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Concentrations and Credit Risk (Details 2) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Supplier A [Member] |  |  |  |
Net purchase | $ 12,396,483 |  |  | [1]
Concentration risk, percentage of net purchase | 48.90% |  |  | [1]
Supplier B [Member] |  |  |  |
Net purchase |  | [1] | $ 2,920,966 |
Concentration risk, percentage of net purchase |  | [1] | 21.40% |
Zhengzhou BAK New Energy Vehicle Co., Ltd [Member] |  |  |  |
Net purchase |  | [1],[2] | $ 3,812,819 | [3]
Concentration risk, percentage of net purchase |  | [1],[2] | 27.93% | [3]
Shenzhen BAK [Member] |  |  |  |
Net purchase | $ 3,884,309 | [4] |  | [1]
Concentration risk, percentage of net purchase | 15.32% | [4] |  | [1]
[1] | Comprised less than 10% of net purchase for the respective period.
[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. Up to the date of this report, Zhengzhou BAK New Energy Technology Co., Ltd repaid $741,353 to the Company.
[3] | 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.
[4] | Mr. Xiangqian Li is a director of Shenzhen BAK and BAK Shenzhen.

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- Definition Amount of increase from purchase of net investment in sales-type and direct financing leases. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 11 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919244-210447 + Details
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