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Related party balances and transactions - Related party balances (Details) ¥ in Thousands, $ in Thousands |  |  | 1 Months Ended | 12 Months Ended |  |  |
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Jun. 27, 2022 CNY (¥) | Mar. 28, 2022 CNY (¥) | Mar. 31, 2024 CNY (¥) | Nov. 30, 2023 CNY (¥) | Jan. 31, 2023 CNY (¥) | Feb. 28, 2022 CNY (¥) | Dec. 31, 2024 CNY (¥) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2024 USD ($) | Jun. 30, 2024 CNY (¥) | Jan. 31, 2024 CNY (¥)
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts due from related parties |  |  |  |  |  |  | ¥ 35,367 |  | ¥ 74,122 |  | $ 4,845 |  |
Amounts due to related parties |  |  |  |  |  |  | 177,886 |  | 35,664 |  | 24,370 |  |
Amount of transaction |  |  |  | ¥ 50,000 |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  | 133,761 | $ 18,325 | 79,309 | ¥ 44,543 |  |  |
Gain on disposal of property, equipment and intangible assets |  |  |  |  |  |  | 465 | $ 64 | (1,751) | (1,939) |  |  |
Software licensing agreement period |  |  |  | 3 years |  |  |  |  |  |  |  |  |
Total liabilities |  |  |  |  |  |  | 5,516,026 |  | 5,138,852 |  | 755,690 |  |
Zhejiang Huanfu |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |
Inventory purchases |  |  |  |  |  |  | 25,107 |  | 101,587 | 64,667 |  |  |
Cost of Revenue |  |  |  |  |  |  | 8 |  | 420 | 0 |  |  |
Purchase of products and services |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of transaction |  |  |  |  |  |  | 1,135,797 |  | 635,744 | 677,775 |  |  |
Purchase of products and services | Zhejiang Huanfu |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of transaction |  |  |  |  |  |  | 25,115 |  | 102,007 | 64,667 |  |  |
Purchase of products and services | Hubei ECARX |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of transaction |  |  |  |  |  |  | 18,195 |  | 3,306 | 0 |  |  |
Loans to related parties |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of transaction |  |  |  |  |  |  | 10,800 |  | 214,000 | 57,260 |  |  |
Interest income on loans due from related parties |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of transaction |  |  |  |  |  |  | 449 |  | 5,300 | 1,329 |  |  |
Interest income on loans due from related parties | Hubei ECARX |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of transaction |  |  |  |  |  |  | 11,249 |  | 10,655 | 7,740 |  |  |
Financial support to related parties | Anhui Xinzhi |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of transaction |  |  |  |  |  |  | 0 |  | 0 | 28,500 |  |  |
Annual Software Sales | Smart Zhejiang |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts due to related parties |  |  |  |  |  |  | 45,332 |  |  |  |  |  |
Amount of transaction |  |  | ¥ 49,000 |  |  |  |  |  |  |  |  |  |
Rental of office space, and administrative services |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of transaction |  |  |  |  |  |  | 5,611 |  | 4,621 | 6,395 |  |  |
Related Party |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  |  |  | 1,373,833 |  | 1,572,703 |  | 188,214 |  |
Amounts due from related parties |  |  |  |  |  |  | 35,367 |  | 74,122 |  |  |  |
Other non-current assets – related parties |  |  |  |  |  |  | 267,260 |  | 224,349 |  | 36,614 |  |
Accounts payable – related parties |  |  |  |  |  |  | 512,638 |  | 312,830 |  | 70,231 |  |
Amounts due to related parties |  |  |  |  |  |  | 177,886 |  | 35,664 |  |  |  |
Other non-current liabilities – related parties |  |  |  |  |  |  | 0 |  | 44,519 |  | $ 0 |  |
Inventory purchases |  |  |  |  |  |  | 130,255 |  | 41,409 | 29,717 |  |  |
Cost of Revenue |  |  |  |  |  |  | 887,098 |  | 546,694 | 591,613 |  |  |
Interest expense |  |  |  |  |  |  | 15,609 |  | 12,163 | 12,215 |  |  |
Related Party | Unsecured bank loans |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  | 299,000 |  |  |  |  |  |
Related Party | Zhejiang Huanfu |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from disposal of property and equipment |  |  |  |  |  | ¥ 1,697 |  |  |  |  |  |  |
Gain on disposal of property, equipment and intangible assets |  |  |  |  |  | ¥ 93 |  |  |  |  |  |  |
Related Party | Geely Group | Unsecured bank loans |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt | ¥ 500,000 |  | ¥ 149,000 |  | ¥ 300,000 |  | 200,000 |  |  |  |  | ¥ 100,000 | ¥ 300,000
Interest rate | 4.35% |  |  |  | 4.10% |  |  |  |  |  |  |  |
Related Party | Hubei Xingji Times Technology Co., Ltd | Unsecured bank loans |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  | ¥ 200,000 |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 2.25% |  |  |  |  |  |  |  |  |  |  |
Related Party | Hubei ECARX |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |
Other non-current assets – related parties |  |  |  |  |  |  | 235,598 |  | 224,349 |  |  |  |
Amount of transaction |  |  |  |  |  |  | ¥ 252,287 |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 5.00% | 5.00% |  |  |  |  |
Related Party | Xingji Meizu |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable – related parties |  |  |  |  |  |  | ¥ 50,000 |  |  |  |  |  |
Other non-current liabilities – related parties |  |  |  |  |  |  | 44,519 |  |  |  |  |  |
Interest rate |  |  |  | 4.00% |  |  |  |  |  |  |  |  |
Software licensing agreement period |  |  |  | 3 years |  |  |  |  |  |  |  |  |
Total liabilities |  |  |  |  |  |  | 94,519 |  |  |  |  |  |
Related Party | Smart Zhejiang |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  |  |  | 13,670 |  |  |  |  |  |
Other non-current assets – related parties |  |  |  |  |  |  | ¥ 31,662 |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 3.95% | 3.95% |  |  |  |  |
Software licensing agreement period |  |  |  | 3 years |  |  |  |  |  |  |  |  |
Related Party | Operating expense |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of transaction |  |  |  |  |  |  | ¥ 118,444 |  | 47,641 | 62,840 |  |  |
Related Party | Purchase of products and services |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts due from related parties |  |  |  |  |  |  | 25,364 |  | 8,420 |  |  |  |
Accounts payable – related parties |  |  |  |  |  |  | 465,107 |  | 262,830 |  |  |  |
Related Party | Technical and logistical services |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts due to related parties |  |  |  |  |  |  | 18,193 |  | 9,701 |  |  |  |
Related Party | Loans and interest receivable |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts due from related parties |  |  |  |  |  |  | 10,003 |  | 65,702 |  |  |  |
Related Party | Borrowings and interest payable on borrowing |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts due to related parties |  |  |  |  |  |  | 9,693 |  | 25,963 |  |  |  |
Related Party | Annual Software Sales | Xingji Meizu |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of transaction |  |  |  | ¥ 50,000 |  |  |  |  |  |  |  |  |
Related Party | Rental of office space, and administrative services |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of transaction |  |  |  |  |  |  | ¥ 5,611 |  | ¥ 4,621 | ¥ 6,395 |  |  |

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