Battery Storage Unit Power Limiting by Abnormality Level
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Solution Overview
Problem
Existing electricity storage systems face challenges in safely supplying maximum electric power to a load even when abnormalities occur in individual battery modules or units, potentially leading to safety risks.
Innovation Solution
An electricity storage system with multiple connected units, each comprising a battery pack, contactor, and controller, which determines abnormalities and limits power supply in a stepwise manner based on the severity of the abnormality to ensure safe and efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the system continues to supply maximum electric power to the load even when abnormalities occur in battery modules, then the productivity and power supply capability are maintained, but the safety and reliability of the system deteriorate
Solution Approach 1:
The patent implements dynamic power supply adjustment by continuously monitoring battery module states and adapting the power supply level accordingly. When abnormalities are detected, the system dynamically reduces power supply to affected modules while maintaining operation of normal modules, thus balancing productivity and safety requirements
Solution Approach 2:
The patent divides the electricity storage system into multiple independent battery modules, each with individual monitoring and control capability. This segmentation allows the system to isolate and manage abnormalities at the module level rather than system-wide, maintaining power supply from healthy modules while protecting faulty ones
2Reliability
If the system completely stops power supply when abnormalities occur in electricity storage units, then the safety is ensured, but the productivity and power supply continuity deteriorate
Solution Approach 1:
The system segments the electricity storage units into multiple independent modules, allowing selective power supply interruption only to affected modules rather than the entire system. This enables continued operation of healthy modules, maintaining power supply continuity while ensuring safety
Solution Approach 2:
The patent changes the power supply parameter dynamically based on abnormality detection results. Instead of binary on/off control, the system adjusts power supply levels proportionally to the severity and location of abnormalities, maintaining optimal power distribution for safety and continuity
3Productivity
If the system supplies maximum power without distinguishing abnormality levels, then the productivity is maintained, but the harmful effects and safety risks increase
Solution Approach 1:
The patent applies different power supply strategies to different battery modules based on their individual states. Healthy modules continue to supply maximum power, while modules with abnormalities receive reduced or zero power supply. This localized quality control minimizes safety risks while maintaining overall productivity
Data Source
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AI summary
An electricity storage system includes a load and multiple electricity storage units connected to the load. Each of the electricity storage units is connected to the load and includes a battery pack including multiple battery cells, a contactor provided between the battery pack and the load, and a controller. The controller includes a determination controller that determines whether an abnormality has occurred in the electricity storage unit and a supply limiting controller that, when it is determined by the determination section that an abnormality has occurred in the electricity storage unit, limits a maximum amount of electric power that is supplied to the load in a stepwise manner in accordance with a level of the abnormality of the electricity storage unit.