How can the Electric vehicle battery management system improve the efficiency and reliability of global electric vehicles?
As is well known, batteries are the most expensive component in electric vehicles (EVs). In fact, the total cost of batteries accounts for 25% to 40% of the total cost of typical electric vehicles, which is a major obstacle that still needs to be overcome in order to bring affordable electric vehicles to the market and make them more widely adopted by the public. Due to the obvious high cost of replacing batteries, the focus of car manufacturers has shifted to trying to extend their lifespan and charge as much as possible.
Although manufacturers have been trying to improve battery performance and put more batteries into electric vehicles, they are also committed to improving higher quality Battery management system (BMS). This is a device specifically designed to extract as much energy as possible from battery packs. They also provide other benefits, including ensuring battery safety by preventing damage to extend battery life and preventing explosions.
BMS is essentially the brain of an EV battery, which manages charging, discharging, and output during the battery's lifespan. They also monitor each battery and its module separately to optimize performance and prevent damage. Throughout the entire battery life, the vehicle's charging range is also monitored and managed by the BMS.
A new wireless BMS solution has been developed, demonstrating the first concept including independent assessment of Functional safety. This is achieved through a highly futuristic wireless protocol with the highest quality network availability in the electric vehicle industry. This solution will enable electric Automotive design designers to reduce the use of expensive, cumbersome and frequently maintained cables, and improve the efficiency and reliability of electric vehicles worldwide.
This new wireless BMS solution makes it possible to reduce vehicle weight, simplify design, and improve reliability. These changes can expand the driving range, accelerate production speed, and improve design flexibility. Texas Instruments provides comprehensive solutions, including software, wireless 2.4GHzSimpleLinkCC2662R-Q1 microcontroller (MCU) evaluation module, and some safety contributing factors, such as fault mode and impact diagnosis analysis (FMEDA), fault mode and impact analysis (FMEA), Functional safety manual, T ∨ VS ∨ D concept report, etc. Here, the motto is "More miles, fewer wires
The adoption of wireless BMS will become increasingly common in the EV industry, as these upgrades provide greater design flexibility, lower cost, and complexity compared to traditional alternatives. This will eventually become a new benchmark in the industry, assuming that these advantages can become compliant with the Safety integrity level (ASIL) d.
Safety testing
In order to shorten the development time of vehicle manufacturers, the industry authority Functional safety authority T ∨ V South Deutsche Group is invited to analyze and evaluate the qualitative and quantitative performance of error detection. The assessment also assessed the ability of automobile manufacturers to use the wireless BMS Functional safety concept to meet ASIL-D, which is regarded as the highest level of International Organization for Standardization (ISO) 26262 certification.
The new wireless system has an upgraded wireless protocol designed specifically for use with BMS. Therefore, it meets communication security and detection requirements. Through wireless MCU (CC2662R-Q1) media, custom protocols allow for scalable and robust data exchange between the new BQ79616-Q1 battery balancer and monitor and host system processors.
The wireless protocol proposed for BMS provides industry-leading network availability, which can actually be compared to wired connections. It is said that its network restart speed can reach up to 300 milliseconds, and network availability exceeds 99.99%. The wireless MCU can also prevent Data corruption or loss by allowing dedicated time slots with low latency and high throughput. In addition, it also provides the opportunity for multiple battery cells to send temperature data and voltage to the main MCU with an accuracy of 2mV and a network packaging error below 10-7. Security enablers will allow car manufacturers to reduce potential security issues, using debug security, key updates and exchanges, software IP protection, unique device authentication, message integrity checks, and Advanced Encryption Standard (AES).
Reliable and scalable technology
Looking forward to the long-term demand from car manufacturers, this new wireless BMS technology is the most scalable among similar products in the industry. It achieves the highest throughput in the market, allowing manufacturers to create battery module cell systems using only one wireless on-chip system and several battery monitors tailored for different versions such as 32, 48, and 60 (BQ79616-Q1). The system is said to be able to handle up to 100 nodes while providing industry low latency rates (less than 2 milliseconds per node) and measurement of time synchronization across each node. Daisy chains and isolation components are no longer needed, as the wireless MCU (CC2662R-Q1) ensures isolation of all individual battery monitoring units. The battery balancer and monitor (BQ79616-Q1) offer multiple channel options in one package.