Battery Control Device Ion Imbalance Integration
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Solution Overview
Problem
Existing battery control methods excessively restrict discharge based solely on the magnitude relationship between evaluation and target values, leading to insufficient output performance.
Innovation Solution
A control device and method that use a current sensor and controller to detect ion concentration imbalances in nonaqueous secondary batteries, integrating evaluation values with a correction coefficient to adjust the upper limit value, preventing excessive restriction while ensuring required output performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the upper limit value is reduced when the evaluation value exceeds the target value, then deterioration due to high-rate discharge is suppressed, but discharge of the battery is excessively restricted and output performance becomes insufficient
Solution Approach 1:
The patent changes the parameter of upper limit value determination from a simple threshold comparison to a dynamic calculation based on integrated evaluation values and correction coefficients. This allows the upper limit to be adjusted continuously according to actual battery state rather than being rigidly reduced whenever the evaluation exceeds the target, thus maintaining output performance while preventing deterioration.
Solution Approach 2:
The patent implements a feedback mechanism where the controller continuously monitors the evaluation value, integrates it over time, and adjusts the upper limit value accordingly. The integrated value serves as feedback that reflects the cumulative effect of high-rate discharge, allowing the system to respond proportionally rather than reactively, balancing durability and output performance.
2Productivity
If the upper limit value is set to the maximum value when the evaluation value does not exceed the target value, then vehicle dynamic performance is produced as required, but the battery may undergo excessive high-rate discharge causing deterioration
Solution Approach 1:
The patent performs preliminary integration of evaluation values before the upper limit needs to be adjusted. By continuously integrating the evaluation value in advance, the system builds up information about the battery's cumulative stress, allowing it to proactively adjust the upper limit before severe deterioration occurs, thus preventing damage while maintaining performance.
Solution Approach 2:
The patent makes the upper limit value dynamic rather than static. Instead of setting a fixed upper limit or simply switching between maximum and reduced values, the system continuously adjusts the upper limit based on the integrated evaluation value, creating a dynamic control system that adapts to the battery's real-time state and usage patterns.
3Device complexity
If the integrated value is calculated without considering correction coefficients, then the calculation is simple, but the first deterioration component is not properly accounted for leading to excessive restriction
Solution Approach 1:
The patent introduces correction coefficients as adjustable parameters that modify the integrated value calculation. These coefficients allow the system to account for the first deterioration component (ion concentration imbalance) by scaling the evaluation values appropriately, improving evaluation accuracy without making the calculation prohibitively complex.
Data Source
AI summary
A control device that controls discharge of a nonaqueous secondary battery in order that discharge electric power of the nonaqueous secondary battery does not exceed an upper limit value includes a current sensor and a controller. The controller calculates an evaluation value for evaluating a first deterioration component based on a discharge state detected by using the current sensor. The first deterioration component is a component that reduces output performance of the nonaqueous secondary battery due to an imbalance of ion concentrations in an electrolytic solution caused by discharging the nonaqueous secondary battery. The controller integrates a value obtained by subtracting a correction coefficient from a first integrated value obtained by integrating the evaluation values in past, which exceed a target value, and the evaluation value at present, which exceeds the target value, to calculate a second integrated value. When the second integrated value exceeds a threshold value, the controller reduces the upper limit value.