Exhibit 15.1

Consent of Independent Registered Public Accounting Firm

We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (No. 333-229952 and No. 333-272537) of NIO Inc. of our report dated April 9, 2024 relating to the financial statements and the effectiveness of internal control over financial reporting, which appears in this Form 20-F.

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