Solid-State Battery Over-Discharge for Short-Circuit Screening
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Solution Overview
Problem
Conventional solid-state battery manufacturing methods are inefficient in quickly identifying and preventing the release of defective products due to short-circuiting, which can occur when a metal component reacts with sulfur in the sulfide electrolyte layer, leading to battery degradation and performance deterioration during prolonged high-temperature aging processes.
Innovation Solution
The method involves over-discharging the solid-state battery by applying a voltage of less than −0.5 V in a controlled temperature range of 25° C to 150° C, specifically 60° C to 85° C, to accelerate the diffusion of sulfide components and detect short-circuiting before shipping, thereby reducing battery deterioration and identifying defective products quickly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional heating processing over a long time is used to confirm short-circuiting, then the presence of sulfide formation can be detected, but the process takes too long and defective products cannot be quickly identified before shipping
Solution Approach 1:
The patent changes the detection parameter from thermal aging (heating over long time) to electrochemical over-discharging. By applying a constant current to over-discharge the battery, the detection method transitions from time-dependent thermal processes to current-dependent electrochemical reactions, enabling rapid detection of short-circuiting within minutes rather than hours or days.
Solution Approach 2:
The patent replaces the mechanical/thermal aging system with an electrochemical over-discharging system. Instead of using heat and time to accelerate sulfide formation and detection, the invention uses controlled over-discharge currents to directly trigger and detect short-circuit conditions, substituting thermal-mechanical processes with electrical processes that are faster and more direct.
2Reliability
If prolonged high-temperature aging is applied to detect short-circuiting, then defective products can be identified, but battery deterioration increases and performance deteriorates
Solution Approach 1:
The patent changes the detection parameter from high-temperature thermal aging to controlled electrochemical over-discharging. This parameter change allows detection of short-circuiting through electrical behavior rather than thermal acceleration, significantly reducing the energy input and thermal stress applied to the battery, thereby preserving battery performance while maintaining detection reliability.
Solution Approach 2:
The patent converts the potential harm of over-discharging (which could damage batteries) into a beneficial detection mechanism. By carefully controlling the over-discharge process, the invention uses the over-discharge condition itself as a diagnostic tool - the controlled stress reveals hidden defects (short-circuiting) without causing permanent damage, turning a potentially harmful process into a quality assurance benefit.
3Reliability
If conventional aging processes are used, then short-circuiting can be detected, but the process complexity and manufacturing time increase
Solution Approach 1:
The patent changes the detection parameter from time-intensive thermal aging to rapid electrochemical over-discharging. This parameter transformation reduces the detection process from hours or days to minutes, directly improving manufacturing throughput and productivity while maintaining the reliability of defective product identification.
Solution Approach 2:
The patent performs the detection action (over-discharging) immediately after battery assembly, before shipping and final quality checks. This preliminary detection action identifies potential short-circuiting defects early in the manufacturing process, preventing defective products from progressing further and enabling immediate corrective action, thereby improving overall manufacturing efficiency.
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 the rapid confirmation of short-circuiting and prevention of defective product release, reducing battery deterioration and ensuring the quality of solid-state batteries by diffusing foreign metals in a controlled manner, thus preventing short-circuiting and maintaining battery performance.
Implementation Method 1
over-discharging the solid-state battery... to accelerate the diffusion of sulfide components and detect short-circuiting
Data Source
AI summary
A method of manufacturing a solid-state battery, the method including: over-discharging the solid-state battery having a solid sulfide electrolyte layer.