**4. Conclusions**

In order to improve the overheating problem caused by the low heat dissipation efficiency of the cooling plate during the operation of a PEMFC, five innovative cooling flow field channel designs are proposed. The heat dissipation capacity of these five flow fields under different working conditions is studied, and the following conclusions are obtained:


**Author Contributions:** Conceptualization, J.S. and Y.H.; Data curation, Y.L.; Funding acquisition, J.S.; Investigation, T.L. and X.Z.; Methodology, J.S. and L.C.; Project administration, J.S.; Software, Z.M.; Validation, Y.L.; Writing—review and editing, J.S. and Y.H. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research was funded by the National Natural Science Foundation of China (Grant No.51805102) and the Guizhou Provincial Natural Science Foundation (Grant No. [2020]1Y238).

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** Not applicable.

**Acknowledgments:** The authors would like to thank the anonymous reviewers and the editor for their valuable comments and suggestions.

**Conflicts of Interest:** The authors declare no conflict of interest.
