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Related Party Balances and Transactions - Purchase of raw materials or long-lived assets (Details) - Related party - Purchase of raw materials or long-lived assets - 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 raw materials or long-lived assets | ¥ 21,519 | ¥ 293,779 | ¥ 1,247,467
Xunjie Energy (Wuhan) Co., Ltd. |  |  |
Related Party Balances and Transactions |  |  |
Purchase of raw materials or long-lived assets | 12,239 | 37,603 | 111,875
VTA Technology Inc. and its subsidiaries |  |  |
Related Party Balances and Transactions |  |  |
Purchase of raw materials or long-lived assets | 4,917 | 2,485 |
Nanjing Weibang Transmission Technology Co., Ltd. |  |  |
Related Party Balances and Transactions |  |  |
Purchase of raw materials or long-lived assets | ¥ 4,363 | 85,938 | 73,071
Kunshan Siwopu Intelligent Equipment Co., Ltd. |  |  |
Related Party Balances and Transactions |  |  |
Purchase of raw materials or long-lived assets |  | 86,985 | ¥ 1,062,521
Beijing WeLion New Energy Technology Co., Ltd. |  |  |
Related Party Balances and Transactions |  |  |
Purchase of raw materials or long-lived assets |  | 48,547 |
Jianglai Advanced Manufacturing Technology (Anhui) Co., Ltd. |  |  |
Related Party Balances and Transactions |  |  |
Purchase of raw materials or long-lived assets |  | 32,213 |
Wuhan Weineng Battery Assets Co., Ltd. and its subsidiaries |  |  |
Related Party Balances and Transactions |  |  |
Purchase of raw materials or long-lived assets |  | ¥ 8 |

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