Electrode Assembly Heat Radiation Tape for Tab Hotspots
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Solution Overview
Problem
Rechargeable batteries face issues with heat generation and temperature deviation due to localized heat concentration at the electrode tabs, leading to performance deterioration and potential loosening of the electrode assembly.
Innovation Solution
A heat radiation tape with a heat diffusion layer, comprising graphite or metal foil, is applied to the external circumferential surface of the electrode assembly to rapidly dissipate heat and maintain the assembly's shape, reducing temperature deviation and preventing loosening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the resistance is lowered and the capacity is increased to implement high power and high-capacity model, then the battery capacity and power are improved, but heat generation at the electrode tab increases due to larger current applied for longer time
Solution Approach 1:
A heat radiation tape is introduced as an intermediary component between the electrode tab and the external environment. This tape contains heat radiation particles that absorb excess heat from the electrode tab and radiate it away, preventing heat accumulation while allowing the battery to operate at high capacity and power levels
Solution Approach 2:
The thermal properties of the electrode tab region are changed by applying a heat radiation tape with specific thermal conductivity and heat radiation characteristics. This modifies the heat dissipation parameters in the critical area without changing the battery's electrical capacity or power output parameters
2Temperature
If heat is concentrated on the electrode tab, then the local temperature increases, but temperature deviation inside the battery cell occurs leading to balance deterioration
Solution Approach 1:
Instead of uniformly treating the entire battery structure, the heat radiation tape is specifically applied to the electrode tab region where heat concentration occurs. This localized treatment addresses the temperature imbalance problem at the critical heat-generating area without affecting other parts of the battery
Solution Approach 2:
The heat radiation tape acts as a thermal intermediary that redistributes heat from the concentrated electrode tab area to surrounding regions, reducing the temperature gradient and promoting thermal balance across the battery cell
3Reliability
If protective tape is attached to the electrode tab and outermost surface, then the electrode tab is protected, but the shape of the wound electrode assembly may be loosened by internal stress
Solution Approach 1:
The heat radiation tape is constructed as a composite material structure combining adhesive layer, heat radiation particle layer, and support layer. This composite structure provides both protective adhesion to the electrode tab and mechanical reinforcement to maintain the wound assembly's shape against internal stresses
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 heat radiation tape effectively diffuses heat, minimizing temperature imbalance and maintaining the electrode assembly's shape, thereby preventing performance deterioration and electrode damage.
Implementation Method 1
a heat radiation tape disposed on an external circumferential surface of the electrode assembly, wherein the heat radiation tape includes a heat diffusion layer
Data Source
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AI summary
A rechargeable battery according to an exemplary embodiment of the present invention includes: an electrode assembly including a negative electrode sheet, a positive electrode sheet, and a separation membrane; and a heat radiation tape disposed at an external circumferential surface of the electrode assembly, wherein the heat radiation tape includes a heat diffusion layer, and the heat diffusion layer includes at least one of graphite and a metal foil.