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Nowadays, to achieve better performance, some "smart device" needs an ultra accurate analog signal source to trim/calibrate its internal circuit during mass production which is very challenging for current ATE vendors. To design such a highly accurate signal source, it requires lots of engineering time especially in system architecture optimization, system noise estimation and performance...
Extended Kalman filter (EKF) is a typical method for state-of-charge (SOC) estimation of lithium batteries. An equivalent circuit model for the lithium battery is established, and model parameters are identified by experimental methods. Based on the battery model and model parameters, an EKF is proposed for SOC estimation. Analysis is conducted on the effect of the model coefficients of EKF to the...
Inconsistency is common in lithium-ion battery packs and it results in voltage differences. Data from a battery pack with 200 cells connected in serial in a battery energy storage system (BESS) are applied for study. According to the causes of the voltage difference, three cell inconsistencies can be categorized as state-of-charge (SOC), internal resistance and capacity. The divergences among the...
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