Battery Lead Protective Tape With Low-Filler Heat-Resistant Adhesive
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Solution Overview
Problem
Conventional protective tapes for batteries, when penetrated by foreign matter leading to internal short circuits, tend to melt or decompose, causing increased battery temperature and potential long-term reliability issues due to high filler content ratios.
Innovation Solution
A protective tape with a substrate layer and an adhesive layer containing a filler such as a phosphoric acid group-containing compound, boric acid group-containing compound, or silicic acid group-containing compound, which provides improved heat resistance and adhesive properties even with a lower filler content ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the content ratio of filler is increased to improve heat resistance, then the protective tape can suppress temperature increase during internal short circuit, but the adhesive force decreases and long-term reliability deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the filler from conventional metal oxides to compounds containing phosphoric acid groups, boric acid groups, or silicic acid groups. This parameter change enables the filler to provide superior heat resistance at lower content ratios (5-50 wt%) compared to conventional fillers, thereby maintaining adhesive force while achieving the desired temperature suppression effect during internal short circuits
Solution Approach 2:
The patent creates a composite adhesive layer by combining the adhesive resin with specific filler compounds (phosphoric acid group-containing, boric acid group-containing, or silicic acid group-containing compounds). This composite material approach allows the filler to function effectively at lower concentrations, resolving the contradiction between heat resistance and adhesive force by optimizing the synergistic interaction between the adhesive matrix and the functional filler
2Reliability
If the content ratio of filler is decreased to maintain adhesive force, then the protective tape maintains good adhesion, but the heat resistance is insufficient and the protective tape may melt or decompose during internal short circuit
Solution Approach 1:
The patent modifies the chemical structure parameters of the filler to include phosphoric acid groups, boric acid groups, or silicic acid groups, which possess inherent flame-retardant and heat-resistant properties. This parameter change allows the filler to provide adequate heat resistance even at low content ratios (5-50 wt%), preventing the protective tape from melting or decomposing during internal short circuits while maintaining adhesive force
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 proposed solution effectively suppresses the increase in battery temperature during internal short circuits, maintains long-term reliability by preventing peeling of the protective tape, and achieves equal or higher heat resistance with a lower filler content compared to conventional metal oxide fillers.
Implementation Method 1
the adhesive layer has an adhesive and a filler including at least one of the group consisting of a phosphoric acid group-containing compound, a boric acid group-containing compound, and a silicic acid group-containing compound
Data Source
AI summary
A battery includes a positive electrode, a negative electrode, a positive electrode lead which is connected to the positive electrode, and a protective tape which covers the positive electrode lead. The protective tape includes a base material layer and an adhesive layer that is arranged on the base material layer; and the adhesive layer contains an adhesive material and a filler which contains at least one compound that is selected from among phosphoric acid group-containing compounds, boric acid group-containing compounds and silicic acid group-containing compounds.