v3.26.1
DESCRIPTION OF ORGANIZATION AND PRINCIPAL ACTIVITIES - Group's VIE information (Details)
 12 Months Ended
Dec. 31, 2025
CNY (¥)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2025
USD ($)
Group's VIE information          
Cash and cash equivalents ¥ 924,738,132   ¥ 630,021,303   $ 132,235,794
Term deposits 128,235,695   274,351,895   18,337,460
Restricted cash 210,864,000   216,395,796   30,153,151
Short-term investments 62,661,176       8,960,429
Accounts receivable, net 37,372,044   131,921,419   5,344,131
Inventories 652,579,651   649,177,719   93,317,649
Prepayments and other current assets 343,536,572   267,938,339   49,125,076
Total current assets 2,359,987,270   2,169,806,471   337,473,690
Property, plant and equipment, net 420,173,035   320,013,632   60,083,945
Intangible assets, net 776,328   1,043,801   111,013
Operating lease right-of-use assets 75,954,225   71,223,350   10,861,310
Deferred income tax assets 57,457,432   31,752,254   8,216,303
Other non-current assets 35,988,114   19,318,659   5,146,232
Total assets 2,950,336,404   2,613,158,167   421,892,493
Short-term bank borrowings 240,000,000   200,000,000   34,319,544
Notes payable 394,285,714   294,348,768   56,382,107
Accounts payable 704,089,088   869,015,140   100,683,400
Income taxes payable 2,197,710   1,071,914   314,268
Advances from customers 182,598,444   35,892,860   26,111,230
Deferred revenue-current 75,148,049   50,247,103   10,746,028
Accrued expenses and other current liabilities 404,813,611   201,356,008   57,887,575
Total current liabilities 2,003,132,616   1,651,931,793   286,444,152
Deferred revenue-non-current 23,316,175   16,886,859   3,334,169
Deferred income tax liabilities 2,057,892   3,269,464   294,275
Operating lease liabilities-non-current 3,956,501   89,990   565,772
Other non-current liabilities 12,941,916   9,697,841   1,850,669
Total liabilities 2,045,405,100   1,681,875,947   $ 292,489,037
Revenues 4,307,865,498 $ 616,016,573 3,288,296,344 ¥ 2,651,757,646  
Net Income (Loss) (39,385,588) (5,632,064) (193,200,639) (271,835,982)  
Net cash provided by operating activities 353,270,015 50,516,940 52,286,618 93,735,092  
Net cash provided by (used in) investing activities (90,600,683) (12,955,725) (292,428,847) 216,310,708  
Net cash (used in) provided by financing activities 40,164,587 5,743,460 100,267,335 (59,345,977)  
Effect of foreign currency exchange rate changes on cash, cash equivalents and restricted cash (13,648,886) (1,951,765) 6,051,800 8,913,200  
Net increase (decrease) in cash, cash equivalents and restricted cash 289,185,033 41,352,910 (133,823,094) 259,613,023  
Cash, cash equivalents and restricted cash at the beginning of the year 846,417,099 121,036,035 980,240,193 720,627,170  
Cash, cash equivalents and restricted cash at the end of the year 1,135,602,132 $ 162,388,945 846,417,099 980,240,193  
VIE          
Group's VIE information          
Cash and cash equivalents 758,887,889   543,298,396    
Term deposits 114,178,095   134,178,095    
Restricted cash     376,157    
Short-term investments 20,126,575        
Accounts receivable, net 19,181,215   117,003,716    
Inventories 524,264,388   582,024,734    
Prepayments and other current assets 304,440,726   234,385,266    
Amounts due from inter-companies 317,093,486   213,867,617    
Total current assets 2,058,172,374   1,825,133,981    
Property, plant and equipment, net 418,500,969   318,530,570    
Intangible assets, net 673,040   887,955    
Operating lease right-of-use assets 70,360,147   71,223,350    
Deferred income tax assets 56,203,598   31,752,254    
Other non-current assets 32,696,276   19,309,049    
Total assets 2,636,606,404   2,266,837,159    
Short-term bank borrowings 240,000,000   200,000,000    
Notes payable 394,285,714   294,348,768    
Accounts payable 670,748,944   856,557,922    
Income taxes payable 933,612   909,115    
Advances from customers 174,904,222   32,623,364    
Deferred revenue-current 75,148,049   50,247,103    
Accrued expenses and other current liabilities 382,533,451   192,470,955    
Amounts due to inter-companies 506,661,309   492,542,370    
Total current liabilities 2,445,215,301   2,119,699,597    
Deferred revenue-non-current 23,316,175   16,886,859    
Deferred income tax liabilities 2,057,892   3,269,464    
Operating lease liabilities-non-current 976,934   89,990    
Other non-current liabilities 12,941,916   9,697,841    
Total liabilities 2,484,508,218   2,149,643,751    
Revenues 4,328,389,653   3,395,510,431 2,645,570,002  
Net Income (Loss) 8,138,514   (129,349,151) (236,441,380)  
Net cash provided by operating activities 343,484,736   51,395,662 93,727,586  
Net cash provided by (used in) investing activities (172,347,587)   (231,450,112) 82,502,334  
Net cash (used in) provided by financing activities 40,000,000   100,000,000 (60,000,000)  
Effect of foreign currency exchange rate changes on cash, cash equivalents and restricted cash 4,076,187   3,099,468 4,599,207  
Net increase (decrease) in cash, cash equivalents and restricted cash 215,213,336   (76,954,982) 120,829,127  
Cash, cash equivalents and restricted cash at the beginning of the year 543,674,553   620,629,535 499,800,408  
Cash, cash equivalents and restricted cash at the end of the year ¥ 758,887,889   ¥ 543,674,553 ¥ 620,629,535