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Concentrations and Credit Risk (Details 4) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sales of finished goods and raw materials $ 37,566,152 $ 22,194,348
BAK Shenzhen [Member]    
Purchase of inventories [1] 63,950
Sales of finished goods and raw materials [1] 526,719
Zhengzhou BAK New Energy Technology Co., Ltd [Member]    
Sales of finished goods and raw materials [2] $ 1,562,637
[1] Mr. Xiangqian Li is a director of Shenzhen BAK and BAK Shenzhen.
[2] Mr. Xiangqian Li is a director of Zhengzhou BAK New Energy Vehicle Co., Ltd, which has 29% equity interests in Zhengzhou BAK New Energy Technology Co., Ltd. As of December 31, 2019 and 2020, receivable from Zhengzhou BAK New Energy Technology Co., Ltd were nil and $1,759,050, respectively, was included in trade accounts and bills receivable, net, Up to the date of this report, Zhengzhou BAK New Energy Technology Co., Ltd repaid $741,353 to the Company.