Battery Degradation Evaluation via Temperature-Corrected State Quantities

The patent transforms raw state quantities into corrected evaluation indices by applying temperature correction coefficients and usage time corrections. This parameter transformation approach converts temperature-dependent voltage and resistance values into standardized degradation indicators that can be accurately compared across different operating conditions, resolving the contradiction between simple evaluation processes and accurate degradation assessment.

The patent pre-calculates and stores temperature correction coefficients in a lookup table before actual degradation evaluation. During operation, the system simply retrieves the appropriate correction coefficient based on measured temperature and applies it to the state quantities, rather than performing complex real-time calculations. This preliminary preparation approach maintains high evaluation accuracy while minimizing processing complexity during actual use.

The patent applies correction selectively only to state quantities that exhibit correlation with temperature variations. The system evaluates each state quantity individually, applying correction coefficients only where needed based on correlation analysis, rather than uniformly correcting all measurements. This localized correction approach maintains accuracy for temperature-sensitive parameters while avoiding unnecessary processing time for temperature-independent parameters.