Battery Module Re-arrangement for Performance Consistency
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Solution Overview
Problem
The performance of secondary battery systems deteriorates over time due to variability in utilization conditions and individual differences among battery modules, leading to uneven deterioration speeds, which affects the overall system performance.
Innovation Solution
A secondary battery system with a battery controller that inspects the deterioration status of each module, ranks them based on their characteristics, and re-arranges them within the same cabinet to minimize variability, thereby maintaining system performance by optimizing the series connection configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If battery modules are arranged in series connection configuration, then the system voltage and energy storage capacity are improved, but the performance variability among modules causes uneven deterioration speeds leading to overall system performance degradation
Solution Approach 1:
The patent applies local quality by arranging battery modules with similar deterioration characteristics (performance levels) in the same series connection group. Instead of uniform treatment, the system inspects individual module characteristics and creates localized groups where each group contains modules with comparable performance states, thereby ensuring more uniform current distribution and reducing uneven deterioration within each series group.
Solution Approach 2:
The patent implements dynamics through periodic re-inspection and re-arrangement of battery modules. The system dynamically adjusts the arrangement of modules based on their changing deterioration characteristics over time. Modules are re-inspected at predetermined intervals and re-arranged into appropriate series connection groups according to their current performance levels, allowing the system to adapt to evolving module characteristics and maintain performance consistency throughout the operational lifecycle.
2Device complexity
If battery modules with different deterioration characteristics are kept in the same series connection group, then the arrangement complexity is reduced, but the variability in deterioration speeds accelerates overall system performance deterioration
Solution Approach 1:
The patent applies preliminary action by inspecting and arranging battery modules into appropriate series connection groups before operational issues arise. The system performs initial characteristic inspection and arranges modules with similar performance levels into the same series groups at the outset, preventing the development of significant performance variability. This proactive approach avoids the need for complex real-time management while maintaining system reliability.
Solution Approach 2:
The patent implements feedback through periodic re-inspection of battery module characteristics and comparison with predetermined performance levels. The system continuously monitors module states, compares them against reference levels, and triggers re-arrangement actions when performance deviations are detected. This feedback mechanism enables the system to maintain appropriate module groupings without requiring complex continuous management, balancing simplicity with reliability.
3Reliability
If frequent inspection and re-arrangement of battery modules is performed, then the system performance is maintained, but the operation time and system complexity increase
Solution Approach 1:
The patent applies periodic action by conducting battery module inspections and re-arrangements at predetermined time intervals or after a specified number of charge-discharge cycles. Instead of continuous monitoring and adjustment, the system performs inspections periodically, comparing module characteristics against reference levels established at initial inspection. This periodic approach maintains system performance while minimizing the time and operational disruption associated with inspections and re-arrangements.
Data Source
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AI summary
A secondary battery system and a method of arranging battery modules which are capable of recovering the system performance and maintaining the system performance in the long term is provided. A secondary battery system 10 includes a battery cabinet group including a plurality of battery cabinets 2 each comprising a plurality of battery modules 1 connected to each other, the battery module being a replacement unit, a PCS 3 connected to the battery cabinet group and is controlling charging and discharging thereof, and a battery controller 7 connected to the PCS. The battery controller 7 includes a deterioration inspecting block obtaining a characteristic of each of the battery modules to inspect a deterioration status thereof, a numbering block numbering each of the battery modules in an order from a small deterioration to a large deterioration based on the characteristic obtained by the deterioration inspecting block, and a re-arrangement determining block determining a re-arrangement position of each of the battery modules in such a way that numbers given by the numbering block are in sequence in the same battery cabinet.