Soft Package Battery Compression Testing for Defect Detection
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Solution Overview
Problem
Current battery test methods, such as the UL 1642 impact test, are too stringent for soft package batteries and do not accurately reflect real-world usage conditions, failing to effectively assess the safety performance and identify defects that could lead to safety risks like short circuits, heat generation, and fires during mechanical damage.
Innovation Solution
A battery test system comprising an extrusion apparatus with a chamfered surface and a pressure apparatus that applies a predetermined force to simulate real-world mechanical stress on the battery, allowing for the collection of temperature and voltage data to assess safety and detect defects, which is more relevant to the actual usage scenarios of soft package batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UL 1642 impact test is used to test soft package batteries, then the safety performance can be evaluated, but the battery is severely damaged or broken directly which does not reflect actual use conditions
Solution Approach 1:
The patent changes the test parameters from high-velocity impact to controlled compression force and duration. By adjusting the mechanical stress parameters (force magnitude, application time, and distribution), the test evaluates safety performance while avoiding catastrophic battery failure, thus resolving the contradiction between reliable safety assessment and excessive damage.
2Measurement precision
If a completely crushed state of battery is tested, then the worst condition can be determined, but this state almost never occurs during actual use
Solution Approach 1:
The patent applies partial compression (not complete crushing) with controlled force and duration to simulate realistic damage scenarios. This partial action approach determines safety thresholds while maintaining relevance to actual usage conditions, resolving the contradiction between precise safety measurement and practical adaptability.
3Productivity
If traditional impact test methods are used, then safety testing can be performed, but they fail to identify defects that could lead to short circuits and fires
Solution Approach 1:
The patent applies preliminary controlled compression before failure occurs, allowing detection of early defect signs such as internal short circuits and abnormal heat generation. This preliminary action enables identification of potential safety issues while the battery is still intact, improving both defect detection capability and testing 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
The proposed system effectively evaluates the safety of soft package batteries by simulating mechanical stress, identifying defects that could lead to short circuits and other safety issues, providing a more accurate assessment of battery quality and safety compared to traditional impact tests.
Implementation Method 1
a pressure apparatus disposed above the extrusion apparatus, wherein the pressure apparatus is configured to apply a predetermined force to the battery in predetermined duration through the extrusion apparatus
Data Source
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AI summary
This application relates to a battery test system and a battery test method. The battery test system according to an embodiment comprises: an extrusion apparatus configured to be disposed on a first surface of a battery; and a pressure apparatus, disposed above the extrusion apparatus, where the pressure apparatus is configured to apply a predetermined force to the battery in predetermined duration through the extrusion apparatus. The battery test system and the battery test method provided in this application are able to more reasonably evaluate the safety of the soft package battery and identify the risk caused by the defect of the soft package battery.