A Low Cost Flexible Digital Twin Platform for Spacecraft Lithium-ion Battery Pack Degradation Assessment

Lithium-ion battery is widely utilized in space applications with its significant performance advantages. The safety and reliability of lithium-ion battery are critical for spacecraft. It is essential to assess the performance degradation and estimate the state of lithium-ion battery. Meanwhile, as a brand new terminology of Cyber-physical Systems (CPS), the Digital Twin is used in the smart manufacturing and industry due to its advantages on real-time, stability and reliability. Thus, the Digital Twin can be used in lithium-ion battery pack to ensure the real-time, stability and reliability. So far, the Digital Twin has not been used for lithium-ion battery application about management and assessment. As a result, a digital twin platform, which is developed based on low-cost modules and software, is built to assess spacecraft lithium-ion battery pack degradation for the first time in this paper. It is also flexible because it can load different degradation algorithms and be suitable for different types of batteries. Firstly, the overview of the digital twin is introduced. The Visual Software and the Assessment Unit are described in detail. Secondly, the platform test and evaluation is achieved. We test and verify the basic function and core function of the digital twin platform using the real test data of spacecraft lithium-ion battery pack. Testing results prove that the Digital Twin platform can realize the basic function of digital and the degradation assessment for spacecraft lithium-ion battery pack.