White PaperMaterials
Dual Seal Method for the Hermetic Sealing of Microbatteries
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An adhesive for hermetically sealing batteries must resist chemicals, temperature, pressure, and electricity while ensuring minimal outgassing, low moisture permeability, high adhesion to packaging materials, and compatibility with the battery's electrolyte. Its rheological properties must support a continuous, impermeable seal and maintain integrity across temperature variations, with a thermal expansion coefficient aligned with the battery casing. Learn more about adhesive requirements and challenges for microbattery sealing in this white paper.
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Overview
The white paper titled "Dual Seal Method for the Hermetic Sealing of Microbatteries" discusses the advancements in microelectronics driven by Moore's Law, which has led to the miniaturization of integrated circuits (ICs) and the increasing demand for high-energy-density micro-scale batteries. These batteries are essential for powering miniaturized sensors and devices in various fields, including the Internet of Things (IoT), medical applications, and environmental monitoring.
The paper highlights the unique challenges faced in the design and construction of hermetic packaging for microbatteries, which are typically in the millimeter or centimeter range. As the size of these batteries decreases, their power demands increase, necessitating higher operating frequencies and improved energy efficiency. The authors emphasize the importance of maintaining a high energy density while minimizing the weight of the packaging to ensure the feasibility of these small devices.
A key focus of the paper is the dual-seal approach utilized in constructing microbatteries. This method combines a neoprene gasket with a two-component epoxy adhesive, which provides a robust hermetic seal essential for protecting sensitive components from environmental factors. The paper cites research from the Pacific Northwest National Laboratory (PNNL), which demonstrated the effectiveness of this dual-seal method in a prototype microbattery that exhibited impressive energy density metrics.
Additionally, the white paper discusses the significance of using lightweight epoxy adhesives with tailored rheology and flow profiles to facilitate the construction of these devices while ensuring a seamless interface with the metal surfaces being bonded. The integrity of the hermetic seal is critical, as any gaps can compromise the performance and reliability of the microbattery.
Overall, the white paper provides valuable insights into the innovative approaches being developed to address the challenges of hermetic sealing in microbattery technology, paving the way for the next generation of autonomous, self-powered devices.