Battery Cell Defect Detection Using Constant-Voltage Current Measurement
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Solution Overview
Problem
Existing methods for detecting defective battery cells are time-consuming and require significant space, as they rely on voltage drop measurements over extended periods, making them inefficient for mass production and quality control.
Innovation Solution
An apparatus and method that measures electric current discharged from the battery cell to detect defects by maintaining a constant voltage, using a charger, measurement part, and controller to determine defects based on current magnitude and comparison with normal battery cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage drop measurement method is used to detect defective battery cells, then defect detection capability is achieved, but detection time is extended and space requirements increase
Solution Approach 1:
The patent changes the measurement parameter from voltage drop to current measurement. By measuring the current discharged from the battery cell during a rest period after charging, the system can detect defects much faster. The current magnitude directly reflects internal resistance changes caused by defects, eliminating the need for long-term voltage monitoring.
Solution Approach 2:
The patent replaces the time-consuming voltage drop measurement method with an electrical current measurement approach. This substitution allows for rapid detection by measuring current at a specific state of charge (20-40%) after a short rest period, rather than monitoring voltage over extended periods.
2Measurement precision
If voltage drop measurement method is used to detect defective battery cells, then defect detection capability is achieved, but required storage space increases
Solution Approach 1:
The patent changes the measurement parameter from voltage drop to current measurement. By measuring the current discharged from the battery cell during a rest period after charging, the system can detect defects much faster. The current magnitude directly reflects internal resistance changes caused by defects, eliminating the need for long-term voltage monitoring.
3Loss of time
If current measurement method is used to detect defective battery cells, then detection time is reduced, but measurement precision must be maintained
Solution Approach 1:
The patent applies preliminary actions by first charging the battery cell to a specific state of charge (20-40%) and then allowing it to rest for a predetermined period before measurement. This preparation ensures that the current measurement reflects the true internal state of the cell, improving detection accuracy while maintaining rapid testing.
Solution Approach 2:
The system uses feedback by comparing the measured current magnitude against reference values or historical data from normal battery cells. This comparison enables accurate defect detection by identifying deviations from expected current behavior, ensuring high measurement precision despite the rapid testing approach.
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 detects defective battery cells with high precision in a shorter timeframe and reduced space, improving efficiency in manufacturing processes.
Implementation Method 1
a charger for supplying current to cause a battery cell to maintain a constant voltage
Implementation Method 2
a measurement part for measuring the voltage and current of the battery cell
Data Source
AI summary
An apparatus and method for detecting a defective battery cell is proposed. The proposed apparatus includes a charger for supplying current to cause a battery cell to maintain a constant voltage, a measurement part for measuring the voltage and current of the battery cell, and a controller for determining whether a defect exists in the battery cell on the basis of the current measured by the measurement part, whereby the defective battery cell may be detected with high accuracy, a time required for the detection may be shortened, and a space required for the detection may also be reduced.