Battery Demand Control Using Deterioration Threshold Feedback
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Solution Overview
Problem
Secondary batteries, such as lithium-ion batteries, experience high-rate deterioration due to salt concentration unevenness in the electrolyte solution, which can be accelerated by excessive charging and discharging, leading to increased internal resistance and reduced efficiency.
Innovation Solution
An electric power demand adjusting device that acquires evaluation values for high-rate deterioration and controls the participation of secondary batteries in charge and discharge demands based on predetermined threshold values to prevent excessive charging or discharging, thereby reducing the risk of high-rate deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the secondary battery is repeatedly charged and discharged to adjust power demand in the power utility grid, then the productivity and energy management efficiency are improved, but the high-rate deterioration is accelerated due to salt concentration unevenness in the electrolyte solution
Solution Approach 1:
The control device acquires evaluation values indicating the degree of salt concentration unevenness in the electrolyte solution and uses this feedback information to dynamically adjust charging and discharging control. When the evaluation value exceeds a threshold, the control device restricts further charging or discharging operations, preventing excessive deterioration while allowing normal power demand adjustment when conditions are favorable.
Solution Approach 2:
The system changes the operational parameters (charging/discharging rates and limits) based on the evaluated salt concentration unevenness level. By adjusting these parameters according to real-time battery state assessment, the system optimizes the balance between productivity (power adjustment capability) and reliability (battery durability).
2Reliability
If the secondary battery is allowed to participate in discharge demand adjustment without restrictions, then the power utility grid stability is improved, but the internal resistance increases due to excessive discharging and salt concentration unevenness
Solution Approach 1:
The control device continuously monitors the evaluation value of salt concentration unevenness and uses this feedback to determine whether to allow or restrict discharge operations. This closed-loop control ensures that the battery participates in grid stabilization only when the salt concentration distribution is within acceptable ranges, preventing harmful internal resistance increases.
3Productivity
If the secondary battery is charged without considering the evaluation value, then the charge demand adjustment is improved, but the high-rate deterioration is accelerated due to excessive charging states
Solution Approach 1:
The control device performs preliminary assessment of the battery state by acquiring evaluation values before initiating charging operations. Based on this preliminary evaluation, the system determines whether the battery is suitable for charging, preventing excessive charging that would accelerate deterioration while still enabling charge demand adjustment when conditions are appropriate.
Data Source
AI summary
An electric power demand adjusting device is configured to execute an acquiring process of acquiring an evaluation value ΣD for a high-rate deterioration of a secondary battery connected to a power utility grid, which results from a salt concentration unevenness in an electrolyte solution, and a discharge non-participating process of not allowing the secondary battery to participate in adjustment of discharge demand from the power utility grid when the evaluation value ΣD of the secondary battery is greater than or equal to a predetermined discharge threshold value K1.