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Lithium battery charging with BQ25051B

Vignesh Rao
Prodigy 250 points
Other Parts Discussed in Thread: BQ51051B, BQ51050B

Hi,

We are using BQ51051B wireless power receiver and battery charger in one of our projects. Our device is powered by lithium-polymer battery(MIKROE-1120) and for charging the same, we use BQ51051B which has an Vbat(reg) of 4.35V

The charging voltage of battery is 4.2V whereas the charger will feed 4.35V as wrong part has been chosen(instead of BQ51050B), used in our device. Kindly help me understand in what way the charging voltage mismatch will affect my battery and device.

  • 0
    TI__Genius 13700 points

    Hello Vignesh,

    The result could be something as benign as reduced number of battery cycles but a slight increase in capacity from chagrin the battery to a higher voltage to the more drastic case of overvolting the battery causing internal heating to instigate thermal runaway.

    Looking at the battery datasheet particularly Pg. 9 where is discusses the overvotlage protection integrated into the pack there is a chance that it might not charge at 4.35V if the threshold is below that point otherwise you will most likely see the more innocuous first case of a reduction in the number of usable cycles that will results from charging your battery to a higher voltage. This is further suggested by the last entry in the table on Pg. 12 of the battery datasheet for the "abnormal charge test"

    So while there may not be any immediate problems for this application. I would strongly encourage you to move to comply with the battery charging voltage spec of 4.2V

    You might also want to adjust your post title to properly reflect the devices your are looking at.