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bqEasy Batterie Learning cycle

Laura 56109
Prodigy 170 points

Hello everyone,

 

I am trying to to perform a batterie learning cycle for a batterie with unknown chemistry. I follow the steps in SLUA544 and discharge and charge the Batterie with the EV2300 and a Load (Figure 5). I dont really understand why do i need the EVM for?  Can i  charge and discarge the Batterie without the EVM? I can take the Charge current from any other source, right?

 

Thnks a lot

  • 0
    Prodigy 170 points

    I tryed to make the chemistry test without EVM. It doesn't work. The First error is "Cannot open the .encr file. The second one is "Could not find subclass and offset for Configuration.Registers.Op Config" and so on.

    why it doesn't work? Is it because the Chemistry Cycling is Step number 4 in bqEasy? So one should make Step 1 till 3 with I2C and then switch to HDQ for the chemistry cycling?

     

    Thanks again

  • 0 in reply to Laura 56109
    TI__Genius 14985 points

    Do you mean you have no gauge IC hooked up to the battery and to the PC?  bqEASY wants to communicate with the gauge on the EVM.  Also, the gauge needs to be monitoring the battery during the learning cycle. 

  • 0 in reply to dMax
    Prodigy 170 points

    This is why i was asking what is the function of  the EVM in the circuit. What happens exactly?

    The EV2300 is providing the Voltage for the switch, and this Voltage regulates the current in the Batterie. With this current the Batterie can be charged or maybe discharged? And the Information during this Process is saved in the Gauge IC. But then how it comes in the EV2300 back? Because it must be saved in Flash, no?

     

    Thanks,
    Laura

     

  • 0 in reply to Laura 56109
    Prodigy 110 points

    EV2300 reads the info from the gauge IC using command set from SBS specification and extended commands according to the documentation for the target gas gauge IC.

    Does it make sense?

     

  • 0 in reply to Dmitry Sorokin
    TI__Expert 3865 points

    In order to find a best match chemistry for your battery pack with unknown chemistry, we need to log the time, current, voltage, and temperature for the discharge cycle. The EVM is used because the device is reading all these data and bqEASY is recording them at run time. The chemistry matching will be preformed upon the end of the discharge cycle.

    When you use bqEASY for chemistry selection, you MUST go through the Configure tab and calibrate the device before starting the charge/discharge cycle. Otherwise, the software will not be able to match the data.

     

  • 0 in reply to Dmitry Sorokin
    Prodigy 170 points

    @Dmitry

    Yes, it makes sense. So during the discharge cycle there is no communication between the EV2300 and the Gas Gauge IC. After the discharge cycle completes i should readthe flash of the GG IC?

    Laura

  • 0 in reply to Laura 56109
    Prodigy 110 points

    @Laura

    I'm only awaiting my EV2300 to come, so sorry I can't answer questions specific to it.

    What I understand it can log working parameters in any working state of the gauge. Working with dataflash of the gauge is a separate task.