TIDA-00792: 60V 12-15Ah 15 cell design - TI E2E - Texas Instruments

Hi Aidan,
1. Yes the design can be used for 14S or 15S. Be aware of the voltage and any safety limits for your facility or equipment.
2. Yes, you can choose to use your cells over any range in their allowed operation. Li ion cells doe not have memory like some other chemistries. An added note, the bq-R1 will estimate capacity on reset based on the voltage of the cell and its stored chemistry selection.  If you are using the cell over a reduced range the capacity estimate may be poor at reset.  In operation it will learn the capacity.  It will learn best if it sees the knee of the discharge curve.

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2.5 High temperature is generally the concern for li-ion cells, so thermistors should generally be placed on the hot points in the battery assembly. You may need a thermal analysis or testing to determine this point. The thermistors should be in contact with the cells to determine cell temperature.
3. Paralleling cells is common to achieve higher capacity. Be sure to match the cell voltages before connecting in parallel.
4. If the charger is connected simultaneously with the load it may supply current to the load as well as to the battery. If the load requires more current than the charger can supply current will flow from the battery. Generally the battery will not care. The charger circuit should also respond to the load appropriately, check with your charger supplier if in doubt. The bq-R1 has body diode protection so the protected FET will turn on again if current flow continues at a protection. For example if the load pulls the charger and battery into UV, DSG turns off, the load may shutdown from low voltage. Since the charger is delivering current to the battery it raises the voltage, current into the battery turns on the discharge FET. When the system sees the voltage and comes out of reset it may re-apply the heavy load and cause a cycling behavior. Many designers will use operational mode control in their system to avoid this condition. It sounds like you will cut off your system operation before UV of the cells.
5. The charge algorithm in the bq-R1 is the reporting of charging voltage and current, and the signaling of full charge. The actual profile of the charge into the battery would be determined by the charger. For example if you program the bq-R1 that the fast charge current is 4A, it will report 4A to the charger. If the charger can only provide 2A or has some other instruction to provide 2A it would do so. The bq-R1 does not have an input for system mode to adjust the reported current.
I don't support chargers but understand many high voltage chargers are MCU controlled supplies, so if the MCU knows the system state it could provide an appropriate profile. Generally it would seem if your system operates at 2A and the charger could provide 4A, the battery would charge at the difference or 2A when the system is operating. When the system was off the full charger current could be available to the battery.

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