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Summary of significant accounting policies (Tables)
12 Months Ended
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