Assessing the Performance Degradation of Lithium-Ion Batteries Using an Approach Based on Fusion of Multiple Feature Parameters

Figure 4

Variation trends of the 6 features exhibited by battery numbers 5, 6, and 18.

(a) Variation of RMS values with an increase in the number of discharge cycles

(b) Variation of standard deviation values with an increase in the number of discharge cycles

(c) Variation of mean values with an increase in the number of discharge cycles

(d) Variation of kurtosis values with an increase in the number of discharge cycles

(e) Variation of skewness values with an increase in the number of discharge cycles

(f) Variation of fixed-interval voltage difference values with an increase in the number of discharge cycles

(g) Variation of sample entropy values with an increase in the number of discharge cycles