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Long-term investments - Equity method investments (Details)
$ / shares in Units, ¥ in Thousands, kr in Thousands, $ in Thousands
1 Months Ended 2 Months Ended 12 Months Ended
Sep. 01, 2021
CNY (¥)
Jul. 26, 2021
CNY (¥)
shares
Jul. 26, 2021
USD ($)
$ / shares
shares
Apr. 28, 2021
CNY (¥)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
SEK (kr)
Apr. 30, 2022
investment
Jan. 31, 2022
CNY (¥)
Jul. 31, 2021
CNY (¥)
Jul. 31, 2021
SEK (kr)
May 31, 2021
CNY (¥)
Mar. 31, 2022
CNY (¥)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
Jun. 30, 2023
Aug. 31, 2021
Long-term investments                                    
Cash contribution to acquire equity method investment                         ¥ 0 $ 0 ¥ 79,442 ¥ 1,145,637    
Excess of consideration over the carrying amount of the equity investment                               689,670    
Remeasured equity interest at fair value         ¥ 284,536               252,407   284,536      
Gain as a result of deconsolidation               ¥ 71,974         ¥ 0 $ 0 71,974 ¥ 10,579    
JICA                                    
Long-term investments                                    
Ownership interest                                 70.00%  
SiEngine Technology Co., Ltd                                    
Long-term investments                                    
Cash contribution to acquire equity method investment   ¥ 68,967 $ 10,600                              
Value of shares issued to acquire equity method investment   620,703 95,800                              
Carrying amount of the Company's controlling shareholder | $     $ 0                              
Excess of consideration over the carrying amount of the equity investment   ¥ 689,670                                
SiEngine Technology Co., Ltd | Series B Redeemable Convertible Preferred                                    
Long-term investments                                    
Number of shares issued to acquire equity method investment | shares   9,882,082 9,882,082                              
Issuance price (in USD per share) | $ / shares     $ 9.70                              
Geely Group                                    
Long-term investments                                    
Equity interest (as a percent)       50.00%                            
Cash contribution to acquire equity method investment       ¥ 200,000                            
Suzhou Chenling Investment LLP                                    
Long-term investments                                    
Equity interest (as a percent)                     9.416%              
Cash contribution to acquire equity method investment                     ¥ 200,000              
Volvo Cars                                    
Long-term investments                                    
Equity interest (as a percent)                 40.00% 40.00%     60.00%          
Cash contribution to acquire equity method investment         17,478 kr 25,620     ¥ 269,813 kr 360,000                
SiEngine Technology Co., Ltd                                    
Long-term investments                                    
Equity interest (as a percent)     34.61%                              
Hubei Dongjun Automotive Electronics Technology Co., Ltd.                                    
Long-term investments                                    
Equity interest (as a percent) 49.00%                                 51.00%
Equity interest sold (as a percent) 2.00%                                  
Cash consideration for sale of equity method investment ¥ 1,000                                  
Remeasured equity interest at fair value 24,500                                  
Gain as a result of deconsolidation ¥ 10,579                                  
Suzhou Photon-Matrix                                    
Long-term investments                                    
Equity interest sold (as a percent)               3.45%                    
Number of equity method investments spun off | investment             3                      
Cash consideration for sale of equity method investment               ¥ 10,000                    
Remeasured equity interest at fair value         64,000     ¥ 64,000             64,000      
Gain as a result of deconsolidation                             ¥ 71,974      
Suzhou Photon-Matrix | Minimum                                    
Long-term investments                                    
Equity interest (as a percent)               49.17%                    
Suzhou Photon-Matrix | Maximum                                    
Long-term investments                                    
Equity interest (as a percent)               50.92%                    
ECARX HK                                    
Long-term investments                                    
Equity interest (as a percent)                         40.00%          
Cash contribution to acquire equity method investment         ¥ 11,652 kr 17,080                        
Anhui Xinzhi                                    
Long-term investments                                    
Cash consideration for sale of equity method investment                       ¥ 28,500