Battery Charge-Discharge Threshold Control for Overcharge Prevention
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Solution Overview
Problem
Photovoltaic systems face challenges in preventing overcharge and overdischarge of energy storage batteries, leading to damage and reduced battery life due to irreversible polarization and excessive discharge.
Innovation Solution
A charging and discharging control apparatus that monitors battery levels and currents, setting thresholds to prevent overcharge and overdischarge by controlling charging and discharging operations based on state of charge (SOC) and battery voltage, ensuring safe charging and discharging within defined limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the battery level is allowed to discharge completely to maximize energy utilization, then the energy efficiency is improved, but the battery durability deteriorates due to overdischarge damage
Solution Approach 1:
The patent dynamically adjusts the discharging level threshold and discharging current threshold based on the battery's state of charge and operational conditions. By changing these parameters adaptively rather than using fixed thresholds, the system maximizes energy utilization during favorable conditions while preventing overdischarge damage when the battery is in vulnerable states, thus resolving the contradiction between energy efficiency and battery durability.
2Speed
If the charging current is increased to speed up battery charging, then the charging speed is improved, but the battery safety deteriorates due to overcharge risk
Solution Approach 1:
The patent implements dynamic control of charging current based on real-time battery state monitoring. The charging current threshold is adjusted dynamically according to the battery level and operational conditions, allowing high charging currents when the battery can safely accept them (improving charging speed) while automatically reducing or stopping charging when approaching safety limits (maintaining battery safety). This dynamic adaptation resolves the contradiction between charging speed and battery safety.
Data Source
AI summary
An 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.