Battery Cell Structure for Internal Short Circuit Evaluation
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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 coated and non-coated regions, sub-separators, and short circuit electrodes, allowing for the induction and evaluation of internal short circuits by removing sub-separators during charging or discharging, facilitating the simulation of lithium precipitation and heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sub-separators are added to cover non-coated regions, then internal short circuit is prevented, but device complexity increases
Solution Approach 1:
The separator is divided into two functional parts: a main separator covering coated regions and sub-separators covering non-coated regions. This segmentation allows each part to perform its specific function independently, preventing internal short circuits in non-coated regions while maintaining the overall simplicity of the battery structure.
Solution Approach 2:
Different regions of the battery are provided with different separator configurations tailored to their specific needs. Non-coated regions receive sub-separators for short circuit prevention, while coated regions rely on the main separator. This local differentiation optimizes safety without unnecessarily complicating the entire separator system.
2Adaptability or versatility
If non-coated part regions are created for short circuit electrode placement, then internal short circuit evaluation is enabled, but manufacturing precision requirements increase
Solution Approach 1:
Non-coated part regions are deliberately created during the electrode manufacturing process in preparation for subsequent short circuit evaluation. By pre-defining these regions, the system enables easy placement of short circuit electrodes and sub-separators without requiring high-precision coating across the entire electrode surface.
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 easy induction and effective evaluation of internal short circuits, allowing for the assessment of heating properties and safety in lithium secondary batteries, thereby enhancing safety protocols.
Implementation Method 1
simulation of lithium precipitation and heat generation
Implementation Method 2
heat and gas are generated as active materials or electrolytes, which are components of the battery cell, cause a decomposition reaction
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.