Huawei is now said to launch its inaugural clamshell-style foldable as early as December 2021. A new patent lends more weight to this theory by depicting an innovative new kind of "heat pipe" that looks designed to fit into such a device. It can bend in the middle, thereby potentially lining up nicely with a smaller foldable smartphone's hinge.
https://www.notebookcheck.net/The-Huawei-Mate-V-could-have-a-thermal-management-system-as-foldable-as-its-clamshell-form-factor.582892.0.html