Ceramic-Filled Battery Terminal Gasket for Thermal Runaway Insulation
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Solution Overview
Problem
Conventional gaskets made of polymer materials decompose under high temperature and pressure during battery cell ignition and explosion, losing their insulating function and failing to prevent short circuits.
Innovation Solution
A gasket comprising a ceramic filler that is sinterable under predetermined temperature and pressure conditions, forming a ceramic filler network to maintain insulating function and prevent short circuits even after explosion, combined with a polymer component for enhanced durability and ease of assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polymer gasket is used to prevent short circuits, then the gasket provides insulating function under normal conditions, but the gasket decomposes under high temperature and pressure during cell ignition and explosion, losing its insulating function
Solution Approach 1:
The patent applies composite materials by combining polymer base material with ceramic filler particles. The ceramic filler (such as alumina, silica, or boron oxide) provides high-temperature stability and maintains insulating properties even when the polymer matrix decomposes under thermal stress. This composite structure resolves the contradiction between normal insulating function and high-temperature resistance.
Solution Approach 2:
The patent changes the material parameters of the gasket by incorporating ceramic fillers with specific properties (high melting point, electrical insulation). This parameter change enables the gasket to maintain its insulating function across a wider temperature range, particularly during thermal runaway events when temperatures exceed the decomposition point of conventional polymers.
2Ease of operation
If a polymer gasket is used for ease of assembly, then the gasket is easy to install and provides insulating function, but the gasket fails to prevent short circuits after battery cell explosion due to decomposition
Solution Approach 1:
The composite structure of polymer matrix with ceramic filler maintains the ease of assembly (polymer can be molded and installed like conventional gaskets) while adding short-circuit prevention capability (ceramic filler maintains insulating properties after decomposition). This resolves the contradiction between ease of operation and reliability.
Solution Approach 2:
The ceramic filler is pre-incorporated into the polymer gasket to provide preliminary protection against thermal decomposition. This preliminary anti-action ensures that even before the polymer decomposes, the ceramic network begins to provide thermal stability, and after decomposition, the ceramic skeleton maintains the insulating function to prevent short circuits.
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 gasket effectively maintains insulating properties and prevents short circuits in high temperature and pressure environments by forming a ceramic filler network, ensuring safety and reliability of battery cells.
Implementation Method 1
the ceramic filler may be configured to be sinterable under conditions of a predetermined temperature and a predetermined pressure
Data Source
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AI summary
A battery cell according to an embodiment of the present disclosure includes an electrode assembly, a battery housing configured to accommodate the electrode assembly through an opening provided on one side, a terminal configured to be electrically connected to the electrode assembly through a closed portion provided on an opposite side of the opening of the battery housing, and a gasket interposed between the terminal and the battery housing, configured to prevent electrical connection between the terminal and the battery housing, and including a ceramic filler.