bq76PL536A-Q1主要特性及锂电池监视和保护参考设计

TI公司的bq76PL536A-Q1是可堆栈的三--六颗锂电池组保护器和模拟前端(AFE),集成了精密的ADC,单独的电池电压和温度保护,电池平衡和给用户电路供电的精密V稳压器.电源电压从7.2 V 到 27 V,主要用在电动和混合动力汽车,电动自行车和电动滑板车,不间断电源(UPS)和大型电池系统.本文介绍了bq76PL536A-Q1主要特性,框图和简化的系统连接图以及锂电池监视和保护参考设计TIDA-00821主要特性,框图,电路图,材料清单和PCB设计图.

　　The bq76PL536A-Q1 is a stackable three to six series cell lithium-ion battery pack protector and analog front end （AFE） that incorporates a precision analog-to-digital converter （ADC）; independent cell voltage and temperature protection; cell balancing， and a precision 5-V regulator to power user circuitry.

　　The bq76PL536A-Q1 integrates a voltage translation and precision analog-to-digital converter system to measure battery cell voltages with high accuracy and speed.

　　The bq76PL536A-Q1 provides full protection （secondary protection） for overvoltage， undervoltage， and overtemperature conditions. When safety thresholds are exceeded， the bq76PL536A-Q1 sets the FAULT output. No external components are needed to configure or enable the protection features.

　　Cell voltage and temperature protection functions are independent of the ADC system. Programmable protection thresholds and detection delay times are stored in Error Check/Correct （ECC） OTP EPROM， which increases the flexibility and reliability of the battery management system.

　　The bq76PL536A-Q1 is intended to be used with a host controller to maximize the functionality of the battery management system. However， the protection functions do not require a host controller.

　　The bq76PL536A-Q1 can be stacked vertically to monitor up to 192 cells without additional isolation components between ICs. A high-speed serial peripheral interface （SPI） bus operates between each bq76PL536A-Q1 to provide reliable communications through a high-voltage battery cell stack.

　　bq76PL536A-Q1主要特性：

　　• Three-to-six series cell support， all chemistries

　　• Hot-pluggable

　　• High-speed serial peripheral interface （SPI） for data communications

　　• Stackable vertical interface

　　• Isolation components not required between devices

　　• Qualified for automotive applications

　　• AEC-Q100 qualified with the following results：

　　– Device temperature grade 2： –40℃ to 105℃ ambient operating temperature range

　　– Device HBM classification level 2

　　– Device CDM classification level C4B

　　• High-accuracy ADC：

　　– ±1-mV typical accuracy

　　– 14-bit resolution， 6-μs conversion time

　　– Nine ADC inputs

　　– Dedicated pins for synchronizing measurements

　　• Configuration data stored in error check/correct（ECC）one-time-programmable （OTP）registers

　　• Built-in comparators （secondary protector） for：

　　– Overvoltage and undervoltage protection

　　– Overtemperature protection

　　– Programmable thresholds and delay times

　　– Dedicated fault signals

　　• Cell balancing control outputs with safety timeout

　　– Balance current set by external components

　　• Supply voltage range from 7.2 V to 27 V continuous and 36-V peak

　　• Low power：

　　– Typical 12-μA sleep， 45-μA idle

　　• Integrated precision 5-V，3-mA LDO

　　bq76PL536A-Q1应用：

　　Electric and Hybrid Electric Vehicles

　　E-Bike and E-Scooter

　　Uninterruptible Power Systems （UPS）

　　Large-Format Battery Systems

　　bq76PL536A-Q1终端设备：

　　EV HEV Battery Management System

　　HEV/EV - Battery Management System （BMS）

图1.bq76PL536A-Q1框图

　　图2.bq76PL536A-Q1简化的系统连接图

　　bq76PL536A-Q1参考设计TIDA-00821

　　The TIDA-00821 reference design is a stackable monitor and protector for use in large format Lithium-ion batteries that provides monitoring， balancing， and communications. Each bq76PL536A-Q1 EVM can manage 3 to 6 cells for Li-ion battery applications. Up to 32 bq76PL536A-Q1 EVM modules can be stacked. The system provides fast cell balancing， diagnostics， and module to controller communication. Independent protection circuitry isalso integrated.

　　参考设计TIDA-00821主要特性：

　　Highly accurate monitoring and protection

　　Engineered for high system robustness

　　1-Mb/s stackable vertical interface

　　Built in comparator for secondary OV， UV and OT protector

　　Cell balancing control output with safety timeout

图3.参考设计TIDA-00821外形图

图4. bq76PL536A-Q1 EVM-3测试建立图

图5.参考设计TIDA-00821框图

图6.参考设计TIDA-00821电路图(1)

图7.参考设计TIDA-00821电路图(2)

图8.参考设计TIDA-00821电路图(3)

图9.参考设计TIDA-00821电路图(4)

参考设计TIDA-00821材料清单(BOM):

 

图10.参考设计TIDA-00821 PCB设计图(1)

图11.参考设计TIDA-00821 PCB设计图(2)

图12.参考设计TIDA-00821 PCB设计图(3)

图13.参考设计TIDA-00821 PCB设计图(4)

图14.参考设计TIDA-00821 PCB设计图(5)

图15.参考设计TIDA-00821 PCB设计图(6)

图16.参考设计TIDA-00821 PCB设计图(7)

图17.参考设计TIDA-00821 PCB设计图(8)