All Solid State Battery Short Circuit Detection via Resistance Increase
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Solution Overview
Problem
Existing methods for detecting short circuits or defects in all solid state batteries, such as foreign substances, are challenging due to the characteristics of solid electrolytes, which hinder the application of voltage-based detection techniques used in liquid-based batteries.
Innovation Solution
A method involving a resistance increasing step, where the battery's resistance is elevated through freezing treatment or reduced confining pressure, followed by a voltage application step to measure current values, allowing for accurate detection of short circuits or defects by judging the acceptability based on current ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage is applied to an all solid state battery to detect short circuit, then detection can be performed, but the solid electrolyte characteristics prevent accurate detection of minute short circuits
Solution Approach 1:
The patent changes the temperature parameter of the all solid state battery to increase its resistance. By cooling the battery to low temperatures (e.g., -40°C or lower), the resistance of the solid electrolyte increases significantly, which amplifies the effect of any short circuits and enables accurate detection through voltage application and current measurement.
2Measurement precision
If the battery resistance is increased to improve detection accuracy, then minute short circuits can be detected, but additional treatment steps are required
Solution Approach 1:
The patent utilizes the phase transition effect of the solid electrolyte resistance with temperature. By transitioning the battery to a low-temperature state, the resistance naturally increases, enabling detection without requiring additional complex equipment or procedures beyond standard temperature control and electrical measurement capabilities.
3Ease of operation
If a simple voltage application method is used, then the testing process is simple, but it cannot detect minute short circuits in all solid state batteries
Solution Approach 1:
The patent maintains the simplicity of the voltage application method while improving detection capability by changing the temperature parameter. The same basic electrical measurement setup is used, but the battery is cooled to increase resistance, which enhances the detectability of minute short circuits without requiring complex additional equipment or procedures.
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 method enables high-accuracy detection of short circuits and defects in all solid state batteries, ensuring higher safety and reliability by inhibiting internal reactions and utilizing specific resistance and voltage conditions to assess battery integrity.
Implementation Method 1
the resistance of the all solid state battery may be increased by a freezing treatment in the resistance increasing step
Implementation Method 2
a resistance increasing step of increasing resistance of an all solid state battery to 3.2×105 Ω·cm2 or more
Data Source
AI summary
A method for testing an all solid state battery with which the presence of short circuit or the presence of defect causing short circuit can be detected with high accuracy by a method in which a voltage is applied to a battery and the current value thereof is measured. The method includes the steps of: a resistance increasing step of increasing resistance of an all solid state battery to 3.2*105 Ω·cm2 or more; a voltage applying step of applying voltage to an all solid state battery of which the resistance is increased; and a judging step of judging acceptability of the all solid state battery based on a current value measured in the voltage applying step.