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Payables to former subsidiaries, net (Tables)
12 Months Ended
Dec. 31, 2019
Payables to Former Subsidiaries Net [Abstract]  
Schedule of payable to a former subsidiary

   December 31,   December 31, 
   2018   2019 
BAK Tianjin  $972,913   $- 
BAK Shenzhen   3,328,733    1,483,352 
   $4,301,646   $1,483,352