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Summary of Significant Accounting Policies - Property, plant and equipment, net (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Summary of Significant Accounting Policies
Changes in estimates	true
Depreciation expenses	¥ 4,525,501	¥ 2,994,826	¥ 1,758,370
Change in production volume
Summary of Significant Accounting Policies
Depreciation expenses	¥ 851,457
Minimum \| Building and building improvements
Summary of Significant Accounting Policies
Estimated useful lives (in years)	5 years
Minimum \| Production machineries, facilities and equipment
Summary of Significant Accounting Policies
Estimated useful lives (in years)	2 years
Minimum \| Motor vehicles
Summary of Significant Accounting Policies
Estimated useful lives (in years)	2 years
Maximum \| Building and building improvements
Summary of Significant Accounting Policies
Estimated useful lives (in years)	20 years
Maximum \| Production machineries, facilities and equipment
Summary of Significant Accounting Policies
Estimated useful lives (in years)	10 years
Maximum \| Motor vehicles
Summary of Significant Accounting Policies
Estimated useful lives (in years)	4 years