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Consolidated Statements of Cash Flows | 12 Months Ended
--- | ---
Dec. 31, 2023 CNY (¥) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 CNY (¥)
Cash flows from operating activities: |  |  |  |
Net income (loss) | ¥ (254,352,054) | $ (35,911,736) | ¥ 31,118,886 | ¥ (174,944,484)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |  |
Amortization of right-of-use assets | 5,752,591 | 812,203 | 5,505,422 | 2,920,433
Depreciation and amortization expenses | 4,422,560 | 624,417 | 3,928,131 | 2,609,699
Gain (loss) on lease termination | 113,588 | 16,037 |  | (12,088)
Share-based compensation | 718,411 | 101,432 | 9,347,347 | 19,344
Inventory write-down | 60,767,978 | 8,579,776 | 184,073,191 | 26,753,768
Changes in assets and liabilities: |  |  |  |
Accounts receivable, net | (1,732,378) | (244,593) |  | 1,165,716
Inventories, net | 28,782,243 | 4,063,739 | (71,446,484) | (233,385,726)
Prepayments | 47,159,593 | 6,658,420 | 304,300,103 | (364,369,453)
Other current assets | 511,358 | 72,198 | 51,740,635 | (38,564,595)
Accounts payable | 898,564 | 126,867 | 10,591,202 | 1,937,951
Accounts payable - related party |  |  |  | (4,716,981)
Advance from customers | (16,662,392) | (2,352,548) | (794,302,470) | 851,987,235
Operating lease liabilities, current | (4,349,974) | (614,169) | (5,330,448) | (4,687,184)
Other current liabilities | (5,504,025) | (777,108) | (4,466,304) | 5,019,233
Net cash provided by (used in) operating activities | (133,473,937) | (18,845,065) | (274,940,789) | 71,732,868
Cash flows from investing activities: |  |  |  |
Purchases of property, plant and equipment | (105,482,822) | (14,893,024) | (17,531,162) | (8,692,683)
Refund of prepayment for property, plant and equipment |  |  |  | 550,000
Purchases of short-term investment |  |  |  | (32,293,440)
Proceeds from sales of short-term investments |  |  | 33,640,500 |
Purchases of intangible assets |  |  | (49,292,208) |
Loan provided to a related party |  |  |  | (100,000)
Collection of loan provided to a related party |  |  |  | 4,490,000
Net cash used in investing activities | (105,482,822) | (14,893,024) | (33,182,870) | (36,046,123)
Cash flows from financing activities: |  |  |  |
Repayment to related parties |  |  |  | (31,355,000)
Proceeds from issuance of ordinary shares | 72,802,734 | 10,278,952 | 144,043,186 | 201,199,989
Cash contribution from shareholders |  |  |  | 51,135
Proceeds from bank loans | 128,247,467 | 18,107,144 | 17,093,316 |
Repayments of bank loans | (1,530,000) | (216,019) | (140,000) |
Repayment of loan payable |  |  |  | (5,000,000)
Net cash provided by financing activities | 199,520,201 | 28,170,077 | 160,996,502 | 164,896,124
Effects of exchange rate changes on cash, cash equivalents and restricted cash | 159,828 | 22,566 | 1,132,887 | (2,062,387)
Net increase (decrease) in cash, cash equivalents and restricted cash | (39,276,730) | (5,545,446) | (145,994,270) | 198,520,482
Cash, cash equivalents and restricted cash at beginning of the year | 87,859,384 | 12,404,787 | 233,853,654 | 35,333,172
Cash, cash equivalents and restricted cash at end of the year | 48,582,654 | 6,859,341 | 87,859,384 | 233,853,654
Supplemental cash flow disclosures: |  |  |  |
Interest paid | 3,773,028 | 532,710 | 180,619 |
Income taxes paid |  |  | 89,169 | 276,186
Non-cash investing and financing activities: |  |  |  |
Operating lease right-of-use asset obtained in exchange for operating lease liability | 5,015,808 | 708,177 | 4,557,092 |
Liabilities assumed in connection with purchase of property, plant and equipment | ¥ 46,180,063 | $ 6,520,121 |  |

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