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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.

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