Special considerations in Battery Management for Industrial Applications State of Charge, State of Power and State of Health

摘要

1. Industrial battery state of charge indication a. Chemical state of charge corresponds to low discharge rate b. Useable state of charge - reflects actual device performance at given rate, temperature, battery age 2. Battery State of health a. Cycle count and time alone are not sufficient due to differences in use conditions b. Both capacity and impedance change needs to be measured and taken into account c. Discharge rate of particular device determines relative effect of impedance and capacity d. State of health needs to be defined for a particular device discharge rate 3. Dynamic power management, State of Power a. Highly variable and spiky loads are typical in industrial applications, can result in early termination b. Dynamic power management can result in large increase of useful run-time c. Accurate Max Power reporting for given load pulse duration is possible using impedance spectra information that is updated for age and taking into account temperature 4. Remaining Energy (Wh) reporting and Constant Power modeling a. Most industrial devices operate in power control mode, so constant power model is more accurate b. Energy reporting allows to account for battery aging effect on device run-time 5. Need for high voltage battery gauge with support for up to 7 serial cells is addressed with bq40z80.