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Can I connect a 5w 5w solar panel directly into a 10k mAh portable battery bank safely via USB 2.0, or does it need some sort of protection in-between like a solar charge controller or a schottky diode?
Example of battery bank (except one with usb 2.0 input): https://www.anker.com/ca/products/a1229
Example of solar panel: https://www.aliexpress.com/item/1005006012344670.html
Just cause it has a USB plug doesn'tmeans its regulated output.... I suspect its just welded across the output of the panel...
Would the overcharge protection be handled by the power bank in this case?
Yes it should be fine.
You can measure and the input should become around 5v when charging