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Intangible asset (Details) - CNY (¥)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Statement [Line Items]    
Cost, Beginning Balance ¥ 9,000 ¥ 9,000
Addition 44,843,000  
Cost, Ending Balance 44,852,000 9,000
Accumulated amotization, Beginning Balance 4,000 4,000
Amortization 1,000 0
Accumulated amotization, Ending Balance 5,000 4,000
Carrying Amount 44,847,000 5,000
Land Use Right [Member]    
Statement [Line Items]    
Cost, Beginning Balance 0 0
Addition 44,843,000  
Cost, Ending Balance 44,843,000 0
Accumulated amotization, Beginning Balance 0 0
Amortization 0 0
Accumulated amotization, Ending Balance 0 0
Carrying Amount 44,843,000 0
Acquired Computer Software [Member]    
Statement [Line Items]    
Cost, Beginning Balance 9,000 9,000
Addition 0  
Cost, Ending Balance 9,000 9,000
Accumulated amotization, Beginning Balance 4,000 4,000
Amortization 1,000 0
Accumulated amotization, Ending Balance 5,000 4,000
Carrying Amount ¥ 4,000 ¥ 5,000