Li-ion battery monitor chipset ensures battery life in HEVs and EVs

November 09, 2012 // By Christoph Hammerschmidt
Toshiba Electronics Europe (TEE) has announced the launch a Li-ion battery monitor chipset for automotive applications. Designed for Hybrid Electric Vehicles (HEVs) and Electric Vehicles (EVs), the chipset comprises the TB9141FG monitoring IC and the TMPM358FDTFG microcontroller. The product detects remaining battery level, equalizes battery levels (cell balancing) and can detect abnormal battery status.

The TB9141FG is industry's first monitoring IC1 that monitors up to 16 cells, which can lead to component count reduction in a battery monitoring system. Furthermore, the TB9141FG is able to communicate in a noisy environment by differential signals using daisy chain communication with neighbouring TB9141FGs.

The TMPM358FDTFG is a 32-bit RISC microcontroller built around an ARM Cortex-M3 core and compliant with functional safety levels (IEC61508 / ISO26262).

The company announced to prepare a software library which will be compliant with the IEC61508 and ISO26262 functional safety standards and is also planning reference models. These tools will simplify the implementation of battery monitoring systems.

The TB9141FG uses a 96V process and realizes 16-cell li-ion battery monitoring with a single IC. As a result, the TB9141FG contributes to the development of battery monitoring systems with fewer parts and at lower cost. It uses differential signal communication in a daisy chain topology ensuring stable communications with other TB9141FG devices, even in a noisy environment. This is an important issue for battery monitoring in automotive applications.

The device realizes typical ±2mV cell voltage measurement accuracy, improving the accuracy of battery state of charge (SOC) detection and contributing to more effective battery usage. It incorporates a cell balance switch and is able to measure battery voltage while cell balancing. For use in ISO26262-compliant systems it also TB9141FG incorporates many self-test functions.

Sampling of the shipments chipset will start in February 2013, and mass production in April 2014, the company said.

For more information visit http://www.toshiba-components.com/