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Related Party Balances and Transactions - Purchase of services (Details) - Related party - Purchase of service - CNY (¥) ¥ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Related Party Balances and Transactions |  |  |
Purchase of services | ¥ 47,719 | ¥ 153,799 | ¥ 249,996
Kunshan Siwopu Intelligent Equipment Co., Ltd. |  |  |
Related Party Balances and Transactions |  |  |
Purchase of services | 26,178 | 5,738 |
Wuhan Weineng Battery Assets Co., Ltd. and its subsidiaries |  |  |
Related Party Balances and Transactions |  |  |
Purchase of services | 9,694 | 17,594 | 23,878
Tianjin Tengyi Information Technology Co., Ltd. |  |  |
Related Party Balances and Transactions |  |  |
Purchase of services | 9,650 | 15,031 | 7,823
Jianglai Advanced Manufacturing Technology (Anhui) Co., Ltd. |  |  |
Related Party Balances and Transactions |  |  |
Purchase of services | 1,554 | 92,549 | 184,279
Xunjie Energy (Wuhan) Co., Ltd. |  |  |
Related Party Balances and Transactions |  |  |
Purchase of services | 603 | 1,225 |
Beijing WeLion New Energy Technology Co., Ltd. |  |  |
Related Party Balances and Transactions |  |  |
Purchase of services | ¥ 40 | 21,603 | ¥ 34,016
VTA Technology Inc. and its subsidiaries |  |  |
Related Party Balances and Transactions |  |  |
Purchase of services |  | ¥ 59 |

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