Battery protection circuit for microcontroller crash in battery management system

By designing a switch control and activation circuit for battery protection, the safety hazards of the battery management system when the microcontroller crashes are solved, and the battery management system is activated and power supply is maintained in the event of a hardware crash, thus ensuring the safety of the system.

CN224418432UActive Publication Date: 2026-06-26瑞河(重庆)新能源科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
瑞河(重庆)新能源科技有限公司
Filing Date
2025-05-23
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

In existing technologies, when a microcontroller crashes, the software watchdog timer cannot detect the hardware crash in a timely manner, leading to safety hazards in the battery management system.

Method used

A battery protection circuit is designed, including a switch control circuit and an activation circuit. The activation component provides a signal to turn on the switch control circuit, receives power current to activate the battery management system, and maintains power supply through a holding circuit, thus solving the problem of power loss of the battery management system when the microprocessor fails.

Benefits of technology

It enables timely activation of the battery management system in the event of a microcontroller hardware crash, maximizing system safety and avoiding risks such as overcharging, over-discharging, and thermal runaway.

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Abstract

The utility model discloses a battery protection circuit for microcontroller dead time in battery management system, including switch control circuit and activation circuit, the first end of switch control circuit is through POWER-IN port and is accessed battery management system, and the second end of switch control circuit is connected with power B+, and the third end of switch control circuit is connected activation component through KEY-POWER-EN port, the first end of activation circuit is connected with the third end of switch control circuit, and the second end of activation circuit is connected with microcontroller through holding circuit, and the third end of activation circuit is grounded, through the activation of battery management system to maintain the power supply of battery management system after activation to the problem that when existing MCU hardware dead condition, the prior art adopts software watchdog timer and cannot detect hardware dead condition in time, thereby leading to the security hidden danger of battery management system, the safety of battery management system is guaranteed to the maximum.
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