Battery short-circuit protection method and circuit thereof, battery management system and equipment

By using current signal comparison and timing mechanisms in the battery management system to distinguish between short-circuit faults and transient interference, the problem of short-circuit protection failure of the battery management system under high-power AC load is solved, and fast and reliable short-circuit detection and protection are achieved.

CN122456731APending Publication Date: 2026-07-24SRNE SOLAR CO LTD
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Patent Information

Application Number
CN202610622228.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-07
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing battery management systems cannot reflect current sampling signals in a timely and accurate manner under high-power AC loads, leading to short-circuit protection failure and poor reliability.

Method used

By acquiring the current signal of the battery charging and discharging circuit and comparing it with the voltage signal corresponding to the current threshold, the falling edge interrupt and timing mechanism are used to distinguish between real short circuit faults and transient interference. Only when the level remains low after the delay is it determined to be a short circuit and the protection action is triggered.

Benefits of technology

It enables rapid and reliable detection and protection against microsecond-level short-circuit faults under high-power AC loads, avoiding false triggering of short-circuit protection due to transient interference, and improving the accuracy and reliability of detection and protection.

✦ Generated by Eureka AI based on patent content.
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Abstract

The invention relates to a battery short-circuit protection method, a battery short-circuit protection circuit, a battery management system and equipment. Comprising the steps of obtaining charge-discharge current of a battery charge-discharge loop; comparing the voltage signal corresponding to the charging and discharging current with the voltage signal corresponding to the current threshold value and outputting a level signal; monitoring the level signal, and capturing the level change of the level signal; when it is monitored that the level signal changes from high to low, a falling edge interrupt request is generated, and after the falling edge interrupt request is detected, a falling edge interrupt service program is entered; in the falling edge interruption service program, starting a timing mechanism, and capturing the level change of the level signal again after timing reaches a preset timing time value; if the level signal is still kept at the low level, determining that the signal is a battery short-circuit fault signal, and controlling to trigger a short-circuit protection action; and if the level signal is recovered to the high level, judging that the level signal is an instantaneous interference signal, not triggering a short-circuit protection action, and quitting a falling edge interruption service program. The short-circuit protection reliability can be improved.
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