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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
	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)

X

- 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

X

- References

No definition available.

+ Details

Name:	ucar_ScheduleOfAllowanceForDoubtfulAccountsAbstract
Namespace Prefix:	ucar_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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