Battery State-of-Charge Control Based on Degradation Estimation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Secondary batteries tend to degrade more easily when maintained at a high charge state for an extended period, making it undesirable to keep them in such a state for too long.
Innovation Solution
A secondary battery management system that sets a temporary target state of charge based on a target power amount and corrects it according to the battery's degradation degree, estimated by measuring the state of charge change over a constant-current charging period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the secondary battery is maintained at a high charge state to ensure sufficient remaining charge for discharging, then the available power for discharge is improved, but the battery degradation accelerates
Solution Approach 1:
The patent implements dynamic adjustment of the target state of charge based on the battery's degradation degree. The management system continuously monitors the degradation level and dynamically modifies the charging target to prevent excessive high charge states while ensuring sufficient discharge power. This dynamic control resolves the contradiction by adapting the charge state to current battery conditions rather than maintaining a fixed high charge level.
Solution Approach 2:
The patent changes the parameter of target state of charge based on degradation degree. By calculating the degradation degree and using it to adjust the target state of charge parameter, the system optimizes the balance between maintaining sufficient power for discharge and preventing accelerated degradation. The target state of charge is corrected in accordance with the degradation degree to determine the optimal charging level.
2Quantity of substance
If the target state of charge is set high to maximize power storage capacity, then the power storage capability is improved, but the battery life is reduced
Solution Approach 1:
The patent implements a feedback mechanism where the degradation degree is continuously estimated based on state of charge changes during constant-current charging periods. This feedback information is then used to correct the target state of charge, creating a closed-loop control system that adjusts power storage targets based on actual battery health status, thereby extending battery life while maintaining adequate storage capacity.
Solution Approach 2:
The patent performs preliminary estimation of the degradation degree during constant-current charging periods before finalizing the target state of charge. By proactively assessing battery health status and pre-adjusting the target state of charge accordingly, the system prevents excessive charging that would accelerate degradation, thus extending battery life while ensuring sufficient power storage capacity.
Data Source
AI summary
A secondary battery management system, a secondary battery management method and a secondary battery management program for the secondary battery management system, and a secondary battery system with which a target state of charge of a secondary battery can be appropriately set by taking into consideration a degradation degree. A secondary battery management system includes a setting unit configured to set a temporary target state of charge of a secondary battery based on a target power amount, an estimating unit configured to estimate a degradation degree of the secondary battery based on an amount of change in a state of charge of the secondary battery over a predetermined constant-current charging period of the secondary battery, and a calculating unit configured to calculate a target state of charge of the secondary battery by correcting the temporary target state of charge in accordance with the degradation degree.