Texas Instruments introduces industry-leading wireless BMS solution to revolutionize electric vehicle battery management

After years of continuous development, automobile electrification has achieved remarkable results. However, how to improve the endurance of electric vehicles is still one of the most important technical problems at present, and the innovation of battery management system is the core of breaking through the problem. Texas Instruments has announced a major advance in electric vehicle (EV) battery management systems (BMS) with the release of an industry-leading wireless BMS solution that is the first independently evaluated functional safety concept. By using a wireless protocol with industry-leading network availability, TI's wireless BMS solution demonstrates how vehicle designers can reduce heavy, expensive and frequently maintained cabling and improve the reliability and efficiency of electric vehicles worldwide.

TI's wireless BMS solutions enable automakers to reduce the complexity of their designs, improve reliability and reduce vehicle weight, resulting in longer driving range. Thanks to the flexibility to adapt designs across production models, automakers can transition to the production phase faster with TI's comprehensive wireless BMS offering, which includes: SimpleLink™2.4GHzCC2662R-Q1 Wireless Microcontroller (MCU) evaluation modules, software and functional safety driver tools (such as safety manuals; Failure mode and impact analysis FMEA; Failure mode impact and diagnostic analysis FMEDA; TUV SUD Concept reports, etc.). For more information, see the blog post "Future electric cars with Longer ranges and Fewer Wires."

"The adoption of wireless battery management systems will be a growing trend in the electric vehicle market, as such advances offer greater design flexibility and reduced complexity and cost relative to traditional systems," said Asif Anwar, head of Powertrain, Body, Chassis and safety services at Strategy Analytics. "TI has demonstrated a solution that combines these benefits with ASIL D compliance, setting a standard for the industry to follow."

Meets ASIL D requirements of ISO 26262

To reduce development time for automakers, TI has asked TUV SUD, a leading functional safety authority, to conduct an independent feasibility assessment of: The quantitative and qualitative error detection performance of the TI Wireless BMS functional safety concept, automotive manufacturers meet the Automotive Safety Integrity level ASIL D certification, and the higher level of the International Organization for Standardization (ISO)26262 certification.

TI's Wireless BMS functional Safety concept addresses communication error detection and security with a new wireless protocol developed specifically for wireless BMS use cases. The proprietary protocol implemented by the CC2662R-Q1 wireless MCU enables stable, reliable and scalable data exchange between the host system processor and the newly released BQ79616-Q1 battery monitor and weigher.

Secure industry-leading network availability

Compared to wired connectivity, TI's wireless protocol for the battery management system is implemented through the CC2662R-Q1 wireless MCU, which can provide industry-leading network availability (more than 99.999%) and greater availability for 300ms network restart. The wireless MCU provides dedicated time slots with high throughput and low latency to prevent data loss or corruption, while enabling multiple battery cells to send voltage and temperature data to the main MCU with ±2mV accuracy and a network packet error rate of less than 10-7. Automakers can leverage TI's security-driven tools to reduce potential threats, such as: key exchange and refresh; Unique device authentication; Debugging security; Software IP protection based on Joint Test Action Team (JTAG) protocol locking; Advanced Encryption Standard (AES) 128-bit encryption acceleration and message integrity checking.

Reliable scaling and system-level design on multiple platforms

Considering the long-term design needs of automobile manufacturers, TI's wireless BMS innovation technology is more scalable in the industry. The deterministic protocol provides higher throughput in the market and enables vehicle manufacturers to connect battery modules using a single wireless system-on-chip with multiple BQ79616-Q1 battery monitors in different battery configurations, such as systems with 32, 48 and 60 cells. The system is designed to support up to 100 nodes, each with industry-low latency (less than 2ms), and measurements at each node can be time-synchronized. The CC2662R-Q1 wireless MCU is independent of the individual battery cell monitoring devices, eliminating the need for Daisy chain isolation components, thus reducing the corresponding cost. The BQ79616-Q1 battery monitor and balance offer different channel options in the same package type, while providing pin-to-pin compatibility and enabling full reuse of existing software and hardware on any platform.