How is the battery charging technology 3 stage ?(23/11/2015)
The commonly used types of lead battery charging steady flow method ( CC ) and voltage regulator ( CV ) , charging time can last from 12-16 hours or even longer than 36-48 hours. with the use of multi-stage charging technology (multi – stage ) charging time can drop to 8-12 hours . Charging technology is currently the most popular 3- stage charging technology include stable phase line charging , charging phase voltage regulator , and phase floating charge (float charge).
Stage 1: The battery will be charged with constant current to ensure batteries are charged quickly in a short time .Stage 2 : the battery reaches a certain voltage charger will switch to this stage and to maintain a constant voltage in a certain period , the line charging will be reduced to ensure acuy loaded .
Stage 3 : after a while batteries charged at steady state voltage charger will switch to float charge phase (float charge ) at this stage with a line of very small charge to cover part due to battery self-discharge capacity . In stage battery charging steady flow will reach approximately 70% of capacity after 5-8 hours. 30 % will be charged for the period of time for charging the voltage regulator for this period usually lasts 7-10 hours. This stage is extremely important to the battery and it is such as ” the rest after every meal ” . If you skip this stage battery may not be charged enough . final stage float charger used to maintain battery capacity consistently achieved full status . The illustration below describes the process of charging 3 stage
The transition from phase 1 to phase 2 takes place when the battery voltage reaches a threshold . Field charging start descending , go on stage osmosis , battery threshold is reached when the current full charge around 3-5 % average capacity ( Ah ) . Voltage limit for charging voltage regulator stage typically about 2.30V – 2.45V per cell ( eg 6 cell battery is 12V voltage in this period is about 13.8V – 14.7V)
The selected voltage limit should refer to the manufacturer’s datasheet to give exact figures because if too low voltage installations will not be fully charged battery that , even if the voltage is too high is not good for the battery . Temperature coefficient of lead batteries line around -3mV / ° C , taking the mid-point of 25 ° C , so charging voltage per cell with 3mV reduce each magnitude than 25 ° C , and vice versa for each degree increase 3mV less than 25 ° C . The table below shows some of the advantages and disadvantages corresponding to the threshold voltage applied to each cell charger.