Varta has been granted a patent for a method of producing a button cell. The method involves providing a cell cup, a cell top, and an electrode-separator assembly winding. An electrically insulating seal is applied to the cell top casing, and the electrode-separator assembly winding is inserted into the cell top. The cell top is then inserted into the cell cup, and pressure is applied to seal the housing. The patent includes specific details about the construction and dimensions of the components involved in the method. 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 September 2023 was 58%. Grant share is based on the ratio of number of grants to total number of patents.

Method for producing a sealed button cell

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

A recently granted patent (Publication Number: US11735760B2) describes a method for producing a button cell. The method involves several steps, including providing a cell cup with a flat bottom area and a casing, and a cell top with a flat top area and a casing. The cell top casing has a cylindrical portion. An electrode-separator assembly winding is created, consisting of a positive electrode and a negative electrode connected by a separator layer and wound in a spiral shape. The winding is inserted into the cell top, and then the cell top is inserted into the cell cup to form a housing.

To seal the housing, an electrically insulating seal is applied to the outer portion of the cell top casing. A radial pressure is then applied to the cell cup casing to seal the housing. The cylindrical portion of the cell top casing forms part of an overlap area between the cell top casing and the cell cup casing. The height of this overlap area is between 20% and 99% of the height of the cell top casing.

Additional features of the method include the use of a conical subarea in the cell cup casing to facilitate the insertion of the cell top, and the creation of a gap between the cell cup casing and the cell top casing during insertion. The application of radial pressure reduces the width of this gap. The method also involves welding portions of the metallic film or mesh of the electrodes to the flat bottom area or the flat top area.

Overall, this patented method provides a detailed and specific process for producing a button cell, ensuring a secure and effective seal between the cell cup and the cell top. The method incorporates various design features and techniques to optimize the assembly and sealing process.

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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.