Hello,
I would like to know how to test correctly the charging and discharging of a Li-Ion battery, we are checking the following:
Battery characteristics
Li-Ion
4S4P
14.6V Nominal voltage
12.8Ah
Charger configuration
VBAT = 16.4V
ICHARGE = 6A
IPRECHARGE = 0.3A
IDPM = 3A
CTTC = 0.1uF -> @9Hours
Fo =13.6KHz
Description Issue
The first charge begins with a battery voltage = 13.5V in fast mode charge with initial charge = 5.8A in CC mode and charge termination current = 290mA and it continues until the charge battery is completed.
After that, a load = 6A is applied for discharge until the battery voltage falls to 13.5V. At this point all appears working, but when we try to charge the battery again, the charge current = 40mA and doesn’t rise to the calibrate value, the led status shows that the charge is running but it doesn’t.
We changed the IC BQ24610RGER on the board and we got the same functionality, the first charge is completed and in the second charge the charge current keep the same value (40mA) for long time.
Could you suggest some test or advise to fix this issue.
Electrical values on board with charge current = 40mA
ISET1 = 1.221V
ISET2 = 0.299V
ACSET = 0.597V
TTC = 1.242V
TS = 1.695V
VREF = 3.304V
VFB = 1.823V
Charge state with charge current = 40mA
|
CHARGE STATE |
STAT1 |
STAT2 |
CHARGE ENABLE |
PG |
ACDRV |
BATDRV |
|
Charge in progress |
ON |
OFF |
ON |
ON |
ON |
OFF |
Thank You
