基于NEWTEC－NTBMS的高等級ASIL C汽車電池管理參考設(shè)計

nxp公司的NEWTEC－NTBMS是汽車功能安全完整性等級高達ASIL C的汽車電池管理參考設(shè)計，和ISO 26262標準ASIL C兼容，包括兩塊板：功能安全系統(tǒng)模塊（Safety SoM）和電池管理系統(tǒng)（BMS）應(yīng)用板.Safety SoM基于NXP公司的S32K144和KEA微控制器和FS4503C安全電源系統(tǒng).BMS應(yīng)用板基于NXP公司的電池控制器，能夠永久測量電池電壓，超溫保護，過流/過壓檢測，欠壓檢測（短路），安全繼電器控制（ASIL C），非故意的繼電器閉合和斷開，各種定義的安全狀態(tài)以及LIN和CAN總線接口，可控制多達6個鋰電池，連續(xù)載流能力200A，最大電流800A，主要用在汽車BMS，智能電網(wǎng)和其它電池管理系統(tǒng)（醫(yī)療，電動自行車，輕型交通和工業(yè)）。本文介紹了NewTec NTBMS主要特性，框圖，技術(shù)數(shù)據(jù)以及安全特性高達ASIL C電池管理參考設(shè)計NEWTEC-NTBMS主要特性，框圖，建力圖和電路圖。

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

客戶效益：

_ 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典型應(yīng)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）

技術(shù)數(shù)據(jù)：

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

圖1.NTBatteryManagementSystem（NTBMS）框圖

NEWTEC-NTBMS：安全特性高達ASIL C電池管理參考設(shè)計

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）

參考設(shè)計NEWTEC-NTBMS包括：

Evaluation Board

Schematic / Layout / Gerber Files

Quick-Start-Guide

Safety How-to-Guide for ASIL C

Application Software

Complete Safety Documentation Templates for Certification

圖2.NEWTEC-NTBMS基板&NTSafeSOMmicro外形圖

圖3.NTBMS建立圖

圖4：參考設(shè)計NEWTEC-NTBMS電路圖（1）

圖5：參考設(shè)計NEWTEC-NTBMS電路圖（2）

圖6：參考設(shè)計NEWTEC-NTBMS電路圖（3）

圖7：參考設(shè)計NEWTEC-NTBMS電路圖（4）

圖8：參考設(shè)計NEWTEC-NTBMS電路圖（5）