Solid-State Battery Nail Penetration Testing Under Uniform Pressure
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Solution Overview
Problem
Current battery cell test devices are not optimized for all-solid-state batteries, which require pressurization to evaluate safety due to low contact force and high interfacial resistance, and existing devices may not accurately reflect actual usage conditions during penetration testing.
Innovation Solution
A battery cell penetration test apparatus with a pressurizing unit, a penetrating member, and an auxiliary pressing unit formed from insulating resin materials, which applies uniform pressure and measures temperature and voltage changes, ensuring stable and reliable testing of all-solid-state batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing battery cell test devices are used for all-solid-state batteries, then the testing can be performed, but the measurement accuracy is insufficient due to low contact force and high interfacial resistance
Solution Approach 1:
The auxiliary pressing unit is disposed in advance to block the through-hole before the penetration test is performed. This preliminary positioning ensures that pressure is uniformly applied to the battery cell during testing, addressing the low contact force issue by pre-establishing proper mechanical contact between the pressing unit and the cell surface.
Solution Approach 2:
The auxiliary pressing unit acts as an intermediary component between the pressurizing unit and the battery cell. It transfers and distributes the applied pressure uniformly across the cell surface, improving both the contact force reliability and the measurement accuracy by ensuring consistent pressure distribution during the penetration test.
2Reliability
If pressure is applied to evaluate safety of all-solid-state batteries, then safety evaluation is enhanced, but measurement errors increase due to non-uniform pressure distribution
Solution Approach 1:
The auxiliary pressing unit is specifically designed to address the local pressure distribution issue at the through-hole area. By blocking the through-hole and providing localized pressing support, it ensures that pressure is uniformly distributed across the entire battery cell surface, preventing non-uniform pressure concentration that would cause measurement errors while maintaining the necessary pressure for safety evaluation.
3Ease of operation
If a through-hole is provided in the pressurizing unit for penetrating member insertion, then penetration testing is enabled, but pressure uniformity is compromised
Solution Approach 1:
The auxiliary pressing unit serves as a mediator that compensates for the pressure disruption caused by the through-hole. It is positioned to block the through-hole from the battery cell side, ensuring that pressure applied by the pressurizing unit is uniformly distributed across the cell surface despite the presence of the through-hole, thus maintaining pressure uniformity while allowing penetrating member insertion.
Data Source
AI summary
An apparatus of testing an all-solid state secondary battery by nail penetration includes a pressurizing unit pressurizing a battery cell, a penetrating member inserted into a through-hole provided in the pressurizing unit to pass through the battery cell, and an auxiliary pressing unit disposed between the pressurizing unit and the battery cell and transferring pressure applied by the pressurizing unit to the battery cell. The auxiliary pressing unit is disposed between the through-hole and the battery cell in a form to block the through-hole.