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BQ27510-G3 battery chemistry question

Junaid Alladin1
Prodigy 50 points
Other Parts Discussed in Thread: BQ27510-G2, BQ27510

Hi

Can someone please advise on the type of Li Ion battery chemistry required to use this charger.

I have an 1800mAH single cell LiCoO2 battery which I would like to use with this device, but i'm unsure if it will work correctly.

The datasheet does not specify an exact chemistry type, instead the description is "Battery Fuel Gauge for 1-Series Li-Ion Applications".

For example the BQ27410 datasheet specifies a battery chemistry of LiCoO2. Also other devices give you a choice between LiCoO2 and LiMn2O4 depending on the part number variant you select.

I haven't used this part before and i am using the Boostxl Battery Boosterpack Reference circuit as a guide, but they don't specify the exact battery chemistry used (they refer to the battery as lithium polymer).

Thanks

  • 0
    Genius 3970 points

    Glancing over the MSP430 version of the source code shows me that the bq27510-G2 is using either default parameters, or parameters that were pre-programmed onto the BoosterPack when the BP was manufactured; the code doesn't appear to have any means of modifying the gas gauge's configuration data. Because I don't have the actual BP to test, I can't say whether it's using default data or not. Either way, the default (typical LiCoO2) chemistry programmed into the device (assuming it's the default) should work well enough for you, since your battery's designed capacity matches the one specified for the BP.

  • 0 in reply to Jason Gin
    Prodigy 50 points

    Thank you Jason.

    It is weird that they don't specify the chemistry though, seeing as they do that in the other similar device data sheets.

    I suspect the I2C interface can be used to set up new chemistry profiles if needed. Perhaps i will look at similar device user guides to try and guess how this device is setup, if the default chemistry profile reports wrong state of charge values. I am hoping to be able to read out the CHEM ID parameter and confirm this once i get some hardware.

    Regards

    Junaid

  • 0 in reply to Junaid Alladin1
    Genius 3970 points

    The bq27410 (and the bq27421 and 425) make up TI's 'simpler' gas gauge lineup. These devices explicitly state their chemistry because they're hardcoded into the device and can't be customized.

    The bq27510 is one of TI's more advanced gauges and is a lot more flexible when it comes to customizing performance. The default chemistry is for a run-of-the-mill LiCoO2 cell but can be customized using certain commands.

    Typically, this is done using TI hardware and software that is attached to a PC when creating the chip's memory image, as the battery's chemistry data is more than just setting a chemistry ID; there is battery impedance data that also needs to be loaded.

    I might go and get one of the BoosterPacks to see for myself if the data on there is customized to the cell included in that kit. Is the 1800 mAh battery that you're mentioning the one that comes with the BoosterPack?

  • 0 in reply to Jason Gin
    Prodigy 50 points

    No its not the exact same one. I have a similar size (103450) made by http://www.celbattery.com/en/product.asp?ClassID=001 . It is a pretty standard LiCoO2 1800mAH cell.

    The battery which comes with the boosterpack must be reset if it over-discharged, whereas the one i have does not have this.