Thai Citizen

You do not need any kind of visa because your journey is covered by 24 hour visa free transit. You will just transfer from one to another flight in Shanghai and you will just remain within transit area. You do not need to accomplish any formality. Your passport will be perfectly fine along with your boarding pass. This is the case if you are flying on a single (through) ticket. If you are flying on separate tickets, then you will have to approach transit counter (desk), apply for a temporary entry permit, collect your luggage, cross immigration, perform new check-in and again cross immigration and reach your gate... I am more than aware that you fly on a single ticket, so your is the case number one.