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Long-term investments - Equity method investments (Details)
$ / shares in Units, ¥ in Thousands, kr in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Sep. 01, 2021
CNY (¥)
Jul. 26, 2021
CNY (¥)
shares
Jul. 26, 2021
USD ($)
$ / shares
shares
Aug. 31, 2024
CNY (¥)
Aug. 31, 2024
SEK (kr)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
SEK (kr)
Nov. 30, 2023
CNY (¥)
Dec. 31, 2022
SEK (kr)
Jan. 31, 2022
CNY (¥)
Jul. 31, 2021
CNY (¥)
Jul. 31, 2021
SEK (kr)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2022
CNY (¥)
Jul. 31, 2024
May 31, 2024
CNY (¥)
Jan. 31, 2024
Aug. 31, 2021
Long-term investments                                        
Cash contribution to acquire equity method investment                         ¥ 53,900 $ 7,384 ¥ 0 ¥ 79,442        
Remeasured equity interest at fair value           ¥ 252,407             10,523   252,407          
Gain as a result of deconsolidation                   ¥ 71,974     ¥ 0 $ 0 ¥ 0 71,974        
Suzhou Photon-Matrix | Hubei ECARX                                        
Long-term investments                                        
Equity interest percentage                         13.10%       0.69%   13.10%  
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                                  
Volvo Cars                                        
Long-term investments                                        
Cash contribution to acquire equity method investment           ¥ 17,478     kr 25,620   ¥ 269,813 kr 360,000                
Equity interest (as a percent)           60.00%         40.00% 40.00%     60.00%          
ECARX HK                                        
Long-term investments                                        
Cash contribution to acquire equity method investment           ¥ 11,652 kr 17,080                          
Equity interest (as a percent)           40.00%                 40.00%          
Cash consideration for sale of equity method investment       ¥ 140,725 kr 210,000                              
Gain as a result of deconsolidation | kr         kr 0                              
SiEngine Technology Co., Ltd                                        
Long-term investments                                        
Equity interest (as a percent)     34.61%                   0.00%              
Equity interest sold (as a percent)                         3.29% 3.29%            
Cash consideration for sale of equity method investment                         ¥ 130,000              
Hubei Dongjun Automotive Electronics Technology Co., Ltd.                                        
Long-term investments                                        
Cash contribution to acquire equity method investment               ¥ 49,000                        
Equity interest (as a percent) 49.00%             49.00%                 51.00% 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                                 ¥ 4,900    
Gain as a result of deconsolidation ¥ 10,579                                      
Suzhou Photon-Matrix                                        
Long-term investments                                        
Equity interest sold (as a percent)                   3.45%                    
Cash consideration for sale of equity method investment                   ¥ 10,000                    
Remeasured equity interest at fair value                   ¥ 64,000           64,000        
Gain as a result of deconsolidation                               ¥ 71,974        
Suzhou Photon-Matrix | Maximum                                        
Long-term investments                                        
Equity interest (as a percent)                   50.92%     62.27%              
Suzhou Photon-Matrix | Minimum                                        
Long-term investments                                        
Equity interest (as a percent)                   49.17%