Electrothermal Aging Model of Li-Ion Batteries for Vehicle-to-Grid Services Evaluation
Round 1
Reviewer 1 Report
The topic is interesting but the paper is not smooth and hard to follow. See some of the major issues:
The abstract needs to be re-write. Add some numerical results in the abstract as well
Some typo errors in the paper need to be reviewed.
There are several grammatical mistakes in the paper as well. For example, in the second paragraph of the introduction “However, the impact of the growth of e-mobility on the Electric Grid introduces some 27
issues that is worth to analyze.”
Contributions of the work are not clear. Please add contributions in bolts at the end of the introduction section.
The literature review can be improved. And, should have a proposed section.
The flow of the paper is not clear
It is hard to understand Equations due to the lack of explanation of each equation and variable.
The quality of some figures is poor.
Results can be compared with some benchmarks.
If the paper is accepted, I recommend clarifying the model. I also recommend improving the writing of the paper and avoiding misleading expressions.
Author Response
Thank you for your comments. Please check the attached file for the replies.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
The paper entitled “Electro-Thermal Aging Model of Li-Ion Batteries for Vehicle-to-Grid Services Evaluation” has been submitted by Mauri et al., in the Electronics journal. They propose an Electro-Thermal Aging Model of Li-Ion NMC batteries in order to evaluate Vehicle to Grid (V2G) Services. Some different V2G scenarios are simulated and analyzed. I have the following comments.
The understanding aging phenomenon is one of the main themes of this paper. However, in the introduction section, the authors have not provided enough literature. It is suggested to please enhance the literature associated with this point. While some information from the early sections of the introduction can be reduced.
How did the heat transfer coefficients changes (lines139-140)? Please explain. Also, the authors choose the first-order thermal circuit for this case. Why is it so?
Regarding electrical modeling, please include this study to enhance the scope (A comparative study of controllers for optimal speed control of the hybrid electric vehicle, 10.1109/INTELSE.2016.7475142).
There are many typos and grammatical mistakes throughout the manuscript. Please improve the linguistic errors. Similarly, there is no consistency in the figure’s quality, i.e., axis, fonts, colors, legends. Please check.
Author Response
Thank you for your comments. Please check the attached file for the replies.
Author Response File: Author Response.pdf
Reviewer 3 Report
The article is very compact. But the major issue is with figures some figures are good. But some figures have tiny legends challenging to observe, miniature headings with very fading colors, making it impossible to see the graph correctly at a glance. Also, the curve line width is small, and some dotted curves contain tiny points.
Here are some recommended corrections:
The Authors should mention SOC means what? State of charge!
Figure 4 simulation and experimental curves are not distinguishable. Make it with starkly different colors and a little bit thicker line width.
In figure 7 & Figure 8, the legend is small, making it more visible. The points are also minor and make it larger.
In figure 10, the curves and legends are too small.
Figure 13 can authors make the Arrhenius plot more visible!
In figure 14, the legend is too small.
I would recommend authors present the figures more aesthetically.
Author Response
Thank you for your comments. Please check the attached file for the replies.
Author Response File: Author Response.pdf
Reviewer 4 Report
This is really a novel work, highlighting the essence and possible contributions of Electric vehicles towards solving the current energy demands. The paper looked at the effect of the vehicle to grid on the battery life expectancy considering a NMC battery majorly. The models were really well described and the assumptions for simplification were thoroughly explained. Overall, the paper was well written, however, I have the following concerns:
Line 82-83 - For EVs applications, the automotive industry mainly focuses on the Nickel-Cobalt-Aluminum (NCA, LiNiCoAlO2) and Nickel-Cobalt-Manganese (NMC, LiNixMnyCo1-x-yO2) technology - why? can you put a few details to reason why these two are preferred in the EV and automotive industry
Line 117 correct "mange" to "manage"
Line 127 correct " according the" to "according to the"
Table 2 - Unit for the battery voltage should be put there, so as to be consistent with the Energy column
line 135 - comma after the capacity
line 137 - correct "according the cell position" to "according to the cell position"
Line 139 - correct " according the" to "according to the
Line 146, looking at equation 1, there is no description on how to calculate the temperature using the thermal model
Line 148 - correct " according the" to "according to the
Line 149 - Equation 5 needs to be corrected, the f should be removed
Line 265 - EOL abbreviation was not previously defined, kindly define it and give a brief meaning to it
Line 276 - SOH was not previously defined, define it and give a short description of the term
Line 282 - correct "di-cult" to "difficult"
Between line 322 and 323 - Equation 10 - should be well numbered after equation 9
Equation numbering not consistent, please check
Line 486 - Do you mean "to 48% in the second day"? please check
Author Response
Thank you for your comments. Please check the attached file for the replies.
Author Response File: Author Response.pdf
Reviewer 5 Report
In this paper the authors proposes an Electro-Thermal Aging Model of Li-Ion NMC batteries 13 in order to evaluate Vehicle to Grid (V2G) Services, aslo some different V2G scenarios are simulated and 14 analysed. They found that the battery faces an additional 608 degradation, which is due to the additional cycling performed. The lifetime of the vehicle 609 is reduced of almost two years for the V2G scenario examined, compared to the scenario 610 without V2G. The battery does not face a dramatic reduction of its useful life, considering 611 that the processed Ah charge throughput has almost doubled in the V2G scenario, moving 612 from around 120'000 Ah over 10 years to almost 230'000 Ah over 8 years, but to compen-613 sate this degradation an opportune revenues system is needed and it is necessary a deeper 614 analysis to fix the correct service price.
Author Response
Thank you for your comments. Please check the attached file for the replies.
Author Response File: Author Response.pdf
Reviewer 6 Report
This paper illustrates the electro thermal aging model of Li-Ion batteries with and without VSG evaluation. The results are supported by evidence and the comparison of capacity fade with and without V2G is impressive. Overall, the paper is well written and has significant scientific merit.
some of the minor queries are listed as follows:
- In the introduction section, valid and strong justification should be provided for assuming BMS and TMS as ideal.
- What is the significance of choosing particular battery cell structure and arrangement, are they similar to the battery set-up used by current EVs in the industry?, could the authors please comment on this, if it is not industry sensitive data?
- how would the accuracy of the electrical models would impact the final results, is there any preliminary experimental evidence to support this query?
- please use uniform representation for Li-ion, (some places it is referred as Li-ion and some places Li-Ion)
- correct the typo error in line 282 (difficult)
- Explain the terminology middle SoC , when first used (for general audience to understand.)
- please mark the sub figures as a b c and d in Figures 16, 18 , 19 and 20.
Author Response
Thank you for your comments. Please check the attached file for the replies.
Author Response File: Author Response.pdf
Round 2
Reviewer 1 Report
I'm satisfied with the responses to my comments and I don't have any further comments. However, the quality of the figures is not up to the mark.
Author Response
Thank you for your comments. We have checked the figures. In the original word document, we don’t see any quality problem. We think the problem is in the PDF conversion. We will check with the editor.
Reviewer 2 Report
Ready for publication
Author Response
Thank you for your comments. We have checked the paper to improve the English.
