Fuel Cell System Battery Charge Control
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Solution Overview
Problem
Fuel cell systems face the challenge of maintaining sufficient output power while preventing secondary battery over-discharge, which leads to performance degradation, as imposing discharge limitations on the battery can result in insufficient power supply to the load.
Innovation Solution
A fuel cell system with a power supply circuit, a decision value acquirer to monitor ion concentration localization in the secondary battery, and a controller that limits discharge when the decision value exceeds a predetermined reference, also adjusting fuel cell output power to charge the battery and maintain system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a limitation is imposed on discharge from the secondary battery to suppress degradation of battery performance, then the battery performance is improved, but the output power becomes insufficient for the required power from the load
Solution Approach 1:
The system performs preliminary charging of the secondary battery using fuel cell power when the decision value is high, before the battery enters an over-discharge state. This advance action ensures the battery is recharged during periods when load power requirements are low, preventing future power shortages while maintaining battery health
Solution Approach 2:
The system continuously monitors the decision value reflecting ion concentration localization in the secondary battery and dynamically adjusts the power distribution between fuel cell and battery. When the decision value exceeds a threshold, the system feedback-controls the fuel cell output to charge the battery, and adjusts discharge limitations based on real-time battery status
2Productivity
If the secondary battery is used to supply required power from the load, then the productivity is improved, but the secondary battery falls into an over-discharge state causing localization of ion concentration
Solution Approach 1:
The system changes the operating parameters of the secondary battery by monitoring the decision value that reflects ion concentration localization. When the decision value indicates approaching over-discharge, the system adjusts the discharge current limits and switches to fuel cell-powered charging, dynamically changing battery operating conditions to prevent performance degradation
Data Source
AI summary
A fuel cell system includes a power supply circuit that supplies electric power from a fuel cell and a secondary battery to the load and charges the secondary battery with electric power from the fuel cell. A decision value acquirer monitors a charge-discharge state of the secondary battery and obtains a decision value that is used to determine a degree of localization of an ion concentration in an electrolytic solution in the secondary battery. When the decision value becomes equal to or greater than a predetermined reference value, a controller limits discharge of the secondary battery. When the decision value is equal to or greater than the reference value and the required power decreases, the controller limits a decrease in output power of the fuel cell and causes the secondary battery to be charged with the electric power corresponding to the limitation imposed on the decrease in output power.