Commitment and Contingencies - Capital commitments (Details) - CNY (¥) ¥ in Thousands |
Jun. 30, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Commitment and Contingencies | ||
| Property, plant and equipment | ¥ 4,504,445 | ¥ 5,896,469 |
| Leasehold improvements | 505,403 | 527,363 |
| Total | ¥ 5,009,848 | ¥ 6,423,832 |