Intersil Corporation, a designer and manufacturer of high-performance analog, mixed signal and power management semiconductors, introduced a system solution for hybrid and electric vehicle (HEV/EV) battery management control, featuring an automotive-grade Li-Ion battery management system and safety monitor.
ISL78600 Management System. The automotive grade (AEC-Q100) ISL78600 multi-cell management system is specifically designed and tested to address the safety, reliability and performance requirements of the hybrid, plug-in hybrid (PHEV) and electric vehicle markets. To address the stringent safety requirements of the automotive market, Intersil’s HEV/EV solution provides customers with ISO26262 (ASIL) compliance to prevent battery pack failures. The solution also provides built-in fault detection for all of its major internal functions and detects external faults such as open wire, over and under voltage as well as temperature and cell balancing faults.
Each ISL78600 device utilizes a 14-bit temperature compensated data converter that scans 12 channels in less than 250 microseconds. Average mid-size HEV vehicles today utilize 126 to 168 cells, which can be addressed with 11 to 14 ISL78600s per vehicle. When combined with four external temperature sensors, the ISL78600 provides superior accuracy for state-of-charge measurements across the full battery operating temperature range.
To achieve reliable intra-system communication, the ISL78600 utilizes a high noise immunity and transient tolerant communication scheme. This fully differential daisy-chain architecture allows the use of low-cost twisted-pair wiring to stack multiple battery packs together while protecting against hot plugging and high voltage transients.
The ISL78600 allows for easy connection to microcontrollers via either a 2.5MHz SPI or 400kHz I2C interface, and is specified for -40°C to 105 °C operation. While targeted at the HEV/EV market, the Intersil solution can easily be adapted to address industrial and battery back-up applications.
ISL78601 Safety Monitor. Addressing the safety requirements of an HEV/EV battery system, Intersil’s ISL78601 multi-cell battery monitor provides a 12-channel automotive grade Li-Ion battery fault and safety monitor.
The ISL78601 provides independent and redundant fault monitoring when used in conjunction with the ISL78600 battery management system. To achieve reliability for intra-system communication, the ISL78601 utilizes a high noise immunity and transient tolerant communication scheme. This fully differential daisy-chain architecture allows the use of low cost twisted pair wiring to stack multiple battery packs together while protecting against hot plugging and high voltage transients.
As part of the system’s safety features, the ISL78601 has extensive built-in fault detection for its internal functions and detects external faults such as over and under voltage. The device also includes a watchdog timer to detect communication failures.
The ISL78601 allows for easy connections to microcontrollers via either a 2.5MHz SPI or 400kHz I2C interface, and is specified for -40 °C to 105 °C operation.