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Date: 10-01-21

Latest advanced wireless battery management solutions from TI

Electrical vehicles are going for wireless battery management, since that can save designers from complex wiring and also reduce the weight of electric vehicle. To address this trend, analog and mixed signal semiconductor chip vendor Texas Instruments has made available semiconductor solutions to wirelessly monitor and manage batteries.

The latest solution from Texas Instruments offers the SimpleLink 2.4-GHz CC2662R-Q1 wireless microcontroller (MCU) evaluation module, software and functional safety enablers such as a functional safety manual; failure mode and effects analysis (FMEA); diagnostic analysis (FMEDA); TÜV SÜD concept report; and more.

“The implementation of wireless battery management systems will be a growing trend in the EV marketplace because these advancements provide greater flexibility of design while also lowering the complexity and cost relative to traditional systems,” said Asif Anwar, director of the powertrain, body, chassis and safety service at Strategy Analytics. “By demonstrating a solution that combines these advantages with ASIL D compliance, the TI solution sets a benchmark for the industry to follow.”

TI said it had requested  TÜV SÜD, the industry’s leading functional safety authority to independently evaluate the quantitative and qualitative error-detection performance as well as the feasibility for automakers to achieve Automotive Safety Integrity Level (ASIL) D, the highest level of International Organization for Standardization (ISO) 26262 certification, using TI’s wireless BMS functional safety concept.

Using a new wireless  proprietary protocol via the CC2662R-Q1 wireless MCU, robust and scalable data exchange between a host system processor and the newly announced BQ79616-Q1 battery monitor and balancer is ensured.  

The new solution is designed to offer network availability of greater than 99.999% and a network restart of 300-ms maximum availability. With this wireless MCU, dedicated time slots that provide high throughput and low latency protect data from loss or corruption while enabling multiple battery cells to send voltage and temperature data to the main MCU with ±2-mV accuracy and a network packet error rate of less than 10-7. Automakers can mitigate potential threats with security enablers from TI such as key exchange and refreshment; unique device authentication; debug security; software IP protection with a joint test action group (JTAG) lock; Advanced Encryption Standard (AES) 128-bit cryptographic acceleration and message integrity checks, says TI.

The solution is also scalable providing  high throughput in the market.  It allows automakers to create a battery module using a single wireless system-on-chip connected with multiple BQ79616-Q1 battery monitors for different configurations such as 32-, 48- and 60-cell systems. Support up to 100 nodes and low latency of less than 2 ms per node and time-synchronized measurements across every node.

Since CC2662R-Q1 wireless MCU isolates individual cell monitoring units there is no need of daisy-chain isolation components.  Pin to pin compatible BQ79616-Q1 battery monitor and balancer available in different channel options in the same package type.

Along with the software development kit (SDK) which is  available at no cost other components can be purchased online at TI.com.

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