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[原创] NXP NTBMS电池管理系统安全参考设计

关键词:汽车电子 电池管理系统 智能电网

时间:2019-09-05 10:54:07       来源:中电网

nxp公司的NTBMS电池管理系统,适用于汽车电池管理系统,用作锂电池的起动电池或辅助电池. NTBMS平台设计具有高度可靠性和安全性,和ISO 26262 ASIL C兼容.锂电池管理系统包括电池监测,电流测量,无源电池平衡,电池断路器控制,电池参数提取(充电状态,健康状态)的计算单元以及通过CAN和其它ECU通信.平台集成了高达ASIL C的系统诊断,过流保护,过充电保护,超温保护,过压保护,欠压保护(短路),非预期继电器关闭保护,非预期继电器开路保护和碰撞检测输入.主要用在汽车BMS锂电池起动电池,汽车辅助电池BMS,智能电网以及其它电池管理系统(医疗,电动自行车,轻型运输和工业).本文介绍了NTBMS主要特性,技术数据,框图和系统框图,系统连接框图与电路图.

NTBMS is a Battery Management System for manufacturer ofautomotive Battery Systems, used as Starter Battery or AuxiliaryBattery with Li-Ion cells.

The NTBMS platform is designed for systems with high demandon reliability and safety in compliance with ISO 26262 ASIL C.

NTBMS is a generic safety reference design for BMS developedin cooperation with NXP. The Battery Management System of Li-Ion battery includes cell monitoring, current sensing, passive cellbalancing, battery breaker control, computation unit for Batteryparameter extraction (such as State of Charge, State of Health)and communication to other ECU through CAN.

Battery management systems (BMS) are responsible to steerand control high-voltage batteries of Electric and Hybrid ElectricVehicles. This control unit is essential since several battery cellsare unified to a cluster to enhance battery capacity. It is a chargeregulator which should guarantee a stringent power supply ofthe engine.

BMS are essential to monitor state of charge, load distribution,temperature of each battery cell as well as of the whole batterypackage and development of the charging capacity.

NTBMS主要特性:

_ Integrated system diagnostic functions up to ASIL C
_ Overcurrent protection
_ Overcharge protection
_ Over-temperature protection
_ Over-voltage protection
_ Under-voltage protection (short circuit)
_ Protection against unintended relay close
_ Protection against unintended relay open
_ Crash detection input

NTBMS用户优势:

_ Accelerate time to market
_ Reduction in costs for development and certification
_ Safety Development Platform for BMS
_ Reference Design in compliance to ISO 26262 ASIL C

NTBMS典型应用:

_ Automotive BMS for Starter Battery with Li-Ion battery
_ Automotive BMS for Auxiliary Battery
_ Smart Grids
_ Other Battery Management opportunities (medical, e-Bike,light transportation, industrial)


图1.NTBMS基板和NT SafeSOMmicro外形图

NTBMS基板主要技术数据:

电源

The device is designed for operation with 12V to 18V DC powerSupply. Operation with other supply voltages is not permitted.The supply voltage is connected via the connection cable providedfor this purpose.

环境条件
温度


The device is designed for storage and operations at the followingtemperature ranges:
_ Storage temperature: -15℃ to +70℃
_ Operating temperature: 0℃ to +40℃

电池特性
电流载流能力

_ 250 A permanent;
_ 600 A for 40 s;
_ 1400 A for 1 s

电池管理系统电流

_ operating current < 25 mA@RT

其它特性

_ Intrusive diagnostics (performed by MCU)
_ Memory storage (RAM& flash)
_ Power management (low power and normal mode)
_ LIN for starter batteries
_ CAN for the auxiliary batteries.

图2.NTBMS系统框图

The application is a Battery Management System (BMS) evaluation platform for a 14V Li-Ion battery (including cell monitoring, current sensing, passive cell balancing, battery breaker control, computation unit for Battery parameter extraction and communication to other ECU through CAN.

The NT BMS consists of a general purpose Safety System on Module (NT SafeSOMmicro) which is an ASIL C ready microcontroller platform, including two microcontrollers which are supervising each other and an ASIL D qualified System Basis Chip providing all necessary voltages, CAN PHY and Watchdog functionality.

Second part is the NT BMS Baseboard where all battery management specific components are located. The three main components are:

 Battery Cell Controller
 Current measurement shunt resistor
 Breaker control circuit

图3.NTBMS框图

图4.NTBMS系统连接框图

图5.NTBMS电路图(1)

图6.NTBMS电路图(2)

图7.NTBMS电路图(3)

图8.NTBMS电路图(4)

图9.NTBMS电路图(5)
详情请见:
https://www.nxp.com/docs/en/data-sheet/NewTec_DataSheet.pdf
https://www.nxp.com/docs/en/user-guide/NewTec_User_Manual_NTBMS.pdf
以及https://www.nxp.com/downloads/en/schematics/SCH-NEWTEC.pdf
SCH-NEWTEC.pdf
NewTec_DataSheet.pdf
NewTec_User_Manual_NTBMS.pdf

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