A pre-charge circuit, a battery management system, a battery pack and a pre-charge method

By replacing MOSFETs and current-limiting devices with low-dropout linear regulators (LDOs) to construct a pre-charge circuit, the problems of high cost and poor stability in existing technologies are solved, achieving cost reduction and structural simplification.

CN114400735BActive Publication Date: 2025-11-25NINGDE AMPEREX TECHNOLOGY LTD
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Patent Information

Application Number
CN202111650619.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2021-12-30
Publication Date
2025-11-25
Estimated Expiration
2041-12-30

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Abstract

The embodiment of the application provides a pre-charging circuit, a battery management system, a battery pack and a pre-charging method, and is applied to the technical field of batteries. The pre-charging circuit comprises an LDO, a first connection end and a second connection end, the first connection end is used for electrically connecting with a positive electrode of an external battery module, the second connection end is used for electrically connecting with a negative electrode of the external battery module, and the first connection end and the second connection end are also used for electrically connecting with an external device; wherein the LDO is configured to be electrically connected between the negative electrode of the external battery module and the second connection end, and an input end of the LDO is electrically connected with the second connection end; in response to the LDO being turned on, the positive electrode of the external battery module, the first connection end, the external device, the second connection end, the LDO and the first circuit in which the negative electrode of the external battery module is located are turned on. Through the scheme, the cost of the pre-charging circuit can be reduced.
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