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BQ2002D: Single Cell Configuration

K.Hamamoto
Guru 12155 points
Part Number: BQ2002D

Hi

We (out customer) are going to use this device with single cell configuration.

( I had already posted before)

https://e2e.ti.com/support/power_management/battery_management/f/179/p/668982/2496285#2496285

Then I have another question. At single cell configuration, BAT voltage is always below 2V. (the resistor is only RB1. RB2 is removed.)

1. So,I think the sequence flow is as below (blue and pink path?). However we are concerned the condition is always <2V so that the operation is looping as pink path.

Do you think the operation stop at "OFF state" even if the cell voltage is alwasy <2V.

2. Is there any recommended charge current at single cell configuration?

   Because if the charge current is small, we are concerned it is not able to detect correctly with small current. Should be ok if it is over 0.5C? 

 

Best Regards,

Koji Hamamoto

  • 0
    TI__Guru* 75786 points

    Hi Hamanoto-san

    The blue path will be normal charge proceeding to a charge complete and off.

    The pink path is if the cell voltage is above 2V and how it will exit this off state and enter a charge state.

    Recommendation on charge current----BQ2002D/T are looking for increase in cell temp to indicate charge complete, Delta T / Delta t.  If the charge current is reduced the increase in temp many not be clear and could be missed.  Consult the cell manufactures recommendation on min charging current and termination. 

  • 0 in reply to Bill Johns
    Guru 12155 points
    Hi Bill-san,

    I appreciate your prompt reply.

    >The pink path is if the cell voltage is above 2V and how it will exit this off state and enter a charge state.

    So that ,the pink path is not related in this case. Because the cell voltage never exceed 2V. Is my understanding correct?

    Regarding to the charge current , I understood. I suggest to out customer to ask the battery manufactures.

    Best Regards,
    Koji Hamamoto
  • 0 in reply to K.Hamamoto
    TI__Guru* 75786 points

    Hi Hamanoto-san

    So that ,the pink path is not related in this case. Because the cell voltage never exceed 2V. Is my understanding correct? ---Yes

    Regarding to the charge current , I understood. I suggest to out customer to ask the battery manufactures. --- Yes

  • 0 in reply to Bill Johns
    Guru 12155 points
    Hi Bill-san,

    I appreciate your prompt reply as always.
    I understood.

    Best Regards,
    Koji Hamamoto