Battery Discharge Voltage Control for Aging Capacity Recovery
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Solution Overview
Problem
Lithium-ion secondary batteries experience a decrease in battery capacity due to deterioration, and existing control methods fail to effectively manage this without causing further deterioration.
Innovation Solution
A power storage device control system that adjusts the lower limit voltage based on the deterioration state of the battery, specifically by lowering it to a value where the positive or negative electrode potential falls outside the range of rapid deterioration, thereby maintaining usable capacity without further degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lower limit voltage is maintained at the original level to prevent deterioration, then the battery life is preserved, but the available power storage capacity decreases due to deterioration
Solution Approach 1:
The patent applies dynamics by making the lower limit voltage adjustable rather than fixed. The control apparatus dynamically changes the lower limit voltage based on the battery's deterioration state, allowing the voltage threshold to adapt as the battery ages. This enables the system to maintain optimal performance by lowering the voltage threshold when deterioration is detected, thereby increasing available capacity while still preventing further degradation through controlled operation within the new voltage range.
Solution Approach 2:
The patent directly changes the voltage parameter (lower limit voltage) based on the battery's state of health. By monitoring deterioration and adjusting the lower limit voltage threshold accordingly, the system transforms a static parameter into a dynamic one that optimizes both capacity utilization and battery protection. This parameter change allows the battery to operate in a wider voltage range suitable for its current condition, maximizing available capacity without causing harmful effects.
2Quantity of substance
If the lower limit voltage is lowered to increase available capacity, then the power storage capacity increases, but the battery may suffer further deterioration
Solution Approach 1:
The patent implements feedback control by continuously monitoring the battery's deterioration state and using this information to adjust the lower limit voltage. The control apparatus receives feedback about battery health and dynamically modifies the voltage threshold to optimize capacity while preventing deterioration. This closed-loop control ensures that the lower limit voltage is only lowered when and how much is safe, based on real-time battery condition assessment.
Solution Approach 2:
The system makes the lower limit voltage dynamic rather than static, allowing it to change based on battery condition. This dynamic adjustment enables the system to increase available capacity by lowering the voltage threshold when the battery can tolerate it, while automatically preventing further deterioration by maintaining appropriate voltage limits when the battery is more vulnerable.
3Use of energy by moving object
If the lower limit voltage is lowered to utilize more capacity, then the energy utilization improves, but the control complexity increases
Solution Approach 1:
The patent applies self-service by enabling the battery management system to automatically monitor its own deterioration state and autonomously adjust the lower limit voltage without external intervention. The control apparatus uses built-in sensors and algorithms to assess battery health and make appropriate voltage threshold adjustments, eliminating the need for complex external control systems or manual calibration while maximizing energy utilization.
Data Source
AI summary
To provide a power storage device control apparatus, a power storage device control system, and a power storage device control method that can increase the available power storage capacity (battery capacity) of a deteriorated power storage device such as a secondary battery without causing further deterioration of the power storage device. A battery control apparatus of an embodiment includes a controller. The controller lowers a lower limit voltage of discharge of a power storage device to a value in a range where a positive electrode potential of the power storage device is more than a first threshold or to a value in a range where a negative electrode potential of the power storage device is less than a second threshold, based on a deterioration state of the power storage device.