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Restricted Net Assets (Details) ¥ in Thousands, $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2024 CNY (¥)	Jun. 30, 2024 USD ($)	Dec. 31, 2023 CNY (¥)
Restricted Net Assets [Line Items]
Annual least percentage	10.00%	10.00%
Annual net profit percentage	50.00%	50.00%
Paid-in capital	¥ 609,707	$ 83,899	¥ 585,991
PRC [Member]
Restricted Net Assets [Line Items]
Annual least percentage	10.00%	10.00%
Annual net profit percentage	50.00%	50.00%

X

- Definition

Annual net profit percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	ucar_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of other increase (decrease) in additional paid in capital (APIC).

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Percentage of employer's matching contributions to a defined contribution plan that vests in a given year.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: