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Inquiry for BMS solution

Roy Teong
Prodigy 10 points
Other Parts Discussed in Thread: BQ76952

Currently my department are handling an ESS related project. We wish to build an ESS system, in which the battery used for this ESS project is a 16-series-cell connected battery module with a capacity of 20Ah. Each cell within these modules had operating voltage of 2.7V (minimum), 3.6V(nominal), and 4.2V (maximum). 

The system would be in 16s60p configuration, meaning that 60 units of the mentioned module will be connected in parallel. The battery system is expected to charge/discharge at 0.5C, which would be around a total of 600A from/to the inverters.
The mentioned ESS consists of 6 battery columns, each battery column consists of 5 battery racks and each rack is placed with 2 battery modules, all of these batteries are in parallel connection I repeat. 
As such, our site would like to seek your technical opinion on how to implement Texas Instrument's BCU/ battery monitoring module into our system. Aside from basic module-level-protection such voltage, current, SOC, and temperature protection, we would like to seek Texas Instrument's solutions on: 
1) What would be the solution to balance the charge/discharge current within the parallel batteries (battery clusters) using Texas Instrument's setup?
2) What would be the solution for monitoring and managing 60 units of parallel battery through Texas Instrument's setup?
  • +1
    TI__Mastermind 42060 points

    Hello Roy,

    The BQ76952 would probably be the best option for your application. This is a 16s battery monitor and protector which offers voltage, current, temperature and other types of protections. All settings are highly configurable, you can read its datasheet to get a feel on what it can do.

    Regarding your main questions. We currently do not have a solution for paralleling and managing these devices. Often a single monitor (like the BQ76952) is used to monitor parallel cells, but I understand that this may not be possible in systems like yours where you can different battery modules.

    It could be possible to use the BQ76952 in such configuration, but you would have to manage the connections between the packs externally somehow. You would have to be able to monitor each cell string voltage and make sure that the system does not connect two modules with a high difference in voltage (We do not want to have a forced charged/discharge between batteries). You may be able to manage the connection between the modules with ideal diodes or possibly with relays. 

    For example you could have a system where you have an external MCU/host that is able of communication with the bq76952/host battery module. Then your external host can control which relays to close or open based on the battery voltage of the inserted modules. Again this is just an idea, you may have to come up with your own system-level solutions for this. We are only able to suggest things to do as this is something we have not done directly.

    There are multiple ways this could be solved.

    Please do let me know if you have any other questions! Slight smile

    Best Regards,

    Luis Hernandez Salomon