Telco-BIS-12V Battery Monitoring and Balancing System
“Telecom Battery Monitoring and Balancing System” designed to monitor the health of 48V lead acid (VRLA) battery groups used for energy backup in GSM base station sites and to eliminate voltage imbalances between four 12V VRLA batteries in 48V battery groups.
Telco BIS-12V consists of two types of modules. First module; It is positioned as 1 per “battery group” consisting of four 12V VRLA batteries. These modules, called "Battery Inspection Module - BIM", are fed from the 48V +/- ends of the related battery group. Battery pack voltage is also measured from the same ends. A cable connected to the "probe" connector on the front of the BIM is used to measure the voltages of four batteries in the battery group. 3 ends of the cable are connected to the + poles of the other batteries in the group. In this way, BIM can continuously monitor the voltages of 4 batteries in the group. The NTC type temperature meter on the same probe cable is placed between the two batteries in the middle of the battery group and the temperature at which the battery group is working can be measured by BIM.
In addition to the voltage and temperature of the battery group, the current flowing from the batteries in the direction of charge or discharge should also be known. With a current sensor connected to the current measurement connector on the back of the BİM, the current flowing from the battery pack is converted into a voltage signal and measured by BIM.
When an "imbalance" over a certain amount is measured between battery voltages during charging, BIM automatically begins the "active balancing" process between batteries. Energy is transferred from batteries with high voltages to batteries with low voltage, and the batteries are balanced at the same voltage level after a certain period of time.
Voltage, temperature and current information obtained from the batteries in the group are sent to the MPC module, which is a higher level processing unit by BIM. The MPC module periodically queries the data measured by BIMs connected to more than one battery group in the field and collects it in its own memory. The information covering all battery groups collected by MPC is analyzed by our embedded software algorithms on the MPC, and the health status of the batteries in the battery groups is determined one by one. Batteries whose health condition worsens or behaves abnormally so as to be called "bad" are determined. Warnings regarding batteries that are identified as defective are displayed to the maintenance technician via the LCD screen on the MPC.
There is an Ethernet TCP / IP interface on the MPC for sending data analyzed by the MPC to a central server. With this interface, the MPC transmits data to the "Remote Control-UZDEN" server in the operation center via the GSM operator's Intranet. When the information regarding the problematic batteries determined in the field reaches UZDEN, this information can be reported by UZDEN and sent to the relevant departments via e-mail or SMS.