• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 718 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ 2060 power spike and shut down

Piotr Kowalczyk
Prodigy 160 points
Other Parts Discussed in Thread: BQ2060

I have problem after connecting device ,device is working at low current consumption ( up to 1000mA )  when it only use bit more mA even for about a sec it shutting it self down ,battery indicator is showing full capacity and voltage is as well i operating range i can switch on and it's working again  with no problem and this occurs  all the time( power spike and shut down), I'm using EV2200-60module i have used in table fixed EDV and I'm not quite sure if they are correct maybe i should use compensated EDV but i requested from cells manufacturer data sheet from cells and no response from his site so i do not know specification of cells only capacity of one cell is 1600mAh and voltage 2.75 empty and 4.2 full thats what claims seller .

 

I do not know what this could cause I'm posting  screen shots from EEprom and bq2060 Data battery pack is 2x2 cells 18500 with voltage 7.4V and total capacity of 3600mAh

 

 

 

 

 

  • 0
    TI__Intellectual 940 points

    Hello Piotr,

    I cannot understand the issue.

    What does "shutting it self down" mean?  Does this mean that communication does not work or that the gauge reports 0 capacity?  ;Do you have a lithium-ion safety circuit that is opening and the battery voltage drops to zero?  If the protector is opening, this is not a problem with the bq2060, but has to do with the lithium-ion protector overcurrent trip threshold.

    What do you mean by "switch on"?  Does this mean application of a charger, or disconnecting and reconnecting the battery to the gauge?

    Is the bq2060 powered continuously during your testing?  It is designed to be installed within a battery pack and continuously powered.  A completed battery lithium-ion battery pack will include the required protector circuit that will open under overload, overvoltage, and undervoltage conditions.

    Bill

  • 0 in reply to Bill J10799
    Prodigy 160 points

    Yes it is supply all the time and it is showing full capacity , communication is as well ok and by "shutting it self down " i meant it is actually shutting it self down device supply from bq2200-60 unit it shutting it self down,it looks like would be power cut ,sudden and unexpected power cut i can switch back on device by (on switch, everything is all the time connected , battery power supply and unit is showing full capacity as well all led's are on which indicate full capacity state ) and it is fully working i quite not understood this behaviour as well i did measurements with  two multimeter's and Voltage is constant  the only thing what is happening is that when i try to draw more then 5- 6Watt of power, device ( not 2200-60 )is shutting it self down and i need 7-9Watt   1400-1800mA , and only thing on the way from battery to device is sense resistor ,no safety circuit or anything ,just straight forward connection basicly it is not over load it is normal power requirements from my device i need only that my device will know how much capacity is left in battery pack and voltage , i try with connecting simple bulb on the end of circuit which is taking about 1500mA and it works perfectly 2200-60 battery gauge is showing current drop that is matching to my measurement with multimeter as well as voltage is correct .

     

  • 0
    TI__Intellectual 940 points

    Hello Piotr,

    The english translation program does not explain where power is cut.  The bq2060EVM has no means to cut power, so loss of power to your load must be due to something in the battery pack or something in the load.  I am not understanding any issue with the bq2060EVM as it was described to me.  It is possible there is PTC (overcurrent switch element) mounted in battery pack.  If this opens at heavy load, battery pack output voltage will drop and this can be verified with meter.  If voltage to load is still present, but load stops functioning, then loss of power must be internal to the load.  The bq2060EVM only has a small resistor (30mohms) between BAT- and PACK- connection, so unless resistor opens, there is no way that power to the load should be cut by the bq2060EVM.  The BAT+ and PACK+ connections at the EVM are tied together, so power cannot be cut in positive lead by the EVM.

    You may want to send drawing of your test setup, showing where power is present and where power is cut after applying a heavy load.  Perhaps this drawing will help me understand your issue.  It does not sound like there is any issue with the bq2060EVM with the problem description that was posted.

    Bill