Varta has been granted a patent for an electrochemical cell design featuring a cylindrical housing with positive and negative electrodes connected to end faces. A unique contact lug design allows for external electrical connection with a damping section for oscillation. This innovation is particularly suited for button cells. GlobalData’s report on Varta 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 Varta, Hydrogen storage alloys was a key innovation area identified from patents. Varta's grant share as of January 2024 was 58%. Grant share is based on the ratio of number of grants to total number of patents.

Button cell with improved contact lug for electrical connection

Source: United States Patent and Trademark Office (USPTO). Credit: Varta AG

A recently granted patent (Publication Number: US11843133B2) discloses an innovative design for an electrochemical cell, specifically a button cell, housed within a cylindrical casing. The cell comprises a positive and negative electrode connected to the first and second end faces of the housing, respectively, via a contact lug. This contact lug features a unique damping section that allows for free oscillation, enhancing the cell's performance. Additionally, the contact lug extends beyond the end face to which it is fastened, providing improved connectivity.

Furthermore, the patent details various configurations and materials for the contact lug, including sheet metal parts or stamped parts with a thickness ranging from 0.05 to 2.5 mm. The cell is designed for fastening to a circuit board and can be utilized in lithium-ion cells with diameters ranging from 5 mm to 25 mm and heights from 1.5 mm to 15 mm. The second contact-connection section of the lug extends at an angle to the plane of the end face, showcasing versatility in design and application. This patent highlights advancements in electrochemical cell technology, particularly in the construction of button cells, offering improved performance and connectivity in various electronic devices.

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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.

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.