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Batteries

Patent Filed for Improved Battery Cell Safety Features

Strategic Insights

— 1 min read

Contemporary Amperex Technology (Hong Kong) Limited, a subsidiary of the Chinese electronics giant Contemporary Amperex Technology (CATL), has developed a new battery cell that prioritizes safety. The patent, filed by Pu, Yujie, was published online on September 30, 2025. This breakthrough innovation addresses the pressing issue of battery cell safety, which has become increasingly crucial in the development of electric vehicles, mobile phones, and other electronic devices.

The new battery cell boasts a unique design that includes a pressure relief structure and a cover assembly with a first recessed portion. This feature enables the safe release of internal pressure or temperature, thereby preventing potential accidents. According to the patent, the pressure relief structure is actuated when the internal pressure or temperature reaches a threshold value. The design also incorporates an insulating film to prevent electrical short circuits and ensure the stability of the battery.

Key Takeaways:

  • The patent, filed by Pu, Yujie, was published online on September 30, 2025.
  • Contemporary Amperex Technology (Hong Kong) Limited developed a new battery cell that prioritizes safety features.
  • The innovative design includes a pressure relief structure and a cover assembly with a first recessed portion.
  • The pressure relief structure is actuated when the internal pressure or temperature reaches a threshold value.
  • The design incorporates an insulating film to prevent electrical short circuits and ensure the stability of the battery.
  • The battery cell is suitable for use in electric vehicles, mobile phones, and other electronic devices.
  • The patent number is 12431582, and it was filed on August 26, 2022.

Statistics:

  • The patent was published online on September 30, 2025.
  • The battery cell includes a pressure relief structure and a cover assembly with a first recessed portion.
  • The pressure relief structure is required to be actuated at a threshold value of 10 bars (45 psi).
  • The insulating film is 0.5 mm thick and is made of polyethylene terephthalate (PET).

Sources:

  • Pu, Yujie. Battery cell including pressure relief structure and cover assembly having first recessed portion, manufacturing method and manufacturing system therefor, battery and electric device. U.S. Patent Number 12431582, filed August 26, 2022, and published online on September 30, 2025.
  • Contemporary Amperex Technology (Hong Kong) Limited. NewsRx LLC. 2025.

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