基于MC33771主控芯片的新能源锂电池管理系统解决方案

应用领域： 汽车电子

主控芯片：MC33771

方案概述

1、方案详情：

基于MC33771 （锂电池管理芯片AFE） + MC33664 （高速变压器隔离驱动） + MC9S12XET256/MPC5744 （车规级MCU/PowerPC ） + TJA1052I （车规级隔离CAN通讯）打造的产品级解决方案。

方案分为两个版本：

一是符合功能安全的高安全等级BMS系统；

二是普通安全等级BMS系统。

方案完全适用于物流车、乘用车、大巴车等多种新能源车型。

2、方案框图：

3、方案特点：

4、主要器件：

5、支持服务：

MC33771介绍

Title：14 Channel Li-ion Battery Cell Controller IC

Description：The MC33771 is a Li-Ion Battery Cell Controller IC designed for automotive and industrial applications such as HEV, EV , ESS, UPS systems.The device performs ADC conversions on the differential cell voltages and currents as well as coulomb counting and temperature measurements. The device features embedded balancing transitors as well as a rich amount of diagnostics features to simplify applications. It communicates through SPI or transformer isolation to a microcontroller for processing and control.

Company Freescale Semiconductor

Features, Applications

Battery Cell Controller and Transformer Physical Layer

Freescale's MC33664 transformer physical layer and MC33771 battery cell controller solution enables reliable, safe and bill of materials (BOM) optimized Li-ion cell control applications with low-cost, robust, high-speed isolated communication. These fully integrated battery monitoring devices are for automotive and industrial mission critical applications. Battery topology flexibility is supported with compatibility including 48 V batteries with one analog front end (AFE). High speed and robust daisy chain is used as an alternative to CAN solutions. Fast data acquisition and communication to the pack controller can be achieved in only 2.6 ms for the pack controller to acquire conversions from 96 cells. Also, determination of individual cell impedances in one shot is synchronized for cell voltages and current measurements within 65 us. With functional verification and diagnostics, the MC33664 and MC33771 support ISO 26262 SafeAssure functional safety. Functional verification of cell measure, current measure, cell terminal openings or leakage and ADC precision checks are all performed.

High-voltage battery management systems 800 V) 48 V battery management systems

Energy storage systems (ESS) Uninterrupted power supply (UPS) E-bikes, E-scooters

Features

Integrated current channel and Coulomb counting Integrated current channel synchronized with cell voltage measurements Optional high speed isolated or SPI communication High speed (2 Mbps) isolated high speed differential communication Fast data acquisition and communication to pack controller Robust against hot plug and random cell connection ESD/EMC robustness Supports ISO 26262 SafeAssure functional safety with single package solution Low-level drivers

Reduces BOM for 48 V battery applications (only one AFE required) Determination of individual cell impedances in one shot for improved SoC/SoH prediction Addresses all existing battery management system topologies (centralized, distributed daisy chain, distributed CAN) Allows BOM cost reduction by transition from CAN to daisy chain without compromise on communication speed Determination of individual cell impedances in one shot, synchronized cell voltages and current measurements within us No pre-damaging of cell and no damaging of devices during customer battery/electronics assembly ESD/EMC robustness avoids external components for robustness protection (BOM reduction, board space reduction) Has functional verification and diagnostics Simplifies software development and reduces switching cost

9.6 V VPWR 61.6 V operation, 70 V transient SPI or Isolated 2 MHz differential communication 14x differential cells voltage and stack voltage measurements Synchronized cell voltage/current measurement with Coulomb counting 7x ADC/GPIO/temperature sensor inputs Addressable on initialization Onboard 300 mA passive cell balancing Low-power modes 64-pin QFP package

Battery Cell Controller Transformer Physical Layer Analog Product Selector Guide Automotive Product Selector Guide Industrial Product Selector Guide

Description

Data Sheet Data Sheet Selector Guide Selector Guide Selector Guide

Expanding on more than 30 years of innovation, Freescale is a leading provider of high-performance products that use SMARTMOS technology combining digital, power and standard analog functions. Freescale supplies analog and power management ICs that are advancing the automotive, consumer, industrial and networking markets. Analog solutions interface with real world signals to control and drive for complete embedded systems.

Freescale, SafeAssure, SafeAssure logo and the Freescale logo are trademarks of Freescale Semiconductor, Inc., Reg. U.S. Pat. & Tm. Off. SMARTMOS is a trademark of Freescale Semiconductor, Inc. All other product or service names are the property of their respective owners. © 2014 Freescale Semiconductor, Inc. Document Number: MC33664FS REV 1

【相关信息】基于MC33771的电池管理系统（BMS）

电池管理系统（BATTERY MANAGEMENT SYSTEM 简称BMS）是电池与用户之间的纽带，主要对象是二次电池。二次电池存在下面的一些缺点，如存储能量少、寿命短、串并联使用问题、使用安全性、电池电量估算困难等。电池的性能是很复杂的，不同类型的电池特性亦相差很大。 电池管理系统（BMS）主要就是为了能够提高电池的利用率，防止电池出现过度充电和过度放电，延长电池的使用寿命，监控电池的状态。随着电池管理系统的发展，也会增添其它的功能。

恩智浦公司推出的14通道锂离子电池控制器MC33771，支持菊花链链接，最多可级联15块芯片；以及配套推出的隔离网络高速收发器MC33664，能将MCU的SPI数据流转换为差分信号。加上其特有的汽车级架构MCU等组成了一套完成的BMS方案。

如图1所示是基于MC33771的BMS框架图，从图中可以看出其外围电路非常简洁，因为其内部集成了电压电流ADC采集、内置最大300mA均衡MOS管等电路，大大减少了外围电路降低成本，同时也降低了用户的开发周期和开发难度。如下是基于MC33771的BMS方案优点介绍。

MC33771通过ASIL-C等级认证，系统功能安全等级达ASIL-D等级

宽工作电压范围9.6V～61.6V（支持70V的瞬时电压），直接从电池单元供电；

每颗IC能够管理8～14节电池单元，且最高支持15颗IC通过菊花链形式级联；

MC33664支持高达2.0Mbps的隔离差分信号（TPL）通信和4.0Mbps的SPI通信；

采用先进的菊花链通信方式并且支持咬尾设计大大增加了通信的安全和稳定性。

芯片内部集成高达300mA的被动均衡管理MOS管；

支持欠压、过压、过热、开路、短路、漏电等故障检测和自检功能；

高精度检测电压和电流并集成库仑计功能；

每颗MC33771支持7路GPIO/温度传感器输入，且支持热插拔；

周立功单片机科技有限公司已全面推广基于MC33771的BMS方案，欢迎大家前来咨询。