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Other Current Assets and NonCurrent Assets (Details) - Schedule of Allowance for Doubtful Accounts ¥ in Thousands, $ in Thousands | 6 Months Ended | 12 Months Ended
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Jun. 30, 2024 CNY (¥) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 CNY (¥)
Schedule of Allowance for Doubtful Accounts [Abstract] |  |  |
Balance at beginning of the period | ¥ (2,488) | $ (342) | ¥ (1,435)
Additional (allowance)/reversal for doubtful accounts | 135 | 18 | (1,053)
Balance at the end of the period | ¥ (2,353) | $ (324) | ¥ (2,488)

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- Definition Additional (allowance)/reversal for doubtful accounts. + References No definition available. + Details
Name: | ucar_AdditionalallowancereversalForDoubtfulAccounts
Namespace Prefix: | ucar_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | ucar_ScheduleOfAllowanceForDoubtfulAccountsAbstract
Namespace Prefix: | ucar_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of allowance for credit loss on receivable, classified as other and current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)(a)(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_AllowanceForDoubtfulOtherReceivablesCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant