Autosilicon has launched a new 24-channel Battery Diagnosis IC (BDIC) for high-capacity battery cells in electric vehicles (EVs and storage systems.
Autosilicon’s BDIC aims to improve the operating current, measurement accuracy, and volume compared to Electro-Impedance Spectroscopy (EIS) equipment — replacing multiple devices with a single chip. It allows measurement of AC impedance in up to 24 battery cells and is expandable to battery modules and packs.
In the recent EV industry, battery defects are a concern. However, accurate analysis faces challenges in identifying defect causes due to technical limitations and the high costs and time-consuming of battery-pack disassembly.
The integration of BDIC into a battery management system (BMS) enables online monitoring of battery ac impedance information, allowing continuous tracking of shipped battery cells and online analysis of accumulated battery data. BDIC aids in battery defect analysis, expanding to the examination of specific substances within the battery. With EIS technology, new standards will be set for the accurate detection of defective batteries.
Additionally, ac impedance measurement in hydrogen fuel cells enables the assessment and diagnosis of the internal condition, supporting cost-effective repairs and replacement of fuel cell battery stacks.
From 2026, certain US states will enforce regulations requiring EV manufacturers to monitor and ensure the state-of-health (SoH) of their batteries. EU plans to introduce a battery passport system in 2027 for managing battery information, electrochemical performance, durability, and SoH.
In response, Autosilicon is adopting EIS technology to gather more internal state data from battery cells. It has also developed an algorithm and software to measure the internal temperature of every individual cell using BDIC, a challenging achievment with the conventional NTC temperature sensor.
The release of BDIC enables online integration to the system, building Cloud BMS, and efficient battery management throughout the entire lifecycle for various purposes. The mass production of Autosilicon’s 24-channel BDIC is is scheduled to begin in June 2024.
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