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Related party balances and transactions - Related party balances (Details) ¥ in Thousands, £ in Thousands, $ in Thousands |  |  |  |  | 1 Months Ended | 2 Months Ended | 12 Months Ended |  |  |  |
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Feb. 29, 2024 CNY (¥) | Jun. 27, 2022 CNY (¥) | Mar. 28, 2022 CNY (¥) | Mar. 29, 2018 CNY (¥) | Nov. 30, 2023 CNY (¥) | Jan. 31, 2023 CNY (¥) | Feb. 28, 2022 CNY (¥) | Oct. 31, 2021 CNY (¥) | Mar. 31, 2022 CNY (¥) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 CNY (¥) | Mar. 28, 2024 CNY (¥) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2022 GBP (£) | Aug. 25, 2021 USD ($) | Aug. 25, 2021 CNY (¥)
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts due from related parties |  |  |  |  |  |  |  |  |  | $ 10,440 |  |  |  |  | ¥ 74,122 |  | ¥ 911,729 |  |  |
Amounts due to related parties |  |  |  |  |  |  |  |  |  | 5,023 |  |  |  |  | 35,664 |  | 42,843 |  |  |
Other non-current liabilities – related parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Amount of transaction |  |  |  |  | ¥ 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  | 11,170 | ¥ 79,309 | ¥ 44,543 | ¥ 131,585 |  |  |  |  |  |  |
Gain on disposal of property, equipment and intangible assets |  |  |  |  |  |  |  |  |  | (247) | (1,751) | (1,939) | (1,562) |  |  |  |  |  |  |
Software licensing agreement period |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total liabilities |  |  |  |  |  |  |  |  |  | 718,617 |  |  |  |  | 5,102,103 |  | 4,765,488 |  |  |
Operating expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of transaction |  |  |  |  |  |  |  |  |  |  | 47,641 | 62,840 | 23,412 |  |  |  |  |  |  |
Purchase of products and services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of transaction |  |  |  |  |  |  |  |  |  |  | 602,838 | 677,775 | 293,552 |  |  |  |  |  |  |
Loans to related parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of transaction |  |  |  |  |  |  |  |  |  |  | 214,000 | 57,260 | 28,850 |  |  |  |  |  |  |
Interest income on loans due from related parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of transaction |  |  |  |  |  |  |  |  |  |  | 15,955 | 9,069 | 717 |  |  |  |  |  |  |
Advances to related parties | Zhejiang Huanfu |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of transaction |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 19,806 |  |  |  |  |  |  |
Collection of advances from related parties | Zhejiang Huanfu |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of transaction |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 90,155 |  |  |  |  |  |  |
Financial support to related parties | Anhui Xinzhi |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of transaction |  |  |  |  |  |  |  |  | ¥ 28,500 |  | 0 | 28,500 | 0 |  |  |  |  |  |  |
Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  |  |  |  |  |  | 217,715 |  |  |  |  | 1,545,752 |  | 835,320 |  |  |
Amounts due from related parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 74,122 |  | 911,729 |  |  |
Other non-current assets – related parties |  |  |  |  |  |  |  |  |  | 31,599 |  |  |  |  | 224,349 |  | 213,695 |  |  |
Accounts payable – related parties |  |  |  |  |  |  |  |  |  | 39,261 |  |  |  |  | 278,750 |  | 241,773 |  |  |
Amounts due to related parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35,664 |  | 42,843 |  |  |
Other non-current liabilities – related parties |  |  |  |  |  |  |  |  |  | $ 6,270 |  |  |  |  | 44,519 |  | 0 |  |  |
Inventory purchases |  |  |  |  |  |  |  |  |  |  | 41,409 | 29,717 | 51,171 |  |  |  |  |  |  |
Cost of revenues |  |  |  |  |  |  |  |  |  |  | 513,788 | 591,613 | 220,062 |  |  |  |  |  |  |
Lease expense |  |  |  |  |  |  |  |  |  |  | 4,621 | 6,395 | 1,093 |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  | 12,163 | ¥ 12,215 | ¥ 131 |  |  |  |  |  |  |
Related Party | Zhejiang Huanfu |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from disposal of property and equipment |  |  |  |  |  |  | ¥ 1,697 | ¥ 745 |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposal of property, equipment and intangible assets |  |  |  |  |  |  | ¥ 93 | ¥ 38 |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Volvo Cars |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts due from related parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 115,000 | 793,177 |  |  |
Related Party | Arteus |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts due from related parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,866 | £ 3,082 |  |
Related Party | Geely Group | Unsecured bank loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  | ¥ 500,000 |  | ¥ 20,000 |  | ¥ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 4.35% |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 224,349 |  | 213,695 |  |  |
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% | 4.00% |  |  |  |  |  |  |  |  |
Software licensing agreement period |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 94,519 |  |  |  |  |
Related Party | Subsequent events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from customers | ¥ 917,709 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 300,000 |  |  |  |  |  |
Related Party | Purchase of products and services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts due from related parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,420 |  | 29,595 |  |  |
Accounts payable – related parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 228,750 |  | 241,773 |  |  |
Related Party | Technical and logistical services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts due to related parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,701 |  | 29,043 |  |  |
Related Party | Loans and interest receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts due from related parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 65,702 |  | 63,091 |  |  |
Related Party | Borrowings and interest payable on borrowing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts due to related parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 25,963 |  | ¥ 13,800 |  |  |
Related Party | Annual Software Sales | Xingji Meizu |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of transaction |  |  |  |  | ¥ 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Controlling Shareholder | Unsecured bank loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party balances and transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,000 | ¥ 45,152

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