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Short-term borrowings (Details)
1 Months Ended 12 Months Ended
Sep. 30, 2022
CNY (¥)
Aug. 31, 2022
CNY (¥)
Aug. 31, 2021
CNY (¥)
Mar. 31, 2021
CNY (¥)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2021
USD ($)
Short-term borrowings                  
Term of short term borrowings 6 months 1 year   6 months          
Short term borrowings | ¥ ¥ 20,000,000 ¥ 50,208,800   ¥ 100,000,000 ¥ 70,208,800   ¥ 166,500,000    
Repayment of short term borrowings     ¥ 1,715,417   ¥ 166,500,000 $ 24,140,231 ¥ 450,545,000 ¥ 161,000,000  
Borrowings secured by Restricted cash | $                 $ 29,050,000
weighted average interest rate         5.71%   3.17%   3.17%