Viscoelastic constitutive parameter identification and thermodynamic state analysis method for silicon-carbon negative electrode lithium battery

The invention relates to the technical field of lithium battery state analysis, discloses a viscoelastic constitutive parameter identification and thermodynamic state analysis method for a silicon-carbon negative electrode lithium battery, and aims to solve the problems of mechanical modeling and thermodynamic state online evaluation of the silicon-carbon negative electrode lithium battery in a service process. According to the constitutive parameter identification method, the pressure/deformation test and the viscoelastic constitutive model are combined, and the constitutive parameters of the silicon-carbon negative electrode lithium battery are accurately identified through a reverse calculation method. According to the thermodynamic state analysis method, cyclic deformation, charge deformation, thermal deformation and mechanical deformation in a general assembly state are considered, and a mechanical/thermal analysis model of the silicon-carbon negative electrode lithium battery under charging and discharg