Method for Producing a Reference Electrode, Accumulator and System

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This invention covers a method for making a reference electrode for rechargeable batteries, where a slurry of active material, electrically conductive material, and binder is dried for at least 12 hours to form the electrode. The resulting reference electrode is cylindrical in shape and contains a metal wire at its core acting as a current collector. The electrode is integrated into a battery alongside an anode, cathode, and electrolyte, and is connected to a battery management system (BMS) that uses the reference electrode's readings to monitor or control battery operation.

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• Lithium-ion battery packs in electric vehicles, where the reference electrode enables precise, real-time monitoring of individual electrode potentials to improve safety and performance.
• Stationary energy storage systems (e.g., grid-scale battery banks) where the BMS uses the reference electrode to detect early signs of degradation or lithium plating.
• Battery research and development laboratories that require stable, reproducible in-situ reference electrodes to characterize anode and cathode behavior independently.
• Consumer electronics battery modules where tighter BMS control enabled by the reference electrode extends cycle life and prevents overcharge or over-discharge.
• Quality control processes in battery manufacturing, using the reference electrode to validate electrode performance during production testing.

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• The extended drying time of at least 12 hours produces a more homogeneous and mechanically stable electrode, reducing defects compared to shorter drying processes.
• The cylindrical geometry with an internal metal wire current collector ensures low internal resistance and uniform current distribution within the reference electrode.
• Integrating the reference electrode directly into the battery cell allows independent measurement of anode and cathode potentials, providing more diagnostic detail than a simple cell-voltage measurement.
• Coupling the reference electrode to a battery management system enables proactive control decisions—such as preventing lithium plating—that improve battery safety and longevity.
• The use of standard slurry components (active material, conductive additive, binder) makes the manufacturing process compatible with existing battery electrode production lines, lowering implementation costs.

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Patent Abstract

The invention relates to a method for producing a reference electrode (1), wherein a slurry (6) containing active material, electrically conductive material and binder for producing the electrode is dried for at least 12 hours. The invention relates to an accumulator with an anode (16), a cathode (17), an electrolyte and a reference electrode (1), wherein the reference electrode (1) is cylindrical in shape and is formed from active material, electrically conductive material and binder and comprises inside a metal wire (2) as a current collector. The invention relates to a system with the accumulator and a battery management system that controls or monitors in dependence on the reference electrode.