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Data Flash Setting for Bq34z100evm

Kinston Shih
Prodigy 110 points

Can I have another question for the data flash, there are some parameters.
1. Numbers of series cells
2. Design Energy
3. Design Capacity
4. Cell Charge Voltage Tx-Ty
The batteries I’m using are two YUASA NP12-12 (2S1P)

 I would like to know that
For ‘Number of series cells’ , Should I fill in 2?
For Cell charge voltage Tx-Ty, Should Ifill in 14.4V or 28.8V?
For Design Energy , Should I fill in 12000mah x 24V = 288000mW?
For Cell Terminate Voltage , Should I fill in 20400mV?(Cause one cell terminate voltage is 10.2V , I got 2S1P cells it will be 20.4V)

  • 0
    TI__Mastermind 34775 points

    Hi Kingston,

    See my response below:

    For ‘Number of series cells’ , Should I fill in 2? Yes, since your treating the two series batteries as two series 12V cells

    For Cell charge voltage Tx-Ty, Should Ifill in 14.4V or 28.8V? 14.4V, since your treating the two series batteries as two series 12V cells


    For Design Energy , Should I fill in 12000mah x 24V = 288000mW? Yes, 288000mWh


    For Cell Terminate Voltage , Should I fill in 20400mV?(Cause one cell terminate voltage is 10.2V , I got 2S1P cells it will be 20.4V) 10200mV, since your treating the two series batteries as two series 12V cells

  • 0 in reply to Damian Lewis
    TI__Mastermind 34775 points

    Hi Kingston,

    After further investigation the chemID is based on individual cells for Lead Acid, in the case of 24V you have 12 cells. You also need to be careful when connecting the batteries together. The series resistance of the connection can impact gauging accuracy.

    Number of series cells = 12 cells

    Cell charge voltage Tx-Ty = 2400mV

    Design Energy = 288000mWh

    Cell Terminate Voltage = 1700mV

  • 0 in reply to Damian Lewis
    Prodigy 110 points
    Hi Damian,

    Number of series cells = 12 cells (But I only have two cells)
    Cell charge voltage Tx-Ty = 2.4V (so is not 14.4V?)
    Design Energy = 288000mWh
    Cell Terminate Voltage = 1700mV (Is this parameter for Lion only?)

    Respectfully yours,
    Kinston Shih
  • 0 in reply to Kinston Shih
    TI__Mastermind 34775 points

    Hi Kingston,

    12V Lead Acid battery is made up of 6 cells.

    Number of series cells = 12 cells (But I only have two cells) [Damian] there's 6 cells per battery
    Cell charge voltage Tx-Ty = 2.4V (so is not 14.4V?) [Damian] 14.4V/6 = 2.4V
    Design Energy = 288000mWh
    Cell Terminate Voltage = 1700mV (Is this parameter for Lion only?) [Damian] 10.2V/6 = 1.7V

  • 0 in reply to Damian Lewis
    TI__Mastermind 34775 points

    Hi Kingston,

    The maximum Design Energy that can be entered is 32767mWh. Use the Design Scale and enter 28800cWh for Design Energy. Also Cell charge voltage Tx-Ty should be entered as 2400mV.

  • 0 in reply to Damian Lewis
    Prodigy 110 points

    Hi Damian,

    Can I know that why the cell charge voltage Tx-Ty is 2400mV?

    Respectfully yours,

    Kinston Shih

  • 0 in reply to Kinston Shih
    TI__Mastermind 34775 points

    Hi Kingston,

    Voltages are entered into the gauge in mV units. Your battery is charge voltage is 14.4V and there are 6 cells per battery, so the cell charge voltage is 14.4V/6=2.4V=>2400mV

  • 0 in reply to Damian Lewis
    Prodigy 110 points

    Hi Damian,

    The maximum Design Energy that can be entered is 32767mWh.
    You said that use the Design Scale and enter 28800cWh for Design Energy.
    My design energy is 288000mWh , so is the design scale  288000/28800=10? or 288000/32767=8.78?

    Respectfully yours,

    Kinston Shih

  • 0 in reply to Kinston Shih
    TI__Mastermind 34775 points

    Hi Kingston,

    I would recommend using design scale 10, so you have some headroom. You can use 8.78, but there's no headroom. Also be sure to update the following parameters in table 15 accordingly.

  • 0 in reply to Damian Lewis
    Prodigy 110 points
    Hi Damian,

    So is it mean that I should update all the following parameters since the design energy scale >1?
    And can I know the value that I should type in the following parameters?

    Respectfully yours,
    Kinston Shih
  • 0 in reply to Kinston Shih
    TI__Mastermind 34775 points

    Hello Kinston,

    These are all specific to your application, so I can't tell you what you should put for these parameters. These parameters defaults are 0, so you shouldn't have to do anything unless you change the defaults. If you change the defaults, just make sure the values you entered are scaled by design energy scale value.