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Patent Filed for Wound Capacitor with Cooling Channel to Enhance Electric Vehicle Performance

Strategic Insights

— 1 min read

A significant breakthrough has been reported in the development of electric vehicle technology, with the patent filing of a wound capacitor featuring a cooling channel that aims to improve the performance of electric vehicles. Robert Nelles, inventor from Stuttgart, Germany, filed the patent on November 18, 2022, which was published online on October 7, 2025. The patent, titled "Wound capacitor, pulse-controlled inverter and motor vehicle," addresses a pressing issue in electric vehicle design - the overheating of conventional capacitors, which hinders the performance improvement of drive systems.

Key Takeaways:

  • The patented wound capacitor features a cooling channel made of electrically non-conductive and thermally conductive materials to enhance heat dissipation.
  • The cooling channel is designed to conduct coolant, which can be a liquid or a water-glycol mixture, to effectively cool the capacitor body and its interior.
  • The capacitor's internal hot spots, which are responsible for performance limitations, can be mitigated using this novel cooling system.
  • The invention aims to improve the efficiency and reliability of electric vehicle systems by minimizing heat-related losses in the DC link capacitor.
  • The patented design comprises a second wound capacitor arranged in series with the primary capacitor, further enhancing the cooling channel's effectiveness.
  • The invention provides a range of benefits, including improved thermal conductivity, reduced power losses, and enhanced overall system performance.

Statistics:

  • The patent was filed on November 18, 2022, and published online on October 7, 2025, with the patent number 12437932.
  • The cooling channel comprises an electrically non-conductive and thermally conductive material, such as a heat-resistant and thermally conductive plastic.
  • The capacitor's interior hot spots can be a significant limitation on performance, with a range of temperatures typically measured: 60°C, 80°C, and 100°C.
  • The cooling channel can dissipate heat effectively, with the coolant temperature maintained within a range of 30°C to 50°C.

Sources:

  • Nelles, Robert. Wound capacitor, pulse-controlled inverter and motor vehicle. U.S. Patent Number 12437932, filed November 18, 2022, and published online on October 7, 2025.
  • Patent URL (for desktop use only): https://ppubs.uspto.gov/pubwebapp/external.html?q=(12437932)&db=USPAT&type=ids

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