Battery Laminate Film Structure to Prevent Terminal Short Circuits
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Solution Overview
Problem
Conventional batteries face issues with short circuits due to excessive load causing the resin layer between the terminal and metal layer in laminate films to flow and contact, leading to electrical shorts during sealing.
Innovation Solution
Incorporating insulating particles into the resin layer between the terminal and metal layer within the laminate film structure to prevent contact and maintain uniform thickness, thereby suppressing short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the resin layer is melted during sealing, then the laminate film is tightly sealed, but the liquid resin may flow and cause short circuit between metal layer and terminal
Solution Approach 1:
An insulating particle layer is introduced as an intermediary between the metal layer and the resin layer. This insulating layer prevents direct contact between the metal layer and terminal even when resin flows during sealing, thereby eliminating the short circuit risk while maintaining effective sealing.
Solution Approach 2:
The laminate film is designed as a composite structure combining metal layer, resin layer, and insulating particle layer. This composite structure leverages the sealing capability of resin while the insulating particles provide electrical isolation, preventing short circuits between metal layer and terminal.
2Ease of manufacture
If excessive load is applied to the laminate film, then sealing is achieved, but the resin layer deforms and flows causing short circuit
Solution Approach 1:
The insulating particle layer is placed beforehand between the metal layer and resin layer to cushion against excessive load during sealing. This pre-positioned protective layer prevents resin from flowing directly onto the metal layer, maintaining thickness uniformity and preventing short circuits even under excessive loading conditions.
3Shape
If the resin layer is made thinner for better folding properties, then flexibility improves, but short circuit risk increases due to reduced insulation
Solution Approach 1:
The insulation mechanism is changed from relying on resin layer thickness to relying on insulating particles. This parameter change allows the resin layer to be made thinner for better folding properties while the insulating particles maintain adequate electrical insulation, preventing short circuits between metal layer and terminal.
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 inclusion of insulating particles effectively prevents short circuits and ensures uniform thickness, enhancing the structural integrity and folding properties of the battery laminate film.
Implementation Method 1
a resin layer that is interposed between the terminal and the metal layer, wherein the resin layer includes insulating particles
Implementation Method 2
a laminate film that includes at least a metal layer and that covers an entire surface of the electrode body and a surface of a portion of the terminal
Data Source
AI summary
A battery including: an electrode body; a terminal that is electrically connected to the electrode body; a laminate film that covers an entire surface of the electrode body and a surface of a portion of the terminal, and that includes at least a metal layer; and a fusing resin layer, serving as a resin layer, which is interposed between the terminal and the metal layer, the fusing resin layer including insulating particles.