Lithium Battery Process Capacity Calculation Correction
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Solution Overview
Problem
The existing method for calculating the process capacity of lithium secondary batteries is inconsistent due to temperature dependency, leading to discrepancies between calculated and actual process capacity, especially in mass production scenarios where accurate temperature measurement is challenging.
Innovation Solution
A method that corrects process capacity by subtracting the charge capacity from the discharge capacity, using a regression equation to derive a correction factor that attenuates temperature dependency, and includes a system with a database, analysis, measuring, and calculation units to ensure accurate process capacity calculation at a specific temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple temperature sensors are installed in the chamber to measure average temperature during mass production, then productivity increases, but measurement precision deteriorates due to inability to measure individual battery temperatures
Solution Approach 1:
The patent changes the parameter being measured from temperature directly to capacity, which inherently contains temperature dependency information. By measuring capacity at actual operating temperatures and using this data to derive process capacity, the system avoids the need for separate temperature measurements while maintaining accuracy.
Solution Approach 2:
The patent uses capacity as an intermediary parameter that mediates between temperature and the final process capacity calculation. Instead of measuring temperature and then calculating process capacity, the method measures capacity which already reflects temperature effects, and uses this as the basis for derivation.
2Manufacturing precision
If discharge capacity is used to calculate process capacity with temperature correction, then manufacturing precision improves, but reliability deteriorates due to temperature dependency causing inconsistency between calculated and actual process capacity
Solution Approach 1:
The patent changes from using temperature as a correction parameter to using capacity itself as the primary measurement parameter. By measuring capacity at the actual discharge temperature and using this measured capacity value to derive process capacity, the method eliminates temperature dependency issues while maintaining manufacturing precision.
3Manufacturing precision
If correction equation based on discharge temperature and discharge capacity is used, then manufacturing precision improves, but device complexity increases due to need for multiple sensors and correction calculations
Solution Approach 1:
The patent extracts the temperature dependency information directly from the capacity measurement itself, rather than requiring separate temperature measurement systems and correction calculations. This eliminates the need for multiple temperature sensors and complex correction equations while maintaining manufacturing precision.
Data Source
AI summary
A method for calculating the process capacity at a specific temperature of a lithium secondary battery includes a correction to a process capacity (Q3) at a specific temperature (T2) is performed using a value (Q1−Q2) obtained by subtracting the charge capacity (Q2) at the time of the shipping charge from the discharge capacity (Q1) measured at a discharge temperature (T1). A system for calculating a process capacity of a lithium secondary battery is provided.