating temperature. Regular calibration ensures the map remains accurate.
Software Execution
Microcontrollers embedded in the test equipment read the temperature of the shunt or Hall sensor and calculate the correction factor in real-time. This calculated factor is added to or subtracted from the raw measurement signal before the data is recorded. This process ensures that the reported current is stable, regardless of thermal changes in the instrument.
System Robustness
Implementing this adjustment process reduces the need for expensive climate control systems to keep the test environment at a constant temperature. It allows the testing equipment to operate reliably in harsh factory environments without losing precision. This capability lowers the overall operating cost and energy consumption of the battery manufacturing plant.
It also prevents the false safety alerts that occur when uncompensated sensor drift simulates a rapid voltage drop or a dangerous overcurrent condition.
