Lithium ion battery polycrystal / single crystal positive electrode material multi-physics field coupling modeling and failure analysis method
By constructing a three-dimensional positive electrode particle model and a multi-physical field coupling interface, the problem of unpredictable multi-crystal positive electrode grain boundary block and stress concentration in existing modeling methods is solved, and accurate simulation and performance prediction of the positive electrode materials of lithium-ion batteries are achieved, supporting material optimization and life evaluation.
Patent Information
- Application Number
- CN202510883858.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-30
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2045-06-30
AI Technical Summary
The existing modeling methods are difficult to consider the multi-physical process coupling effect of lithium-ion battery cathode materials at the same time, and cannot accurately predict the cracks and failure paths caused by grain boundary blockage and stress concentration in the polycrystalline positive electrode, and ignore the influence of grain size distribution and orientation differences in the real structure.
A three-dimensional positive electrode particle structure model is constructed, and a polycrystalline structure is generated by randomly filling non-overlapping spherical grains within the spherical boundary. A finite element simulation platform is introduced to set up a multi-physical coupling interface, a lithium ion diffusion, electrolyte migration and electrochemical reaction models are established, and the lithium concentration-strain-stress coupling relationship is solved, and the potential structural damage area is identified.
Multi-physics coupled modeling and simulation are realized, accurately revealing the evolutionary behavior differences between polycrystalline and single-crystalline cathode materials in the electrochemical-mechanical process, providing theoretical basis and simulation tool support for electrode material design, structural optimization and lifetime evaluation.