Subaru. has developed a cell balancing method for electric vehicles with lithium-ion batteries. The method adjusts the state of charge of each cell based on predicted standing time and capacity retention rates, ensuring optimal performance. This innovation aims to enhance battery efficiency and longevity in electric vehicles. GlobalData’s report on Subaru gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData’s company profile on Subaru, Battery management systems was a key innovation area identified from patents. Subaru's grant share as of January 2024 was 62%. Grant share is based on the ratio of number of grants to total number of patents.

Cell balancing method for lithium-ion battery in electric vehicles

Source: United States Patent and Trademark Office (USPTO). Credit: Subaru Corp

The patent application (Publication Number: US20240034193A1) describes a cell balancing method and system for use in electric vehicles equipped with lithium-ion batteries. The method involves adjusting the state of charge of each cell in the battery based on predicted standing time, capacity retention rate estimation, and state-of-charge adjustment values. The predicted standing time is determined by analyzing historical data, while the capacity retention rate is estimated using temperature measurements, state of charge, and deterioration factors during vehicle stoppage. If the difference in capacity retention rates exceeds a threshold, state-of-charge adjustment values are set to maintain balance. The system includes devices for temperature and state-of-charge determination, along with processors for data transmission and processing to implement the cell balancing method effectively.

Furthermore, the system's processors are responsible for setting predicted standing time, estimating capacity retention rates, and determining state-of-charge adjustment values based on the collected data. The temperature determination device measures or estimates cell temperatures, while the state-of-charge determination device assesses the state of charge for each cell. The state-of-charge adjustment device then adjusts the state of charge as needed to maintain balance. By utilizing historical data and real-time measurements, the system ensures efficient cell balancing to optimize battery performance and longevity in electric vehicles. The method and system outlined in the patent application offer a comprehensive approach to managing cell health and performance in lithium-ion batteries, enhancing the overall efficiency and reliability of electric vehicle power sources.

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