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Renesas Launches 14-Cell Li-ion Battery Management IC

Renesas Electronics Corporation has introduced its fourth-generation lithium-ion (Li-ion) battery management IC that offers unmatched lifetime accuracy.

Renesas Electronics

The ISL78714 provides accurate cell voltage and temperature monitoring, along with cell balancing and extensive system diagnostics to protect 14-cell Li-ion battery packs while maximizing driving time and range for hybrid and electric vehicles (HEV/MHEV/PHEV/BEV).

Niall Lyne, Senior Director of Product Marketing and Applications, Automotive Mixed-Signal/Power and Video, Renesas Electronics Corporation, added, “Our Formula E technology partnership with Mahindra Racing is already helping them win on the race track. Together, we designed and integrated a low-voltage Li-ion battery management system featuring ISL78714 ICs and RH850 microcontrollers in Mahindra Racing electric race cars.”

The feature-rich ISL78714 monitors and balances up to 14 series-connected cells with ±2mV accuracy across automotive temperature ranges, letting system designers make informed decisions based on absolute voltage levels. The ISL78714 includes a precision 14-bit analog-to-digital converter and associated data acquisition circuitry. The device also offers up to six external temperature inputs (two available from GPIOs) and includes fault detection and diagnostics for all key internal functions.

The ISL78714 meets the stringent reliability and performance requirements of battery pack systems for all EV variants including HEV/PHEV, with safety features enabling automotive manufacturers to achieve the ISO 26262 automotive safety integrity level (ASIL D). In addition, the ISL78714 monitors and reads back over/under voltage, temperature, open-wire conditions, and fault status for 112 cells in less than 10ms, or 70 cells in 6.5ms.

Multiple ISL78714’s can be connected together via a proprietary daisy chain that supports systems up to 420 cells (30 ICs) that provide industry-leading transient and EMC/EMI immunity, exceeding automotive requirements. The ISL78714’s daisy-chain architecture uses low-cost capacitive or transformer isolation, or a combination of both, with twisted-pair wiring to stack multiple battery packs together while protecting against the hotplug and high voltage transients. A watchdog timer automatically shuts down a daisy-chained IC if communications is lost with the master MCU.

The Key Features of ISL78714 Battery Management IC

  • Monitors and manages up to 14 cell voltages with ±2mV measurement accuracy
  • Robust two-wire daisy chain communications system using capacitor or transformer coupling up to 1 Mbps
  • Fully differential cell input range of ±5V accommodates fuel cell and bus bar measurement requirements for aging battery packs
  • 15-year board level accuracy (long term drift) of ±6mV @ ±6σ
  • High diagnostic coverage for cell voltage and temperature measurements
  • AEC-Q100 Grade-2 qualified and specified for operation from -40°C to +105°C

A battery management system (BMS) reference design is available, which includes five ISL78714 ICs and an RH850/P1M MCU to form a complete 70-cell evaluation platform for external balancing.

Availability

Mass production quantities of the ISL78714 Li-ion battery management IC are available now in a 64-lead TQFP package.

Further information: Click Here

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Jyoti Gazmer

A Mass Comm. graduate believes strongly in the power of words. A book lover who dreams to own a library some day. An introvert but will become your closest friend if you share mutual feelings about COFFEE. I prefer having more puppies over humans.

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