Battery Charging Voltage Control Using Predicted Capacity
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Solution Overview
Problem
Storage batteries deteriorate quickly when maintained in a high voltage state during constant voltage charging, especially due to varying temperature conditions, which affects their lifespan and reliability.
Innovation Solution
A storage battery control device that calculates a predicted battery capacity using a digital model simulating the battery's operation and deterioration characteristics, allowing for adaptive control of the charging voltage to maintain optimal conditions and prolong battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If constant voltage charging mode is used to maintain full charge, then the battery remains charged and ready for use, but the battery deteriorates quickly due to high voltage stress
Solution Approach 1:
The patent applies dynamics by transitioning from a static constant voltage charging mode to a dynamic charging mode that continuously adjusts voltage based on predicted battery capacity. The control device calculates predicted capacity at future time points and modifies charging voltage accordingly, making the charging process adaptive rather than fixed, thereby reducing voltage stress while maintaining charge readiness.
Solution Approach 2:
The patent changes the voltage parameter dynamically during charging based on predicted battery capacity at future time points. Instead of maintaining a fixed high voltage, the system adjusts the voltage parameter according to calculated capacity predictions, reducing the harmful high voltage stress that causes rapid deterioration while ensuring the battery remains adequately charged.
2Productivity
If high voltage is applied during constant voltage charging, then charging efficiency is maintained, but temperature-related deterioration increases
Solution Approach 1:
The patent changes the voltage parameter based on predicted capacity and temperature conditions. By adjusting voltage dynamically rather than maintaining constant high voltage, the system reduces temperature-related stress on the battery while preserving adequate charging efficiency. The control device incorporates temperature as a factor in its capacity prediction and voltage adjustment algorithm.
Solution Approach 2:
The patent implements feedback by using predicted battery capacity information to adjust charging voltage. The control device calculates predicted capacity at future time points and uses this information to modify charging parameters, creating a closed-loop system that responds to battery state predictions, thereby reducing harmful thermal effects while maintaining charging performance.
3Measurement precision
If deterioration prediction is performed using actual deterioration rate and master curves, then battery lifespan can be estimated, but the control system becomes complex
Solution Approach 1:
The patent uses copying by creating a virtual model (digital twin) of the battery's deterioration behavior through master curves. Instead of complex real-time monitoring and analysis, the system uses pre-established deterioration patterns that can be applied to predict future capacity, simplifying the control logic while maintaining prediction accuracy. The master curves serve as simplified representations of complex deterioration phenomena.
Data Source
AI summary
A storage battery control device includes a hardware processor functioning as an acquisition unit, a first calculation unit, and a control part. The acquisition unit acquires operation conditions of a storage battery system including a storage battery being chargeable and dischargeable. The first calculation unit calculates, as a first predicted value, a battery capacity of the storage battery in a predetermined period on the basis of the operation conditions acquired by the acquisition unit. The battery capacity corresponds to a case where the storage battery is operated under the operation conditions. The control part controls a charging voltage when the storage battery system charges the storage battery. The charging voltage is controlled on the basis of the first predicted value calculated by the first calculation unit.