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BQ40Z50-R2: battery risk management for fire protection

jason li
Prodigy 185 points
Part Number: BQ40Z50-R2

would like to know from battery smart power management perspective and the risk management.

1) how to prevent the lithium-ion battery fire due to overheating or overcharge 

2) how your redundancy schematic in case the malfunction from the controller

3) need your risk analysis on the risk mitigation on battery fire

  • 0
    TI__Mastermind 27321 points

    Hello Jason,

    1- Our BQ40z50-R2 device comes with integrated protections which will trigger under any overheating, overcharge, over-discharge. Please see Section 2 Protections in the TRM.

    2- I am not sure I am understanding. Please elaborate more.

    3- As mentioned above our devices offer integrated protections which will prevent the battery to be exposed to unsafe region of operations. We do not have risk analysis. It is the user responsibility to design safe Battery Management Systems. We can help with schematic or layout reviews and any questions you may have on a specific device.

    Regards,
    Jose Couso

  • 0 in reply to Jose Couso
    Prodigy 185 points

    jose, yes, i trust your protection algorithms for the battery protection in section 2 of bq40z50-R2 doc. 

    my question #2 is do you have redundancy algorithm for the critical protection in case of malfunction on a critical parameter in your bq40z50-R2?

  • 0 in reply to jason li
    TI__Mastermind 27321 points

    Hello Jason,

    We offer secondary protections if this what you are looking for. 

    In our Evaluation Board we use two BQ294532DRVR. It depends what features you are looking for the secondary protection. 

    Regards,
    Jose Couso

  • 0 in reply to Jose Couso
    Prodigy 185 points

    jose,  i would like to collect your feedback from your majority customer to justify if a secondary protection is necessary against battery fire protection.

    if your feedback from your medical device customer is overkill with the consideration of secondary protection, i will give up. 

    thanks

    jason 

  • 0 in reply to jason li
    TI__Mastermind 27321 points

    Hi Jason,

    BQ77216 — 3s to 16s: 

    • Voltage and temperature (NTC) based protection features, has two fault outputs which are typically used to drive a chemical FUSE.

    BQ77207 — 3s to 7s:

    • Voltage and temperature (NTC or PTC) based protection features, has two fault outputs which are typically used to drive a chemical FUSE.

    BQ77915 — 3s to 5s (More if stacked)
    Features: Cell balancing, FET drive, Open wire (OW), Over-temperature (OT), Overcurrent during charge (OCC), Overcurrent during discharge (OCD), Overvoltage, Short-circuit Discharge (SCD), Stackable, Under-temperature (UT), Undervoltage

    Regards,
    Jose Couso