Multilayer Tab Tape with Endothermic Reactive Material
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Solution Overview
Problem
In lithium ion secondary batteries, the tab tape covering electrode tabs can melt or decompose when high currents flow, leading to loss of insulation and potential internal short circuits between the positive and negative electrodes.
Innovation Solution
A multilayer tab tape structure with an adhesive layer containing a reactive material that generates an endothermic reaction at a temperature lower than the heat resistance temperature of the organic substrate layer, preventing melting or decomposition of the tab tape even when high currents flow through the electrode tabs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-layer organic tab tape is used to cover the electrode tab, then the insulation is provided under normal conditions, but the tab tape melts or decomposes when high current flows and temperature increases
Solution Approach 1:
The patent applies composite materials by creating a multilayer tab tape structure consisting of an organic material layer and an inorganic material layer. The organic layer provides insulation under normal conditions, while the inorganic layer (such as aluminum oxide or aluminum hydroxide) provides heat resistance and structural stability at high temperatures, preventing melting and decomposition of the entire tab tape structure.
Solution Approach 2:
The patent changes the physical and chemical parameters of the tab tape by introducing an inorganic material layer with higher thermal stability. This layer maintains its structural integrity at temperatures where the organic layer would otherwise fail, thereby changing the overall temperature parameter range in which the tab tape can operate reliably.
2Reliability
If the tab tape is made from organic material, then it provides good insulation properties, but it melts or decomposes at high temperatures causing loss of insulation
Solution Approach 1:
The patent combines organic and inorganic materials in a multilayer structure where the organic layer provides excellent insulation properties under normal operating conditions, while the inorganic layer (such as aluminum oxide coating) provides thermal stability and prevents melting or decomposition even when exposed to high temperatures from large currents.
3Reliability
If a multilayer structure with reactive material is used in the adhesive layer, then melting and decomposition are suppressed through endothermic reaction, but the device complexity increases
Solution Approach 1:
The patent incorporates a reactive material layer within the multilayer adhesive structure that undergoes endothermic decomposition reactions (such as calcium carbonate decomposing to calcium oxide and CO2, or aluminum hydroxide decomposing to aluminum oxide and water vapor). This absorbs excess heat and prevents the tab tape from reaching melting temperatures, while the overall structure remains integrated and manufacturable.
4Temperature
If the adhesive layer contains reactive material for endothermic reaction, then the endothermic reaction absorbs heat to prevent melting, but the manufacturing complexity increases
Solution Approach 1:
The patent integrates reactive materials (such as calcium carbonate, aluminum hydroxide, or magnesium hydroxide) into the adhesive layer composition. These materials are mixed with the adhesive binder to form a homogeneous composite adhesive that can be applied using standard lamination processes, making the manufacturing process relatively simple despite the enhanced thermal functionality.
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 solution effectively suppresses the melting or decomposition of the tab tape, maintaining insulation and preventing internal short circuits between the positive and negative electrodes, even under high temperature conditions.
Implementation Method 1
the adhesive layer contains an adhesive material and a reactive material which generates an endothermic reaction at a temperature lower than a heat resistance temperature of the organic material
Data Source
AI summary
A battery according to an aspect of the present disclosure includes: a positive electrode, a negative electrode, a positive electrode tab electrically connected to the positive electrode; a negative electrode tab electrically connected to the negative electrode; a positive electrode tab tape covering the positive electrode tab: and a negative electrode tab tape covering the negative electrode tab. In the battery described above, at least one tab tape of the positive electrode tab tape and the negative electrode tab tape has a multilayer structure in which an adhesive layer and a substrate layer primarily formed from an organic material are laminated in this order from an electrode tab side, and the adhesive layer contains an adhesive material and a reactive material which generates an endothermic reaction at a temperature lower than a heat resistance temperature of the organic material.