Battery Cell Diagnosis Using Intermittent Electric Stimulation
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Solution Overview
Problem
Existing battery diagnosis methods face challenges in accurately and efficiently determining the internal state of a battery cell due to polarization issues caused by high-level electric stimulation, which compromises diagnostic accuracy and prolongs the time required for obtaining full-cell profiles.
Innovation Solution
A battery diagnosis method and apparatus that employs an intermittent application procedure of electric stimulation, alternating between application and removal, to reduce polarization and efficiently generate diagnostic information on charge/discharge performance by analyzing the correspondence between capacity and voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-level electric stimulation is applied to obtain full-cell profile quickly, then productivity is improved, but measurement precision deteriorates due to severe polarization phenomenon
Solution Approach 1:
executing an intermittent application procedure of electric stimulation in which application and removal of electric stimulation are alternately repeated
2Measurement precision
If low-level electric stimulation is applied to minimize polarization, then measurement precision is improved, but productivity deteriorates due to excessive time required
Solution Approach 1:
The patent resolves this contradiction by using periodic action to switch between high-level stimulation (for speed) and rest periods (for precision). Instead of continuously applying low-level stimulation, the system periodically applies high-level stimulation followed by rest periods, thereby achieving both objectives: fast data acquisition during application periods and reduced polarization during rest periods
Solution Approach 2:
The patent applies preliminary action by conducting a preliminary full-cell profile measurement using low-level electric stimulation to establish baseline relationship data between capacity and voltage. This preliminary measurement ensures diagnostic accuracy is maintained while the subsequent intermittent high-level stimulation procedure accelerates the overall process
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
This approach allows for high-level electric stimulation without compromising diagnostic accuracy, reducing the time needed to obtain relationship data, and providing detailed diagnostic information on battery cell performance.
Implementation Method 1
polarization (or overpotential) that causes a decrease in diagnostic accuracy
Data Source
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AI summary
Disclosed is a battery diagnosis method and a battery diagnosis apparatus. The battery diagnosis method includes performing an intermittent application procedure of electric stimulation to a battery cell, obtaining state history data of the battery cell corresponding to a state change period until an electric state of the battery cell reaches a second state from a first state, generating a measurement full-cell profile representing a correspondence between a capacity and a voltage of the battery cell based on the state history data, and generating first diagnostic information including at least one diagnostic factor related to charge/discharge performance of the battery cell by analyzing the measurement full-cell profile.