design custom bms for lithium battery

Main specs: - 7-16s automatically configure when installed series with BQ76952 chip. - 65x35mm size of pcb - roughly 100 individual components on pcb - BOM can't exceed $25, purchase of parts in amount of few hundreds pcs to build 100-200 boards at once. - bms data communication with Xiaomi/Ninebot family of scooters. As same as original bms from Xiaomi M365 battery. - settings or reading data via Android mobile apps such "m365Tools" or "PowerNine". (Google Play) - discharging 35A continuous, 60A peak, charging 6A - overload, shortcut and reverse polarity protection. - cca 50mA effective balancing current per bank - working with 3.6V Li-Ion and 3.2v LiFePO4 - 4 temperature measurement channels, 2x on pcb, 2x on cells - expected and guaranteed life of bms/components at least 2-3 years under standard working conditions. - full access to firmware settings and changes, create different versions (if necessary). Easy work with changes, adjustments etc. - photos of existed similar bms board.