Lithium-Ion Battery Reuse Screening for Potential Nonuniformity
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Solution Overview
Problem
Lithium-ion batteries experience degradation due to nonuniformity of potentials in the electrode plane, which can remain even after high-rate degradation mitigation processing, leading to inaccurate degradation recognition and reduced battery life when reused.
Innovation Solution
A battery processing system that includes a control device which acquires an indicator value for lithium-ion concentration distribution degradation and executes specific elimination processing when thresholds are exceeded, including over-discharge to address potential nonuniformity, ensuring both concentration and potential-related degradations are mitigated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If simple degradation threshold processing is applied, then processing complexity is low, but degradation recognition accuracy is insufficient
Solution Approach 1:
The patent applies different threshold values (first threshold value for concentration degradation, second threshold value for potential degradation) and different elimination processing strategies to different degradation types. This localized approach ensures each degradation mechanism is addressed with appropriate precision while maintaining overall processing efficiency.
2Productivity
If battery is used without elimination processing, then productivity is high, but battery life is reduced
Solution Approach 1:
The patent implements periodic elimination processing during battery operation based on indicator value thresholds. The control device monitors degradation indicators and executes elimination processing at appropriate intervals when thresholds are exceeded, balancing continuous battery usage with periodic maintenance to extend battery life without significantly impacting productivity.
Data Source
AI summary
A control device executes processing including: executing first elimination processing when there is a history of addition of degradation indicator values ΣD and also when degradation indicator value ΣD is larger than a first threshold value TH1; measuring a characteristic value of a cell; executing second elimination processing; determining reusability when the characteristic value is within an allowable range; determining unreusability when the characteristic value is out of the allowable range; and executing the second elimination processing when degradation indicator value ΣD is first threshold value TH1 or less.