.
BI51 Type User Manual V2.4
11
2.4 Technical feature
(1) SPI Daisy chain topology structure
BIU and BMU connected by Daisy chain topology. They can collect information of 16~48(BIU collection
16(or 32 or 48)*n
（
n=BMU number
）
cells.
(2) Single cell voltage collection
BIU and BMU collect single cell voltage through voltage collecting module
。
(3) Temperature collection
BIU and BMU collect each battery module temperature through NTC temperature modules.
(4)PACK total voltage detection
BIU can detect the total voltage of battery pack.
(5)CAN- bus communication
Each BMCU is equipped 3 ways of CAN-bus
CAN0: used for communicating with CSU and acquiring real-time total current
CAN1: used for communicating with charger.
CAN2: used for communicating with VCU/MCU, receiving order and status information from VCU/MCU.
(6)RS485 communication
External display shows SOC, voltage, current through RS485 communication. RS 485 communication can
also be used to update the program.
(7)SOC
，
SOH
、
SOP calculation
BIU calculates SOC,SOH and SOP on the basis of total current, total voltage, temperature and other
parameters.
(8) State of battery capacity
BIU calculates residual capacity, and shows it on LCD display/vehicle instrument/software.
(9) Driven relay/fan
BIU control the load power on/off through high side driven.
(10) Pre-charge module
When BIU control the load charging, it will pre-charge the main circuit load through pre-charge module
before charging the load.AUX+ could be used for controlling external pre-charge
(11)Onboard insulation monitoring
Monitor the insulation from high voltage positive and negative to vehicle case. Alarm when insulation
resistance under a threshold value.
(12)Input signal detection
BIU estimates vehicle operation state and charging state through detecting Key-On wake-up signal and
charger wake-up signal.
。
(13) Key information power-down saving
BMS will save the system key data (such as Max&Min voltage and the corresponding cells, SOC, current,
history error, etc ) when detecting the battery pack power-down.
2.5 Technological superiority
Summary of Contents for BI51
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