BMS (Battery Management System), which is the battery management system, is the key link between the 'battery' and the whole vehicle of the electric vehicle. In general, the BMS consists of one main control unit and multiple slave units. The unit is directly connected to the battery pack (Battery Pack) to collect the voltage, current and temperature of the battery. The main control unit manages multiple slave units through CAN bus or Daisy Chain communication.
The NMS chip-based BMS power battery management system solution introduced by the company's main control unit uses the NXP SPC5774PF MCU. It is a Power Architecture-based, high-performance, high-security MCU with lock step core. SBC The system base chip NXP UJA1167TK offers a variety of configurable power options. The MCU can be used with the SBC system base chip to achieve a higher level of security. The analog front-end NXP MC33771 is responsible for battery data collection. One MC33771 can connect up to 14 cells. The MC33771 can be cascaded to form a daisy-wheeled communication. The BMS solution provided by the United Nations General Assembly is extremely flexible and can meet the needs of different customers.
Function description Monitor voltage and temperature of single battery; Monitor the whole series of voltage, current and temperature; 被动Passive equalization function between single cells; CANBattery pack adopts CAN bus or daisy wheel connection; There are a variety of protection and diagnostic features.
Key features: Single MC33771 can monitor 7 to 14 strings of batteries; Built-in passive equalization current switch tube, supporting up to 300 mA passive equalization current; Built-in coulomb counter for current detection; ASIL C chip functional safety level; Supports 15 MC33771 cascades; detection accuracy 2 mV; supports 43 internal self-test functions; 65 us synchronous measurement of voltage and current.