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INVENTORIES
12 Months Ended
Dec. 31, 2022
INVENTORIES  
INVENTORIES

4.

INVENTORIES

As of December 31, 

2021

2022

    

RMB

    

RMB

Raw materials

 

123,940

 

290,121

Work-in-process

 

91,898

 

180,367

Finished goods

 

160,406

 

176,364

Inventories

 

376,244

 

646,852

Inventory write-off were RMB16,600 and RMB39,431, respectively, for the years ended December 31, 2021 and 2022.