Battery Management System（BMS）for HEV

　　1，Product Description

　　The BMS is mainly used for the power battery system of the HEV,The BMS can detect the power batterys on line and monitor the battery in real time to provide the voltage,current,temperature,SOC,state of insulation and other information,and meanwhile judge the operating state of the battery and discreteness of battery pack in real time.If there is a failure,the battery management system sends the failure signal to the ECU or anyother unit on the CAN bus of the electric vehicles,even in some worst state ,shuttdown the output ofthe power battery system.

　　2,BATTERY MANGEMENT SYSTEM FUNCTIONS:

　　Single Cell Voltage Measurement;

　　Cell in Series Temperature Measurement;

　　Cell in Series Current Measurement;

　　Cell in Series Insulation Resistance Detection;

　　Cooling Fan Control;

　　Cell SOC Estimation;

　　Cell Balancing Control;

　　Power Control of Discharge and Charge;

　　The Estimation of Remaining Energy for Last Mileage, Power Consumption per 100 km Estimation, Total Mileage Accumulation (Based on The Data of Accurate Application and Real-time Mileage in CAN Stander ,Which Should Be Provided by The Buyers, Directly or Indirectly)

　　Bad Cell Analysis and Online Alarm;

　　The Case of Discrete Evaluation of The Battery;

　　Communications with Vehicle Equipment, Provide the Necessary Data for Vehicle Control by CAN1;

　　Communications with Vehicle Equipment, Provide the Necessary Data for Vehicle Control by CAN2

　　Communication with The Charger, Make Sure Charging Cafely by CAN2;

　　3,TECHNICAL PARAMETERS OF THE MASTER UNIT:

　　Current measurement accuracy: ≤ 1% (-300A-300A)

　　SOC measurement accuracy:≤ 8% (pure electric operating conditions)

　　Operating temperature: - 25-65 ℃

　　Operating Voltage: (15V - 25V)/DC

　　System Clock: provide time for systems to recording data in real-time

　　Insulation Detection: detect the insulation resistance between vehicle chassis and battery, and in accordance with the national electric vehicles insulation standards :GS / T 18384.1 ~ 18384. 3-2001, related to grading, classification code.(standards and recommended participation in the following table):

　　Current SOC: gain the current sampling by Current Sensor (300A/75mV) to complete the current measurement and AH accumulated.

　　CAN1: used for communication between the vehicle controller and sent the important parameters of batteries to the integrated controller to optimize driving.

　　CAN2: used to send the single cell voltage and temperature data to the combination of instrument display and charger.

　　CAN0: used to internal communication between the master control unit and control unit

　　RS-232: connect PC and handheld for monitoring and data downloading for user

　　4,TECHNICAL PARAMETERS OF THE SLAVER UNIT:

　　Operating Temperature Range: - 25-65 ℃

　　Voltage Max Measurement Error: ≤ ± 15mV (2V-5V)

　　Temperature Max Measurement Error: ≤ ± 1 ℃ (-40 - 125 ℃)

　　Power conversion:15-25V/DC to 5V/DC

　　Temperature detection:The Battery Management System can check the temperature sensor, and check the temperature sensor being lost or not; at the same time, the temperature sensor can work well or not, All the Temperature sensor be marked in n Each battery box will be installed some temperature sensors, 4 for small box and 6 for large box.

　　Voltage Measurement: Measurement up to 12 cells in series per part in one unit, we can select how many cells as we need, 60 cells at most per slaver unit;

　　CAN0: the communication interface between master control unit and the slaver control unit.

　　Fan Control:Start fan in several states: Fan power: <25W (or 1A).

　　High temperature

　　Temperature Sensor Failure

　　5.1 BATTERY MANAGEMENT SYSTEM PARAMETER SETTING

　　5.1 Setting master control unit parameters (according to different protocols to determine parameters)

　　1, set the imbalance threshold: threshold temperature: 5 ℃

　　Voltage threshold: 0. 4V

　　2, set the threshold of a serious fault:

　　The battery temperature threshold: 55 ℃

　　Threshold voltage limit: 3.9V

　　Lower threshold voltage: 2.0V

　　3, set the maximum voltage (charge): voltage threshold:

　　4, set unmatch parameters: threshold voltage: 1.8V

　　5, set the total voltage threshold:

　　Upper limit threshold voltage: 65