Battery Separator Opening Design for Consistent Internal Short Circuits
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Solution Overview
Problem
Existing methods for inducing internal short circuits in batteries, such as lithium secondary batteries, lack consistency and accuracy, leading to unreliable safety evaluations due to non-uniform resistance changes and potential side reactions, which can compromise the integrity of the battery's performance and safety testing.
Innovation Solution
An internal short circuit induction apparatus and method using a separator cover with controlled openings and conductive materials to induce consistent short circuits by accurately simulating the short circuit conditions, allowing for precise evaluation of battery safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods (heating elements, chemical treatment, mechanical pressing) are used to induce internal short circuits, then short circuit induction can be achieved, but the resistance changes are non-uniform and side reactions occur, leading to inconsistent test results
Solution Approach 1:
The separator is pre-formed with openings of controlled size and shape before battery assembly. This preliminary preparation ensures that when the conductive material is introduced, it creates uniform resistance changes without the need for post-assembly chemical treatment or mechanical deformation, thereby achieving consistent short circuit induction across multiple batteries.
Solution Approach 2:
Openings are created at specific locations on the separator where conductive material will be introduced. This localized preparation allows precise control over where short circuits occur and ensures uniform resistance changes only in the intended areas, preventing unwanted side reactions in other parts of the battery.
2Object-generated harmful factors
If heating elements or chemical treatments are used to induce internal short circuits, then short circuit effects can be generated, but the battery structure is altered and side reactions occur, compromising test accuracy
Solution Approach 1:
A conductive material is introduced as an intermediary substance through the pre-formed openings in the separator. This conductive material serves as a controlled mediator that creates the desired short circuit effect without requiring heating elements or chemical treatments that would alter the battery structure or cause unwanted side reactions.
Solution Approach 2:
The invention creates a simplified model of internal short circuit conditions by using pre-formed openings with conductive material, rather than attempting to replicate complex failure modes through heating or chemical treatment. This copying approach allows accurate simulation of short circuit effects while maintaining battery structural integrity.
3Object-generated harmful factors
If mechanical pressing or separator deformation is used to induce internal short circuits, then short circuit induction is achieved, but the method is complex and difficult to control, leading to variable resistance changes
Solution Approach 1:
The separator is pre-formed with openings during manufacturing, eliminating the need for complex post-assembly mechanical deformation devices. This preliminary preparation simplifies the induction apparatus to basic components for introducing conductive material, while ensuring consistent opening dimensions and positions for reliable short circuit induction.
Solution Approach 2:
The invention controls the physical parameters of the separator openings (size, shape, position) during manufacturing, allowing precise control over the subsequent short circuit characteristics. This parameter control replaces complex mechanical deformation processes with simple, repeatable manufacturing steps that are easy to control and reproduce.
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 accurate simulation of internal short circuits with controlled resistance, ensuring reliable safety evaluations and stability assessments of batteries under actual operating conditions, without altering the battery's structure or performance.
Implementation Method 1
the opening is filled with a conductive material
Implementation Method 2
a separator cover configured to cover an opening of a separator
Data Source
AI summary
An internal short circuit induction apparatus for a battery. The internal short circuit induction apparatus includes an electrode assembly including a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode. The apparatus further includes a pressing unit movably located above the electrode assembly, a support unit located under the electrode assembly, the support unit being fixed at a position and configured to support the electrode assembly, and a pulling unit configured to pull a separator cover to remove the separator cover from the electrode assembly. The separator includes an opening.