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Summary of significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2023
Summary of significant accounting policies |
Schedule of estimated useful lives of the various classes of assets | ​
​ | ​ | ​
Furniture and office equipment |  | 3 – 5 years
Machinery | ​ | 5 – 10 years
Vehicles | ​ | 3 – 5 years
Computer equipment | ​ | 3 – 5 years
Leasehold improvement | ​ | shorter of remaining lease period and estimated useful life
Schedule of estimated useful lives of intangible assets | ​
​ | ​ | ​
Trademarks |  | 10 years
Patent right | ​ | 10 years
Software | ​ | 3 – 5 years
Customer relationship | ​ | 10 years
Schedule of supplier finance program | ​
​ | ​ | ​ | ​ | ​
​ |  | Year ended December 31,
​ | ​ | 2022 | ​ | 2023
​ | ​ | RMB | ​ | RMB
​ | ​ | ​ | ​ | ​
Balance at the beginning of the year |  | 228,104 |  | 186,261
Invoices confirmed during the year |  | 392,323 |  | 621,071
Confirmed invoices paid during the year |  | (434,166) |  | (585,809)
Balance at the end of the year |  | 186,261 |  | 221,523
​

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