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BQ40Z80: bq40z80 for LTO batteries

user 1234
Prodigy 185 points
Part Number: BQ40Z80

We have to make a BMS for 5 series cells of LTO chemistry. Can we do below settings in bq40z80 :

1. Lower cut off required is: 1.8V/cell

2. Upper Cut off: 2.96V/cell

3. Continuous load: 25Amps 

4. Peak Load: 60Amps for 10msec

5. Continuous charge: 30Amps

6. balancing current: 1Amps  to be set by external mosfets

7. Battery capacity: 100Ah  (Can set value of resistor divider to 1/3, to accomdate this value in software)

Dear Aki,
 
We have to make a BMS for 5 series cells of LTO chemistry.
1. Lower cut off required is: 1.8V/cell
2. Upper Cut off: 2.96V/cell
3. Continuous load: 25Amps
4. Peak Load: 60Amps for 10msec
5. Continuous charge: 30Amps
6. balancing current: 1Amps
 
Do you have solution for this.
 
 
Thanks
Deepak Bansal
Pinaka Battery Solutions
+91-9215611008

  • 0
    TI__Expert 4645 points

    Hello, thanks for the inquiry.

    Yes, the bq40z80 appears to be suitable for your design.

    The CUV can be set to 1800 mV, and the COV can be set to 2960 mV.

    The loads and protections can be scaled as needed using the Scale Factor and individual settings.

    The external cell balancing can be configured for higher balancing currents than the internal cell balancing, and is shown in Section 8.2.