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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2025
Summary of Significant Accounting Policies |
Schedule of significant unobservable inputs adopted in the valuation | ​
​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2024 | ​ | December 31, 2025
Unobservable Input | ​ ​ ​ |  | ​ ​ ​ |
Expected volatility |  | 49%-52% |  | 49%-52%
Probability |  | Liquidation scenario: 20%-43% Redemption scenario: 0%-43% IPO scenario: 15%-80% |  | Liquidation scenario:20%-43% Redemption scenario: 20%-43% IPO scenario: 15%-60%
Schedule of cash and cash equivalents | ​
​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31,
​ | ​ ​ ​ | 2024 | ​ ​ ​ | 2025
Cash and cash equivalents |  | 19,328,920 |  | 11,274,094
Restricted cash |  | 8,320,728 |  | 14,745,975
Long-term restricted cash |  | 97,720 |  | 88,325
Total |  | 27,747,368 |  | 26,108,394
Schedule of expected credit loss provision for the current and non-current assets | Balance as at December 31, 2024
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Expected | ​ | Expected
​ | ​ | Original | ​ | credit loss | ​ | credit loss
​ | ​ ​ ​ | amount | ​ ​ ​ | Rate | ​ ​ ​ | provision
Current assets: |  | ​ |  | ​ |  | ​
Trade and notes receivable |  | 1,714,786 |  | 2.25 | % | 38,540
Amounts due from related parties |  | 7,712,546 |  | 0.13 | % | 10,142
Prepayments and other current assets |  | 3,634,868 |  | 0.05 | % | 1,912
Non-current assets: |  | ​ |  | ​ |  | ​
Other non-current assets |  | 3,632,523 |  | 1.63 | % | 59,386
​ Balance as at December 31, 2025
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Expected | ​ | Expected
​ | ​ | Original | ​ | credit loss | ​ | credit loss
​ | ​ ​ ​ | amount | ​ ​ ​ | Rate | ​ ​ ​ | provision
Current assets: |  | ​ |  | ​ |  | ​
Trade and notes receivable |  | 1,421,006 |  | 1.87 | % | 26,561
Amounts due from related parties |  | 16,098,829 |  | 0.13 | % | 20,579
Prepayments and other current assets |  | 4,855,060 |  | 0.03 | % | 1,450
Non-current assets: |  | ​ |  | ​ |  | ​
Other non-current assets |  | 7,448,284 |  | 0.20 | % | 14,699
Schedule of estimate useful life of property, plant and equipment | ​
| ​ ​ ​ | Useful lives
Buildings and constructions | ​ | 20 years
Production facilities | ​ | 3 to 10 years
Charging and power swap infrastructure | ​ | 5 to 8 years
R&D equipment | ​ | 5 to 15 years
Computer and electronic equipment | ​ | 3 to 5 years
Purchased software | ​ | 1 to 5 years
Leasehold improvements | ​ | Shorter of the estimated useful life or remaining lease term (ranging from 1 to 10 years)
Vehicles for corporate use or customers’ subscription | ​ | 5 years
Others (office equipment, after-sales equipment, etc.) | ​ | 3 to 5 years
Schedule of estimate useful life of intangible assets, net | ​
| ​ |
| ​ ​ ​ | Useful lives
Domain name | ​ | 5 years
Schedule of reconciliation of carried-forward warranty liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Year Ended December 31,
​ | ​ ​ ​ | 2023 | ​ ​ ​ | 2024 | ​ ​ ​ | 2025
Warranty – beginning of year |  | 2,946,937 |  | 3,912,224 | ​ | 4,720,712
Provision for warranty |  | 1,222,916 |  | 1,168,121 | ​ | 1,118,803
Warranty costs incurred |  | (257,629) |  | (359,633) | ​ | (376,626)
Warranty– end of year |  | 3,912,224 |  | 4,720,712 | ​ | 5,462,889

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