Method and system for extending battery power at cell sites

摘要

The embodiments herein provide a method and system for extending battery power at cell sites. The method for extending battery power at cell sites comprises providing a combination of a valve-regulated lead-acid (VRLA) battery and a Li-ION battery, mixing cell chemistry of the VRLA battery and the Li-ION battery and charging the VRLA-Li-ION battery combination with a single charger circuit. The method further comprises providing a rectifier to both the VRLA battery and the Li-ION battery and activating each battery based on the available power. The Li-ION battery and the VRLA battery are the primary battery and secondary battery. The charging current through the VRLA battery is regulated by varying a pulse width of a high current switch based on the current read through the current sensor attached to a VRLA current path.

主权项

1. A method for extending battery power at cell sites, said method comprising a step of charging a VRLA-Li-ION battery combination with a single charger circuit, said step of charging the VRLA-Li-Ion battery combination comprising the following steps:
defining a pre-set current limit for the charger circuit; charging Li-Ion battery and VRLA battery with a float voltage; monitoring a charging current and a terminal voltage of the VRLA battery; determining a frequency and a duty cycle of one or more pulses for pulse charging of VRLA batteries; bringing the VRLA battery to an offline mode by determining a state of charge of the VRLA battery and making a pulse width to zero; discharging the Li-ION Battery at an initial stage; and using the VRLA battery to power the load as Li-Ion battery discharges to a pre-set charge limit.