A123 Systems has been granted a patent for a battery management system (BMS) with a protection circuit to prevent unexpected switching ON. The system includes a cutoff circuit, reverse bias protection circuit, and driver integrated circuit for vehicle battery systems. GlobalData’s report on A123 Systems 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 A123 Systems, Battery management systems was a key innovation area identified from patents. A123 Systems's grant share as of January 2024 was 53%. Grant share is based on the ratio of number of grants to total number of patents.

Battery management system with reverse bias protection for vehicle batteries

Source: United States Patent and Trademark Office (USPTO). Credit: A123 Systems LLC

The granted patent (Publication Number: US11881707B2) discloses a vehicle battery system comprising a battery management system (BMS) with a cutoff circuit, reverse bias protection circuit, and driver integrated circuit. The system is designed to manage a battery pack with stacked battery cells, where the reverse bias protection circuit prevents electric current flow in response to reverse bias voltage at the output of the cutoff circuit. The BMS is configured to control the flow of electric current through a switchable current path based on the presence or absence of reverse bias voltage, enhancing the safety and efficiency of the battery system.

Furthermore, the patent details the specific components and configurations within the reverse bias protection circuit, including diodes, low-current leakage transistors, and Zener diodes. These components work together to ensure that the voltage across the control input of the cutoff circuit and the output of the cutoff circuit is maintained within safe limits. By utilizing a combination of these elements, the vehicle battery system can effectively manage the flow of electric current, switch ON/OFF states of the cutoff circuit, and reduce collector-emitter voltage to enhance overall performance and safety. This innovative approach to battery management showcases advancements in technology aimed at improving the functionality and reliability of vehicle battery systems.

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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.