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Loans (Details) - USD ($) |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Oct. 15, 2019 | Oct. 14, 2019 | Jun. 04, 2018 | Mar. 31, 2021 | Jun. 28, 2020 | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
Loans (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Description of loans |  |  | the Company entered into a cancellation agreement with Mr. Shangdong Liu, Mr. Shibin Mao, Ms. Lijuan Wang and Mr. Ping Shen (the creditors). Pursuant to the terms of the cancellation agreement, Mr. Shangdong Liu, Mr. Shibin Mao, Ms. Lijuan Wang and Mr. Ping Shen agreed to cancel and convert the Fifth Debt (note 1) and the Unpaid Earnest Money in exchange for 528,053, 3,536,068, 2,267,798 and 2,267,798 shares of common stock of the Company, respectively, at an exchange price of $0.6 per share. Upon receipt of the shares, the creditors will release the Company from any claims, demands and other obligations relating to the Fifth Debt and the Unpaid Earnest Money. |  |  |  |  |  |  |
Banking facilities amount |  |  |  |  | $ 4,900,000 |  | $ 4,900,000 |  |  |
Interest amount |  |  |  |  |  |  | 213,583 |  | $ 397,206 |
Agreement Description |  |  |  |  |  |  |  |  |  | In 2019, according to the investment agreements and agreed by the investors, the Company returned partial earnest money of $966,579 (approximately RMB6.7 million) to these investors.
Remained outstanding amount |  |  |  |  |  |  | $ 92,105 |  |  |
Loan agreement description |  |  |  |  |  |  | Nanjing CBAK entered into a loan agreement with Shen Zhen Asian Plastics Technology Co., Ltd (SZ Asian Plastics), to loan SZ Asian Plastics a total amount of $1.4 million (RMB8,870,000) for a period of 6 months from December 1, 2020 to May 31, 2021. The loan is unsecured and bears fixed interest at 6% per annum. The Company’s shareholder Mr. Jiping Zhao, holding 2.39% equity interest in the Company, at the same time held 79.13% equity interests in SZ Asian Plastics. In March 2021, SZ Asian Plastics has fully repaid the loan principal. |  |  |
Interest amount |  |  |  |  |  |  | $ 2,314 |  | $ 154,976 |
China Everbright Bank Dalian Branch [Member] |  |  |  |  |  |  |  |  |  |
Loans (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Description of loans |  |  |  | the Company obtained banking facilities from China Everbright Bank Dalian Branch with a maximum amount of RMB200 million (approximately $30.63 million) bearing interest at 130% of benchmark rate of the People’s Bank of China (“PBOC”) for three-year long-term loans with the term from June 12, 2018 to June 10, 2021, at current rate 6.175% per annum. The facilities were secured by the Company’s land use rights, buildings, machinery and equipment. According to the original repayment schedule, the loans are repayable in six installments of RMB0.8 million ($0.12 million) on December 10, 2018, RMB24.3 million ($3.72 million) on June 10, 2019, RMB0.8 million ($0.12 million) on December 10, 2019, RMB74.7 million ($11.44 million) on June 10, 2020, RMB0.8 million ($0.12 million) on December 10, 2020 and RMB66.3 million ($10.16 million) on June 10, 2021. The Company repaid the bank loan of RMB0.8 million ($0.12 million), RMB24.3 million ($3.72 million) and RMB0.8 million ($0.12 million) in December 2018, June 2019 and December 2019, respectively. |  |  |  |  |  |
China Everbright Bank Dalian Branch [Member] |  |  |  |  |  |  |  |  |  |
Loans (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Description of loans |  |  |  |  |  | the Company entered into a supplemental agreement with China Everbright Bank Dalian Branch to change the repayment schedule. According to the modification agreement, the remaining RMB141.8 million (approximately $21.72 million) loans are repayable in eight instalments consisting of RMB1.09 million ($0.17 million) on June 10, 2020, RMB1 million ($0.15 million) on December 10, 2020, RMB2 million ($0.31 million) on January 10, 2021, RMB2 million ($0.31 million) on February 10, 2021, RMB2 million ($0.31 million) on March 10, 2021, RMB2 million ($0.31 million) on April 10, 2021, RMB2 million ($0.31 million) on May 10, 2021, and RMB129.7 million ($19.9 million) on June 10, 2021, respectively. The Company repaid the bank loan of RMB1.09 million ($0.17 million) and RMB51 million ($7.8 million) in June and December 2020, respectively |  |  |  |
Description of facilities |  |  |  |  |  |  | outstanding loan balance owing to China Everbright Bank Dalian Branch was RMB89.7 million (approximately $13.7 million). The Company repaid RMB50 million ($7.63 million) and RMB39.7 million ($6.07 million) in April and May 2021 to the bank, respectively. |  |  |
Description of bills payable |  | the Company borrowed a total of RMB28 million (approximately $4.12 million) in the form of bills payable from China Everbright Bank Dalian Branch for a term until October 15, 2020, which was secured by the Company’s cash totaled RMB28 million (approximately $4.12 million). The Company discounted the bills payable of even date to China Everbright Bank at a rate of 3.3%. The Company repaid the bills on October 15, 2020. |  |  |  |  |  |  |  |
China Merchants Bank [Member] |  |  |  |  |  |  |  |  |  |
Loans (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Description of bills |  |  |  |  |  |  |  | In October to December 2020, the Company borrowed a series of acceptance bills from China Merchants Bank totaled RMB13.5 million (approximately $2.07 million) for various terms through April to June 2021, which was secured by the Company’s cash totaled RMB13.5 million (approximately $2.07 million) (Note 2). |  |
Agricultural Bank of China [Member] |  |  |  |  |  |  |  |  |  |
Loans (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Description of bills |  |  |  |  | In December 2020 to March 2021, the Company borrowed a series of acceptance bills from Agricultural Bank of China totaled RMB65.2 million (approximately $9.94 million) for various terms to June to September 2021, which was secured by the Company’s cash totaled RMB65.2 million (approximately $9.94 million) (Note 2). |  |  |  |  |
China Zheshang Bank Co Ltd [Member] |  |  |  |  |  |  |  |  |  |
Loans (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Description of bills |  |  |  |  |  |  | Ltd Shenyang Branch totaled RMB28.0 million (approximately $4.27 million) for various terms to July to September 2021, which was secured by the Company’s cash totaled RMB28.0 million (approximately $4.27 million) (Note 2). |  |  |
Suzhou Zhengyuanwei Needle Ce Co., Ltd [Member] |  |  |  |  |  |  |  |  |  |
Loans (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Loan agreement description | Company entered into a short term loan agreement with Suzhou Zhengyuanwei Needle Ce Co., Ltd, an unrelated party to loan RMB0.6 million (approximately $0.1 million), bearing annual interest rate of 12%. As of March 31, 2021, loan amount of RMB0.5 million ($76,303) remained outstanding. |  |  |  |  |  |  |  |  |
China Everbright Bank Dalian Friendship Branch [Member] |  |  |  |  |  |  |  |  |  |
Loans (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Description of bills | In December 2019, the Company obtained banking facilities from China Everbright Bank Dalian Friendship Branch totaled RMB39.9 million (approximately $6.1 million) for a term until November 6, 2020, bearing interest at 5.655% per annum. The facility was secured by 100% equity in CBAK Power held by BAK Asia and buildings of Hubei BAK Real Estate Co., Ltd., which Mr. Yunfei Li (“Mr. Li”), the Company’s CEO holding 15% equity interest. The Company repaid the bank loan of RMB39.9 million (approximately $6.1 million) in December 2020. |  |  |  |  |  |  |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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