• State
  • Locked Locked
  • Replies 5 replies
  • Subscribers 64 subscribers
  • Views 246 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.

BQ51051B:Jeita profile problem with CE marking

Ömer Damla
Prodigy 30 points
Part Number: BQ51051B

Hello there,

It defines the temperatures at which the voltage of the battery should be 0-45 degrees Celsius for the li-po battery used in our products. This is how most li-ion and li-po batteries appear to be.

However, devices that have used the battery voltage (Texas Bq51051) support the Jeita standard. In this standard, the voltage of the battery is not cut off until 45 degrees Celsius, the charge reduces the voltage and voltage at degrees Celsius, and is cut off against voltage at 60 degrees Celsius.

However, when we want to get CE certification for our products, the jeita charging profile gives us trouble since the test center battery manufacturer gives the maximum charging temperature as 45 degrees Celsius.

We would like to know your thoughts on this grudge.

Best regards.

  • 0
    TI__Mastermind 23410 points

    Hi Omer,

    You can adjust HOT and COLD thresholds by adding some resistors and capacitors. Please take a look at the NTC calculator tool

    Best Regards,

    Anthony Pham

  • 0
    Prodigy 30 points

    Hello Anthony. First of all, thanks for the reply. We set the hot value as 45 degrees. So we changed some resistors. Bq is cut at 45 degrees. But then something crazy happened. The battery charging current was Ibulk when the temperature dropped below 15 degrees. When it went above 15 degrees, the current became Ibulk/2. And this situation continued until 45 degrees. When we charge it as Ibulk/2, our battery cannot go above 4.06V. We can't use almost 15 percent of our battery. We're making a mistake somewhere, but...

    In addition, we cannot run the ntc calculation program.
  • 0 in reply to Ömer Damla
    TI__Mastermind 23410 points

    Hi Omer,

    I will take a look at the NTC Calculator program. Can you share the schematic as well as the added resistors and capacitors that have been added to adjust for the 45C max charge temperature?

    Best Regards,

    Anthony Pham

  • 0 in reply to Anthony P Pham
    Prodigy 30 points

    Hi Anthony,

    First of all, I would like to point out that since our battery supports a maximum temperature of 45 degrees, the cut-off temperature is set at 42.5 degrees in this schematic.

    https://imgur.com/E1qbkLF

    Regards.

  • 0 in reply to Ömer Damla
    TI__Mastermind 23410 points

    Hi Omar,

    I appreciate the information. Would you be able to confirm what COLD or T1 threshold that was used to calculate, is it 0C? The potential issue is that over the range of 0 to 60, the effect of the NTC may be too small to register these lower thresholds and so the T3 Threshold may be impacting the T3 threshold and so this is why you see the reduced IBULK. The reduced voltage is the reduced charge voltage from T3 to T3 threshold.

    Best Regards,

    Anthony Pham