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BQ24232H: Charging temperature

user6116982
Prodigy 10 points
Part Number: BQ24232H

Hi, there,

I have a question regarding the temperature of charging. 

According to IEC/EN 62368 (M.4） Li battery charging current shall not exceed its limit stated in battery spec. under different temperature. See below:

 Quite a lot batteries state that there charging current limit changes under different temperature. eg.

 

Yet BQ24232H only stop charging under 0 degree and over 50 degree. Why didn't TI set a default temperature for changing range at 0-45, instead of 0-50? Does TI think 50 degree charging is not an issue? And how TI solutions would support different charging current under different temperature? Assuming TI has provided solutions for customers with products following IEC62368, a little confusing if there wasn't any issue?

Thanks!

Sincerely,

Jinsong

  • 0
    TI__Mastermind 23170 points

    Hi Jinsong,

    Welcome to E2E!

    Be aware, the images you have provided did not upload correctly, for future reference, please upload with the "Insert/Edit Media" feature. 

    If a charger similar to the BQ2423xx device is desired that has an option to change it to 0 to 45C, the BQ2407xT family of devices can be configured for 0C to 45C using some external resistors. It uses a voltage based system for monitoring battery temperature instead of current. 

    To meet battery specs where charging current limits vary at different temperatures, you can refer to the NTC calculator tool found under some of our devices' product folders. 

    The below image is an example using an NTC's resistance values at 0 to 45C.