Fiber Block Layer Prevents Arc in Rechargeable Battery
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Solution Overview
Problem
Rechargeable batteries face safety issues due to the generation of arcs and potential ignition when conductive foreign materials penetrate the battery, causing short-circuits and increased internal temperatures.
Innovation Solution
Incorporating a block layer made of high-tensile strength fiber materials, such as aramid or carbon fibers, between the electrode assembly and the case, and between the conductive plate and the case, to prevent direct contact and arc generation, while also providing high heat resistance to prevent melting and further safety hazards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional battery structure without a block layer is used, then the device complexity is reduced, but safety deteriorates due to arc generation and ignition risks when conductive foreign materials penetrate
Solution Approach 1:
A block layer made of fiber material is introduced as an intermediary component between the electrode assembly and the case. This block layer serves as a physical barrier that prevents direct contact between conductive foreign materials and the electrode assembly, thereby preventing arc generation and ignition without fundamentally redesigning the battery structure.
Solution Approach 2:
The block layer is constructed from fiber materials that combine high tensile strength and high melting point properties. These composite material characteristics enable the block layer to withstand mechanical penetration forces and high temperatures simultaneously, providing both structural integrity and thermal protection.
2Object-affected harmful factors
If a block layer with high tensile strength and high melting point is added, then safety against penetration and heat resistance is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The block layer is designed as a thin film or sheet structure made of fiber material, which can be easily manufactured and integrated into the battery assembly. This thin film approach provides adequate protection while minimizing manufacturing complexity compared to bulk material solutions.
3Ease of manufacture
If no block layer is present, then the manufacturing process is simpler, but harmful effects from conductive foreign material penetration such as arcs and ignition occur
Solution Approach 1:
The block layer is pre-installed between the electrode assembly and the case before final battery assembly. This preliminary protective measure is in place before any potential penetration can occur, proactively preventing arc generation and ignition rather than reacting to harmful effects after they occur.
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 use of fiber block layers effectively reduces and prevents arc generation, thereby enhancing the safety of rechargeable batteries by preventing ignition and explosion even when conductive foreign materials penetrate, as demonstrated in tests with lithium secondary batteries.
Implementation Method 1
The block layer may have a tensile strength of about 1 Gpa to about 5 Gpa
Implementation Method 2
A melting point of the block layer may be about 150° C. to about 450° C.
Data Source
AI summary
A rechargeable battery includes an electrode assembly including a first electrode and a second electrode; a case receiving the electrode assembly; and at least one block layer between the case and the electrode assembly, wherein the block layer is made of a fiber material.