Analytical modeling of A segmented bimorph lithium ion battery actuator

Cody Gonzalez, Shuhua Shan, Mary Frecker, Christopher Rahn

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Silicon composite anode-based lithium ion battery actuators have strong potential for large actuation strain, complex shape change, and large compliance tunability. This allows for actuators with potential to do work with no energy expenditure beyond parasitic losses to internal resistance. This paper studies a segmented bimorph actuator comprised of a silicon-based composite anode double-side coated on copper foil. The bimorph design allows for a nearly 360o range of motion in transverse bending and can double the capacity of the battery in comparison to a single side coated unimorph design. An Euler-Bernoulli model is developed to predict free deflection for a range of geometric configurations and states of charge of the bimorph. By modeling the charging of both active sides of the bimorph simultaneously, it is possible to achieve zero bending while still accommodating for the volumetric expansion of the silicon. The bimorph is able to achieve actuation in one given direction by charging each anode coating separately or maintaining a charge difference between the two coatings. The former method allows for the accommodated volumetric expansion of silicon while maintaining zero bending as in a conventional battery setup. The latter method allows for larger battery capacity and range of motion for a novel electrochemically-based actuation mechanism.

Original languageEnglish (US)
Title of host publicationASME 2020 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, SMASIS 2020
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791884027
DOIs
StatePublished - 2020
EventASME 2020 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, SMASIS 2020 - Virtual, Online
Duration: Sep 15 2020 → …

Publication series

NameASME 2020 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, SMASIS 2020

Conference

ConferenceASME 2020 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, SMASIS 2020
CityVirtual, Online
Period9/15/20 → …

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Biomaterials

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