Separator-Zoned Battery Cell for Internal Short Circuit Testing
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Solution Overview
Problem
Lithium secondary batteries face safety concerns due to the risk of ignition or explosion from internal short circuits, necessitating effective evaluation methods to simulate and assess such conditions.
Innovation Solution
A battery cell design and method that includes specific electrode and separator configurations, such as porous metal foils and sub-separators, to easily induce and evaluate internal short circuits, allowing for the simulation of lithium precipitation and heat generation, enabling safe assessment of internal short circuit scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional battery cell structure is used, then normal battery operation is maintained, but internal short circuit cannot be easily induced for evaluation purposes
Solution Approach 1:
The separator is divided into multiple regions: a first separator region with normal structure and a second separator region with through-holes formed therein. This segmentation allows the battery to maintain normal operation in most areas while creating specific zones where internal short circuits can be easily induced for evaluation purposes.
Solution Approach 2:
The second separator region is designed with through-holes to create a localized area with different properties from the rest of the separator. This local modification enables internal short circuit induction only in specific regions, allowing safety evaluation without compromising the overall battery structure and normal operation.
2Reliability
If internal short circuit is induced in conventional battery, then safety evaluation can be performed, but it requires complex modification of battery structure
Solution Approach 1:
Instead of modifying the entire separator structure, only a partial region (the second separator region) is modified with through-holes. This partial action approach enables internal short circuit evaluation while maintaining the simplicity and integrity of the rest of the battery structure.
Solution Approach 2:
The invention creates a simplified model of internal short circuit conditions by forming through-holes in a specific separator region, which copies the essential features of internal short circuit scenarios without requiring complex structural modifications or dangerous testing 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
Enables the easy induction and effective evaluation of internal short circuits in battery cells, enhancing safety by simulating conditions that lead to lithium precipitation and heat generation, thus improving the assessment of potential hazards.
Implementation Method 1
simulation of lithium precipitation and heat generation
Implementation Method 2
simulation of lithium precipitation and heat generation
Data Source
AI summary
The present invention relates to a battery cell for evaluating an internal short circuit, and a method for evaluating using the battery cell, wherein an internal short circuit state of a battery cell can be easily induced and, at the same time, an effective internal short circuit evaluation is possible, and the battery cell comprising: first and second electrodes which comprise a coated region on which an electrode mixture layer is coated on a metal current collector and a non-coated region on which an electrode mixture layer is not coated, and which comprise first and second electrode tabs which protrude in one direction from the coated region and do not have an electrode mixture layer coated thereon.