Rechargeable Battery Economic Efficiency Estimation Using Voltage Difference
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Solution Overview
Problem
Existing methods for estimating the economic efficiency of lithium ion batteries cannot accurately assess the charge/discharge curve and economic merit, leading to insufficient management of battery degradation and efficiency.
Innovation Solution
An economic efficiency estimation apparatus and method that calculates an economic efficiency index (SOEc) using a voltage difference between discharge voltage and charge maximum voltage, along with charge/discharge energy quantities, to estimate full-charge capacity and energy quantities, and correlate these with electricity rates in different time zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If residual capacity estimation methods using impedance or voltage difference are used, then residual capacity can be estimated without measuring discharge capacities, but the charge/discharge curve itself cannot be estimated
Solution Approach 1:
The patent pre-calculates and stores the relationship between voltage differences and charge/discharge curves before actual use. When estimating economic efficiency, the system only needs to measure the current voltage difference and retrieve the corresponding pre-calculated curve data, avoiding time-consuming real-time curve calculations while maintaining high accuracy
Solution Approach 2:
The patent introduces voltage difference as an intermediary parameter that connects measurable quantities (voltage at specific time points) with the desired output (charge/discharge curve). By using voltage difference measured at predetermined time points after discharge start as a mediator, the system can accurately determine the corresponding charge/discharge curve without directly measuring the entire curve
2Ease of operation
If only degradation state is judged generally, then it is simple to assess battery status, but the accuracy of economic efficiency estimation is insufficient
Solution Approach 1:
The patent transforms the general degradation state assessment into a precise economic efficiency estimation by changing the assessment parameter from qualitative degradation levels to quantitative economic efficiency indices. The system calculates specific parameters including charge/discharge energy quantities, voltage differences at predetermined time points, and economic efficiency values, providing both simplicity and accuracy
3Measurement precision
If charge/discharge energy quantities and voltage differences are measured to estimate economic efficiency, then accurate economic efficiency index can be obtained, but the measurement and calculation process becomes more complex
Solution Approach 1:
The patent pre-calculates and stores the relationship between voltage differences and charge/discharge curves in advance. During actual economic efficiency estimation, the system only needs to measure voltage at specific time points, calculate the voltage difference, and retrieve the corresponding pre-stored curve data, significantly reducing real-time computational complexity while maintaining high accuracy
Solution Approach 2:
The patent measures voltage at specific predetermined time points after discharge start rather than continuously monitoring the entire discharge process. This partial measurement approach captures sufficient information to determine voltage difference and retrieve the corresponding charge/discharge curve, reducing measurement and calculation complexity while maintaining estimation accuracy
Data Source
AI summary
The economic efficiency estimation apparatus of the rechargeable battery and the economic efficiency estimation method thereof according to the present invention estimate an economic efficiency index correlated with a full-charge capacity and a charge/discharge energy quantity of a secondary battery, by using a voltage difference between a discharge voltage, which is precalculated, and a charge maximum voltage.