Shocking : Cell phone Battery blast kills youth in China

Just refreshed my feeds and got this shocking news on brietbart.com

Quoting from the Article :

A 22-year-old Welder In North-western China Died When His Cell Phone Battery Exploded As He Was Working In Hot Temperature.

The Battery Exploded While The Phone Was In The Man’s Pocket As He Was Welding At A Factory In Shuangcheng In Jinta County In Gansu Province, The Lanzhou Chenbao Reported, Adding That The Death Was Believed To Be The First In China Caused By A Cell Phone Battery.

The June 19 Blast Broke A Rib And Drove It Into The Man’s Heart And He Collapsed In A Pool Of Blood, The Report Said. He Was Taken To Hospital But Died There.

The Manufacturer Of The Phone Was Notified And Dispatched Experts To Jinta To Conduct An Investigation

Gosh !!! I have heard that we should not use the cell phones at higher temperature, but that could result something like this , I was totally unaware of. Even though the person was welding at a factory , I doubt that temperature could be so high to exceed the sustainability of a battery . So is temperature could be the only cause ?? Or the quality of the battery ??( Chinese )
I have checked my nokia phone , even though its finland made, the battery label states “Made in China”.
Anyway prevention is better and hence avoid taking your phone at high temperature places.