Perforated Battery Separator With Magnetic Trigger for Internal Shorting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for evaluating the safety of lithium secondary batteries during internal short circuits often require physical changes to the battery structure, which do not accurately simulate real-world conditions.
Innovation Solution
A battery cell design featuring a separator with a perforated line and a magnetic body, where the magnetic body is arranged adjacent to the perforated line without overlapping, allowing for the induction of an internal short circuit through rotational stress without altering the battery's structure, using a magnet to break the perforated line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If physical changes are made to the battery structure to induce internal short circuit, then internal short circuit can be induced, but the separator is deformed and does not represent actual use environment
Solution Approach 1:
A perforated line is pre-formed in the separator during manufacturing, and a magnetic body is pre-positioned adjacent to it. This preliminary preparation allows the separator to maintain its original structure during normal use while enabling controlled short circuit induction later through magnetic interaction alone, without physical deformation of the separator.
Solution Approach 2:
The invention replaces mechanical methods of inducing short circuits (such as physical tearing, chemical dissolution, or structural modification) with a magnetic field-based approach. An external magnet interacts with the magnetic body in the separator, generating magnetic force that directly bridges the perforated line to induce short circuit without mechanical contact or deformation of the separator structure.
2Temperature
If heating element is inserted to induce internal short circuit, then internal heat can be generated, but the battery structure is physically altered
Solution Approach 1:
The invention removes the need for heating elements or other thermal induction devices from the battery structure. By extracting the physical modification requirement and replacing it with magnetic field interaction, the system can generate internal heat through short circuit without inserting additional components that would alter the battery structure.
3Reliability
If separator is treated with chemicals to dissolve at certain temperature, then internal short circuit can be induced, but the separator properties are changed from original state
Solution Approach 1:
The invention replaces chemical dissolution methods with magnetic field interaction. Instead of using chemicals that alter the separator's composition and properties, an external magnetic field interacts with the magnetic body to induce short circuit, preserving the separator's original chemical composition and physical properties throughout the testing process.
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
This method effectively simulates an internal short circuit within the battery cell without physical alteration, enabling a reliable safety evaluation during charge/discharge cycles.
Implementation Method 1
a magnetic body which is formed in a region adjacent to the perforated line and does not overlap, and is arranged continuously or discontinuously at a position spaced apart from each other along the perforated line
Data Source
AI summary
The present invention relates to a battery cell comprising a separator in which a perforated line and magnetic bodies adjacent to the perforated line are formed, and a method for evaluating battery cell safety by using same, wherein the battery cell can induce an internal short circuit without physical deformation of the cell structure, and can be effectively applied to evaluation of battery cell safety against an internal short circuit.