Analog Front End (AFE)
Jarod Krane
To develop a BMS that can monitor and passively balance lithium ion cells.
The BMS is the heart of an electric vehicle, and is critical to the safety of the driver when using a lithium ion battery pack.
- High level system block diagram of BMS AFE boards (connections with each other, with battery pack, and with BMS master)
- BOM for all components needed to use BQ76PL455A IC
- Schematic for balancing/sensing section of AFE
- Schematic for IC peripherals (decoupling capacitors, power transistors…)
- Schematic for connections to battery cells
- Schematic for UART connection to BMS master
- Schematic for isolated differential communication to other AFEs
- PCB for entire AFE (2 layers within 100mmx100mm)
- Documentation on functionality and features
- This is a High Voltage PCB, a document must be created with screenshots demonstrating all the HV isolation rules followed
- Depopulate R10, R11, R20, R30
- Populate R10, R11, R20, R30 (connecting RX, TX, VP, to VIO and wakeup to ground)
- Depopulate J1
- For unused cells on the final daisy chained board depopulate all components of the Vsense_EQ schematic of the corresponding unused cells. Short across all zener diode pads from top line to the highest used cell
