基于NEWTEC－NTBMS的高等级ASIL C汽车电池管理参考设计

电子工程师 2019-04-05 4638

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描述

nxp公司的NEWTEC－NTBMS是汽车功能安全完整性等级高达ASIL C的汽车电池管理参考设计，和ISO 26262标准ASIL C兼容，包括两块板：功能安全系统模块（Safety SoM）和电池管理系统（BMS）应用板.Safety SoM基于NXP公司的S32K144和KEA微控制器和FS4503C安全电源系统.BMS应用板基于NXP公司的电池控制器，能够永久测量电池电压，超温保护，过流/过压检测，欠压检测（短路），安全继电器控制（ASIL C），非故意的继电器闭合和断开，各种定义的安全状态以及LIN和CAN总线接口，可控制多达6个锂电池，连续载流能力200A，最大电流800A，主要用在汽车BMS，智能电网和其它电池管理系统（医疗，电动自行车，轻型交通和工业）。本文介绍了NewTec NTBMS主要特性，框图，技术数据以及安全特性高达ASIL C电池管理参考设计NEWTEC-NTBMS主要特性，框图，建力图和电路图。

NewTec NTBMS is an e-mobility reference design and complete safety support package for Battery Management Systems. It is constructed with a two boards approach a functional safety System-on-Module （Safety SoM） board and a Battery Management System （BMS） application board. The Safety SoM is based on NXP＇s S32K144 and KEA microcontrollers， and FS4503C safety power system. The BMS application board is based on NXP＇s MC33772B battery cell controller IC. The support package includes the necessary safety documentation and software for certification purposes. It is intended for device manufacturers with Lithium-ion batteries and suppliers of automotive or industrial applications with a high degree of reliability and safety in accordance with ISO 26262 targeting safety level up to ASIL C， or IEC61508 SIL2.

Typical use cases would be：

Automotive Battery Management System for 14V auxiliary battery

Monitoring of starter batteries

Extendable to 48V battery systems

Stationary Energy Storage systems; Smart Grid

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 charge

regulator 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.

NewTec NTBMS主要特性：

Permanent measurement of cell voltages

Over-temperature protection

Overcurrent / overvoltage detection

Undervoltage detection （short circuit）

Safe relay （breaker） control （ASIL C）

Unintended relay close

Unintended relay open

Various definable Safe States

LIN and CAN bus interface

Crash detection

Overcurrent control fuse

Power supply with watchdog protection

Control of up to 6 Lithium-ion battery cells

Electrical current carrying capability： 200 A continuous current， 800 A maximum current

Operating Current 《 25 mA@RT

Intrusive diagnostics （performed by MCU）

Memory storage （RAM& flash）

Power management （low power and normal mode）

All components AEC-Q qualified

Programmable in C

客户效益：

_ 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

NEWTEC-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）

技术数据：

Power Supply

The device is designed for operation with 12V to 18V DC power

Supply. Operation with other supply voltages is not permitted.

The supply voltage is connected via the connection cable provided

for this purpose.

Environmental Conditions

Temperature

The device is designed for storage and operations at the followingtemperature ranges：

_ Storage temperature： -15°C to +70°C

_ Operating temperature： 0°C to +40°C

Battery Characteristics

Electrical current carrying capability for shunt resistor

_ 250 A permanent;

_ 600 A for 40 s;

_ 1400 A for 1 s

Battery Management System current

_ operating current 《 25 mA@RT

Other Characteristics

_ 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1.NTBatteryManagementSystem（NTBMS）框图

NEWTEC-NTBMS：安全特性高达ASIL C电池管理参考设计

NEWTEC-NTBMS： The Battery Management Reference Design with Functional Safety Features up to ASIL C

The application is a Battery Management System （BMS） evaluation platform for a14V 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 ASILC 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

This product is a reference design platform for the development of safety-critical battery management systems and applications. In no case must it be installed or used in vehicles or medical equipment. Military use of this product is not permitted.

This product may only be used in workshops and laboratories by trained specialist personnel. It may only be connected to the following components：

 Battery Pack with up to 6 cells and 3 Temperature Sensors TBD Max Voltage， Max current

 Power Supply， 14V， with sufficient power for Battery Pack charging

 Battery Pack with 3 Temperature Sensors and up to 6 cells， max Voltage： 14V

 Fuse with fitting characteristic for Battery Pack

 Breaker Relay， recommended type： TE Connectivity V23130-C2021-A400 （max current 190A）

参考设计NEWTEC-NTBMS包括：

Evaluation Board

Schematic / Layout / Gerber Files

Quick-Start-Guide

Safety How-to-Guide for ASIL C

Application Software