Battery Charge-Discharge Threshold Control for Overcharge Prevention
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Solution Overview
Problem
Existing photovoltaic systems face challenges in preventing overcharge and overdischarge of energy storage batteries, leading to potential damage and reduced battery life due to irreversible polarization and low charge levels.
Innovation Solution
An energy system with a charging and discharging control apparatus that monitors battery levels and currents to prevent overcharge and overdischarge by setting thresholds and adjusting charging and discharging states based on battery state of charge (SOC) or voltage, ensuring safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the energy storage battery is used to store or release DC electric energy to adjust photovoltaic inverter power, then the power adjustment capability is improved, but the battery is exposed to overcharge or overdischarge risk leading to damage and reduced lifespan
Solution Approach 1:
The control apparatus continuously monitors the battery level and charging/discharging currents, using feedback signals to dynamically adjust the charging and discharging operations. When the battery level reaches thresholds or abnormal currents are detected, the system automatically adjusts or stops charging/discharging to prevent overcharge or overdischarge, thus resolving the contradiction between power adjustment capability and battery safety.
Solution Approach 2:
The system pre-configures charging and discharging thresholds before operation begins. By establishing these safety boundaries in advance, the control apparatus can proactively prevent overcharge and overdischarge conditions before they occur, allowing the battery to safely perform power adjustment functions without risking damage.
2Reliability
If classic overcharge and overdischarge protection is implemented by preventing charging in overcharge region and preventing discharging in overdischarge region, then battery damage is prevented, but the system lacks precision in identifying low-current states leading to potential overcharge or overdischarge
Solution Approach 1:
The system introduces a current threshold parameter to distinguish between normal and abnormal charging/discharging states. By monitoring whether currents exceed this threshold, the control apparatus can accurately identify low-current states that classic protection methods might miss, thereby preventing overcharge or overdischarge while maintaining reliable battery protection.
3Ease of operation
If the charging and discharging control apparatus frequently adjusts charging and discharging states based on small current variations, then responsive control is achieved, but frequent state changes occur due to interference factors reducing system stability
Solution Approach 1:
The system uses a current threshold parameter to filter out small current variations caused by interference. Only when currents significantly exceed or fall below this threshold does the control apparatus adjust the charging/discharging state, thereby maintaining system stability while preserving necessary control responsiveness.
Data Source
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AI summary
This application discloses an energy system and a charging and discharging control method. The energy system mainly includes a charging and discharging control apparatus and an energy storage battery. When a battery level is not greater than a discharging level threshold and a charging current of the energy storage battery is less than a charging current threshold, the charging and discharging control apparatus may control the energy storage battery to stop charging and discharging. When the battery level is not less than a charging level threshold and a discharging current of the energy storage battery is less than a discharging current threshold, the charging and discharging control apparatus may also control the energy storage battery to stop charging and discharging. This application helps prevent overcharge and overdischarge of the energy storage battery.