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Payables to former subsidiaries, net (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Payables to former subsidiaries $ 1,483,352 $ 4,301,646
BAK Tianjin [Member]    
Payables to former subsidiaries 972,913
BAK Shenzhen [Member]    
Payables to former subsidiaries $ 1,483,352 $ 3,328,733