Battery Low-Power Threshold Control for Over-Discharge Protection
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Solution Overview
Problem
Existing energy storage systems lack active protection capabilities and employ singular control methods, leading to incomplete systematic protection, resulting in issues such as battery self-discharge, downtime, and irreversible damage due to inadequate charging and discharging management.
Innovation Solution
A control method that determines the real-time state of a battery based on charging/discharging instructions, implements low-power logic threshold protection by prohibiting discharging when capacity falls below a preset threshold, and manages forced charging to maintain battery health.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a singular control method is used by the BMS system, then the control logic is simple, but the systematic protection is incomplete and active protection capability is absent
Solution Approach 1:
The control method is segmented into multiple hierarchical levels: real-time state monitoring, threshold judgment layers (multiple thresholds for different protection levels), and differentiated control strategies. This segmentation transforms a singular control method into a multi-layered protection system that maintains simplicity at each layer while achieving comprehensive protection overall.
Solution Approach 2:
The system performs preliminary actions by setting multiple low-power thresholds in advance and establishing predetermined control strategies for each threshold level. When the battery state approaches dangerous levels, the system has already prepared appropriate protection measures, enabling proactive rather than reactive control and ensuring complete systematic protection.
2Productivity
If discharging is allowed without low-power threshold protection, then the energy supply is continuous, but the battery suffers irreversible damage and self-discharge persists
Solution Approach 1:
The control system dynamically adjusts discharging permissions based on real-time battery state and threshold comparisons. Rather than a static on/off control, the system continuously monitors battery parameters and dynamically switches between different control strategies (allowing discharge, limiting discharge, or prohibiting discharge) to maintain both energy supply continuity and battery health integrity.
Solution Approach 2:
The system implements feedback control by continuously monitoring battery state parameters, comparing them against predefined thresholds, and adjusting control actions accordingly. This closed-loop feedback mechanism ensures that discharging is permitted only when safe, and automatically triggers protection measures when thresholds are approached, preventing irreversible damage while maintaining energy supply when conditions permit.
3Reliability
If the BMS system stops discharging at low power, then the battery is protected from over-discharge, but the system experiences downtime and fails to provide timely energy supply
Solution Approach 1:
The system performs preliminary protection actions by implementing gradual control strategies at multiple threshold levels before reaching the point of complete discharging prohibition. This allows the system to prepare for and transition into protection mode smoothly, minimizing abrupt stoppages and reducing system downtime while still preventing over-discharge damage.
Solution Approach 2:
The control system employs periodic monitoring and staged control actions rather than a single abrupt stop. By checking battery state continuously and applying control measures periodically at different threshold levels, the system maintains protection effectiveness while allowing brief operational windows between threshold checks, thereby reducing overall system downtime.
Data Source
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AI summary
This application provides a control method and system for low-power logic threshold protection of an energy storage system. The method includes: reading a charging/discharging instruction state of a battery of the energy storage system; determining a real-time state of the battery based on the charging/discharging instruction state of the battery; determining, based on the real-time state of the battery, whether a remaining capacity of the battery is less than a preset low-power threshold; and performing low-power logic threshold protection control management on the battery of the energy storage system if the remaining capacity of the battery is less than the preset low-power threshold. In this way, the real-time state of the battery is determined based on the charging/discharging instruction state of the battery of the energy storage system; whether the remaining capacity of the battery is less than the preset low-power threshold is determined based on the real-time state of the battery; and low-power logic threshold protection control management may be performed on the battery of the energy storage system when the remaining capacity of the battery is less than the preset low-power threshold, thereby resolving a problem that an existing energy storage system employs a singular control method with incomplete systematic protection for the energy storage system and without an active protection capability.