With the assembly lines distributed in South East Asia and East Asia with low quality control , every thing is possible. Actually , yes it exploded regardless of the causes.
Just Google " iphone 7 exploded" , and you will read many articles about this topic. And by way Iphone 8 and on , will start dealing with Samsung OLED screens as a replacement of the current LCD. Deal done in April 2016. "According to the alleged terms of the deal, Samsung Display will supply in the region of 100 million 5.5-inch OLED panels annually, with the value being estimated at $2.59 billion."
http://www.cultofmac.com/423273/apple-reaches-deal-with-samsung-to-buy-oled-iphone-displays/
Hopefully , Apple Fans will not be detracted from always saying " the premium superiority of the Iphone". :)