Transient and Continuous Deterioration Estimation for Energy Storage
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Solution Overview
Problem
Existing charge-discharge control devices for secondary batteries fail to effectively suppress battery deterioration, particularly due to transient and continuous degradation caused by ion bias and electrolyte depletion during charge-discharge cycles, leading to reduced power performance.
Innovation Solution
A deterioration amount estimation device that calculates and separates transient and continuous deterioration amounts, allowing for input/output limitations to control and suppress continuous deterioration by quantifying transient deterioration and adjusting energy storage device usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If charge-discharge control is performed based only on estimated history (cycle number), then the control device can operate with simple parameters, but the deterioration of the secondary battery cannot be effectively suppressed because current magnitude and other factors are not considered
Solution Approach 1:
The invention segments the total deterioration amount into two distinct components: transient deterioration amount (recoverable) and continuous deterioration amount (permanent). This segmentation allows for differentiated control strategies - transient deterioration can be managed through rest periods while continuous deterioration requires more aggressive usage limitations, thereby improving deterioration suppression effectiveness without requiring complete redesign of the control system
Solution Approach 2:
The invention introduces additional parameters beyond cycle count, specifically current magnitude and time-based recovery characteristics. By monitoring current magnitude during charge-discharge cycles and tracking deterioration over time periods, the system adapts its control strategy based on actual usage patterns, enabling more effective deterioration suppression while maintaining reasonable device complexity
2Productivity
If the energy storage device operates continuously without load limitations, then productivity is maintained, but continuous deterioration increases and reduces the device lifespan
Solution Approach 1:
The invention implements dynamic control by continuously monitoring the calculated deterioration amount and adjusting usage limitations in real-time. When transient deterioration is detected, the system dynamically introduces rest periods; when continuous deterioration approaches thresholds, it progressively limits usage. This dynamic adaptation allows the system to maximize productivity during healthy operation while extending lifespan through targeted interventions
Solution Approach 2:
The system establishes a feedback loop where the calculated deterioration amount (based on current magnitude, cycle history, and time parameters) continuously informs usage limitation decisions. This feedback mechanism enables the system to learn from operational patterns and adjust control strategies to balance productivity maintenance with lifespan extension, preventing both over-utilization and unnecessary restrictions
Data Source
AI summary
A deterioration amount estimation device includes a calculation unit (CPU33) that calculates a deterioration amount of an energy storage device and an estimation unit (CPU33) that estimates a transient deterioration amount based on a deterioration amount calculated by the calculation unit and a continuous deterioration amount that does not decrease with time and continues. The transient deterioration amount is estimated, and the input/output of the energy storage device is limited to suppress an increase in the continuous deterioration amount.