A Low-Cost Programmable High-Frequency AC Electronic Load with Energy Recycling for Battery Module Diagnostics

Round 1

Reviewer 1 Report

The introduction is too long. Interested readers know about electric vehicles and their general problems with batteries.

The "class E topology" is said to consist "of two inductors, two capacitors, and one power switch". Those elements can not all be found in figure 2 and the following circuit diagrams.

I can not see, where the energy drawn from the battery module is recycled to. In the description of your apparatus there is no energy sink or connection to any energy grid to transfer the energy to.

 

Author Response

"Please see the attachment."

Author Response File: Author Response.docx

Reviewer 2 Report

ear Sirs,

Please find bellow my comments about your paper.

This paper describes a programmable high frequency electronic load for battery diagnostic; it comprises a resonant circuit, a MCU to control signal, and an HMI. This circuit can recycle the energy used to test a battery (here a 6S1P 18650 cells with 2.5 Ah capacity). Technic used to characterize battery look like electrochemical impedance spectroscopy, but, with only one frequency measurement. Nevertheless, it is unfortunate that there are no results about measurement on battery response like voltage of each battery, temperature, and impedance measurement results at 38.6 kHz. In addition, battery characterisation don't need continuous measurement as a function of time, and a punctual offline measurement can be sufficient (if not a book-keeping online voltage, current and temperature measurement). Thus, recycling energy may not be relevant for battery characterization (very few energy to be recycled).

I have also some suggestions :

On the introduction, can you write a part about the “battery module diagnostics”

L311, to accurately measure an energy, you need current integration but also battery voltage (P=U.I) and a battery have is own internal resistance (even if it’s low)

Figs 11 and 12 are too tiny with too much information

Fig 13 needs some units (graphics and integration values)

 

Regards

Author Response

"Please see the attachment."

Author Response File: Author Response.docx

Round 2

Reviewer 2 Report

Dear Sirs,

Thank you ta have taken into account my comments, however, i remain puzzled about the relevantness of this kind of system as a SOC/SOH diagnostic tool for batteries (it is already difficult to diagnose batteries characteritics with a full EIS strectrum, to with just a scalar value, you can only do some comparisons between batteries).

to be more relevant, you can do some tests with batteries at differents SOCs, temperatures, and maybe SOH, and comparison could be better (maybe for an other article)

Regards.