瑞萨电子 汽车BMS ISL78714 14芯锂离子电池管理器
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件瑞萨电子的汽车级 (AEC-Q100) 锂离子电池管理解决方案 (BMS) 专为满足新一代电动汽车应用的严格安全性、可靠性和性能要求而设计。
我们的电池平衡和安全产品组合采用高度集成的 ISL78714、ISL78600 和 ISL78610 锂电池管理系统和安全监控 IC，具有众多优势，并显著减少混合动力、插电式混合动力及电动车 (HEV/PHEV/EV) 电池组及其相关系统的总体电池管理成本。
瑞萨电子还提供 ISL78692 和 ISL78693 汽车级单芯电池充电器，可延长车载紧急呼叫（eCall）系统中使用的锂离子 (Li-ion)、锂聚合物 (Li-polymer) 和磷酸铁锂（LiFePO4）电池续航时间。
ISL78714 提供精确的电池电压和温度监控，以及电池平衡和全面的系统诊断，从而保护14芯锂离子电池组。
OVERVIEW
The ISL78714 automotive grade Li-ion battery manager IC supervises up to 14 series connected cells and is optimized to meet stringent automotive performance, reliability, and safety requirements. The device provides all the functions expected of such a critical component in a battery management system, such as accurate cell voltage and temperature monitoring, cell balancing, and extensive system diagnostics.
In a typical configuration, a master ISL78714 communicates to a host microcontroller through an SPI port and up to 29 additional ISL78714 devices connected together by a robust, proprietary, two-wire daisy chain. This communication system is highly flexible and can be implemented with capacitor isolation, transformer isolation, or a combination of both.
Three cell balancing modes are included: Manual Balance mode, Timed Balance mode, and Auto Balance mode. Auto Balance mode terminates balancing after a host-specified amount of charge has been removed from every cell.
The ISL78714 is packaged in a 64 pin TQFP and is specified for operation from -40ºC to +105ºC.
KEY FEATURES
- Monitors and manages up to 14 cells; all standard Li-Ion cell chemistries
- Supports ASIL D systems
- Robust two-wire daisy chain communications system using capacitor or transformer coupling at up to 1Mbps
- High security communications protocol per ISO26262
- Cell voltage measurement accuracy
- 1.65V to 4.28V; -20ºC to +85ºC:
- Initial Device accuracy: ±2mV
- Post board assembly Device accuracy: ±2.5mV
- Cell input range: ±5.0V, negative voltages ideal for bus bars
- Up to six external temperature monitoring inputs
- Internal temperature monitoring with warning flag
- Two general purpose I/O pins
- Automatic sensing of position in battery stack
- Measures and performs read-back on all voltages, temperatures, and diagnostics for 112 cells in less than 10ms
- User-selectable cell measurement averaging function
- 14-bit voltage and temperature measurements
- Integrated system diagnostics for all key functions
- Watchdog shuts down device if communication is lost
- Pb-free (RoHS compliant)
- Long term drift: -0.31 log(khrs)
- Fully tolerant to EMC and transients
- Hybrid Electric Vehicle (HEV), Plug-in Hybrid Electric Vehicle (PHEV), and Electric Vehicle (EV) battery packs
- Electric motorcycle battery packs
- Backup battery and energy storage systems requiring high accuracy management and monitoring
- Portable and semi-portable equipment