## 5 Conclusions  
The measurements indicate that the application of thermographic observation of the examined objects allows for extending the assessment of their condition (quality). An additional evaluation of temperature fields of the tested sample allows to obtain information about inside processes and, on the basis of analysis of the thermographic data, to gather information about its current condition. One of the basic parameters that was used to determine the condition of a given object is the maximum temperature increment. The assessment based on temperature increment can be carried out on both levels: the producer and the end user, and it does not require the use of particularly specialized equipment. The obtained thermal parameters indicate that while operating with the nominal values of currents and voltages, the samples are characterized by maximum temperature increments (\(\Delta T_{Max}\)) of 5 \({}^{\circ}\)C. On the other hand, obtained records of temperature increments of up to 15 \({}^{\circ}\)C with currents and voltages above the rated values showed no changes in the electrical parameters of the supercapacitors  
Figure 16: Graphic display of standard deviation changes for: (**a**) test parameters \(U=2.7\) V and \(I=500\) mA; (**b**) test parameters \(U=2.7\) V and current \(I=1400\) mA. Figure 17: (**a**) Image of sum of temperatures (\(\Sigma T\)); (**b**) Image of the coefficient of variation (\(CV\)). that were tested up to 3000 cycles (about eight days for \(U=3.3\) V and \(I=2800\) mA). On the other hand, in case of recording temperature increments above 20 \({}^{\circ}\)C, it can be assumed that the observed element changes its parameters. The recorded changes occurred abruptly only when the nominal values were exceeded. Additionally, it should be noted that tested supercapacitors showed significant changes in their parameters only when working with voltages and currents that were significantly exceeding nominal values. In tested samples, only the increase of both voltage and current caused the change of parameters. According to the author, supercapacitors are less resistant to changes in voltage than to changes in current. The research results show that the voltage change over \(\sim\)+30% and the current change \(\sim\)+120% above the nominal value caused changes in electrical parameters after about 700 cycles (after about 2 h of testing). At the same time, tests with voltages above \(\sim\)+20% and currents \(\sim\)+100% exceeding the nominal value in the period after about 3000 cycles (after about eight days) showed no changes in electrical parameters. The conducted verification of the proposed methodology has shown that thermographic measurements, despite the lower accuracy of the measurement than the calorimetric tests, have the additional ability to show the distribution of the temperature field and its fluctuation in the form of graphical distribution on the observed surface. What is more, there is an additional possibility for observing changes in the temperature field on a regular basis during the conducted research and with the possibility of further interpretation and analysis (off-line). The proposed methodology research with the use of thermography seems to be useful particularly in the field of research and development works focusing on supercapacitors. At the same time, the assumed sum of temperatures (\(\Sigma T\)), which was used in the graphic representation of the observed surface, allows the indication of the area in which the most intensified heat generation occurs and to indicate the areas of heat generation during the test. Additionally, the measurements show that the proposed coefficient of variation (\(CV\)), which is used to support the graphical analysis of the results by indicating areas with the highest variability of the processes occurring on the observed surface, provides similar information such as the sum temperature (\(\Sigma T\)) coefficient. It points the area where the temperature increment occurs over the entire observed period.