Battery Pack Protection Circuit for Overvoltage and Inrush Safety
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Solution Overview
Problem
Existing energy storage systems face safety issues due to potential explosions, ignitions, and gas emissions, with existing protection circuits failing to adequately address short circuits and overvoltage caused by external factors, requiring a multiplexed protection technology to ensure product safety.
Innovation Solution
The energy storage system incorporates multiple safety devices, including relays, voltage sensors, current sensors, and a microcomputer for real-time monitoring and control, enabling immediate hardware responses to overvoltage or overcurrent situations without software determination, and a multi-step power-on design to prevent damage from inrush currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single protection circuit is used, then the device complexity is reduced, but the reliability of protection against short circuit and overvoltage deteriorates
Solution Approach 1:
The protection system is divided into multiple independent protection circuits, each responsible for detecting specific fault conditions (short circuit, overvoltage, overcurrent). Each circuit operates independently to provide targeted protection, improving overall reliability while maintaining manageable complexity through functional segmentation.
Solution Approach 2:
The system implements preemptive protection measures by continuously monitoring voltage, current, and temperature parameters before dangerous conditions develop. Protection circuits are designed to detect early signs of faults and trigger protective actions before catastrophic failures occur, cushioning against potential damage.
2Reliability
If manual input is required for restarting, then the ease of operation is reduced, but the reliability of protection operation is improved
Solution Approach 1:
The system performs preliminary safety checks and automatic recovery operations before allowing restart. Protection circuits pre-validate system conditions and automatically clear minor faults, enabling seamless restart without manual intervention while maintaining protection reliability through pre-validated safe states.
Solution Approach 2:
The protection system incorporates self-diagnosis and self-recovery capabilities that automatically detect faults, trigger appropriate protection responses, and restore normal operation without requiring manual input. The system serves itself by continuously monitoring and autonomously managing its own safety and operational state.
3Reliability
If power is turned on without protection, then the ease of operation is improved, but the reliability of circuit protection deteriorates
Solution Approach 1:
Before power is applied to the system, protection circuits perform preliminary safety validations by checking voltage levels, current paths, and component integrity. This preliminary action ensures that power-on does not create dangerous conditions, maintaining protection reliability while managing complexity through structured pre-power checks.
Solution Approach 2:
The system implements preliminary anti-actions by detecting potential harmful conditions before they can cause damage. Protection circuits preemptively block power delivery or trigger protective measures when abnormal conditions are detected during power-on, preventing short circuits and overvoltage before they can affect the system.
Data Source
AI summary
An energy storage system includes: a battery configured to at least store received electrical energy in a form of direct current, or output the stored electrical energy; a power conditioning system configured to convert an electrical characteristic to charge or discharge the battery; and a battery management system configured to monitor state information of the battery, wherein the battery includes a plurality of battery packs each including a respective plurality of battery cells, wherein the battery management system includes: battery pack circuit boards which are disposed in each of the plurality of battery packs, and configured to obtain state information of the plurality of battery cells included in each battery pack; and a main circuit board coupled to the battery pack circuit boards by a communication line, and configured to receive state information obtained by the battery pack circuit boards from each battery pack.