Anode-Free Lithium Battery SOH Estimation Using Post-Discharge OCV
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for estimating the state of deterioration and service life of secondary batteries with a negative electrode free of a negative electrode active material are inaccurate and complex, lacking a simple and effective estimation method.
Innovation Solution
A state-of-deterioration estimating device that measures post-discharge open circuit voltage (OCV) and correlates it with a predetermined deterioration index to calculate the state of health (SOH) of the battery, using characteristic information to simplify the estimation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods are used to estimate deterioration state, then estimation can be performed, but calculation process becomes complex and accuracy is impeded
Solution Approach 1:
The patent extracts the key relationship between OCV and deterioration index from complex battery degradation models. By focusing only on the open circuit voltage measurement and its direct correlation with deterioration index, the method eliminates the need for complex multi-parameter calculations while maintaining estimation accuracy.
Solution Approach 2:
The patent changes the measurement parameter from complex multi-parameter monitoring to simple OCV measurement. By using open circuit voltage as the sole measurement parameter and establishing its direct relationship with deterioration index, the method simplifies the estimation process while improving accuracy through proper parameter selection.
2Measurement precision
If conventional lithium ion battery estimation methods are used, then some estimation can be obtained, but it is not easy to estimate deterioration state accurately
Solution Approach 1:
The patent enables the battery to self-indicate its deterioration state through OCV measurement. The open circuit voltage naturally reflects the battery's health status without requiring external complex testing or multiple measurements, making the estimation process as simple as taking a single voltage reading.
3Measurement precision
If no specific method is used for anode-free lithium batteries, then general battery estimation can be applied, but accurate deterioration and service life estimation is not achievable
Solution Approach 1:
The patent creates a universal estimation method that works specifically for anode-free lithium batteries by establishing the OCV-deterioration index relationship. This single measurement approach serves multiple functions: estimating deterioration state, predicting service life, and simplifying the estimation configuration, making it broadly applicable to this battery type.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Accurately estimates the state of deterioration and service life of secondary batteries with a negative electrode free of a negative electrode active material using a simple configuration, reducing calculation complexity and improving estimation accuracy.
Implementation Method 1
an acquiring unit that acquires a post-discharge OCV that is an open circuit voltage (OCV) in the state after a predetermined amount of time or more has elapsed since the discharge was stopped
Data Source
AI summary
It is an object of the present invention to accurately estimate the state of deterioration and service life of a secondary battery having a negative electrode free of a negative electrode active material using a simple configuration. One aspect of the present invention is a state-of-deterioration estimating device in a secondary battery having a negative electrode free of a negative electrode active material, the state-of-deterioration estimating device comprising: an acquiring unit that acquires a post-discharge OCV that is an open circuit voltage (OCV) in the state after a predetermined amount of time or more has elapsed since the discharge was stopped; a calculating unit that calculates the state of deterioration of the secondary battery based on the acquired post-discharge OCV by referencing characteristic information indicating the change in a predetermined deterioration index that indicates the degree of deterioration in the secondary battery relative to the change in the post-discharge OCV of the secondary battery; and an output unit that outputs the state of deterioration that has been calculated.