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Goals
- Design a BMS that is robust to electrical noise found from sources in and out of vehicle
- The BMS is robust and reliable to vibration, elements, and users
- The BMS provides test points for scrutineering
- The BMS is calibrated appropriately
- Provides at least the minimal active protection requirements for the Li-ion battery pack
- Over-voltage
- Under-voltage
- Over-temperature
- Over-current (either direction)
- Transmit voltages, current, temperatures, and SOC to telemetry/display
- Consider manufacturability and flexibility
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| Question | Outcome |
|---|---|
| What are we using for the AFE? | LTC6811 LTC6804 - 12-cell AFE, add a ADG731BCPZ mux a mux to support up to 32 12 temp sensors? |
| Daisy chained or addressable? | Addressable - we'd like to put LTC3300 balancers on the same isoSPI lineDaisy-chained - addressable would require per-board configuration |
| What architecture are we using? | Single controller board, carrier board reads current and uses LTC6820 isoSPI interface, AFE boards contain AFE, balancers, and thermistor inputs Master battery box contains controller board, slave battery box is connected by isoSPI |
| Active vs. passive balancing | Passive balancing - See follow-up discussion in BMS Architecture Discussion for details |
| How many cells should we balance across? |
No longer relevant? |
| What current sensor are we using? | LEM bidirectional hall effect sensor (looking into DHAB or similar) |
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