應用領域： 汽車電子

主控芯片：MC33771

方案概述

1、方案詳情：

基于MC33771 （鋰電池管理芯片AFE） + MC33664 （高速變壓器隔離驅動） + MC9S12XET256/MPC5744 （車規級MCU/PowerPC ） + TJA1052I （車規級隔離CAN通訊）打造的產品級解決方案。

方案分為兩個版本：

一是符合功能安全的高安全等級BMS系統；

二是普通安全等級BMS系統。

方案完全適用于物流車、乘用車、大巴車等多種新能源車型。

2、方案框圖：

3、方案特點：

4、主要器件：

5、支持服務：

MC33771介紹

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

【相關信息】基于MC33771的電池管理系統（BMS）

電池管理系統（BATTERY MANAGEMENT SYSTEM 簡稱BMS）是電池與用戶之間的紐帶，主要對象是二次電池。二次電池存在下面的一些缺點，如存儲能量少、壽命短、串并聯使用問題、使用安全性、電池電量估算困難等。電池的性能是很復雜的，不同類型的電池特性亦相差很大。 電池管理系統（BMS）主要就是為了能夠提高電池的利用率，防止電池出現過度充電和過度放電，延長電池的使用壽命，監控電池的狀態。隨著電池管理系統的發展，也會增添其它的功能。

恩智浦公司推出的14通道鋰離子電池控制器MC33771，支持菊花鏈鏈接，最多可級聯15塊芯片；以及配套推出的隔離網絡高速收發器MC33664，能將MCU的SPI數據流轉換為差分信號。加上其特有的汽車級架構MCU等組成了一套完成的BMS方案。

如圖1所示是基于MC33771的BMS框架圖，從圖中可以看出其外圍電路非常簡潔，因為其內部集成了電壓電流ADC采集、內置最大300mA均衡MOS管等電路，大大減少了外圍電路降低成本，同時也降低了用戶的開發周期和開發難度。如下是基于MC33771的BMS方案優點介紹。

MC33771通過ASIL-C等級認證，系統功能安全等級達ASIL-D等級

寬工作電壓范圍9.6V～61.6V（支持70V的瞬時電壓），直接從電池單元供電；

每顆IC能夠管理8～14節電池單元，且最高支持15顆IC通過菊花鏈形式級聯；

MC33664支持高達2.0Mbps的隔離差分信號（TPL）通信和4.0Mbps的SPI通信；

采用先進的菊花鏈通信方式并且支持咬尾設計大大增加了通信的安全和穩定性。

芯片內部集成高達300mA的被動均衡管理MOS管；

支持欠壓、過壓、過熱、開路、短路、漏電等故障檢測和自檢功能；

高精度檢測電壓和電流并集成庫侖計功能；

每顆MC33771支持7路GPIO/溫度傳感器輸入，且支持熱插拔；

周立功單片機科技有限公司已全面推廣基于MC33771的BMS方案，歡迎大家前來咨詢。