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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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Some materials may easily let electrical charges pass through them, while others obstruct their flow. The former are called conductors and the latter insulators. The atomic structures of materials determine whether they are conductors or insulators of electricity.
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Author Spotlight: Optimization of Airflow Velocities in Battery Cooling Systems for Enhanced Thermal Performance and Reduced Energy Consumption
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Highly Stable Battery Pack via Insulated, Reinforced, Buckling-Enabled Interconnect Array.

Lu Yin1, Joon Kyo Seo1, Jonas Kurniawan1

  • 1Department of Nanoengineering, University of California San Diego, 9500 Gilman Dr, La Jolla, CA, 92093, USA.

Small (Weinheim an Der Bergstrasse, Germany)
|July 5, 2018
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Summary

Researchers developed a flexible and stretchable battery pack using printable inks and serpentine interconnects. This innovative design maintains stable performance even under 100% stretching, ideal for wearable devices.

Keywords:
island-bridgescreen-printingstretchabletextile-basedwearable electronics

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Energy Storage

Background:

  • Traditional batteries are rigid and prone to failure under mechanical stress.
  • Wearable electronics require flexible and durable power sources.
  • Integrating power sources into wearable devices presents significant engineering challenges.

Purpose of the Study:

  • To develop a flexible and stretchable battery pack with high mechanical stability.
  • To demonstrate a novel screen-printing method for creating stretchable energy storage devices.
  • To validate the performance of the battery pack under large deformations for wearable applications.

Main Methods:

  • Utilizing stress-enduring printable inks and serpentine interconnects for battery pack fabrication.
  • Assembling coin-cell lithium-ion batteries onto a screen-printed island-bridge array.
  • Reinforcing the array with polymer and backbone layers to accommodate strain.
  • Testing the battery pack's performance under various deformation levels up to 100% biaxial stretching.

Main Results:

  • The flexible and stretchable battery pack demonstrated highly stable performance with less than 2.5% change under all tested deformation levels.
  • A light-emitting diode band powered by the battery pack showed uninterrupted illumination during on-body testing, irrespective of deformation.
  • The fabrication method allows for the integration of other electronic components, such as sensors and integrated circuits, onto the same platform.

Conclusions:

  • The developed screen-printing route offers a viable method for creating flexible, stretchable energy storage devices from rigid battery units.
  • The battery pack configuration is robust and maintains performance under significant mechanical strain, suitable for demanding wearable applications.
  • This technology holds substantial promise for advancing the design and functionality of diverse wearable electronic systems.