Abstract: Example embodiments of the described technology provide an apparatus for testing an electrochemical system. The apparatus may comprise a testing module electrically coupled to the electrochemical system. The testing module may comprise a discharge circuit configured to draw current from the electrochemical system at a plurality of different rates. The discharge circuit may be configured to continuously draw current from the electrochemical system once a test of the electrochemical system is commenced. The apparatus may also comprise a measurement module which may be configured to measure voltage across terminals of the electrochemical system and current drawn from the electrochemical system during the test. The apparatus may also comprise a processor. The processor may be configured to compensate at least in part the measured voltage for voltage drift which was generated by continuously drawing current from the electrochemical system.

Abstract: A rechargeable battery is charged and, at the same time, steps are taken to assess its state of health (SoH). The SoH is first broadly classified, which is only a coarse estimate. Next, the state of charge (SoC) is estimated, and then the SoC is repeatedly measured and predicted during charging until its value converges to a reliable value. The SoH is a state in the Kalman filter used for determining the SoC, and the SoH is also refined through the filter process. The SoH is reported when or after the SoC has converged, and is reported before charging is completed.

Abstract: A rechargeable battery is charged and, at the same time, steps are taken to assess its state of health (SoH). The SoH is first broadly classified, which is only a coarse estimate. Next, the state of charge (SoC) is estimated, and then the SoC is repeatedly measured and predicted during charging until its value converges to a reliable value. The SoH is a state in the Kalman filter used for determining the SoC, and the SoH is also refined through the filter process. The SoH is reported when or after the SoC has converged, and is reported before charging is completed.

Abstract: A rechargeable battery is charged and at the same time, steps are taken to assess its state of health. The state of charge is first estimated, then repeatedly measured and predicted during charging until its value converges to a reliable value. A further known state of charge is later determined, during or after the remainder of the charging. Using the two states of charge and the amount of charge supplied to the battery, the state of health is calculated based on the rated capacity of the battery.

Abstract: A battery is subjected to a discharge current pulse that is normalized to its capacity. The battery voltage is measured before, during and after the pulse, and various parameters are calculated therefrom. The parameters are adjusted depending on both the value of the nominal or maximum cut-off voltage of the battery and on its open circuit voltage prior to the pulse. Based on the open circuit voltage, one of multiple different analysis paths is selected, each representing a different state of charge range. The analysis selected involves a comparison of the adjusted parameters with a set of thresholds that are specific to the selected analysis and that depend on the desired cut-off point between good and poor state of health. Batteries of different nominal voltages, capacities and chemistries can be tested without knowing their state of charge and without the tester having been calibrated for a specific battery model.