Battery Charging Control for Deterioration Estimation Accuracy
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Solution Overview
Problem
Conventional technologies do not adequately improve the estimation accuracy of secondary battery deterioration states, which is crucial for effective battery management in vehicle-to-grid systems.
Innovation Solution
A control device and system that detects the start of battery deterioration and controls charging/discharging rates within specific predetermined ranges to enhance estimation accuracy, using a detection unit and control unit to manage the secondary battery's state of charge between 50% and 80% when connected to an external power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If charging rate is not controlled within specific ranges, then charging/discharging operations are simple, but estimation accuracy of deterioration state is insufficient
Solution Approach 1:
The patent applies parameter changes by controlling the charging rate within a specific range (10% to 90% state of charge) during deterioration state derivation. This parameter control ensures that the battery operates in an optimal range for accurate deterioration measurement, resolving the contradiction between measurement precision and operational simplicity.
2Measurement precision
If charging rate is controlled to improve deterioration estimation, then estimation accuracy improves, but battery may experience premature degradation
Solution Approach 1:
The patent carefully selects the charging rate parameter range (10% to 90% state of charge) that balances two competing requirements: achieving sufficient voltage change for accurate deterioration estimation while avoiding extreme charging rates that would cause premature battery degradation. This optimized parameter range resolves the contradiction between measurement accuracy and battery reliability.
Solution Approach 2:
The control device monitors the actual charging rate and adjusts it to maintain operation within the optimal range for deterioration derivation. This feedback mechanism ensures that the battery charging process remains within safe boundaries that prevent degradation while maintaining estimation accuracy.
3Measurement precision
If conventional charging methods are used, then charging operations are simple, but voltage change with respect to charging rate change is insufficient for accurate deterioration derivation
Solution Approach 1:
The patent modifies the charging rate parameter to operate within a specific state of charge range (10% to 90%) that maximizes voltage change sensitivity. This parameter optimization ensures that small changes in charging rate produce measurable voltage changes, improving deterioration derivation accuracy while maintaining relatively simple charging operations.
Data Source
AI summary
A control device that controls charging/discharging of a secondary battery mounted on a vehicle includes: a detection unit configured to detect start of deriving of a deterioration state of the secondary battery; and a control unit configured to control charging/discharging of the secondary battery such that a charging rate of the secondary battery is equal to or higher than a first predetermined value and equal to or lower than a second predetermined value in a state in which the vehicle is parked and is connected to an external power supply in a case in which start of deriving of the deterioration state has been detected by the detection unit.